Microchannel radiator low-temperature flow resistance testing device

Abstract

This invention provides a low-temperature flow resistance testing device for microchannel radiators, comprising a control device and a testing device. The control device includes a temperature environment chamber, an electric valve, a manual valve, a filter, a check valve, and a computer. The testing device includes a temperature sensor, a pressure transmitter, and a differential pressure transmitter. This invention enables the testing of microchannel radiators under various low-temperature conditions, automatically adjusting the liquid coolant flow rate and inlet temperature according to set requirements during the testing process. This invention eliminates the drawbacks of manual control of various parameters, simultaneously satisfying low-temperature flow resistance testing under various conditions, thus improving the accuracy and efficiency of the test.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-temperature flow resistance test of airborne micro-channel radiator, and particularly relates to a device for low-temperature flow resistance test of airborne micro-channel radiator. BACKGROUND

[0002] The micro-channel radiator is an accessory designed for the aircraft environmental control system and is used for cooling high-temperature liquid. In the early stage of product development, due to lack of funds and related test technical support, the performance test of the product becomes a big problem. The biggest difficulty in the test is to keep the medium continuously and flow at a large flow rate under the condition of-35 DEG C. In order to ensure the smooth development of the product development plan, the low-temperature test can only be tested by the temporary assembly equipment artificially built.

[0003] However, the above test method also brings some problems:

[0004] 1. The existing equipment cannot simulate the test conditions of the test medium at-35 DEG C. The conventional test device can only be stably operated at several degrees below zero. When the temperature continues to decrease (for example, the aforementioned-35 DEG C), the temperature fluctuation of the medium becomes more and more obvious, which causes the test time to be prolonged or even the test to fail.

[0005] 2. The original test uses a turbine flowmeter to measure the liquid flow. Under the condition of low-temperature medium, the turbine flowmeter often appears unstable. When the medium flow range is large, the correct flow value of the medium cannot be accurately measured.

[0006] 3. The medium temperature is not stable under the condition of low temperature, which causes the test data to be unstable.

[0007] In view of the above problems, a more scientific, effective and practical test device must be provided to ensure that the test is more accurate, convenient and real under the premise of meeting the test conditions. SUMMARY

[0008] In order to solve the above problems, achieve stable and continuous test under the required test conditions, and automatically adjust the parameters of the test medium, collect and record the test parameters meeting the test requirements, the present application aims to provide a low-temperature flow resistance test device for micro-channel radiator.

[0009] The present application is realized by the following technical solutions:

[0010] The low-temperature flow resistance test device for micro-channel radiator comprises an environmental temperature box, a micro-channel radiator inlet end pressure test pipeline and a micro-channel radiator outlet end pressure test pipeline, and a liquid storage tank and a micro-channel radiator to be tested are arranged in the environmental temperature box.

[0011] The outlet end of the liquid storage tank is connected with the inlet of the micro-channel radiator to be tested through a micro-channel radiator inlet medium pipeline, and a manual valve, an electric pump, a one-way valve, a temperature sensor and an electric valve are sequentially arranged on the micro-channel radiator inlet medium pipeline, and the temperature sensor and the electric valve are located outside the environmental temperature box, and the manual valve, the electric pump and the one-way valve are located inside the environmental temperature box.

[0012] The inlet end of the liquid storage tank is connected with the outlet of the micro-channel radiator to be tested through a micro-channel radiator outlet medium pipeline, and a filter is arranged on the micro-channel radiator outlet medium pipeline.

[0013] One end of the micro-channel radiator inlet end pressure test pipeline is connected with the micro-channel radiator inlet end medium pipeline, and the connection is located inside the environmental temperature box, and the other end is connected with the first end of the differential pressure transmitter through a manual valve, and the manual valve and the differential pressure transmitter are located outside the environmental temperature box.

[0014] One end of the micro-channel radiator outlet end pressure test pipeline is connected with the micro-channel radiator outlet end medium pipeline, and the connection is located inside the environmental temperature box, and the other end is connected with the second end of the differential pressure transmitter through a manual valve, and the manual valve and the differential pressure transmitter are located outside the environmental temperature box.

[0015] The first end of the differential pressure transmitter is also connected with a pressure transmitter, and the pressure transmitter is located outside the environmental temperature box.

[0016] Further, the micro-channel radiator inlet end medium pipeline further includes a stainless steel hose, and the electric valve is connected with the inlet of the micro-channel radiator to be tested through the stainless steel hose.

[0017] Further, the micro-channel radiator inlet end medium pipeline is split into multiple secondary micro-channel radiator inlet end medium pipelines at the outlet end of the one-way valve, each secondary micro-channel radiator inlet end medium pipeline includes an electric valve, and the electric valve is located outside the environmental temperature box, and each secondary micro-channel radiator inlet end medium pipeline is connected with an inlet of the micro-channel radiator to be tested.

[0018] The micro-channel radiator outlet end medium pipeline is split into multiple secondary micro-channel radiator outlet end medium pipelines at the inlet end of the filter, and each secondary micro-channel radiator outlet end medium pipeline is connected with an outlet of the micro-channel radiator to be tested.

[0019] Each secondary micro-channel radiator inlet end medium pipeline corresponds to a micro-channel radiator inlet end pressure test pipeline, each secondary micro-channel radiator outlet end medium pipeline corresponds to a micro-channel radiator outlet end pressure test pipeline, the plurality of micro-channel radiator inlet end pressure test pipelines are simultaneously connected with the first end of the differential pressure transmitter, and the plurality of micro-channel radiator outlet end pressure test pipelines are simultaneously connected with the second end of the differential pressure transmitter.

[0020] Further, the ambient temperature box, the electric pump, the electric valve, the temperature sensor, the pressure transmitter and the differential pressure transmitter are electrically connected with the computer.

[0021] Further, the liquid storage tank is provided with a partition plate, and the inlet end and the outlet end of the liquid storage tank are located on the two sides of the partition plate. The partition plate changes the internal structure of the liquid storage tank, on the one hand, increases the flow process from the inlet end to the outlet end of the liquid storage tank (lengthens the required travel distance of the cooling liquid flow, thereby prolonging the heat exchange time), so that it better exchanges heat with the low-temperature environment to maintain the low-temperature characteristics of the cooling liquid, on the other hand, the partition plate divides the internal structure of the liquid storage tank into a liquid return area and a liquid outlet area, the cooling liquid in the two areas exchanges heat through the partition plate, further, there is a height difference between the liquid return liquid level and the liquid outlet liquid level on the two sides of the partition plate, and the cooling liquid forms a drop when flowing from one area to another area across the partition plate, which increases the surface area of the cooling liquid and enables the cooling liquid to have a larger heat exchange area with the ambient temperature box. The number of partition plates can be one or more. When there are multiple partition plates, the multiple partition plates are arranged in parallel and at intervals, and the purpose is still to increase the flow process and contact area of the cooling liquid in the liquid storage tank, while playing a heat exchange role.

[0022] The present application improves the internal structure of the liquid storage tank and places as many components as possible that affect temperature and flow fluctuations in the temperature environment box, thereby reducing the influence of temperature and flow fluctuations on test accuracy.

[0023] Compared with the prior art, the micro-channel radiator low-temperature flow resistance test device has the following characteristics:

[0024] 1. The internal structure of the liquid storage tank in the electric supercharging system is improved, the contact area and flow process of the test medium (cooling liquid) in the liquid storage tank are increased by arranging a partition plate, the medium is more fully affected by the ambient temperature box, the control efficiency under low-temperature conditions is improved, the requirements of large flow and low-temperature flow are met, and thus the test efficiency and the accuracy of test data are improved.

[0025] 2. Except for the sensors and some control valves, which are located outside the temperature environment chamber, all other components (liquid storage tank, electric pump, microchannel radiator under test, and stainless steel hoses, etc.) are located inside the same temperature environment chamber. The purpose is to ensure that the coolant is kept at the low temperature required for the test.

[0026] 3. The coolant in the testing device is recycled, and the test pipeline forms a loop. On the one hand, this reduces the volume of the storage tank and abandons the traditional approach of cooling the coolant and then allowing it to flow in one direction (which requires a large storage tank volume). On the other hand, the circulating flow can establish a relatively stable coolant flow state, reducing fluctuations in coolant temperature and flow rate.

[0027] 4. Multiple independent secondary pipelines are set up in the same test device for different flow rates, which avoids the impact on accuracy when using the same pipeline to test different flow rates, and also improves the test efficiency.

[0028] 5. The introduction of computer to control and record the experiment eliminates the drawbacks of the original purely manual adjustment of various parameters, enabling precise control of various experimental input conditions. The entire device is simple in structure, easy to assemble, low in cost, and easy to operate.

[0029] 6. The computer control software for the microchannel radiator low-temperature flow resistance testing device is based on the LabVIEW open-source platform and was custom-developed according to the flow resistance testing requirements of microchannel radiators, making it unique and practical. The software interface is graphical, unifying complex test parameters into a single interface, and includes graphic animations to vividly and graphically reflect the actual data of the radiator under real operating conditions. The control software can control corresponding mechanisms (including valves, electric pumps, ambient temperature chambers, etc.) to perform actions according to test requirements to complete the entire test, greatly improving work efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a low-temperature flow resistance testing device for microchannel heat sinks;

[0031] Figure 2 This is a schematic diagram of the internal partition installation of the liquid storage tank;

[0032] In the diagram: 1. Electric valve, 2. Manual valve, 3. Electric pump, 4. Filter, 5. Stainless steel hose, 6. Check valve, 7. Temperature sensor, 8. Pressure transmitter, 9. Differential pressure transmitter, 10. Liquid storage tank, 11. Temperature environment chamber, 12. Microchannel heat sink to be tested. Detailed Implementation

[0033] The embodiments of the present invention are further described below with reference to the accompanying drawings, but the scope of protection of the claims of the present invention is not limited to the contents listed in this embodiment.

[0034] like Figure 1 As shown, the low-temperature flow resistance testing device for microchannel radiators includes an ambient temperature chamber 11, a pressure testing pipeline at the inlet end of the microchannel radiator, and a pressure testing pipeline at the outlet end of the microchannel radiator. The ambient temperature chamber 11 contains a liquid storage tank 10 and a microchannel radiator 12 to be tested. The outlet end of the liquid storage tank 10 is connected to the inlet end of the microchannel radiator 12 via a medium pipeline at the inlet end of the microchannel radiator. A manual valve 2, an electric pump 3, a check valve 6, a temperature sensor 7, and an electric valve 1 are sequentially installed on the medium pipeline at the inlet end of the microchannel radiator. The temperature sensor 7 and the electric valve 1 are located outside the ambient temperature chamber 11, while the manual valve 2, the electric pump 3, and the check valve 6 are located inside the ambient temperature chamber 11. The inlet end of the liquid storage tank 10 is connected to the inlet end of the microchannel radiator 12 via a medium pipeline at the outlet end of the microchannel radiator. The outlet connection of device 12 includes a filter 4 installed on the medium pipeline at the outlet end of the microchannel radiator; one end of the pressure test pipeline at the inlet end of the microchannel radiator is connected to the medium pipeline at the inlet end of the microchannel radiator, with the connection point located inside the ambient temperature chamber; the other end is connected to the first end of the differential pressure transmitter 9 via manual valve 2, with manual valve 2 and differential pressure transmitter 9 located outside the ambient temperature chamber 11; one end of the pressure test pipeline at the outlet end of the microchannel radiator is connected to the medium pipeline at the outlet end of the microchannel radiator, with the connection point located inside the ambient temperature chamber; the other end is connected to the second end of the differential pressure transmitter 9 via manual valve 2, with manual valve 2 and differential pressure transmitter 9 located outside the ambient temperature chamber 11; the first end of the differential pressure transmitter 9 is also connected to a pressure transmitter 8, which is located outside the ambient temperature chamber 11. The ambient temperature chamber 11, electric pump 3, electric valve 1, temperature sensor 7, pressure transmitter 8, and differential pressure transmitter 9 are electrically connected to a computer. Figure 2 As shown, a partition is installed in the liquid storage tank 10, with the inlet and outlet ends of the liquid storage tank 10 located on opposite sides of the partition. Figure 2 The middle arrow indicates the direction of coolant (oil) flow, and the dashed line represents the coolant level.

[0035] Specifically, the medium pipeline at the inlet end of the microchannel radiator also includes a stainless steel hose 5, and the electric valve 1 is connected to the inlet of the microchannel radiator 12 under test via the stainless steel hose 5.

[0036] Particularly, the micro-channel radiator inlet end medium pipeline is split into three secondary micro-channel radiator inlet end medium pipelines at the outlet end of the one-way valve 6, each of which includes an electric valve 1 and one stainless steel hose 5, and the electric valve 1 is located outside the environmental temperature box 11. Each of the secondary micro-channel radiator inlet end medium pipelines is connected to one inlet of the micro-channel radiator 12 to be tested. The micro-channel radiator outlet end medium pipeline is split into three secondary micro-channel radiator outlet end medium pipelines at the inlet end of the filter 4, each of which is connected to one outlet of the micro-channel radiator 12 to be tested. Each of the secondary micro-channel radiator inlet end medium pipelines corresponds to one micro-channel radiator inlet end pressure test pipeline, and each of the secondary micro-channel radiator outlet end medium pipelines corresponds to one micro-channel radiator outlet end pressure test pipeline. The plurality of micro-channel radiator inlet end pressure test pipelines are connected to the first end of the differential pressure transmitter 9 at the same time, and the plurality of micro-channel radiator outlet end pressure test pipelines are connected to the second end of the differential pressure transmitter 9 at the same time.

[0037] The micro-channel radiator low-temperature flow resistance test device keeps the liquid storage tank 10 (containing cooling liquid, i.e., oil liquid), the electric pump 3, the micro-channel radiator 12 to be tested, the micro-channel radiator inlet end pressure test pipeline and the micro-channel radiator outlet end pressure test pipeline in the condition of-55℃ for 4 hours through the temperature environmental box 11 to ensure the low temperature of the cooling liquid. The rotation speed of the electric pump 3 is controlled by the frequency converter of the electric pump 3, and the opening of the electric valve 1 is adjusted to meet the test cooling liquid flow requirement. The computer control system automatically detects and adjusts the medium temperature and flow and collects and records.

[0038] The control system of the micro-channel radiator low-temperature flow resistance test device mainly includes an environmental temperature system, an electric supercharging system, an electric control system and a computer control system. The specific requirements are shown in Table 1 and Table 2.

[0039] Table 1 Main working conditions of the micro-channel radiator low-temperature flow resistance test device

[0040] Serial number Item Parameter 1 Working environment temperature 0℃～+55℃ 2 Working environment humidity ≤ 90% RH 3 Power supply voltage AC 380V 4 Cooling electric supercharging pressure 0 ~ 1 MPa 5 Maximum flow of cooling liquid 120 L / min 6 Cooling liquid temperature -40℃～10℃

[0041] Table 2 Main technical parameters of the micro-channel radiator low-temperature flow resistance test device

[0042]

[0043] When the low-temperature flow resistance test is performed, the following procedures are followed:

[0044] 1. Install the microchannel radiator 12 to be tested on the bracket, and connect the coolant microchannel radiator inlet medium pipeline, the microchannel radiator outlet medium pipeline, the microchannel radiator inlet pressure test pipeline, and the microchannel radiator outlet pressure test pipeline accordingly.

[0045] 2. Based on the test requirements inlet temperature (the inlet temperature of the microchannel radiator 12 to be tested) set on the computer, the speed of the electric pump 3 is controlled by the frequency converter of the electric pump 3 and the opening of the electric valve 1 is adjusted to meet the requirements of the test coolant (oil) flow rate. At the same time, the temperature of the ambient temperature chamber 11 is adjusted to meet the requirements of the test coolant (oil) inlet temperature.

[0046] 3. When the coolant (oil) temperature reaches the set requirement value, open the manual valve 2 of the corresponding microchannel radiator inlet pressure test pipeline and microchannel radiator outlet pressure test pipeline, and monitor the flow resistance value of the microchannel radiator 12 under the set temperature and set flow rate. Figure 1 The microchannel heatsink 12 under test has one hot-side inlet, one hot-side outlet, two cold-side inlets, and two cold-side outlets, for a total of six interface nozzles. Figure 1 The letter H represents the inlet of the cold and hot sides, and the letter L represents the outlet of the cold and hot sides. The hot side inlet and outlet correspond to each other, and the cold side inlet and outlet are paired and correspond one-to-one. Therefore, three secondary microchannel radiator inlet media lines, three microchannel radiator outlet media lines, three microchannel radiator inlet pressure test lines, and three microchannel radiator outlet pressure test lines are set up. One hot side (or cold side) inlet, one hot side (or cold side) outlet, one secondary microchannel radiator inlet media line, one microchannel radiator outlet media line, one microchannel radiator inlet pressure test line, and one microchannel radiator outlet pressure test line constitute one test loop, for a total of three different test loops, used to test the flow resistance of three different flow rates of coolant. When one test loop is open, the other two loops are closed. The three test loops share the electric pump 3, the liquid storage tank 10, the temperature environment chamber 11, the check valve 6, and the filter 4.

[0047] The above embodiments are not intended to limit the scope of protection of the present invention. Any modifications, alterations or equivalent substitutions made based on the technical solutions of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A microchannel heat sink low temperature flow resistance test apparatus, characterized by: The environmental temperature box (11) is provided with a liquid storage tank (10) and a micro-channel radiator (12) to be tested, wherein, The outlet end of the liquid storage tank (10) is connected with the inlet of the micro-channel radiator (12) to be tested through a micro-channel radiator inlet end medium pipeline, and a manual valve (2), an electric pump (3), a one-way valve (6), a temperature sensor (7) and an electric valve (1) are sequentially arranged on the micro-channel radiator inlet end medium pipeline, and the temperature sensor (7) and the electric valve (1) are located outside the environmental temperature box (11), and the manual valve (2), the electric pump (3) and the one-way valve (6) are located inside the environmental temperature box (11); The inlet end of the liquid storage tank (10) is connected with the outlet of the micro-channel radiator (12) to be tested through a micro-channel radiator outlet end medium pipeline, and a filter (4) is arranged on the micro-channel radiator outlet end medium pipeline; The liquid storage tank (10) is provided with a partition plate for prolonging the flow distance of the cooling liquid, prolonging the heat exchange time and increasing the surface area of the cooling liquid, and the inlet end and the outlet end of the liquid storage tank (10) are located on the two sides of the partition plate, respectively; One end of the micro-channel radiator inlet end pressure test pipeline is connected with the micro-channel radiator inlet end medium pipeline, and the connection is located inside the environmental temperature box (11), and the other end is connected with the first end of a differential pressure transmitter (9) through a manual valve (2), and the manual valve (2) and the differential pressure transmitter (9) are located outside the environmental temperature box (11); One end of the micro-channel radiator outlet end pressure test pipeline is connected with the micro-channel radiator outlet end medium pipeline, and the connection is located inside the environmental temperature box (11), and the other end is connected with the second end of the differential pressure transmitter (9) through a manual valve (2), and the manual valve (2) and the differential pressure transmitter (9) are located outside the environmental temperature box (11); The first end of the differential pressure transmitter (9) is also connected with a pressure transmitter (8), and the pressure transmitter (8) is located outside the environmental temperature box (11); The micro-channel radiator inlet end medium pipeline is split into multiple secondary micro-channel radiator inlet end medium pipelines at the outlet end of the one-way valve (6), each secondary micro-channel radiator inlet end medium pipeline comprises an electric valve (1), the electric valve (1) is located outside the environmental temperature box (11), and each secondary micro-channel radiator inlet end medium pipeline is connected with an inlet of the micro-channel radiator (12) to be tested; The micro-channel radiator outlet end medium pipeline is split into multiple secondary micro-channel radiator outlet end medium pipelines at the inlet end of the filter (4), and each secondary micro-channel radiator outlet end medium pipeline is connected with an outlet of the micro-channel radiator (12) to be tested. Each secondary micro-channel radiator inlet end medium pipeline corresponds to one micro-channel radiator inlet end pressure test pipeline, and each secondary micro-channel radiator outlet end medium pipeline corresponds to one micro-channel radiator outlet end pressure test pipeline. The plurality of micro-channel radiator inlet end pressure test pipelines are simultaneously connected with the first end of the differential pressure transmitter (9), and the plurality of micro-channel radiator outlet end pressure test pipelines are simultaneously connected with the second end of the differential pressure transmitter (9).

2. The microchannel heat sink cryogenic flow resistance test device of claim 1, wherein: The micro-channel radiator inlet end medium pipeline further comprises a stainless steel hose (5), and the electric valve (1) is connected with the inlet of the micro-channel radiator (12) to be tested through the stainless steel hose (5).

3. The microchannel heat sink cryogenic flow resistance test device of claim 1, wherein: The ambient temperature box (11), the electric pump (3), the electric valve (1), the temperature sensor (7), the pressure transmitter (8) and the differential pressure transmitter (9) are electrically connected with the computer.

Images