Plunger pump damping device

Abstract

The utility model relates to the technical field of rotary piston pumps, in particular to a plunger pump damping device. The plunger pump damping device comprises an inlet pipe and an outlet pipe, one end of the inlet pipe and one end of the outlet pipe are connected with a liquid inlet cavity and a liquid outlet cavity respectively, the liquid inlet cavity and the liquid outlet cavity are arranged in a closed cavity and provided with a liquid outlet through hole and a liquid inlet through hole respectively, and the other end of the inlet pipe and the other end of the outlet pipe penetrate out of the closed cavity respectively. And the liquid outlet through hole and the liquid inlet through hole are consistent with the inlet pipe and the outlet pipe in direction. Pulsating high-pressure fluid enters the liquid inlet cavity through the inlet pipe and then flows out along the direction consistent with that of the inlet pipe when flowing into the closed cavity from the liquid outlet through hole of the liquid inlet cavity, impact on the closed cavity is small, the closed cavity is filled with the high-pressure fluid and then enters the liquid outlet cavity from the liquid inlet through hole of the liquid outlet cavity, and finally the high-pressure fluid flows into the outlet pipe. Therefore, the problem that a plunger pump damping device is poor in damping effect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary piston pumps, in particular to a plunger pump shock absorbing device. Background Art

[0002] The plunger pump is a commonly used device in oilfield formation water injection stations and heating stations. It is a type of positive displacement pump that relies on the reciprocating piston in the pump cylinder to change the volume of the working chamber to achieve the purpose of sucking in or discharging the fluid. The plunger pump has a compact structure, small size, and light weight. It can work under high-speed rotation and pressure, but the suction and discharge processes of the plunger pump are carried out alternately, and the flow rate it generates is periodic, which will cause periodic pulsation in the hydraulic system. The plunger pumps used in hydraulic systems are generally reciprocating plunger pumps, which have very high outlet pressures and greater pulsations. They have a large impact on accessories such as the pump body, pipelines, flow meters, and pressure gauges, causing the pump to vibrate beyond the limit, affecting the service life of the equipment, and posing a major safety hazard.

[0003] In order to reduce the pressure pulsation of the pipeline liquid, an accumulator is currently installed on the outlet of the plunger pump. A capsule is provided inside the accumulator and filled with nitrogen. The nitrogen pressure is generally 60% of the working pressure. The pressure pulsation can be reduced by repeatedly compressing and relaxing the capsule. However, the capsule is prone to breakage and failure due to high-frequency repeated compression. The capsule needs to be replaced frequently and the filling nitrogen pressure needs to be checked regularly. The operation is inconvenient and the work efficiency is low.

[0004] In order to solve the above problems, a Chinese utility model patent with authorization announcement number CN201916179U and authorization announcement date August 3, 2011 discloses a plunger pump outlet buffer, which includes two hemispherical cavities, an inlet pipe, an outlet pipe, a V-shaped cylinder, and a baffle. A center hole is opened on the hemispherical cavity, one end of the inlet pipe and the outlet pipe are respectively welded to the trumpet-shaped V-shaped cylinder, the baffle blocks the trumpet ends of the inlet pipe and the outlet pipe, and four evenly distributed through holes are opened on the peripheral walls of the inlet and outlet V-shaped cylinders. One end of the inlet pipe welded with the baffle is opposite to the end of the outlet pipe welded with the baffle, and is placed in the two hemispherical cavities. The other ends of the inlet pipe and the outlet pipe are respectively inserted into the center hole of the hemispherical cavity for welding, and the two hemispherical bodies are buckled and welded into a sealed sphere. When in use, the plunger pump outlet buffer is welded to the outlet pipeline of the plunger pump. The liquid enters the cavity of the V-shaped cylinder and the baffle from the water inlet pipe, and is dispersed into the arc-shaped cavity of the buffer ball through the inlet through hole. The liquid flows along the tangent line in the arc-shaped cavity. The cavity of the buffer ball is filled with liquid. Under the action of pressure, the liquid enters the buffer cavity of the outlet pipe through the outlet through hole, and finally enters the outlet pipeline.

[0005] The plunger pump outlet buffer provided by the above utility model releases the liquid pulse pressure by changing the flow shape of the liquid, and alleviates the impact and vibration of the liquid on the plunger pump to a certain extent. However, the through hole opening on the peripheral wall of the water inlet V-shaped cylinder faces the inner wall of the sealing ball cavity. Since the flow rate and pulse pressure of the liquid at the outlet of the plunger pump are relatively large, the flow rate and pulse pressure of the liquid when entering the water inlet V-shaped cylinder are also relatively large, and the volume of the inner cavity of the V-shaped cylinder is relatively small, the liquid will be ejected from the through hole opening on the peripheral wall of the water inlet V-shaped cylinder, which has a relatively large impact on the inner wall of the sealing ball cavity. Long-term impact will cause damage to the sealing ball cavity; and the gap between the water inlet and outlet V-shaped cylinders is relatively large. The liquid enters the water inlet V-shaped cylinder from the inlet pipeline, and then flows out from the through hole on the peripheral wall thereof into the sealing ball. The liquid can only enter the water outlet V-shaped cylinder from the through hole on the peripheral wall of the water outlet V-shaped cylinder and flow out of the outlet pipeline when it fills the sealing ball. During the whole process, the two ends of the water inlet V-shaped cylinder and the water outlet V-shaped cylinder are in an unbalanced state, which will also cause vibration of the entire buffer, and the shock absorbing effect is relatively poor. Utility Model Content

[0006] The utility model aims to provide a plunger pump shock absorbing device to solve the problem of poor shock absorbing effect of the plunger pump shock absorbing device in the prior art.

[0007] In order to achieve the above purpose, the plunger pump shock absorbing device of the utility model adopts the following technical scheme:

[0008] A plunger pump shock absorbing device comprises an inlet pipe and an outlet pipe, wherein one end of the inlet pipe and the outlet pipe are respectively connected to a liquid inlet cavity and a liquid outlet cavity, wherein the liquid inlet cavity and the liquid outlet cavity are arranged in a closed cavity and are respectively provided with a liquid outlet through hole and a liquid inlet through hole, wherein the other ends of the inlet pipe and the outlet pipe respectively pass through the closed cavity, and the liquid outlet through hole and the liquid inlet through hole are in the same direction as the inlet pipe and the outlet pipe.

[0009] Beneficial effects: The plunger pump shock absorbing device of the utility model is an improved invention. Specifically, by setting the liquid outlet through holes and the liquid inlet through holes on the liquid inlet chamber and the liquid outlet chamber to be consistent with the directions of the inlet pipe and the outlet pipe, the pulsating high-pressure fluid enters the liquid inlet chamber through the inlet pipe, and then flows into the closed chamber from the liquid outlet through hole of the liquid inlet chamber, and will flow out in the same direction as the inlet pipe, with less impact on the closed chamber. After the closed chamber is filled with high-pressure fluid, it will enter the liquid outlet chamber from the liquid inlet through hole of the liquid outlet chamber, and finally flow into the outlet pipe. By repeatedly blocking the high-pressure fluid and changing its flow direction, the impact pulsation of the high-pressure fluid is reduced, thereby solving the problem of poor shock absorbing effect of the plunger pump shock absorbing device.

[0010] Furthermore, the opening directions of the liquid outlet through hole and the liquid inlet through hole are opposite to the liquid flow directions in the inlet pipe and the outlet pipe respectively.

[0011] Furthermore, the total flow area of ​​the liquid outlet through hole and the liquid inlet through hole is respectively larger than the cross-section of the inlet pipe and the outlet pipe.

[0012] Furthermore, there are no less than 2 liquid outlet through holes and no less than 2 liquid inlet through holes.

[0013] Furthermore, the liquid outlet through holes and the liquid inlet through holes are evenly arranged around the axes of the liquid inlet cavity and the liquid outlet cavity, respectively.

[0014] Furthermore, the liquid inlet cavity and the liquid outlet cavity respectively include an inlet baffle and an outlet baffle, and the inlet baffle and the outlet baffle are elastic baffles.

[0015] Furthermore, the liquid inlet cavity and the liquid outlet cavity are vertically connected to the inlet pipe and the outlet pipe respectively.

[0016] Furthermore, the liquid inlet cavity and the liquid outlet cavity are cylindrical box structures.

[0017] Furthermore, the closed cavity is formed by welding two hemispheres.

[0018] Furthermore, the liquid inlet cavity and the liquid outlet cavity are located at the center of the closed cavity and are arranged opposite to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a specific embodiment of the plunger pump shock absorbing device of the utility model;

[0020] Figure 2 yes Figure 1 Installation location diagram of the middle piston pump shock absorber.

[0021] In the figure: 1. inlet pipe; 101. liquid inlet chamber; 2. outlet pipe; 201. liquid outlet chamber; 3. closed chamber; 11. liquid outlet through hole; 21. liquid inlet through hole; 22. outlet partition; 23. inlet partition; 31. left hemisphere; 32. right hemisphere; 12. plunger pump. DETAILED DESCRIPTION

[0022] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0023] The plunger pump outlet buffer disclosed in the prior art releases the liquid pulse pressure by changing the flow shape of the liquid, which alleviates the impact and vibration of the liquid on the plunger pump to a certain extent. However, the through hole opening on the peripheral wall of the water inlet V-shaped cylinder faces the inner wall of the sealing ball cavity. Since the flow rate and pulse pressure of the liquid at the outlet of the plunger pump are relatively large, the flow rate and pulse pressure of the liquid when entering the water inlet V-shaped cylinder are also relatively large, and the volume of the inner cavity of the V-shaped cylinder is relatively small, the liquid will be ejected from the through hole opening on the peripheral wall of the water inlet V-shaped cylinder, which has a relatively large impact on the inner wall of the sealing ball cavity. Long-term impact will cause damage to the sealing ball cavity; and the gap between the water inlet and outlet V-shaped cylinders is relatively large. The liquid enters the water inlet V-shaped cylinder from the inlet pipeline, and then flows out from the through hole on the peripheral wall thereof into the sealing ball. The liquid can only enter the water outlet V-shaped cylinder from the through hole on the peripheral wall of the water outlet V-shaped cylinder and flow out of the outlet pipeline when it fills the sealing ball. During the whole process, the two ends of the water inlet V-shaped cylinder and the water outlet V-shaped cylinder are in an unbalanced state, which will also cause vibration of the entire buffer, and the shock absorbing effect is relatively poor. In view of the above problems, the utility model designs a plunger pump shock absorbing device. The core concept of the utility model is to set the liquid outlet holes and the liquid inlet holes on the liquid inlet chamber and the liquid outlet chamber to be consistent with the direction of the inlet pipe and the outlet pipe, so that when the pulsating high-pressure fluid flows into the closed cavity from the liquid outlet hole of the liquid inlet chamber, it will flow out in the same direction as the inlet pipe instead of being sprayed directly against the inner wall of the closed cavity, which can effectively reduce the impact of the pulsating high-pressure fluid on the closed cavity, thereby achieving a better shock absorbing effect.

[0024] Based on the above invention concept, Figure 1 As shown, a plunger pump shock absorbing device of the utility model comprises an inlet pipe 1 and an outlet pipe 2. One end of the inlet pipe 1 and the outlet pipe 2 are respectively connected to a liquid inlet cavity 101 and a liquid outlet cavity 201. The liquid inlet cavity 101 and the liquid outlet cavity 201 are arranged in a closed cavity 3 and are respectively provided with a liquid outlet through hole 11 and a liquid inlet through hole 21. The other ends of the inlet pipe 1 and the outlet pipe 2 respectively pass through the closed cavity 3. The liquid outlet through hole 11 and the liquid inlet through hole 21 are in the same direction as the inlet pipe 1 and the outlet pipe 2.

[0025] Among the above components, Figure 1 and Figure 2 In the embodiment shown, considering the large impact force of the pulsating high-pressure fluid, the closed cavity 3 is preferably a spherical cavity, which is welded by a left hemisphere 31 and a right hemisphere 32. Due to its high degree of symmetry, the spherical cavity can disperse the pressure more evenly when subjected to impact force, and can also withstand large impact force and pressure changes, and has good stability. In some other embodiments, the shape of the closed cavity 3 can also be cylindrical, conical, etc. Figure 1In the embodiment shown, the other ends of the inlet pipe 1 and the outlet pipe 2 pass through the sealed cavity 3 respectively. Considering the stability and sealing of the entire device, the inlet pipe 1, the outlet pipe 2 and the sealed cavity 3 are fixed by welding at their junctions. The inlet pipe 1 and the outlet pipe 2 are connected to the liquid inlet cavity 101 and the liquid outlet cavity 201 at one end respectively. The liquid inlet cavity 101 and the liquid outlet cavity 201 are vertically connected to the inlet pipe and the outlet pipe respectively, and the firmness is good. The liquid inlet chamber 101 and the liquid outlet chamber 201 are respectively surrounded by an inlet partition 23 and an outlet partition 22. The liquid inlet chamber 101 and the liquid outlet chamber 201 are both cylindrical box structures with larger volumes and better buffering effects on pulsating high-pressure fluids. The inlet partition 23 and the outlet partition 22 are elastic partitions that can absorb the pulsation of high-pressure fluids and reduce vibrations. In some other embodiments, the shapes of the liquid inlet chamber 101 and the liquid outlet chamber 201 may also be spherical, conical, or the like, and the materials of the inlet partition 23 and the outlet partition 22 may also be other materials with good shock-absorbing properties. The liquid inlet chamber 101 and the liquid outlet chamber 201 are connected to the inlet pipe 1 and the outlet pipe 2 to form a T shape, and are respectively located in the left hemisphere 31 and the right hemisphere 32, and are located in the center of the closed chamber 3. The liquid inlet chamber 101 and the liquid outlet chamber 201 are arranged relatively, and a small gap is left in the middle, so that the pulsating high-pressure fluid can flow through, which can reduce a certain impact and make the whole device in a balanced state. The liquid inlet chamber 101 and the liquid outlet chamber 201 are respectively provided with a liquid outlet through hole 11 and a liquid inlet through hole 21. The liquid outlet through hole 11 and the liquid inlet through hole 21 are in the same direction as the inlet pipe 1 and the outlet pipe 2. When the pulsating high-pressure fluid flows into the liquid inlet chamber 101 and then flows out of the liquid outlet through hole 11, the pulsating high-pressure fluid will flow out in the same direction as the inlet pipe 1, and the impact on the inner wall of the closed chamber 3 is small, achieving a better shock absorption effect. The opening directions of the liquid outlet through hole 11 and the liquid inlet through hole 12 are opposite to the liquid flow directions in the inlet pipe 1 and the outlet pipe 2, respectively, so that the pulsating pressure of the high-pressure fluid can be better released in the closed cavity 3. In some other embodiments, the opening direction can also be the same as the liquid flow direction in the inlet pipe 1 and the outlet pipe 2. Considering the stability of the entire device, there are two liquid outlet through holes 11 and two liquid inlet through holes 21, which are evenly arranged around the axis of the liquid inlet cavity 101 and the liquid outlet cavity 201, respectively. In some other embodiments, the number of the liquid outlet through holes 11 and the liquid inlet through holes 21 can also be set to 4. The total flow area of ​​the liquid outlet through holes 11 and the liquid inlet through holes 21 is larger than the cross-section of the inlet pipe 1 and the outlet pipe 2, respectively, which can reduce the vibration of the entire device.

[0026] When using this shock absorber, Figure 2As shown, the entire device can be installed on the outlet pipeline of the plunger pump 12. When the plunger pump 12 is working, the high-pressure liquid generated by the plunger is output in a pulsating manner in the outlet pipeline through the inlet pipe 1 into the liquid inlet chamber 101, and after being blocked by the inlet partition 23, it flows out from the liquid outlet through hole 11 into the sealed chamber 3, and then pushes the high-pressure fluid in the chamber into the liquid outlet chamber 201 from the liquid inlet through hole 21, and after being blocked again by the outlet partition 22, it enters the outlet pipe 2. By repeatedly blocking and releasing the pulsating pressure, the impact pulsation of the liquid flow is reduced to achieve a better shock absorption effect.

Claims

1. A plunger pump damping device, comprising an inlet pipe and an outlet pipe, wherein one end of the inlet pipe and the outlet pipe are respectively connected to a liquid inlet cavity and a liquid outlet cavity, wherein the liquid inlet cavity and the liquid outlet cavity are arranged in a closed cavity and are respectively provided with a liquid outlet through hole and a liquid inlet through hole, wherein the other ends of the inlet pipe and the outlet pipe respectively pass through the closed cavity, characterized in that: The directions of the liquid outlet through hole and the liquid inlet through hole are consistent with those of the inlet pipe and the outlet pipe.

2. The plunger pump shock absorbing device according to claim 1, characterized in that: The opening directions of the liquid outlet through hole and the liquid inlet through hole are respectively opposite to the liquid flow directions in the inlet pipe and the outlet pipe.

3. The plunger pump damping device according to claim 1 or 2, characterized in that: The total flow area of ​​the liquid outlet through hole and the liquid inlet through hole is respectively larger than the cross-section of the inlet pipe and the outlet pipe.

4. The plunger pump damping device according to claim 3, characterized in that: The number of the liquid outlet through holes and the liquid inlet through holes is no less than 2 respectively.

5. The plunger pump damping device according to claim 4, characterized in that: The liquid outlet through holes and the liquid inlet through holes are evenly arranged around the axes of the liquid inlet cavity and the liquid outlet cavity respectively.

6. The plunger pump damping device according to claim 1, characterized in that: The liquid inlet cavity and the liquid outlet cavity respectively include an inlet baffle and an outlet baffle, and the inlet baffle and the outlet baffle are elastic baffles.

7. The plunger pump damping device according to claim 6, characterized in that: The liquid inlet cavity and the liquid outlet cavity are respectively vertically connected to the inlet pipe and the outlet pipe.

8. The plunger pump damping device according to claim 7, characterized in that: The liquid inlet cavity and the liquid outlet cavity are cylindrical box structures.

9. The plunger pump damping device according to claim 1, characterized in that: The closed cavity is formed by welding two hemispheres.

10. The plunger pump damping device according to claim 8 or 9, characterized in that: The liquid inlet cavity and the liquid outlet cavity are located at the center of the closed cavity and are arranged opposite to each other.

Images