Helium wide-temperature-range temperature adjusting device for infrared calibration blackbody source

Abstract

The utility model provides a helium wide-temperature-zone temperature adjusting device for an infrared calibration blackbody source, which relates to the field of calibration tests of infrared optical remote sensors of spacecrafts and comprises a compressor, a helium filling port, a shunting device, a gas heater and a calibration source body. Wherein the outlet end of the compressor is connected to the flow dividing device, and the helium filling port is located between the compressor and the flow dividing device; the other end of the flow dividing device is connected to the gas heater, the other end of the gas heater is connected to the calibration source body, and the other end of the calibration source body is connected to the inlet end of the compressor. According to the utility model, helium is used as a medium, cold energy and heat energy are transmitted, the temperature of the calibration source is controlled, the wide-temperature-zone temperature control requirement of the calibration source from 50K to higher 500K is met, and the calibration source can be installed in a vacuum container of spacecraft thermal test vacuum equipment in various postures and positions.

Description

Technical Field

[0001] The utility model relates to the technical field of calibration test of spacecraft infrared optical remote sensors, in particular to a helium wide temperature range temperature regulating device for infrared calibration black body sources. Background Art

[0002] The spacecraft infrared optical remote sensing payload needs to be calibrated on the ground to ensure the effectiveness of the data observation quality.

[0003] According to current practice, a blackbody calibration source is used to provide a radiation reference for infrared optical remote sensing payloads. The blackbody calibration source is controlled in different temperature ranges to simulate the different infrared radiation intensities required for calibration of spacecraft infrared optical payloads.

[0004] The existing invention patent with publication number CN114705305A discloses a high-altitude and high-temperature infrared calibration design system, including a smart terminal and a calibration source; the smart terminal includes a first wireless communication module and an instruction input module; the calibration source includes a second wireless communication module and a second processor, and the second processor is used to output an operation mode to an actuator after receiving an operation instruction, and output a termination mode to the actuator after receiving a termination instruction; the actuator includes a thermal insulation core, a radiation surface, a thermal insulation cover, and a telescopic part, so that the radiation surface is not blocked by the thermal insulation cover when in operation, and is covered by the thermal insulation cover when not in operation to avoid temperature loss.

[0005] As the performance of spacecraft infrared optical payloads continues to improve, the range of observation continues to expand. The conventional method of liquid nitrogen refrigeration combined with electric heating has been difficult to adapt to lower temperature ranges. When the lower limit of the temperature required for the test is lower than the liquid nitrogen temperature zone, a lower temperature mechanical refrigerator must be used. Due to problems with the material system, the material used in the cold head of the cryogenic refrigerator is difficult to withstand temperatures above 323K (50°C) for a long time. Therefore, the existing installation method will shorten the maintenance cycle and the operating cost is extremely high.

[0006] Since the cold head is in direct contact with the surface of the calibration source, the cold energy is concentrated on the contact surface and then diffused by heat conduction, which significantly increases the temperature unevenness on the surface of the calibration source. In order to avoid this problem, a large number of cold heads are often required, or the metal material of the calibration source is thickened, which increases the cost and increases the thermal capacity of the calibration source, resulting in a decrease in the temperature control performance.

[0007] If a turbine expander is used, although the temperature of helium can be reduced, the turbine expander has a high speed, a large and complex system, and a high cost. In addition, the equipment operates slowly and has extremely poor maintainability.

[0008] Therefore, a new method is needed to transmit the cooling capacity of the calibration source. Utility Model Content

[0009] In view of the defects in the prior art, the utility model provides a helium wide temperature range temperature regulating device for infrared calibration blackbody source.

[0010] According to a helium wide temperature range temperature regulating device for infrared calibration blackbody source provided by the utility model, the scheme is as follows:

[0011] A helium wide temperature range temperature regulating device for infrared calibration black body source, the device comprising: a compressor, a helium filling port, a flow dividing device, a gas heater and a calibration source body;

[0012] Compressor: drives helium working fluid to circulate in the system;

[0013] Helium filling port: fill helium into the system;

[0014] Diverter device: Divert the helium flowing through the regenerator according to low temperature or high temperature working conditions;

[0015] Gas heater: to heat and temperature modulate the helium coming out of the splitter;

[0016] Calibration source body: receives helium gas with a certain temperature modulated by the gas heater and cools it down;

[0017] Wherein, the outlet end of the compressor is connected to the diverter device, and the helium filling port is located between the compressor and the diverter device;

[0018] The other end of the flow dividing device is connected to the gas heater, the other end of the gas heater is connected to the calibration source body, and the other end of the calibration source body is connected to the compressor inlet.

[0019] Preferably, the device further comprises: a regenerator;

[0020] The regenerator is used to recover the cold or heat of the helium gas that is about to enter the compressor, so as to prevent the operating temperature of the compressor from exceeding the allowable range and save cold or heat;

[0021] The outlet end of the compressor is connected to a regenerator, and the regenerator is connected to a flow splitter;

[0022] At the same time, the inlet end of the compressor is connected to a regenerator, and the regenerator is also connected to the calibration source body.

[0023] Preferably, the device further comprises: a buffer container;

[0024] The buffer container is used to buffer the pressure change in the system;

[0025] The buffer container and the helium filling port are connected between the compressor outlet and the regenerator.

[0026] Preferably, the flow dividing device comprises: a low-temperature gas heat exchanger inlet valve and a low-temperature gas heat exchanger;

[0027] The inlet valve of the low-temperature gas heat exchanger is connected to the regenerator and the low-temperature gas heat exchanger respectively; the other end of the low-temperature gas heat exchanger is connected to the gas heater.

[0028] Preferably, the low-temperature gas heat exchanger is also connected to a low-temperature refrigerator cold head and a low-temperature refrigerator body;

[0029] Under low temperature conditions, the low temperature gas heat exchanger is cooled by a low temperature refrigerator cold head, and the low temperature refrigerator cold head is driven to work by a low temperature refrigerator body; the low temperature refrigerator body realizes temperature control of the low temperature refrigerator cold head by frequency conversion.

[0030] Preferably, the cryogenic gas heat exchanger is further provided with a liquid nitrogen tank, a cryogenic gas heat exchanger liquid supply valve and a cryogenic gas heat exchanger liquid nitrogen exhaust port;

[0031] The liquid nitrogen tank provides liquid nitrogen to the cryogenic gas heat exchanger. After the liquid supply valve of the cryogenic gas heat exchanger is opened, the liquid nitrogen enters the cryogenic gas heat exchanger, and the excess liquid nitrogen or nitrogen gas is discharged through the liquid nitrogen exhaust port of the cryogenic gas heat exchanger.

[0032] Preferably, a one-way valve is provided between the low-temperature gas heat exchanger and the gas heater;

[0033] The helium coming out of the cryogenic gas heat exchanger passes through a one-way valve and enters the gas heater for heating.

[0034] Preferably, the diversion device further comprises:

[0035] A low-temperature gas heat exchanger bypass valve is provided between the regenerator and the gas heater;

[0036] Under high temperature conditions, close the low temperature gas heat exchanger inlet valve and open the low temperature gas heat exchanger bypass valve to allow the high temperature gas to bypass the low temperature gas heat exchanger;

[0037] Under low temperature conditions, the low temperature gas heat exchanger bypass valve is in a closed state.

[0038] Preferably, the calibration source body further comprises: a calibration source liquid nitrogen auxiliary cooling liquid nitrogen tank, a calibration source liquid nitrogen supply valve and a calibration source liquid nitrogen discharge port;

[0039] In the early stage of cooling, the liquid nitrogen in the liquid nitrogen tank is cooled by the calibration source liquid nitrogen auxiliary cooling, the calibration source liquid nitrogen supply valve is opened, the liquid nitrogen enters the calibration source body, and the excess liquid nitrogen or nitrogen gas is discharged through the calibration source liquid nitrogen discharge port.

[0040] Preferably, the calibration source body is installed in a vacuum container of a spacecraft thermal test vacuum equipment.

[0041] Compared with the prior art, the utility model has the following beneficial effects:

[0042] 1. The utility model uses helium as a medium to transmit the cold energy of a refrigerator (the lowest temperature is lower than 20K) with a lower temperature than the liquid nitrogen temperature zone (73K) to the calibration source, so that the calibration source can work in a temperature range below 50K;

[0043] 2. The utility model uses helium as the medium. At high temperatures, by setting a bypass, the high-temperature gas bypasses the cold head of the cryogenic refrigerator, thereby avoiding the traditional method of using the cold head of the refrigerator to directly contact and install on the surface of the surface source. Because the material used cannot exceed 323K for a long time, it is not adapted to the high temperature of the surface source. The calibration source can have a higher operating temperature and a longer maintenance cycle interval;

[0044] 3. The utility model uses helium as the medium to transmit low temperature, which can avoid the traditional method of directly installing the cold head of the refrigeration system such as GM refrigerator on the surface of the calibration source, which limits the installation position of the calibration source, such as the installation posture that must be close to the shell of the vacuum equipment. In this system solution, since helium enters and exits the calibration source through the pipeline, the calibration source can be installed in any position and posture in the vacuum test equipment;

[0045] 4. The utility model uses helium as the medium to transmit low temperature, which can avoid the uneven temperature of the calibration source caused by the traditional method of directly installing the cold head of the refrigeration system such as the GM refrigerator on the surface of the calibration source. Combined with the optimized design of the helium channel inside the calibration source, the number of refrigerator cold heads can be reduced on the basis of improving the uniformity of the calibration source;

[0046] 5. The utility model uses helium to transmit cold energy, and cools the helium through liquid nitrogen and a refrigerator with a lower temperature, which can make the calibration source have a more flexible control mode and a larger cooling capacity in the temperature range of 50K to 293K;

[0047] 6. The calibration source of the utility model has two pipeline systems, helium and liquid nitrogen, which can provide more functional options. Liquid nitrogen is used for auxiliary cooling in the early stage of cooling to increase the heating and cooling rate. It can also replace helium in some test occasions.

[0048] Other beneficial effects of the utility model will be explained through the introduction of specific technical features and technical solutions in the specific implementation manner. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0050] Figure 1 It is an overall schematic diagram of the utility model;

[0051] Figure 2 It is the main flow state of the system in the low temperature mode below normal temperature;

[0052] Figure 3 It is the main flow status of this system in high temperature mode exceeding 50℃.

[0053] Figure numerals: 1. compressor; 2. buffer container; 3. regenerator; 4. inlet valve of cryogenic gas heat exchanger; 5. bypass valve of cryogenic gas heat exchanger; 6. cold head of cryogenic refrigerator; 7. body of cryogenic refrigerator; 8. cryogenic gas heat exchanger; 9. liquid nitrogen tank of cryogenic gas heat exchanger; 10. liquid supply valve of cryogenic gas heat exchanger; 11. liquid nitrogen exhaust port of cryogenic gas heat exchanger; 12. one-way valve; 13. gas heater; 14. calibration source body; 15. liquid nitrogen auxiliary cooling liquid nitrogen tank of calibration source; 16. liquid supply valve of calibration source liquid nitrogen; 17. liquid nitrogen exhaust port of calibration source; 18. helium filling port; 19. vacuum container. DETAILED DESCRIPTION

[0054] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0055] The utility model embodiment provides a helium wide temperature range temperature regulating device for infrared calibration black body source, referring to Figure 1 As shown, the device specifically includes: a compressor 1, a helium filling port 18, a flow dividing device, a gas heater 13, a calibration source body 14, a regenerator 3, and a buffer container 2.

[0056] Among them, compressor 1: drives the helium working medium to circulate in the system;

[0057] Helium filling port 18: Fill helium into the system;

[0058] Diverter device: Diverts the helium gas flowing through according to low temperature or high temperature working conditions;

[0059] Gas heater 13: heating and temperature modulation of the helium coming out of the splitter;

[0060] The calibration source body 14 receives the helium gas at a certain temperature modulated by the gas heater 13 and cools it;

[0061] The outlet end of the compressor 1 is connected to the diverter device, and the helium filling port 18 is located between the compressor 1 and the diverter device; the other end of the diverter device is connected to the gas heater 13, and the other end of the gas heater 13 is connected to the calibration source body 14, and the other end of the calibration source body 14 is connected to the inlet end of the compressor 1. The calibration source body 14 is installed in the vacuum container 19 of the spacecraft thermal test vacuum equipment.

[0062] The regenerator 3 is used to recover the cold or heat of the helium that is about to enter the compressor 1, so as to prevent the operating temperature of the compressor 1 from exceeding the allowable range and save cold or heat; the outlet end of the compressor 1 is connected to the regenerator 3, and the regenerator 3 is connected to the diversion device; at the same time, the inlet end of the compressor 1 is connected to the regenerator 3, and the regenerator 3 is also connected to the calibration source body 14.

[0063] The buffer container 2 is used to buffer the pressure change in the system; the buffer container 2 and the helium filling port 18 are connected between the outlet end of the compressor 1 and the regenerator 3.

[0064] The flow diversion device includes: a low-temperature gas heat exchanger inlet valve 4 and a low-temperature gas heat exchanger 8; the low-temperature gas heat exchanger inlet valve 4 is connected to the regenerator 3 and the low-temperature gas heat exchanger 8 respectively; the other end of the low-temperature gas heat exchanger 8 is connected to the gas heater 13.

[0065] The low-temperature gas heat exchanger 8 is also connected to a low-temperature refrigerator cold head 6 and a low-temperature refrigerator body 7; under low-temperature working conditions, the low-temperature gas heat exchanger 8 is cooled by the low-temperature refrigerator cold head 6, and the low-temperature refrigerator cold head 6 is driven to work by the low-temperature refrigerator body 7; the low-temperature refrigerator body 7 realizes temperature control of the low-temperature refrigerator cold head 6 by frequency conversion.

[0066] The cryogenic gas heat exchanger 8 is also provided with a cryogenic gas heat exchanger liquid nitrogen tank 9, a cryogenic gas heat exchanger liquid supply valve 10 and a cryogenic gas heat exchanger liquid nitrogen exhaust port 11; the cryogenic gas heat exchanger liquid nitrogen tank 9 provides liquid nitrogen to the cryogenic gas heat exchanger 8, and after the cryogenic gas heat exchanger liquid supply valve 10 is opened, the liquid nitrogen enters the cryogenic gas heat exchanger 8, and the excess liquid nitrogen or nitrogen gas is discharged through the cryogenic gas heat exchanger liquid nitrogen exhaust port 11.

[0067] A one-way valve 12 is provided between the low-temperature gas heat exchanger 8 and the gas heater 13; the helium gas coming out of the low-temperature gas heat exchanger 8 passes through the one-way valve 12 and enters the gas heater 13 for heating.

[0068] The flow dividing device further comprises: a low temperature gas heat exchanger bypass valve 5 is arranged between the regenerator 3 and the gas heater 13;

[0069] Under high temperature conditions, the low temperature gas heat exchanger inlet valve 4 is closed and the low temperature gas heat exchanger bypass valve 5 is opened to allow the high temperature gas to bypass the low temperature gas heat exchanger 8; under low temperature conditions, the low temperature gas heat exchanger bypass valve 5 is in a closed state.

[0070] The calibration source body 14 also includes: a calibration source liquid nitrogen auxiliary cooling liquid nitrogen tank 15, a calibration source liquid nitrogen supply valve 16 and a calibration source liquid nitrogen discharge port 17; in the early stage of cooling, the liquid nitrogen in the liquid nitrogen tank 15 is cooled by the calibration source liquid nitrogen auxiliary cooling, the calibration source liquid nitrogen supply valve 16 is opened, the liquid nitrogen enters the calibration source body 14, and the excess liquid nitrogen or nitrogen gas is discharged through the calibration source liquid nitrogen discharge port 17.

[0071] The utility model uses helium as a medium to transmit the cold energy of a refrigerator (the lowest temperature is lower than 20K) with a lower temperature than the liquid nitrogen temperature zone (73K) to a calibration source, so that the calibration source can work in a temperature range below 50K.

[0072] With helium as the medium, at high temperatures, a bypass is set up to allow the high-temperature gas to bypass the cold head of the cryogenic refrigerator, thereby avoiding the traditional practice of using the refrigerator cold head directly in contact with the surface of the surface source. This is because the material used cannot exceed 323K for a long time, which causes the surface source to be inadaptable to the high temperature. This allows the calibration source to have a higher operating temperature and a longer maintenance cycle interval.

[0073] Using helium as the medium to transmit low temperature can avoid the traditional method of directly installing the cold head of the refrigeration system such as GM refrigerator on the surface of the calibration source, which limits the installation position of the calibration source, such as the installation posture that must be close to the vacuum equipment shell. In this system solution, since helium enters and exits the calibration source through pipelines, the calibration source can be installed in any position and posture in the vacuum test equipment.

[0074] Using helium as the medium to transmit low temperature can avoid the uneven temperature of the calibration source caused by the traditional method of directly installing the cold head of the refrigeration system such as the GM refrigerator on the surface of the calibration source. Combined with the optimized design of the helium channel inside the calibration source, the number of refrigerator cold heads can be reduced on the basis of improving the uniformity of the calibration source.

[0075] The cold energy is transmitted by helium, and the helium is cooled by liquid nitrogen and lower temperature refrigerators, which can make the calibration source have more flexible control mode and larger cooling capacity in the temperature range of 50K to 293K.

[0076] The calibration source has two pipeline systems, helium and liquid nitrogen, which can provide more functional options. Liquid nitrogen is used for auxiliary cooling in the early stage of cooling to increase the heating and cooling rate. It can also replace helium in some test occasions.

[0077] Next, the present invention will be described in more detail.

[0078] A helium wide temperature range temperature regulating device for infrared calibration blackbody source drives the helium working medium to circulate in the system through a compressor 1. When the system temperature changes, the internal pressure changes, and the pressure change is buffered by a buffer container 2 to provide system safety.

[0079] The regenerator 3 can recover the cold or heat of the helium gas that is about to enter the compressor 1, so as to prevent the operating temperature of the compressor 1 from exceeding the allowable range and save cold or heat.

[0080] The helium gas from the compressor 1 through the regenerator 3 enters the cryogenic gas heat exchanger 8 after passing through the cryogenic gas heat exchanger inlet valve 4. At this time, the cryogenic gas heat exchanger bypass valve 5 is in a closed state.

[0081] The low-temperature gas heat exchanger 8 can be cooled by a low-temperature refrigerator cold head 6, which is driven by a low-temperature refrigerator body 7 to achieve low-temperature acquisition with a minimum temperature of less than 20 K. The low-temperature refrigerator body 7 can achieve temperature control of the cold head 6 by frequency conversion and other methods.

[0082] The cryogenic gas heat exchanger 8 can also be supplied with liquid nitrogen through a liquid nitrogen tank 9 . After the cryogenic gas heat exchanger liquid supply valve 10 is opened, liquid nitrogen enters the cryogenic gas heat exchanger 8 , and excess liquid nitrogen or nitrogen gas is discharged through an exhaust port 11 .

[0083] The helium gas coming out of the cryogenic gas heat exchanger passes through the one-way valve 12 and enters the gas heater 13 for heating, and the temperature can be precisely regulated.

[0084] Under high temperature conditions, the low temperature gas heat exchanger inlet valve 4 is closed, and the low temperature gas heat exchanger bypass valve 5 is opened, so that the high temperature gas bypasses the low temperature gas heat exchanger 8, avoiding the thermal impact on the cold head 6 of the low temperature refrigerator. After the temperature and pressure of the gas in the low temperature gas heat exchanger 8 increase, the one-way valve 12 can discharge the gas from the low temperature gas heat exchanger 8 to the gas heater 13, avoiding the safety problems caused by excessive pressure. At the same time, the one-way valve 12 can prevent the high temperature gas of the gas heater 13 from flowing back into the low temperature gas heat exchanger 8 to cause the temperature rise of the cold head 6 of the low temperature refrigerator when operating at high temperature, thereby protecting the cold head 6 of the low temperature refrigerator.

[0085] The temperature-adjusted helium enters the calibration source body 14 to cool the calibration source body. The calibration source body 13 has a dual pipeline system of helium and liquid nitrogen, which can perform more flexible temperature control. In the early stage of temperature reduction, if necessary, the calibration source liquid nitrogen can also be used to assist in cooling the liquid nitrogen in the liquid nitrogen tank 15. The calibration source liquid nitrogen supply valve 16 is opened, and liquid nitrogen enters the calibration source body 13, and excess liquid nitrogen or nitrogen gas is discharged through the discharge port 17.

[0086] The helium in the system is filled through the helium filling port (valve) 18.

[0087] Since the system uses helium as the medium to transmit the calibration source in the pipeline, the calibration source body 14 can be installed in the vacuum container 19 of the spacecraft thermal test vacuum equipment in any posture and position.

[0088] The embodiment of the utility model provides a helium wide temperature range temperature control device for infrared calibration blackbody source. This temperature control system uses helium as a medium to transmit cold and heat, controls the temperature of the calibration source, meets the wide temperature range temperature control requirements of the calibration source from 50K to a higher temperature of 500K, and can enable the calibration source to be installed in a vacuum container of a spacecraft thermal test vacuum equipment in various postures and positions.

[0089] In the description of the present application, it should be understood that the terms "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 referred device or element 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.

[0090] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A helium wide temperature range temperature regulating device for infrared calibration blackbody source, characterized in that: include: A compressor (1), a helium filling port (18), a flow dividing device, a gas heater (13) and a calibration source body (14); Compressor (1): drives helium working fluid to circulate in the system; Helium filling port (18): for filling helium into the system; Diverter device: Diverts the helium gas flowing through according to low temperature or high temperature working conditions; Gas heater (13): heating and temperature modulation of the helium gas coming out of the splitter; The calibration source body (14) receives the helium gas whose temperature is adjusted by the gas heater (13) and cools it; The outlet end of the compressor (1) is connected to the flow dividing device, and the helium filling port (18) is located between the compressor (1) and the flow dividing device; The other end of the flow dividing device is connected to the gas heater (13), the other end of the gas heater (13) is connected to the calibration source body (14), and the other end of the calibration source body (14) is connected to the inlet end of the compressor (1).

2. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 1, characterized in that: The device further comprises: a regenerator (3); The regenerator (3) is used to recover the cold or heat of the helium gas that is about to enter the compressor (1), so as to prevent the operating temperature of the compressor (1) from exceeding the allowable range and save cold or heat; The outlet end of the compressor (1) is connected to a regenerator (3), and the regenerator (3) is connected to a flow splitter; At the same time, the inlet end of the compressor (1) is connected to a regenerator (3), and the regenerator (3) is also connected to a calibration source body (14).

3. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 2, characterized in that: The device further comprises: a buffer container (2); The buffer container (2) is used to buffer the pressure change in the system; The buffer container (2) and the helium filling port (18) are connected between the outlet end of the compressor (1) and the regenerator (3).

4. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 2, characterized in that: The flow dividing device comprises: a low-temperature gas heat exchanger inlet valve (4) and a low-temperature gas heat exchanger (8); The low-temperature gas heat exchanger inlet valve (4) is connected to the regenerator (3) and the low-temperature gas heat exchanger (8) respectively; the other end of the low-temperature gas heat exchanger (8) is connected to the gas heater (13).

5. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 4, characterized in that: The low-temperature gas heat exchanger (8) is also connected to a low-temperature refrigerator cold head (6) and a low-temperature refrigerator body (7); In low-temperature working conditions, the low-temperature gas heat exchanger (8) is cooled by a low-temperature refrigerator cold head (6), and the low-temperature refrigerator cold head (6) is driven to work by a low-temperature refrigerator body (7); the low-temperature refrigerator body (7) realizes temperature control of the low-temperature refrigerator cold head (6) by frequency conversion.

6. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 4 or 5, characterized in that: The cryogenic gas heat exchanger (8) is also provided with a cryogenic gas heat exchanger liquid nitrogen tank (9), a cryogenic gas heat exchanger liquid supply valve (10) and a cryogenic gas heat exchanger liquid nitrogen exhaust port (11); The cryogenic gas heat exchanger liquid nitrogen tank (9) supplies liquid nitrogen to the cryogenic gas heat exchanger (8). After the cryogenic gas heat exchanger liquid supply valve (10) is opened, the liquid nitrogen enters the cryogenic gas heat exchanger (8), and excess liquid nitrogen or nitrogen gas is discharged through the cryogenic gas heat exchanger liquid nitrogen exhaust port (11).

7. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 6, characterized in that: A one-way valve (12) is provided between the low-temperature gas heat exchanger (8) and the gas heater (13); The helium gas coming out of the low-temperature gas heat exchanger (8) passes through a one-way valve (12) and enters a gas heater (13) for heating.

8. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 4, characterized in that: The diversion device also includes: A low-temperature gas heat exchanger bypass valve (5) is provided between the regenerator (3) and the gas heater (13); Under high temperature conditions, the low temperature gas heat exchanger inlet valve (4) is closed and the low temperature gas heat exchanger bypass valve (5) is opened to allow the high temperature gas to bypass the low temperature gas heat exchanger (8); Under low temperature conditions, the low temperature gas heat exchanger bypass valve (5) is in a closed state.

9. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 1, characterized in that: The calibration source body (14) further comprises: a calibration source liquid nitrogen auxiliary cooling liquid nitrogen tank (15), a calibration source liquid nitrogen supply valve (16) and a calibration source liquid nitrogen discharge port (17); In the early stage of cooling, the liquid nitrogen in the liquid nitrogen tank (15) is cooled by auxiliary cooling with the calibration source liquid nitrogen, the calibration source liquid nitrogen supply valve (16) is opened, the liquid nitrogen enters the calibration source body (14), and the excess liquid nitrogen or nitrogen gas is discharged through the calibration source liquid nitrogen discharge port (17).

10. The helium wide temperature range temperature regulating device for infrared calibration blackbody source according to claim 1 or 9, characterized in that: The calibration source body (14) is installed in a vacuum container (19) of a spacecraft thermal test vacuum device.

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