A low-temperature combined pressure regulating valve

Abstract

The present invention discloses a low-temperature combined pressure regulating valve with a fast pressure boosting speed and pressure reducing function. The upper cover of the pressure regulating valve is connected to the valve body. The pressure regulating screw is screwed into the cavity of the upper cover from the top of the upper cover and presses against the top of the upper pressing block. The bottom of the upper pressing block presses against the upper end of the pressure regulating spring. The lower end of the pressure regulating spring presses against the top of the lower pressing block. The bottom of the lower pressing block presses against the diaphragm. The diaphragm is clamped between the upper cover and the valve body. A rear cover is provided at the bottom of the valve body. A return spring is provided between the rear cover and the lower valve flap. An upper valve seat with a sealing circle at the top is movably arranged in the upper valve cavity. The bottom of the upper valve seat is fixedly arranged in the groove at the top of the lower valve flap. A first through hole is provided in the middle of the upper valve seat. A second through hole communicating with the first through hole is provided on the side of the lower valve flap. The diaphragm and the sealing fillet can be in contact for sealing or can be separated and communicated. A sealing ring is provided between the lower valve flap and the inner wall of the valve body. This low-temperature combined pressure regulating valve has a reasonable structure, good sealing performance, and a fast pressure boosting speed.

Description

Technical Field

[0001] The present invention belongs to the technical field of cryogenic insulated gas cylinders, and particularly relates to a cryogenic combined pressure regulating valve. Background Art

[0002] Dewar bottles are usually equipped with cryogenic combined pressure regulating valves to stabilize the pressure of the Dewar bottles through the two major functions of pressurization and depressurization of the cryogenic combined pressure regulating valve. In the prior art, a cryogenic combined pressure regulating valve is disclosed in the invention patent with the application number CN 201520365075.X. By increasing the opening height of the lower valve flap, the initial pressurization speed of the Dewar bottle is accelerated. However, due to the gaps between the upper valve seat, the lower valve flap and the valve body, the sealing performance inside the pressure regulating valve is poor, and the initial pressurization speed of the Dewar bottle cannot be better accelerated. To solve the above technical problems, a cryogenic combined pressure regulating valve is provided. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a cryogenic combined pressure regulating valve, which can not only improve the sealing performance during the pressurization of the Dewar bottle, thereby accelerating the pressurization speed of the Dewar bottle, but also play a role in depressurization.

[0004] To achieve the above purpose, the following technical solutions are provided: A cryogenic combined pressure regulating valve, comprising:

[0005] A lower pressing block and a diaphragm configured to hermetically separate the upper cover and the valve body;

[0006] A first valve cavity passage configured to communicate the upper valve cavity at the top of the valve body and the lower valve cavity at the bottom;

[0007] A lower valve flap configured to communicate or isolate the first valve cavity passage and the lower valve cavity;

[0008] A pressure reducing interface, a pressure increasing interface, and an air inlet interface provided on the side wall of the valve body. The pressure reducing interface communicates with the upper valve cavity, the pressure increasing interface communicates with the first valve cavity passage, and the air inlet interface communicates with the lower valve cavity;

[0009] A pressure regulating screw is provided on the top of the upper cover. An upper pressing block and a pressure regulating spring are provided inside the upper cover. The pressure regulating screw presses against the top of the upper pressing block. The bottom of the upper pressing block presses against the upper end of the pressure regulating spring. The lower end of the pressure regulating spring presses against the top of the lower pressing block. The bottom of the lower pressing block presses against the diaphragm. The diaphragm is clamped between the upper cover and the valve body. A rear cover is provided at the bottom of the valve body. A return spring is provided between the rear cover and the lower valve flap;

[0010] An upper valve seat is movably arranged in the upper valve cavity. A groove is arranged at the top of the lower valve flap, and the bottom of the upper valve seat is fixedly arranged in the groove. A first through hole is arranged in the middle of the upper valve seat, and a second through hole communicating with the first through hole is arranged on the side of the lower valve flap. A sealing fillet is arranged at the top end of the upper valve seat. When the pressure in the gas phase space of the Dewar flask is less than or equal to the set pressure, the diaphragm contacts the sealing fillet. When the pressure in the gas phase space of the Dewar flask is greater than the set pressure, the diaphragm separates from the sealing fillet. A sealing ring is arranged between the lower valve flap and the inner wall of the valve body.

[0011] Compared with the prior art, the present invention achieves the following beneficial effects:

[0012] 1. By arranging a sealing fillet at the top end of the upper valve seat and using a sealing ring between the lower valve flap and the inner wall of the valve body, the present invention improves the internal sealing performance of the pressure regulating valve during the pressurization of the Dewar flask, thereby accelerating the pressurization speed of the Dewar flask.

[0013] 2. By arranging a first through hole in the middle of the upper valve seat and a second through hole communicating with the first through hole on the side of the lower valve flap, when the pressure in the Dewar flask is greater than the set value, the diaphragm separates from the upper valve seat, enabling the boost interface to communicate with the pressure relief interface, thereby realizing the pressure relief of the Dewar flask. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the disclosure of the present invention, and are used together with the specification to explain the principles of the present disclosure.

[0015] Figure 1 It is a schematic cross-sectional view of the boost interface and the pressure relief interface of the pressure regulating valve when the pressure in the gas phase space of the Dewar flask is lower than the set pressure;

[0016] Figure 2 It is a schematic cross-sectional view of the intake interface of the pressure regulating valve when the pressure in the gas phase space of the Dewar flask is lower than the set pressure;

[0017] Figure 3 It is a schematic cross-sectional view of the boost interface and the pressure relief interface of the pressure regulating valve when the pressure in the gas phase space of the Dewar flask reaches or exceeds the set pressure of the pressure regulating valve;

[0018] Figure 4 It is a schematic cross-sectional view of the intake interface of the pressure regulating valve when the pressure in the gas phase space of the Dewar flask reaches or exceeds the set pressure of the pressure regulating valve;

[0019] Figure 5 It is a schematic enlarged view of the structure at A;

[0020] Figure 6 It is a schematic enlarged view of the structure at B.

[0021] Reference numerals in the drawings: 10 - valve body, 11 - upper valve chamber, 12 - upper valve seat, 121 - sealing fillet, 122 - first through hole, 13 - sealing ring, 14 - valve stem, 141 - groove, 142 - second through hole, 15 - first valve chamber passage, 16 - lower valve seat, 17 - valve flap, 171 - valve flap core, 172 - valve flap hole, 18 - lower valve chamber, 20 - upper cover, 21 - pressure regulating screw, 22 - upper pressing block, 221 - steel ball, 23 - pressure regulating spring, 24 - lower pressing block, 25 - limit seat, 30 - rear cover, 31 - return spring, 40 - diaphragm, 50 - air inlet interface, 60 - pressure boosting interface, 61 - second valve chamber passage, 70 - pressure reducing interface, 71 - third valve chamber passage. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Embodiment

[0024] Reference Figures 1-6, a low-temperature combined pressure regulating valve, comprising a lower pressing block 24 and a diaphragm 40 configured to hermetically separate an upper cover 20 and a valve body 10; a first valve cavity passage 15 configured to communicate an upper valve cavity 11 at the top of the valve body 10 and a lower valve cavity 18 at the bottom; a lower valve flap configured to communicate or isolate the first valve cavity passage 15 and the lower valve cavity 18; a pressure reducing interface 70, a pressure increasing interface 60, and an air inlet interface 50 provided on the side wall of the valve body, the pressure reducing interface 70 communicates with the upper valve cavity 11 through a third valve cavity passage 71, the pressure increasing interface 60 communicates with the first valve cavity passage 15 through a second valve cavity passage 61, and the air inlet interface 50 communicates with the lower valve cavity 18 through a fourth valve cavity passage 51; a pressure regulating screw 21 is provided at the top of the upper cover 20, an upper pressing block 22 and a pressure regulating spring 23 are provided inside the upper cover 20, the pressure regulating screw 21 presses against the top of the upper pressing block 22, the bottom of the upper pressing block 22 presses against the upper end of the pressure regulating spring 23, the lower end of the pressure regulating spring 23 presses against the top of the lower pressing block 24, the bottom of the lower pressing block 24 presses against the diaphragm 40, the diaphragm 40 is clamped between the upper cover 20 and the valve body 10, a rear cover 30 is provided at the bottom of the valve body 10, and a return spring 31 is provided between the rear cover 30 and the lower valve flap; an upper valve seat 12 is movably provided in the upper valve cavity 11, a groove 141 is provided at the top of the lower valve flap, the bottom of the upper valve seat 12 is fixedly provided in the groove 141, a first through hole 122 is provided in the middle of the upper valve seat 12, a second through hole 142 communicating with the first through hole 122 is provided at the side of the lower valve flap, a sealing fillet 121 is provided at the top end of the upper valve seat 12. When the pressure in the gas phase space of the Dewar flask is less than or equal to the set pressure, the diaphragm 40 contacts the sealing fillet 121 to achieve sealing. When the pressure in the gas phase space of the Dewar flask is greater than the set pressure, the diaphragm 40 disengages from the sealing fillet 121, and a sealing ring 13 is provided between the lower valve flap and the inner wall of the valve body 10.

[0025] In the present invention, by providing a sealing fillet 121 at the top end of the upper valve seat 12 and using a sealing ring 13 between the lower valve flap and the inner wall of the valve body 10, the internal sealing performance of the pressure regulating valve during the pressurization of the Dewar flask is improved, thereby accelerating the pressurization speed of the Dewar flask. By providing a first through hole 122 in the middle of the upper valve seat 12 and a second through hole 142 communicating with the first through hole 122 at the side of the lower valve flap, when the pressure in the Dewar flask is greater than the set value, the diaphragm 40 separates from the upper valve seat 12, so that the pressure increasing interface 60 communicates with the pressure reducing interface 70, realizing the pressure reduction of the gas phase space of the Dewar flask.

[0026] In this embodiment, the upper valve seat 12 is made of fluoroplastic material.

[0027] In this embodiment, an interference fit is adopted between the bottom of the upper valve seat 12 and the groove 141. Such a design not only further improves the internal sealing performance of the pressure regulating valve during the pressurization of the Dewar flask and accelerates the pressurization speed, but also prevents the upper valve seat and the lower valve flap from separating during movement.

[0028] In this embodiment, steel balls 221 are arranged on the top of the upper pressing block 22, and the pressure regulating screw 21 is in pressing contact with the steel balls 221. By arranging the steel balls 221 between the pressure regulating screw 21 and the upper pressing block 22, the frictional force of the rotation of the steel balls 221 is much smaller than the frictional force of the direct contact between the pressure regulating screw 21 and the upper pressing block 22, which is beneficial to reducing the torque during pressure regulation.

[0029] In this embodiment, the lower valve flap includes a valve stem 14 and a valve flap 17. A valve flap hole 172 for accommodating the valve stem is formed in the valve flap 17. By making the valve flap 17 and the valve stem 14 into a split type, compared with the integral type, this split type can prevent the valve body from having poor coaxiality in the processing of the upper and lower holes or the upper hole not being perpendicular to the lower sealing surface, resulting in the rod being skewed after assembly and causing the valve flap not to be sealed with the valve body.

[0030] In this embodiment, a lower valve seat 16 is arranged on the inner wall where the first valve cavity channel 15 is connected to the lower valve cavity 18. A valve flap core 171 is arranged on the valve flap 17 corresponding to the lower valve seat 16. Such a design increases the sealing performance between the first valve cavity 15 and the lower valve cavity 18.

[0031] In this embodiment, a chamfer 173 adapted to the sealing surface of the rear cover 30 is provided on the valve flap 17. By designing the contact part between the valve flap and the rear cover as the chamfer 173, it is beneficial to increase the space for the up and down movement of the valve flap.

[0032] In this embodiment, limit seats 25 for limiting the lower pressing block 24 are arranged on both sides of the bottom of the upper cover 20. The movement of the lower pressing block 24 is limited by designing the limit seats 25.

[0033] The working principle of the present invention: During use, the air inlet interface 50 is connected to the Dewar bottle booster coil, the pressure boost interface 60 is connected to the gas phase space of the Dewar bottle, and the pressure reduction is connected to the vaporization pipeline of the Dewar bottle. When the pressure value in the Dewar bottle is lower than the set pressure, as Figures 1-2 shown, the force of the pressure regulating spring 23 is greater than the pressure of the air pressure on the diaphragm 40. The diaphragm 40 drives the upper valve seat 12 to move downward, separating the lower valve flap 14 from the lower valve seat 16. The gas vaporized in the booster coil enters the lower valve cavity 18 through the air inlet interface 50, and then enters the gas phase space of the Dewar bottle through the pressure boost interface 60, realizing the pressurization of the Dewar bottle. During this process, the lower valve flap and the first valve cavity channel 15 are sealed by the sealing ring 13, and the diaphragm 40 is in contact with the upper valve seat 12 to achieve sealing. The pressure boost interface 60 and the pressure reduction interface 70 are completely blocked before reaching the set pressure, so that the vaporization pipeline of the Dewar bottle does not frost during liquid filling, and at the same time, the pressure boost speed of the Dewar bottle is increased.

[0034] When the pressure in the gas phase space of the Dewar bottle reaches or exceeds the set pressure of the pressure regulating valve, as Figures 3-4As shown, the force of the pressure regulating spring 23 is less than the pressure of the air pressure on the diaphragm 40. The pressure in the upper valve chamber 11 presses the diaphragm 40 to the equilibrium state. The upper valve seat 12 and the lower valve flap 14 move upward under the action of the return spring 31. The lower valve flap 14 contacts the lower valve seat 16, cutting off the air inlet and the pressure boosting interface 60, and the pressure regulating valve stops boosting. When the Dewar flask is placed for a long time without use or has a poor vacuum degree, the Dewar flask will naturally boost pressure through heat exchange. The diaphragm 40 is separated from the upper valve seat 12, and the sealing function disappears. It communicates with the upper valve chamber 11 through the first through hole 122 and the second through hole 142, so that the pressure boosting interface 60 communicates with the pressure reducing interface 70. When the gas pipeline at the pressure reducing interface 70 is opened, the excess pressure in the gas phase space of the Dewar flask passes through the pressure boosting interface 60, the second through hole 142, and the first through hole 122 to reach the pressure reducing interface 70 and enters the gas pipeline to be discharged preferentially, achieving the function of pressure reduction. When the pressure drops to the set pressure, the sealing between the parts takes effect again, cutting off the pressure boosting interface 60 and the pressure reducing interface 70 again, so that the gas pipeline only uses the vaporized gas and does not use the gas in the gas phase space of the Dewar flask. When the gas phase space in the Dewar flask increases and the pressure decreases due to the vaporization of the liquid during gas use, the lower valve flap 14 and the lower valve seat 16 of the pressure regulating valve open again for boosting, repeating the above actions.

[0035] The above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those skilled in the technical field to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A low-temperature combined pressure regulating valve, comprising: A lower pressing block and a diaphragm configured to hermetically separate the upper cover and the valve body; A first valve cavity channel configured to connect the upper valve cavity at the top of the valve body and the lower valve cavity at the bottom; A lower valve flap configured to connect or isolate the first valve cavity channel and the lower valve cavity; A pressure reducing interface, a pressure increasing interface, and an air inlet interface provided on the side wall of the valve body, the pressure reducing interface communicates with the upper valve cavity, the pressure increasing interface communicates with the first valve cavity channel, and the air inlet interface communicates with the lower valve cavity; A pressure regulating screw is provided at the top of the upper cover, an upper pressing block and a pressure regulating spring are provided inside the upper cover, the pressure regulating screw presses against the top of the upper pressing block, the bottom of the upper pressing block presses against the upper end of the pressure regulating spring, the lower end of the pressure regulating spring presses against the top of the lower pressing block, the bottom of the lower pressing block presses against the diaphragm, the diaphragm is clamped between the upper cover and the valve body, a rear cover is provided at the bottom of the valve body, and a return spring is provided between the rear cover and the lower valve flap; It is characterized in that an upper valve seat is movably provided in the upper valve cavity, the upper valve seat is made of fluoroplastic material, a groove is provided at the top of the lower valve flap, the bottom of the upper valve seat is fixedly provided in the groove, a first through hole is provided in the middle of the upper valve seat, a second through hole communicating with the first through hole is provided on the side of the lower valve flap, the lower valve flap includes a valve stem and a valve flap, a valve flap hole for accommodating the valve stem is provided on the valve flap, a sealing fillet is provided at the top end of the upper valve seat, when the pressure in the gas phase space of the Dewar flask is less than or equal to the set pressure, the diaphragm contacts the sealing fillet to achieve sealing, when the gas phase space of the Dewar flask is greater than the set pressure, the diaphragm is separated from the sealing fillet, and a sealing ring is provided between the lower valve flap and the inner wall of the valve body.

2. The low-temperature combined pressure regulating valve according to claim 1, wherein An interference fit is adopted between the bottom of the upper valve seat and the groove.

3. The low-temperature combined pressure regulating valve according to claim 1, characterized in that, A steel ball is provided at the top of the upper pressing block, and the pressure regulating screw is in pressing contact with the steel ball.

4. The low-temperature combined pressure regulating valve according to claim 1, characterized in that, A lower valve seat is provided on the inner wall where the first valve cavity channel is connected to the lower valve cavity, and a valve flap core is provided at the corresponding position of the valve flap on the lower valve seat.

5. A low-temperature combined pressure regulating valve according to claim 1, characterized in that, A chamfer is provided on the valve flap that is adapted to the sealing surface of the rear cover.

6. The low-temperature combined pressure regulating valve according to claim 1, wherein A limit seat for limiting the lower pressing block is provided at the bottom of the upper cover.

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