阅读说明：本技术 一种制冷机制冷量快速测试装置 (Quick testing arrangement of refrigerator refrigerating output ) 是由 王兆利 陈厚磊 梁惊涛 赵密广 于 2020-06-02 设计创作，主要内容包括：本发明涉及机械式低温制冷机测试领域,公开了一种制冷机制冷量快速测试装置,包括：真空罩、加热元件和测温元件,真空罩的罩口用于与制冷机的冷指的一端密封连接,还包括：导温件和绝热连接件；导温件内置于真空罩中,并用于与冷指的另一端相抵接,导温件上设置加热元件与测温元件；绝热连接件的一端连接导温件,绝热连接件的另一端连接真空罩；本发明结构简单、操作时效性高,可以相同的状态面向不同制冷机的制冷量测试,确保了测试的一致性和可重复性,提高了测试效率,尤其适用于对批量的脉冲管制冷机的制冷量进行快速测试。(The invention relates to the field of testing of mechanical low-temperature refrigerators, and discloses a device for quickly testing refrigerating capacity of a refrigerator, which comprises: vacuum cover, heating element and temperature element, the cover mouth of vacuum cover is used for with the one end sealing connection of the cold finger of refrigerator, still includes: a thermal conductor and a thermal insulation connector; the temperature conduction piece is arranged in the vacuum cover and is used for abutting against the other end of the cold finger, and a heating element and a temperature measuring element are arranged on the temperature conduction piece; one end of the heat insulation connecting piece is connected with the heat conducting piece, and the other end of the heat insulation connecting piece is connected with the vacuum cover; the pulse tube refrigerator refrigerating capacity testing device is simple in structure and high in operation timeliness, refrigerating capacity tests of different refrigerators can be performed in the same state, testing consistency and repeatability are guaranteed, testing efficiency is improved, and the pulse tube refrigerator refrigerating capacity testing device is particularly suitable for rapidly testing the refrigerating capacity of pulse tube refrigerators in batches.)

1. A quick testing arrangement of refrigerator refrigerating capacity includes: vacuum cover, heating element and temperature element, the cover mouth of vacuum cover is used for with the one end sealing connection of refrigerator's cold finger, its characterized in that still includes: a thermal conductor and a thermal insulation connector;

the temperature conduction piece is arranged in the vacuum cover and is used for abutting against the other end of the cold finger, and the heating element and the temperature measuring element are arranged on the temperature conduction piece;

one end of the heat insulation connecting piece is connected with the heat conduction piece, and the other end of the heat insulation connecting piece is connected with the vacuum cover.

2. The refrigerating machine refrigerating capacity rapid test device according to claim 1, wherein one end of the temperature conduction member is integrated with the heating element and the temperature measurement element, and the other end is provided with a mounting position matched with the other end of the cold finger; and/or the heat insulation connecting piece is an elastic component.

3. The refrigerating machine refrigerating capacity rapid test device according to claim 2, wherein the temperature conduction member comprises a cold cap for cold conduction, the heating element and the temperature measurement element are integrated on the top of the cold cap, and the opening of the cold cap is the installation position.

4. The device for rapidly testing the refrigerating capacity of the refrigerating machine as claimed in claim 3, wherein the outer side wall of the cold cap is coated with a heat insulating layer, and the heat insulating layer is provided with a plurality of air holes.

5. The refrigerating machine refrigerating capacity rapid test device according to claim 2, further comprising: an interface seat; one port of the interface seat is hermetically connected with a cover opening of the vacuum cover, the other port of the interface seat is used for being hermetically connected with one end of the cold finger, a vacuum socket is arranged on the side wall of the interface seat, and the vacuum socket is respectively and electrically connected with the heating element and the temperature measuring element;

the other end of the heat insulation connecting piece is connected with the interface seat.

6. The refrigerating machine refrigerating capacity rapid test device according to claim 5, further comprising: a support frame; one end of the support frame extends into the vacuum cover, and the other end of the support frame is connected with the interface seat;

the heat insulation connecting piece comprises a plurality of groups of stay wire assemblies which are arranged along the circumference, one end of each stay wire assembly is connected with the heat conducting piece, the middle part of each stay wire assembly is connected with the guide structure on the supporting frame in a sliding manner, and the other end of each stay wire assembly is connected with the interface seat;

the temperature conduction piece is isolated from the support frame.

7. The refrigerating machine refrigerating capacity rapid testing device according to claim 6, wherein the stay wire assemblies are uniformly arranged in a circumference manner relative to the central axis of the vacuum cover, and the center of the temperature conduction member is coincident with the central axis of the vacuum cover;

and/or, the wire pulling assembly comprises: the device comprises a first Kevlar wire, a pre-tightening spring and a second Kevlar wire; the guide structure comprises a threading hole or a carrying groove; one end of the first Kevlar wire is connected with the temperature conducting piece, the middle part of the first Kevlar wire is connected with the guiding structure in a sliding mode, the other end of the first Kevlar wire is connected with one end of the pre-tightening spring, the other end of the pre-tightening spring is connected with one end of the second Kevlar wire, and the other end of the second Kevlar wire is connected with the interface seat.

8. The refrigerating machine refrigerating capacity rapid test device according to claim 7, wherein the support frame comprises: a support ring and a vertical link; the support ring and the central axis of the vacuum cover are coaxially arranged, and a plurality of guide structures are uniformly distributed on the support ring along the circumference; the vertical connecting rods comprise a plurality of connecting rods, one end of each vertical connecting rod is connected with the support ring, and the other end of each vertical connecting rod is connected with the interface seat.

9. The refrigerating machine refrigerating capacity rapid test device according to any one of claims 1 to 8, wherein the heating element and the temperature measuring element are both adhered to the temperature guide member, the heating element includes a heating sheet or a heating wire, and the temperature measuring element includes a temperature sensor.

Technical Field

The invention relates to the field of testing of mechanical low-temperature refrigerators, in particular to a device for quickly testing refrigerating capacity of a refrigerator.

Background

The mechanical cryogenic refrigerator includes a pulse tube refrigerator, a stirling refrigerator, a G-M refrigerator, and the like. The pulse tube refrigerator is a great innovation of the regenerative cryocooler, and cancels a cold end discharger widely applied to the conventional regenerative cryocooler (a Stirling refrigerator or a G-M refrigerator), and uses the operation of a hot end phase modulation mechanism to realize the phase difference required by refrigeration. The pulse tube refrigerator has the characteristics of low vibration and long durability, and is more and more widely applied to refrigeration of the infrared detector.

Refrigeration capacity is one of the key parameters that characterize the performance of a pulse tube refrigerator. At present, the refrigerating capacity of the pulse tube refrigerator is tested by arranging a heating element and a temperature measuring element on a cold finger of the pulse tube refrigerator, wherein the heating element is a heating wire which is manually wound on the cold finger or a heating sheet which is stuck on the cold finger, the temperature measuring element is a temperature sensor, then, the cold finger is coated with a plurality of layers of heat insulating materials and is arranged in a vacuum cover, and the cover opening of the vacuum cover is ensured to be sealed with one end corresponding to the cold finger. After the Dewar pumping port on the vacuum cover is vacuumized, the refrigerating capacity test of the pulse tube refrigerator can be carried out. The test mode can meet the test requirement of small batch, but has obvious defects: when the pulse tube refrigerator is subjected to refrigerating capacity test every time, the heating element, the temperature measuring element and the multi-layer heat insulating material are required to be manually installed on the cold finger, the whole operation process is long in time consumption and poor in consistency, so that certain deviation occurs in the refrigerating capacity test of the pulse tube refrigerator, the repeatability of the test operation is poor, and the performance characterization of the pulse tube refrigerator in batch production is unfavorable.

Disclosure of Invention

The embodiment of the invention provides a device for rapidly testing refrigerating capacity of a refrigerating machine, which is used for solving the problems that the existing refrigerating capacity test of the refrigerating machine is complex in operation, poor in test consistency and repeatability and difficult to realize batch test.

In order to solve the above technical problem, an embodiment of the present invention provides a device for rapidly testing a refrigerating capacity of a refrigerating machine, including: the cover mouth of the vacuum cover is used for being connected with one end of a cold finger of the refrigerator in a sealing way, and the refrigerator further comprises: a thermal conductor and a thermal insulation connector; the temperature conduction piece is arranged in the vacuum cover and is used for abutting against the other end of the cold finger, and the heating element and the temperature measuring element are arranged on the temperature conduction piece; one end of the heat insulation connecting piece is connected with the heat conduction piece, and the other end of the heat insulation connecting piece is connected with the vacuum cover.

One end of the temperature conduction piece is integrated with the heating element and the temperature measurement element, and the other end of the temperature conduction piece is provided with a mounting position matched with the other end of the cold finger; and/or the heat insulation connecting piece is an elastic component.

The temperature conduction piece comprises a cold cap for cold conduction, the heating element and the temperature measurement element are integrated on the cap top of the cold cap, and the cap opening of the cold cap is the installation position.

The outer side wall of the cold cap is coated with a heat insulation layer, and the heat insulation layer is provided with a plurality of air holes.

Wherein, still include: an interface seat; one port of the interface seat is hermetically connected with a cover opening of the vacuum cover, the other port of the interface seat is used for being hermetically connected with one end of the cold finger, a vacuum socket is arranged on the side wall of the interface seat, and the vacuum socket is respectively and electrically connected with the heating element and the temperature measuring element; the other end of the heat insulation connecting piece is connected with the interface seat.

Wherein, still include: a support frame; one end of the support frame extends into the vacuum cover, and the other end of the support frame is connected with the interface seat; the heat insulation connecting piece comprises a plurality of groups of stay wire assemblies which are arranged along the circumference, one end of each stay wire assembly is connected with the heat conducting piece, the middle part of each stay wire assembly is connected with the guide structure on the supporting frame in a sliding manner, and the other end of each stay wire assembly is connected with the interface seat; the temperature conduction piece is isolated from the support frame.

The stay wire assemblies are uniformly distributed in a circumferential manner relative to the central axis of the vacuum cover, and the center of the temperature conduction piece is superposed with the central axis of the vacuum cover; and/or, the wire pulling assembly comprises: the device comprises a first Kevlar wire, a pre-tightening spring and a second Kevlar wire; the guide structure comprises a threading hole or a carrying groove; one end of the first Kevlar wire is connected with the temperature conducting piece, the middle part of the first Kevlar wire is connected with the guiding structure in a sliding mode, the other end of the first Kevlar wire is connected with one end of the pre-tightening spring, the other end of the pre-tightening spring is connected with one end of the second Kevlar wire, and the other end of the second Kevlar wire is connected with the interface seat.

Wherein, the support frame includes: a support ring and a vertical link; the support ring and the central axis of the vacuum cover are coaxially arranged, and a plurality of guide structures are uniformly distributed on the support ring along the circumference; the vertical connecting rods comprise a plurality of connecting rods, one end of each vertical connecting rod is connected with the support ring, and the other end of each vertical connecting rod is connected with the interface seat.

The heating element and the temperature measuring element are both stuck on the temperature guide piece, the heating element comprises a heating sheet or a heating wire, and the temperature measuring element comprises a temperature sensor.

One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

according to the device for rapidly testing the refrigerating capacity of the refrigerating machine, the heating element and the temperature measuring element are arranged on the temperature guide piece, the temperature guide piece is arranged in the vacuum cover through the heat insulation connecting piece, the heat insulation connecting piece provides efficient heat insulation support for the temperature guide piece in a low-temperature environment, when the refrigerating machine is tested for the refrigerating capacity, only the cold finger of the refrigerating machine needs to be inserted into the vacuum cover, one end of the cold finger is connected with the cover opening of the vacuum cover in a sealing mode, the other end of the cold finger is abutted against the temperature guide piece, therefore, after the vacuum cover is vacuumized, the refrigerating capacity of the refrigerating machine can be tested through the heating element and the temperature measuring element based on the conduction effect of the temperature guide piece on the refrigerating capacity of the cold finger, and the accuracy of a test result can be ensured.

Therefore, the pulse tube refrigerator refrigerating capacity testing device is simple in structure and high in operation timeliness, the cold finger of the refrigerator can be measured after being inserted into the vacuum cover, the problem that a heating element, a temperature measuring element and a multi-layer heat insulating material are required to be manually installed on the cold finger when the refrigerating capacity of the refrigerator is tested at each time is solved, the refrigerating capacity of different refrigerators can be tested in the same state, the testing consistency and repeatability are ensured, the testing efficiency is improved, and the pulse tube refrigerator refrigerating capacity testing device is particularly suitable for quickly testing the refrigerating capacity of pulse tube refrigerators in batches.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a first view angle of a refrigerating machine refrigerating capacity rapid test device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the cross-sectional structure A-A of FIG. 1 according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram (not including a vacuum cover) of a second view angle of the refrigerating machine refrigerating capacity rapid test apparatus according to the embodiment of the present invention;

fig. 4 is a schematic top view of fig. 3 according to an embodiment of the present invention.

In the figure, 1, a vacuum hood; 2. a Dewar pumping port; 3. cold fingers; 4. a temperature conducting member; 5. a heating element; 6. a temperature measuring element; 7. an interface seat; 8. a vacuum socket; 9. a support frame; 91. a support ring; 92. a vertical connecting rod; 10. a pull wire assembly; 101. a first Kevlar line; 102. pre-tightening the spring; 103. a second Kevlar line.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present embodiment provides a device for rapidly testing a refrigerating capacity of a refrigerating machine, including: vacuum cover 1, heating element 5 and temperature element 6, the cover mouth of vacuum cover 1 is used for with the one end sealing connection of refrigerator's cold finger 3, still includes: a temperature conduction piece 4 and a heat insulation connecting piece; the temperature conduction piece 4 is arranged in the vacuum cover 1 and is used for abutting against the other end of the cold finger 3, and the heating element 5 and the temperature measurement element 6 are arranged on the temperature conduction piece 4; one end of the heat insulation connecting piece is connected with the heat conduction piece 4, and the other end of the heat insulation connecting piece is connected with the vacuum cover 1.

The refrigerating machine refrigerating capacity rapid testing device shown in the embodiment is characterized in that the heating element 5 and the temperature measuring element 6 are arranged on the temperature guide piece 4, the temperature guide piece 4 is installed in the vacuum cover 1 through the heat insulation connecting piece, the heat insulation connecting piece provides efficient heat insulation support for the temperature guide piece 4 in a low-temperature environment, when the refrigerating machine is subjected to refrigerating capacity testing, only the cold finger 3 of the refrigerating machine needs to be inserted into the vacuum cover 1, one end of the cold finger 3 is in sealing connection with the cover opening of the vacuum cover 1, the other end of the cold finger is in butt joint with the temperature guide piece 4, after the vacuum cover 1 is vacuumized, the refrigerating capacity rapid testing device can be based on the conduction effect of the temperature guide piece 4 on the cold finger 3, the refrigerating capacity of the refrigerating machine is tested through the heating element 5 and the temperature measuring element 6, and the accuracy of a testing result can be ensured.

It should be noted that the above-described testing apparatus shown in this embodiment may be constructed as a vacuum dewar as is well known in the art, and a dewar drawing port 2 is provided on the vacuum enclosure 1. The refrigerator shown in the present embodiment may be a pulse tube refrigerator, a stirling refrigerator, a G-M refrigerator, or the like, and is not particularly limited herein, but the present embodiment is particularly applicable to a pulse tube refrigerator, in which a flange is provided at one end of the cold finger 3 of the pulse tube refrigerator, and a sealing connection with the cover opening of the vacuum cover 1 can be realized based on the flange. The temperature guiding element 4 can be understood as a component made of a heat conducting material with good heat conductivity, so as to conduct the refrigerating capacity on the cold finger 3, thereby facilitating the corresponding tests of the heating element 5 and the temperature measuring element 6 on the temperature guiding element 4, wherein both the heating element 5 and the temperature measuring element 6 can be adhered on the temperature guiding element 4 and are electrically isolated from the temperature guiding element 4, the heating element 5 comprises a heating sheet or a heating wire, and the temperature measuring element 6 comprises a temperature sensor or a cylindrical thermometer.

Meanwhile, the heat insulation connector may be understood as a member made of a heat insulating material known in the art for installing the temperature conduction member 4 in the vacuum housing 1 and isolating it from the inner wall of the vacuum housing 1, wherein the portion of the other end of the heat insulation connector connected to the vacuum housing 1 may be the top and inner walls of the vacuum housing 1 or may be connected to the vacuum housing 1 through other intermediate members, and is not particularly limited herein.

Preferably, in this embodiment, one end of the thermal conductive member 4 integrates the heating element 5 and the temperature measuring element 6, and the other end is provided with a mounting position adapted to the other end of the cold finger 3; and/or the heat insulation connecting piece is an elastic component.

Specifically, the mounting position shown in this embodiment may be a groove or a clamping groove, the shape of the corresponding notch or bayonet of the mounting position may be circular, triangular, square, or the like, and specifically, the adaptive design may be performed according to the cross-sectional shape of the cold finger 3. So, based on the setting of installation position, both be convenient for realize leading installation and location between the other end of temperature 4 and cold finger 3, can ensure leading the abundant contact between the other end of temperature 4 and cold finger 3 again, thereby when adiabatic connecting piece establishes to the elastic component, still can be based on the elastic force that adiabatic connecting piece provided, ensure leading temperature 4 and the other end in close contact with of cold finger 3, can effectively reduce the refrigeration volume and at the produced cold volume loss of the conduction in-process from cold finger 3 to leading temperature 4, and then can ensure the accuracy of testing result.

In one preferred embodiment, as shown in fig. 2, the temperature conduction member 4 comprises a cold cap for cold conduction, and the heating element 5 and the temperature measurement element 6 are integrated on the top of the cold cap, and the opening of the cold cap is the installation position shown in the previous embodiment.

Therefore, when the cold finger device is used, when the cover opening of the vacuum cover 1 is in sealing connection with one end of the cold finger 3, the other end of the cold finger 3 can be very conveniently inserted into the cover opening of the cold cap, and good contact connection is realized between the cover opening and the cold finger 3, so that the refrigerating capacity can be conveniently and quickly conducted from the cold finger 3 to the cold cap. In order to prevent the conduction loss of the refrigerating capacity, the outer side wall of the cold cap can be coated with a layer of heat insulation layer, the heat insulation layer can be composed of multiple layers of heat insulation materials, the outer side wall of the cold cap can be free from exposure, and therefore corresponding test tests can be accurately carried out based on the heating element 5 and the temperature measuring element 6 of the cold cap top. Meanwhile, a plurality of air holes can be formed in the heat insulation layer, so that residual gas in the heat insulation layer can be discharged in time when the Dewar pumping hole 2 on the vacuum cover 1 is used for vacuumizing.

As shown in fig. 1 and 2, in a further preferred embodiment, an interface seat 7 may be further provided, one port of the interface seat 7 is hermetically connected with the cover opening of the vacuum cover 1, the other port of the interface seat 7 is hermetically connected with one end of the cold finger 3, a vacuum socket 8 is mounted on a side wall of the interface seat 7, and the vacuum socket 8 is electrically connected with the heating element 5 and the temperature measuring element 6 respectively.

Specifically, when the cover opening of the vacuum cover 1 is arranged vertically downward, a first sealing ring can be installed on the cover opening of the vacuum cover 1 to realize contact sealing with the upper side port of the interface seat 7, and the cover opening of the vacuum cover 1 and the upper side port of the interface seat 7 can be fastened through a screw or a locking bolt. Thus, the vacuum cap 1 and the mouthpiece 7 can be integrated, and need not be attached and detached during the test.

Correspondingly, when the test is carried out, because one end of the cold finger 3 is provided with the flange plate, a second sealing ring can be arranged at the lower side port of the interface seat 7, the second sealing ring is used for realizing contact sealing with the flange plate, and the lower side port of the interface seat 7 and the corresponding flange plate on the cold finger 3 can be fastened through the locking bolt. Therefore, the flange plate based on one end of the vacuum cover 1 and the cold finger 3 forms a closed environment, after the vacuum pumping treatment is carried out through the Dewar pumping port 2 on the vacuum cover 1, the vacuum socket 8 is respectively and electrically connected with the heating element 5 and the temperature measuring element 6, so that the vacuum socket 8 can be connected with the test bench through a data transfer line, and corresponding test and data monitoring can be carried out on the test bench.

It should be noted that, both the first sealing ring and the second sealing ring may be O-shaped sealing rings, and further, the present embodiment is further provided with a supporting frame 9 based on the interface seat 7; one end of the supporting frame 9 extends into the vacuum cover 1, and the other end of the supporting frame 9 is connected with the interface seat 7; the heat insulation connecting piece comprises a plurality of groups of stay wire assemblies 10 which are arranged along the circumference, one end of each stay wire assembly 10 is connected with the heat conducting piece 4, the middle part of each stay wire assembly 10 is connected with the guide structure on the supporting frame 9 in a sliding manner, and the other end of each stay wire assembly 10 is connected with the interface seat 7; wherein, guide structure includes through wires hole or carries on the groove, and guide structure provides the holding power to wire drawing subassembly 10 on the one hand on support frame 9, and on the other hand still leads to the pulling force on the wire drawing subassembly 10 to based on interface seat 7, can be applyed along circumferential pulling force to leading temperature piece 4 simultaneously by multiunit wire drawing subassembly 10, make leading temperature piece 4 hang in vacuum hood 1, isolated with support frame 9 simultaneously.

As shown in fig. 3 and 4, three groups of the wire pulling assemblies 10 can be arranged, and the three groups of the wire pulling assemblies 10 are uniformly arranged in a circumference direction relative to the central axis of the vacuum housing 1. As can be seen from the above embodiments, the temperature conduction member 4 is preferably a cold cap, and the center of the cold cap can be overlapped with the central axis of the vacuum housing 1, i.e. the cold cap is ensured to be at the center position in the vacuum housing 1.

For each set of wire assemblies 10, as shown in fig. 3, it includes a first kevlar wire 101, a pre-tensioned spring 102, and a second kevlar wire 103; one end of the first Kevlar wire 101 is connected with the top of the cold cap, the middle part of the first Kevlar wire 101 is connected with a guide structure in a sliding mode, the guide structure is preferably a threading hole or a carrying groove, the middle part of the first Kevlar wire 101 can penetrate through the threading hole, or the middle part of the first Kevlar wire 101 is carried in the carrying groove, and in order to prevent the first Kevlar wire 101 from being damaged by the edge of the threading hole or the carrying groove in the sliding process of the first Kevlar wire 101, the edge of the threading hole or the carrying groove can be subjected to chamfering treatment; meanwhile, the other end of the first kevlar line 101 is connected to one end of the pretension spring 102, the other end of the pretension spring 102 is connected to one end of the second kevlar line 103, and the other end of the second kevlar line 103 is connected to the mouthpiece 7, whereby the cold cap can be mounted in the vacuum housing 1 and suspended at the center position of the vacuum housing 1 based on the mouthpiece 7, the support frame 9, and the line assembly 10.

Because the first Kevlar wire 101 and the second Kevlar wire 103 both have good heat insulation characteristics, and the pre-tightening spring 102 can provide elastic pre-tightening force, the wire assembly 10 not only has heat insulation characteristics, but also has certain elastic deformation, therefore, the installation position of the cold cap can be adjusted by matching a plurality of groups of wire assemblies 10, the cold cap is positioned at the central position of the vacuum cover 1 and is in close contact fit with the cold finger, and meanwhile, the cold quantity on the cold cap is prevented from being diffused to the vacuum cover 1 and other carrying structures.

Meanwhile, as for the support frame 9, as shown in fig. 3, it includes a support ring 91 and a vertical link 92; the support ring 91 and the central axis of the vacuum housing 1 can be arranged coaxially, and the above-mentioned plurality of guide structures are uniformly distributed on the support ring 91 along the circumference; the upper ends of the plurality of vertical links 92 are connected to the horizontally arranged support ring 91, and the lower ends of the vertical links 92 are connected to the interface seat 7, wherein the support frame 9 and the interface seat 7 can be integrated. Therefore, the overall structural stability of the support frame 9 is ensured, and meanwhile the support ring 91 on the support frame 9 and the vacuum cover 1 are coaxially arranged, so that the cold cap can be uniformly applied with circumferential tension based on the support ring 91 and a plurality of groups of stay wire assemblies 10 with heat insulation functions, the cold cap is suspended at the center of the vacuum cover 1, and when the other end of the cold finger 3 is inserted into the cap opening of the cold cap, the tightness of connection between the cold finger 3 and the cold cap can be ensured based on the elastic pretightening force provided by the stay wire assemblies 10, and the accuracy of a test result can be ensured.

Therefore, the testing device shown in the embodiment has the advantages that the structure is simple, the operation timeliness is high, the cold finger 3 of the refrigerator can be measured after being inserted into the vacuum cover 1, the problem that the heating element 5, the temperature measuring element 6 and the multi-layer heat insulation material are required to be manually installed on the cold finger 3 when the refrigerating capacity of the refrigerator is tested at each time is solved, the refrigerating capacity tests of different refrigerators can be performed in the same state, the testing consistency and repeatability are ensured, the testing efficiency is improved, and the refrigerating capacity tests of pulse tube refrigerators in batches can be rapidly performed.

Finally, it should be noted that the pulse tube refrigerator of the present embodiment can provide a reliable vacuum cryogenic environment for the focal length measurement of the transmissive cryooptical system during actual operation, and thus provide guidance for the adjustment of the cryooptical system.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.