Corrugated pipe low-temperature regulating valve

Abstract

The invention relates to the technical field of valves, in particular to a corrugated pipe low-temperature regulating valve which is characterized in that a valve seat is provided with a medium inlet, a medium outlet and a valve cavity which are communicated; the valve element is movably arranged in the valve cavity in the first direction. The first end of the valve rod extends into the valve cavity and is connected with the valve element, and the second end movably penetrates through the valve seat in the first direction and extends out of the valve cavity. The corrugated pipe is located in the valve cavity and connected between the first end of the valve rod and the valve seat. The self-balancing differential pressure structure comprises a movable cavity and a piston assembly, the piston assembly is arranged in the movable cavity in a sliding mode and divides the movable cavity into two independent parts, the first part is communicated with the inner side of the corrugated pipe, and the second part is communicated with the valve cavity. By arranging the self-balancing pressure difference structure, when the pressure borne by the inner side and the outer side of the corrugated pipe has a pressure difference, the pressure borne by the inner side and the outer side of the corrugated pipe can be balanced, the probability that the corrugated pipe structure is damaged due to the pressure difference is reduced, and therefore the service life of the corrugated pipe can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to a bellows low-temperature regulating valve. Background Art

[0002] In a valve using a bellows as a sealing element, one end of the valve stem is located within the valve cavity of the valve body and connected to the valve core. The bellows are placed within the valve cavity and sleeved over the end of the valve stem connected to the valve core. The bellows, together with the valve stem and valve core, undergo axial displacement to open and close the valve. During the valve opening and closing process, the pressure inside and outside the bellows is constantly changing, and there is a large pressure differential. Operating under such a high pressure differential load for a long time, the bellows is highly susceptible to fatigue damage, plastic deformation, or even rupture failure, which directly leads to valve seal failure, medium leakage, and a serious shortening of the valve's service life. To address the above problems, the present invention proposes a bellows low-temperature regulating valve. Summary of the Invention

[0003] The object of the present invention is to provide a bellows low-temperature regulating valve for solving the problems raised in the above-mentioned background technology.

[0004] The present invention is achieved through the following technical solutions: A bellows low-temperature regulating valve, comprising a valve seat, a valve core, a valve stem, a bellows and a self-balancing pressure differential structure, wherein the valve seat has a connected medium inlet, a medium outlet and a valve cavity; the valve core is movably arranged in the valve cavity along a first direction to allow or cut off the communication between the medium inlet and the medium outlet; the first end of the valve stem extends into the valve cavity and is connected to the valve core, and the second end moves along the first direction through the valve seat and extends to the outside of the valve cavity; the bellows is located in the valve cavity and connected between the first end of the valve stem and the valve seat to seal the movable connection position of the valve stem and the valve seat; the self-balancing pressure differential structure comprises an active chamber and a piston assembly, the piston assembly is slidably arranged in the active chamber and divides the active chamber into two independent parts, wherein the first part is communicated with the inner side of the bellows, and the second part is communicated with the valve cavity.

[0005] Optionally, the valve seat includes an upper valve seat and a lower valve seat arranged along the first direction, the valve cavity is provided on the lower valve seat, the valve cavity forms an assembly port on the surface of the lower valve seat for the valve core and the bellows to pass through, and the upper valve seat can be detachably installed at the assembly port.

[0006] Optionally, a sealing ring plate is fixedly provided on one end of the bellows connected to the valve seat, and the sealing ring plate is clamped and fixed between the upper valve seat and the lower valve seat.

[0007] Optionally, the active chamber is arranged on the lower valve seat, and a first through hole is provided on the sealing ring plate, and the first through hole connects the first part of the active chamber with the inner side of the bellows, and a second through hole is provided on the lower valve seat, and the second through hole connects the second part of the active chamber with the valve cavity.

[0008] Optionally, the movable chamber is formed with a mounting opening on the surface of the lower valve seat for the piston assembly to pass through.

[0009] Optionally, the size of the first through hole and the second through hole are both smaller than the size of the piston assembly.

[0010] Optionally, the first through hole has openings formed on the inner side and bottom surface of the sealing ring plate respectively, the opening of the first through hole located on the inner side of the sealing ring plate is connected to the inner side of the bellows, and the opening of the first through hole located at the bottom of the sealing ring plate is connected to the first part of the active chamber.

[0011] Optionally, the direction in which the piston assembly slides in the active chamber is the first direction.

[0012] Optionally, the piston assembly includes a piston head and a piston sealing ring sleeved on the outside of the piston head, and the piston head is in sliding and sealing contact with the inner wall of the movable chamber through the piston sealing ring.

[0013] Optionally, a clamping portion is fixedly provided at the first end of the valve stem, a connecting column is fixedly provided on the clamping portion, the bellows and the valve core are both provided with connecting holes for the connecting column to move through, and a clamping nut is threadedly connected on the connecting column for clamping the bellows and the valve core to the clamping portion.

[0014] Compared with the prior art, the present invention provides a bellows low-temperature regulating valve with the following beneficial effects: The present invention provides a self-balancing pressure differential structure. When a pressure difference occurs between the inside and outside of the bellows, the piston assembly of the self-balancing pressure differential structure moves freely within the movable chamber, thereby balancing the pressure inside and outside the bellows, reducing the probability of damage to the bellows structure due to the pressure difference, thereby extending the service life of the bellows. The present invention adopts the method of arranging the movable chamber, the first through hole and the second through hole by slotting and punching on the lower valve seat and the sealing ring plate. Compared with the method of laying pipelines, the processing difficulty is lower and the structure is more compact. The movable chamber of the present invention is formed with an installation opening on the surface of the lower valve seat for the piston assembly to pass through. When the piston assembly is damaged, the upper valve seat can be removed from the lower valve seat first, and then the piston assembly can be taken out from the installation opening of the movable chamber, which makes disassembly and installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure at point A; Figure 3 It is a structural schematic diagram of the piston assembly and the active chamber of the present invention.

[0016] In the figure: 100, valve seat; 110, upper valve seat; 111, tapered hole; 112, packing cavity; 113, sealing packing; 114, compression ring; 120, lower valve seat; 121, medium inlet; 122, medium outlet; 123, valve cavity; 124, second through hole; 200, valve core; 300, valve stem; 310, compression portion; 320, connecting column; 330, compression nut; 340, frustum; 400, bellows; 410, sealing ring plate; 411, first through hole; 500, self-balancing pressure difference structure; 510, piston assembly; 511, piston head; 512, piston sealing ring; 520, movable chamber; 521, first part; 522, second part; 600, first sealing ring; 700, second sealing ring; 800, manual actuator; 810, positioning frame; 820, positioning plate; 830, positioning pin; 840, driving handwheel. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example: See Figures 1 to 3According to an embodiment of the present invention, a bellows low-temperature regulating valve is provided, which includes a valve seat 100, a valve core 200, a valve stem 300, a bellows 400 and a self-balancing pressure differential structure 500, wherein the valve seat 100 has a medium inlet 121, a medium outlet 122 and a valve cavity 123 that are connected; the valve core 200 is movably arranged in the valve cavity 123 along a first direction to allow or cut off the communication between the medium inlet 121 and the medium outlet 122. It can be understood that the first direction is the direction close to or away from the communication position between the medium inlet 121 and the medium outlet 122. By moving the valve core 200 along the first direction, the opening and closing of the valve can be controlled; the first end of the valve stem 300 extends into the valve cavity 123 and is in contact with the valve core 200 is connected, the second end of the valve stem 300 moves along the first direction through the valve seat 100 and extends to the outside of the valve cavity 123; the bellows 400 is located in the valve cavity 123 and is connected between the first end of the valve stem 300 and the valve seat 100 to seal the movable connection position of the valve stem 300 and the valve seat 100, so as to prevent the medium in the valve cavity 123 from overflowing from the movable connection position of the valve stem 300 and the valve seat 100; the self-balancing pressure difference structure 500 includes a movable chamber 520 and a piston assembly 510, the piston assembly 510 is slidably arranged in the movable chamber 520 and divides the movable chamber 520 into two independent parts, wherein the first part 521 is communicated with the inner side of the bellows 400, and the second part 522 is communicated with the valve cavity 123.

[0019] The bellows low-temperature regulating valve adopts the above-mentioned structure. Since the bellows 400 is located in the valve cavity 123, the pressure on the outer wall of the bellows 400 mainly comes from the medium in the valve cavity 123. Since the valve cavity 123 is connected to the inner side of the bellows 400 through the active chamber 520, and a piston assembly 510 is provided in the active chamber 520 to prevent the medium in the valve cavity 123 from flowing into the inner side of the bellows 400, when a pressure difference occurs between the inner and outer sides of the bellows 400, the piston assembly 510 will move freely in the active chamber 520 to balance the pressure between the inner and outer sides of the bellows 400, thereby reducing the probability of damage to the structure of the bellows 400 due to the pressure difference, thereby extending the service life of the bellows 400.

[0020] In some embodiments, the valve seat 100 includes an upper valve seat 110 and a lower valve seat 120 arranged along a first direction. A valve cavity 123 is provided on the lower valve seat 120. The valve cavity 123 has an assembly opening formed on the surface of the lower valve seat 120 for the valve core 200 and the bellows 400 to pass through. The upper valve seat 110 is removably mounted to the assembly opening using bolts and nuts. This arrangement allows for the removal of structural components such as the valve core 200 and the bellows 400 within the valve cavity 123 if they become damaged, allowing for replacement of the damaged components.

[0021] In some embodiments, a sealing ring plate 410 is fixedly mounted on one end of the bellows 400 connected to the valve seat 100 by welding or other fixing methods. The sealing ring plate 410 is clamped and fixed between the upper valve seat 110 and the lower valve seat 120. This arrangement not only ensures a sealed connection between the bellows 400 and the valve seat 100, but also facilitates removal of the bellows 400 from the valve seat 100 in the event of damage. To improve the sealing performance of the contact surface between the sealing ring plate 410 and the lower valve seat 120, in this embodiment, a first sealing ring 600 is provided on the contact surface between the sealing ring plate 410 and the lower valve seat 120. In other embodiments, the bellows 400 can also be directly fixed to the upper valve seat 110 by welding, omitting the sealing ring plate 410.

[0022] In some embodiments, the active chamber 520 is provided on the lower valve seat 120, and the sealing ring plate 410 is provided with a first through hole 411, which connects a first portion 521 of the active chamber 520 with the inside of the bellows 400. The lower valve seat 120 is provided with a second through hole 124, which connects a second portion 522 of the active chamber 520 with the valve cavity 123. Specifically, in this embodiment, the first through hole 411 has openings formed on the inner side and bottom surface of the sealing ring plate 410, respectively. The opening of the first through hole 411 located on the inner side of the sealing ring plate 410 connects with the inside of the bellows 400, and the opening of the first through hole 411 located on the bottom of the sealing ring plate 410 connects with the first portion 521 of the active chamber 520. The active chamber 520, first through-hole 411, and second through-hole 124 are formed by slotting and punching the lower valve seat 120 and the sealing ring plate 410. This method reduces manufacturing complexity and provides a more compact structure compared to piping. Furthermore, when the first sealing ring 600 is provided on the contact surface between the sealing ring plate and the lower valve seat 120, a communication port is provided on the first sealing ring 600 at the position corresponding to the active chamber 520, through which the first through-hole 411 communicates with the active chamber 520.

[0023] In some embodiments, the movable chamber 520 has an installation opening formed on the surface of the lower valve seat 120 through which the piston assembly 510 can pass. This arrangement allows for convenient installation and removal of the piston assembly 510 if the piston assembly 510 becomes damaged by first removing the upper valve seat 110 from the lower valve seat 120 and then removing the piston assembly 510 from the installation opening of the movable chamber 520.

[0024] In some embodiments, the size of the first through hole 411 and the second through hole 124 are both smaller than the size of the piston assembly 510. This can limit the range of movement of the piston assembly 510 and prevent the piston assembly 510 from moving out of the active chamber 520 at will.

[0025] In some embodiments, the piston assembly 510 slides in the movable chamber 520 in a first direction. With this arrangement, when the medium pressure in the valve chamber 123 is low (e.g., when the valve is closed), the piston assembly 510 automatically settles to the bottom of the movable chamber 520 under the action of gravity. When the medium pressure in the valve chamber 123 increases, the movable chamber 520 has sufficient space for the piston assembly 510 to move.

[0026] In some embodiments, the piston assembly 510 includes a piston head 511 and a piston seal 512 disposed on the outside of the piston head 511. The piston head 511 is in sliding and sealing contact with the inner wall of the active chamber 520 through the piston seal 512. This ensures that the piston assembly 510 can move within the active chamber 520 and also ensures the sealing between the piston assembly 510 and the inner wall of the active chamber 520.

[0027] In some embodiments, a compression portion 310 is fixedly provided at the first end of the valve stem 300, and a connecting column 320 is fixedly provided on the compression portion 310. The bellows 400 and the valve core 200 are both provided with a connection hole through which the connecting column 320 can move. The connecting column 320 is threadedly connected with a compression nut 330 that clamps the bellows 400 and the valve core 200 to the compression portion 310. Specifically, in this embodiment, the compression portion 310, the connecting column 320 and the valve stem 300 form an integrated structure. By connecting the bellows 400, the valve core 200 and the valve stem 300 in a detachable manner, they can be easily replaced independently later. In addition, in order to improve the sealing between the bellows 400 and the valve core 200, a second sealing ring 700 is provided on the contact surface between the bellows 400 and the valve core 200.

[0028] In some embodiments, the bellows 400 is a first sealing structure between the valve stem 300 and the upper valve seat 110. A second sealing structure and a third sealing structure are also provided between the valve stem 300 and the upper valve seat 110. The second sealing structure includes a frustum 340 provided on the valve stem 300 and a conical hole 111 provided on the upper valve seat 110. When the valve core 200 is in a fully open position, the frustum 340 on the valve stem 300 is pressed against the conical hole 111 of the valve seat 100, thereby achieving secondary sealing. The third sealing structure includes a stuffing cavity 112 provided on the upper valve seat 110. The stuffing cavity 112 is filled with a sealing stuffing 113 surrounding the valve stem 300. The stuffing cavity 112 is formed with a replacement port on the surface of the upper valve seat 110. The replacement port is used to replace the sealing stuffing 113 in the stuffing cavity 112. A tightening ring sleeve 114 is threadedly connected to the replacement port. By rotating the tightening ring sleeve 114, the tightness of the sealing stuffing 113 can be adjusted to ensure a reliable seal.

[0029] In some embodiments, the bellows 400 low-temperature regulating valve also includes an actuator for driving the valve stem 300 to move along the first direction. The actuator can be a pneumatic actuator, an electric actuator or a hydraulic actuator. Specifically in this embodiment, the actuator is a manual actuator 800. The manual actuator 800 includes a positioning frame 810 fixed on the upper valve seat 110 and a positioning plate 820 slidably connected to the positioning frame 810 along the first direction. The second end of the valve stem 300 passes through the positioning frame 810, and the positioning plate 820 is fixed to the valve stem 300 by a positioning pin 830. The positioning plate 820 can limit the rotation of the valve stem 300 and provide guide support for the movement of the valve stem 300 along the first direction. The outside of the second end of the valve stem 300 has an external thread, and the positioning frame 810 is rotatably connected to a driving handwheel 840 that cooperates with the external thread of the second end of the valve stem 300. By rotating the driving handwheel 840 forward and backward, the valve stem 300 can be driven to move in the first direction.

[0030] When the solution of this embodiment is applied, since the bellows 400 is located in the valve cavity 123, the pressure on the outer wall of the bellows 400 mainly comes from the medium in the valve cavity 123. Since the valve cavity 123 is connected to the inner side of the bellows 400 through the movable chamber 520, and a piston assembly 510 is provided in the movable chamber 520 to prevent the medium in the valve cavity 123 from flowing into the inner side of the bellows 400, when a pressure difference occurs between the inner and outer sides of the bellows 400, the piston assembly 510 will move freely in the movable chamber 520 to balance the pressure between the inner and outer sides of the bellows 400, thereby reducing the probability of damage to the structure of the bellows 400 due to the pressure difference, thereby extending the service life of the bellows 400.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bellows low-temperature regulating valve, characterized in that: include: A valve seat (100) having a medium inlet (121), a medium outlet (122), and a valve cavity (123) that are connected to each other; a valve core (200) movably disposed in the valve cavity (123) along a first direction to allow or cut off communication between the medium inlet (121) and the medium outlet (122); a valve stem (300), a first end of which extends into the valve cavity (123) and is connected to the valve core (200), and a second end of which moves along the first direction, passes through the valve seat (100) and extends to the outside of the valve cavity (123); a bellows (400) located in the valve cavity (123) and connected between the first end of the valve stem (300) and the valve seat (100) to seal the movable connection position between the valve stem (300) and the valve seat (100); and A self-balancing pressure differential structure (500) comprises an active chamber (520) and a piston assembly (510), wherein the piston assembly (510) is slidably disposed in the active chamber (520) and divides the active chamber (520) into two independent parts, wherein the first part (521) is communicated with the inner side of the bellows (400), and the second part (522) is communicated with the valve chamber (123).

2. The bellows low-temperature regulating valve according to claim 1, characterized in that: The valve seat (100) comprises an upper valve seat (110) and a lower valve seat (120) arranged along the first direction, the valve cavity (123) being provided on the lower valve seat (120), the valve cavity (123) being formed with an assembly opening on the surface of the lower valve seat (120) for allowing the valve core (200) and the bellows (400) to pass through, and the upper valve seat (110) being detachably mounted at the assembly opening.

3. The bellows low-temperature regulating valve according to claim 2, characterized in that: A sealing ring plate (410) is fixedly provided at one end of the bellows (400) connected to the valve seat (100), and the sealing ring plate (410) is clamped and fixed between the upper valve seat (110) and the lower valve seat (120).

4. The bellows low-temperature regulating valve according to claim 3, characterized in that: The active chamber (520) is provided on the lower valve seat (120), and a first through hole (411) is provided on the sealing ring plate (410), and the first through hole (411) connects the first part (521) of the active chamber (520) with the inner side of the bellows (400), and a second through hole (124) is provided on the lower valve seat (120), and the second through hole (124) connects the second part (522) of the active chamber (520) with the valve cavity (123).

5. The bellows low-temperature regulating valve according to claim 4, characterized in that: The movable chamber (520) is formed with a mounting opening on the surface of the lower valve seat (120) through which the piston assembly (510) can pass.

6. The bellows low-temperature regulating valve according to claim 4, characterized in that: The sizes of the first through hole (411) and the second through hole (124) are both smaller than the size of the piston assembly (510).

7. The bellows low-temperature regulating valve according to claim 4, characterized in that: The first through hole (411) is formed with openings on the inner side and bottom surface of the sealing ring plate (410), respectively. The opening of the first through hole (411) located on the inner side of the sealing ring plate (410) is communicated with the inner side of the bellows (400), and the opening of the first through hole (411) located on the bottom of the sealing ring plate (410) is communicated with the first part (521) of the active chamber (520).

8. The bellows low-temperature regulating valve according to any one of claims 1 to 7, characterized in that: The direction in which the piston assembly (510) slides in the active chamber (520) is the first direction.

9. The bellows low-temperature regulating valve according to any one of claims 1 to 7, characterized in that: The piston assembly (510) comprises a piston head (511) and a piston sealing ring (512) sleeved on the outside of the piston head (511), and the piston head (511) is in sliding and sealing contact with the inner wall of the active chamber (520) through the piston sealing ring (512).

10. The bellows low-temperature regulating valve according to claim 2, characterized in that: A clamping portion (310) is fixedly provided at the first end of the valve stem (300), a connecting column (320) is fixedly provided on the clamping portion (310), the bellows (400) and the valve core (200) are both provided with connecting holes through which the connecting column (320) can movably pass, and a clamping nut (330) is threadedly connected to the connecting column (320) for clamping and fixing the bellows (400) and the valve core (200) to the clamping portion (310).

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