CN1971050A - Vortex type compressor - Google Patents

Abstract

Translated fromChinese

本发明涉及一种涡旋式压缩机，以简单的构成实现损失的抑制及效率的提高。其具有：设置的盘旋涡卷(8)的背面中心部引导贮存于密封容器底部的润滑油的第一空间(33)；设于盘旋涡卷(8)的背面并成为排出压力和吸入压力之间的压力的第二空间(18)，为进行第二空间(18)内的压力调节，还具有根据经由固定涡卷(7)上形成的连通路(2f)导入的吸入压力或压缩初期压力和第二空间(18)内的压力之差，使第二空间(18)内的流体经由连通路(2f)脱离吸入室或压缩室的背压调节阀(2)，其中，在盘旋涡卷(8)的卷片(8b)上设置通孔(1)，由此，将平均压力比连通路(2f)内的平均压力高的压缩室和第二空间(18)连通。

The present invention relates to a scroll compressor capable of suppressing losses and improving efficiency with a simple configuration. It has: the first space (33) for guiding the lubricating oil stored at the bottom of the sealed container at the center of the back of the spiral scroll (8); it is set on the back of the spiral scroll (8) and becomes the pressure between the discharge pressure and the suction pressure. The pressure in the second space (18) between the two spaces, in order to adjust the pressure in the second space (18), also has suction pressure or initial compression pressure introduced through the communication path (2f) formed on the fixed scroll (7). and the pressure difference in the second space (18), the fluid in the second space (18) is separated from the back pressure regulating valve (2) of the suction chamber or the compression chamber through the communication path (2f), wherein, in the spiral scroll (8) A through hole (1) is provided in the web (8b) to communicate with the second space (18) and the compression chamber whose average pressure is higher than the average pressure in the communication path (2f).

Description

Scroll compressor

Technical field

The present invention relates to the refrigerant gas compression and use scroll compressor, particularly relate to the scroll compressor that is suitable for room air conditioner.

Background technique

As everyone knows, scroll compressor is a structure as follows, use is upright two scrollworks that are provided with the scroll roll film on discoideus cover plate, and it is meshing with each other the configuration of each roll film subtend, by establishing a scrollwork is fixed scroll, if another makes the volume that is formed at a plurality of pressing chambers between the mutual roll film dwindle compressed fluid in turn for spiraling scrollwork and it is spiraled.

Therefore, in scroll compressor, when carrying out compressed action, produce axial power that fixed scroll and the scrollwork that spirals are drawn back mutually (below be called pulling-off force).At this moment, when two scrollworks are drawn back, occur gap (space) between the tooth top of roll film and the tooth root, cause the seal of pressing chamber bad, therefore, compression efficiency reduces.

Therefore, the cover plate back side at the scrollwork that spirals forms back pressure chamber, make pressure in this back pressure chamber constitute pressure between head pressure and the suction pressure, be pressed to the fixed scroll side by this pressure scrollwork that will spiral, pulling-off force is eliminated, produced attraction force (attraction force) between scrollwork and the fixed scroll spiraling simultaneously.

But, when this moment, attraction force was excessive, the thrust that acts between scrollwork and the fixed scroll of spiraling increases, the tooth top of each roll film and the sliding friction of tooth root increase, the efficient of compressor reduces, therefore, attraction force need be adjusted to suitable intensity, therefore, via back pressure regulating valve back pressure chamber and suction chamber are communicated with, and the fluid in the pressure official post back pressure chamber of corresponding back pressure chamber and suction chamber breaks away from suction chamber, regulates the size of back pressure thus, more than such scroll compressor be suggested (for example with reference to Patent Document 1) as prior art.

In addition, as other prior art, the known usually mechanism that gives oil mass that adjustment is arranged pressing chamber.At this, the lubricant oil that is stored in the compressor bottom is because the lubricated and sealing of the lubricated and pressing chamber of bearing portion and slide part, therefore, supply with to pressing chamber via bearing portion, but what this moment, bearing portion needed gives oil mass usually more than pressing chamber, therefore, when the lubricant oil through bearing portion all supplies in the pressing chamber, give oil mass excessive to pressing chamber.

Like this, when to the increasing of compressor, be in the lubricant oil heating of discharging the gas equal temperature and suck air, bad phenomenon such as loss on heating generation take place, constitute the main cause that performance reduces to oil mass.Therefore, bearing portion has been carried out the bottom that lubricated most of lubricant oil returns seal container, only some lubricant oil supplies in the pressing chamber, and such scroll compressor also is suggested (for example with reference to Patent Document 2) as prior art at this.

Patent Document 1: the spy opens flat 10-110688 communique

Patent Document 2: No. 3344843, special permission communique

Much less above-mentioned prior art is the generation that has taken into full account loss, but the further raising of efficient is had problem.

Promptly, at first, in the prior art of putting down in writing in thePatent Document 1, when the pressure in back pressure chamber raises, make the fluid in the back pressure chamber break away from suction chamber by pressure regulator valve, but can make the fluid expansion of the high pressure after the once compression in this case and return suction chamber, consequently produce so-called expansion-loss again.

Secondly, in the prior art of record, realize losing reduction in the Patent Document 2 by adjusting back pressure, but as this method, on the cover plate of scrollwork that spirals, be provided with the hole that back pressure chamber and pressing chamber always are communicated with, in this case, spiral scrollwork rotation once during, from back pressure chamber to pressing chamber, afterwards from pressing chamber to back pressure chamber, the flow direction of fluid all changes at every turn, therefore, produced its compression loss that causes, just so-called breathing loss.

Therefore, prior art can not fully suppress to expand and the generation of breathing loss again, and is having problems aspect the further raising of efficient.

Summary of the invention

The objective of the invention is to, a kind of scroll compressor is provided, with the inhibition of simple formation realization loss, the raising of implementation efficiency.

The following realization of above-mentioned purpose promptly, provides a kind of scroll compressor, and it has: the upright fixed scroll that is provided with the scroll roll film; Relative with this fixed scroll rotatably be provided with and upright be provided with and the roll film of described fixed scroll between form the scrollwork that spirals of the scroll roll film of a plurality of pressing chambers; Be located at the back side of the described scrollwork that spirals and the space of the pressure between formation and head pressure and the suction pressure, for the pressure that carries out in the described space is regulated, also have the poor of suction pressure that the access that forms according to the tooth top via the most peripheral roll film of described fixed scroll imports or the pressure in compression initial stage pressure and the described space, make fluid in the described space break away from the back pressure regulating valve of suction chamber or pressing chamber via described access, wherein, in described pressing chamber, the middle pressure pressing chamber higher than the middle pressure in the described access will be communicated with, be arranged on the described scrollwork that spirals with the through hole in described space.

At this moment, the roll film tooth top that described through hole also can penetrate into this scrollwork that spirals from the cover plate towards the described scrollwork that spirals in described space forms, and also can make aperture by described pressing chamber side than little by the aperture of described space side.

Like this, the space of back pressure chamber of the scrollwork that spirals and the through hole that pressing chamber is communicated with will be become owing to be provided with, so, when the pressure of back pressure chamber is excessive, fluid in the back pressure chamber flows out to the pressing chamber at suction chamber or compression initial stage via back pressure regulating valve and access, and its part flows out to the pressing chamber of the pressure in the pressing chamber that suction chamber or pressure is higher than the compression initial stage by through hole simultaneously.

Consequently, with compare for carrying out the expansion-loss again of backpressure regulation when making the fluid of the back pressure chamber that once compression obtains all break away from the suction chamber or the pressing chamber at compression initial stage, only some breaks away from the pressing chamber that suction chamber or pressure are higher than the pressure in the pressing chamber at compression initial stage, therefore, can reduce the loss that expansion again causes.

In addition, when the pressure of back pressure chamber is too small, only back pressure regulating valve is the effect that can not realize improving back pressure, if but have back pressure hole, then fluid will flow into back pressure chamber from pressing chamber, back pressure is improved,, thereby can prevent to draw back two scrollworks and the compressor efficiency that causes reduces because such restoring force works.

Particularly under the situation that the tooth top that through hole is penetrated into roll film from the cover plate of the scrollwork that spirals is provided with, when the fluid in back pressure chamber enters pressing chamber by back pressure hole, the tooth top of roll film by and the cover plate (tooth root portion) of the fixed scroll that slides between small gap.Because this gap becomes flow path resistance, therefore, compare with the situation that back pressure chamber and pressing chamber directly are communicated with, but suppression fluid flow freely into outflow, therefore, it is littler the pressure oscillation in the back pressure chamber can be suppressed ground.

At this moment, as mentioned above, rotate between 1 time at the scrollwork that spirals, from back pressure chamber to pressing chamber, from pressing chamber to back pressure chamber, the each breathing loss that causes that changes of the direction of fluid produces, but because that the pressure oscillation in the above-mentioned back pressure chamber is suppressed ground is littler, therefore, it is littler that this breathing loss also can be suppressed ground.

According to the present invention,, therefore, can realize the further raising of compression efficiency owing to can reduce the loss of adjusting along with the back pressure of the attraction force that is used to regulate fixed scroll and spiral scrollwork.In addition, according to the present invention, because when back pressure reduces, the restoring force that is used to improve back pressure works, and therefore, in this one side, also can realize the further raising of compression efficiency.

Description of drawings

Fig. 1 is the sectional arrangement drawing of a mode of execution of expression scroll compressor of the present invention;

Fig. 2 is the front view of detailed structure that is used to illustrate the fixed scroll of an embodiment of the present invention;

Fig. 3 is the front view and the sectional drawing of detailed structure that is used to illustrate the scrollwork that spirals of an embodiment of the present invention;

Fig. 4 is the plan view of the fixed scroll of an embodiment of the present invention and the scrollwork that spirals;

Fig. 5 is the sectional drawing of the back pressure regulating valve of an embodiment of the present invention;

Fig. 6 is the performance plot that is used to illustrate the action of an embodiment of the present invention.

Among the figure: 1 through hole, 2 back pressure regulating valves, 3 through holes, 4 cross-drilled holes, 5 main bearings, 6 discharge tubes, 7 fixed scrolls, 8 spiral scrollwork, 9 casings, 10,10a bent axle, 11 swivel bearings, 12 Othemos rings, 13 pressing chambers, 14 inlet holes, 15 tap holes, 16 motor, 17 spaces, 18 back pressure chambers.

Embodiment

Below, according to illustrated mode of execution scroll compressor of the present invention is elaborated.At this, at first, Fig. 1 is the sectional drawing of an embodiment of the present invention, in the figure, at first, the 7th, fixed scroll describes in detail as Fig. 2, the support 7d of this roll film ofencirclement 7b that it forms by theroll film 7b of the face of the upright side of being located at this cover plate 7a of discoideus cover plate 7a, scroll and at the outer circumferential side tubular of cover plate 7a constitutes the upright face formation tooth root 7c that is provided with theroll film 7b of cover plate 7a.At this, this Fig. 2 represents the situation of thefixed scroll 7 seen from the downside of Fig. 1.

And, by screw etc. support 7d is installed on the framework 17, and framework 17 is installed on the casing 9 that forms general cylindrical shape by fixation methods such as welding, thus, thisfixed scroll 7 remains on the assigned position in this casing 9.

On the other hand, the 8th, scrollwork spirals, this spiral scrollwork such as Fig. 3 (a) know clearly and show, by discoideus cover plate 8a, the surface from cover plate 8a identical with theroll film 7b offixed scroll 7 is that theroll film 8b of the upright scroll of establishing of tooth root 8c and the boss 8d that is located at the back side central authorities of cover plate 8a constitute, in framework 17,, and in framework 17, rotatably keeping withfixed scroll 7 relative configurations.At this moment, at the peripheral part of this cover plate 8a, become the cover plate face 8e of the scrollwork 8 that spirals with the face of the cover plate 7a butt offixed scroll 7.

Secondly, as mentioned above, casing 9 becomes general cylindrical shape, and portion takes in motor 16 and reaches the scroll wraps that is made of thefixed scroll 7 and the scrollwork 8 that spirals within it, makes airtight construction behind the inclosure lubricant oil.At this moment, the axle 10 of motor 16 under the state that is keeping rotor 16a with the axis coaxle offixed scroll 7, remain on the framework 17 and can rotate freely by main bearing 5 and supplementary bearing 23.

And, being formed with the bent axle 10a of the eccentric distance δ with regulation at this front end of 10, this bent axle 10a rotatably is inserted into the boss part 8d of the scrollwork 8 that spirals by swivel bearing 11.Therefore, spiral scrollwork 8 its axis with respect to the eccentric axis offixed scroll 7 be configured in theframework 7 under the state of predetermined distance δ.

At this moment, as shown in Figure 4, theroll film 8b of the scrollwork 8 that spirals is overlapping at thestagger roll film 7b of predetermined angular andfixed scroll 7 of Zhou Fangxiang.And, on this spirals scrollwork 8, be provided with Othemos ring 12, make its as be used for limit this scrollwork 8 that spirals make its can not the state of rotation with respect tofixed scroll 7 under the mechanism of relative rotary motion.

Therefore, under this state,, then betweenroll film 7b androll film 8b, be formed with volume along with moving and a plurality of pressing chambers 13 of the crescent shape that dwindles continuously to central part from periphery if the scrollwork 8 that spirals is rotatablely moved by motor 16.For example, in the situation of asymmetric roll film, as shown in Figure 4, form spiral the interior linesside pressing chamber 13a and the outside lineside pressing chamber 13b that spirals respectively in the interior lines side of the scrollwork 8 that spirals and outside line side.

At this moment,space 20 shown in Figure 4 is suction chambers, thesesuction chamber 20 expressions suck the space midway of fluid, it is communicated withinlet hole 14 on being located atfixed scroll 7, and carry out from the phase place that rotatablely moves of the scrollwork 8 that spirals,inlet hole 14 is closed, and the moment of closing end of fluid is changed to pressing chamber 13 (13a, 13b).

Therefore, as shown in Figure 4,inlet hole 14 is for being communicated with the outer circumferential side of the cover plate 7a that wearsfixed scroll 7 with suction chamber 20.And, near the scrollwork center of the cover plate 7a of thisfixed scroll 7, be equipped withtap hole 15, it is communicated with thepressing chamber 14 of interior all sides.

Secondly, the action to this scroll compressor shown in Figure 1 describes.At first, to motor 16 energisings, rotor 16a is produced changes distance, axle 10 rotations, at this moment, this rotation is passed to the scrollwork 18 that spirals from the bent axle 10a of axle 10 via swivel bearing 11, thus, the scrollwork 8 that spirals is the rotatablely move turning radius of predetermined distance δ of center with the axis of fixed scroll 7.At this moment, the limitation function of above-mentioned Othemos ring 12 works, make the scrollwork 8 that spirals do not carry out from then spiral (below this action being called " rotation ").

And, owing to this rotation of spiraling scrollwork 8 makes the pressing chamber 13 that forms between eachroll film 7b, 8b to central mobile, the volume of pressing chamber 13 moves with this and dwindles continuously, consequently, in each pressing chamber 13, compress the fluid (fluid that contains gas) that sucks frominlet hole 14 in turn, fluid after the compression is discharged in the casing 9 fromdischarge tube 15, and for example supplies to the freeze cycle by discharge tube 6 in casing 9.

At this moment, be provided with positive displacement or centrifugal oil feed pump 21 in the lower end of axle 10, lubricant oil resides in the bottom of casing 9.Therefore, when axle 10 rotations, oil feed pump 21 actions suck lubricant oil from the lubricant oil suction port of being located in the oil feed pump casing 22 25.Then, the lubricant oil that sucks is directed to top from the exhaust port 28 of the oil feed pump through hole 3 by axle 10, from framework 17, enter in the scrollwork 8 that spirals, and flow in first space 33 that the flange shape boss parts 34 by the boss part 8d that is in the scrollwork 8 that spirals form, realize lubricating of each several part this moment.

Lubricated doing to this moment specifies, and at first, the part of lubricant oil is lubricated supplementary bearings 23 by the cross-drilled hole of being located on the axle 10 24, and returns bottom half.In addition, other part of lubricant oil arrives first space 33 simultaneously by being located at the cross-drilled hole 4 lubricated main bearings 5 on the axle 10.And then other part of lubricant oil reaches the top of bent axle 10a by through hole 3, and lubricated swivel bearing 11 enters first space 33.

At this moment, owing on axle 10, be provided with than the big many paths in bearing play and promptly give oil groove 27,28, therefore, lubricant oil during by main bearing 5 and swivel bearing 11 does not almost have pressure gradient, therefore, the refrigeration agent that dissolves in the lubricant oil can not be depressurized, and can not foam yet, therefore, the reliability that can hold than the highland retainer shaft.

At this, the most of lubricant oil that flows into first space 33 returns bottom half from oil drainage hole 26a by oil exit pipe 26b, but this moment is because it is the internal face of the close casing 9 of outlet of oil exit pipe 26b and the structure that lubricant oil flows out downwards, therefore, suppress lubricant oil and discharge gas and mixes and be frozen to circulate and take away, consequently, prevent the performance reduction of freeze cycle, and the lubricant oil that can eliminate in the pressing chamber extremely reduces, the worry of the reliability of infringement compressor.

And, the remainder that flow into the lubricant oil in this first space 33 is used for the sealing of lubricated and pressing chamber 13 of Othemos ring 12 and lubricated, this moment the upper-end surface of sealed member 32 and the boss parts 34 that spiral end face between as the leakage of oil device action, thus, the lubricant oil of the minimum flow that only needs this moment flows into back pressure chamber 18.

In addition, sealing parts 32 insert in the annular groove 31 that is arranged on the framework 17, together insert with wavy spring members (not shown) this moment, thus, become head pressure first space 33, and become between the back pressure chamber 18 of intermediate pressure of suction pressure and head pressure and be spaced.

At this moment, be provided with a plurality of holes 30 on the boss parts 34 that spiral, it is also as above-mentioned leakage of oil device action.Circular movement is carried out owing to follow the running of spiraling of the scrollwork 8 that spirals to stride across sealed member 32 in these a plurality of holes 30, and is therefore adjacent alternately with first space 33 and back pressure chamber 18, plays the effect that the lubricant oil in first space 33 is transported to back pressure chamber 18.And can by the number in these a plurality of holes 30 and diameter and the degree of depth in each hole arbitrarily regulate to the amount of the lubricant oil of back pressure chamber 18 oil supply this moment.

Therefore,, possess: have pressure at the back side central parts of the relative scrollworks 8 that spiral that rotatably are provided with, and guiding is stored in first space 33 of the lubricant oil of seal container bottom near head pressure withfixed scroll 7 according to this mode of execution; With the back side of being located at the scrollwork 8 that spirals and become head pressure and second space 18 of the intermediate pressure of suction pressure; The device that needs the lubricant oil of irreducible minimum from first space 33 to second space, 18 leaks, thus, the most of lubricant oil in first space 33 does not mix with pressure in the seal container and returns bottom the seal container.

But, in the scroll compressor of this Fig. 1, as shown in the figure, onfixed scroll 7, be provided with back pressure regulating valve 2.Therefore, when back pressure raise, the back pressure regulating valve 2 that will be located on the access of suction chamber 20 (or compression initial stage pressing chamber 13) was opened, and enters the lubricant oil of back pressure chamber 18, flows in the suction chamber 20 (or the pressing chamber 13 at compression initial stage).Then, discharge fromtap hole 15 by pressing chamber 13, a part is supplied with freeze cycle from discharge tube 6, and remainder separates with refrigeration agent in casing 9, stores in the bottom.

At this, with Fig. 2 and Fig. 5 this back pressure regulating valve 2 is elaborated, this back pressure regulating valve 2 has: valve body 2a, spring 2b, the member 2c that suppresses this spring 2b, the space 2d that is communicated with back pressure chamber 18, with suction chamber 20 (or the pressing chamber 13 at compression initial stage) the space 2e that is communicated with, the access 2f that is communicated withfixed scroll 7, space 2d is separated configuration valve body 2a and spring 2b by space 2e.

Therefore, valve body 2a is pressed against the opening portion that is communicated with space 2d by the fixing spring 2b of member 2c, pressure in the suction chamber 20 (or the pressing chamber 13 at compression initial stage) of pressure in the 2d of space in being higher than the space 2e that imports via access 2f and during corresponding to the total pressure of the pressure of the pushing force of spring 2b, the effect with space 2d and space 2e connection is played in (top among Fig. 5) action upward.At this moment, if the pressure of establishing in the back pressure chamber 18 (back pressure) is Pb, then it is controlled as the pressure shown in the following formula (1).

Pb＝Ps+α·······(1)

At this, Ps is the pressure (suction pressure) of suction chamber 20 (or the pressing chamber 13 at compression initial stage), and α is corresponding to the pressure of the pushing force of spring 2b (=certain value).

But formation so far is identical with prior art, at this, below the distinctive formation of this embodiment is described.At first, in this embodiment, as shown in Figure 1, on theroll film 8b of scrollwork 8 that spirals, be provided with through hole 1.Then, this throughhole 1 is known clearly as Fig. 3 and is shown, the tooth top from the face of back pressure chamber 18 sides of cover plate 8a to roll film 8 is provided with in the mode that connects this tooth top 8b.In this Fig. 3, with (a) of figure the situation of the scrollwork 8 that spirals seen from the upside of Fig. 1, (b) of Fig. 3 is the sectional drawing with the B-B line of figure (a).

And the position on theroll film 8b of the throughhole 1 of this moment is that the pressure of pressing chamber 13 sides of throughhole 1 becomes the roughly position of back pressure value.At this, the pressure of pressing chamber 13 sides of throughhole 1 is described.The pressure of pressing chamber 13 sides (upside among Fig. 1) of throughhole 1 is the intermediate value of pressure of the pressure and the outside lineside pressing chamber 13b that spirals of interior linesside pressing chamber 13a of spiraling.

But the pressure of the pressure of interior linesside pressing chamber 13a and the outside lineside pressing chamber 13b that spirals changes during scrollwork 8rotation 1 time of spiraling because spiral this moment, and therefore, the intermediate value of rotating each the par pressure in 1 time becomes the pressure of pressing chamber 13 sides of through hole 1.Therefore, with reference to Fig. 6 it is done and illustrate in greater detail.

At this, at first Fig. 6 is the chart of the relation of pattern ground expression crank shaft angle (phase place of the scrollwork that spirals) and compression indoor pressure, horizontal week expression crank shaft angle, vertical week expression compression indoor pressure.Along with the motion of spiraling of the scrollwork that spirals, the pressure of the insidecord pressing chamber 13a that spirals rises shown in characteristic line A-D-E-C like that, and the pressure of the outside line side of spiraling pressingchamber 13b rises to head pressure from suction pressure like that shown in characteristic line A-B-C.

At this moment, the pressure of pressing chamber 13 sides of throughhole 1 changes as the line F-G of between the two pressure between its open region.The pressure of time average that becomes this line F-G is in order to become roughly back pressure value, and the position onroll film 8b is provided with throughhole 1.

At this moment, throughhole 1 is shown in Fig. 3 (a), and the aperture d1 of the side by pressing chamber 13 is littler than the aperture d2 of the side by back pressure chamber 18.Thus, the facewidth that suppresses theroll film 8b that the tooth root with fixed scroll 7c slides reduces because of throughhole 1, and the part that aperture d1 only is set in the part of throughhole 1 simultaneously get final product, therefore, is adding man-hour, can shorten the interval of using thin drill bit, and can make processing simply.

Secondly, the effect and the action of this embodiment's throughhole 1 described, at present, at this by flowing into fluid (having dissolved in the lubricant oil of refrigeration agent) the raising back pressure in the back pressure chamber 18.So, in this case, the fluids in the back pressure chamber 18 flow in the pressing chamber 13 of the high slightly initial stage compressive state of suction chambers or pressure ratio suction pressure by back pressure regulating valve 2.So, back pressure rises, and back pressure regulating valve 2 is opened, and this can make reexpand suction pressure or be in pressure in the pressing chamber of the initial stage compressive state approaching with it of the temporary transient fluid that has compressed, and therefore, produces big compression loss this moment.

Yet in this embodiment, owing to be provided with throughhole 1, therefore, under the situation that back pressure rises, the part of the fluid in the back pressure chamber 18 flows in the pressing chamber 13 by this through hole 1.At this moment, the position of throughhole 1 is as Fig. 6 is illustrated, and for the pressure in the pressing chamber 13 rise to position near back pressure, therefore, the fluid of inflow can not expand again and be compressed.

Therefore, in this embodiment's situation, even when back pressure rises, whole fluids in the back pressure chamber 18 can not expand into suction pressure or approaching with it compression indoor pressure by back pressure regulating valve 2 more yet, and its part flows in the pressing chamber 13 that rises near back pressure by throughhole 1, no longer expand and be compressed, therefore, can realize reducing loss and the high scroll compressor of compression efficiency.

At this moment, according to this embodiment, above-mentioned loss reduction can realize by throughhole 1 so simple formation only is set on the scrollwork 8 that spirals, and therefore, can suppress to realize the high scroll compressor of compression efficiency when cost raises.

In addition, in this embodiment, owing on the scrollwork 8 that spirals, be provided with throughhole 1, therefore, when the fluid in back pressure chamber 18 flows in the pressing chamber 13 by throughhole 1, the small gap between the tooth top 8b of theroll film 8b by being in the scrollwork 8 that spirals and the tooth root 7c of fixedscroll 7.

Therefore, this gap becomes flow path resistance, the inflow and outflow freely of suppression fluid, therefore, according to this embodiment, with for example on the scrollwork cover plate 8a that spirals, the hole being set back pressure chamber 18 is compared with the situation that pressing chamber 13 directly is communicated with, the pressure oscillation in the back pressure chamber 18 can be suppressed for littler.

In this case, scrollwork 8 everyrotation 1 circles spiral, the flow direction of fluid each just from back pressure chamber 18 conversion to pressing chamber 13, from pressing chamber 13 conversion to back pressure chamber 18, but in this embodiment, because by the flow of above-mentioned fluid resistance inhibition, therefore with the fluid of the counter-rotating of such flow direction, can suppress forr a short time with compression loss (so-called breathing loss), and can realize higher efficient.

But, in such scroll compressor, have the situation that back pressure is reduced because of its operating condition.And in this case, two scrollworks are drawn back, and the seal of pressing chamber worsens, and compression efficiency is reduced, but according to this embodiment, can prevent above-mentioned bad.Therefore, below its reason is described.

When for example under pressurized gas pressure increased pressure condition, turning round, the scrollwork 8 that spirals increases because of the tilting moment that this pressurized gas pressure tilts, the generation scrollwork 8 that spirals is done the so so-called swing running of the running of spiraling whirling as gyro, gap between the slip surface of the cover plate face 8e of the scrollwork 8 that spirals and fixedscroll 7 is increased, and leak to thesuction chamber 20 or the amount of leaking to the lubricant oil of the pressing chamber 13 at compression initial stage from back pressure chamber 18 by this gap and to increase from back pressure chamber 18.

On the other hand, only enter seal ring 32 owing to flow into the lubricant oil of back pressure chamber 18 from first space 33, therefore, the number in a plurality of holes that are provided with on the boss parts 34 of its amount by the rotating speed of compressor and the scrollwork 8 that spirals and the diameter in each hole and degree of depth decision, if and the amount that flows into the lubricant oil in this back pressure chamber 18 is lower than the amount of going into the lubricant oil of thesuction chamber 20 or the pressure 13 at compression initial stage from two cover plate surface currents, then back pressure reduction.

At this moment, in only having the existing scroll compressor of back pressure regulating valve, even when such back pressure reduces, because back pressure regulating valve provided thereon just moves as safety check simply as backpressure adjusting mechanism, therefore, can not realize improving the effect of back pressure.

Relative therewith, according to the foregoing description, since have throughhole 1, therefore, if back pressure reduces, then fluid flows into back pressure chamber 18 from pressing chamber 13, back pressure is raise, therefore, can play the effect of the restoring force of the direction that two scrollworks are sealed, therefore, can the amount of preventing scrollwork be drawn back the reduction of the compressor efficiency that causes.

As mentioned above, according to the foregoing description, can be reduced to the attraction force of regulating the fixed scroll and the scrollwork that spirals and the loss of following backpressure regulation of working, and then can when back pressure reduces, play the effect of the restoring force of the direction that improves back pressure.

Claims (4)

Translated fromChinese

1、一种涡旋式压缩机，具有：立设有涡卷状卷片的固定涡卷；与该固定涡卷相对可旋转地设置且立设有在与所述固定涡卷的卷片之间形成多个压缩室的涡卷状卷片的盘旋涡卷；第一空间，其在所述盘旋涡卷的背面中心部具有接近排出压力的压力并引导贮存于密封容器底部的润滑油；第二空间，其设于所述盘旋涡卷的背面并成为排出压力和吸入压力之间的压力，并设置使需要最小限的润滑油从所述第一空间向所述第二空间泄漏的装置、和使所述第一空间内的大部分润滑油不与密闭容器内的压缩气体混合而返回密闭容器底部的装置，另外，为进行所述第二空间内的压力调节，还具有根据经由所述固定涡卷的最外周卷片的齿顶形成的连通路导入的吸入压力或压缩初期压力和所述第二空间内的压力之差，使所述第二空间内的流体经由所述连通路脱离吸入室或压缩室的背压调节阀，该涡旋式压缩机的特征在于，1. A scroll compressor, comprising: a fixed scroll vertically provided with a scroll-shaped wrap; it is rotatably arranged relative to the fixed scroll and vertically arranged between the wrap of the fixed scroll The spiral wrap of the scroll-shaped wrap that forms a plurality of compression chambers between them; the first space, which has a pressure close to the discharge pressure at the back center of the spiral wrap and guides the lubricating oil stored at the bottom of the sealed container; the second space Two spaces, which are provided on the back of the orbiting scroll and become a pressure between the discharge pressure and the suction pressure, and are provided with means for leaking lubricating oil from the first space to the second space as required, and a device for returning most of the lubricating oil in the first space to the bottom of the closed container without mixing with the compressed gas in the closed container. In addition, in order to regulate the pressure in the second space, there is also a method according to the The fluid in the second space escapes through the communication path through the difference between the suction pressure or initial compression pressure and the pressure in the second space introduced by the communication path formed by the tooth top of the outermost wrap of the fixed scroll. A back pressure regulating valve for a suction chamber or a compression chamber, the scroll compressor is characterized by,在所述压缩室中，将连通平均压力比所述连通路内的平均压力高的压缩室和所述第二空间的通孔设置在所述盘旋涡卷上。In the compression chamber, a through hole that communicates the compression chamber having an average pressure higher than the average pressure in the communication passage with the second space is provided in the spiral wrap.2、如权利要求1所述的涡旋式压缩机，其特征在于，所述通孔形成为从面向所述空间的所述盘旋涡卷的盖板贯通到该盘旋涡卷的卷片齿顶。2. The scroll compressor according to claim 1, wherein the through hole is formed to penetrate from the cover plate of the spiral wrap facing the space to the tooth top of the spiral wrap. .3、如权利要求1所述的涡旋式压缩机，其特征在于，所述通孔，通过所述压缩室侧的孔径比通过所述空间一侧的孔径小。3. The scroll compressor according to claim 1, wherein the through hole has a smaller diameter on the side passing through the compression chamber than on the side passing through the space.4、如权利要求1～3中任一项所述的涡旋式压缩机，其特征在于，所述流体是制冷剂气体。4. The scroll compressor according to any one of claims 1 to 3, wherein the fluid is refrigerant gas.

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