CN118213805A - Cable penetrating device for low-temperature environment and manufacturing method thereof - Google Patents
Cable penetrating device for low-temperature environment and manufacturing method thereof Download PDFInfo
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- CN118213805A CN118213805A CN202410321427.5A CN202410321427A CN118213805A CN 118213805 A CN118213805 A CN 118213805A CN 202410321427 A CN202410321427 A CN 202410321427A CN 118213805 A CN118213805 A CN 118213805A
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Abstract
The invention discloses a cable penetrating device for a low-temperature environment and a manufacturing method thereof, comprising a flange and a flange cover which are detachably connected, wherein a sealing ring is arranged between the flange and the flange cover, an inner conductor which is transited by adopting a sealing material is arranged on the flange, an outer conductor which is transited by adopting the sealing material is arranged on the flange cover, and the inner conductor is connected with the outer conductor through a connector; and the adjacent ends of the outer side conductor and the inner side conductor are respectively provided with an insulating adhesive layer formed by sealing materials, and the insulating adhesive layers are in contact with the inner sides of the sealing materials. Two serially connected sealing structures (namely a first sealing conductor and a second sealing conductor) are arranged in the axial direction, and a double-channel sealing barrier is arranged, so that substances inside the shell can be effectively prevented from leaking.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to a cable penetration device for a low-temperature environment and a manufacturing method thereof.
Background
The cable penetrating device for the low-temperature environment is used as a key component of a low-temperature pump, is applied to the low-temperature flammable and explosive gas environment, has four functional characteristics of pressure boundary integrity, sealing reliability, excellent electrical performance and low-temperature tolerance, has the characteristics of leakage monitoring function, explosion prevention and the like, and plays a very important role in the safety of equipment and facilities such as a natural gas liquefaction plant, a peak shaving station, a chemical plant, a floating storage regasification device, an offshore liquefied natural gas transport ship, liquid hydrogen transportation and the like. However, the existing cable penetration device needs to be further improved in pressure bearing and sealing performance.
Disclosure of Invention
The invention aims to solve the technical problem that the pressure-bearing and sealing performance of the traditional cable penetrating device is still to be further improved. The cable penetrating device for the low-temperature environment has good pressure bearing and sealing performance, and can effectively prevent the leakage of flammable and explosive gases under high pressure.
The invention is realized by the following technical scheme:
the invention discloses a cable penetrating device for a low-temperature environment, which comprises a flange and a flange cover which are detachably connected, wherein a sealing ring is arranged between the flange and the flange cover, an inner conductor which is in transition by adopting a sealing material is arranged on the flange, an outer conductor which is in transition by adopting the sealing material is arranged on the flange cover, and the inner conductor is connected with the outer conductor through a connector; and the adjacent ends of the outer side conductor and the inner side conductor are respectively provided with an insulating adhesive layer formed by sealing materials, and the insulating adhesive layers are in contact with the inner sides of the sealing materials.
As one possible design, the outside conductor and the inside conductor are both covered with insulating blocks, an insulating pressing plate is arranged outside the insulating blocks, and the insulating pressing plate is detachably connected with the insulating blocks and the insulating adhesive layer.
As one possible design, the inner conductor and the outer conductor are wires made of iron-nickel alloy with a thermal expansion coefficient substantially consistent with that of glass/ceramic or the outer cladding material is iron-nickel alloy, and the flange cover are alloy materials with a thermal expansion coefficient greater than or equal to that of glass/ceramic and iron-nickel alloy.
As one possible design, a counter bore is provided at an end of the flange cover facing the flange, an insulating member is provided in the counter bore, and the outer conductor and the inner conductor penetrate through the insulating member.
As one possible design, the connector is provided in the insulating member.
As a possible design, the end of the insulating block remote from the flange or flange cover is provided with an end fitting. .
As a possible design, the outer conductor and the flange are integrally formed, and the inner conductor and the flange cover are integrally formed.
As one possible design, the outer conductor and the flange are sintered into a whole by adopting a glass-metal or ceramic-metal sealing process after being assembled; and after the inner conductor and the flange cover are assembled, sintering the inner conductor and the flange cover into a whole by adopting a glass-metal or ceramic-metal sealing process.
As one possible design, the side surface of the flange cover is also provided with a through hole for internal and external communication, and one end of the through hole is a pipeline interface;
The cable penetrating device further comprises an inner protective box and an outer protective box, one end of the inner protective box is connected with the flange, and one end of the outer protective box is connected with the flange cover; preferably, the insulating glue layer, the insulating block, the insulating pressing plate and the insulating part are all made of polysulfone, epoxy resin, polytetrafluoroethylene, tetrafluoroethylene, polytetrafluoroethylene, soluble polytetrafluoroethylene, fluorinated ethylene propylene copolymer, silicone rubber or polyether ether ketone.
The second object of the present invention is to disclose a method for manufacturing the cable penetration device for low temperature environment, comprising:
adopting iron-nickel alloy or copper-clad iron-nickel alloy to manufacture an inner conductor and an outer conductor;
the inner conductor, the outer conductor and the sealing material are respectively assembled into a whole with the flange and the flange cover, and are sintered at high temperature and then subjected to surface treatment to obtain a first sealing conductor and a second sealing conductor;
connecting the first sealing conductor and the second sealing conductor by using a connector, and fixing the connector and electrically insulating an inner space by using an insulating part;
Placing the insulating member within the counterbore of the flange cover with a fastener;
The flange and the flange cover are sealed by a sealing ring and are connected by a fastener, and the inner space forms an air cavity;
the insulating block is pressed on the surface of the sealing material by the pressing plate;
and installing an inner protection box and an outer protection box.
The beneficial effects of the invention are as follows:
1. The problem that the cable penetrates through the shell under high-pressure and low-temperature environment conditions to provide power or signal transmission for electric equipment such as an inner side low-temperature pump is solved.
2. The sealing between the inner conductor and the outer conductor and the flange or the flange cover is realized by adopting an inorganic-metal sealing process, so that the problem of ageing and invalidation of sealing materials is avoided, and the reliability and the safety of the equipment under high pressure conditions for a long time are ensured.
3. The cable penetrating device for the low-temperature environment is provided with two serially connected sealing structures (namely the two first sealing conductors and the two second sealing conductors) in the axial direction, and is provided with a double-channel sealing barrier, so that substances inside the shell can be effectively prevented from leaking.
4. The cable penetrating device is connected with the outside casing or the reserved hole of the pipeline, and the reserved hole can be connected with temperature or pressure and other measuring equipment to monitor internal temperature or pressure and other operating parameters, so that continuous monitoring of multiple sealing parts (such as flange and flange cover sealing and conductor hole sealing) can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic view of a cable penetrating device for a low-temperature environment according to an embodiment of the present invention.
In the drawings, the reference numerals and corresponding part names:
The device comprises a 101-inner protective box, a 102-outer protective box, a 2-end connector, a 301-inner conductor, a 302-outer conductor, a 4-pressing plate, a 5-insulating block, a 6-sealing material, a 7-flange, 8-fasteners, 9-sealing rings, 10-insulating parts, 11-connectors and 12-flange covers.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
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 such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention 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 operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The cable penetrating device for the low-temperature environment is used as a key component of a low-temperature pump and is applied to a low-temperature flammable and explosive gas environment. The problem that the pressure bearing and sealing performance of the existing cable penetration device are still to be further improved at present is that the embodiment of the invention provides the cable penetration device for the low-temperature environment.
As shown in fig. 1, the embodiment of the invention discloses a cable penetrating device for a low-temperature environment, which comprises a flange 7 and a flange cover 12 which are detachably connected, wherein an inner conductor 301 which is transited by a sealing material 6 is arranged on the flange 7, an outer conductor 302 which is transited by the sealing material 6 is arranged on the flange cover 12, and the outer conductor 302 and the inner conductor 301 are connected through a connector 11; the sealing material 6 plays a transitional connection role between the flange 7 and the inner conductor 301 and between the flange cover 12 and the outer conductor 302, and plays roles of bearing, sealing and insulation.
The adjacent ends of the outer conductor 302 and the inner conductor 301 are provided with an insulating glue layer formed by sealing materials, the insulating glue layer is contacted and arranged on the inner side of the sealing material 6, the inner side refers to the side close to the cavity, the cavity refers to a gap area formed by the flange 7 and the flange cover 12, the inner side in other places in the invention refers to the left side in fig. 1, and the outer side refers to the right side in fig. 1.
And a certain pressure gas is filled in the cavity between the flange 7 and the flange cover 12, so that the leakage rate of the cable penetrating device can be monitored according to the change of the gas pressure. The inner conductor 301 and the outer conductor 302 are made of metal or alloy, for example: iron-nickel alloys, copper clad iron-nickel alloys, and the like. The thermal expansion coefficients of the inner conductor 301 and the outer conductor 302 are basically consistent with those of the sealing material for sintering, so that the whole obtained after the later encapsulation has good pressure bearing and sealing performance.
The flange 7 and the flange cover 12 are made of carbon steel, stainless steel, titanium alloy or other metal materials with a thermal expansion coefficient not lower than that of the sealing material and the iron-nickel alloy. After sintering, the outer surfaces of the inner conductor 301 and the outer conductor 302 are subjected to a nickel, gold plating or the like treatment to enhance wear resistance and conductivity.
The sealing material 6 and the insulating adhesive layer are mainly suitable for insulation and sealing, wherein the sealing material 6 is made of inorganic materials such as glass, ceramic and the like, and the insulating adhesive layer is made of rubber materials, for example: polysulfone, epoxy, polytetrafluoroethylene, silicone rubber or polyetheretherketone, and the like.
As shown in fig. 1, the outer side conductor 302 and the outer side conductor 301 are both coated with an insulating block 5, the insulating block 5 is coated with an insulating pressing plate 4, and the insulating pressing plate 4 is detachably connected with the insulating block 5 and the insulating adhesive layer. The insulating pressing plate 4 is used for pressing the insulating pressing plate 4 and completely exhausting air of a conductor sealing pore canal, so that insulation continuity of the whole length of the conductor is ensured, the creepage distance is enhanced, and the voltage withstand requirement of the whole machine is ensured. The cladding is understood herein to mean that the inner wall of the insulating block 5 is in close contact with the outer wall of the outer conductor 302 and the outer wall of the inner conductor 301, with no gap therebetween.
As shown in fig. 1, a counter bore is formed in an end of the flange cover 12 facing the flange 7, an insulating member 10 is disposed in the counter bore, and the outer conductor 302 and the inner conductor 301 penetrate through the insulating member 10. The insulating member 10 is mainly used for fixing the connector 11 and the connection of the connector 11 with the inner conductor 301 and the outer conductor 302, and ensures the insulating effect.
The insulating block 5 and the insulating part 10 can be high-temperature resistant and low-temperature resistant polysulfone, polyether-ether-ketone, silicone rubber, tetrafluoroethylene, polytetrafluoroethylene, soluble polytetrafluoroethylene, fluorinated ethylene propylene copolymer or epoxy resin and other high-molecular polymers.
As shown in fig. 1, the connector 11 is provided in the insulating member 10. The specific connection mode of the connector 11 and the inner side conductor 301 and the outer side conductor 302 can be crimping or splicing, so that the electrical continuity of the whole conductor is ensured.
As shown in fig. 1, the insulating block 5 is provided with an end fitting 2 at an end remote from the flange 7 or flange cover 12. The terminal 2 is used for connecting an external cable, and the specific connection mode of the terminal 2 and the external cable can be one of crimping, plugging, welding and bolt fastening connection.
As shown in fig. 1, a sealing ring 9 is further disposed between the flange 7 and the flange cover 12, so as to seal the cavity and avoid leakage of gas. The second sealing ring 9 may be a rubber ring or a metal ring.
The outer conductor 302, the inner conductor 301, the sealing material 6, the insulating glue layer, the flange 7 and the flange cover 12 are integrally assembled and molded, so that the tightness is further improved, and the leakage of gas is reduced. After the outer conductor 302, the sealing material 6 and the flange cover 12 are assembled, the outer conductor 301, the sealing material 6 and the flange cover 12 may be formed as a whole by sintering, and the manufacturing methods thereof are the same, and will not be described here. In particular, a glass-metal or ceramic-metal sealing process can be adopted, and the glass/ceramic is an inorganic material and is not easily affected by aging in an oxygen-containing environment, so that the glass/ceramic can be used in a high-pressure and low-temperature environment for a long time.
The side surface of the flange cover 12 is also provided with a through hole (not shown in the figure) for communicating the inside and the outside, and one end of the through hole is a pipeline interface. The pipeline interface is used for connecting an external pipeline, can be used for filling gas with certain pressure into the cavity, and can monitor the integral leakage rate of the sintering structure and the sealing ring. Internal and external communication herein refers to external and cavity communication.
The cable penetration device further comprises an inner protective box 101 and an outer protective box 102, wherein one end of the inner protective box 101 is connected with the flange 7, and one end of the outer protective box 102 is connected with the flange cover 12. The inner protective case 101 and the outer protective case 102 cover the other parts except the flange 7 or the flange 7 plate on the side where the inner protective case is located, isolate dust, impurities and the like in the environment, protect the insulator, the pressing plate 4, the conductor and the like inside, and connect the conductor end with the external cable inside the protective case.
In actual use, the cable penetrating device for low temperature environment is connected with the reserved pore canal on the external shell or pipeline, and can be connected with the corresponding monitoring device of the external pressure, temperature and other indexes through the penetrating hole on the flange cover 12, so as to monitor the condition inside the cavity.
As shown in fig. 1, a termination 2 may be provided on the outside of the outer conductor 302 and on the end of the inner conductor 301 not connected to the connector 11 for connection to an external cable, the termination 2 preferably being provided in the inner and outer protective cases 101 and 102.
As shown in fig. 1, the insulating member 10 and the flange cover 12 may be connected by a bolt. The fastening means 8 between the flange 7 and the flange cover 12 are connected, and the fastening means 8 may be a screw connection.
In the present invention, the end fitting 2 is a component which is conventional in the art and is not described in detail herein.
In the invention, the pressing plate 4 can be fixed at the end parts of the flange 7 and the flange cover 12 by bolts and is used for pressing the insulating block 5, increasing the creepage distance of the outer surface of the conductor and ensuring the electrical performance of the equipment.
In the present invention, the flange 7 and the flange cover 12 are made of high-strength carbon steel or stainless steel, and the surfaces thereof are subjected to plating, rust prevention, and the like.
The seal ring 9 is a seal commonly used in the art, for example: o-ring, V-ring, C-ring, etc.
The embodiment of the invention also discloses a manufacturing method of the cable penetration device for the low-temperature environment, which comprises the following steps:
S1, placing an insulating part 10 in a counter bore and fixing the insulating part 10; firstly, preprocessing an inner conductor 301, an outer conductor 302, a flange 7 and a flange cover 12, then assembling the inner conductor 301, a sealing material 6 and the flange 7 together, assembling the outer conductor 302, the sealing material 6 and the flange cover 12 together, respectively performing high-temperature sintering, wherein the sintering maximum temperature is generally within the range of 900-1200 ℃, and the sintering environment is a reducing gas or inert gas protection atmosphere;
after sintering, carrying out surface treatment, wherein the specific steps are as follows: firstly removing an oxide layer on the surface of the metal, and then electroplating and cleaning to obtain a first sealed conductor and a second sealed conductor.
S2, the opposite ends of the inner conductor 301 and the outer conductor 302 are connected by the connector 11, and the insulation member 10 is used for fixing the connector 11 and electrically insulating the inner space. The connector 11 is a common component in the art and is not described in detail herein.
S3, a sealing ring 9 is arranged between the flange 7 and the flange cover 12 and is connected through a fastener 8, an air cavity is formed in the inner space, and after gas with certain pressure is filled, the integral leakage rate of the sealing conductor I, the sealing conductor II and the sealing ring can be monitored.
S4, the insulating block is pressed on the surface of the sealing material by a pressing plate;
S5, the inner protection box 101 and the outer protection box 102 are installed, and a detachable connection mode is generally adopted, so that maintenance and replacement of internal parts are facilitated.
The embodiment of the invention has the beneficial effects that:
1. The problem that the cable penetrates through the shell under high-pressure and low-temperature environment conditions to provide power or signal transmission for electric equipment such as an inner side low-temperature pump is solved.
2. The sealing between the inner conductor and the outer conductor and the flange or the flange cover is realized by adopting an inorganic-metal sealing process, so that the problem of ageing and invalidation of sealing materials is avoided, and the reliability and the safety of the equipment under high pressure conditions for a long time are ensured.
3. The cable penetrating device for the low-temperature environment is provided with two serially connected sealing structures (namely the first sealing conductor and the second sealing conductor) in the axial direction, and is provided with a double-channel sealing barrier, so that substances inside the shell can be effectively prevented from leaking.
4. The cable penetrating device is connected with the outside casing and/or the reserved hole of the pipeline, and the through hole on the flange cover can be connected with temperature or pressure measuring equipment to monitor internal temperature or pressure and other operating parameters, so that continuous monitoring of a plurality of sealing parts (such as flange and flange cover sealing and conductor duct sealing) can be realized.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The cable penetrating device for the low-temperature environment comprises a flange and a flange cover which are detachably connected, and is characterized in that a sealing ring is arranged between the flange and the flange cover, an inner conductor which is in transition by adopting a sealing material is arranged on the flange, an outer conductor which is in transition by adopting the sealing material is arranged on the flange cover, and the inner conductor and the outer conductor are connected through a connector; and the adjacent ends of the outer side conductor and the inner side conductor are respectively provided with an insulating adhesive layer formed by sealing materials, and the insulating adhesive layers are in contact with the inner sides of the sealing materials.
2. The cable penetration device for a low-temperature environment according to claim 1, wherein the outer conductor and the inner conductor are both coated with insulating blocks, an insulating pressing plate is arranged outside the insulating blocks, and the insulating pressing plate is detachably connected with the insulating blocks and the insulating adhesive layer.
3. The cable penetration device for a low temperature environment according to claim 2, wherein the inner conductor and the outer conductor are wires made of an iron-nickel alloy having a thermal expansion coefficient substantially identical to that of glass/ceramics or an outer cladding material is an iron-nickel alloy), and the flange cover are alloy materials having a thermal expansion coefficient greater than or equal to that of glass/ceramics and iron-nickel alloy.
4. The cable penetration device for a low-temperature environment according to claim 1, wherein a counter bore is provided at an end of the flange cover facing the flange, an insulating member is provided in the counter bore, and the outer conductor and the inner conductor penetrate the insulating member.
5. The cable penetration device for a low-temperature environment according to claim 4, wherein the connector is provided in the insulating member.
6. The cable penetration device for a low temperature environment according to claim 1, wherein an end of the insulating block away from the flange or the flange cover is provided with a terminal. .
7. The cable penetration device for a low-temperature environment according to claim 1, wherein the outer conductor and the flange are integrally formed, and the inner conductor and the flange cover are integrally formed.
8. The cable penetration device for low temperature environment according to claim 7, wherein after the outer conductor and the flange are assembled, the outer conductor and the flange are sintered into a whole by adopting a glass-metal or ceramic-metal sealing process; and after the inner conductor and the flange cover are assembled, sintering the inner conductor and the flange cover into a whole by adopting a glass-metal or ceramic-metal sealing process.
9. The cable penetration device for the low-temperature environment according to claim 1, wherein the side surface of the flange cover is further provided with a penetration hole for internal and external communication, and one end of the penetration hole is a pipeline interface;
The cable penetrating device further comprises an inner protective box and an outer protective box, one end of the inner protective box is connected with the flange, and one end of the outer protective box is connected with the flange cover; preferably, the insulating glue layer, the insulating block, the insulating pressing plate and the insulating part are all made of polysulfone, epoxy resin, polytetrafluoroethylene, tetrafluoroethylene, polytetrafluoroethylene, soluble polytetrafluoroethylene, fluorinated ethylene propylene copolymer, silicone rubber or polyether ether ketone.
10. A method of manufacturing a cable penetration device for a low temperature environment according to any one of claims 1 to 9, the method comprising:
adopting iron-nickel alloy or copper-clad iron-nickel alloy to manufacture an inner conductor and an outer conductor;
the inner conductor, the outer conductor and the sealing material are respectively assembled into a whole with the flange and the flange cover, and are sintered at high temperature and then subjected to surface treatment to obtain a first sealing conductor and a second sealing conductor;
connecting the first sealing conductor and the second sealing conductor by using a connector, and fixing the connector and electrically insulating an inner space by using an insulating part;
Placing the insulating member within the counterbore of the flange cover with a fastener;
The flange and the flange cover are sealed by a sealing ring and are connected by a fastener, and the inner space forms an air cavity;
the insulating block is pressed on the surface of the sealing material by the pressing plate;
and installing an inner protection box and an outer protection box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410321427.5A CN118213805A (en) | 2024-03-20 | 2024-03-20 | Cable penetrating device for low-temperature environment and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410321427.5A CN118213805A (en) | 2024-03-20 | 2024-03-20 | Cable penetrating device for low-temperature environment and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN118213805A true CN118213805A (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410321427.5A Pending CN118213805A (en) | 2024-03-20 | 2024-03-20 | Cable penetrating device for low-temperature environment and manufacturing method thereof |
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| Country | Link |
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| CN (1) | CN118213805A (en) |
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