A jig for assisting cryogenic testing

Abstract

The utility model discloses a kind of jigs for assisting cryogenic test, a kind of jigs for assisting cryogenic test include: solution groove, panel and the pipe connected with the panel in one end;Wherein, the pipe is placed in the solution groove with the panel in one end away from the panel, the pipe is connected with the panel in one end as opening, the pipe is sealed with the panel in one end away from the panel, the panel is opened with the opening alignment through-hole, for placing thermistor into the pipe.The utility model has the advantages of improving thermistor detection precision.

Description

Technical Field

[0001] This utility model relates to the field of thermistors, and more specifically, to a fixture for assisting in low-temperature testing. Background Technology

[0002] As a temperature-sensitive resistive element, the thermistor's resistance changes significantly with temperature variations. This characteristic makes it crucial for temperature measurement and control, but it also means that the accuracy of its resistance measurement results is highly dependent on precise temperature control. In conventional testing, to ensure temperature stability, the thermistor is usually placed directly in a constant-temperature bath filled with a non-conductive medium to prevent interference with the resistance measurement. Specifically, methyl silicone oil is often used as the medium in constant-temperature baths for high-temperature applications due to its excellent high-temperature resistance and chemical stability; anhydrous ethanol is commonly used in low-temperature applications because of its low freezing point, allowing it to remain liquid and initially non-conductive at low temperatures.

[0003] However, in actual low-temperature measurements, anhydrous ethanol or other media have the characteristic of being hygroscopic, which will absorb moisture from the air. This causes the originally non-conductive medium to become conductive due to the introduction of moisture, interfering with normal resistance measurements. As a result, the resistance value read by the measuring instrument is lower or fluctuates, deviating from the true resistance value of the thermistor at that temperature, and thus affecting the accuracy of the test results. Utility Model Content

[0004] In order to overcome the shortcomings of existing technologies, such as the susceptibility of measurement processes to interference and the fluctuation of measurement results, this utility model provides a fixture for assisting low-temperature testing.

[0005] The technical solution of this utility model is as follows: A fixture for assisting in low-temperature testing includes: a solution tank, a panel, and a conduit with one end connected to the panel; The conduit is positioned in the solution tank at one end away from the panel, with the end of the conduit connected to the panel being open and the other end of the conduit away from the panel being closed. The panel has a through hole aligned with the opening for inserting a thermistor into the conduit.

[0006] Furthermore, in one embodiment, the panel is provided with an annular groove along the side edge of the through hole, the annular groove is provided with threads, the conduit is provided with threads, and the conduit is threadedly connected to the annular groove.

[0007] Furthermore, in one embodiment, the through hole is provided with threads, the conduit is provided with threads, and the through hole is threadedly connected to the conduit.

[0008] Furthermore, in one embodiment, the conduit is inserted into or snapped into the panel.

[0009] Furthermore, in one embodiment, multiple through holes are provided, and the number of conduits is the same as the number of through holes.

[0010] Furthermore, in one embodiment, a plurality of the through holes are arranged side by side and spaced apart from each other.

[0011] Furthermore, in one embodiment, the catheter has a length of 5-50 cm and an inner diameter of 1-5 cm.

[0012] Furthermore, in one embodiment, the conduit is a metal conduit with good thermal conductivity.

[0013] Furthermore, in one embodiment, the seal is hemispherical or planar.

[0014] Furthermore, in one embodiment, the solution tank is block-shaped or cylindrical.

[0015] According to the above-described solution, the beneficial effects of this utility model are as follows: through the connection between the panel and the conduit, the thermistor can be inserted into the conduit through the through hole of the panel without contacting the medium such as anhydrous ethanol, thus avoiding the possibility that the medium such as anhydrous ethanol will become conductive due to moisture absorption, causing errors in the resistance test of the thermistor; this non-direct contact method will make the thermistor test more accurate; the panel can also be used with different tanks to improve compatibility. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a diagram showing the connection relationship between the panel and the conduit in this embodiment; Figure 2 This is a schematic diagram of the catheter structure in this embodiment; Figure 3 This is a schematic diagram of the structure of a fixture for assisting low-temperature testing in this embodiment.

[0018] In the diagram, 1 is the panel; 11 is the through hole; 2 is the conduit; 21 is the opening; 22 is the seal; and 3 is the solution tank. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 1-3 As shown, a fixture for assisting low-temperature testing includes: a solution tank 3, a panel 1, and a conduit 2 with one end connected to the panel 1; The end of the conduit 2 away from the panel 1 is placed in the solution tank 3. The end of the conduit 2 connected to the panel 1 is an opening 21, and the end of the conduit 2 away from the panel 1 is a seal 22. The panel 1 has a through hole 11 aligned with the opening 21 for placing the thermistor into the conduit 2.

[0020] In one embodiment, the thermistor and related devices can be placed on the panel 1, which serves as a mounting function. At the same time, the panel 1 can also be placed on the opening 21 of the tank, so that the conduit 2 below the panel 1 can be immersed in a medium such as anhydrous ethanol. This method is not only simple and direct, but also does not require additional support brackets. The panel 1 can also be used with tanks of different shapes, and has good compatibility.

[0021] The connection between panel 1 and conduit 2 allows the thermistor to enter through hole 11 into opening 21 and then into conduit 2. The other end of conduit 2 is sealed 22, which also prevents the thermistor from contacting media such as anhydrous ethanol. This prevents the media such as anhydrous ethanol from becoming conductive due to moisture absorption, which could cause errors in the resistance test of the thermistor. This non-direct contact method makes the thermistor test more accurate and professional, and more reliable.

[0022] A ring-shaped groove is provided around the side edge of the through hole 11 on panel 1. The ring-shaped groove contains threads, and the conduit 2 is also threaded, connecting to the ring-shaped groove via a threaded connection. In one embodiment, the threaded connection achieves a tight engagement through a helical structure, significantly improving the connection strength between panel 1 and conduit 2. This effectively prevents loosening or detachment under stress or vibration, ensuring overall stability. The threaded fit between the ring-shaped groove and the conduit 2 also forms a continuous sealing surface, significantly reducing the risk of leakage of liquids, gases, or other media from the connection point. Furthermore, from an installation and maintenance perspective, the threaded connection is simple to operate, requiring no complex tools for installation and removal of conduit 2. The connection depth can be flexibly controlled by rotation adjustment, facilitating adjustments to the assembly position according to actual needs. The detachable threaded structure also facilitates maintenance when conduit 2 needs replacement or when the area around the through hole 11 needs repair. In addition, this makes the overall design more compact and orderly, improving the appearance of the connection between panel 1 and conduit 2.

[0023] The through hole 11 is threaded, and the conduit 2 is also threaded, with the through hole 11 and the conduit 2 being threadedly connected. In one embodiment, the helical engagement structure of the thread allows the through hole 11 and the conduit 2 to form a tight and stable connection. Compared to simple plug-in or snap-fit ​​methods, it can withstand greater axial tensile force and radial torque, effectively preventing the conduit 2 from loosening or falling off due to vibration, external impact, etc. during use, ensuring the stability of the overall structure, and reducing the possibility of leakage of liquid, gas, and other media from the connection gap. From the perspective of assembly and maintenance, the threaded connection is simple and convenient to operate. Installation or disassembly can be completed simply by rotating the conduit 2, without the need for complicated tools or professional skills. Moreover, the installation depth of the conduit 2 can be precisely controlled by the number of rotations to meet different assembly requirements. The conduit 2 is inserted into or snapped into the panel 1. In one embodiment, the conduit 2 can also be inserted into or snapped into the panel 1, thereby firmly connecting the two together, suitable for rapid assembly and use in a short period of time.

[0024] like Figure 1 As shown, multiple through holes 11 are provided, and the number of conduits 2 is the same as the number of through holes 11. In one embodiment, the multiple through holes 11 cooperate with the corresponding number of conduits 2 to realize independent connection and operation of multiple channels, meeting the requirement of placing different thermistors simultaneously. At the same time, this one-to-one correspondence configuration ensures that each connection node maintains independent sealing and stability.

[0025] like Figure 1 As shown, multiple through holes 11 are arranged side by side with intervals between them. In one embodiment, the interval design provides sufficient operating space for the installation, disassembly, and maintenance of each conduit 2, avoiding mutual interference between adjacent conduits 2 due to excessive proximity. When rotating or adjusting a certain conduit 2, the operator does not need to worry about touching other conduits 2, significantly improving the convenience of assembly and maintenance. In terms of structural stability, the interval distribution can distribute stress more evenly to all parts of the panel 1, reducing the problem of local structural strength reduction caused by the dense arrangement of through holes 11, and reducing the risk of cracking or deformation of the panel 1 under stress or vibration, which is especially suitable for scenarios that need to bear a certain load.

[0026] The length of the conduit 2 is 5-50cm, and the inner diameter is 1-5cm (which can be adjusted according to the size of the product being tested). In one embodiment, the length range of the conduit 2 can well adapt to most common panel 1 thicknesses and connection scenarios, avoiding the problems of insufficient connection depth and poor stability caused by being too short, and preventing material waste and space occupation caused by being too long. At the same time, it is convenient to complete the installation and adjustment within a limited operating space. The inner diameter of 1-5cm can accommodate the requirements of various specifications of thermistors, cables or fluid transportation. It will not cause the components to be difficult to insert or the medium transportation to be obstructed due to being too thin, nor will it cause structural redundancy and increased sealing difficulty due to being too thick.

[0027] The conduit 2 is a metal conduit with good thermal conductivity. In this embodiment, the conduit 2 is specifically a copper tube. Copper has an excellent thermal conductivity, much higher than common materials such as plastic and stainless steel. In scenarios requiring precise temperature control, such as low-temperature testing of thermistors, the copper tube can quickly transfer the ambient temperature, ensuring that the temperature of the thermistor inside the tube quickly reaches equilibrium with the external medium, improving the accuracy and efficiency of the test. In terms of structural strength, the copper tube has good mechanical properties, possessing both hardness and toughness. It can withstand the rotation, insertion, and removal forces during installation, and is not prone to brittleness or deformation due to low-temperature environments or external impacts. Copper is chemically stable in dry or low-temperature anhydrous ethanol environments, and is not prone to oxidation and corrosion, which can effectively extend the service life of the conduit 2 and reduce sealing failures or structural loosening caused by material deterioration. In addition, the copper tube has good processing plasticity, making it easy to perform thread processing, end forming, and other treatments as needed, accurately matching the connection requirements of the through hole 11. At the same time, its smooth surface also facilitates the smooth insertion and removal of the thermistor, improving operational convenience.

[0028] like Figure 2 As shown, the seal 22 is hemispherical or planar. In one embodiment, the hemispherical seal 22 disperses external forces through its curved surface, making it less prone to stress concentration in low-temperature environments or when subjected to impacts, thus reducing the risk of cracking, and is especially suitable for scenarios requiring long-term tolerance to temperature changes; the planar seal 22 forms a vertical connection with the wall of the conduit 2 through its flat structure, resulting in stronger overall rigidity and better ability to withstand axial pressure, preventing the seal 22 from deforming under stress and affecting the internal sealing environment; for the adaptation of internal components, the planar seal 22 provides a flat bottom support for the thermistor, preventing the component from shaking due to unstable placement and ensuring positional stability during testing; the curved inner wall of the hemispherical seal 22 reduces the contact area between the component and the seal 22, reducing the impact of local temperature conduction differences on test accuracy.

[0029] like Figure 3 As shown, the solution tank 3 is either square or cylindrical. In one embodiment, the sharp edges of the square solution tank 3 allow it to fit more closely into rectangular spaces such as laboratory workbenches, reducing wasted space. Especially when multiple fixtures are used simultaneously, the neat arrangement can improve space utilization. In another embodiment, the cylindrical solution tank 3, with its rounded structure without sharp edges, allows for a more flexible layout in a limited space. The uniform internal space distribution facilitates the placement of temperature testing fixtures in any position within the tank, avoiding the impact of narrow corner spaces on fixture placement.

[0030] Therefore, in this invention, the conduit 2 can be completely immersed in the solution environment, ensuring full contact between the copper tube and the medium in the tank (such as anhydrous ethanol). The excellent thermal conductivity of the copper tube enables rapid temperature equilibrium, providing a stable and uniform test temperature field for the thermistor, thus ensuring the accuracy of temperature testing from an overall structural perspective. In terms of functional integrity, the solution tank 3 provides a closed and controllable low-temperature environment for testing, facilitating the maintenance of medium temperature stability. The conduit 2, through its structural design (such as copper tube isolation and a specific sealing 22 shape), solves problems related to medium moisture absorption and conductivity, and component placement stability. The combination of these two features not only meets the basic environmental requirements for low-temperature testing but also specifically addresses interference factors during the testing process, significantly improving the accuracy of thermistor resistance measurement.

[0031] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0032] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A fixture for assisting in low-temperature testing, characterized in that, include: Solution tank, panel, and conduit connected at one end to the panel; The conduit is positioned in the solution tank at one end away from the panel, with the end of the conduit connected to the panel being open and the other end of the conduit away from the panel being closed. The panel has a through hole aligned with the opening for inserting a thermistor into the conduit.

2. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The panel is provided with an annular groove along the side edge of the through hole, and the annular groove is provided with a thread. The conduit is provided with a thread and is threadedly connected to the annular groove.

3. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The through hole is threaded, the conduit is threaded, and the through hole is threadedly connected to the conduit.

4. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The conduit is inserted into or snapped into the panel.

5. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The number of through holes is multiple, and the number of conduits is the same as the number of through holes.

6. The fixture for assisting low-temperature testing according to claim 5, characterized in that: The multiple through holes are arranged side by side and spaced apart from each other.

7. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The catheter has a length of 5-50cm and an inner diameter of 1-5cm.

8. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The conduit is a metal conduit with good thermal conductivity.

9. The fixture for assisting low-temperature testing according to claim 1, characterized in that: The seal is hemispherical or planar.

10. A fixture for assisting low-temperature testing according to claim 1, characterized in that: The solution tank is square or cylindrical.

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