Device for testing high-temperature insulating property of heater insulating material

Abstract

The utility model discloses a high-temperature insulating property testing device for a heater insulating material. The high-temperature insulating property testing device comprises a base, the number of the supports is two, and the two supports are symmetrically arranged on the base; the heat insulation plate is arranged between the two brackets; the number of the tungsten electrodes is two, the two tungsten electrodes are symmetrically arranged on the heat insulation plate, and the two tungsten electrodes are connected with the two supports correspondingly; the measured object is placed between the two tungsten electrodes; one end of the thermocouple is connected with the measured object, and the other end of the thermocouple is connected with the temperature instrument; the heat insulation cotton is filled in a gap between the heat insulation plate and the thermocouple; and the nozzle is arranged above the tested object and is connected with a mixed gas pipeline for conveying propane and oxygen. The device greatly improves the working efficiency of the high-temperature insulation test of the heater material, saves labor, reduces the test cost, meets the test requirements of different materials, and meets the test requirements of the material in an ultrahigh-temperature state.

Description

Technical Field

[0001] The utility model belongs to the technical field of high - temperature insulation testing of heater insulation materials, and particularly relates to a device for testing the high - temperature insulation performance of heater insulation materials. Background Technique

[0002] The application scope of electric heaters is gradually expanding in various fields, and the operating temperature is also getting higher and higher. This puts higher requirements on the design and manufacture of electric heaters. The existing insulation materials used in heaters can only meet the temperature design requirements below 1000 °C, and are helpless for the design requirements above 1000 °C. In order to find materials with higher temperature - resistant insulation performance, it is necessary to test various performance aspects of the materials. One of the tests is the measurement of the insulation resistance value of the insulation material at high temperatures.

[0003] The high - temperature insulation resistance test above 1000 °C not only requires the material to be tested to be able to withstand high temperatures, but also the temperature - resistant performance of the test device and the heating method of the material need to be solved. For this reason, we propose a device for testing the high - temperature insulation performance of heater insulation materials. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for testing the high - temperature insulation performance of heater insulation materials to solve the problems raised in the above - mentioned background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A device for testing the high - temperature insulation performance of heater insulation materials, comprising

[0006] A base;

[0007] Two brackets, the two brackets are symmetrically arranged on the base, and the two brackets are respectively connected to the test end and the ground end of a megohmmeter through terminal posts;

[0008] A heat - insulating plate, the heat - insulating plate is arranged between the two brackets;

[0009] Two tungsten electrodes, the two tungsten electrodes are symmetrically arranged on the heat - insulating plate, and the two tungsten electrodes are respectively connected to the two brackets;

[0010] An object to be tested, the object to be tested is placed between the two tungsten electrodes;

[0011] A thermocouple, one end of the thermocouple is connected to the object to be tested, and the other end of the thermocouple is connected to a temperature meter;

[0012] Heat - insulating cotton, the heat - insulating cotton is filled in the gap between the heat - insulating plate and the thermocouple;

[0013] A nozzle, which is arranged above the object to be measured, and the nozzle is connected to a mixed gas pipeline for transporting propane and oxygen.

[0014] Preferably, the base is a base made of electrical insulating wood.

[0015] Preferably, the bracket is a high-temperature resistant metal bracket made of tungsten metal.

[0016] Preferably, the heat insulation plate is a heat-resistant test cavity sintered from high-purity magnesium material.

[0017] Preferably, the two tungsten electrodes do not touch each other.

[0018] Preferably, the thermocouple is a platinum-rhodium thermocouple of B type.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] This device greatly improves the working efficiency of the high-temperature insulation test of heater materials. By directly heating the object to be measured with a flame, the heating-up time of the object to be measured is shortened to about one-fifth, greatly saving labor and reducing the test cost. Moreover, this device can meet the test requirements of different materials through its semi-open structure without replacing or adjusting the fixture, and can meet the test needs of materials under ultra-high temperature conditions through the application of high-performance temperature-resistant materials. Description of the Drawings

[0021] Figure 1 It is a schematic cross-sectional structure diagram of the device of the present utility model.

[0022] In the figure: 1. Base; 2. Bracket; 3. Heat insulation plate; 4. Tungsten electrode; 5. Object to be measured; 6. Thermocouple; 7. Heat insulation cotton; 8. Nozzle. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figure 1 , the high-temperature insulation performance test device for heater insulating materials provided by the present utility model includes

[0025] A base 1, which is a base made of electrical insulating wood and has certain hardness and bending resistance;

[0026] Bracket 2, there are two bracket 2s, and the two bracket 2s are symmetrically arranged on the base 1. The test terminal and the grounding terminal of the megohmmeter are respectively connected to the two bracket 2s through terminal posts. The bracket 2 is a high-temperature-resistant metal bracket made of tungsten metal. The temperature resistance of tungsten metal exceeds 3400 °C, which can not only meet the temperature resistance requirements but also serve as the conductor material for contacting the object under test 5;

[0027] Heat insulation board 3, the heat insulation board 3 is arranged between the two brackets 2. The heat insulation board 3 is a heat-resistant test cavity sintered from high-purity magnesium material, and the temperature resistance level can reach more than 2000 °C;

[0028] Tungsten electrodes 4, there are two tungsten electrodes 4, and the two tungsten electrodes 4 are symmetrically arranged on the heat insulation board 3. The two tungsten electrodes 4 are respectively connected to the two brackets 2, and the two tungsten electrodes 4 do not contact each other;

[0029] Object under test 5, the object under test 5 is placed between the two tungsten electrodes 4;

[0030] Thermocouple 6, one end of the thermocouple 6 is connected to the object under test 5, and the other end of the thermocouple 6 is connected to a temperature instrument. The thermocouple 6 is a platinum-rhodium thermocouple of B type, with a maximum temperature measurement range of 1800 °C. The temperature-sensing head at the top leans against the material under test to detect the temperature of the object under test 5 in real time;

[0031] Heat insulation cotton 7, the heat insulation cotton 7 is filled in the gap between the heat insulation board 3 and the thermocouple 6 to prevent heat loss;

[0032] Nozzle 8, the nozzle 8 is arranged above the object under test 5, and the nozzle 8 is connected to a mixed gas pipeline for transporting propane and oxygen. After ignition, it sprays onto the surface of the object under test 5 to heat the object under test 5. The object under test 5 is heated by direct flame spraying. The combustion gas is relatively safe propane, plus oxygen for combustion support. The theoretical flame temperature can reach 2700 °C. Such a high-temperature flame sprayed on the test material can quickly raise the material temperature to more than 1500 °C.

[0033] When the test device in the present utility model is in use, place the object under test 5 between the two tungsten electrodes 4 so that the object under test 5 and the two tungsten electrodes 4 are in contact. Then, lean the temperature-sensing head of the thermocouple 6 against the side of the object under test 5, and connect the signal wire to the temperature instrument. Then, fill the gap around the object under test 5 with heat insulation cotton 7. Connect the test terminal and the grounding terminal of the megohmmeter to the terminal posts on the two brackets 2 respectively. Then, open the valve of the mixed gas pipeline for propane and oxygen, ignite at the nozzle 8, adjust the intake flow rates of oxygen and propane to make the flame blue. Turn on the switch of the digital display megohmmeter, adjust the test voltage and then start the test. Observe the temperature value displayed on the temperature instrument, and record the insulation value displayed on the digital display megohmmeter at this temperature;

[0034] This device greatly improves the working efficiency of the high-temperature insulation test of heater materials. By directly heating the object under test with a flame, the heating-up time of the object under test is shortened to about one-fifth, greatly saving labor and reducing the test cost. Moreover, with its semi-open structure, this device can meet the test requirements of different materials without replacing or adjusting the fixture. By applying high-performance heat-resistant materials, it can meet the test needs of materials under ultra-high temperature conditions.

[0035] In summary, the usage method of the high-temperature insulation performance test device for the heater insulation material provided in this embodiment is as follows: Place the object under test 5 between the two tungsten electrodes 4 so that the object under test 5 is in contact with both tungsten electrodes 4. Then, place the temperature-sensing head of the thermocouple 6 next to the object under test 5 and connect the signal wire to the temperature meter. Next, fill the periphery of the object under test 5 with heat-insulating cotton 7. Connect the test terminal and the grounding terminal of the megohmmeter to the wiring posts on the two brackets 2 respectively. Then, open the valve of the mixed gas pipeline of propane and oxygen, ignite at the nozzle 8, adjust the intake flow rates of oxygen and propane to make the flame blue. Turn on the switch of the digital display megohmmeter, adjust the test voltage and then start the test. Observe the temperature value displayed on the temperature meter and record the insulation value displayed on the digital display megohmmeter at this temperature.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the high temperature insulation performance of a heater insulation material, characterized in that: include Base (1); A bracket (2), wherein two brackets (2) are provided, the two brackets (2) are symmetrically arranged on the base (1), and the two brackets (2) are respectively connected to a test terminal and a ground terminal of a megohmmeter via wiring piles; A heat insulation board (3), the heat insulation board (3) being arranged between the two brackets (2); Tungsten electrodes (4), two tungsten electrodes (4) are provided, the two tungsten electrodes (4) are symmetrically arranged on the heat insulation plate (3), and the two tungsten electrodes (4) are respectively connected to the two brackets (2); An object to be measured (5), the object to be measured (5) being placed between the two tungsten electrodes (4); A thermocouple (6), one end of the thermocouple (6) is connected to the object to be measured (5), and the other end of the thermocouple (6) is connected to a temperature meter; Thermal insulation cotton (7), the thermal insulation cotton (7) filling the gap between the thermal insulation board (3) and the thermocouple (6); A nozzle (8), wherein the nozzle (8) is arranged above the object to be measured (5), and the nozzle (8) is connected to a pipeline for conveying a mixed gas of propane and oxygen.

2. A high temperature insulation performance testing device for heater insulation material according to claim 1, characterized in that: The base (1) is a base made of electrical insulating wood.

3. A high temperature insulation performance testing device for heater insulation material according to claim 1, characterized in that: The bracket (2) is a high-temperature resistant metal bracket made of metal tungsten material.

4. A high temperature insulation performance testing device for heater insulation material according to claim 1, characterized in that: The heat insulation board (3) is a heat-resistant test cavity prepared by sintering high-purity magnesium material.

5. The high temperature insulation performance testing device of a heater insulation material according to claim 1, characterized in that: The two tungsten electrodes (4) do not contact each other.

6. A high temperature insulation performance testing device for heater insulation material according to claim 1, characterized in that: The thermocouple (6) is a platinum-rhodium thermocouple of B grade.

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