Electrical feedthrough device, hoisting device, submersible pump system and cryogenic storage tank

Abstract

The present invention provides an electrical feedthrough device, a hoisting device, a submersible pump system and a cryogenic storage tank. Among them, an air inlet is provided on the feedthrough body of the electrical feedthrough device, and nitrogen enters the isolation chamber of the feedthrough body through the air inlet to form a nitrogen gas seal isolation between the first channel of the first feedthrough body and the second channel of the second feedthrough body, so as to prevent the media on both sides of the electrical feedthrough device from coming into contact with the atmosphere. At the same time, a gas channel is provided on the hoisting flange of the hoisting device, and nitrogen enters the installation space between the hoisting flange and the support rod through the gas channel to form a nitrogen gas seal isolation between the hoisting flange and the support rod, so as to prevent the media on both sides of the hoisting device from coming into contact with the atmosphere, thereby effectively preventing the media inside the tank from leaking at the hoisting device and the electrical feedthrough device, avoiding safety accidents caused by the contact between the media and the atmosphere, and improving the overall safety of the cryogenic storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic medium storage containers, and in particular to an electrical feed-through device, a hoisting device, a submersible pump system and a cryogenic storage tank. Background Art

[0002] Storage tanks used to store cryogenic media such as liquefied natural gas or liquid ethylene are increasingly used. Their structures are relatively complex and there is a risk of leakage during operation. The main dangerous leakage points of the pump well are the pump well electrical feedthrough device and the submersible pump hoisting mechanism outside the tank top cover.

[0003] When the cryogenic storage tank is discharging liquid, the submersible pump in the pump well is powered on and running. The electrical feedthrough device ensures the stability and safety of high-voltage electricity and effectively performs electrical isolation. However, when the seal in the electrical feedthrough device fails, the medium in the pump well will leak through the threading pipe, causing a safety accident. The submersible pump hoisting mechanism is used to lift the submersible pump. The vibration generated during the operation of the submersible pump loosens the bolts in the hoisting mechanism, causing the seal in the hoisting mechanism to fail, and the medium in the pump well cannot be blocked, resulting in a safety accident. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem in the prior art that medium leakage in the pump well of a low-temperature storage tank leads to safety accidents.

[0005] In order to solve the above technical problems, the present invention provides an electrical feedthrough device, including a feedthrough body, a feedthrough wire, and a sealing assembly; the feedthrough body includes a first feedthrough body and a second feedthrough body connected to each other, and an isolation cavity is formed between the first feedthrough body and the second feedthrough body; the first feedthrough body has a through first channel, and the second feedthrough body has a through second channel, and the first channel and the second channel are opposite to each other and are both connected to the isolation cavity; an air inlet connected to the isolation cavity is opened on the feedthrough body, and the air inlet is used to introduce nitrogen to form a nitrogen gas-tight isolation between the first channel and the second channel; the feedthrough wire is passed through the first channel, the isolation cavity and the second channel; one end of the feedthrough wire is used to be connected to a submersible pump, and the other end of the feedthrough wire is used to be connected to a power supply; the sealing assembly includes a first sealing sheet and a second sealing sheet arranged in a ring outside the feedthrough wire, the first sealing sheet is arranged between the inner wall of the first feedthrough body and the outer wall of the feedthrough wire, and the second sealing sheet is arranged between the inner wall of the second feedthrough body and the outer wall of the feedthrough wire.

[0006] Optionally, a groove is provided on a side of the first feedthrough body facing the second feedthrough body, the groove is connected to the first channel, the first feedthrough body is connected to the second feedthrough body, and the groove constitutes the isolation cavity; the air inlet is opened on the side wall of the groove of the first feedthrough body.

[0007] Optionally, a gas outlet is further provided on the feed-through body, and the gas outlet is communicated with the isolation cavity; when nitrogen is introduced into the gas inlet, the gas outlet is in a blocked state.

[0008] Optionally, the electrical feed-through device further comprises a quick-connect connector, which is disposed at the air inlet and is used to communicate with a nitrogen supply pipeline.

[0009] Optionally, the electrical feedthrough device further includes a first flange and a second flange, the first flange being arranged on a side of the first feedthrough body away from the second feedthrough body, and the second flange being arranged on a side of the second feedthrough body away from the first feedthrough body; the first flange and the second flange are connected to each other so that the first feedthrough body and the second feedthrough body are butt-connected; the feedthrough wire is passed through the interior of the first flange and the second flange.

[0010] Optionally, the sealing assembly also includes a first sealing ring, a second sealing ring and a third sealing ring; the first sealing ring is arranged between the first feedthrough body and the second feedthrough body, and is arranged around the periphery of the isolation cavity; the second sealing ring is arranged between the first feedthrough body and the first flange, and is arranged around the periphery of the first channel; the third sealing ring is arranged between the second feedthrough body and the second flange, and is arranged around the periphery of the second channel.

[0011] The present invention also provides a lifting device, including a lifting flange and a lifting assembly, the lifting flange is used to be arranged on a pump well, and the interior of the lifting flange is connected to the interior of the pump well; the lifting assembly includes a lifting piece and a supporting rod connected to the lifting piece, the supporting rod is penetrated through the lifting flange and the pump well, and the end of the supporting rod away from the lifting piece is used to be connected to a submersible pump inside the pump well, so that the submersible pump can rise or fall under the action of the lifting piece; wherein an installation space is formed between the inner wall of the lifting flange and the supporting rod, and the installation space is filled with sealing filler, and the sealing filler is arranged on the outer periphery of the supporting rod and attached to the inner wall of the lifting flange; a gas channel connected to the installation space is opened on the lifting flange, and the gas channel is used to pass nitrogen to form a nitrogen gas-tight isolation between the lifting flange and the supporting rod.

[0012] Optionally, the lifting flange includes a flange body and a boss portion, the interior of the flange body is hollow; the boss portion is annular and protrudes from the inner wall of the flange body, the support rod is passed through the interior of the boss portion, the installation space is formed between the inner wall of the flange body and the support rod, and the bottom end of the sealing filler abuts against the boss portion.

[0013] Optionally, the lifting flange further includes a top cover, which includes a cover body and a connecting portion. The interior of the cover body is hollow. The connecting portion protrudes from the outer periphery of the top of the cover body and is connected to the top of the flange body so that the top cover is fixed to the top of the lifting flange. The support rod passes through the interior of the cover body, and the bottom end of the cover body abuts against the top end of the sealing filler.

[0014] Optionally, the lifting device further includes a protective cover, which is fixed to the top of the lifting flange, and the lifting member is located inside the protective cover.

[0015] The present invention also provides a submersible pump system, including a pump well, a submersible pump, an electrical feedthrough device, and a lifting device. The pump well is used to be connected in a tank, and the top of the pump well extends out of the tank. The submersible pump is arranged in the pump well and is disposed at the bottom of the pump well. The electrical feedthrough device is arranged at the top of the pump well. One end of the feedthrough wire of the electrical feedthrough device is connected to the submersible pump through the interior of the pump well, and the other end of the feedthrough wire is connected to a power source. The lifting device is arranged at the top of the pump well, and the support rod of the lifting device passes through the pump well, and the bottom end of the support rod is connected to the submersible pump.

[0016] Optionally, the submersible pump system further includes an inflation pipeline, which includes an inflation main pipe, a first inflation branch pipe, and a second inflation branch pipe communicating with the outlet of the inflation main pipe. The inlet of the inflation main pipe is connected to a nitrogen gas source. The outlet of the first inflation branch pipe communicates with the air inlet of the feedthrough body, and the outlet of the second inflation branch pipe communicates with the gas passage of the lifting flange.

[0017] Optionally, a first pressure transmitter is provided on the first inflation branch pipe, and the first pressure transmitter is used to obtain and transmit the gas pressure value signal in the first inflation branch pipe. A second pressure transmitter is provided on the second inflation branch pipe, and the second pressure transmitter is used to obtain and transmit the gas pressure value signal in the second inflation branch pipe.

[0018] Optionally, a first shut-off valve and a first check valve are provided on the first inflation branch pipe, and a second shut-off valve and a second check valve are provided on the second inflation branch pipe.

[0019] The present invention also provides a cryogenic storage tank, including a tank body and the above-mentioned submersible pump system. The pump well is connected in the tank body, and the top of the pump well is located outside the tank body. The submersible pump is connected to the inlet of the liquid discharge pipe, and the outlet end of the liquid discharge pipe is communicated to the outside of the tank body through the interior of the pump well and from the top of the pump well.

[0020] As can be seen from the above technical solutions, the beneficial effects of the present invention are as follows: In the electrical feedthrough device, lifting device, submersible pump system, and cryogenic storage tank of the present invention, an air inlet is provided on the feedthrough body of the electrical feedthrough device. Nitrogen enters the isolation chamber of the feedthrough body through the air inlet to form a nitrogen gas seal isolation between the first channel of the first feedthrough body and the second channel of the second feedthrough body, preventing the media on both sides of the electrical feedthrough device from coming into contact with the atmosphere. At the same time, a gas channel is provided on the lifting flange of the lifting device. Nitrogen enters the installation space between the lifting flange and the support rod through the gas channel to form a nitrogen gas seal isolation between the lifting flange and the support rod, preventing the media on both sides of the lifting device from coming into contact with the atmosphere. Thus, it effectively prevents the media inside the tank from leaking at the lifting device and the electrical feedthrough device, avoids safety accidents caused by the contact between the media and the atmosphere, and improves the overall safety of the cryogenic storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an embodiment of the electrical feedthrough device of the present invention.

[0022] Figure 2 is a schematic structural diagram of an embodiment of the lifting device of the present invention.

[0023] Figure 3 is a schematic structural diagram of an embodiment of the submersible pump system and cryogenic storage tank of the present invention.

[0024] The descriptions of the reference numerals are as follows: 1000, cryogenic storage tank; 100, submersible pump system; 10, electrical feedthrough device; 11, feedthrough body; 111, first feedthrough body; 1111, body part; 1112, extension part; 112, second feedthrough body; 113, isolation chamber; 114, first channel; 115, second channel; 116, air inlet; 117, air outlet; 118, quick-connect fitting; 119, plugging head; 12, feedthrough wire; 13, sealing assembly; 131, first sealing sheet; 132, second sealing sheet; 133, first sealing ring; 134, second sealing ring; 135, third sealing ring; 14, first flange; 15, second flange; 20, lifting device; 21, lifting flange; 211, flange main body; 212, convex part; 213, gas channel; 22, lifting assembly; 221, lifting member; 222, support rod; 23, installation space; 24, sealing filler; 25, top cover; 251, cover main body; 252, connecting part; 26, protective cover; 30, pump well; 31, well main body; 32, roof flange; 40, submersible pump; 50, gas charging pipeline; 51, gas charging main pipe; 52, first gas charging branch pipe; 521, first stop valve; 522, first check valve; 53, second gas charging branch pipe; 531, second stop valve; 532, second check valve; 541, pressure gauge; 542, main pressure transmitter; 543, first pressure transmitter; 544, second pressure transmitter; 200, tank body. DETAILED DESCRIPTION

[0025] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0026] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] See also Figure 1 An embodiment of the present application provides an electrical feedthrough device 10 for achieving electrical isolation and ensuring the stability and safety of high voltage electricity. The electrical feedthrough device 10 of this embodiment includes a feedthrough body 11 , a feedthrough conductor 12 , and a sealing assembly 13 .

[0029] The feedthrough body 11 includes a first feedthrough body 111 and a second feedthrough body 112 connected to each other, and an isolation cavity 113 is formed between the first feedthrough body 111 and the second feedthrough body 112. The first feedthrough body 111 has a through first channel 114, and the second feedthrough body 112 has a through second channel 115. The first channel 114 and the second channel 115 are opposite to each other and are both connected to the isolation cavity 113. An air inlet 116 connected to the isolation cavity 113 is provided on the feedthrough body 11, and the air inlet 116 is used to introduce nitrogen to form a nitrogen gas-sealed isolation between the first channel 114 and the second channel 115.

[0030] The feedthrough conductor 12 is arranged in the first channel 114, the isolation cavity 113 and the second channel 115. One end of the feedthrough conductor 12 is used to connect with the submersible pump 40, and the other end is used to connect with the power supply. The sealing assembly 13 includes a first sealing sheet 131 and a second sealing sheet 132 arranged around the outside of the feedthrough conductor 12, the first sealing sheet 131 is arranged between the inner wall of the first feedthrough body 111 and the outer wall of the feedthrough conductor 12, and the second sealing sheet 132 is arranged between the inner wall of the second feedthrough body 112 and the outer wall of the feedthrough conductor 12.

[0031] In this embodiment, the first feedthrough 111 includes a main body 1111 and an annular extension portion 1112 with a hollow interior, and the extension portion 1112 is connected to one end of the main body 1111, so that a concave groove is formed on the side of the first feedthrough 111 facing the second feedthrough 112. A through first channel 114 is provided in the hollow interior of the main body 1111 corresponding to the extension portion 1112, and the first channel 114 is connected to the interior of the extension portion 1112.

[0032] One end of the extension portion 1112 facing away from the main body portion 1111 is connected to the side of the second feedthrough body 112, and the groove of the first feedthrough body 111 constitutes an isolation cavity 113 between the first feedthrough body 111 and the second feedthrough body 112. An air inlet 116 and an air outlet 117 are provided on the extension portion 1112, and the air inlet 116 and the air outlet 117 are arranged opposite to each other and are both used to communicate with the isolation cavity 113.

[0033] The air inlet 116 is used for introducing nitrogen so that the isolation chamber 113 is filled with nitrogen. When nitrogen is introduced into the air inlet 116, the air outlet 117 is in a blocked state. In this embodiment, a quick-connect joint 118 is provided at the air inlet 116 to achieve a quick connection between the air inlet 116 and the nitrogen supply pipeline. A plugging head 119 can be provided at the air outlet 117 to block the air outlet 117 when nitrogen is introduced.

[0034] The second feedthrough 112 of this embodiment is a plate-like structure, and is provided with a through second channel 115. The second feedthrough 112 is connected to the first feedthrough 111, and the second channel 115 is connected to the first channel 114 via the isolation cavity 113.

[0035] The feedthrough conductor 12 is arranged in the first channel 114, the isolation cavity 113 and the second channel 115. One end of the feedthrough conductor 12 is connected to the submersible pump 40, and the other end is connected to the power supply to realize the electrical feedthrough of the submersible pump 40 inside the pump well 30, and ensure the electrical connection between the submersible pump 40 and the external power supply of the pump well 30 for normal use. Among them, the side of the feedthrough conductor 12 close to the submersible pump 40 is the medium side, and the side of the feedthrough conductor 12 close to the power supply is the atmosphere side.

[0036] In this embodiment, the sealing assembly 13 includes a first sealing sheet 131 and a second sealing sheet 132. The first sealing sheet 131 is sealed between the inner wall of the first feedthrough body 111 and the outer wall of the feedthrough wire 12, and the second sealing sheet 132 is sealed between the inner wall of the second feedthrough body 112 and the outer wall of the feedthrough wire 12.

[0037] By providing the first sealing sheet 131 and the second sealing sheet 132, the feedthrough conductor 12 and the first feedthrough body 111 and the second feedthrough body 112 can be sealed to prevent the connection between the atmosphere side and the medium side, avoid leakage of the medium to the atmosphere side, and ensure the safety of the device.

[0038] For the electrical feedthrough device 10 of the present application, nitrogen is introduced into the isolation cavity 113 through the air inlet 116 on the feedthrough body 11, so that the isolation cavity 113 is filled with nitrogen, so as to form a nitrogen gas-sealed isolation in the isolation cavity 113, so that the nitrogen pressure is higher than the air pressure on the medium side and the atmospheric side, so that the nitrogen is gas-sealed and sealed between the medium side and the atmospheric side, so as to cooperate with the first sealing sheet 131 and the second sealing sheet 132 to strengthen the isolation between the medium side and the atmospheric side, prevent the medium from leaking from the pump well 30, and improve the safety of the device.

[0039] In this embodiment, the electrical feedthrough device 10 further includes a first flange 14 and a second flange 15 . The first flange 14 is arranged on a side of the first feedthrough 111 away from the second feedthrough 112 . The second flange 15 is arranged on a side of the second feedthrough 112 away from the first feedthrough 111 .

[0040] The first flange 14 and the second flange 15 are connected to each other by bolts, so that the first feedthrough 111 and the second feedthrough 112 are connected to each other to form an isolation cavity 113 between the first feedthrough 111 and the second feedthrough 112. The feedthrough conductor 12 is disposed inside the first flange 14 and the second flange 15.

[0041] In addition, in this embodiment, the sealing assembly 13 further includes a first sealing ring 133 , a second sealing ring 134 and a third sealing ring 135 .

[0042] Among them, the first sealing ring 133 is arranged at the connection between the first feedthrough body 111 and the second feedthrough body 112 to strengthen the sealing of the connection between the feedthrough body and the second feedthrough body 112. The second sealing ring 134 is arranged at the connection between the first feedthrough body 111 and the first flange 14, and the second sealing ring 134 is arranged around the outer periphery of the first channel 114 to strengthen the sealing of the connection between the first feedthrough body 111 and the first flange 14. The third sealing ring 135 is arranged at the connection between the second feedthrough body 112 and the second flange 15, and the third sealing ring 135 is arranged around the outer periphery of the second channel 115 to strengthen the sealing of the connection between the second feedthrough body 112 and the second flange 15.

[0043] By providing the first sealing ring 133 , the second sealing ring 134 and the third sealing ring 135 , the sealing inside the feedthrough body 11 and the sealing between the feedthrough body 11 and the first flange 14 and the second flange 15 can be strengthened to avoid leakage of the medium and ensure the overall safety of the electrical feedthrough device 10 .

[0044] See also Figure 2 An embodiment of the present application provides a lifting device 20 , which includes a lifting flange 21 and a lifting assembly 22 .

[0045] In this embodiment, the lifting flange 21 is used to be arranged on the pump well 30, and the interior of the lifting flange 21 is connected to the interior of the pump well 30. The lifting assembly 22 includes a lifting member 221 and a support rod 222 connected to the lifting member 221, and the support rod 222 is penetrated in the lifting flange 21 and the pump well 30. One end of the support rod 222 away from the lifting member 221 is used to connect with the submersible pump 40 inside the pump well 30, so that the submersible pump 40 rises or falls under the action of the lifting member 221.

[0046] An installation space 23 is formed between the inner wall of the hanging flange 21 and the support rod 222. The installation space 23 is filled with a sealing filler 24. The sealing filler 24 is arranged around the outer periphery of the support rod 222 and attached to the inner wall of the hanging flange 21. A gas channel 213 connected to the installation space 23 is provided on the hanging flange 21. The gas channel 213 is used to pass nitrogen to form a nitrogen gas seal isolation between the hanging flange 21 and the support rod 222.

[0047] In this embodiment, the hanging flange 21 includes a flange body 211 and a boss portion 212. The interior of the flange body 211 is hollow, and the boss portion 212 is annular and convexly arranged on the inner wall of the bottom end of the flange body 211. The support rod 222 is arranged inside the boss portion 212, and the inner wall of the flange body 211 and the support rod 222 form an installation space 23. The installation space 23 is filled with a sealing filler 24, and the bottom end of the sealing filler 24 abuts against the boss portion 212.

[0048] The sealing filler 24 of this embodiment can be made of asbestos fabric, carbon fiber, rubber, flexible graphite, engineering plastics, etc. In the installation space 23, the sealing filler 24 can be prefabricated into a ring or strip shape, and adopt a multi-ring or spiral multi-layer structure.

[0049] By setting a sealing filler 24 between the lifting flange 21 and the support rod 222, the medium in the pump well 30 can be prevented from leaking through the gap between the support rod 222 and the lifting flange 21, preventing the medium from contacting the atmosphere, avoiding the occurrence of safety accidents, and ensuring the overall safety of the device.

[0050] In this embodiment, a gas passage 213 is formed in the lifting flange 21, and the gas passage 213 communicates with the installation space 23. The gas passage 213 can be connected to a nitrogen supply pipeline to supply nitrogen to the installation space 23, so that nitrogen fills the installation space 23, thereby forming a nitrogen gas seal isolation between the lifting flange 21 and the support rod 222.

[0051] During the operation of the submersible pump 40, the vibration generated will cause the support rod 222 to shake, resulting in a decrease in the sealing performance of the sealing packing 24. By supplying nitrogen to the installation space 23 through the gas passage 213, the nitrogen gas seal isolation formed between the lifting flange 21 and the support rod 222 can cooperate with the sealing packing 24 to enhance the sealing performance between the lifting flange 21 and the support rod 222, effectively preventing the medium from entering the atmosphere and improving the safety of the device.

[0052] The lifting device 20 of this embodiment further includes a top cover 25, and the top cover 25 includes a cover body 251 and a connecting portion 252. Among them, the interior of the cover body 251 is hollow, and the connecting portion 252 protrudes from the outer periphery of the top of the cover body 251.

[0053] The connecting portion 252 is connected to the top of the flange main body 211 by bolts, so that the top cover 25 is fixed to the top of the lifting flange 21. The support rod 222 passes through the interior of the cover body 251, and the bottom end of the cover body 251 abuts against the top end of the sealing packing 24 to press the sealing packing 24 in the installation space 23 to ensure the sealing performance of the sealing packing 24.

[0054] In addition, the lifting device 20 further includes a protective cover 26. The protective cover 26 is fixed to the top of the lifting flange 21 by bolts, and the lifting member 221 is disposed inside the protective cover 26. The protective cover 26 can protect the lifting member 221, the top cover 25, and the top of the lifting flange 21, preventing the lifting member 221 from being eroded by external rain and dirt, and ensuring the overall structural stability of the lifting device 20.

[0055] Refer to Figure 3 In one embodiment of the present application, a submersible pump system 100 is further provided. The submersible pump system 100 includes a pump well 30, a submersible pump 40, an electrical feedthrough device 10, and a lifting device 20.

[0056] Among them, the pump well 30 is used to be connected in the tank body 200, and the top of the pump well 30 extends out of the tank body 200. The submersible pump 40 is disposed in the pump well 30 and arranged at the bottom of the pump well 30. The submersible pump 40 is used to pump the medium in the tank body 200 into the pump well 30, and the medium is then transported to the outside of the tank body 200 through the pump well 30.

[0057] In this embodiment, the pump well 30 includes a well main body 31 and a top plate flange 32 provided at the top of the well main body 31. The top of the well main body 31 extends outward from the tank body 200, and the top plate flange 32 is installed at the top of the well main body 31.

[0058] The electrical feedthrough device 10 and the lifting device 20 in the submersible pump system 100 are both as described above and will not be elaborated here. Among them, the electrical feedthrough device 10 is arranged at the top of the pump well 30. One end of the feedthrough wire 12 of the electrical feedthrough device 10 is connected to the submersible pump 40 through the inside of the pump well 30, and the other end is connected to the power supply outside the tank body 200, so as to realize the electrical connection of the submersible pump 40 and ensure the normal use of the submersible pump 40.

[0059] The lifting flange 21 of the lifting device 20 is connected to the top plate flange 32 of the well main body 31. The support rod 222 of the lifting device 20 is arranged in the pump well 30, and the bottom end of the support rod 222 is connected to the submersible pump 40. Under the action of the lifting member 221, the submersible pump 40 can descend or ascend in the pump well 30 to enter the bottom of the pump well 30 for installation or be pulled out of the pump well 30.

[0060] The submersible pump system 100 of this embodiment further includes an inflation pipeline 50. The inflation pipeline 50 includes an inflation main pipe 51 and a first inflation branch pipe 52 and a second inflation branch pipe 53 communicated with the outlet of the inflation main pipe 51.

[0061] Among them, the inlet of the inflation main pipe 51 is connected to the nitrogen gas source. The outlet of the first inflation branch pipe 52 is communicated with the air inlet 116 of the feedthrough body 11, and the outlet of the second inflation branch pipe 53 is communicated with the gas passage 213 of the lifting flange 21.

[0062] The inflation main pipe 51 is connected to the nitrogen gas source. Nitrogen enters the isolation cavity 113 of the feedthrough body 11 through the first inflation branch pipe 52 and enters the installation space 23 of the lifting device 20 through the second inflation branch pipe 53. The pressure of the nitrogen gas source is greater than the medium air pressure in the pump well 30. The nitrogen entering the isolation cavity 113 can form a nitrogen gas seal isolation between the first channel 114 of the first feedthrough body 111 and the second channel 115 of the second feedthrough body 112. The nitrogen entering the installation space 23 can form a nitrogen gas seal isolation between the lifting flange 21 and the support rod 222, so as to effectively prevent the medium inside the tank body 200 from leaking at the lifting device 20 and the electrical feedthrough device 10, prevent the medium from contacting the atmosphere and causing safety accidents, and improve the overall safety of the submersible pump system 100.

[0063] In this embodiment, a first stop valve 521 and a first check valve 522 are provided on the first inflation branch pipe 52, and a second stop valve 531 and a second check valve 532 are provided on the second inflation branch pipe 53.

[0064] The first shut-off valve 521 is used for the operator to manually control the on-off of the first gas charging branch pipe 52. The first check valve 522 is used to prevent the backflow of nitrogen in the first gas charging branch pipe 52 and prevent the sudden change of the nitrogen gas pressure in the isolation chamber 113 caused by the pressure change in the first gas charging branch pipe 52.

[0065] The second shut-off valve 531 is used for the operator to manually control the on-off of the second gas charging branch pipe 53. The second check valve 532 is used to prevent the backflow of nitrogen in the second gas charging branch pipe 53 and prevent the sudden change of the nitrogen gas pressure in the installation space 23 caused by the pressure change in the second gas charging branch pipe 53.

[0066] In this embodiment, a pressure gauge 541 and a main pressure transmitter 542 are provided on the gas charging main pipe 51. Among them, the pressure gauge 541 is used to locally display the pressure value of nitrogen in the gas charging main pipe 51, enabling the operator to timely know the gas pressure of nitrogen in the gas charging main pipe 51. The main pressure transmitter 542 is used to obtain the nitrogen gas pressure value signal in the gas charging main pipe 51 and transmit the obtained nitrogen gas pressure value signal to the background of the submersible pump system 100 for display. The operator can monitor the nitrogen gas pressure in the gas charging main pipe 51 in real time according to the displayed nitrogen gas pressure value signal in the background and effectively regulate it.

[0067] A first pressure transmitter 543 is provided on the first gas charging branch pipe 52 of this embodiment, and a second pressure transmitter 544 is provided on the second gas charging branch pipe 53.

[0068] Among them, the first pressure transmitter 543 is arranged downstream of the first check valve 522. The first pressure transmitter 543 is used to obtain the nitrogen gas pressure value signal in the first gas charging branch pipe 52 and transmit the obtained nitrogen gas pressure value signal to the background of the submersible pump system 100 for display. The operator can monitor the nitrogen gas pressure in the first gas charging branch pipe 52 in real time according to the displayed nitrogen gas pressure value signal in the background and effectively regulate it to ensure the stability and safety of the submersible pump system 100.

[0069] The second pressure transmitter 544 is arranged downstream of the second check valve 532. The second pressure transmitter 544 is used to obtain the nitrogen gas pressure value signal in the second gas charging branch pipe 53 and transmit the obtained nitrogen gas pressure value signal to the background of the submersible pump system 100 for display. The operator can monitor the nitrogen gas pressure in the second gas charging branch pipe 53 in real time according to the displayed nitrogen gas pressure value signal in the background and effectively regulate it to ensure the stability and safety of the submersible pump system 100.

[0070] Refer to Figure 3 In an embodiment of the present application, a cryogenic storage tank 1000 is further provided, which includes a tank body 200 and the above-mentioned submersible pump system 100.

[0071] Among them, the interior of the tank body 200 is used to hold cryogenic medium. The pump well 30 is connected to the tank body 200, and the top of the pump well 30 is located outside the tank body 200. The submersible pump 40 communicates with the inlet of the liquid outlet pipe, and the outlet end of the liquid outlet pipe is communicated to the outside of the tank body 200 through the inside of the pump well 30 from the top of the pump well 30 to output the cryogenic medium inside the tank body 200 to the outside.

[0072] In the cryogenic storage tank 1000 of this embodiment, the nitrogen gas entering the isolation chamber 113 can form a nitrogen gas seal isolation between the first channel 114 of the first feed body 111 and the second channel 115 of the second feed body 112, and the nitrogen gas entering the installation space 23 can form a nitrogen gas seal isolation between the lifting flange 21 and the support rod 222, so as to effectively prevent the medium inside the tank body 200 from leaking at the lifting device 20 and the electrical feedthrough device 10, prevent the medium from contacting the atmosphere and causing safety accidents, and improve the overall safety of the cryogenic storage tank 1000.

[0073] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be construed broadly within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An electrical feedthrough device, characterized in that, include: A feedthrough body, comprising a first feedthrough body and a second feedthrough body connected to each other, wherein an isolation cavity is formed between the first feedthrough body and the second feedthrough body; The first feedthrough body has a through first channel, the second feedthrough body has a through second channel, the first channel and the second channel are opposite to each other and both are connected to the isolation cavity; an air inlet connected to the isolation cavity is provided on the feedthrough body, and the air inlet is used to introduce nitrogen to form a nitrogen gas-sealed isolation between the first channel and the second channel; A feed-through conductor is provided through the first channel, the isolation cavity and the second channel; One end of the feedthrough wire is used to be connected to the submersible pump, and the other end of the feedthrough wire is used to be connected to the power supply; A sealing assembly, comprising a first sealing sheet and a second sealing sheet arranged in a ring outside the feedthrough conductor, wherein the first sealing sheet is arranged between the inner wall of the first feedthrough body and the outer wall of the feedthrough conductor, and the second sealing sheet is arranged between the inner wall of the second feedthrough body and the outer wall of the feedthrough conductor; Among them, a groove is concavely provided on the side of the first feedthrough body facing the second feedthrough body, the groove is communicated with the first channel, the first feedthrough body is connected with the second feedthrough body, and the groove constitutes the isolation cavity; the air inlet is opened on the side wall of the groove of the first feedthrough body; an air outlet is also opened on the feedthrough body, and the air outlet is communicated with the isolation cavity; when nitrogen is passed into the air inlet, the air outlet is in a blocked state.

2. The electrical feedthrough device according to claim 1, characterized in that, The electrical feed-through device further comprises a quick-connect connector, which is arranged at the air inlet and is used to communicate with a nitrogen supply pipeline.

3. The electrical feedthrough device according to claim 1, characterized in that, The electrical feedthrough device also includes a first flange and a second flange, the first flange is arranged on a side of the first feedthrough body away from the second feedthrough body, and the second flange is arranged on a side of the second feedthrough body away from the first feedthrough body; the first flange and the second flange are connected to each other, so that the first feedthrough body and the second feedthrough body are butt-connected; the feedthrough wire is passed through the inside of the first flange and the second flange.

4. The electrical feedthrough device according to claim 3, characterized in that, The sealing assembly also includes a first sealing ring, a second sealing ring and a third sealing ring; the first sealing ring is arranged between the first feedthrough body and the second feedthrough body, and is arranged around the outer periphery of the isolation cavity; the second sealing ring is arranged between the first feedthrough body and the first flange, and is arranged around the outer periphery of the first channel; the third sealing ring is arranged between the second feedthrough body and the second flange, and is arranged around the outer periphery of the second channel.

5. A submersible pump system, characterized in that, include: A pump well is used to be connected in the tank body, and the top of the pump well protrudes out of the tank body. A submersible pump is disposed in the pump well and arranged at the bottom of the pump well; The electrical feedthrough device according to any one of claims 1 to 4, wherein the electrical feedthrough device is arranged at the top of the pump well, one end of the feedthrough wire of the electrical feedthrough device is connected to the submersible pump through the inside of the pump well, and the other end of the feedthrough wire is connected to a power supply; A lifting device is arranged at the top of the pump well, and the lifting device includes a lifting flange and a lifting assembly; the lifting flange is arranged on the pump well, and the interior of the lifting flange is communicated with the interior of the pump well; the lifting assembly includes a lifting piece and a supporting rod connected to the lifting piece, the supporting rod is penetrated through the lifting flange and the pump well, and one end of the supporting rod away from the lifting piece is used to connect with the submersible pump inside the pump well, so that the submersible pump rises or falls under the action of the lifting piece; An installation space is formed between the inner wall of the hanging flange and the supporting rod, and the installation space is filled with sealing filler. The sealing filler ring is arranged on the outer periphery of the supporting rod and attached to the inner wall of the hanging flange. A gas channel connected to the installation space is opened on the hanging flange, and the gas channel is used to pass nitrogen to form a nitrogen gas-tight isolation between the hanging flange and the supporting rod.

6. The submersible pump system according to claim 5, characterized in that, The submersible pump system also includes an inflation pipeline, which includes an inflation main pipe and a first inflation branch pipe and a second inflation branch pipe connected to the outlet of the inflation main pipe; the inlet of the inflation main pipe is connected to a nitrogen gas source, the outlet of the first inflation branch pipe is connected to the air inlet of the feed-through body, and the outlet of the second inflation branch pipe is connected to the gas channel of the lifting flange.

7. The submersible pump system according to claim 6, characterized in that, A first pressure transmitter is provided on the first inflation branch pipe, and the first pressure transmitter is used to obtain and transmit the gas pressure value signal in the first inflation branch pipe; a second pressure transmitter is provided on the second inflation branch pipe, and the second pressure transmitter is used to obtain and transmit the gas pressure value signal in the second inflation branch pipe.

8. The submersible pump system according to claim 6, wherein, The first inflation branch pipe is provided with a first stop valve and a first check valve, and the second inflation branch pipe is provided with a second stop valve and a second check valve.

9. The submersible pump system according to claim 5, characterized in that, The lifting flange includes a flange body and a boss portion, the interior of the flange body is hollow; the boss portion is annular and protrudes from the inner wall of the flange body, the support rod is passed through the interior of the boss portion, the installation space is formed between the inner wall of the flange body and the support rod, and the bottom end of the sealing filler abuts against the boss portion.

10. The submersible pump system according to claim 9, wherein, The hanging flange also includes a top cover, which includes a cover body and a connecting portion. The cover body is hollow inside, and the connecting portion is protruding from the outer periphery of the top end of the cover body. The connecting portion is connected to the top of the flange body so that the top cover is fixed to the top of the hanging flange; the supporting rod is passed through the interior of the cover body, and the bottom end of the cover body abuts against the top end of the sealing filler.

11. The submersible pump system according to claim 5, wherein, The lifting device also includes a protective cover, which is fixed on the top of the lifting flange, and the lifting member is located inside the protective cover.

12. A low-temperature storage tank, characterized in that, It comprises a tank body and a submersible pump system as described in any one of claims 5 to 11, wherein the pump well is connected in the tank body, and the top of the pump well is located outside the tank body; the submersible pump is connected to the inlet of a liquid outlet pipe, and the outlet end of the liquid outlet pipe is connected to the outside of the tank body through the top of the pump well via the inside of the pump well.

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