Ultralow temperature stop valve

Abstract

The application discloses an ultra-low temperature stop valve, a valve core for liquid path blocking control is installed on a valve body, the valve core is installed on the valve body through a base, an adjusting structure for controlling flow by inflation is installed on the base, the adjusting structure contains an air bag for controlling the flow of the liquid path, the flow is adjusted by inflation and exhaust of the air bag, when the air bag is in a full inflation state, the air bag completely blocks the liquid path, when the air in the air bag is exhausted, the liquid path is completely opened, thus the flow is adjusted by inflation and exhaust of the air bag; a baffle is arranged, the baffle plays a role in blocking the liquid path, the flow speed of the liquid path is slowed down, and water hammer effect is avoided, when the liquid path passes through the baffle, part of the liquid path is shielded by the baffle, the liquid flow at the back is impacted by a reaction force, so that the flow speed of the liquid path is slowed down, when the liquid path passes through the baffle, the cross-sectional area suddenly becomes large, so that the flow speed of the liquid path is further slowed down, and the water hammer effect is further avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of control valves, in particular to an ultra-low temperature stop valve. BACKGROUND

[0002] The ultra-low temperature stop valve is a valve specially used for harsh working conditions, usually working in a low-temperature environment. Compared with normal-temperature valves, the packing part of the valve is usually designed to be higher, and the valve stem is also a lengthened rod. In order to prevent deep cold deformation, the main parts of the ultra-low temperature stop valve are subjected to cryogenic treatment, which can ensure that the valve remains flexible in opening and closing under ultra-low temperature conditions.

[0003] The opening and closing part of the ultra-low temperature stop valve is a plug-shaped valve disc, the sealing surface is flat or conical, and the valve disc moves linearly along the center line of the valve seat. The valve stem can also be a lifting and rotating rod type for controlling 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 stop valve is very suitable for use as a cut-off valve.

[0004] In Chinese patent No. (CN118149108A), a manual ultra-low temperature stop valve is introduced, which specifically discloses a valve body assembly composed of a hand wheel, a valve stem, a connecting sleeve, and a valve disc. The valve body assembly is installed inside the body cover assembly, which 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 hand wheel from bottom to top. However, the skilled person in the art found in actual operation that the stop valve cannot control the flow rate, and strong water hammer effect occurs during the opening and closing of the stop valve. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the present application provides an ultra-low temperature stop valve. By setting an air bag, the flow rate is adjusted by inflating and deflating the air bag. When the air bag is in a full gas state, the air bag completely blocks the liquid path. When the air in the air bag is exhausted, the liquid path is completely opened. Therefore, the inflation and deflation of the air bag can adjust the flow rate. By setting a baffle, the baffle blocks the liquid path, slows down the liquid flow, and avoids water hammer effect. When the liquid path passes through the baffle, part of the liquid path is blocked by the baffle and is impacted by the reaction force, thereby slowing down the liquid flow. When the liquid path passes through the baffle, the cross-sectional area suddenly increases, further slowing down the liquid flow, and further avoiding water hammer effect.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an ultra-low temperature shut-off valve, comprising a valve body, wherein a valve core for liquid circuit blocking control is installed on the valve body, the valve core is mounted on the valve body via a base, the base is mounted on the valve body via screws, and an adjustment structure for controlling flow rate by inflation is installed on the base, the adjustment structure comprising an air bladder for controlling liquid circuit flow rate.

[0007] As a preferred embodiment of the present invention, the valve body includes a valve shell, and flanges for connecting the valve shell are installed at both ends of the valve shell, and a sealing gasket is provided at the end of the valve shell.

[0008] As a preferred embodiment of the present invention, the valve housing is provided with an inlet and an outlet at both ends, the inlet being lower than the outlet and connected to the outlet, a valve core being installed at the connection point, a cavity for receiving the valve core being provided above the connection point between the inlet and outlet, and a baffle being provided on the outlet.

[0009] As a preferred embodiment of the present invention, the airbag is mounted inside the valve housing via a mounting base, and the airbag is connected to an air pipe for venting.

[0010] As a preferred embodiment of the present invention, the trachea is provided with an installation cavity, the inner diameter of the installation cavity is larger than the inner diameter of the trachea, and a stopper is installed in the installation cavity, the stopper being installed on the installation cavity by means of a spring.

[0011] As a preferred embodiment of the present invention, a bolt that mates with the stopper is provided at one end of the stopper near the spring. The bolt is threaded onto the mounting base, and the mounting base is fixedly mounted on the valve body.

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

[0013] As a preferred embodiment of the present invention, the valve core includes a core head, which is mounted on a disc. A control rod is mounted on the end of the disc away from the core head via a bearing. The control rod is a screw rod, which is threaded onto a base. A handle is coaxially provided on the end of the control rod away from the disc for easy operation.

[0014] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0015] 1. By setting the air bag, the flow is adjusted by inflating and deflating the air bag. When the air bag is in the full gas state, the air bag completely blocks the liquid path. When the air in the air bag is exhausted, the liquid path is completely opened. Therefore, the inflation and deflation of the air bag can adjust the flow;

[0016] 2. By setting the baffle, the function of blocking the liquid path is achieved, which can slow down the liquid flow speed and avoid water hammer effect. When the liquid path passes through the baffle, part of the liquid path is blocked by the baffle and is impacted by the reaction force to the rear liquid flow, thereby slowing down the liquid flow speed. When the liquid path passes through the baffle, the cross-sectional area suddenly increases, thereby further slowing down the liquid flow speed, thereby further avoiding the water hammer effect;

[0017] 3. The bolt and the plug of the device are in a separated state, so that the bolt can avoid affecting the air bag exhaust. Due to the impact of the water flow, the gas in the air bag will continue to be exhausted. If the maximum flow speed is not required, the bolt can be rotated at this time to make the bolt push the plug, so that the plug blocks the end of the air pipe, so that the gas in the air bag cannot be exhausted, thereby realizing the function of controlling the flow speed. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole cross-sectional structure schematic view of the ultra-low temperature stop valve of the application;

[0019] Figure 2 It is a cross-sectional structure schematic view of the valve body of the ultra-low temperature stop valve of the application;

[0020] Figure 3 It is a cross-sectional structure schematic view of the adjusting structure of the ultra-low temperature stop valve of the application;

[0021] Figure 4 It is a cross-sectional structure schematic view of the valve core of the ultra-low temperature stop valve of the application.

[0022] Among them: valve body 1; valve shell 11; liquid inlet 12; liquid outlet 13; cavity 14; baffle 15; flange 2; gasket 3; adjusting structure 4; mounting seat 41; air bag 42; air pipe 43; air inlet pipe 44; one-way valve 45; plug 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, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments, but the following embodiments are only preferred embodiments of the present application, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. In the following examples, the experimental methods are conventional methods, and the materials and reagents used in the following examples are commercially available unless otherwise specified.

[0024] Embodiment:

[0025] In combination with the figures shown in Figure 1 and Figure 3 , the present application provides an ultra-low temperature stop valve, which comprises a valve body 1, a valve core 6 for liquid path blocking control is installed on the valve body 1, the valve core 6 is installed on the valve body 1 through a base 5, the base 5 is installed on the valve body 1 through a screw, an adjusting structure 4 for controlling the flow by inflation is installed on the base 5, the adjusting structure 4 contains an air bag 42 for controlling the flow of the liquid path, the flow is adjusted by inflating and deflating the air bag 42, when the air bag 42 is in the full gas state, the air bag 42 will completely block the liquid path, when the air in the air bag 42 is exhausted, the liquid path will be completely opened, so the inflation and deflation of the air bag can realize the adjustment of the flow, the air bag 42 is preferably made of low-temperature-resistant silicone rubber material.

[0026] The low-temperature-resistant silicone rubber introduces a phenyl group on the side group of polysiloxane. Because the regularity of the dimethylsiloxane structure is destroyed, the crystallization temperature of the polymer is greatly reduced, which has the following advantages:

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

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

[0029] 2. Strong chemical corrosion resistance.

[0030] Low-temperature-resistant silicone rubber has excellent resistance to corrosion of most acids, bases, 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 rubber material rarely ages and deteriorates during long-term operation, which is related to its excellent chemical stability and thermal stability.

[0033] 4. Waterproof and moistureproof.

[0034] Low temperature resistant silica gel has the performance of water resistance, waterproofness and moisture resistance, which makes it widely used in the fields of electronics, automobiles, medical treatment and so on.

[0035] 5. Wear and corrosion resistant.

[0036] Low temperature resistant silica gel has excellent wear and corrosion resistance, which makes it able to be used in some occasions with high wear and strong corrosion.

[0037] Combination Figure 2 As shown in the combination, the valve body 1 comprises a valve shell 11, flanges 2 for connecting the valve shell 11 are installed at both ends of the valve shell 11, the flanges 2 protrude from the valve shell 11, sealing pads 3 are arranged at the ends of the valve shell 11, the sealing pads 3 are not lower than the flanges 2, the installation and connection of the device can be facilitated by using the flanges 2, and the leakage phenomenon at the connection of the valve shell 11 can be avoided by the sealing pads 3.

[0038] Liquid inlets 12 and liquid outlets 13 are arranged at both ends of the valve shell 11 respectively, the liquid inlets 12 are lower than the liquid outlets 13, the diameter of the liquid outlet 13 at the end position of the valve shell 11 is greater than the diameter of the liquid outlet 13 at the end inside the valve shell 11, so as to slow down the flow rate of the liquid path, the liquid inlets 12 are connected with the liquid outlets 13, valve spools 6 are installed at the connection positions thereof, cavities 14 for accommodating the valve spools 6 are arranged above the connection positions of the liquid inlets 12 and the liquid outlets 13 of the valve shell 11, the valve spools 6 can be accommodated by using the cavities 14, the valve spools can be avoided from affecting the liquid path when the liquid path flows, and the valve spools 6 can be avoided from being damaged due to the impact of the liquid path flow, baffles 15 are arranged on the liquid outlets 13, the baffles 15 play a role in blocking the liquid path, can slow down the flow rate of the liquid path, and avoid water hammer effect, when the liquid path flows through the baffles 15, part of the liquid path is blocked by the baffles 15, and the liquid flow at the back is impacted by the reaction force, so as to slow down the flow rate of the liquid path, when the liquid path flows through the baffles 15, the cross-sectional area suddenly becomes large, so as to further slow down the flow rate of the liquid path, and further avoid the water hammer effect.

[0039] Combination Figure 3 As shown in the combination, the air bags 42 are installed in the valve shell 11 by mounting seats 41, the fixation of the air bags 42 can be realized by using the mounting seats 41, and the air bags 42 can be avoided from being washed away by the liquid flow, air pipes 43 for exhausting air are connected with the air bags 42, when the liquid flow passes through the air bags, the impact force of the liquid flow will extrude the gas in the air bags 42 out of the air pipes 43, and the flow rate of the liquid flow is increased.

[0040] 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 plug 46 is mounted in the mounting cavity, the plug 46 is mounted on the mounting cavity by a spring 47, the spring 47 applies a pushing force to the plug 46, the plug 46 can prevent the gas in the air bag 42 from being discharged in normal state, and ensure the inflation of the air bag 42, the plug is preferably made of rubber, which is a high-elastic polymer material with reversible deformation, has elasticity at room temperature, can produce large deformation under the action of a small external force, and can restore to the original state after the external force is removed, and has the following advantages:

[0041] 1. Good anti-aging performance

[0042] The anti-aging performance of rubber is very good, even in harsh environments such as high temperature, low temperature, ultraviolet light, acid and alkali, the rubber can maintain good performance for a long time. This is because the rubber itself has very high chemical stability and weather resistance, and the synergistic effect of rubber and fillers and other additives can further improve the anti-aging performance of rubber.

[0043] 2. High elasticity

[0044] The high elasticity of rubber is due to the high stretchability of its molecular chain. Under stress, the rubber molecular chain can freely stretch and contract, thus showing excellent elastic properties. The high elasticity of rubber can be widely used in various fields requiring elastic materials, such as tires, springs, seals, vibration absorbers, etc.

[0045] 3. Wear resistance

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

[0047] The plug 46 is provided with a bolt 48 cooperating with the plug 46 near the end of the spring 47, the bolt 48 is mounted on the mounting seat 49 by threads, the mounting seat 49 is fixedly mounted on the valve housing 11, in normal state, the bolt 48 is separated from the plug 46, so as to avoid the influence of the bolt 48 on the air bag 42, due to the impact of water flow, the gas in the air bag 42 is continuously discharged, if the maximum flow rate is not required, the bolt 48 can be rotated at this time, the bolt 48 drives the plug 46, the plug 46 blocks 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 in the installation cavity and the air bag 42 position communication has the air inlet pipe 44, the air inlet pipe 44 far from the air pipe 43 one end is connected with air pump, to avoid air bag 42 in the gas from air inlet pipe 44 discharge, the air inlet pipe 44 installs one-way valve 45, utilize one-way valve 45 can limit gas flow rate, in air pump to air inlet pipe 44 injection, rotation bolt 48, make bolt 48 and stopper 46 contact, thus can avoid gas from stopper 46 discharge, to reach the purpose of air bag 42 injection.

[0049] In combination Figure 4 As shown, the valve core 6 includes core head 61, the core head 61 is preferably of rubber material, the core head middle position is provided with annular groove, because the core head 61 annular groove position diameter is smaller, can better produce deformation, avoid in core head extrusion force effect will cut-off valve close, core head 61 received force is too large to cause core head 61 damage, the core head 61 is installed on the disc 62, the disc 62 is preferably of stainless steel or cast iron material, utilize disc 62 can realize the installation of core head 61 fixed, the drive of core head 61 is convenient, the disc 62 far from the core head 61 one end is installed with control rod 64 through bearing 63, the control rod 64 is screw rod, control rod 64 is installed on base 5 through screw thread, through the screw thread cooperation of control rod 64 and base 5, can be convenient control rod 64 drive core head 61, control rod 64 far from the disc 62 one end is coaxially provided with handle 65 convenient control rod 64 control.

[0050] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above examples, the above examples and descriptions in the specification are only preferred examples of the present application, and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An ultra-low temperature stop valve comprising a valve body (1) having a valve core (6) for liquid path blocking control mounted thereon, the valve core (6) being mounted on the valve body (1) by a base (5) mounted on the valve body (1) by a screw, characterized in that: The base (5) is provided with an adjusting structure (4) for controlling flow by inflation, which comprises a gas bag (42) for controlling flow of liquid; The gas bag (42) is installed in the valve housing (11) through a mounting seat (41), and the gas bag (42) is communicated with a gas pipe (43) for exhausting gas; The gas pipe (43) is provided with a mounting cavity, the inner diameter of the mounting cavity is larger than that of the gas pipe (43), and a stopper (46) is installed in the mounting cavity, and the stopper (46) is installed on the mounting cavity through a spring (47); One end of the stopper (46) close to the spring (47) is provided with a bolt (48) matched with the stopper (46), the bolt (48) is installed on a mounting seat (49) through threads, and the mounting seat (49) is fixedly installed on the valve housing (11); The gas pipe (43) is communicated with an air inlet pipe (44) at a position between the mounting cavity and the gas bag (42), one end of the air inlet pipe (44) away from the gas pipe (43) is connected with a gas pump, and the air inlet pipe (44) is provided with a one-way valve (45).

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

3. An ultra-low temperature stop valve according to claim 2, characterised in that: Both ends of the valve housing (11) are provided with liquid inlets (12) and liquid outlets (13), respectively, the liquid inlet (12) is lower than the liquid outlet (13), the liquid inlet (12) and the liquid outlet (13) are communicated, a valve core (6) is installed at the communication position, a cavity (14) for accommodating the valve core (6) is arranged above the communication position of the liquid inlet (12) and the liquid outlet (13) of the valve housing (11), and a baffle (15) is arranged on the liquid outlet (13).

4. The ultra-low temperature stop valve of claim 1, wherein: The valve core (6) comprises a core head (61), the core head (61) is installed on a disc (62), a control rod (64) is installed on the end of the disc (62) away from the core head (61) through a bearing (63), the control rod (64) is a screw rod, the control rod (64) is installed on the base (5) through threads, and a handle (65) is coaxially arranged on the end of the control rod (64) away from the disc (62) for facilitating control of the control rod (64).

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