Low-temperature precision pressure regulating valve

Abstract

This application discloses a cryogenic precision pressure regulating valve, belonging to the field of valve technology. It mainly includes a valve body with a mounting portion, an actuating assembly on the valve body, the actuating assembly having a valve cover, a valve stem, and a valve core, and a protective assembly on the valve body. The protective assembly includes a gasket installed at the bottom of the valve cover, located between the mounting portion and the valve cover. A bellows is provided at the bottom of the gasket, sleeved on the valve stem. A base plate is provided at the bottom of the bellows, connected to the top of the valve core. At least two sets of guide rods are installed on the base plate, slidably disposed on the valve body and valve cover. This cryogenic precision pressure regulating valve, through the protective assembly, reduces fluid wear on the valve stem by having the bellows sleeved on it during fluid transport, thus preventing direct contact between the valve stem and the fluid.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a cryogenic precision pressure regulating valve. Background Technology

[0002] A precision pressure regulating valve is a high-precision, high-stability fluid control device specifically designed to precisely regulate and stabilize high-pressure fluids (gas or liquid) at a set pressure value. Its core function is to automatically adjust the valve opening via a mechanical structure, achieving precise control and long-term stability of the output pressure, meeting the stringent pressure control requirements of industrial automation, analytical instruments, energy systems, and other fields.

[0003] For example, patent CN214248431 U discloses a precision pressure regulating valve. This valve compresses a first elastic element by rotating an adjusting screw, thereby applying pressure to a diaphragm. The pressure is then transmitted to a second elastic element through a pin and a needle seat. The second elastic element is compressed, and the needle seat moves the sealing element downward, creating a gap between the needle seat and the nozzle. The input gas flows through the gap between the needle seat and the nozzle, and then through the gap between the pin and the nozzle into the lower chamber of the diaphragm. The output gas pressure changes, and the gas entering the lower chamber exerts a force on the diaphragm, bringing the entire system to equilibrium. At this point, the gas output pressure is the required output pressure. When the input pressure changes, the force acting on the lower chamber of the diaphragm also changes accordingly, causing the diaphragm to move up and down. The pin and needle seat move up and down accordingly, changing the size of the gap between the needle seat and the nozzle, so that the entire system reaches a new equilibrium, and the output pressure is stabilized within the specified range, thereby achieving the purpose of automatic control and pressure stabilization.

[0004] Although the above-mentioned patent can achieve pressure regulation, when the valve is open, the fluid is always in direct contact with the needle seat during the fluid transmission process. Impurities in the fluid (such as particles and dust) or the corrosiveness of the fluid itself may cause wear or bending of the needle seat surface over a long period of time, which may lead to a decrease in sealing performance, leakage, or reduced pressure control accuracy.

[0005] Therefore, it is necessary to provide a low-temperature precision pressure regulating valve to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a low-temperature precision pressure regulating valve that avoids direct contact between the valve stem and the fluid.

[0008] The technical solution adopted by this application to solve its technical problem is as follows: a low-temperature precision pressure regulating valve, including a valve body with a mounting part; an actuating component disposed on the valve body, the actuating component having a valve cover suitable for sealing, a valve stem suitable for movement, and a valve core; a protective component disposed on the valve body, the protective component including: a gasket, the gasket being installed at the bottom of the valve cover, the gasket being located between the mounting part and the valve cover; a bellows, the bellows being disposed at the bottom of the gasket, the bellows being sleeved on the valve stem; a base plate, the base plate being disposed at the bottom of the bellows, the base plate being connected to the top of the valve core; and at least two sets of guide rods, the guide rods being installed on the base plate, the guide rods being slidably disposed on the valve body and the valve cover.

[0009] Furthermore, a channel is provided through the valve body, and a base is provided inside the valve body. The base is located inside the channel, and a through hole is provided through the base. The pad is made of elastic material.

[0010] Furthermore, a support frame is installed on the top of the valve cover, and the valve stem is slidably mounted on the support frame, valve cover, and valve body.

[0011] Furthermore, an equipment box is installed on the top of the support frame, and a sealed cavity is opened inside the equipment box, with a diaphragm slidingly disposed inside the sealed cavity.

[0012] Furthermore, a spring is provided between the top of the diaphragm and the inner wall of the sealing cavity, and a vertical rod is installed at the bottom of the diaphragm, with a marker block at the bottom end of the vertical rod.

[0013] Furthermore, the standard block is threadedly connected to the valve stem, and an air pipe is installed inside the equipment box, with one end of the air pipe extending into the sealed cavity and located below the diaphragm.

[0014] The beneficial effects of this application are: the low-temperature precision pressure regulating valve provided by this application, through the setting of protective components, allows the bellows to be sleeved on the valve stem when conveying fluid, so as to reduce the wear of the valve stem by the fluid and achieve the effect of avoiding direct contact between the valve stem and the fluid.

[0015] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0017] In the attached diagram:

[0018] Figure 1 This is an overall schematic diagram of a cryogenic precision pressure regulating valve according to this application;

[0019] Figure 2 for Figure 1 A cross-sectional view of the entire structure;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] The following are the labeling elements in the figure:

[0022] 1. Valve body; 101. Channel; 102. Mounting part; 103. Inlet chamber; 104. Outlet chamber;

[0023] 2. Actuating components; 21. Equipment box; 22. Air pipe; 23. Support frame; 24. Vertical rod; 25. Valve cover; 26. Valve core; 261. Base; 27. Spring; 28. Diaphragm; 29. ​​Valve stem;

[0024] 3. Protective components; 31. Pad; 32. Corrugated pipe; 33. Guide rod; 34. Base plate. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] like Figures 1-2 As shown, this application provides a low-temperature precision pressure regulating valve, which is mainly used to achieve high-precision and high-stability pressure regulation in low-temperature environments. It includes a valve body 1 and a mounting part 102. The valve body 1 has a channel 101 suitable for fluid passage, and flanges are provided at both ends of the valve body 1 to facilitate connection with the pipeline for conveying fluid.

[0028] An actuator 2 is provided on the valve body 1. This actuator 2 is used to open and close the channel 101, specifically:

[0029] The actuator 2 includes a valve cover 25 fixedly mounted on the mounting part 102. A support frame 23 is fixedly mounted on the top of the valve cover 25. A valve stem 29 is slidably disposed inside the support frame 23, the valve cover 25, and the valve body 1. A valve core 26 is fixedly mounted on the bottom of the valve stem 29. Figure 3 );

[0030] A base 261 is provided inside the valve body 1 to divide the channel 101 into an inlet chamber 103 suitable for fluid entry and an outlet chamber 104 suitable for fluid exit, and a through hole adapted to the valve core 26 is provided through the base 261.

[0031] In the initial state, the valve core 26 is located inside the through hole to block the through hole, thereby closing the channel 101. Under the action of external force, the valve stem 29 can be driven to move upward, thereby driving the valve core 26 to move upward, thereby connecting the inlet chamber 103 and the outlet chamber 104 to open the channel 101.

[0032] The top of the support frame 23 is fixedly installed with an equipment box 21. The equipment box 21 has a sealed cavity inside. A diaphragm 28 is slidably arranged inside the sealed cavity. A spring 27 is arranged between the top of the diaphragm 28 and the inner wall of the sealed cavity.

[0033] A vertical rod 24 is fixedly installed at the bottom of the diaphragm 28. The bottom end of the vertical rod 24 has a marker block, which is threadedly connected to the valve stem 29. An air pipe 22 is provided inside the equipment box 21. One end of the air pipe 22 extends into the interior of the sealing cavity and is located below the diaphragm 28, so that the other end of the air pipe 22 can be connected to the pipeline for conveying fluid.

[0034] When conveying fluid, the fluid first enters the inlet chamber 103. At this time, due to the valve closing the through hole, some fluid will enter the equipment box 21 through the air pipe 22, thereby pushing the diaphragm 28 to move upward. At this time, the spring 27 will be compressed and drive the valve stem 29 to move upward through the vertical rod 24 and the standard block, thereby driving the valve core 26 to move. At this time, the inlet chamber 103 and the outlet chamber 104 are connected, and the fluid enters the outlet chamber 104 through the through hole and is discharged.

[0035] When the fluid pressure in the pipeline that delivers the fluid changes, the pressure on the diaphragm 28 will change synchronously, which in turn drives the valve core 26 to move, thereby changing the gap between the valve core 26 and the through hole to adapt to the change in fluid pressure.

[0036] It should be noted that a scale can also be set on the support frame 23, and the scale block can be aligned with the scale to facilitate observation of the distance the valve core 26 moves. When the valve core 26 is worn, that is, when there is a gap between the initial position of the valve core 26 and the through hole, the valve rod 29 can be rotated to drive the valve core 26 to move downward until the through hole is blocked again.

[0037] A protective component 3 is provided on the valve body 1 to prevent the valve stem 29 from direct contact with the fluid.

[0038] like Figures 1-3 As shown, the protective component 3 includes a pad 31 installed at the bottom of the valve cover 25. The pad 31 can be made of an elastic material, so that when the valve cover 25 is installed, the pad 31 contacts the mounting part 102, avoiding direct contact between the valve cover 25 and the valve body 1. This reduces the vibration of the valve body 1 on the valve cover 25 during fluid transportation, reduces the wear of the threads at the connection between the valve stem 29 and the standard block, and extends the service life.

[0039] A bellows 32 is provided at the bottom of the pad 31. The bellows 32 is sleeved on the valve stem 29 and located inside the inlet cavity 103. The diameter of the bellows 32 is larger than the diameter of the valve stem 29. This avoids direct contact between the valve stem 29 and the fluid during fluid transportation, thereby reducing the wear of the valve stem 29 by the fluid and further reducing the vibration caused by the impact of the fluid on the valve stem 29. It also further avoids the wear of the threads at the connection between the valve stem 29 and the standard block.

[0040] A base plate 34 is provided at the bottom of the bellows 32. The base plate 34 is mounted on the valve core 26, so that when the valve core 26 moves, the bellows 32 can be compressed to avoid interference with its movement.

[0041] Multiple sets of guide rods 33 are provided on the base plate 34. The guide rods slide through the valve body 1 and the valve cover 25, so that when the valve core 26 compresses the bellows 32, the bellows 32 can be guided. At the same time, the bellows 32 can be prevented from being impacted by the fluid and causing a large displacement. It can also further disperse the fluid entering the inlet chamber 103.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cryogenic precision pressure regulating valve characterized by: include: Valve body (1), on which a mounting part (102) is provided; An actuator (2) is disposed on the valve body (1) and has a valve cover (25) suitable for sealing, a valve stem (29) suitable for movement, and a valve core (26). A protective component (3) disposed on the valve body (1), the protective component (3) comprising: A pad (31) is installed at the bottom of the valve cover (25) and the pad (31) is located between the mounting part (102) and the valve cover (25); A bellows (32) is disposed at the bottom of the pad (31) and is sleeved on the valve stem (29); A base plate (34) is disposed at the bottom of the bellows (32) and is connected to the top of the valve core (26); At least two sets of guide rods (33) are mounted on the base plate (34) and are slidably disposed on the valve body (1) and the valve cover (25).

2. The cryogenic precision pressure regulating valve of claim 1, wherein: A channel (101) is provided through the valve body (1), and a base (261) is provided inside the valve body (1). The base (261) is located inside the channel (101), and a through hole is provided through the base (261). The pad (31) is made of elastic material.

3. A cryogenic precision pressure regulating valve according to claim 2, wherein: A support frame (23) is installed on the top of the valve cover (25), and the valve stem (29) is slidably disposed on the support frame (23), the valve cover (25) and the valve body (1).

4. A cryogenic precision pressure regulating valve according to claim 3, wherein: The top of the support frame (23) is equipped with an equipment box (21), and a sealed cavity is provided inside the equipment box (21), and a diaphragm (28) is slidably disposed inside the sealed cavity.

5. A cryogenic precision pressure regulating valve according to claim 4, wherein: A spring (27) is provided between the top of the diaphragm (28) and the inner wall of the sealing cavity. A vertical rod (24) is installed at the bottom of the diaphragm (28), and a marker block is provided at the bottom end of the vertical rod (24).

6. A low-temperature precision pressure regulating valve according to claim 5, characterized in that: The standard block is threadedly connected to the valve stem (29). An air pipe (22) is provided inside the device box (21). One end of the air pipe (22) extends into the interior of the sealing cavity and is located below the diaphragm (28).

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