Heat insulation method of vacuum heat insulation cryogenic pressure vessel

Abstract

The invention discloses a heat insulation method of a vacuum heat insulation cryogenic pressure vessel, and relates to the technical field of pressure vessel heat insulation. An outer tank body is arranged on the outer side of an inner tank body in a sleeving mode, a cavity used for vacuumizing is formed between the inner tank body and the outer tank body, and pumping holes are evenly formed in the outer end wall of the outer tank body; by matching with vacuumizing operation in the cavity, negative pressure adsorption can be formed at the position of the drawing hole, the heat insulation sheet covering the outer side of the outer tank body is firmly attached, firm connection of the heat insulation sheet and the outer tank body is achieved, the heat insulation sheet is safe, environmentally friendly and convenient to pave, different types of heat insulation sheets can be flexibly detached and replaced according to actual use requirements to insulate heat of the pressure container, and the service life of the pressure container is prolonged. Public utilization of the pressure vessel is achieved, the use cost of the pressure vessel is reduced to a certain degree, double heat insulation is conducted through covering and wrapping of the composite heat insulation layer and vacuum in the cavity, and the heat insulation performance of the pressure vessel is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat insulation of pressure vessels, and in particular to a heat insulation method for a vacuum heat-insulated cryogenic pressure vessel. Background Art

[0002] A vacuum insulated cryogenic pressure vessel is a container that uses a refrigeration system to make the internal temperature reach an extremely low state. It is mainly used for the storage and transportation of liquid gases. During the use of a vacuum insulated cryogenic pressure vessel, its internal space is in a vacuum state. In order to ensure that the gas is in the required low temperature or high pressure state during storage or transportation, the outer surface of the pressure vessel needs to be covered with insulating material.

[0003] In the prior art, the insulating material is usually wrapped around the outside of the pressure vessel by gluing or sewing with a mesh. In the process of attaching the insulating material to the outside of the pressure vessel by gluing, the curing of the glue will make it difficult to remove the insulating material after it is attached, and it is impossible to flexibly replace the insulating material that meets the requirements according to the actual needs of the liquid and gas stored and transported, which makes the pressure vessel difficult to share and easily leads to a significant increase in the use cost of the pressure vessel. In addition, the glue coating and curing process will also cause harm to the workers and the environment. If the insulating material is wrapped around the outside of the pressure vessel by sewing with a mesh, although the replacement of the insulating material can be achieved to a certain extent, the sewing and connection operation of the insulating material is cumbersome, and in this way, the insulating material is difficult to fit tightly with the outer surface of the pressure vessel, which easily leads to the problem of reduced insulation performance.

[0004] Therefore, a method for insulating a vacuum insulated cryogenic pressure vessel is proposed to solve some problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the external insulation material of the vacuum insulated cryogenic pressure vessel is inconvenient to remove and replace, which makes the pressure vessel difficult to share and easily leads to a substantial increase in the cost of use, and to propose an insulation method for a vacuum insulated cryogenic pressure vessel.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions: A heat insulation method for a vacuum insulated cryogenic pressure vessel, comprising an inner tank body, an outer tank body being sleeved on the outer side of the inner tank body, and a plurality of evenly distributed extraction holes being opened on the outer end wall of the outer tank body, a extraction pipe being fixedly connected to the outer end wall of the outer tank body, and the extraction pipe being communicated with a cavity formed between the inner tank body and the outer tank body, a valve being fixedly installed in the extraction pipe, a plurality of evenly distributed heat insulation sheets being attached to the outer end wall of the outer tank body, and the heat insulation sheets comprising a composite heat insulation layer, and a sealing rubber pad being fixedly attached to the bottom of the composite heat insulation layer; The suction tube is connected to an external suction pump for vacuuming the cavity between the inner tank body and the outer tank body. External airflow enters the cavity through the suction hole, forming negative pressure adsorption at the suction hole. In this process, many insulation sheets are attached to the outer end wall of the outer tank body one by one. With the help of negative pressure adsorption, the sealing pad is tightly attached to the outer end wall of the outer tank body until all the suction holes are covered and sealed by the sealing pad in the insulation sheet, so that the insulation sheet completes the wrapping of the outer tank body. After the cavity is vacuumed, the valve is closed to keep the cavity in a vacuum state, thereby completing the stable connection between the insulation sheet and the outer tank body.

[0007] Preferably, a plurality of axially uniformly distributed first brackets are fixedly connected between the inner tank body and the outer tank body, a radially uniformly distributed second brackets are fixedly connected between the plurality of first brackets, and the second brackets are fixedly connected to the inner tank body and the outer tank body.

[0008] Preferably, the first bracket and the second bracket divide the cavity into a plurality of evenly distributed first chambers and two left and right second chambers. The first bracket is provided with through holes connecting two adjacent first chambers and between the first chamber and the second chamber, and the suction tube is fixedly connected to one of the through holes.

[0009] Preferably, a valve tube is fixedly installed in the through hole, and the valve tube is provided with a first air hole and a second air hole located on both sides of the first bracket, a valve core is slidably installed in the second air hole to seal between the first air hole and the second air hole, a storage cavity is provided on the side of the valve tube away from the first air hole and the second air hole, and a plurality of valve cores between two adjacent second brackets are connected in series with a pull rope.

[0010] Preferably, the valve tube is configured as a cylindrical structure, the first air hole and the second air hole are both opened on the cylindrical surface of the valve tube, the valve core is configured as a cylindrical structure, and the outer size of the valve core is adapted to the inner size of the valve tube.

[0011] Preferably, sealing cylinders extending into the corresponding second chamber are fixedly installed at both ends of the left and right ends of the outer tank body, and a slider is slidably installed in the sealing cylinder, the slider on the left is fixedly connected to the left ends of many pull ropes, and the slider on the right is fixedly connected to the right ends of many pull ropes, and a screw rod screwed to the slider thread is rotatably installed in the sealing cylinder.

[0012] Preferably, a transmission rod rotatably mounted in the inner tank body is fixedly connected between the left and right screws, a gear housing is fixedly mounted on one of the sealing cylinders, a worm wheel rotatably mounted in the gear housing and connected to the screw, a worm meshing with the worm wheel is rotatably mounted in the gear housing, and a crank rotatably mounted on the outside of the gear housing is fixed at the end of the worm.

[0013] Preferably, a round tube wrapped around the outside of the transmission rod is fixedly installed at the axial position in the inner tank body, and a plurality of support plates fixedly connected to the inner end wall of the inner tank body are fixedly installed on the round tube, and the support plates are provided with evenly distributed through grooves, and a large number of circumferentially distributed triangular welding corners are fixedly installed between the inner tank body and the support plates, and between the round tube and the support plates.

[0014] Preferably, an electromagnet is fixedly installed in each first chamber, and a thin iron sheet is fixedly installed between the composite insulation layer and the sealing rubber gasket.

[0015] Preferably, mutually adapted stacking structures are arranged at symmetrical edge positions on both sides of the composite thermal insulation layer, and during the paving process, the stacking structures close to each other in two adjacent thermal insulation sheets are staggered and overlapped.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the outer tank body is sleeved on the outer side of the inner tank body, a cavity for vacuuming is formed between the inner tank body and the outer tank body, and the vacuuming holes are evenly opened on the outer end wall of the outer tank body, and the vacuuming operation in the cavity is coordinated, so that negative pressure adsorption can be formed at the vacuuming holes, and the heat insulation sheet covering the outer side of the outer tank body is firmly attached to achieve a firm connection between the heat insulation sheet and the outer tank body, so that the heat insulation sheet does not need to be glued or meshed during the paving process, which is safe, environmentally friendly, and convenient to lay. Different types of heat insulation sheets can be flexibly replaced according to actual use requirements to insulate the pressure vessel, so as to realize the sharing of pressure vessels, which is conducive to significantly reducing the number of pressure vessels wrapped with different insulation materials, and to a certain extent reducing the use cost of the pressure vessels. At the same time, double insulation is performed by covering and wrapping with the composite insulation layer and the vacuum in the cavity, which is conducive to improving the insulation performance of the pressure vessel; 2. In the present invention, the cavity between the inner tank body and the outer tank body is divided into a plurality of evenly distributed first chambers by a plurality of first brackets and second brackets, and the connection and cutoff between the first air hole and the second air hole are controlled by the valve core sliding in the valve tube, so that a single first chamber can constitute a relatively independent vacuum area. After the first chamber exits the vacuum state due to damage and leakage of the inner tank body, the corresponding external heat insulation sheet loses negative pressure adsorption and falls off, so that the staff can determine whether the inner tank body is damaged and leaking according to the shedding of the heat insulation sheet, and quickly locate the damaged and leaking position according to the falling position of the heat insulation sheet, which is conducive to ensuring the operation stability of the pressure vessel; 3. In the present invention, the control of the connection / cutoff of the first air hole and the second air hole is realized by sliding the valve core, and the first air hole and the second air hole are opened on the cylindrical surface of the valve tube, so that the air intake direction of the first air hole and the second air hole is perpendicular to the cylindrical surface of the valve core and perpendicular to the sliding direction of the valve core. When the interior of one of the first chambers exits the vacuum state, the thrust formed by the pressure difference between the two adjacent first chambers acts vertically on the cylindrical surface of the valve core, and no axial thrust is applied to the valve core. With the connection restriction of the pull rope, the stability of the valve core blocking between the first air hole and the second air hole can be guaranteed, which is conducive to ensuring the independent stability between the two adjacent first chambers, and further conducive to ensuring the accuracy of the staff to quickly locate the damaged leakage position of the inner tank body according to the falling position of the heat insulation sheet; 4. In the present invention, by fixing the electromagnet in the first chamber, the electromagnet can magnetically adsorb the thin iron sheet in the thermal insulation sheet, so that the paving position of the thermal insulation sheet can be pre-fixed during the paving process, and the thermal insulation sheet under magnetic attraction can be adjusted, which is beneficial to ensure the convenience of adjustment during the paving of the thermal insulation sheet. At the same time, by setting the stacking structure at the symmetrical edge positions on both sides of the composite insulation layer, when two adjacent thermal insulation sheets are laid, the stacking structures close to each other on the two adjacent composite insulation layers are staggered and overlapped, which is beneficial to improve the tight connection between the composite insulation layers in the two adjacent thermal insulation sheets, and to a certain extent improve the thermal insulation performance of the adjacent thermal insulation sheets after splicing and paving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a three-dimensional diagram of the outer tank body of the present invention after being wrapped with a heat insulation sheet; Figure 2 This is a three-dimensional diagram of the outer tank body of the present invention when the outer portion is not wrapped with a heat insulation sheet; Figure 3 It is a three-dimensional diagram of the structure between the inner tank body and the outer tank body of the present invention; Figure 4 A three-dimensional diagram of the pull rope, slider and screw rod of the present invention; Figure 5 A three-dimensional diagram of a circular tube and a support plate of the present invention; Figure 6 is a three-dimensional diagram of the heat insulation sheet of the present invention; Figure 7 A three-dimensional diagram of a plurality of heat-insulating sheets of the present invention when assembled together; Figure 8 For the present invention Figure 7 Front view of the middle structure; Fig. 9 For the present invention Figure 1 A top view of the structure in the middle; Fig.10 For the present invention Fig. 9 Sectional view at AA in the middle; Fig.11 For the present invention Fig.10 The enlarged view of point D in the middle; Fig.12 For the present invention Fig. 9 Sectional view at the middle BB; Fig.13 For the present invention Fig. 9 Sectional view at CC; Fig.14 For the present invention Figure 1 Top view of the structure.

[0018] Serial number in the picture: 1. Inner tank body; 101. Outer tank body; 102. First bracket; 103. Second bracket; 104. First chamber; 105. Second chamber; 106. Pumping hole; 107. Through hole; 108. Pumping tube; 109. Valve; 2. Valve tube; 201. First air hole; 202. Second air hole; 203. Valve core; 204. Storage chamber; 205. Pull rope; 206. Sealing cylinder; 207. Sliding block; 208. Screw; 3. Transmission rod; 301. Gear housing; 302. Worm wheel; 303. Worm; 304. Crank handle; 4. round tube; 401. support plate; 402. through slot; 403. triangular welding angle; 5. Electromagnet; 6. thermal insulation sheet; 601. composite thermal insulation layer; 602. sealing rubber pad; 603. thin iron sheet; 604. laminated structure. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment: This embodiment provides a method for insulating a vacuum insulated cryogenic pressure vessel, see Figure 1 - Fig.14Specifically, it includes an inner tank body 1, an outer tank body 101 is sleeved on the outer side of the inner tank body 1, and a plurality of evenly distributed extraction holes 106 are opened on the outer end wall of the outer tank body 101, a extraction pipe 108 is fixedly connected to the outer end wall of the outer tank body 101, and the extraction pipe 108 is communicated with the cavity formed between the inner tank body 1 and the outer tank body 101, a valve 109 is fixedly installed in the extraction pipe 108, a plurality of evenly distributed heat insulation sheets 6 are attached to the outer end wall of the outer tank body 101, and the heat insulation sheet 6 includes a composite heat insulation layer 601, and a sealing rubber pad 602 is fixedly attached to the bottom of the composite heat insulation layer 601; The suction pipe 108 is externally connected to a suction pump, which is used to evacuate the cavity between the inner tank body 1 and the outer tank body 101. The external airflow enters the cavity through the suction hole 106, and negative pressure adsorption is formed at the suction hole 106. In this process, many insulation sheets 6 are attached to the outer end wall of the outer tank body 101 one by one. With the help of negative pressure adsorption, the sealing gasket 602 is tightly attached to the outer end wall of the outer tank body 101 until all the suction holes 106 are covered and sealed by the sealing gasket 602 in the insulation sheet 6, so that the insulation sheet 6 completes the wrapping of the outer tank body 101. After the cavity is evacuated, the valve 109 is closed to keep the cavity in a vacuum state, thereby completing the stable connection between the insulation sheet 6 and the outer tank body 101.

[0021] When the pressure vessel is in use, the inner tank body 1 is used to store liquid gas. A connecting pipe connected to the outside of the outer tank body 101 is fixed on the inner tank body 1. The liquid gas in the inner tank body 1 can be introduced and discharged through the connecting pipe. By sleeve-arranging the outer tank body 101 on the outside of the inner tank body 1, a cavity can be formed between the inner tank body 1 and the outer tank body 101. By evenly opening the pumping holes 106 on the outer end wall of the outer tank body 101 and connecting with the cavity, a negative pressure adsorption force can be formed at the pumping holes 106 when the cavity is vacuumed. The external airflow is maintained through the pumping holes 106. It continuously enters the cavity and is finally pumped out by an external pump. The thermal insulation sheet 6 presents a small square structure. The staff gradually lays the thermal insulation sheet 6 on the outer surface of the outer tank body 101, so that the outer end wall of the outer tank body 101 is fully wrapped by a large number of thermal insulation sheets 6. When the thermal insulation sheet 6 is laid on the outer end wall of the outer tank body 101, the sealing pad 602 in the thermal insulation sheet 6 contacts the outer surface of the outer tank body 101. At this time, with the help of the negative pressure adsorption generated by the airflow suction at the pumping hole 106, the sealing pad 602 can be firmly attached to the outer surface of the outer tank body 101.

[0022] When the plurality of heat-insulating sheets 6 are completely wrapped around the outside of the outer tank body 101, all the pumping holes 106 evenly opened on the outer end wall of the outer tank body 101 will be covered and sealed, so that the cavity between the inner tank body 1 and the outer tank body 101 is in a relatively independent state. At this time, the external airflow cannot enter the cavity through the pumping holes 106. With the continuous suction of the pump, the cavity gradually tends to a vacuum state. When the cavity is vacuumed, the staff first closes the valve 109, and then immediately shuts down the pump and disconnects the pump pipe 108 from the pump, so that an independent vacuum environment is formed in the cavity. Since the air pressure in the cavity is extremely low, almost close to a vacuum, and there is a huge pressure difference with the standard atmospheric pressure in the external environment, the sealing rubber pad 602 can be tightly adsorbed on the pumping hole 106, thereby ensuring that the heat-insulating sheet 6 is firmly attached to the outer end wall of the inner tank body 1.

[0023] The method is used to complete the installation and connection of the heat insulation sheet 6 and the outer tank body 101. The heat insulation sheet 6 on the outside is wrapped around the outside of the outer tank body 101. The composite insulation layer 601 inside the heat insulation sheet 6 is made of a multi-layer composite insulation material, which can provide good heat insulation performance. At the same time, the cavity between the inner tank body 1 and the outer tank body 101 forms a vacuum state due to vacuum pumping, which can also improve the heat insulation performance of the inner tank body 1. The double structures cooperate with each other to effectively improve the heat insulation performance of the pressure vessel, and with the help of the negative pressure suction during the vacuum pumping process in the cavity between the inner tank body 1 and the outer tank body 101 Attached, the thermal insulation sheet 6 is firmly adsorbed on the outer end wall of the outer tank body 101, so that there is no need to use glue to stick the thermal insulation sheet 6 during the installation process, and there is no need to use other external accessories to wrap and fix it, which can effectively improve the firmness and convenience of laying the thermal insulation sheet 6 on the outside of the outer tank body 101, is safe and environmentally friendly, and can efficiently and conveniently replace different types of thermal insulation sheets 6 to insulate the pressure vessel according to actual use needs, thereby realizing the commonality of pressure vessels, which is conducive to significantly reducing the number of pressure vessels wrapped with different insulation materials, and reducing the use cost of pressure vessels to a certain extent.

[0024] In the specific implementation process, Figure 3 and Figure 4As shown, a plurality of axially uniformly distributed first brackets 102 are fixedly connected between the inner tank body 1 and the outer tank body 101, a radially uniformly distributed second bracket 103 is fixedly connected between the plurality of first brackets 102, and the second bracket 103 is fixedly connected to the inner tank body 1 and the outer tank body 101. When the pressure vessel is in use, the axially uniformly distributed first brackets 102 are fixedly installed between the inner tank body 1 and the outer tank body 101, and the radially uniformly distributed second brackets 103 are fixedly installed between the inner tank body 1 and the outer tank body 101, so that a grid-shaped support structure is formed between the inner tank body 1 and the outer tank body 101. With the support of the first brackets 102 and the second brackets 103, the structural firmness and stability between the inner tank body 1 and the outer tank body 101 can be effectively improved, and the inner tank body 1 and the outer tank body 101 are prevented from being sunken due to vacuum in the cavity, thereby improving the stability of the pressure vessel during actual use to a certain extent.

[0025] In the specific implementation process, Figure 3 , Fig.10 - Fig.11 and Fig.14 As shown, the first bracket 102 and the second bracket 103 divide the cavity into a plurality of evenly distributed first chambers 104 and two left and right second chambers 105. The first bracket 102 is provided with through holes 107 connecting two adjacent first chambers 104 and between the first chamber 104 and the second chamber 105. The suction pipe 108 is fixedly connected to one of the through holes 107. A valve pipe 2 is fixedly installed in the through hole 107. The valve pipe 2 is provided with first air holes 201 and second air holes 202 located on both sides of the first bracket 102. The second air holes 201 and 202 are provided on the valve pipe 2. A valve core 203 is slidably installed in 202 to seal between the first air hole 201 and the second air hole 202. A storage cavity 204 is provided on the side of the valve tube 2 away from the first air hole 201 and the second air hole 202. The multiple valve cores 203 between two adjacent second brackets 103 are connected in series with a pull rope 205. The valve tube 2 is configured as a cylindrical structure. The first air hole 201 and the second air hole 202 are both opened on the cylindrical surface of the valve tube 2. The valve core 203 is configured as a cylindrical structure. The outer size of the valve core 203 is adapted to the inner size of the valve tube 2.

[0026] When the pressure vessel is in use, the first bracket 102 and the second bracket 103 are tightly welded to the outer end wall of the inner tank body 1 and the inner end wall of the outer tank body 101, so that the inner tank body 1 and the outer tank body 101 cooperate with the first bracket 102 and the second bracket 103 to form a plurality of evenly distributed first chambers 104 and second chambers 105 at the left and right ends. When it is necessary to evacuate the cavity, the staff pulls the pull rope 205 to adjust the position of the valve core 203. Driven synchronously by the plurality of pull ropes 205, all the valve cores 203 move together, and the valve core 203 slides into the storage chamber 204, and no longer blocks the first air hole 201 and the second air hole 202. At this time, the plurality of first chambers 104 are interconnected through the first air hole 201, the inside of the valve tube 2 and the second air hole 202, and the first chamber 104 and the second chamber 105 are connected. The first air hole 201, the inside of the valve tube 2 and the second air hole 202 are also interconnected. In this case, many first chambers 104 and second chambers 105 are interconnected. When the staff performs vacuum operation through the suction tube 108, it can ensure that the cavity between the inner tank body 1 and the outer tank body 101 is stably vacuumed. When the vacuuming is completed, the staff controls the pull rope 205 to drive all the valve cores 203 to move in the opposite direction and reset synchronously, so that the valve core 203 moves back between the first air hole 201 and the second air hole 202, and the first air hole 201 and the second air hole 202 are blocked. In this state, many first chambers 104 and second chambers 105 are no longer connected to each other, and the first chamber 104 and the second chamber 105 constitute relatively independent small cavities, and these small cavities are all in a relatively independent vacuum state.

[0027] When the area on the end wall of the inner tank body 1 corresponding to one of the first chambers 104 is damaged and leaks, the liquid gas in the inner tank body 1 leaks into the corresponding first chamber 104 through the damaged position. At this time, the first chamber 104 is no longer in a vacuum state due to the entry of the leaked substance, and it is impossible to generate negative pressure adsorption on the insulation sheet 6 covering the corresponding position, causing the insulation sheet 6 corresponding to the outside of the first chamber 104 to automatically fall off. The outer end wall of the outer tank body 101 is painted with eye-catching yellow paint, and the outer color of the composite insulation layer 601 on the insulation sheet 6 is the same as that of the outer tank body 101. The color of the outer end wall has a striking difference, so that when the inner tank body 1 leaks due to damage to the end wall, the staff can intuitively observe the falling off of the insulation sheet 6 at the corresponding position, and then the staff can determine whether the pressure vessel is operating stably by observing the fitting state of the insulation sheet 6, so as to facilitate timely response and processing when leakage occurs. When this method is used to complete the insulation operation of the pressure vessel, it can not only effectively improve the insulation effect of the pressure vessel, but also assist the staff to monitor the operating status of the pressure vessel, which is beneficial to ensure the operating stability of the pressure vessel.

[0028] The device controls the connection / cutoff of the first air hole 201 and the second air hole 202 by sliding the valve core 203, and the first air hole 201 and the second air hole 202 are opened on the cylindrical surface of the valve tube 2, so that the air intake direction of the first air hole 201 and the second air hole 202 is perpendicular to the cylindrical surface of the valve core 203 and perpendicular to the sliding direction of the valve core 203. This structural arrangement enables, when the vacuum state is exited inside one of the first chambers 104, the thrust formed by the pressure difference between the two adjacent first chambers 104 acts perpendicularly on the cylindrical surface of the valve core 203, and no axial thrust is applied to the valve core 203. Combined with the connection restriction of the pull rope 205, the stability of the valve core 203 blocking between the first air hole 201 and the second air hole 202 can be ensured, which is conducive to ensuring the independent stability between the two adjacent first chambers 104.

[0029] In the specific implementation process, Figure 4 , Fig.10 and Fig.13 - Fig.14 As shown, a sealing cylinder 206 extending into the corresponding second chamber 105 is fixedly installed at both left and right ends of the outer tank body 101, and a slider 207 is slidably installed in the sealing cylinder 206, the slider 207 on the left is fixedly connected to the left ends of many pull ropes 205, and the slider 207 on the right is fixedly connected to the right ends of many pull ropes 205, a screw 208 threadedly screwed to the slider 207 is rotatably installed in the sealing cylinder 206, a transmission rod 3 rotatably installed in the inner tank body 1 is fixedly connected between the left and right screws 208, a gear housing 301 is fixedly installed on one of the sealing cylinders 206, and a worm wheel 302 drivingly connected to the screw wheel 208 is rotatably installed in the gear housing 301, a worm 303 meshing with the worm wheel 302 is rotatably installed in the gear housing 301, and a crank 304 rotatably installed on the outside of the gear housing 301 is fixed at the end of the worm 303.

[0030] When the pressure vessel is in use, the screw 208 and the gear housing 301, and the transmission rod 3 and the inner tank body 1 are sealed and rotatably connected. The internal seal of the inner tank body 1 will not be affected by the rotation of the transmission rod 3, and the seal of the cavity between the inner tank body 1 and the outer tank body 101 will not be affected by the rotation of the screw 208. When the staff needs to control the movement of the valve core 203 in the valve tube 2, they can hold the crank 304 to rotate, drive the worm 303 to rotate synchronously, and then drive the screw 208 connected to the worm wheel 302 to rotate with the help of the meshing transmission of the worm 303 and the worm wheel 302. Under the transmission connection of the transmission rod 3, the screws 208 on the left and right sides rotate synchronously. During the rotation process, with the help of the screw 208 and the slider 207, The threaded engagement drives the slider 207 to move along the screw 208 in the sealing cylinder 206, and the sliders 207 on the left and right sides move synchronously to the left or to the right. When the slider 207 moves to the left, all the valve cores 203 are driven to move synchronously to the left through the connection of the pull rope 205. Similarly, when the slider 207 moves to the right, all the valve cores 203 are driven to move synchronously to the right through the connection of the pull rope 205, thereby realizing the control of the connection / cutoff of the first air hole 201 and the second air hole 202. This mode is easy to operate, and with the help of the locking of the threaded engagement between the slider 207 and the screw 208, and the self-locking of the tooth engagement between the worm wheel 302 and the worm 303, it is beneficial to ensure the stability of the valve core 203 after the position is adjusted.

[0031] In the specific implementation process, Figure 5 , Fig.10 , Fig.12 and Fig.14 As shown, a round tube 4 wrapped around the outside of the transmission rod 3 is fixedly installed at the inner axis position of the inner tank body 1, and a plurality of support plates 401 fixedly connected to the inner end wall of the inner tank body 1 are fixedly installed on the round tube 4, and evenly distributed through grooves 402 are opened on the support plate 401. A plurality of surrounding triangular welding angles 403 are fixedly installed between the inner tank body 1 and the support plate 401, and between the round tube 4 and the support plate 401. When the pressure vessel is in use, the transmission rod 3 can be isolated from the inside of the inner tank body 1 by wrapping the round tube 4 around the outside of the transmission rod 3, so as to prevent the rotation of the transmission rod 3 from affecting the independent sealing inside the inner tank body 1. At the same time, the circular tube 4 and the support plate 401 cooperate with each other to form a reinforced connection structure inside the inner tank body 1, and the welding reinforcement of the triangular welding angle 403 between the circular tube 4 and the support plate 401, and between the support plate 401 and the inner end wall of the inner tank body 1 can effectively improve the stability of the internal structure of the inner tank body 1, which is beneficial to improve the pressure-bearing capacity of the inner tank body 1 to a certain extent. The through groove 402 is opened on the support plate 401, so that the interior of the inner tank body 1 is still in an independent space with smooth flow after welding reinforcement, thereby ensuring the smooth and stable entry of materials into the inner tank body 1 or the discharge of materials from the inner tank body 1.

[0032] In the specific implementation process, Figure 3 and Figure 6 - Figure 8 As shown, an electromagnet 5 is fixedly installed in each first chamber 104, a thin iron sheet 603 is fixedly installed between the composite insulation layer 601 and the sealing rubber pad 602, and mutually adapted stacking structures 604 are symmetrically arranged at the edge positions on both sides of the composite insulation layer 601. During the paving process, the stacking structures 604 close to each other in two adjacent insulation sheets 6 are staggered and overlapped. When the pressure vessel is in use, in the process of paving the insulation sheet 6 on the outer end wall of the outer tank body 101, the staff can start the vacuum operation in the cavity without starting the pump, and can first power on the electromagnet 5 fixed in each first chamber 104. After the electromagnet 5 is powered on, it will generate magnetic adsorption on the outer side of the outer tank body 101, and the thin iron sheet 603 will be attracted by the magnetic force. The characteristics enable the heat insulation sheet 6 to be attached to the outer end wall of the outer tank body 101. The magnetic adsorption force generated by the electromagnet 5 is moderate, which can ensure that the heat insulation sheet 6 will not fall off after being attached to the outer end wall of the outer tank body 101, and can be moved by adjustment, which is conducive to improving the convenience of adjustment for the staff to lay the heat insulation sheet 6 on the outside of the outer tank body 101 in sequence. When the heat insulation sheet 6 is laid, the staff starts the pump to vacuum the cavity, and uses the negative pressure adsorption at the pumping hole 106 to complete the firm connection of the heat insulation sheet 6. With the completion of vacuuming, the heat insulation sheet 6 is firmly connected, and the staff can turn off the electromagnet 5. During the laying of the heat insulation sheet 6, the electromagnet 5 can be gradually turned on according to the laying position of the staff, and the operation is more flexible.

[0033] When two adjacent thermal insulation sheets 6 are laid, the stacked structures 604 close to each other on the composite insulation layers 601 in the two adjacent thermal insulation sheets 6 are staggered and overlapped, which makes the composite insulation layers 601 in the two adjacent thermal insulation sheets 6 tightly connected, and no straight up and down gaps are formed due to the splicing of the thermal insulation sheets 6, which is beneficial to ensuring the thermal insulation performance of the adjacent thermal insulation sheets 6 after splicing and laying.

[0034] Specifically, the working principle and operation method of the present invention are as follows: The staff energizes and starts the electromagnet 5. With the help of the magnetic attraction of the electromagnet 5 to the thin iron sheet 603, the many heat-insulating sheets 6 are orderly laid on the outer end wall of the outer tank body 101 to complete the heat-insulating wrapping thereof, and the sealing rubber pad 602 will fully cover the evenly opened suction holes 106 on the outer end wall of the outer tank body 101. Then the staff holds the crank 304 and rotates it. With the help of the meshing of the worm 303 and the worm wheel 302, and the transmission connection of the transmission rod 3, the left and right side screws 208 are driven to rotate synchronously. With the help of the threaded meshing of the screw 208 and the slider 207, the left and right sliders 207 are driven to move synchronously in the same direction. Under the connection of many pull ropes 205, the valve core 203 is controlled to move in the valve tube 2, and the valve core 203 is moved into the storage chamber 204, so that the first air hole 201 and the second air hole 202 are connected. Then the staff connects the suction pump to the suction tube 108 and opens the valve 109 to pump the first air holes 201 and the second air holes 202. The first chamber 104 and the second chamber 105 are evacuated, and negative pressure adsorption is formed at the suction hole 106 through air flow, so that the sealing rubber pad 602 is tightly fitted with the outer end wall of the outer tank body 101, and the first chamber 104 and the second chamber 105 formed by separating the cavity are evacuated, and the valve 109 is closed, and the connection between the suction tube 108 and the suction pump is disconnected, and then the crank 304 is rotated in the opposite direction to control the valve core 203 to move back between the first air hole 201 and the second air hole 202 to cut off the connection between them, so that many first chambers 104 form independent vacuum small cavities, and the electromagnet 5 is turned off. With the help of negative pressure adsorption, the insulation sheet 6 is firmly installed, and the composite insulation layer 601 and the vacuum in the cavity are used for insulation to improve the insulation performance of the pressure vessel. In actual use, the staff can determine whether the inner tank body 1 is damaged or leaking by observing the shedding of the insulation sheet 6, and quickly locate the damaged and leaking position.

[0035] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for insulating a vacuum insulated cryogenic pressure vessel, comprising an inner tank body (1), characterized in that: The outer side of the inner tank body (1) is sleeved with an outer tank body (101), and a plurality of evenly distributed extraction holes (106) are opened on the outer end wall of the outer tank body (101), a extraction pipe (108) is fixedly connected to the outer end wall of the outer tank body (101), and the extraction pipe (108) is communicated with the cavity formed between the inner tank body (1) and the outer tank body (101), a valve (109) is fixedly installed in the extraction pipe (108), and a plurality of evenly distributed heat insulation sheets (6) are attached to the outer end wall of the outer tank body (101), and the heat insulation sheets (6) include a composite heat insulation layer (601), and a sealing rubber pad (602) is fixedly attached to the bottom of the composite heat insulation layer (601); The suction pipe (108) is externally connected to a suction pump and is used to perform a vacuum operation on the cavity between the inner tank body (1) and the outer tank body (101). External airflow enters the cavity through the suction hole (106), and negative pressure adsorption is formed at the suction hole (106). During this process, a plurality of heat insulation sheets (6) are attached to the outer end wall of the outer tank body (101) one by one. With the help of negative pressure adsorption, the sealing rubber pad (602) is tightly attached to the outer end wall of the outer tank body (101) until all the suction holes (106) are covered and sealed by the sealing rubber pad (602) in the heat insulation sheet (6), so that the heat insulation sheet (6) completes the wrapping of the outer tank body (101). After the cavity is vacuumed, the valve (109) is closed to keep the cavity in a vacuum state, thereby completing a stable connection between the heat insulation sheet (6) and the outer tank body (101).

2. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 1, characterized in that: A plurality of axially evenly distributed first brackets (102) are fixedly connected between the inner tank body (1) and the outer tank body (101), a radially evenly distributed second brackets (103) are fixedly connected between the plurality of first brackets (102), and the second brackets (103) are fixedly connected to the inner tank body (1) and the outer tank body (101).

3. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 2, characterized in that: The first bracket (102) and the second bracket (103) divide the cavity into a plurality of evenly distributed first chambers (104) and two left and right second chambers (105); the first bracket (102) is provided with a through hole (107) connecting two adjacent first chambers (104) and between the first chamber (104) and the second chamber (105); the suction tube (108) is fixedly connected to one of the through holes (107).

4. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 3, characterized in that: A valve tube (2) is fixedly installed in the through hole (107), and the valve tube (2) is provided with a first air hole (201) and a second air hole (202) located on both sides of the first bracket (102); a valve core (203) is slidably installed in the second air hole (202) to block between the first air hole (201) and the second air hole (202); a storage cavity (204) is provided on one side of the valve tube (2) away from the first air hole (201) and the second air hole (202); and a plurality of valve cores (203) located between two adjacent second brackets (103) are connected in series with a pull rope (205).

5. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 4, characterized in that: The valve tube (2) is configured as a cylindrical structure, the first air hole (201) and the second air hole (202) are both provided on the cylindrical surface of the valve tube (2), the valve core (203) is configured as a cylindrical structure, and the outer dimensions of the valve core (203) are adapted to the inner dimensions of the valve tube (2).

6. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 5, characterized in that: A sealing cylinder (206) extending into the corresponding second chamber (105) is fixedly installed at both left and right ends of the outer tank body (101), and a slider (207) is slidably installed in the sealing cylinder (206). The slider (207) on the left is fixedly connected to the left ends of a plurality of pull ropes (205), and the slider (207) on the right is fixedly connected to the right ends of a plurality of pull ropes (205). A screw (208) threadedly connected to the slider (207) is rotatably installed in the sealing cylinder (206).

7. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 6, characterized in that: A transmission rod (3) rotatably mounted in the inner tank body (1) is fixedly connected between the left and right screw rods (208), a gear housing (301) is fixedly mounted on one of the sealing cylinders (206), a worm wheel (302) rotatably mounted in the gear housing (301) and connected to the screw rod (208), a worm (303) meshing with the worm wheel (302) is rotatably mounted in the gear housing (301), and a crank (304) rotatably mounted on the outside of the gear housing (301) is fixed at the end of the worm (303).

8. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 7, characterized in that: A round tube (4) wrapped around the outside of the transmission rod (3) is fixedly mounted at the inner axis position of the inner tank body (1), and a plurality of support plates (401) fixedly connected to the inner end wall of the inner tank body (1) are fixedly mounted on the round tube (4), and evenly distributed through grooves (402) are formed on the support plate (401), and a plurality of circumferentially distributed triangular welding angles (403) are fixedly mounted between the inner tank body (1) and the support plate (401), and between the round tube (4) and the support plate (401).

9. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 3, characterized in that: An electromagnet (5) is fixedly installed in each of the first chambers (104), and a thin iron sheet (603) is fixedly installed between the composite heat insulation layer (601) and the sealing rubber pad (602).

10. The insulation method of a vacuum insulated cryogenic pressure vessel according to claim 1, characterized in that: Mutually adapted stacking structures (604) are provided at symmetrical edge positions on both sides of the composite thermal insulation layer (601). During the paving process, the stacking structures (604) close to each other in two adjacent thermal insulation sheets (6) are staggered and overlapped.

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