Heat preservation device for cold box of liquid hydrogen pump

Abstract

The utility model belongs to the technical field of cold box heat preservation, and particularly relates to a liquid hydrogen pump cold box heat preservation device. The device comprises a heat preservation cold box arranged outside a liquid hydrogen pump body, a sealing cover arranged at the top of the heat preservation cold box, a sealing cover rapid dismounting and mounting assembly arranged on the heat preservation cold box and used for clamping the sealing cover, a sealing heat preservation assembly arranged between the sealing cover and the heat preservation cold box, and a liquid inlet pipe communicated with the heat preservation cold box. The liquid outlet pipe is communicated with the outlet end of the liquid hydrogen pump body, and the air return pipe is communicated with the heat preservation cold box. The heat preservation cold box is provided with the sealing cover rapid disassembly and assembly assembly used for being connected with the sealing cover in a clamped mode, the clamping block located on the heat preservation cold box is inserted into the clamping groove located in the sealing cover in a mechanical transmission mode, the clamping block is driven to leave the clamping groove, and then the purpose of safely and rapidly disassembling and assembling the sealing cover is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold box insulation, and in particular relates to a liquid hydrogen pump cold box insulation device. Background Art

[0002] Liquid hydrogen pump is a type of cryogenic liquid pump. It is a special pump used to transport cryogenic liquid hydrogen in petroleum, air separation and chemical plants. In order to prevent the temperature of the liquid hydrogen pump from rising and causing the liquid hydrogen to vaporize, the prior art generally requires the use of a special cold box insulation device to keep the liquid hydrogen pump insulated at low temperatures. However, even if the liquid hydrogen pump is operated under strict insulation conditions, the risk of hydrogen leakage cannot be completely eliminated. Liquid hydrogen is a very low-temperature cooling liquid with a boiling point of approximately -253°C, and liquid hydrogen is extremely flammable, so the pump and related systems must be designed to be extremely safe to prevent fire or explosion.

[0003] Most of the existing cold box insulation devices of liquid hydrogen pumps use fixing bolts to fix the cover of the insulation device to the flange of its box during the tightening process. However, during the disassembly and installation of the threaded insulation device, the fixing bolts need to be screwed separately. This loading and unloading method is not only troublesome, but also easy to generate sparks during the screwing process. The ignition point of hydrogen is very low, and only a tiny spark is needed to ignite the hydrogen-air mixture, so there is a safety hazard.

[0004] In summary, there is a need for a liquid hydrogen pump cold box insulation device that is not screw-fastened. Utility Model Content

[0005] The utility model aims to provide a liquid hydrogen pump cold box insulation device. The insulation cold box is provided with a cover quick disassembly assembly for clamping its cover, and the clamping block on the insulation cold box is inserted into the clamping slot on the cover by mechanical transmission, and the clamping block is driven to leave the clamping slot, thereby achieving the purpose of safely and quickly disassembling the cover.

[0006] The technical solution adopted by the utility model to solve the above-mentioned problem is: a liquid hydrogen pump cold box insulation device, comprising an insulation cold box arranged outside the liquid hydrogen pump body, a sealing cover arranged on the top of the insulation cold box, a sealing cover quick disassembly and assembly component arranged on the insulation cold box and used for engaging the sealing cover, a sealing insulation component arranged between the sealing cover and the insulation cold box, a liquid inlet pipe connected to the insulation cold box, a liquid outlet pipe connected to the outlet end of the liquid hydrogen pump body, and a return air pipe connected to the insulation cold box.

[0007] A further preferred technical solution is that the cover quick disassembly assembly includes a screw equidistantly rotatably connected to the outside of the thermal insulation cold box, a movable block threadedly connected to the outside of the screw, a fixed plate equidistantly fixedly connected to the outside of the thermal insulation cold box, a movable block movably arranged on the fixed plate, a connecting rod hinged between the movable block and the movable block, a clamping block fixedly installed on the top of the movable block, and a clamping slot opened on the cover and the thermal insulation cold box.

[0008] A further preferred technical solution is that the sealing and insulation assembly includes an annular groove opened on the top of the insulation cold box, a first low-temperature rubber ring fixedly installed inside the annular groove, a second low-temperature rubber ring fixedly installed inside the annular groove, and an extrusion ring fixedly installed at the bottom of the cover.

[0009] A further preferred technical solution is that the thermal insulation cold box is divided into an outer box and an inner box, and the liquid inlet pipe and the air return pipe are both fixedly connected to the inner box.

[0010] A further preferred technical solution is that a cavity is left between the outer box and the inner box, and the cavity is filled with a thermal insulation layer, which includes perlite, silicate insulation material, polyurethane foam, polystyrene foam, silicon aerogel, vacuum insulation board and other materials.

[0011] A further preferred technical solution is that a guide rod is fixedly mounted on one side of the screw rod and the guide rod is slidably connected to the moving block.

[0012] A further preferred technical solution is that a limiting sliding groove is provided on the fixed plate and the limiting sliding groove is slidably connected to the movable block.

[0013] A further preferred technical solution is that: the cover and the insulated cold box are provided with card slots for installing the card blocks, positioning columns are fixedly connected to both sides of the bottom of the cover, and the top of the insulated cold box is symmetrically provided with positioning slots for installing the positioning columns.

[0014] A further preferred technical solution is that a transmission gear is fixedly connected to the bottom of the screw rod, and the outside of the transmission gear is connected through a transmission belt transmission.

[0015] A further preferred technical solution is that: the diameter of the first low-temperature rubber ring is smaller than the diameter of the second low-temperature rubber ring, a gap is left between the first low-temperature rubber ring and the second low-temperature rubber ring, the length of the gap is smaller than the length of the extrusion ring, the upper parts of the opposing surfaces of the first low-temperature rubber ring and the second low-temperature rubber ring are both inclined inwardly, and both sides of the bottom of the extrusion ring are inclined.

[0016] In summary, the utility model has the following benefits:

[0017] 1. The utility model can drive multiple groups of screws to rotate in the same direction at the same time by rotating one of the screws, and under the transmission cooperation of the transmission gear and the transmission toothed belt, the rotation of the screw drives the threaded movable block to move vertically, and under the hinged cooperation of the movable block and the movable block with the connecting rod, and the sliding cooperation of the movable block with the limiting slide groove, the movable block can be driven to move horizontally, so that the card block can be driven to be inserted into the card slot and driven to leave the card slot, thereby achieving the purpose of safely and quickly disassembling and assembling the cover, simple operation, strong practicality, and effectively improving the efficiency of disassembling, assembling and maintaining the device.

[0018] 2. The utility model can quickly align the card slot on the cover with the card slot on the heat preservation cold box through the positioning column and the positioning groove. At the same time, in the process of inserting the positioning column into the positioning groove, the extrusion ring will be inserted into the gap between the first low-temperature rubber ring and the second low-temperature rubber ring and squeeze the two, so that the first low-temperature rubber ring and the second low-temperature rubber ring will fill the annular groove, thereby playing a good low-temperature insulation effect on the device and further improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the thermal insulation cold box of the utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the cover of the utility model when viewed from above;

[0022] Figure 4 It is a schematic diagram of the longitudinal section structure of the thermal insulation cold box of the utility model.

[0023] In the accompanying drawings, the components represented by each reference numeral are as follows: 1. Insulated cold box; 2. Sealing cover; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Return air pipe; 6. Guide rod; 7. Limit slide groove; 8. Positioning column; 9. Transmission belt; 101. Screw; 102. Moving block; 103. Fixed plate; 104. Movable block; 105. Connecting rod; 106. Block; 107. Slot; 201. Annular groove; 202. First low-temperature rubber ring; 203. Second low-temperature rubber ring; 204. Extrusion ring; 1001. Outer box; 1002. Inner box. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0026] Embodiment 1:

[0027] Please combine Figure 1-4 A liquid hydrogen pump cold box insulation device of the present embodiment includes a liquid hydrogen pump body, an insulation cold box 1 arranged outside the liquid hydrogen pump body, a cover 2 arranged on the top of the insulation cold box 1, a cover quick disassembly assembly component arranged on the insulation cold box 1, a sealing insulation assembly arranged between the cover 2 and the insulation cold box 1, a liquid inlet pipe 3 connected to the insulation cold box 1, a liquid outlet pipe 4 connected to the outlet end of the liquid hydrogen pump body, and a return air pipe 5 connected to the insulation cold box 1, the insulation cold box 1 is divided into an outer box 1001 and an inner box 1002, and the liquid inlet pipe 3 and the return air pipe 5 are both fixedly connected to the inner box 1002.

[0028] The cover quick disassembly assembly assembly includes a screw 101 equidistantly connected to the outside of the heat preservation cold box 1, a moving block 102 threadedly connected to the outside of the screw 101, a fixed plate 103 equidistantly fixedly connected to the outside of the heat preservation cold box 1, a movable block 104 movably arranged on the fixed plate 103, a connecting rod 105 hinged between the movable block 104 and the moving block 102, a clamping block 106 fixedly installed on the top of the movable block 104, and a clamping groove 107 provided on the cover 2 and the heat preservation cold box 1. A guide rod 6 is fixedly installed on one side of the screw 101 and the guide rod 6 is slidably connected to the moving block 102, which can guide the vertical movement of the moving block 102. A limited position is provided on the fixed plate 103. The slide groove 7 and the limiting slide groove 7 are slidably connected with the movable block 104, the block 106 is an I-shaped structure, the slots 107 opened on the cover 2 and the thermal insulation cold box 1 can be spliced ​​into a complete I-shaped slot and matched with the block 106, and the bottom sides of the cover 2 are fixedly connected with positioning columns 8, and the top of the thermal insulation cold box 1 is symmetrically provided with positioning grooves matching the positioning columns 8. Through the cooperation of the positioning columns 8 and the positioning grooves, the slots 107 on the cover 2 can be quickly aligned with the slots 107 on the thermal insulation cold box 1. The bottom of the screw 101 is fixedly connected with a transmission gear, and the outside of the transmission gear is connected through a transmission toothed belt 9 for transmission, so as to drive all the screws 101 to rotate in the same direction at the same time.

[0029] The sealing and heat-insulating assembly includes an annular groove 201 opened on the top of the heat-insulating cold box 1, a first low-temperature rubber ring 202 fixedly installed in the annular groove 201, a second low-temperature rubber ring 203 fixedly installed in the annular groove 201, and an extrusion ring 204 fixedly installed at the bottom of the cover 2. The diameter of the first low-temperature rubber ring 202 is smaller than the diameter of the second low-temperature rubber ring 203. A gap is left between the first low-temperature rubber ring 202 and the second low-temperature rubber ring 203. The length of the gap is slightly smaller than the length of the extrusion ring 204. The upper parts of the opposing surfaces of the first low-temperature rubber ring 202 and the second low-temperature rubber ring 203 are both inclined inwardly, and both sides of the bottom of the extrusion ring 204 are inclined.

[0030] The implementation principle of a liquid hydrogen pump cold box insulation device in the embodiment of the present application is: when the device needs to be maintained, by rotating one of the screw rods 101, and under the transmission cooperation of the transmission gear and the transmission toothed belt 9, it is possible to drive multiple groups of screw rods 101 to rotate in the same direction at the same time, and the rotation of the screw rod 101 drives the threaded movable block 102 to move vertically upward, and under the hinged cooperation of the movable block 102 and the movable block 104 and the connecting rod 105, and the sliding cooperation of the movable block 104 and the limiting slide groove 7, it is possible to drive the movable block 104 to move horizontally outward, thereby driving the clamping block 106 to leave the clamping groove 107, thereby realizing the rapid disassembly of the cover 2 For the purpose, when the maintenance of the device is completed, the positioning column 8 is aligned with the positioning groove and inserted, and in the process of inserting the positioning column 8 into the positioning groove, the extrusion ring 204 will be inserted into the gap between the first low-temperature rubber ring 202 and the second low-temperature rubber ring 203 and squeeze the two, so that the first low-temperature rubber ring 202 and the second low-temperature rubber ring 203 will fill the annular groove 201, thereby playing a good low-temperature insulation effect on the device. At the same time, the card slot 107 on the cover 2 will be aligned with the card slot 107 on the insulation cold box 1, and the cover 2 and the insulation cold box 1 can be quickly connected and fixed by reversing the screw 101 to drive the card block 106 to be reinserted into the card slot 107.

[0031] In addition, a further improvement is that a cavity is left between the outer box 1001 and the inner box 1002, and the cavity can play a role in heat preservation. The interior of the cavity is filled with silicon aerogel, which can improve the heat preservation effect.

[0032] In addition, the same or similar element symbols are used to refer to the same or similar parts or steps in the drawings and descriptions as much as possible. The drawings are presented in simplified form and are not drawn to exact scale. For convenience and clarity only, directional terms such as top, bottom, left, right, upward, above, above, below, below, behind, and in front may be used with respect to the drawings. These and similar directional terms should not be construed as limiting the scope of the present disclosure in any way.

Claims

1. A liquid hydrogen pump cold box insulation device, characterized in that: include: A heat preservation cold box (1) is arranged outside the liquid hydrogen pump body, a cover (2) is arranged on the top of the heat preservation cold box (1), a cover quick disassembly assembly component is arranged on the heat preservation cold box (1) and is used to engage the cover (2), a sealing heat preservation assembly is arranged between the cover (2) and the heat preservation cold box (1), a liquid inlet pipe (3) connected to the heat preservation cold box (1), a liquid outlet pipe (4) connected to the outlet end of the liquid hydrogen pump body, and a gas return pipe (5) connected to the heat preservation cold box (1).

2. A liquid hydrogen pump cold box insulation device according to claim 1, characterized in that: The cover quick disassembly assembly comprises a screw (101) rotatably connected to the outside of the heat-insulating cold box (1) at equal intervals, a moving block (102) threadedly connected to the outside of the screw (101), a fixed plate (103) fixedly connected to the outside of the heat-insulating cold box (1) at equal intervals, a moving block (104) movably arranged on the fixed plate (103), a connecting rod (105) hinged between the moving block (104) and the moving block (102), a clamping block (106) fixedly mounted on the top of the moving block (104), and a clamping slot (107) provided on the cover (2) and the heat-insulating cold box (1).

3. A liquid hydrogen pump cold box insulation device according to claim 1, characterized in that: The sealing and heat-insulating assembly comprises an annular groove (201) opened on the top of the heat-insulating cold box (1), a first low-temperature rubber ring (202) fixedly installed inside the annular groove (201), a second low-temperature rubber ring (203) fixedly installed inside the annular groove (201), and an extrusion ring (204) fixedly installed at the bottom of the cover (2).

4. A liquid hydrogen pump cold box insulation device according to claim 1, characterized in that: The heat-insulating cold box (1) is divided into an outer box (1001) and an inner box (1002), and the liquid inlet pipe (3) and the air return pipe (5) are both fixedly connected to the inner box (1002).

5. A liquid hydrogen pump cold box insulation device according to claim 4, characterized in that: A cavity is provided between the outer box (1001) and the inner box (1002), and the interior of the cavity is filled with a heat-insulating layer.

6. A liquid hydrogen pump cold box insulation device according to claim 2, characterized in that: A guide rod (6) is fixedly mounted on one side of the screw rod (101), and the guide rod (6) is slidably connected to the moving block (102).

7. A liquid hydrogen pump cold box insulation device according to claim 2, characterized in that: A limiting sliding groove (7) is provided on the fixed plate (103), and the limiting sliding groove (7) is slidably connected to the movable block (104).

8. A liquid hydrogen pump cold box insulation device according to claim 2, characterized in that: The cover (2) and the heat-insulating cold box (1) are provided with a card slot (107) for installing the card block (106), both sides of the bottom of the cover (2) are fixedly connected with positioning columns (8), and the top of the heat-insulating cold box (1) is symmetrically provided with positioning slots for installing the positioning columns (8).

9. A liquid hydrogen pump cold box insulation device according to claim 2, characterized in that: The bottom of the screw rod (101) is fixedly connected to a transmission gear, and the outside of the transmission gear is transmission-connected via a transmission toothed belt (9).

10. A liquid hydrogen pump cold box insulation device according to claim 3, characterized in that: The diameter of the first low-temperature rubber ring (202) is smaller than the diameter of the second low-temperature rubber ring (203); a gap is left between the first low-temperature rubber ring (202) and the second low-temperature rubber ring (203); the length of the gap is smaller than the length of the extrusion ring (204); the upper parts of the opposing surfaces of the first low-temperature rubber ring (202) and the second low-temperature rubber ring (203) are both inclined inwards; and both sides of the bottom of the extrusion ring (204) are both inclined.

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