Summary of the invention
The main purpose of the present invention is to provide a kind of screw compressor, air conditioner and screw compressor backpressure regulation sidesMethod is big to solve Pressure in Back-pressure Cavity fluctuation when the back pressure cavity of screw compressor in the prior art is connected to the compression chamber resting periodThe problem of.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of screw compressor, comprising: shell；Mounting bracket, the mounting bracket are fixedly mounted on the enclosure interior；Fixed scroll, the fixed scroll are mounted on the peaceIt fills on bracket；Orbiter, the orbiter are installed in rotation between the mounting bracket and the fixed scroll, instituteStating has compression chamber between orbiter and the fixed scroll, have middle pressure between the orbiter and the mounting bracketLow pressure air suction chamber is all had at the top of chamber, the bottom of the mounting bracket and the fixed scroll；First interface channel, it is describedThe both ends of first interface channel are connected to the compression chamber and medium pressure chamber respectively, and is provided on first interface channelOne control valve；Second interface channel, the both ends of second interface channel respectively with medium pressure chamber and the low pressure air suction chamberIt is connected to, is provided with the second control valve on second interface channel.
Further, first interface channel is arranged on the orbiter.
Further, the institute in the mounting bracket and with the mounting bracket bottom is arranged in second interface channelState the connection of low pressure air suction chamber.
Further, second interface channel extend along the mounting bracket and the fixed scroll and with the quiet whirlpoolLow pressure air suction chamber connection at the top of capstan.
Further, first control valve is the first one way stop peturn valve, the circulating direction of first one way stop peturn valveFor from the compression chamber to medium pressure chamber.
Further, second control valve is the second one way stop peturn valve, the circulating direction of second one way stop peturn valveFor from medium pressure chamber to the low pressure air suction chamber.
Further, first interface channel and second interface channel include non-return valve seat mounting portion, middle pressureChamber side intercommunicating pore, sealing circular conical surface and compression chamber side intercommunicating pore, the sealing circular conical surface are located at the non-return valve seat mounting portionBore ends are connected to close to medium pressure chamber side, compression chamber side intercommunicating pore is positioned at the recessed of the non-return valve seat mounting portion side wallSlot；First control valve and second control valve include the first valve seat, elastomeric element and seal member, the sealingComponent is mounted at the sealing circular conical surface, and first valve seat is mounted in the non-return valve seat mounting portion, the elastic portionIt is supported between first valve seat and the seal member respectively at the both ends of part.
Further, first interface channel includes non-return valve seat mounting hole and middle pressure chamber intercommunicating pore；First controlValve processed includes diaphragm seal and the second valve seat, and the diaphragm seal is located at the bottom of second valve seat, is arranged on second valve seatThere is through-hole.
Further, second valve seat includes ontology and the outward flange that the body peripheral is arranged in, the diaphragm sealPositioned at the inside of the outward flange, the through-hole is provided on the ontology.
Further, second control valve is flap valve piece one way stop peturn valve.
According to another aspect of the present invention, a kind of air conditioner, including screw compressor are provided, the screw compressor isAbove-mentioned screw compressor.
In accordance with a further aspect of the present invention, a kind of backpressure regulation method of screw compressor, the scroll compression are providedThe backpressure regulation method of machine realizes that the backpressure regulation method of the screw compressor includes: to work as using above-mentioned screw compressorWhen pressure Pb in middle pressure chamber is higher than the pressure Ps predetermined value of low pressure air suction chamber, the first control valve on the first interface channel is openedIt opens, prevents fluid countercurrent current to the compression chamber in middle pressure chamber from causing the pressure oscillation in middle pressure chamber and compression chamber, make in middle pressure chamberPressure maximum, which can be stablized, is being connected to a certain pressure Pb before terminating with compression chamber, passes through the first control valve, the second control valve, compressionThe lower realization of common adjusting control of the preload resistance △ P of cavity pressure Pm, low pressure air suction cavity pressure Ps and the second control valve is followingControl: (1) in pressure cavity pressure Pb be greater than low pressure air suction chamber pressure Ps and the second control valve preload resistance △ P when, i.e. Pb >(Ps+ △ P), the second control valve of control are opened, and fluid leaks to low pressure air suction chamber in middle pressure chamber, finally makes the pressure in middle pressure chamberIt is stably maintained at Ps+ △ P；(2) tight resistance pressure cavity pressure Pb pre- lower than the pressure Ps of low pressure air suction chamber and the second control valve inWhen power △ P, i.e. Pb < (Ps+ △ P), the second control valve of control is closed, so that the pressure in middle pressure chamber maintains Pb level.
It applies the technical scheme of the present invention, compared with prior art, middle pressure chamber pressure of the invention is lower, but remains to normalSealing.Reason is existing middle pressure technology under high pressure ratio operating condition, and since pressure of inspiration(Pi) is smaller, compression chamber is under-voltage, and contracting is serious,Middle pressure chamber is connected to angle with compression chamber and needs to realize sealing closer to exhaust angle to improve middle pressure chamber pressure, therefore, is ensuringHeight is than the sealing under this kind of low-temperature heating operating condition, since connection angle is close to row under rated designs operating condition and High Pressure Difference operating conditionAir cavity makes middle pressure chamber pressure bigger than normal, seals that surplus is too big when so as to cause under this kind of operating condition and to bring friction power loss big etc. unfavorableFactor.And the screw compressor of the invention patent is used then can effectively to let out under the excessive operating condition of the pressure of this kind of middle pressure chamberPressure, pressure release cause under safer and more effective pressure.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention showsExamples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the partial sectional view of the first embodiment of screw compressor of the invention；
Fig. 2 diagrammatically illustrates the partial sectional view of the second embodiment of screw compressor of the invention；
Fig. 3 diagrammatically illustrates the cross-sectional view of the 3rd embodiment of screw compressor of the invention；
Fig. 4 diagrammatically illustrates the partial sectional view of the fourth embodiment of screw compressor of the invention；
Fig. 5 diagrammatically illustrates the partial sectional view of the 5th embodiment of screw compressor of the invention；
Fig. 6 diagrammatically illustrates the partial sectional view of the sixth embodiment of screw compressor of the invention；
Fig. 7 diagrammatically illustrates the partial sectional view of the 7th embodiment of screw compressor of the invention；
Fig. 8 diagrammatically illustrates the partial sectional view of the first embodiment of orbiter of the invention；
Broken section when Fig. 9 is diagrammatically illustrated on the orbiter of the first control valve installation of the invention in fig. 8Figure；
Figure 10 diagrammatically illustrates the partial sectional view of the second embodiment of orbiter and the first control valve of the invention；
Figure 11 diagrammatically illustrates the partial sectional view of mounting bracket of the invention；
Figure 12 diagrammatically illustrates the first perspective view of the second valve seat of the invention；
Figure 13 diagrammatically illustrates the second perspective view of the second valve seat of the invention；
Figure 14 diagrammatically illustrates the application effect comparison diagram of screw compressor and existing screw compressor of the invention；
Figure 15 diagrammatically illustrates the compression chamber pressure change of existing screw compressor and the relational graph of crank angle；
Figure 16 diagrammatically illustrates the pressure in screw compressor of the invention and existing screw compressor use process and becomesChange figure.
Wherein, the above drawings include the following reference numerals:
10, shell；11, upper cover；12, casing；20, mounting bracket；30, fixed scroll；40, orbiter；50, first connectsConnect road；51, non-return valve seat mounting hole；52, middle pressure chamber intercommunicating pore；60, the second interface channel；561, non-return valve seat mounting portion；562, middle pressure chamber side intercommunicating pore；563, circular conical surface is sealed；564, compression chamber side intercommunicating pore；70, the first control valve；71, diaphragm seal；72, the second valve seat；721, through-hole；722, ontology；723, outward flange；80, the second control valve；781, the first valve seat；782, elasticComponent；783, seal member；90, compression chamber；100, middle pressure chamber；110, low pressure air suction chamber；120, crankshaft；130, driving motor；140, supplementary bearing；150, main balance weight；160, sealing gland seal；170, base bearing；180, eccentric bushing；190, bearing is driven；200,Discharge chamber.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phaseMutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted rootAccording to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singularAlso it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packetInclude " when, indicate existing characteristics, step, operation, device, component and/or their combination.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top "," ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spyThe spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figureExcept different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devicesIt will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), andAnd respective explanations are made to the opposite description in space used herein above.
Referring to shown in Fig. 1 to Figure 16, according to an embodiment of the invention, a kind of screw compressor is provided, in the present embodimentScrew compressor include shell 10, it is fixed scroll 30, discharge chamber 200, compression chamber 90, orbiter 40, mounting bracket 20, lowPress suction chamber 110, crankshaft 120, driving motor 130, supplementary bearing 140, main balance weight 150, sealing gland seal 160, base bearing 170,Middle pressure chamber 100, eccentric bushing 180, driving bearing 190, the first interface channel 50 and the second interface channel 60.
Wherein, shell 10 includes the upper cover 11 that casing 12 and lid are located on casing 12.It is when installation, mounting bracket 20 is fixedIt is mounted on inside shell 10；Fixed scroll 30 is mounted in mounting bracket 20；Orbiter 40 is installed in rotation on installation branchBetween frame 20 and fixed scroll 30, there is compression chamber 90, orbiter 40 and installation between orbiter 40 and fixed scroll 30There is middle pressure chamber 100, the bottom of mounting bracket 20 and the top of fixed scroll 30 all have low pressure air suction chamber between bracket 20110；The both ends of first interface channel 50 are connected to compression chamber 90 and middle pressure chamber 100 respectively, are provided on the first interface channel 50First control valve 70；Company's section of second interface channel 60 is connected to middle pressure chamber 100 and low pressure air suction chamber 110 respectively, the second connectionThe second control valve 80 is provided on channel 60.
Screw compressor of the invention especially Horizontal type vehicle-mounted scroll compressor structure, but feature of the present invention is stillIt can be advantageously applied in traditional vertical enthalpy-increasing scroll compressor.
Shown in Figure 3, driving motor 130 is built in casing 12, and driving motor 130 drives crankshaft 120 to rotate, crankshaft120 carry out circumferential direction and radial constraint by supplementary bearing 140 and base bearing 170, guarantee the concentricity of screw compressor shafting, crankshaft120 driving ends drive orbiter 40 to do revolution around fixed scroll 30 and move back and forth by flexible eccentric bushing 180.Then by quiet whirlpoolPeriodically increasing, which occurs, in the minimum cylinder volume that capstan 30 and orbiter 40 are constituted to be reduced, and the compression chamber 90 of compression refrigerant is formed,To complete continuously to the refrigerant compression being inhaled into compression chamber.
Screw compressor of the invention also has structure feature as shown in Figure 1: screw compressor of the present invention40 floating seal of orbiter of axial seal mode between the pump housing, i.e., at the back side of orbiter 40 (relative to quiet vortexDisk) the axial gas power that middle pressure chamber 100 is used to resist the generation of 40 front compression chamber 90 of orbiter is formed, then, in dynamic vortexThe tow sides of disk 40 form contrary axial gas pressure, the pressure in middle pressure chamber 100 be in pressure at expulsion Pd andIntermediate pressure Pb between pressure of inspiration(Pi) Ps, the pressure Pm in compression chamber 90 are the pressure that center constantly becomes larger from the outer Zhou Dynasty.It is dynamicOrbiter 40 is tightly fitted on fixed scroll 30 by the pressure that 40 tow sides of scroll plate generate, and is realized axial between the pump housingSealing.
As shown in Figure 1, in order to obtain the steady pressure in middle pressure chamber 100.The present invention compression chamber 90 and middle pressure chamber 100 itBetween the first interface channel 50 is set, by compression chamber 90 pressure introduce middle pressure chamber 100, as illustrated by the arrows in fig. 1, and at thisFirst control valve 70 is set on first interface channel 50, gas is only allowed to flow into middle pressure chamber 100 from compression chamber 90, first controlThe effect of valve 70 is so that the pressure oscillation in middle pressure chamber 100 is small, the final pressure stablized in a certain compression chamber 90.
As shown in figure 15, in which: θ 1, middle pressure chamber are connected to opening angle with compression chamber；θ 2, middle pressure chamber are connected to closing with compression chamberAngle；P1, middle pressure chamber are connected to unlatching compression cavity pressure with compression chamber；P2, middle pressure chamber are connected to closing compression cavity pressure with compression chamber；θ,Drive crank angle；P, cavity pressure is compressed.Y-coordinate is the pressure P in compression chamber 90 in figure, and X-axis is the corner of crankshaft 120, is usedIn the connection angle of connection 90 access of compression chamber and middle pressure chamber 100 be θ 1 θ 2, the pressure of corresponding compression chamber 90 is P1 and P2, anyDirectly or indirectly the pressure state of connection compression chamber 90 compression chamber 90 corresponding with the middle pressure scheme of middle pressure chamber 100 is such as Figure 15 instituteShow.It then, is as shown in figure 16 the middle pressure chamber in the use process of existing screw compressor and screw compressor of the inventionPressure variation, in which: Pm, middle pressure chamber pressure；Realize that curve is line of buckling in feature of present invention；Dotted line is the prior artThe middle pressure curve of cyclical fluctuations, P are the pressure of compression chamber 90, the influence of compressed 90 pressure of chamber, in the pressure such as Figure 16 in middle pressure chamber 100It is existing middle pressure scheme, by being directly or indirectly connected to compression chamber 90 and middle pressure chamber 100, corresponding connection angle shown in dotted lineSpend θ 1 under θ 2, the pressure in middle pressure chamber 100 has a cyclic fluctuation, and 100 pressure oscillation of middle pressure chamber will cause sound disk itBetween axis sealing, deficiency may be sealed in middle pressure pressure minimum, between the pump housing and cause to leak, intermediate pressure maximumWhen, between the pump housing may sealing force cause friction power loss too big greatly very much.
Why 100 pressure oscillation of middle pressure chamber in existing screw compressor is big, is because of compression chamber 90 and middle pressure chamber 100When period is connected to, in the case where starting to be connected to angle, θ 1, the pressure in compression chamber 90 is low pressure P1, at this point, the pressure in middle pressure chamber 100Higher than the pressure of compression chamber 90, fluid, which leaks to compression chamber 90 by middle pressure chamber 100, leads to 100 pressure reduction of middle pressure chamber, withThe continuous compression of compression chamber 90, pressure are gradually increasing, and fluid is leaked towards middle pressure chamber 100 when rising above 100 pressure of middle pressure chamber,Then 100 pressure of middle pressure chamber constantly rises, middle pressure chamber 100 be connected to compression chamber 90 terminate before reach maximum, then compression chamber90 are connected to closing with middle pressure chamber 100, subsequently enter next connection period, and the period is back and forth as shown in figure 16.Such as solid line in Figure 16Shown, the pressure for the middle pressure chamber 100 of scroll compression shrinkage cavity of the invention is basically stable at by the effect of the first control valve 70Under the premise of the connection angle and mode of one stationary value, compression chamber 90 and middle pressure chamber 100 are constant, middle pressure chamber 100 is lower in connectionWhen the pressure of compression chamber 90,90 pressure of compression chamber is lower, and 100 pressure of middle pressure chamber is big, but due to the effect of the first control valve 70,There is no middle pressure chambers 100 to leak to compression chamber 90, and the pressure being then able to maintain in middle pressure chamber 100 remains at certain pressureIt is horizontal.
As shown in Figure 1, in the first embodiment of the present invention, the first interface channel 50 is arranged on orbiter 40,And make the second interface channel 60 that mounting bracket 20 be set and be connected to the bottom low pressure air suction chamber 110 of mounting bracket 20.Such asOnly allow fluid to circulate in Fig. 1 from middle pressure chamber 100 to low pressure air suction chamber 110 shown in arrow and there is certain preload resistance, i.e.,Second interface channel 60 only should when the pressure Ps for being higher than low pressure air suction chamber 110 of the pressure Pb in middle pressure chamber 100 is destined toSecond interface channel 60 could be opened, and prevent fluid countercurrent current to the compression chamber 90 in middle pressure chamber 100 from causing middle pressure chamber 100 and compressionPressure oscillation in chamber 90 enables the pressure maximum in middle pressure chamber 100 to stablize and is being connected to a certain pressure before terminating with compression chamber 90Power Pb (Pb is slightly below Pm) then passes through the first control valve 70, the second control valve 80,90 pressure Pm of compression chamber, low pressure air suction chamberUnder the common adjusting control of the preload resistance △ P of 110 pressure Ps and the second control valve 80: 1, when 100 pressure Pb of middle pressure chamber is bigIn low pressure air suction chamber 110 pressure Ps and the second control valve 80 preload resistance △ P when, i.e. Pb > (Ps+ △ P), control second controlValve 80 processed is opened, and fluid leaks to low pressure air suction chamber 110 in middle pressure chamber 100, is finally stablized the pressure in middle pressure chamber 100 and is maintainedAt Ps+ △ P (circulating resistance for ignoring access herein)；2, when 100 pressure Pb of middle pressure chamber is lower than the pressure Ps of low pressure air suction chamber 110When with the preload resistance △ P of the second control valve 80, i.e. Pb < (Ps+ △ P), the second control valve 80 of control is closed, in middle pressure chamber 100Pressure maintain Pb level.
Then, the pressure of the middle pressure chamber 100 in the actual operating mode of entire scroll compressor compresses can be in differentStress level, as shown in figure 14, the region in figure with oblique line indicate the application effect of existing screw compressor, without oblique lineRegion indicate the application effect of screw compressor of the invention, P1 is that compression chamber 90 is connected to pressure；△ P, the second control valve 80Preload resistance, compared with prior art, 100 pressure of middle pressure chamber of the invention is lower, but remains to normally seal.Reason is existingThe middle pressure technology having is under high pressure ratio operating condition, and since pressure of inspiration(Pi) is smaller, compression chamber 90 is under-voltage, and contracting is serious, middle pressure chamber 100 and pressureContracting chamber 90 is connected to angle and needs to realize sealing closer to exhaust angle to improve 100 pressure of middle pressure chamber, therefore, is ensuring height ratioMade due to connection angle close to discharge chamber under sealing under this kind of low-temperature heating operating condition, rated designs operating condition and High Pressure Difference operating conditionMiddle pressure chamber pressure is bigger than normal, seal that surplus is too big when so as to cause under this kind of operating condition and the unfavorable factors such as bring friction power loss big.And use the invention patent screw compressor then can effective pressure release under the excessive operating condition of the pressure of this kind of middle pressure chamber 100,Pressure release causes under safer and more effective pressure.
Preferably, the first control valve 70 in the present embodiment is the first one way stop peturn valve, the stream of first one way stop peturn valveLogical direction is from compression chamber 90 to middle pressure chamber 100.Second control valve 80 is the second one way stop peturn valve, the stream of the second one way stop peturn valveLogical direction is from middle pressure chamber 100 to low pressure air suction chamber 110.
Shown in Figure 2, second embodiment according to the present invention provides a kind of screw compressor, in the present embodimentScrew compressor and first embodiment it is essentially identical, the difference is that the second interface channel 60 in the present embodiment is along installationBracket 20 and fixed scroll 30 extend and are connected to the top low pressure air suction chamber 110 of fixed scroll 30, rather than and mounting bracketThe low pressure air suction chamber 110 of 20 bottom is connected to.As shown in Fig. 2, 30 back side of fixed scroll forms exhaust high pressure chest Pd and low pressure is inhaledAir cavity Ps can use low pressure air suction chamber 110 and middle pressure chamber 100 adjusting at this and form suitable intermediate pressure.Specifically, such asPass through installation branch between low pressure air suction chamber 110 at the top of the structure of Fig. 5 and Fig. 6, compression chamber 90 of the invention and fixed scroll 30Frame 20 is connected to the second interface channel 60 on fixed scroll 30, and the second control valve 80 with non-return characteristic may be provided at quiet whirlpoolIn the second interface channel 60 on capstan 30, as shown in Figure 5.The second interface channel 60 in mounting bracket 20 can be set againIt is interior, as shown in Figure 6.
Shown in Figure 3, the second interface channel 60 of screw compressor is also disposed at mounting bracket 20 and and mounting bracket20 bottom low pressure air suction chamber 110 is connected to.
It is illustrated in figure 4 the partial sectional view of the fourth embodiment of the application, in the present embodiment the first interface channel 50Across the connection compression chamber 90 and middle pressure chamber 100 of orbiter 40, the first control valve is provided on first interface channel 5070, the low pressure air suction of the second interface channel 60 connection middle pressure chamber 100 and 20 bottom of mounting bracket is offered in mounting bracket 20Chamber 110 is provided with the second control valve 80 on second interface channel 60.Referring to shown in Fig. 8 and Fig. 9, in the present invention firstInterface channel 50 includes that non-return valve seat mounting portion 561, middle pressure chamber side intercommunicating pore 562, sealing circular conical surface 563 and compression chamber side connectThrough-hole 564, sealing circular conical surface 563 are located at non-return valve seat mounting portion 561 close to 562 end of middle pressure chamber side intercommunicating pore, compression chamber sideIntercommunicating pore 564 is the groove positioned at 561 side wall of non-return valve seat mounting portion；First control valve 70 includes the first valve seat 781, elastic portionPart 782 and seal member 783, seal member 783 are mounted at sealing circular conical surface 563, and the first valve seat 781 is mounted on check-valvesIn seat mounting portion 561, the both ends of elastomeric element 782 are supported respectively between the first valve seat 781 and seal member 783, and compression is worked asWhen pressure in chamber 90 reaches certain value, seal member 783 opens middle pressure chamber side intercommunicating pore 562, the fluid in compression chamber 90It enters in middle pressure chamber 100.First is controlled by the secure fit between the first valve seat 781 and non-return valve seat mounting portion 561The installation of valve 70 is fixed, and the sealing between access utilizes seal member 783, i.e., seals between steel ball structure and sealing circular conical surface 563,And seal member 783 is fitted on sealing circular conical surface 563 by elastomeric element 782, under normal assembled state, elastomeric element782 press lightly on seal member 783 on sealing circular conical surface 563, the seal preload with very little.In seal member 783When not being fitted on sealing circular conical surface 563, fluid can be connected by middle pressure chamber side intercommunicating pore 562 and compression chamber side intercommunicating pore 564Logical compression chamber 90 and middle pressure chamber 100.
Shown in Figure 10, the first interface channel 50 includes non-return valve seat mounting hole in another embodiment of the invention51 and middle pressure chamber intercommunicating pore 52；First control valve 70 includes diaphragm seal 71 and the second valve seat 72, and diaphragm seal 71 is located at the second valve seat72 bottom is provided with through-hole 721 on the second valve seat 72, and when the pressure in compression chamber 90 reaches certain value, diaphragm seal 71 willThe opening of through-hole 721 is provided on second valve seat 72, the fluid in compression chamber 90 enters in middle pressure chamber 100.Referring to Figure 12 and figureShown in 13, the second valve seat 72 in the present embodiment includes ontology 722 and the outward flange 723 that 722 periphery of ontology is arranged in, installationWhen, diaphragm seal 71 is located at the inside of outward flange 723, and above-mentioned through-hole 721 is provided on ontology 722.Second valve seat 72 is in diaphragm sealWhen 71 opening, fluid can be passed through by diaphragm seal 71 and middle pressure chamber intercommunicating pore 52.
As shown in figure 11, the second interface channel 60 in the present invention also includes non-return valve seat mounting portion 561, middle pressure chamber side companyThrough-hole 562, sealing circular conical surface 563 and compression chamber side intercommunicating pore 564, sealing circular conical surface 563 are located at non-return valve seat mounting portion 561Close to 562 end of middle pressure chamber side intercommunicating pore, compression chamber side intercommunicating pore 564 is the groove positioned at 561 side wall of non-return valve seat mounting portion；Second control valve 80 includes the first valve seat 781, elastomeric element 782 and seal member 783, and seal member 783 is mounted on sealingAt circular conical surface 563, the first valve seat 781 is mounted in non-return valve seat mounting portion 561, and the both ends of elastomeric element 782 are supported respectivelyBetween first valve seat 781 and seal member 783.By in mounting bracket 20 the second interface channel of the company of opening up 60 for be connected to peaceOutside in bracket 20 is filled, is provided with the second control valve 80, the middle pressure chamber 100 in mounting bracket 20 on the second interface channel 60Fluid can only flow to the low pressure air suction chamber 110 outside mounting bracket 20.Compared to the first one way stop peturn valve, the second reverse check valveElastomeric element 782 under natural assembled state its with certain pretightning force be that the spring in figure such as has been in certain compressionState tightly presses round steel ball on sealing circular conical surface 563.
It is shown in Figure 7, in another preferred embodiment of the invention, flap valve piece is set by the second control valve 80One way stop peturn valve.When design, flap valve piece one-way check valve designs are at certain preload amount.If Figure 11 is to as shown in figure 13,The preload amount of elastomeric element 782 in the application is to control the key factor of middle pressure chamber pressure, according to middle pressure chamber 100 and compression chamber90 connection angular dimension, the early warning pressure on elastomeric element 782 are generally located within the scope of 0.3~0.8MPA.
According to another aspect of the present invention, a kind of air conditioner, including screw compressor are provided, screw compressor is above-mentionedScrew compressor in embodiment.
In accordance with a further aspect of the present invention, a kind of backpressure regulation method of screw compressor is provided, screw compressorBackpressure regulation method realizes that the backpressure regulation method of screw compressor includes: using above-mentioned screw compressor
When the pressure Pb in middle pressure chamber 100 is higher than the pressure Ps predetermined value of low pressure air suction chamber 110, the first interface channel 50On the first control valve 70 open, prevent fluid countercurrent current to the compression chamber 90 in middle pressure chamber 100 from causing middle pressure chamber 100 and compression chamberPressure oscillation in 90 enables the pressure maximum in middle pressure chamber 100 to stablize and is being connected to a certain pressure before terminating with compression chamber 90Pb, then, by the first control valve 70, the second control valve 80,90 pressure Pm of compression chamber, 110 pressure Ps of low pressure air suction chamber andThe common adjusting control of the preload resistance △ P of second control valve 80 is lower to realize following control: 1, when 100 pressure Pb of middle pressure chamber is greater thanWhen the preload resistance △ P of the pressure Ps of low pressure air suction chamber 110 and the second control valve 80, i.e. Pb > (Ps+ △ P), the second control of controlValve 80 is opened, and fluid leaks to low pressure air suction chamber 110 in middle pressure chamber 100, is finally stably maintained at the pressure in middle pressure chamber 100Ps+△P；3, when 100 pressure Pb of middle pressure chamber is lower than the pressure Ps of low pressure air suction chamber 110 and the preload resistance △ of the second control valve 80When P, i.e. Pb < (Ps+ △ P), the second control valve 80 of control is closed, so that the pressure in middle pressure chamber 100 maintains Pb level.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements: the present invention is logicalIt crosses and one-way non-return structure is being set close to intermediate pressure cavity side, only allow fluid to flow to intermediate cavity from compression chamber, and fluid is logicalThere is lesser circulation loss when crossing the non-return structure；Being connected to for intermediate pressure cavity and stent outer low pressure chamber is connected in the present inventionMode is the through-hole being directly provided on bracket, and one-way non-return structure is provided in through-hole, only allows fluid from intermediate pressureChamber circulates to low-pressure side, and is provided with certain preload pressure, when the intermediate pressure of non-return structure side is greater than the low of the other sideWhen pressure pressure+preload pressure, intermediate cavity is just connected to suction chamber；Intermediate pressure cavity and upper cover periphery low pressure chamber in the present inventionMode of communicating is the connection through-hole being provided on bracket and quiet disk, and one-way non-return structure is provided in through-hole, only allows fluidIt circulates from intermediate pressure cavity to low-pressure side, and is provided with certain preload pressure, when the intermediate pressure of non-return structure side is greater thanWhen low pressure+preload pressure of the other side, intermediate cavity is just connected to low pressure chamber.
Screw compressor backpressure regulation structure of the invention is basically stable at the pressure that back pressure is intracavitary under same operatingPhase same level, pump housing sealing is more reliable, promotes compressor performance.And under different operating conditions, backpressure regulation knot through the inventionStructure, compressor pump compression chamber can obtain of substantially equal sealing surplus, and pump housing sealing is more reliable, and the operating condition for promoting compressor is suitableYing Xing is promoted compressor entirety efficiency (APF efficiency).
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this wayData be interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to hereinSequence other than those of diagram or description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended thatBe to cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units notThose of be necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes, sideThe intrinsic other step or units of method, product or equipment.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this fieldFor art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repairChange, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.