CN202579156U - Reversing valve and manual hydraulic pump with same - Google Patents

Abstract

The utility model discloses a reversing valve and a manual hydraulic pump with the same. According to the technical scheme, the reversing valve comprises a valve body; a hole cavity A, a hole cavity B and a hole cavity C with different distribution angles are communicated with one another and arranged along the radial direction of the valve body in a same section position by taking a radial section of the valve body as a reference; the circumferential surface of the valve body is provided with an annular oil groove, and the annular oil groove and the hole cavities A, B and C are located on different sections of the valve body; with a direction of rotating the reversing valve from an ascending position to a descending position being taken as a reference, a pressure relief groove is arranged on the circumferential surface between the hole cavity B and the hole cavity C; an oil returning groove is arranged on the circumferential surface between the hole cavity A and the hole cavity B; and the pressure relief groove and the oil returning groove are respectively communicated with the annular oil groove. As the reversing valve adopts a sealing manner combining rigidity and flexibility, a sealing sleeve is not easy to be rubbed by hole openings, the sealing performance is good, and the durability is high.

Description

A kind of selector valve and install the hydraulic hand-pump of this selector valve

Technical field

The utility model relates to a kind of hydraulic overturn lowering or hoisting gear that is used for lifting automobile cab or similar device, is the hydraulic hand-pump that is used to provide power in the hydraulic overturn lowering or hoisting gear specifically, particularly relates to the selector valve of this oil hydraulic pump.

Background technique

Known; If automobile cab need overturn than wide-angle, particularly climb under the situation of center of gravity, operator cabin can not rely on deadweight to descend; Need a kind of two circuit hydraulic overturn lowering or hoisting gear, utilize the hydraulic cylinder piston rod retraction to drive operator cabin and climb over center of gravity realization decline.

In the existing technology, for this double loop hydraulic turning lifting device provides the hydraulic hand-pump of power to comprise fuel tank, the pump housing; (selector valve is in engineering practice here, and those skilled in the art are also referred to as distributing valve, reversing shaft, distribution shaft etc., and its essence is identical to be integrated in plunger, selector valve in the pump housing; Only be that title changes; As follows) etc., the sealing between its middle pump body and the switching-over valve opening system is a key point, adopts rigid seal or flexible sealing usually.Rigid seal requires very high to the quality of fit between the pump housing and the selector valve, not only the component processing and assembling is with high costs, is difficult to reach quality requirement, and the relative wear in the middle of using is difficult to repair, and lets out in easily; The good sealing effect of flexible sealing, but use the short period oil hydraulic pump will decompression or leakage of oil, durability is bad.

Model utility people has anatomized the defect cause of existing technology.As shown in Figure 1 is selector valve radial cross-section in the existing technology, and selector valve has an annular groove 104 along the valve body circumference; The same radial cross section of valve body has the different A vestibule 12 of distribution angle, B vestibule 13 and C vestibule 14 and joins connection mutually at spool; Aforesaid switching-over valve opening is all to be arranged among the annular groove 104.Said hole is all to offer into step hole, the stuffing box gland 15 of installing one hollow and exterior edge face camber in the macropore, and its bottom is propped up by O-ring seals 16; Switching-over valve opening system and sealing between the pump housing are to rely on tight between stuffing box gland and the pump housing wall to contact realization; Because the existence of annular groove 104 and O-ring seals 16 are in the supporting effect of bottom; Stuffing box gland 15 must be given prominence to an aperture part, is conducting or when separating, the seamed edge or the orifice of pump housing hole system must scratch stuffing box gland 15 when selector valve rotation makes its hole system and pump housing hole; Stuffing box gland 15 adopts nonmetallic engineering plastics to be made usually; Be easy to damage stuffing box gland 15, as long as and have a stuffing box gland impaired in the switching-over valve opening system, will cause oil hydraulic pump decompression or leakage of oil; The hydraulic hand-pump of existing technology that Here it is is short service time, the main reason that durability is bad; Secondly this selector valve is not because the existence of annular groove 104 even if between the selector valve and the pump housing be accurate Spielpassung, has rigid seal between the switching-over valve opening system and the pump housing yet; Its sealing must rely on stuffing box gland fully; Sealing means is single, so arbitrary stuffing box gland 15 is impaired, whole oil hydraulic pump had just lost efficacy; This also is that hydraulic hand-pump is short service time, the secondary cause that durability is bad.

Because it is to adopt differential circuit that the oil hydraulic cylinder of this double loop turning lifting device rises; For guaranteeing safety; One fluid-control one-way control valve unit when decompression (be used for that oil hydraulic cylinder is in lifting position and stop oil hydraulic cylinder to descend) is arranged between cavity of resorption oil nozzle joint 36 and oil hydraulic cylinder cavity of resorption; Have only selector valve switching-over back to oil hydraulic cylinder epicoele (rod chamber) people for after suppressing setup pressure value, Pilot operated check valve just can be opened.So before oil hydraulic cylinder cavity of resorption and the conducting of decline return line; Must be the pressure releasing in oil hydraulic cylinder epicoele and the pipeline; Thereby keep the fluid-control one-way control valve unit to be in closed condition, otherwise have pressure in the pipeline, can after the selector valve switching-over, back down the automatic conducting decline of fluid-control one-way control valve unit loop; Cause the decline of upender moment impact property, jeopardize safety.The pressure release design of existing technology is to open an annular groove 104 along the change valve circumference, and switching-over valve opening system all is arranged among the annular groove 104, and pump housing hole system is also corresponding within annular groove 104 scopes; Annular groove 104 cooperated formation one annular drainback passage when selector valve was assembled into one with the pump housing with the pump wall; When selector valve is turned in the lowering position process by lifting position; Switching-over valve opening system contacts and seals with pump housing wall; Lumen pore section 33 is fastened in the pump housing hole that is communicated with the oil hydraulic cylinder upper and lower cavity, lumen pore section 32 is through annular drainback passage and 31 conductings of pump housing return opening down, and moment is realized pressure release, in decline rotated position process, makes the fluid-control one-way control valve unit be in closed condition at selector valve.

Summary of the invention

Through analyzing, the design deficiency that existing technology exists is: designed switching-over valve opening system in order to realize the pressure release function and be opened among the annular groove, thereby caused the stuffing box gland projection and scratched easily and commutate can't rigid seal between the valve opening system and the pump housing.The utility model is exactly the further improvement of making to the technical problem of the defective of aforementioned existing technology and existence.

The primary technical problem that solves of the utility model provided a kind of its hole system can and the pump housing between realize the selector valve that is applicable to the double loop hydraulic pump of rigid seal.

The technological scheme that the primary technical problem that solves the utility model adopts is: selector valve comprises valve body; With its radial cross section is reference, and in the same cross-sectional position, the said valve body in edge radially offers and is interconnected but the different A vestibule of distribution angle B vestibule, C vestibule; Said valve body circumferential surface offers an annular oil groove, itself and A vestibule, and B vestibule, C vestibule are positioned on the different cross sections; Is reference by lifting position toward decline rotated position direction with selector valve; Have a gas pressure relief slot from the B vestibule to the circumferential surface the C vestibule; Have an oil-return groove from the A vestibule to the circumferential surface the B vestibule, said gas pressure relief slot, oil-return groove are communicated with said annular oil groove respectively.

The technique effect of the utility model is: the annular groove that plays the pressure release effect in the existing design has at first been cancelled in new design; Thereby make valve body hole system directly be opened in circumferential surface; For the rigid seal between the switching-over valve opening system and the pump housing has been created condition; Being opened in the hole to the annular groove that plays logical functional oil then is side, increase to offer gas pressure relief slot and oil-return groove, thereby the pressure release " function " that does not promptly influence selector valve has realized rigid seal between the switching-over valve opening system and the pump housing again.

Bright to further releasing of " being reference by lifting position toward decline rotated position direction with selector valve; have a gas pressure relief slot from the B vestibule to the circumferential surface the C vestibule, have an oil-return groove from the A vestibule to the circumferential surface the B vestibule ": can be with reference to Fig. 5 for the ease of explanation." rotation " of so-called selector valve; Must be for certain reference point beyond the selector valve; We suppose to exist beyond the selector valve so fixing reference point Z; " by the B vestibule to the circumferential surface the C vestibule " should be when selector valve " rotation " so, and the center line of " B vestibule " is introduced into or through reference point Z, and a part of then circumferential surface gets into or through reference point Z successively; The center line of " C vestibule " gets into or through reference point Z at last, aforementioned get into successively or through reference point Z and be positioned at " B vestibule " and " C vestibule " between this part circumferential surface have " circumferential surface " of " gas pressure relief slot " exactly.So when the selector valve sense of rotation is confirmed, and, be clear and definite and unique its this part " circumferential surface " that limits in " B vestibule " and " C vestibule " entering or under through the definite situation of the sequencing of reference point Z; In like manner " from the A vestibule to the circumferential surface the B vestibule " also is clear and definite and unique.

Technical problem that the utility model secondly solves has provided that a kind of rigid seal and flexible sealing combine, and can to avoid flexible gland be the selector valve that is applicable to the double loop hydraulic pump that scratches by pump housing hole.

The technological scheme that the less important technical problem that solves the utility model adopts is: selector valve comprises valve body; With its radial cross section is reference, and in the same cross-sectional position, the said valve body in edge radially offers and is interconnected but the different A vestibule of distribution angle B vestibule, C vestibule; Said valve body circumferential surface offers an annular oil groove, itself and A vestibule, and B vestibule, C vestibule are positioned on the different cross sections; Is reference by lifting position toward decline rotated position direction with selector valve; Have a gas pressure relief slot from the B vestibule to the circumferential surface the C vestibule; Have an oil-return groove from the A vestibule to the circumferential surface the B vestibule, said gas pressure relief slot, oil-return groove are communicated with said annular oil groove respectively; Said A vestibule, B vestibule and C vestibule are all offered into step hole, and wherein the macropore section is installed hollow and exterior edge face stuffing box gland in the arc-shaped, and its bottom is propped up by O-ring seals.

The further technique effect of the utility model is: because new design has the rigid seal function, and at the A vestibule, the B vestibule; After the C vestibule installing stuffing box gland; Making not only has rigid seal to also have flexible dynamic seal (packing) between the selector valve and the pump housing, the double-sealing of its formation not only makes sealing effect better, and arbitrary sealing means lost efficacy; Also have another sealing effect to guarantee that hydraulic pump works is normal, obviously durability is better; Secondly; The accurate Spielpassung of the selector valve vestibule and the pump housing; Its exterior edge face was limited by pump housing wall among stuffing box gland was installed in vestibule, can not stretch out the aperture, had avoided the seamed edge or the orifice of pump housing hole system to scratch stuffing box gland; Thereby make the oil hydraulic pump durability better, prolonged the working life of oil hydraulic pump greatly.

Further optimal technical scheme: said oil-return groove is a breach that forms along the axial one section circumferential surface of excision of valve body.

Further technique effect: there is not trough rim up and down with the oil-return groove of the tangent formation of circumferential surface, through the processing rounding, can scratch pump housing hole wall when cooperating with pump housing hole system, thus the hole wall of having protected pump housing hole to be helps the rigid seal of the pump housing.

Further optimal technical scheme: on radial cross section, said oil-return groove position and gas pressure relief slot be not on identical diameter line, and said oil-return groove is arranged on the diameter line identical with the C vestibule.

Further technique effect: oil-return groove is arranged in A vestibule and B vestibule neutral position, guarantees that oil-return groove and gas pressure relief slot can be not conducting simultaneously with pump housing hole.

Further optimal technical scheme: it is corresponding with pump housing return opening that said annular oil groove is offered the position.

Further technique effect: this design remains annular oil groove and pump housing return opening is on state.

Further optimal technical scheme: it is diameter that said gas pressure relief slot radial width is slightly larger than pump housing hole.

Further optimal technical scheme: said gas pressure relief slot radial width and pump housing hole are that diameter is suitable.

Further technique effect: this gas pressure relief slot width design is guaranteeing that hydraulic oil under the flow in the middle of the system of hole, situation that speed reaches designing requirement, reduces to offer area as far as possible and helps the rigid seal between the selector valve and the pump housing.

The 3rd technical problem that the utility model solves has provided a kind of the switching-over can realize the hydraulic hand-pump of rigid seal between the valve opening system and the pump housing.

The technological scheme that the 3rd technical problem that solves the utility model is adopted is: hydraulic hand-pump comprises the pump housing, pump housing return opening, last lumen pore section, following lumen pore section, pump housing filler opening; This hydraulic hand-pump is equiped with aforementioned newly-designed selector valve; The said lumen pore section that goes up, following lumen pore section, pump housing filler opening correspondence is on the rotate path at valve body hole; The rotate path of the corresponding annular oil groove of said pump housing return opening.

Further technique effect: because newly-designed switching-over valve opening system is opened in the valve body circumferential surface, the accurate Spielpassung of the valve body and the pump housing realizes rigid seal between the selector valve and the pump housing.

The 4th technical problem that the utility model solves has provided between a kind of selector valve and the pump housing can realize the hard and soft sealing that combines, and stuffing box gland is difficult for being scratched the better hydraulic hand-pump of durability by pump housing hole system.

The technological scheme that the 4th technical problem that solves the utility model adopts is: hydraulic hand-pump comprises the pump housing, pump housing return opening, last lumen pore section, following lumen pore section, pump housing filler opening; This hydraulic hand-pump is equiped with aforementioned newly-designed selector valve; The said lumen pore section that goes up, following lumen pore section, pump housing filler opening correspondence is on the rotate path at valve body hole; The rotate path of the corresponding annular oil groove of said pump housing return opening; Said A vestibule, B vestibule and C vestibule are all offered into step hole, and wherein the macropore section is installed the stuffing box gland of hollow and exterior edge face camber, and its bottom is propped up by O-ring seals.

Further technique effect: thus switching-over valve opening system installing stuffing box gland realizes that with the pump housing hard and soft sealing combines; Stuffing box gland is limited among the vestibule by pump housing wall, has avoided stuffing box gland to be scratched by pump housing hole system, makes this hydraulic hand-pump better tightness; Durability is better, longer service life.

Description of drawings

Fig. 1 is the radially sectional structure schematic representation of existing technology selector valve.

Fig. 2 is the surface structure schematic representation that the utility model and the pump housing are assembled together.

Fig. 3 is the A-A sectional structure schematic representation of Fig. 2.

Fig. 4 is the utility model embodiment one a surface structure schematic representation.

Fig. 5 is the C-C sectional structure schematic representation of Fig. 4.

Fig. 6 is one of B-B partial sectional view of Fig. 3, is the matching relationship of the utility model and pump housing hole when being in lifting position system.

Fig. 7 be Fig. 3 the B-B partial sectional view two, the matching relationship of when being the utility model pressure release state and pump housing hole system.

Fig. 8 be Fig. 3 the B-B partial sectional view three, be the matching relationship of the utility model and pump housing hole when being in lowering position system.

Fig. 9 is the utility model embodiment two a surface structure schematic representation.

Figure 10 is the D-D sectional structure schematic representation of Fig. 9.

10. valve body, 11. annular oil grooves, 12.A vestibule, 13.B vestibule, 14.C vestibule, 15. stuffing box glands, 16.O shape seal ring, 17. gas pressure relief slots, 18. oil-return grooves.

20. upper valve body, 21. one-way valves.

30. the pump housing, 31. pump housing return openings, 32. times lumen pore sections, lumen pore section on 33., 34. pump housing filler openings, 35. epicoele oil nozzles, 36. cavity of resorption oil nozzles.

40. plunger.

50. fuel tank.

104. annular groove.

Embodiment

Elaborate below in conjunction with the embodiment of accompanying drawing to the utility model, the advantage of further illustrating the utility model reaches the contribution with respect to existing technology.Understandable, following embodiment should not be construed as the restriction to technological scheme of the present invention.

Embodiment one:

Like Fig. 2, be oil hydraulic pump overall appearance structural representation and A-A sectional structure chart shown in 3.The pump housing 30 is partially integrated in fuel tank 50 inside, selector valve, and plunger 40 grades are integrated in the pump housing 30 inside.There are pump housing return opening 31, following lumen pore section 32 in pump housing hole system, go up lumen pore section 33, pump housing filler opening 34; Pump housing filler opening 34 is communicated with fuel tank 50 through upper valve body 20; Following lumen pore section 32 is communicated with cavity of resorption oil nozzle that is threaded in outer end, the pump housing 30 bottom 36 and epicoele oil nozzle 35 respectively with last lumen pore section 33, is communicated with oil hydraulic cylinder (not shown) epicoele (rod chamber) and cavity of resorption (rodless cavity) through high-pressure oil pipe; Hydraulic oil gets into valve body 10 through upper valve body 20, pump housing filler opening 34, and said upper valve body 20 spools are provided with one-way valve 21 and are used to stop hydraulic oil to reflux.

Like Fig. 4, be the sectional structure chart of selector valve surface structure schematic representation and valve body hole system shown in 5.Change valve 10 is whole to become cylindrical, in same sectional position, radially offers A vestibule 12 along valve body 10, B vestibule 13, and C vestibule 14 and intersect at spool is communicated with; C vestibule 14 and adjacent A vestibule 12, B vestibule 13 is 90 ° of angles roughly; A vestibule 12, B vestibule 13, C vestibule 14 is all offered into step hole, and the stuffing box gland 15 of exterior edge face camber cooperates with the intersegmental crack of macropore, and its bottom is propped up by O-ring seals 16, and stuffing box gland 15 hollow spaces and aperture section form hydraulic oil channel.Can clearly find out among the figure; Be accurate Spielpassung between the selector valve and the pump housing 30; Valve body hole system directly opens the circumferential surface at valve body 10, and stuffing box gland 15 is limited within the macropore section of valve body hole system by the hole wall of the pump housing 30 under by the support of O-ring seals 16, so not only has the sealing of hard and soft combination; And selector valve is when rotating, and stuffing box gland can not scratched and damage by the seamed edge of pump housing hole system.Valve body hole ties up in the semicircle of radial circumference and roughly evenly distributes; As long as this design make arbitrary valve body hole system turn to correct position just can with following lumen pore section 32, last lumen pore section 33,34 conductings of pump housing filler opening; Side in valve body hole system has an annular oil groove 11, and pump housing return opening is just in time on its rotation path.Circumferential surface between B vestibule 13 to the C vestibules 14 has the gas pressure relief slot 17 that is communicated with annular oil groove 11; Its radial width is slightly larger than the diameter of pump housing hole system; So not only guarantee the hydraulic fluid flow rate demand but also satisfied that to offer area less, helped the rigid seal of the valve body and the pump housing; The degree of depth of gas pressure relief slot 17 and width can accurately be offered according to the design discharge that the oil hydraulic pump needs satisfy.Oil-return groove 18 is breach that form along valve body 10 axial one section circumferential surface of excision; The one of which end is communicated with annular oil groove 11; This radially do not have trough rim with the oil-return groove 18 tangent formation of valve body radial circumference; With breach jointing place rounding, can not scratch the aperture seamed edge when making it to intersect with pump housing hole system, help the rigid seal between the selector valve and the pump housing 30; Oil-return groove 18 also can be split into flute profile, but owing to radially trough rim is arranged, so there is not present embodiment preferred.Because upper and lower lumen pore section 33,32 is arranged on the same axis; As shown in Figure 5; The layout of oil-return groove 18 will be avoided being positioned at the position on the same diameter line with gas pressure relief slot 17, and present embodiment is arranged in the neutral position of A vestibule 12 and B vestibule 13, promptly is tied to form 90 ° of angles with adjacent holes; With 14 one-tenth 180 ° of angles of C vestibule, guarantee that like this return opening 18 and gas pressure relief slot can be not conducting with pump housing hole simultaneously.

As shown in Figure 6 and combine Fig. 3, selector valve is in lifting position, A vestibule 12 and following lumen pore section 32 conductings; B hole section 13 and last lumen pore section 33 conductings, C hole section 14 and 34 conductings of pump housing filler opening are shaken plunger 40; Hydraulic oil gets into C vestibule 14, one road warp through upper valve body 20, pump housing filler opening 34, and lumen pore section 32 is to the oil hydraulic cylinder cavity of resorption down, and one the tunnel through last lumen pore section 33 entering oil hydraulic cylinder epicoeles; After force value reached setting value in the pipeline, fluid-control one-way control valve unit (not shown) was opened, oil hydraulic cylinder upper and lower cavity conducting simultaneously pressure oil; Thereby the formation differential circuit is realized the quick lifting of operator cabin.When stopping swinging plunger 40 or up plunger 40, the fluid-control one-way control valve unit is in closed condition.

As shown in Figure 7 and combine Fig. 3, selector valve is by rotation counterclockwise, by lifting position to the decline rotated position; Last lumen pore section 33 and Decompression valves 17 conductings, valve body hole system contacts with pump housing wall, and the pressure of oil hydraulic cylinder epicoele is through last lumen pore section 33; Decompression valves 17, annular oil groove 11,31 moments of pump housing return opening release; This moment, Pilot operated check valve was closed, and oil hydraulic cylinder keeps state of rest.

As shown in Figure 8 and combine Fig. 3, selector valve to continue by rotation counterclockwise, A vestibule 12 and 34 conductings of pump housing filler opening, C vestibule 14 and last lumen pore section 33 conductings, oil-return groove 18 and following lumen pore section 32 conductings, drain pan 17 contacts with pump housing wall; Shake plunger 40, hydraulic oil gets into the oil hydraulic cylinder epicoeles through A vestibule 12, C vestibule 14, last lumen pore section 33; Cavity of resorption hydraulic oil warp is lumen pore section 32, oil-return groove 18, annular oil groove 11 down, and pump housing return opening 31 returns fuel tank 50, realizes that operator cabin climbs over center of gravity and descends.

Present embodiment employing rigid seal combines with flexible dynamic seal (packing), and stuffing box gland is limited in inside, distribution shaft aperture by pump housing wall, the difficult aperture scratch that is by pump housing hole, thereby realization oil hydraulic pump better tightness, more durable technical purpose.

Embodiment two:

Present embodiment and embodiment's one difference are that the design of A, B, C vestibule 12,13,14 is different; Like Fig. 9, shown in 10; A, B, C vestibule 12,13,14 are directly offered into the consistent through hole of radial cross section but not step hole; And do not install stuffing box gland additional, distributing between the axis hole system and the pump housing is the rigid seal of precision-fit fully.The present embodiment sealing means is single, and it is preferred to be not so good as embodiment one.

Claims (9)

1. a selector valve comprises valve body (10); With its radial cross section is reference, and in the same cross-sectional position, the said valve body in edge (10) radially offers and is interconnected but the different A vestibule (12) of distribution angle B vestibule (13), C vestibule (14); It is characterized in that: said valve body (10) circumferential surface offers an annular oil groove (11), itself and A vestibule (12), and B vestibule (13), C vestibule (14) is arranged on the different cross sections; Is reference by lifting position toward decline rotated position direction with selector valve; Have a gas pressure relief slot (17) from B vestibule (13) to the circumferential surface the C vestibule (14); Have an oil-return groove (18) from A vestibule (12) to the circumferential surface the B vestibule (13), said gas pressure relief slot (17), oil-return groove (18) are communicated with said annular oil groove (11) respectively.

2. selector valve according to claim 1; It is characterized in that: said A vestibule (12), B vestibule (13) and C vestibule (14) are all offered into step hole; Wherein the macropore section is installed hollow and exterior edge face stuffing box gland (15) in the arc-shaped, and its bottom is propped up by O-ring seals (16).

3. selector valve according to claim 1 and 2 is characterized in that: on radial cross section, said oil-return groove (18) position and gas pressure relief slot (17) be not on identical diameter line.

4. selector valve according to claim 1 and 2 is characterized in that: on radial cross section, said oil-return groove (18) is arranged on the diameter line identical with C vestibule (14).

5. selector valve according to claim 1 and 2 is characterized in that: said oil-return groove (18) is one and axially excises one section circumferential surface and the breach that forms along valve body (10).

6. selector valve according to claim 1 and 2 is characterized in that: it is corresponding with pump housing return opening (31) that said annular oil groove (11) is offered the position.

7. selector valve according to claim 1 and 2 is characterized in that: said gas pressure relief slot (17) radial width and pump housing hole are that diameter is suitable.

8. hydraulic hand-pump comprises the pump housing (30), pump housing return opening (31), last lumen pore section (32), following lumen pore section (33), pump housing filler opening (34); It is characterized in that: this hydraulic hand-pump is equiped with selector valve as claimed in claim 1.

9. hydraulic hand-pump according to claim 8; It is characterized in that: said A vestibule (12), B vestibule (13) and C vestibule (14) are all offered into step hole; Wherein the macropore section is installed hollow and exterior edge face stuffing box gland (15) in the arc-shaped, and its bottom is propped up by O-ring seals (16).

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