Self-exhaust piston and rubber sleeve

Abstract

The utility model provides a self-exhaust piston and a rubber sleeve, which comprise a piston body and a piston cover plate, and the piston cover plate is clamped at one end of the piston body; the piston body comprises a through exhaust hole, the piston cover plate comprises a sealing column, the sealing column extends into the exhaust hole, the exhaust hole allows the sealing column to move in the axial direction of the exhaust hole, and an air inlet is formed in the piston cover plate; in the first state, the sealing column seals the exhaust hole, and the air inlet is not communicated with the exhaust hole; in the second state, an exhaust gap exists between the sealing column and the exhaust hole, and the air inlet communicates with the exhaust hole. During press fitting, the sealing column can be jacked by the aid of the special pressure head, so that the self-exhaust piston is in a second state, redundant gas in the rubber sleeve enters the exhaust hole through the gas inlet to be exhausted in the press-in process of the self-exhaust piston, and after the self-exhaust piston is pressed into a designated position, the special pressure head retreats, the sealing column resets by the aid of elasticity of materials, and the exhaust hole is sealed. The self-exhaust piston is in the first state and is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of piston structure design, in particular to a self-exhaust piston and a rubber cylinder. Background Art

[0002] Currently, there are a large number of closed cylindrical containers on the market, such as rubber cartridges. The pistons used in rubber cartridges are all one-piece. When filling glue, a large amount of gas will remain in the rubber cartridge, making the amount of glue squeezed out of the piston body each time inconsistent, affecting the dispensing accuracy.

[0003] The existing Chinese patent application document with the announcement number CN209124286U discloses a piston for an exhaustable rubber cartridge, which relates to the technical field of rubber cartridge pistons and aims to solve the problem that the prior art is inconvenient to exhaust the air in the rubber cartridge and has low glue filling efficiency. The key points of its technical solution are as follows: it includes an exhaust piston, one end of the exhaust piston is provided with a piston head; the end of the exhaust piston away from the piston head is provided with an exhaust column, the end of the exhaust column away from the exhaust piston is provided with an exhaust groove, and the piston head is provided with an exhaust hole connected to the exhaust groove; the end of the exhaust piston close to the exhaust column is also provided with a mounting column, the end of the mounting column away from the exhaust piston is provided with a mounting groove, and the exhaust column is provided on the bottom wall of the mounting groove; a sealing plug for blocking the exhaust groove is movably provided in the mounting groove along the depth direction of the mounting groove.

[0004] When installing the piston for the ventable rubber cartridge in the prior art, it is necessary to first press the venting piston into the rubber cartridge and then press the sealing plug into the venting piston, which is inconvenient to operate and needs to be improved. Utility Model Content

[0005] In view of the defects in the prior art, the purpose of the utility model is to provide a self-exhaust piston and a rubber cylinder.

[0006] According to the utility model, a self-exhaust piston is provided, comprising a piston body and a piston cover plate, wherein the piston cover plate is clamped at one end of the piston body; the piston body comprises a through exhaust hole, the piston cover plate comprises a sealing column, the sealing column extends into the exhaust hole, the exhaust hole allows the sealing column to move axially along the exhaust hole, and an air inlet is arranged on the piston cover plate; in a first state, the sealing column seals the exhaust hole, and the air inlet is not connected to the exhaust hole; in a second state, there is an exhaust gap between the sealing column and the exhaust hole, and the air inlet is connected to the exhaust hole.

[0007] Preferably, the air inlet is arranged on the peripheral side of the piston cover plate; in the first state: the inner surface of the piston cover plate is in close contact and sealing with the lower surface of the piston body.

[0008] Preferably, the piston cover plate can produce elastic deformation, the sealing column is arranged in the middle of the piston cover plate, and a protrusion is arranged at the position where the sealing column is arranged on the piston cover plate.

[0009] Preferably, the piston body is provided with a first engaging groove engaged with the edge of the piston cover plate.

[0010] Preferably, the first engaging groove is in a contracted state from the opening to the bottom.

[0011] Preferably, a clamping ring is further provided on the inner wall of the piston cover plate, the clamping ring is provided on the peripheral side of the sealing column, and a second clamping groove matched with the clamping ring is provided on the piston body.

[0012] Preferably, an arc-shaped sealing surface is provided on the peripheral edge of the piston body.

[0013] Preferably, a sealing ring is provided in the exhaust hole; in a first state, the sealing column extends into the sealing ring and cooperates with the sealing ring to seal the exhaust hole; in a second state, the sealing column is separated from the sealing ring, and the exhaust hole is connected with the air inlet.

[0014] Preferably, a structural reinforcement rib is provided on a side of the piston body facing away from the piston cover plate.

[0015] According to the rubber cartridge provided by the utility model, the self-exhaust piston is pressed into the rubber cartridge from the bottom of the rubber cartridge.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model uses a special pressure head to support the sealing column, so that the self-exhaust piston is in the second state. During the process of pressing the self-exhaust piston, the excess gas in the rubber cylinder enters the exhaust hole through the air inlet and is discharged. When the self-exhaust piston is pressed into the specified position, the special pressure head withdraws to loosen the sealing column, and the sealing column is reset by the elasticity of the material to seal the exhaust hole. The self-exhaust piston is in the first state. Compared with the piston in the prior art, the exhaust step after the piston is pressed into the rubber cylinder is reduced, and the installation is convenient.

[0018] 2. The utility model helps to improve the sealing effect in the first state through the clamping cooperation between the piston cover plate and the first clamping groove, and the clamping cooperation between the clamping ring and the second clamping groove.

[0019] 3. The utility model uses a material with elastic deformation, so that the sealing column can be reset by means of the elasticity of the material after the press-fitting is completed, thereby simplifying the installation steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1This is a schematic diagram of the assembly structure of the piston body and the piston cover plate of the utility model;

[0022] Figure 2 This is an axial schematic diagram mainly showing the front structure of the piston cover plate of the utility model;

[0023] Figure 3 This is an axial schematic diagram mainly showing the back structure of the piston cover plate of the utility model;

[0024] Figure 4 This is a cross-sectional view mainly showing the overall structure of the piston body of the utility model;

[0025] Figure 5 The utility model mainly embodies another schematic diagram of the assembly structure of the piston body and the piston cover plate.

[0026] Reference numerals:

[0027] Piston body 1 Structural reinforcement rib 16

[0028] Exhaust hole 11 Piston cover 2

[0029] First clamping groove 12 Sealing column 21

[0030] Second clamping slot 13 Air inlet 22

[0031] Arc-shaped sealing surface 14 convex portion 23

[0032] Sealing ring 15 Snap ring 24 DETAILED DESCRIPTION

[0033] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 According to the utility model, a self-exhaust piston is provided, comprising a piston body 1 and a piston cover plate 2, wherein the piston cover plate 2 is clamped at one end of the piston body 1. The piston body 1 comprises a through exhaust hole 11, the piston cover plate 2 comprises a sealing column 21, the sealing column 21 extends into the exhaust hole 11, the exhaust hole 11 allows the sealing column 21 to move along the axial direction of the exhaust hole 11, and the piston cover plate 2 is provided with an air inlet 22.

[0035] The first state: the sealing column 21 seals the exhaust hole 11 , and the air inlet 22 is not connected to the exhaust hole 11 .

[0036] The second state: there is an exhaust gap between the sealing column 21 and the exhaust hole 11 , and the air inlet 22 is connected to the exhaust hole 11 .

[0037] The present application forms a self-exhaust structure through the cooperation of the piston body 1 and the piston cover plate 2. In the process of pressing the self-exhaust piston into the rubber cylinder, the sealing column 21 can be supported by a special pressure head to put the self-exhaust piston in the second state. In the process of pressing the self-exhaust piston into the rubber cylinder, the excess gas in the rubber cylinder enters the exhaust hole 11 through the air inlet 22 and is discharged. When the self-exhaust piston is pressed into the specified position, the special pressure head withdraws and releases the sealing column 21. The sealing column 21 is reset by the elasticity of the material to seal the exhaust hole 11, and the self-exhaust piston is in the first state. Compared with the piston in the prior art, the exhaust step after the piston is pressed into the rubber cylinder is reduced, and the installation is convenient.

[0038] Specifically, both the piston body 1 and the piston cover plate 2 can be made of plastic material, and the shapes of the piston body 1 and the piston cover plate 2 are approximately cylindrical. The air inlet 22 is arranged on the peripheral side of the piston cover plate 2, and in the first state: the inner surface of the piston cover plate 2 is sealed against the lower surface of the piston body 1. Thus, in the first state, the piston cover plate 2 can reliably seal the exhaust hole 11 on the piston body 1.

[0039] Furthermore, since the piston cover plate 2 is made of plastic, the piston cover plate 2 can produce elastic deformation, the sealing column 21 is arranged in the middle of the piston cover plate 2, and the position where the sealing column 21 is arranged on the piston cover plate 2 is provided with a protrusion 23, thereby ensuring that the sealing column 21 can be stably reset.

[0040] Furthermore, the piston body 1 is provided with a first clamping groove 12 which is clamped with the edge of the piston cover plate 2. On the one hand, the reliability of the connection between the piston body 1 and the piston cover plate 2 is ensured, and on the other hand, the clamping structure has a certain sealing effect to ensure the reliability of the sealing of the self-exhaust piston in the second state. Since the sealing column 21 is pressed, the piston cover plate 2 produces a certain deformation. In the second state, the air inlet 22 located at the peripheral edge of the piston cover plate 2 can be connected with the exhaust hole 11. The first clamping groove 12 is in a contracted state from the opening to the bottom. On the one hand, it is convenient for the clamping connection between the piston cover plate 2 and the piston body 1, and on the other hand, it is convenient for the gas to enter the air inlet 22.

[0041] The peripheral edge of the piston body 1 is provided with an arc-shaped sealing surface 14 to ensure the reliability of the seal at the connection between the self-exhaust piston and the rubber cylinder. The side of the piston body 1 away from the piston cover plate 2 is provided with a structural reinforcement rib 16, which can improve the structural strength of the piston body 1 itself and reduce the overall mass of the self-exhaust piston.

[0042] In a feasible embodiment of the present application, a clamping ring 24 is further provided on the inner wall of the piston cover plate 2, and the clamping ring 24 is provided on the peripheral side of the sealing column 21, and a second clamping groove 13 adapted to the clamping ring 24 is provided on the piston body 1. A sealing ring 15 is provided in the exhaust hole 11; in the first state: the sealing column 21 extends into the sealing ring 15 and cooperates with the sealing ring 15 to seal the exhaust hole 11; in the second state: the sealing column 21 is separated from the sealing ring 15, the sealing column 21 is separated from the sealing ring 15, and the exhaust hole 11 is connected with the air inlet 22. The sealing effect of the exhaust hole 11 by the sealing cover plate in the first state can be further improved.

[0043] According to the rubber cylinder provided by the utility model, the self-exhaust piston is pressed into the rubber cylinder from the bottom of the rubber cylinder.

[0044] It should be noted that the present application does not specifically limit the size of the self-exhaust piston, and all improvements to the self-exhaust piston based on the present application fall within the protection scope of the present application. It should be further noted that the technical solution of the present application can also be used for packaging tubes for high-viscosity fluids such as toothpaste tubes.

[0045] How it works

[0046] The self-exhaust structure formed by the cooperation of the piston body 1 and the piston cover plate 2, when the self-exhaust piston is pressed into the rubber cylinder, the sealing column 21 is supported by a special pressure head, so that the sealing column 21 is disengaged from the exhaust hole 11, and the self-exhaust piston is in the second state. During the process of pressing the self-exhaust piston, the excess gas in the rubber cylinder enters the exhaust hole 11 through the air inlet 22 and is discharged. When the self-exhaust piston is pressed into the specified position, the special pressure head withdraws and releases the sealing column 21, and the sealing column 21 is reset by the elasticity of the material, and the sealing column 21 enters the exhaust hole 11 to seal the exhaust hole 11. The self-exhaust piston is in the first state, realizing the sealing of the bottom of the rubber cylinder.

[0047] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A self-exhausting piston, characterized in that: It comprises a piston body (1) and a piston cover plate (2), wherein the piston cover plate (2) is clamped on one end of the piston body (1); The piston body (1) comprises a through exhaust hole (11), the piston cover plate (2) comprises a sealing column (21), the sealing column (21) extends into the exhaust hole (11), the exhaust hole (11) allows the sealing column (21) to move along the axial direction of the exhaust hole (11), and the piston cover plate (2) is provided with an air inlet (22); The first state: the sealing column (21) seals the exhaust hole (11), and the air inlet (22) is not connected to the exhaust hole (11); Second state: an exhaust gap exists between the sealing column (21) and the exhaust hole (11), and the air inlet (22) is in communication with the exhaust hole (11).

2. The self-exhausting piston according to claim 1, characterized in that The air inlet (22) is arranged on the peripheral side of the piston cover plate (2); First state: the inner surface of the piston cover plate (2) is in close contact and sealing relationship with the lower surface of the piston body (1).

3. The self-exhausting piston according to claim 1, characterized in that The piston cover plate (2) can generate elastic deformation, the sealing column (21) is arranged in the middle of the piston cover plate (2), and a protrusion (23) is arranged at the position where the sealing column (21) is arranged on the piston cover plate (2).

4. The self-exhausting piston according to claim 1, wherein: The piston body (1) is provided with a first engaging groove (12) engaged with the edge of the piston cover plate (2).

5. The self-exhausting piston according to claim 4, characterized in that The first clamping groove (12) is in a contracted state from the opening to the bottom.

6. The self-exhausting piston according to claim 1, wherein: A clamping ring (24) is also provided on the inner wall of the piston cover plate (2), and the clamping ring (24) is arranged on the peripheral side of the sealing column (21). A second clamping groove (13) adapted to the clamping ring (24) is provided on the piston body (1).

7. The self-exhausting piston according to claim 1, wherein: An arc-shaped sealing surface (14) is provided on the peripheral edge of the piston body (1).

8. The self-exhausting piston according to claim 1, wherein: A sealing ring (15) is arranged in the exhaust hole (11); First state: the sealing column (21) extends into the sealing ring (15) and cooperates with the sealing ring (15) to seal the exhaust hole (11); Second state: the sealing column (21) is separated from the sealing ring (15), the sealing column (21) is separated from the sealing ring (15), and the exhaust hole (11) is connected to the air inlet (22).

9. The self-exhausting piston according to claim 1, wherein: A structural reinforcement rib (16) is provided on the side of the piston body (1) facing away from the piston cover plate (2).

10. A rubber cartridge, characterized in that: The self-exhaust piston according to any one of claims 1 to 9 is used, and the self-exhaust piston is pressed into the rubber cylinder from the bottom of the rubber cylinder.

Images