US3639092A - Apparatus for converting hydraulic or pneumatic energy into kinetic energy or vice versa, such as a rotary multichamber vane-type motor or pumps - Google Patents

Apparatus for converting hydraulic or pneumatic energy into kinetic energy or vice versa, such as a rotary multichamber vane-type motor or pumps Download PDF

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US3639092A
US3639092A US889353A US3639092DA US3639092A US 3639092 A US3639092 A US 3639092A US 889353 A US889353 A US 889353A US 3639092D A US3639092D A US 3639092DA US 3639092 A US3639092 A US 3639092A
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vane
pressure
source
communication
housings
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US889353A
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Gaston Sauvaget
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3446—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor

Definitions

  • An inner element carrying slid- Dec. 3 1968 France ing vanes is mounted in an outer element defining a plurality of recesses defining variable-volume chambers with the easier element and the vanes.
  • the elements are relatively rotatable.
  • Inlet and outlet conduits are provided in the inner element on ⁇ 52] U.S. ....4l8/l75, 418/186, 4l8/249,
  • Means including a distributor valve put independent groups of said inlet and for outlet conduits in 0 6 N8 1 1 m5 2 m9 "4 2 m5 7 1 I n/ "00 l Mn c r "a 8 S M d Ld hF UN 55 communication with a high-pressure fluid source or a lowpressure fluid source.
  • Means connect the housings to a source of fluid under pressure.
  • Rotary hydraulic motors or pumps have also been described, in particular, in German Pats. Nos. 733,050 (Calzoni), l,2l5,532 (Hartmann Manufacturing Co.), in which a distributor valve is provided to put a variable number of work chambers in communication with the high-pressure fluid source and thus vary the speed or change the direction of rotation.
  • variablespeed converters are, however, very different from the type defined hereinbefore and are incapable of affording a relatively high number of speeds with low fatigue of the parts, high efficiency, and regular vibration-free operation.
  • the object of the invention is to provide a converter of the type defined hereinbefore with which it is possible to vary the torque and the speed of the rotor inversely and reverse the direction of rotation, the converter having a much simpler structure than that of know, multispeed motors or pumps and affording all the aforementioned advantages.
  • the various inlet conduits of the inner element and/or the various outlet conduits are divided into at least two independent groups which are connectable to a high-pressure fluid source (inlet in the case of a motor and outlet in the case of a brake or pump) and to a low-pressure fluid source (inlet in the case ofa brake or pump and outlet in the case of a motor) through a distributor valve whereby each of the groups of conduits can be put independently in communication with the highpressure fluid source or with the lowpressure fluid source.
  • a vane may be rendered inoperative by placing its inlet and outlet conduits in communication with the high-pressure source. if the pressure in the housing has a value not exceeding the value of the pressure. It is then merely necessary to put one of the outlet or inlet conduits in communication with the low-pressure with no need to change the pressure P, to render the vane operative and cause the apparatus to operate as a pump or motor, as the case may be.
  • the blade housings are also divided into at least two groups, in the same way as the inlet and/or outlet conduits of these vanes, and these groups are connected to a high-pressure source and a source of lower pressure, for example the low-pressure source, through a distributor valve whereby each of these groups of housings can be put independently in communication with either fluid source.
  • its inlet and outlet conduits are put in communication with the high-pressure source at the same time that its housing is put in communication with the low-pressure source.
  • the pressure in the housing must be raised and made equal, for example, to the high pressure value, and one of the inlet or outlet conduits must be put in communication with the low-pressure source.
  • a vane may be rendered inoperative by putting its inlet and outlet conduits in communication with the low-pressure source, if the pressure in the housing does not exceed that of the low-pressure source. But in this case to render the vane operative the pressure in the housing must be increased and made equal, for example, to the highpressure value. Consequently, in this embodiment also, the vane housings must be divided into two groups, the distributor valve enabling each of these housing groups to be put independently in communication with the low-pressure source and with a higherpressure source, for example with the high-pressure source.
  • one of its inlet and outlet conduits as well as its housing have merely to be put in communication with the high-pressure source.
  • vanes divided into three groups (four, two and two), four different speeds can be obtained.
  • 10 vanes divided into three groups (six, two and two), and with 12 vanes divided into three groups (six, four and two), five and six speeds can be obtained respectively.
  • the apparatus operates as a free wheel. Further, the direction of rotation of the rotor is reversed by reversing the connections of the inlet and outlet conduits to the highand low-pressure sources. Thus it is possible to obtain a motor with several rotational speeds in either direction. Lastly, the apparatus can act as a brake if the outlet is throttled, and as a locking device if this outlet is closed.
  • the rotor can comprise two sidewalls interconnected by crossmembers, an independent ring which has a small cross section and a substantially constant thickness and is interposed between the side walls, the profile of the ring having a corrugated shape so as to define recesses, and means comprising for example thrust screws or eccentrics carried by the crossmembers for exerting a thrust on the outer face of the ring between said recesses and thus reduce the inside diameter of the ring.
  • Each vane can consist of several adjoining plates with curved ends. It has been found that, in operation, fluid under high-pressure leaks from that part of the recesses connected to the inlet conduits into the chambers located between the curved ends of the plates and the inner wall of the outer element; fluid can also arrive in these chambers from the housings in which the vane plates are mounted. This fluid opposes correct application of the plates on the inner wall of the outer element and tends to render these plates inoperative.
  • the center plate has on each face a recess in communication with an aperture extending through the plate, each. assembly consisting of a recess and its aperture being in different planes and each end plate having an aperture facing the aperture of the center plate in communication with the recess on the face of this center plate in contact with the third plate.
  • the chamber or chambers in which the recess or recesses open are put in communication with the low-pressure and the high-pressure on each side of the generatrix line of contact of each of these plates firmly applied against the inner wall of the rotor.
  • FIG. I is a cross-sectional view of a motor
  • FIG. 2 is a sectional view taken along line IIII of FIG. I showing the distributor valve associated with the motor;
  • FIGS. 3 and 4 show two other positions of the distributor valve
  • FIG. 5 is a detail sectional view of a modification
  • FIG. 6 is a partial sectional view of a detail of a modification of the rotor
  • FIG. 7 is a sectional view taken along line VIIVII of FIG. 10, ofa detail of the motor having multiplate vanes;
  • FIG. 8 is a diagram illustrating the operation of the apparatus
  • FIG. 9 is a sectional view taken along line IXIX of FIG. I0, of a detail of the motor having multiplate vanes, and,
  • FIG. 10 is a side elevational view of the center plate of the multiplate vane shown in FIGS. 7 and 9.
  • the outer element is the rotor. It comprises two sidewalls I and 2 which are interconnected by a series of crossmembers 37. Disposed within the latter is an independent ring 38 having a wall of small section and substantially constant thickness. This ring has a corrugated profile so as to define the recesses 29.
  • the cross members 37 are provided with thrust screws 39 which have a fine pitch and exert a thrust on the outer face of the ring 38 between the inner recesses 29, that is, in the hollows of theouter recesses. These screws are locked by locknuts 40.
  • the inner profile of the ring can be modified so as to reduce the clearance between the rotor and the stator to a minimum in the regions between recesses 29.
  • annular member 10 which constitutes the stator and is disposed in ring 38, is movably mounted exactly on an eccentric part of a hub 9 which is concentric with the ring 38 so that it is prevented from rotating with respect to this hub.
  • the stator 10 is interposed between walls 1 and 2.
  • the hub 9 is fixed 5 in a support element 14 and extends from the latter.
  • the annular member 10 comprises, on its radially inner wall, five annular grooves, 410 and 41b, 42a and 42b and 43.
  • Annular grooves 41a and 41b are in communication with conduits 18a and 18b bored in the hub 9 for the passage of a pressure fluid; the annular grooves 42a and 42b are in communication with conduits 19a and 19b normally for the inlet when the device operates as a motor.
  • the annular groove 43 is in communication with a conduit 19' normally for the outlet when the device acts as a motor.
  • the inlet conduits are divided into two groups 250 and b; conduits 250, which are four in number, are in communication with groove 42a whereas the two other conduits 251; are in communication with groove 42b.
  • the pressure conduits supplying a pressure fluid to vane housings 24 are divided into two groups 44a and 44b; conduits 44a which correspond to the vane provided with the inlet conduits 25a, are in communication with groove 41a, whereas the two other conduits 44b are in communication with groove 41b.
  • Conduits 18a, 18b, 19a, 19b and 19' can be put in communication with a source 45 of high-pressure fluid at a pressure P, or with a source 46 of low-pressure fluid at a pressure P,. through a distributor valve generally designated by reference numeral 47.
  • This distributor valve comprises a body 48 in which is slidably mounted a slide valve assembly 49 which may occupy any one of four successive positions. By suitably positioning the slide valve assembly, it is possible to:
  • conduit 19a close or cut off conduit 19a or put it in communication with a conduit 50 connected to the fluid sources through a throttling cock 51 and a reversing cock 52 or with a manifold 53 connected to the reversing cock 52 through a conduit 54 and throttling cock 55;
  • conduit 19b close conduit 19b or put it in communication with a conduit 56 connected to conduit 50 or with manifold 53;
  • conduit 18b close conduit 18b or put it in communication with manifold 60, or manifold 63.
  • the latter can be put in communication with conduit 54 alone or with conduit 54 and manifold 57 through a three-way drain cock 64.
  • Reference numeral 65 designates a gorging circuit connected to manifold 57 through a nonreturn valve 66 which is so arranged as to allow circulation of the fluid, when the pressure downstream of the valve is lower than the gorging pressure.
  • Position I of the distributor valve is that shown in FIG. 3; position II is that shown in FIG. 2 and position I" is that shown in FIG. 4; in a position 0 (not shown) all the conduits are closed.
  • the normal position of cock 52 is that shown in FIG. 2, its other position being the reverse position.
  • the normal position of the purging cock is that shown in FIG. 2, its reverse position being that in which it puts manifold 63 in communication with conduit 54 and with manifold 57.
  • the motor is braked and is in first speed or gear, distributor valve 47 being in position I. It is also possible to brake in second or third speed, by bringing the distributor valve to position II or III, but the braking torque is then less.
  • the apparatus can function as a pump; a table similar to the foregoing can be drawn up, P and P, being simply interchanged in respect of conduits 44a and 44b.
  • the curve 78 shown in FIG. 8 shows the variation of .the motor torque (as ordinates) as a function of rotor speed abscissa] at different speeds. It can be seen that the power, which is represented by the curve 79, is constant.
  • the variations of pressure and flow rate, respectively, are also shown at 80 and 81. These curves show that different fluid thrust sections produce different torques for a given pressure and a'variation of speed for a given flow rate.
  • the apparatus described hereinbefore can therefore be fed by a pump having a capacity which is a third of that of a conventional apparatus.
  • FIG. 5 shows a modification in which the positions of valves 61 and 62 have been reversed.
  • the vanes are rendered inoperative in reverse operation by putting the three conduits pertaining to a vane in communication with the highpressure source (feed).
  • the thrust screws 39 have been replaced by eccentrics 67 integral with portions 68 which externally are shaped as hexagonal nuts.
  • the clearance between the stator and ring 38 can thus be easily regulated by turning the eccentric 67 by means of a spanner engaged on portion 68.
  • FIGS. 7, 9 and 10 show a vane comprising three indepen dent plates 23:1,2317 and 230.
  • the center plate 23b comprises, on one ofits faces, a recess 72:: which communicates with an aperture 69a, and, on its opposite face, a recess 7212 which communicates with an aperture 6%.
  • recess 72a and aperture 69a are provided at one of the ends of the plate and recess 72b and its aperture 69b are provided at the opposite end of the plate.
  • Aperture 69a faces aperture 690 of plate 23c; similarly. aperture 69b faces aperture 69a of plate 23a.
  • the driving fluid leaks from that portion of chamber 29 under high pressure into the space or chamber 730 defined by the curved ends of plates 23b and 23c and rotor 38. This fluid can escape through recess 72b and apertures 69'b and 69a. Chamber 730 is then at low pressure and the plates are applied firmly against the inner face of recess 29.
  • conduits 25 and 26 When the functions of conduits 25 and 26 are reversed and the rotor rotates in the opposite direction, the fluid from chamber 73a escapes through the recess 72a and apertures 69'a and 696.
  • the space or chamber 730 between plate 23b and plate 23c adjacent the part of recess 29 in communication with the inlet conduit 25, is in communication with the outlet, whereas chamber 73a between plate 23b and plate 23a is in communication with the inlet.
  • the end of each of the plates is located between a space under high pressure and a space under low pressure.
  • An apparatus for converting hydraulic or pneumatic energy into kinetic energy, or vice versa comprising a rotor and stator, in which the internal wall of the external element has at least two recesses capable of forming, in cooperation with the external wall of the internal element and the vanes carried by this internal element, chambers with a variable volume, in which the internal element comprises at least two vanes sliding into housings and cooperating with the wall of said recesses, an inlet line and an exhaust line for fluid being provided in the internal element respectively on either side of each vane, the number of vanes being different from that of the recesses, these recesses embracing an arc of a circle which extends over an angle which is smaller than that existing between the edge of the inlet or exhaust .line relative to a vane and the edge which is nearest to the exhaust or inlet line relative to the neighboring vane, and in which the housings of the internal element are connected to a source of fluid under pressure resulting in the application of the vanes against the internal wall of the external element, said apparatus being
  • vane housings are equally divided into at least two groups, in the same way as the inlet and/or outlet conduits of said vanes said groups being connected to the high-pressure source and to a source of lower pressure, for example, the low-pressure source, through a distributor valve whereby each of said housing groups can be put independently in communication with either fluid source, a vane being rendered inoperative by putting said inlet and outlet conduits in communication with the high-pressure source, at the same time that its housing is put in communication with the low-pressure source.
  • vane housings are equally divided into at least two groups, in the same way as the inlet and/or outlet conduits of said vanes, said groups being connected to the low-pressure source and to a source of higher pressure, for example, to the high-pressure source, through a distributor valve whereby each of said housing groups can be put independently in communication with either fluid source, a vane being rendered inoperative by putting its inlet and outlet conduits and its housings in communication with the low-pressure source.
  • the rotor is located outside the stator and comprises two sidewalls interconnected by crossmembers, an independent ring which has a small cross section and constant thickness and is interposed between the crossmembers and had a profile having a corrugated shape so as to define the recesses, and means carried by the crossmembers and adapted to exert a thrust on the outer face of the ring in regions of the ring between said recesses.
  • each vane comprises three vane plates and the center plate comprises, on each of its faces, a recess which is in communication with an aperture extending through the center plate, each assembly consisting of a recess and its aperture being in different planes and each of the end plates comprising an aperture facing the aperture in the center plate in communication with the recess in the face of said center plate in contact with the recess in the face of said center plate in contact with the third plate.
  • An apparatus for converting hydraulic or pneumatic energy into kinetic energy and vice versa comprising: an outer element and an inner element which are relatively rotatable about an axis, one of said elements constituting a rotor and the other of said elements constituting a stator, said inner element comprising a plurality of housings and an outer face, a plurality of vane means respectively slidably mounted in said housings, said outer element having an inner face which said vane means are capable of contacting and which defines a plurality of recesses capable of defining with said outer face of said inner element and said vane means variable volume chambers, said inner element comprising a first fluid conduit and a second fluid conduit respectively on one side and on an opposite other side of each vane means, one of said conduits constituting an outlet conduit, the number of vane means being different from the number of recesses, each recess occupying an arc of a circle which angularly extends relative to said axis an extent less than the angle subtented at said axis by an
  • An apparatus for converting hydraulic or pneumatic energy into kinetic energy and vice versa comprising: an outer element and an inner element which are relatively rotatable about an axis, one of said elements constituting a rotor and the other of said elements constituting a stator, said inner element comprising a plurality of housings and an outer face, a plurality of vane means respectively slidably mounted in said housings, said outer element having an inner face which said vane means are capable of contacting and which defines a plurality of recesses capable of defining with said outer face of said inner element and said vane means variablevolume chambers, said inner element comprising a first fluid conduit and a second fluid conduit respectively on one side an on an opposite other side of each vane means, one of said conduits constituting an inlet conduit and the other of said conduits constituting an outlet conduit, the number of vane means being different from the number of recesses, each recess occupying an arc of a circle which angularly extends relative to said axis an extent less
  • An apparatus as claimed in claim 11, comprising means dividing said housings into a plurality of independent housing groups, means including a distributor valve for putting said housing groups independently in communication selectively of lower pressure whereby a vane means can be rendered inoperative by putting the corresponding first and second conduits in communication with said high-pressure source at the same time as the housing of the vane means is put in communication with said source of lower pressure.
  • An apparatus as claimed in claim 11, comprising means dividing said housings into a plurality of independent housing groups, means including a distributor valve for putting said housing groups independently in communication selectively with said low-pressure source and a source of higher pressure than said low-pressure source, whereby a vane means can be rendered inoperative by putting the corresponding first and second conduits and its housing in communication with said low-pressure source.
  • said distributor valve comprises means for putting all said housings in communication with said low-pressure source whereby all said vane means can be rendered inoperative
  • said rotor is the outer element and comprises two sidewalls, crossmembers arranged around said axis and interconnecting said side walls, an independent ring having a small radial sectional size and a substantially constant thickness interposed between said walls within said crossmembers, said ring having a profile of corrugated shape defining a plurality of recesses, and thrust means carried by said crossmembers for exerting a thrust on an outer face of said ring in regions thereof between said recesses,
  • thrust means comprise rotatable eccentric members carried by said crossmernbers.
  • An apparatus for converting hydraulic or pneumatic energy into kinetic energy and vice versa comprising: an outer element and an inner element which are relatively rotatable about an axis, one of said elements constituting a rotor and the other of said elements constituting a stator, said inner element comprising a plurality of housings and an outer face, a plurality of vane means respectively slidably mounted in said housings, said outer element having an inner face which said vane means are capable of contacting and which defines a plurality of recesses capable of defining with said outer face of said inner element and said vane means variable volume chambers, said inner element comprising a first fluid conduit and a second fluid conduit respectively on one side and on an opposite other side of each vane means, one of said conduits constituting an outlet conduit, the number of vane means being different from the number of recesses, each recess occupying an arc of a circle which angularly extends relative to said axis an extent less than the angle subtented at said axis by an

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US889353A 1968-12-31 1969-12-30 Apparatus for converting hydraulic or pneumatic energy into kinetic energy or vice versa, such as a rotary multichamber vane-type motor or pumps Expired - Lifetime US3639092A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778199A (en) * 1972-03-24 1973-12-11 G Meacham Rotary engine
US3908768A (en) * 1973-03-17 1975-09-30 Bosch Gmbh Robert Rotary impact tool
US4373878A (en) * 1979-02-22 1983-02-15 Gaston Sauvaget Synchronized hydraulic rotary converter and distributor device
US20080083219A1 (en) * 2006-01-09 2008-04-10 Jerry Haagsman Fluid displacement based generator & method of using the same
US20120087820A1 (en) * 2010-09-15 2012-04-12 Patterson Albert W Rotary device
US20120289870A1 (en) * 2010-10-05 2012-11-15 The Board Of Trustees Of The University Of Illinois Portable active pneumatically powered ankle-foot orthosis
CN103953752A (zh) * 2014-04-03 2014-07-30 吴亚利 轴端马达油压分配阀组
GB2518276A (en) * 2013-07-10 2015-03-18 Spx Corp High torque rotary motor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1154602B (it) * 1981-12-14 1987-01-21 Barmag Barmer Maschf Pompa a celle, delimitate da palette

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24252A (en) * 1859-05-31 Boring-machine
US2716469A (en) * 1947-10-23 1955-08-30 Gassot Rene Jean Louis Fluid brakes for rotary members
US2992616A (en) * 1956-07-02 1961-07-18 Arthur E Rineer Fluid power converter
US3251308A (en) * 1965-03-12 1966-05-17 James E Dugan Rotary motor or pump
US3455247A (en) * 1967-09-12 1969-07-15 Dennis Daniels Retractable vane hydraulic motor-pump device
US3516769A (en) * 1967-02-10 1970-06-23 Martti Korhonen Rotary vane hydraulic motor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24252A (en) * 1859-05-31 Boring-machine
US2716469A (en) * 1947-10-23 1955-08-30 Gassot Rene Jean Louis Fluid brakes for rotary members
US2992616A (en) * 1956-07-02 1961-07-18 Arthur E Rineer Fluid power converter
US3251308A (en) * 1965-03-12 1966-05-17 James E Dugan Rotary motor or pump
US3516769A (en) * 1967-02-10 1970-06-23 Martti Korhonen Rotary vane hydraulic motor
US3455247A (en) * 1967-09-12 1969-07-15 Dennis Daniels Retractable vane hydraulic motor-pump device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778199A (en) * 1972-03-24 1973-12-11 G Meacham Rotary engine
US3908768A (en) * 1973-03-17 1975-09-30 Bosch Gmbh Robert Rotary impact tool
US4373878A (en) * 1979-02-22 1983-02-15 Gaston Sauvaget Synchronized hydraulic rotary converter and distributor device
US20080083219A1 (en) * 2006-01-09 2008-04-10 Jerry Haagsman Fluid displacement based generator & method of using the same
US20120087820A1 (en) * 2010-09-15 2012-04-12 Patterson Albert W Rotary device
US20120289870A1 (en) * 2010-10-05 2012-11-15 The Board Of Trustees Of The University Of Illinois Portable active pneumatically powered ankle-foot orthosis
US9480618B2 (en) * 2010-10-05 2016-11-01 Elizabeth T. Hsiao-Wecksler Portable active pneumatically powered ankle-foot orthosis
GB2518276A (en) * 2013-07-10 2015-03-18 Spx Corp High torque rotary motor
CN103953752A (zh) * 2014-04-03 2014-07-30 吴亚利 轴端马达油压分配阀组
CN103953752B (zh) * 2014-04-03 2016-03-02 吴亚利 轴端马达油压分配阀组

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