CN113983181A

CN113983181A - Stop valve suitable for high-temperature fluid

Info

Publication number: CN113983181A
Application number: CN202111365085.XA
Authority: CN
Inventors: 朱华峰; 陈希; 陈思; 徐进杰; 朱金娟; 夏小涵
Original assignee: Zhejiang Ruitong Valve Co ltd
Current assignee: Zhejiang Ruitong Valve Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-01-28

Abstract

The invention discloses a stop valve suitable for high-temperature fluid, belonging to the field of stop valves, and comprising a valve body, wherein the temperature of the high-temperature fluid is transmitted to a deformation memory metal ring through a heat conducting rod, thereby causing the deformation memory metal ring to deform, the deformed deformation memory metal ring drives the linkage ring to move upwards, the upwards moving linkage ring synchronously drives the second rubber ring to move upwards, the upwards moving second rubber ring continuously compresses the space at the upper end of the annular cavity, the air at the upper end of the annular cavity is extruded by the second rubber ring and then is matched with the annular through groove to circulate to the inner cavity of the annular elastic air bag, therefore, the annular elastic air bag is expanded, the expanded annular elastic air bag tightly wraps the valve rod, the sealing effect between the valve rod and the sealing cylinder is improved, and the possibility of high-temperature fluid in the inner cavity of the valve body and associated gas phase external overflow is reduced.

Description

Stop valve suitable for high-temperature fluid

Technical Field

The invention relates to the field of stop valves, in particular to a stop valve suitable for high-temperature fluid.

Background

The stop valve, also called stop valve, is one of the most widely used valves, it is popular because the friction between the sealing surfaces in the opening and closing process is small, it is relatively durable, the opening height is not large, it is easy to manufacture, it is convenient to maintain, not only suitable for middle and low pressure, but also suitable for high pressure, the closing principle of the stop valve is, rely on the valve lever pressure, make the sealing surface of the valve flap and sealing surface of the valve seat closely laminate, prevent the medium from circulating, the "three changes of the valve" of our country have stipulated, the flow direction of the stop valve, adopt from top to bottom uniformly, so there is directionality while installing, the structural length of the stop valve is greater than the gate valve, the fluid resistance is large at the same time, the long-term operation, the sealing reliability is not strong, the stop valve is one of the most important cut-off type valves, play an important role in the aerospace field. As an important element of the aerospace equipment, the stop valve realizes the functions of medium conveying, stopping, adjusting and the like, and the sealing performance of the stop valve directly influences the safe and reliable operation of the aerospace equipment. The influence factors and the influence rules of the sealing characteristics of the typical stop valve are researched, and the method has guiding significance on the structural design of the valve sealing pair, so that the sealing performance and the reliability of the valve are improved.

In the process of operating the existing stop valve for high-temperature fluid, when the stop valve is opened, the inner cavity of the stop valve is filled with the high-temperature fluid, the space of the inner cavity of the stop valve is always kept in a constant state, the higher the temperature of the inner cavity of the stop valve is, the higher the internal air pressure is, and the high-temperature fluid and the associated gas in the inner cavity of the stop valve easily overflow to the outside due to the influence of the air pressure.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a stop valve suitable for high-temperature fluid, when the stop valve is in an open state, an inner cavity of a valve body is filled with the high-temperature fluid, the temperature of the high-temperature fluid is transmitted to a deformation memory metal ring through a heat conducting rod, so that the deformation memory metal ring is deformed, the deformed deformation memory metal ring drives a linkage ring to move upwards, the upward moving linkage ring synchronously drives a second rubber ring to move upwards, the second rubber ring which moves upwards continuously compresses a space at the upper end of an annular cavity, gas at the upper end of the annular cavity is extruded by the second rubber ring and then is matched with an annular through groove to flow into the inner cavity of an annular elastic air bag, so that the annular elastic air bag expands, the expanded annular elastic air bag tightly wraps a valve rod, and the sealing effect between the valve rod and a sealing barrel is improved, the possibility of high-temperature fluid in the inner cavity of the valve body and associated gas overflowing from the outside is reduced, when the valve is in an open state, the upper end of the connecting ring is in contact with the lower end of the sealing cylinder, the connecting ring synchronously drives the second rubber ring to upwards displace, and simultaneously drives the first rubber ring to upwards displace, at the moment that the upper end of the connecting ring is in contact with the lower end of the sealing cylinder, the adsorption port, the connecting cavity, the communicating pipe and the T-shaped cavity form a complete closed cavity, the inner space of the closed cavity is continuously increased along with the upwards displacement of the first rubber ring, but the inner gas content of the closed cavity is kept constant due to the wrapping of the annular elastic air bag on the valve rod, and finally negative pressure is formed inside the closed cavity, so that the upper end of the connecting ring and the lower end of the sealing cylinder are mutually adsorbed, and the sealing effect between the connecting ring and the sealing cylinder is improved, the high-temperature fluid in the inner cavity of the valve body and the associated gas phase outside overflow possibility are further reduced, the contact surface of the annular elastic air bag is adsorbed through the through hole in the negative pressure forming process in the closed cavity, and the sealing performance between the annular elastic air bag and the valve rod is further improved.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A stop valve suitable for high-temperature fluid comprises a valve body, wherein a valve cover is fixedly connected to the upper end of the valve body, a sealing cylinder is fixedly connected to the inner wall of the valve cover, a threaded ring is fixedly connected to the upper end of the valve cover, a valve rod is in threaded connection with the inner wall of the threaded ring, the lower end of the valve rod penetrates through the sealing cylinder and extends to an inner cavity of the valve body, a valve clack is fixedly connected to the lower end of the valve rod, an annular cavity is formed in the sealing cylinder, a deformation memory metal ring is fixedly connected to the inner bottom end of the annular cavity, a heat conducting rod is fixedly connected to the outer circumferential surface of the deformation memory metal ring and extends to the inner cavity of the valve body, a linkage ring is fixedly connected to the upper end of the deformation memory metal ring, a first rubber ring is fixedly connected to the lower end of the linkage ring, an adsorption port is formed in the lower end of the annular cavity, and the adsorption port is matched with the first rubber ring, the upper end fixedly connected with second rubber ring of link ring, second rubber ring and toroidal cavity phase-match, the inner wall fixedly connected with annular elastic airbag of a sealed section of thick bamboo, the outer periphery at the valve rod is established to annular elastic airbag cover, toroidal cavity's inner wall is dug and is had annular through groove, toroidal cavity is linked together through annular through groove and annular elastic airbag, and when the stop valve was in the open mode, the inner chamber of valve body will be full of high-temperature fluid, and its high-temperature fluid's temperature passes through heat conduction pole conduction to deformation memory metal ring to make deformation memory metal ring take place deformation, and deformation memory metal ring will drive the link ring and upwards remove, and the link ring of rebound will drive the second rubber ring simultaneously and upwards carry out displacement, and the second rubber ring of rebound will compress the space of toroidal cavity upper end constantly, and its toroidal cavity upper end gas cooperates annular through the annular through groove circulation to annular elastic gas again through the extrusion of second rubber ring The inner chamber of the bag, thus make the annular elastic gasbag take place to expand, the expanded annular elastic gasbag will be the valve rod of the tight parcel, improve the sealed effect between valve rod and the sealed section of thick bamboo, reduce the high temperature fluid of the valve body inner chamber and the associated gaseous possibility that the external world spills over mutually.

Furthermore, the upper end of the valve clack is fixedly connected with a connecting ring, a communicating cavity is drilled inside the connecting ring, a communicating pipe is fixedly connected to the inner wall of the connecting ring, one end, far away from the connecting ring, of the communicating pipe is fixedly connected with the lower end of the valve rod, a T-shaped cavity is drilled inside the valve rod, the communicating cavity is communicated with the T-shaped cavity through the communicating pipe, a through hole is drilled on the inner wall of the T-shaped cavity, when the valve is in an open state, the upper end of the connecting ring is in contact with the lower end of the sealing barrel, the connecting ring simultaneously drives the first rubber ring to move upwards while synchronously driving the second rubber ring to move upwards, and at the moment when the upper end of the connecting ring is in contact with the lower end of the sealing barrel, the adsorption port, the communicating cavity, the communicating pipe and the T-shaped cavity form a complete closed cavity, along with the ascending displacement of first rubber ring, the inner space of its closed cavity will constantly increase, but the inside gas content of closed cavity will keep invariable because of the parcel of annular elasticity gasbag to the valve rod, finally cause the inside of closed cavity to form the negative pressure, thereby make the upper end of linking up the ring adsorb each other with the lower extreme of a sealed section of thick bamboo, improve the sealed effect between linking up the ring and a sealed section of thick bamboo, further reduce the high temperature fluid of valve body inner chamber and the external possibility that spills over of associated gas mutually, the inside in-process that forms the negative pressure of closed cavity, adsorb annular elasticity gasbag's contact surface through the through-hole, further improve the leakproofness between annular elasticity gasbag and the valve rod.

Furthermore, the upper end of the connecting ring is fixedly connected with a sealing layer, the sealing layer is made of rubber materials, the sealing effect of the upper end of the connecting ring and the lower end of the sealing barrel is improved through the sealing layer, the upper end of the connecting ring and the lower end of the sealing barrel are convenient to adsorb each other, and the possibility of gas leakage at the connecting part of the connecting ring and the sealing barrel is reduced.

Furthermore, the inner wall of the annular elastic air bag is in contact with the outer circumferential surface of the valve rod, the contact surface of the annular elastic air bag is provided with a wear-resistant layer, when the valve rod rotates, friction is generated between the valve rod and the inner wall of the annular elastic air bag, the wear of the contact surface of the annular elastic air bag is reduced through the wear-resistant layer, and the service life of the annular elastic air bag is prolonged.

Furthermore, the lower end of the adsorption port is matched with the upper end of the communication cavity, so that the communication effect between the adsorption port and the communication cavity is improved.

Further, the upper end of valve body sets the thread tightening subassembly, the valve body passes through to constitute fixed connection between thread tightening subassembly and the valve gap, through the thread tightening subassembly, is convenient for dismantle the valve gap, is convenient for maintain the maintenance to the part of valve gap inner chamber.

Further, the upper end fixed rotation of valve rod is connected with sealed lid, the lower extreme of sealed lid adopts magnetic material to make, the lower extreme of sealed lid adsorbs mutually with the upper end of valve rod, through opening sealed lid, the inside atmospheric pressure of balanced closed cavity, and the rotation of the valve rod of being convenient for is closed the operation, adsorbs mutually through the lower extreme of sealed lid and the upper end of valve rod, improves sealed lid rotation connection's stability.

Furthermore, the upper end of the sealing cover is fixedly connected with a pull ring, the pull ring is made of stainless steel materials, and through the pull ring, a person can conveniently open the sealing cover.

Further, the inner wall fixedly connected with buffer layer of pull ring, the buffer layer adopts silica gel material to make, opens the in-process of sealed lid at personnel, through the buffer layer, reduces the painful sense that personnel pointed.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) when the stop valve is in an open state, the inner cavity of the valve body is filled with high-temperature fluid, the temperature of the high-temperature fluid is transmitted to the deformation memory metal ring through the heat conducting rod, so that the deformation memory metal ring is deformed, the deformed deformation memory metal ring drives the linkage ring to move upwards, the linkage ring which moves upwards synchronously drives the second rubber ring to move upwards, the second rubber ring which moves upwards continuously compresses the space at the upper end of the annular cavity, the air at the upper end of the annular cavity is extruded by the second rubber ring and then is matched with the annular through groove to circulate to the inner cavity of the annular elastic air bag, therefore, the annular elastic air bag is expanded, the expanded annular elastic air bag tightly wraps the valve rod, the sealing effect between the valve rod and the sealing cylinder is improved, and the possibility of high-temperature fluid in the inner cavity of the valve body and associated gas phase external overflow is reduced.

(2) The upper end of the valve clack is fixedly connected with a connecting ring, the interior of the connecting ring is provided with a communicating cavity, the inner wall of the connecting ring is fixedly connected with a communicating pipe, one end of the communicating pipe far away from the connecting ring is fixedly connected with the lower end of the valve rod, the interior of the valve rod is provided with a T-shaped cavity, the communicating cavity is communicated with the T-shaped cavity through the communicating pipe, the inner wall of the T-shaped cavity is provided with a through hole, when the valve is in an open state, the upper end of the connecting ring is contacted with the lower end of the sealing barrel, the connecting ring synchronously drives the second rubber ring to upwards displace, simultaneously, the connecting ring also drives the first rubber ring to upwards displace, at the moment the upper end of the connecting ring is contacted with the lower end of the sealing barrel, the adsorption port, the communicating cavity, the communicating pipe and the T-shaped cavity form a complete closed cavity, and the internal space of the closed cavity is continuously increased along with the upwards displacement of the first rubber ring, however, the content of the gas in the closed cavity is kept constant due to the fact that the annular elastic air bag wraps the valve rod, negative pressure is finally formed in the closed cavity, the upper end of the connecting ring and the lower end of the sealing barrel are made to adsorb each other, the sealing effect between the connecting ring and the sealing barrel is improved, the possibility that high-temperature fluid in the inner cavity of the valve body and associated gas overflow from the outside is further reduced, in the process of forming the negative pressure in the closed cavity, the contact surface of the annular elastic air bag is adsorbed through the through hole, and the sealing performance between the annular elastic air bag and the valve rod is further improved.

(3) The sealing layer is fixedly connected to the upper end of the connecting ring and made of rubber materials, the sealing effect of the upper end of the connecting ring and the lower end of the sealing barrel is improved through the sealing layer, the upper end of the connecting ring and the lower end of the sealing barrel are convenient to adsorb each other, and the possibility of gas leakage at the connecting position of the connecting ring and the sealing barrel is reduced.

(4) The inner wall of the annular elastic air bag is in contact with the outer circumferential surface of the valve rod, the contact surface of the annular elastic air bag is provided with the wear-resistant layer, when the valve rod rotates, friction is generated between the valve rod and the inner wall of the annular elastic air bag, the wear of the contact surface of the annular elastic air bag is reduced through the wear-resistant layer, and the service life of the annular elastic air bag is prolonged.

(5) The lower end of the adsorption port is matched with the upper end of the communication cavity, so that the communication effect between the adsorption port and the communication cavity is improved.

(6) The upper end of valve body has set the thread tightening subassembly, and the valve body passes through to constitute fixed connection between thread tightening subassembly and the valve gap, through the thread tightening subassembly, is convenient for dismantle the valve gap, is convenient for maintain the maintenance to the part of valve gap inner chamber.

(7) The upper end fixed rotation of valve rod is connected with sealed lid, and the lower extreme of sealed lid adopts magnetic material to make, and the lower extreme of sealed lid adsorbs mutually with the upper end of valve rod, through opening sealed lid, balances the inside atmospheric pressure of closed cavity, and the rotation of the valve rod of being convenient for is closed the operation, adsorbs mutually through the lower extreme of sealed lid and the upper end of valve rod, improves sealed lid rotation connection's stability.

(8) The upper end fixedly connected with pull ring of sealed lid, the pull ring adopts stainless steel material to make, through the pull ring, the personnel of being convenient for open sealed lid.

(9) The inner wall fixedly connected with buffer layer of pull ring, the buffer layer adopts silica gel material to make, opens the in-process of sealed lid at personnel, through the buffer layer, reduces the painful sense that personnel pointed.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the shut-off valve of the present invention in a closed configuration;

FIG. 3 is a schematic view of the open state of the shut-off valve of the present invention;

FIG. 4 is a schematic overall sectional view of the present invention;

FIG. 5 is a schematic cross-sectional view of the sealing cartridge of the present invention;

FIG. 6 is a schematic view of a linkage ring structure according to the present invention.

The reference numbers in the figures illustrate:

1 valve body, 101 thread tightening assembly, 2 valve gap, 3 sealed section of thick bamboo, 4 screw rings, 5 valve stems, 501 sealed lid, 502 pull ring, 503 buffer layer, 6 valve clacks, 7 annular cavity, 8 shape change memory metal ring, 9 heat-conducting rod, 10 link ring, 11 first rubber ring, 12 adsorb mouthful, 13 second rubber ring, 14 annular elasticity gasbag, 15 annular logical groove, 16 link up the ring, 1601 sealing layer, 17 intercommunication cavity, 18 communicating pipe, 19T shape cavity, 20 through-holes.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-6, a stop valve for high temperature fluid comprises a valve body 1, a valve cap 2 fixedly connected to the upper end of the valve body 1, a sealing cylinder 3 fixedly connected to the inner wall of the valve cap 2, a threaded ring 4 fixedly connected to the upper end of the valve cap 2, a valve stem 5 threadedly connected to the inner wall of the threaded ring 4, a valve flap 6 fixedly connected to the lower end of the valve stem 5 and extending to the inner cavity of the valve body 1 through the sealing cylinder 3, an annular cavity 7 chiseled inside the sealing cylinder 3, a deformation memory metal ring 8 fixedly connected to the inner bottom end of the annular cavity 7, a heat conducting rod 9 fixedly connected to the outer circumferential surface of the deformation memory metal ring 8, a linkage ring 10 fixedly connected to the upper end of the deformation memory metal ring 8, a first rubber ring 11 fixedly connected to the lower end of the linkage ring 10, and an adsorption port 12 provided at the lower end of the annular cavity 7, the adsorption port 12 is matched with the first rubber ring 11, the upper end of the linkage ring 10 is fixedly connected with a second rubber ring 13, the second rubber ring 13 is matched with the annular cavity 7, the inner wall of the sealing cylinder 3 is fixedly connected with an annular elastic air bag 14, the annular elastic air bag 14 is sleeved on the outer circumferential surface of the valve rod 5, the inner wall of the annular cavity 7 is provided with an annular through groove 15 in a chiseling way, the annular cavity 7 is communicated with the annular elastic air bag 14 through the annular through groove 15, when the stop valve is in an opening state, the inner cavity of the valve body 1 is filled with high-temperature fluid, the temperature of the high-temperature fluid is transmitted to the deformation memory metal ring 8 through the heat conduction rod 9, so that the deformation memory metal ring 8 is deformed, the deformed deformation memory metal ring 8 drives the linkage ring 10 to move upwards, the linkage ring 10 moving upwards synchronously drives the second rubber ring 13 to move upwards, and the second rubber ring 13 moving upwards continuously compresses the space at the upper end of the annular cavity 7, the gas at the upper end of the annular cavity 7 is extruded by the second rubber ring 13 and then matched with the annular through groove 15 to circulate to the inner cavity of the annular elastic air bag 14, so that the annular elastic air bag 14 expands, the expanded annular elastic air bag 14 tightly wraps the valve rod 5, the sealing effect between the valve rod 5 and the sealing barrel 3 is improved, and the possibility of high-temperature fluid in the inner cavity of the valve body 1 and associated gas phase external overflow is reduced.

Referring to fig. 4-5, an engagement ring 16 is fixedly connected to the upper end of the valve flap 6, a communication cavity 17 is drilled inside the engagement ring 16, a communication pipe 18 is fixedly connected to the inner wall of the engagement ring 16, one end of the communication pipe 18, which is far away from the engagement ring 16, is fixedly connected to the lower end of the valve rod 5, a T-shaped cavity 19 is drilled inside the valve rod 5, the communication cavity 17 is communicated with the T-shaped cavity 19 through the communication pipe 18, a through hole 20 is drilled on the inner wall of the T-shaped cavity 19, when the valve is in an open state, the upper end of the engagement ring 16 contacts with the lower end of the sealing barrel 3, the linkage ring 10 synchronously drives the second rubber ring 13 to displace upwards, the linkage ring 10 simultaneously drives the first rubber ring 11 to displace upwards, and at the moment the upper end of the engagement ring 16 contacts with the lower end of the sealing barrel 3, the suction port 12, the communication cavity 17, the communication pipe 18 and the T-shaped cavity 19 form a complete closed cavity, along with the upward displacement of the first rubber ring 11, the inner space of the closed cavity of the first rubber ring is continuously increased, but the content of gas in the closed cavity is kept constant due to the fact that the annular elastic air bag 14 wraps the valve rod 5, and finally negative pressure is formed in the closed cavity, so that the upper end of the connecting ring 16 and the lower end of the sealing barrel 3 are mutually adsorbed, the sealing effect between the connecting ring 16 and the sealing barrel 3 is improved, the possibility that high-temperature fluid in the inner cavity of the valve body 1 and associated gas overflow from the outside is further reduced, in the process of forming negative pressure in the closed cavity, the contact surface of the annular elastic air bag 14 is adsorbed through the through hole 20, and the sealing performance between the annular elastic air bag 14 and the valve rod 5 is further improved.

Referring to fig. 1-3, a thread fastening assembly 101 is disposed at an upper end of a valve body 1, the valve body 1 is fixedly connected to a valve cover 2 through the thread fastening assembly 101, the valve cover 2 is conveniently detached through the thread fastening assembly 101, maintenance and repair of parts in an inner cavity of the valve cover 2 are facilitated, a sealing cover 501 is fixedly and rotatably connected to an upper end of a valve rod 5, a lower end of the sealing cover 501 is made of a magnetic material, a lower end of the sealing cover 501 is attached to an upper end of the valve rod 5, air pressure in a closed cavity is balanced by opening the sealing cover 501, rotation and closing operations of the valve rod 5 are facilitated, stability of rotation and connection of the sealing cover 501 is improved by attaching the lower end of the sealing cover 501 to the upper end of the valve rod 5, a pull ring 502 is fixedly connected to the upper end of the sealing cover 501, the pull ring 502 is made of a stainless steel material, and a person can conveniently open the sealing cover 501 through the pull ring 502, the inner wall of the pull ring 502 is fixedly connected with a buffer layer 503, the buffer layer 503 is made of a silica gel material, and in the process that a person opens the sealing cover 501, the buffer layer 503 reduces the pain of fingers of the person.

Referring to fig. 4-5, a sealing layer 1601 is fixedly connected to an upper end of the connecting ring 16, the sealing layer 1601 is made of a rubber material, the sealing effect of the upper end of the connecting ring 16 and the lower end of the sealing cylinder 3 is improved through the sealing layer 1601, the upper end of the connecting ring 16 and the lower end of the sealing cylinder 3 are convenient to adsorb each other, the possibility of gas leakage at the connecting part of the connecting ring 16 and the sealing cylinder 3 is reduced, the inner wall of the elastic annular air bag 14 is in contact with the outer circumferential surface of the valve rod 5, the contact surface of the elastic annular air bag 14 is provided with a wear-resistant layer, when the valve rod 5 rotates, friction is generated between the valve rod and the inner wall of the annular elastic air bag 14, the abrasion of the contact surface of the annular elastic air bag 14 is reduced through the abrasion-resistant layer, the service life of the annular elastic air bag 14 is prolonged, the lower end of the adsorption port 12 is matched with the upper end of the communication cavity 17, and the communication effect between the adsorption port 12 and the communication cavity 17 is improved.

The working principle is as follows: when the stop valve is in an open state, the inner cavity of the valve body 1 is filled with high-temperature fluid, the temperature of the high-temperature fluid is conducted to the deformation memory metal ring 8 through the heat conducting rod 9, so that the deformation memory metal ring 8 is deformed, the deformed deformation memory metal ring 8 drives the linkage ring 10 to move upwards, the linkage ring 10 moving upwards synchronously drives the second rubber ring 13 to move upwards, the second rubber ring 13 moving upwards continuously compresses the space at the upper end of the annular cavity 7, the gas at the upper end of the annular cavity 7 is extruded by the second rubber ring 13 and then is matched with the annular through groove 15 to circulate to the inner cavity of the annular elastic air bag 14, so that the annular elastic air bag 14 expands, the expanded annular elastic air bag 14 tightly wraps the valve rod 5, the sealing effect between the valve rod 5 and the sealing barrel 3 is improved, and the possibility of external overflow of the high-temperature fluid and associated gas in the inner cavity of the valve body 1 is reduced, when the valve is in an open state, the upper end of the connecting ring 16 is contacted with the lower end of the sealing cylinder 3, the linkage ring 10 synchronously drives the second rubber ring 13 to move upwards, the linkage ring 10 also simultaneously drives the first rubber ring 11 to move upwards, at the moment that the upper end of the connecting ring 16 is contacted with the lower end of the sealing cylinder 3, the adsorption port 12, the communication cavity 17, the communication pipe 18 and the T-shaped cavity 19 form a complete closed cavity, along with the upward movement of the first rubber ring 11, the internal space of the closed cavity is continuously increased, but the internal gas content of the closed cavity is kept constant due to the wrapping of the annular elastic air bag 14 on the valve rod 5, and finally the negative pressure is formed inside the closed cavity, so that the upper end of the connecting ring 16 is mutually adsorbed with the lower end of the sealing cylinder 3, and the sealing effect between the connecting ring 16 and the sealing cylinder 3 is improved, the possibility of high-temperature fluid in the inner cavity of the valve body 1 and associated gas phase outside overflow is further reduced, and in the process of negative pressure formed inside the closed cavity, the contact surface of the annular elastic air bag 14 is adsorbed through the through hole 20, so that the sealing property between the annular elastic air bag 14 and the valve rod 5 is further improved.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. A stop valve suitable for high-temperature fluid comprises a valve body (1) and is characterized in that: the upper end of the valve body (1) is fixedly connected with a valve cover (2), the inner wall of the valve cover (2) is fixedly connected with a sealing barrel (3), the upper end of the valve cover (2) is fixedly connected with a threaded ring (4), the inner wall of the threaded ring (4) is in threaded connection with a valve rod (5), the lower end of the valve rod (5) penetrates through the inner cavity of the sealing barrel (3) and extends to the valve body (1), the lower end of the valve rod (5) is fixedly connected with a valve clack (6), an annular cavity (7) is formed in the sealing barrel (3), the inner bottom end of the annular cavity (7) is fixedly connected with a deformation memory metal ring (8), the outer circumferential surface of the deformation memory metal ring (8) is fixedly connected with a heat conducting rod (9), the heat conducting rod (9) penetrates through the sealing barrel (3) and extends to the inner cavity of the valve body (1), the upper end of the deformation memory metal ring (8) is fixedly connected with a linkage ring (10), the lower extreme fixedly connected with first rubber ring (11) of linkage ring (10), the lower extreme of toroidal cavity (7) is equipped with adsorbs mouthful (12), adsorb between mouthful (12) and first rubber ring (11) phase-match, the upper end fixedly connected with second rubber ring (13) of linkage ring (10), second rubber ring (13) and toroidal cavity (7) phase-match, the inner wall fixedly connected with annular elasticity gasbag (14) of a sealed section of thick bamboo (3), the outer periphery at valve rod (5) is established to annular elasticity gasbag (14) cover, the inner wall of toroidal cavity (7) is opened and is chiseled annular through groove (15), be linked together between toroidal cavity (7) through annular through groove (15) and annular elasticity gasbag (14).

2. A shut-off valve adapted for use with high temperature fluids as claimed in claim 1, wherein: the upper end fixedly connected with of valve clack (6) links up ring (16), the inside of linking up ring (16) is opened and is dug there is intercommunication cavity (17), the inner wall fixedly connected with communicating pipe (18) of linking up ring (16), the one end of linking up ring (16) is kept away from in communicating pipe (18) constitutes fixed connection with the lower extreme of valve rod (5), the inside of valve rod (5) is opened and is dug there is T shape cavity (19), be linked together between intercommunication cavity (17) through communicating pipe (18) and T shape cavity (19), the inner wall of T shape cavity (19) is opened and is dug there is through-hole (20).

3. A shut-off valve adapted for use with high temperature fluids as claimed in claim 2, wherein: the upper end of the connecting ring (16) is fixedly connected with a sealing layer (1601), and the sealing layer (1601) is made of rubber materials.

4. A shut-off valve adapted for use with high temperature fluids as claimed in claim 1, wherein: the inner wall of the annular elastic air bag (14) is in contact with the outer circumferential surface of the valve rod (5), and a wear-resistant layer is arranged on the contact surface of the annular elastic air bag (14).

5. A shut-off valve adapted for use with high temperature fluids as claimed in claim 1, wherein: the lower end of the adsorption port (12) is matched with the upper end of the communicating cavity (17).

6. A shut-off valve adapted for use with high temperature fluids as claimed in claim 1, wherein: the upper end of the valve body (1) is provided with a thread fixing component (101), and the valve body (1) is fixedly connected with the valve cover (2) through the thread fixing component (101).

7. A shut-off valve adapted for use with high temperature fluids as claimed in claim 1, wherein: the upper end of the valve rod (5) is fixedly and rotatably connected with a sealing cover (501), the lower end of the sealing cover (501) is made of a magnetic material, and the lower end of the sealing cover (501) is adsorbed to the upper end of the valve rod (5).

8. A shut-off valve adapted for use with high temperature fluids as claimed in claim 7, wherein: the upper end of the sealing cover (501) is fixedly connected with a pull ring (502), and the pull ring (502) is made of stainless steel materials.

9. A shut-off valve adapted for use with high temperature fluids as claimed in claim 8, wherein: the inner wall fixedly connected with buffer layer (503) of pull ring (502), buffer layer (503) adopt the silica gel material to make.