Long-acting lubrication sealing device of pneumatic actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, and discloses a long-acting lubrication sealing device of a pneumatic actuator, which comprises a pneumatic actuator body, a lubrication structure and a sealing assembly, the pneumatic actuator body comprises an air cylinder, a piston and a piston rod, the air cylinder is of a cylindrical structure, the inner wall is smooth, and the air cylinder is used for accommodating the piston and the piston rod; the piston is tightly matched with the inner wall of the air cylinder, one end of the piston rod is fixed to the piston, the other end of the piston rod extends out of the air cylinder and is used for being connected with an external executing mechanism, and uniform seepage and long-acting lubrication of lubricating oil are achieved through a built-in lubricating system which comprises an oil storage cavity, a lubricating oil channel and a micropore permeable layer. The micropore permeable layer covers the surface of the piston to ensure that lubricating oil continuously covers the piston in the moving process, and friction loss is reduced. The pressure regulating valve and the one-way valve further control the seepage rate of the lubricating oil to avoid excess or insufficiency. By means of the design, the service life of the pneumatic actuator is remarkably prolonged, and the maintenance frequency and cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator technology, specifically a long-lasting lubrication and sealing device for pneumatic actuators. Background Technology

[0002] Pneumatic actuators are widely used in industrial automation. Their core components (such as pistons and seals) are prone to wear and leakage due to insufficient lubrication or seal failure during long-term operation, affecting equipment performance and lifespan. Current technology typically involves periodically adding lubricating oil manually or replacing seals, but these methods have the following problems:

[0003] 1. High maintenance costs: Frequent downtime for maintenance affects production efficiency.

[0004] 2. Uneven lubrication: Manually adding lubricating oil makes it difficult to ensure even lubrication, which can easily cause localized wear.

[0005] 3. Poor sealing performance: Traditional sealing rings are prone to aging and failure under high temperature and high pressure environments.

[0006] Therefore, there is an urgent need for a long-lasting lubrication and sealing device for pneumatic actuators. Utility Model Content

[0007] The purpose of this invention is to provide a long-lasting lubrication and sealing device for pneumatic actuators to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a long-lasting lubrication and sealing device for a pneumatic actuator, comprising a pneumatic actuator body, a lubrication structure, and a sealing assembly.

[0009] The pneumatic actuator body includes a cylinder, a piston, and a piston rod. The cylinder is a cylindrical structure with a smooth inner wall, used to accommodate the piston and piston rod. The piston fits tightly with the inner wall of the cylinder. One end of the piston rod is fixed to the piston, and the other end extends out of the cylinder to connect to an external actuator.

[0010] The lubrication structure includes an oil storage chamber, a lubricating oil channel, and a microporous permeation layer. The oil storage chamber is located on the inner wall of the piston and is used to store lubricating oil. The lubricating oil channel connects the oil storage chamber and the microporous permeation layer (203) and is used to transport lubricating oil. The microporous permeation layer covers the piston surface and lubricating oil is uniformly seeped out through the micropores to achieve long-term lubrication.

[0011] The sealing assembly includes a main sealing ring, a secondary sealing ring, and an elastic support ring. The main sealing ring and the secondary sealing ring are located between the piston and the cylinder to prevent gas leakage. The elastic support ring is located inside the main sealing ring to enhance the fit of the sealing ring.

[0012] Preferably, the microporous permeable layer is made of porous ceramic material with a pore size of 10-50 micrometers.

[0013] Preferably, the oil storage chamber is equipped with a pressure regulating valve.

[0014] Preferably, the main sealing ring is made of fluororubber and the secondary sealing ring is made of polytetrafluoroethylene.

[0015] Preferably, the elastic support ring is made of spring steel.

[0016] Preferably, a one-way valve is provided in the lubricating oil passage.

[0017] Preferably, the inner wall of the cylinder is provided with a wear-resistant coating.

[0018] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0019] First, this invention achieves uniform lubrication and long-lasting lubrication through a built-in lubrication system, including an oil reservoir, lubricating oil channels, and a microporous permeation layer. The microporous permeation layer covers the piston surface, ensuring continuous lubrication during piston movement and reducing frictional losses. A pressure regulating valve and a check valve further control the lubricating oil seepage rate, preventing excessive or insufficient flow. This design significantly extends the service life of the pneumatic actuator and reduces maintenance frequency and costs.

[0020] Secondly, this utility model adopts a multi-layer sealing structure, including a main sealing ring, a secondary sealing ring, and an elastic support ring, to ensure the sealing performance of the pneumatic actuator under high temperature and high pressure environments. The main sealing ring is made of fluororubber, and the secondary sealing ring is made of polytetrafluoroethylene (PTFE), which is resistant to high temperatures and corrosion. The elastic support ring enhances the fit of the sealing ring. The sealing ring prevents external dust from entering, further extending the service life of the sealing components. This design effectively prevents gas leakage and improves the stability and reliability of equipment operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall internal structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the sealing component structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0024] Figure 4 For the present utility model Figure 3 Enlarged schematic diagram of the structure at point A.

[0025] The components include: 1. Pneumatic actuator body; 101. Cylinder; 102. Piston; 103. Piston rod; 104. Wear-resistant coating; 2. Lubrication structure; 201. Oil reservoir; 202. Lubricating oil channel; 203. Microporous permeable layer; 204. Pressure regulating valve; 205. Check valve; 3. Sealing assembly; 301. Main sealing ring; 302. Secondary sealing ring; 303. Elastic support ring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The specific implementation method is as follows: Figure 1-4 As shown, a long-term lubrication and sealing device for a pneumatic actuator includes a pneumatic actuator body 1, a lubrication structure 2, and a sealing assembly 3.

[0028] The pneumatic actuator body 1 includes a cylinder 101, a piston 102 and a piston rod 103. The cylinder 101 has a cylindrical structure with a smooth inner wall and is used to accommodate the piston 102 and the piston rod 103. The piston 102 is tightly fitted with the inner wall of the cylinder 101. One end of the piston rod 103 is fixed to the piston 102 and the other end extends out of the cylinder 101 to connect to an external actuator.

[0029] Lubrication structure 2 includes an oil storage chamber 201, a lubricating oil channel 202, and a microporous permeation layer 203. The oil storage chamber 201 is located on the inner wall of the piston 102 and is used to store lubricating oil. The lubricating oil channel 202 connects the oil storage chamber 201 and the microporous permeation layer 203 and is used to transport lubricating oil. The microporous permeation layer 203 covers the surface of the piston 102, and lubricating oil seeps out evenly from the micropores to achieve long-term lubrication.

[0030] The sealing assembly 3 includes a main sealing ring 301, a secondary sealing ring 302, and an elastic support ring 303. The main sealing ring 301 and the secondary sealing ring 302 are located between the piston 102 and the cylinder 101 to prevent gas leakage. The elastic support ring 303 is located inside the main sealing ring 301 to enhance the fit of the sealing ring.

[0031] Through the above technical solution, the built-in lubrication system 2, including an oil reservoir 201, a lubricating oil channel 202, and a microporous permeation layer 203, achieves uniform lubrication and long-term lubrication. The microporous permeation layer 203 covers the surface of the piston 102, ensuring continuous lubrication during piston movement and reducing frictional losses. The pressure regulating valve 204 and the one-way valve 205 further control the lubricating oil seepage rate, preventing excessive or insufficient lubrication. This design significantly extends the service life of the pneumatic actuator and reduces maintenance frequency and costs.

[0032] A multi-layer sealing structure, including a main sealing ring 301, a secondary sealing ring 302, and an elastic support ring 303, ensures the sealing performance of the pneumatic actuator under high temperature and high pressure environments. The main sealing ring 301 is made of fluororubber, and the secondary sealing ring 302 is made of polytetrafluoroethylene (PTFE), both of which are resistant to high temperatures and corrosion. The elastic support ring 303 enhances the fit of the sealing rings. The sealing ring 304 prevents external dust from entering, further extending the service life of the sealing assembly 3. This design effectively prevents gas leakage and improves the stability and reliability of equipment operation.

[0033] Specifically, the microporous permeable layer 203 is made of porous ceramic material with a pore size of 10-50 micrometers.

[0034] Through the above technical solutions, porous ceramic materials possess high hardness, wear resistance, and high temperature resistance, making them suitable for the high-pressure and high-temperature working environments of pneumatic actuators. Pore size design: The pore size is 10-50 micrometers, ensuring uniform lubricant seepage while preventing excessive seepage and waste. Micropore distribution: Micropores are evenly distributed on the surface of piston 102, ensuring extensive lubricant coverage and reducing localized wear.

[0035] Specifically, a pressure regulating valve 204 is provided inside the oil storage chamber 201.

[0036] Through the above technical solution, the pressure regulating valve 204 is used to control the lubricating oil pressure in the oil reservoir 201, ensuring that the lubricating oil is delivered to the microporous permeation layer 203 at a constant rate through the lubricating oil channel 202. The pressure regulating valve 204 can automatically adjust the lubricating oil seepage rate according to the working status of the pneumatic actuator, such as pressure and temperature, to ensure optimal lubrication. The pressure regulating valve 204 is located at the outlet of the oil reservoir 201 for easy maintenance and replacement.

[0037] Specifically, the main sealing ring 301 is made of fluororubber, and the secondary sealing ring 302 is made of polytetrafluoroethylene.

[0038] Through the above technical solution, the main sealing ring 301 is made of fluororubber, which has excellent high-temperature resistance and corrosion resistance, making it suitable for the high-pressure and high-temperature working environment of pneumatic actuators. The secondary sealing ring 302 is made of polytetrafluoroethylene, which has a low coefficient of friction and self-lubricating properties, further reducing frictional losses between the piston 102 and the cylinder 101. The main sealing ring 301 and the secondary sealing ring 302 work together to ensure the sealing performance of the pneumatic actuator under extreme operating conditions.

[0039] Specifically, the elastic support ring 303 is made of spring steel.

[0040] Through the above technical solution, the elastic support ring 303 is made of spring steel, which has high elasticity and fatigue resistance, ensuring that the main sealing ring 301 fits tightly against the inner wall of the cylinder 101. The elastic support ring 303 has a ring structure, with its inner side contacting the main sealing ring 301 and its outer side contacting the secondary sealing ring 302, providing uniform support force. The elastic support ring 303 is fixed between the main sealing ring 301 and the secondary sealing ring 302 by snap-fit ​​or adhesive bonding, facilitating installation and replacement.

[0041] Specifically, a one-way valve 205 is provided in the lubricating oil passage 202.

[0042] Through the above technical solution, the one-way valve 205 is used to prevent lubricating oil backflow, ensuring that lubricating oil can only flow from the oil reservoir 201 to the microporous permeation layer 203. When the lubricating oil pressure reaches the set value, the one-way valve 205 automatically opens, and the lubricating oil is delivered to the microporous permeation layer 203 through the lubricating oil channel 202; when the pressure decreases, the one-way valve 205 automatically closes to prevent lubricating oil backflow. The one-way valve 205 is located in the middle section of the lubricating oil channel 202.

[0043] Specifically, the inner wall of cylinder 101 is provided with a wear-resistant coating 104.

[0044] Through the above technical solution, the wear-resistant coating 104 is made of a high-hardness material such as tungsten carbide or silicon nitride and is coated on the inner wall of the cylinder 101 to reduce frictional loss during piston 102 movement. The thickness of the wear-resistant coating 104 is 0.1-0.3 mm to ensure uniform coating and not affecting the inner diameter of the cylinder 101. The wear-resistant coating 104 is applied to the cylinder 101 using thermal spraying or electroplating processes to ensure a strong bond between the coating and the substrate.

[0045] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these specific embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A long-term lubrication and sealing device for a pneumatic actuator, comprising a pneumatic actuator body (1), a lubrication structure (2), and a sealing assembly (3), characterized in that: The pneumatic actuator body (1) includes a cylinder (101), a piston (102) and a piston rod (103). The cylinder (101) has a cylindrical structure with a smooth inner wall and is used to accommodate the piston (102) and the piston rod (103). The piston (102) is tightly fitted to the inner wall of the cylinder (101). One end of the piston rod (103) is fixed to the piston (102), and the other end extends out of the cylinder (101) to connect to an external actuator. The lubrication structure (2) includes an oil storage chamber (201), a lubricating oil channel (202), and a microporous permeation layer (203). The oil storage chamber (201) is located on the inner wall of the piston (102) and is used to store lubricating oil. The lubricating oil channel (202) connects the oil storage chamber (201) and the microporous permeation layer (203) and is used to transport lubricating oil. The microporous permeation layer (203) covers the surface of the piston (102) and lubricating oil is uniformly permeated through the micropores to achieve long-term lubrication. The sealing assembly (3) includes a main sealing ring (301), a secondary sealing ring (302), and an elastic support ring (303). The main sealing ring (301) and the secondary sealing ring (302) are located between the piston (102) and the cylinder (101) to prevent gas leakage. The elastic support ring (303) is located inside the main sealing ring (301) to enhance the fit of the sealing ring.

2. A long-life lubricated seal for a pneumatic actuator as defined in claim 1, wherein: The microporous permeable layer (203) is made of porous ceramic material with a pore size of 10-50 micrometers.

3. A long-life lubricated seal for a pneumatic actuator as defined in claim 1, wherein: The oil storage chamber (201) is equipped with a pressure regulating valve (204).

4. A long-life lubricated seal for a pneumatic actuator as defined in claim 1, wherein: The main sealing ring (301) is made of fluororubber, and the secondary sealing ring (302) is made of polytetrafluoroethylene.

5. A long-life lubricated seal for a pneumatic actuator as defined in claim 1, wherein: The elastic support ring (303) is made of spring steel.

6. A long-life lubricated seal for a pneumatic actuator as defined in claim 1 wherein: A one-way valve (205) is provided in the lubricating oil passage (202).

7. A long-life lubricated seal for a pneumatic actuator as defined in claim 1 wherein: The inner wall of the cylinder (101) is provided with a wear-resistant coating (104).

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