Piston sealing assembly

Abstract

The utility model discloses a piston sealing assembly which comprises a piston head body, a sealing groove is formed in the circumferential face of the piston head body, an O-shaped ring tightly connected with the sealing groove is embedded in the sealing groove in a sleeved mode, and the highest point of the O-shaped ring protrudes out of the circumferential face of the piston head body. Scraping lips are arranged on the circumferential face of the piston head body and close to the top edges of the two side end faces, and the highest points of the scraping lips protrude out of the circumferential face of the piston head body. The highest points of the scraping lips on the two sides of the piston head body protrude out of the circumferential face of the piston head body, and the scraping lips on the two sides of the piston head body make contact with fine particles attached to the inner wall of a plunger rod cylinder barrel earlier than the piston head body. The scraping lip protruding out of the piston head body can scrape away fine particles attached to the inner wall of the cylinder barrel, the fine particles are prevented from remaining on the inner wall of the cylinder barrel, then the influence of the fine particles on the piston and the cylinder barrel is reduced, the sealing performance of the plunger type cylinder in the working environment with particle media is improved, energy loss is reduced, and the service life of the plunger type cylinder is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of piston sealing technology, and in particular to a piston sealing assembly. Background Technology

[0002] The piston cylinder is a core actuator in a hydraulic system that enables unidirectional transmission. Its working principle is based on the linear reciprocating motion of a piston within the cylinder, converting hydraulic energy into mechanical energy. The piston cylinder consists of core components such as the cylinder and piston. During operation, the seal between the cylinder wall and the piston is crucial, as its sealing performance is a core element in maintaining system efficiency.

[0003] When plunger cylinders are used in environments with particulate media, fine particles can easily remain on the inner wall of the cylinder. When the piston moves to the area on the cylinder wall with these particles, they can easily enter the space between the piston and the cylinder wall. This increases friction between the piston and the cylinder wall, leading to energy loss. Furthermore, during piston movement, the piston's circumferential surface and the cylinder wall are prone to wear, affecting the sealing performance between them and impacting the service life of the plunger. Therefore, for plunger cylinders used in environments with particulate media for extended periods, there is an urgent need to design a piston sealing assembly to reduce the impact of fine particles on the piston and cylinder wall. Summary of the Invention

[0004] The purpose of this invention is to provide a piston sealing assembly that solves the problems of poor sealing performance and high energy loss of existing pistons when used in working environments with particulate media.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A piston sealing assembly includes a piston head body, a sealing groove is provided on the circumferential surface of the piston head body, an O-ring is nested in the sealing groove and the highest point of the O-ring protrudes from the circumferential surface of the piston head body; scraping lips are provided on the top edges of the circumferential surface of the piston head body near the two end faces, and the highest point of the scraping lips protrudes from the circumferential surface of the piston head body.

[0007] Furthermore, a first V-shaped groove is formed between the bottom surface of one side of the scraping lip and the circumferential surface of the piston head body, and a second V-shaped groove is formed between the bottom surface of the other side of the scraping lip and the end face of the circumferential surface of the piston head body.

[0008] Furthermore, the scraping lips on both sides are located within the space formed by the end faces on both sides of the piston head body.

[0009] Furthermore, a connecting cavity for mounting the piston rod is provided on the end face of the piston head body near the piston rod, and a plurality of threaded holes are provided in the connecting cavity.

[0010] Furthermore, the piston head body has an inwardly recessed cavity on the end face away from the piston rod.

[0011] Furthermore, the scraper lip is made of rubber.

[0012] Furthermore, the number of sealing grooves and O-rings is two each.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, a sealing groove is formed on the circumferential surface of the piston head body, and an O-ring is installed in the sealing groove. The O-ring is in close contact with the inner wall of the cylinder, achieving a reliable radial seal between the two during the reciprocating motion of the piston head body, effectively preventing fluid leakage and ensuring the normal operation of the system. Furthermore, the highest point of the scraper lips on both sides of the piston head body protrudes from the circumferential surface of the piston head body. The scraper lips on both sides of the piston head body contact the fine particles attached to the inner wall of the piston cylinder before the piston head body itself. During the movement of the piston head body within the cylinder, the scraper lips protruding from the piston head body can scrape away the fine particles attached to the inner wall of the cylinder, preventing the residue of fine particles on the inner wall of the cylinder, thereby reducing the impact of fine particles on the piston and cylinder, improving the sealing performance of the piston cylinder in working environments with particulate media, reducing energy loss, and increasing the service life of the piston cylinder.

[0015] In this invention, a first V-shaped groove is formed between the bottom surface of one side of the scraper lip and the circumferential surface of the piston head body, and a second V-shaped groove is formed between the bottom surface of the other side of the scraper lip and the end face of the circumferential surface of the piston head body. On the one hand, when the scraper lip is subjected to compression deformation and reciprocating motion and is subjected to frictional force from the inner wall of the cylinder, the geometric space of the first V-shaped groove and the second V-shaped groove allows the scraper lip to elastically deform, avoiding tearing at the root of the scraper lip. On the other hand, the first V-shaped grooves on both sides of the piston head body can also serve as two sealing structures to further prevent fluid leakage on both sides. The inclined structure in the second V-shaped groove can also play a guiding role. After the scraper lip scrapes away the fine particles attached to the inner wall of the cylinder, the fine particles can move towards the center of the cylinder under the guidance of the inclined surface on the second V-shaped groove. At the same time, it can also serve as a temporary dust collection chamber to reduce the return of fine particles to the inner wall of the cylinder. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a schematic diagram of the piston sealing assembly of this utility model;

[0019] Figure 2 This is a schematic diagram of the piston sealing assembly installed inside the cylinder in this utility model;

[0020] Figure 3 for Figure 2 Enlarged diagram of point A in the diagram.

[0021] Illustration: 1. Piston head body; 11. Scraper lip; 12. Sealing groove; 13. First V-groove; 14. Second V-groove; 15. Connecting cavity; 16. Mounting hole; 17. Recessed cavity; 2. O-ring; 3. Cylinder. Detailed Implementation

[0022] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] This utility model embodiment provides a piston sealing assembly, combined with Figures 1-3 As shown, the piston sealing assembly includes a piston head body 1. A sealing groove 12 is provided on the circumferential surface of the piston head body 1. An O-ring 2 is nested tightly within the sealing groove 12, with the highest point of the O-ring 2 protruding from the circumferential surface of the piston head body 1. The O-ring 2 is in close contact with the inner wall of the cylinder 3, achieving a reliable radial seal between the two during the reciprocating motion of the piston head body 1, effectively preventing fluid leakage and ensuring the normal operation of the system. This invention uses two sealing grooves 12 and two O-rings 2, further enhancing the overall sealing effect.

[0026] The piston head body 1 has scraper lips 11 on the top edge near the two end faces on the circumferential surface. The scraper lips 11 are made of rubber and have excellent wear resistance, resistance to media corrosion, and elastic deformation capability. The highest point of the scraper lips 11 protrudes from the circumferential surface of the piston head body 1. The scraper lips 11 on both sides of the piston head body 1 contact the fine particles attached to the inner wall of the piston cylinder 3 before the piston head body 1. During the movement of the piston head body 1 in the cylinder 3, the scraper lips 11 protruding from the piston head body 1 can scrape away the fine particles attached to the inner wall of the cylinder, preventing the fine particles from remaining on the inner wall of the cylinder 3. This reduces the impact of fine particles on the piston and cylinder 3, improves the sealing performance of the piston cylinder in the working environment with particulate media, reduces energy loss, and increases the service life of the piston cylinder. In this embodiment, the diameter of the highest point of the scraping lip 11 is greater than or equal to the diameter of the cylinder 3 that matches the piston head body 1, and the diameter of the piston head body 1 is smaller than the diameter of the cylinder 3 that matches the piston head body 1. This allows the scraping lip 11 to better scrape off the fine particles on the inner wall of the cylinder 3.

[0027] In this invention, a first V-groove 13 is formed between the bottom surface of one side of the scraper lip 11 and the circumferential surface of the piston head body 1, and a second V-groove 14 is formed between the bottom surface of the other side of the scraper lip 11 and the end face of the circumferential surface of the piston head body 1. On the one hand, when the scraper lip is subjected to compression deformation and reciprocating motion and is subjected to frictional force from the inner wall of the cylinder, the geometric space of the first V-groove 13 and the second V-groove 14 allows the scraper lip to elastically deform, avoiding tearing at the root of the scraper lip; on the other hand, the first V-groove 13 on both sides of the piston head body 1 can also serve as two sealing structures to further prevent fluid leakage on both sides; and the inclined structure in the second V-groove 14 can also play a guiding role. After the scraper lip 11 scrapes away the fine particles attached to the inner wall of the cylinder 3, the fine particles can move towards the center of the cylinder 3 under the guidance of the inclined surface on the second V-groove 14, and at the same time, it can serve as a temporary dust collection chamber to reduce the return of fine particles to the inner wall of the cylinder. Furthermore, the outlines of the scraper lips 11 on both sides are located within the space formed by the end faces of the piston head body 1 on both sides. When the piston head body 1 is pressed into the cylinder 3, if the scraper lips 11 extend beyond the end face, they will first collide with the cylinder port chamfer. This arrangement can prevent the scraper lips 11 from colliding with the end face of the cylinder 3 and the cylinder port chamfer.

[0028] The piston head body 1 of this invention has a connecting cavity 15 for mounting the piston rod on one end face near the piston rod. The connecting cavity 15 has several mounting holes 16 to facilitate the connection between the piston rod and the piston head body 1. Additionally, the piston head body 1 has an inwardly recessed cavity 17 on one end face away from the piston rod. This cavity 17 can serve as a temporary storage area for small particles, especially when the piston head body 1 moves to the cylinder end face. If there is no space to accommodate these particles, the scraped-off particles are easily squeezed and moved back towards the inner wall of the cylinder.

[0029] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A piston sealing assembly, characterized in that, The piston head body (1) includes a sealing groove (12) on the circumferential surface of the piston head body (1), and an O-ring (2) is nested in the sealing groove (12) and the highest point of the O-ring (2) protrudes from the circumferential surface of the piston head body (1); scraping lips (11) are provided on the top edge of the circumferential surface of the piston head body (1) near the two end faces, and the highest point of the scraping lip (11) protrudes from the circumferential surface of the piston head body (1).

2. The piston sealing assembly according to claim 1, characterized in that, A first V-groove (13) is formed between the bottom surface of one side of the scraper lip (11) and the circumferential surface of the piston head body (1), and a second V-groove (14) is formed between the bottom surface of the other side of the scraper lip (11) and the end face of the circumferential surface of the piston head body (1).

3. The piston sealing assembly according to claim 1, characterized in that, The contours of the scraping lips (11) on both sides are located within the space formed by the end faces of both sides of the piston head body (1).

4. The piston sealing assembly according to claim 1, characterized in that, The piston head body (1) has a connecting cavity (15) for installing the piston rod on one end face near the piston rod, and a number of mounting holes (16) are provided in the connecting cavity (15).

5. The piston sealing assembly according to claim 1, characterized in that, The piston head body (1) has an inwardly recessed cavity (17) on the end face away from the piston rod.

6. The piston sealing assembly according to claim 1, characterized in that, The scraper lip (11) is made of rubber.

7. The piston sealing assembly according to claim 1, characterized in that, The number of sealing grooves (12) and O-rings (2) is two.

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