Anti-freezing low-temperature pressure regulating valve

Abstract

The utility model belongs to the technical field of valves, and relates to an anti-freezing low-temperature pressure regulating valve which comprises a pressure regulating valve body, an air hole formed in the pressure regulating valve body and an anti-freezing device arranged at the air hole, the anti-freezing device comprises an air bag, the air bag is filled with dry air, and the air bag is connected with the air hole. The air bag is communicated with the air hole through a connecting pipe, and a protective shell is arranged on the outer side of the air bag. The pressure regulating valve body directly exchanges with clean and dry air in the air bag in the working process, dust and water vapor in the air can be prevented from entering the pressure regulating valve body, and therefore the water vapor in the air is prevented from being condensed into ice in the low-temperature environment, the interior of the pressure regulating valve body is prevented from being frozen, and normal work of the pressure regulating valve is not affected.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a cryogenic pressure regulating valve that is resistant to freezing. Background Technology

[0002] Cryogenic pressure regulating valves are mainly used on cryogenic storage tanks and LNG vehicle cylinders. As automatic valves controlling the pressure increase of the tank or cylinder, they automatically close when the pressure reaches the set pressure. This is to maintain the tank or cylinder at its optimal operating pressure. When the air humidity is high, external moisture can seep into the pressure regulating valve, causing the valve diaphragm to freeze and preventing it from closing automatically. This results in a continuous increase in pressure in the tank or cylinder, forcing the gas stored in the cylinder to be released through the safety valve, causing economic losses for the user.

[0003] Patent No. CN202120967781.7 discloses a pressure regulating valve for preventing freezing at low temperatures. The valve includes a valve body with a valve cover. A countersunk hole is formed at the upper end of the valve cover, and a waterproof and breathable membrane is disposed within the countersunk hole. A pressure block is embedded within the countersunk hole, fixing the waterproof and breathable membrane. A striking rivet is provided between the pressure block and the valve cover. The valve body also includes a valve seat connected to the valve cover, with a diaphragm at the connection point. A spring is disposed within the valve cover, and a pad is disposed below the spring. The upper surface of the pad has an annular groove for accommodating the spring, and the lower surface of the pad is arc-shaped, abutting against the diaphragm. This invention prevents moisture from entering the valve cover chamber by using a waterproof and breathable membrane within the countersunk hole, thus preventing moisture from freezing the diaphragm. After long-term use, the waterproof and breathable membrane loses its waterproof performance and needs to be replaced regularly, which is cumbersome. In addition, the countersunk holes on the valve cover are easily blocked by dust and impurities in the air, affecting the breathability. Therefore, this utility model proposes a freeze-proof low-temperature pressure regulating valve. Utility Model Content

[0004] The main purpose of this utility model is to provide a low-temperature pressure regulating valve that is resistant to freezing, which solves the problems in the above-mentioned background technology that the waterproof and breathable membrane needs to be replaced regularly and the countersunk hole is easy to be blocked.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a low-temperature pressure regulating valve for preventing freezing, comprising a pressure regulating valve body, an air hole provided on the pressure regulating valve body, and an anti-freezing device provided at the air hole. The anti-freezing device includes an air bag filled with dry air. The air bag is connected to the air hole through a connecting pipe, and a protective shell is provided on the outside of the air bag.

[0006] Preferably, the protective shell includes a cylindrical outer shell with one end open, the outer shell is fitted onto the airbag, foam is filled between the outer shell and the airbag, a cover plate is connected to the opening of the outer shell, the cover plate has a through hole, the connecting pipe extends into the outer shell through the through hole, and the outer shell has an exhaust hole.

[0007] Preferably, the cover plate has wing plates perpendicular to its surface around its perimeter. The wing plates are attached to the outer peripheral surface of the outer shell. Both the wing plates and the outer shell have positioning holes on their peripheral surfaces. The wing plates and the outer shell are fixed together by bolts.

[0008] Preferably, the airbag is provided with a connector, and the two ends of the connecting tube are threaded and respectively threaded to the air hole and the connector.

[0009] Preferably, the connector has a clamping ring on its outer periphery, and the connecting pipe has a clamping block on its outer periphery near the connector, with the cover plate clamped between the clamping ring and the clamping block.

[0010] The beneficial effects of this utility model are: the air bladder stores dry air, and the pressure regulating valve body directly exchanges with the dry air in the air bladder during operation, preventing water vapor in the outside air from entering the pressure regulating valve body, thereby preventing water vapor in the air from condensing into ice in low-temperature environments and freezing the pressure regulating valve body, thus affecting the normal operation of the pressure regulating valve. Attached Figure Description

[0011] Figure 1 This is a diagram showing the arrangement of the cryogenic pressure regulating valve for freeze protection during operation, as illustrated in the example.

[0012] Figure 2 This is a schematic diagram of the airbag structure.

[0013] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0014] The numbers in the diagram represent:

[0015] 1. Pressure regulating valve body; 2. Air bladder; 3. Connecting pipe; 4. Protective shell; 5. Outer shell; 6. Cover plate; 7. Exhaust port; 8. Wing plate; 9. Positioning hole; 10. Connector; 11. Clamping ring; 12. Clamping block. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments.

[0017] Example:

[0018] like Figure 1 and Figure 2As shown, the present invention provides a cryogenic pressure regulating valve for preventing freezing, comprising a pressure regulating valve body 1, an air hole provided on the pressure regulating valve body 1, and an antifreezing device provided at the air hole. The antifreezing device includes an air bag 2, which is filled with dry air. The air bag 2 is connected to the air hole through a connecting pipe 3, and a protective shell 4 is provided on the outside of the air bag 2.

[0019] The protective shell 4 includes a cylindrical outer shell 5 with one end open. The outer shell 5 is fitted onto the airbag 2. Foam is filled between the outer shell 5 and the airbag 2. A cover plate 5 is connected to the opening of the outer shell 5. The cover plate 5 has a through hole. The connecting pipe 3 extends into the outer shell 5 through the through hole. The outer shell 5 has an exhaust hole 7.

[0020] The cover plate 5 has wing plates 8 perpendicular to its surface around its perimeter. The wing plates 8 are attached to the outer peripheral surface of the outer shell 5. Both the wing plates 8 and the outer shell 5 have positioning holes 9 on their peripheral surfaces. The wing plates 8 and the outer shell 5 are fixed together by bolts.

[0021] The airbag 2 is provided with a connector 10, and the two ends of the connecting tube 3 are threaded and respectively connected to the air hole and the connector 10.

[0022] The connector 10 is provided with a clamping ring 11 on its outer periphery, and the connecting pipe 3 is provided with a clamping block 12 on its outer periphery near the connector 10. The cover plate 5 is clamped between the clamping ring 11 and the clamping block 12, thereby fixing the cover plate 5 to the connecting pipe 3.

[0023] The air bladder 2 stores dry air, and the pressure regulating valve body 1 directly exchanges with the clean and dry air in the air bladder 2 during operation. This prevents dust and moisture in the air from entering the pressure regulating valve body 1, thereby preventing moisture in the air from condensing into ice in low-temperature environments and freezing the inside of the pressure regulating valve body 1, which would affect the normal operation of the pressure regulating valve.

[0024] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A freeze-proof cryogenic pressure regulating valve, characterized by: The pressure regulating valve body, the air hole and the anti-freezing device, the anti-freezing device comprises an air bag, the air bag is filled with dry air, the air bag is communicated with the air hole through a connecting pipe, the outer side of the air bag is provided with a protective shell.

2. A freeze-proof cryogenic pressure regulating valve according to claim 1, characterized in that: The protective shell comprises a cylindrical shell with one end open, the shell is sleeved on the air bag, the shell and the air bag are filled with foam, the open end of the shell is connected with a cover plate, the cover plate is provided with a through hole, the connecting pipe extends into the shell through the through hole, and the shell is provided with an exhaust hole.

3. A freeze-proof cryogenic pressure regulating valve according to claim 2, characterized in that: The periphery of the cover plate is provided with a wing plate perpendicular to the plate surface, the wing plate is attached to the outer peripheral surface of the shell, the wing plate and the peripheral surface of the shell are both provided with positioning holes, and the wing plate and the shell are fixed through bolts.

4. A freeze-proof cryogenic pressure regulating valve according to claim 2, wherein: The air bag is provided with a connector, and the two ends of the connecting pipe are threaded and respectively screwed with the air hole and the connector.

5. A freeze-proof cryogenic pressure regulating valve according to claim 4, wherein: The outer periphery of the connector is provided with a clamping ring, the outer periphery of the connecting pipe is provided with a clamping block on one side close to the connector, and the cover plate is clamped between the clamping ring and the clamping block.

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