Reciprocating pump plunger connecting structure

Abstract

The utility model discloses a plunger connecting structure of a reciprocating pump. The plunger connecting structure comprises a sliding block, a pressure-bearing block, a semicircular ring, a pressing sleeve and a plunger, a convex cylindrical cavity with an opening is formed in the middle of one end of the sliding block, the convex cylindrical cavity is formed by communicating a small cylindrical cavity with a large cylindrical cavity, and the pressure bearing block is arranged in the small cylindrical cavity; the front end of the plunger is a sliding block connecting end, and the sliding block connecting end comprises a convex cylindrical section, a transition circular truncated cone section and a smooth cylindrical section which are fixedly connected in sequence; the smooth cylindrical section is sleeved with the pressing sleeve, the two semicircular rings are spliced with each other and clamped to the outer circle face of the convex cylindrical section, the plunger end face of the convex cylindrical section of the plunger makes contact with the end face of the pressure bearing block, the outer circle face of the front end of the pressing sleeve is in threaded connection with the inner wall of the large cylindrical cavity of the sliding block, and after threaded connection, the sliding block is in threaded connection with the pressing sleeve. And the annular groove at the front end of the pressing sleeve can be clamped on the end surfaces and the outer circular surfaces of the two semicircular rings. According to the reciprocating pump plunger connecting structure, the plunger and the sliding block can be integrated, and the coaxiality of the plunger and the sliding block can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of plungers, in particular to a reciprocating pump plunger connection structure. Background Art

[0002] The plunger is a key hydraulic component for an electric reciprocating pump to convert the rotary motion of the motor into a reciprocating motion. Among them, the motor drives a slider to reciprocate through a crank connecting rod mechanism. The slider is connected to the plunger, and then drives the plunger to reciprocate.

[0003] The connection between the plunger and the slider requires ensuring the coaxiality of the plunger and the slider. If the coaxiality of the plunger and the slider is not good, the plunger will cause eccentric wear to the seal during operation, affecting the service life of the seal, resulting in leakage of the working fluid, polluting the environment, reducing the volumetric efficiency and working time of the reciprocating pump, increasing the frequency of maintenance and repair, and greatly reducing the reliability and stability of the product.

[0004] Therefore, a connection method that can ensure the coaxiality of the plunger and the slider is needed. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a reciprocating pump plunger connection structure for the above-mentioned existing technology. This reciprocating pump plunger connection structure can integrate the plunger and the slider to ensure the coaxiality of the plunger and the slider.

[0006] To achieve the above technical purpose, the technical solution adopted by the utility model is as follows:

[0007] A reciprocating pump plunger connection structure includes a slider, a pressure-bearing block, semi-circular rings, a pressure sleeve, and a plunger;

[0008] An open convex cylindrical cavity is formed in the middle of one end of the slider. The convex cylindrical cavity is formed by the mutual connection of a small cylindrical cavity and a large cylindrical cavity. The pressure-bearing block is placed in the small cylindrical cavity;

[0009] The front end of the plunger is a slider connection end. The slider connection end includes a convex cylindrical section, a transition frustum section, and a smooth cylindrical section that are fixedly connected in sequence;

[0010] The pressure sleeve is sleeved on the outside of the smooth cylindrical section. Two semi-circular rings are spliced with each other and clamped on the outer circular surface of the convex cylindrical section. The plunger end surface of the convex cylindrical section of the plunger contacts the end surface of the pressure-bearing block. The outer circular surface of the front end of the pressure sleeve is threadedly connected to the inner wall of the large cylindrical cavity of the slider. After the threaded connection, the circular groove at the front end of the pressure sleeve can be clamped on the end surface and the outer circular surface of the two semi-circular rings.

[0011] As a further improved technical solution of the utility model, the inner circular surface of the semi-circular ring is clamped with the first outer circular surface of the convex cylindrical section, and the inner table surface of the semi-circular ring is clamped with the first outer table surface of the convex cylindrical section.

[0012] As a further improved technical solution of the present utility model, the first inner circular surface of the circular groove at the front end of the pressure sleeve is clamped with the second outer circular surface of the semi-circular ring, and the first inner table surface of the circular groove at the front end of the pressure sleeve is clamped with the outer end surface of the semi-circular ring.

[0013] As a further improved technical solution of the present utility model, the second outer circular surface of the semi-circular ring is in small clearance fit with the second inner circular surface of the small cylindrical cavity of the slider.

[0014] As a further improved technical solution of the present utility model, a convex circle is provided at the rear end of the pressure sleeve, a notch is provided on the convex circle, a bolt is connected to the slider, and the bolt is located in the notch.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The pressure sleeve of the present utility model is first installed on the smooth cylindrical section of the plunger through the slider connection end of the plunger. The inner circular surfaces and inner table surfaces of the two semi-circular rings are respectively matched and positioned with the first outer circular surface and the first outer table surface of the plunger. The pressure sleeve positions and presses firmly the two semi-circular rings through the first inner circular surface and the first inner table surface. The plunger end surface of the plunger contacts the pressure-bearing block. The second outer circular surface of the semi-circular ring is matched with the second inner circular surface of the slider. Through the threaded fastening between the pressure sleeve and the slider, the plunger and the slider are formed into one body, ensuring the coaxiality of the plunger and the slider, and the plunger will not cause eccentric wear to the seal during operation. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a reciprocating pump plunger connection structure. Detailed Embodiments

[0018] The following further describes the detailed embodiments of the present utility model according to the drawings:

[0019] As Figure 1 shown, a reciprocating pump plunger connection structure includes a slider 1, a pressure-bearing block 2, a semi-circular ring 3, a pressure sleeve 4, and a plunger 5.

[0020] An open convex cylindrical cavity is provided in the middle of one end of the slider 1. The convex cylindrical cavity is formed by the mutual communication of a small cylindrical cavity and a large cylindrical cavity. The pressure-bearing block 2 is placed in the small cylindrical cavity. The outer circular surface of the pressure-bearing block 2 is in small clearance fit with the inner circular surface of the small cylindrical cavity, which is convenient for loading.

[0021] As Figure 1 shown, the front end of the plunger 5 is a slider connection end, and the slider connection end includes a convex cylindrical section 501, a transition frustum section 502, and a smooth cylindrical section 503 that are fixedly connected in sequence.

[0022] The pressure sleeve 4 is sleeved outside the smooth cylindrical section 503 and can slide outside the smooth cylindrical section 503. The two semi-circular rings 3 are spliced with each other and clamped on the outer circular surface of the convex cylindrical section 501. The plunger end face e of the convex cylindrical section 501 of the plunger 5 contacts the end face of the pressure-bearing block 2. The outer circular surface at the front end of the pressure sleeve 4 is threadedly connected to the inner wall of the large cylindrical cavity of the slider 1. After the threaded connection, the circular groove at the front end of the pressure sleeve 4 can be clamped on the end faces and outer circular surfaces of the two semi-circular rings 3.

[0023] In this embodiment, the inner circular surface of the semi-circular ring 3 is clamped with the first outer circular surface f of the convex cylindrical section 501, and the inner table surface of the semi-circular ring 3 is clamped with the first outer table surface g of the convex cylindrical section 501.

[0024] In this embodiment, the first inner circular surface a of the circular groove at the front end of the pressure sleeve 4 is clamped with the second outer circular surface b of the semi-circular ring 3, and the first inner table surface d of the circular groove at the front end of the pressure sleeve 4 is clamped with the outer end face of the semi-circular ring 3.

[0025] In this embodiment, the second outer circular surface b of the semi-circular ring 3 is in small clearance fit with the second inner circular surface c of the small cylindrical cavity of the slider 1.

[0026] In this embodiment, as Figure 1 shown, a convex circle 401 is provided at the rear end of the pressure sleeve 4, a notch 4011 is provided on the convex circle 401, a bolt 6 is connected to the slider 1, and the bolt 6 is located in the notch 4011. The bolt 6 has a positioning function and can prevent the threaded connection between the pressure sleeve 4 and the slider 1 from loosening.

[0027] In this embodiment, the pressure sleeve 4 is first installed on the smooth cylindrical section 503 of the plunger through the small end of the plunger (i.e., the connection end of the slider). The inner circular surface and inner table surface of the two semi-circular rings 3 are respectively matched and positioned with the first outer circular surface f and the first outer table surface g of the plunger. The pressure sleeve 4 positions and firmly presses the two semi-circular rings through the first inner circular surface a and the first inner table surface d. The plunger end face e of the small end of the plunger contacts the pressure-bearing block 2. The second outer circular surface b of the semi-circular ring is matched with the second inner circular surface c of the slider 1. Through the threaded fastening between the pressure sleeve 4 and the slider 1, the plunger 5 and the slider 1 are formed into one body, ensuring the coaxiality of the plunger 5 and the slider 1.

[0028] The protection scope of the present utility model includes but is not limited to the above embodiments. The protection scope of the present utility model is subject to the claims. Any replacement, deformation, and improvement that are easily conceivable by those skilled in the art to this technology fall within the protection scope of the present utility model.

Claims

1. A reciprocating pump plunger connection structure, characterized in that, It includes a slider (1), a pressure-bearing block (2), a semi-circular ring (3), a pressure sleeve (4) and a plunger (5); A convex cylindrical cavity with an open end is formed in the middle of one end of the slider (1). The convex cylindrical cavity is formed by the interconnection of a small cylindrical cavity and a large cylindrical cavity, and the pressure-bearing block (2) is placed in the small cylindrical cavity; The front end of the plunger (5) is a slider connection end, and the slider connection end includes a convex cylindrical section (501), a transition frustum section (502) and a smooth cylindrical section (503) that are fixedly connected in sequence; The pressure sleeve (4) is sleeved outside the smooth cylindrical section (503). The two semi-circular rings (3) are spliced with each other and clamped on the outer circular surface of the convex cylindrical section (501). The plunger end face (e) of the convex cylindrical section (501) of the plunger (5) is in contact with the end face of the pressure-bearing block (2). The outer circular surface of the front end of the pressure sleeve (4) is threadedly connected to the inner wall of the large cylindrical cavity of the slider (1). After the threaded connection, the circular groove at the front end of the pressure sleeve (4) can be clamped on the end faces and the outer circular surfaces of the two semi-circular rings (3).

2. The reciprocating pump plunger connection structure according to claim 1, characterized in that: The inner circular surface of the semi-circular ring (3) is clamped with the first outer circular surface (f) of the convex cylindrical section (501), and the inner table surface of the semi-circular ring (3) is clamped with the first outer table surface (g) of the convex cylindrical section (501).

3. The reciprocating pump plunger connection structure according to claim 1, characterized in that: The first inner circular surface (a) of the circular groove at the front end of the pressure sleeve (4) is clamped with the second outer circular surface (b) of the semi-circular ring (3), and the first inner table surface (d) of the circular groove at the front end of the pressure sleeve (4) is clamped with the outer end face of the semi-circular ring (3).

4. The reciprocating pump plunger connection structure according to claim 1, characterized in that, The second outer circular surface (b) of the semi-circular ring (3) has a small clearance fit with the second inner circular surface (c) of the small cylindrical cavity of the slider (1).

5. The reciprocating pump plunger connection structure according to claim 1, characterized in that: A convex circle (401) is provided at the rear end of the pressure sleeve (4), and a notch (4011) is provided on the convex circle (401). A bolt (6) is connected to the slider (1), and the bolt (6) is located in the notch (4011).

Images