CN217699245U - A constant temperature system for measuring the temperature coefficient of resistance - Google Patents

Abstract

The utility model discloses a constant temperature system for measuring resistance temperature coefficient, which comprises a constant temperature mechanism and a detection mechanism, wherein the constant temperature mechanism provides a detection environment with specified temperature for the detection mechanism through a heat-conducting medium; the detection mechanism comprises a clamping assembly and a test wire, the clamping assembly is used for clamping a sample to be tested, the clamping assembly is arranged in the sealed heat conduction box, and the test wire penetrates through the sealed heat conduction box and then is connected to the two ends of the clamping assembly; the sealed heat conduction box comprises a box body and a top cover, a sealed cavity is formed after the top cover is installed and connected with the box body, and a counterweight base is installed and connected to the bottom of the box body. The clamping assembly is arranged in the sealed heat conduction box and is not in contact with heat conduction oil, so that the situation that the heat conduction oil is immersed between a sample and the clamp to form an oil film to influence the detection precision is avoided, the clamp is not required to be frequently cleaned, and meanwhile, the sealed heat conduction box can naturally enable the liquid level to rise when immersed in the heat conduction oil, and the using amount of the heat conduction oil is reduced.

Description

A constant temperature system for measuring the temperature coefficient of resistance

technical field

The utility model relates to the technical field of detecting the temperature coefficient of resistance, in particular to a constant temperature system for measuring the temperature coefficient of resistance.

Background technique

The temperature coefficient of resistance (temperature coefficient of resistance referred to as TCR) indicates the relative change of the resistance value when the temperature rises by one degree, the unit is ppm/℃, and there are positive and negative points. For many materials, it is an important electrical performance parameter, such as precision resistance alloys, the temperature coefficient of resistance is its core performance parameter, and the TCR of such materials is generally small, which requires the test system to have high test accuracy , including the detection accuracy of the detection instrument and the temperature control accuracy of the temperature control system. That is to say, it is necessary to accurately measure the resistance value at the temperature at an accurate temperature, and obtain credible data for the calculation of the temperature coefficient of resistance.

At present, the commonly used temperature coefficient of resistance test system is composed of a constant temperature system with a constant temperature bath as the main body and a detection system with a resistance tester as the main body. The constant temperature system often uses heat transfer oil as the heat transfer medium to provide a constant temperature environment for the detection system. However, , in the process of actual use, since the test sample including the fixture is immersed in the oil, the heat transfer oil will inevitably immerse into the sample and the fixture to form an oil film, which will affect the measurement accuracy of the resistance, and the fixture needs to be changed every time the sample is replaced. Cleaning, due to the complexity of the fixture, it is very troublesome to clean.

Utility model content

The purpose of the utility model is to provide a constant temperature system for measuring the temperature coefficient of resistance.

The technical problem solved by the utility model is that the clamp needs to be cleaned every time the sample is replaced, which is time-consuming and laborious and affects the measurement accuracy.

The purpose of this utility model can be realized through the following technical solutions:

A constant temperature system for measuring the temperature coefficient of resistance, comprising a constant temperature mechanism and a detection mechanism, the constant temperature mechanism provides the detection mechanism with a detection environment at a specified temperature through a heat-conducting medium; the detection mechanism includes a clamping component and a test line, and the clamping component is used for clamping For the sample to be tested, the clamping component is set inside the sealed heat conduction box, and the test line passes through the sealed heat conduction box and is connected to both ends of the clamping component; the sealed heat conduction box includes a box body and a top cover, and the top cover is installed and connected to the box body A sealed cavity is formed, and a counterweight base is installed and connected to the bottom of the box body.

As a further solution of the utility model: the test line passes through the side of the box body and is connected to both ends of the clamping assembly, and the position of the test line on the box body is provided with a ring-shaped insulating terminal, and the insulating terminal is sleeved on the test line outside.

As a further solution of the utility model: the positions where the box body and the top cover are connected to each other are respectively provided with corresponding separation grooves, and sealing gaskets are arranged in the separation grooves.

As a further solution of the utility model: two ends of the top cover are fixedly provided with device ears.

As a further solution of the utility model: the clamping assembly includes an insulating base, a fixed knife edge and a movable knife edge, the fixed knife edge is fixedly connected to the insulating base, and the movable knife edge is movably connected to the insulating base through a slide rail; block, the fixed block is threadedly connected with a driving screw, one end of the driving screw is provided with a knob, and the other end is connected with the movable knife edge through an adapter.

As a further solution of the utility model: an indicating arrow is arranged on the side of the movable knife edge, and a scale scale is arranged on the position corresponding to the indicating arrow on the insulating base.

As a further solution of the utility model: the longitudinal section of the slide rail is dovetail-shaped, and baffle plates are respectively installed at both ends of the slide rail.

As a further solution of the utility model: the constant temperature mechanism includes a constant temperature tank, a thermometer and a heat source, a liquid heat transfer medium is arranged in the constant temperature tank, and both the thermometer and the heat source are immersed in the heat transfer medium.

As a further solution of the present invention: there are two stirrers arranged in the heat-conducting medium, and they are respectively arranged at diagonal positions of the constant temperature bath.

As a further solution of the present invention: a thermocouple is also provided, and one end of the thermocouple extends into the sealed heat conduction box to contact with the sample to be tested.

The beneficial effects of the utility model:

(1) The clamping component is set in a sealed heat-conducting box and does not come into contact with the heat-conducting oil, so as to avoid the situation where the heat-conducting oil is immersed in the sample and the fixture to form an oil film that affects the detection accuracy, and there is no need to frequently clean the fixture. At the same time, the heat conduction is sealed When the box is immersed in heat transfer oil, the liquid level will rise naturally, reducing the amount of heat transfer oil used;

(2) It is equipped with a movable knife edge to adjust the length of the sample connected to the detection line, reducing the requirements for the length specification of the sample, and does not need to repeat the design of the fixture; it is also equipped with a scale to display the length of the sample connected in real time, which is convenient and fast.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the structural representation of the detection mechanism of the utility model;

Fig. 3 is the partially enlarged structural representation of place A in Fig. 2 of the present utility model;

Fig. 4 is a structural schematic diagram of the utility model in a top view;

Fig. 5 is a structural schematic diagram of the guide rail of the present invention.

In the figure: 1, constant temperature mechanism; 101, constant temperature tank; 102, heat conduction medium; 103, heat source; 104, agitator; 2, detection mechanism; 201, test line; 202, insulating base; 203, fixed knife edge; Knife edge; 205, fixed block; 206, scale scale; 3, sealed heat conduction box; 301, box body; 302, top cover; 303, sealing gasket; 304, device ear; 4, thermocouple.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

Please refer to Figures 1-5, the utility model is a constant temperature system for measuring the temperature coefficient of resistance, including a constant temperature mechanism 1 and a detection mechanism 2, and the constant temperature mechanism 1 provides a detection environment of a specified temperature for the detection mechanism 2 through a heat-conducting medium 102 The detection mechanism 2 includes a clamp assembly and a test line 201, the clamp assembly is used to clamp the sample to be tested, the clamp assembly is arranged inside the sealed heat conduction box 3, and the test line 201 is connected to the clamp after passing through the seal heat conduction box 3 The two ends of the assembly; the sealed heat conduction box 3 includes a box body 301 and a top cover 302. After the top cover 302 is installed and connected with the box body 301, a sealed cavity is formed. The connection mode between the box body 301 and the top cover 302 is not limited. Choose a buckle connection that is easy to disassemble or a stable bolt connection. Further, in order to enable the sealed heat conduction box 3 to overcome the buoyancy formed by its cavity and smoothly immerse in the environment of the constant temperature mechanism 1, the bottom of the box body 301 is installed and connected. Weighted base.

When the device is in use, the constant temperature mechanism 1 forms a constant temperature environment of a specified temperature on the outside of the sealed heat conduction box 3 through the heat conduction medium 102, and forms a constant temperature environment in the sealed heat conduction box 3 after the heat is passed to measure the temperature of the sample to be tested at a specified temperature. Temperature coefficient of resistance, set the clamping component inside the sealed heat conduction box 3 to avoid the formation of an oil film between the clamping component and the sample to be tested, ensure the detection accuracy of the temperature coefficient of resistance, and at the same time do not need to clean the clamping component for each test .

In one embodiment of the present utility model, the test line 201 passes through the side of the box body 301 and is connected to both ends of the clamping assembly, and the box body 301 is provided with an insulating terminal with a ring structure at the position of the test line 201 . The insulated terminal is set outside the test line 201; the test line 201 is set on the side of the box body 301 so that it will not be affected by the test line 201 every time the top cover 302 is disassembled, and it is more convenient to use. The insulated terminal is provided to increase the box body The tightness of the connection position between 301 and test line 201 improves the safety of test line 201 at the same time, and avoids short circuit caused by broken skin of test line 201.

In one of the embodiments of the present utility model, the positions where the box body 301 and the top cover 302 are connected to each other are respectively provided with corresponding separation grooves, and a sealing gasket 303 is arranged in the separation groove, and the sealing is strengthened by being provided with the separation groove and the sealing gasket 303 The sealing performance of the heat conduction box 3 prevents the heat conduction medium 102 from penetrating into the inside of the sealed heat conduction box 3 and affecting the test.

In one embodiment of the present utility model, two ends of the top cover 302 are fixedly provided with ears 304 , and it is convenient to take out the sealed heat conduction box 3 from the heat conduction medium 102 by providing the ears 304 .

In one embodiment of the present utility model, the clamping assembly includes an insulating base 202, a fixed knife edge 203 and a movable knife edge 204, the fixed knife edge 203 is fixedly connected to the insulating base 202, and the movable knife edge 204 is movably connected to the insulating base 202 through a slide rail; The end of the insulating base 202 away from the fixed knife edge 203 is provided with a fixed block 205, the fixed block 205 is threadedly connected with a drive screw, one end of the drive screw is provided with a knob, and the other end is connected with the movable knife edge 204 through an adapter; The driving screw can change the position of the movable knife edge 204, and then change the distance between the fixed knife edge 203 and the movable knife edge 204, and finally change the length of the sample that is connected to the test, which can be adjusted according to the length of the sample and reduce the requirements for the length specification of the sample Further, the side of the movable knife edge 204 is provided with an indicating arrow, and the position corresponding to the indicating arrow on the insulating base 202 is provided with a scale scale 206, by being provided with the indicating arrow and the scale scale 206, the length of the sample passing into the test line 201 can be displayed immediately , to facilitate real-time recording of data; further, in order to prevent the movable knife edge 204 from moving away from the slide rail, the longitudinal section of the slide rail is dovetail-shaped and baffles are installed at both ends of the slide rail; wherein, the clamp of the fixed knife edge 203 and the movable knife edge 204 The holding parts are all in the shape of knife edges, so that when clamping, they contact the surface of the sample with a small contact area, leaving linear traces, which is convenient for accurate measurement of the length direction of the sample and reduces errors; further, the fixed knife edge 203 and the movable knife edge 204 are both It is divided into upper and lower parts, namely the upper knife edge and the lower knife edge, and the upper knife edge and the lower knife edge are fixed with two bolts.

In one of the embodiments of the present utility model, the constant temperature mechanism 1 includes a constant temperature tank 101, a thermometer and a heat source 103. A liquid heat transfer medium 102 is arranged in the constant temperature tank 101. Preferably, the heat transfer medium 102 is a heat transfer oil, such as dimethyl Silicone oil and heat conduction oil are insulated and non-conductive, so it is not easy to cause short circuit, and the temperature of heat conduction oil can be heated relatively high, and the heat transfer effect is relatively good; both the thermometer and the heat source 103 are immersed in the heat conduction medium 102, and the thermometer is used to measure and monitor the heat conduction medium 102, the heat source 103 is used to heat the heat conduction medium 102; further, the heat conduction medium 102 is provided with an agitator 104, preferably, the quantity of the agitator 104 is two, and they are respectively arranged at the opposite corners of the constant temperature bath 101 Position, by setting the stirrer 104 to rotate in the same direction in the constant temperature tank 101, so that the heat transfer medium 102 in the constant temperature tank 101 circulates, and then the temperature in the entire constant temperature tank 101 is kept uniform and stable; when the heat source 103 is used, it is located in the sealed Below the heat conduction box 3, the heat lost outside the sealed heat conduction box 3 is replenished in time through the flowing heat conduction medium 102, so that the temperature remains stable; further, a thermocouple 4 is also provided, and one end of the thermocouple 4 extends into the sealed heat conduction box 3 The inside is in contact with the sample to be tested, and the thermocouple 4 is arranged to detect the temperature of the sample, so that the temperature data can be reflected more clearly and accurately.

An embodiment of the present utility model has been described in detail above, but the content described is only a preferred embodiment of the present utility model, and cannot be considered as limiting the implementation scope of the present utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (10)

1. A constant temperature system for measuring a resistance temperature coefficient comprises a constant temperature mechanism (1) and a detection mechanism (2), wherein the constant temperature mechanism (1) provides a detection environment with a specified temperature for the detection mechanism (2) through a heat-conducting medium (102); the detection mechanism (2) comprises a clamping assembly and a test line (201), wherein the clamping assembly is used for clamping a sample to be detected and is characterized in that the clamping assembly is arranged in the sealed heat conduction box (3), and the test line (201) penetrates through the sealed heat conduction box (3) and then is connected to the two ends of the clamping assembly; the sealed heat conduction box (3) comprises a box body (301) and a top cover (302), a sealed cavity is formed after the top cover (302) is installed and connected with the box body (301), and a counterweight base is installed and connected to the bottom of the box body (301).

2. The constant temperature system for measuring the temperature coefficient of resistance according to claim 1, wherein the test wire (201) penetrates through the side surface of the box body (301) and then is connected with two ends of the clamping assembly, and an insulating terminal with an annular structure is arranged on the box body (301) at the position of the test wire (201), and the insulating terminal is sleeved outside the test wire (201).

3. The constant temperature system for measuring resistance temperature coefficient according to claim 2, wherein the box body (301) and the top cover (302) are provided with corresponding separating grooves at the positions where they are connected with each other, and sealing gaskets (303) are provided in the separating grooves.

4. A thermostatic system for temperature coefficient of resistance measurement as set forth in claim 3 wherein the top cover (302) has lug (304) fixedly disposed at both ends.

5. The constant temperature system for measuring the resistance temperature coefficient is characterized in that the clamping assembly comprises an insulating base (202), a fixed knife edge (203) and a movable knife edge (204), the fixed knife edge (203) is fixedly connected with the insulating base (202), and the movable knife edge (204) is movably connected with the insulating base (202) through a sliding rail; one end of the insulating base (202), which is far away from the fixed knife edge (203), is provided with a fixed block (205), a driving screw is in threaded connection with the fixed block (205), one end of the driving screw is provided with a knob, and the other end of the driving screw is connected with the movable knife edge (204) through an adapter piece.

6. The constant temperature system for measuring the resistance temperature coefficient is characterized in that an indicating arrow is arranged on the side surface of the movable knife edge (204), and a graduated scale (206) is arranged on the insulating base (202) at the position corresponding to the indicating arrow.

7. The constant temperature system for measuring resistance temperature coefficient of claim 6, wherein the slide rail has a dovetail-shaped longitudinal section and has two ends respectively provided with a baffle.

8. The thermostatic system for measuring temperature coefficient of resistance according to claim 7, characterized in that the thermostatic mechanism (1) comprises a thermostatic bath (101), a thermometer and a heat source (103), wherein a liquid heat-conducting medium (102) is arranged in the thermostatic bath (101), and the thermometer and the heat source (103) are both immersed in the heat-conducting medium (102).

9. The thermostat system for measuring temperature coefficient of resistance according to claim 8, characterized in that stirrers (104) are provided in the heat-conducting medium (102), and the number of stirrers (104) is two and is provided at diagonal positions of the thermostat (101).

10. The constant temperature system for measuring the temperature coefficient of resistance according to any one of claims 1 to 9, characterized in that a thermocouple (4) is further provided, and one end of the thermocouple (4) extends into the sealed heat conduction box (3) to be in contact with a sample to be measured.

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