An oil supplementing plunger pump assembly for a diaphragm compressor

Abstract

The utility model relates to an oil supplementing plunger pump assembly for diaphragm compressor, the oil supplementing plunger pump assembly for diaphragm compressor, including plunger pump body, be equipped with cam in the lubricating oil chamber of plunger pump body, be equipped with plunger cavity and the plunger oil cylinder of fixedly connecting in its below, form the oil supplementing chamber in the plunger oil cylinder, the middle part is equipped with the oil supplementing hole of communication with oil supplementing chamber, be equipped with first sealing between plunger oil cylinder and plunger pump body both sides at oil supplementing hole, be equipped with the oil supplementing channel of communication with oil supplementing hole on plunger pump body, the oil inlet of oil supplementing channel passes through first joint and connects oil inlet check valve, the lower end of plunger oil cylinder passes through second joint and connects oil outlet check valve, the body of standing includes the lower body of standing of inlaying in plunger oil cylinder and the upper body of standing of cooperation with plunger cavity, the top of upper body of standing is equipped with the gyro wheel of cooperation with cam, be equipped with second sealing between lower body of standing and oil supplementing chamber, be equipped with spring in the oil supplementing chamber below lower body of standing. The oil supplementing plunger pump assembly can accurately, reliably complete oil supplementing task.

Description

Technical Field

[0001] This utility model relates to the field of compressors, and in particular to an oil replenishing plunger pump assembly for a diaphragm compressor. Background Technology

[0002] A diaphragm compressor is a precision device that compresses gas by reciprocating a metal diaphragm driven by hydraulic oil. Its core principle lies in completely isolating the working chamber for compressing the gas from the hydraulic drive system, thus achieving absolutely pollution-free gas compression. During operation, due to unavoidable minor leaks or changes in oil volume caused by temperature variations, the amount of hydraulic oil on the diaphragm head side will slowly decrease, requiring periodic replenishment to maintain normal operating pressure and stroke.

[0003] Currently, existing oil replenishment devices have the following problems: ① Because the oil replenishment pipeline needs to withstand the high pressure of the compressor hydraulic system, the pressure of the hydraulic system may drop or the oil may flow back due to internal leakage of the pump when oil is first replenished, which will reduce the pressure of the diaphragm head and affect the operation of the compressor; ② Due to the poor sealing effect of the plunger pump, the leakage is too large, which will lead to insufficient oil replenishment; ③ Due to the unreasonable structure of the plunger (push-up body), the plunger may get stuck, thus causing the oil replenishment to fail. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides an oil replenishing plunger pump assembly for a diaphragm compressor, which has the advantages of high integration, precise oil replenishment, good sealing, and effective prevention of high-pressure oil back impact.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] An oil replenishing plunger pump assembly for a diaphragm compressor includes a plunger pump body. The plunger pump body has a lubricating oil chamber and an oil inlet channel and an oil outlet channel connected thereto. A cam connected to the crankshaft of the compressor is located within the lubricating oil chamber. A plunger cavity perpendicular to the cam's axis is located below the cam. A plunger cylinder is fixedly connected within the plunger cavity. An oil replenishing chamber is formed within the plunger cylinder. An oil replenishing hole communicating with the oil replenishing chamber is located in the middle of the plunger cylinder. First seals are provided on both sides of the oil replenishing hole between the plunger cylinder and the plunger pump body. The plunger pump body has a seal for oil replenishment... The oil replenishment channel is connected to the hole. The oil inlet of the oil replenishment channel is connected to the oil inlet check valve through the first connector. The lower end of the plunger cylinder is connected to the oil outlet check valve through the second connector. A retainer is provided between the upper end of the plunger cylinder and the cam. The retainer includes a lower retainer that extends into the plunger cylinder and an upper retainer that cooperates with the plunger cavity. The top of the upper retainer is provided with a roller that cooperates with the cam. A second seal is provided between the lower retainer and the oil replenishment cavity. A spring is provided in the oil replenishment cavity below the lower retainer so that it can cooperate with the retainer to block or expose the oil replenishment hole under the action of the cam.

[0007] Furthermore, the upper side of the upper body is provided with a limiting groove arranged along the sliding direction of the support body, and the plunger pump body is provided with a limiting pin whose end extends into the limiting groove.

[0008] Furthermore, the surface of the roller is spherical.

[0009] Furthermore, the first seal is an O-ring, and the second seal is a Glyd ring.

[0010] The advantages of this utility model using the above technical solution are:

[0011] 1. It has the advantage of high structural integration.

[0012] 2. The sealing effect during the oil replenishment process is excellent. Specifically, the first seal is a static seal with high reliability, which effectively ensures the seal between the plunger cylinder and the plunger pump body. Although the second seal is a dynamic seal, the upper lubrication chamber is equivalent to another oil seal, which effectively ensures the seal between the tappet and the plunger cylinder.

[0013] 3. The inlet check valve prevents the high-pressure oil from the compressor from flowing back into the oil replenishment chamber, and the outlet check valve prevents the oil in the oil replenishment chamber from flowing back. The combination of the two achieves a better oil replenishment effect.

[0014] 4. The thruster body moves more smoothly up and down without rotation, thanks to the cooperation between the lower thruster body and the plunger cylinder, the upper thruster body and the plunger cavity, and the limiting groove and the limiting pin. Introducing lubricating oil into the lubrication chamber reduces friction between the roller and the cam, and between the limiting pin and the limiting groove. The spherical design of the roller reduces friction and also decreases the lateral force on the thruster body caused by form and position tolerances, resulting in a longer roller life and reduced lateral friction between the thruster body and the cylinder.

[0015] The above structural configuration enables the oil replenishment plunger pump assembly of this application to perform accurate and reliable complete oil replenishment tasks. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of one embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the circumferential cross-sectional structure of the middle roller.

[0018] In the diagram, 1. Plunger pump body, 2. Lubricating oil chamber, 3. Oil inlet channel, 4. Oil outlet channel, 5. Crankshaft, 6. Cam, 7. Plunger cylinder, 8. Oil replenishment chamber, 9. Oil replenishment hole, 10. First seal, 11. Oil replenishment channel, 12. First connector, 13. Oil inlet check valve, 14. Second connector, 15. Oil outlet check valve, 16. Support body, 17. Roller, 18. Second seal, 19. Spring, 20. Limiting groove, 21. Limiting pin. Detailed Implementation

[0019] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0020] like Figure 1-2 As shown, in this embodiment, the diaphragm compressor oil replenishing plunger pump assembly includes a plunger pump body 1. The plunger pump body 1 has a lubricating oil chamber 2 and an oil inlet channel 3 and an oil outlet channel 4 connected thereto. The lubricating oil chamber 2 has a cam 6 connected to the crankshaft 5 of the compressor. Below the cam 6 is a plunger cavity perpendicular to its axis. A plunger cylinder 7 is fixedly connected to the plunger cavity. An oil replenishing chamber 8 is formed within the plunger cylinder 7. An oil replenishing hole 9 communicating with the oil replenishing chamber 8 is provided in the middle of the plunger cylinder 7. A first sealing element 10 is provided between the plunger cylinder 7 and the plunger pump body 1 on both sides of the oil replenishing hole 9. The plunger pump body 1 has a sealing element that communicates with the oil replenishing hole 9. The oil replenishment channel 11 is connected to the oil inlet of the oil replenishment channel 11. The oil inlet of the oil replenishment channel 11 is connected to the oil inlet check valve 13 through the first connector 12. The lower end of the plunger cylinder 7 is connected to the oil outlet check valve 15 through the second connector 14. A retainer body 16 is provided between the upper end of the plunger cylinder 7 and the cam 6. The retainer body 16 includes a lower retainer body that extends into the plunger cylinder 7 and an upper retainer body that cooperates with the plunger cavity. The top of the upper retainer body is provided with a roller 17 that cooperates with the cam. A second seal 18 is provided between the lower retainer body and the oil replenishment cavity 8. A spring 19 is provided in the oil replenishment cavity below the lower retainer body so that it can cooperate with the retainer body 16 to block or expose the oil replenishment hole 9 under the action of the cam 6.

[0021] Furthermore, the upper side of the upper body is provided with a limiting groove 20 arranged along the sliding direction of the support body, and the plunger pump body 1 is provided with a limiting pin 21 whose end extends into the limiting groove 20, which can prevent the support body 16 from rotating.

[0022] Furthermore, the surface of the roller 17 is spherical, which can reduce friction and reduce the lateral force on the support body 16 caused by form and position tolerances, thus extending the life of the roller and reducing the lateral friction between the support body and the cylinder. The roller is specifically mounted on the fixed shaft of the support body.

[0023] Furthermore, the first seal 10 may be an O-ring, and the second seal 18 may be a Glyd ring.

[0024] Work process:

[0025] When the diaphragm compressor starts to run, the crankshaft 5 of the compressor begins to rotate with the cam 6. At this time, under the action of the spring 19, the support body 16 presses the roller 17 onto the cam 6. As the cam 6 rotates, the support body 16 performs reciprocating motion.

[0026] As the crankshaft 5 rotates one revolution, the support body 16 completes one reciprocating motion, and the oil replenishing plunger pump assembly completes one oil suction and replenishment process. Specifically: when point A on the cam 6, closest to the crankshaft 5, contacts the roller 17, the support body 16 is at its uppermost position. At this time, the oil replenishment chamber 8 is connected to the oil replenishment channel 11 through the oil replenishment hole 9 of the plunger cylinder 7, and hydraulic oil enters the oil replenishment chamber 8 through the inlet check valve 13. When point A on the cam 6 rotates to its highest position, the support body 16 moves from the uppermost end to the lowermost end. At this time, the oil replenishment hole 9 on the plunger cylinder 7 is blocked by the moving support body 16, and the hydraulic oil in the oil replenishment chamber 8 is compressed, increasing the pressure in the oil replenishment chamber 8. The high-pressure oil enters the diaphragm compressor through the outlet check valve 15. This process is defined as the oil replenishment process. When point A of cam 6 rotates to the lowest point, the support body 16 moves from the lowest point to the highest point under the action of spring 19. At this time, the oil filling hole 9 on the plunger cylinder 7, which was blocked by the support body 16, is exposed and opened as the support body 16 moves upward. At this time, the volume of the oil filling chamber 8 increases, the hydraulic oil pressure in the oil filling chamber 8 decreases, and the hydraulic oil enters the oil filling chamber 8 through the oil inlet check valve 13. Specifically, it can be connected to a gear pump for oil injection. This process is defined as the oil suction process.

[0027] During the oil replenishment process, the pressure inside the oil replenishment chamber 8 increases, causing the outlet check valve 15 to open and replenish oil. Simultaneously, hydraulic oil leaking from the oil replenishment chamber 8 causes the pressure inside the oil replenishment channel 11 to increase, leading to the closure of the inlet check valve 13. The presence of the inlet check valve 13 ensures stable pressure inside the oil replenishment chamber 8 and sufficient oil replenishment. During the oil suction process, the pressure inside the oil replenishment chamber 8 decreases, while the pressure inside the compressor is higher, causing the outlet check valve 15 to close. The presence of the outlet check valve 15 ensures stable high-pressure oil pressure inside the compressor. Simultaneously, the inlet check valve 13 opens, allowing hydraulic oil to enter the oil replenishment chamber 8. The opening pressures of both check valves are carefully set to ensure sensitive response and tight sealing.

[0028] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0029] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A supplementary oil plunger pump assembly for a diaphragm compressor, characterized in that, The system includes a plunger pump body, which has a lubricating oil chamber and connected to it an oil inlet channel and an oil outlet channel. The lubricating oil chamber contains a cam connected to the crankshaft of the compressor. Below the cam is a plunger chamber perpendicular to its axis. A plunger cylinder is fixedly connected to the plunger chamber, and a replenishing oil chamber is formed within the plunger cylinder. A replenishing oil hole communicating with the replenishing oil chamber is located in the middle of the plunger cylinder. First seals are provided on both sides of the replenishing oil hole between the plunger cylinder and the plunger pump body. The plunger pump body has a replenishing oil channel connected to the replenishing oil hole. The oil inlet of the oil replenishment channel is connected to an oil inlet check valve via a first connector, and the lower end of the plunger cylinder is connected to an oil outlet check valve via a second connector. A retainer is provided between the upper end of the plunger cylinder and the cam. The retainer includes a lower retainer extending into the plunger cylinder and an upper retainer cooperating with the plunger cavity. The top of the upper retainer is provided with a roller that cooperates with the cam. A second seal is provided between the lower retainer and the oil replenishment cavity. A spring is provided in the oil replenishment cavity below the lower retainer so that it can cooperate with the retainer to block or expose the oil replenishment hole under the action of the cam.

2. The oil replenishing plunger pump assembly for a diaphragm compressor according to claim 1, characterized in that, The upper side of the upper body is provided with a limiting groove that is set along the sliding direction of the support body, and the plunger pump body is provided with a limiting pin that extends into the limiting groove.

3. The oil replenishing plunger pump assembly for a diaphragm compressor according to claim 1 or 2, characterized in that, The surface of the roller is spherical.

4. The oil replenishing plunger pump assembly for a diaphragm compressor according to claim 1, characterized in that, The first seal is an O-ring, and the second seal is a Glyd ring.

5. The oil replenishing plunger pump assembly for a diaphragm compressor according to claim 1, characterized in that, A locking nut is fixed to the lower end of the plunger cavity on the plunger pump body, and the plunger cylinder is threadedly fixed to the locking nut.

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