Improved liquid flow stabilizing and buffering structure

Abstract

The invention provides an improved liquid flow stabilizing and buffering structure, and belongs to the technical field of hydraulic pumps. The control valve and the elastic reset valve are arranged at the two ends of the swing part respectively and connected through the connecting ball heads, the damping piece is arranged in the first oil hole communicated with the control valve, the oil inlet resistance of control oil can be increased, meanwhile, the reset spring with higher rigidity is used in the elastic reset valve to support the reverse valve element, and the oil inlet resistance of the control oil is improved. The stability of the control valve and the elastic reset valve at the two ends of the swing is higher, so that the stable state of the swing is better maintained, the influence of flow pulse on the operation of the plunger pump is weakened, the high-pressure shaking problem of the plunger pump is avoided, the noise is weakened, and the plunger pump better adapts to the medium-high-pressure use environment; the swing adjustment is realized by the control valve on one side and the reset spring of the elastic reset valve on the other side, and only an oil duct needs to be configured for the control valve, so that the arrangement of the oil duct is reduced, the control is more convenient, the production and the processing are convenient, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic pumps, and in particular to an improved liquid flow stabilizing buffer structure. Background Art

[0002] Hydraulic piston pumps can convert kinetic energy into liquid flow to achieve liquid suction and discharge. They are usually used as driving structures for liquids in pipeline systems. Improving the performance of piston pumps is directly related to the operating status of the pipeline system. Therefore, improving the performance of piston pumps has become a focus of industry research.

[0003] At present, the existing plunger pumps on the market include quantitative plunger pumps and variable plunger pumps. The quantitative plunger pump is fixed by swinging in the inner cavity of the housing, so that the moving stroke of the plunger is fixed and flow regulation cannot be achieved. It is only applicable to some simple usage scenarios and has large usage restrictions. The variable plunger pump is installed in the inner cavity of the housing with a swinging movement. At the same time, the swing is connected by an adjustment mechanism to achieve the adjustment of the swinging deflection angle, thereby achieving the adjustment of the moving stroke of the plunger to meet the flow regulation requirements. For example, a variable mechanism of a plunger pump disclosed in patent CN101876303B is provided with contact parts on both sides of the swash plate (the above-mentioned swing) and abuts against the housing to achieve the deflection of the swash plate. Both ends of the swash plate are movably connected with a sliding shoe, one end of the cylinder is fixedly connected to the housing, one end of the plunger is slidably arranged in the cylinder, and the other end of the plunger is connected to the sliding shoe. The expansion and contraction of the plunger is controlled by the pressure change of the oil in the cylinder, thereby pushing the swash plate to deflect, thereby achieving the flow regulation of the plunger pump, which should be used in more environments. Although the above-mentioned existing plunger pumps can meet the variable adjustment requirements, their variable mechanism has a cylinder plunger structure at both ends, which requires oil support. The oil channel is relatively complex, inconvenient to control, difficult to manufacture, and costly. In addition, when used in medium and high pressure environments, when the high-pressure pressure oil enters and exits the cylinder, the large flow pulse will cause the swash plate to vibrate, thereby affecting the normal operation of the pump body. That is, the existing variable plunger pump has a high-pressure jitter problem. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide an improved liquid flow stabilization buffer structure, so that a control valve and an elastic return valve are respectively arranged at the two ends of the swing, and a damping member is arranged at the control valve to enhance the oil inlet resistance of the control oil, and at the same time increase the stiffness of the return spring of the elastic return valve, so that the support stability of the control valve and the elastic return valve is higher, thereby improving the ability of the swing to maintain a stable state, effectively reducing the influence of flow pulsation on the operation of the plunger pump, thereby reducing the high-pressure jitter problem of the variable plunger pump, and better adapting to the medium and high pressure use environment, and the adjustment structure is a control valve at one end and a return spring at the other end, which reduces the oil channel layout, makes control more convenient, and makes production and processing more convenient, and has a lower manufacturing cost.

[0005] The specific technical solutions are as follows: An improved liquid flow stabilizing buffer structure, arranged on the rear cover and acting on the swing, has the following characteristics: it comprises a control valve, an elastic reset valve and a damping member; Furthermore, the control valve comprises a control valve sleeve and a control valve core, one end of the control valve core is fixedly mounted on the rear cover, a flow channel penetrating both ends of the control valve core is provided in the center and along the axial direction thereof and is communicated with a first oil hole on one end of the rear cover, the control valve sleeve is arranged in a barrel shape and sleeved outside the other end of the control valve core, and a connecting ball head is provided between the end of the control valve sleeve away from the rear cover and the swinging end; The elastic reset valve includes a reverse valve sleeve, a reverse valve core and a reset spring. The reverse valve sleeve is arranged in a cylindrical shape and one end is connected to the second oil hole on the other end of the rear cover. At the same time, the reverse valve core is a T-shaped structure, and the small end of the reverse valve core is inserted into the reverse valve sleeve and slidably arranged. A connecting ball head is arranged between the large end of the reverse valve core and the other end of the swing. The reset spring sleeve is arranged outside the reverse valve sleeve and the reverse valve core, and the two ends of the reset spring are respectively against the reverse valve sleeve and the reverse valve core. The damping member is arranged in the first oil hole.

[0006] The above-mentioned improved liquid flow stabilizing buffer structure, wherein the first oil hole on the rear cover is used to install the port at one end of the control valve and the second oil hole is used to install the port at one end of the elastic reset valve, both of which are concave step holes, and the ends of the control valve and the elastic reset valve are extended into the corresponding step holes.

[0007] In the above-mentioned improved liquid flow stabilizing buffer structure, when the swing is in the maximum swing angle state, the control valve sleeve is sleeved on one end of the control valve core and moves into the corresponding step hole.

[0008] In the above-mentioned improved liquid flow stabilizing buffer structure, the flow channel of the control valve core is arranged in a flared manner at the port away from the end connected to the first oil hole, and the flared port is a hexagonal hole.

[0009] In the above-mentioned improved liquid flow stabilizing buffer structure, the ratio of the diameter of the flow channel of the control valve core to the diameter of the control valve core is in the range of 1:6 to 1:8.

[0010] The above-mentioned improved liquid flow stabilizing buffer structure, wherein one end of the central hole of the reverse valve sleeve is a sliding hole, the small head end of the reverse valve core is slidably arranged in the sliding hole, and the ratio of the length of the sliding hole to the total length of the reverse valve sleeve is in the range of 1:3 to 1:2.

[0011] The above-mentioned improved liquid flow stabilizing buffer structure also includes a spring seat, which is sleeved outside the small end of the reverse valve core and one end of the spring seat abuts against the large end of the reverse valve core, and the other end of the spring seat abuts against one end of the return spring.

[0012] In the above-mentioned improved liquid flow stabilizing buffer structure, a protruding outer edge is arranged on the outer side of the spring seat, the return spring abuts against the outer edge, and a plurality of spring seats are arranged, and the lengths of the plurality of spring seats are different.

[0013] The positive effects of the above technical solution are: The above-mentioned improved liquid flow stabilization buffer structure is achieved by arranging a control valve and an elastic return valve on the rear cover, and the control valve and the elastic return valve are also respectively connected to the two ends of the swing through connecting ball heads, and a damping member is arranged in the first oil hole connected to the control valve, thereby increasing the control oil inlet resistance. At the same time, an elastic return valve is adopted and the stiffness of the return spring of the elastic return valve is increased, so that the support stability of the control valve and the elastic return valve is higher, and the swing state can be better stabilized, effectively reducing the influence of flow pulsation on the operation of the plunger pump, improving the high-pressure jitter problem of the variable plunger pump, and adapting to the medium and high pressure use environment. In addition, the swing state adjustment is achieved through the control valves and return springs at both ends, and there is no need to arrange oil channel control structures at both ends, thereby reducing the oil channel layout, facilitating control, facilitating production and processing, and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an embodiment of an improved liquid flow stabilizing buffer structure of the present invention; Figure 2 A structural diagram of a control valve core according to a preferred embodiment of the present invention; Figure 3 A structural diagram of a control valve sleeve of a preferred embodiment of the present invention; Figure 4 A structural diagram of a back cover of a preferred embodiment of the present invention; Figure 5 A structural diagram of a reverse valve sleeve according to a preferred embodiment of the present invention; Figure 6 This is a structural diagram of a spring seat according to a preferred embodiment of the present invention.

[0015] In the accompanying drawings: 1. rear cover; 11. first oil hole; 12. second oil hole; 111. step hole; 2. control valve; 21. control valve sleeve; 22. control valve core; 221. flow channel; 222. hexagon socket hole; 3. elastic reset valve; 31. reverse valve sleeve; 32. reverse valve core; 33. reset spring; 34. spring seat; 311. sliding hole; 341. outer edge; 4. damping member. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the attached Figure 1 To Attachment Figure 6 The technical solution provided by the present invention is described in detail, but the following content is not intended to limit the present invention.

[0017] Figure 1 FIG. 1 is a structural diagram of an embodiment of an improved liquid flow stabilizing buffer structure of the present invention. Figure 1 As shown, the improved liquid flow stabilizing buffer structure provided in this embodiment is arranged on the rear cover and acts on the swing, that is, the swing angle can be adjusted to meet the purpose of adjusting the moving stroke of the plunger, thereby adjusting the flow rate. In addition, the improved liquid flow stabilizing buffer structure provided in this embodiment also includes: a control valve 2, an elastic reset valve 3 and a damping member 4.

[0018] Figure 2 A structural diagram of a control valve core according to a preferred embodiment of the present invention; Figure 3 FIG. 1 is a structural diagram of a control valve sleeve of a preferred embodiment of the present invention. Figure 1 , Figure 2 as well as Figure 3As shown, the control valve 2 further includes a control valve sleeve 21 and a control valve core 22. When installing, one end of the control valve core 22 is fixedly installed on the rear cover 1. At this time, a flow channel 221 running through both ends is opened in the center of the control valve core 22 and along its axial direction, which provides conditions for the subsequent flow of pressure oil at both ends of the control valve core 22. In addition, the flow channel 221 of the control valve core 22 is connected with the first oil hole 11 on one end of the rear cover 1, that is, the pressure oil entering and exiting through the first oil hole 11 can smoothly flow in and out of the control valve core 22, thereby meeting the subsequent use requirements of pushing the control valve sleeve 21 to move relative to the control valve core 22. In addition, the control valve sleeve 21 is arranged in a barrel shape. When installing, one end of the barrel mouth of the control valve sleeve 21 is sleeved outside the other end of the control valve core 22, and the control valve sleeve 21 can slide relative to the control valve core 22 along its axial direction, which provides conditions for the subsequent movement of the control valve sleeve 21 to push the swing and deflection. In addition, a connecting ball head is provided between the end of the control valve sleeve 21 away from the rear cover 1 and the swinging end, so as to realize a universal connection between the swinging end and the control valve sleeve 21, better adapt to the deflection of the swing, and better adaptability. When in use, the pressure oil enters the flow channel 221 of the control valve core 22 from the first oil hole 11 and pushes the control valve sleeve 21 to slide on the control valve core 22, thereby pushing the swing to deflect, thereby realizing the adjustment of the swing deflection angle and meeting the flow regulation requirements of the plunger pump.

[0019] Specifically, the elastic reset valve 3 includes a reverse valve sleeve 31, a reverse valve core 32 and a reset spring 33. At this time, the reverse valve sleeve 31 is arranged in a cylindrical shape so that the reverse valve sleeve 31 has a central hole running through it. In addition, a second oil hole 12 is provided on the other end of the rear cover 1, and one end of the directional valve sleeve is fixedly mounted on the rear cover 1 and communicated with the second oil hole 12 on the other end of the rear cover 1. At the same time, the reverse valve core 32 is a T-shaped structure, that is, one end of the reverse valve core 32 is a large end, and the other end is a small end, and the small end is a rod-shaped structure. During installation, the small end of the reverse valve core 32 is inserted into the reverse valve sleeve 31 and arranged in a sliding manner, so that the reverse valve core 32 can slide relatively on the reverse valve sleeve 31, providing a guide for the subsequent expansion and contraction of the reverse valve core 32 in the reverse valve sleeve 31. In addition, a connecting ball head is provided between the large end of the reverse valve core 32 and the other end of the swing, so that the expansion and contraction of the reverse valve core 32 can push the other end of the swing to move, thereby realizing the swing deflection, that is, the reverse valve core 32 and the control valve sleeve 21 act on the two ends of the swing respectively, realizing the support and limit of the swing. In addition, the reset spring 33 is sleeved outside the reverse valve sleeve 31 and the reverse valve core 32, and the two ends are respectively against the reverse valve sleeve 31 and the reverse valve core 32, that is, the reverse valve core 32 is supported on the reverse valve sleeve 31 by the reset spring 33, so that when the control valve 2 pushes the swing to deflect toward the elastic reset valve 3, the reverse valve core 32 moves toward the inside of the reverse valve sleeve 31, at this time, the reset spring 33 is compressed and stores energy, and the swing angle gradually decreases until it reaches a flat state, at which time the flow of the plunger pump is zero. When the flow of the plunger pump needs to be increased, the pressure oil of the control valve 2 is discharged, the reset spring 33 releases the stored energy and restores the length, and pushes the reverse valve core 32 to move toward the outside of the reverse valve sleeve 31, thereby pushing the swing to one side of the control valve 2, so that the control valve sleeve 21 retracts toward the side of the control valve core 22 until the swing angle reaches the maximum swing angle. At this time, the flow of the plunger pump is the largest, meeting the flow demand. In addition, in this process, only the control valve 2 needs to be regulated, and the elastic reset valve 3 can follow, thereby reducing the layout of the oil channel, the structure is simple, the control is convenient, and it is conducive to processing and manufacturing, reducing the manufacturing cost. It is worth pointing out that since the reverse valve sleeve 31 is installed on the second oil hole 12 of the rear cover 1, the elastic reset valve 3 also has the oil circuit control conditions, and can realize the same control method as in the prior art, so as to realize the auxiliary control of the elastic reset valve 3, so that when the swing is supported later, the stability is better, thereby improving the effect of maintaining the stability of the swing state, reducing the influence of the flow pulse on the operation of the plunger pump, and improving the performance of the plunger pump in a medium and high pressure environment.

[0020] More specifically, a damping member 4 is also provided in the first oil hole 11. The damping member 4 increases the oil inlet resistance, so that the control valve 2 is less affected by the flow pulse, further improving the ability to maintain a stable swing state, and further improving the performance of the plunger pump in medium and high pressure environments.

[0021] Figure 4 FIG. 1 is a structural diagram of a back cover of a preferred embodiment of the present invention. Figure 1 and Figure 4 As shown, the first oil hole 11 on the rear cover 1 is used to install the port at one end of the control valve 2 and the second oil hole 12 is used to install the port at one end of the elastic reset valve 3, which are both set as concave step holes 111, and the hole openings are sunken through the step holes 111. During installation, the ends of the control valve 2 and the elastic reset valve 3 are both extended into the corresponding step holes 111, so that the installation space of the control valve 2 and the elastic reset valve 3 can be increased while the original installation space remains unchanged, thereby lengthening the control range of the control valve core 22 and the control valve sleeve 21 and the reverse valve sleeve 31 and the reverse valve core 32, so that the control accuracy is higher, and the influence of flow pulses can also be weakened to avoid the problem of high-pressure jitter of the plunger pump.

[0022] More specifically, when the control valve sleeve 21 of the control valve 2 retracts, the swing angle of the swing gradually increases, and when the swing is at the maximum swing angle state, one end of the control valve sleeve 21 sleeved on the control valve core 22 moves to the corresponding step hole 111, that is, when the control valve sleeve 21 retracts to the maximum stroke, the flow rate of the plunger pump is the largest, and one end of the control valve sleeve 21 rests on the step of the step hole 111, which has higher stability, further prevents the high-pressure jitter problem, and improves the performance of the plunger pump.

[0023] More specifically, the flow channel 221 of the control valve core 22 is arranged in a flared manner at the port located away from the end connected to the first oil hole 11. At the same time, the flared port of the flow channel 221 of the control valve core 22 is set as a hexagonal hole 222, so that when the control valve core 22 is installed in the first oil hole 11, a threaded connection between the first oil hole 11 and the control valve core 22 can be achieved. At the same time, the hexagonal hole 222 can be used in conjunction with a hexagonal wrench, which makes disassembly and assembly more convenient.

[0024] More specifically, the ratio of the diameter of the flow channel 221 of the control valve core 22 to the diameter of the control valve core 22 is set in the range of 1:6 to 1:8. Preferably, the ratio of the diameter of the flow channel 221 of the control valve core 22 to the diameter of the control valve core 22 itself is 1:7, so that the flow channel 221 of the control valve core 22 is a slender small hole, which can increase the damping effect. When used in conjunction with the damping element 4 in the first oil hole 11, it can further weaken the influence of flow pulses and improve the problem of preventing high-pressure jitter.

[0025] Figure 5 FIG. 1 is a structural diagram of a reverse valve sleeve of a preferred embodiment of the present invention. Figure 1 and Figure 5As shown, one end of the center hole of the reverse valve sleeve 31 is a sliding hole 311, and at the same time, the small end of the reverse valve core 32 is slidably set in the sliding hole 311, that is, the reverse valve core 32 and the reverse valve sleeve 31 are matched through the sliding hole 311, so that the small end of the reverse valve core 32 can be extended and retracted in the sliding hole 311 of the reverse valve sleeve 31. In addition, the ratio of the length of the sliding hole 311 to the total length of the reverse valve sleeve 31 is in the range of 1:3 to 1:2. Preferably, the ratio of the length of the sliding hole 311 to the total length of the reverse valve sleeve 31 is 2:5, so that the sliding hole 311 can not only meet the sliding requirements of the small end of the reverse valve core 32, but also prevent the small end of the reverse valve core 32 from excessively extending into the sliding hole 311, thereby avoiding the problem that the reverse valve core 32 is stuck due to a slight tilt, providing a fault tolerance margin for the sliding of the reverse valve core 32 in the reverse sliding sleeve, ensuring the effectiveness of the action of the elastic reset valve 3, and having a more flexible structure to adapt to more complex working conditions. In addition, the length of the reverse valve sleeve 31 itself can be shortened, thus saving costs and facilitating processing and manufacturing.

[0026] Figure 6 FIG. 1 is a structural diagram of a spring seat in a preferred embodiment of the present invention. Figure 1 and Figure 6 As shown, the elastic reset valve 3 also includes a spring seat 34. At this time, the spring seat 34 is sleeved outside the small end of the reverse valve core 32 and one end is against the large end of the reverse valve core 32. The spring seat 34 adds a support base on the reverse valve core 32, thereby shortening the length of the small end of the reverse valve core 32, and the other end of the spring seat 34 is against one end of the reset spring 33, so that the reset spring 33 can be made of a material with higher rigidity and coarser, thereby improving the stability of the reset spring 33, further reducing the influence of flow pulses, and improving the ability of the plunger pump to resist high-pressure jitter, and the structural design is more reasonable. In addition, through the spring seat 34, when the reset spring 33 with higher rigidity and coarser is designed and the original reverse valve core 32 is still used, the original reverse valve core 32 and the newly designed reset spring 33 can still be matched as an installation transfer structure between the original reverse valve core 32 and the newly designed reset spring 33, without the need to redesign the reset spring 33, thereby reducing the manufacturing cost.

[0027] More specifically, a protruding outer edge 341 is provided on the outer side of the spring seat 34, and one end of the return spring 33 abuts against the outer edge 341 of the spring seat 34, that is, the outer edge 341 on the spring seat 34 provides a base for the return spring 33 to abut against. In addition, there are a plurality of spring seats 34, and the lengths of the plurality of spring seats 34 are different, so that spring seats 34 of appropriate length can be selected according to return springs 33 of different specifications and models for adaptation, which also increases the flexibility of the structure, improves adaptability, and makes the structural design more reasonable.

[0028] The improved liquid flow stabilization buffer structure provided in the present embodiment includes a control valve 2 and an elastic return valve 3 arranged between the rear cover 1 and the swing; by respectively arranging the control valve 2 and the elastic return valve 3 at the two ends of the swing and connecting them respectively through connecting ball heads, and a damping member 4 is arranged in the first oil hole 11 connected to the control valve 2, the oil inlet resistance of the control oil can be increased. At the same time, a return spring 33 with greater stiffness is used in the elastic return valve 3 to support the reverse valve core 32, so that the control valve 2 and the elastic return valve 3 at both ends of the swing are more stable, thereby better maintaining the stable state of the swing, reducing the influence of the flow pulse on the operation of the plunger pump, avoiding the high-pressure jitter problem of the plunger pump, reducing noise, and better adapting to the medium and high pressure use environment. In addition, the adjustment of the swing is achieved by relying on the control valve 2 on one side and the return spring 33 of the elastic return valve 3 on the other side. Only the control valve 2 needs to be configured with an oil channel, thereby reducing the layout of the oil channel, making the control more convenient, facilitating production and processing, and reducing the manufacturing cost.

[0029] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An improved liquid flow stabilizing buffer structure, arranged on the rear cover and acting on the swing, characterized in that: include: Control valves, elastic return valves and damping elements; Furthermore, the control valve comprises a control valve sleeve and a control valve core, one end of the control valve core is fixedly mounted on the rear cover, a flow channel penetrating both ends of the control valve core is provided in the center and along its axial direction and is communicated with a first oil hole on one end of the rear cover, the control valve sleeve is arranged in a barrel shape and sleeved outside the other end of the control valve core, and a connecting ball head is provided between the end of the control valve sleeve away from the rear cover and the swinging end; The elastic reset valve comprises a reverse valve sleeve, a reverse valve core and a reset spring. The reverse valve sleeve is arranged in a cylindrical shape and one end of the reverse valve core is communicated with the second oil hole on the other end of the rear cover. At the same time, the reverse valve core is a T-shaped structure, and the small end of the reverse valve core is inserted into the reverse valve sleeve and slidably arranged. A connecting ball head is arranged between the large end of the reverse valve core and the other end of the swing. The reset spring sleeve is arranged outside the reverse valve sleeve and the reverse valve core, and the two ends of the reset spring are respectively against the reverse valve sleeve and the reverse valve core. The damping member is disposed in the first oil hole.

2. The improved liquid flow stabilizing buffer structure according to claim 1, characterized in that: The first oil hole on the rear cover is used to install the port at one end of the control valve, and the second oil hole is used to install the port at one end of the elastic reset valve. Both are concave step holes, and the ends of the control valve and the elastic reset valve extend into the corresponding step holes.

3. The improved liquid flow stabilizing buffer structure according to claim 2, characterized in that: When the swing is in the maximum swing angle state, the control valve sleeve is sleeved on one end of the control valve core and moves into the corresponding step hole.

4. The improved liquid flow stabilizing buffer structure according to claim 1, characterized in that: The flow channel of the control valve core is arranged in a flared manner at a port away from the end connected to the first oil hole, and the flared port is a hexagonal hole.

5. The improved liquid flow stabilizing buffer structure according to claim 1, characterized in that: The ratio of the diameter of the flow channel of the control valve core to the diameter of the control valve core is in the range of 1:6 to 1:

8.

6. The improved liquid flow stabilizing buffer structure according to claim 1, characterized in that: One end of the center hole of the reverse valve sleeve is a sliding hole, and the small end of the reverse valve core is slidably arranged in the sliding hole, and the ratio of the length of the sliding hole to the total length of the reverse valve sleeve is in the range of 1:3 to 1:

2.

7. The improved liquid flow stabilizing buffer structure according to claim 1, characterized in that: It also includes a spring seat, which is sleeved outside the small end of the reverse valve core and has one end abutting against the large end of the reverse valve core, and the other end of the spring seat abuts against one end of the return spring.

8. The improved liquid flow stabilizing buffer structure according to claim 7, characterized in that: The outer side of the spring seat is provided with a protruding outer edge, the return spring abuts against the outer edge, and a plurality of spring seats are provided, and the lengths of the plurality of spring seats are different.

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