CN210109224U - PTC hinders temperature testing arrangement - Google Patents
PTC hinders temperature testing arrangement Download PDFInfo
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- CN210109224U CN210109224U CN201920304979.XU CN201920304979U CN210109224U CN 210109224 U CN210109224 U CN 210109224U CN 201920304979 U CN201920304979 U CN 201920304979U CN 210109224 U CN210109224 U CN 210109224U
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Abstract
The utility model discloses a PTC hinders temperature testing arrangement, include: heating furnace, test fixture. Wherein, test fixture includes: the device comprises a control box, a first baffle, a sample table, a spring probe, a double-end threaded screw, a first cylinder and a positioning column; the heating furnace is assembled by a second cylinder, a silicon carbide hearth, a second baffle, a full-tooth screw and a positioning flange. The heating furnace is used for heating the surface of the sample; the test fixture is used for clamping a sample and controlling the temperature in the heating furnace; the temperature control module is arranged on the control box in the test fixture, so that the surface temperature of a tested sample can be effectively and accurately controlled, and the temperature of the temperature resistance test and the temperature of sample heating are isolated, so that the accuracy of the PTC temperature resistance test is improved; meanwhile, the test fixture can be placed in the heating furnace, the test fixture provides elastic force to clamp a sample on the sample table through the spring probe in the control box, the spring probe does not need to be heated in the heating furnace, deformation caused by high-temperature oxidation is avoided, and the service life of the whole device is prolonged.
Description
Technical Field
The utility model belongs to thermistor tests the field, more specifically relates to a PTC hinders temperature testing arrangement.
Background
The PTC thermistor is a high-technology semiconductor-function electronic component mainly composed of barium titanate or a high-molecular polymer material, and when the temperature reaches a certain constant value, the resistance thereof increases significantly, and particularly the resistance value rises by 3 to 7 orders of magnitude near the curie temperature point. The PTC ceramic heating element has the following characteristics: no pollution and electromagnetic radiation; the temperature is quickly increased, the temperature can be automatically controlled, and the service life is long; the voltage application range is wide, and the voltage can be designed between 12V and 600V according to requirements; the design is convenient, the design can be freely carried out from low power to high power, and the appearance can also be designed according to requirements. The PTC series thermistor is widely applied to industrial electronic equipment, aerospace and various military equipment to realize the functions of automatic demagnetization, overcurrent protection, motor starting, constant temperature heating, temperature compensation and the like. In recent years, the rapid development of the automotive industry, particularly electric vehicles, has led to an increasing demand for PTC thermistors.
The temperature resistance characteristic of the PTC is the best scale for measuring the PTC performance, and the accurate acquisition of the temperature resistance characteristic of the PTC is a necessary channel for successfully researching and developing PTC materials, processes and applications. However, the test fixture of the conventional PTC temperature resistance test system has the following two defects that on one hand, the test fixture and the heating device are in an isolated state, and the test fixture cannot realize temperature control on the heating device, so that the surface temperature of the PCT sample to be tested cannot be accurately controlled; on the other hand, in the prior art, the stainless steel spring plate is bent to provide elastic force to clamp the sample, and the sample and the spring plate are subjected to temperature rise test in the heating device, so that the stainless steel spring plate is easily oxidized by high-temperature air in the heating furnace, and the stainless steel spring plate is easily blackened and loses elastic force after being used for a long time. Therefore, the existing test fixture cannot accurately control the surface temperature of the tested PCT sample, is easy to age and needs to replace the stainless steel spring piece in time.
SUMMERY OF THE UTILITY MODEL
To the defect of the prior art, an object of the utility model is to provide a PTC hinders temperature testing arrangement aims at solving the temperature that test fixture can't control the heating furnace among the current PTC hinders temperature test system to lead to being surveyed the temperature test result that hinders of PCT sample and lack accurate problem.
In order to realize the purpose, the utility model provides a PTC temperature resistance testing device, which comprises a testing clamp and a heating furnace;
the heating furnace is positioned below the test fixture;
the test fixture is positioned above the heating furnace, part of the test fixture extends into the heating furnace, and the test fixture is connected with a lead of the heating furnace;
the heating furnace is used for heating the sample in the test fixture, the test fixture is used for clamping the sample and controlling temperature control in the heating furnace, and the spring probe used for clamping the sample in the test fixture is positioned above the heating furnace, so that deformation caused by high-temperature oxidation of the heating furnace is avoided;
preferably, the test fixture comprises a control box, a first baffle, a sample table, a spring probe, a double-end threaded screw, a first cylinder and a positioning column;
the control box is positioned above the first baffle, the bottom end of the control box is fixed with the sample table, and the control box is used for fixing the sample table and controlling the temperature in the heating furnace;
the first baffle is positioned above the first cylinder and used for supporting the control console above the heating furnace;
the sample table penetrates through the first cylinder and the first baffle through a screw rod and is connected with an electric plate of the control box; for placing a sample;
one end of the spring probe is welded on an electric plate of the control box, and the other end of the spring probe is connected with one end of the double-end threaded screw rod and used for providing elasticity for the double-end threaded screw rod and avoiding direct contact of a heating furnace;
the other end of the double-end threaded screw rod is contacted with the sample table, the double-end threaded screw rod can freely stretch and retract under the action of the spring probe, and the double-end threaded screw rod and the sample table are jointly used for clamping PCT samples with different sizes;
the first cylinder is fixedly connected below the first baffle and used for protecting the double-end threaded screw rod positioned in the first cylinder and avoiding oxidation caused by contact with high-temperature air;
the positioning column is located between the first baffle and a circuit board of the controller and used for ensuring the stability of the circuit system.
Preferably, the test fixture further comprises: silica gel plates, asbestos, and mica sheets;
the silica gel plate is positioned below the first baffle and used for isolating energy exchange between the control box and the first cylinder and between the control box and the heating furnace;
the asbestos is filled in the first cylinder and is used for isolating energy exchange between the double-end threaded screw and the heating furnace and prolonging the service life of the double-end threaded screw; the asbestos is filled between the first baffle plate and the circuit board of the control box and is used for isolating energy exchange between the first baffle plate and the circuit board and protecting components of the circuit board in the control box;
the mica sheet is fixedly connected below the first cylinder and used for insulating the first cylinder and the double-end threaded screw, so that the test accuracy is improved;
preferably, the heating furnace comprises a second baffle plate, a third baffle plate and a hearth;
the hearth is positioned between the second baffle and the third baffle; the diameter of the hearth is smaller than the diameters of the second baffle and the third baffle; the temperature setting value is used for receiving the test result and heating the sample;
the second baffle and the third baffle are respectively and fixedly connected above and below the hearth; the heating space is formed between the furnace cavity and the furnace body;
the second baffle plate is provided with a central opening, the diameter of the opening is larger than that of the first cylinder and smaller than that of the first baffle plate, and the second baffle plate is used for extending the sample stage of the test fixture into the heating furnace, enabling the control box to be positioned above the heating furnace and isolating energy exchange with the heating furnace;
preferably, the heating furnace further comprises a second cylinder, a screw, a positioning flange, asbestos and refractory bricks;
the diameter of the second cylinder is the same as that of the second baffle plate and the third baffle plate; the heating furnace is positioned outside the heating furnace and used for wrapping the hearth;
the screw is positioned between the hearth and the second cylinder, and is used for fixing the position of the hearth in the horizontal direction and placing the position deviation of the hearth in the moving process;
the positioning flange is positioned between the second baffle and the hearth, one end of the positioning flange is fixedly connected with the second baffle, and the other end of the positioning flange is connected with the screw rod and used for fixing the position of the hearth in the vertical direction;
the asbestos is filled between the hearth and the second cylinder and between the positioning flange and the second cylinder and is used for heat preservation and heat insulation of the heating furnace;
the firebricks are positioned at the bottom of the hearth and used for preventing the third baffle from being oxidized by heat.
Preferably, the screw is a full-tooth screw; the hearth is a silicon carbide hearth; the first baffle, the second baffle and the third baffle are stainless steel baffles.
Through the utility model discloses above technical scheme who thinks, compare with prior art, can gain following beneficial effect:
(1) the utility model is provided with a temperature control module in the control box of the test fixture, which is connected with the heating furnace through a wire, thus effectively controlling the temperature of the heating furnace and leading the surface temperature of the sample to be closer to the set temperature value; meanwhile, the gap parts of the test fixture and the heating furnace are filled with asbestos, and the mica sheets are arranged in the test fixture, so that the heat exchange between the heating furnace and the test fixture is effectively reduced.
(2) The utility model discloses a first baffle, silica gel board are separated test fixture's sample platform and test section, and the sample platform stretches into the heating furnace and carries out the thermally equivalent, and PTC hinders the top that the control box of temperature test is located the heating furnace, and with the exchange of heating furnace nonenergy, not only improved test fixture's life-span, also improved the accuracy that PTC hinders the temperature test simultaneously.
(3) The utility model provides a spring probe among the test fixture does not carry out direct contact with heating system, has avoided spring probe's high temperature air oxidation, can provide elasticity lastingly, the life reinforcing.
Drawings
Fig. 1 is a schematic structural diagram of a PTC temperature resistance test system provided by the present invention;
fig. 2(a) is a schematic structural diagram of a test fixture provided by the present invention;
fig. 2(b) is a schematic diagram of the internal structure of the control box provided by the present invention;
FIG. 3(a) is a schematic view of the external structure of the heating furnace provided by the present invention;
fig. 3(b) is a schematic view of the internal structure of the heating furnace provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the utility model provides a PTC temperature resistance testing device 1, which comprises a testing clamp 2 and a heating furnace 3;
the heating furnace 3 is positioned below the test fixture;
the test fixture 2 is positioned above the heating furnace 3, part of the test fixture extends into the heating furnace, and the test fixture is connected with a lead of the heating furnace;
the heating furnace 3 is used for heating the sample in the test fixture 2;
the test fixture 2 is used for clamping a sample and controlling the temperature in the heating furnace 3, and the spring probe used for clamping the sample in the test fixture 2 is positioned above the heating furnace, so that the deformation of the spring probe caused by high-temperature oxidation of the heating furnace is avoided.
Preferably, the test fixture comprises a control box, a first baffle, a sample table, a spring probe, a double-end threaded screw, a first cylinder and a positioning column;
the control box is positioned above the first baffle, the bottom end of the control box is fixed with the sample table, and the control box is used for fixing the sample table and controlling the temperature in the heating furnace;
the first baffle is positioned above the first cylinder and used for supporting the control console above the heating furnace;
the sample table penetrates through the first cylinder and the first baffle through a screw rod and is connected with an electric plate of the control box; for placing a sample;
one end of the spring probe is welded on an electric plate of the control box, and the other end of the spring probe is connected with one end of the double-end threaded screw rod and used for providing elasticity for the double-end threaded screw rod and avoiding direct contact with the heating furnace;
the other end of the double-end threaded screw rod is contacted with the sample table, the double-end threaded screw rod can freely stretch and retract under the action of the spring probe, and the double-end threaded screw rod and the sample table are jointly used for clamping PCT samples with different sizes;
the first cylinder is fixedly connected below the first baffle and used for protecting the double-end threaded screw rod positioned in the first cylinder and avoiding oxidation caused by contact with high-temperature air;
the positioning column is located between the first baffle and a circuit board of the controller and used for ensuring the stability of the circuit system.
Preferably, the test fixture further comprises: silica gel plates, asbestos, and mica sheets;
the silica gel plate is positioned below the first baffle and used for isolating energy exchange between the control box and the first cylinder and between the control box and the heating furnace;
the asbestos is filled in the first cylinder and is used for isolating energy exchange between the double-end threaded screw and the heating furnace and prolonging the service life of the double-end threaded screw; the asbestos is filled between the first baffle plate and the circuit board of the control box and is used for isolating energy exchange between the first baffle plate and the circuit board and protecting components of the circuit board in the control box;
the mica sheet is fixedly connected below the first cylinder, is fixedly connected with the screw, and is used for insulating the first cylinder and the double-end threaded screw, so that the test accuracy is improved, and the sample stage is further fixed;
the mica sheet has good insulativity and thermal conductivity, can resist high temperature and has certain ductility and processability; the material also has good physical and chemical properties in the temperature sharp change or acid-base environment;
preferably, the heating furnace comprises a second baffle plate, a third baffle plate and a hearth;
the hearth is positioned between the second baffle and the third baffle; the diameter of the hearth is smaller than the diameters of the second baffle and the third baffle; the temperature setting value is used for receiving the temperature setting value of the test fixture and heating the sample;
the second baffle and the third baffle are respectively and fixedly connected above and below the hearth; the heating space is formed between the furnace cavity and the furnace body;
the second baffle plate is provided with a central opening, the diameter of the opening is larger than that of the first cylinder and smaller than that of the first baffle plate, and the second baffle plate is used for extending the sample stage of the test fixture into the heating furnace, enabling the control box to be positioned above the heating furnace and isolating energy exchange with the heating furnace;
preferably, the heating furnace further comprises a second cylinder, a screw, a positioning flange, asbestos and refractory bricks;
the diameter of the second cylinder is the same as that of the second baffle plate and the third baffle plate; the heating furnace is positioned outside the heating furnace and used for wrapping the hearth;
the screw is positioned between the hearth and the second cylinder, and is used for fixing the position of the hearth in the horizontal direction and placing the position deviation of the hearth in the moving process;
the positioning flange is positioned between the second baffle and the hearth, one end of the positioning flange is fixedly connected with the second baffle, and the other end of the positioning flange is connected with the screw rod and used for fixing the position of the hearth in the vertical direction;
the asbestos is filled between the hearth and the second cylinder and between the positioning flange and the second cylinder and is used for heat preservation and heat insulation of the heating furnace;
the firebricks are positioned at the bottom of the hearth and used for preventing the third baffle from being oxidized by heat.
Preferably, the screw is a full-tooth screw; the hearth is a silicon carbide hearth; the first baffle, the second baffle and the third baffle are stainless steel baffles.
As shown in fig. 2(a), for the utility model provides a multistation measuring clamp, include: a control box 101, a stainless steel plate 103, a silicon rubber plate 104, a stainless steel cylinder 105, a mica sheet 106, a full-thread screw 108, a spring probe 109, a double-end thread screw 201 and a gold-plated screw 202;
the control box 101 is fixedly connected with the stainless steel plate 103 and the silicon rubber plate 104 in a combined manner by mounting screws and nuts on hole sites 102; the nut between the control box 101 and the stainless steel plate 103 can adjust the height for lifting the control box 101, which is beneficial to the heat dissipation in the control box 101;
the silicon rubber plate 104 is used for heat insulation and insulation, so that the contact and energy exchange between the stainless steel plate 103 and the upper cover plate of the heating furnace are isolated, and the service life is prolonged;
the control box 101, the stainless steel plate 103 and the silicon rubber plate 104 are all positioned above the heating furnace;
the stainless steel cylinder 105 is fixed with the stainless steel plate 103 and the mica sheet 106 by screws respectively; the stainless steel cylinder 105 is filled with asbestos for isolating heat between the furnace chamber of the heating furnace and the control box.
As shown in fig. 2(b), the internal structure of the control box provided by the present invention is provided;
the circuit board is internally provided with a temperature control module, is connected with the heating furnace through an electric wire and is used for controlling the temperature in the heating furnace;
the positioning hole 110 of the circuit board is used for fixing the circuit board 107;
the gap between the circuit board 107 and the stainless steel plate 103 can be filled with asbestos, so that heat is further isolated, and the temperature of each component on the circuit board is reduced;
the spring probe 109 is welded on the circuit board, one end of the rod of the double-end thread screw 201 is connected with the spring probe, and the other end of the rod extends into the heating furnace;
one end of the full-tooth screw 108 is fixed with the circuit board by using a screw, and the other end of the full-tooth screw is fixed with the sample plate 107;
the sample plate is positioned at a position where the double-end threaded rod 201 naturally falls or slightly compresses the double-end threaded rod 201; the gold-plated screws 202 are arranged on the sample holes of the sample plate 107, so that the conductivity can be improved, and the test error can be reduced;
the double-end threaded rod 201 and the gold-plated screw 202 are in a natural dropping or slightly pressing state, once a sample is added, the sample can be clamped by the elastic force provided by the spring probe 109, so that the effect of fixing the sample is achieved, and meanwhile, the spring probe is positioned in the control box 101, so that the process of thermal oxidation can be avoided, and the service life is prolonged.
Fig. 3(a) shows a specific external structure diagram of a heating furnace according to the present invention, wherein the second cylinder 301 is a stainless steel cylinder; as shown in fig. 3(b), which is an internal structure view of the heating furnace shown in fig. 3(a), the heating furnace includes: universal wheels 306, a stainless steel lower plate 305, asbestos, heat insulation bricks, a screw 307, a stainless steel cylinder, a hearth 304, a positioning flange 303 and a stainless steel upper plate 302;
the universal wheel 306 is fixedly connected with the stainless steel lower plate 305;
4 circular holes are arranged on the same circumference close to the hearth on the stainless steel lower plate 305, and the four circular holes are positioned on the stainless steel lower plate 305 corresponding to the stainless steel cylinder 301 on the hearth;
the 4 screws 307 penetrate through the corresponding round holes and are used for fixing the hearth 304;
the asbestos is filled between the hearth 304 and the second cylinder 301; the positioning flange 303 is fastened above the hearth 304, and the asbestos is filled between the positioning flange 303 and the second cylinder 301; the asbestos serves, on the one hand, to reduce the effect of the high temperature of the second cylinder 301 in the furnace and, on the other hand, to keep the sample inside the furnace at a constant temperature;
the heat insulation bricks are positioned at the upper parts of the asbestos, and the asbestos and the heat insulation bricks are adjusted to ensure that the total heights of the middle hearth 304 and the positioning flange 303 are consistent with the height of the stainless steel upper plate 302;
the hearth 304 is placed among the 4 screws, and the hearth is rotated to enable the hearth wiring position to be aligned with the socket hole position of the stainless steel upper plate 302;
the screw 307 is embedded into a corresponding round hole of the positioning flange 303, and is fixed by adopting a nut, and the nut is adjusted to enable the upper part of the positioning flange and the outer wall 305 to be positioned at the same height;
the stainless steel upper plate was fixed to the stainless steel cylinder and the positioning flange, thereby completing the outer structure of the heating furnace shown in fig. 3 (a).
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A PTC temperature resistance testing device is characterized by comprising a testing clamp and a heating furnace;
the heating furnace is positioned below the test fixture;
the test fixture is positioned above the heating furnace and partially extends into the heating furnace;
the heating furnace is used for heating the surface of the sample;
the test fixture is used for clamping a sample and controlling the temperature in the heating furnace.
2. A PTC temperature resistance test device according to claim 1,
the test fixture includes: the device comprises a control box, a first baffle, a sample table, a spring probe and a double-end threaded screw rod;
the control box is positioned above the first baffle, the bottom end of the control box is fixed with the sample table, and the control box is used for fixing the sample table and controlling the temperature in the heating furnace;
the first baffle is positioned above the first cylinder and used for supporting the control console above the heating furnace;
the sample table penetrates through the first cylinder, is connected with the first baffle and is connected with an electric plate of the control box; for placing a sample;
one end of the spring probe is welded on an electric plate of the control box, and the other end of the spring probe is connected with one end of the double-end threaded screw rod and used for providing elasticity for the double-end threaded screw rod and avoiding direct contact with the heating furnace;
the other end of the double-end threaded screw rod is in contact with the sample table, the double-end threaded screw rod can freely stretch out and draw back under the action of the spring probe, and the double-end threaded screw rod and the sample table are jointly used for clamping PCT samples of different sizes.
3. A PTC temperature resistance testing device according to claim 1 or 2, wherein the test jig further comprises a first cylinder, a positioning column, a silica gel plate, asbestos, and a mica sheet;
the first cylinder is fixedly connected below the first baffle and used for protecting a double-end threaded screw rod positioned in the first cylinder and avoiding oxidation caused by contact with high-temperature air;
the positioning column is positioned between the first baffle and the circuit board of the controller and used for ensuring the stability of the circuit system;
the silica gel plate is positioned below the first baffle and used for isolating energy exchange between the control box and the first cylinder and between the control box and the heating furnace;
the asbestos is filled in the first cylinder and is used for isolating energy exchange between the double-end threaded screw and the heating furnace and prolonging the service life of the double-end threaded screw; the asbestos is filled between the first baffle plate and the circuit board of the control box and is used for isolating energy exchange between the first baffle plate and the circuit board and protecting components of the circuit board in the control box;
mica sheet fixed connection is in first drum below for first drum and the insulation of double-ended screw thread screw rod improve the degree of accuracy of test.
4. A PTC temperature resistance measuring device according to claim 3, wherein the heating furnace comprises a second baffle plate, a third baffle plate and a furnace chamber;
the hearth is positioned between the second baffle and the third baffle; the diameter of the hearth is smaller than the diameters of the second baffle and the third baffle; the temperature setting value is used for receiving the temperature setting value of the test fixture and heating the sample;
the second baffle and the third baffle are respectively and fixedly connected above and below the hearth; the heating space is formed between the furnace cavity and the furnace body;
the second baffle plate is provided with a central opening, the diameter of the opening is larger than that of the first cylinder and smaller than that of the first baffle plate, and the second baffle plate is used for extending the sample table of the test fixture into the heating furnace, enabling the control box to be located above the heating furnace and isolating energy exchange with the heating furnace.
5. A PTC temperature resistance measuring device according to claim 4, wherein the heating furnace further comprises a second cylinder, a screw, a positioning flange, asbestos, and firebricks;
the diameter of the second cylinder is the same as that of the second baffle plate and the third baffle plate; the heating furnace is positioned outside the heating furnace and used for wrapping the hearth;
the screw is positioned between the hearth and the second cylinder, and is used for fixing the position of the hearth in the horizontal direction and placing the position deviation of the hearth in the moving process;
the positioning flange is positioned between the second baffle and the hearth, one end of the positioning flange is fixedly connected with the second baffle, and the other end of the positioning flange is connected with the screw rod and used for fixing the position of the hearth in the vertical direction;
the asbestos is filled between the hearth and the second cylinder and between the positioning flange and the second cylinder; the heat insulation plate is used for heat preservation and heat insulation of a heating furnace;
the firebricks are positioned at the bottom of the hearth and used for preventing the third baffle from being oxidized by heat.
6. A PTC temperature resistance test device according to claim 4, wherein the furnace is a silicon carbide furnace.
7. A PTC temperature resistance test device according to claim 4, wherein the first baffle, the second baffle and the third baffle are stainless steel baffles.
8. A PTC temperature resistance test device according to claim 3, wherein the screw is a full-tooth screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920304979.XU CN210109224U (en) | 2019-03-12 | 2019-03-12 | PTC hinders temperature testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920304979.XU CN210109224U (en) | 2019-03-12 | 2019-03-12 | PTC hinders temperature testing arrangement |
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| CN210109224U true CN210109224U (en) | 2020-02-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828174A (en) * | 2019-03-12 | 2019-05-31 | 华中科技大学 | A kind of warm test device of PTC resistance |
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2019
- 2019-03-12 CN CN201920304979.XU patent/CN210109224U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828174A (en) * | 2019-03-12 | 2019-05-31 | 华中科技大学 | A kind of warm test device of PTC resistance |
| CN109828174B (en) * | 2019-03-12 | 2024-02-02 | 华中科技大学 | PTC temperature resistance testing device |
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