Low temperature resistant regulating valve

Abstract

The utility model provides a kind of low temperature resistant regulating valve, including valve body, valve cavity is equipped in valve body, valve core is equipped in valve cavity;Two sealing sleeves are equipped in valve body, sealing sleeve is located at the both sides of valve core;Sealing sleeve is sealedly connected with valve core;Pressure relief mechanism is equipped in valve body, pressure relief mechanism is close to the liquid outlet end of valve body;The bottom of valve core is equipped with positioning shaft, the top of valve core is equipped with valve rod;The top of valve body is equipped with handle, handle is connected with valve rod.The utility model valve core is made of high-strength low-temperature-resistant alloy material, surface is hardened and treated, and buffer plate can reduce liquefied air flow rate, reduce the impact on valve core, to effectively resist the corrosion and erosion of ultra-low temperature liquefied air, prolong the service life of valve core;Equipped with pressure relief mechanism, can be in time automatic pressure relief when pressure in valve cavity is too high, avoid the damage caused by high pressure of residual liquefied air temperature gasification to regulating valve, improve the safety and service life of regulating valve.

Description

Technical Field

[0001] This utility model relates to the field of liquefied air pipeline valve technology, specifically to a low-temperature resistant regulating valve. Background Technology

[0002] Cryogenic liquefied air energy rock breaking technology is a novel, green rock breaking method based on the energy release from the phase change of liquid air. It achieves rock breaking through the synergistic effect of cryogenic physical effects and mechanical energy. Its core principle is to utilize the property that liquid air (temperature approximately -196℃) expands in volume by about 700 times when it vaporizes at room temperature, generating a high-pressure shock wave that acts on the rock structure. At the same time, the cryogenic effect increases the brittleness of the rock, thereby achieving efficient rock breaking.

[0003] Cryogenic liquefied air energy rock-breaking technology achieves a green alternative to traditional blasting techniques through the synergy of cryogenic physical effects and mechanical energy. Its low vibration, zero pollution, and low cost characteristics demonstrate enormous potential in mining, water conservancy projects, and other fields. With breakthroughs in key technologies such as storage materials and intelligent control, as well as policy support and standardization efforts, this technology is expected to become the mainstream solution in the global rock-breaking industry by 2030, providing crucial support for achieving dual-carbon goals.

[0004] In the process of implementing cryogenic liquefied air rock breaking technology, liquefied air is transported through pipelines, which requires the use of regulating valves to adjust the transport rate and quantity of liquefied air. However, in actual use, due to the cryogenic liquefied air, high-speed passage through the control valve will cause certain corrosion to the valve core, affecting the service life of the regulating valve. Furthermore, after the transmission is completed and the valve is closed, some liquefied air will remain in the valve cavity. This is especially true for low-temperature control valves, such as ball valves. The liquefied air remaining in the valve cavity is prone to heating up and generating high pressure. If the pressure is not released in time, it will damage the control valve and affect its service life. Utility Model Content

[0005] The main purpose of this invention is to provide a cryogenic regulating valve to solve the problem that existing regulating valves are easily damaged and have a short service life when used in cryogenic liquefied air transportation.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A low-temperature resistant regulating valve includes a valve body, a valve cavity inside the valve body, and a valve core inside the valve cavity. The valve body is equipped with two sealing sleeves, which are located on both sides of the valve core; The sealing sleeve is sealed to the valve core. The valve body is equipped with a pressure relief mechanism, which is located near the liquid outlet end of the valve body.

[0007] In a preferred solution, the bottom of the valve core is provided with a positioning shaft, and the top of the valve core is provided with a valve stem; The top of the valve body is provided with a handle, and the handle is connected to the valve stem.

[0008] In a preferred solution, the liquid inlet end of the valve body is provided with a buffer plate; A plurality of through holes are arranged in the buffer plate.

[0009] In a preferred solution, the inner side of the sealing sleeve is provided with a sealing gasket; The sealing end is in close contact with the valve core.

[0010] In a preferred solution, the pressure relief mechanism includes a fixing sleeve arranged inside the valve body; The sealing sleeve adjacent to the fixing sleeve is provided with a plurality of guide rods; A plurality of guide holes are arranged on the side of the fixing sleeve close to the sealing sleeve, and a first spring is arranged in each guide block; The guide rod slidably extends into the interior of the guide hole and abuts against the first spring.

[0011] In a preferred solution, the sealing sleeve adjacent to the fixing sleeve is slidably connected to the valve body.

[0012] In a preferred solution, the pressure relief mechanism includes a connecting hole arranged inside the valve body, and the connecting hole is in communication with the valve chamber; A discharge hole is arranged inside the valve body, one end of the discharge hole is in communication with the discharge end of the valve body, and the other end is in communication with the connecting hole; A sealing plug is slidably connected in the valve body; One end of the sealing plug extends into the interior of the connecting hole, and the other end is provided with a second spring.

[0013] In a preferred solution, both ends of the valve body are provided with connecting sleeves; A connecting mechanism is arranged in the connecting sleeve.

[0014] In a preferred solution, the connecting mechanism comprises a positioning pipe fixed inside the valve body, a connecting cavity is formed between the positioning pipe and the connecting sleeve, and the connecting cavity is used for connecting an external pipe; The outer side of the external pipe and the inner side of the connecting sleeve are provided with threads, and the external pipe is in threaded connection with the connecting sleeve.

[0015] In a preferred solution, the end of the external pipe is provided with a stabilizing ring, and the inner side of the stabilizing ring is a conical surface; The outer periphery of the positioning pipe is provided with a positioning ring, and the outer periphery of the positioning ring is a conical surface; The positioning ring is adapted to the stabilizing ring.

[0016] The present utility model provides a low temperature resistant regulating valve. By adopting the above solutions, the following beneficial effects are obtained: 1. The valve core is made of high-strength, low-temperature resistant alloy material with a hardened surface. The buffer plate reduces the flow rate of liquefied air and minimizes the impact on the valve core, thereby effectively resisting the corrosion and erosion of ultra-low temperature liquefied air and extending the service life of the valve core.

[0017] 2. Equipped with a pressure relief mechanism, it can automatically relieve pressure in time when the pressure in the valve cavity is too high, avoiding damage to the control valve caused by the high pressure generated by the heating and vaporization of residual liquefied air, thus improving the safety and service life of the control valve. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 yes Figure 2 Enlarged schematic diagram of the structure at point A in the diagram; Figure 4 This is a schematic diagram of an embodiment of the present invention; Figure 5 This is a schematic diagram of an embodiment of the present invention.

[0019] In the picture: Valve body 1, connecting sleeve 101, handle 102, valve core 2, valve stem 201, positioning shaft 202, valve cavity 203, buffer plate 3, through hole 301, sealing sleeve 4, sealing gasket 401, pressure relief mechanism 5, fixing sleeve 501, guide rod 502, first spring 503, guide sleeve 504, connecting hole 505, discharge hole 506, sealing plug 507, second spring 508, outer pipe 601, positioning tube 602, stabilizing ring 603, positioning ring 604. Detailed Implementation

[0020] Example 1: like Figure 1 , 2 As shown in Figures 3, 4, and 5, a cryogenic regulating valve includes a valve body 1. The valve body 1 is made of cryogenic stainless steel, preferably 0Cr18Ni9Ti material, capable of withstanding ultra-low temperature environments down to -196℃ and possessing excellent corrosion resistance. The valve body 1 contains a valve cavity 203, within which is a valve core 2. The valve core 2 is made of a high-strength cryogenic alloy material, preferably Monel alloy, with a surface hardening treatment achieving a hardness of HRC50 or higher to enhance its corrosion and erosion resistance, and to withstand the high-speed impact of cryogenic liquefied air.

[0021] The valve body 1 contains two sealing sleeves 4, which are made of polytetrafluoroethylene (PTFE) with added glass fiber, exhibiting excellent low-temperature resistance and sealing performance, and can operate normally in environments down to -200℃. The sealing sleeves 4 are located on both sides of the valve core 2, forming a sealed connection with it to effectively prevent liquefied air leakage. Inside the sealing sleeves 4 is a sealing gasket 401, made of expanded graphite composite gasket, which possesses good elasticity and sealing performance. The sealing gasket 401 is tightly fitted to the valve core 2, further enhancing the sealing effect.

[0022] A pressure relief mechanism 5 is provided inside the valve body 1. The pressure relief mechanism 5 is located near the liquid outlet end of the valve body 1 and is used to promptly relieve pressure when the pressure inside the valve chamber 203 is too high. There are two implementation schemes for the pressure relief mechanism 5: Option 1: The pressure relief mechanism 5 includes a fixed sleeve 501 located inside the valve body 1. The fixed sleeve 501 is made of the same low-temperature stainless steel material as the valve body 1. A sealing sleeve 4 near the fixed sleeve 501 has several guide rods 502, made of high-strength alloy material, evenly distributed on the sealing sleeve 4. The fixed sleeve 501 has several guide holes on the side near the sealing sleeve 4, each corresponding to a guide rod 502. A first spring 503, made of low-temperature resistant spring steel, is installed inside each guide hole. The guide rods 502 slide into the guide holes and abut against the first spring 503. When the pressure inside the valve cavity 203 is too high, the pressure pushes the sealing sleeve 4 towards the fixed sleeve 501, compressing the first spring 503 and creating a gap between the sealing sleeve 4 and the valve body 1. High-pressure gas is discharged through the gap, achieving pressure relief. When the pressure returns to normal, the first spring 503 pushes the guide rods 502 and the sealing sleeve 4 back to their original positions, re-sealing. Furthermore, the sealing sleeve 4 near the fixed sleeve 501 is slidably connected to the valve body 1, ensuring that the sealing sleeve 4 can move flexibly.

[0023] Option 2: The pressure relief mechanism 5 includes a connecting hole 505 located inside the valve body 1, which communicates with the valve cavity 203. The valve body 1 has a discharge hole 506 inside, with one end connected to the discharge end of the valve body 1 and the other end connected to the connecting hole 505. A sealing plug 507 is slidably connected inside the valve body 1. The sealing plug 507 is made of copper alloy, providing good sealing and wear resistance, and has a sealing ring on its exterior. One end of the sealing plug 507 extends into the interior of the connecting hole 505, and the other end has a second spring 508, also made of low-temperature resistant spring steel. When the pressure inside the valve cavity 203 exceeds a set value, the pressure pushes the sealing plug 507 to compress the second spring 508, causing the sealing plug 507 to leave the connecting hole 505. High-pressure gas is then discharged through the connecting hole 505 and the discharge hole 506 to the discharge end of the valve body 1, achieving pressure relief. After the pressure returns to normal, the second spring 508 pushes the sealing plug 507 back to its original position, blocking the connecting hole 505.

[0024] The valve core 2 has a positioning shaft 202 at its bottom, and the valve body 1 has a positioning hole at its bottom. The positioning shaft 202 engages with the positioning hole at the bottom of the valve body 1 to ensure the stable rotation of the valve core 2 within the valve cavity 203 and to determine its rotational position. The valve core 2 has a valve stem 201 at its top. The valve stem 201 is made of high-strength stainless steel and chrome-plated to enhance its wear resistance and corrosion resistance. The valve stem 201 is sealed to the valve body 1 using common sealing methods for existing valves, such as using a sealing ring. The valve body 1 has a handle 102 at its top. The handle 102 is made of insulating material for easy operation in low-temperature environments. The handle 102 is connected to the valve stem 201. Rotating the handle 102 drives the valve stem 201 and the valve core 2 to rotate, thereby regulating the flow rate of liquefied air.

[0025] The inlet end of the valve body 1 is equipped with a buffer plate 3, which is made of low-temperature resistant stainless steel. The buffer plate 3 has several through holes 301, the diameter and number of which are designed according to the actual flow requirements; preferably 5-12. The buffer plate 3 can buffer the high-speed inflow of liquefied air, reduce its flow velocity, reduce the impact on the valve core 2, thereby reducing the corrosion and erosion of the valve core 2 and increasing its service life.

[0026] Both ends of the valve body 1 are provided with connecting sleeves 101, which are integrally cast with the valve body 1. A connecting mechanism is provided inside the connecting sleeve 101 for connecting to a pipeline for transmitting liquefied air. The connecting mechanism includes a positioning tube 602 fixed inside the valve body 1. The positioning tube 602 is made of low-temperature resistant stainless steel, and a connecting cavity is formed between the positioning tube 602 and the connecting sleeve 101. The connecting cavity is used to connect an external pipe 601; the external pipe 601 refers to the pipeline for transmitting liquefied air, including an inlet pipe and an outlet pipe. Threads are provided on the outer side of the external pipe 601 and the inner side of the connecting sleeve 101, and the external pipe 601 is threadedly connected to the connecting sleeve 101 to ensure a tight connection.

[0027] The outer tube 601 has a stabilizing ring 603 at its end, which is welded to the outer tube 601. The inner side of the stabilizing ring 603 is conical. The positioning tube 602 has a positioning ring 604 on its outer circumference, which is welded to the positioning tube 602. The outer circumference of the positioning ring 604 is conical, and it is compatible with the stabilizing ring 603. When the outer tube 601 is threadedly connected to the connecting sleeve 101, the conical surface of the stabilizing ring 603 and the conical surface of the positioning ring 604 fit tightly together, enhancing the sealing and stability of the connection and preventing liquefied air leakage.

[0028] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A low-temperature resistant regulating valve, characterized in that: Includes a valve body (1), a valve cavity (203) is provided inside the valve body (1), and a valve core (2) is provided inside the valve cavity (203); The valve body (1) is provided with two sealing sleeves (4), which are located on both sides of the valve core (2); The sealing sleeve (4) is sealed to the valve core (2); The valve body (1) is equipped with a pressure relief mechanism (5), which is located near the liquid outlet end of the valve body (1). The inlet end of the valve body (1) is equipped with a buffer plate (3); The buffer plate (3) has several through holes (301); A sealing gasket (401) is provided on the inner side of the sealing sleeve (4). The sealing gasket (401) is tightly attached to the valve core (2); The pressure relief mechanism (5) includes a fixed sleeve (501) located inside the valve body (1); The sealing sleeve (4) near the fixed sleeve (501) is provided with several guide rods (502); The fixed sleeve (501) has several guide holes on the side near the sealing sleeve (4), and the guide block is provided with a first spring (503). The guide rod (502) slides into the interior of the guide hole and abuts against the first spring (503).

2. The low-temperature resistant regulating valve according to claim 1, characterized in that: The bottom of the valve core (2) is provided with a positioning shaft (202), and the top of the valve core (2) is provided with a valve stem (201). The valve body (1) is provided with a handle (102) at the top, and the handle (102) is connected to the valve stem (201).

3. The low-temperature resistant regulating valve according to claim 1, characterized in that: The sealing sleeve (4) near the fixed sleeve (501) is slidably connected to the valve body (1).

4. The low-temperature resistant regulating valve according to claim 1, characterized in that: The pressure relief mechanism (5) includes a connecting hole (505) located inside the valve body (1), and the connecting hole (505) communicates with the valve cavity (203); The valve body (1) is provided with a discharge hole (506). One end of the discharge hole (506) is connected to the discharge end of the valve body (1), and the other end is connected to the connection hole (505). A sealing plug (507) is slidably connected inside the valve body (1); One end of the sealing plug (507) extends into the interior of the connecting hole (505), and the other end is provided with a second spring (508).

5. The low-temperature resistant regulating valve according to claim 1, characterized in that: Both ends of the valve body (1) are provided with connecting sleeves (101); The connecting sleeve (101) is equipped with a connecting mechanism.

6. The low-temperature resistant regulating valve according to claim 5, characterized in that: The connecting mechanism includes a positioning tube (602) fixed inside the valve body (1), and a connecting cavity is formed between the positioning tube (602) and the connecting sleeve (101). The connecting cavity is used to connect the outer pipe (601). The outer side of the outer tube (601) and the inner side of the connecting sleeve (101) are threaded, and the outer tube (601) is threadedly connected to the connecting sleeve (101).

7. A low-temperature resistant regulating valve according to claim 6, characterized in that: The end of the outer tube (601) is provided with a stabilizing ring (603), and the inner side of the stabilizing ring (603) is a conical surface; The positioning tube (602) is provided with a positioning ring (604) on its outer periphery, and the outer periphery of the positioning ring (604) is a conical surface; The positioning ring (604) is adapted to the stabilizing ring (603).

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