Ultralow-temperature stop valve

Abstract

A valve element used for liquid path blocking control is installed on a valve body, the valve element is installed on the valve body through a base, an adjusting structure used for controlling flow through inflation is installed on the base, the adjusting structure comprises an air bag used for controlling the flow of a liquid path, and flow adjustment is achieved through inflation and exhaust of the air bag. When the air bag is in a full air state, the air bag completely blocks the liquid path, and when air in the air bag is emptied, the liquid path is completely opened, so that flow adjustment can be realized by inflating and deflating the air bag; by arranging the baffle, the effect of blocking the liquid path can be achieved, the water hammer effect can be avoided, the liquid path is blocked by the baffle, when the liquid path flows through the baffle, part of the liquid path is blocked by the baffle and impacts liquid flow behind the liquid path under the action of counter-acting force, and therefore the flow speed of the liquid path is slowed down, and when the liquid path passes through the baffle, the cross section area is suddenly increased. Therefore, the flow velocity of a liquid path is further slowed down, and the water hammer effect is further avoided.

Description

Technical Field

[0001] The invention relates to the field of control valves, in particular to an ultra-low temperature stop valve. Background Art

[0002] Ultra-low temperature stop valve is a valve specially designed for harsh working conditions. It usually works in a low temperature environment. Compared with normal temperature valves, the valve packing part is usually designed to be higher, and the valve stem is also extended. In order to prevent deep cold deformation, the main parts of the ultra-low temperature stop valve are all cryogenically treated, which can ensure that the valve can remain flexible in the ultra-low temperature state.

[0003] The opening and closing parts of the cryogenic globe valve are plug-shaped discs, with a flat or sea cone surface on the sealing surface, and the disc moves linearly along the center line of the valve seat. The movement of the valve stem also has a lifting and rotating rod type, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, this type of shut-off globe valve is very suitable for cutting off.

[0004] In a Chinese patent, patent number (CN118149108A) introduces a manual ultra-low temperature stop valve, which specifically discloses a valve body assembly consisting of a handwheel, a valve stem, a connecting sleeve, and a valve disc. The valve body assembly is installed as a whole inside a body cover assembly. The body cover assembly is perpendicular to the pipeline and is installed on the pipeline through threads. The valve body assembly is composed of a valve disc, a valve stem, a connecting sleeve, and a handwheel from bottom to top. However, technicians in this field have found in actual operation that the stop valve cannot control the flow rate, and a strong water hammer effect will be generated during the opening and closing process of the stop valve. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an ultra-low temperature stop valve, which adjusts the flow rate by arranging an airbag and utilizing the inflation and exhaust of the airbag. When the airbag is in a fully inflated state, the airbag completely blocks the liquid path, and when the air in the airbag is exhausted, the liquid path is completely opened, thereby utilizing the inflation and exhaust of the airbag to adjust the flow rate. By arranging a baffle, the liquid path is blocked, the flow rate of the liquid path can be slowed down, and the water hammer effect can be avoided. When the liquid path flows through the baffle, part of the liquid path is blocked by the baffle, and the reaction force causes an impact on the rear liquid flow, thereby slowing down the flow rate of the liquid path. When the liquid path passes through the baffle, the cross-sectional area suddenly increases, thereby further slowing down the flow rate of the liquid path, thereby further avoiding the water hammer effect.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an ultra-low temperature stop valve, comprising a valve body, on which is installed a valve core for liquid circuit blocking control, the valve core is installed on the valve body through a base, and the base is installed on the valve body through screws, and an adjustment structure for controlling the flow by inflation is installed on the base, and the adjustment structure includes an air bag for controlling the liquid circuit flow.

[0007] As a preferred technical solution of the present invention, the valve body includes a valve housing, flanges for connecting the valve housing are installed at both ends of the valve housing, and sealing gaskets are arranged at the ends of the valve housing.

[0008] As a preferred technical solution of the present invention, a liquid inlet and a liquid outlet are respectively provided at both ends of the valve housing, the liquid inlet is lower than the liquid outlet, the liquid inlet is connected with the liquid outlet, a valve core is installed at the connecting position thereof, and a cavity for accommodating the valve core is provided on the valve housing above the connecting position between the liquid inlet and the liquid outlet, and a baffle is provided on the liquid outlet.

[0009] As a preferred technical solution of the present invention, the airbag is installed in the valve housing through a mounting seat, and the airbag is connected to an air pipe for exhausting gas.

[0010] As a preferred technical solution of the present invention, an installation cavity is provided on the trachea, the inner diameter of the installation cavity is larger than the inner diameter of the trachea, a stopper is installed in the installation cavity, and the stopper is installed on the installation cavity through a spring.

[0011] As a preferred technical solution of the present invention, a bolt cooperating with the stopper is arranged at one end of the stopper close to the spring, the bolt is installed on the mounting seat through threads, and the mounting seat is fixedly installed on the valve housing.

[0012] As a preferred technical solution of the present invention, the air pipe is connected to an air inlet pipe between the installation cavity and the airbag, an end of the air inlet pipe away from the air pipe is connected to an air pump, and a one-way valve is installed in the air inlet pipe.

[0013] As a preferred technical solution of the present invention, the valve core includes a core head, which is installed on a disc. A control rod is installed at one end of the disc away from the core head through a bearing. The control rod is a screw rod, which is installed on the base through a thread. A handle for facilitating the operation of the control rod is coaxially arranged at one end of the control rod away from the disc.

[0014] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0015] 1. By setting up an airbag, the flow rate can be adjusted by inflating and exhausting the airbag. When the airbag is fully inflated, the airbag completely blocks the liquid path. When the air in the airbag is emptied, the liquid path is completely opened. Therefore, the flow rate can be adjusted by inflating and exhausting the airbag.

[0016] 2. By setting a baffle, the liquid path is blocked, the flow rate of the liquid path can be slowed down, and the water hammer effect can be avoided. When the liquid path flows through the baffle, part of the liquid path is blocked by the baffle, and the reaction force causes an impact on the rear liquid flow, thereby slowing down the flow rate of the liquid path. When the liquid path passes through the baffle, the cross-sectional area suddenly increases, thereby further slowing down the flow rate of the liquid path, thereby further avoiding the water hammer effect;

[0017] 3. The bolts and the stopper of this device are separated, so the bolts can avoid affecting the exhaust of the airbag. The impact of the water flow will cause the gas in the airbag to be continuously discharged. If the maximum flow rate is not required, the bolts can be rotated to push the stopper, so that the stopper is blocked at the end of the air pipe, so that the gas in the airbag cannot be discharged, thereby achieving the function of controlling the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall cross-sectional structure of a cryogenic stop valve of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of a valve body of a cryogenic stop valve of the present invention;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of an adjustment structure of a cryogenic stop valve of the present invention;

[0021] Figure 4 The figure is a schematic diagram of the cross-sectional structure of a valve core of a cryogenic stop valve according to the present invention.

[0022] Among them: valve body 1; valve shell 11; liquid inlet 12; liquid outlet 13; cavity 14; baffle 15; flange 2; sealing gasket 3; adjustment structure 4; mounting seat 41; air bag 42; air pipe 43; air inlet pipe 44; one-way valve 45; stopper 46; spring 47; bolt 48; mounting seat 49; base 5; valve core 6; core head 61; disc 62; bearing 63; control rod 64; handle 65. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. The experimental methods in the following embodiments, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can all be obtained from commercial channels.

[0024] Embodiment:

[0025] Combination Figure 1 and Figure 3 As shown, the present invention provides an ultra-low temperature stop valve, including a valve body 1, on which a valve core 6 for controlling liquid circuit blocking is installed, the valve core 6 is installed on the valve body 1 through a base 5, and the base 5 is installed on the valve body 1 through screws, and an adjustment structure 4 for controlling the flow by inflation is installed on the base 5, the adjustment structure 4 includes an air bag 42 for controlling the liquid circuit flow, and the flow is regulated by inflating and exhausting the air bag 42. When the air bag 42 is in a full air state, the air bag 42 completely blocks the liquid circuit, and when the air in the air bag 42 is emptied, the liquid circuit is completely opened, so that the flow can be regulated by inflating and exhausting the air bag, and the air bag 42 is preferably made of low-temperature resistant silicone rubber.

[0026] Low temperature resistant silicone rubber introduces phenyl groups on the side groups of polysiloxane, which destroys the regularity of the dimethylsiloxane structure and greatly reduces the crystallization temperature of the polymer. It has the following advantages:

[0027] 1. Able to maintain good physical and mechanical properties in extremely low temperature environment.

[0028] Low-temperature resistant silicone is a special silicone whose excellent low-temperature performance means it can work at extremely low temperatures, which is very useful for equipment that needs to work in a low-temperature environment.

[0029] 2. Strong resistance to chemical corrosion.

[0030] Low temperature resistant silicone has excellent resistance to corrosion by most acids, alkalis, salts and most organic substances, which enables it to be used in some chemically unstable environments.

[0031] 3. Not easy to deteriorate and age.

[0032] Low-temperature resistant silicone materials rarely age or deteriorate during long-term operation, which is related to their superior chemical stability and thermal stability.

[0033] 4. Waterproof and moisture-proof.

[0034] Low-temperature resistant silicone has the properties of water-proof, waterproof and moisture-proof, which makes it widely used in electronics, automobiles, medical and other fields.

[0035] 5. Wear-resistant and corrosion-resistant.

[0036] Low temperature resistant silicone has excellent wear resistance and corrosion resistance, which enables it to be used in some high wear and corrosion situations.

[0037] Combination Figure 2 As shown, the valve body 1 includes a valve housing 11, and flanges 2 for connecting the valve housing 11 are installed at both ends of the valve housing 11. The flange 2 protrudes from the valve housing 11, and a sealing gasket 3 is provided at the end of the valve housing 11. The sealing gasket 3 is not lower than the flange 2. The flange 2 can facilitate the installation and connection of the device, and the sealing gasket 3 can avoid leakage at the connection of the valve housing 11.

[0038] The two ends of the valve housing 11 are respectively provided with a liquid inlet 12 and a liquid outlet 13, the liquid inlet 12 is lower than the liquid outlet 13, the diameter of the liquid outlet 13 at the end of the valve housing 11 is larger than the diameter of the liquid outlet 13 at one end inside the valve housing 11, so that the flow rate of the liquid circuit can be slowed down, the liquid inlet 12 is connected with the liquid outlet 13, and a valve core 6 is installed at the connecting position thereof, and the valve housing 11 is provided with a cavity 14 for accommodating the valve core 6 above the connecting position of the liquid inlet 12 and the liquid outlet 13, and the valve core 6 can be accommodated by the cavity 14 to avoid the liquid circuit from flowing. The valve core affects the liquid path and can prevent the flow of the liquid path from impacting the valve core 6 and causing damage to the valve core 6. A baffle 15 is provided on the liquid outlet 13. The baffle 15 serves to block the liquid path, slow down the flow rate of the liquid path, and avoid the water hammer effect. When the liquid path flows through the baffle 15, part of the liquid path is blocked by the baffle 15, and the reaction force causes an impact on the rear liquid flow, thereby slowing down the flow rate of the liquid path. When the liquid path passes through the baffle 15, the cross-sectional area suddenly increases, thereby further slowing down the flow rate of the liquid path, thereby further avoiding the water hammer effect.

[0039] Combination Figure 3 As shown, the airbag 42 is installed in the valve housing 11 through a mounting seat 41. The mounting seat 41 can be used to fix the airbag 42 to prevent the airbag 42 from being washed away by the liquid flow. The airbag 42 is connected to an air pipe 43 for exhaust. When the liquid flows through the airbag, the impact force of the liquid flow will squeeze the gas in the airbag 42 out of the air pipe 43, thereby increasing the flow rate of the liquid flow.

[0040] The air pipe 43 is provided with an installation cavity, the inner diameter of which is larger than the inner diameter of the air pipe 43, and a stopper 46 is installed in the installation cavity, and the stopper 46 is installed in the installation cavity by a spring 47, and the spring 47 applies a thrust to the stopper 46, and the stopper 46 can prevent the gas in the airbag 42 from being discharged under normal conditions, so as to ensure the filling of the airbag 42, and the stopper is preferably made of rubber material, which is a highly elastic polymer material with reversible deformation, is elastic at room temperature, can produce a large deformation under a very small external force, and can return to its original state after the external force is removed, and has the following advantages:

[0041] 1.Good anti-aging performance

[0042] Rubber has excellent anti-aging properties. Even in harsh environments, such as high temperature, low temperature, ultraviolet rays, acid and alkali, rubber can maintain good performance for a long time. This is because rubber itself has extremely high chemical stability and weather resistance. At the same time, the synergistic effect of rubber and additives such as fillers will further improve the aging resistance of rubber.

[0043] 2. High elasticity

[0044] The high elasticity of rubber is due to the high extensibility of its molecular chains. Under stress, the rubber molecular chains can freely expand and contract, thus showing excellent elastic properties. The high elasticity of rubber can make it widely used in various fields that require elastic materials, such as tires, springs, seals, vibration absorbers, etc.

[0045] 3. Wear resistance

[0046] Rubber also has extremely high wear resistance. Even under conditions of high friction, high pressure, and high temperature, rubber can maintain good wear resistance for a long time. This is because the interaction between rubber molecular chains is very strong and can effectively resist damage from external factors. In various fields, such as tires, belts, seals, etc., rubber products with good wear resistance are needed.

[0047] The end of the stopper 46 close to the spring 47 is provided with a bolt 48 that cooperates with the stopper 46. The bolt 48 is installed on a mounting seat 49 through a thread. The mounting seat 49 is fixedly installed on the valve housing 11. Under normal circumstances, the bolt 48 and the stopper 46 are in a separated state, so the bolt 48 can be prevented from affecting the exhaust of the air bag 42. Due to the impact of the water flow, the gas in the air bag 42 will be continuously discharged. If the maximum flow rate is not required, the bolt 48 can be rotated at this time to make the bolt 48 push the stopper 46, so that the stopper 46 is blocked at the end of the air pipe 43, so that the gas in the air bag 42 cannot be discharged, thereby realizing the function of controlling the flow rate.

[0048] The air pipe 43 is located between the installation cavity and the airbag 42 and is connected to an air inlet pipe 44. The end of the air inlet pipe 44 away from the air pipe 43 is connected to an air pump. In order to prevent the gas in the airbag 42 from being discharged from the air inlet pipe 44, a one-way valve 45 is installed in the air inlet pipe 44. The one-way valve 45 can limit the gas flow rate. When the air pump injects air into the air inlet pipe 44, the bolt 48 is rotated to make the bolt 48 contact with the plug 46, thereby preventing the gas from being discharged from the plug 46 to achieve the purpose of injecting air into the airbag 42.

[0049] Combination Figure 4 As shown, the valve core 6 includes a core head 61, which is preferably made of rubber material. An annular groove is arranged in the middle of the core head. Since the annular groove of the core head 61 has a smaller diameter, it can be deformed better to avoid damage to the core head 61 caused by excessive force applied to the core head 61 when the core head is squeezed to close the stop valve. The core head 61 is installed on a disc 62, which is preferably made of stainless steel or cast iron. The disc 62 can be used to install and fix the core head 61, which is convenient for driving the core head 61. A control rod 64 is installed at one end of the disc 62 away from the core head 61 through a bearing 63. The control rod 64 is a screw rod, which is installed on the base 5 through a thread. The threaded cooperation between the control rod 64 and the base 5 can facilitate the driving of the core head 61 by the control rod 64. A handle 65 for convenient operation of the control rod 64 is coaxially arranged at one end of the control rod 64 away from the disc 62.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cryogenic stop valve, comprising a valve body (1), on which a valve core (6) for controlling liquid circuit blocking is mounted, wherein the valve core (6) is mounted on the valve body (1) via a base (5), and the base (5) is mounted on the valve body (1) via screws, characterized in that: The base (5) is provided with a regulating structure (4) for controlling the flow rate by inflation, and the regulating structure (4) comprises an air bag (42) for controlling the flow rate of the liquid path.

2. The ultra-low temperature stop valve according to claim 1, characterized in that: The valve body (1) comprises a valve housing (11), flanges (2) for connecting the valve housing (11) are installed at both ends of the valve housing (11), and sealing gaskets (3) are arranged at the ends of the valve housing (11).

3. The ultra-low temperature stop valve according to claim 2, characterized in that: The valve housing (11) is provided with a liquid inlet (12) and a liquid outlet (13) at both ends thereof, the liquid inlet (12) being lower than the liquid outlet (13), the liquid inlet (12) being connected to the liquid outlet (13), a valve core (6) being installed at the connecting position thereof, the valve housing (11) being provided with a cavity (14) for accommodating the valve core (6) above the connecting position between the liquid inlet (12) and the liquid outlet (13), and a baffle (15) being provided on the liquid outlet (13).

4. The ultra-low temperature stop valve according to claim 1, characterized in that: The air bag (42) is installed in the valve housing (11) via a mounting seat (41), and the air bag (42) is connected to an air pipe (43) for exhausting gas.

5. The ultra-low temperature stop valve according to claim 1, characterized in that: The air pipe (43) is provided with a mounting cavity, the inner diameter of the mounting cavity is larger than the inner diameter of the air pipe 43, a stopper (46) is installed in the mounting cavity, and the stopper (46) is installed on the mounting cavity via a spring (47).

6. The ultra-low temperature stop valve according to claim 5, characterized in that: A bolt (48) cooperating with the stopper (46) is provided at one end of the stopper (46) close to the spring (47); the bolt (48) is mounted on a mounting seat (49) through threads; and the mounting seat (49) is fixedly mounted on the valve housing (11).

7. The ultra-low temperature stop valve according to claim 6, characterized in that: The air pipe (43) is located between the installation cavity and the air bag (42) and is connected to an air intake pipe (44). An end of the air intake pipe (44) away from the air pipe (43) is connected to an air pump. A one-way valve (45) is installed in the air intake pipe (44).

8. The ultra-low temperature stop valve according to claim 1, characterized in that: The valve core (6) comprises a core head (61), wherein the core head (61) is mounted on a disc (62), and a control rod (64) is mounted on one end of the disc (62) away from the core head (61) via a bearing (63), wherein the control rod (64) is a screw rod, and the control rod (64) is mounted on the base (5) via a thread, and a handle (65) is coaxially arranged on one end of the control rod (64) away from the disc (62) for facilitating the operation of the control rod (64).

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