Test device and test method for evaluating performance of corrugated strip heat transfer device

Abstract

The application relates to a test device and a test method for evaluating the performance of a corrugated strip heat transfer device, which comprises a fixing unit for fixing the corrugated strip heat transfer device to be tested, a heating unit, which is attached to the heat absorbing end of the corrugated strip heat transfer device and used for heating the heat absorbing end, a cooling unit, which is attached to the heat releasing end of the corrugated strip heat transfer device and used for cooling the heat releasing end, a detection unit, which is located on one side of the heat absorbing end and the heat releasing end respectively and used for measuring the temperature of the heat absorbing end and the heat releasing end, and a display unit, which is electrically connected with the detection unit and used for displaying the temperature of the heat absorbing end and the heat releasing end. The application can obtain the heat transfer performance parameters of the corrugated strip heat transfer device and provide data support for the optimization and updating of the heat transfer device.

Description

Technical Field

[0001] This invention relates to the field of heat transfer device performance testing technology, specifically to a testing device and method for evaluating the performance of a corrugated strip heat transfer device. Background Technology

[0002] Severe overheating in the overhanging windings of a motor is a major factor limiting further increases in motor power. A heat dissipation solution using corrugated strip phase-change heat transfer devices combined with thermally conductive adhesive to wrap the overhanging windings is an effective way to achieve efficient motor heat dissipation. However, the current lack of suitable performance evaluation testing equipment and methods for corrugated strip heat transfer devices hinders data support for device optimization and updates, thus slowing down device iteration. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to propose a test device and test method for evaluating the performance of corrugated strip heat transfer devices, which can obtain the heat transfer performance parameters of corrugated strip heat transfer devices and provide data support for the optimization and upgrading of heat transfer devices.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This invention provides a testing device for evaluating the performance of a corrugated strip phase change heat transfer device, comprising: a fixing unit for fixing the corrugated strip heat transfer device to be tested; a heating unit, which is attached to the heat-absorbing end of the corrugated strip heat transfer device for heating the heat-absorbing end; a cooling unit, which is attached to the heat-releasing end of the corrugated strip heat transfer device for cooling the heat-releasing end; a detection unit, which is located on one side of the heat-absorbing end and the heat-releasing end respectively, for measuring the temperature of the heat-absorbing end and the heat-releasing end; and a display unit, which is electrically connected to the detection unit for displaying the temperature of the heat-absorbing end and the heat-releasing end.

[0006] A preferred embodiment of the present invention further includes a test bench, which has an area for accommodating a heating unit, a cooling unit, and a detection unit, with the heating unit, cooling unit, and detection unit located within the test bench.

[0007] A preferred embodiment of the present invention is that the heating unit includes a heating block and a heating rod for heating by electricity. The heating block has a heating hole for inserting the heating rod, and a thermally conductive adhesive layer is disposed in the heating hole. One surface of the heating block is attached to the heat-absorbing end.

[0008] A preferred embodiment of the present invention is that the cooling unit includes a liquid cooling plate and a constant temperature water tank, the liquid cooling plate and the constant temperature water tank are connected by a pipe, and one surface of the liquid cooling plate is in contact with the heat dissipation end.

[0009] A preferred embodiment of the present invention is that the detection unit is a K-type thermocouple and the display unit is a computer.

[0010] This invention provides a test method for evaluating the performance of a corrugated belt phase change heat transfer device, which includes the following steps:

[0011] S00: Measure the equivalent heat transfer length L and effective cross-sectional area A of the corrugated strip heat transfer device, and fix the corrugated strip heat transfer device.

[0012] S10: A heating unit with constant power P heats the heat-absorbing end of the corrugated strip heat transfer device, and a cooling unit with cooling temperature T cools the heat-releasing end of the corrugated strip heat transfer device.

[0013] S20: Measure the temperature of the heat absorption end and the heat release end;

[0014] S30: After the temperature changes of the heat absorption end and the heat release end stabilize, record the temperature of the heat absorption end and the heat release end after stabilization, and calculate the temperature difference ΔT.

[0015] S40: The heat transfer coefficient K of the corrugated strip heat transfer device under constant power P is obtained according to the formula (constant power P * equivalent heat transfer length L) / (effective cross-sectional area A * temperature difference ΔT).

[0016] A preferred embodiment of the present invention is that, in S10, the constant power P is 25-60W and the cooling temperature T is 30-50℃.

[0017] A preferred embodiment of the present invention is that, in S20, the temperature change stabilizes within 5-15 minutes.

[0018] A preferred embodiment of the present invention involves applying thermally conductive adhesive between the heating unit and the heat-absorbing end, and between the cooling unit and the heat-releasing end, in step S10. The present invention also provides another test method for evaluating the performance of a corrugated belt phase change heat transfer device, comprising the following steps:

[0019] S00: Fixed corrugated strip heat transfer device;

[0020] S10: The heat-dissipating end of the corrugated strip heat transfer device is cooled by a cooling unit with a cooling temperature T, and the heat-absorbing end of the corrugated strip heat transfer device is heated by a heating unit with a power value of P.

[0021] S20: Measure the temperature of the heat absorption end and the heat release end. After the temperature changes of the heat absorption end and the heat release end stabilize, gradually increase the power value until the temperature of the heat absorption end and the heat release end can no longer stabilize.

[0022] S30: Record the power value P at this time to obtain the limiting heat transfer power P of the corrugated ribbon heat transfer device at the cooling temperature T. max .

[0023] The beneficial effects of this invention are:

[0024] This invention proposes a testing device and method for evaluating the performance of a corrugated ribbon heat transfer device. The testing device includes a heating unit and a cooling unit closely attached to the heat-absorbing and heat-releasing ends of the corrugated ribbon heat transfer device. Temperature is detected by a detection unit located on one side of each end, and the detected temperature data is output to a display unit. The heat transfer coefficient and ultimate heat transfer power of the corrugated ribbon heat transfer device can be calculated using formulas, enabling accurate testing of the heat transfer performance of the device and providing data support for its optimization and upgrading. In addition, this invention has the following advantages: 1. The device is simple and easy to manufacture, and the various components are inexpensive and easy to implement; 2. Operation is simple and convenient; 3. The structure is simple and assembly requirements are not high. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a perspective view of the corrugated strip heat transfer device of Embodiment 1; Figure 2 This is a schematic diagram of the test device for evaluating the performance of the corrugated strip heat transfer device in Example 1.

[0027] Figure 3 This is a perspective view of the test bench according to Example 1;

[0028] Figure 4 This is a front view of the test bench in Example 1;

[0029] Figure 5 This is a schematic diagram of the test method for the heat transfer coefficient K in Example 1;

[0030] Figure 6 This is a schematic diagram of the test method for the ultimate heat transfer power in Example 1;

[0031] Figure 7 This is a schematic diagram of temperature change in the test method for the ultimate heat transfer power in Example 1.

[0032] In the picture:

[0033] 1-Fixing unit; 11-Upper stone slab; 12-Lower stone slab; 2-Heating unit; 21-Heating block; 22-Heating rod; 3-Cooling unit; 31-Liquid cooling plate; 32-Constant temperature water tank; 4-Detection unit; 5-Display unit; 61-Heat absorption end; 62-Heat release end. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figure 1 As shown, the corrugated strip heat transfer device, as a novel type of heat transfer device, is used for motor heat dissipation. One end of the corrugated strip heat transfer device is the heat absorption end 61, which is in close contact with the suspended winding inside the motor, and the other end is the heat dissipation end 62, which is in close contact with the motor casing. Several corrugated strip heat transfer devices are arranged to surround the suspended winding, depending on the size and requirements of the motor. This technical solution rapidly guides the concentrated heat generated by the suspended winding to the motor casing by adding an extra heat transfer path, thereby improving the heat dissipation efficiency and preventing heat accumulation in the suspended winding, thus further increasing the motor's power. The corrugated strip heat transfer device in this embodiment is a phase change heat transfer device, which can have higher heat transfer efficiency.

[0037] like Figure 2-4 As shown in this embodiment, a test device for evaluating the performance of a corrugated strip heat transfer device is provided. The pipes and electrical connections within the test device are all... Figure 4 The test apparatus is equipped with a test platform, which is connected by lines to better integrate the various units. The test platform has an area to accommodate the heating unit 2, cooling unit 3, and detection unit 4. The fixing unit 1, heating unit 2, cooling unit 3, and detection unit 4 are located inside the test platform. Integrating the various units facilitates the overall integration of the apparatus and makes it convenient for use and measurement.

[0038] The test stand is made of synthetic stone slabs. The fixing unit 1 is composed of an upper stone slab 11 and a lower stone slab 12 clamped together. Since the thermal conductivity of the synthetic stone slab is only 0.25 W / m·K, it can be approximately assumed that all the heat generated by the heating unit is transferred to the corrugated strip heat transfer device.

[0039] The device includes a fixing unit 1 for fixing the corrugated strip heat transfer device under test, with a clamping structure matching the device; a heating unit 2, which is in close contact with the heat-absorbing end of the device, for heating the heat-absorbing end; a cooling unit 3, which is in close contact with the heat-releasing end of the device, for cooling the heat-releasing end; a detection unit 4, located on one side of both the heat-absorbing and heat-releasing ends, for measuring the temperatures of the heat-absorbing and heat-releasing ends; and a display unit 5, electrically connected to the detection unit 4, for displaying the temperatures of the heat-absorbing and heat-releasing ends. In this embodiment, three heat-absorbing ends and two heat-releasing ends are measured. Therefore, three heating units, two cooling units, and five detection units are provided.

[0040] Specifically, the heating unit 2 includes a heating block 21 and a heating rod 22 for electrically heated components. The heating block 21 is embedded in the receiving area of ​​the test stage. The heating block 21 has heating holes for inserting the heating rod 22, and a thermally conductive adhesive layer is disposed in the heating holes. One surface of the heating block 21 is in contact with the heat-absorbing end. This structural arrangement facilitates the rapid transfer of heat generated by the heating rod to the heat-absorbing end, ensuring the accuracy of data measurement.

[0041] Specifically, the cooling unit 3 includes a liquid-cooled plate 31 and a constant-temperature water tank 32. The liquid-cooled plate 31 is embedded in the receiving area of ​​the test bench. The liquid-cooled plate 31 and the constant-temperature water tank 32 are connected by pipes, with one surface of the liquid-cooled plate 31 in contact with the heat-dissipating end. The inlet of the liquid-cooled plate is connected to a water pump via a hose, and the water pump and the constant-temperature water tank are connected via a hose. The water pump provides power to the liquid-cooled working fluid circuit. The outlet of the liquid-cooled plate is connected to a hose that extends to the constant-temperature water tank. The liquid-cooled plate, water pump, and constant-temperature water tank together constitute the liquid-cooled working fluid circuit. This structural arrangement facilitates the rapid removal of heat from the heat-dissipating end by the liquid-cooled plate, ensuring the accuracy of data measurement.

[0042] Specifically, detection unit 4 is a type K thermocouple, and display unit 5 is a computer. Type K thermocouples have advantages such as good linearity, large thermoelectric potential, high sensitivity, good stability and uniformity, strong oxidation resistance, and low price, making them ideal for quickly detecting temperature changes at the absorbing and exothermic ends. The type K thermocouple connects to a data acquisition card, which in turn connects to the computer. The type K thermocouple monitors the temperature at various points on the heat transfer device in real time and transmits the data to the computer. The computer can also calculate the required parameters.

[0043] like Figure 5 As shown, the specific testing method is as follows:

[0044] S00: Use vernier calipers to measure the equivalent heat transfer length L and effective cross-sectional area A of the corrugated strip heat transfer device. The equivalent heat transfer length L is the shortest distance traversed by the heat transfer device from the heat absorption end to the heat release end. The measured values ​​are: equivalent heat transfer length L = 120 mm; effective cross-sectional area A = 25 mm * 0.98 mm = 24.5 mm. 2 After measurement, the corrugated strip heat transfer device is fixed on the fixed unit.

[0045] S10: A heating unit with constant power P heats the heat-absorbing end of the corrugated strip heat transfer device, and a cooling unit with a cooling temperature T cools the heat-releasing end of the corrugated strip heat transfer device. In S10, the constant power P is 25-60W, and the cooling temperature T is 30-50℃. In this embodiment, P is 45W and T is 50℃. These values ​​are used to simulate the actual motor application environment.

[0046] S20: Measure the temperature of the heat absorption end and the heat release end;

[0047] S30: The temperature changes at the heat absorption end and the heat release end gradually stabilize after the device has been running for 8 minutes. Record the temperatures of the heat absorption end and the heat release end after stabilization, and take their average values. The values ​​are 59.35℃ for the heat absorption end and 54.12℃ for the heat release end. Calculate the temperature difference ΔT = 5.23℃.

[0048] S40: According to the formula (constant power P * equivalent heat transfer length L) / (effective cross-sectional area A * temperature difference ΔT), substituting the above values, the heat transfer coefficient K of the corrugated strip heat transfer device under constant power P is (45W * 120mm * 1000) / (24.5mm). 2 *5.23℃)=42143W / m·℃.

[0049] The above testing methods are designed to simulate the actual application environment of corrugated strip heat transfer devices, enabling research and development experiments based on actual application needs, and providing data support for the optimization and upgrading of heat transfer devices.

[0050] Preferably, in order to facilitate heat transfer in S10, thermally conductive adhesive is applied between the heating unit 2 and the heat-absorbing end, and between the cooling unit 3 and the heat-releasing end. This thermally conductive adhesive can improve the heat transfer effect, further simulating the actual use process, and also serves a fixing function.

[0051] In addition to measuring the heat transfer coefficient K of the corrugated strip heat transfer device under constant power, the limiting heat transfer power was further measured. For example... Figure 6-7 As shown, the specific method is as follows:

[0052] The cooling temperature of the fixed cooling unit is 50℃. Initially, the heating power of the heating unit is 15W. After the temperature changes at the heat absorption and heat release ends stabilize at this power, the heating power of the heating unit is gradually increased in increments of 10℃, from 15W to 25W to 35W, until the temperatures at the heat absorption and heat release ends no longer stabilize over time. At this point, the power value is 85W. Therefore, the limiting heat transfer power P of the corrugated strip heat transfer device at a cooling temperature of 50℃ can be calculated. max With a value between approximately 75-85W, it can be assumed that when the corrugated strip heat transfer device is used for external cooling at 50°C, and the cantilever winding transfers no more than 75W to the heat transfer component, the cantilever winding can stably dissipate heat and will not cause motor runaway due to heat accumulation. Alternatively, the value of P can be determined by gradually narrowing the range from 75-85W. max The accurate value.

[0053] It should be further noted that the device described above, in addition to constant power heating via the heating unit, can also perform constant temperature heating via the heating unit according to actual application conditions. Conversely, the cooling unit can also perform constant power cooling via the cooling unit according to actual application conditions. Through different adjustments, different heat transfer parameters can be obtained for development purposes according to user needs, and are not limited to the heat transfer coefficient and limiting heat transfer power mentioned above. All of the above applications are within the scope of use of the measuring device.

[0054] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A testing device for evaluating the performance of a corrugated strip heat transfer device, characterized in that, include: The test bench has an area for accommodating the heating unit, cooling unit, and detection unit. The fixing unit, heating unit, cooling unit, and detection unit are located inside the test bench. The fixing unit is used to fix the corrugated strip heat transfer device to be tested. The fixing unit is composed of an upper stone plate and a lower stone plate clamped together. Its clamping structure is matched with the corrugated strip heat transfer device to be tested. A heating unit is attached to the heat-absorbing end of the corrugated strip heat transfer device for heating the heat-absorbing end; A cooling unit is attached to the heat-dissipating end of the corrugated strip heat transfer device and is used to cool the heat-dissipating end. A detection unit is located on one side of the heat-absorbing end and the heat-releasing end, respectively, and is used to measure the temperature of the heat-absorbing end and the heat-releasing end; The display unit, which is electrically connected to the detection unit, is used to display the temperatures of the heat-absorbing end and the heat-releasing end.

2. The testing apparatus according to claim 1, characterized in that: The heating unit includes a heating block and a heating rod for heating by electricity; The heating block is provided with a heating hole for inserting the heating rod, and a thermally conductive adhesive layer is provided in the heating hole; One surface of the heating block is in contact with the heat-absorbing end.

3. The testing apparatus according to claim 1, characterized in that: The cooling unit includes a liquid cooling plate and a constant temperature water tank; The liquid cooling plate and the constant temperature water tank are connected by a pipe, and one surface of the liquid cooling plate is in contact with the heat dissipation end.

4. The testing apparatus according to claim 1, characterized in that: The detection unit is a type K thermocouple, and the display unit is a computer.

5. A test method for evaluating the performance of a corrugated strip heat transfer device using the test apparatus described in any one of claims 1-4, characterized in that, Includes the following steps: S00: Measure the equivalent heat transfer length L and effective cross-sectional area A of the corrugated strip heat transfer device, and fix the corrugated strip heat transfer device. S10: The heat-absorbing end of the corrugated strip heat transfer device is heated by a heating unit with constant power P, and the heat-releasing end of the corrugated strip heat transfer device is cooled by a cooling unit with cooling temperature T. S20: Measure the temperature of the heat-absorbing end and the heat-releasing end; S30: After the temperature changes of the heat-absorbing end and the heat-releasing end stabilize, record the stable temperatures of the heat-absorbing end and the heat-releasing end, and calculate the temperature difference ΔT. S40: The heat transfer coefficient K of the corrugated strip heat transfer device under constant power P is obtained according to the formula (constant power P * equivalent heat transfer length L) / (effective cross-sectional area A * temperature difference ΔT).

6. The test method according to claim 5, characterized in that: In S10, the constant power P is 25-60W, and the cooling temperature T is 30-50℃.

7. The test method according to claim 5, characterized in that: In S20, the temperature change stabilizes in 5-15 minutes.

8. The test method according to claim 5, characterized in that: In S10, thermally conductive adhesive is applied between the heating unit and the heat-absorbing end, and between the cooling unit and the heat-releasing end.

9. A test method for evaluating the performance of a corrugated strip heat transfer device using the test apparatus described in any one of claims 1-4, characterized in that, Includes the following steps: S00: Fixed corrugated strip heat transfer device; S10: The heat-dissipating end of the corrugated strip heat transfer device is cooled by a cooling unit with a cooling temperature T; the heat-absorbing end of the corrugated strip heat transfer device is heated by a heating unit with a power value of P. S20: Measure the temperature of the heat-absorbing end and the heat-releasing end. After the temperature of the heat-absorbing end and the heat-releasing end stabilizes, gradually increase the power value until the temperature of the heat-absorbing end and the heat-releasing end can no longer stabilize. S30: Record the power value P at this time, and obtain the limiting heat transfer power P of the corrugated ribbon heat transfer device at the cooling temperature T. max .

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