A stop valve

Abstract

The application provides a stop valve, which comprises a valve body, a valve rod and a check ring. The valve body has a valve port and a limiting groove. The valve rod is movably arranged in the valve body to abut against or separate from the valve port. The valve rod has a first end face away from the valve port. An edge of the first end face is formed with an abutting portion. At least part of the check ring is arranged in the limiting groove. When the valve rod is in a fully open state, the check ring abuts against the abutting portion. The valve rod and the check ring are made of the same material. The abutting portion has an abutting inclined surface for abutting against the check ring. An included angle between the abutting inclined surface and a plane where the first end face is located is α, and 40°≤α≤65° is satisfied. The technical scheme provided by the application can improve the limiting effect of the abutting portion of the valve rod and the check ring, and reduce the risk of the valve rod being pulled out of the check ring.

Description

Technical Field

[0001] This application relates to the field of gate valve technology, and more specifically, to a gate valve. Background Technology

[0002] A shut-off valve is an important component in air conditioning or other refrigeration systems that connects the indoor and outdoor units. During installation and maintenance, the shut-off valve can be used to open or close the connecting pipes between the indoor and outdoor units.

[0003] The valve stem and body of the gate valve are threaded together, and the opening and closing of the gate valve is controlled by operating an Allen wrench. When the valve stem is fully open, a retaining ring located in the valve body restricts the movement of the valve stem, thus limiting its movement. However, during the use of the gate valve, it is difficult to avoid situations where excessive force is applied to open the valve stem due to operational reasons, posing a risk that the valve stem may dislodge from the retaining ring. Utility Model Content

[0004] This application provides a shut-off valve that improves the limiting effect between the valve stem's abutment portion and the retaining ring, reducing the risk of the valve stem dislodging from the retaining ring.

[0005] This application is achieved through the following technical solution: This application provides a shut-off valve, which includes a valve body, a valve stem, and a retaining ring. The valve body has a valve port and a limiting groove. The valve stem is movably disposed within the valve body to abut against the valve port or to separate from the valve port. The valve stem has a first end face away from the valve port, and an abutment portion is formed on the edge of the first end face. At least a portion of the retaining ring is disposed within the limiting groove, and when the valve stem is in the fully open state, the retaining ring abuts against the abutment portion. The valve stem and the retaining ring are made of the same material, and the abutment portion has an abutment inclined surface for abutting against the retaining ring. The angle between the abutment inclined surface and the plane containing the first end face is α, satisfying: 40°≤α≤65°.

[0006] In the technical solution of this application embodiment, after the valve stem's abutting inclined surface contacts the retaining ring, when the valve stem continues to increase the tightening torque in the opening direction, because the valve stem and the retaining ring are made of the same material and have similar hardness, the valve stem's abutting inclined surface is not prone to wear and deformation due to being scraped and deformed by the retaining ring.

[0007] Furthermore, by limiting the angle α between the abutting slope of the valve stem's abutment portion and the plane containing the first end face to 40°-65°, the retaining ring is less likely to detach from the limiting groove. The retaining ring provides good limiting strength to the abutment portion of the valve stem and ensures that the thickness h of the upper side of the mounting groove for the O-ring on the valve stem is sufficiently large, preventing deformation and collapse under pressure, which could cause the valve stem to detach from the retaining ring. Specifically, if the angle α is less than 40°, the retaining ring is more likely to detach from the limiting groove, increasing the risk of detachment. With the total height H above the mounting groove remaining constant, an excessively large angle α can lead to insufficient h, posing a risk of deformation and collapse under pressure, causing the valve stem to detach from the retaining ring. Therefore, from an economic perspective, it is not recommended that the angle α exceed 65° unless the aforementioned H value is increased. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 Cross-sectional views of shut-off valves provided in some embodiments of this application; Figure 2 for Figure 1 Enlarged diagram of A in the middle; Figure 3 for Figure 2 A schematic diagram of the force analysis after the middle abutment part and the retaining ring abut against each other; Figure 4 for Figure 2 A schematic diagram of the structure after removing the retaining ring; Figure 5 This is a schematic diagram of the structure of the retaining ring in a gate valve provided in some embodiments of this application.

[0010] Icons: 100-Stop valve; 10-Valve body; 11-Valve port; 12-Limiting groove; 121-First groove sidewall; 122-First groove bottomwall; 123-Second groove sidewall; 13-First flow channel; 14-Second flow channel; 15-First valve chamber; 16-Third flow channel; 17-Match clearance; 20-Valve stem; 21-First end face; 22-Abutting part; 221-Abutting inclined surface; 222-First transition surface; 223-Second transition surface; 23-Mounting groove; 231-Third groove sidewall; 232-Second groove bottomwall; 233-Fourth groove sidewall; 24-First edge; 30-Retaining ring; 31-Notch; 40-First sealing ring; 50-Valve core; 60-Valve cap. Detailed Implementation

[0011] To make this application clearer, specific embodiments are described below with reference to the accompanying drawings: Please refer to Figures 1 to 5 The shut-off valve 100 includes a valve body 10, a valve stem 20, and a retaining ring 30. The valve body 10 has a valve port 11 and a limiting groove 12. The valve stem 20 is movably disposed within the valve body 10 to abut against the valve port 11 or to separate from the valve port 11. The valve stem 20 has a first end face 21 away from the valve port 11, and an abutment portion 22 is formed on the edge of the first end face 21. At least a portion of the retaining ring 30 is disposed within the limiting groove 12. When the valve stem 20 is in the fully open state, the retaining ring 30 abuts against the abutment portion 22. The valve stem 20 and the retaining ring 30 are made of the same material. The abutment portion 22 has an abutment inclined surface 221 for abutting against the retaining ring 30. The angle between the abutment inclined surface 221 and the plane containing the first end face 21 is α, satisfying: 40°≤α≤65°.

[0012] The valve stem 20 is movably disposed within the valve body 10 to abut against or separate from the valve port 11. This means that the abutment or separation of the valve stem 20 from the valve port 11 enables the opening or closing of the internal flow channel of the valve body 10. When the valve stem 20 abuts against the valve port 11, the internal flow channel of the valve body 10 is closed; when the valve stem 20 separates from the valve port 11, the internal flow channel of the valve body 10 is opened.

[0013] The retaining ring 30 is a blocking component provided on the inner wall of the valve body 10 to block the valve stem 20. The limiting groove 12 in the valve body 10 allows the retaining ring 30 to be installed. The first end face 21 is the end face of the valve stem 20 that is axially away from the valve port 11. The abutment part 22 is the abutment structure on the valve stem 20 located at the outer edge of the first end face 21 and abutting against the retaining ring 30. When the valve stem 20 is in the fully open state, the valve stem 20 abuts against the retaining ring 30 through the abutment part 22, and the retaining ring 30 provides a blocking effect to the abutment part 22. When the valve stem 20 continues to rotate in the opening direction, the retaining ring 30 can prevent the valve stem 20 from moving away from the valve port 11, thus limiting and blocking the valve stem 20 and reducing the risk of the valve stem 20 coming off the valve body 10.

[0014] When the valve stem 20 is in the fully open state, it means that the valve stem 20 is at the farthest position away from the valve port 11. When the valve stem 20 is in this position, the valve stem 20 is separated from the valve port 11, the flow channel inside the valve body 10 is in a conductive state, and the abutting inclined surface 221 of the valve stem 20 abuts against the retaining ring 30. The retaining ring 30 prevents the valve stem 20 from continuing to move away from the valve port 11.

[0015] The valve stem 20 and the retaining ring 30 are made of the same material. For example, the valve stem 20 and the retaining ring 30 can be made of stainless steel, so the valve stem 20 and the retaining ring 30 have the same hardness.

[0016] The inclined surface 221 refers to the surface where the abutment part 22 is located. The inclined surface 221 is inclined relative to the first end face 21, hence the name inclined surface 221. The inclined surface 221 also refers to the surface where the abutment part 22 of the valve stem 20 contacts the retaining ring 30. The setting of the inclined surface 221 of the abutment part 22 can decompose the force between the abutment part 22 and the retaining ring 30 into a horizontal component and a vertical component.

[0017] Specifically, please combine Figure 2 and Figure 3 When the abutment portion 22 of the valve stem 20 abuts against the retaining ring 30, the force exerted by the abutment inclined surface 221 of the abutment portion 22 on the retaining ring 30 is dF. Decomposing dF axially and circumferentially yields sinα·dF and cosα·dF. The circumferential force sinα·dF acts on the bottom wall of the limiting groove 12 of the valve body 10, while the axial force cosα·dF acts on the side wall of the limiting groove 12 of the valve body 10. As the tightening torque is continuously increased in the opening direction of the valve stem 20, the side wall of the limiting groove 12 of the valve body 10 tends to gradually indent and deform under the action of the axial force cosα·dF, while the retaining ring 30 tends to detach from the limiting groove 12; conversely, the circumferential force sinα·dF prevents the retaining ring 30 from detaching from the limiting groove 12. Since cosα·dF decreases and sinα·dF increases in the 0°-90° range... Therefore, the smaller the included angle α, the more significant the tendency of the retaining ring 30 to disengage from the limiting groove 12; conversely, the larger the included angle α, the less likely the retaining ring 30 is to disengage from the limiting groove 12.

[0018] It should be noted that when the valve stem 20 and the retaining ring 30 are made of different materials, for example, when the valve stem 20 is made of brass and the retaining ring 30 is made of stainless steel, because the hardness of brass is less than that of stainless steel, regardless of the inclination angle of the abutting slope 221 of the valve stem 20's abutting part 22, after repeated friction and contact between the valve stem 20 and the retaining ring 30, the abutting slope 221 of the valve stem 20 will always be worn down by the retaining ring 30 due to the lower hardness of the valve stem 20. This will cause the abutting slope 221 of the abutting part 22 to be squeezed and scraped by the retaining ring 30 into an arc surface. Therefore, when the valve stem 20 is made of brass, the angle of the abutting slope 221 of the abutting part 22 of the valve stem 20 is not important, because the abutting slope 221 of the abutting part 22 of the valve stem 20 will always be worn down by the retaining ring 30 into an arc surface, and the risk of the valve stem 20 coming out of the retaining ring 30 is relatively high.

[0019] In the technical solution of this application embodiment, the retaining ring 30 is disposed in the limiting groove 12 of the valve body 10. After the valve stem 20 is in the fully open state, the retaining ring 30 can hold and limit the abutment portion 22 of the valve stem 20. If the tightening torque continues to increase in the opening direction of the valve stem 20, the retaining ring 30 restricts the valve stem 20 from continuing to move away from the valve port 11, preventing the valve stem 20 from coming out of the valve body 10. After the abutment slope 221 of the valve stem 20 contacts the retaining ring 30, if the tightening torque continues to increase in the opening direction of the valve stem 20, since the valve stem 20 and the retaining ring 30 are made of the same material and have similar hardness, the abutment slope 221 of the valve stem 20 is not easily scratched or deformed by the retaining ring 30, thus preventing wear and deformation.

[0020] Furthermore, by limiting the angle α between the abutting inclined surface 221 of the valve stem 20's abutting portion 22 and the plane containing the first end face 21 to 40°-65°, the retaining ring 30 is less likely to detach from the limiting groove 12. The retaining ring 30 provides good limiting strength to the abutting portion 22 of the valve stem 20, and ensures that the thickness h of the upper side of the mounting groove 23 on the valve stem 20 for O-ring installation is sufficiently large to prevent deformation and collapse of this part under pressure, thus preventing the valve stem 20 from detaching from the retaining ring 30. Specifically, if the angle α is less than 40°, the retaining ring 30 is more likely to detach from the limiting groove 12, and the risk of the retaining ring 30 detaching from the limiting groove 12 is greater. If the total height H above the groove of the mounting groove 23 remains unchanged, an excessively large angle of α will result in an insufficient h value, which may cause the part to deform and collapse under pressure, causing the valve stem 20 to detach from the retaining ring 30. Therefore, from an economic point of view, it is not recommended that the angle of α exceed 65° unless the above-mentioned H value is increased.

[0021] It needs to be explained here that the O-ring mentioned above refers to the first sealing ring 40 set between the outer peripheral wall of the valve stem 20 and the inner wall of the valve body 10, while the mounting groove 23 refers to the groove structure on the valve stem 20 for mounting the O-ring. To better understand the h value and H value, specifically, the mounting groove 23 includes a third groove side wall 231, a second groove bottom wall 232, and a fourth groove side wall 233. The third groove side wall 231 and the fourth groove side wall 233 are respectively connected to the two ends of the second groove bottom wall 232. The third groove side wall 231 is closer to the abutment slope 221 than the fourth groove side wall 233. The abutment slope 221 intersects with the outer peripheral wall of the valve stem 20 to form a first edge 24. The H value refers to the distance between the third groove side wall 231 and the first end face 21, and the h value refers to the distance between the first edge 24 and the third groove side wall 231.

[0022] According to some embodiments of this application, 43°≤α≤50°.

[0023] The included angle α can be selected within the range of 43°-50°. For example, the angle of α can be any value such as 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, etc. The specific angle of α can be determined according to the actual situation.

[0024] Choosing an angle α of 43°-50° prevents the retaining ring 30 from easily detaching from the limiting groove 12. The retaining ring 30 provides good limiting strength to the abutment portion 22 of the valve stem 20 and ensures the valve stem 20 has a sufficient h value, reducing the risk of thread failure between the valve stem 20 and the valve body 10. If the angle α is greater than 43°, the retaining ring 30 is more likely to detach from the limiting groove 12, increasing the risk of detachment. If the angle α is greater than 50°, the h value of the valve stem 20 is smaller, making thread failure between the valve stem 20 and the valve body 10 more likely.

[0025] According to some embodiments of this application, please refer to Figure 4 The limiting groove 12 includes a first groove sidewall 121, a first groove bottom wall 122, and a second groove sidewall 123 connected in sequence. The first groove sidewall 121 is closer to the valve port 11 than the second groove sidewall 123. The angle between the first groove sidewall 121 and the first groove bottom wall 122 is an obtuse angle, and the angle between the second groove sidewall 123 and the first groove bottom wall 122 is a right angle.

[0026] The first groove sidewall 121 and the second groove sidewall 123 are respectively connected to the two ends of the bottom wall 122 of the first groove, and the first groove sidewall 121 and the second groove sidewall 123 constitute the two groove sidewalls of the limiting groove 12. The first groove sidewall 121 is closer to the valve port 11 than the second groove sidewall 123, which means that the distance between the first groove sidewall 121 and the valve port 11 is smaller than the distance between the second groove sidewall 123 and the valve port 11.

[0027] The limiting groove 12 includes a first groove sidewall 121, a first groove bottom wall 122, and a second groove sidewall 123. When the abutment portion 22 of the valve stem 20 abuts against the retaining ring 30, the second groove sidewall 123 can provide a blocking effect for the retaining ring 30, preventing the retaining ring 30 from coming out of the limiting groove 12. Therefore, the angle between the second groove sidewall 123 and the first groove bottom wall 122 is a right angle, that is, the second groove sidewall 123 is perpendicularly connected to the first groove bottom wall 122. The second groove sidewall 123 can better provide a blocking effect for the retaining ring 30, preventing the retaining ring 30 from coming out of the limiting groove 12. The angle between the first groove sidewall 121 and the first groove bottom wall 122 is an obtuse angle, that is, the opening of the limiting groove 12 gradually increases from the end of the first groove sidewall 121 and the first groove bottom wall 122 to the other end of the first groove sidewall 121, which can meet the manufacturing tolerance of the retaining ring 30 and facilitate the assembly of the retaining ring 30.

[0028] According to some embodiments of this application, please refer to Figure 4 The abutting part 22 also includes a first transition surface 222, and the abutting inclined surface 221 is connected to the first end face 21 through the first transition surface 222; the angle between the first transition surface 222 and the first end face 21 is a right angle.

[0029] The first transition surface 222 refers to the wall surface disposed between the abutment inclined surface 221 and the first end face 21. The angle between the first transition surface 222 and the first end face 21 is a right angle, that is, the first transition surface 222 is perpendicularly connected to the first end face 21. It can be understood that the first transition surface 222 is parallel to the bottom wall 122 of the first groove. When the valve stem 20 is in the fully open state, the outer peripheral surface of the retaining ring 30 is in line contact with the bottom wall 122 of the first groove, while the first transition surface 222 is located on one side of the inner peripheral surface of the retaining ring 30. The first transition surface 222 can play a certain limiting and blocking role on one side of the inner peripheral surface of the retaining ring 30.

[0030] By providing a first transition surface 222 between the abutting inclined surface 221 and the first end face 21, and the angle between the first transition surface 222 and the first end face 21 being a right angle, when the abutting inclined surface 221 of the valve stem 20 abuts against a portion of the inner circumferential surface of the retaining ring 30, and when the retaining ring 30 has a tendency to detach towards the side away from the bottom wall 122 of the first groove, the first transition surface 222 can provide a blocking effect for the retaining ring 30 towards the first groove side wall 121 of the limiting groove 12, preventing the retaining ring 30 from detaching from the limiting groove 12.

[0031] Based on some embodiments of this application, please continue to refer to Figure 4 The abutment part 22 also includes a second transition surface 223, which is disposed between the first transition surface 222 and the first end face 21. The angle between the second transition surface 223 and the first end face 21 is an obtuse angle. The second transition surface 223 facilitates deburring during the processing of the valve stem 20.

[0032] According to some embodiments of this application, the valve stem 20 and the retaining ring 30 are both made of stainless steel, and the valve body 10 is made of brass or stainless steel.

[0033] The valve stem 20 and the retaining ring 30 are both made of stainless steel, meaning that the valve stem 20 and the retaining ring 30 are both stainless steel parts. The valve body 10 is made of brass or stainless steel, meaning that the valve body 10 is made of brass or stainless steel parts.

[0034] Brass is an alloy of copper and zinc, while stainless steel is composed of iron, chromium, nickel, and other alloying elements.

[0035] When the valve stem 20 and retaining ring 30 are made of stainless steel, the material cost of the valve stem 20 is lower than that of brass, thus reducing the manufacturing cost of the gate valve 100. The valve body 10 can be made of either brass or stainless steel. For example, using brass results in superior corrosion resistance and sealing performance, making it suitable for applications involving high temperature, high pressure, or corrosive media. Using stainless steel, however, reduces costs and is suitable for low temperature and low pressure applications, such as systems transporting water, steam, or oil. The material of the valve stem 20 can be chosen based on specific requirements, offering greater flexibility.

[0036] According to some embodiments of this application, please refer to Figure 5 The retaining ring 30 is a semi-closed structure, and a notch 31 is formed in the retaining ring 30 along the circumference.

[0037] The retaining ring 30 has a semi-closed structure, meaning that along its circumference, the retaining ring 30 is not annular; it is broken in the circumferential direction, forming a notch 31. The notch 31 creates a break in the circumferential region of the retaining ring 30, and two break end faces are formed at both ends of the notch 31. For example, the retaining ring 30 can be C-shaped.

[0038] The retaining ring 30 is made into a semi-closed structure, which makes it easier to deform the retaining ring 30 by squeezing it during assembly, so that the retaining ring 30 can be assembled into the limiting groove 12 of the valve body 10.

[0039] Specifically, when assembling the retaining ring 30, the notch 31 of the retaining ring 30 can be squeezed and deformed, reducing the distance between the two end faces of the notch 31 of the retaining ring 30, thereby reducing the outer diameter of the retaining ring 30. This makes it easier for the retaining ring 30 to be installed into the limiting groove 12 from the opening of the first valve chamber 15 of the valve body 10. After the retaining ring 30 is installed in the limiting groove 12, the retaining ring 30 is reset and locked in the limiting groove 12.

[0040] Based on some embodiments of this application, please refer to... Figure 3 and Figure 4 The valve body 10 has a fitting gap 17 between its inner wall and the outer peripheral wall of the valve stem 20; the stop valve also includes a first sealing ring 40, which is disposed on the valve stem 20 and is used to seal the fitting gap 17.

[0041] The valve body 10 has a fitting clearance 17 between its inner wall and the valve stem 20's outer peripheral wall, which means that there is a certain gap between the outer peripheral wall of the valve stem 20 and the inner wall of the valve body 10 along the radial direction of the valve stem 20.

[0042] The first sealing ring 40 refers to the sealing element set between the valve stem 20 and the inner wall of the valve body 10. The material of the first sealing ring 40 can be rubber, plastic, polytetrafluoroethylene, or hard alloy, etc. The specific material of the first sealing ring 40 can be determined according to the actual situation.

[0043] The first sealing ring 40 can be directly set on the outer peripheral wall of the valve stem 20, or an annular mounting groove 23 can be provided on the outer peripheral wall of the valve stem 20, and the first sealing ring 40 can be installed in the mounting groove 23. The specific setting method of the first sealing ring 40 can be determined according to the actual situation.

[0044] The number of first sealing rings 40 can be one or more. When there are multiple first sealing rings 40, the multiple first sealing rings 40 are distributed at intervals along the axial direction of the valve stem 20. The specific number of first sealing rings 40 can be determined according to the actual situation.

[0045] In this embodiment, the number of first sealing rings 40 is one.

[0046] By providing a first sealing ring 40 on the valve stem 20, and the first sealing ring 40 being located at the fitting gap 17 between the valve stem 20 and the inner wall of the valve body 10, the first sealing ring 40 can seal the fitting gap 17, preventing the medium inside the valve body 10 from leaking from the fitting gap 17 between the valve stem 20 and the inner wall of the valve body 10, thus ensuring the sealing performance inside the valve body 10.

[0047] According to some embodiments of this application, a mounting groove 23 is provided on the outer peripheral wall of the valve stem 20, and at least a portion of the first sealing ring 40 is located in the mounting groove 23.

[0048] The mounting groove 23 refers to the groove structure provided on the valve stem 20 for mounting the first sealing ring 40. The mounting groove 23 is an annular groove extending along the outer periphery of the valve stem 20. A portion of the first sealing ring 40 is located inside the mounting groove 23, and a portion of the first sealing ring 40 protrudes radially out of the mounting groove 23 and makes sealing contact with the inner wall of the valve body 10.

[0049] By providing an installation groove 23 on the valve stem 20, which accommodates at least a portion of the first sealing ring 40 and provides a limiting function for the first sealing ring 40, the first sealing ring 40 and the valve stem 20 will not have relative movement in the axial direction of the valve stem 20, thus improving the stability of the first sealing ring 40 installed on the valve stem 20.

[0050] Based on some embodiments of this application, please refer to... Figure 3 and Figure 4The mounting groove 23 includes a third groove sidewall 231, a second groove bottom wall 232, and a fourth groove sidewall 233. The third groove sidewall 231 and the fourth groove sidewall 233 are respectively connected to the two ends of the second groove bottom wall 232. The third groove sidewall 231 is closer to the abutment slope 221 than the fourth groove sidewall 233. The abutment slope 221 intersects with the outer peripheral wall of the valve stem 20 to form a first edge 24. The distance between the first edge 24 and the third groove sidewall 231 is h, which satisfies: 0.5mm≤h≤1.5mm.

[0051] The third groove sidewall 231 and the fourth groove sidewall 233 are respectively connected to the two ends of the bottom wall 232 of the second groove, and the third groove sidewall 231 and the fourth groove sidewall 233 respectively form the two groove sidewalls of the mounting groove 23. The third groove sidewall 231 is closer to the abutting inclined surface 221 than the fourth groove sidewall 233, meaning that the distance between the third groove sidewall 231 and the abutting inclined surface 221 is smaller than the distance between the fourth groove sidewall 233 and the abutting inclined surface 221. The abutting inclined surface 221 intersects with the outer peripheral wall of the valve stem 20 to form the first edge 24, which refers to the edge of the abutting inclined surface 221 near the outer peripheral wall of the valve stem 20.

[0052] Limiting the h value to 0.5mm-1.5mm ensures sufficient thickness between the first edge 24 and the third groove sidewall 231 on the valve stem 20, preventing deformation and collapse under pressure and reducing the risk of the valve stem 20 detaching from the retaining ring 30. This also saves material and reduces material costs. If the h value is less than 0.5mm, the area between the first edge 24 and the third groove sidewall 231 is prone to deformation under pressure, increasing the risk of the valve stem 20 detaching from the retaining ring 30. Conversely, if the h value is greater than 1.5mm, the area between the first edge 24 and the third groove sidewall 231 becomes too thick, resulting in material waste and increasing the material cost of the valve stem 20.

[0053] According to some embodiments of this application, the diameter of the cross-section of the retaining ring 30 is R, and the depth of the limiting groove 12 is L, satisfying 1 / 2≤L / R≤3 / 4.

[0054] By limiting the L / R ratio to 1 / 2-3 / 4, it is possible to ensure that the retaining ring 30 is securely installed in the limiting groove 12, preventing it from easily detaching, while also providing good blocking effect for the abutment part 22 of the valve stem 20, thus preventing the valve stem 20 from moving. If L / R is less than 1 / 2, the depth of the retaining ring 30 embedded in the limiting groove 12 is small, making it easy for the retaining ring 30 to detach from the limiting groove 12. Conversely, if L / R is greater than 3 / 4, the amount of the retaining ring 30 protruding from the limiting groove 12 is small, making it easy for the valve stem 20 to detach from the retaining ring 30, resulting in the valve stem 20 detaching.

[0055] In some embodiments, please refer to Figure 1 and Figure 2 The valve body 10 has a first flow channel 13, a second flow channel 14 and a first valve cavity 15 that are interconnected. The first flow channel 13 is connected to the second flow channel 14 through the valve port 11. A part of the valve stem 20 is disposed in the first valve cavity 15 and the valve stem 20 is threadedly engaged with the cavity wall of the first valve cavity 15.

[0056] The first valve chamber 15 refers to the chamber that accommodates the valve stem 20. The valve body 10 has a first flow channel 13, a second flow channel 14 and a first valve chamber 15 that are interconnected. This means that the first flow channel 13, the second flow channel 14 and the first valve chamber 15 are interconnected. The valve port 11 is located at the intersection of the first flow channel 13, the second flow channel 14 and the first valve chamber 15 within the valve body 10.

[0057] The valve stem 20 is threadedly engaged with the cavity wall of the first valve chamber 15 of the valve body 10. The outer peripheral wall of the valve stem 20 is provided with an external thread, and the cavity wall of the valve body 10 is provided with an internal thread. By rotating the valve stem 20, the valve stem 20 can move within the valve body 10 to achieve the connection or disconnection between the first flow channel 13 and the second flow channel 14.

[0058] by Figure 1 Taking the orientation shown as an example, the axis of the first flow channel 13 extends horizontally, the axis of the second flow channel 14 extends vertically, the first valve chamber 15 is disposed opposite to the second flow channel 14, and the axis of the first valve chamber 15 also extends vertically. The valve stem 20 can move vertically within the first valve chamber 15 to abut against or separate from the valve port 11. Figure 1 The illustrated state is with valve stem 20 away from valve port 11 and valve stem 20 fully open. In this state, the first flow channel 13 is connected to the second flow channel 14 through valve port 11. However, when valve stem 20 moves vertically downwards to abut against valve port 11, the connection between the first flow channel 13 and the second flow channel 14 is severed, and refrigerant cannot flow between the first flow channel 13 and the second flow channel 14.

[0059] The gate valve 100 also includes a valve cap 60, which is threaded onto the valve body 10. After the valve cap 60 is tightened onto the valve body 10, the opening end of the first valve chamber 15 is sealed. The main body of the valve cap 60 is generally a hexagonal prism structure to facilitate the use of tools such as wrenches. The valve cap 60 is easier and quicker to disassemble and assemble, which facilitates the subsequent maintenance of the gate valve 100.

[0060] In some embodiments, please refer to Figure 1The shut-off valve 100 may also include a valve core 50, and the valve body 10 may also include a third flow channel 16, which is disposed opposite to the first flow channel 13 and adjacent to the first valve chamber 15. The valve core 50 is disposed in the third flow channel 16 and can be used to unidirectionally charge refrigerant into the valve body 10.

[0061] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A shut-off valve, characterized in that, include: The valve body (10) has a valve port (11) and a limiting groove (12); The valve stem (20) is movably disposed within the valve body (10) to abut against the valve port (11) or separate from the valve port (11); the valve stem (20) has a first end face (21) away from the valve port (11), and an abutment portion (22) is formed on the edge of the first end face (21). The retaining ring (30) is at least partially disposed in the limiting groove (12), and when the valve stem (20) is in the fully open state, the retaining ring (30) abuts against the abutting part (22); The valve stem (20) and the retaining ring (30) are made of the same material. The abutting part (22) has an abutting inclined surface (221) for abutting against the retaining ring (30). The angle between the abutting inclined surface (221) and the plane containing the first end face (21) is α, which satisfies: 40°≤α≤65°.

2. The shut-off valve according to claim 1, characterized in that, 43°≤α≤50°。 3. The shut-off valve according to claim 1, characterized in that, The limiting groove (12) includes a first groove sidewall (121), a first groove bottom wall (122), and a second groove sidewall (123) connected in sequence. The first groove sidewall (121) is closer to the valve port (11) than the second groove sidewall (123). The angle between the first groove sidewall (121) and the first groove bottom wall (122) is an obtuse angle, and the angle between the second groove sidewall (123) and the first groove bottom wall (122) is a right angle.

4. The shut-off valve according to claim 1, characterized in that, The abutting part (22) further includes a first transition surface (222), and the abutting inclined surface (221) is connected to the first end face (21) through the first transition surface (222); the angle between the first transition surface (222) and the first end face (21) is a right angle.

5. The shut-off valve according to claim 1, characterized in that, The valve stem (20) and the retaining ring (30) are both made of stainless steel, and the valve body (10) is made of brass or stainless steel.

6. The shut-off valve according to claim 1, characterized in that, The retaining ring (30) is a semi-closed structure, and a notch (31) is formed in the retaining ring (30) along the circumference.

7. The shut-off valve according to claim 1, characterized in that, There is a fitting clearance (17) between the inner wall of the valve body (10) and the outer peripheral wall of the valve stem (20). The shut-off valve (100) further includes a first sealing ring (40), which is disposed on the valve stem (20) and is used to seal the mating gap (17).

8. The shut-off valve according to claim 7, characterized in that, The valve stem (20) has an installation groove (23) on its outer peripheral wall, and at least a portion of the first sealing ring (40) is located in the installation groove (23).

9. The shut-off valve according to claim 8, characterized in that, The mounting groove (23) includes a third groove sidewall (231), a second groove bottom wall (232), and a fourth groove sidewall (233). The third groove sidewall (231) and the fourth groove sidewall (233) are respectively connected to the two ends of the second groove bottom wall (232). The third groove sidewall (231) is closer to the abutting inclined surface (221) than the fourth groove sidewall (233). The abutting inclined surface (221) intersects with the outer peripheral wall of the valve stem (20) to form a first edge (24). The distance between the first edge (24) and the third groove sidewall (231) is h, which satisfies: 0.5mm≤h≤1.5mm.

10. The shut-off valve according to claim 1, characterized in that, The diameter of the cross-section of the retaining ring (30) is R, and the depth of the limiting groove (12) is L, satisfying: 1 / 2≤L / R≤3 / 4.

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