A large capacity cryogenic regulating valve

Abstract

The application discloses a large-capacity cryogenic regulating valve and belongs to the technical field of valves. The large-capacity cryogenic regulating valve comprises a valve body, has a cavity in the interior, is provided with a medium inlet and a medium outlet at one end, the axis of the medium outlet intersects with the axis of the medium inlet, a valve core assembly comprises a valve core slidingly arranged in the cavity and used for adjusting the flow size between the medium inlet and the medium outlet, and a guiding mechanism is arranged between the valve core and the valve body and used for guiding the valve core to move along the axial direction of the valve body. The large-capacity cryogenic regulating valve has the guiding and limiting effect when the valve core moves, limits the movement of the valve core along the axial direction of the valve body, improves the stability of the valve core of the regulating valve and improves the movement precision of the valve core of the regulating valve.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically, it relates to a large-capacity cryogenic regulating valve. Background Technology

[0002] In existing technology, a regulating valve, also known as a control valve, is a final control element in the field of industrial automation process control. It receives control signals from a regulating control unit and uses power to change process parameters such as the flow rate, pressure, temperature, and liquid level of the working fluid. It generally consists of an actuator and a valve body. Regulating valves can be classified according to their driving method: manual regulating valves, pneumatic regulating valves, electric regulating valves, and hydraulic regulating valves. Specifically, pneumatic regulating valves use compressed air as a power source, electric regulating valves use electricity as a power source, and hydraulic regulating valves use the pressure of a liquid working fluid (such as oil) as power.

[0003] For cryogenic media such as liquid hydrogen, liquid oxygen, and liquid nitrogen, cryogenic pneumatic control valves are commonly used. They are the most commonly used control devices in large cryogenic refrigeration equipment and the most important actuators for regulating thermodynamic parameters such as flow rate and pressure of cryogenic working fluids in process control.

[0004] Existing cryogenic control valves have one end of the valve stem connected to a pneumatic actuator, and the other end passing through the valve cover and placed in the valve seat. The pneumatic actuator regulates the flow rate of the valve seat by controlling the displacement of the valve stem. In this process, due to the large total length of the valve stem, the accuracy of the reciprocating motion cannot be guaranteed, and large radial runout is easily generated, which affects the movement accuracy of the valve core and is not suitable for use in ultra-low temperature environments.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a large-capacity cryogenic control valve. By setting a guide mechanism between the valve core and the valve body, the valve core moves and is guided and limited, restricting the movement of the valve core along the axis of the valve body, thereby improving the stability of the valve core and the movement accuracy of the valve core.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0008] A high-capacity cryogenic regulating valve, including

[0009] The valve body has an internal cavity and a medium inlet and a medium outlet at one end, wherein the axis of the medium outlet intersects the axis of the medium inlet;

[0010] A valve core assembly, including a valve core slidably disposed within the cavity, is used to adjust the flow rate between the medium inlet and the medium outlet;

[0011] A guide mechanism is provided between the valve core and the valve body to guide the valve core to move along the axial direction of the valve body.

[0012] Furthermore, the guide mechanism is disposed at one end of the valve core near the medium inlet;

[0013] Alternatively, the guide mechanism may be located at the end of the valve core furthest from the medium inlet.

[0014] Furthermore, the guiding mechanism includes a guide member and a mating member, which are correspondingly disposed on the valve core and the valve body, respectively. The guide member and the mating member cooperate with each other to slide along the axial direction of the valve body.

[0015] Preferably, the guide mechanism is located between the end of the valve core near the medium outlet and the medium inlet and the inner peripheral wall of the valve body.

[0016] Furthermore, the valve core includes

[0017] A regulating valve core, located at one end of the valve core, is used to regulate the flow rate between the medium inlet and the medium outlet when the valve core is moved.

[0018] The sliding end of the guide protrudes from the outer peripheral wall of the regulating valve core;

[0019] Preferably, one end of the guide is connected to the end face of the regulating valve core, and the other end extends toward the inner peripheral wall of the valve body and is slidably connected to the inner peripheral wall of the valve body.

[0020] Furthermore, the cavity includes

[0021] A pressure balancing chamber is located between the end of the valve core furthest from the medium inlet and the valve body;

[0022] The pressure balancing chamber is connected to the medium inlet through a connecting structure, and is used to balance the pressure at both ends of the valve core;

[0023] Preferably, the valve core assembly further includes

[0024] The valve stem has one end connected to the valve core and the other end passing through the pressure balance chamber and exiting the other end of the valve body, which is used to drive the valve core to move.

[0025] Furthermore, the connecting structure is disposed inside the valve body and extends through both ends of the valve core.

[0026] Furthermore, it also includes a split-joint structure, which is disposed on the other end of the valve core and detachably connected to the valve stem;

[0027] The connectivity structure includes

[0028] A pressure channel extends through both axial ends of the valve core;

[0029] A connecting channel is provided through the split joint structure, with one end connected to the pressure balance chamber and the other end connected to the pressure channel.

[0030] Furthermore, the pressure-feeding channel is a pressure-feeding tube;

[0031] The valve core also includes

[0032] A support core, wherein the support core and the regulating valve core are sequentially connected along the axial direction of the valve body;

[0033] The support core is disposed between the pressure-sensing tube and the inner peripheral wall of the valve body, and is used to provide support when the pressure-sensing tube moves;

[0034] Preferably, the support core is a heat-insulating support core;

[0035] Preferably, there are multiple support cores, which are arranged sequentially along the axial direction of the valve body, and there is a heat insulation chamber between adjacent support cores.

[0036] Furthermore, the cavity also includes

[0037] The valve body cavity is connected to both the medium inlet and the pressure balance chamber.

[0038] The centerline of the valve body cavity is eccentrically positioned relative to the centerline of the medium inlet, and the centerline of the valve body cavity is biased toward the medium outlet direction.

[0039] Furthermore, it also includes an anti-rotation mechanism, which is disposed on the valve body, and the valve core assembly is disposed on the anti-rotation mechanism and slidably connected to the anti-rotation mechanism;

[0040] The anti-rotation mechanism is used to limit the circumferential rotation of the valve core assembly.

[0041] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0042] 1. The large-capacity low-temperature regulating valve of the present invention, by setting a guide mechanism between the valve core and the valve body, plays a guiding and limiting role when the valve core moves, restricting the movement of the valve core along the valve body axis, thereby improving the stability of the valve core and the movement accuracy of the valve core.

[0043] 2. The large-capacity cryogenic regulating valve of the present invention, by setting a pressure balance chamber in the valve body and drawing pressure from the medium inlet through a connecting structure, ensures that the pressure in the pressure balance chamber and the medium inlet are equal, that is, balances the pressure at both ends of the valve core, effectively balances the force of the medium on the valve stem at the medium inlet, effectively reduces the sealing force required for the regulating valve to seal, reduces the output force requirement of the regulating valve on the pneumatic actuator, and at the same time helps to reduce the unbalanced force of the valve stem, reducing the risk of valve stem instability and reduced motion accuracy.

[0044] 3. The large-capacity cryogenic regulating valve of the present invention comprises a regulating valve core and a multi-segment thermally insulated support core, the thermally insulated support core being composed of a non-metallic material with a low thermal conductivity. Adjacent thermally insulated support cores are connected by threads, and a thermally insulated chamber is provided between adjacent thermally insulated support cores, thereby reducing the heat conduction area of ​​the intermediate connection. The thermally insulated support core helps to reduce the transfer of cold energy from the medium inlet to the upper part; at the same time, the thermally insulated support core provides support for the intermediate pressure tapping pipe, preventing the pressure rod from becoming unstable.

[0045] At the same time, the present invention has a simple structure, a concise method, and significant effects, making it suitable for widespread use.

[0046] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0047] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0048] Figure 1 This is a cross-sectional view of the large-capacity cryogenic regulating valve of the present invention;

[0049] Figure 2 This is a schematic diagram of the structure of the regulating valve core of the present invention;

[0050] Figure 3 This is the present invention. Figure 1 Enlarged view of point A in the middle;

[0051] Figure 4 This is the present invention. Figure 1 Enlarged view of point B in the middle;

[0052] Figure 5 This is the present invention. Figure 1 Enlarged view of point C in the middle.

[0053] In the diagram: 1. Valve body; 101. Cavity; 1011. Receiving cavity; 1012. Pressure balancing cavity; 102. Medium inlet; 103. Medium outlet; 104. Valve cover; 105. Extended neck of valve body; 106. Valve body cavity; 107. Inlet section; 108. Outlet section; 2. Valve stem; 201. Limiting groove; 3. Valve core; 301. Regulating valve core; 3011. Flow regulating profile; 302. Valve core body; 3021. Connecting part; 3022. Support core; 302 3. Pressure ring; 4. Guide mechanism; 401. Guide component; 402. Mating component; 5. Sealing seat; 6. Connecting structure; 61. Pressure channel; 62. Connecting channel; 7. Bellows; 8. O-ring; 9. Anti-rotation mechanism; 901. Fixing component; 902. Anti-rotation component; 10. Non-metallic sealing component; 11. Insulated chamber; 12. Split connector; 13. Mounting seat; 1301. First mounting part; 1302. Second mounting part; 14. Shielding component; 15. Coaxial sealing component.

[0054] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0056] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] The high-capacity cryogenic regulating valve of this invention is typically used in conjunction with a pneumatic actuator. By controlling the pneumatic actuator, the regulating valve controls the flow rate. The regulating valve and the pneumatic actuator are installed vertically, one above the other, with the pneumatic actuator positioned above the regulating valve.

[0059] like Figures 1 to 5 As shown, the large-capacity cryogenic regulating valve of the present invention includes a valve body 1, a valve core assembly, and a guide mechanism 4. The valve body 1 has an internal cavity 101, and one end of the valve body 1 has a medium inlet 102 and a medium outlet 103, both of which communicate with the cavity 101. The valve core assembly includes a valve core 3 slidably disposed within the cavity 101, used to regulate the flow rate between the medium inlet 102 and the medium outlet 103. The axis of the medium outlet 103 intersects the axis of the medium inlet 102. The guide mechanism 4 is disposed between the valve core 3 and the valve body 1, used to guide the valve core 3 to move along the axial direction of the valve body 1.

[0060] When the valve core 3 moves, the guide mechanism 4 plays a guiding and limiting role, guiding the valve core 3 to move along the axis of the valve body 1, thereby improving the stability of the valve core 3 of the regulating valve and improving the movement accuracy of the valve core 3 of the regulating valve.

[0061] In this embodiment, the valve core assembly also includes a valve stem 2. One end of the valve stem 2 is connected to the valve core 3, and the other end extends through the other end of the valve body 1, used to drive the valve core 3 to move. The valve core 3 is slidably disposed within the cavity 10), and the end of the valve core 3 near the medium inlet 102 can adjust the flow rate between the medium inlet 102 and the medium outlet 103. Of course, the actuator can also act directly on the valve core assembly. In this embodiment, the structure of the valve stem 2 and the valve core 3 is used as an example for explanation.

[0062] During installation, the pneumatic actuator is connected to the free end of the valve stem 2, and the pneumatic actuator drives the valve stem 2 to move. When the pneumatic actuator drives the valve stem 2 to move, the valve stem 2 accordingly drives the valve core 3 to move within the cavity 101. The volume between the medium inlet 102 and the medium outlet 103 can be controlled according to the different moving distances of the valve core 3. During the movement of the valve core 3, the guide mechanism 4 guides the valve core 3 to move along the axis of the valve body 1, improving the stability and movement accuracy of the valve core 3 in the regulating valve.

[0063] In this embodiment, the valve body 1 includes a valve cover 104, an extended neck 105, a valve body cavity 106, an inlet section 107, and an outlet section 108. The valve cover 104, extended neck 105, valve body cavity 106, and inlet section 107 are connected sequentially. The valve stem 2 passes through the valve cover 104, and the medium inlet 102 is located at the end of the inlet section 107 away from the valve body cavity 106. The outlet section 108 is connected to the side wall of the valve body cavity 106. The valve cover 104, extended neck 105, valve body cavity 106, and inlet section 107 form a cavity 101 for the valve core 3 to slide.

[0064] In this embodiment, the valve cover 104 is connected to the valve body extension neck 105 via a flange and fasteners (screws, bolts) to achieve a detachable connection of the valve cover 104. A sealing seat 5 is provided at the connection between the valve cover 104 and the valve stem 2 to improve sealing performance.

[0065] In this embodiment, the valve cover 104, the extended neck 105 of the valve body, and the inlet section 107 are coaxially arranged. The centerline of the valve body cavity 106 is eccentrically positioned with respect to the centerline of the medium inlet 102, and the centerline of the valve body cavity 106 is biased towards the medium outlet 103. This eccentric arrangement effectively reduces the flow resistance within the valve body 1 and increases the capacity of the control valve. With a fixed length for the inlet section 107 and the outlet section 108, a larger eccentricity has a greater effect on increasing the capacity of the control valve.

[0066] In this embodiment, the valve body extended neck 105, valve body cavity 106, inlet section 107 and outlet section 108 adopt a welded structure, and are precision machined after welding, which helps to improve the machining accuracy of the deep hole inside the valve body 1.

[0067] In this embodiment, the medium outlet 103 is located on one side of the medium inlet 102. The axis of the medium outlet 103 can be set at any angle with the axis of the medium inlet 102. Preferably, the axis of the medium outlet 103 is perpendicular to the axis of the medium inlet 102.

[0068] In this embodiment, both the inlet section 107 and the outlet section 108 adopt a tapered tube structure design. The diameter of the end of the inlet section 107 furthest from the valve body cavity 106 is smaller than the diameter of the end of the inlet section 107 closest to the valve body cavity 106, and the diameter of the end of the outlet section 108 furthest from the valve body cavity 106 is smaller than the diameter of the end of the outlet section 108 closest to the valve body cavity 106. The change trend can be gradual or step-like.

[0069] By using a tapered tube structure design, the medium inlet 102 and medium outlet 103 are ensured to meet the pipe size requirements of the control valve of this specification, while increasing the internal flow area of ​​the control valve and reducing flow resistance.

[0070] In this embodiment, the guide mechanism 4 can be set at the end of the valve core 3 near the medium inlet 102, or at the end of the valve core 3 away from the medium inlet 102, that is, at the end of the valve core 3 near the valve cover 104.

[0071] In this embodiment, the valve core 3 can be a plunger-type valve core. The valve core 3 includes an adjusting valve core 301 and a valve core body 302. The valve core body 302 is connected to the valve core body 02 by fasteners. The adjusting valve core 301 is used to adjust the capacity between the medium inlet 102 and the medium outlet 103. The guide mechanism 4 is disposed on the adjusting valve core 301.

[0072] In this embodiment, the regulating valve core 301 is frustoconical in shape, and the diameter of the end of the regulating valve core 301 near the guide mechanism 4 is smaller than the diameter of the end of the regulating valve core 301 away from the guide mechanism 4. An adjusting structure is machined on the side wall of the regulating valve core 301 to change the distance between the outer peripheral wall of the regulating valve core 301 and the valve body 1 during movement, thereby connecting the medium inlet 102 and the medium outlet 103 and / or changing the flow rate into the medium outlet 103.

[0073] In this embodiment, the regulating structure can be a flow regulating surface 3011. Specifically, the flow regulating surface 3011 can be a stepped surface, a conical surface, a corrugated surface, etc. In the initial state, the top of the regulating valve core 301 abuts against the valve body 1, ensuring that the medium inlet 102 and the medium outlet 103 cannot be connected. When the valve stem 2 moves the regulating valve core 301 upward, due to the action of the flow regulating surface 3011, a gap appears between the regulating valve core 301 and the valve body 1 to allow the medium to pass through, thus achieving connection between the medium inlet 102 and the medium outlet 103. According to the upward movement distance of the regulating valve core 301, the gap between the regulating valve core 301 and the valve body 1 changes, thereby achieving the purpose of controlling the capacity between the medium inlet 102 and the medium outlet 103.

[0074] Furthermore, the guiding mechanism 4 includes a guide member 401 and a mating member 402, which are disposed on the valve core 3 and the valve body 1. The sliding end of the guide member 401 protrudes from the outer peripheral wall of the regulating valve core 301. The guide member 401 and the mating member 402 cooperate with each other to slide along the axial direction of the valve body 1. When the regulating valve core 301 slides, the guide member 401 also moves along with it. The cooperation between the guide member 401 and the mating member 402 plays a guiding role, limiting the offset of the regulating valve core 301 and improving the stability and motion accuracy of the regulating valve core 301 during movement.

[0075] In this embodiment, the guide 401 can be disposed on the valve core 3, and the mating part 402 can be disposed on the valve body 1; alternatively, the guide 401 can be disposed on the valve body 1, and the mating part 402 can be disposed on the valve core 3. The guide 401 and the mating part 402 can be a slider and a slide rail, a slider and a slide groove, or a roller and a slide rail.

[0076] In this embodiment, guidance can also be provided solely by guide member 401. Guide member 401 is an L-shaped guide member. The vertical section of the L-shaped guide member is connected to the bottom of the regulating valve core 301, and the end of the horizontal section of the L-shaped guide member abuts against the inner wall of the valve body 1 and is slidably connected to the valve body 1. In this embodiment, multiple L-shaped guide members are provided. Since the end of each L-shaped guide member abuts against the inner wall of the valve body 1, it ensures that the regulating valve core 301 will not deviate or tilt when it moves, thus guaranteeing motion accuracy.

[0077] In this embodiment, the tapered tube structure of the inlet section 107 can also limit the movement of the guide member 401. As the diameter of the inlet section 107 gradually decreases, when the guide member 401 moves to the top of the inlet section 107, it cannot continue to move downwards due to the smaller diameter, thus limiting its movement.

[0078] In this embodiment, an L-shaped guide structure is used. Since the L-shaped guide is small in size, its blocking effect on the inlet section 107 of the valve body 1 can be reduced.

[0079] In this embodiment, cavity 101 includes a receiving cavity 1011 and a pressure balancing cavity 1012, which are connected. When the regulating valve core 301 is in a fully closed state, the valve core 3 is located in the receiving cavity 1011. When the valve core 3 moves, the upper part of the valve core 3 enters the pressure balancing cavity 1012 and continues to slide within it. The end of the valve stem 2 away from the valve core 3 passes through the pressure balancing cavity 1012 and exits through the other end of the valve body 1. The pressure balancing cavity 1012 is used to balance the pressure at both ends of the valve core 3.

[0080] By utilizing the pressure balancing chamber 1012, the force exerted by the medium at the medium inlet 102 on the valve stem 2 is effectively balanced, thereby reducing the sealing force required for the control valve to seal and reducing the output force requirement of the control valve on the pneumatic actuator. At the same time, it can help reduce the unbalanced force on the valve stem 2 and reduce the risk of valve stem 2 pressure rod instability and reduced motion accuracy.

[0081] In this embodiment, the pressure balancing chamber 1012 is connected to the medium inlet 102 through the connecting structure 6. Specifically, the connecting structure 6 can be a pipe or flow channel inside the valve body 1, a pipe or flow channel provided on the outer wall of the valve body 1, or a pipe provided outside the valve body 1.

[0082] In this embodiment, the connecting structure 6 is disposed inside the valve body 1 and extends through both ends of the valve core 3.

[0083] In this embodiment, the connecting structure 6 includes a pressure-guiding channel 61, which connects the pressure balance chamber 1012 and the medium inlet 102. One end of the pressure-guiding channel 61 extends from the end of the regulating valve core 301, and the other end extends from the end of the valve core body 302 away from the regulating valve core 301. When the medium enters the medium inlet 102, the medium simultaneously enters the pressure balance chamber 1012 through the guiding channel, making the pressure at both ends of the valve core 3 equal and reducing the risk of valve stem instability and decreased movement accuracy. In this embodiment, the pressure-guiding channel 61 can be a pipe or flow channel.

[0084] In this embodiment, the valve core body 302 includes a connector 3021, a support core 3022, and a pressure ring 3023. The regulating valve core 301 is connected to the connector 3021 by fasteners. The support core 3022 is disposed between the pressure ring 3023 and the connector 3021. Under the action of the pressure ring 3023 and the regulating valve core 301, a compact and complete valve core 3 is formed.

[0085] In this embodiment, a non-metallic seal 10 is provided between the regulating valve core 3013 and the connector 3021. The bottom of the non-metallic seal 10 and the boss structure of the valve body 1 are sealed by a planar seal, and the connection between the non-metallic seal 10 and the valve body 1 is sealed by a conical seal. By using different sealing methods, the overall sealing performance is improved.

[0086] In this embodiment, the pressure channel 61 is a pressure tube, which passes through the support core 3022, so that the support core 3022 covers the pressure tube. The support core 3022 provides support when the pressure channel 61 moves, preventing the pressure rod from becoming unstable.

[0087] In this embodiment, the support core 3022 is a thermally insulated support core, which is exemplified by a thermally insulated cylinder: the thermally insulated cylinder is composed of a non-metallic material with a low thermal conductivity. The thermally insulated cylinder has good thermal insulation properties, ensuring that the temperature does not change significantly when the medium flows within the pressure channel 61.

[0088] In this embodiment, multiple support cores 3022 are provided, arranged sequentially along the axial direction of the valve body 1, with heat-insulating chambers 11 between adjacent support cores 3022. Adjacent heat-insulating cylinders are connected by threads, and the heat-insulating chambers 11 between them reduce the heat conduction area of ​​the intermediate connection. This structure helps to reduce the transfer of cold energy from the inlet of the valve body 1 to the upper part.

[0089] In this embodiment, the valve stem 2 is connected to the valve core 3 via a split-joint structure, that is, the valve stem 2 is connected to the end of the valve core 3 body away from the regulating valve core 301 via the split-joint structure. Using the split-joint structure, the coaxiality of the valve stem 2 and the connecting piece 3021 can differ significantly, avoiding situations where the valve stem 2 or the connecting piece 3021 rubs against or gets stuck with the valve body 1.

[0090] In this embodiment, the connecting structure 6 further includes a connecting channel 62, one end of which is connected to the pressure balance chamber 1012, and the other end of which is connected to the pressure tapping channel 61. The connecting channel 62 is positioned to avoid the flow regulating surface 3011. Through the pressure tapping channel 61 and the connecting channel 62, the medium can sequentially pass through the valve core 3 and the split-joint structure to enter the pressure balance chamber 1012.

[0091] Specifically, a split connector 12 is provided at the end where the valve stem 2 is connected to the valve core 3. The split connector 12 is I-shaped and has an annular positioning groove formed on its peripheral wall. The valve core 3 also includes a mounting seat 13, which is located between the support core 3022 and the pressure ring 3023. The mounting seat 13 is fastened to the top of the support core 3022. The mounting seat 13 and the split connector 12 are engaged to realize the split connection between the valve stem 2 and the valve core 3.

[0092] In this embodiment, the mounting base 13 includes a first mounting portion 1301 and a second mounting portion 1302. The first mounting portion 1301 is generally U-shaped, and the groove formed in the first mounting portion 1301 is used to fix the support core 3022. The two sides of the first mounting portion 1301 form chambers with the valve body 1 for installing the O-ring 8 and the coaxial seal 15. The second mounting portion 1302 is integrally formed with the first mounting portion 1301 and is located on the side of the first mounting portion 1301 opposite to the support core 3022. The top of the second mounting portion 1302 has a sliding groove for the insertion of the split connector 12. The second mounting portion 1302 also has a protrusion that inserts into the positioning groove of the valve stem 2 to snap and fix the split connector 12.

[0093] During assembly, the split connector 12 on the valve stem 2 is inserted into the groove of the mounting base 13, then the pressure ring 3023 is placed on top and secured with fasteners. To facilitate the installation of the pressure ring 3023, a notch corresponding to the groove is provided on the pressure ring 3023. After the pressure ring 3023 is installed, the groove is covered by the cover 14 and secured with fasteners.

[0094] In this embodiment, the connecting channel 62 includes a vertical flow channel and a horizontal flow channel. Vertical flow channels are formed inside both the mounting base 13 and the split connector 12. The horizontal flow channels are connected to the pressure balance chamber 1012 and the vertical flow channels of the split connector 12, respectively. After the mounting base 13 and the split connector 12 are installed, the pressure channel 61, the vertical flow channels of the mounting base 13, the vertical flow channels of the split connector 12, and the horizontal flow channels of the split connector 12 are connected.

[0095] In this embodiment, the upper seal of the pressure balance chamber 1012 is achieved through the bellows 7, while the lower seal is based on the O-ring 8 and the coaxial seal 15. The O-ring 8 is used for static sealing, and the coaxial seal 15 is used for dynamic sealing. Compared to the O-ring 8, the coaxial seal 15 has a lower coefficient of friction and a longer lifespan, which can effectively reduce the moving friction of the valve stem 2 and improve the control dead zone of the regulating valve.

[0096] Furthermore, an anti-rotation mechanism 9 is provided, which is located on the valve body 1. The valve stem 2 passes through the anti-rotation mechanism 9 and is slidably connected to the anti-rotation mechanism 9.

[0097] Specifically, the anti-rotation mechanism 9 can be installed on the valve cover 104 or on the extended neck 105 of the valve body. In this embodiment, the valve cover 104 is used as an example for explanation.

[0098] The anti-rotation mechanism 9 includes a fixing member 901 and an anti-rotation member 902. The fixing member 901 is connected to the valve cover 104, and the anti-rotation member 902 is disposed on the valve cover 104. The valve stem 2 passes through the fixing block, and a limit groove 201 is formed on the valve stem 2. The anti-rotation member 902 is inserted into the limit groove 201. When the valve stem 2 moves, the cooperation between the limit groove 201 and the anti-rotation member 902 ensures that the valve stem 2 can only move in a straight line. This prevents the valve stem 2 from rotating during movement and avoids damage to the bellows 7 due to the rotation of the valve stem 2.

[0099] The working principle of the large-capacity cryogenic regulating valve of the present invention is as follows: In the initial setting, the regulating valve is in a completely closed state and installed vertically. The regulating valve is controlled by a pneumatic actuator. When medium enters the medium inlet 102, the pneumatic actuator drives the valve stem 2 to move upward. Through the transmission of the pressure ring 3023 and the support core 3022, the regulating valve core 301 moves upward. Under the action of the flow regulating surface 3011, the medium inlet 102 and the medium outlet 103 are connected. The flow rate between the medium inlet 102 and the medium outlet 103 is adjusted according to the different moving distances of the regulating valve core 301. When the regulating valve core 301 moves, the guide member 401 plays a guiding role, which improves the stability and movement accuracy of the regulating valve core 301.

[0100] When the medium enters the medium inlet 102, the medium simultaneously enters the pressure balance chamber 1012 through the drainage channel, making the pressure at both ends of the valve core 3 equal. This effectively balances the force exerted by the medium at the medium inlet 102 on the valve stem 2 assembly, effectively reducing the sealing force required for the control valve to seal, reducing the output force requirement of the control valve on the pneumatic actuator, and also helping to reduce the unbalanced force of the valve stem 2 assembly, thus reducing the risk of valve stem 2 pressure rod instability and reduced motion accuracy.

[0101] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A large-capacity cryogenic regulating valve, characterized in that: include The valve body (1) has an internal cavity (101) and a medium inlet (102) and a medium outlet (103) at one end. The axis of the medium outlet (103) intersects the axis of the medium inlet (102). The valve core assembly includes a valve core (3) slidably disposed in the cavity (101) for adjusting the flow rate between the medium inlet (102) and the medium outlet (103); A guide mechanism (4) is provided between the valve core (3) and the valve body (1) to guide the valve core (3) to move along the axial direction of the valve body (1).

2. The large-capacity cryogenic regulating valve according to claim 1, characterized in that: The guide mechanism (4) is disposed at one end of the valve core (3) near the medium inlet (102); Alternatively, the guide mechanism (4) may be located at one end of the valve core (3) away from the medium inlet (102).

3. The large-capacity cryogenic regulating valve according to claim 2, characterized in that: The guiding mechanism (4) includes a guide (401) and a mating part (402), which are respectively disposed on the valve core (3) and the valve body (1). The guide (401) and the mating part (402) cooperate with each other to slide along the axial direction of the valve body (1). Preferably, the guide mechanism (4) is located between the end of the valve core (3) near the medium outlet (103) and the medium inlet (102) and the inner peripheral wall of the valve body (1).

4. The large-capacity cryogenic regulating valve according to any one of claims 2 to 3, characterized in that: The valve core (3) includes A regulating valve core (301) is located at one end of the valve core (3) and is used to regulate the flow rate between the medium inlet (102) and the medium outlet (103) when moving; The sliding end of the guide member (401) protrudes from the outer peripheral wall of the regulating valve core (301); Preferably, one end of the guide member (401) is connected to the end face of the regulating valve core (301), and the other end extends toward the inner peripheral wall of the valve body (1) and is slidably connected to the inner peripheral wall of the valve body (1).

5. The large-capacity cryogenic regulating valve according to claim 4, characterized in that: The cavity (101) includes The pressure balancing chamber (1012) is located between the end of the valve core (3) away from the medium inlet (102) and the valve body (1); The pressure balancing chamber (1012) is connected to the medium inlet (102) through the connecting structure (6) to balance the pressure at both ends of the valve core (3); Preferably, the valve core assembly further includes The valve stem (2) is connected at one end to the valve core (3) and at the other end passes through the pressure balance chamber (1012) and exits through the other end of the valve body (1) to drive the valve core (3) to move.

6. The large-capacity cryogenic regulating valve according to claim 5, characterized in that: The connecting structure (6) is disposed inside the valve body (1) and extends through both ends of the valve core (3).

7. The large-capacity cryogenic regulating valve according to any one of claims 5 to 6, characterized in that: It also includes a split-joint structure, which is set on the other end of the valve core (3) and is detachably connected to the valve stem (2); The connectivity structure includes Pressure channel (61) extends through both axial ends of the valve core (3); The connecting channel (62) is disposed through the split joint structure, with one end connected to the pressure balance chamber (1012) and the other end connected to the pressure channel (61).

8. The large-capacity cryogenic regulating valve according to claim 7, characterized in that: The pressure channel (61) is a pressure tube; The valve core (3) also includes A support core (3022) is connected in sequence with the regulating valve core (301) along the axial direction of the valve body (1); The support core (3022) is located between the pressure-sensing tube and the inner peripheral wall of the valve body (1) and is used to provide support when the pressure-sensing tube moves. Preferably, the support core (3022) is a heat-insulating support core; Preferably, there are multiple support cores (3022), and the multiple support cores (3022) are arranged sequentially along the axial direction of the valve body (1), and there is a heat insulation chamber (11) between adjacent support cores (3022).

9. The large-capacity cryogenic regulating valve according to any one of claims 5-8, characterized in that: The cavity (101) also includes The valve body cavity (106) is connected to the medium inlet (102) and the pressure balance cavity (1012), respectively; The centerline of the valve body cavity (106) and the centerline of the medium inlet (102) are eccentrically set, and the centerline of the valve body cavity (106) is biased towards the medium outlet (103).

10. The large-capacity cryogenic regulating valve according to any one of claims 1-9, characterized in that: It also includes an anti-rotation mechanism (9), which is disposed on the valve body (1), and the valve core assembly is disposed on the anti-rotation mechanism (9) and is slidably connected to the anti-rotation mechanism (9); The anti-rotation mechanism (9) is used to limit the circumferential rotation of the valve core assembly.

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