CN215762190U - Radial plunger pump - Google Patents

Abstract

The utility model discloses a radial plunger pump which comprises a pump body, a cam shaft and a plunger assembly, wherein the pump body is provided with a shaft hole, a plunger hole, a liquid inlet and a liquid outlet; the camshaft is rotatably arranged in the shaft hole; plunger subassembly includes cylinder liner and plunger, the cylinder liner sets up downthehole at the plunger, the plunger sets up in the cylinder liner, the plunger includes the plunger head, a plunger section of thick bamboo and working chamber, the plunger head links to each other with the cylinder liner is sealed, a plunger section of thick bamboo is mobile between feed liquor position and flowing back position, a plunger section of thick bamboo sets up with the cylinder liner interval apart on the extending direction in shaft hole, the plunger has relative shutoff end and opening end, shutoff end and camshaft cooperation, a plunger section of thick bamboo that is located the feed liquor position is released by the camshaft, so that inlet and working chamber intercommunication, a plunger section of thick bamboo that is located the flowing back position is compressed so that leakage fluid dram and working chamber intercommunication by the camshaft. The radial plunger pump provided by the embodiment of the utility model has the advantages of large application range, high reliability and the like.

Description

Radial plunger pump

Technical Field

The utility model relates to the technical field of plunger pumps, in particular to a radial plunger pump.

Background

The radial plunger pump in the related art comprises a pump body, a cam shaft, a cylinder sleeve and a plunger, wherein the cam shaft is rotatably arranged in the pump body, the cylinder sleeve is arranged in a plunger hole of the pump body, and a working cavity is defined between the cylinder sleeve and the plunger. The plunger is inserted into the cylinder sleeve from one end of the cylinder sleeve, the cam shaft is matched with the plunger, and the plunger makes reciprocating linear motion in the cylinder sleeve in the rotation process of the cam shaft so as to reduce and increase the working cavity alternately, thereby realizing liquid feeding and draining. The cylinder sleeve and the plunger are sealed by the sealing ring, so that the problems of small application range and low reliability exist.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the utility model provides a radial plunger pump to solve the problems of small application range and low reliability of the radial plunger pump in the related art.

A radial plunger pump according to an embodiment of the present invention includes:

the pump body is provided with a shaft hole, a plunger piston hole, a liquid inlet and a liquid outlet, and the extension direction of the shaft hole is vertical to the extension direction of the plunger piston hole;

the camshaft is rotatably arranged in the shaft hole; and

the plunger assembly comprises a cylinder sleeve and a plunger, the cylinder sleeve is arranged in the plunger hole, the plunger is arranged in the cylinder sleeve and comprises a plunger head, a plunger barrel and a working cavity, the plunger barrel is disposed closer to the camshaft than the plunger head in an extending direction of the plunger hole, the plunger head is connected with the cylinder sleeve in a sealing way, the plunger barrel can move between a liquid inlet position and a liquid discharge position, the plunger cylinder is arranged at a distance from the cylinder sleeve in the extension direction of the shaft hole, the plunger is provided with a plugging end and an opening end which are opposite, the plugging end is matched with the cam shaft, the plunger barrel positioned at the liquid inlet position is released by the cam shaft, so that the liquid inlet is communicated with the working cavity, and the plunger cylinder positioned at the liquid discharge position is compressed by the cam shaft so that the liquid discharge port is communicated with the working cavity.

The radial plunger pump provided by the embodiment of the utility model has the advantages of large application range, high reliability and the like.

In some embodiments, the plunger assembly further comprises a plunger seat comprising a plunger seat barrel, a first mating portion and a second mating portion, the plunger seat barrel being in guiding sliding fit with the cylinder sleeve along the extension direction of the plunger hole, the first mating portion being in mating engagement with the camshaft, and the second mating portion being in mating engagement with the blocking end.

In some embodiments, the cylinder liner includes an outer cylinder liner and an inner cylinder liner, the outer cylinder liner includes an outer sleeve body, the inner cylinder liner includes an inner sleeve body, the outer sleeve body is arranged at a distance from the inner sleeve body along the extension direction of the shaft hole, the plunger is arranged in the inner sleeve body, and the plunger seat cylinder is movably arranged between the outer sleeve body and the inner sleeve body along the extension direction of the plunger hole.

In some embodiments, the camshaft includes an eccentric shaft and a cam, the cam is sleeved on the eccentric shaft, the eccentric shaft is provided with an oil inlet channel, the outer circumferential surface of the eccentric shaft and/or the inner circumferential surface of the cam is provided with an oil storage tank, and the oil storage tank is communicated with the oil inlet channel.

In some embodiments, the cam is provided with a cam oil passage, the cam oil passage is communicated with the oil inlet passage, and an opening at one end of the cam oil passage is formed in the outer circumferential surface of the cam.

In some embodiments, the outer cylinder sleeve further includes an outer connector disposed closer to the camshaft than the outer sleeve in an extending direction of the plunger hole, and an outer seal ring is disposed between the outer connector and a hole wall of the plunger hole;

the inner cylinder sleeve further comprises an inner connecting joint, the inner connecting joint is arranged in the extending direction of the plunger hole and is closer to the camshaft relative to the inner sleeve body, an inner sealing ring is arranged between the inner connecting joint and the hole wall of the plunger hole, the inner connecting joint and the outer connecting joint are arranged along the extending direction of the plunger hole, and the inner connecting joint is connected with the outer connecting joint.

In some embodiments, the plunger seat further comprises a plunger seat head, each of at least a portion of the first mating portion and the second mating portion being disposed on the plunger seat head, the at least a portion of the first mating portion being in sealing communication with the plunger seat barrel, the second mating portion being disposed within the inner housing.

In some embodiments, a first partial oil passage is provided on the first fitting portion, a second partial oil passage is provided on the second fitting portion, the second partial oil passage penetrates through the second fitting portion along the extending direction of the shaft hole, and the second partial oil passage is communicated with the oil inlet passage through the first partial oil passage.

In some embodiments, the plunger assembly further comprises a pressing ring connected with the cylinder sleeve, and at least a part of the plunger head is arranged between the pressing ring and the cylinder sleeve in the extension direction of the plunger hole.

In some embodiments, the plunger hole is provided with a plurality of plunger holes which are uniformly distributed at intervals around the shaft hole, and the plunger assembly is arranged in each plunger hole.

Drawings

FIG. 1 is a front view of a radial piston pump according to one embodiment of the present invention.

Fig. 2 is a view from a-a of fig. 1.

Fig. 3 is an enlarged view at B in fig. 2.

Fig. 4 is a schematic structural view of the cylinder plug assembly of fig. 2.

Fig. 5 is a schematic structural view of the valve body assembly of fig. 2.

Fig. 6 is a schematic structural view of the housing of fig. 1.

Fig. 7 is a schematic view of the eccentric shaft of fig. 1.

Reference numerals:

a radial plunger pump 100;

a pump body 1; a housing 101; a first seal groove 1011; a second seal groove 1012; third seal groove 1013; a fourth seal groove 1014; a total loading port 1015; a main drain 1016; a first end 1017; a second end 1018; a first end cap 102; a first oil cover 1021; a first rotary oil seal 1022; a second end cap 103; a second oil seal cover 1031; a second rotary oil seal 1032; an oil injection fitting 104; a shaft hole 105; a plunger bore 106; a liquid inlet 107; a drain port 108; a liquid inlet tank 109; a drain tank 110;

a camshaft 2; an eccentric shaft 201; an oil inlet passage 2011; an eccentric shaft oil passage 2012; an oil reservoir 2013; a communication groove 2014; a cam 202; the cam oil passage 2021;

a plunger assembly 3; an outer cylinder liner 301; an outer casing 3011; an external connector 3012; a fifth seal slot 3013; an inner cylinder liner 302; an inner housing 3021; an inner connector 3022; a sixth seal groove 3023; a plunger 303; a plunger head 3031; a plunger barrel 3032; a working chamber 3033; a blocking end 3034; open end 3035; a plunger seat 304; a plunger housing barrel 3041; a plunger seat head 3042; a first mating portion 30421; the second mating portion 30422; the first portion oil passage 30423; the second partial oil passages 30424; a pressure ring 305; a return spring 306;

a valve body assembly 4; a valve body 401; a valve cavity 402; the communicating portion 4021; a communication hole 403; a liquid inlet channel 404; a liquid discharge passage 405; a liquid inlet valve assembly 406; liquid inlet valve seat 4061; liquid inlet valve core 4062; a liquid inlet valve spring 4063; liquid inlet valve guide sleeve 4064; a drain valve assembly 407; a drain valve seat 4071; a drain spool 4072; a drain valve spring 4073; drain valve guide 4074; a liquid discharge valve cover 408 and a cover plate 409; a fastening bolt 410; a sleeve 411;

a first bearing 5;

a second bearing 6.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

As shown in fig. 1 to 7, a radial plunger pump 100 according to an embodiment of the present invention includes a pump body 1, a camshaft 2, and a plunger assembly 3. As shown in fig. 1 and 6, the pump body 1 has a shaft hole 105, a plunger hole 106, a liquid inlet 107, and a liquid outlet 108, the shaft hole 105 extends in a direction perpendicular to the plunger hole 106, and the camshaft 2 is rotatably provided in the shaft hole 105.

The plunger assembly 3 includes a cylinder sleeve disposed within the plunger bore 106 and a plunger 303 disposed within the cylinder sleeve. The plunger 303 comprises a plunger head 3031, a plunger barrel 3032 and a working chamber 3033, wherein the plunger barrel 3032 is arranged in the extending direction of the plunger hole 106 and is closer to the camshaft 2 relative to the plunger head 3031, the plunger head 3031 is connected with the cylinder sleeve in a sealing mode, the plunger barrel 3032 is movable between a liquid inlet position and a liquid outlet position, and the plunger barrel 3032 is arranged at a distance from the cylinder sleeve in the extending direction of the shaft hole 105. Plunger 303 has opposite blocked end 3034 and open end 3035, blocked end 3034 engaging camshaft 2. The plunger cylinder 3032 in the intake position is released by the camshaft 2 so that the intake port 107 communicates with the working chamber 3033, and the plunger cylinder 3032 in the discharge position is compressed by the camshaft 2 so that the discharge port 108 communicates with the working chamber 3033.

The plunger cylinder 3032 in the liquid discharge position is released by the camshaft 2, so that the volume of the working chamber 3033 is increased, and the liquid inlet 107 is communicated with the working chamber 3033, so that the working medium enters the working chamber 3033 from the outside. The plunger cylinder 3032 in the liquid discharge position is compressed by the camshaft 2, so that the volume of the working chamber 3033 is reduced, the liquid discharge port 108 is communicated with the working chamber 3033, and the working medium in the working chamber 3033 is discharged through the liquid discharge port 108.

In the related technology, a seal ring is used for sealing between a cylinder sleeve and a plunger of the radial plunger pump, the seal ring can only be suitable for sealing low-speed high-pressure medium or high-speed low-pressure medium, and can only be suitable for sealing oil-based medium with higher viscosity, but cannot be suitable for sealing working medium with high speed, high pressure and lower viscosity, so that the application range of the radial plunger pump is smaller. In addition, after the plunger pump is used for a period of time, a sealing ring between the cylinder sleeve and the plunger is easily abraded due to friction, and a working medium is easily leaked from the space between the cylinder sleeve and the plunger, so that the radial plunger pump has the problem of low reliability.

In the radial plunger pump 100 according to the embodiment of the utility model, during the rotation of the camshaft 2, the camshaft 2 is matched with the blocking end 3034 of the plunger cylinder 3032, so that the plunger cylinder 3032 is alternately released and compressed by the camshaft 2, and the inlet and the outlet of the working medium are further realized. Because the plunger head 3031 of the plunger 303 is connected with the cylinder sleeve in a sealing manner, the plunger head 3031 and the cylinder sleeve cannot move relatively, the sealing performance between the plunger head 3031 and the cylinder sleeve is better, and the sealing at the position is not easy to damage. Compared with the radial plunger pump 100 in the related art, the radial plunger pump 100 of the embodiment of the utility model has better sealing performance between the plunger 303 and the cylinder sleeve, so that the embodiment of the utility model can be used for not only low-speed high-pressure media and high-speed low-pressure media, but also high-speed high-pressure media and working media with lower viscosity. In addition, the plunger 303 and the cylinder sleeve have good sealing performance, and working medium can be prevented from leaking between the cylinder sleeve and the plunger 303.

Therefore, the radial piston pump 100 according to the embodiment of the present invention can be applied to a plurality of different working mediums, and the operational reliability thereof is high.

Therefore, the radial plunger pump 100 according to the embodiment of the utility model has the advantages of wide application range, high reliability and the like.

In some embodiments, the plunger assembly 3 further comprises a return spring 306, the return spring 306 being disposed within the working chamber 3033.

Therefore, the plunger cylinder 3032 is reset by the reset spring 306, so that the plunger cylinder 3032 can be reset quickly, and the reliability of the radial plunger pump 100 is further improved.

In some embodiments, as shown in fig. 2, the pump body 1 includes a housing 101, a first end cap 102, a second end cap 103, a first oil seal cover 1021, and a second oil seal cover 1031, the shaft hole 105, the plunger hole 106, the liquid inlet port 107, and the liquid outlet port 108 are all provided on the housing 101, the housing 101 has a first end 1017 and a second end 1018 which are opposite in the extending direction of the shaft hole 105, the first end cap 102 is provided on the first end 1017, and the second end cap 103 is provided on the second end 1018.

As shown in fig. 3, a first sealing groove 1011 and a second sealing groove 1012 are formed in the first end 1017, a first sealing ring is disposed in the first sealing groove 1011, a second sealing ring is disposed in the second sealing groove 1012, and the first sealing ring and the second sealing ring are both clamped between the casing 101 and the first end cap 102, so as to achieve sealing between the casing 101 and the first end cap 102. A third seal groove 1013 and a fourth seal groove 1014 are arranged on the second end 1018, a third seal ring is arranged in the third seal groove 1013, a fourth seal ring is arranged in the fourth seal groove 1014, and the third seal ring and the fourth seal ring are clamped between the casing 101 and the second end cap 103 to realize sealing between the casing 101 and the second end cap 103, so that the working medium is prevented from entering the pump body 1 through the third seal groove and the fourth seal ring, and the reliability of the radial piston pump 100 is further improved.

The first end cap 102 is provided with a first through hole, the first oil seal cover 1021 is arranged at the first through hole, and a first rotary oil seal 1022 is arranged between a part of the camshaft 2 located in the first through hole and the wall of the first through hole. The second end cover 103 is provided with a second through hole, the second oil seal cover 1031 is arranged at the second through hole, and a second rotary oil seal 1032 is arranged between a part of the camshaft 2 located in the second through hole and the hole wall of the second through hole. The first oil seal cover 1021 is provided with a first through hole, the second oil seal cover 1031 is provided with a second through hole, and one end of the camshaft 2 penetrates through the second through hole.

Thus, the first end cover 102, the second end cover 103, the first oil cover 1021, and the second oil cover 1031 prevent the lubricating oil in the pump body 11 from leaking out of the pump body 1.

In order to make the technical solution of the present invention easier to understand, the technical solution of the present invention will be described below by taking as an example that the extending direction of the shaft hole 105 coincides with the left-right direction and the extending direction of the plunger hole 106 coincides with the inside-outside direction. Wherein the left-right direction is shown by arrow C in fig. 2, and the inward-outward direction is shown by arrow D in fig. 2. Inward refers to a direction adjacent to the center line of the shaft hole 105 in the extending direction of the plunger hole 106, and outward refers to a direction away from the center line of the shaft hole 105 in the extending direction of the plunger hole 106.

The first endcap 102 (left endcap) is disposed at a first end 1017 (left end) of the housing 101, and the second endcap 103 (right endcap) is disposed at a second end 1018 (right end) of the housing 101. A first seal groove 1011 and a second seal groove 1012 are provided on the left end surface of the housing 101, and a third seal groove 1013 and a fourth seal groove 1014 are provided on the right end surface of the housing 101.

The left end cover is provided with a first through hole (left through hole), a first oil seal cover 1021 (left oil seal cover) is arranged at the left through hole, and a first rotary oil seal 1022 (left rotary oil seal) is arranged between one part of the camshaft 2 positioned in the left through hole and the hole wall of the left through hole. A second through hole (right through hole) is formed in the right end cover, a second oil seal cover 1031 (right oil seal cover) is arranged at the right through hole, and a second rotary oil seal 1032 (right rotary oil seal) is arranged between a part of the camshaft 2, which is located in the right through hole, and the hole wall of the right through hole. The left oil seal cover is provided with a first perforation (left perforation), the right oil seal cover is provided with a second perforation (right perforation), and the right end of the camshaft 2 penetrates out of the second perforation.

The plunger barrel 3032 is disposed inside the plunger head 3031, and the blocked end 3034 is disposed inside the open end 3035. The plunger barrel 3032 is provided spaced apart from the cylinder liner in the left-right direction. The distance between the closed end 3034 and the open end 3035 of the plunger barrel 3032 in the liquid feeding position is L1, the distance between the closed end 3034 and the open end 3035 of the plunger barrel 3032 in the liquid discharging position is L2, and L1 is greater than L2.

In some embodiments, the housing 101 is provided with a liquid inlet tank 109 and a liquid outlet tank 110, the liquid inlet 107 is communicated with the liquid inlet tank 109, and the liquid outlet 108 is communicated with the liquid outlet tank 110. The liquid inlet tank 109 is used for connecting with an external working medium, and the liquid outlet tank 110 is used for connecting with an external component so as to pump the working medium into the external component.

In some embodiments, the plunger hole 106 is provided in plurality, the plunger holes 106 are uniformly spaced around the shaft hole 105, and the plunger assembly 3 is provided in each plunger hole 106.

The plunger holes 106 and the plunger assemblies 3 are provided in plural, and during the continuous rotation of the camshaft 2 of the radial plunger pump 100, the plural plunger assemblies 3 work simultaneously to pump the working medium continuously into the external component, so that the working efficiency of the radial plunger pump 100 is high.

Preferably, as shown in fig. 5, the housing 101 is provided with a total liquid inlet 107 and a total liquid outlet 108, each liquid inlet tank 109 is communicated with the total liquid inlet 107, each liquid outlet tank 110 is communicated with the total liquid outlet 108, the total liquid inlet 107 is used for being connected with an external working medium, and the total liquid outlet 108 is used for being connected with an external component so as to pump the working medium into the external component.

In some embodiments, the camshaft 2 comprises an eccentric shaft 201 and a cam 202, the cam 202 being fitted over the eccentric shaft 201.

The two ends of the cam 202 can be limited by a clamp spring to prevent the cam 202 from sliding along the axial direction of the eccentric shaft 201, and the cam 202 is in clearance fit with the eccentric shaft 201.

In some embodiments, the plunger hole 106 is provided in plurality, the plunger holes 106 are uniformly spaced around the shaft hole 105, and the plunger assembly 3 is provided in each plunger hole 106.

For example, the plunger holes 106 and the plunger assemblies 3 are all five, five plunger assemblies 3 are correspondingly arranged in the five plunger holes 106, and the cam 202 is a five-star wheel. The eccentric shaft 201 drives the five-star wheel to rotate, so that the five-star wheel pushes the plunger cylinder 3032 of the five plunger assemblies 3 to move between the liquid inlet position and the liquid discharge position.

In some embodiments, the radial piston pump 100 further comprises a first bearing 55 and a second bearing 66, a first portion of the eccentric shaft 201 being connected to an inner race of the first bearing 55, and an outer race of the first bearing 55 being connected to the first end cap 102. A second portion of eccentric shaft 201 is connected to the outer race of second bearing 66, which outer race of second bearing 66 is connected to second end cap 103.

Thereby, eccentric shaft 201 is rotatably fitted in shaft hole 105101 of pump body 11 by first bearing 55 and second bearing 66.

In some embodiments, plunger assembly 3 further comprises press ring 305, press ring 305 is connected to the cylinder casing, and at least a portion of plunger head 3031 is disposed between press ring 305 and the cylinder casing in the direction of extension of plunger bore 106.

For example, as shown in fig. 4, a part of the plunger head 3031 is disposed between the pressing ring 305 and the cylinder sleeve, and the plunger 303 can be limited along the extending direction of the plunger hole 106 by using the pressing spring and the cylinder sleeve, so that the plunger 303 is effectively prevented from being pulled out from the plunger hole 106.

Preferably, an end surface of the pressing ring 305 remote from the blocking end 3034 is flush with an end surface of the plunger head 3031 remote from the blocking end 3034.

In some embodiments, as shown in fig. 2 to 4, the plunger assembly 3 further includes a plunger seat 304, the plunger seat 304 includes a plunger seat barrel 3041, a first mating portion 30421 and a second mating portion 30422, the plunger seat barrel 3041 is in guiding sliding fit with the cylinder liner along the extension direction of the plunger bore 106, the first mating portion 30421 is in fit with the camshaft 2, and the second mating portion 30422 is in fit with the blocking end 3034.

The plunger 303 is separated from the camshaft 2 by the plunger holder 304 engaging the camshaft 2 and by the plunger holder 304 engaging the stopper end 3034 of the plunger barrel 3032. Therefore, when the camshaft 2 rotates relative to the plunger 303 to rotate in the working process of the radial plunger pump 100, the camshaft 2 is not in direct contact with the plunger 303, so that the situation that the plunger cylinder 3032 is in friction wear due to relative movement with the camshaft 2 in the rotating process of the camshaft 2 is avoided, and the reliability of the radial plunger pump 100 is improved.

In some embodiments, the cylinder liners include an outer cylinder liner 301 and an inner cylinder liner 302, the outer cylinder liner 301 includes an outer sleeve 3011, the inner cylinder liner 302 includes an inner sleeve 3021, the outer sleeve 3011 is disposed apart from the inner sleeve 3021 in the extending direction of the shaft hole 105, the plunger 303 is disposed in the inner sleeve 3021, and the plunger barrel 3041 is movably disposed between the outer sleeve 3011 and the inner sleeve 3021 in the extending direction of the plunger hole 106.

The outer sleeve 3011 and the inner sleeve 3021 may be used to better guide the movement of the plunger sleeve 3041, thereby facilitating the improvement of the operational stability of the radial plunger pump 100.

In some embodiments, the outer cylinder casing 301 further includes an outer joint 3012, the outer joint 3012 is disposed closer to the camshaft 2 than the outer casing body 3011 in the extending direction of the plunger bore 106, and an outer seal ring is disposed between the outer joint 3012 and the bore wall of the plunger bore 106.

The inner cylinder sleeve 302 further includes an inner joint 3022, the inner joint 3022 is disposed closer to the camshaft 2 than the inner sleeve body 3021 in the extending direction of the plunger bore 106, an inner seal ring is disposed between the inner joint 3022 and the bore wall of the plunger bore 106, the inner joint 3022 and the outer joint 3012 are disposed along the extending direction of the plunger bore 106, and the inner joint 3022 is connected to the outer joint 3012.

For example, as shown in fig. 2 to 4, a fifth seal groove 3013 is provided on the outer peripheral surface of the external connector 3012, an external sealing ring is disposed in the fifth seal groove 3013, and the external sealing ring is interposed between the groove bottom of the fifth seal groove 3013 and the hole wall of the plunger hole 106. A sixth seal groove 3023 is formed in the outer peripheral surface of the inner joint 3022, and an inner seal ring is disposed in the sixth seal groove 3023 and interposed between the bottom of the sixth seal groove 3023 and the wall of the plunger bore 106.

Therefore, the sealing performance between the cylinder sleeve and the plunger hole 106 can be improved by using the outer sealing ring and the inner sealing ring, so that the leakage of the working medium from the wall between the cylinder sleeve and the wall of the plunger hole 106 is reduced or even avoided, and the reliability of the radial plunger pump 100 is further improved.

In some embodiments, the plunger seat 304 further includes a plunger seat head 3042, each of at least a portion of the first mating portion 30421 and the second mating portion 30422 being disposed on the plunger seat head 3042, at least a portion of the first mating portion 30421 being in sealed connection with the plunger seat barrel 3041, the second mating portion 30422 being disposed within the inner sleeve body 3021.

Therefore, a stable cavity is defined by the plunger seat 304, the outer cylinder sleeve 301 and the inner cylinder sleeve 302, the plunger 303 is arranged in the stable cavity, and the cavity wall of the cavity plays a good role in protecting and limiting the plunger 303, so that the reliability of the radial plunger pump 100 is further improved.

Preferably, the end face of the plunger seat barrel 3041 distal from the open end 3035 is flush with the end face of the plunger seat head 3042 distal from the open end 3035,

thus, a portion of the first mating portion 30421 is disposed on the plunger seating head 3042 and another portion of the first mating portion 30421 is disposed on the plunger seating barrel 3041.

The radial plunger pump 100 further comprises a valve body assembly 4, the valve body assembly 4 is detachably connected with the pump body 1, the valve body assembly 4 is arranged between a liquid inlet 107 and a liquid outlet 108, the liquid inlet 107 is communicated with the working cavity 3033 through the valve body assembly 4, and the liquid outlet 108 is communicated with the working cavity 3033 through the valve body assembly 4.

The valve body assembly 4 is detachably connected with the pump body 1, so that the valve body assembly 4 is easy to detach and replace.

The number of the valve body assemblies 4 is equal to that of the plunger assemblies 3, the valve body assemblies 4 correspond to the plunger assemblies 3 one by one, and the valve body assemblies 4 are fixed on the pump body 1 through bolts.

A return spring 306 is mounted within the working chamber 3033, and the return spring 306 is press fit between the valve body 401 of the valve body assembly 4 and the blocked end 3034 of the plunger barrel 3032.

In some embodiments, valve body assembly 4 includes a valve body 401, an inlet valve assembly 406, and a drain valve assembly 407. The valve body is provided with a valve cavity 402, a communicating hole 403, a liquid inlet channel 404 and a liquid discharge channel 405, the liquid inlet valve assembly 406 and the liquid discharge valve assembly 407 are arranged in the valve cavity 402, the communicating hole and the communicating hole 403 are communicated with each of the valve cavity and the working cavity 3033, the liquid inlet channel 404 is communicated with the liquid inlet 107, and the liquid discharge channel 405 is communicated with the liquid discharge port 108. The valve chamber 402 has a communication 4021 between the intake valve assembly 406 and the exhaust valve assembly 407.

Thus, the plunger cylinder 3032 in the intake position is released by the camshaft 2, so that the volume of the working chamber 3033 is increased, and the pressure in the working chamber 3033 and the communication part 4021 is instantaneously reduced, so that the pressure in the working chamber 3033 and the communication part 4021 is lower than that in the intake passage 404, the intake valve assembly 406 is opened, the exhaust valve assembly 407 is closed, and the intake port 107 is communicated with the working chamber 3033. The plunger cylinder 3032 in the drainage position is compressed by the camshaft 2, so that the working chamber 3033 is easily reduced, and the pressure in the working chamber 3033 and the communication part 4021 is increased, so that the pressure in the working chamber 3033 and the communication part 4021 is higher than the pressure in the drainage channel 405, the liquid inlet valve assembly 406 is closed, the drainage valve assembly 407 is opened, and the drainage port 108 is communicated with the working chamber 3033.

As shown in fig. 5, the inlet valve assembly 406 includes an inlet valve seat 4061, an inlet valve spool 4062, an inlet valve spring 4063, and an inlet valve guide 4064. The inlet valve seat 4061 is mounted in the valve chamber 402, the inlet valve core 4062 is movably disposed in the valve chamber 402 between an open position and a closed position, the inlet valve guide housing 4064 guides the movement of the inlet valve core 4062, and the inlet valve spring 4063 is used to provide a return elastic force to the inlet valve core 4062.

The bleed valve assembly 407 includes a bleed valve seat 4071, a bleed valve spool 4072, a bleed valve spring 4073, and a bleed valve guide housing 4074. The drain valve seat 4071 is mounted in the valve cavity 402, the drain valve spool 4072 is movably disposed in the valve cavity 402 between an open position and a closed position, the drain valve guide housing 4074 guides movement of the drain valve spool 4072, and the drain valve spring 4073 is used to provide a return spring force to the drain valve spool 4072.

A sleeve 411 is provided between the inlet valve assembly 406 and the outlet valve assembly 407, the sleeve 411 defining a communication portion 4021. The valve body assembly 44 further includes a drain valve cover 408, a cover plate 409 and fastening bolts 410, the drain valve cover 408 being mounted on one side of the valve cavity 402, the cover plate 409 being secured to the valve body 401 by the fastening bolts 410 to clamp the drain valve cover 408 between the cover plate 409 and the valve body 401.

Of course, the structural style of the valve body assembly 4 is not limited to the structure shown in fig. 5, and only needs to realize the liquid inlet and discharge functions.

In some embodiments, an oil inlet passage 2011 is provided on the eccentric shaft 201, an oil storage groove 2013 is provided on the outer circumferential surface of the eccentric shaft 201 and/or the inner circumferential surface of the cam 202, and the oil storage groove 2013 is communicated with the oil inlet passage 2011.

For example, as shown in fig. 2 and 7, the oil inlet passage 2011 is provided on a center line of the eccentric shaft 201, the oil reservoir 2013 is provided on an outer peripheral surface of the eccentric shaft 201, the eccentric shaft 201 is provided with an eccentric shaft oil passage 2012 extending in the extending direction of the plunger hole 106, and the oil reservoir 2013 and the oil inlet passage 2011 communicate with each other through the eccentric shaft oil passage 20122012. Of course, an oil reservoir 2013 may be provided on the inner peripheral surface of the cam 202, and the oil reservoir 2013 and the oil inlet passage 2011 are communicated with each other through the eccentric shaft oil passage 2012.

Preferably, the radial plunger pump 100 further comprises an oil injection joint 104, the oil injection joint 104 is connected with the second oil sealing cover 1031, and the oil injection joint 104 is communicated with the oil inlet passage 2011 on the eccentric shaft 201.

Therefore, lubricating oil with certain pressure can be input into the oil injection joint 104 through a small oil pump such as a gear pump, and then enters the oil storage groove 2013 through the oil inlet channel 2011, so that lubrication between the eccentric shaft 201 and the cam 202 is realized, and the effects of friction reduction, resistance reduction and static pressure balance are achieved.

The inner peripheral surface of the cam 202 can be directly in clearance fit with the eccentric shaft 201, and certainly, self-lubricating engineering materials can be tightly fitted on the inner peripheral surface of the cam 202 and are in clearance fit with the eccentric shaft 201, so that the friction and the wear are further reduced, and the service life of a friction pair is prolonged.

Preferably, the oil reservoir 2013 is provided around the center line of the eccentric shaft 201, the oil reservoir 2013 is provided in plurality, the outer circumferential surface of the eccentric shaft 201 is provided with a communication groove 2014 extending in the extending direction of the shaft hole 105, and each of the plurality of oil reservoirs 2013 is communicated with the communication groove 2014.

Therefore, lubricating oil entering from the oil inlet channel 2011 can reach each oil storage groove 2013 through the oil inlet channel 2011 and the communication groove 2014, so that lubrication between the eccentric shaft 201 and the cam 202 is realized more effectively, and the functions of reducing friction and resistance are achieved.

In some embodiments, the cam 202 is provided with a cam oil passage 2021, the cam oil passage 2021 communicates with the oil inlet passage 2011, and an end opening of the cam oil passage 2021 is provided on an outer peripheral surface of the cam 202.

Therefore, a part of the lubricating oil entering from the oil inlet passage 2011 can reach the outer peripheral surface of the cam 202 through the cam oil passage 2021, and the lubricating oil on the outer peripheral surface of the cam 202 can lubricate the contact surface between the cam 202 and the plunger seat 304, so that the effects of friction reduction and resistance reduction are achieved.

In some embodiments, the first fitting portion 30421 is provided with a first portion oil passage 30423, the second fitting portion 30422 is provided with a second portion oil passage 30424, the second portion oil passage 30424 passes through the second fitting portion 30422 in the extending direction of the shaft hole 105, and the second portion oil passage 30424 communicates with the oil intake passage 2011 via the first portion oil passage 30423.

Thus, a part of the lubricating oil entering from the oil inlet passage 2011 can reach between the inner cylinder liner 302 and the plunger seat 304 through the cam oil passage 2021, the first part oil passage 30423, and the second part oil passage 30424, lubricate the contact surface between the inner cylinder liner 302 and the plunger seat 304 and the contact surface between the plunger seat 304 and the plunger 303, and play a role in reducing friction and resistance.

The eccentric shaft 201 of the radial piston pump 100 according to the embodiment of the present invention is connected to the motor through a coupling

When the eccentric shaft 201 is driven by an external force to rotate, for example, the eccentric shaft 201 is connected to a motor through a coupling, and the motor drives the eccentric shaft 201 to rotate. The rotation of the eccentric shaft 201 drives the cam 202 to swing, and the cam 202 is contacted with the plunger seat head 3042 and the plunger seat barrel 3041 of the plunger 303 sleeve assembly, i.e. the rotation of the eccentric shaft 201 is converted into the reciprocating motion of the plunger seat 304. The operation of the eccentric shaft 201, the cam 202 and the plunger holder 304 is the same as the principle of the crank-slider mechanism. The reciprocating motion of the plunger seat 304 causes the compression and extension of the plunger 303, and when the plunger 303 is compressed by the cam 202, the volume of the working chamber 3033 is reduced, namely, the liquid discharging process; when the plunger 303 is released (extended) by the cam 202, the volume of the working chamber 3033 increases, i.e., the pipetting process.

Lubricating oil with certain pressure can be provided for the radial pump through the external oil pump and is conveyed to the key friction pair, and the effects of friction reduction and resistance reduction are achieved.

According to the radial plunger pump 100 provided by the embodiment of the utility model, the plunger assembly 3 comprises the elastic plunger 303, the cylinder sleeve and the like, the plunger assembly 3 can better realize a sealing effect, and can isolate media on the inner side and the outer side of the plunger 303 to realize the effect of separating a working medium from lubricating oil water. The working medium can be various, such as water, seawater, oil base, industrial water, organic compounds and the like, and the application range is wider.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A radial piston pump, comprising:

the pump body is provided with a shaft hole, a plunger piston hole, a liquid inlet and a liquid outlet, and the extension direction of the shaft hole is vertical to the extension direction of the plunger piston hole;

the camshaft is rotatably arranged in the shaft hole; and

the plunger assembly comprises a cylinder sleeve and a plunger, the cylinder sleeve is arranged in the plunger hole, the plunger is arranged in the cylinder sleeve, the plunger comprises a plunger head, a plunger barrel and a working cavity, the plunger head is connected with the cylinder sleeve in a sealing mode, the plunger barrel is arranged at a distance from the cylinder sleeve in the extending direction of the shaft hole, the plunger barrel can move between a liquid inlet position and a liquid discharging position, the plunger is provided with a blocking end and an opening end which are opposite, the blocking end is matched with the cam shaft, the plunger barrel at the liquid inlet position is released by the cam shaft so that the liquid inlet is communicated with the working cavity, and the plunger barrel at the liquid discharging position is compressed by the cam shaft so that the liquid discharging port is communicated with the working cavity.

2. The radial plunger pump of claim 1, wherein the plunger assembly further comprises a plunger seat, the plunger seat comprising a plunger seat barrel slidably engaged with the cylinder liner along an extension direction of the plunger bore, a first engaging portion engaged with the camshaft, and a second engaging portion engaged with the blocked end.

3. The radial plunger pump of claim 2, wherein the cylinder sleeve comprises an outer cylinder sleeve and an inner cylinder sleeve, the outer cylinder sleeve comprises an outer sleeve, the inner cylinder sleeve comprises an inner sleeve, the outer sleeve is arranged at a distance from the inner sleeve along the extension direction of the shaft hole, the plunger is arranged in the inner sleeve, and the plunger seat cylinder is movably arranged between the outer sleeve and the inner sleeve along the extension direction of the plunger hole.

4. The radial plunger pump of claim 3, wherein the cam shaft comprises an eccentric shaft and a cam, the cam is sleeved on the eccentric shaft, the eccentric shaft is provided with an oil inlet channel, the outer circumferential surface of the eccentric shaft and/or the inner circumferential surface of the cam is provided with an oil storage tank, and the oil storage tank is communicated with the oil inlet channel.

5. The radial plunger pump according to claim 4, wherein the cam is provided with a cam oil passage, the cam oil passage is communicated with the oil inlet passage, and an opening at one end of the cam oil passage is provided on an outer circumferential surface of the cam.

6. The radial plunger pump of claim 4 or 5, wherein the outer cylinder sleeve further comprises an outer connector, the outer connector is arranged closer to the camshaft relative to the outer sleeve body in the extension direction of the plunger hole, and an outer sealing ring is arranged between the outer connector and the hole wall of the plunger hole;

the inner cylinder sleeve further comprises an inner connecting joint, the inner connecting joint is arranged in the extending direction of the plunger hole and is closer to the camshaft relative to the inner sleeve body, an inner sealing ring is arranged between the inner connecting joint and the hole wall of the plunger hole, the inner connecting joint and the outer connecting joint are arranged along the extending direction of the plunger hole, and the inner connecting joint is connected with the outer connecting joint.

7. The radial plunger pump of claim 6, wherein the plunger seat further comprises a plunger seat head, at least a portion of the first mating portion and the second mating portion each being disposed on the plunger seat head, the at least a portion of the first mating portion being in sealing communication with the plunger seat barrel, the second mating portion being disposed within the inner housing.

8. The radial plunger pump according to claim 7, wherein a first portion oil passage is provided on the first engagement portion, a second portion oil passage is provided on the second engagement portion, the second portion oil passage penetrates the second engagement portion in the extending direction of the shaft hole, and the second portion oil passage is communicated with the oil feed passage through the first portion oil passage.

9. The radial plunger pump of any one of claims 1-5, wherein the plunger assembly further comprises a compression ring coupled to the cylinder liner, at least a portion of the plunger head being disposed between the compression ring and the cylinder liner in a direction of extension of the plunger bore.

10. The radial plunger pump of any one of claims 1-5, wherein said plunger bore is provided in plurality, said plurality of plunger bores being spaced around said shaft bore, said plunger assembly being provided in each of said plunger bores.

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