CN116928566A - Electrical feed-through device, lifting device, immersed pump system and low-temperature storage tank - Google Patents

Abstract

The application provides an electric feed-through device, a hoisting device, a immersed pump system and a low-temperature storage tank, wherein a feed-through body of the electric feed-through device is provided with an air inlet, nitrogen enters an isolation cavity of the feed-through body from the air inlet so as to form nitrogen gas seal isolation between a first channel of a first feed-through body and a second channel of a second feed-through body, and the contact between media at two sides of the electric feed-through device and the atmosphere is avoided; meanwhile, the lifting flange of the lifting device is provided with a gas channel, nitrogen enters the installation space between the lifting flange and the supporting rod through the gas channel, so that nitrogen gas seal isolation is formed between the lifting flange and the supporting rod, the contact between media at two sides of the lifting device and the atmosphere is avoided, the leakage of the media in the tank body from the lifting device and the electric feed-through device is effectively prevented, the safety accident caused by the contact between the media and the atmosphere is avoided, and the overall safety of the low-temperature storage tank is improved.

Description

Electrical feed-through device, lifting device, immersed pump system and low-temperature storage tank

Technical Field

The application relates to the technical field of low-temperature medium storage containers, in particular to an electric feed-through device, a hoisting device, a immersed pump system and a low-temperature storage tank.

Background

The storage tanks for storing cryogenic media such as liquefied natural gas or liquid ethylene are increasingly used, and have complex structures and leakage risks in the operation process. The main dangerous leakage point of the pump well is a pump well electric feed-through device and a immersed pump hoisting mechanism outside the top cover of the storage tank.

When the low-temperature storage tank discharges liquid, the immersed pump in the pump well is electrified and operated, the electric feed-through device ensures the stability and safety of high-voltage electricity consumption, and electric isolation is effectively carried out, but after the sealing in the electric feed-through device fails, medium in the pump well can leak through the threading pipe, so that safety accidents are caused. The immersed pump hoisting mechanism is used for hoisting the immersed pump, and vibration is generated in the operation of the immersed pump to loosen bolts in the hoisting mechanism, so that sealing in the hoisting mechanism is invalid, medium leakage in a pump well cannot be blocked, and safety accidents are caused.

Disclosure of Invention

The application aims to solve the technical problem of safety accidents caused by medium leakage in a pump well of a low-temperature storage tank in the prior art.

In order to solve the technical problems, the application provides an electrical feed-through device, which comprises a feed-through body, a feed-through wire and a sealing component; the feed-through body comprises a first feed-through body and a second feed-through body which are in butt joint, and an isolation cavity is formed between the first feed-through body and the second feed-through body; the first feedthrough body is provided with a first channel penetrating through the first feedthrough body, the second feedthrough body is provided with a second channel penetrating through the second feedthrough body, and the first channel and the second channel are opposite and are communicated with the isolation cavity; the feed-through body is provided with an air inlet communicated with the isolation cavity, and the air inlet is used for introducing nitrogen so as to form nitrogen gas seal isolation between the first channel and the second channel; the feed-through wire penetrates through the first channel, the isolation cavity and the second channel; one end of the feed-through wire is used for being communicated with the immersed pump, and the other end of the feed-through wire is used for being communicated with a power supply; the seal assembly includes a first seal tab and a second seal tab disposed around the outside of the feed-through wire, the first seal tab disposed between an inner wall of the first feed-through body and an outer wall of the feed-through wire, the second seal tab disposed between an inner wall of the second feed-through body and an outer wall of the feed-through wire.

Optionally, a groove is concavely formed on one side, facing the second feedthrough, of the first feedthrough, the groove is communicated with the first channel, the first feedthrough is in butt joint with the second feedthrough, and the groove forms the isolation cavity; the air inlet is formed in the side wall of the groove of the first feed-through body.

Optionally, an air outlet is further formed in the feed-through body, and the air outlet is communicated with the isolation cavity; when the nitrogen is introduced into the air inlet, the air outlet is in a blocking state.

Optionally, the electrical feed-through device further comprises a quick connector provided at the gas inlet for communicating with a nitrogen supply line.

Optionally, the electrical feed-through device further comprises a first flange and a second flange, the first flange is arranged at one side of the first feed-through body facing away from the second feed-through body, and the second flange is arranged at one side of the second feed-through body facing away from the first feed-through body; the first flange is butted with the second flange, so that the first feedthrough body is butted with the second feedthrough body; the feed-through wire penetrates through the first flange and the second flange.

Optionally, the sealing assembly further comprises a first sealing ring, a second sealing ring and a third sealing ring; the first sealing ring is arranged between the first feed-through body and the second feed-through body and is annularly arranged on the periphery of the isolation cavity; the second sealing ring is arranged between the first feed-through body and the first flange and is annularly arranged on the periphery of the first channel; the third sealing ring is arranged between the second feed-through body and the second flange, and is annularly arranged on the periphery of the second channel.

The application also provides a hoisting device, which comprises a hoisting flange and a hoisting assembly, wherein the hoisting flange is arranged on the pump well, and the interior of the hoisting flange is communicated with the interior of the pump well; the hoisting assembly comprises a hoisting member and a supporting rod connected with the hoisting member, the supporting rod penetrates through the hoisting flange and the pump well, and one end of the supporting rod, which is away from the hoisting member, is used for being connected with a immersed pump in the pump well so that the immersed pump ascends or descends under the action of the hoisting member; an installation space is formed between the inner wall of the hoisting flange and the supporting rod, the installation space is filled with sealing filler, and the sealing filler is annularly arranged on the periphery of the supporting rod and attached to the inner wall of the hoisting flange; the lifting flange is provided with a gas channel communicated with the installation space, and the gas channel is used for introducing nitrogen so as to form nitrogen gas seal isolation between the lifting flange and the supporting rod.

Optionally, the hoisting flange comprises a flange main body and a boss part, and the interior of the flange main body is hollow; the boss part is annular and is convexly arranged on the inner wall of the flange main body, the supporting rod penetrates through the boss part, the installation space is formed between the inner wall of the flange main body and the supporting rod, and the bottom end of the sealing filler is abutted to the boss part.

Optionally, the hoisting flange further comprises a top cover, the top cover comprises a cover main body and a connecting part, the cover main body is hollow, the connecting part is convexly arranged on the periphery of the top end of the cover main body, and the connecting part is connected with the top of the flange main body so that the top cover is fixed on the top of the hoisting flange; the support rod penetrates through the cover main body, and the bottom end of the cover main body is abutted to the top end of the sealing filler.

Optionally, the hoisting device further comprises a protective cover, the protective cover is fixed at the top of the hoisting flange, and the hoisting piece is located in the protective cover.

The application also provides a immersed pump system, which comprises a pump well, an immersed pump, an electric feed-through device and a hoisting device, wherein the pump well is used for being connected in a tank body, the top of the pump well extends out of the tank body, and the immersed pump is arranged in the pump well and is arranged at the bottom of the pump well; the electric feed-through device is arranged at the top of the pump well, one end of a feed-through wire of the electric feed-through device is communicated with the immersed pump through the inside of the pump well, and the other end of the feed-through wire is communicated with a power supply; the lifting device is arranged at the top of the pump well, a supporting rod of the lifting device penetrates through the pump well, and the bottom end of the supporting rod is connected with the immersed pump.

Optionally, the immersed pump system further comprises an inflation pipeline, wherein the inflation pipeline comprises an inflation main pipe, and a first inflation branch pipe and a second inflation branch pipe which are communicated with the outlet of the inflation main pipe; the inlet of the main inflation pipe is communicated with a nitrogen source, the outlet of the first inflation branch pipe is communicated with the air inlet of the feed-through body, and the outlet of the second inflation branch pipe is communicated with the gas channel of the lifting flange.

Optionally, a first pressure transmitter is arranged on the first inflation branch pipe, and the first pressure transmitter is used for acquiring and transmitting a gas pressure value signal in the first inflation branch pipe; the second inflation branch pipe is provided with a second pressure transmitter, and the second pressure transmitter is used for acquiring and transmitting a gas pressure value signal in the second inflation branch pipe.

Optionally, 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.

The application also provides a low-temperature storage tank, which comprises a tank body and the immersed pump system, wherein the pump well is connected in the tank body, and the top of the pump well is positioned outside the tank body; the immersed pump is communicated with the inlet of the liquid outlet pipe, and the outlet end of the liquid outlet pipe is communicated with the outside of the tank body from the top of the pump well through the inside of the pump well.

According to the technical scheme, the beneficial effects of the application are as follows: in the electric feed-through device, the hoisting device, the immersed pump system and the low-temperature storage tank, the feed-through body of the electric feed-through device is provided with the air inlet, and nitrogen enters the isolation cavity of the feed-through body from the air inlet so as to form nitrogen gas seal isolation between the first channel of the first feed-through body and the second channel of the second feed-through body, thereby avoiding contact between media and atmosphere at two sides of the electric feed-through device; meanwhile, the lifting flange of the lifting device is provided with a gas channel, nitrogen enters the installation space between the lifting flange and the supporting rod through the gas channel, so that nitrogen gas seal isolation is formed between the lifting flange and the supporting rod, the contact between media at two sides of the lifting device and the atmosphere is avoided, the leakage of the media in the tank body from the lifting device and the electric feed-through device is effectively prevented, the safety accident caused by the contact between the media and the atmosphere is avoided, and the overall safety of the low-temperature storage tank is improved.

Drawings

Fig. 1 is a schematic diagram of an embodiment of an electrical feedthrough device of the present application.

Fig. 2 is a schematic structural view of an embodiment of the lifting device of the present application.

FIG. 3 is a schematic diagram of an exemplary embodiment of a submersible pumping system and cryogenic tank of the present application.

The reference numerals are explained as follows: 1000. a low temperature storage tank; 100. a immersed pump system; 10. an electrical feed-through; 11. a feedthrough body; 111. a first feedthrough; 1111. a body portion; 1112. an extension; 112. a second feedthrough; 113. an isolation chamber; 114. a first channel; 115. a second channel; 116. an air inlet; 117. an air outlet; 118. a quick-connect joint; 119. a blocking head; 12. a feed-through wire; 13. a seal assembly; 131. a first sealing sheet; 132. a second sealing sheet; 133. a first seal ring; 134. a second seal ring; 135. a third seal ring; 14. a first flange; 15. a second flange; 20. a hoisting device; 21. hoisting the flange; 211. a flange main body; 212. a boss portion; 213. a gas channel; 22. hoisting the assembly; 221. a lifting member; 222. a support rod; 23. an installation space; 24. sealing filler; 25. a top cover; 251. a cover main body; 252. a connection part; 26. a protective cover; 30. a pump well; 31. a well body; 32. a top plate flange; 40. a immersed pump; 50. an inflation line; 51. an inflatable main pipe; 52. a first inflation manifold; 521. a first stop valve; 522. a first check valve; 53. a second inflation manifold; 531. a second shut-off valve; 532. a second check valve; 541. a pressure gauge; 542. a main pressure transmitter; 543. a first pressure transmitter; 544. a second pressure transmitter; 200. a tank body.

Detailed Description

Exemplary embodiments that embody features and advantages of the present application will be described in detail in the following description. It will be understood that the application is capable of various modifications in various embodiments, all without departing from the scope of the application, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the application.

In the description of the present application, it should be understood that in the embodiments shown in the drawings, indications of directions or positional relationships (such as up, down, left, right, front, rear, etc.) are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1, an embodiment of the present application provides an electrical feedthrough device 10 for achieving electrical isolation and ensuring high voltage power usage stability and safety. The electrical feedthrough device 10 of the present embodiment includes a feedthrough body 11, a feedthrough lead 12, and a seal assembly 13.

The feedthrough body 11 includes a first feedthrough 111 and a second feedthrough 112 that are butted together, and an isolation cavity 113 is formed between the first feedthrough 111 and the second feedthrough 112. The first feedthrough 111 has a first passageway 114 therethrough, and the second feedthrough 112 has a second passageway 115 therethrough, the first passageway 114 and the second passageway 115 being opposite and each communicating with the isolation chamber 113. The feed-through body 11 is provided with an air inlet 116 communicated with the isolation cavity 113, and the air inlet 116 is used for introducing nitrogen so as to form nitrogen gas seal isolation between the first channel 114 and the second channel 115.

The feed-through wire 12 is disposed through the first channel 114, the isolation cavity 113 and the second channel 115. One end of feed-through wire 12 is adapted to be connected to immersed pump 40 and the other end is adapted to be connected to a power source. The sealing assembly 13 comprises a first sealing piece 131 and a second sealing piece 132, which are arranged around the outside of the feed-through 12, the first sealing piece 131 being arranged between the inner wall of the first feed-through 111 and the outer wall of the feed-through 12, and the second sealing piece 132 being arranged between the inner wall of the second feed-through 112 and the outer wall of the feed-through 12.

In this embodiment, the first feedthrough 111 includes a body 1111 and an annular hollow extension 1112, and the extension 1112 is connected to one end of the body 1111, so that a concave groove is formed on a side of the first feedthrough 111 facing the second feedthrough 112. The body 1111 is provided with a first passage 114 corresponding to the hollow interior of the extension 1112, and the first passage 114 communicates with the interior of the extension 1112.

The end of the extension 1112 facing away from the body 1111 is connected to a side of the second feedthrough 112, the recess of the first feedthrough 111 constituting an isolation cavity 113 between the first feedthrough 111 and the second feedthrough 112. The extension portion 1112 is provided with an air inlet 116 and an air outlet 117, and the air inlet 116 and the air outlet 117 are oppositely arranged and are both used for communicating with the isolation cavity 113.

The gas inlet 116 is used for introducing nitrogen gas, so that the isolation cavity 113 is filled with nitrogen gas. When the nitrogen is introduced into the gas inlet 116, the gas outlet 117 is in a blocking state. In the present embodiment, a quick connector 118 is disposed at the air inlet 116, so as to realize quick connection between the air inlet 116 and the nitrogen supply pipeline. A blocking head 119 may be disposed at the gas outlet 117 to block the gas outlet 117 when nitrogen is introduced.

The second feedthrough 112 of the present embodiment is a plate-like structure provided with a second channel 115 therethrough. The second feedthrough 112 is connected to the first feedthrough 111, and the second passageway 115 communicates with the first passageway 114 via the isolation chamber 113.

The feed-through wire 12 is inserted into the first channel 114, the isolation cavity 113 and the second channel 115, one end of the feed-through wire 12 is connected with the immersed pump 40, and the other end is connected with the power supply, so as to realize the electrical feed-through of the immersed pump 40 in the pump well 30, and ensure the electrical connection between the immersed pump 40 and the external power supply of the pump well 30 for normal use. Wherein the side of the feed-through wire 12 close to the immersed pump 40 is the medium side, and the side of the feed-through wire 12 close to the power supply is the atmosphere side.

In the present embodiment, the seal assembly 13 includes a first seal piece 131 and a second seal piece 132. The first sealing piece 131 seals between the inner wall of the first feedthrough 111 and the outer wall of the feedthrough 12, and the second sealing piece 132 seals between the inner wall of the second feedthrough 112 and the outer wall of the feedthrough 12.

By providing the first sealing piece 131 and the second sealing piece 132, sealing between the feed-through wire 12 and the first and second feed-through bodies 111, 112 can be realized, communication between the atmosphere side and the medium side is prevented, leakage of the medium to the atmosphere side is avoided, and safety of the device is ensured.

For the electric feed-through device 10, nitrogen is introduced into the isolation cavity 113 through the air inlet 116 on the feed-through body 11, so that the isolation cavity 113 is filled with the nitrogen, and a nitrogen gas seal isolation is formed in the isolation cavity 113, so that the nitrogen pressure is higher than the air pressure of the medium side and the air side, and the nitrogen gas is subjected to gas seal sealing between the medium side and the air side, so that the isolation between the medium side and the air side is enhanced by matching the first sealing piece 131 and the second sealing piece 132, the medium is prevented from leaking from the pump well 30, and the safety of the device is improved.

In this embodiment, the electrical feed-through device 10 further comprises a first flange 14 and a second flange 15, the first flange 14 being arranged on the side of the first feed-through 111 facing away from the second feed-through 112, the second flange 15 being arranged on the side of the second feed-through 112 facing away from the first feed-through 111.

The first flange 14 and the second flange 15 are butted by bolts so that the first feedthrough 111 and the second feedthrough 112 are butted to form an isolated cavity 113 between the first feedthrough 111 and the second feedthrough 112. The feed-through wire 12 is arranged through the inside of the first flange 14 and the second flange 15.

In addition, in the present embodiment, the seal assembly 13 further includes a first seal ring 133, a second seal ring 134, and a third seal ring 135.

The first sealing ring 133 is disposed at the connection between the first feedthrough 111 and the second feedthrough 112 to enhance the tightness of the connection between the feedthrough and the second feedthrough 112. The second sealing ring 134 is disposed at the connection between the first feedthrough 111 and the first flange 14, and the second sealing ring 134 is disposed around the outer periphery of the first channel 114, so as to enhance the tightness of the connection between the first feedthrough 111 and the first flange 14. A third sealing ring 135 is disposed at the junction of the second feedthrough 112 and the second flange 15, and the third sealing ring 135 is disposed around the second channel 115 to enhance the tightness of the junction of the second feedthrough 112 and the second flange 15.

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 enhanced, thereby avoiding leakage of medium and ensuring the overall safety of the electrical feedthrough device 10.

Referring to fig. 2, an embodiment of the present application provides a lifting device 20, where the lifting device 20 includes a lifting flange 21 and a lifting assembly 22.

In the present embodiment, the lifting flange 21 is adapted to be disposed on the pump well 30, and the interior of the lifting flange 21 communicates with the interior of the pump well 30. The hoisting assembly 22 comprises a hoisting member 221 and a support rod 222 connected to the hoisting member 221, the support rod 222 being arranged in the hoisting flange 21 and the pump well 30 in a penetrating manner. The end of the support rod 222 facing away from the lifting member 221 is adapted to be connected to the submersible pump 40 inside the pump well 30 so that the submersible pump 40 is raised or lowered by the lifting member 221.

Wherein, a mounting space 23 is formed between the inner wall of the lifting flange 21 and the supporting rod 222, the mounting space 23 is filled with a sealing filler 24, and the sealing filler 24 is annularly arranged on the outer periphery of the supporting rod 222 and is attached to the inner wall of the lifting flange 21. The lifting flange 21 is provided with a gas channel 213 communicated with the installation space 23, and the gas channel 213 is used for introducing nitrogen so as to form nitrogen gas sealing isolation between the lifting flange 21 and the supporting rod 222.

In the present embodiment, the hoist flange 21 includes a flange main body 211 and a boss portion 212. The flange main body 211 is hollow, and the boss 212 is annular and is provided on the inner wall of the bottom end of the flange main body 211. The support rod 222 is inserted into the boss 212, and an installation space 23 is formed between the support rod 222 and the inner wall of the flange main body 211. The installation space 23 is filled with a packing 24, and the bottom end of the packing 24 abuts against the boss portion 212.

The sealing filler 24 of the present embodiment may be asbestos cloth, carbon fiber, rubber, flexible graphite, engineering plastic, or the like. In the installation space 23, the sealing packing 24 may be prefabricated in a ring shape or a bar shape, and may have a multi-ring or spiral multi-layer structure.

By arranging the sealing filler 24 between the lifting flange 21 and the supporting rod 222, the leakage of the medium in the pump well 30 from the gap between the supporting rod 222 and the lifting flange 21 can be avoided, the contact of the medium with the atmosphere can be prevented, the occurrence of safety accidents can be avoided, and the overall safety of the device can be ensured.

In this embodiment, the lifting flange 21 is provided with a gas channel 213, and the gas channel 213 is communicated with the installation space 23. The gas channel 213 may be connected to a nitrogen gas supply line to supply nitrogen gas to the installation space 23 so that the installation space 23 is filled with nitrogen gas, thereby forming a nitrogen gas seal between the lifting flange 21 and the support rod 222.

Vibration of the immersed pump 40 during operation can shake the support rod 222, resulting in reduced tightness of the packing 24. The nitrogen is conveyed to the installation space 23 through the gas channel 213, and the nitrogen gas seal formed between the lifting flange 21 and the supporting rod 222 is isolated, so that the sealing property between the lifting flange 21 and the supporting rod 222 can be enhanced by matching with the sealing filler 24, the medium is effectively prevented from entering the atmosphere, and the safety of the device is improved.

The lifting device 20 of the present embodiment further includes a top cover 25, and the top cover 25 includes a cover main body 251 and a connection portion 252. Wherein, the inside of the cover main body 251 is hollow, and the connection part 252 is convexly arranged at the outer circumference of the top of the cover main body 251.

The connection 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 hoist flange 21. The supporting rod 222 is inserted into the cover main body 251, and the bottom end of the cover main body 251 is abutted against the top end of the sealing filler 24, so that the sealing filler 24 is pressed in the installation space 23, and the tightness of the sealing filler 24 is ensured.

Furthermore, the lifting device 20 comprises a protective cover 26. The protection cover 26 is fixed to the top of the hoisting flange 21 by bolts, and the hoisting member 221 is provided inside the protection cover 26. The protection cover 26 can protect the lifting piece 221, the top cover 25 and the top of the lifting flange 21, prevent external rainwater and dirt from corroding the lifting piece 221, and ensure the overall structural stability of the lifting device 20.

Referring to FIG. 3, an embodiment of the present application also provides a submersible pump system 100, the submersible pump system 100 comprising a pump well 30, a submersible pump 40, an electrical feed-through 10, and a hoist 20.

Wherein the pump well 30 is configured to be coupled to the tank 200, and the top of the pump well 30 extends out of the tank 200. The immersed pump 40 is disposed in the pump well 30 and is disposed at the bottom of the pump well 30. The immersed pump 40 is used for pumping the medium in the tank 200 into the pump well 30, and the medium is transported to the outside of the tank 200 through the pump well 30.

In this embodiment, pump well 30 includes a well body 31 and a top plate flange 32 disposed atop well body 31. The top of the well body 31 extends outwardly from the tank 200 and a roof flange 32 is mounted on top of the well body 31.

The electrical feed-through device 10 and the lifting device 20 in the immersed pump system 100 are described above, and are not described herein. Wherein, the electrical feed-through device 10 is disposed at the top of the pump well 30, one end of the feed-through wire 12 of the electrical feed-through device 10 is connected with the immersed pump 40 through the inside of the pump well 30, and the other end is connected with the power supply outside the tank 200, thereby realizing the electrical connection of the immersed pump 40 and ensuring the normal use of the immersed pump 40.

The lifting flange 21 of the lifting device 20 is connected to the top plate flange 32 of the well body 31, the supporting rod 222 of the lifting device 20 is penetrated in the pump well 30, and the bottom end of the supporting rod 222 is connected with the immersed pump 40. The submersible pump 40 may be lowered or raised in the pump well 30 by the lifting member 221 to enter the bottom of the pump well 30 for installation or pulled out of the pump well 30.

The immersed pump system 100 of the present embodiment further includes an inflation line 50, and the inflation line 50 includes an inflation main pipe 51, and a first inflation branch pipe 52 and a second inflation branch pipe 53 that are communicated with an outlet of the inflation main pipe 51.

Wherein the inlet of the main inflation tube 51 is connected with a nitrogen source. The outlet of the first gas-filled branch pipe 52 communicates with the gas inlet 116 of the feed-through body 11, and the outlet of the second gas-filled branch pipe 53 communicates with the gas passage 213 of the lifting flange 21.

The main inflation pipe 51 is connected to a nitrogen source, which is at a pressure greater than the pressure of the medium in the pump well 30, by means of the first inflation branch pipe 52 into the isolation chamber 113 of the feed-through body 11 and by means of the second inflation branch pipe 53 into the installation space 23 of the hoisting device 20. The nitrogen entering the isolation cavity 113 can form nitrogen gas seal isolation between the first channel 114 of the first feed-through body 111 and the second channel 115 of the second feed-through body 112, the nitrogen entering the installation space 23 can form nitrogen gas seal isolation between the hoisting flange 21 and the supporting rod 222, so that leakage of medium inside the tank 200 from the hoisting device 20 and the electric feed-through device 10 is effectively avoided, safety accidents caused by contact of the medium with the atmosphere are prevented, and the overall safety of the immersed pump system 100 is improved.

In the present embodiment, the first air charge branch pipe 52 is provided with a first shut-off valve 521 and a first check valve 522, and the second air charge branch pipe 53 is provided with a second shut-off valve 531 and a second check valve 532.

The first stop valve 521 is used for an operator to manually control the on-off of the first gas-filling branch pipe 52, and the first check valve 522 is used for preventing the backflow of the nitrogen in the first gas-filling branch pipe 52 and preventing the abrupt change of the pressure in the first gas-filling branch pipe 52 from causing the abrupt change of the nitrogen pressure in the isolation chamber 113.

The second shut-off valve 531 is used for an operator to manually control the on-off of the second gas-filled branch pipe 53, and the second check valve 532 is used for preventing the backflow of nitrogen in the second gas-filled branch pipe 53 and preventing abrupt changes in the pressure of nitrogen in the installation space 23 caused by pressure changes in the second gas-filled branch pipe 53.

In this embodiment, a pressure gauge 541 and a main pressure transmitter 542 are provided on the inflation main pipe 51. The pressure gauge 541 is configured to display a pressure value of the nitrogen in the main inflation pipe 51 on site, so that an operator can know the air pressure of the nitrogen in the main inflation pipe 51 in time. The main pressure transmitter 542 is used for acquiring the nitrogen pressure value signal in the inflation main pipe 51, and transmitting the acquired nitrogen pressure value signal to the background of the immersed pump system 100 for display. An operator can monitor the nitrogen pressure in the main inflation pipe 51 in real time in the background according to the displayed nitrogen pressure value signal and effectively regulate and control the nitrogen pressure.

The first inflation manifold 52 of the present embodiment is provided with a first pressure transmitter 543, and the second inflation manifold 53 is provided with a second pressure transmitter 544.

Wherein, a first pressure transmitter 543 is disposed downstream of the first check valve 522, and the first pressure transmitter 543 is configured to acquire a nitrogen pressure value signal in the first inflation branch pipe 52, and transmit the acquired nitrogen pressure value signal to the background of the immersed pump system 100 for displaying. An operator can monitor the nitrogen pressure in the first inflation manifold 52 in real time in the background according to the displayed nitrogen pressure value signal and effectively regulate it to ensure the stability and safety of the immersed pump system 100.

A second pressure transmitter 544 is disposed downstream of the second check valve 532, the second pressure transmitter 544 being configured to acquire a pressure value signal of the nitrogen in the second inflation manifold 53 and transmit the acquired nitrogen pressure value signal to the background of the immersed pump system 100 for display. An operator can monitor the pressure of the nitrogen in the second inflation branch pipe 53 in real time in the background according to the displayed nitrogen pressure value signal, and effectively regulate and control the same, so as to ensure the stability and safety of the immersed pump system 100.

Referring to fig. 3, an embodiment of the present application further provides a cryogenic tank 1000, which includes a tank body 200 and the immersed pump system 100 described above.

Wherein the inside of the can 200 is used to hold a cryogenic medium. Pump well 30 is connected in tank 200, with the top of pump well 30 being located outside of tank 200. The immersed pump 40 communicates with the inlet of a liquid outlet pipe, the outlet end of which communicates from the top of the pump well 30 to the outside of the tank 200 via the inside of the pump well 30 to output the cryogenic medium inside the tank 200 to the outside.

In the cryogenic tank 1000 of the present embodiment, nitrogen entering the isolation cavity 113 can form a nitrogen gas seal isolation between the first channel 114 of the first feedthrough 111 and the second channel 115 of the second feedthrough 112, and nitrogen entering the installation space 23 can form a nitrogen gas seal isolation between the lifting flange 21 and the supporting rod 222, so as to effectively avoid leakage of medium inside the tank 200 from the lifting device 20 and the electrical feedthrough device 10, prevent safety accidents caused by contact of the medium with the atmosphere, and improve the overall safety of the cryogenic tank 1000.

While the application has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (15)

1. An electrical feedthrough device, comprising:

the feed-through body comprises a first feed-through body and a second feed-through body which are in butt joint, and an isolation cavity is formed between the first feed-through body and the second feed-through body; the first feedthrough body is provided with a first channel penetrating through the first feedthrough body, the second feedthrough body is provided with a second channel penetrating through the second feedthrough body, and the first channel and the second channel are opposite and are communicated with the isolation cavity; the feed-through body is provided with an air inlet communicated with the isolation cavity, and the air inlet is used for introducing nitrogen so as to form nitrogen gas seal isolation between the first channel and the second channel;

the feed-through wire penetrates through the first channel, the isolation cavity and the second channel; one end of the feed-through wire is used for being communicated with the immersed pump, and the other end of the feed-through wire is used for being communicated with a power supply;

the sealing assembly comprises a first sealing sheet and a second sealing sheet, wherein the first sealing sheet and the second sealing sheet are annularly arranged outside the feed-through wire, the first sealing sheet is arranged between the inner wall of the first feed-through body and the outer wall of the feed-through wire, and the second sealing sheet is arranged between the inner wall of the second feed-through body and the outer wall of the feed-through wire.

2. The electrical feed-through of claim 1, wherein a side of the first feed-through facing the second feed-through is recessed with a groove, the groove in communication with the first channel, the first feed-through interfacing with the second feed-through, the groove constituting the isolation cavity; the air inlet is formed in the side wall of the groove of the first feed-through body.

3. The electrical feedthrough of claim 1, wherein the feedthrough body further comprises an air outlet, the air outlet in communication with the isolation cavity; when the nitrogen is introduced into the air inlet, the air outlet is in a blocking state.

4. The electrical feed-through of claim 1, further comprising a quick connect fitting disposed at the gas inlet for communication with a nitrogen supply line.

5. The electrical feed-through of claim 1, further comprising a first flange and a second flange, the first flange disposed on a side of the first feed-through facing away from the second feed-through, the second flange disposed on a side of the second feed-through facing away from the first feed-through; the first flange is butted with the second flange, so that the first feedthrough body is butted with the second feedthrough body; the feed-through wire penetrates through the first flange and the second flange.

6. The electrical feed-through of claim 5, wherein the seal assembly further comprises a first seal ring, a second seal ring, and a third seal ring; the first sealing ring is arranged between the first feed-through body and the second feed-through body and is annularly arranged on the periphery of the isolation cavity; the second sealing ring is arranged between the first feed-through body and the first flange and is annularly arranged on the periphery of the first channel; the third sealing ring is arranged between the second feed-through body and the second flange, and is annularly arranged on the periphery of the second channel.

7. A lifting device, comprising:

the hoisting flange is arranged on the pump well, and the inside of the hoisting flange is communicated with the inside of the pump well;

the hoisting assembly comprises a hoisting member and a supporting rod connected with the hoisting member, the supporting rod penetrates through the hoisting flange and the pump well, and one end of the supporting rod, which is away from the hoisting member, is used for being connected with a immersed pump in the pump well so that the immersed pump ascends or descends under the action of the hoisting member;

an installation space is formed between the inner wall of the hoisting flange and the supporting rod, the installation space is filled with sealing filler, and the sealing filler is annularly arranged on the periphery of the supporting rod and attached to the inner wall of the hoisting flange; the lifting flange is provided with a gas channel communicated with the installation space, and the gas channel is used for introducing nitrogen so as to form nitrogen gas seal isolation between the lifting flange and the supporting rod.

8. The lifting device of claim 7, wherein the lifting flange comprises a flange body and a boss portion, the flange body being hollow inside; the boss part is annular and is convexly arranged on the inner wall of the flange main body, the supporting rod penetrates through the boss part, the installation space is formed between the inner wall of the flange main body and the supporting rod, and the bottom end of the sealing filler is abutted to the boss part.

9. The lifting device according to claim 8, wherein the lifting flange further comprises a top cover, the top cover comprises a cover main body and a connecting portion, the cover main body is hollow, the connecting portion is convexly arranged on the periphery of the top end of the cover main body, and the connecting portion is connected with the top of the flange main body so that the top cover is fixed on the top of the lifting flange; the support rod penetrates through the cover main body, and the bottom end of the cover main body is abutted to the top end of the sealing filler.

10. The lifting device of claim 7, further comprising a protective cover secured to a top of the lifting flange, the lifting member being located inside the protective cover.

11. A submersible pump system, comprising:

the pump well is used for being connected in the tank body, the top of the pump well extends out of the tank body,

a submersible pump disposed in the pump well and disposed at the bottom of the pump well;

the electrical feedthru device of any one of claims 1-6, said electrical feedthru device being disposed atop said pump well, one end of a feedthru lead of said electrical feedthru device being in communication with said submersible pump via an interior of said pump well, and the other end of said feedthru lead being in communication with a power source;

the hoisting device according to any one of claims 7-10, wherein the hoisting device is arranged at the top of the pump well, a supporting rod of the hoisting device is arranged in the pump well in a penetrating way, and the bottom end of the supporting rod is connected with the immersed pump.

12. The immersed pump system of claim 11, further comprising an inflation line comprising an inflation main and first and second inflation branches in communication with an outlet of the inflation main; the inlet of the main inflation pipe is communicated with a nitrogen source, the outlet of the first inflation branch pipe is communicated with the air inlet of the feed-through body, and the outlet of the second inflation branch pipe is communicated with the gas channel of the lifting flange.

13. The immersed pump system of claim 12, wherein a first pressure transmitter is provided on said first inflation manifold, said first pressure transmitter being configured to acquire and transmit a gas pressure value signal in said first inflation manifold; the second inflation branch pipe is provided with a second pressure transmitter, and the second pressure transmitter is used for acquiring and transmitting a gas pressure value signal in the second inflation branch pipe.

14. The immersed pump system of claim 12, wherein a first stop valve and a first check valve are provided on said first inflation manifold and a second stop valve and a second check valve are provided on said second inflation manifold.

15. A cryogenic storage tank comprising a tank body and the immersed pump system of any one of claims 11-14, the pump well being connected in the tank body, the top of the pump well being located outside the tank body; the immersed pump is communicated with the inlet of the liquid outlet pipe, and the outlet end of the liquid outlet pipe is communicated with the outside of the tank body from the top of the pump well through the inside of the pump well.