CN111403099B

CN111403099B - Leakage coaxial cable

Info

Publication number: CN111403099B
Application number: CN202010207549.3A
Authority: CN
Inventors: 黄晓鹏; 华瑶; 陈涛
Original assignee: Hangzhou Futong Electric Wire & Cable Co ltd
Current assignee: Hangzhou Futong Electric Wire & Cable Co ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2021-11-09
Anticipated expiration: 2040-03-23
Also published as: CN111403099A

Abstract

The invention belongs to the technical field of cables, in particular to a leaky coaxial cable which comprises a leaky section and closed sections positioned at two ends of the leaky section, wherein the whole cable comprises a protective layer, an outer heat conducting layer, an outer conductor, an inner heat conducting layer and an inner conductor from outside to inside, and a notch is formed in the side wall of the outer conductor of the leaky section; the inner wall of the outer heat conduction layer is tightly attached to the outer conductor, the inner wall of the inner heat conduction layer is tightly attached to the inner conductor, the outer heat conduction layer and the inner heat conduction layer have a supporting effect, and the basic structure of the heat conduction layer is made of chlorosulfonated polyethylene. The periphery of the inner conductor of the cable is directly contacted with the inner heat conducting layer, and the heat generated by the inner conductor is directly absorbed by the inner heat conducting layer under the cable load state, so that the heat accumulation of the inner conductor is avoided, and the inner conductor is ensured to be in a proper working environment; the periphery of the outer conductor is directly contacted with the outer heat conduction layer, heat generated by the outer conductor can be rapidly transmitted to the outer heat conduction layer, and the inner heat conduction layer and the outer heat conduction layer act together to ensure that the inside of the cable cannot influence the normal use of the cable due to heat accumulation.

Description

Leakage coaxial cable

Technical Field

The invention belongs to the technical field of cables, and particularly relates to a leaky coaxial cable.

Background

The leaky coaxial cable is a wave guide mechanism which is used for replacing an antenna in a mobile communication system to improve the electromagnetic wave field intensity in a specific area, and in practical use, the leaky coaxial cable is widely applied to special areas such as underground tunnels, mines and the like. The leaky cable can generate heat in use, the temperature of the leaky cable can be influenced by the ambient temperature, the service life of the leaky cable can be influenced by the overhigh temperature, or the problem directly occurs in the use process. The leaky cable used in some special environments is likely to fail due to over-high temperature, and therefore, the heat resistance of the leaky cable needs to be studied deeply.

Disclosure of Invention

The invention aims to provide a leaky coaxial cable which can conduct heat generated by an inner conductor and an outer conductor in time and simultaneously prevent the temperature of the external environment from entering the inside of the cable, thereby improving the heat resistance of the leaky cable.

In order to achieve the purpose, the invention provides the following technical scheme: a leaky coaxial cable comprises a leaky section and closed sections positioned at two ends of the leaky section, wherein the whole cable comprises a protective layer, an outer heat conducting layer, an outer conductor, an inner heat conducting layer and an inner conductor from outside to inside, a notch is formed in the side wall of the outer conductor of the leaky section, and the side wall of the outer conductor of the closed section is complete; the inner wall of the outer heat conduction layer is tightly attached to the outer conductor, the inner wall of the inner heat conduction layer is tightly attached to the inner conductor, the outer heat conduction layer and the inner heat conduction layer have a supporting effect, and the basic structure of the heat conduction layer is made of chlorosulfonated polyethylene.

In the technical scheme, the periphery of the inner conductor of the cable is directly contacted with the inner heat conducting layer, and heat generated by the inner conductor is directly absorbed by the inner heat conducting layer in a cable load state, so that the heat accumulation of the inner conductor is avoided, and the inner conductor is ensured to be in a proper working environment; the periphery of the outer conductor is directly contacted with the outer heat conduction layer, the generated heat can be quickly transferred to the outer heat conduction layer, and the inner heat conduction layer and the outer heat conduction layer act together to ensure that the normal use of the cable cannot be influenced due to heat accumulation in the cable; meanwhile, the outer heat conduction layer also plays a role in blocking the ambient temperature, and the heat partially penetrating through the protective layer and entering the cable can be absorbed by the outer heat conduction layer, so that the influence of the ambient temperature on the outer conductor is avoided.

Preferably, a reflecting layer is arranged between the protective layer and the outer heat conducting layer, the heat passing through the protective layer can be greatly reflected by the increased reflecting layer, most of the entering heat is stopped at the protective layer, so that the heat conducting effect of the outer heat conducting layer on the outer conductor can be more kept, the heat resistance of the cable is increased, and the influence of the external temperature on the cable is reduced.

Preferably, an inner cladding layer is wrapped outside the inner heat conducting layer, the inner cladding layer plays a role in heat insulation and buffering, and the outer conductor is wrapped on the inner cladding layer. The outer heat conducting layer and the inner heat conducting layer respectively have specific functions, and the inner heat conducting layer is used for isolating the outer heat conducting layer and the inner heat conducting layer, so that the respective heat absorption performance can be prevented from being decomposed, and the heat conducting performance of the outer conductor and the inner conductor can be kept to the maximum extent. Simultaneously, the inner cladding can play the effect of buffer pressure for the cable has appropriate deformability, avoids the rigidity striking to lead to the cracked phenomenon of cable.

Preferably, the inner heat conduction layer is tubular, a plurality of through holes are formed in the wall of the inner heat conduction layer along the axial direction, heat conduction agents are filled in the through holes, and the inner conductor is cooled through the heat conduction agents filled in the inner heat conduction layer.

Preferably, the through holes on the pipe wall of the inner heat conduction layer are annularly arranged and at least comprise two rings of through holes, and the through holes of adjacent rings are arranged in a staggered manner, so that the arrangement mode can ensure that the aperture of the through holes is not too small, can ensure that the heat conducting agent and the inner conductor have the largest dead against area, and avoids uneven heat transfer of all parts of the heat conducting agent. Especially, under the condition that the heat conducting agent is provided with the three-ring through holes, the cross section of the through holes of the first two rings is circular, the three-ring through holes are arranged in a staggered mode, the side walls of the outer ring through holes extend into the space enclosed by the middle ring and the inner ring through holes, the heat conducting agent of the first two rings can quickly and uniformly absorb the heat of the inner conductor, the third ring absorbs the heat of the first two rings, and therefore the heat is uniformly dispersed in the heat conducting agent, and the problem that the heat conducting efficiency of the inner heat conducting layer is reduced due to nonuniform heat absorption of the heat conducting agent is avoided.

Preferably, the outer heat conduction layer is tubular, a plurality of through holes along the axial direction are arranged on the tube wall in a penetrating mode, the through holes are filled with heat conduction agents, and the outer conductor is cooled through the heat conduction agents filled inside the outer heat conduction layer.

As a further improvement of the outer heat conduction layer, the heat conduction agent filled in the through hole of the outer heat conduction layer is a liquid heat conduction agent, and an outer circulation end cover and an inner circulation end cover are respectively arranged at two ends of the outer heat conduction layer; the inner circulation end cover is provided with flow guide pipes II which are in one-to-one correspondence with the through holes, a communicating cavity is arranged in the inner circulation end cover, the flow guide pipes II are connected with the communicating cavity, and the inner circulation end cover covers one end of the outer heat conduction layer so that the through holes of the outer heat conduction layer are communicated at the end; the external circulation end cover comprises an annular communicating vessel, an output cavity and an input cavity which are integrally combined in an annular shape are arranged in the communicating vessel, and the output cavity and the input cavity are separated by a partition plate; the communicating vessel is provided with a plurality of flow guide pipes I which correspond to the through holes one by one, and the flow guide pipes I are divided into two groups and communicated with the output cavity and the input cavity; two circulating pump joints which are respectively communicated with the output cavity and the input cavity are arranged on the communicating vessel, and the circulating pump joints are used for connecting an external circulating cooling device. Because outer heat-conducting layer has the heat of inside absorption outer conductor, the dual function of the temperature of outside separation external environment, therefore outer heat-conducting layer has important effect to the high temperature resistance ability of whole cable, through outer circulation end cover and inner loop end cover with the through-hole intercommunication of outer heat-conducting layer to assisting external circulation heat sink, can make the interior flow state heat-conducting agent of outer heat-conducting layer have periodic cooling process, thereby guarantee that outer heat-conducting layer keeps good heat conductivility all the time.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a sectional view showing a leaking section of a cable according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure of a cable according to an embodiment of the present invention.

Fig. 3 is a schematic view of a split structure of a circulating end of a cable according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of an outer circulation end cap of a cable end in an embodiment of the present invention.

Fig. 5 is a sectional view of the end cap of fig. 4.

Fig. 6 is a sectional view of the internal circulation end cap of the cable end in the embodiment of the invention.

In the figure, a leakage section 1, a closing section 2, a protective layer 3, a reflecting layer 4, an outer heat conducting layer 5, an outer conductor 6, an inner cladding 7, an inner heat conducting layer 8, an inner conductor 9, a notch 1O, an outer circulation end cover 11, an inner circulation end cover 12, a plugging plug 13, a communicating vessel 110, a flow guide pipe I111, a circulating pump joint 112, an output cavity 113, an input cavity 114, a partition plate 115, a flow guide pipe II121 and a communicating cavity 122.

Detailed Description

Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

Fig. 1-6 illustrate a leaky coaxial cable according to an embodiment of the present invention. The leaky cable is suitable for occasions such as short-distance tunnels and mines and comprises a leaky section 1 and closed sections 2 positioned at two ends of the leaky section 1, the whole cable comprises a protective layer 3, an outer heat conducting layer 5, an outer conductor 6, an inner heat conducting layer 8 and an inner conductor 9 from outside to inside, the inner conductor and the outer conductor are copper tubes, and the inner conductor can also be a copper-plated aluminum bar. Notches 10 which are periodically distributed along the axial direction and the circumferential direction are formed in the side wall of the outer conductor 6 of the leakage section 1, and the side wall of the outer conductor 6 of the closed section 2 is complete; the inner wall of the outer heat conduction layer 5 is tightly attached to the outer conductor 6, the inner wall of the inner heat conduction layer 8 is tightly attached to the inner conductor 9, the outer heat conduction layer 5 and the inner heat conduction layer 8 are both in a tubular shape, the heat conduction function and the supporting function are achieved, and the basic structure of the heat conduction layer is made of chlorosulfonated polyethylene.

Specifically, the tube wall of the inner heat conduction layer 8 is provided with a plurality of through holes along the axial direction, both ends of the through holes are sealed by the sealing plugs 13, the through holes are filled with a heat conduction agent, such as heat conduction silicone grease, and the inner heat conduction layer 8 cools the inner conductor 9 through the heat conduction agent filled inside. In an embodiment, the through holes on the tube wall of the inner heat conducting layer 8 are annularly arranged and have three-ring through holes, wherein the cross sections of the through holes of the first two rings are circular, and the three-ring through holes are arranged in a staggered manner, wherein the side walls of the outer ring through holes extend into a space enclosed by the middle ring and the inner ring through holes. The through holes are arranged in a staggered mode, so that the arrangement mode can not only ensure that the aperture of the through holes is not too small, but also ensure that the heat-conducting agent and the inner conductor 9 have the largest dead against area, and avoid uneven heat transfer of all parts of the heat-conducting agent.

In the actual heat conduction process, the inner ring heat-conducting agent firstly absorbs the heat generated by the inner conductor 9, part of the heat is transmitted to the second annular through hole from the position between the two adjacent through holes on the inner ring and is absorbed by the second annular heat-conducting agent, the third annular heat-conducting agent can continue to absorb the heat transmitted outwards through the second annular through hole, and meanwhile, the purpose of secondary transmission of the heat between the heat-conducting agents is achieved by absorbing the heat absorbed by the first two annular heat-conducting agents, so that the heat is uniformly dispersed in the heat-conducting agents.

Preferably, a plurality of through holes are formed in the tube wall of the outer heat conduction layer 5 in the axial direction, liquid heat conduction agents (such as water and liquid nitrogen) are filled in the through holes, and the outer heat conduction layer 5 cools the outer conductor 6 through the heat conduction agents filled inside. This outer heat-conducting layer 5 has the effect of the cooling of outer conductor 6 and separation external environment temperature concurrently, and it has an important role to the high temperature resistance performance of cable, therefore this embodiment sets up the heat-conducting agent in outer heat-conducting layer 5 to the developments, need be assisted with circulation refrigerating plant in the in-service use. Specifically, an outer circulation end cover 11 and an inner circulation end cover 12 are respectively arranged at two ends of the outer heat conduction layer 5; wherein, the inner circulation end cover 12 is provided with a draft tube II121 which is in one-to-one correspondence with the through holes, the inner circulation end cover 12 is internally provided with a communicating cavity 122, the draft tube II121 is connected with the communicating cavity 122, the inner circulation end cover 12 is covered at one end of the outer heat conducting layer 5, so that the through holes of the outer heat conducting layer 5 are communicated at the end; the external circulation end cover 11 comprises an annular communicating vessel 110, an output cavity 113 and an input cavity 114 which are integrally combined in an annular shape are arranged in the communicating vessel 110, and the output cavity 113 and the input cavity 114 are separated by a partition plate 115; a plurality of flow guide pipes I111 which are in one-to-one correspondence with the through holes are arranged on the communicating vessel 110, and the flow guide pipes I111 are divided into two groups and communicated with the output cavity 113 and the input cavity 114; two circulating pump joints 112 respectively communicated with the output cavity 113 and the input cavity 114 are arranged on the communicating vessel 110, and the circulating pump joints 112 are used for connecting an external circulating cooling device. The through holes of the outer heat conduction layer 5 are communicated through the outer circulation end cover 11 and the inner circulation end cover 12, and the flow state heat conduction agent in the outer heat conduction layer 5 can be periodically cooled under the action of the external circulation cooling device, so that the outer heat conduction layer 5 is ensured to always keep good heat conduction performance.

In this embodiment, the periphery of the inner conductor 9 of the cable directly contacts the inner heat conducting layer 8, and in a cable load state, heat generated by the inner conductor is directly absorbed by the inner heat conducting layer, so that the inner conductor 9 is prevented from accumulating heat, and the inner conductor 9 is ensured to be in a proper working environment; the periphery of the outer conductor is directly contacted with the outer heat conduction layer, the generated heat can be rapidly transferred to the outer heat conduction layer 5, and the inner heat conduction layer 8 and the outer heat conduction layer 5 act together to ensure that the normal use of the cable cannot be influenced due to heat accumulation in the cable; meanwhile, the outer heat conducting layer 5 also plays a role in blocking the ambient temperature, and part of heat which penetrates through the protective layer 3 and enters the cable can be absorbed by the outer heat conducting layer 5, so that the ambient temperature is prevented from affecting the outer conductor 6. The fluid heat conducting agent in the outer heat conducting layer 5 can periodically bring the absorbed heat into the circulating cooling device, and the heat returns to the outer heat conducting layer 5 after being cooled, so that the cable can completely resist the high-temperature influence of the external environment.

In addition, a reflecting layer 4 made of aluminum foil is arranged between the protective layer 3 and the outer heat conducting layer 5, the reflecting layer 4 is added, so that heat penetrating through the protective layer 3 can be greatly reflected, most of the penetrating heat can stay in the protective layer 3, the heat conducting effect of the heat conducting layer 5 on the outer conductor 6 can be more kept, the heat resistance of the cable is improved, and the influence of the external temperature on the cable is reduced. An inner cladding 7 which is mainly made of non-woven fabrics (polyethylene can also be used) is wrapped outside the inner heat conduction layer 8, the outer conductor 6 is wrapped on the inner cladding 7, and the inner cladding 7 plays a role in heat insulation and buffering. The outer and inner

heat conducting layers

5 and 8 each have a specific function and their separation by the inner layer 7 prevents their heat sink properties from being degraded, thus maximizing their ability to retain their heat conducting properties to the outer and

inner conductors

6 and 9. Meanwhile, the inner cladding 7 can play a role in buffering pressure, so that the cable has proper deformation performance, and the phenomenon that the cable is broken due to rigid impact is avoided.

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

It is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. The term "comprising", without further limitation, means that the element so defined is not excluded from the article or system in which the element is included.

The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A leaky coaxial cable, comprising: the cable comprises a leakage section and closed sections positioned at two ends of the leakage section, the whole cable comprises a protective layer, an outer heat conduction layer, an outer conductor, an inner heat conduction layer and an inner conductor from outside to inside, wherein a notch is formed in the side wall of the outer conductor of the leakage section, and the side wall of the outer conductor of the closed section is complete; the inner wall of the outer heat conduction layer is tightly attached to the outer conductor, and the inner wall of the inner heat conduction layer is tightly attached to the inner conductor; the outer heat conduction layer is tubular, a plurality of through holes along the axial direction are arranged on the tube wall in a penetrating manner, and a heat conduction agent is filled in the through holes; the heat conducting agent filled in the through hole of the outer heat conducting layer is liquid heat conducting agent, and an outer circulation end cover and an inner circulation end cover are respectively arranged at two ends of the outer heat conducting layer; the inner circulation end cover is provided with flow guide pipes II which correspond to the through holes one by one, a communicating cavity is arranged in the inner circulation end cover, the flow guide pipes II are connected with the communicating cavity, and the inner circulation end cover covers one end of the outer heat conduction layer so that the communicating holes of the outer heat conduction layer are communicated at the end; the external circulation end cover comprises an annular communicating vessel, an output cavity and an input cavity which are integrally combined in an annular shape are arranged in the communicating vessel, and the output cavity and the input cavity are separated by a partition plate; the communicating vessel is provided with a plurality of flow guide pipes I which correspond to the through holes one by one, and the flow guide pipes I are divided into two groups and communicated with the output cavity and the input cavity; two circulating pump joints which are respectively communicated with the output cavity and the input cavity are arranged on the communicating vessel, and the circulating pump joints are used for connecting an external circulating cooling device.

2. The leaky coaxial cable as claimed in claim 1, wherein: and a reflecting layer is arranged between the protective layer and the outer heat conducting layer.

3. The leaky coaxial cable as claimed in claim 1, wherein: the outer heat-conducting layer wraps the inner cladding, and the outer conductor wraps the inner cladding.

4. The leaky coaxial cable as claimed in claim 1, wherein: the inner heat conducting layer is tubular, a plurality of through holes along the axial direction are formed in the pipe wall of the inner heat conducting layer, and heat conducting agents are filled in the through holes.

5. The leaky coaxial cable as claimed in claim 4, wherein: the through holes on the pipe wall of the inner heat conduction layer are annularly arranged and at least comprise two rings of through holes, and the through holes of adjacent rings are arranged in a staggered manner.

6. The leaky coaxial cable as claimed in claim 5, wherein: the through holes of the pipe wall of the inner heat conducting layer are provided with three rings, the cross sections of the through holes of the first two rings are circular, the through holes of the three rings are arranged in a staggered mode, and the side walls of the through holes of the outer rings extend into the space defined by the middle ring and the through holes of the inner ring.