Plunger pump structure

Abstract

The utility model provides a plunger pump structure which comprises a pump body and a plunger rod sliding in the pump body, the pump body is provided with an oil inlet hole and an oil outlet hole, the pump body is internally provided with a movable cavity for the plunger rod to move, the movable cavity is internally provided with a check valve structure matched with the plunger rod to pump oil, and the check valve structure is provided with an oil inlet hole and an oil outlet hole. A metal sleeve is arranged between the plunger rod and the movable cavity, the metal sleeve is connected to the end, close to the plunger rod, of the pump body in a sealed mode, a passing cavity for the plunger rod to pass through is formed in the metal sleeve, and an oil inlet channel is further arranged between the oil inlet hole of the pump body and the passing cavity of the metal sleeve. The metal sleeve is matched with the plunger rod, so that the wear resistance is good, the replacement frequency is low, and the replacement is convenient.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and in particular to a piston pump structure. Background Technology

[0002] In existing plunger pumps, the piston is directly mounted within the pump body, which has a movable chamber for piston movement. The pump body is typically made of plastic, making it prone to wear. Repeated friction between the piston and the pump body causes wear on the inner wall of the pump body, affecting the service life of the plunger pump. Furthermore, wear creates gaps between the piston and the pump body, causing the piston to wobble inside the pump body and generate noise. Frequent replacement of the plunger pump body increases costs, and disassembly and reassembly waste time and effort. Utility Model Content

[0003] To address the problems of the prior art, this utility model provides a plunger pump structure in which a wear-resistant metal sleeve is provided between the pump body and the plunger rod, resulting in low replacement frequency and convenient replacement.

[0004] The technical solution adopted is as follows:

[0005] A plunger pump structure includes a pump body and a plunger rod sliding within the pump body. The pump body has an oil inlet and an oil outlet. The pump body has a movable cavity for the plunger rod to move. The movable cavity has a check valve structure that cooperates with the plunger rod to pump oil. A metal sleeve is provided between the plunger rod and the movable cavity. The metal sleeve is sealed to one end of the pump body near the plunger rod. The metal sleeve has a passage cavity for the plunger rod to pass through. An oil inlet channel is also provided between the oil inlet of the pump body and the passage cavity of the metal sleeve.

[0006] Furthermore, the check valve structure includes a valve ball that slides within the movable cavity in cooperation with the plunger rod, and a spring that drives the valve ball to fill the passage cavity.

[0007] Furthermore, one end of the spring is located in the movable cavity away from the plunger rod, and the other end is connected to the valve ball.

[0008] Furthermore, the metal sleeve and the movable cavity can be connected by threads.

[0009] Furthermore, one end of the plunger rod is located inside the pump body, and the other end is provided with a pull ring.

[0010] Furthermore, the oil inlet is connected to the oil tank, and the oil outlet is connected to the lubrication oil circuit.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a plunger pump structure with a metal sleeve between the pump body and the plunger rod. The metal sleeve is sealed to one end of the pump body, which can enhance the sealing effect. The plunger rod moves within the metal sleeve and slides in contact with it. Because the metal sleeve has better wear resistance than the plastic pump body, the sliding friction with the metal sleeve makes it less prone to gaps and shaking. The metal sleeve is less prone to wear and requires less frequent replacement. Compared with replacing the pump body, replacing the metal sleeve is more convenient and simple. Preferably, the metal sleeve and the pump body can be connected by threads for further convenience of replacement. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the tie rod when it is not pulled out.

[0014] Figure 3 This is a cross-sectional view of the tie rod when it is pulled outward;

[0015] Figure 4 This is a cross-sectional view of the tie rod when it is compressed inward.

[0016] The components include: pump body 1, plunger rod 2, movable chamber 3, metal sleeve 4, through chamber 5, pull ring 6, check valve structure 7, valve ball 701, spring 702, oil inlet channel 8, oil inlet hole 9, oil outlet hole 10. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments.

[0018] refer to Figure 1-4 A plunger pump structure includes a pump body 1 and a plunger rod 2 sliding within the pump body. The pump body has an oil inlet hole 9 and an oil outlet hole 10. The pump body 1 has a movable cavity 3 for the plunger rod 2 to move. The movable cavity 3 has a check valve structure 7 that cooperates with the plunger rod 2 to pump oil. A metal sleeve 4 is provided between the plunger rod 2 and the movable cavity 3. The metal sleeve 4 is sealed and connected to one end of the pump body 1 near the plunger rod 2. The metal sleeve 4 has a passage cavity 5 for the plunger rod 2 to pass through. An oil inlet channel 8 is also provided between the oil inlet hole 9 of the pump body 1 and the passage cavity 5 of the metal sleeve 4.

[0019] A metal sleeve 4 is provided between the pump body 1 and the plunger rod 2 to enhance the sealing effect. In this invention, the plunger rod 2 and the metal sleeve 4 cooperate, which, compared with the prior art where the plunger rod 2 is directly connected to the plastic pump body 1, has better wear resistance and is less prone to wear. The plunger rod 2 and the metal sleeve are less likely to wobble due to gaps, thus reducing the frequency of replacement.

[0020] Preferably, the metal sleeve 4 can be made of a metal material with good wear resistance.

[0021] Preferably, the metal sleeve 4 and the movable cavity 3 can be connected by threads, which makes disassembly and installation easier even if replacement is required.

[0022] The check valve structure 7 includes a valve ball 701 that slides within the movable chamber 3 in cooperation with the plunger rod 2, and a spring 702 that drives the valve ball 701 to block the passage chamber 5. One end of the spring 702 is located in the movable chamber 3 away from the plunger rod, and the other end is connected to the valve ball 701. When the spring 702 is not compressed, it can drive the valve ball 701 to connect to the metal sleeve 4 and block one end of the passage chamber 5.

[0023] The oil inlet 9 is connected to the oil tank, and the oil outlet 10 is connected to the lubrication oil circuit.

[0024] Preferably, one end of the plunger rod 2 is located inside the pump body 1, and the other end is provided with a pull ring 6, which facilitates the pulling of the plunger rod 2.

[0025] The specific oil pumping process is as follows:

[0026] Pulling the plunger rod 2 outward creates a negative pressure in cavity 5, allowing lubricating oil to enter through cavity 5 via oil inlet hole 9 and oil inlet channel 8. At this time, the plunger rod 2 moves rapidly inward, pushing valve ball 701 away from metal sleeve 4, simultaneously pushing most of the lubricating oil into movable cavity 3. Pulling the plunger rod 2 outward again performs a secondary pumping operation. This time, valve ball 701, driven by spring 702, will again contact metal sleeve 4, sealing one end of cavity 5, preventing most of the lubricating oil in movable cavity 3 from flowing back into cavity 5, but instead retaining it within movable cavity 3. Repeatedly pulling the plunger rod 2 pumps oil until sufficient lubricating oil accumulates in movable cavity 3, at which point the lubricating oil flows from oil outlet hole 10 into the lubrication path for lubrication.

[0027] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A plunger pump structure, comprising a pump body (1) and a plunger rod (2) sliding within the pump body, wherein the pump body is provided with an oil inlet (9) and an oil outlet (10), and the pump body (1) is provided with a movable cavity (3) for the plunger rod (2) to move, and the movable cavity (3) is provided with a check valve structure (7) that cooperates with the plunger rod (2) to pump oil, characterized in that: A metal sleeve (4) is provided between the plunger rod (2) and the movable cavity (3). The metal sleeve (4) is sealed and connected to one end of the pump body (1) near the plunger rod (2). The metal sleeve (4) is provided with a passage cavity (5) for the plunger rod (2) to pass through. An oil inlet channel (8) is also provided between the oil inlet hole (9) of the pump body (1) and the passage cavity (5) of the metal sleeve (4).

2. The plunger pump structure as described in claim 1, characterized in that: The check valve structure (7) includes a valve ball (701) that slides in cooperation with the plunger rod (2) in the movable cavity (3) and a spring (702) that drives the valve ball (701) to fill the passage cavity (5).

3. The plunger pump structure as described in claim 2, characterized in that: One end of the spring (702) is located in the movable cavity (3) away from the plunger rod, and the other end is connected to the valve ball (701).

4. The plunger pump structure as described in claim 1, characterized in that: The metal sleeve (4) and the movable cavity (3) can be connected by threads.

5. The plunger pump structure as described in claim 1, characterized in that: The plunger rod (2) is located inside the pump body (1) at one end and has a pull ring (6) at the other end.

6. The plunger pump structure as described in claim 1, characterized in that: The oil inlet (9) is connected to the oil tank, and the oil outlet (10) is connected to the lubrication oil circuit.

Images