Device for detecting heat dissipation performance of metal material

Abstract

A device for detecting the heat dissipation performance of a metal material belongs to the technical field of heat conductivity coefficient measurement, and is characterized in that a constant-temperature water tank is arranged on a first bracket, a clamping conveying lifting mechanism is arranged on a second bracket, the clamping conveying lifting mechanism is positioned above the constant-temperature water tank, and the clamping conveying lifting mechanism comprises a sample clamping area; the cooling temperature testing assembly is located above the sample clamping area, and the heating temperature testing assembly is located below the sample clamping area. When the sample clamping area is tightly attached to the liquid upper surface of the constant-temperature water tank, a three-dimensional steady-state heat transfer model among the cooling temperature testing assembly, the sample clamping area, the heating temperature testing assembly and the sample clamping area is constructed. Aiming at the problem that a ratio k of a radius to a thickness of a sample needing to be subjected to heat dissipation performance detection by an applicant is less than 6.1 and is greatly influenced by heat dissipation of a side wall, the utility model provides a detection device with a simple structure.

Description

Technical Field

[0001] The present application belongs to the technical field of thermal conductivity measurement, and in particular relates to a device for detecting the heat dissipation performance of metal materials. Background Art

[0002] The use of thermal insulation materials plays an important role in the country's modern science and technology, national economic development, and energy conservation. Thermal conductivity is an important indicator for measuring the thermal conductivity and thermal insulation performance of thermal insulation materials. At present, there are two methods for measuring thermal conductivity on the market: steady-state method and non-steady-state method. Non-steady-state methods include: flash method, hot wire method, etc.; the measurement environment requirements are relatively harsh, the instrument is expensive, and the operation is complicated. Steady-state methods include: heat flow method, protective heat flow method, protective hot plate method, etc.; the steady-state heat flow method is based on an idealized steady-state heat conduction between two parallel isothermal panels isolated by a sample. However, in the experiments designed in the earlier relevant literature to measure the thermal conductivity of poor conductors based on the steady-state method, the influence of side wall heat dissipation is ignored, such as the public technical solution with the publication number CN219573973U, a thermal conductivity device based on the steady-state heat flow method, which uses a one-dimensional steady-state heat transfer between the hot plate assembly, the sample and the cold plate assembly to detect the thermal conductivity of the sample.

[0003] In actual work, some scientists have established a three-dimensional physical model in the Journal of Materials Science and Engineering that incorporates convective heat transfer between the side wall and the external environment. The parameters are: height L, cross-sectional radius ρ 0 Its upper and lower surfaces are in close contact with a heating plate and a heat sink, respectively. The temperatures of the two are stable at T1 and T2, respectively, and the temperature of the surrounding air is T3. The heat flux density of the heat sink is q1, the heat flux density of the side wall convection heat transfer is q0, the thermal conductivity of the sample is λ, the kinematic viscosity of the air is v, the thermal diffusivity is a, the volume expansion coefficient is α, and the sample temperature function is represented by T.

[0004] And define k = ρ 0 / L is the ratio of the sample radius to the thickness. When k < 6.1, the influence of side wall heat dissipation will exceed 20%. The following formula 1 is used to calculate the thermal conductivity: When k>28.9, the influence of sidewall heat dissipation will be less than 5%. At this time, this error can be ignored and the one-dimensional formula is used. It is easier to calculate the thermal conductivity. Utility Model Content

[0005] The utility model aims to provide a detection device with a simple structure to solve the problem that the sample whose radius to thickness ratio k is less than 6.1 and is greatly affected by the heat dissipation of the side wall is required to be tested for heat dissipation performance by the applicant.

[0006] In order to achieve the above technical objectives, the following technical solutions are provided: a device for detecting the heat dissipation performance of a metal material, comprising a bracket assembly, the bracket assembly comprising a bracket base fixed on the ground, a first bracket and a second bracket being arranged on the bracket base, the first bracket being arranged with a constant temperature water tank, the second bracket being arranged with a clamping, conveying and lifting mechanism, the clamping, conveying and lifting mechanism being located above the constant temperature water tank, the clamping, conveying and lifting mechanism comprising a sample clamping area, a cooling temperature test assembly located above the sample clamping area, and a heating temperature test assembly located below the sample clamping area, and when the sample clamping area is close to the upper surface of the liquid in the constant temperature water tank, a three-dimensional steady-state heat transfer model is constructed among the cooling temperature test assembly, the sample clamping area, the heating temperature test assembly and the surrounding of the sample clamping area.

[0007] In an operative manner, the clamping and conveying lifting mechanism includes a clamping and conveying mechanism fixed on one side of the second bracket and a lifting mechanism fixed on the other side of the second bracket; the lifting mechanism includes a lifting base arranged on the second bracket, a lifting cylinder having an "L"-shaped support base fixed at its end is fixed on the lifting base, a sample support block is arranged on the support base, and a first temperature sensor contained in a heating temperature testing assembly is arranged on the sample support block.

[0008] In an practicable manner, the clamping and conveying mechanism includes a lateral displacement cylinder fixed on the second bracket, a clamping base with a guide mechanism is fixed on the output end of the lateral displacement cylinder, and two left clamping units and right clamping units arranged opposite to each other are arranged on the clamping base. The sample located in the left clamping unit is delivered into the sample clamping area by the movement of the lateral displacement cylinder; and the sample located on the sample support block is delivered out of the sample clamping area by the right clamping unit by the movement of the lateral displacement cylinder.

[0009] In an practicable manner, both the left clamping unit and the right clamping unit have a small cylinder with a bidirectional telescopic rod, a clamping rod is fixed at the end of each telescopic rod, and at least two clamping fingers in the vertical direction are arranged on the clamping rod, and a rotating wheel is arranged at the lower end of the clamping finger for easy transportation.

[0010] In an practicable manner, a guide is provided at the right end of each clamping rod of the right clamping unit.

[0011] In an practicable manner, the guide mechanism includes a rail disposed on the second bracket, and a clamping groove fixed on the clamping base for clamping the rail.

[0012] In an practicable manner, an electric heating pipe is coiled inside the constant temperature water tank close to the inner wall of the constant temperature water tank, and a plurality of water tank temperature sensors are arranged in a vertical direction on one side surface inside the constant temperature water tank; the water tank temperature sensor located above the liquid surface is included in the cooling temperature test assembly.

[0013] In an practicable manner, a heat flow sensor located above the liquid level is provided on the other side of the constant temperature water tank.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] By immersing the sample in the solution for heating, the sample can be heated quickly and evenly, ensuring that the sample can be heated quickly and in all directions. Then, the sample is taken out of the solution, and the bottom of the sample is placed close to the surface of the solution. The temperature change parameters of the upper surface of the sample after heating are detected. The present application places the sample above the heated solution so that the gas flow rate around the sample is uniformly upward. And by measuring the time required for the sample to be immersed in the solution, the thickness L of the sample can be obtained.

[0016] The whole structure is simple, and it is very convenient to use for detection. Moreover, the sample testing time is short and more parameters can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 1 bracket assembly, 11 bracket base, 12 first bracket, 13 second bracket,

[0018] 2 constant temperature water tanks, 21 electric heating pipes,

[0019] 3 clamping and conveying lifting mechanism, 31 clamping and conveying mechanism, 311 lateral displacement cylinder, 312 guide mechanism, 3121 track, 3122 clamping groove,

[0020] 313 clamping base, 314 left clamping unit, 315 right clamping unit, 3151 small cylinder, 3152 telescopic rod, 3153 clamping rod, 3154 clamping finger, 3155 rotating wheel,

[0021] 32 lifting mechanism, 321 lifting base, 322 supporting base, 323 lifting cylinder, 324 sample support block,

[0022] 4 sample clamping area, 5 cooling temperature test component, 6 heating temperature test component,

[0023] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0024] Figure 2 This is a schematic diagram of the clamping, conveying and lifting mechanism in this embodiment;

[0025] Figure 3 This is a schematic diagram of the lifting mechanism in this embodiment;

[0026] Figure 4 This is a schematic diagram of the clamping and conveying mechanism of the utility model;

[0027] Figure 5 It is a structural schematic diagram of a constant temperature water tank;

[0028] Figure 6 for Figure 5 Side view of

[0029] Figure 7 for Figure 6 A cross-sectional view taken at AA, and a schematic diagram showing the arrangement of the sensors; DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] like Figure 1 The embodiment shown is a device for detecting the heat dissipation performance of a metal material, comprising a bracket assembly 1, the bracket assembly 1 comprising a bracket base 11 fixed on the ground, a first bracket 12 and a second bracket 13 being arranged on the bracket base 11, a constant temperature water tank 2 being arranged on the first bracket 12, a clamping, conveying and lifting mechanism 3 being arranged on the second bracket 13, the clamping, conveying and lifting mechanism 3 being located above the constant temperature water tank 2, the clamping, conveying and lifting mechanism 3 comprising a sample clamping area 4, a cooling temperature test assembly 5 being located above the sample clamping area 4, and a heating temperature test assembly 6 being located below the sample clamping area 4, and when the sample clamping area 4 is in close contact with the upper surface of the liquid in the constant temperature water tank 2, a three-dimensional steady-state heat transfer model is constructed among the cooling temperature test assembly 5, the sample clamping area 4, the heating temperature test assembly 6 and the surrounding areas of the sample clamping area 4.

[0032] In this embodiment, if Figure 2 The clamping, conveying and lifting mechanism 3 shown includes a clamping, conveying mechanism 31 fixed on one side of the second bracket 13 and a lifting mechanism 32 fixed on the other side of the second bracket 13. Figure 3 The lifting mechanism 32 shown includes a lifting base 321 disposed on the second bracket 13, a lifting cylinder 323 having an L-shaped support base 322 fixed at its end is fixed on the lifting base 321, and a sample support block 324 is disposed on the support base 322. The sample support block 324 is provided with a first temperature sensor included in the heating temperature test assembly 6.

[0033] Among them, Figure 4The clamping and conveying mechanism 31 shown includes a lateral displacement cylinder 311 fixed on the second bracket 13, and a clamping base 313 with a guide mechanism 312 is fixed on the output end of the lateral displacement cylinder 311. The guide mechanism 312 includes a track 3121 arranged on the second bracket 13, and a clamping groove 3122 fixed on the clamping base 313 for clamping the track 3121. When the lateral displacement cylinder 311 is working, the clamping groove 3122 slides on the clamping track 3121 for guiding and stabilizing.

[0034] Then, two left clamping units 314 and right clamping units 315 arranged opposite to each other are provided on the clamping base 313. The sample located in the left clamping unit 314 is sent into the sample clamping area 4 by the movement of the lateral displacement cylinder 311; and the sample located on the sample support block 324 is sent out of the sample clamping area 4 by the right clamping unit 315 by the movement of the lateral displacement cylinder 311.

[0035] The specific structures of the left clamping unit 314 and the right clamping unit 315 are both equipped with a small cylinder 3151 with a bidirectional telescopic rod 3152, that is, a small cylinder 3151 is fixed on the clamping base 313, and the telescopic rods 3152 on both sides are perpendicular to the sample conveying direction; a clamping rod 3153 is fixed at the end of each telescopic rod 3152, and two clamping fingers 3154 in the vertical direction are arranged on the clamping rod 3153, and a rotating wheel 3155 is arranged at the lower end of the clamping fingers 3154 for easy conveying. In this embodiment, a guide is arranged at the right end of each clamping rod 3153 of the right clamping unit 315.

[0036] like Figure 5 , Figure 6 and Figure 7 The thermostatic water tank 2 shown has an electric heating pipe 21 coiled in it close to the inner wall of the thermostatic water tank 2. A plurality of water tank temperature sensors are arranged vertically on one side of the thermostatic water tank 2; the water tank temperature sensor located above the liquid surface is included in the cooling temperature test assembly 5. A heat flow sensor located above the liquid surface is arranged on the other side of the thermostatic water tank 2.

[0037] The method for measuring the heat dissipation performance of metal materials using this embodiment is as follows:

[0038] Step 1: Sampling: The sample to be tested is aligned with the left clamping unit 314, the small cylinder 3151 in the left clamping unit 314 is adjusted, and then the telescopic rod 3152 is contracted, the clamping rod 3153 clamps the sample to be tested, and then the lateral displacement cylinder 311 is moved to send the sample to be tested into the sample clamping area 4, the telescopic rod 3152 is extended, the clamping rod 3151 releases the sample to be tested, and the sample to be tested enters the sample support block 324.

[0039] Step 2: Heating: the lifting cylinder 323 immerses the sample to be tested placed on the sample support block 324 into the heated constant temperature water tank 2, and takes out the sample to be tested after standing for a period of time.

[0040] In step three, after the sample to be tested is taken out, the supporting base 322 for support is still located in the liquid, and the sample support block 324 is located above the surface of the liquid. Specifically, the sample to be tested is located above the surface of the liquid, so that it is in a stable environment, and the upper surface can dissipate heat. In this state, the relevant required data are measured, and the detected data include T2 collected by the first temperature sensor, T1 and T3 collected by the water tank temperature sensor, the heat flux density q0 detected by the heat flux sensor, and the heat dissipation heat flux density q1 of the upper surface. A cylinder with a slow and known telescopic speed is used as the lifting cylinder 323, and the thickness L is measured by the time the sample is immersed in the solution.

[0041] Step 4: Calculate and sort out the relevant measured data, and fill the relevant data into Formula 1 for calculation to obtain the thermal conductivity, so as to determine the heat dissipation performance of the sample.

[0042] The above will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation.

[0043] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.

Claims

1. A device for detecting the heat dissipation performance of a metal material, comprising a bracket assembly (1), characterized in that: The support assembly (1) comprises a support base (11) fixed on the ground, a first support (12) and a second support (13) are arranged on the support base (11), a constant temperature water tank (2) is arranged on the first support (12), a clamping, conveying and lifting mechanism (3) is arranged on the second support (13), the clamping, conveying and lifting mechanism (3) is located above the constant temperature water tank (2), the clamping, conveying and lifting mechanism (3) comprises a sample clamping area (4), a cooling temperature test assembly (5) located above the sample clamping area (4), and a heating temperature test assembly (6) located below the sample clamping area (4), and when the sample clamping area (4) is in close contact with the upper surface of the liquid in the constant temperature water tank (2), a three-dimensional steady-state heat transfer model is constructed among the cooling temperature test assembly (5), the sample clamping area (4), the heating temperature test assembly (6) and the surrounding of the sample clamping area (4).

2. The heat dissipation performance detection device of metal materials according to claim 1, characterized in that: The clamping and conveying lifting mechanism (3) comprises a clamping and conveying mechanism (31) fixed on one side of the second bracket (13) and a lifting mechanism (32) fixed on the other side of the second bracket (13); the lifting mechanism (32) comprises a lifting base (321) arranged on the second bracket (13), a lifting cylinder (323) having an "L"-shaped support base (322) fixed at one end thereof being fixed on the lifting base (321), a sample support block (324) being arranged on the support base (322), and a first temperature sensor contained in the heating temperature test assembly (6) being arranged on the sample support block (324).

3. The heat dissipation performance detection device of metal materials according to claim 2, characterized in that: The clamping and conveying mechanism (31) comprises a transverse displacement cylinder (311) fixed on the second bracket (13); a clamping base (313) with a guide mechanism (312) is fixed on the output end of the transverse displacement cylinder (311); two left clamping units (314) and right clamping units (315) arranged opposite to each other are arranged on the clamping base (313); the sample located in the left clamping unit (314) is conveyed into the sample clamping area (4) by the movement of the transverse displacement cylinder (311); and the sample located on the sample support block (324) is conveyed out of the sample clamping area (4) by the right clamping unit (315) by the movement of the transverse displacement cylinder (311).

4. The heat dissipation performance detection device of metal materials according to claim 3, characterized in that: The left clamping unit (314) and the right clamping unit (315) both have a small cylinder (3151) with a bidirectional telescopic rod (3152), and a clamping rod (3153) is fixed at the end of each telescopic rod (3152). The clamping rod (3153) is provided with at least two clamping fingers (3154) in the vertical direction, and the lower end of the clamping finger (3154) is provided with a rotating wheel (3155) for easy transportation.

5. The heat dissipation performance detection device of metal materials according to claim 4, characterized in that: A guide is provided at the right end of each clamping rod (3153) of the right clamping unit (315).

6. The heat dissipation performance detection device of metal materials according to claim 3, characterized in that: The guide mechanism (312) comprises a track (3121) arranged on the second bracket (13), and a clamping groove (3122) fixed on the clamping base (313) for clamping the track (3121).

7. The heat dissipation performance detection device of metal materials according to claim 1, characterized in that: An electric heating pipe (21) is coiled inside the constant temperature water tank (2) and is close to the inner wall of the constant temperature water tank (2). A plurality of water tank temperature sensors are arranged in a vertical direction on one side surface of the constant temperature water tank (2); wherein the water tank temperature sensor located above the liquid surface is included in the cooling temperature test assembly (5).

8. The heat dissipation performance detection device of metal material according to claim 7, characterized in that: A heat flow sensor located above the liquid surface is arranged on the other side surface of the constant temperature water tank (2).

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