阅读说明：本技术 一种动静压轴承协同支撑水液压柱塞泵 (Hydrodynamic and hydrostatic bearing cooperative support water hydraulic plunger pump ) 是由 李东林 李阁强 李聚波 彭建军 李跃松 徐莉萍 董庆伟 于 2020-07-14 设计创作，主要内容包括：本发明涉及液压技术领域,具体涉及一种动静压轴承协同支撑水液压柱塞泵。动静压轴承协同支撑水液压柱塞泵,包括：壳体,具有泵入口和泵出口；缸体,通过缸体滑动轴承转动装配在所述壳体内,缸体上设有缸孔,以供柱塞滑动装配；主轴,通过主轴滑动轴承转动装配在所述壳体内,主轴与所述缸体固定装配在一起,以带动缸体转动；还包括：壳体流道,设置在所述壳体上,并与泵出口连通；第一轴承孔,设置在主轴滑动轴承上,连通壳体流道和主轴滑动轴承的内腔,供泵出口的水流向主轴的外周面以向主轴提供静压支撑；第二轴承孔,设置在缸体滑动轴承上,连通壳体流道和缸体滑动轴承的内腔,供泵出口的水流向缸体的外周面以向缸体提供静压支撑。(The invention relates to the technical field of hydraulic pressure, in particular to a hydrodynamic and hydrostatic bearing cooperative support water hydraulic plunger pump. Hybrid bearing supports water hydraulic pressure plunger pump in coordination includes: a housing having a pump inlet and a pump outlet; the cylinder body is rotatably assembled in the shell through a cylinder body sliding bearing, and a cylinder hole is formed in the cylinder body for sliding assembly of the plunger; the main shaft is rotatably assembled in the shell through a main shaft sliding bearing and fixedly assembled with the cylinder body so as to drive the cylinder body to rotate; further comprising: the shell runner is arranged on the shell and is communicated with the outlet of the pump; the first bearing hole is arranged on the main shaft sliding bearing and is communicated with the shell flow passage and the inner cavity of the main shaft sliding bearing, and water at the outlet of the pump flows to the outer peripheral surface of the main shaft to provide static pressure support for the main shaft; and the second bearing hole is arranged on the cylinder body sliding bearing and is communicated with the shell flow passage and the inner cavity of the cylinder body sliding bearing, and water at the outlet of the pump flows to the outer peripheral surface of the cylinder body so as to provide static pressure support for the cylinder body.)

1. Hybrid bearing supports water hydraulic pressure plunger pump in coordination includes:

a housing having a pump inlet and a pump outlet;

the cylinder body is rotatably assembled in the shell through a cylinder body sliding bearing, and a cylinder hole is formed in the cylinder body for sliding assembly of the plunger;

the main shaft is rotatably assembled in the shell through a main shaft sliding bearing and fixedly assembled with the cylinder body so as to drive the cylinder body to rotate;

it is characterized by also comprising:

the shell runner is arranged on the shell and is communicated with the outlet of the pump;

the first bearing hole is arranged on the main shaft sliding bearing and is communicated with the shell flow passage and the inner cavity of the main shaft sliding bearing, and water at the outlet of the pump flows to the outer peripheral surface of the main shaft to provide static pressure support for the main shaft;

and the second bearing hole is arranged on the cylinder body sliding bearing and is communicated with the shell flow passage and the inner cavity of the cylinder body sliding bearing, and water at the outlet of the pump flows to the outer peripheral surface of the cylinder body so as to provide static pressure support for the cylinder body.

2. The hydro-hydraulic plunger pump with cooperative hybrid bearing support of claim 1, wherein the housing flow channel is provided with a mounting hole, and a flow control valve is mounted in the mounting hole and used for adjusting the pressure of water in the housing flow channel.

3. The hydro-hydraulic ram pump with hybrid bearing support as in claim 2 wherein the housing flow path comprises a pressure input flow path, a first output flow path and a second output flow path, the pressure input flow path communicating the pump outlet and the mounting hole, the first output flow path communicating the mounting hole and the first bearing hole, the second output flow path communicating the mounting hole and the second bearing hole.

4. The hydro-hydraulic plunger pump with the hybrid bearing cooperatively supported according to claim 3, wherein the flow control valve comprises a valve housing having a valve cavity, the valve housing having a water inlet hole, a water outlet hole and a pressure regulating hole sequentially disposed thereon;

an upper throttling valve core and a lower throttling valve core are arranged in the valve cavity, a throttling valve port is formed between the upper throttling valve core and the valve sleeve, and an adjusting valve port is formed between the lower adjusting valve core and the valve sleeve;

the valve cavity is internally provided with an elastic piece which applies elastic acting force to the lower pressure regulating valve core so as to drive the lower pressure regulating valve core to move towards the direction of expanding the pressure regulating valve port;

the water inlet is communicated with the throttle valve port and the pressure input flow channel;

the water outlet is communicated with the regulating valve port and the corresponding output flow channel;

the pressure regulating hole is positioned below the lower pressure regulating valve core and is communicated with the outlet of the pump through a pressure compensating runner;

the water at the outlet of the pump enters the valve cavity through the pressure input flow channel and the water inlet hole, and flows to the corresponding output flow channel from the water outlet hole after being throttled by the throttle valve; the water at the outlet of the pump pushes the lower pressure regulating valve core through the pressure compensation flow channel and the pressure regulating hole so as to drive the lower pressure regulating valve core to move towards the direction of reducing the regulating valve port.

5. The hydro-hydraulic plunger pump with the hybrid bearing cooperatively supported according to claim 4, wherein the upper throttle valve core and the lower throttle valve core are sleeves with one closed end and the other open end, the openings of the two sleeves are oppositely arranged, the elastic member is a compression spring, and two ends of the compression spring are respectively positioned in the corresponding sleeves; a lower stop block is fixedly arranged in the valve cavity below the lower pressure regulating valve core and used for limiting the lower pressure regulating valve core; an upper stop block is arranged above the upper throttling valve core in the valve cavity and used for limiting the upper throttling valve core.

6. The hydro-hydraulic plunger pump with the hybrid bearing and the support as claimed in claim 5, wherein a threaded adjusting member is further disposed in the valve chamber, the threaded adjusting member is located above the upper stop block, and the threaded adjusting member pushes the upper stop block in a screwing process, so that a pre-compression amount of the compression spring is adjusted.

7. The hydro-hydraulic ram pump with hybrid bearing support as in claim 6 wherein the flow control valve is press-fitted into the mounting hole by a pressure plate, the threaded adjustment member being threaded onto the pressure plate.

8. The hydro-hydraulic plunger pump with the hybrid bearing cooperatively supported according to any one of claims 4 to 7, wherein the housing is further provided with a communication hole extending in the axial direction of the main shaft, and the pressure compensation flow passage and the pressure input flow passage are both communicated with the pump outlet through the communication hole.

9. The hydro-hydraulic plunger pump with cooperative support of hybrid bearing of any one of claims 1 to 7, wherein the inner side wall of the main shaft sliding bearing is provided with a first groove, and the first bearing hole is arranged at the bottom of the first groove; and a second groove is formed in the inner side wall of the cylinder body sliding bearing, and a second bearing hole is formed in the groove bottom of the second groove.

10. The hydro-hydraulic plunger pump with the hybrid bearing and the support as claimed in any one of claims 1 to 7, wherein the casing is provided with an exhaust plug on the outer side of the cylinder sliding bearing, and the exhaust plug is positioned on the flow passage of the casing.

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a hydrodynamic and hydrostatic bearing cooperative support water hydraulic plunger pump.

Background

The water hydraulic plunger pump is a core power element in a water hydraulic system, supplies a medium with certain pressure and flow for the water hydraulic system, and meets the use requirement of the water hydraulic system.

Chinese utility model patent with grant bulletin number CN201771701U discloses a water column stopper pump, which comprises a housin, be equipped with the main shaft in the casing, the rotary cylinder body, sloping cam plate and plunger piston shoe subassembly, the rotary cylinder body is rotated by main shaft drive, the plunger of plunger piston shoe subassembly slides the assembly in the jar hole of cylinder body, the piston shoe of plunger piston shoe subassembly is hugged closely all the time and slides on the sloping cam plate, when the appearance chamber that the plunger of plunger piston shoe subassembly and the jar hole of cylinder body formed enlarges, water gets into from the pump entry and holds the chamber, along with the rotation of main shaft, when the appearance chamber that the plunger of plunger piston shoe subassembly and the jar hole of cylinder body formed shrinks, the pressure of water risees, and discharge from the pump export, when the main shaft drives the cylinder body and rotates a week, every plunger piston shoe subassembly accomplishes once and absorbs water, the pressurized-water process, this.

Disclosure of Invention

The invention aims to provide a hydro-hydraulic plunger pump with a hybrid bearing and a support function, and aims to solve the technical problem that a water film formed when a main shaft rotates at a low speed is poor in stability in a water column plug pump in the prior art, wherein a sliding bearing is adopted to support a cylinder body and the main shaft.

In order to realize the purpose, the technical scheme of the invention for the hydrodynamic and hydrostatic bearing to cooperatively support the water hydraulic plunger pump is as follows:

hybrid bearing supports water hydraulic pressure plunger pump in coordination includes:

a housing having a pump inlet and a pump outlet;

the cylinder body is rotatably assembled in the shell through a cylinder body sliding bearing, and a cylinder hole is formed in the cylinder body for sliding assembly of the plunger;

the main shaft is rotatably assembled in the shell through a main shaft sliding bearing and fixedly assembled with the cylinder body so as to drive the cylinder body to rotate;

further comprising:

the shell runner is arranged on the shell and is communicated with the outlet of the pump;

the first bearing hole is arranged on the main shaft sliding bearing and is communicated with the shell flow passage and the inner cavity of the main shaft sliding bearing, and water at the outlet of the pump flows to the outer peripheral surface of the main shaft to provide static pressure support for the main shaft;

and the second bearing hole is arranged on the cylinder body sliding bearing and is communicated with the shell flow passage and the inner cavity of the cylinder body sliding bearing, and water at the outlet of the pump flows to the outer peripheral surface of the cylinder body so as to provide static pressure support for the cylinder body.

The beneficial effects are that: the cylinder body sliding bearing and the main shaft sliding bearing are introduced with static pressure support, the static pressure support plays a main role when the pump rotates at a low speed, and dynamic and static pressure support is cooperated during high-speed rotation, so that the support characteristics of the water hydraulic plunger pump during low-speed and high-speed rotation can be greatly improved, and the working performance of the water hydraulic plunger pump is improved. And the static pressure support introduced by the cylinder sliding bearing and the main shaft sliding bearing utilizes high-pressure water at the outlet of the pump, does not need an additional auxiliary power source, and is beneficial to the miniaturization of the pump.

Furthermore, a mounting hole is formed in the shell flow channel, a flow regulating valve is mounted in the mounting hole, and the flow regulating valve is used for regulating the pressure of water in the shell flow channel.

The beneficial effects are that: the pressure of the static pressure support of the cylinder sliding bearing and the main shaft sliding bearing is not influenced by the pressure of the outlet of the pump, and the stability of the static pressure support is improved.

Further, the casing runner includes pressure input runner, first output runner and second output runner, and pressure input runner intercommunication pump export and mounting hole, first output runner intercommunication mounting hole and first bearing hole, second output runner intercommunication mounting hole and second bearing hole.

The beneficial effects are that: the first output flow channel and the second output flow channel share the flow regulating valve in the mounting hole, so that the flow channel of the shell is simplified, and the cost is saved.

Furthermore, the flow regulating valve comprises a valve sleeve, the valve sleeve is provided with a valve cavity, and a water inlet hole, a water outlet hole and a pressure regulating hole are sequentially arranged on the valve sleeve;

an upper throttling valve core and a lower throttling valve core are arranged in the valve cavity, a throttling valve port is formed between the upper throttling valve core and the valve sleeve, and an adjusting valve port is formed between the lower adjusting valve core and the valve sleeve;

the valve cavity is internally provided with an elastic piece which applies elastic acting force to the lower pressure regulating valve core so as to drive the lower pressure regulating valve core to move towards the direction of expanding the pressure regulating valve port;

the water inlet is communicated with the throttle valve port and the pressure input flow channel;

the water outlet is communicated with the regulating valve port and the corresponding output flow channel;

the pressure regulating hole is positioned below the lower pressure regulating valve core and is communicated with the outlet of the pump through a pressure compensating runner;

the water at the outlet of the pump enters the valve cavity through the pressure input flow channel and the water inlet hole, and flows to the corresponding output flow channel from the water outlet hole after being throttled by the throttle valve; the water at the outlet of the pump pushes the lower pressure regulating valve core through the pressure compensation flow channel and the pressure regulating hole so as to drive the lower pressure regulating valve core to move towards the direction of reducing the regulating valve port.

Furthermore, the upper throttle valve core and the lower throttle valve core are sleeves with one closed end and the other open end, the openings of the two sleeves are arranged oppositely, the elastic part is a pressure spring, and two ends of the pressure spring are respectively positioned in the corresponding sleeves; a lower stop block is fixedly arranged in the valve cavity below the lower pressure regulating valve core and used for limiting the lower pressure regulating valve core; an upper stop block is arranged above the upper throttling valve core in the valve cavity and used for limiting the upper throttling valve core.

The beneficial effects are that: the elastic part is a pressure spring, and two ends of the pressure spring are respectively positioned in the corresponding sleeves, so that the pressure spring cannot deflect in the stretching process.

Furthermore, a thread adjusting piece is arranged in the valve cavity and located above the upper stop block, and the thread adjusting piece pushes the upper stop block in the screwing process so as to adjust the pre-compression amount of the pressure spring.

The beneficial effects are that: the size of the static pressure support is adjusted by adjusting the pre-compression amount of the pressure spring.

Furthermore, the flow regulating valve is pressed in the mounting hole through a pressing plate, and the thread regulating part is in threaded connection with the pressing plate.

The beneficial effects are that: the clamp plate not only can be convenient with flow control valve fixed mounting in the mounting hole, screw thread regulating part and screw thread regulating part threaded connection are convenient for its precompression volume of adjusting the pressure spring in addition.

Furthermore, the shell is also provided with a communication hole extending along the axial direction of the main shaft, and the pressure compensation flow channel and the pressure input flow channel are both communicated with the pump outlet through the communication hole.

The beneficial effects are that: the pressure compensation flow channel and the pressure input flow channel share the communication hole to be communicated with the pump outlet, so that the pressure compensation flow channel and the pressure input flow channel can be conveniently processed.

Furthermore, a first groove is formed in the inner side wall of the main shaft sliding bearing, and the first bearing hole is formed in the bottom of the first groove; and a second groove is formed in the inner side wall of the cylinder body sliding bearing, and a second bearing hole is formed in the groove bottom of the second groove.

The beneficial effects are that: the inner side wall of the corresponding sliding bearing is provided with the groove, so that the supporting area of static pressure is increased, and the stability of static pressure support is further ensured.

Furthermore, an exhaust plug is arranged on the outer side of the cylinder body sliding bearing on the shell, and the exhaust plug is positioned on a shell flow passage.

The beneficial effects are that: by the design, the exhaust plug can be provided with the plug flow channel, so that the plug flow channel is used as a part of the shell flow channel, and the processing of part of the shell flow channel is facilitated.

Drawings

FIG. 1 is a schematic structural view of an embodiment 1 of a hydro-hydraulic plunger pump cooperatively supported by a hybrid bearing according to the present invention;

FIG. 2 is a schematic structural view of the front support unit of FIG. 1;

FIG. 3 is a front view of the front support unit of FIG. 1;

FIG. 4 is a sectional view taken along line A-A of FIG. 3;

FIG. 5 is a full sectional view of FIG. 3;

FIG. 6 is a schematic structural view of the flow control valve of FIG. 1;

FIG. 7 is a schematic structural view of the rear support unit of FIG. 1;

FIG. 8 is a side view of FIG. 7;

in the figure: 1-front housing; 2-a rear housing; 3-a rear cover plate; 4-cylinder body; 5-a main shaft; 6-cylinder block sliding bearing; 7-a plunger; 8-a second output flow channel; 9-a first output flow channel; 10-a flow regulating valve; 101-a threaded adjustment; 102-a platen; 103-a valve housing; 104-water inlet hole; 105-water outlet; 106-pressure regulating holes; 107-lower stop; 108-pressure springs; 109-lower pressure regulating valve core; 110-regulating valve port; 111-an upper throttle valve spool; 112-an upper stop block; 113-throttle valve port; 11-a swash plate; 12-a return disc; 13-spring seats; 14-a central spring; 15-a guide seat; 16-a floating disc; 17-port plate; 18-a main shaft sliding bearing; 19-a slipper; 20-spherical hinge; 21-front cover plate; 22-mechanical sealing; 23-exhaust plug; 231-plug flow channel; 24-pump outlet; 25-large arc-shaped holes; 26-small arc-shaped holes; 27-main shaft water cavity; 28-first bearing bore; 29-pump inlet; 30-a mounting surface; 31-mounting holes; 311-water inlet ring cavity; 312-water outlet ring cavity; 32-a pressure input flow channel; 33-pressure compensation flow channel; 34-a communication hole; 35-cylinder water cavity; 36-second bearing hole; 37-common flow path.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the drawings and are only for convenience of description of the present invention, and do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

The invention relates to a concrete embodiment 1 of a hydrodynamic and hydrostatic bearing cooperative support water hydraulic plunger pump:

as shown in fig. 1, the hydraulic plunger pump in this embodiment is a single swash plate plunger pump, and includes a front supporting unit and a rear supporting unit, the front supporting unit is located in front of the hydraulic plunger pump, the front supporting unit includes a front housing 1, a front cover plate 21 is fixedly disposed in front of the front housing 1, a sealing ring is disposed between the front cover plate 21 and the front housing 1, and a mechanical seal 22 is disposed between the front cover plate 21 and a main shaft 5 to ensure sealing performance of the front of the hydraulic plunger pump; the rear support unit is located the rear portion of water hydraulic pressure plunger pump, and the rear support unit includes back casing 2, and bolt fixed connection back shroud 3 is passed through to the rear portion of back casing 2, is equipped with the sealing washer between back shroud 3 and the back casing 2 to guarantee the sealing performance at water hydraulic pressure plunger pump rear portion.

The mechanical seal 22 is fitted over the main shaft 5 from the front end of the main shaft 5, the rear end of the mechanical seal 22 is retained by a shoulder on the main shaft 5, and the front cover plate 21 abuts against the front end of the mechanical seal 22 and is fixed to the front housing 1 to retain the front end of the mechanical seal 22.

In the embodiment, the front shell 1, the front cover plate 21, the rear shell 2 and the rear cover plate 3 together enclose a cavity of the hydraulic plunger pump; the rotary unit is arranged in the cavity and comprises a cylinder body 4 and a main shaft 5, a cylinder body sliding bearing 6 is arranged between the peripheral surface of the cylinder body 4 and the wall of the cavity, and the cylinder body 4 is rotatably assembled in the cavity through the cylinder body sliding bearing 6.

The main shaft 5 and the cylinder body 4 are coaxially arranged, a main shaft sliding bearing 18 is arranged between the outer peripheral surface of the main shaft 5 and the cavity wall of the cavity, and the main shaft 5 is rotatably assembled in the cavity through the main shaft sliding bearing 18, wherein the water hydraulic plunger pump in the embodiment is a single swash plate plunger pump, so that the rear end of the main shaft 5 is assembled on the cylinder body 4 in a rotation stopping manner, and preferably, the rear end of the main shaft 5 is connected to the cylinder body 4 in a threaded manner so as to realize the fixed assembly of the main shaft 5 and the cylinder body 4; the front end of the main shaft 5 extends out of the cavity and is in transmission connection with a corresponding driving device, and when the driving device drives the main shaft 5 to rotate, the main shaft 5 drives the cylinder body 4 to rotate in the cavity.

In the present embodiment, the main shaft slide bearing 18 and the cylinder slide bearing 6 support the rotating unit together, the main shaft slide bearing 18 supports the outer peripheral surface of the main shaft 5, and the cylinder slide bearing 6 supports the outer peripheral surface of the cylinder.

The main shaft sliding bearing 18 and the cylinder body sliding bearing 6 are fixed in the cavity of the cylinder body 4 in an interference fit mode and are made of ceramic materials. In other embodiments, the main shaft sliding bearing and the cylinder sliding bearing may be fixed in the cavity of the cylinder by gluing. In other embodiments, the main shaft sliding bearing and the cylinder sliding bearing can be made of high-strength composite materials.

As shown in fig. 1, a swash plate 11 is fixedly arranged on the rear cover plate 3, a plurality of plunger piston shoe assemblies are arranged between the swash plate 11 and the cylinder block, the plunger piston shoe assemblies are arranged at intervals along the axial direction of the cylinder block 4, each plunger piston shoe assembly comprises a plunger 7 and a piston shoe 19, a cylinder hole is formed in the cylinder block 4, and the plunger 7 is slidably assembled in the cylinder hole.

In this embodiment, a return disc 12 is disposed on the front side of the swash plate 11, the sliding shoes 19 pass through the return disc 12 and then abut against the inclined surface of the swash plate 11, a spherical hinge 20 is disposed on the front side of the middle position of the return disc 12, the spherical surface of the spherical hinge 20 abuts against the spring seat 13, the boss of the spherical hinge 20 is fixed on the center hole of the return disc 12, a center spring 14 is disposed on the front side of the spring seat 13, and the rear end of the center spring 14 abuts against the spring seat 13 so as to press the sliding shoes 19 against the inclined surface of the swash plate 11 through the spring seat 13, the spherical hinge 20 and the return disc 12. The number of the center springs 14 is plural, and the front portion of each center spring 14 is located in the guide seat 15 so that the front end of each center spring 14 abuts on the cylinder 4.

Wherein, the front side of cylinder body 4 is equipped with floating disc 16, and floating disc 16 is fixed mounting on the cylinder hole of cylinder body 4. A port plate 17 is provided between the floating plate 16 and the front housing 1, and the port plate 17 is fixed to the rear side of the front housing 1.

As shown in fig. 2 and 3, the front housing 1 has a pump inlet 29 and a pump outlet 24, the pump inlet 29 communicating with the chamber of the cylinder 4 through a large arc-shaped hole 25, the pump outlet communicating with the chamber of the cylinder 4 through a small arc-shaped hole 26; the spindle sliding bearing 18 is installed at the central hole of the front shell 1, a first groove is formed in the inner wall of the spindle sliding bearing 18, a spindle water cavity 27 is formed by the first groove, a first bearing hole 28 is formed in the bottom of the spindle water cavity 27, water flowing out of the first bearing hole 28 enters the spindle water cavity 27, and the water in the spindle water cavity 27 is used for providing static pressure support for the spindle 5. In other embodiments, the spindle water chamber may not be provided if the bore diameter of the first bearing bore is sufficiently large.

As shown in fig. 3 to 5, the front housing 1 is provided with mounting holes 31, the mounting holes 31 extending inward in the radial direction of the front housing 1 from the outer circumferential surface of the front housing 1 to mount the flow rate adjustment valve 10; the mounting hole 31 is provided with a mounting surface 30 along the hole edge, and the axis of the mounting hole 31 is perpendicular to the mounting surface 30.

As shown in fig. 4, the front housing 1 is provided with a communication hole 34, the communication hole 34 extending in the axial direction of the front housing 1 and communicating with the small arc-shaped hole 26 to achieve communication with the pump outlet 24; the front case 1 is further provided with a pressure input flow passage 32 and a pressure compensation flow passage 33, the pressure input flow passage 32 and the pressure compensation flow passage 33 are arranged in parallel, both ends of the pressure input flow passage 32 are communicated with the mounting hole 31 and the communication hole 34, respectively, and both ends of the pressure compensation flow passage 33 are communicated with the mounting hole 31 and the communication hole 34, respectively. The end of the pressure input channel 32 communicating with the mounting hole 31 is located at the upper part of the mounting hole 31, and the end of the pressure compensation channel 33 communicating with the mounting hole 31 is located at the bottom of the mounting hole 31.

As shown in fig. 5, the front housing 1 is further provided with a first output flow passage 9, one end of the first output flow passage 9 is communicated with the first bearing hole 28 to further achieve communication with the spindle water chamber 27, and the other end of the first output flow passage 9 is communicated with the mounting hole 31 through a common flow passage 37.

As shown in fig. 7 and 8, a cylinder sliding bearing 6 is mounted on the inner side wall of the rear housing 2, a second groove is formed on the inner wall of the cylinder sliding bearing 6, the second groove forms a cylinder water cavity 35, a second bearing hole 36 is formed at the bottom of the cylinder water cavity 35, water flowing out of the second bearing hole 36 enters the cylinder water cavity 35, and the water in the cylinder water cavity 35 is used for providing static pressure support for the cylinder 4. In other embodiments, if the diameter of the second bearing hole is large enough, the cylinder water chamber may not be provided.

In this embodiment, the rear housing 2 is provided with a second output flow channel 8, one end of the second output flow channel 8 is communicated with the second bearing hole 36, so as to communicate with the cylinder water cavity 35, and the other end of the second output flow channel 8 is communicated with the mounting hole 31 through a common flow channel 37. Wherein, one end of the common flow passage 37 communicating with the mounting hole 31 is located at the middle of the mounting hole 31.

In this embodiment, the rear shell 2 is further provided with an exhaust plug 23, and the exhaust plug 23 is located at the radial outer side of the cylinder sliding bearing 6; the exhaust plug 23 is connected to the rear shell 2 in a threaded manner and is sealed by a sealing ring; the exhaust plug 23 is provided with a plug flow channel 231, and the plug flow channel 231 forms a part of the second output flow channel 8. The exhaust principle of the exhaust plug 23 is the same as that of the radiator.

As shown in fig. 1 and 6, a flow control valve 10 is installed in the installation hole 31 of the front housing 1, the flow control valve 10 includes a valve housing 103, the valve housing 103 has a valve cavity, and a water inlet hole 104, a water outlet hole 105 and a pressure regulating hole 106 are formed in the valve housing; an upper throttle valve core 111 and a lower throttle valve core 109 which can slide relatively are arranged in the valve cavity, a throttle valve port 113 is formed between the upper throttle valve core 111 and the valve sleeve 103, an adjusting valve port 110 is formed between the lower adjusting valve core and the valve sleeve 103, a pressure spring 108 is arranged between the two valve cores, and the pressure spring 108 applies elastic acting force which is far away from each other to the two valve cores so as to make the two valve cores far away from each other. In other embodiments, the flow regulating valve may be replaced by a pressure reducing valve of the prior art, in which case it is not necessary to provide a pressure regulating orifice and a pressure compensating flow passage.

The upper throttle valve core 111 and the lower throttle valve core 109 are sleeves with one closed end and the other open end, the openings of the two sleeves are arranged oppositely, and two ends of the pressure spring 108 are respectively located in the corresponding sleeves.

In this embodiment, the water inlet hole 104 communicates with the throttle valve port 113 and the pressure input flow channel 32, the water outlet hole 105 communicates with the regulating valve port 110 and the common flow channel 37, and the pressure regulating hole 106 is located at the lower portion of the lower pressure regulating valve core 109 and communicates with the pressure compensating flow channel 33. A plurality of water inlet holes 104 are arranged at intervals along the circumferential direction of the flow regulating valve 10, a water inlet ring cavity 311 is arranged in the mounting hole 31, and the water inlet holes 104 are communicated with the pressure input runner 32 through the water inlet ring cavity 311; a plurality of water outlet holes 105 are arranged at intervals along the circumferential direction of the flow regulating valve 10, a water outlet annular cavity 312 is arranged in the mounting hole 31, and the water outlet holes 105 are communicated with the common flow passage 37 through the water outlet annular cavity 312.

In this embodiment, a pressure plate 102 is disposed on the upper portion of the valve housing 103, the pressure plate 102 is press-fitted onto the valve housing 103 in a sealing manner, and the edge of the pressure plate 102 is fitted with the mounting surface 30 to fix the mounting surface 30 by a screw, thereby fixing the flow rate regulating valve in the mounting hole 31.

A lower stop block 107 and an upper stop block 112 are further arranged in the valve cavity, the upper throttle valve core 111, the pressure spring 108 and the lower pressure regulating valve core 109 are positioned between the lower stop block 107 and the upper stop block 112, the lower stop block 107 is used for limiting the lower pressure regulating valve core 109, and the upper stop block 112 is used for limiting the upper throttle valve core 111; the lower stop block 107 abuts against the bottom of the mounting hole 31, the upper stop block 112 is slidably and hermetically assembled in the valve cavity, the threaded adjusting piece 101 is arranged above the upper stop block 112, the threaded adjusting piece 101 is in threaded connection with the pressure plate 102, and the threaded adjusting piece 101 pushes against the upper stop block 112 in the screwing process to adjust the pre-compression amount of the pressure spring 108.

In this embodiment, the upper and lower both sides of inlet opening 104 all are equipped with ring packing, and the upper and lower both sides of apopore 105 all are equipped with ring packing to guarantee mutual sealed between inlet opening 104, apopore 105 and the pressure regulating hole 106, avoid interfering.

In the present embodiment, the first output flow passage 9, the second output flow passage 8, the pressure input flow passage 32, the pressure compensation flow passage 33, and the communication hole 34 together constitute a housing flow passage.

The working process of the water hydraulic plunger pump is as follows: the main shaft 5 drives the cylinder body 4 to rotate under the action of the driving device, the plunger piston shoe assembly is subjected to the combined action of elastic acting force and hydraulic pressure exerted by the central spring 14, the piston shoes 19 of the plunger piston shoe assembly always abut against the inclined surface of the swash plate 11 to run, and when a cavity formed by the plunger 7 of the plunger piston shoe assembly and a cylinder hole of the cylinder body 4 is enlarged, water enters the cavity from the pump inlet 29 through the flow distribution plate 17 and the floating plate 16; along with the rotation of the main shaft 5, when the cavity formed by the plunger 7 of the plunger piston shoe assembly and the cylinder hole of the cylinder body 4 is squeezed and reduced, the pressure of water is increased, and the water passes through the flow distribution disc 17 and the floating disc 16 to reach the pump outlet 24 and is discharged; and each plunger piston shoe assembly is sucked and discharged once every rotation period, and the working process of the water hydraulic plunger pump is obtained.

The dynamic and static pressure cooperative support principle is as follows: when the main shaft 5 rotates, high-pressure water at the pump outlet 24 is respectively introduced into the pressure input flow channel 32 and the pressure compensation flow channel 33 through the communication hole 34, the water at the pressure input flow channel 32 flows into the throttle valve port 113 through the water inlet hole 104, is throttled through the throttle valve port 113 formed by the upper throttle valve element 111 and the valve sleeve 103 of the flow regulating valve 10, enters the common flow channel 37 through the water outlet hole 105, and then respectively supplies pressure to the main shaft water cavity 27 of the main shaft sliding bearing 18 and the cylinder water cavity 35 of the cylinder sliding bearing 6 through the first output flow channel 9 and the second output flow channel 8, the main shaft 5 is supported by the static pressure support and the dynamic pressure support of the main shaft water cavity 27, the cylinder 4 is supported by the static pressure support and the dynamic pressure support of the cylinder sliding bearing 35, and the rotary unit of the pump is supported by the static pressure.

High-pressure water at the pump outlet 24 is introduced into the bottom of the lower pressure regulating valve core 109 through the pressure compensation flow passage 33 and the pressure regulating hole 106, when the pressure at the pump outlet 24 is increased, the hydraulic pressure overcomes the elastic acting force of the pressure spring 108, the regulating valve port 110 formed by the lower pressure regulating valve core 109 and the valve sleeve 103 is reduced, the throttling function is enhanced, and the flow of water flowing out through the water outlet hole 105 is ensured to be unchanged; when the pressure of the pump outlet 24 is reduced, the elastic acting force of the pressure spring 108 overcomes the hydraulic pressure, the regulating valve port 110 formed by the lower regulating valve core 109 and the valve sleeve 103 is increased, the throttling function is weakened, and the flow of water flowing out through the water outlet hole 105 is ensured to be unchanged. Therefore, the hydrostatic support of the main shaft sliding bearing 18 and the cylinder sliding bearing 6 is not affected by the pressure of the pump outlet 24, and the pressure and the flow rate of the main shaft water chamber 27 and the cylinder water chamber 35 can be ensured to be constant.

The rotating unit in this embodiment adopts a front-rear double-support structure, the cylinder sliding bearing 6 at the rear end has a large diameter and strong bearing capacity, and bears most of the load of the cylinder 4, and the main shaft sliding bearing 18 at the front end plays an auxiliary supporting role, so as to improve the rotating precision of the rotating unit. The cylinder body sliding bearing 6 and the main shaft sliding bearing 18 introduce static pressure support, the static pressure support plays a main role when the pump rotates at a low speed, and dynamic and static pressure support is cooperated during high-speed rotation, so that the support characteristics of the water hydraulic plunger pump during low-speed and high-speed rotation can be greatly improved, and the working performance of the water hydraulic plunger pump is improved. And the high-pressure water at the pump outlet 24 is introduced into the cylinder sliding bearing 6 and the main shaft sliding bearing 18, so that an additional auxiliary power source is not needed, and the miniaturization of the pump is facilitated. In addition, the flow regulating valve 10 is arranged on the static pressure support circuit, so that the pressure and the flow of the static pressure support of the cylinder sliding bearing 6 and the main shaft sliding bearing 18 are not influenced by the pressure of the pump outlet 24, and the stability of the static pressure support is improved.

The invention relates to a concrete embodiment 2 of a hydrodynamic and hydrostatic bearing cooperative support water hydraulic plunger pump, which comprises the following steps: