Liquid nitrogen thermostat for astronomical exploration and design method

Abstract

The invention relates to the technical field of liquid nitrogen thermostats, and discloses a liquid nitrogen thermostat for astronomical exploration and a design method. A liquid storage liner; the flange is arranged at the top of the shell and is also positioned at the upper part of the liquid storage liner; the two heat insulation infusion neck tubes are symmetrically arranged on the upper surface of the liquid storage inner container, the heat insulation infusion neck tubes are communicated with the liquid storage inner container, and the upper portions of the heat insulation infusion neck tubes penetrate out of the flange; the Dewar cold platform is arranged at the upper part of the liquid storage liner; the cold shield is arranged at the upper part of the Dewar cold platform; the cold shield is sleeved with the window cap, and the bottom of the window cap is fixed to the flange; the air suction cavity is arranged at the lower part of the liquid storage liner; the two heat insulation auxiliary supports are arranged at the lower part of the air suction cavity; the supporting sealing bottom is arranged at the bottom of the heat insulation auxiliary support; and a connector. The liquid nitrogen thermostat can be matched with astronomical telescopes of different specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid nitrogen thermostats, and in particular to a liquid nitrogen thermostat for astronomical detection and a design method thereof. Background Art

[0002] At present, the front optical systems of existing large astronomical telescopes are mostly cylindrical, and the liquid nitrogen thermostat for astronomical detection is installed at the tail end of the front optical system, that is, close to the ground. This requires the detector focal plane of the liquid nitrogen thermostat to receive optical energy upward. During astronomical observation, the central axis of the front optical system and the perpendicular line of the ground plane form a certain angle in two planes. The angles in these two planes are defined as pitch. In addition, in order to coordinate the optical alignment of the front optical system of the astronomical telescope and the focal plane in the thermostat, the liquid nitrogen thermostat needs to be able to rotate 360 ​​degrees with the normal line of the focal plane of the liquid nitrogen thermostat as the center.

[0003] Conventional liquid nitrogen constant temperature devices in the prior art cannot match large astronomical telescopes for pitch and rotation.

[0004] Therefore, it is necessary to provide a liquid nitrogen thermostat for astronomical detection and a design method to solve the problem that conventional liquid nitrogen thermostats cannot match large astronomical telescopes for pitch and rotation. Summary of the invention

[0005] In view of this, the present invention proposes a liquid nitrogen thermostat for astronomical detection and a design method, aiming to solve the problem that conventional liquid nitrogen thermostats cannot match large astronomical telescopes for pitch and rotation.

[0006] In one aspect, the present invention provides a liquid nitrogen thermostat for astronomical detection, comprising:

[0007] The outer shell is a hollow structure;

[0008] A liquid storage liner, arranged in the outer shell;

[0009] A flange is arranged on the top of the shell, and the flange is also located on the upper part of the liquid storage liner;

[0010] There are two insulated infusion neck tubes, which are symmetrically arranged on the upper surface of the liquid storage liner, the insulated infusion neck tubes are connected to the liquid storage liner, and the upper part of the insulated infusion neck tubes passes through the flange, one of the insulated infusion neck tubes is used to transport liquid, and the other insulated infusion neck tube is used to transport gas generated by the volatilization of liquid nitrogen;

[0011] A Dewar cooling platform is arranged on the upper part of the liquid storage tank;

[0012] A cold shield is arranged on the upper part of the Dewar cold platform;

[0013] A window cap is sleeved on the outside of the cold shield, and the bottom of the window cap is fixed on the flange;

[0014] An air suction cavity is arranged at the lower part of the liquid storage liner;

[0015] At least two heat-insulating auxiliary supports are provided, and the two heat-insulating auxiliary supports are provided at the lower part of the suction cavity;

[0016] A support sealing bottom, arranged at the bottom of the thermal insulation auxiliary support, and the support sealing bottom is also sealed and connected to the shell;

[0017] The connector is arranged on the outer side wall of the shell.

[0018] Furthermore, the sealing bottom comprises:

[0019] A support bottom, arranged at one end of the heat-insulating auxiliary support away from the air suction cavity;

[0020] The auxiliary sealing bottom is arranged on a side of the support bottom away from the thermal insulation auxiliary support, and the auxiliary sealing bottom is sealed and connected to the shell.

[0021] Furthermore, a filter is provided on the cold screen.

[0022] Furthermore, the bottom of the window cap is connected to the flange via a rotating pressing block;

[0023] A light window is arranged in the middle of the top end of the window cap.

[0024] Furthermore, the Dewar cooling platform is provided with terminal posts.

[0025] Furthermore, the liquid nitrogen thermostat for astronomical detection also includes:

[0026] The air extraction valve is arranged on the outer side wall of the shell.

[0027] Furthermore, the thermal insulation infusion neck tube is arranged within the circumference of the upper surface of the liquid storage liner at equal distances from the center of the upper surface and distributed at 180 degrees;

[0028] The circumferential central axes of the two insulated infusion neck tubes 4 are arranged in a plane with a smaller pitch angle between the central axis of the front optical system and the perpendicular line of the ground plane, and the pitch angle required for different telescope observations is matched by changing the distance from the insulated infusion neck tube to the center of the circumferential surface of the upper surface of the liquid storage liner;

[0029] When a larger pitch angle is required, the insulated infusion neck tube is moved away from the center of the upper surface of the liquid storage liner; when a smaller pitch angle is required, the insulated infusion neck tube is moved close to the center of the upper surface of the liquid storage liner.

[0030] Furthermore, two insulating auxiliary supports are arranged at the bottom of the air inhalation cavity and are arranged at 90 degrees to the insulating neck tube so as to bear the weight of the liquid nitrogen and the liquid storage liner and maintain mechanical balance;

[0031] The circumferential central axes of the two heat-insulating auxiliary supports are arranged in a plane where the central axis of the optical system and the perpendicular line of the ground plane form a larger pitch angle.

[0032] Compared with the prior art, the beneficial effect of the present invention is that the present invention installs a cold platform on the upper surface of the liquid storage liner. Two insulated infusion neck tubes are installed on the outer side of the upper circumferential surface of the liquid storage liner, and the insulated infusion neck tubes are arranged at equal distances relative to the center of the upper surface circle in the circumferential surface of the upper surface of the liquid storage liner. One of them is used as an infusion channel during infusion, and the other is used as a gas-release channel for liquid nitrogen gasification and volatilization. After the liquid nitrogen input is completed, the two tubes are used as liquid nitrogen volatilization gas-release channels at the same time. Liquid nitrogen is transported from top to bottom, which meets the requirement of natural volatilization of liquid nitrogen, and the solid conduction of the inner liner wall is used to realize the liquid nitrogen refrigeration of the Dewar cold platform above the inner liner. It is suitable for occasions required for visible light, near-infrared, and short-wave astronomical detection for ground astronomical observation. The present invention solves the problem that conventional liquid nitrogen constant temperature devices cannot match large astronomical telescopes for pitch and rotation. At the same time, according to the pitch angle, interface form and optical parameters of the astronomical telescope, the position of the liquid nitrogen infusion port, the parameters of the internal optical components, etc. can be changed to achieve the purpose of matching astronomical telescopes of different specifications.

[0033] On the other hand, the present application also provides a method for designing a liquid nitrogen thermostat for astronomical detection, comprising:

[0034] A blind hole for mounting the Dewar cold platform is reserved in the center of the upper cover of the liquid storage liner. The insulated infusion neck tube is passed through the stepped light hole reserved on the flange and then fixed to the upper cover of the liquid storage liner and sealed with glue.

[0035] Install an air suction cavity and air suction material below the bottom of the liquid storage tank, carry out radiation-proof multi-layer wrapping treatment on the side of the liquid storage tank, assemble the flange and the shell, seal them with glue, install an air extraction valve on the shell, and seal them with glue;

[0036] Install the insulation auxiliary support column and the support bottom on the bottom of the suction cavity in sequence, and fix them with glue, and finally screw in and install two auxiliary sealing bottoms, and seal them with glue;

[0037] The Dewar cold platform with terminal posts and inner leads is screwed to the upper cover of the liquid storage tank through gaskets, the inner leads of the Dewar cold platform are welded to the connector, and sealed with glue;

[0038] Rotate and install the upper cover of the liquid storage tank, and seal it with glue;

[0039] Install the cold screen with filter on the Dewar cold platform and fix it with screws;

[0040] Install the rubber ring into the rubber ring groove reserved on the upper cover of the liquid storage tank, and install the window cap with the window by rotating the pressing block.

[0041] It is understandable that the liquid nitrogen thermostat and design method for astronomical detection provided in this application have the same beneficial effects and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0043] Figure 1 A cross-sectional view of a liquid nitrogen thermostat for astronomical detection provided by an embodiment of the present invention;

[0044] Figure 2 A flow chart of a method for designing a liquid nitrogen thermostat for astronomical detection provided in an embodiment of the present invention.

[0045] In the figure, 1, outer shell; 101, exhaust valve; 2, liquid storage tank; 3, flange; 4, insulated infusion neck tube; 5, Dewar cold platform; 501, terminal; 6, cold screen; 601, filter; 7, window cap; 8, suction cavity; 9, insulated auxiliary support; 10, support sealing bottom; 1001, support bottom; 1002, auxiliary sealing bottom; 11, connector; 12, rotating block. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a communication between the inner sides of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In some embodiments of the present application, see Figure 1 As shown, this embodiment provides a liquid nitrogen thermostat for astronomical detection, including:

[0051] The housing 1 is a hollow structure;

[0052] A liquid storage liner 2 is arranged in the outer shell 1;

[0053] The flange 3 is arranged on the top of the shell 1, and the flange 3 is also located on the upper part of the liquid storage liner 2;

[0054] There are two insulated infusion neck tubes 4, which are symmetrically arranged on the upper surface of the liquid storage liner 2, and the insulated infusion neck tubes 4 are connected to the liquid storage liner 2. The upper part of the insulated infusion neck tubes 4 passes through the flange 3, one of the insulated infusion neck tubes 4 is used to transport liquid, and the other insulated infusion neck tube 4 is used to transport gas generated by liquid nitrogen volatilization;

[0055] The Dewar cooling platform 5 is arranged on the upper part of the liquid storage tank 2;

[0056] A cold shield 6 is arranged on the upper part of the Dewar cold platform 5;

[0057] The window cap 7 is sleeved on the outside of the cold shield 6, and the bottom of the window cap 7 is fixed on the flange 3;

[0058] The air suction chamber 8 is arranged at the lower part of the liquid storage liner 2;

[0059] At least two heat-insulating auxiliary supports 9 are provided, and the two heat-insulating auxiliary supports 9 are provided at the lower part of the suction cavity 8;

[0060] A supporting sealing bottom 10 is arranged at the bottom of the heat-insulating auxiliary support 9, and the supporting sealing bottom 10 is also sealed and connected to the housing 1;

[0061] The connector 11 is arranged on the outer side wall of the housing 1 .

[0062] Specifically, the cavity of the liquid storage liner 2 of the present invention is made of high thermal conductivity aluminum alloy material, and a Dewar cold platform 5 is installed on the upper surface of the liquid storage liner 2. Two insulated infusion neck tubes 4 are installed on the outer side of the upper circumferential surface of the liquid storage liner 2, and the insulated infusion neck tubes 4 are arranged at equal distances relative to the center of the upper surface within the circumferential surface of the liner and distributed at 180 degrees. One of them is used as an infusion channel during infusion, and the other is used as a gas release channel for liquid nitrogen vaporization and volatilization. After the liquid nitrogen input is completed, the two tubes are simultaneously used as liquid nitrogen volatilization gas release channels. Liquid nitrogen is transported from top to bottom, which meets the requirement of natural volatilization of liquid nitrogen, and the solid conduction of the liner wall is used to realize liquid nitrogen refrigeration of the Dewar cold platform 5 above the liner.

[0063] During the design, the distance between the two insulated infusion tubes and the center of the circle on the upper surface of the liquid storage liner 2 is adjusted to meet the smaller pitch angle requirement of the two planes of the astronomical detection pitch requirement. The larger pitch angle is designed in the direction perpendicular to the two insulated infusion neck tubes 4. In addition, since the air outlet of the insulated infusion neck tube 4 is upward, after the liquid nitrogen is injected into the liquid nitrogen thermostat, the liquid nitrogen thermostat can rotate 360 ​​degrees around the rotation center of the liquid nitrogen thermostat cylinder, and the liquid nitrogen will not overflow, ensuring that the detection focal plane can continue to be at a low temperature.

[0064] It is understandable that the inner surface of the cold shield 6 is roughened by sandblasting and a graphene black coating with a reflection spectrum of less than 1% within 2-14 microns is used. The upper end of the window cap 7 has an external thread, which can be used to install a background light barrel between the liquid nitrogen thermostat and the front optical system to avoid stray light outside the field of view.

[0065] In some embodiments of the present application, the sealed bottom comprises:

[0066] A support bottom 1001 is arranged at one end of the heat-insulating auxiliary support 9 away from the air suction cavity 8;

[0067] The auxiliary sealing bottom 1002 is arranged on a side of the supporting bottom 1001 away from the auxiliary insulating support 9 , and the auxiliary sealing bottom 1002 is sealed and connected to the outer shell 1 .

[0068] In some embodiments of the present application, a filter 601 is further provided on the cold shield 6 .

[0069] In some embodiments of the present application, the bottom of the window cap 7 is connected to the flange 3 via a rotating pressing block 12;

[0070] A light window is arranged in the middle of the top of the window cap 7 .

[0071] In some embodiments of the present application, a terminal post 501 is provided on the Dewar cooling platform 5 .

[0072] In some embodiments of the present application, the liquid nitrogen thermostat for astronomical detection further includes:

[0073] The air extraction valve 101 is arranged on the outer wall of the shell 1 .

[0074] In some embodiments of the present application, the insulated infusion neck tube 4 is arranged within the circumference of the upper surface of the liquid storage liner 2 at equal distances from the center of the upper surface and distributed at 180 degrees;

[0075] The circumferential central axes of the two insulated infusion neck tubes 4 are arranged in a plane with a smaller pitch angle between the central axis of the front optical system and the perpendicular line of the ground plane, and the pitch angles required for different telescope observations are matched by changing the distance from the insulated infusion neck tubes 4 to the center of the circumferential surface of the upper surface of the liquid storage liner 2;

[0076] When a larger pitch angle is required, the insulated infusion neck tube 4 is moved away from the center of the upper surface of the liquid storage liner 2; when a smaller pitch angle is required, the insulated infusion neck tube 4 is moved close to the center of the upper surface of the liquid storage liner 2.

[0077] In some embodiments of the present application, two insulating auxiliary supports 9 are arranged at the bottom of the air inhalation cavity 8 and are arranged at 90 degrees to the insulating neck tube so as to bear the weight of the liquid nitrogen and the liquid storage liner 2 and maintain mechanical balance;

[0078] Before the circumferential central axes of the two heat-insulating auxiliary supports 9 are arranged, the central axis of the optical system is in a plane with a large pitch angle with the perpendicular line of the ground plane.

[0079] On the other hand, see Figure 2 As shown, the present application also provides a design method for a liquid nitrogen thermostat for astronomical detection, which is applied to the above-mentioned liquid nitrogen thermostat for astronomical detection, and includes the following steps:

[0080] S100, a blind hole is left in the center of the upper cover of the liquid storage liner 2 for mounting the Dewar cold platform 5, and the insulated infusion neck tube 4 is passed through the stepped light hole reserved on the flange 3 and then fixed to the upper cover of the liquid storage liner 2 and sealed with glue;

[0081] S200, install the air suction chamber 8 and the air suction material below the bottom of the liquid storage liner 2, carry out radiation-proof multi-layer wrapping treatment on the side of the liquid storage liner 2, assemble the flange 3 and the shell 1, and after sealing with glue, install the air extraction valve 101 on the shell 1 and seal with glue;

[0082] S300, install the insulation auxiliary support 9 column and the support bottom 1001 at the bottom of the suction cavity 8 in sequence, and fix them with glue, and finally screw in and install two auxiliary sealing bottoms 1002, and seal them with glue;

[0083] S400, screw the Dewar cold platform 5 with the terminal 501 and the inner lead to the upper cover of the liquid storage tank 2 through the gasket, weld the inner lead of the Dewar cold platform 5 to the connector 11, and seal it with glue;

[0084] S500, rotating and inserting the upper cover of the liquid storage liner 2, and sealing with glue;

[0085] S600, install the cold shield 6 with the filter 601 on the Dewar cold platform 5 and fix it with screws;

[0086] S700 , insert the rubber ring into the rubber ring groove reserved on the upper cover of the liquid storage liner 2 , and install the window cap 7 with the window by rotating the pressing block 12 .

[0087] It is understandable that the present invention is installed at the rear end of the optical system in front of a large telescope, i.e., in the direction close to the ground, through the light hole in the flange 3 in the middle section of the liquid nitrogen thermostat. The focal plane of the liquid nitrogen thermostat is substantially flush with the mounting interface of the telescope. The window cap 7, cold screen 6 and other parts of the liquid nitrogen thermostat extend into the telescope. The liquid storage tank 2 chambers of the liquid nitrogen thermostat, the vacuum exhaust valve 101, and the electrical connector box are below the rear end of the telescope.

[0088] The liquid storage liner 2 of the present invention adopts a high thermal conductivity aluminum alloy material, and a cold platform is installed on the upper surface of the liquid storage liner 2. Two insulated infusion neck tubes 4 are installed on the outer side of the upper circumferential surface of the liquid storage liner 2. The insulated infusion neck tubes 4 are arranged at equal distances relative to the center of the upper surface in the circumferential surface of the upper surface of the liquid storage liner 2 and are distributed at 180 degrees. One of them is used as an infusion channel during infusion, and the other is used as a gas-release channel for liquid nitrogen gasification and volatilization. After the liquid nitrogen input is completed, the two are simultaneously used as liquid nitrogen volatilization gas-release channels. Liquid nitrogen is transported from top to bottom, which meets the requirements of natural volatilization of liquid nitrogen, and the solid conduction of the wall of the liquid storage liner 2 is used to realize the liquid nitrogen refrigeration of the Dewar cold platform 5 above the liquid storage liner 2. A vacuum-maintained suction cavity 8 is installed below the liquid storage liner 2. Two insulated auxiliary supports 9 are installed in the cavity at 90 degrees from the insulated neck tube. It is used to bear the weight of liquid nitrogen and the liquid storage liner 2 to maintain mechanical balance.

[0089] The liquid storage liner 2 of the present invention is made of high thermal conductivity aluminum alloy material, the liquid storage liner 2 is processed into a barrel structure with an upper cover but no bottom, and the bottom of the liquid storage liner 2 is processed into a flat plate structure. The connection between the two is first threaded and then sealed by filling glue in the glue storage tank. The upper cover of the liquid storage liner 2 is reserved with threaded holes for installing the insulating infusion neck tube 4 and a glue storage tank. The side mounting holes for installing the suction cavity 8 are processed on the bottom of the liquid storage liner 2. The lower bottom surface of the suction material cavity is a flat plate structure, and a blind hole for installing the insulating auxiliary support 9 is reserved. The connection line of the two holes is distributed at 90 degrees to the connection line of the installation hole of the insulating infusion neck tube 4 on the upper cover of the liquid storage liner 2. The material of the insulating infusion neck tube 4 and the insulating auxiliary support 9 is an insulating epoxy tube material. The support bottom 1001 adopts a 90-degree I-shaped plane structure to achieve insulation, and also adopts an insulating epoxy board material. Other metal parts are made of aluminum alloy material.

[0090] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0091] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0092] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0093] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A liquid nitrogen thermostat for astronomical detection, characterized in that: include: The outer shell is a hollow structure; A liquid storage liner, arranged in the outer shell; A flange is arranged on the top of the shell, and the flange is also located on the upper part of the liquid storage liner; There are two insulated infusion neck tubes, which are symmetrically arranged on the upper surface of the liquid storage liner, the insulated infusion neck tubes are connected to the liquid storage liner, and the upper part of the insulated infusion neck tubes passes through the flange, one of the insulated infusion neck tubes is used to transport liquid, and the other insulated infusion neck tube is used to transport gas generated by the volatilization of liquid nitrogen; A Dewar cooling platform is arranged on the upper part of the liquid storage tank; A cold shield is arranged on the upper part of the Dewar cold platform; A window cap is sleeved on the outside of the cold shield, and the bottom of the window cap is fixed on the flange; An air suction cavity is arranged at the lower part of the liquid storage liner; At least two heat-insulating auxiliary supports are provided, and the two heat-insulating auxiliary supports are provided at the lower part of the suction cavity; A support sealing bottom, arranged at the bottom of the thermal insulation auxiliary support, and the support sealing bottom is also sealed and connected to the shell; The connector is arranged on the outer side wall of the shell.

2. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: The sealing bottom comprises: A support bottom, arranged at one end of the heat-insulating auxiliary support away from the air suction cavity; The auxiliary sealing bottom is arranged on a side of the support bottom away from the thermal insulation auxiliary support, and the auxiliary sealing bottom is sealed and connected to the shell.

3. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: The cold screen is also provided with a filter.

4. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: The bottom of the window cap is connected to the flange via a rotating pressing block; A light window is arranged in the middle of the top end of the window cap.

5. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: The Dewar cooling platform is provided with a terminal post.

6. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: The liquid nitrogen thermostat for astronomical detection also includes: The air extraction valve is arranged on the outer side wall of the shell.

7. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: The insulated infusion neck tube is arranged within the circumference of the upper surface of the liquid storage liner at equal distances from the center of the upper surface and distributed at 180 degrees; The circumferential central axes of the two insulated infusion neck tubes 4 are arranged in a plane with a smaller pitch angle between the central axis of the front optical system and the perpendicular line of the ground plane, and the pitch angle required for different telescope observations is matched by changing the distance from the insulated infusion neck tube to the center of the circumferential surface of the upper surface of the liquid storage liner; When a larger pitch angle is required, the insulated infusion neck tube is moved away from the center of the upper surface of the liquid storage liner; when a smaller pitch angle is required, the insulated infusion neck tube is moved close to the center of the upper surface of the liquid storage liner.

8. The liquid nitrogen thermostat for astronomical detection according to claim 1, characterized in that: Two insulating auxiliary supports are arranged at the bottom of the air inhalation cavity and are arranged at 90 degrees to the insulating neck tube so as to bear the weight of the liquid nitrogen and the liquid storage liner and maintain mechanical balance; The circumferential central axes of the two heat-insulating auxiliary supports are arranged in a plane where the central axis of the optical system and the perpendicular line of the ground plane form a larger pitch angle.

9. A method for designing a liquid nitrogen thermostat for astronomical detection, applied to the liquid nitrogen thermostat for astronomical detection as claimed in any one of claims 1 to 8, characterized in that: include: A blind hole for mounting the Dewar cold platform is reserved in the center of the upper cover of the liquid storage liner. The insulated infusion neck tube is passed through the stepped light hole reserved on the flange and then fixed to the upper cover of the liquid storage liner and sealed with glue. Install an air suction cavity and air suction material below the bottom of the liquid storage tank, carry out radiation-proof multi-layer wrapping treatment on the side of the liquid storage tank, assemble the flange and the shell, seal with glue, install an air extraction valve on the shell, and seal with glue; Install the insulation auxiliary support column and the support bottom on the bottom of the suction cavity in sequence, and fix them with glue, and finally screw in and install two auxiliary sealing bottoms, and seal them with glue; The Dewar cold platform with the terminal and the inner lead is screwed to the upper cover of the liquid storage tank through the gasket, the inner lead of the Dewar cold platform is welded to the connector, and the glue is poured to seal it; Rotate and install the upper cover of the liquid storage tank, and seal it with glue; Install the cold screen with filter on the Dewar cold platform and fix it with screws; Install the rubber ring into the rubber ring groove reserved on the upper cover of the liquid storage tank, and install the window cap with the window by rotating the pressing block.

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