Liquid hydrogen low-temperature stop valve

Abstract

The utility model relates to the technical field of valves, in particular to a liquid hydrogen low-temperature stop valve which comprises a valve body, a valve clack and a valve rod connected with the valve clack, a medium channel is arranged in the valve body, the valve body is connected with a valve cover, the liquid hydrogen low-temperature stop valve further comprises a vacuum jacket arranged on the outer side of the valve body, and a flange plate extends from one end, close to the valve cover, of the valve body. One end of the vacuum jacket is connected with the flange plate, the other end of the vacuum jacket is connected with the outer wall, corresponding to the medium channel, of the valve body, a vacuum cavity is formed between the vacuum jacket and the valve body, and a first screw plug communicated with the vacuum cavity is arranged at the end, close to the medium channel, of the vacuum jacket. The outer side of the valve body is connected with the vacuum jacket, so that a vacuum state is formed between the vacuum jacket and the valve body, heat exchange between the outer wall of the valve and air is reduced to the maximum extent, heat loss is fully reduced, cooling time is shortened, and a liquid hydrogen medium can be stably conveyed at low temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a liquid hydrogen cryogenic stop valve. Background Art

[0002] Low temperature stop valve refers to a valve whose closing part (valve disc) moves along the center line of the valve seat. According to this movement of the valve disc, the change of the valve seat opening is proportional to the valve disc stroke. Since the valve stem opening or closing stroke of this type of valve is relatively short and has a very reliable shutoff function, and since the change of the valve seat opening is proportional to the valve disc stroke, it is very suitable for regulating flow. Therefore, this type of valve is very suitable for use as a cut-off, regulation and throttling.

[0003] With the rapid development of my country's hydrogen energy industry, the demand for hydrogen energy is showing explosive growth. The normal boiling point of liquid hydrogen at one atmosphere is 20.37K (-252.78℃), and the freezing point is 13.96K (-259.19℃). Due to the low temperature characteristics of liquid hydrogen medium, low temperature stop valves are required to ensure the safety of transportation pipelines.

[0004] However, the cryogenic stop valve in the prior art cannot stably achieve the ultra-low temperature transportation environment of liquid hydrogen, that is, it cannot reduce the heat exchange between the outer wall of the valve and the air, and still causes a large amount of heat loss. Therefore, it is necessary to propose a cryogenic stop valve that can stably and low-temperature transport liquid hydrogen. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a liquid hydrogen cryogenic stop valve. The utility model has a heat insulation structure, that is, a vacuum jacket is connected to the outside of the valve body to form a vacuum state between the vacuum jacket and the valve body, thereby minimizing the heat exchange between the outer wall of the valve and the air, fully reducing heat loss and shortening the cooling time, and being able to stably and low-temperature transport liquid hydrogen medium.

[0006] The technical solution adopted by the utility model is as follows: a liquid hydrogen cryogenic stop valve, comprising a valve body, a valve disc and a valve stem connected to the valve disc, a medium channel being provided inside the valve body, the valve disc being arranged in the medium channel, a valve seat being sealably matched with the valve disc being further provided in the medium channel, the valve body being connected to a valve cover, an end of the valve stem away from the valve disc passing through the valve cover and being connected to a hand wheel, and also comprising a vacuum jacket being provided on the outside of the valve body, a flange extending from one end of the valve body close to the valve cover, one end of the vacuum jacket being connected to the flange and the other end being connected to the outer wall of the valve body at the medium channel corresponding thereto, a vacuum chamber being formed between the vacuum jacket and the valve body, and a first screw plug being connected to the vacuum chamber being provided at the end of the vacuum jacket close to the medium channel.

[0007] The invention also comprises a support frame located in the vacuum chamber, and the support frame is fixedly connected to the outer wall of the valve body.

[0008] The outer wall of the vacuum jacket is provided with a vacuum detection port connected to the vacuum cavity.

[0009] The outer wall of the valve body is coated with a heat insulating wrapping layer.

[0010] An extension tube is arranged between the valve body and the flange, a heat-resistant sleeve is arranged between the valve body and the valve stem, and the heat-resistant sleeve is outer-mounted on the valve stem and extends into the extension tube.

[0011] The valve cover is threadedly connected to the valve body via a stud, one end of the stud passing through the valve cover is threadedly connected to a nut, and a disc spring seat and a first disc spring which are sleeved on the outside of the stud are provided between the nut and the valve cover.

[0012] A second disc spring, a sealing packing, a packing sleeve and a packing gland are arranged in sequence between the valve stem and the valve cover. The packing gland is threadedly connected to the valve cover through a gland bolt. The part of the valve stem located in the valve body is covered with a bellows. One end of the bellows extends between the valve cover and the valve body to form a clamping connection and the other end is fixedly connected to the valve stem.

[0013] The valve cover is provided with a second screw plug communicating with the gap between the bellows and the sealing packing at a position corresponding to the valve stem.

[0014] A bracket is connected to one end of the valve stem close to the hand wheel, a support rod is connected between the bracket and the valve cover, a guide block is radially extended from the support rod, and the guide block extends to the valve stem for the valve stem to pass through.

[0015] The beneficial effects of the utility model are as follows: the utility model has a heat-insulating structure, that is, a vacuum jacket is connected to the outside of the valve body to form a vacuum state between the vacuum jacket and the valve body, thereby minimizing the heat exchange between the outer wall of the valve and the air, fully reducing heat loss and shortening the cooling time, and being able to stably and low-temperature transport liquid hydrogen medium. The vacuum jacket adopts a separate vacuuming form. By removing the first screw plugs on both sides, it can be connected to the flow channel vacuum pipeline, and can be transformed into a form of vacuuming together with the pipeline, meeting various needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1This is a schematic diagram of the structure of the liquid hydrogen cryogenic stop valve of the utility model;

[0018] Figure 2 It is a partial enlarged structural schematic diagram of the valve body in the utility model;

[0019] Figure 3 It is a partial enlarged structural schematic diagram of the valve stem in the utility model;

[0020] Figure 4 It is a partial enlarged structural schematic diagram of the valve cover in the utility model;

[0021] Figure 5 It is a cross-sectional schematic diagram of the guide block in the utility model;

[0022] In the figure, 1-valve body, 2-valve disc, 3-valve stem, 4-medium channel, 5-valve cover, 6-handwheel, 7-vacuum jacket, 8-flange, 9-vacuum chamber, 10-first screw plug, 11-support frame, 12-vacuum detection port, 13-insulating wrapping layer, 14-extension pipe, 15-heat-resistant sleeve, 16-stud, 17-nut, 18-disc spring seat, 19-first disc spring, 20-second disc spring, 21-sealing packing, 22-packing sleeve, 23-packing gland, 24-gland bolt, 25-bellows, 26-second screw plug, 27-bracket, 28-support rod, 29-guide block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0024] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0025] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0026] like Figures 1 to 5As shown, it is an embodiment of the utility model, a liquid hydrogen cryogenic stop valve, comprising a valve body 1, a valve disc 2 and a valve stem 3 connected to the valve disc 2, a medium channel 4 is provided inside the valve body 1, the valve disc 2 is arranged in the medium channel 4, a valve seat which seals with the valve disc 2 is also provided in the medium channel 4, the valve body 1 is connected to a valve cover 5, one end of the valve stem 3 away from the valve disc 2 passes through the valve cover 5 and is connected to a hand wheel 6, and also comprises a vacuum jacket 7 arranged on the outside of the valve body 1, a flange 8 extends from one end of the valve body 1 close to the valve cover 5, one end of the vacuum jacket 7 is connected to the flange 8 and the other end is connected to the outer wall of the valve body 1 corresponding to the medium channel 4, a vacuum chamber 9 is formed between the vacuum jacket 7 and the valve body 1, and the end of the vacuum jacket 7 close to the medium channel 4 is provided with a first screw plug 10 connected to the vacuum chamber 9.

[0027] The beneficial effects of such a configuration are as follows: the utility model has a heat-insulating structure, that is, a vacuum jacket is connected to the outside of the valve body to form a vacuum state between the vacuum jacket and the valve body, thereby minimizing the heat exchange between the outer wall of the valve and the air, substantially reducing heat loss and shortening the cooling time, and being able to stably and low-temperature transport liquid hydrogen medium; the vacuum jacket adopts a separate vacuuming form, and by removing the first screw plugs on both sides, it can be connected to the flow channel vacuum pipeline, and can be transformed into a form of vacuuming together with the pipeline, thereby meeting a variety of needs.

[0028] Further, a support frame 11 is provided in the vacuum chamber 9 , and the support frame 11 is fixedly connected to the outer wall of the valve body 1 .

[0029] The beneficial effects of such arrangement are as follows: the vacuum jacket is supported by the support frame to ensure the stability of the vacuum jacket.

[0030] It is further provided that the outer wall of the vacuum jacket 7 is provided with a vacuum detection port 12 connected to the vacuum chamber 9 .

[0031] The beneficial effects of such a configuration are as follows: the vacuum environment of the vacuum chamber is detected through the vacuum detection port, which is beneficial to maintaining the vacuum environment in the vacuum chamber.

[0032] It is further provided that the outer wall of the valve body 1 is coated with a heat insulating wrapping layer 13 .

[0033] The beneficial effect of such a configuration is as follows: the heat loss of the valve body to the outside is reduced by the heat-insulating wrapping layer, thereby achieving a better cold-keeping effect.

[0034] It is further configured that an extension tube 14 is provided between the valve body 1 and the flange 8 , and a heat-resistant sleeve 15 is provided between the valve body 1 and the valve stem 3 . The heat-resistant sleeve 15 is sleeved on the valve stem 3 and extends into the extension tube 14 .

[0035] The beneficial effects of this arrangement are as follows: the extension tube is used to extend the valve body, design the valve body into a slender structure, lengthen the thermal bridge, and further reduce heat loss. The heat-resistant sleeve fills the gap between the valve stem and the valve body, thereby reducing the heat convection of the liquid hydrogen medium in the valve and preventing the sealing packing and bellows from being overcooled and frosted.

[0036] It is further configured that the valve cover 5 is threadedly connected to the valve body 1 via a stud 16, and the stud 16 passes through one end of the valve cover 5 and is threadedly connected to a nut 17, and a disc spring seat 18 and a first disc spring 19 which are sleeved on the outside of the stud 16 are provided between the nut 17 and the valve cover 5.

[0037] The beneficial effects of such a configuration are as follows: the valve cover and the valve body are connected via a stud thread, which facilitates disassembly and assembly; a first disc spring is installed between the stud and the nut to provide a buffering effect, thereby meeting the sealing requirements of the valve body and the valve cover. Because the disc spring has good strength, high safety, and good buffering and shock-absorbing capabilities, the disc spring seat prevents the first disc spring from being deflected by force, thereby ensuring the stability of the structure.

[0038] It is further configured that a second disc spring 20, a sealing packing 21, a packing sleeve 22 and a packing cover 23 are provided in sequence between the valve stem 3 and the valve cover 5. The packing cover 23 is threadedly connected to the valve cover 5 through a cover bolt 24. The portion of the valve stem 3 located inside the valve body 1 is covered with a bellows 25. One end of the bellows 25 extends between the valve cover 5 and the valve body 1 to form a clamping connection, and the other end is fixedly connected to the valve stem 3.

[0039] The beneficial effects of such arrangement are as follows: good sealing between the valve stem and the valve cover is ensured by sequentially installing the second disc spring, sealing packing, packing sleeve and packing gland; the packing gland is threadedly connected to the valve cover through gland bolts; the valve stem and the valve cover are both provided with upper seals; the sealing packing can be replaced by unscrewing the gland bolts; the design for convenient maintenance enables the valve stem and valve disc to be removed from the valve body; the valve stem and valve disc can be disassembled and the sealing surface can be repaired without disturbing the vacuum environment; the sealing packing cooperates with the bellows to achieve double sealing to ensure zero leakage at the valve stem position.

[0040] It is further provided that a second screw plug 26 is provided at a position of the valve cover 5 corresponding to the valve stem 3 , communicating with the gap between the bellows 25 and the sealing packing 21 .

[0041] The beneficial effect of such arrangement is as follows: a second screw plug is arranged between the bellows and the sealing filler, and when the bellows is damaged and fails, the leakage of the bellows can be detected in time.

[0042] It is further provided that a bracket 27 is connected to one end of the valve stem 3 close to the hand wheel 6, a support rod 28 is connected between the bracket 27 and the valve cover 5, a guide block 29 is radially extended from the support rod 28, and the guide block 29 extends to the valve stem 3 for the valve stem 3 to pass through.

[0043] The beneficial effects of such an arrangement are as follows: the valve stem is guided by the guide block, so that the rotation of the valve stem is more stable and the bellows is prevented from twisting and torsional deformation.

[0044] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A liquid hydrogen cryogenic stop valve, comprising a valve body (1), a valve disc (2), and a valve stem (3) connected to the valve disc (2), wherein a medium passage (4) is provided inside the valve body (1), the valve disc (2) is arranged in the medium passage (4), a valve seat which seals with the valve disc (2) is also provided in the medium passage (4), the valve body (1) is connected to a valve cover (5), and an end of the valve stem (3) away from the valve disc (2) passes through the valve cover (5) and is connected to a hand wheel (6), characterized in that: The invention also comprises a vacuum jacket (7) arranged on the outside of the valve body (1); a flange (8) extends from one end of the valve body (1) close to the valve cover (5); one end of the vacuum jacket (7) is connected to the flange (8) and the other end is connected to the outer wall of the valve body (1) corresponding to the medium channel (4); a vacuum chamber (9) is formed between the vacuum jacket (7) and the valve body (1); and a first screw plug (10) communicating with the vacuum chamber (9) is provided at the end of the vacuum jacket (7) close to the medium channel (4).

2. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: It also includes a support frame (11) located in the vacuum chamber (9), wherein the support frame (11) is fixedly connected to the outer wall of the valve body (1).

3. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: The outer wall of the vacuum jacket (7) is provided with a vacuum detection port (12) connected to the vacuum chamber (9).

4. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: The outer wall of the valve body (1) is coated with a heat insulating wrapping layer (13).

5. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: An extension tube (14) is provided between the valve body (1) and the flange (8), and a heat-resistant sleeve (15) is provided between the valve body (1) and the valve stem (3). The heat-resistant sleeve (15) is externally mounted on the valve stem (3) and extends into the extension tube (14).

6. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: The valve cover (5) is threadedly connected to the valve body (1) via a stud (16); one end of the stud (16) passing through the valve cover (5) is threadedly connected to a nut (17); a disc spring seat (18) sleeved on the outside of the stud (16) and a first disc spring (19) are provided between the nut (17) and the valve cover (5).

7. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: A second disc spring (20), a sealing packing (21), a packing gland (22) and a packing gland (23) are provided in sequence between the valve stem (3) and the valve cover (5); the packing gland (23) is threadedly connected to the valve cover (5) via gland bolts (24); a portion of the valve stem (3) located inside the valve body (1) is covered with a bellows (25); one end of the bellows (25) extends between the valve cover (5) and the valve body (1) to form a clamping connection, and the other end is fixedly connected to the valve stem (3).

8. The liquid hydrogen cryogenic stop valve according to claim 7, characterized in that: A second screw plug (26) is provided at a position of the valve cover (5) corresponding to the valve stem (3) and communicating with the gap between the bellows (25) and the sealing packing (21).

9. The liquid hydrogen cryogenic stop valve according to claim 1, characterized in that: A bracket (27) is connected to one end of the valve stem (3) close to the hand wheel (6); a support rod (28) is connected between the bracket (27) and the valve cover (5); a guide block (29) extends radially from the support rod (28); the guide block (29) extends to the valve stem (3) for the valve stem (3) to pass through.

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