Wear-resistant plunger of plunger pump

Abstract

The utility model discloses a wear-resistant plunger of a plunger pump, which relates to the technical field of pump body parts and comprises a cylinder, a first sealing strip and a second sealing strip are arranged on the outer side wall of the cylinder, a sealing cylinder is arranged in the cylinder, a diaphragm is arranged in the middle of a cavity of the sealing cylinder, a first air storage bag is arranged at the bottom end of the first sealing strip, and a second air storage bag is arranged at the bottom end of the second sealing strip. The sealing barrel is arranged in the cylinder body, the inner cavity of the sealing barrel is divided into two parts through the membrane, the two inner cavities are communicated with the first air storage bag and the second air storage bag respectively, when the cylinder body moves in the cylinder body, the position of the membrane is adjusted according to different pressures and resistances, and therefore the sealing barrel is sealed, and the sealing barrel is sealed. The expansion degree of the first air storage bag and the second air storage bag is controlled, so that the tight fit degree between the first sealing strip and the inner wall of the cylinder body and the tight fit degree between the second sealing strip and the inner wall of the cylinder body are adjusted, the abrasion time of the sealing strips is shortened, and the service life of the sealing strips is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pump body parts, in particular to a wear-resistant plunger of a plunger pump. Background Art

[0002] A plunger is a mechanical component that is commonly used in equipment such as pumps, engines, and cylinders. Its main function is to move fluid or gas in a closed space through reciprocating motion. In hydraulic and pneumatic systems, the plunger can control the flow and pressure of the fluid, thereby achieving power transmission. The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation.

[0003] In order to ensure the sealing of the pump body, a sealing ring is generally provided on the outside of the cylinder to prevent the water inside the cylinder from flowing out, and to prevent the air outside the cylinder from leaking in. The movement of the plunger is inevitably accompanied by wear of the sealing ring. However, in the prior art, when the sealing ring on the plunger works in the cylinder, only the sealing ring on one side works, and the sealing ring is always in a state of tight fit and high wear during operation, which will inevitably affect the service life of the plunger pump. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that when the sealing ring on the plunger works in the cylinder body, only the sealing ring on one side plays a role, and the sealing ring is always in a state of tight fit and high wear during operation, which inevitably affects the service life of the plunger pump, and proposes a wear-resistant plunger for the plunger pump.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a wear-resistant plunger of a plunger pump, comprising a column, the outer wall of the column is provided with sealing strip 1 and sealing strip 2, the interior of the column is provided with a sealing cylinder, the middle position of the chamber of the sealing cylinder is provided with a diaphragm, the bottom end of the sealing strip 1 is provided with air bag 1, the bottom end of the sealing strip 2 is provided with air bag 2, the bottom ends of the air bag 1 and the air bag 2 are both connected with air guide tubes, the air bag 1 and the air bag 2 are respectively connected with the two side chambers of the sealing cylinder through the air guide tubes, a side surface of the diaphragm is fixedly connected with a sliding column, one end of the sliding column passes through the outer wall of the column and is fixedly connected with a baffle.

[0006] Preferably, a support sleeve is fixedly connected to the other side surface of the diaphragm, and the support sleeve penetrates the diaphragm and is connected to the sliding column.

[0007] Preferably, a spring is provided between the support sleeve and the inner side wall of the column.

[0008] Preferably, one end of the spring is fixedly connected to the support sleeve, and the other end of the spring is fixedly connected to the inner wall of the column.

[0009] Preferably, a damper is provided at the axis of the spring.

[0010] Preferably, the outer side wall of the column is provided with a rubber ring, and the rubber ring is respectively located on both sides of the sealing strip 1 and the sealing strip 2.

[0011] Preferably, the other end of the column is fixedly connected to a connecting arm, and one end of the connecting arm is fixedly connected to a ball hinge.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. In the utility model, a sealing cylinder is arranged inside the cylinder, and the inner cavity of the sealing cylinder is divided into two parts by a diaphragm, and the two inner cavities are respectively connected with the air storage bag 1 and the air storage bag 2. When the cylinder moves in the cylinder, the position of the diaphragm is adjusted according to the different pressures and resistances, and the expansion degree of the air storage bag 1 and the air storage bag 2 is controlled, so as to adjust the tight fit between the sealing strip 1 and the sealing strip 2 and the inner wall of the cylinder, reduce the wear time of the sealing strip, and thus extend the service life of the sealing strip.

[0014] 2. In the utility model, a spring and a damper are arranged on the inner side of the diaphragm, and the spring and the sliding column are respectively located at the two ends of the diaphragm, and the spring and the sliding column reach a dynamic balance at the diaphragm, so as to utilize the water pressure in the cylinder body to control the extension stroke of the sliding column, thereby achieving the effect of controlling the deformation degree of the diaphragm, meeting the effect of automatically controlling the tightness of the sealing strip and the cylinder body, and reducing unnecessary wear of the sealing strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model proposes a three-dimensional structure diagram of a wear-resistant plunger of a plunger pump Figure 1 ;

[0016] Figure 2 The utility model proposes a three-dimensional structure diagram of a wear-resistant plunger of a plunger pump Figure 2 ;

[0017] Figure 3 The utility model provides a schematic diagram of the internal structure of a wear-resistant plunger of a plunger pump;

[0018] Figure 4 The utility model provides a side structural sectional view of a sealing cylinder in a wear-resistant plunger of a plunger pump.

[0019] Legend: 1. Column; 2. Sealing strip 1; 3. Sealing strip 2; 4. Rubber ring; 5. Connecting arm; 6. Ball hinge; 7. Baffle; 8. Sliding column; 9. Sealing cylinder; 10. Air bag 1; 11. Air guide tube; 12. Diaphragm; 13. Support sleeve; 14. Spring; 15. Damper; 16. Air bag 2. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0022] Embodiment 1: Figure 1-4 As shown, the utility model provides a wear-resistant plunger of a plunger pump, comprising a column 1, the outer wall of the column 1 is provided with a sealing strip 2 and a sealing strip 3, a sealing cylinder 9 is provided inside the column 1, a diaphragm 12 is provided at the middle position of the chamber of the sealing cylinder 9, an air storage bag 10 is provided at the bottom end of the sealing strip 2, an air storage bag 2 16 is provided at the bottom end of the sealing strip 2 3, the bottom ends of the air storage bags 10 and 16 are both connected with air guide tubes 11, the air storage bags 10 and 16 are respectively connected with the chambers on both sides of the sealing cylinder 9 through the air guide tubes 11, a sliding column 8 is fixedly connected to one side of the diaphragm 12, and one end of the sliding column 8 passes through the outer wall of the column 1 and is fixedly connected to a baffle 7.

[0023] The specific configuration and function of this embodiment are described in detail below. The plunger pump is divided into four parts: a distribution plate, a cylinder body, a plunger and a swash plate. The cylinder bodies are arranged in a circular array on the distribution plate. A plunger cooperates in each cylinder body. The other end of the plunger is connected to the swash plate, resulting in different strokes of the plungers in different directions of the swash plate extending into the cylinder body. The externally driven input shaft is connected to the swash plate, and the swash plate is driven to rotate to drive each plunger to reciprocate in the cylinder body. When the plunger is pulled, a negative pressure is formed in the cylinder body, and water is absorbed by the negative pressure. When the plunger is pushed, a positive pressure is formed in the cylinder body, and water is discharged by the positive pressure. A sealing strip 1 2 and a sealing strip 2 3 are provided on the cylinder body 1;

[0024] The position of the sealing strip 2 is closer to the inclined plate, and the position of the sealing strip 3 is closer to the distribution plate. When the column 1 is pushed into the cylinder, the interaction force of the water inside the cylinder on the column 1 is greater, and the sealing effect of the sealing strip 3 is needed to seal the water in the cylinder. At this time, the interaction force of the air outside the cylinder on the sealing strip 2 is smaller, and the sealing demand of the sealing strip 2 for air is reduced. The baffle 7 on the outer wall of the column 1 moves inward after being subjected to resistance, so that the sliding column 8 drives the diaphragm 12 to deform to one side, changing the volume of the chambers on both sides of the sealing cylinder 9, and increasing the volume of the chamber connected with the air storage bag 10. The pressure of the air storage bag 10 is reduced, thereby reducing the expansion amount of the air storage bag 10, reducing the contact degree between the sealing strip 2 and the inner wall of the cylinder, thereby reducing the wear of the sealing strip 2;

[0025] When the column 1 is stretched from the cylinder body, the interaction force of the water in the cylinder body on the sealing strip 2 3 is reduced, so there is no need for the sealing strip 2 3 to fit too tightly with the inner wall of the cylinder body. On the contrary, the interaction force of the air outside the cylinder body on the sealing strip 2 increases, and it is necessary to increase the tight fit between the sealing strip 2 and the inner wall of the cylinder body to achieve sealing. Since the resistance of the baffle 7 in the cylinder body is reduced, the deformation of the diaphragm 12 caused by the sliding column 8 is smaller, and the volume of the chamber on both sides of the sealing tube 9 is changed again, and the volume of the chamber connected to the air bag 2 16 is increased. The pressure of the air bag 2 16 becomes lower, the expansion amount of the air bag 2 16 is reduced, and the contact degree between the sealing strip 2 3 and the inner wall of the cylinder body is reduced. During the reciprocating motion of the plunger, the degree of seal wear on the side with lower sealing requirements is always reduced, thereby doubling the wear resistance of the plunger.

[0026] Embodiment 2: Figure 2 and Figure 4 As shown, the other side of the diaphragm 12 is fixedly connected with a support sleeve 13, which penetrates the diaphragm 12 and is connected to the sliding column 8. A spring 14 is arranged between the support sleeve 13 and the inner wall of the column 1. One end of the spring 14 is fixedly connected to the support sleeve 13, and the other end of the spring 14 is fixedly connected to the inner wall of the column 1. A damper 15 is arranged at the axis of the spring 14. The outer wall of the column 1 is provided with a rubber ring 4, which is respectively located on the two outer sides of the sealing strip 1 2 and the sealing strip 2 3. The other end of the column 1 is fixedly connected with a connecting arm 5, and one end of the connecting arm 5 is fixedly connected with a ball hinge 6.

[0027] The effect achieved by the entire embodiment is that, since the diaphragm 12 is located inside the sealing cylinder 9, the internal space of the sealing cylinder 9 is divided into two. The diaphragm 12 is in a planar state when there is no external force. At this time, the chamber volumes on both sides of the sealing cylinder 9 are the same. When the diaphragm 12 is compressed by one side, the diaphragm 12 changes into a boss shape, and the chamber volumes on both sides change. In order to balance the compression on both sides of the diaphragm 12, a spring 14 is arranged on the other side of the diaphragm 12. The elastic force of the spring 14 on the diaphragm 12 is used to resist the pressure of the sliding column 8 to achieve a balance. When the column 1 needs to be connected to the swash plate, the ball hinge 6 is hinged to the swash plate, so that the rotation of the swash plate drives the plunger to rotate, thereby driving the effect of adjusting the movement of the column 1 in the cylinder body.

[0028] The use method and working principle of the device: when the plunger is pushed in, the interaction force of the air outside the cylinder body on the sealing strip 2 is small, and the baffle 7 on the outer wall of the cylinder body 1 moves inward after being resisted, so that the sliding column 8 drives the diaphragm 12 to deform to one side, changing the volume of the chambers on both sides of the sealing cylinder 9, increasing the volume of the chamber connected with the air storage bag 10, and reducing the pressure of the air storage bag 10, thereby reducing the expansion amount of the air storage bag 10 and reducing the contact degree between the sealing strip 2 and the inner wall of the cylinder body;

[0029] When the plunger is pulled out, the interaction force of the water in the cylinder body on the sealing strip 23 is reduced, the resistance encountered by the baffle 7 in the cylinder body is reduced, and the deformation amount of the diaphragm 12 caused by the sliding column 8 is smaller, which changes the volume of the chambers on both sides of the sealing tube 9 again, increases the volume of the chamber connected to the air bag 2 16, reduces the pressure of the air bag 2 16, reduces the expansion amount of the air bag 2 16, and reduces the contact degree between the sealing strip 2 3 and the inner wall of the cylinder body.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A wear-resistant plunger of a plunger pump, comprising a column (1), wherein the outer side wall of the column (1) is provided with a sealing strip 1 (2) and a sealing strip 2 (3), characterized in that: A sealing cylinder (9) is arranged inside the column (1), a diaphragm (12) is arranged in the middle position of the chamber of the sealing cylinder (9), an air storage bag (10) is arranged at the bottom end of the sealing strip (2), an air storage bag (16) is arranged at the bottom end of the sealing strip (3), the bottom ends of the air storage bags (10) and (16) are connected to air guide tubes (11), the air storage bags (10) and (16) are connected to the chambers on both sides of the sealing cylinder (9) through the air guide tubes (11), one side of the diaphragm (12) is fixedly connected to a sliding column (8), one end of the sliding column (8) passes through the outer wall of the column (1) and is fixedly connected to a baffle (7).

2. A wear-resistant plunger for a plunger pump according to claim 1, characterized in that: A support sleeve (13) is fixedly connected to the other side of the diaphragm (12); the support sleeve (13) penetrates the diaphragm (12) and is connected to the sliding column (8).

3. A wear-resistant plunger for a plunger pump according to claim 2, characterized in that: A spring (14) is arranged between the support sleeve (13) and the inner side wall of the column (1).

4. A wear-resistant plunger for a plunger pump according to claim 3, characterized in that: One end of the spring (14) is fixedly connected to the support sleeve (13), and the other end of the spring (14) is fixedly connected to the inner wall of the column (1).

5. The wear-resistant plunger of a plunger pump according to claim 3, characterized in that: A damper (15) is arranged at the axis of the spring (14).

6. The wear-resistant plunger of a plunger pump according to claim 1, characterized in that: The outer wall of the column (1) is provided with a rubber ring (4), and the rubber ring (4) is respectively located on the outer sides of the first sealing strip (2) and the second sealing strip (3).

7. The wear-resistant plunger of a plunger pump according to claim 1, characterized in that: The other end of the column (1) is fixedly connected to a connecting arm (5), and one end of the connecting arm (5) is fixedly connected to a ball hinge (6).

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