Liquid hydrogen jacket stop check valve

Abstract

The invention discloses a liquid hydrogen jacket stop check valve, and relates to the technical field of check valves, the liquid hydrogen jacket stop check valve comprises a valve body, a jacket protection pipe is arranged on the outer wall of the valve body, a sealing cavity is formed between the jacket protection pipe and the outer wall of the valve body, and a liquid outlet pipe and a liquid inlet pipe are arranged on the upper portion and the lower portion of the outer wall of the jacket protection pipe respectively; a liquid outlet valve and a liquid inlet valve are respectively mounted on the liquid outlet pipe and the liquid inlet pipe, and the automatic flow control unit is used for automatically adjusting the flow of liquid entering the sealing cavity in unit time from the liquid inlet pipe according to the temperature of liquid discharged from the liquid outlet pipe. The automatic flow control unit is arranged on the check valve, the liquid inlet flow can be controlled according to the liquid outlet temperature, the heat conduction oil circulation amount is dynamically adjusted, and energy waste is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and particularly to a cryogenic hydrogen jacketed globe check valve. Background Art

[0002] Cryogenic propellants for space rockets generally use liquid hydrogen. Therefore, it is required that the valve material can withstand low temperatures and a device for preventing the backflow of the medium is provided in the auxiliary system pipeline. Its structure can achieve zero leakage to prevent the backflow of the pipeline medium from causing system failures. Generally, a check valve with a jacketed pipe on the outer wall is used.

[0003] When the existing check valve with a jacketed pipe is in use, to ensure that the valve body is not damaged by low temperatures, heat-conducting oil is injected into the sealing cavity formed between the jacketed pipe and the outer wall of the valve body to circulate and heat the valve body, so that the valve body maintains a certain temperature, thereby avoiding low-temperature damage and affecting its service life. However, the existing heat-conducting oil circulation structure has the following problems: First, the heat-conducting oil circulation with a fixed flow rate is difficult to adapt to changes in working conditions, resulting in temperature fluctuations of the valve body and increasing the risk of equipment damage; Second, the heat-conducting oil circulation volume is not dynamically adjusted according to actual needs, causing energy waste, especially significant when the liquid hydrogen delivery volume is small; Therefore, the present application provides a cryogenic hydrogen jacketed globe check valve to meet the requirements. Summary of the Invention

[0004] The purpose of the present application is to provide a cryogenic hydrogen jacketed globe check valve to solve the technical problems raised in the above background art.

[0005] To achieve the above purpose, the present application provides the following technical solution: A cryogenic hydrogen jacketed globe check valve includes a valve body. A jacketed pipe is provided on the outer wall of the valve body. A sealing cavity is formed between the jacketed pipe and the outer wall of the valve body. An outlet pipe and an inlet pipe are respectively provided on the upper and lower parts of the outer wall of the jacketed pipe. An outlet valve and an inlet valve are respectively installed on the outlet pipe and the inlet pipe. It further includes an automatic flow control unit, which automatically adjusts the liquid flow rate entering the sealing cavity per unit time of the inlet pipe according to the temperature of the liquid discharged from the outlet pipe.

[0006] As a preferred implementation manner in this embodiment, the automatic flow control includes a heat insulation housing fixedly sleeved on the outer wall of the outlet pipe. A seal is formed between the heat insulation housing and the outlet pipe. A heat conduction cylinder made of a heat conduction material is fixed in the inner cavity of the heat insulation housing. A low-boiling-point liquid is provided in the inner cavity of the heat conduction cylinder. The upper end of the heat conduction cylinder penetrates through the heat insulation housing. A movable rod made of a heat insulation material is slidably sealed in the inner cavity of the heat conduction cylinder through an elastic ring. A cross plate is fixed to the upper end of the movable rod; A U-shaped plate is slidably arranged on the transverse plate through balls, and a connecting rod is fixed to the lower end of the U-shaped plate; A heavy object is fixed to the end of the manual handle of the liquid inlet valve, and a mounting shaft is fixed to the heavy object. The lower end of the connecting rod is rotatably connected to the mounting shaft.

[0007] As a preferred implementation manner in this embodiment, an auxiliary adjustment unit is further provided for automatically adjusting the opening degree of the liquid outlet valve, thereby controlling the time of the fluid in the sealed cavity.

[0008] As a preferred implementation manner in this embodiment, the auxiliary adjustment unit includes a first toothed plate, a second toothed plate, and a plate body fixedly arranged on the liquid outlet pipe; The first toothed plate is fixedly arranged at the lower end of the transverse plate, and the lower end of the first toothed plate slidably penetrates through the plate body; A rotating shaft is rotatably arranged on the plate body, and a gear and a first bevel gear are coaxially installed on the rotating shaft. The gear is in tooth engagement with the first toothed plate; A toothed ring is fixedly sleeved on the rotating shaft of the liquid outlet valve, and the toothed ring is in tooth engagement with the second toothed plate; A threaded pipe is fixedly embedded in the second toothed plate, and the threaded pipe is threadedly sleeved on a screw rod. The screw rod is rotatably arranged on the plate body, and a second bevel gear meshed with the first bevel gear is arranged at the end of the screw rod.

[0009] As a preferred implementation manner in this embodiment, a limiting unit is further provided for limiting the rising and falling heights of the transverse plate.

[0010] As a preferred implementation manner in this embodiment, the limiting unit includes an F-shaped plate fixedly arranged at the upper end of the heat insulation housing, and limiting screw rods are symmetrically arranged up and down on the F-shaped plate.

[0011] As a preferred implementation manner in this embodiment, a valve flap and an outer pipe with a movable cavity are arranged inside the valve body, and the upper end of the valve flap is slidably arranged in the inner cavity of the outer pipe; A diversion pipe is arranged in the valve body, and the lower end of the diversion pipe extends to a groove arranged at the upper end of the valve flap. The lower end of the diversion pipe is slidably and sealingly connected to the groove through a type sealing ring, and the flow channel of the diversion pipe is communicated with the inner cavity of the groove. The upper end of the diversion pipe is connected to an electromagnetic valve, and the electromagnetic valve is connected to a cylinder through a pipeline.

[0012] In summary, the technical effects and advantages of the present invention: The structure of the present invention is reasonable. An automatic flow control unit is provided on the check valve, which can control the inlet flow according to the outlet temperature, dynamically adjust the circulation amount of the heat transfer oil, and avoid energy waste. In the present invention, an auxiliary adjustment unit is also provided for automatically adjusting the opening degree of the outlet valve. The auxiliary adjustment unit and the automatic flow control unit are used in combination, which can effectively shorten the interval time of adjusting the heat transfer oil flow, accelerate the adjustment process, and further reduce energy waste. Brief Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 It is a front view sectional structure schematic diagram of the present invention; Figure 2 It is Figure 1 the enlarged structure schematic diagram at A in Figure 3 It is Figure 1 the enlarged structure schematic diagram at B in Figure 4 It is Figure 1 the enlarged structure schematic diagram at C in Figure 5 It is Figure 1 the enlarged structure schematic diagram at D in

[0015] In the figure: 1, valve body; 2, valve flap; 3, diversion pipe; 4, flow channel; 5, outer pipe; 6, jacket protection pipe; 7, outlet pipe; 8, inlet pipe; 9, inlet valve; 10, heavy object; 11, mounting shaft; 12, connecting rod; 13, heat insulation housing; 14, heat conduction cylinder; 15, movable rod; 16, cross plate; 17, U-shaped plate; 18, first toothed plate; 19, plate body; 20, first bevel gear; 21, gear; 22, threaded pipe; 23, screw rod; 24, second toothed plate; 25, toothed ring; 26, outlet valve; 27, second bevel gear; 28, F-shaped plate; 29, limit screw rod. Detailed Embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0017] Example: Refer to Figure 1 A liquid hydrogen jacket stop check valve shown in the figure, including a valve body 1, a jacket pipe 6 is arranged on the outer wall of the valve body 1, a sealed cavity is formed between the jacket pipe 6 and the outer wall of the valve body 1, a liquid outlet pipe 7 and a liquid inlet pipe 8 are respectively arranged on the upper and lower outer walls of the jacket pipe 6, a liquid outlet valve 26 and a liquid inlet valve 9 are respectively installed on the liquid outlet pipe 7 and the liquid inlet pipe 8, and an automatic flow control unit is further included, which automatically adjusts the liquid flow rate entering the sealed cavity per unit time of the liquid inlet pipe 8 according to the liquid temperature discharged from the liquid outlet pipe 7.

[0018] By setting the automatic flow control unit to control the liquid inlet flow according to the liquid outlet temperature and dynamically adjusting the heat transfer oil circulation amount, energy waste can be avoided.

[0019] As a preferred implementation manner in this embodiment, as Figure 1-4 shown, the automatic flow control unit includes a heat insulation shell 13 fixedly sleeved on the outer wall of the liquid outlet pipe 7, a seal is formed between the heat insulation shell 13 and the liquid outlet pipe 7, a heat conduction cylinder 14 made of heat conduction material is fixed in the inner cavity of the heat insulation shell 13, and a low-boiling-point liquid is arranged in the inner cavity of the heat conduction cylinder 14. The upper end of the heat conduction cylinder 14 penetrates through the heat insulation shell 13, and a movable rod 15 made of heat insulation material is slidably sealed in the inner cavity of the heat conduction cylinder 14 through an elastic ring, and a cross plate 16 is fixed at the upper end of the movable rod 15; A U-shaped plate 17 is slidably arranged on the cross plate 16 through a ball, and a connecting rod 12 is fixed at the lower end of the U-shaped plate 17; A heavy object 10 is fixed at the end of the manual handle of the liquid inlet valve 9, and a mounting shaft 11 is fixed on the heavy object 10. The lower end of the connecting rod 12 is rotatably connected to the mounting shaft 11.

[0020] The boiling point of the low-boiling-point liquid can be set as required. When the liquid outlet temperature is normally controlled within the range of 45° to 60°, the low-boiling-point liquid can be controlled at about 55°. The heat insulation shell 13 is filled with a heat conduction liquid (such as water); During operation, when the liquid outlet temperature is greater than the set value of 55°, the low-boiling-point liquid inside the heat conduction cylinder 14 is heated through the heat conduction liquid. The low-boiling-point liquid vaporizes, and the internal pressure of the heat conduction cylinder 14 increases, which will cause the movable rod 15 to move upward. As the cross plate 16 moves upward, it will drive the connecting rod 12 to move upward and laterally from right to left. Furthermore, the handle on the liquid inlet valve 9 will rotate clockwise, reducing the liquid inlet amount of the heat transfer oil per unit time. When the liquid outlet temperature is lower than 55°, the connecting rod 12 slowly returns to its original position, and its handle rotates counterclockwise, increasing the liquid inlet amount of the heat transfer oil per unit time, so that the liquid inlet amount of the heat transfer oil is always in real-time adjustment, dynamically adjusting the heat transfer oil circulation amount, and reducing energy waste.

[0021] It should be noted that the opening and closing degrees of the valves on the existing liquid inlet pipe 8 and the liquid outlet pipe 7 are the maximum opening and closing degrees under normal conditions (in this state, the flow rate cannot be adjusted according to actual needs, resulting in a great waste of energy), and the above structure is adapted to this state.

[0022] As a preferred implementation mode in this embodiment, an auxiliary adjustment unit is further provided for automatically adjusting the opening and closing degree of the liquid outlet valve 26, thereby controlling the time of the fluid in the sealed cavity.

[0023] When the liquid outlet temperature exceeds 55°, the opening and closing degree of the liquid outlet valve 26 can be controlled by the auxiliary adjustment unit. Specifically, the opening and closing degree of the liquid outlet valve 26 is reduced, so that the liquid outlet volume per unit time is reduced, and the time of the heat-conducting oil in the sealed cavity is increased; When the liquid outlet temperature is lower than 55°, the opening and closing degree of the liquid outlet valve 26 is increased, so that the liquid outlet volume per unit time is increased, and the time of the heat-conducting oil in the sealed cavity is reduced; The auxiliary adjustment unit and the automatic flow control unit are used in cooperation, which can effectively shorten the interval time of the heat-conducting oil flow rate adjustment, speed up the adjustment process, and further reduce energy waste.

[0024] As a preferred implementation mode in this embodiment, as Figure 5 shown, the auxiliary adjustment unit includes a first toothed plate 18, a second toothed plate 24, and a plate body 19 fixedly arranged on the liquid outlet pipe 7; The first toothed plate 18 is fixedly arranged at the lower end of the cross plate 16, and the lower end of the first toothed plate 18 slidably penetrates through the plate body 19; A rotating shaft is rotatably arranged on the plate body 19, and a gear 21 and a first bevel gear 20 are coaxially installed on the rotating shaft. The gear 21 is in tooth engagement with the first toothed plate 18; A toothed ring 25 is fixedly sleeved on the rotating shaft of the liquid outlet valve 26, and the toothed ring 25 is in tooth engagement with the second toothed plate 24; A threaded pipe 22 is fixedly embedded on the second toothed plate 24, and the threaded pipe 22 is threadedly sleeved on a screw rod 23. The screw rod 23 is rotatably arranged on the plate body 19, and a second bevel gear 27 meshed with the first bevel gear 20 is arranged at the end of the screw rod 23.

[0025] When the cross plate 16 moves upward, the upward moving first toothed plate 18 drives the rotating shaft to rotate through the gear 21, and the rotation of the screw rod 23 is driven by the meshing connection of the first bevel gear 20 and the second bevel gear 27, so that the second toothed plate 24 moves to the right, and the rotating shaft of the liquid outlet valve 26 rotates clockwise, and the opening and closing degree continuously decreases, and the liquid outlet volume decreases; When the cross plate 16 moves downward, the screw rod 23 will rotate in the reverse direction, causing the second toothed plate 24 to move to the left, and the rotating shaft of the liquid outlet valve 26 rotates counterclockwise, and the opening and closing degree continuously increases, and the liquid outlet volume increases; The auxiliary regulating unit and the automatic flow control unit are adjusted synchronously, which can effectively shorten the interval time of thermal oil flow adjustment, speed up the adjustment process, and further reduce energy waste.

[0026] As a preferred implementation in this embodiment, a limiting unit is further provided to limit the rising and falling heights of the transverse plate 16 .

[0027] The rising and falling distances of the horizontal plate 16 can be limited by the limit unit as needed, thereby controlling the adjustment range of the handle and the rotating shaft to achieve more precise flow regulation of the heat transfer oil.

[0028] As a preferred implementation in this embodiment, Figure 4 As shown, the limiting unit includes an F-shaped plate 28 fixedly arranged at the upper end of the heat-insulating shell 13, and limiting screws 29 are symmetrically arranged on the F-shaped plate 28.

[0029] The personnel can change the distance between the ends of the upper and lower limit screws 29 and the cross plate 16 by rotating the limit screw 29, thereby limiting the rising and falling distances of the cross plate 16.

[0030] As a preferred implementation in this embodiment, Figure 1 As shown, a valve flap 2 and an outer tube 5 with a movable cavity are arranged inside the valve body 1, and the upper end of the valve flap 2 is slidably arranged in the inner cavity of the outer tube 5; A flow guide pipe 3 is arranged in the valve body 1, and the lower end of the flow guide pipe 3 extends to a groove arranged at the upper end of the valve disc 2, the lower end of the flow guide pipe 3 is slidingly sealedly connected to the groove through an O-ring, and the flow channel 4 of the flow guide pipe 3 is communicated with the inner cavity of the groove, the upper end of the flow guide pipe 3 is connected to the solenoid valve, and the solenoid valve is connected to the cylinder through a pipeline.

[0031] The movable end (the telescopic end of which is located in the inner cavity of the pipeline and forms a sliding seal with the inner wall of the pipeline through an elastic sleeve) of the air cylinder (which can also be replaced by an electric telescopic cylinder) is extended, so that the air pressure in the pipeline and the flow channel 4 increases, causing the valve flap 2 to move downward to block the liquid flow. Pneumatic blocking has a good blocking effect. When the movable end returns to its original position, the valve flap 2 moves upward to return to its original position, thereby releasing the blockage.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid hydrogen jacketed stop check valve, comprising a valve body (1), a jacket protective tube (6) being arranged on the outer wall of the valve body (1), a sealed cavity being formed between the jacket protective tube (6) and the outer wall of the valve body (1), a liquid outlet pipe (7) and a liquid inlet pipe (8) being arranged on the upper and lower outer walls of the jacket protective tube (6), a liquid outlet valve (26) and a liquid inlet valve (9) being installed on the liquid outlet pipe (7) and the liquid inlet pipe (8), respectively, wherein: It also includes an automatic flow control unit, which automatically adjusts the flow rate of liquid entering the sealed cavity through the liquid inlet pipe (8) per unit time according to the temperature of the liquid discharged from the liquid outlet pipe (7).

2. A liquid hydrogen jacketed stop check valve according to claim 1, characterized in that: The automatic flow control unit comprises a heat-insulating shell (13) fixedly sleeved on the outer wall of the liquid outlet pipe (7), a seal is formed between the heat-insulating shell (13) and the liquid outlet pipe (7), a heat-conducting cylinder (14) made of a heat-conducting material is fixed in the inner cavity of the heat-insulating shell (13), and a low-boiling-point liquid is arranged in the inner cavity of the heat-conducting cylinder (14), the upper end of the heat-conducting cylinder (14) passes through the heat-insulating shell (13), and a movable rod (15) made of a heat-insulating material is arranged in the inner cavity of the heat-conducting cylinder (14) through an elastic ring sliding seal, and a horizontal plate (16) is fixed to the upper end of the movable rod (15); A U-shaped plate (17) is provided on the transverse plate (16) via ball sliding, and a connecting rod (12) is fixed to the lower end of the U-shaped plate (17); A weight (10) is fixed to the end of the manual handle of the liquid inlet valve (9), and a mounting shaft (11) is fixed to the weight (10), and the lower end of the connecting rod (12) is rotatably connected to the mounting shaft (11).

3. A liquid hydrogen jacketed stop check valve according to claim 2, characterized in that: An auxiliary regulating unit is also provided, which is used to automatically adjust the opening and closing degree of the liquid outlet valve (26), thereby controlling the time the fluid stays in the sealed cavity.

4. A liquid hydrogen jacketed stop check valve according to claim 3, characterized in that: The auxiliary adjustment unit comprises a first tooth plate (18), a second tooth plate (24), and a plate body (19) fixedly arranged on the liquid outlet pipe (7); The first tooth plate (18) is fixedly arranged at the lower end of the transverse plate (16), and the lower end of the first tooth plate (18) slides through the plate body (19); A rotating shaft is rotatably arranged on the plate body (19), and a gear (21) and a first bevel gear (20) are coaxially mounted on the rotating shaft, and the gear (21) is gear-connected with the first gear plate (18); A toothed ring (25) is fixedly sleeved on the rotating shaft of the liquid outlet valve (26), and the toothed ring (25) is tooth-engaged with the second toothed plate (24); A threaded tube (22) is fixedly embedded on the second tooth plate (24), and the threaded tube (22) is threadedly sleeved on a screw rod (23). The screw rod (23) is rotatably arranged on the plate body (19), and a second bevel gear (27) meshingly connected to the first bevel gear (20) is arranged at the end of the screw rod (23).

5. A liquid hydrogen jacketed stop check valve according to claim 2, characterized in that: A limiting unit is also provided for limiting the rising and falling heights of the transverse plate (16).

6. A liquid hydrogen jacketed stop check valve according to claim 5, characterized in that: The limiting unit comprises an F-shaped plate (28) fixedly arranged on the upper end of the heat-insulating shell (13), and limiting screw rods (29) are symmetrically arranged on the F-shaped plate (28).

7. The liquid hydrogen jacketed stop check valve according to claim 1, characterized in that: The valve body (1) is provided with a valve flap (2) and an outer tube (5) with a movable cavity inside, and the upper end of the valve flap (2) is slidably arranged in the inner cavity of the outer tube (5); The valve body (1) is provided with a flow guide tube (3), and the lower end of the flow guide tube (3) extends to a groove provided at the upper end of the valve disc (2), the lower end of the flow guide tube (3) is connected to the groove in a sliding seal via a (0) type sealing ring, and the flow channel (4) of the flow guide tube (3) is communicated with the inner cavity of the groove, the upper end of the flow guide tube (3) is connected to the electromagnetic valve, and the electromagnetic valve is connected to the cylinder via a pipeline.

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