CN116498756A

CN116498756A - Low-temperature valve

Info

Publication number: CN116498756A
Application number: CN202310593538.7A
Authority: CN
Inventors: 王青青; 候天杰; 杨召; 孔巍; 崔丽丽; 韩文雅; 刘亚忠; 张阳
Original assignee: Beijing Zhongke Fu Hai Low Temperature Technology Co ltd
Current assignee: Beijing Zhongke Fu Hai Low Temperature Technology Co ltd
Priority date: 2023-05-23
Filing date: 2023-05-23
Publication date: 2023-07-28

Abstract

The invention relates to the technical field of low-temperature fluid transportation, in particular to a low-temperature valve. The embodiment of the invention provides a low-temperature valve, which comprises a valve body, a valve rod and a sealing telescopic unit; the valve body is of a hollow structure and comprises a first port, a second port and a third port which are communicated with the inside of the valve body, the sealing telescopic unit comprises a telescopic piece and a valve core, the telescopic piece comprises a cylinder with an axial telescopic function, one end of the telescopic piece is fixedly connected with the first port in a sealing way, the other end of the telescopic piece is positioned in the valve body and is fixedly connected with the valve core in a sealing way, and the valve rod penetrates through the telescopic piece to be connected with the valve core; the valve is characterized in that a baffle is arranged in the valve body, a through hole is formed in the baffle, and the valve rod is used for driving the valve core to block or open the through hole, so that communication and blocking between the first port and the second port are realized. The embodiment of the invention provides a low-temperature valve, which can maintain an excellent sealing effect at low temperature.

Description

Low-temperature valve

Technical Field

The invention relates to the technical field of low-temperature fluid transportation, in particular to a low-temperature valve.

Background

With the development of technology, more and more devices are required to operate at low temperatures. At present, body temperature environments are mainly provided for these high-tech devices by cryogenic fluids. In particular, the flow-controllable cryogenic fluid is provided to the user, mainly by the cooperation of pipes and valves.

In the related art, the low-temperature valve mainly realizes a sealing function through a sealing ring prepared from rubber. However, the sealing effect is reduced due to the shrinkage of the material size at low temperature, and the sealing effect of the valve is continuously reduced over time as the number of times the valve is opened is increased and the sealing material is worn.

Therefore, in order to address the above-described drawbacks, there is an urgent need for a low-temperature valve that maintains an excellent sealing effect at low temperatures.

Disclosure of Invention

The embodiment of the invention provides a low-temperature valve, which can maintain an excellent sealing effect at low temperature.

The embodiment of the invention provides a low-temperature valve, which comprises a valve body, a valve rod and a sealing telescopic unit;

the valve body is of a hollow structure and comprises a first port, a second port and a third port which are communicated with the inside of the valve body, the sealing telescopic unit comprises a telescopic piece and a valve core, the telescopic piece comprises a column body with an axial telescopic function, one end of the telescopic piece is fixedly connected with the first port in a sealing way, the other end of the telescopic piece is positioned in the valve body and is fixedly connected with the valve core in a sealing way, and the valve rod penetrates into the telescopic piece to be connected with the valve core;

the valve is characterized in that a partition plate is arranged in the valve body, a through hole is formed in the partition plate, and the valve rod is used for driving the valve core to block or open the through hole, so that communication and blocking between the first through hole and the second through hole are achieved.

In one possible design, the valve further comprises a sleeve, one end of the sleeve is fixed with the first through hole or the telescopic piece in a sealing mode, the valve rod penetrates through the sleeve and is connected with the sleeve in a threaded mode, and the positions of the valve rod and the valve core in the valve body are adjusted through threaded matching of the sleeve and the valve rod.

In one possible design, the expansion piece and the valve core are fixed in a sealing manner through a limiting cushion block, a boss is arranged at one end of the valve rod, a groove is formed in the valve core, the boss is inserted into the groove, the limiting cushion block comprises a connecting portion and a limiting portion, the expansion piece and the valve core are fixed in a sealing manner through the connecting portion, and the limiting portion is embedded into the groove to abut against the surface, facing the valve rod, of the boss, so that the boss is limited in the groove.

In one possible design, the expansion piece is fixed at the first through hole in a sealing way through a guiding structure, the guiding structure is provided with a guiding hole, the valve rod passes through the guiding hole, and the guiding hole is used for guiding the movement direction of the valve rod so that the through hole is blocked by the guiding hole.

In one possible design, the first port inner wall is provided with a mesa for providing the guiding structure.

In one possible design, the cross-sectional radius of the end of the sleeve connected to the first port is increased progressively so that the dimension of the end of the sleeve matches the first port, and the end of the sleeve with a larger cross-section is fixedly connected to the first port in a sealing manner.

In one possible design, the valve stem is provided with a hand wheel for rotating the valve stem.

In one possible design, the telescoping member comprises a bellows.

In one possible embodiment, the sealing is achieved by welding.

In one possible design, the sleeve and the valve body are provided with vacuum shells outside, and a vacuum environment is arranged between the vacuum shells and the sleeve and the valve body.

Compared with the prior art, the invention has at least the following beneficial effects:

the first port of the valve body is sealed by a sealing telescopic unit consisting of a telescopic piece and a valve core. The telescopic piece is a hollow cylinder with a telescopic function, one end of the telescopic piece is in sealing connection with the port of the first through hole, and the other end of the telescopic piece enters the first through hole and is in sealing connection with the valve core. The valve rod penetrates into the telescopic piece to be connected with the valve core, and the valve core is driven to block or open the through hole arranged on the partition plate by controlling the up-and-down movement of the valve rod. The two sides of the partition board are respectively communicated with the second port and the third port, and the through holes can be opened and closed by the valve core to realize the communication or disconnection between the second port and the third port of the valve body. The valve body is sealed in a sealing and fixing mode, and the sealing and fixing mode can be welding. The method provided by the invention abandons the scheme of sealing rings or gaskets in the prior art, and although the rubber seal has a sealing function, the rubber seal is not fixedly connected, and the rubber and a device to be sealed can slide, so that a gap exists between the device to be sealed and the rubber, the gap is deformed and increased at a low temperature, or the rubber is worn in the using process, and the phenomena can increase the leakage rate of the low-temperature valve. The sealing and fixing mode keeps the whole valve body sealed, and the existence of the telescopic piece can allow the valve core to move up and down under the drive of the valve rod. In the whole opening and closing process, the valve rod is not directly contacted with the low-temperature medium all the time, so that the leakage rate is reduced; the whole valve body is fixedly sealed, so that the leakage rate is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a cryogenic valve according to an embodiment of the present invention;

fig. 2 is a schematic partial structure of a cryogenic valve according to an embodiment of the present invention.

In the figure:

1-a valve body;

11-a first port;

12-a second port;

13-a third port;

14-a separator;

141-a through hole;

2-a valve stem;

21-a boss;

3-sealing the telescoping unit;

31-telescoping member;

32-valve core;

4-sleeve;

5-limiting cushion blocks;

51-connecting part;

52 limit parts;

6-guiding structure;

7-a hand wheel;

8-vacuum shell.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.

In the description of embodiments of the present invention, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance unless explicitly specified or limited otherwise; the term "plurality" means two or more, unless specified or indicated otherwise; the terms "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, it should be understood that the terms "upper", "lower", and the like used in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

As shown in fig. 1 to 2, an embodiment of the present invention provides a low temperature valve including a valve body 1, a valve stem 2, and a sealing expansion unit 3;

the valve body 1 is of a hollow structure and comprises a first through hole 11, a second through hole 12 and a third through hole 13 which are communicated with the inside of the valve body, the sealing telescopic unit 3 comprises a telescopic piece 31 and a valve core 32, the telescopic piece 31 comprises a column body with an axial telescopic function, one end of the telescopic piece 31 is fixedly connected with the first through hole 11 in a sealing way, the other end of the telescopic piece 31 is positioned in the valve body 1 and is fixedly connected with the valve core 32 in a sealing way, and the valve rod 2 penetrates the telescopic piece 31 to be connected with the valve core 32;

the valve body 1 is internally provided with a baffle plate 14, the baffle plate 14 is provided with a through hole 141, and the valve rod 2 is used for driving the valve core 32 to block or open the through hole 141, so that the communication and the blocking between the first through hole 11 and the second through hole 12 are realized.

In some embodiments of the present invention, the valve further comprises a sleeve 4, one end of the sleeve 4 is fixed with the first through hole 11 or the telescopic piece 31 in a sealing way, the valve rod 2 is arranged through the sleeve 4 in a penetrating way and is connected with the sleeve 4 in a threaded way, and the positions of the valve rod 2 and the valve core 32 in the valve body 1 are adjusted through the threaded cooperation of the sleeve 4 and the valve rod 2.

The first port 11 of the valve body 1 is sealed by a sealed expansion unit 3 composed of an expansion element 31 and a valve spool 32. The expansion piece 31 is a hollow cylinder with expansion function, one end of the expansion piece 31 is in sealing connection with the port of the first through hole 11, and the other end of the expansion piece 31 enters the first through hole 11 and is in sealing connection with the valve core 32. The valve rod 2 penetrates the telescopic piece 31 to be connected with the valve core 32, and the valve core 32 is driven to block or open the through hole 141 arranged on the partition 14 by controlling the up-and-down movement of the valve rod 2. The second port 12 and the third port 13 are respectively connected to both sides of the partition 14, and the through hole 141 is opened and closed by the valve body 32, so that the second port 12 and the third port 13 of the valve body 1 can be connected or disconnected. The interior of the valve body 1 is sealed in a sealing and fixing manner, and the sealing and fixing can be welding. The method provided by the invention abandons the scheme of sealing rings or gaskets in the prior art, and although the rubber seal has a sealing function, the rubber seal is not fixedly connected, and the rubber and a device to be sealed can slide, so that a gap exists between the device to be sealed and the rubber, the gap is deformed and increased at a low temperature, or the rubber is worn in the using process, and the phenomena can increase the leakage rate of the low-temperature valve. The sealing and fixing manner keeps the whole inside of the valve body 1 sealed, and the existence of the telescopic piece 31 can allow the valve core 32 to move up and down under the drive of the valve rod 2. In the whole opening and closing process, the valve rod 2 is not directly contacted with the low-temperature medium all the time, so that the leakage rate is reduced; the whole valve body 1 is fixedly sealed, so that the leakage rate is reduced.

In some embodiments of the present invention, the expansion element 31 and the valve core 32 are fixed in a sealing manner through the limit cushion block 5, one end of the valve rod 2 is provided with the boss 21, the valve core 32 is provided with the groove, the boss 21 is inserted into the groove, the limit cushion block 5 comprises a connecting part 51 and a limit part 52, the expansion element 31 and the valve core 32 are fixed in a sealing manner through the connecting part 51, and the limit part 52 is embedded into the groove to abut against the surface of the boss 21 facing the valve rod 2, so that the boss 21 is limited in the groove.

In this embodiment, the expansion piece 31 and the valve core 32 are fixed together by a limit pad 5 in a sealing manner, and the longitudinal section of the limit pad 5 is Z-shaped and includes a connecting portion 51 and a limit portion 52. One end of the connecting portion 51 is fixed with the expansion piece 31 in a sealing manner, the other end of the connecting portion is fixed with the valve core 32 in a sealing manner, the limiting portion 52 is embedded into the groove along the inner wall of the groove of the valve core 32, the back surface of the boss 21 at one end of the valve rod 2 is propped against the bottom of the groove, and the front surface of the boss 21 is propped against the bottom of the groove, that is, the boss 21 is limited in the groove by the limiting portion 52 and the valve core 32. When the valve rod 2 is rotated, the valve rod 2 and the valve core 32 are not completely fixed, and the valve core 32 is fixed with the valve body 1 through the limit cushion block 5 and the telescopic piece 31, so that the valve core 32 cannot rotate when the valve rod 2 rotates, but the valve rod 2 can drive the valve core 32 to move up and down to close or open the through hole 141.

In some embodiments of the present invention, the expansion member 31 is sealingly fixed to the first port 11 by the guide structure 6, and the guide structure 6 is provided with a guide hole through which the valve stem 2 passes, the guide hole being for guiding the movement direction of the valve stem 2 so as to block the through hole 141.

In this embodiment, in order to ensure that the movement direction of the valve rod 2 is unchanged, so that it can accurately reach the position where the through hole 141 is located, a guide structure 6 is provided, the guide structure 6 is provided with a guide hole, and the axial direction of the guide hole is the direction in which the valve rod 2 needs to move. The outer diameter of the valve rod 2 is the same as the inner diameter of the guide hole, so that it is possible to ensure that the direction of up-and-down movement of the valve rod 2 coincides with the axial direction of the guide hole, i.e., to ensure that the valve rod 2 moves in a predetermined direction.

In some embodiments of the invention, the inner wall of the first through opening 11 is provided with a table top for arranging the guiding structure 6.

In this embodiment, the guide structure 6 is fixedly connected to the valve body 1 in a sealing manner, and before connection, it is necessary to ensure that the position of the guide structure 6 is correct, i.e. that the direction of the guide hole is correct. Therefore, the mesa structure is arranged, and before the guide structure 6 and the valve body 1 are connected, the guide structure 6 is placed on the mesa, so that the sealing and fixed connection is performed after the position of the guide structure is correct.

In some embodiments of the present invention, the cross-sectional radius of the end of the sleeve 4 connected to the first port 11 is increased so that the dimension of the end of the sleeve 4 matches the dimension of the first port 11, and the end of the sleeve 4 with a larger cross-section is fixedly connected to the first port 11 in a sealing manner.

In the present embodiment, since the guide structure 6 has a guide function, fixing the sleeve 4 to the guide structure 6 may cause a positional deviation thereof, thereby losing the guide function. Therefore, the sleeve 4 is fixed at the port of the first through hole 11 of the valve body 1, the port surface of the first through hole 11 is large in thickness, large in size, stable in connection and convenient to weld. The part of the sleeve 4 far away from the valve body 1 is thinner, and the section is smaller, so that the arrangement is beneficial to reducing the loss of cold.

In some embodiments of the invention, the valve stem 2 is provided with a hand wheel 7, the hand wheel 7 being used to rotate the valve stem 2.

In this embodiment, the valve rod 2 is provided with the hand wheel 7, and the valve rod 2 can be rotated conveniently by the hand wheel 7. The end of the valve rod 2 is provided with a milling flat section, and the rectangular hole on the hand wheel 7 is matched with the milling flat section to realize the function that the hand wheel 7 drives the valve rod 2 to rotate. After the hand wheel 7 is sleeved into the valve rod 2, the hand wheel 7 is fixed on the valve rod 2 through the matching of nuts and threads.

In some embodiments of the invention, the telescoping member 31 comprises a bellows.

In the present embodiment, the bellows as the expansion member 31 has the following advantages: the scalability is strong, easy to weld.

In some embodiments of the invention, the sealing fixation is achieved by welding.

In this embodiment, the welding can seal and fix different devices, and the connection has excellent connection strength, and is suitable for metal devices.

The black part of the joint in the figure is a weld.

In some embodiments of the present invention, the vacuum housing 8 is disposed outside the sleeve 4 and the valve body 1, and a vacuum environment is provided between the vacuum housing 8 and the sleeve 4 and the valve body 1.

In this embodiment, the vacuum environment is advantageous in preventing loss of cold.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The low-temperature valve is characterized by comprising a valve body (1), a valve rod (2) and a sealing telescopic unit (3);

the valve body (1) is of a hollow structure and comprises a first through hole (11), a second through hole (12) and a third through hole (13) which are communicated with the inside of the valve body, the sealing telescopic unit (3) comprises a telescopic piece (31) and a valve core (32), the telescopic piece (31) comprises a cylinder with an axial telescopic function, one end of the telescopic piece (31) is fixedly connected with the first through hole (11) in a sealing mode, the other end of the telescopic piece (31) is located in the valve body (1) and fixedly connected with the valve core (32) in a sealing mode, and the valve rod (2) penetrates into the telescopic piece (31) to be connected with the valve core (32);

be provided with baffle (14) in valve body (1), be provided with through-hole (141) on baffle (14), valve rod (2) are used for driving case (32) are in order to shutoff or open through-hole (141), and then realize the intercommunication and shutoff between first opening (11) and second opening (12).

2. The cryogenic valve according to claim 1, further comprising a sleeve (4), wherein one end of the sleeve (4) is sealingly fixed to the first through-opening (11) or the expansion element (31), the valve stem (2) is threaded through the sleeve (4) and is screwed to the sleeve (4), and the positions of the valve stem (2) and the valve core (32) in the valve body (1) are adjusted by threaded engagement of the sleeve (4) and the valve stem (2).

3. The low-temperature valve according to claim 2, characterized in that the telescopic piece (31) and the valve core (32) are fixed in a sealing way through a limit cushion block (5), one end of the valve rod (2) is provided with a boss (21), the valve core (32) is provided with a groove, the boss (21) is inserted into the groove, the limit cushion block (5) comprises a connecting part (51) and a limit part (52), the telescopic piece (31) and the valve core (32) are fixed in a sealing way through the connecting part (51), and the limit part (52) is embedded into the groove to abut against the surface of the boss (21) facing the valve rod (2), so that the boss (21) is limited in the groove.

4. The cryogenic valve according to claim 1, characterized in that the expansion element (31) is sealingly fixed to the first through opening (11) by means of a guiding structure (6), the guiding structure (6) being provided with a guiding hole through which the valve stem (2) passes, the guiding hole being adapted to guide the movement direction of the valve stem (2) such that it closes the through opening (141).

5. The cryogenic valve according to claim 4, characterized in that the inner wall of the first through opening (11) is provided with a table top for arranging the guiding structure (6).

6. The cryogenic valve according to claim 2, characterized in that the cross-sectional radius of the end of the sleeve (4) connected to the first through opening (11) is increased so that the dimension of the end of the sleeve (4) matches the first through opening (11), and the end of the sleeve (4) with a larger cross-section is fixedly connected to the first through opening (11) in a sealing manner.

7. A cryogenic valve according to claim 2, characterized in that the valve stem (2) is provided with a hand wheel (7), the hand wheel (7) being used for rotating the valve stem (2).

8. Cryogenic valve according to claim 1, characterized in that the telescopic element (31) comprises a bellows.

9. Cryogenic valve according to any of claims 1-8, wherein the sealing fixation is achieved by welding.

10. The cryogenic valve according to claim 2, characterized in that a vacuum housing (8) is arranged outside the sleeve (4) and the valve body (1), and a vacuum environment is arranged between the vacuum housing (8) and the sleeve (4) and the valve body (1).