A low pulsation, low impact, modular hydraulic piston pump / motor cylinder

Abstract

The application discloses a low-pulsation and low-impact modular hydraulic plunger pump / motor cylinder, which comprises a plunger cylinder and a modular flow distribution plane structure; an annular groove is formed on the flow distribution end face of the plunger cylinder, and the annular groove is uniformly distributed with plunger holes, inner radial grooves and outer radial grooves in the circumferential direction; the modular flow distribution plane structure comprises a circular flow distribution plate and an inner end face boss and an outer end face boss which extend inward and outward along the radial direction of the flow distribution plate; the inner end face boss is matched with the inner radial groove, and the outer end face boss is matched with the outer radial groove, so that the modular flow distribution plane structure is nested in the annular groove of the plunger cylinder, and a flow distribution plane of the cylinder structure is formed; a plurality of flow distribution windows are formed on the flow distribution plate and are uniformly distributed in the circumferential direction, and the flow distribution windows are one-to-one corresponding to the plunger holes; and a damping structure is formed on the end position of the flow distribution window. The application can realize modularization, and can realize the seamless switching of the open and closed pumps and between the pump and the motor.

Description

Technical Field

[0001] This invention relates to the field of hydraulic components and fluid transmission engineering, specifically to a modular hydraulic piston pump / motor cylinder with low pulsation and low impact. Background Technology

[0002] Hydraulic piston pumps / motors are widely used energy conversion devices in various hydraulic systems. The cylinder block, distributor plate, and pistons are the heart components of the piston pump / motor, and their structural design ultimately determines the output performance of the pump / motor. Due to the unique working principle and method of piston pumps / motors, they often experience flow pulsations and pressure shocks during operation.

[0003] To address the aforementioned issues, damping or vibration-damping structures are typically incorporated into the distributor plate to buffer pulsations and impacts, thereby improving system stability. However, currently, there are no vibration-damping structures installed at the cylinder block level to buffer flow pulsations and pressure shocks in piston pumps / motors. Additionally, as... Figure 1 As shown, existing plunger pump / motor cylinders are integrated structures, achieving flow distribution through contact and cooperation between the flow distribution end face on the cylinder and the flow distribution plate. When changing the rotation direction of the cylinder or switching to other flow distribution scenarios, the entire cylinder needs to be replaced, resulting in high costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a modular hydraulic piston pump / motor cylinder block with low pulsation and low impact. By setting a vibration damping structure on the cylinder block, the flow pulsation and internal pressure impact of the piston pump / motor can be further buffered to improve the working performance of the piston pump / motor. Moreover, the cylinder block of this invention can realize a series of flow distribution plane structures for a single piston cylinder, thereby selecting different flow distribution plane structures according to different scenarios and achieving modular configuration.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A modular hydraulic piston pump / motor cylinder body with low pulsation and low impact, comprising: a piston cylinder and a modular flow distribution plane structure;

[0007] The plunger cylinder has an annular groove on its distribution end face. Several plunger holes, inner radial grooves and outer radial grooves are evenly distributed in the annular groove along the circumferential direction. Each plunger hole corresponds to an inner radial groove and an outer radial groove. The center lines of the inner radial groove and the outer radial groove corresponding to each plunger hole pass through the center of the plunger hole.

[0008] The modular flow distribution plane structure is installed in the annular groove on the flow distribution end face of the plunger cylinder, which comprises a circular ring-shaped flow distribution plate and a plurality of inner end face bosses and outer end face bosses extending inward and outward along the radial direction of the flow distribution plate respectively; the inner end face bosses are matched with the inner radial grooves, and the outer end face bosses are matched with the outer radial grooves, so that the modular flow distribution plane structure is nested in the annular groove of the plunger cylinder, and the two form the flow distribution plane of the cylinder structure.

[0009] A plurality of flow distribution windows are arranged on the flow distribution plate in a circumferential direction, and the flow distribution windows correspond to the plunger holes one by one; and a damping structure is arranged at the end position of the flow distribution window.

[0010] Further, the damping structure is selected from any one or a combination of a plurality of V-shaped grooves, U-shaped grooves, V-shaped and U-shaped combined grooves, or damping holes.

[0011] Further, the flow distribution window is a waist-shaped through hole, and the damping structure is arranged at the arc end of the waist-shaped through hole.

[0012] Further, the damping structure is located at one end of the flow distribution window.

[0013] Further, the damping structure is located at the left and right ends of the flow distribution window, and is arranged symmetrically with respect to the flow distribution window.

[0014] Further, the damping structure is arranged at the end position of the flow distribution window on both the front and back end faces of the flow distribution plate.

[0015] Further, all the damping structures are located at the same end of the corresponding flow distribution window, and all the damping structures are completely the same in shape.

[0016] Further, the center line of the damping structure passes through the reference circle of the flow distribution window.

[0017] Further, a threaded hole one is arranged in the inner radial groove, a threaded hole two is arranged in the outer radial groove, an inner end face boss counterbore is arranged on the inner end face boss, and an outer end face boss counterbore is arranged on the outer end face boss, so that the modular flow distribution plane structure is fixed in the annular groove of the plunger cylinder by means of fasteners passing through the threaded hole one and the inner end face boss counterbore, and the threaded hole two and the outer end face boss counterbore.

[0018] The beneficial effects of the present application are as follows:

[0019] The present application makes full use of the pre-pressurization and pressure relief characteristics of fluid, and utilizes the flow area change characteristics of the damping structure to achieve the purpose of buffering flow pulsation and pressure impact, and further improves the working performance of the hydraulic piston pump / motor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the existing piston pump / motor cylinder body.

[0021] Figure 2 It is a structural schematic diagram of the piston pump / motor cylinder body of the embodiment of the present application.

[0022] Figure 3 It is an assembly schematic diagram of the piston pump / motor cylinder body of the embodiment of the present application.

[0023] Figure 4 It is the counterclockwise rotating open pump cylinder body structure of the embodiment of the present application.

[0024] Figure 5 It is the clockwise rotating open pump cylinder body structure of the embodiment of the present application.

[0025] Figure 6 It is the closed pump or motor cylinder body structure of the embodiment of the present application.

[0026] Figure 7 It is the front and back of the flow distribution plane structure 2 of the embodiment of the present application.

[0027] In the figure, the piston cylinder 1, the modular flow distribution plane structure 2, the annular groove 101, the piston hole 102, the inner radial groove 103, the outer radial groove 104, the threaded hole one 105, the threaded hole two 106, the flow distribution plate 201, the flow distribution window 202, the inner end face boss 203, the outer end face boss 204, the inner end face boss counterbore 205, and the outer end face boss counterbore 206. DETAILED DESCRIPTION

[0028] The present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, as understood by those skilled in the art, and it should be understood that the specific embodiments described herein are intended for the purpose of explanation only and are not intended to limit the present application.

[0029] As Figure 2 and 3As shown, the low-pulsation and low-impact modular hydraulic piston pump / motor cylinder of the embodiment comprises a piston cylinder 1 and a modular flow distribution plane structure 2.

[0030] The flow distribution end face of the piston cylinder 1 is provided with an annular groove 101, and 9 piston holes 102 are uniformly distributed in the circumferential direction in the annular groove 101. An inner radial groove 103 and an outer radial groove 104 are symmetrically arranged on both sides of the piston hole 102. Each piston hole 102 corresponds to an inner radial groove 103 and an outer radial groove 104, and the center lines of the inner radial groove 103 and the outer radial groove 104 corresponding to each piston hole 102 pass through the center of the piston hole 102. A threaded hole one 105 is further provided in each inner radial groove 103, and a threaded hole two 106 is provided in each outer radial groove 104.

[0031] The modular flow distribution plane structure 2 is assembled in the annular groove 101 on the flow distribution end face of the piston cylinder 1, and comprises a circular flow distribution plate 201 and 9 inner end face bosses 203 and outer end face bosses 204 extending inward and outward along the radial direction of the flow distribution plate 201. The flow distribution plate 201 is provided with 9 flow distribution windows 202 uniformly distributed in the circumferential direction, and the flow distribution windows 202 correspond one-to-one to the piston holes 102 on the piston cylinder 1. The flow distribution plate 201 is provided with a damping structure at the end position of the flow distribution window 202. An inner end face boss counterbore 205 is provided on each inner end face boss 203, and an outer end face boss counterbore 206 is provided on each outer end face boss 204. The inner end face boss 203 is embedded in the inner radial groove 103, and the outer end face boss 204 is embedded in the outer radial groove 104. The modular flow distribution plane structure 2 is fixed in the annular groove of the piston cylinder 1 by fastening the threaded hole one 105 and the inner end face boss counterbore 205, and the threaded hole two 106 and the outer end face boss counterbore 206 with fasteners, so that the flow distribution windows 202 correspond one-to-one to the piston holes 102 on the piston cylinder 1, and the flow distribution of the piston pump / motor is realized.

[0032] In addition, the flow distribution window 202, as Figure 3 shown, is preferably a waist-shaped through hole, and the damping structure is provided at the arc end of the waist-shaped through hole. As for the number of piston holes, the embodiment is described by taking 9 as an example, and the actual number of piston holes can be determined according to the size of the reference circle, the diameter of the piston, and the displacement of the hydraulic piston pump / motor. The actual number of piston holes can be 5 / 7 / 9 / 11 / 13, and the fixed included angle between any two circular holes is 72° / 51.43° / 40° / 32.73° / 27.69°. Similarly, the number of flow distribution windows 202 provided on the modular flow distribution plane structure must be consistent with the number of piston holes. The shape, size, and other structural parameters of the flow distribution window can be set according to actual needs or theoretical calculations. The flow distribution window 202 and the piston hole are located on the same reference circle.

[0033] As shown in Figure 3 , the damping structure opened at the end position of the flow distribution window 202 can be a V-shaped groove, a U-shaped groove, a V-shaped and U-shaped combined groove, or any one or a combination of several of the damping holes. The center line of the damping groove or damping hole must pass through the indexing circle of the plunger hole opened in the cylinder, so as to facilitate the change of the flow area characteristics of the damping structure. For relatively stable operating conditions, the damping structure can use a single groove or hole structure. For relatively severe operating conditions, the damping structure can use a combination of grooves and holes to adapt to complex changes.

[0034] Finally, for different types of plunger pumps and different rotation directions, the setting position of the damping structure is as follows:

[0035] For the damping structure of an open pump, it must be distributed on one side or in one direction, that is, all the damping structures on the flow distribution window 202 are located on the same side of the flow distribution window, and the opening direction must match the direction of rotation of the main shaft. As shown in Figure 4 , for example, the V-shaped groove (the same below), the opening direction of the damping structure is "A" when the open pump rotates counterclockwise. As shown in Figure 5 , the opening direction of the damping structure is "B" when it rotates clockwise. The purpose of this setting is that when the cylinder rotates, the first contact with the flow distribution window hole of the flow distribution plate is no longer the flow distribution window 202, but the corresponding damping structure, which can introduce or discharge the oil in the flow distribution plate flow distribution window hole or the plunger hole 102 in advance, fully utilize the pre-pressurization / decompression characteristics of the fluid, and achieve the purpose of buffering flow pulsation and pressure impact.

[0036] For the damping structure of a closed pump or motor, it can rotate in both directions, so the opening direction must be bidirectional and symmetrical, as shown in Figure 6 . It should be noted here that the size and related dimensions of the bidirectional damping structure need to be matched and calculated with the plunger hole 102 and the flow distribution window 202. The damping structure should not be too large to cause internal leakage of the cylinder and affect the working efficiency of the pump or motor.

[0037] Based on the above two cases, the damping structure can be opened on both the front and back end faces of the modular flow distribution plane structure 2 to meet the conversion requirements between hydraulic plunger pumps and motors, as shown in Figure 7It is noted that the setting is different for the open pump rotating counterclockwise or clockwise, as follows: the first group corresponds to the open pump rotating counterclockwise, the front surface is set as the one-way damping structure (A direction), and the back surface is set as the two-way damping structure in the symmetrical form. The second group corresponds to the open pump rotating clockwise, the front surface is set as the one-way damping structure (B direction), and the back surface is set as the two-way damping structure in the symmetrical form. With such a setting, for the same working condition, only two groups of modular flow distribution plane structures 2 need to be adapted, that is, the working use of the open pump (clockwise and counterclockwise rotation), the closed pump and the motor can be met.

[0038] In addition, the flow distribution plane structure 2 with damping structures on both front and back surfaces needs to be ground with the end surface of the flow distribution disc, so that the open pump can be converted into the closed pump / motor.

[0039] In order to adapt to the modular low-pulse and low-impact hydraulic piston pump / motor cylinder of the present application, the waist-shaped oil port end on the flow distribution disc matched with the cylinder can also be provided with a damping structure, but the damping structure on the flow distribution disc must be consistent with the damping structure on the modular flow distribution plane structure 2 of the present application. In this way, the flow area of the damping structure can be matched with each other, and the damping effect of the damping structure can be maximized.

[0040] The present application fully utilizes the pre-pressurization and pressure relief characteristics of the fluid, and the flow area change characteristics of the damping structure, so as to achieve the purpose of buffering the flow pulsation and pressure impact, and further improve the working performance of the hydraulic piston pump / motor.

[0041] The present application can realize the serialization of the modular flow distribution plane structure 2, and can select and match the damping structure according to the characteristics of the working condition of the hydraulic piston pump / motor. In addition, the open pump, the closed pump and the motor can be converted between each other, and the replacement is convenient and efficient, so as to realize the seamless switching between the hydraulic piston pump and the motor.

[0042] Those skilled in the art can understand that the above description is only a preferred example of the application and is not used to limit the application, although the application has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions recorded in the foregoing examples or replace some technical features with equivalent ones. Any modification, equivalent replacement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A low pulsation, low impact, modular hydraulic piston pump or motor cylinder characterized by, The utility model relates to a kind of modularization of plunger cylinder and modularization of flow distribution plane structure, including: Plunger cylinder (1) and modularization of flow distribution plane structure (2); Wherein, annular groove (101) is opened on the flow distribution end face of the plunger cylinder (1), and the annular groove (101) is uniformly distributed with several plunger holes (102), inner radial groove (103) and outer radial groove (104) in circumferential direction, each plunger hole (102) corresponds one inner radial groove (103) and one outer radial groove (104), and the center line of each plunger hole (102) corresponding inner radial groove (103) and outer radial groove (104) all pass through the center of the plunger hole (102); The modularization of flow distribution plane structure (2) is installed in the annular groove (101) on the flow distribution end face of the plunger cylinder (1), and it includes circular flow distribution plate (201) and multiple inner end face boss (203) and outer end face boss (204) extending inwards and outwards along the radial direction of the flow distribution plate (201) respectively;The inner end face boss (203) and inner radial groove (103) cooperate, and the outer end face boss (204) cooperates with the outer radial groove (104), so as to nest the modularization of flow distribution plane structure (2) in the annular groove of the plunger cylinder (1), and the two form the flow distribution plane of cylinder structure. The flow distribution plate (201) is provided with a plurality of flow distribution windows (202) uniformly distributed in the circumferential direction, and the flow distribution windows (202) correspond one by one to the plunger holes (102);The flow distribution plate (201) is provided with a damping structure at the end position of the flow distribution window (202).

2. The low-pulsation, low-impact, modular, hydraulic, piston-pump or motor-cylinder block of claim 1, wherein, The damping structure is selected from any one or a combination of V-shaped groove, U-shaped groove, V-shaped and U-shaped combined groove, or damping hole.

3. A low-pulsation, low-impact, modular hydraulic piston pump or motor cylinder according to claim 2, characterized in that, The flow distribution window (202) is a waist-shaped through hole, and the damping structure is provided at the arc end of the waist-shaped through hole.

4. The low-pulsation, low-impact, modular, hydraulic, piston-pump or motor cylinder of claim 3, wherein, The damping structure is located at one end of the flow distribution window (202).

5. The low-pulsation, low-impact, modular, hydraulic, piston-pump or motor cylinder of claim 3, wherein, The damping structure is located at the left and right ends of the flow distribution window (202) and is symmetrically arranged relative to the flow distribution window (202).

6. A low-pulsation, low-impact, modular hydraulic piston pump or motor cylinder according to claim 3 or 4 or 5, characterized in that, The damping structure is provided at the end position of the flow distribution window (202) on both the front and back surfaces of the flow distribution plate (201).

7. The low-pulsation, low-impact, modular, hydraulic, piston-pump or motor-cylinder block of claim 3, wherein, All damping structures are located at the same end of the corresponding flow distribution window (202), and all damping structures are completely the same in shape.

8. The low-pulsation, low-impact, modular, hydraulic, piston-pump or motor cylinder of claim 3, wherein, The center line of the damping structure passes through the dividing circle of the flow distribution window (202).

9. The low-pulsation, low-impact, modular, hydraulic, piston-pump or motor-cylinder block of claim 1, wherein, Threaded hole one (105) is provided in the inner radial groove (103), and threaded hole two (106) is provided in the outer radial groove (104);Inner end face boss counterbore (205) is provided on the inner end face boss (203), and outer end face boss counterbore (206) is provided on the outer end face boss (204);Then, the modularization of flow distribution plane structure (2) is fixed in the annular groove of the plunger cylinder (1) by fasteners passing through threaded hole one (105) and inner end face boss counterbore (205), and threaded hole two (106) and outer end face boss counterbore (206).

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