Four-quadrant plug-in mounting type plunger pump

Abstract

The utility model discloses a four-quadrant plug-in mounting type plunger pump which has the advantages of high rotating speed, high pressure, high efficiency and on-load starting. The hydraulic cylinder comprises a cylinder body, a through center hole is formed in the radial center of the cylinder body, and N sets of piston mounting cavities are evenly and annularly distributed on the periphery, corresponding to the center hole, of the cylinder body; the plurality of plungers comprise a plurality of first plungers and second plungers, and the non-opposite end surfaces of the first plungers and the second plungers are provided with concave arc-shaped grooves; n groups of transmission roller pins; 2N steel balls; the two groups of bearing track blocks comprise a first bearing track block and a second bearing track block; the flow distribution shaft is provided with 2M groups of runner holes, and the axial positions, corresponding to the two sections of communicating cavities, of each group of runner holes are respectively provided with a conducting groove; a transmission shaft is arranged in the center of the end cover assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pump structures, and particularly relates to a four-quadrant cartridge plunger pump. Background Technique

[0002] Due to the smooth movement, high power density and high dynamic performance of fluid transmission, it has become the preferred transmission mechanism in many application scenarios; as the power element of fluid transmission, the hydraulic pump converts the mechanical energy output by the motor into hydraulic energy, so the hydraulic pump is widely used in mechanical, petroleum, chemical, automotive, shipbuilding, aviation, aerospace and robotics fields along with fluid transmission.

[0003] In the prior art, hydraulic pumps usually start at low pressure and then work at a constant speed. However, today's mobile machinery has put forward higher requirements for the power density of fluid transmission. Therefore, the servo pump control system has developed rapidly in recent years, and the servo pump control system has put forward new requirements for hydraulic pumps: high speed, high pressure, high efficiency, four-quadrant operation and starting with load.

[0004] The four-quadrant operation specifically means that when used as a pump, it can rotate forward and backward; when used as a motor, it can also rotate forward and backward.

[0005] Since traditional hydraulic pumps rely on oil films for support and no longer meet the new requirements, there are also hydraulic pumps with rolling supports on the market. Although these hydraulic pumps can operate in four quadrants and start with load, they cannot simultaneously meet high speed, high pressure and high efficiency, and there are also many problems: either the displacement is too small, or the noise is too large, or the self-priming ability is too weak. Therefore, the existing hydraulic pump structures have hindered the development of the servo pump control system. Therefore, the servo pump control system urgently needs a four-quadrant pump that is easy to integrate, has a large displacement, low noise, strong self-priming ability and can start with load. Summary of the Invention

[0006] Aiming at the above problems, the utility model provides a four-quadrant cartridge plunger pump, which has the advantages of high speed, high pressure, high efficiency and starting with load, and can also meet the requirements of large displacement, low noise and strong self-priming ability.

[0007] A four-quadrant cartridge plunger pump, characterized in that it includes:

[0008] A cylinder block, a through central hole is provided at the radial center of the cylinder block, and N groups of piston mounting cavities are evenly distributed in a ring around the outer circumference of the cylinder block corresponding to the central hole, where N is a natural number. Each group of piston mounting cavities is successively a first plunger cavity, a transmission needle roller placement cavity, and a second plunger cavity along the axial length direction of the cylinder block. A communication cavity is provided in the inner end region of each group of the first plunger cavity and the second plunger cavity close to the transmission needle roller placement cavity to communicate with the central hole;

[0009] A number of plungers, including a number of first plungers and second plungers, with concave arc grooves provided on the non-facing end faces of the first plungers and second plungers;

[0010] N sets of drive needle rollers;

[0011] 2N steel balls;

[0012] Two sets of bearing track blocks, including a first bearing track block and a second bearing track block. The inner surface of the first bearing track block has a first cam rolling bearing track provided corresponding to the outer steel balls of all the first plungers, and the inner surface of the second bearing track block has a second cam rolling bearing track provided corresponding to the outer steel balls of all the plungers;

[0013] A distribution shaft, which is provided with 2M sets of flow channel holes, where M is a natural number. Each set of flow channel holes is provided with conduction grooves at the axial positions corresponding to two sections of communicating cavities respectively;

[0014] And an end cover assembly, with a transmission shaft provided at its central position;

[0015] Each first plunger is inserted into the first plunger cavity, each second plunger is inserted into the second plunger cavity, each drive needle roller is inserted into the drive needle roller placement cavity. The facing ends of the first plunger and the second plunger in the same set of piston installation cavities are assembled and connected through the corresponding drive needle rollers. After the first plunger is inserted into the first plunger cavity, a first piston cavity is formed at the inner end, and after the second plunger is inserted into the second plunger cavity, a second piston cavity is formed at the inner end. The first piston cavity and the second piston cavity are arranged on both sides of the drive needle roller. The outer end of the first plunger is exposed outside the first plunger cavity and is fitted with a corresponding steel ball, and the outer end of the second plunger is exposed outside the second plunger cavity and is fitted with a corresponding steel ball;

[0016] The distribution shaft is inserted into the central hole of the cylinder block and is positioned through the bearings at both ends to form a reliable rotational assembly;

[0017] Both ends of the distribution shaft protrude outward from the central hole in the length direction. The first bearing track block and the second bearing track block are respectively sleeved on the corresponding ends in the length direction of the distribution shaft. One end of the distribution shaft corresponding to the end cover assembly is fixedly connected to the transmission shaft;

[0018] The inner surfaces of the first bearing track block and the second bearing track block are respectively pressed against one end surfaces of corresponding steel balls, and the other end surfaces of each steel ball are respectively embedded in the inner concave arc grooves of corresponding plungers. The first cam rolling bearing track and the second cam rolling bearing track make the distances between two steel balls corresponding to the same piston installation cavity the same at all times, forming a clearance-free rolling bearing structure. When the transmission shaft rotates, the first piston cavity and the second piston cavity alternately change the sizes of the piston cavities.

[0019] Its further features are as follows:

[0020] It further includes a first pressing plate and a second pressing plate. The outer ring area of the first pressing plate is pressed on the outer surface of the first bearing track block, and the central area of the first pressing plate is fixedly connected to the corresponding connection positioning hole of the distribution shaft by screws. The outer ring area of the second pressing plate is pressed on the outer surface of the second bearing track block, and the central area of the second pressing plate is fixedly connected to the corresponding end face of the distribution shaft by a pin;

[0021] The pin passes through the transmission shaft and the second pressing plate and is fixedly connected to the corresponding end face of the distribution shaft, which ensures fewer connecting parts and a simplified structure;

[0022] Bearing installation ring grooves are respectively arranged on the inner walls at both ends in the length direction of the cylinder block corresponding to the central hole, and corresponding bearings are positioned and installed in the bearing installation ring grooves, and the inner rings of the bearings are arranged closely against the distribution shaft;

[0023] Stop positioning rings are respectively arranged at the positions of the inner rings of the respective bearings on the first bearing track block and the second bearing track block, and the corresponding stop positioning rings are arranged closely against the outer ring surfaces of the inner rings to ensure that the distribution shaft drives the first bearing track block and the second bearing track block to rotate synchronously;

[0024] In the same group of piston installation cavities, the first plunger cavity and the second plunger cavity are structures symmetrical about the axial mid-perpendicular plane of the cylinder block, and the first plunger and the second plunger are the same plunger mechanisms;

[0025] The first bearing track block and the second bearing track block are the same bearing track blocks. The first bearing track block and the second bearing track block are deflected 90° from each other in layout. The cam rolling bearing tracks of the first bearing track block and the second bearing track block adopt track surfaces, and the track surfaces adopt M groups of wave crest and wave trough track grooves, so that the whole mechanism is not only rotationally symmetric but also plane symmetric;

[0026] The structure in which the cylinder block and the valve distribution shaft are assembled through bearings adopts a rotationally symmetric structure, so that after the cylinder block, the plunger, the steel ball, the bearing track block, the valve distribution shaft, the pressing plate, the screw, the bearing, the transmission needle roller and the pin are assembled, it is still a rotationally symmetric structure, which is beneficial to the high-speed operation of this plunger pump and weakens the radial force borne by the bearing;

[0027] The 2M groups of flow channel holes of the valve distribution shaft are all blind holes. The 2M groups of flow channel holes are correspondingly arranged with the M groups of wave peak double wave valley track grooves. A balance valve is plugged at the open position of the first pressing plate corresponding to each group of flow channel holes. Two independent parallel flow channels are integrated in the balance valve. One of the flow channels is provided with a one-way valve, and the other flow channel is provided with an overflow valve. The flow directions of the one-way valve and the overflow valve are different from each other.

[0028] After adopting the structure of the present utility model, the transmission shaft of the end cover assembly rotates to drive the valve distribution shaft to rotate, and then drives the bearing track block to rotate. The cam rolling bearing track of the bearing track block is not only used as the variable mechanism of this plunger pump, but also the movement track of the steel ball. For the first time, the design of the rolling bearing track is combined with the design of the rolling friction pair of the plunger pump, which not only simplifies the design structure of the rolling support but also is beneficial to high-speed operation; when each steel ball makes rolling support, it only bears the working pressure of the corresponding plunger, which will reduce the working stress of the steel ball and is beneficial to increasing the working pressure; there is no axial movement gap among the plunger, the steel ball, the bearing track block, and the transmission needle roller during the movement process, which not only reduces the mechanical noise but also improves the self-priming ability of this type of plunger pump; the supporting role of the bearing will greatly reduce the sliding friction between the valve distribution shaft and the central hole of the cylinder block, and the rolling friction between the steel ball and the plunger and the bearing track block, all of which are beneficial to improving the mechanical efficiency of this plunger pump; it has the advantages of high speed, high pressure, high efficiency and starting with load, and at the same time can meet the requirements of large displacement, low noise and strong self-priming ability. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the main view sectional structure of the specific embodiment of the present utility model;

[0030] Figure 2 It is a three-dimensional schematic diagram of the bearing track block in the specific embodiment of the present utility model;

[0031] Figure 3 It is the three-dimensional of the valve distribution shaft in the specific embodiment of the present utility model Figure 1 ;

[0032] Figure 4 It is the three-dimensional of the valve distribution shaft in the specific embodiment of the present utility model Figure 2 ;

[0033] Figure 5 It is Figure 1 the schematic diagram of the E-E sectional structure of;

[0034] Figure 6 For Figure 1 the schematic diagram of the F-F sectional structure;

[0035] The names corresponding to the serial numbers in the figure are as follows:

[0036] Cylinder block 1, central hole 101, bearing mounting ring groove 102, first plunger cavity 103, transmission needle roller placement cavity 104, second plunger cavity 105, communication cavity 106, first piston cavity 107, second piston cavity 108, plunger 2, steel ball 3, bearing track block 4, double-wave peak and double-wave valley track groove 41, stop positioning ring 42, distribution shaft 5, flow passage hole 51, conduction groove 52, first pressing plate 6, screw 7, balance valve 8, bearing 9, transmission needle roller 10, pin 11, end cover assembly 12, transmission shaft 121, second pressing plate 13. Specific embodiments

[0037] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0040] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0041] A four-quadrant plug-in type plunger pump, as shown in Figures 1 - 6 , which includes a cylinder block 1, a plurality of plungers 2, eight groups of transmission needle rollers 10, sixteen steel balls 3, two groups of bearing track blocks 4, a distribution shaft 5, and an end cover assembly 12, that is, N is equal to 8;

[0042] A through center hole 101 is provided at the radial center of the cylinder block 1. Eight groups of piston mounting cavities are evenly distributed in a ring shape on the outer periphery of the cylinder block 1 corresponding to the center hole 101. Each group of piston mounting cavities successively includes a first plunger cavity 103, a transmission needle roller placement cavity 104, and a second plunger cavity 105 along the axial length direction of the cylinder block. A communication cavity 106 is provided in the inner end region of each first plunger cavity 103 and second plunger cavity 105 close to the transmission needle roller placement cavity 104 to communicate with the center hole 101;

[0043] A number of plungers 2 include a number of first plungers and second plungers. Concave arc grooves are provided on the non-facing end faces of the first plungers and second plungers;

[0044] Part of the steel balls 3 are respectively embedded in the concave arc grooves of the corresponding plungers to form a non-clearance rolling bearing structure;

[0045] Two groups of bearing track blocks 4 include a first bearing track block and a second bearing track block. The inner surface of the first bearing track block has a first cam rolling bearing track provided corresponding to the steel balls on the outer sides of all the first plungers, and the inner surface of the second bearing track block has a second cam rolling bearing track provided corresponding to the steel balls on the outer sides of all the plungers;

[0046] The distribution shaft 5 is provided with four groups of flow channel holes 51. Each group of flow channel holes 51 is respectively provided with a conduction groove 52 at the axial positions corresponding to two sections of the communication cavity 106, that is, M is equal to 4;

[0047] A transmission shaft 121 is provided at the center position of the end cover assembly 12;

[0048] Each first plunger is inserted into the first plunger cavity 103, each second plunger is inserted into the second plunger cavity 104, and each transmission needle roller 10 is inserted into the transmission needle roller placement cavity 104. The facing ends of the first plunger and the second plunger in the same group of piston mounting cavities are fixedly connected through the corresponding transmission needle roller 10. After the first plunger is inserted into the first plunger cavity 103, a first piston cavity 107 is formed at the inner end, and after the second plunger is inserted into the second plunger cavity 105, a second piston cavity 108 is formed at the inner end. The first piston cavity 107 and the second piston cavity 108 are arranged on both sides of the transmission needle roller 10. The outer end of the first plunger is exposed outside the first plunger cavity 103 and is embedded with a corresponding steel ball 3, and the outer end of the second plunger is exposed outside the second plunger cavity 105 and is embedded with a corresponding steel ball 3;

[0049] The distribution shaft 5 is inserted into the center hole 101 of the cylinder block 1 and is assembled and positioned through the bearings 9 at both ends to form a reliable rotational assembly;

[0050] Both ends of the distribution shaft 5 in the length direction protrude outward from the center hole 101. The first bearing track block and the second bearing track block are respectively fixedly sleeved on the corresponding ends in the length direction of the distribution shaft 5. One end of the distribution shaft 5 corresponding to the end cover assembly 12 is fixedly connected to the transmission shaft 121.

[0051] The inner surfaces of the first bearing track block and the second bearing track block are respectively pressed and arranged on one end surface of the corresponding steel ball 3. The other end surface of each steel ball 3 is respectively embedded in the inner concave arc groove of the corresponding plunger. The first cam rolling bearing track and the second cam rolling bearing track make the distance between the two steel balls 3 corresponding to the same piston installation cavity the same at all times, forming a clearance-free rolling bearing structure. When the transmission shaft 121 rotates, the first piston cavity 107 and the second piston cavity 108 alternately change the size of the piston cavity.

[0052] In specific implementation, a four-quadrant plug-in type plunger pump further includes a first pressing plate 6 and a second pressing plate 13. The outer ring area of the first pressing plate 6 is pressed on the outer surface of the first bearing track block. The central area of the first pressing plate 6 is fixedly connected to the corresponding connection positioning hole of the distribution shaft 5 through a screw 7. The outer ring area of the second pressing plate 13 is pressed on the outer surface of the second bearing track block. The central area of the second pressing plate 13 is fixedly connected to the corresponding end surface of the distribution shaft 5 through a pin 11.

[0053] The pin 11 passes through the transmission shaft 121 and the second pressing plate 13 and is then fixedly connected to the corresponding end surface of the distribution shaft 5, which ensures that the number of connecting parts is reduced and the structure is simplified.

[0054] Bearing mounting ring grooves 102 are respectively arranged on the inner walls at both ends in the length direction of the cylinder block 1 corresponding to the center hole 101. The corresponding bearings 9 are positioned and installed in the bearing mounting ring grooves 102, and the inner rings of the bearings 9 are closely arranged against the distribution shaft 5.

[0055] Stop positioning rings 42 are respectively arranged at the positions of the inner rings of the first bearing track block and the second bearing track block corresponding to their respective bearings. The corresponding stop positioning rings 42 are closely arranged against the outer ring surface of the inner ring of the bearing 9 to ensure that the distribution shaft 5 drives the first bearing track block and the second bearing track block to rotate synchronously.

[0056] In a specific embodiment, see Figures 1 - 6 : The first plunger cavity 103 and the second plunger cavity 105 in the same group of piston installation cavities are symmetric structures with respect to the axial mid-perpendicular plane of the cylinder block 1. The first plunger and the second plunger are the same plunger 2.

[0057] The first bearing track block and the second bearing track block are the same bearing track block 4. When arranged, the first bearing track block and the second bearing track block are deflected from each other by 90°. The cam rolling bearing tracks of the first bearing track block and the second bearing track block adopt a track surface, and its track surface adopts a double-wave-peak and double-wave-trough track groove 41, making the entire mechanism not only rotationally symmetric but also plane-symmetric;

[0058] The structure in which the cylinder block 1 and the valve plate 5 are assembled through the bearing 9 adopts a rotationally symmetric structure, so that after the cylinder block 1, the plunger 2, the steel ball 3, the bearing track block 4, the valve plate 5, the first pressing plate 6, the second pressing plate 13, the screw 7, the bearing 9, the transmission needle roller 10 and the pin 11 are assembled, it is still a rotationally symmetric structure, which is beneficial to the high-speed operation of this plunger pump and weakens the radial force borne by the bearing;

[0059] The four groups of flow channel holes of the valve plate 5 are all blind holes. A balance valve 8 is plugged at the open position corresponding to the first pressing plate 6 for each group of flow channel holes. Two groups of independent parallel flow channels are integrated in the balance valve 8. One group of flow channels is provided with a check valve, and the other group of flow channels is provided with an overflow valve. The flow directions of the check valve and the overflow valve are different from each other.

[0060] During specific implementation, the two end faces of the transmission needle roller 10 are closely attached to the bottoms of the two ends of the plunger 2; the bearing 9 is installed in the central bearing chambers at both ends of the cylinder block 1; the valve plate 5 is installed in the central hole 101 of the cylinder block 1; the outer cylindrical surface of the valve plate 5 and the inner ring surface of the bearing 9 are interference-fitted, so that the outer cylindrical surface of the valve plate 5 and the inner surface of the central hole of the cylinder block 1 are clearance-fitted; the bearing track block 4 is installed at the corresponding installation positions at both ends of the valve plate 5, so that the outer end face of the bearing track block 4 is flush with the end face of the valve plate 5, and the two bearing track blocks 4 at both ends are staggered by 90°; the stop positioning ring 42 on the inner end face of the bearing track block 4 presses the end face of the inner ring of the bearing 9; the steel ball 3 is installed between the ball hole on the outer end face of the plunger 2 and the track of the bearing track block 4 and always keeps rolling contact; the balance valve 8 is installed in the flow channel hole 51 of the valve plate 5; the first pressing plate 6 is placed on the end face of the valve plate 5 and tightly presses the outer end face of the bearing track block 4; the screw 7 is fixed in the threaded hole on the end face of the valve plate 5, and the end face of the screw head of the screw 7 is closely attached to the end face of the pressing plate 6 through threaded connection; the end cover assembly 12 is connected to the cylinder block 1 through threads; one end of the pin 11 is installed in the pin hole on the end face of the valve plate 5, and the other end is installed in the pin hole of the transmission shaft 121 in the end cover assembly 12.

[0061] The working mode of the specific embodiment is as follows: After assembly, when the drive shaft 121 in the end cover assembly 12 of this plunger pump is driven by the motor to rotate clockwise, the drive shaft drives the bearing track block 4, the distribution shaft 5, the pressure plate 6, the screw 7, the balance valve 8, the bearing 9 and the pin 11 to rotate clockwise together. Due to the constraint of the mechanical structure, the plunger 2, the steel ball 3 and the drive needle roller 10 will move back and forth synchronously. When the plunger 2 at the left end of the drive needle roller 10 retracts (extends) from the outermost end (bottom end) into the plunger hole of the cylinder block 1, the cavity formed by the plunger 2 and the plunger hole of the cylinder block 1 will be connected to the oil discharge (oil suction) distribution window of the distribution shaft 5 to achieve oil discharge (oil suction). When the plunger 2 at the right end extends (retracts) from the bottom end (outer end) into the plunger hole of the cylinder block 1, the cavity formed by the plunger 2 and the plunger hole of the cylinder block 1 will be connected to the oil suction (oil discharge) distribution window of the distribution shaft 5 to achieve oil suction (oil discharge). When the plungers 2 at both ends of the drive needle roller 10 are located at the outermost end or the bottom end, the distribution shaft 5 is at the initial position. When the distribution shaft 5 rotates 90° from the initial point, the plungers 2 at both ends of the drive needle roller 10 will each complete one oil suction or oil discharge. When the distribution shaft 5 rotates one circle from the initial point, the plungers 2 at both ends of the drive needle roller 10 will alternately complete two oil suction and oil discharge, that is, port A sucks oil and port B discharges oil. When the motor drives the drive shaft to rotate counterclockwise, port B sucks oil and port A discharges oil. When the pressure oil enters from port A and discharges from port B, the drive shaft will drive the motor to rotate clockwise to generate electricity. When the pressure oil enters from port B and discharges from port A, the drive shaft will drive the motor to rotate counterclockwise to generate electricity. This is the working principle of this four-quadrant plunger pump.

[0062] The key features of the present invention: This plunger pump adopts a rotationally symmetric structure design, in which the bearing track block 4 is as Figure 2The shown orbital surface adopts a double-peak and double-valley design, making it not only rotationally symmetric but also plane symmetric. The cylinder block 1 and the port plate 5 adopt a rotationally symmetric structural design, so that after the cylinder block 1, the plunger 2, the steel ball 3, the bearing track block 4, the port plate 5, the pressure plate 6, the screw 7, the balance valve 8, the bearing 9, the drive needle roller 10 and the pin 11 are assembled, it is still a rotationally symmetric structure, which is beneficial to the high-speed operation of this plunger pump and weakens the radial force borne by the bearing 9; the bearing track block 4 not only serves as the variable mechanism of this plunger pump, but also is the movement track of the steel ball 3, realizing the combination of the rolling bearing track design and the rolling friction pair design of the plunger pump for the first time, which not only simplifies the design structure of the rolling support but also is beneficial to high-speed operation; when each steel ball 3 makes rolling support, it only bears the working pressure of the corresponding plunger 2, which will reduce the working stress of the steel ball 3 and is beneficial to increasing the working pressure; there is no axial movement clearance among the plunger 2, the steel ball 3, the bearing track block 4 and the drive needle roller 10 during the movement process, which not only reduces the mechanical noise but also improves the self-priming ability of this type of plunger pump with the above-mentioned rolling support; the supporting effect of the bearing 9 will greatly reduce the sliding friction between the port plate 5 and the inner hole of the center of the cylinder block 1, and the rolling friction between the steel ball 3 and the plunger 2 and the bearing track block 4, all of which are beneficial to improving the mechanical efficiency of this plunger pump; when the pressure at the oil drain port exceeds the pressure at the oil suction port, the check valve in the balance valve 8 opens to reduce the pressure at the oil discharge port to prevent the oil seal in the end cover assembly 12 from being damaged; when the pressure at the oil outlet exceeds the safety pressure set by the balance valve 8, the relief valve in the balance valve 8 opens to relieve pressure to achieve mechanical safety protection; the integrated design of the balance valve 8 effectively improves the power density of this plunger pump.

[0063] In a specific embodiment, the variable mechanism of the high-speed, high-pressure and high-efficiency four-quadrant cartridge-type plunger pump with a symmetric structure adopts a planar cam rolling bearing track structure design, which not only simplifies the structure but also can reduce the mechanical noise and improve the efficiency; the reciprocating movement of the plunger is completed by the mechanical transmission of two planar cam rolling bearing tracks arranged in a staggered and symmetric manner. This structural design not only cancels the spring but also has no axial movement clearance, so that this four-quadrant cartridge-type plunger pump not only has the advantages of high speed, high pressure, high efficiency and load starting, but also can meet the requirements of large displacement, low noise and strong self-priming ability; thus, this plunger pump has better practicability and market prospects.

[0064] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0065] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A four-quadrant cartridge plunger pump, characterized in that: It includes: A cylinder body, wherein a central hole is provided at the radial center of the cylinder body, and N groups of piston installation cavities are evenly distributed around the outer circumference of the cylinder body corresponding to the central hole, wherein N is a natural number, and each group of piston installation cavities is sequentially a first plunger cavity, a transmission needle roller placement cavity, and a second plunger cavity along the axial length direction of the cylinder body, and a connecting cavity is provided in the inner end area of ​​each group of the first plunger cavity and the second plunger cavity close to the transmission needle roller placement cavity to connect with the central hole; A plurality of plungers, including a plurality of first plungers and a plurality of second plungers, wherein the non-facing end surfaces of the first plungers and the second plungers are both provided with an inwardly concave arc groove; N groups of transmission needle rollers; 2N steel balls; Two sets of bearing track blocks, including a first bearing track block and a second bearing track block, wherein the inner surface of the first bearing track block has a first cam rolling bearing track corresponding to the outer steel balls of all the first plungers, and the inner surface of the second bearing track block has a second cam rolling bearing track corresponding to the outer steel balls of all the plungers; The flow distribution shaft is provided with 2M groups of flow channel holes, where M is a natural number, and each group of flow channel holes is provided with a conducting groove at the axial position corresponding to the two sections of the connecting cavity; and an end cover assembly, a transmission shaft being disposed at a center position thereof; Each first plunger plug is installed in the first plunger cavity, each second plunger plug is installed in the second plunger cavity, each transmission needle is inserted in the transmission needle placement cavity, and the facing ends of the first plunger and the second plunger corresponding to the same group of piston installation cavities are connected by corresponding transmission needle assembly, the first plunger plug is installed in the first plunger cavity to form a first piston cavity at the rear inner end, and the second plunger plug is installed in the second plunger cavity to form a second piston cavity at the rear inner end, the first piston cavity and the second piston cavity are arranged at both sides of the transmission needle, the outer end of the first plunger is exposed in the first plunger cavity and embedded with a corresponding steel ball, and the outer end of the second plunger is exposed in the second plunger cavity and embedded with a corresponding steel ball; The distribution shaft is inserted into the center hole of the cylinder body and is positioned by the bearing assembly at both ends to form a reliable rotation assembly; The two ends of the distribution shaft in the length direction are respectively protruding outward from the central hole, the first bearing track block and the second bearing track block are respectively fixedly sleeved on the corresponding ends in the length direction of the distribution shaft, and one end of the distribution shaft corresponding to the end cover assembly is fixedly connected to the transmission shaft; The inner surfaces of the first bearing track block and the second bearing track block are respectively pressed onto one end surface of the corresponding steel ball, and the other end surface of each steel ball is respectively embedded in the concave arc groove of the corresponding plunger. The first cam rolling bearing track and the second cam rolling bearing track make the distance between the two steel balls corresponding to the same piston mounting cavity always the same, forming a gapless rolling bearing structure. The first cam rolling bearing track and the second cam rolling bearing track make the first piston cavity and the second piston cavity alternately change the size of the piston cavity when the transmission shaft rotates.

2. A four-quadrant cartridge plunger pump according to claim 1, characterized in that: It also includes a first pressure plate and a second pressure plate. The outer ring area of ​​the first pressure plate is pressed onto the outer surface of the first bearing track block. The central area of ​​the first pressure plate is fastened to the corresponding connecting positioning hole of the distribution shaft by screws. The outer ring area of ​​the second pressure plate is pressed onto the outer surface of the second bearing track block. The central area of ​​the second pressure plate is fixed to the corresponding end surface of the distribution shaft by pins.

3. A four-quadrant cartridge plunger pump according to claim 2, characterized in that: The pin passes through the transmission shaft and the second pressure plate and is fixedly connected to the corresponding end surface of the distribution shaft.

4. A four-quadrant cartridge plunger pump according to claim 1, characterized in that: The inner walls of the cylinder body at both ends in the length direction corresponding to the center hole are respectively provided with bearing mounting ring grooves, the corresponding bearings are positioned and installed in the bearing mounting ring grooves, and the inner ring of the bearing is arranged closely against the distribution shaft.

5. A four-quadrant cartridge plunger pump according to claim 4, characterized in that: The first bearing track block and the second bearing track block are respectively provided with stopper positioning rings corresponding to the inner ring positions of their respective bearings, and the corresponding stopper positioning rings are arranged closely against the outer ring surface of the inner ring.

6. A four-quadrant cartridge plunger pump according to claim 1, characterized in that: The first plunger cavity and the second plunger cavity in the same group of piston mounting cavities are symmetrical structures about the axial mid-vertical plane of the cylinder body, and the first plunger and the second plunger are the same plunger mechanism.

7. A four-quadrant cartridge plunger pump according to claim 6, characterized in that: The first bearing track block and the second bearing track block are identical bearing track blocks. The first bearing track block and the second bearing track block are offset 90° from each other when arranged. The cam rolling bearing tracks of the first bearing track block and the second bearing track block adopt track curved surfaces, and the track curved surfaces adopt M groups of crest and trough track grooves.

8. A four-quadrant cartridge plunger pump according to claim 7, characterized in that: The structure in which the cylinder body and the distribution shaft are assembled through the bearing adopts a rotationally symmetrical structure, so that the cylinder body, plunger, steel ball, bearing track block, distribution shaft, pressure plate, screw, bearing, transmission needle roller and pin are still a rotationally symmetrical structure after being assembled.

9. A four-quadrant cartridge plunger pump according to claim 1, characterized in that: The 2M groups of flow channel holes of the distribution shaft are all blind holes, and the 2M groups of flow channel holes are arranged corresponding to the M groups of wave peak and double trough track grooves. Each group of flow channel holes is plugged with a balancing valve corresponding to the open position of the first pressure plate. Two groups of independent parallel flow channels are integrated in the balancing valve, one group of flow channels is provided with a one-way valve, and the other group of flow channels is provided with an overflow valve, and the flow directions of the one-way valve and the overflow valve are different.

Images