Low leakage heat loss liquid hydrogen stop valve

Abstract

The application discloses a low-heat-leakage liquid hydrogen stop valve, which comprises a valve body, a valve cover, a valve rod, a valve core and a hand wheel, the valve cover is installed on the upper part of the valve body, the valve rod penetrates through the valve cover, the inner end of the valve rod is linked with the valve core, a valve seat is arranged in the valve body and is in sealing cooperation with the valve core, and the outer end of the valve rod is linked with the hand wheel; a fixing rod is further installed on the valve cover, a shaft sleeve in thread cooperation with the valve rod is arranged on the upper part of the fixing rod, a bolt is movably arranged on the shaft sleeve in the radial direction, an unlocking slot and a locking slot for respectively inserting the bolt when being opened and closed are arranged on the valve rod, a pressure sensing device for abutting against the inner wall of the unlocking slot or the locking slot and detecting an axial force is installed on the inner end of the bolt, an alarm device is installed on the outer end of the bolt, and the pressure sensing device is electrically connected with the alarm device.

Description

Technical Field

[0001] This application relates to the field of shut-off valve technology, and in particular to a liquid hydrogen shut-off valve with low heat leakage. Background Technology

[0002] Cryogenic shut-off valves, as shut-off devices, are mainly used in industrial pipelines for special media such as ethylene, propylene, propane, ethane, acetylene, methane, liquid oxygen, liquid hydrogen, liquefied natural gas, and liquefied petroleum. They are suitable for industries such as petroleum, chemical, liquefied natural gas, and liquefied petroleum transportation. Traditional design concepts often aim to increase the torque between the handwheel and the valve stem / core, hoping to control the valve's opening and closing with minimal force, and this technology is quite mature. However, the following two problems have arisen: (1) If the handwheel can be turned easily, accidental contact or collision will often cause the valve to open or close abnormally. (2) When the handwheel rotates abnormally, it is impossible to notify the operator in time to handle the situation immediately, making it difficult to stop the loss in time; It is known that the existing patent CN217898992U has an alarm device for abnormal rotation of the handwheel, but it does not have a device to actively lock the rotation of the handwheel. Therefore, we propose a low-heat-leakage liquid hydrogen shut-off valve. Summary of the Invention

[0003] To address the aforementioned problems, this application proposes a low-heat-leakage liquid hydrogen shut-off valve. By installing a pin on the bushing and incorporating an alarm device within the pin, the valve achieves both locking and unauthorized opening alarm functions. Furthermore, the valve stem features a two-section quick-release structure, making overall installation and component casting more convenient and efficient. This low-heat-leakage liquid hydrogen shut-off valve is specifically implemented through the following technical solution: The valve includes a valve body, a valve cover, a valve stem, a valve core, and a handwheel. The valve cover is mounted on the upper part of the valve body, and the valve stem passes through the valve cover. The inner end of the valve stem is linked to the valve core. The valve body has a valve seat that forms a sealing fit with the valve core, and the outer end of the valve stem is linked to the handwheel. A fixing rod is also mounted on the valve cover. The upper part of the fixing rod has a bushing that forms a threaded fit with the valve stem. A pin is radially movable on the bushing. The valve stem has an open locking groove and a closed locking groove for the pin to be inserted into when opening and closing, respectively. A pressure sensing device is installed at the inner end of the pin to abut against the inner wall of the open or closed locking groove and to detect axial force. An alarm device is installed at the outer end of the pin, and the pressure sensing device is electrically connected to the alarm device.

[0004] In a further configuration, a first slot is provided inside the bushing, and a first limiting block is provided on the pin. The first slot is U-shaped. The first limiting block is located inside the first slot and moves along the extension direction of the first slot. This configuration allows the pin to be locked through the first slot, making the overall structure more stable.

[0005] Further, the pin has a second slot for mounting a pressure sensing device. Within this second slot, the pressure sensing device comprises a pressure sensor, an elastic element, and a steel ball, arranged from the inside out. A limiting ring is provided within the second slot. The steel ball is restrained by the limiting ring within a third slot. The preload of the elastic element acts on the steel ball on one side and on the pressure sensor on the other. The surface of the steel ball abuts against the limiting ring under the preload of the elastic element. A protruding portion exists relative to the opening of the second slot, and this protruding portion abuts against the lower side of the open or closed locking slot. With this configuration, the pressure sensing device can detect pressure changes caused by any abnormal rotation of the valve stem.

[0006] Furthermore, the pin end is provided with a third slot, and a first spring is provided in the third slot. The preload of the first spring acts on the inner end of the third slot at one end and on the inner side of the open or closed locking slot at the other end. Through this setting, the pin is locked in the bushing, and the overall structure is more stable.

[0007] Furthermore, a third limiting block is provided in the third slot, the bottom of the third limiting block is welded to the inner side of the third slot, and a frustum adapted to the diameter of the first spring is provided on the top of the third limiting block; the first spring is sleeved on the outer periphery of the third limiting block. Through this setting, the position of the first spring in the third slot is stable, and the overall structure is more stable.

[0008] In a further configuration, the alarm device includes an alarm indicator light, a buzzer, and a control circuit board. The alarm indicator light, buzzer, and pressure sensor are all electrically connected to the control circuit board via wires. The surface of the pin is provided with mounting holes for mounting the alarm indicator light. The surface of the pin corresponding to the mounting position of the buzzer is provided with a sound-permeable hole for sound to pass through. This configuration makes it easier for the sound of the buzzer to pass through the housing and facilitates the installation of the alarm indicator light.

[0009] Further configuration: the valve stem has a two-section structure, consisting of a first valve stem and a second valve stem; the first valve stem has an axial thread, while the axial surface of the second valve stem is smooth; both the opening locking groove and the closing locking groove are formed on the first valve stem; the end of the first valve stem has a first mounting groove and a first opening radially penetrating the first mounting groove; a second spring and a movable block are disposed within the first mounting groove; one end of the movable block has a limiting edge, which abuts against both ends of the second spring; and under the preload of the second spring, the other end of the movable block penetrates the first opening, with one end of the limiting edge abutting against the inner wall of the first mounting groove; the top of the second valve stem has a second mounting groove adapted to the bottom of the first valve stem, and the inner wall of the second mounting groove has a second opening adapted to the first opening and radially penetrating the second mounting groove; when the first valve stem and the second valve stem are connected, the movable block continuously penetrates the first opening and the second opening. Through this configuration, The production process is simplified by manufacturing the longer valve stem separately; the quick-installation structure also makes it easier to install the valve stem of the gate valve.

[0010] Furthermore, the alarm decoration also includes a reset button, which is mounted on the same plane as the alarm indicator light and the sound-transmitting hole. With this feature, after an alarm is triggered and the situation is resolved, the alarm can be reset and put into a state of alert.

[0011] Furthermore, the inner walls of both the opening and closing locking grooves that come into contact with the pressure sensor are provided with rubber pads. This feature serves to buffer the pressure sensor, ensuring that its sensitivity remains within a suitable range.

[0012] Furthermore, one end of the fixing rod is fixedly connected to the valve cover, and the other end is fixedly connected to the bushing; each fixing rod is provided with reinforcing ribs, which makes the overall structural strength of the connection between the valve cover and the bushing more stable.

[0013] In summary, the low-heat-leaking liquid hydrogen shut-off valve, by setting open and closed locking grooves on the valve stem and providing pins that cooperate with these grooves, effectively locks the valve in both open and closed states. Simultaneously, a pressure sensing device that detects the axial movement of the valve stem provides an alarm function for abnormal opening or closing of the shut-off valve. The valve stem employs a two-section structure and a block design. Therefore, the low-heat-leaking liquid hydrogen shut-off valve possesses locking, alarm, and quick-release functions. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A perspective view of a low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application; Figure 2 A cross-sectional view of the low-heat-leakage liquid hydrogen shut-off valve provided in the embodiments of this application; Figure 3 A cross-sectional view of the pin structure of a low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application; Figure 4 A cross-sectional view of the pressure sensor structure of the low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application; Figure 5 A schematic diagram of the pin structure of the low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application; Figure 6 This is a schematic diagram of the first slotted structure inside the bushing of the low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application; Figure 7-a Left view of the low-heat-leakage liquid hydrogen shut-off valve bushing provided in an embodiment of this application; Figure 7-b A cross-sectional view along direction AA of the low-heat-leakage liquid hydrogen shut-off valve bushing provided in an embodiment of this application; Figure 8-a is a schematic diagram of the third slotted structure inside the pin of the low-heat-leakage liquid hydrogen shut-off valve provided in the embodiment of this application; Figure 8-b is a schematic diagram of the third slotted limiting block structure of the low heat leakage liquid hydrogen shut-off valve provided in the embodiment of this application; Figure 9 A cross-sectional view of the quick-assembly structure of the stem of the low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application; Figure 10 This is a schematic diagram of the stem structure of a low-heat-leakage liquid hydrogen shut-off valve provided in an embodiment of this application.

[0016] The following are the labeling elements in the figure: 1. Valve stem; 1.1. First stage valve stem; 1.2. Second stage valve stem; 2. Handwheel; 3. Valve body; 4. Valve cover; 5. Valve core; 6. Valve seat; 7. Fixing rod; 8. Bushing; 9. Pin; 10. Open locking groove; 11. Closed locking groove; 12. Pressure sensing device; 13. Alarm device; 14. First slot; 15. First limit block; 16. Second slot; 17. Pressure sensor; 18. Elastic element; 19. Steel ball; 20. Limit ring; 21. Protrusion Part; 22. Third slot; 22.2. First spring; 23. Third limit block; 24. Frustum; 25. Alarm indicator light; 26. Buzzer; 27. Mounting hole; 28. Sound hole; 29. ​​First mounting slot; 30. First opening; 31. Second spring; 32. Movable block; 33. Limiting edge; 34. Second opening; 35. Second mounting slot; 36. Cover plate; 37. Control circuit board; 38. Rubber pad; 40. Reinforcing rib; 41. Reset button. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments.

[0019] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments: Please refer to the following: Figures 1 to 2 In this embodiment, the valve includes a valve body 3, a valve cover 4, a valve stem 1, a valve core 5, and a handwheel 2. The valve cover 4 is installed on the upper part of the valve body 3. The valve stem 1 passes through the valve cover 4, and the inner end of the valve stem 1 is linked to the valve core 5. The valve body 3 is provided with a valve seat 6 that forms a sealing fit with the valve core 5. The outer end of the valve stem 1 is linked to the handwheel 2. A fixing rod 7 is also installed on the valve cover 4. The upper part of the fixing rod 7 is provided with a bushing 8 that forms a threaded fit with the valve stem 1. A pin 9 is radially movably arranged on the bushing 8. The valve stem 1 is provided with an open locking groove 10 and a closed locking groove 11 for the pin 9 to be inserted when opening and closing, respectively. A pressure sensing device 12 is installed on the inner end of the pin 9 for abutting against the inner wall of the open locking groove 10 or the closed locking groove 11 and for detecting axial force. An alarm device 13 is installed on the outer end of the pin 9. The pressure sensing device 12 is electrically connected to the alarm device 13.

[0020] Please see Figure 1In this embodiment, there are a total of three fixing rods 7 that are fixedly connected to the valve cover 4 and the bushing 8. All three fixing rods 7 are fixedly connected by welding, and the distribution of the three fixing rods 7 is as follows: Figure 1 As shown, the bushing 8 is provided with a hole for the pin 9 to be inserted. At the same time, the setting of the pin 9 should avoid conflict with the setting of the fixing rod 7. With this setting, the connection between the bushing 8 and the valve cover 4 is stable, while leaving enough space for the setting of the pin 9.

[0021] Please see Figure 2 In this embodiment, both the opening locking groove 10 and the closing locking groove 11 are provided on a section of valve stem 1.1, and the opening locking groove 10 and the closing locking groove 11 are set as annular grooves on the valve stem 1. The main purpose is to limit the axial displacement of the valve stem 1 while not restricting the rotation of the valve stem 1. The lower side of the opening locking groove 10 and the closing locking groove 11 is provided with a rubber pad 38 at the contact position with the pin 9. The rubber pad 38 is connected to the protruding part 21 of the pressure sensing device 12 inside the pin 9. This setting mainly plays a buffering role, so that the pressure sensor has a buffer to the change of pressure on the valve stem 1, and the alarm device 13 is not immediately triggered by any slight rotation of the handwheel 2.

[0022] Please see Figure 3 and Figure 4 In this embodiment, a second slot 16 is provided at the contact position between the pin 9 and the lower side of the open locking slot 10 or the closed locking slot 11. A pressure sensing device 12 is installed in the slot. The pressure sensing device 12 is configured from the inside to the outside of the second slot 16 as a pressure sensor 17, an elastic element 18, a steel ball 19 and a limiting ring 20. The limiting ring 20 is welded to the opening of the second slot 16. The steel ball 19 is dynamically pressed against the open locking slot 10 and the closed locking slot 11 by the pre-tightening force of the elastic element 18. Within a certain range, the steel ball 19 is always pressed against the lower side of the open locking slot 10 or the closed locking slot 11 when the valve stem 1 rises or falls. With this configuration, the pressure sensing device 12 can sense pressure changes within a dynamic range and determine the degree of vertical displacement of the valve stem 1.

[0023] Please see Figure 5In this embodiment, the surface of the pin 9 is provided with mounting holes 27 for installing the alarm indicator light 25, which facilitates the installation of the alarm indicator light 25; the surface of the pin 9 corresponding to the mounting position of the buzzer 26 is provided with sound-permeable holes 28 to allow sound to pass through, reducing the sound blocked by the buzzer 26 and making the sound louder; the surface of the pin 9 is provided with a reset button. After the alarm device 13 successfully alarms and the abnormal opening problem is resolved, pressing the reset button will cause the alarm device 13 to re-enter the alarm state; it should be noted that the alarm indicator light 25, buzzer 26, reset button, pressure sensor 17 and control circuit board 37 are electrically connected. Through this setting, the various parts of the pin 9 fit together tightly and fully realize the function of pressure alarm.

[0024] Please see Figure 5 As shown in Figure 8, in this embodiment, the end of the pin 9 is provided with a third slot 22, and a third limiting block 23 is welded inside the third slot 22. A frustum 24 is provided at the top of the third limiting block 23. The first spring 22.2 is disposed in the third slot 22 and sleeved on the outer periphery of the third limiting block 23. The function of the third limiting block 23 is to stabilize the position of the first spring 22.2 and slightly fix it to prevent the first spring 22.2 from falling out of the third slot 22. The preload of the first spring 22.2 acts on the valve stem 1. The bushing 8 is provided with a first slot 14 at the inner side of the insertion hole of the pin 9. The first slot 14 is U-shaped. The pin 9 is provided with a first slot 24 that matches the first slot 14. A limiting block 15 enters from one end of the U-shaped groove, rotates 45° clockwise, and then, under the preload of the first spring 22.2, pushes the pin 9, causing the pin 9 to slide the first limiting block 15 to the other end of the U-shaped groove, thus locking the pin 9 within the bushing 8. When it is desired to unlock and remove the pin 9, the pin 9 is first squeezed against the preload of the first spring 22.2 while simultaneously rotating 45° counterclockwise, and finally the pin 9 can be removed. This design allows the pin 9 to be easily locked within the bushing 8, and thanks to the preload of the first spring 22.2, the overall structure of the pin 9 within the bushing 8 is more stable, preventing dislocation or loosening due to the overall valve structure.

[0025] Please see Figures 9 to 10In this embodiment, the valve stem 1 has a two-section structure, consisting of a first valve stem 1.1 and a second valve stem 1.2. The first valve stem 1.1 has an axial thread for engaging with the inner thread of the bushing 8. The axial surface of the second valve stem 1.2 is smooth to ensure the overall sealing of the valve. The opening locking groove 10 and the closing locking groove 11 are both formed on the first valve stem 1.1. The end of the first valve stem 1.1 is provided with a first mounting groove 29 and a first opening 30 radially penetrating the first mounting groove 29. A second spring 31 and a movable block 32 are provided in the first mounting groove 29. One end of the movable block 32 is provided with a limiting edge 33. There are two movable blocks 32. One end of the limiting edge 33 of the movable block 32 abuts against both ends of the second spring 31. Under the preload of the second spring 31, one end of the limiting edge 33 of the movable block 32 abuts against the two ends of the second spring 31. The inner wall of the mounting groove 29 is tightly abutted, and the other end passes through the first opening 30. It should be noted that after the first spring 22.2 and the movable block 32 are installed in the first mounting groove 29, a detachable cover plate 36 can be provided or the cover plate 36 can be directly welded on, depending on whether it needs to be disassembled and reassembled, without removing the first spring 22.2 and the movable block 32. The top of the second-section valve stem 1.2 is provided with a second mounting groove 35 that matches the bottom of the first-section valve stem 1.1, and the inner wall of the second mounting groove 35 is provided with a second opening 34 that matches the first opening 30 and radially passes through the second mounting groove 35. During installation, the second mounting groove 35 at the top of the second-section valve stem 1.2 is sleeved on the outer periphery of the first-section valve stem 1.1, and the movable block 32 continuously passes through the first opening 30 and the second opening 34, restricting the axial displacement and radial rotation of the first-section valve stem 1.1 and the second-section valve stem 1.2.

[0026] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A low-heat-leakage liquid hydrogen shut-off valve, characterized in that: The valve includes a valve body (3), a valve cover (4), a valve stem (1), a valve core (5), and a handwheel (2). The valve cover (4) is installed on the upper part of the valve body (3). The valve stem (1) passes through the valve cover (4). The inner end of the valve stem (1) is linked to the valve core (5). The valve body (3) is provided with a valve seat (6) that forms a sealing fit with the valve core (5). The outer end of the valve stem (1) is linked to the handwheel (2). A fixing rod (7) is also installed on the valve cover (4). The upper part of the fixing rod (7) is provided with a threaded fit with the valve stem (1). A bushing (8) is fitted together, and a pin (9) is radially movably arranged on the bushing (8). The valve stem (1) is provided with an open locking groove (10) and a closed locking groove (11) for the pin (9) to be inserted when opening and closing, respectively. A pressure sensing device (12) is installed at the inner end of the pin (9) to abut against the inner wall of the open locking groove (10) or the closed locking groove (11) and to detect axial force. An alarm device (13) is installed at the outer end of the pin (9). The pressure sensing device (12) is electrically connected to the alarm device (13). The pin (9) is provided with a second slot (16) for installing a pressure sensing device (12). The pressure sensing device (12) is configured as a pressure sensor (17), an elastic element (18), and a steel ball (19) from the inside to the outside in the second slot (16). A limiting ring (20) extending inward is provided at the outer end of the second slot (16). The steel ball (19) is limited in the second slot (16) by the limiting ring (20). The preload of the elastic element (18) acts on the steel ball (19) on one side and on the pressure sensor (17) on the other side. The surface of the steel ball (19) abuts against the limiting ring (20) under the preload of the elastic element (18), and there is a protrusion (21) relative to the opening position of the second slot (16). The protrusion (21) abuts against the lower side of the open locking groove (10) or the closed locking groove (11).

2. The low-heat-leakage liquid hydrogen shut-off valve according to claim 1, characterized in that: The bushing (8) is provided with a first slot (14), which is U-shaped; the pin (9) is provided with a first limiting block (15), which is located in the first slot (14) and moves along the extension direction of the first slot (14).

3. The low-heat-leakage liquid hydrogen shut-off valve according to claim 1, characterized in that: The pin (9) has a third slot (22) at its end. A first spring (22.2) is provided in the third slot (22). The preload of the first spring (22.2) is applied at one end to the inner end of the third slot (22) and at the other end to the inner side of the opening locking slot (10) or closing locking slot (11).

4. The low-heat-leakage liquid hydrogen shut-off valve according to claim 3, characterized in that: A third limiting block (23) is provided in the third slot (22). The bottom of the third limiting block (23) is welded to the inner side of the third slot (22). A frustum (24) with a diameter not less than that of the first spring (22.2) is provided on the top of the third limiting block (23). The inner end of the first spring (22.2) is sleeved on the outer periphery of the third limiting block (23).

5. A low-heat-leakage liquid hydrogen shut-off valve according to claim 1, characterized in that: The alarm device (13) includes an alarm indicator light (25), a buzzer (26), and a control circuit board (37). The alarm indicator light (25), the buzzer (26), and the pressure sensor (17) are all electrically connected to the control circuit board (37) via wires. The surface of the pin (9) is provided with a mounting hole (27) for mounting the alarm indicator light (25). The surface of the pin (9) corresponding to the mounting position of the buzzer (26) is provided with a sound-transmitting hole (28) for sound to pass through.

6. A low-heat-leakage liquid hydrogen shut-off valve according to claim 5, characterized in that: The alarm device (13) also includes a reset button, which is mounted on the same plane as the alarm indicator (25) and the sound hole (28).

7. A low-heat-leakage liquid hydrogen shut-off valve according to claim 1, characterized in that: The valve stem (1) has a two-section structure, consisting of a first valve stem (1.1) and a second valve stem (1.2). The first valve stem (1.1) is axially threaded, and the axial surface of the second valve stem (1.2) is smooth. The opening locking groove (10) and closing locking groove (11) are both opened on the first valve stem (1.1). The end of the first valve stem (1.1) is provided with a first mounting groove (29) and a first opening (30) that radially penetrates the first mounting groove (29). A second spring (31) and a movable block (32) are provided in the first mounting groove (29). One end of the movable block (32) is provided with a limiting edge (33), and one end of the limiting edge (33) of the movable block (32) is connected to the second spring. (31) The two ends abut against each other, and under the preload of the second spring (31), the other end of the movable block (32) passes through the first opening (30) and one end of the limiting edge (33) abuts against the inner wall of the first mounting groove (29); the top of the two-section valve stem (1.2) is provided with a second mounting groove (35) that matches the bottom of the first section valve stem (1.1), and the inner wall of the second mounting groove (35) is provided with a second opening (34) that matches the first opening (30) and radially passes through the second mounting groove (35); when the first section valve stem (1.1) and the second section valve stem (1.2) are installed and connected, the movable block (32) continuously passes through the first opening (30) and the second opening (34).

8. A low-heat-leakage liquid hydrogen shut-off valve according to claim 1, characterized in that: The inner walls of the opening locking groove (10) and the closing locking groove (11) that are in contact with the pressure sensing device (12) are provided with rubber pads (38).

9. A low-heat-leakage liquid hydrogen shut-off valve according to claim 1, characterized in that: One end of the fixing rod (7) is welded to the valve cover (4), and the other end is welded to the bushing (8); the fixing rod (7) is provided with reinforcing ribs (40).

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