Cold loss testing device

Abstract

The utility model discloses a cold loss testing device. The cold loss testing device comprises a first weighing part, a supporting seat, a mounting part, a liquid storage tank and a liquid supply assembly, the supporting seat is arranged on the first weighing piece, and the supporting seat is used for supporting the Dewar; the mounting piece is configured to be connected with and separated from the supporting seat; the liquid supply assembly is connected with the liquid storage tank, the output end of the liquid supply assembly is connected with the mounting part, and when the mounting part is connected with the supporting seat, the output end of the liquid supply assembly is communicated with the outer cavity of the Dewar. The Dewar is placed on the supporting seat, then the mounting piece is connected with the supporting seat, and liquid nitrogen is input into the outer cavity of the Dewar through the liquid supply assembly. And then the supporting seat is weighed through the first weighing piece, and the weight change of the supporting seat is recorded, so that the Dewar cold loss is calculated according to the weight change. Due to the fact that the liquid nitrogen in the liquid storage tank is conveyed to the outer cavity of the Dewar through the liquid supply assembly, the liquid nitrogen does not need to be poured into the Dewar by holding a liquid nitrogen container manually, the situation that the liquid nitrogen splashes is avoided, personal injury is not prone to being caused, and operation safety is improved.

Description

Technical Field

[0001] This application belongs to the field of cryogenic vacuum engineering technology, specifically relating to a cold loss testing device. Background Technology

[0002] Dewars are a crucial component of cryogenic detectors, providing a low-temperature vacuum environment for infrared chips. To ensure the accuracy of infrared detection, cryogenic detectors require Dewars with very high vacuum levels, and one indicator of a Dewar's vacuum level is its cold loss. Existing cold loss testing devices typically involve manually pouring liquid nitrogen into the testing apparatus, which can easily lead to liquid nitrogen splashes and cause injury. Utility Model Content

[0003] The technical problem this application aims to solve is that existing cold loss testing devices, which involve manually pouring liquid nitrogen, are prone to liquid nitrogen splashing, causing personal injury. To solve this technical problem, this application provides a cold loss testing device that can avoid liquid nitrogen splashing.

[0004] The technical solution proposed in this application is as follows:

[0005] A cold loss testing device, comprising:

[0006] First weighing item;

[0007] A support base is disposed on the first weighing element, and the support base is used to support the Dewar;

[0008] The mounting element is configured to connect and disconnect from the support base;

[0009] A liquid storage tank and a liquid supply assembly are provided. The liquid storage tank stores liquid nitrogen, and the liquid supply assembly is connected to the liquid storage tank. The output end of the liquid supply assembly is connected to the mounting component. When the mounting component is connected to the support base, the output end of the liquid supply assembly communicates with the outer cavity of the Dewar to deliver the liquid nitrogen in the liquid storage tank to the outer cavity of the Dewar.

[0010] Using the aforementioned cold loss testing device, the Dewar is placed on a support base, and then the mounting component is connected to the support base, so that the output end of the liquid supply component is connected to the outer cavity of the Dewar. Liquid nitrogen is then introduced into the outer cavity of the Dewar through the liquid supply component. Next, the support base is weighed using a first weighing device, and the weight change of the support base is recorded. The cold loss of the Dewar is then calculated based on the weight change. Since the liquid nitrogen in the storage tank is delivered to the outer cavity of the Dewar through the liquid supply component, there is no need for manual pouring of the liquid nitrogen container, eliminating the risk of liquid nitrogen splashing and thus reducing the risk of injury to personnel, thereby improving operational safety.

[0011] Furthermore, the liquid supply assembly includes a delivery module and a delivery pipeline. The delivery module is disposed in the liquid storage tank and connected to the delivery pipeline to deliver liquid nitrogen in the liquid storage tank to the delivery pipeline. The output end of the delivery pipeline is connected to the mounting component.

[0012] Furthermore, the conveying module includes a conveying valve and a conveying pump, the conveying valve being connected to the liquid storage tank, and the conveying pump being connected between the conveying valve and the conveying pipeline.

[0013] Furthermore, the liquid supply assembly also includes a flow regulator, which is disposed in the delivery pipeline.

[0014] Furthermore, the liquid supply assembly also includes a temperature detector, which is disposed in the delivery pipeline.

[0015] Furthermore, the liquid supply assembly also includes a pressure detector, which is disposed in the delivery pipeline.

[0016] Furthermore, the cold loss testing device also includes a second weighing element, and the liquid storage tank is disposed on the second weighing element.

[0017] Furthermore, both the support base and the mounting component are made of heat-insulating material.

[0018] Furthermore, when the mounting component is connected to the support base, the mounting component and the support base enclose a test cavity, the test cavity is connected to the outer cavity of the Dewar, and the output end of the liquid supply assembly extends into the test cavity.

[0019] Furthermore, the mounting component is threaded or snapped into the support seat.

[0020] The cold loss testing device provided in this application has at least the following advantages:

[0021] 1. Liquid nitrogen is introduced into the outer cavity of the Dewar through the liquid supply components, namely the delivery valve, delivery pump and delivery pipeline, which can avoid liquid nitrogen splashing and improve the safety of operation;

[0022] 2. A test chamber is formed between the mounting component and the support base, and the output end of the delivery pipe extends into the test chamber. Both the support base and the mounting component are made of heat-insulating material, which can avoid the influence of the external ambient temperature on the Dewar cold loss test and improve the test accuracy.

[0023] 3. A second weighing device is installed under the liquid storage tank. By comparing the data from the three devices, it can be determined whether the liquid supply component is leaking, thereby improving the reliability of the device.

[0024] 4. Installing temperature and pressure detectors on the delivery pipeline can determine whether the liquid nitrogen meets the requirements and also determine whether the liquid supply components are malfunctioning, thereby improving the reliability of the equipment. Attached Figure Description

[0025] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0026] Figure 1 This is a schematic diagram of the structure of a cold loss testing device provided in an embodiment of this application.

[0027] Label Explanation:

[0028] 110. First weighing element; 120. Support base; 130. Mounting component; 131. Test chamber; 140. Liquid storage tank; 150. Liquid supply assembly; 151. Conveying module; 152. Conveying pipeline; 160. Sealing cover; 170. Second weighing element. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] like Figure 1 As shown, one embodiment of this application provides a cold loss testing device, including a first weighing component 110, a support base 120, a mounting component 130, a liquid storage tank 140, and a liquid supply assembly 150.

[0032] A support 120 is disposed on a first weighing element 110 for weighing the support 120 and the structure on it. The support 120 supports the Dewar; a mounting element 130 is configured to connect to and disconnect from the support 120. A storage tank 140 stores liquid nitrogen, and a liquid supply assembly 150 is connected to the storage tank 140, with its output end connected to the mounting element 130. When the mounting element 130 is connected to the support 120, the output end of the liquid supply assembly 150 communicates with the outer cavity of the Dewar, thereby supplying liquid nitrogen from the storage tank 140 to the outer cavity of the Dewar via the liquid supply assembly 150.

[0033] Using the aforementioned cold loss testing device, the Dewar is placed on the support base 120, and then the mounting component 130 is connected to the support base 120, so that the output end of the liquid supply component 150 is connected to the outer cavity of the Dewar, and liquid nitrogen is input into the outer cavity of the Dewar through the liquid supply component 150. Next, the support base 120 is weighed by the first weighing component 110, and the weight change of the support base 120 is recorded, thereby calculating the cold loss of the Dewar based on the weight change. Since the liquid nitrogen in the storage tank 140 is delivered to the outer cavity of the Dewar through the liquid supply component 150, there is no need for manual pouring of the liquid nitrogen container, and there is no risk of liquid nitrogen splashing, thus reducing the risk of personal injury and improving operational safety.

[0034] It should be noted that after the preset amount of liquid nitrogen is poured into the outer cavity of the Dewar, the weight change is recorded by the first weighing device 110, and the time corresponding to the weight change can be recorded by the host computer. Then, the cold loss of the Dewar is calculated by formula 1.

[0035] Q = 1000 × R × △M / △T (1)

[0036] Where Q is the cooling loss of the Dewar, in mW; R is the latent heat of vaporization of liquid nitrogen, R = 197.6 J / g; ΔM is the weight change of liquid nitrogen, in g; and ΔT is the time corresponding to the weight change of liquid nitrogen, in seconds. After calculating the cooling loss, it can be compared with the standard value. If it is less than the standard value, the Dewar is considered qualified; otherwise, it is considered unqualified.

[0037] Therefore, it can be determined that the first weighing component 110 is a high-precision weighing instrument. The support base 120 is placed on the weighing instrument, and a sealing cover 160 can be provided. The sealing cover 160 covers the support base 120 and the weighing instrument. The output end of the liquid supply component 150 extends through the sealing cover 160 and into the sealing cover 160, and is connected to the mounting component 130. Optionally, the weighing instrument can be a high-precision electronic scale or other weighing structure. Furthermore, the liquid supply component 150 and the sealing cover 160 need to be in sealed contact to prevent nitrogen leakage.

[0038] Furthermore, the sealing cover 160 can also be connected to a gas replacement mechanism to replace the residual nitrogen gas inside the sealing cover 160 after the cold loss test is completed, so as to avoid excessive nitrogen concentration near the cold loss test device and thus ensure the safety of the operators.

[0039] In one embodiment, the cold loss testing device further includes a second weighing element 170, with the liquid storage tank 140 disposed on the second weighing element 170, so as to detect the weight of the liquid storage tank 140 through the second weighing element 170, thereby obtaining the weight change of liquid nitrogen in the liquid storage tank 140.

[0040] Understandably, by comparing the weight changes of the first weighing device 110 and the second weighing device 170, it can be determined whether the liquid supply assembly 150 is leaking. For example, if the two data are close or the same, it can be determined that the liquid supply assembly 150 is not leaking; if the two data differ significantly, typically the weight change measured by the first weighing device 110 is less than the weight change measured by the second weighing device 170, it indicates that the liquid supply assembly 150 is leaking and needs to be inspected and repaired. Of course, the second weighing device 170 can also be used to determine whether the liquid storage tank 140 is leaking. Optionally, the second weighing device 170 also uses the same weighing instrument as the first weighing device 110.

[0041] In one embodiment, both the support 120 and the mounting component 130 are made of thermal insulation material to reduce the influence of ambient temperature on the Dewar cold loss test and improve test accuracy. It should be noted that the thermal insulation material is an existing material, and those skilled in the art can select suitable thermal insulation materials as needed, such as porous ceramics, etc., without limitation.

[0042] In one embodiment, when the mounting component 130 is connected to the support base 120, the mounting component 130 and the support base 120 together form a test chamber 131. The test chamber 131 communicates with the outer cavity of the Dewar, and the output end of the liquid supply component 150 extends into the test chamber 131 to communicate with the outer cavity of the Dewar. By forming the test chamber 131, gas flow between the test chamber 131 and the external environment can be isolated to a certain extent, further avoiding the influence of the external environment on the cold loss test and improving the test accuracy. Of course, the test chamber 131 is not completely sealed to ensure that the vaporized nitrogen can escape.

[0043] Optionally, the mounting member 130 is threaded or snapped into the support 120. For example, a threaded protrusion is provided on the top of the support 120, and the mounting member 130 has an open cavity with an internal thread on the inner wall of the open cavity that mates with the threaded protrusion. The mounting member 130 is threaded into the threaded protrusion, thereby forming a test cavity 131 with the support 120.

[0044] In one embodiment, the liquid supply assembly 150 includes a delivery module 151 and a delivery pipe 152. The delivery module 151 is disposed in the liquid storage tank 140 and connected to the delivery pipe 152 to deliver liquid nitrogen from the liquid storage tank 140 to the delivery pipe 152. The output end of the delivery pipe 152 is connected to the mounting member 130, and when the mounting member 130 is connected to the support base 120, the output end of the delivery pipe 152 communicates with the outer cavity of the Dewar, thereby allowing liquid nitrogen to enter the outer cavity of the Dewar. It is understood that the delivery pipe 152 is in sealed contact with the sealing cover 160, and the output end of the delivery pipe 152 extends into the test chamber 131.

[0045] Furthermore, the delivery module 151 includes a delivery valve and a delivery pump. The delivery valve is connected to the storage tank 140, and the delivery pump is connected between the delivery valve and the delivery pipeline 152. Thus, when liquid nitrogen needs to be input, the delivery valve and delivery pump are opened, and the liquid in the storage tank 140 is pumped to the delivery pipeline 152, and then input into the outer cavity of the Dewar through the delivery pipeline 152. It should be noted that if the delivery valve is located at the top of the storage tank 140, a connecting pipe can be installed inside the storage tank 140, with one end connected to the delivery valve and the other end extending to the bottom of the storage tank 140 to ensure the extraction of liquid nitrogen.

[0046] In one embodiment, the liquid supply assembly 150 further includes a flow regulator disposed in the delivery pipe 152 to regulate the flow rate of liquid nitrogen within the delivery pipe 152 and acquire flow information to obtain the amount of liquid nitrogen delivered to the Dewar outer cavity. Combined with the data from the first weighing device 110 and the second weighing device 170, it can be further determined whether a leak has occurred in the liquid supply assembly 150. Simultaneously, the flow regulator can also adjust the liquid nitrogen flow rate as needed.

[0047] In one embodiment, the liquid supply assembly 150 further includes a temperature detector disposed in the delivery pipe 152 to detect the temperature of the liquid nitrogen within the delivery pipe 152, ensuring that the temperature of the liquid nitrogen meets the test requirements. For example, since the liquid nitrogen needs to be in a liquid state, it typically needs to be maintained at around -196°C.

[0048] In one embodiment, the liquid supply assembly 150 further includes a pressure detector disposed in the delivery pipeline 152 for detecting the pressure of the delivery pipeline 152. It should be noted that in this embodiment, liquid nitrogen is delivered by a delivery pump, and under normal circumstances, the delivery pipeline 152 is completely sealed. If the delivery pipeline 152 becomes blocked, the pressure will increase; if the liquid nitrogen content in the storage tank 140 is low, the pressure will decrease. Therefore, maintenance can be performed based on the detection results of the pressure detector. Additionally, if the liquid nitrogen vaporizes, it will cause the pressure in the delivery pipeline 152 to increase. Therefore, the pressure detector, in conjunction with a temperature detector, can be used to detect whether the liquid nitrogen meets the requirements.

[0049] To facilitate understanding of the technical solution of this application, this document combines... Figure 1 The working process of the cold loss testing device in the above embodiments is described as follows:

[0050] Place the Dewar on the support 120, then connect the mounting piece 130 to the support 120, and cover the support 120 and the first weighing element 110 with the sealing cover 160. Open the delivery valve and delivery pump to input a preset amount of liquid nitrogen into the outer cavity of the Dewar, and then close the delivery valve and delivery pump. If the results of the first weighing element 110 and the second weighing element 170 are similar or the same, and match the flow data detected by the flow regulator, and the detection results of the temperature detector and the pressure detector are also normal, then the weight change measured by the first weighing element 110 within a preset time can be used to calculate the cold loss of the Dewar based on the time and weight change.

[0051] The cold loss testing device provided in this application has at least the following advantages:

[0052] 1. Liquid nitrogen is introduced into the outer cavity of the Dewar through the liquid supply assembly 150, namely the delivery valve, delivery pump and delivery pipeline 152, which can avoid liquid nitrogen splashing and improve the safety of operation.

[0053] 2. A test chamber 131 is formed between the mounting component 130 and the support base 120, and the output end of the delivery pipe 152 extends into the test chamber 131. Both the support base 120 and the mounting component 130 are made of heat-insulating material, which can avoid the influence of the external ambient temperature on the Dewar cold loss test and improve the test accuracy.

[0054] 3. A second weighing device 170 is installed below the liquid storage tank 140. By setting up a flow regulator and comparing the data of the three, it is possible to determine whether the liquid supply component 150 is leaking, thereby improving the reliability of the device.

[0055] 4. Temperature detectors and pressure detectors are installed on the delivery pipeline 152 to determine whether the liquid nitrogen meets the requirements and to determine whether the liquid supply component 150 is malfunctioning, thereby improving the reliability of the device.

[0056] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold loss testing device, characterized in that, include: First weighing item; A support base is disposed on the first weighing element, and the support base is used to support the Dewar; The mounting element is configured to connect and disconnect from the support base; A liquid storage tank and a liquid supply assembly are provided. The liquid storage tank stores liquid nitrogen, and the liquid supply assembly is connected to the liquid storage tank. The output end of the liquid supply assembly is connected to the mounting component. When the mounting component is connected to the support base, the output end of the liquid supply assembly communicates with the outer cavity of the Dewar to deliver the liquid nitrogen in the liquid storage tank to the outer cavity of the Dewar.

2. The cold loss testing device according to claim 1, characterized in that, The liquid supply assembly includes a delivery module and a delivery pipeline. The delivery module is disposed in the liquid storage tank and connected to the delivery pipeline to deliver liquid nitrogen in the liquid storage tank to the delivery pipeline. The output end of the delivery pipeline is connected to the mounting component.

3. The cold loss testing device according to claim 2, characterized in that, The delivery module includes a delivery valve and a delivery pump. The delivery valve is connected to the liquid storage tank, and the delivery pump is connected between the delivery valve and the delivery pipeline.

4. The cold loss testing device according to claim 2, characterized in that, The liquid supply assembly also includes a flow regulator, which is disposed in the delivery pipeline.

5. The cold loss testing device according to claim 2, characterized in that, The liquid supply assembly also includes a temperature detector, which is disposed in the delivery pipeline.

6. The cold loss testing device according to claim 2, characterized in that, The liquid supply assembly also includes a pressure detector, which is disposed in the delivery pipeline.

7. The cold loss testing device according to claim 2, characterized in that, It also includes a second weighing device, wherein the liquid storage tank is disposed on the second weighing device.

8. The cold loss testing device according to claim 1, characterized in that, Both the support base and the mounting component are made of heat-insulating material.

9. The cold loss testing device according to claim 1, characterized in that, When the mounting component is connected to the support base, the mounting component and the support base enclose a test cavity, the test cavity is connected to the outer cavity of the Dewar, and the output end of the liquid supply assembly extends into the test cavity.

10. The cold loss testing device according to claim 1, characterized in that, The mounting component is threaded or snapped into the support seat.

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