Double-flat-plate heat conductivity coefficient tester

Abstract

The utility model relates to a double-flat-plate heat conductivity coefficient tester which comprises a rack, a test box is arranged on the rack, and the surface of the test box is connected with an air outlet end of an air inlet pipeline; a compressor is arranged in the machine frame, a gas control valve is arranged at the output end of the compressor, the gas control valve is connected with the gas inlet end of a gas inlet pipeline, and the gas control valve is provided with a gas pressure display meter. Detection ports are formed in the four vertex angle positions of the surface of the detection box respectively, and depth measuring instruments are arranged in the detection ports and are arranged on the surface of the detection box through locking devices. According to the utility model, the detection performance and the use accuracy of the instrument are improved by improving a clamping force control system, increasing the thickness measurement accuracy of a test piece, realizing real-time thickness detection and the like.

Description

Technical Field

[0001] This utility model relates to the field of measurement and testing technology, and in particular to a dual-plate thermal conductivity measuring instrument. Background Technology

[0002] Thermal conductivity is an important parameter used to measure the thermal conductivity and insulation performance of heat-resistant materials. A thermal conductivity meter is usually used to measure the thermal conductivity of materials at different temperature states. During the test, by applying a reproducible constant clamping force, under the condition that the cold plate, hot plate and protective plate reach steady-state thermal equilibrium, according to the one-dimensional steady-state heat transfer equation, the heat generated by the hot plate heater is transferred to the cold plate through the specimen, and then transferred to the outside of the system by the circulating water and other media of the cold plate, forming a thermodynamic cycle. The thermal conductivity of the specimen is measured in this way.

[0003] However, for most thermal insulation materials, the applied pressure generally cannot exceed 2.5 kPa; therefore, the clamping force needs to be controlled during clamping. Most existing instruments connect the air pump directly to the air inlet on the side of the casing via a gas pipeline, or allow manual adjustment via a manually operated rotary valve on the side of the casing. Relying solely on the number of rotations of the manually operated valve to determine a pressure not exceeding 2.5 kPa is insufficient for precise pressure control, which can easily affect the measurement results.

[0004] Furthermore, specimen thickness is a crucial parameter when testing the thermal conductivity of materials. Existing instruments measure specimen thickness by placing a detection port at the center of the side of the casing. Therefore, the depth gauge must be inserted into the detection port after clamping is complete. This method has two drawbacks: first, setting only a single test point at the center can easily lead to inaccurate measurements or errors; second, due to thermal expansion or plate pressure, the specimen thickness may change, and existing instruments cannot perform real-time thickness measurement. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a dual-plate thermal conductivity measuring instrument, which is accurate, fast, and convenient for metrological verification.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a dual-plate thermal conductivity measuring instrument, including a frame, a test chamber is arranged on the frame, and the surface of the test chamber is connected to the outlet end of the air inlet pipe; a compressor is arranged inside the frame, and a gas control valve is arranged at the output end of the compressor, the gas control valve is connected to the air inlet end of the air inlet pipe, and the gas control valve has a gas pressure display gauge; a detection port is arranged at the four apex positions of the surface of the test chamber, and a depth measuring instrument is arranged in the detection port, the depth measuring instrument being mounted on the surface of the test chamber by a locking device.

[0007] Further, the locking device includes a base, the base is arranged on the surface of the detection box, the base is provided with a first clamping block and a second clamping block, the first clamping block and the second clamping block are provided with a connecting spring, the first clamping block is fixed on the base, and the second clamping block is slidably arranged on the base, a cam handle is arranged on the side, away from the connecting spring, of the second clamping block, the cam handle is rotatably arranged on the base, the depth measuring instrument is arranged between the first clamping block and the second clamping block, and the second clamping block is slid relative to the first clamping block on the base to realize locking after the cam handle is rotated.

[0008] Further, the first clamping block and the second clamping block are provided with limiting grooves, and the depth measuring instrument is connected with a limiting block.

[0009] Further, the top of the limiting block is provided with a groove, and the guide rod of the depth measuring instrument is clamped in the groove.

[0010] Further, the test box is relatively arranged.

[0011] Further, the rack is a box body with a cavity, the compressor and the gas control valve are arranged in the cavity, one end of the air inlet pipeline is arranged in the cavity, and the other end is arranged outside the cavity.

[0012] Further, the gas control valve is a gas pressure reducing valve, and the depth measuring instrument is a digital depth gauge.

[0013] The utility model discloses a locking device for test box, which can realize real-time measurement and adjustment of the clamping force, and can eliminate the influence of human factors on the air inlet pressure judgment.

[0014] 1. By setting up a gas pressure reducing valve, a more accurate pressure automatic control system is introduced, which can realize real-time monitoring and adjustment of the clamping force. Replacing manual rotation of the pressure valve, the current air inlet pressure value can be directly read and displayed. This not only ensures that the pressure applied to the test piece is always within the appropriate range, improving the accuracy and reliability of the test results, but also eliminates the influence of human factors on the air inlet pressure judgment, providing more accurate pressure control.

[0015] 2. The measuring points are arranged at the four top corners of the box, replacing the original depth detection method at the center of the box. This not only realizes multi-point detection, but also reduces measurement error and improves the accuracy of the test piece thickness. Moreover, the locking device can be used for real-time measurement before, during and after clamping, avoiding the influence of thickness changes caused by thermal expansion or plate pressure on the measurement results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the connection structure of this utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of the local structure at point A;

[0018] Figure 3 This is a schematic diagram of the locking device of this utility model;

[0019] In the diagram: 1. Thermal conductivity meter; 2. Operating platform; 3. Refrigeration water bath equipment; 4. Locking device; 5. Depth measuring instrument; 11. Frame; 12. Test box; 13. Air inlet pipe; 14. Compressor; 15. Gas control valve; 16. Pressure display gauge; 41. Base; 42. First clamping block; 43. Second clamping block; 44. Connecting spring; 45. Cam handle; 46. Limiting groove; 47. Limiting block; 48. Mounting groove; 51. Guide rod; 52. Probe. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0021] like Figures 1-3 The instrument shown is a dual-plate thermal conductivity meter 1, which is connected to an operating platform 2 and a cooling water bath device 3. It includes a frame 11, on which test chambers 12 are provided. There are two test chambers 12 arranged opposite each other, which can test two test pieces at the same time to avoid deviations in the thermal conductivity of the material due to system errors.

[0022] The surface of the test box 12 is connected with the outlet end of the gas inlet pipeline 13; the frame 11 is provided with a compressor 14, the output end of the compressor 14 is provided with a gas control valve 15, the gas control valve 15 is connected with the inlet end of the gas inlet pipeline 13, the gas control valve 15 is provided with a gas pressure display table 16; the frame 11 is a box body with a cavity, the compressor 14 and the gas control valve 15 are arranged in the cavity, one end of the gas inlet pipeline 13 is arranged in the cavity, and the other end is arranged outside the cavity. In the embodiment, the gas control valve 15 is a gas pressure reducing valve, by arranging the gas pressure reducing valve, a more accurate pressure automatic control system is introduced, real-time monitoring and adjustment of the clamping force can be realized; instead of manually rotating the pressure valve, the current inlet pressure value can be directly read and displayed; in this way, not only can the pressure applied to the test piece be ensured to be always in a suitable range (≤2.5kpa), the accuracy and reliability of the measurement result are improved; meanwhile, the influence of human factors on the inlet pressure judgment can be eliminated, and more accurate pressure control is provided.

[0023] Four top corner positions of the surface of the test box 12 are respectively provided with detection ports, the detection ports are provided with probes 52 of a depth measuring instrument 5, and the depth measuring instrument 5 is arranged on the surface of the detection box through a locking device 4. In the embodiment, the depth measuring instrument 5 is a digital depth gauge.

[0024] As shown in Figure 3 The locking device 4 includes a base 41, the base 41 is arranged on the surface of the detection box; the base 41 is provided with a first clamping block 42 and a second clamping block 43, and a connecting spring 44 is arranged between the first clamping block 42 and the second clamping block 43; the first clamping block 42 is fixed on the base 41, and the second clamping block 43 is slidingly arranged on the base 41; the first clamping block 42 and the second clamping block 43 are both provided with limiting grooves 46; the depth measuring instrument 5 is connected with a limiting block 47; the top of the limiting block 47 is provided with a groove, and a guide rod 51 of the depth measuring instrument 5 is clamped in the groove. The side, away from the connecting spring 44, of the second clamping block 43 is provided with a cam handle 45, and the cam handle 45 is rotationally arranged on the base 41; when locked, the limiting block 47 is located in the mounting groove 48, the depth measuring instrument 5 is arranged between the first clamping block 42 and the second clamping block 43, the cam handle 45 is rotated, the clamping block is pushed to move by using the contour curve of the cam, and the second clamping block 43 slides on the base 41 relative to the first clamping block 42 to realize locking.

[0025] The utility model discloses can determine to 1, external thermal insulation material: silicate thermal insulation material, ceramic thermal insulation material, glue powder polystyrene particle, extruded board XPS, hard bubble polyurethane thermal insulation board, foamed cement board and A-grade inorganic fireproof thermal insulation mortar etc. 2, roofing material: ceramic thermal insulation board, XPS extruded board, EPS foam board, perlite and perlite brick, vermiculite and vermiculite brick and foamed cement etc. 3, heat, air conditioning material: phenolic resin, polyurethane waterproof thermal insulation integration, rubber plastic sponge, polyethylene, polystyrene foam, glass wool and rock wool etc. 4, steel structure material: polystyrene, extruded board, polyurethane board and glass wool roll felt etc. 5, inorganic thermal insulation material: foamed cement etc. are determined.

[0026] The above description is only the specific implementation of the utility model, and various examples do not constitute the limitation to the essential content of the utility model, and the ordinary skilled person in the art can modify or deform the previous described specific implementation after reading the specification, and does not deviate from the essence and scope of the utility model.

Claims

1. A dual-plate thermal conductivity meter, characterized by: The utility model relates to a kind of gas leakage test device, including rack, which is provided with test box on the rack, and the surface of test box is connected with the outlet end of air inlet pipeline;Compressor is arranged in the rack, and the output end of compressor is provided with gas control valve, and the gas control valve is connected with the inlet end of air inlet pipeline, and the gas control valve has gas pressure display table;Detection port is respectively arranged at four top corners of the surface of test box, and depth measuring instrument is arranged in detection port, and depth measuring instrument is arranged on the surface of detection box by locking device.

2. The dual flat-plate thermal conductivity meter of claim 1, wherein: The locking device includes base, and the base is arranged on the surface of detection box;First clamping block and second clamping block are arranged on the base, and connecting spring is arranged between the first clamping block and the second clamping block;The first clamping block is fixed on the base, and the second clamping block is slidingly arranged on the base;Cam handle is arranged on the side of the second clamping block away from the connecting spring, and the cam handle is rotatably arranged on the base;Depth measuring instrument is arranged between the first clamping block and the second clamping block, and the second clamping block slides on the base relative to the first clamping block to achieve locking after the cam handle is rotated.

3. The dual flat-plate thermal conductivity meter of claim 2, wherein: Limiting groove is arranged on the first clamping block and the second clamping block;Limiting block is connected with depth measuring instrument;When locking, the limiting block is located in mounting groove.

4. The dual flat-plate thermal conductivity meter of claim 3, wherein: The top of the limiting block has a groove, and the guide rod of the depth measuring instrument is clamped in the groove.

5. The dual flat-plate thermal conductivity meter of claim 1, wherein: The test box is relatively arranged two.

6. The dual flat-plate thermal conductivity meter of claim 1, wherein: The rack is a box body with cavity, and the compressor and the gas control valve are arranged in the cavity, one end of the air inlet pipeline is arranged in the cavity, and the other end is arranged outside the cavity.

7. The dual flat-plate thermal conductivity meter of claim 1, wherein: The gas control valve is a gas pressure reducing valve, and the depth measuring instrument is a digital depth gauge.

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