Corrugated pipe sealing execution mechanism suitable for being used in ultralow-temperature environment
By using bellows seals and guide structures in the actuator, the problem of traditional sealing materials being prone to failure at low temperatures is solved, achieving sealing stability and safety, and making it suitable for ultra-low temperature environments.
Patent Information
- Application Number
- CN202423287779.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Traditional actuator sealing materials harden at low temperatures, have a short lifespan, and are prone to losing their sealing performance, leading to leaks and posing safety hazards.
A bellows seal is used instead of traditional sealing materials. The bellows is not affected by temperature. Combined with a return spring and guide structure, it ensures stable displacement of the push rod and piston. The sealing performance is guaranteed by the sealing ring between the cylinder block and cylinder head.
It maintains a stable and reliable seal in ultra-low temperature environments, preventing leaks and ensuring equipment safety. It has a compact structure and occupies little space.
Smart Images
Figure CN223498341U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of actuator technology, and in particular to a bellows-sealed actuator suitable for use in ultra-low temperature environments. Background Technology
[0002] Currently, many industrial sectors, such as petrochemicals, natural gas, and aerospace, require precise control and operation under ultra-low temperature conditions. Actuators are primarily used to drive valves, baffles, and other equipment to regulate parameters such as flow rate and pressure. For example, when transporting liquefied natural gas, the internal medium temperature is typically around -161.5℃. For equipment and systems operating in ultra-low temperature environments, safety is paramount. Actuators need reliable safety protection functions to prevent accidents. Traditional actuator sealing materials harden at low temperatures, have a short lifespan, and easily lose their sealing performance, leading to leaks and posing a significant safety hazard. Utility Model Content
[0003] The technical problem to be solved by this utility model is: in order to solve the problem that traditional actuator sealing materials harden at low temperatures, have short lifespans, easily lose sealing performance, and cause leakage, which is very unsafe, a bellows-sealed actuator suitable for use in ultra-low temperature environments is provided.
[0004] The technical solution adopted by this utility model to solve its technical problem is: a bellows-sealed actuator suitable for use in ultra-low temperature environments, including a cylinder body, a cylinder head, and a push rod, and also including a bellows and a piston. The cylinder head is placed on the cylinder body, and the bellows and piston are both disposed inside the cylinder head. One end of the bellows is fixed to the cylinder body, and the other end of the bellows is fixed to the piston. A closed pressure chamber is formed between the cylinder head, the cylinder body, the bellows, and the piston. The cylinder head is provided with a first through hole communicating with the pressure chamber. The cylinder body is provided with a first guide hole, which matches the push rod. One end of the push rod is fixed to the piston, and the other end of the push rod passes through the first guide hole and protrudes out of the cylinder body. A return spring is provided between the push rod and the cylinder body.
[0005] The push rod is provided with a limiting shoulder, which is located between the first guide hole and the guide cover. One end of the return spring abuts against the limiting shoulder, and the other end of the return spring abuts against the end of the cylinder body located in the first guide hole.
[0006] Compared to existing technologies, this solution replaces the original sealing material with a bellows seal. The bellows is not affected by temperature, ensuring stable and reliable sealing of the equipment and ensuring that the actuator can be used in low-temperature environments.
[0007] In some preferred embodiments, a sealed cavity is formed between the cylinder, the bellows, and the piston, and a second through hole communicating with the sealed cavity is provided on the cylinder.
[0008] To ensure stable and reliable displacement of the piston and push rod, a second guide hole is provided in the sealing cavity. The second guide hole is located between the first guide hole and the piston, and the push rod is disposed in the second guide hole.
[0009] A guide cover is fixedly connected to the cylinder body, and a second guide hole is disposed on the guide cover. The guide cover is located between the first guide hole and the piston. The push rod is guided by both the first guide hole and the second guide hole simultaneously, ensuring stable and reliable push rod displacement, which in turn ensures stable and reliable piston displacement and ensures that the piston blocks the first through hole.
[0010] In some preferred embodiments, the cylinder body is provided with two opposing vertical plates inside the sealed cavity, the push rod is located between the two vertical plates, and the guide cover is fixed between the two vertical plates.
[0011] In some preferred embodiments, the vertical plate and the cylinder body are integrally formed.
[0012] To ensure the piston accurately seals the first through hole, in some preferred embodiments, the cylinder head is provided with a positioning groove for positioning the piston, one end of the piston is positioned within the positioning groove, and the first through hole is located within the positioning groove. By providing a positioning groove on the cylinder head, the positioning groove positions the piston, and the first through hole is located within the positioning groove, ensuring that the piston stably and reliably seals the first through hole.
[0013] To ensure the airtightness of the pressure chamber, in some preferred embodiments, a sealing ring is provided between the cylinder body and the cylinder head. By providing a sealing ring between the cylinder body and the cylinder head, the sealing ring ensures a stable and reliable seal between the cylinder body and the cylinder head, thus ensuring a stable and reliable seal of the pressure chamber.
[0014] To facilitate the installation of the actuator, in some preferred embodiments, a bracket is fixedly mounted on the cylinder body, and the bracket is located at the protruding end of the push rod. By providing a bracket on the cylinder body, the actuator can be mounted on a valve body or other mechanism.
[0015] The beneficial effects of this utility model are as follows: This utility model provides a bellows-sealed actuator suitable for use in ultra-low temperature environments. When in use, the original sealing material is replaced with a bellows seal. The bellows is not affected by temperature, ensuring stable and reliable sealing of the equipment. This ensures that the actuator can be used in low-temperature environments. All components of the actuator are set between the cylinder body and the cylinder head, resulting in a compact overall structure and small space occupation. This avoids the problems of traditional actuator sealing materials hardening at low temperatures, having a short lifespan, easily losing sealing performance, leading to leakage and safety hazards. Attached Figure Description
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 yes Figure 1 A magnified view of part A in the image.
[0019] In the diagram: 1. Cylinder block, 2. Cylinder head, 3. Push rod, 4. Bellows, 5. Piston, 6. Pressure chamber, 7. First through hole, 8. First guide hole, 9. Return spring, 10. Sealing chamber, 11. Second through hole, 12. Second guide hole, 13. Guide cover, 14. Limiting shoulder, 15. Positioning groove, 16. Sealing ring, 17. Bracket, 18. Vertical plate. Detailed Implementation
[0020] The present invention will be further described in detail below with reference to the embodiments:
[0021] This utility model is not limited to the following specific embodiments. Those skilled in the art can implement this utility model using various other specific embodiments based on the disclosed content. Any modifications or alterations to the design structure and concept of this utility model also fall within the protection scope of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other.
[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0024] Traditional actuators use O-rings or rubber diaphragms for sealing. In low-temperature environments, these materials shrink, hardening and becoming brittle, significantly reducing elasticity. This leads to smaller dimensions, lower sealing pressure, and compromised sealing performance, potentially causing leaks. Therefore, in applications such as medical, aerospace, or laboratory settings, when valves transport liquid nitrogen (temperatures typically around -196°C), and the ambient temperature of the actuator is generally between -196°C and -29°C, traditional actuators' O-rings must be used to ensure a proper seal in such environments. Figure 1-2 As shown, a bellows-sealed actuator suitable for use in cryogenic environments includes a cylinder body 1, a cylinder head 2, a push rod 3, a bellows 4, and a piston 5. The cylinder head 2 covers the cylinder body 1. The bellows 4 and piston 5 are both located inside the cylinder head 2. One end of the bellows 4 is welded and fixed to the cylinder body 1, and the other end of the bellows 4 is welded and fixed to the piston 5. A closed pressure chamber 6 is formed between the cylinder head 2, the cylinder body 1, the bellows 4, and the piston 5. The cylinder head 2 is provided with a first through hole 7 communicating with the pressure chamber 6. The cylinder body 1 is provided with a first guide hole 8, which matches the push rod 3. One end of the push rod 3 is welded and fixed to the piston 5, and the other end of the push rod 3 passes through the first guide hole 8 and protrudes outside the cylinder body 1. The other end of the push rod 3 is connected to a valve body for transmission. A return spring 9 is provided between the push rod 3 and the cylinder body 1. The return spring 9 is used to drive the piston 5 to always block the first through hole 7.
[0025] A sealed cavity 10 is formed between the cylinder body 1, the bellows 4, and the piston 5. A second through hole 11 communicating with the sealed cavity 10 is provided on the cylinder body 1. A second guide hole 12 is provided inside the sealed cavity 10. The second guide hole 12 is located between the first guide hole 8 and the piston 5. The push rod 3 is located inside the second guide hole 12. A guide cover 13 is fixedly connected to the cylinder body 1. The second guide hole 12 is located on the guide cover 13. The guide cover 13 is located between the first guide hole 8 and the piston 5.
[0026] The push rod 3 is provided with a limiting shoulder 14, which is located between the first guide hole 8 and the guide cover 13. One end of the return spring 9 abuts against the limiting shoulder 14, and the other end of the return spring 9 abuts against the end of the cylinder body 1 located in the first guide hole 8. The cylinder body 1 is located in the sealing cavity 10 and is provided with two opposing vertical plates 18. The push rod 3 is located between the two vertical plates 18, and the guide cover 13 is fixed between the two vertical plates 18. The vertical plates 18 and the cylinder body 1 are integrally formed by casting.
[0027] The cylinder head 2 is provided with a positioning groove 15 for positioning the piston 5. One end of the piston 5 is located in the positioning groove 15. The first through hole 7 is located in the positioning groove 15. A sealing ring 16 is provided between the cylinder body 1 and the cylinder head 2. The sealing ring 16 is made of metal graphite spiral wound gasket, such as stainless steel with graphite spiral wound gasket.
[0028] A bracket 17 is fixedly installed on the cylinder body 1. The bracket 17 is located at the protruding end of the push rod 3 and is fixed to the valve body by the bracket 17.
[0029] When installing the bellows-sealed actuator suitable for use in ultra-low temperature environments, the actuator is fixed to the valve body to be operated by the bracket 17, the other end of the push rod 3 is connected to the valve drive, and the first through hole 7 on the cylinder head 2 is connected to the external air source to complete the installation of the actuator.
[0030] In use, gas is supplied to the pressure chamber 6 by controlling an external gas source. The gas pushes the piston 5 and drives the push rod 3 to move. The gas enters the pressure chamber 6. The push rod 3 slides in the first guide hole 8 and the second guide hole 12 to ensure that the displacement of the push rod 3 is stable and reliable. It can also ensure that the displacement of the piston 5 is stable and reliable. In the initial state, the piston 5 can block the first through hole 7. At the same time, the bellows 4 contracts, the return spring 9 is compressed, and the gas in the sealing chamber 10 is discharged through the second through hole 11.
[0031] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.
Claims
1. A bellows-sealed actuator suitable for use in cryogenic environments, comprising a cylinder body (1), a cylinder head (2), and a push rod (3), characterized in that: It also includes a bellows (4) and a piston (5). The cylinder head (2) is placed on the cylinder body (1). The bellows (4) and the piston (5) are both placed inside the cylinder head (2). One end of the bellows (4) is fixed on the cylinder body (1), and the other end of the bellows (4) is fixed on the piston (5). A closed pressure chamber (6) is formed between the cylinder head (2), the cylinder body (1), the bellows (4), and the piston (5). The cylinder head (2) is provided with a first through hole (7) that communicates with the pressure chamber (6). The cylinder body (1) is provided with a first guide hole (8). The first guide hole (8) matches the push rod (3). One end of the push rod (3) is fixed on the piston (5), and the other end of the push rod (3) passes through the first guide hole (8) and protrudes out of the cylinder body (1). A return spring (9) is provided between the push rod (3) and the cylinder body (1). The push rod (3) is provided with a limiting shoulder (14), which is located between the first guide hole (8) and the guide cover (13). One end of the return spring (9) abuts against the limiting shoulder (14), and the other end of the return spring (9) abuts against the end of the cylinder (1) located in the first guide hole (8).
2. The bellows-sealed actuator suitable for use in cryogenic environments according to claim 1, characterized in that: A sealed cavity (10) is formed between the cylinder (1), the bellows (4) and the piston (5), and a second through hole (11) communicating with the sealed cavity (10) is provided on the cylinder (1).
3. The bellows-sealed actuator suitable for use in cryogenic environments according to claim 2, characterized in that: The sealing cavity (10) is provided with a second guide hole (12), which is located between the first guide hole (8) and the piston (5). The push rod (3) is provided in the second guide hole (12). A guide cover (13) is fixedly connected to the cylinder body (1), and the second guide hole (12) is disposed on the guide cover (13). The guide cover (13) is located between the first guide hole (8) and the piston (5).
4. The bellows-sealed actuator suitable for use in cryogenic environments according to claim 1, characterized in that: The cylinder body (1) is located in the sealed cavity (10) and has two opposing vertical plates (18). The push rod (3) is located between the two vertical plates (18), and the guide cover (13) is fixed between the two vertical plates (18).
5. A bellows-sealed actuator suitable for use in cryogenic environments according to claim 4, characterized in that: The vertical plate (18) and the cylinder body (1) are integrally formed.
6. A bellows-sealed actuator suitable for use in cryogenic environments according to claim 1, characterized in that: The cylinder head (2) is provided with a positioning groove (15) for positioning the piston (5), one end of the piston (5) is located in the positioning groove (15), and the first through hole (7) is located in the positioning groove (15).
7. A bellows-sealed actuator suitable for use in cryogenic environments according to claim 1, characterized in that: A sealing ring (16) is provided between the cylinder body (1) and the cylinder head (2).
8. A bellows-sealed actuator suitable for use in cryogenic environments according to claim 1, characterized in that: A bracket (17) is fixedly installed on the cylinder (1), and the bracket (17) is located at the protruding end of the push rod (3).