Anti-leak speed limit relief arrangementTechnical field
The invention belongs to valve technology field, more particularly to a kind of anti-leak speed limit relief arrangement.
Background technology
Unloading valve its can be by discharge degree.Such as applied in field of tool.Instrument includes automotive tools etc..
The structure of unloading valve includes valve pocket and the spool that is arranged in valve pocket, and the open-top unidirectional valve ball of spool is so as to fulfill unloadingLotus, unidirectional valve ball pass through a spring reset.
Above-mentioned this unloading valve, although it disclosure satisfy that requirement to a certain extent, this valve lacksBe trapped in：
1st, when the pressure of oil circuit is relatively low, leakproofness is poor between the inner wall of unidirectional valve ball and valve pocket at this time, causes to depositLeaking, using there are security risk.
2nd, the way of contact between valve ball and the inner wall of valve pocket contacts for line, its leakproofness is poor.
3rd, the speed limit poor-performing of existing unloading valve.
In order to solve above-mentioned technical problem, for example, Chinese patent literature discloses a kind of unloading valve [application number：200720027357.4], it includes valve body, the top connection upper cover of valve body, lower part connection exhaust body；It is internally provided with upper cover flatWeigh piston and balancing spring, and upper spring seat and lower spring cup are equipped with above and below balancing spring, is set above upper spring seatThere is adjusting screw, adjusting screw is stretched out outside upper cover, is equipped with the outside of dummy pistonType sealing ring, under dummy pistonPortion is equipped with needle-valve, and minor valve is connected on needle-valve, is equipped with return spring in the outside of needle-valve, aperture is internally provided with needle-valve；The middle lower portion of valve body is equipped with the piston that discharges water, and is equipped with spring on the outside of the piston that discharges water, spring lower part is connected with spring base, in valve bodyBoth sides are equipped with air inlet and gas outlet, and check valve is equipped with gas outlet, and gas outlet is communicated with the first cavity by passage, discharged waterThe second cavity is equipped with above piston.The program has the advantages of rational in infrastructure, range of pressure fluctuations is small, and pressure adjusting is stablized.
Although above-mentioned scheme has many advantages, such as above, above-mentioned scheme is not improved above-mentioned technology and is askedTopic, therefore, is badly in need of designing a plunger pump that can solve above-mentioned technical problem
The content of the invention
Regarding the issue above, the present invention provides a kind of anti-leak and safer, speed limit performance is preferably anti-to let outLeak speed limit relief arrangement.
To reach above-mentioned purpose, present invention employs following technical proposal：This anti-leak speed limit relief arrangement includes tubularDrain the oil valve seat, tubular drain the oil valve seat inner wall in the middle part of be equipped with ring-type interior protuberance and ring-type interior protuberance drains the oil tubular inside valve seatIt is separated into exocoel and inner cavity chamber, the internal diameter of ring-type interior protuberance is less than tubular and drains the oil the internal diameter of valve seat, and the present apparatus is inserted including one endValve rod and drain the oil the first oilhole for being equipped with valve seat and being connected with exocoel in tubular in exocoel indoor drain the oil, in valve rod of draining the oilIt is equipped between inner and ring-type interior protuberance and is located at indoor first spring of exocoel, outer end is equipped with inner cavity chamber can inserts in ring-typeSpool of draining the oil in interior protuberance, son before being threadedly coupled and being separated into inner cavity chamber with inner cavity chamber is equipped with the middle part of inner cavity chamberChamber and the annular spacer of rear sub-chamber, are equipped with preceding sub-chamber between the inner of annular spacer and spool of draining the oilSecond spring and surface seal structure is equipped between spool and the rear end of ring-type interior protuberance draining the oil, drain the oil in tubular in valve seatEnd inner wall is equipped with reaming and the second oilhole connected with the reaming, is equipped with what can be moved axially along reaming in reamingDamping spool and be equipped with filtration at the aperture of reaming, the axial centre of damping spool be equipped with damping hole and when it is oily fromDamping spool described in when filtration is entered in rear sub-chamber closes the second oilhole, in annular spacer and damping spoolBetween be equipped with the 3rd spring.
The effect of second spring and the 3rd spring, it may insure the elastic force of each spring, avoids due to lengthIt is longer to cause the problem of elastic force is inadequate or elasticity is poor.
The effect of second spring is cooperateed with by surface seal structure, it may insure the leakproofness in low-pressure.
The damping spool combination damping hole of design, it can improve speed limit performance.
In above-mentioned anti-leak speed limit relief arrangement, the surface seal structure includes being arranged on fuel outlet valve in-core endAnnular protrusion, first annular face is equipped with the inner side of ring-type interior protuberance, is had and first ring in the outer end of annular protrusionThe second mutually identical ring surface of shape face.
In above-mentioned anti-leak speed limit relief arrangement, Gask-O-Seal is equipped with the inside of the annular protrusion, it is describedIt is annular inner conical surface that first annular face, which is arranged on Gask-O-Seal away from one end of annular protrusion and the first annular face, describedSecond ring surface is the taper surface coincideing with the annular inner conical surface.
In above-mentioned anti-leak speed limit relief arrangement, the internal diameter of the Gask-O-Seal is more than the interior of ring-type interior protuberanceFootpath.
In above-mentioned anti-leak speed limit relief arrangement, the damping spool outer end is equipped with Blind locating holes, and describedThree spring the inners insert in Blind locating holes and act on the bottom of Blind locating holes.
In above-mentioned anti-leak speed limit relief arrangement, the damping hole axial line and the Blind locating holes axle centerLine overlaps.
In above-mentioned anti-leak speed limit relief arrangement, the filtration includes filter screen, is set in the reamingIt is useful for preventing the axial positioning structure that the filter screen moves axially.
In above-mentioned anti-leak speed limit relief arrangement, it is arranged with the valve rod of draining the oil and connects with exocoel inner wall sealingThe movable sealing structure connect.
In above-mentioned anti-leak speed limit relief arrangement, the exocoel internal diameter is more than the internal diameter of inner cavity chamber.
In above-mentioned anti-leak speed limit relief arrangement, tubular valve seat the inner outer wall of draining the oil is equipped with external screw thread.
Compared with prior art, it is the advantages of this anti-leak speed limit relief arrangement：
1st, the effect of second spring is cooperateed with by surface seal structure, it may insure the leakproofness in low-pressure.
The effect of second spring and the 3rd spring, it may insure the elastic force of each spring, avoids due to lengthIt is longer to cause the problem of elastic force is inadequate or elasticity is poor.
2nd, the damping spool combination damping hole of design, it can improve speed limit performance..
3rd, it is simple in structure and easily fabricated.
Brief description of the drawings
Fig. 1 is structure diagram provided by the invention.
Fig. 2 is configuration schematic diagram provided by the invention.
Fig. 3 is enlarged structure schematic diagram at A in Fig. 1.
Fig. 4 is damping valve core structure schematic diagram provided by the invention.
Fig. 5 is installment state schematic diagram provided by the invention.
In figure, tubular is drained the oil valve seat 1, ring-type interior protuberance 11, the first oilhole 12, the first spring 13, reaming 14, the second oilhole15th, external screw thread 16, limited step 17, the first sealing ring 18, the second sealing ring 19, valve rod 2 of draining the oil, taper platform 21, sealing circle body22nd, drain the oil spool 3, annular spacer 4, second spring 5, surface seal structure 6, annular protrusion 61, first annular face 62, the second ringShape face 63, Gask-O-Seal 64, damping spool 7, damping hole 71, the first hole 711, taper hole body 712, the second hole the 713, the 3rdSpring 8, filter screen 9, baffle ring 91.
Embodiment
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
As shown in Figs. 1-2, this anti-leak speed limit relief arrangement is drained the oil valve seat 1 including tubular, inner in tubular valve seat 1 of draining the oilOuter wall is equipped with external screw thread 16.
Secondly, it is equipped with limited step 17 at the tubular middle part of valve seat 1 of draining the oil, limited step can avoid tubular from draining the oil valve seat 1Excessively installation.
In addition, it is arranged with the first sealing ring 18 in limited step 17 at the tubular middle part of valve seat 1 of draining the oil.Limited stepLimiting slot is formed between 17 and the outer end of external screw thread 16, the first sealing ring 18 is located in limiting slot.
By above-mentioned structure design, it can improve installation effectiveness, at the same time it can also further improve installation after connectThe leakproofness at place.
Annular positioning groove is equipped with the outer end outer wall that tubular drains the oil valve seat 1 and is arranged in annular positioning groove second is closeSeal 19.
Tubular drain the oil valve seat 1 inner wall in the middle part of be equipped with ring-type interior protuberance 11 and ring-type interior protuberance 11 tubular drained the oil valve seatIt is separated into exocoel and inner cavity chamber inside 1, the internal diameter of ring-type interior protuberance 11 is less than tubular and drains the oil the internal diameter of valve seat 1.
Exocoel internal diameter is more than the internal diameter of inner cavity chamber.
The inner side of ring-type interior protuberance 11 has annular inclined-plane, has outer ring inclined-plane in the outside of ring-type interior protuberance 11,And the annular inclined-plane and outer ring inclined-plane are symmetrical arranged.By setting outer ring inclined-plane, it can be improved into fuel-displaced effectRate, i.e. play the role of water conservancy diversion.
The present apparatus inserts in the exocoel indoor valve rod 2 and draining the oil in tubular of draining the oil including one end and is equipped with valve seat 1 and exocoelFirst oilhole 12 of connection, the first oilhole 12 has several and even circumferential is distributed.In the inner for valve rod 2 of draining the oil and ring-type convexIt is equipped between portion 11 and is located at indoor first spring 13 of exocoel.
Secondly, taper platform 21 and the axial line for valve rod 2 of draining the oil and the axial line of taper platform are equipped with the inner for valve rod 2 of draining the oilOverlap.By setting taper platform, its being inserted in order to the first spring 13, meanwhile, when which can also reduce mobileResistance.
In addition, in the movable sealing structure that is arranged with valve rod 2 and is connected with exocoel inner wall sealing of draining the oil.Movable sealing structure bagInclude the sealing circle body 22 for being arranged on the sealing ring locating slot at the middle part of valve rod 2 of draining the oil and being arranged in sealing ring locating slot.
Outer end is equipped with inner cavity chamber can insert in spool 3 of draining the oil in ring-type interior protuberance 11, and be set in the middle part of inner cavity chamberThere is the annular spacer 4 for being threadedly coupled with inner cavity chamber and inner cavity chamber being separated into preceding sub-chamber and rear sub-chamber, i.e. annularThe inside of separator 4 has through hole, can connect preceding sub-chamber with rear sub-chamber.
The inner of annular spacer 4 is equipped with well.
The second spring 5 in preceding sub-chamber is equipped between the inner of annular spacer 4 and spool 3 of draining the oil and is being putSurface seal structure 6 is equipped between the rear end of fuel tap core 3 and ring-type interior protuberance 11.
As shown in figs. 1 and 3, specifically, surface seal structure 6 here includes being arranged on the inner convex annular of spool 3 of draining the oilPortion 61, first annular face 62 is equipped with the inner side of ring-type interior protuberance 11, is had and described first in the outer end of annular protrusion 61The second mutually identical ring surface 63 of ring surface 62.
Gask-O-Seal 64 is equipped with the inner side of annular protrusion 61, the first annular face 62 is arranged on Gask-O-Seal 64One end and the first annular face 62 away from annular protrusion 61 are annular inner conical surface, second ring surface 63 be with it is describedThe taper surface that annular inner conical surface coincide.
The outer end of Gask-O-Seal 64 has the cooperation inclined-plane coincideing with the annular inclined-plane, passes through setting for inclined-planeMeter, it may insure to be installed in place, at the same time it can also expand contact area, it is ensured that the structural stability after assembling.
The internal diameter of Gask-O-Seal 64 is more than the internal diameter of ring-type interior protuberance 11.
Sealed by contact of the face with face, it can improve sealing effect, and by the design of two springs, it may insureThe elastic force of second spring 5 when pressure is low, design is more reasonable and avoids leakage.
Reaming 14 and the second oilhole 15 for being connected with the reaming are equipped with the drain the oil inner inner wall of valve seat 1 of tubular,The damping spool 7 that can be moved axially along reaming 14 is equipped with reaming 14 and filtration is equipped with the aperture of reaming 14,Specifically, which includes filter screen 9, is equipped with the reaming and is used to prevent what the filter screen 9 from moving axiallyAxial positioning structure.
Axial positioning structure includes being arranged on the baffle ring 91 in reaming and outside 9 both ends of the surface of filter screen.The filtering of settingStructure, it may insure to enter to the oil quality in device, meanwhile, which also has the function that to stop, can be to avoidSpool 7 is damped to reaming aperture to depart from.
Damping hole 71 is equipped with the axial centre of damping spool 7 and when after oil is entered to from filtration in sub-chamberThe damping spool 7 closes the second oilhole 15, and the 3rd spring 8 is equipped between annular spacer 4 and damping spool 7.
Further, Blind locating holes 72 are equipped with 7 outer end of damping spool, described 8 the inner of the 3rd spring inserts in positioning blindIn hole 72 and act on the bottom of Blind locating holes 72.
Secondly, 71 axial line of damping hole is overlapped with 72 axial line of Blind locating holes.
As shown in figure 4, damping hole 71 includes the first hole connected with Blind locating holes 72, the cone connected with the first hole 711Shape hole body 712, and the second hole 713 connected with taper hole body, the internal diameter in the first hole are more than the internal diameter in the second hole.
As shown in Figs. 1-5
The present embodiment has two states
The first is light condition；Second is load condition.
When empty, valve rod 2 of draining the oil at this time moves inward drains the oil between spool 3 and ring-type interior protuberance 11 so as to cancelSealing, and oil at this time is entered in rear sub-chamber from 71 and/or second oilhole 15 of damping hole, realizes quick relief.
When load condition, with the continuous increase of pressure, damping spool 7 closes the second oilhole 15, then oil passes through ringShape separator 4 and ring-type interior protuberance 11, and discharged from the first oilhole 12.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is ledThe technical staff in domain can do various modifications or additions to described specific embodiment or replace in a similar wayGeneration, but without departing from spirit of the invention or beyond the scope of the appended claims.