CN210093203U

CN210093203U - Communication Dewar

Info

Publication number: CN210093203U
Application number: CN201921464599.9U
Authority: CN
Inventors: 陈逸凡
Original assignee: Shanghai Saibin Special Electronic Components Co Ltd
Current assignee: Shanghai Saibin Special Electronic Components Co Ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-02-18
Anticipated expiration: 2029-09-03

Abstract

The utility model provides a communication dewar, including the dewar bottle and set up in radio frequency module and thermal-insulated module in the dewar bottle, radio frequency module is used for receiving radio frequency signal, thermal-insulated module includes multilayer thermal-insulated membrane, multilayer thermal-insulated membrane covers in proper order radio frequency module's surface is with the parcel radio frequency module. Through setting up the thermal-insulated membrane of multilayer and effectively preventing the outside radiation of radio frequency module and leaking heat, avoid radio frequency module carries out heat transfer with the external world, can make radio frequency module be in microthermal operational environment for a long time, has not only promoted radio frequency module's working property has still prolonged the life of communication dewar, has practiced thrift use cost.

Description

Communication Dewar

Technical Field

The utility model relates to a superconductive technical field especially relates to a communication dewar.

Background

Since the discovery of high temperature superconductors, the superior properties of superconducting materials have attracted attention from countries around the world. The microwave device prepared by the high-temperature superconducting material has excellent performance and great application value, wherein the research on the high-temperature superconducting filter becomes a hot spot of the domestic and foreign superconducting application in recent years. Compared with a common metal filter, the high-temperature superconducting filter has the advantages of small in-band insertion loss, steep in band edge, good out-of-band suppression and the like, and has wide application prospects in various fields, but because the working temperature of the high-temperature superconducting filter is low, the high-temperature superconducting filter needs to be isolated from the outside for heat transfer while being deeply refrigerated, and the problem that how to reduce the radiation heat leakage of the high-temperature superconducting filter needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a communication dewar reduces radiation heat leakage when can guaranteeing the refrigeration effect, reduces the consumption of equipment, practices thrift the cost.

In order to achieve the above object, the utility model provides a communication dewar, including an inclosed dewar bottle and set up in radio frequency module and thermal-insulated module in the dewar bottle, radio frequency module is used for receiving radio frequency signal, thermal-insulated module includes the thermal-insulated membrane of multilayer, the multilayer thermal-insulated membrane wraps up in proper order radio frequency module.

Further, the heat insulation module also comprises a plurality of layers of polyester nets, and the adjacent two layers of heat insulation films are separated by the polyester nets.

Further, the number of the heat insulation films is 15-20.

Further, the heat insulation module further comprises a plurality of layers of annular heat shields, the plurality of layers of heat shields sequentially surround the heat insulation film, and the top and the bottom of the adjacent two layers of heat shields are connected in a staggered manner.

Further, the dewar body includes a dewar cavity and a cavity cover, the cavity cover is buckled with the dewar cavity to seal the dewar body, the dewar cavity includes an inner layer and an outer layer, and a gap is formed between the inner layer and the outer layer to form a vacuum interlayer.

Furthermore, the inner layer and the outer layer are both made of stainless steel, and the inner surface and the outer surface of the inner layer are both plated with a metal film.

Further, the communication dewar still includes first gas vent and second gas vent, first gas vent with dewar chamber intercommunication, the second gas vent with vacuum interlayer intercommunication, a vacuum module is all connected to first gas vent and second gas vent.

Further, the communication dewar is still including setting up the mount pad in the dewar intracavity, radio frequency module is fixed in on the lateral wall of mount pad, the multilayer thermal-insulated membrane still wraps up the mount pad.

Furthermore, the communication Dewar also comprises a refrigerator, wherein a cold finger of the refrigerator extends into the Dewar cavity from the outside of the Dewar cavity and penetrates through the heat insulation film to be connected with the mounting seat.

Further, the communication dewar further comprises a plurality of radio frequency connectors, wherein the radio frequency connectors are installed on the cavity cover and connected with the radio frequency module through cables.

The utility model provides a communication dewar, including an inclosed dewar bottle and set up in radio frequency module and thermal-insulated module in the dewar bottle, radio frequency module is used for receiving radio frequency signal, thermal-insulated module includes multilayer thermal-insulated membrane, multilayer thermal-insulated membrane wraps up in proper order radio frequency module. Prevent the outside radiation of radio frequency module and leak heat, avoid through setting up the thermal-insulated membrane of multilayer radio frequency module carries out heat transfer with the external world, can make radio frequency module be in microthermal operational environment for a long time, has not only promoted radio frequency module's working property has still prolonged the life of communication dewar, has practiced thrift use cost.

Drawings

Fig. 1 is a schematic structural diagram of a communication dewar according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a heat shield according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a mounting seat according to an embodiment of the present invention;

wherein the reference numerals are:

100-a radio frequency module; 200-a heat-insulating film; 210-a heat shield; 300-chamber cover; 310-an inner layer; 320-an outer layer; 400-a mounting seat; 410-mounting grooves; 500-cold finger of refrigerator; 600-a radio frequency connector; 700-a cable; 810-a first exhaust port; 820-a second exhaust port; 900-getter.

Detailed Description

The following description of the embodiments of the present invention will be described in more detail with reference to the drawings. Advantages and features of the present invention will become apparent from the following description and claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As shown in fig. 1, the present embodiment provides a communication dewar, which includes a closed dewar body, and a radio frequency module 100 and a thermal insulation module disposed in the dewar body, wherein the radio frequency module 100 is configured to receive a radio frequency signal, the thermal insulation module includes a plurality of thermal insulation films 200, and the plurality of thermal insulation films 200 sequentially cover the surface of the radio frequency module 100 to wrap the radio frequency module 200. Prevent the outside radiation of radio frequency module 100 through setting up multilayer thermal-insulated membrane 200 and leak heat, avoid radio frequency module 100 carries out heat transfer with the external world to make radio frequency module 100 be in microthermal operational environment for a long time, not only promoted radio frequency module 100's working property has still prolonged the life of communication dewar, has practiced thrift use cost.

The communication Dewar is mainly applied to a front-end receiver system for communication, and can be integrated with the front end of the receiver due to the small size, the working temperature of a radio frequency module in the communication Dewar is about-200 ℃, the external temperature is normal temperature, the radio frequency module 100 can be in a low-temperature state for a long time through the multilayer heat insulation film 200, the radio frequency module 100 is prevented from radiating and leaking heat outwards, the radio frequency module is close to an ideal frequency response characteristic, the interference of out-of-band frequency is better inhibited, and therefore the communication quality is improved. The rf module 100 includes a plurality of superconducting filters and a plurality of low noise amplifiers, and the superconducting filters and the low noise amplifiers are sealed by the heat insulating film.

The heat insulation film 200 includes, but is not limited to, mylar, which is preferred because of its good heat insulation and low cost.

Further, the heat insulation module further comprises a plurality of layers of polyester nets (not shown), two adjacent layers of the heat insulation film 200 are separated by the polyester nets, and the polyester nets can separate the plurality of layers of the heat insulation film 200 to achieve a better heat insulation effect. Preferably, through thermal simulation analysis and experimental research, it is found that the thermal insulation effect is optimal when the number of layers of the thermal insulation film 200 covering the radio frequency module is 15-20, the radiant heat leakage is minimal, the heat leakage is obviously increased when the number of layers of the thermal insulation film 200 is less than 15, the thermal insulation effect is not obviously improved when the number of layers of the thermal insulation film 200 is greater than 20, the weight is increased, and the cost is correspondingly increased.

With continued reference to fig. 1 and 2, the thermal insulation module further includes a plurality of annular thermal shields 210, which sequentially surround the thermal film and are connected to the top and bottom of two adjacent thermal shields in a staggered manner. By arranging the multi-layer annular heat shield 210 outside the multi-layer heat insulation film 200, the heat insulation effect can be further improved, and the radio frequency module 100 is prevented from radiating and leaking heat outwards.

The top and the bottom of two adjacent layers of heat shields 210 are connected in a staggered manner, specifically as shown in fig. 2, the plurality of layers of heat shields 210 are corrugated along the shape of the cross section perpendicular to the axial direction of the dewar cavity, the heat insulating film 200 is located in the innermost layer of heat shields 210, and the path of heat transfer can be increased by arranging the plurality of layers of heat shields 210, so as to increase the time required by the radio frequency module 100 to radiate heat leakage, thereby reducing the overall heat leakage.

The heat shield 210 can be made of stainless steel, and can be formed into a desired shape by laser welding or nickel electroforming, and the surface of the heat shield 210 can be polished and plated with gold to improve the infrared emissivity of the surface, which is more conducive to reducing radiation heat leakage.

With reference to fig. 1, the dewar body includes a dewar cavity and a cavity cover 300, the cavity cover 300 is fastened to the dewar cavity to seal the dewar body, the dewar cavity includes an inner layer 310 and an outer layer 320, and a gap is formed between the inner layer 310 and the outer layer 320 to form a vacuum interlayer.

The shape of the dewar cavity includes, but is not limited to, a cylinder and an ellipsoid, it is understood that the bottom of the inner layer 310 has a certain gap with the outer layer 320, and the inner layer 310 and the outer layer 320 are hermetically connected near one end of the cavity cover 300, the inner surface of the inner layer 310 forms the dewar cavity of the dewar body, the hermetic connection may be welding, and, for convenience of transporting and sealing the dewar cavity, when welding the ends of the outer layer 320 and the inner layer 310, a part of the structure, for example, the structure is a ring, may be extended from the end of the outer layer 320 to the outside of the dewar cavity. Or, when the dewar bottle is produced, a flange plate can be processed at the end where the outer layer 320 and the inner layer 310 are connected, the flange plate and the dewar cavity are of an integrally formed structure, the diameter of the flange plate is larger than that of the outer layer 320, meanwhile, the cavity cover 300 is also welded with a flange plate matched with the flange plate, and the two flange plates are connected and sealed through bolts.

The material of inlayer 310 and skin 320 can be but not limited to the stainless steel, the thickness scope of skin 320 can be greater than the thickness scope of inlayer 310, just the interior external surface of inlayer 310 all can carry out the gold plating polishing in order to improve the infrared emissivity on surface, further reduces the inside radiation heat leak of dewar chamber, and is preferred, the gold plating layer is industrial pure gold, and the cladding thickness scope can be 5um ~ 20 um.

The chamber cover 300 is connected with the dewar chamber in an airtight manner. The chamber cover 300 can be a disc structure, the diameter of the chamber cover is larger than that of the outer layer so as to completely seal the Dewar cavity, a plurality of threaded holes are formed in the edge of the chamber cover 300, the chamber cover 300 is connected with the Dewar cavity in an airtight mode through threads, and the chamber cover 300 can be connected with the Dewar cavity in a flange mode so as to be conveniently detached and maintained.

Preferably, the cavity cover 300 may be sealed by a sealing member when connected to the dewar cavity, and when the dewar cavity is a cylinder, the cavity cover is generally sealed by an O-ring or an oxygen-free copper gasket, because the O-ring is made of a non-metal material, gas is released in vacuum to reduce the vacuum degree of the dewar cavity, and the oxygen-free copper gasket releases little gas in vacuum, which hardly affects the vacuum degree of the dewar cavity, and may be preferably used. When the section shape of the Dewar cavity is polygonal or other irregular shapes, a sealing mode of adding an indium wire into a sealing groove can be adopted, the sealing groove is fixed at the edge of the Dewar cavity, two ends of the indium wire are cut into inclined planes matched with each other, then the indium wire is coiled into a shape matched with the Dewar cavity, and the inclined planes at the two ends of the indium wire are butted and compressed and then are placed into the sealing groove.

With reference to fig. 1 and fig. 3, the communication dewar further includes a mounting seat 400 disposed in the dewar cavity, the rf module 100 is fixed on a sidewall of the mounting seat 400, and the mounting seat 400 is wrapped by the heat insulation film 200, so that more rf modules 100 can be mounted through the mounting seat 400, and more received signals can be processed at the same time, thereby improving efficiency.

The communication dewar further comprises a refrigerator, wherein a cold finger 500 of the refrigerator extends from the outside of the dewar cavity into the dewar cavity and is connected with the mounting seat 400 through the heat insulation film 200. The refrigerator is used for refrigerating the radio frequency module 100 so that the radio frequency module is in a low-temperature working environment, and meanwhile, due to the double heat insulation of the heat insulation film 200 and the multi-layer heat insulation screen 210, the power of the refrigerating module can be greatly reduced, and the use cost is reduced.

Specifically, referring to fig. 3, fig. 3 is a schematic structural diagram of a mounting seat 400 according to an embodiment of the present invention, the mounting seat 400 has a mounting groove 410, and a cold finger 500 of the refrigerator is inserted into the mounting groove 410 to connect the mounting seat 400, but may also be other detachable connection manners, such as a threaded connection. Similarly, the cold finger 500 of the refrigerator and the mounting groove 410 can be sealed by an indium wire, so as to ensure better sealing effect. Meanwhile, the surface of the mounting base 400 is provided with a threaded hole for mounting the rf module 100, in this embodiment, the rf module 100 can be mounted on all 4 side walls of the mounting base 400.

With continued reference to fig. 1, the communication dewar further includes a plurality of rf connectors 600, wherein the rf connectors 600 are mounted on the cavity cover 300 and connected to the rf module 100 through cables 700. The rf connector 600 is used to connect with other communication devices and transmit the processed signals.

The communication dewar still includes and sets up first exhaust port 810 and second exhaust port 820 on the dewar bottle lateral wall relatively, first exhaust port 810 by the lateral wall is outer to extend in the dewar intracavity is with the intercommunication the dewar chamber, second exhaust port 820 by the lateral wall is outer to extend in the vacuum interlayer is with the intercommunication the vacuum interlayer, and a vacuum pumping subassembly passes through first exhaust port 810 and second exhaust port 820 are right respectively dewar chamber and vacuum interlayer evacuation, and the structure through two vacuums can improve the reliability of the inside vacuum degree of dewar, improves the life of communication dewar, can also play thermal-insulated effect simultaneously, reduces the radiation and leaks heat.

Preferably, a plurality of getters 900 may be further disposed on the inner wall of the dewar chamber to absorb gas in the dewar chamber. Since the material inside the dewar cavity releases hydrogen, oxygen, nitrogen, carbon monoxide and other polluted gases, the vacuum degree inside the dewar is attenuated, and the vacuum degree inside the dewar can be maintained by adopting the getter 900. The getter 900 may be a plurality of non-evaporable getters, the number of the non-evaporable getters may be set according to the volume of the dewar cavity, and a plurality of small holes may be formed in the sidewall of the dewar cavity to fix the non-evaporable getters.

To sum up, the utility model provides a communication dewar utilizes refrigeration module to the radio frequency module refrigeration, prevents the outside radiation of radio frequency module and leaks heat through setting up multilayer thermal-insulated membrane and heat screen, avoids radio frequency module carries out heat transfer with the external world, can make radio frequency module be in microthermal operational environment for a long time, has not only promoted radio frequency module's working property has prolonged the life of communication dewar, has still reduced refrigeration module's consumption simultaneously, has practiced thrift use cost.

The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.

Claims

1. The utility model provides a communication dewar, its characterized in that, including a inclosed dewar bottle and set up in radio frequency module and thermal-insulated module in the dewar bottle, radio frequency module is used for receiving radio frequency signal, thermal-insulated module includes the multilayer thermal-insulated membrane, the multilayer thermal-insulated membrane wraps up in proper order radio frequency module.

2. The communication dewar of claim 1, wherein said heat insulating module further comprises a plurality of layers of polyester mesh, adjacent two layers of said heat insulating film being separated by said polyester mesh.

3. The communication dewar of claim 2, wherein the number of layers of the heat insulating film is between 15 and 20.

4. The communication dewar of claim 1, wherein said heat insulating module further comprises a plurality of layers of ring-shaped heat shields, said plurality of layers of said heat shields sequentially surrounding said heat insulating film, and top and bottom of adjacent two layers of said heat shields being alternately connected.

5. The communication dewar of claim 1, wherein the dewar includes a dewar cavity and a cavity cover, the cavity cover is buckled with the dewar cavity to seal the dewar, the dewar cavity includes an inner layer and an outer layer, and a gap is formed between the inner layer and the outer layer to form a vacuum interlayer.

6. The communication dewar of claim 5, wherein the inner layer and the outer layer are made of stainless steel, and the inner and outer surfaces of the inner layer are plated with a metal film.

7. The communication dewar of claim 5, further comprising a first exhaust port and a second exhaust port, said first exhaust port communicating with said dewar cavity, said second exhaust port communicating with said vacuum interlayer, said first and second exhaust ports each being connected to a vacuum assembly.

8. The communication dewar of claim 5, further comprising a mounting seat disposed within a dewar cavity, wherein said radio frequency module is fixed on a side wall of said mounting seat, and wherein said plurality of layers of said thermal insulating film further wraps said mounting seat.

9. The communication dewar of claim 8, further comprising a refrigerator having a cold finger protruding from outside the dewar cavity into the dewar cavity and connected to the mount through the heat insulating film.

10. The communication dewar of claim 5, further comprising a plurality of radio frequency connectors mounted on the cavity cover and connected with the radio frequency module by a cable.