Radial Piston Pumps

Abstract

The present invention discloses a radial piston pump, which comprises a pump body, a camshaft and a plunger assembly, wherein the pump body has an axial hole, a plunger hole, a liquid inlet and a liquid discharge port, the extension direction of the axial hole is perpendicular to the extension direction of the plunger hole; the camshaft is rotatably arranged in the axial hole; 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 chamber, the plunger head is sealed and connected to the cylinder sleeve, the plunger barrel is movable between a liquid inlet position and a liquid discharge position, the plunger barrel is arranged spaced apart from the cylinder sleeve in the extension direction of the axial hole, the plunger has a relative blocking end and an open end, the blocking end cooperates with the camshaft, the plunger barrel at the liquid inlet position is released by the camshaft so that the liquid inlet is connected to the working chamber, and the plunger barrel at the liquid discharge position is compressed by the camshaft so that the liquid discharge port is connected to the working chamber. The radial piston pump of the embodiment of the present invention has the advantages of wide application range and high reliability.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, and in particular to a radial plunger pump. Background Art

[0002] The radial piston pump in the related art includes a pump body, a camshaft, a cylinder sleeve and a plunger. The camshaft is rotatably arranged in the pump body, and the cylinder sleeve is arranged in the plunger hole of the pump body. A working chamber 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 camshaft cooperates with the plunger. During the rotation of the camshaft, the plunger performs reciprocating linear motion in the cylinder sleeve so that the working chamber is alternately reduced and increased, thereby achieving liquid inlet and discharge. A sealing ring is used to seal between the cylinder sleeve and the plunger, which has the problems of small application range and low reliability. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a radial piston pump to solve the problems of small application range and low reliability of the radial piston pump in the related art.

[0005] A radial piston pump according to an embodiment of the present invention comprises:

[0006] A pump body, the pump body having an axial hole, a plunger hole, a liquid inlet and a liquid outlet, wherein the extending direction of the axial hole is perpendicular to the extending direction of the plunger hole;

[0007] a camshaft rotatably disposed in the shaft hole; and

[0008] The plunger assembly comprises a cylinder sleeve and a plunger, wherein 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 chamber, the plunger barrel is arranged closer to the camshaft than the plunger head in the extension direction of the plunger hole, the plunger head is sealingly connected to the cylinder sleeve, the plunger barrel is movable between a liquid inlet position and a liquid discharge position, the plunger barrel is arranged spaced apart from the cylinder sleeve in the extension direction of the axial hole, the plunger has a relative blocking end and an open end, the blocking end cooperates with the camshaft, the plunger barrel located at the liquid inlet position is released by the camshaft so that the liquid inlet is communicated with the working chamber, and the plunger barrel located at the liquid discharge position is compressed by the camshaft so that the liquid discharge is communicated with the working chamber.

[0009] The radial piston pump according to the embodiment of the present invention has the advantages of wide application range and high reliability.

[0010] In some embodiments, the plunger assembly further includes a plunger seat, which includes a plunger seat cylinder, a first mating part and a second mating part. The plunger seat cylinder is slidably matched with the cylinder sleeve guide along the extension direction of the plunger hole, the first mating part is matched with the camshaft, and the second mating part is matched with the blocking end.

[0011] In some embodiments, the cylinder sleeve includes an outer cylinder sleeve and an inner cylinder sleeve, the outer cylinder sleeve includes an outer sleeve body, the inner cylinder sleeve includes an inner sleeve body, the outer sleeve body is arranged to be spaced apart from the inner sleeve body along the extension direction of the axial 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.

[0012] In some embodiments, the camshaft includes an eccentric shaft and a cam, the cam is sleeved on the eccentric shaft, an oil inlet channel is provided on the eccentric shaft, an oil storage tank is provided on the outer circumference of the eccentric shaft and / or the inner circumference of the cam, and the oil storage tank is connected to the oil inlet channel.

[0013] In some embodiments, a cam oil passage is provided on the cam, 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 the outer peripheral surface of the cam.

[0014] In some embodiments, the outer cylinder sleeve further includes an outer connector, which is disposed closer to the camshaft than the outer casing in the extension direction of the plunger hole, and an outer sealing ring is disposed between the outer connector and the hole wall of the plunger hole;

[0015] The inner cylinder sleeve further includes an inner connecting head, which is arranged closer to the camshaft relative to the inner sleeve body in the extension direction of the plunger hole, an inner sealing ring is provided between the inner connecting head and the hole wall of the plunger hole, and the inner connecting head and the outer connecting head are arranged along the extension direction of the plunger hole, and the inner connecting head is connected to the outer connecting head.

[0016] In some embodiments, the plunger seat further includes a plunger seat head, at least a portion of the first mating portion and each of the second mating portions are arranged on the plunger seat head, the at least a portion of the first mating portion is sealed to the plunger seat tube, and the second mating portion is arranged in the inner sleeve.

[0017] In some embodiments, a first partial oil passage is provided on the first mating part, and a second partial oil passage is provided on the second mating part. The second partial oil passage passes through the second mating part along the extension direction of the axial hole, and the second partial oil passage is connected to the oil inlet passage through the first partial oil passage.

[0018] In some embodiments, the plunger assembly further includes a pressure ring connected to the cylinder sleeve, and at least a portion of the plunger head is disposed between the pressure ring and the cylinder sleeve in an extension direction of the plunger hole.

[0019] In some embodiments, the plunger holes are provided in plurality, and the plurality of plunger holes are evenly spaced around the axial hole, and the plunger assembly is provided in each of the plunger holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a front view of a radial piston pump according to an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 AA view.

[0022] Figure 3 yes Figure 2 Enlarged view of point B in the middle.

[0023] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle plunger assembly.

[0024] Figure 5 yes Figure 2 Schematic diagram of the structure of the valve body assembly.

[0025] Figure 6 yes Figure 1 Schematic diagram of the structure of the middle shell.

[0026] Figure 7 yes Figure 1 Schematic diagram of the structure of the eccentric shaft.

[0027] Reference numerals:

[0028] Radial piston pump 100;

[0029] Pump body 1; housing 101; first sealing groove 1011; second sealing groove 1012; third sealing groove 1013; fourth sealing groove 1014; total liquid inlet 1015; total liquid discharge port 1016; first end 1017; second end 1018; first end cover 102; first oil seal cover 1021; first rotary oil seal 1022; second end cover 103; second oil seal cover 1031; second rotary oil seal 1032; oil filling joint 104; shaft hole 105; plunger hole 106; liquid inlet 107; liquid discharge port 108; liquid inlet groove 109; liquid discharge groove 110;

[0030] Camshaft 2; eccentric shaft 201; oil inlet passage 2011; eccentric shaft oil passage 2012; oil storage tank 2013; connecting groove 2014; cam 202; cam oil passage 2021;

[0031] Plunger assembly 3; outer cylinder sleeve 301; outer sleeve body 3011; outer connector 3012; fifth sealing groove 3013; inner cylinder sleeve 302; inner sleeve body 3021; ​​inner connector 3022; sixth sealing groove 3023; plunger 303; plunger head 3031; plunger barrel 3032; working chamber 3033; blocking end 3034; open end 3035; plunger seat 304; plunger seat barrel 3041; plunger seat head 3042; first matching part 30421; second matching part 30422; first part oil passage 30423; second part oil passage 30424; pressure ring 305; return spring 306;

[0032] Valve body assembly 4; valve body 401; valve cavity 402; communication part 4021; communication hole 403; liquid inlet channel 404; liquid discharge channel 405; liquid inlet valve assembly 406; liquid inlet valve seat 4061; liquid inlet valve core 4062; liquid inlet valve spring 4063; liquid inlet valve guide sleeve 4064; liquid discharge valve assembly 407; liquid discharge valve seat 4071; liquid discharge valve core 4072; liquid discharge valve spring 4073; liquid discharge valve guide sleeve 4074; liquid discharge valve cover 408, cover plate 409; fastening bolts 410; sleeve 411;

[0033] First bearing 5;

[0034] Second bearing 6. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] like Figures 1 to 7 As shown, the radial piston pump 100 according to the embodiment of the present invention comprises a pump body 1, a camshaft 2 and a piston assembly 3. Figure 1 and Figure 6 As shown, the pump body 1 has an axial hole 105 , a plunger hole 106 , a liquid inlet 107 and a liquid outlet 108 . The extending direction of the axial hole 105 is perpendicular to the extending direction of the plunger hole 106 . The camshaft 2 is rotatably disposed in the axial hole 105 .

[0037] The plunger assembly 3 includes a cylinder sleeve and a plunger 303. The cylinder sleeve is arranged in the plunger hole 106, and the plunger 303 is arranged in the cylinder sleeve. The plunger 303 includes a plunger head 3031, a plunger barrel 3032 and a working chamber 3033. The plunger barrel 3032 is arranged closer to the camshaft 2 than the plunger head 3031 in the extension direction of the plunger hole 106. The plunger head 3031 is sealed and connected to the cylinder sleeve. The plunger barrel 3032 is movable between a liquid inlet position and a liquid discharge position. The plunger barrel 3032 is arranged spaced apart from the cylinder sleeve in the extension direction of the shaft hole 105. The plunger 303 has a blocking end 3034 and an open end 3035 opposite to each other, and the blocking end 3034 cooperates with the camshaft 2. The plunger cylinder 3032 located at the liquid inlet position is released by the camshaft 2 so that the liquid inlet port 107 is connected to the working chamber 3033 , and the plunger cylinder 3032 located at the liquid discharge position is compressed by the camshaft 2 so that the liquid discharge port 108 is connected to the working chamber 3033 .

[0038] The plunger cylinder 3032 at the discharge position is released by the camshaft 2, so that the volume of the working chamber 3033 increases, and then the liquid inlet 107 is connected with the working chamber 3033, so that the working medium enters the working chamber 3033 from the outside. The plunger cylinder 3032 at the discharge position is compressed by the camshaft 2, so that the volume of the working chamber 3033 decreases, and then the discharge port 108 is connected with the working chamber 3033, so that the working medium in the working chamber 3033 is discharged through the discharge port 108.

[0039] In the related art, a sealing ring is used to seal between the cylinder liner and the plunger of the radial piston pump. The sealing ring can only be used to seal low-speed high-pressure media or high-speed low-pressure media, and can only be used to seal oil-based media with high viscosity, but not high-speed high-pressure and low-viscosity working media, resulting in a small application range of the radial piston pump. In addition, after the plunger pump has been used for a period of time, the sealing ring between the cylinder liner and the plunger is prone to wear due to friction, and the working medium is prone to leak from between the cylinder liner and the plunger, resulting in the problem of low reliability of the radial piston pump.

[0040] According to the radial piston pump 100 of the embodiment of the present invention, during the rotation of the camshaft 2, the camshaft 2 is used to cooperate with the blocking end 3034 of the plunger barrel 3032, so that the plunger barrel 3032 is alternately released and compressed by the camshaft 2, thereby realizing the entry and discharge of the working medium. Since the plunger head 3031 of the plunger 303 is sealed and connected to the cylinder sleeve, the plunger head 3031 and the cylinder sleeve will not move relative to each other, and the sealing between the plunger head 3031 and the cylinder sleeve is good, and the sealing at this place is not easy to be damaged. Compared with the radial piston pump 100 in the related art, the radial piston pump 100 of the embodiment of the present invention has better sealing between the plunger 303 and the cylinder sleeve, so that the embodiment of the present invention can be used not only for low-speed high-pressure medium and high-speed low-pressure medium, but also for high-speed high-pressure medium and working medium with low viscosity. In addition, the good sealing between the plunger 303 and the cylinder sleeve can prevent the working medium from leaking between the cylinder sleeve and the plunger 303.

[0041] Therefore, the radial piston pump 100 according to the embodiment of the present invention can be applicable to a variety of different working media, and its working reliability is relatively high.

[0042] Therefore, the radial piston pump 100 according to the embodiment of the present invention has the advantages of a wide range of applications and high reliability.

[0043] In some embodiments, the plunger assembly 3 further includes a return spring 306 , which is disposed in the working chamber 3033 .

[0044] Therefore, by increasing the restoring elastic force of the plunger cylinder 3032 using the restoring spring 306 , the plunger cylinder 3032 can be quickly reset, which is beneficial to further improve the reliability of the radial piston pump 100 .

[0045] In some embodiments, Figure 2 As shown, the pump body 1 includes a shell 101, a first end cover 102, a second end cover 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 107 and the liquid discharge port 108 are all arranged on the shell 101, and the shell 101 has a first end 1017 and a second end 1018 opposite to each other in the extension direction of the shaft hole 105, the first end cover 102 is arranged on the first end 1017, and the second end cover 103 is arranged on the second end 1018.

[0046] like Figure 3As shown, a first sealing groove 1011 and a second sealing groove 1012 are provided on the first end 1017, a first sealing ring is provided in the first sealing groove 1011, a second sealing ring is provided in the second sealing groove 1012, and the first sealing ring and the second sealing ring are both sandwiched between the housing 101 and the first end cover 102 to achieve sealing between the housing 101 and the first end cover 102. A third sealing groove 1013 and a fourth sealing groove 1014 are provided on the second end 1018, a third sealing ring is provided in the third sealing groove 1013, a fourth sealing ring is provided in the fourth sealing groove 1014, and the third sealing ring and the fourth sealing ring are both sandwiched between the housing 101 and the second end cover 103 to achieve sealing between the housing 101 and the second end cover 103, thereby preventing the working medium from entering the pump body 1 through this place, which is conducive to further improving the reliability of the radial piston pump 100.

[0047] The first end cover 102 is provided with a first through hole, a first oil seal cover 1021 is arranged at the first through hole, and a first rotary oil seal 1022 is arranged between a portion of the camshaft 2 located in the first through hole and the hole wall of the first through hole. The second end cover 103 is provided with a second through hole, a second oil seal cover 1031 is arranged at the second through hole, and a second rotary oil seal 1032 is arranged between a portion 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, and the second oil seal cover 1031 is provided with a second through hole, and one end of the camshaft 2 passes through the second through hole.

[0048] Thus, the first end cover 102 , the second end cover 103 , the first oil seal cap 1021 , and the second oil seal cap 1031 prevent the lubricating oil in the pump body 11 from leaking out of the pump body 1 .

[0049] In order to make the technical solution of the present application easier to understand, the following describes the technical solution of the present application by taking the extension direction of the shaft hole 105 as being consistent with the left-right direction and the extension direction of the plunger hole 106 as being consistent with the inside-outside direction. Figure 2 As shown by the arrow C in the figure, the inner and outer directions are as follows Figure 2 As shown by the arrow D in FIG. Inward refers to the direction adjacent to the center line of the shaft hole 105 in the extending direction of the plunger hole 106, and outward refers to the direction away from the center line of the shaft hole 105 in the extending direction of the plunger hole 106.

[0050] The first end cover 102 (left end cover) is arranged at the first end 1017 (left end) of the housing 101, and the second end cover 103 (right end cover) is arranged at the second end 1018 (right end) of the housing 101. The first sealing groove 1011 and the second sealing groove 1012 are both arranged on the left end surface of the housing 101, and the third sealing groove 1013 and the fourth sealing groove 1014 are both arranged on the right end surface of the housing 101.

[0051] The left end cover is provided with a first through hole (left through hole), the first oil seal cover 1021 (left oil seal cover) is arranged at the left through hole, and a first rotating oil seal 1022 (left rotating oil seal) is arranged between a part of the camshaft 2 located in the left through hole and the hole wall of the left through hole. The right end cover is provided with a second through hole (right through hole), the second oil seal cover 1031 (right oil seal cover) is arranged at the right through hole, and a second rotating oil seal 1032 (right rotating oil seal) is arranged between a part of the camshaft 2 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 through hole (left through hole), the right oil seal cover is provided with a second through hole (right through hole), and the right end of the camshaft 2 passes through the second through hole.

[0052] The plunger barrel 3032 is arranged on the inner side of the plunger head 3031, and the plugging end 3034 is arranged on the inner side of the open end 3035. The plunger barrel 3032 is arranged to be spaced apart from the cylinder sleeve in the left and right directions. The distance between the plugging end 3034 and the open end 3035 of the plunger barrel 3032 located at the liquid inlet position is L1, and the distance between the plugging end 3034 and the open end 3035 of the plunger barrel 3032 located at the liquid discharge position is L2, and L1 is greater than L2.

[0053] In some embodiments, a liquid inlet groove 109 and a liquid discharge groove 110 are provided on the housing 101, the liquid inlet port 107 is connected to the liquid inlet groove 109, and the liquid discharge port 108 is connected to the liquid discharge groove 110. The liquid inlet groove 109 is used to connect to an external working medium, and the liquid discharge groove 110 is used to connect to an external component to pump the working medium into the external component.

[0054] In some embodiments, a plurality of plunger holes 106 are provided, and the plurality of plunger holes 106 are evenly spaced around the shaft hole 105 , and a plunger assembly 3 is provided in each plunger hole 106 .

[0055] There are multiple plunger holes 106 and plunger assemblies 3. During the continuous rotation of the camshaft 2 of the radial piston pump 100, multiple plunger assemblies 3 work simultaneously to continuously pump the working medium into the external component, so that the radial piston pump 100 has a higher working efficiency.

[0056] Preferably, if Figure 5 As shown, a total liquid inlet 107 and a total liquid discharge port 108 are provided on the shell 101, each liquid inlet groove 109 is connected to the total liquid inlet 107, each liquid discharge groove 110 is connected to the total liquid discharge port 108, the total liquid inlet 107 is used to connect to the external working medium, and the total liquid discharge port 108 is used to connect to the external component to pump the working medium into the external component.

[0057] In some embodiments, the camshaft 2 includes an eccentric shaft 201 and a cam 202 , and the cam 202 is sleeved on the eccentric shaft 201 .

[0058] Both ends of the cam 202 can be limited by a retaining spring to prevent the cam 202 from sliding along the axial direction of the eccentric shaft 201 , and there is a clearance fit between the cam 202 and the eccentric shaft 201 .

[0059] In some embodiments, a plurality of plunger holes 106 are provided, and the plurality of plunger holes 106 are evenly spaced around the shaft hole 105 , and a plunger assembly 3 is provided in each plunger hole 106 .

[0060] For example, there are five plunger holes 106 and five plunger assemblies 3, and the five plunger assemblies 3 are arranged in the five plunger holes 106 in a one-to-one correspondence. 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 cylinders 3032 of the five plunger assemblies 3 to move between the liquid inlet position and the liquid discharge position.

[0061] In some embodiments, the radial piston pump 100 further includes a first bearing 55 and a second bearing 66, the first portion of the eccentric shaft 201 is connected to the inner ring of the first bearing 55, and the outer ring of the first bearing 55 is connected to the first end cover 102. The second portion of the eccentric shaft 201 is connected to the outer ring of the second bearing 66, and the outer ring of the second bearing 66 is connected to the second end cover 103.

[0062] Thus, the eccentric shaft 201 is rotatably assembled in the shaft hole 105101 of the pump body 11 by using the first bearing 55 and the second bearing 66 .

[0063] In some embodiments, the plunger assembly 3 further includes a pressure ring 305 , which is connected to the cylinder sleeve, and at least a portion of the plunger head 3031 is disposed between the pressure ring 305 and the cylinder sleeve in the extension direction of the plunger hole 106 .

[0064] For example, Figure 4 As shown, a portion of the plunger head 3031 is disposed between the pressure ring 305 and the cylinder sleeve, and the plunger 303 can be limited along the extension direction of the plunger hole 106 by means of the compression spring and the cylinder sleeve, thereby effectively preventing the plunger 303 from falling out of the plunger hole 106 .

[0065] Preferably, the end surface of the pressure ring 305 away from the blocking end 3034 is flush with the end surface of the plunger head 3031 away from the blocking end 3034 .

[0066] In some embodiments, Figures 2 to 4 As shown, the plunger assembly 3 further includes a plunger seat 304, and the plunger seat 304 includes a plunger seat cylinder 3041, a first matching portion 30421 and a second matching portion 30422. The plunger seat cylinder 3041 is slidably matched with the cylinder sleeve guide along the extension direction of the plunger hole 106, the first matching portion 30421 is matched with the camshaft 2, and the second matching portion 30422 is matched with the blocking end 3034.

[0067] The plunger seat 304 cooperates with the camshaft 2, and the plunger seat 304 cooperates with the blocking end 3034 of the plunger barrel 3032, so that the plunger seat 304 is used to separate the plunger 303 from the camshaft 2. Therefore, during the operation of the radial piston pump 100, when the camshaft 2 rotates relative to the plunger 303, there is no direct contact between the camshaft 2 and the plunger 303, thereby avoiding friction and wear between the plunger barrel 3032 and the camshaft 2 due to relative movement during the rotation of the camshaft 2, which is beneficial to improving the reliability of the radial piston pump 100.

[0068] In some embodiments, the cylinder sleeve includes an outer cylinder sleeve 301 and an inner cylinder sleeve 302, the outer cylinder sleeve 301 includes an outer sleeve body 3011, the inner cylinder sleeve 302 includes an inner sleeve body 3021, the outer sleeve body 3011 is arranged to be spaced apart from the inner sleeve body 3021 along the extension direction of the axial hole 105, the plunger 303 is arranged in the inner sleeve body 3021, and the plunger seat cylinder 3041 is movably arranged between the outer sleeve body 3011 and the inner sleeve body 3021 along the extension direction of the plunger hole 106.

[0069] The outer sleeve 3011 and the inner sleeve 3021 can play a better guiding role in the movement of the plunger seat tube 3041, thereby facilitating the improvement of the working stability of the radial piston pump 100.

[0070] In some embodiments, the outer cylinder sleeve 301 further includes an outer connector 3012 , which is disposed closer to the camshaft 2 relative to the outer casing 3011 in the extension direction of the plunger hole 106 , and an outer sealing ring is disposed between the outer connector 3012 and the hole wall of the plunger hole 106 .

[0071] The inner cylinder sleeve 302 further includes an inner connecting head 3022, which is arranged closer to the camshaft 2 relative to the inner sleeve body 3021 in the extension direction of the plunger hole 106, and an inner sealing ring is provided between the inner connecting head 3022 and the hole wall of the plunger hole 106. The inner connecting head 3022 and the outer connecting head 3012 are arranged along the extension direction of the plunger hole 106, and the inner connecting head 3022 is connected to the outer connecting head 3012.

[0072] For example, Figures 2 to 4 As shown, a fifth sealing groove 3013 is provided on the outer circumference of the outer connector 3012, an outer sealing ring is arranged in the fifth sealing groove 3013, and the outer sealing ring is sandwiched between the groove bottom of the fifth sealing groove 3013 and the hole wall of the plunger hole 106. A sixth sealing groove 3023 is provided on the outer circumference of the inner connector 3022, an inner sealing ring is arranged in the sixth sealing groove 3023, and the inner sealing ring is sandwiched between the groove bottom of the sixth sealing groove 3023 and the hole wall of the plunger hole 106.

[0073] Therefore, the use of the outer sealing ring and the inner sealing ring can improve the sealing between the cylinder liner and the plunger hole 106, thereby reducing or even avoiding the leakage of the working medium from between the cylinder liner and the hole wall of the plunger hole 106, which is beneficial to further improve the reliability of the radial piston pump 100.

[0074] In some embodiments, the plunger seat 304 further includes a plunger seat head 3042, at least a portion of the first mating portion 30421 and each of the second mating portion 30422 are arranged on the plunger seat head 3042, at least a portion of the first mating portion 30421 is sealed and connected to the plunger seat tube 3041, and the second mating portion 30422 is arranged in the inner sleeve 3021.

[0075] Thus, a stable chamber is defined by the plunger seat 304, the outer cylinder sleeve 301 and the inner cylinder sleeve 302, and the plunger 303 is arranged in the stable chamber. The cavity wall of the chamber provides better protection and limiting effect on the plunger 303, which is beneficial to further improve the reliability of the radial piston pump 100.

[0076] Preferably, the end surface of the plunger seat tube 3041 away from the open end 3035 is flush with the end surface of the plunger seat head 3042 away from the open end 3035.

[0077] Thus, a portion of the first matching portion 30421 is disposed on the plunger seat head 3042 , and another portion of the first matching portion 30421 is disposed on the plunger seat tube 3041 .

[0078] The radial piston pump 100 further includes a valve body assembly 4, which is detachably connected to the pump body 1 and is arranged between the liquid inlet 107 and the liquid outlet 108. The liquid inlet 107 is connected to the working chamber 3033 through the valve body assembly 4, and the liquid outlet 108 is connected to the working chamber 3033 through the valve body assembly 4.

[0079] The valve body assembly 4 is detachably connected to the pump body 1 , so that the valve body assembly 4 is easy to disassemble and replace.

[0080] The number of valve body assemblies 4 is equal to the number of plunger assemblies 3 , and the valve body assemblies 4 correspond to the plunger assemblies 3 one by one. The valve body assemblies 4 are fixed to the pump body 1 by bolts.

[0081] The return spring 306 is installed in the working chamber 3033 , and the return spring 306 is press-fitted between the valve body 401 of the valve body assembly 4 and the blocking end 3034 of the plunger cylinder 3032 .

[0082] In some embodiments, the valve body assembly 4 includes a valve body 401, a liquid inlet valve assembly 406 and a liquid discharge valve assembly 407. The valve body is provided with a valve cavity 402, a connecting 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 connecting hole 403 is connected with each of the valve cavity and the working cavity 3033, the liquid inlet channel 404 is connected with the liquid inlet port 107, and the liquid discharge channel 405 is connected with the liquid discharge port 108. The valve cavity 402 has a connecting portion 4021 located between the liquid inlet valve assembly 406 and the liquid discharge valve assembly 407.

[0083] Thus, the plunger cylinder 3032 located at the liquid inlet position is released by the camshaft 2, so that the volume of the working chamber 3033 increases, and then the pressure in the working chamber 3033 and the communicating portion 4021 decreases instantly, so that the pressure in the working chamber 3033 and the communicating portion 4021 is less than the pressure in the liquid inlet channel 404, the liquid inlet valve assembly 406 is opened, and the liquid discharge valve assembly 407 is closed, so that the liquid inlet port 107 is connected with the working chamber 3033. The plunger cylinder 3032 located at the liquid discharge position is compressed by the camshaft 2, so that the volume of the working chamber 3033 is reduced, and then the pressure in the working chamber 3033 and the communicating portion 4021 increases, so that the pressure in the working chamber 3033 and the communicating portion 4021 is greater than the pressure in the liquid discharge channel 405, the liquid inlet valve assembly 406 is closed, and the liquid discharge valve assembly 407 is opened, so that the liquid discharge port 108 is connected with the working chamber 3033.

[0084] like Figure 5 As shown, the liquid inlet valve assembly 406 includes a liquid inlet valve seat 4061, a liquid inlet valve core 4062, a liquid inlet valve spring 4063 and a liquid inlet valve guide sleeve 4064. The liquid inlet valve seat 4061 is installed in the valve cavity 402, the liquid inlet valve core 4062 is movably arranged in the valve cavity 402 between an open position and a closed position, the liquid inlet valve guide sleeve 4064 provides a guiding effect on the movement of the liquid inlet valve core 4062, and the liquid inlet valve spring 4063 is used to provide a reset elastic force to the liquid inlet valve core 4062.

[0085] The drain valve assembly 407 includes a drain valve seat 4071, a drain valve core 4072, a drain valve spring 4073 and a drain valve guide sleeve 4074. The drain valve seat 4071 is installed in the valve cavity 402, the drain valve core 4072 is movably arranged in the valve cavity 402 between an open position and a closed position, the drain valve guide sleeve 4074 provides a guide for the movement of the drain valve core 4072, and the drain valve spring 4073 is used to provide a reset elastic force to the drain valve core 4072.

[0086] A sleeve 411 is provided between the inlet valve assembly 406 and the drain valve assembly 407, and the sleeve 411 defines a communication portion 4021. The valve body assembly 44 further includes a drain valve cover 408, a cover plate 409, and a fastening bolt 410. The drain valve cover 408 is installed on one side of the valve cavity 402, and the cover plate 409 is fixed to the valve body 401 by the fastening bolt 410, so as to clamp the drain valve cover 408 between the cover plate 409 and the valve body 401.

[0087] Of course, the structural type of the valve body assembly 4 is not limited to Figure 5 The structure shown only needs to be able to realize the functions of liquid inlet and liquid discharge.

[0088] In some embodiments, an oil inlet passage 2011 is provided on the eccentric shaft 201 , and an oil storage groove 2013 is provided on the outer circumference of the eccentric shaft 201 and / or the inner circumference of the cam 202 , and the oil storage groove 2013 is communicated with the oil inlet passage 2011 .

[0089] For example, Figure 2 and Figure 7 As shown, the oil inlet passage 2011 is arranged on the center line of the eccentric shaft 201, an oil storage groove 2013 is arranged on the outer peripheral surface of the eccentric shaft 201, an eccentric shaft oil passage 2012 extending along the extending direction of the plunger hole 106 is arranged on the eccentric shaft 201, and the oil storage groove 2013 is communicated with the oil inlet passage 2011 through the eccentric shaft oil passage 20122012. Of course, the oil storage groove 2013 can also be arranged on the inner peripheral surface of the cam 202, and the oil storage groove 2013 is communicated with the oil inlet passage 2011 through the eccentric shaft oil passage 2012.

[0090] Preferably, the radial piston pump 100 further includes an oil filling joint 104 , which is connected to the second oil seal cover 1031 , and the oil filling joint 104 is communicated with the oil inlet channel 2011 on the eccentric shaft 201 .

[0091] Thus, lubricating oil of a certain pressure can be input into the oil filling joint 104 through a small oil pump such as a gear pump, and the lubricating oil then enters the oil storage tank 2013 through the oil inlet channel 2011 to achieve lubrication between the eccentric shaft 201 and the cam 202, thereby reducing friction, resistance and static pressure balance.

[0092] The inner circumference of the cam 202 can be directly clearance-fitted with the eccentric shaft 201. Of course, a self-lubricating engineering material can also be tightly-fitted on the inner circumference of the cam 202. The engineering material and the eccentric shaft 201 have clearance fit to further reduce friction and wear and increase the life of the friction pair.

[0093] Preferably, the oil storage tank 2013 is arranged around the center line of the eccentric shaft 201 , and a plurality of oil storage tanks 2013 are arranged. A connecting groove 2014 extending along the extension direction of the shaft hole 105 is provided on the outer peripheral surface of the eccentric shaft 201 , and each of the plurality of oil storage tanks 2013 is connected to the connecting groove 2014 .

[0094] Therefore, the lubricating oil entering through the oil inlet channel 2011 can reach each oil storage groove 2013 through the oil inlet channel 2011 and the connecting groove 2014, so as to more effectively realize the lubrication between the eccentric shaft 201 and the cam 202, thereby playing a role in reducing friction and resistance.

[0095] In some embodiments, a cam oil passage 2021 is provided on the cam 202 . The cam oil passage 2021 is communicated with the oil inlet channel 2011 . An opening at one end of the cam oil passage 2021 is provided on the outer peripheral surface of the cam 202 .

[0096] Thus, a portion of the lubricating oil entering from the oil inlet channel 2011 can reach the outer peripheral surface of the cam 202 through the cam oil channel 2021. 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, thereby reducing friction and resistance.

[0097] In some embodiments, a first partial oil channel 30423 is provided on the first mating part 30421, and a second partial oil channel 30424 is provided on the second mating part 30422. The second partial oil channel 30424 passes through the second mating part 30422 along the extension direction of the axial hole 105, and the second partial oil channel 30424 is connected to the oil inlet channel 2011 through the first partial oil channel 30423.

[0098] Therefore, a part of the lubricating oil entering from the oil inlet channel 2011 can reach between the inner cylinder liner 302 and the plunger seat 304 through the cam oil channel 2021, the first part oil channel 30423 and the second part oil channel 30424, lubricating 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, thereby reducing friction and resistance.

[0099] 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.

[0100] When the eccentric shaft 201 rotates under the drive of an external force, for example, the eccentric shaft 201 is connected to the 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 contacts the plunger seat head 3042 and the plunger seat cylinder 3041 of the plunger 303 assembly, that is, the rotational motion of the eccentric shaft 201 is converted into the reciprocating motion of the plunger seat 304. The working rules of the eccentric shaft 201, the cam 202 and the plunger seat 304 are the same as the principle of the crank slider mechanism. The reciprocating motion of the plunger seat 304 will cause the compression and extension of the plunger 303. When the plunger 303 is compressed by the cam 202, the volume of the working chamber 3033 decreases, which is the process of discharging liquid; when the plunger 303 is released (extended) by the cam 202, the volume of the working chamber 3033 increases, which is the process of absorbing liquid.

[0101] An external oil pump can provide lubricating oil with a certain pressure to the radial pump and deliver it to the key friction pairs to achieve the effect of reducing friction and resistance.

[0102] The plunger assembly 3 of the radial piston pump 100 according to the embodiment of the present invention is composed of an elastic plunger 303 and a cylinder sleeve, etc. The plunger assembly 3 can achieve a good sealing effect and isolate the media on both sides of the plunger 303, thereby achieving the effect of separating the working medium from the lubricating oil and water. The working medium can be many kinds, such as water, seawater, oil base, industrial water, organic compounds, etc., and has a wider range of uses.

[0103] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0104] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0105] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0107] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0108] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A radial piston pump, characterized in that: include: A pump body, wherein the pump body has an axial hole, a plunger hole, a liquid inlet and a liquid outlet, wherein the extension direction of the axial hole is perpendicular to the extension direction of the plunger hole, and the plunger holes are provided in plurality, and the plurality of plunger holes are evenly spaced around the axial hole; A camshaft, the camshaft being rotatably disposed in the shaft hole; and A plunger assembly, wherein each plunger hole is provided with the plunger assembly, the plunger assembly comprises a cylinder sleeve, a plunger and a pressure ring, 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 chamber, the plunger barrel is arranged closer to the camshaft than the plunger head in the extending direction of the plunger hole, the plunger head is sealed and connected to the cylinder sleeve, the plunger barrel is arranged spaced apart from the cylinder sleeve in the extending direction of the axial hole, the plunger barrel is movable between a liquid inlet position and a liquid discharge position, the plunger has a relative blocking end and an open end, the blocking end cooperates with the camshaft, the plunger barrel located at the liquid inlet position is released by the camshaft so that the liquid inlet is communicated with the working chamber, the plunger barrel located at the liquid discharge position is compressed by the camshaft so that the liquid discharge is communicated with the working chamber, the pressure ring is connected to the cylinder sleeve, and at least a portion of the plunger head is arranged between the pressure ring and the cylinder sleeve in the extending direction of the plunger hole.

2. The radial piston pump according to claim 1, characterized in that: The plunger assembly further includes a plunger seat, which includes a plunger seat cylinder, a first mating portion and a second mating portion. The plunger seat cylinder is slidably mated with the cylinder sleeve guide along the extension direction of the plunger hole, the first mating portion is mated with the camshaft, and the second mating portion is mated with the blocking end.

3. The radial piston pump according to claim 2, characterized in that: The cylinder sleeve includes an outer cylinder sleeve and an inner cylinder sleeve, the outer cylinder sleeve includes an outer sleeve body, the inner cylinder sleeve includes an inner sleeve body, the outer sleeve body is arranged to be spaced apart from the inner sleeve body along the extension direction of the axial hole, the plunger is arranged in the inner sleeve body, and the plunger seat tube is movably arranged between the outer sleeve body and the inner sleeve body along the extension direction of the plunger hole.

4. The radial piston pump according to claim 3, characterized in that: The camshaft comprises an eccentric shaft and a cam, wherein the cam is sleeved on the eccentric shaft, an oil inlet passage is arranged on the eccentric shaft, an oil storage groove is arranged on the outer circumference of the eccentric shaft and / or the inner circumference of the cam, and the oil storage groove is communicated with the oil inlet passage.

5. The radial piston pump according to claim 4, characterized in that: The cam is provided with a cam oil passage, the cam oil passage is communicated with the oil inlet passage, and one end opening of the cam oil passage is arranged on the outer peripheral surface of the cam.

6. The radial piston pump according to claim 4 or 5, characterized in that: The outer cylinder sleeve further comprises an outer connector, which is arranged closer to the camshaft than the outer casing in the extending 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 includes an inner connecting head, which is arranged closer to the camshaft relative to the inner sleeve body in the extension direction of the plunger hole, an inner sealing ring is provided between the inner connecting head and the hole wall of the plunger hole, and the inner connecting head and the outer connecting head are arranged along the extension direction of the plunger hole, and the inner connecting head is connected to the outer connecting head.

7. The radial piston pump according to claim 6, characterized in that: The plunger seat further includes a plunger seat head, at least a portion of the first mating portion and each of the second mating portions are arranged on the plunger seat head, the at least a portion of the first mating portion is sealingly connected to the plunger seat tube, and the second mating portion is arranged in the inner sleeve.

8. The radial piston pump according to claim 7, characterized in that: The first mating part is provided with a first partial oil passage, the second mating part is provided with a second partial oil passage, the second partial oil passage passes through the second mating part along the extension direction of the axial hole, and the second partial oil passage is connected with the oil inlet passage through the first partial oil passage.

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