A working method, system and device for a helium compressor test bench

Abstract

The present invention discloses a helium compressor test bench, belonging to the technical field of helium compressor test benches, and specifically relates to a working method, system and device of a helium compressor test bench. In the present invention, the entire unit under test (helium compressor assembly) is placed in a low-temperature and low-pressure test box, and the box reaches the required test temperature by a refrigeration module. The box is first evacuated, then helium is injected, and then the vacuum is finely adjusted to the target pressure. The unit under test completes the cycle in the test box. The compressor outlet pipeline is connected to an external heat exchanger for heat exchange. The gas enters the machine and is discharged from the base under the machine, and then enters an independent heat exchanger through a pipeline to cool the gas heated due to compression to the temperature required by the test environment, and then is discharged into the main test chamber to ensure that the discharged gas does not disturb the environment in the environmental test box. A high-precision helium concentration tester is arranged in the box to detect the leakage situation.

Description

Technical Field

[0001] The present invention discloses a helium compressor test bench, belonging to the technical field of helium compressor test benches, and specifically relates to a working method, system and device of a helium compressor test bench. Background Art

[0002] The test bench is applied to a helium compressor directly driven by a high-speed motor. The characteristics of the helium compressor itself include: being applied to an aircraft, needing to adapt to changing ambient air pressure and temperature; being miniaturized and lightweight; having a high degree of integration; being modular and easy to replace. Its working medium is helium, and the working temperature range is from minus 100 degrees Celsius to plus 200 degrees Celsius.

[0003] The test system needs to simulate the low-temperature environment at the flight altitude of the aircraft and evaluate whether the prototype life meets the design requirements.

[0004] One of the difficulties of the helium compressor test system lies in the creation of a rare gas helium environment. Existing technical solutions mostly build the test system in the form of pipelines, and the compressor is one link in the pipeline. Other components such as a refrigeration compressor and a vacuum pump are also included in the pipeline to achieve a low-temperature environment. Its most main problem is that the overly long pipeline results in extremely high pipeline leak prevention costs and cannot completely prevent leakage (outside air enters and dilutes the helium), and currently this solution cannot fully achieve the required functions. At the same time, the following problems exist:

[0005] 1. The pipeline system needs to arrange a sensor system at each pipeline unit to detect the temperature, pressure and helium concentration in the pipeline, resulting in too high manufacturing costs and a large amount of data acquisition;

[0006] 2. At the same time, the pipeline system requires a large number of flange plates and seals, resulting in many interfaces and increasing the leakage risk (preventing outside air from entering the test environment and diluting the helium concentration);

[0007] 3. It is difficult for the pipeline system to be used to test the helium compressor cycle, and creating a circulating environment is likely to disturb the simulated working conditions. The total amount of gas in the pipeline is small, and the compressed high-temperature and high-pressure helium gas is likely to cause disturbances to the pressure and temperature of the test environment during the circulation process in the system, reducing the stability of the environmental simulation and the performance of the test system. Summary of the Invention

[0008] Object of the Invention: To provide a working method, system and device of a helium compressor test bench to solve the above-mentioned problems.

[0009] Technical Solution: In the first aspect, a working method of a helium compressor test bench is provided, including the following steps:

[0010] Step 1: Place the entire unit under test, i.e., the helium compressor, into a low-temperature and low-pressure test chamber;

[0011] Step 2: Cool down the inside of the test chamber under low temperature and low pressure to create a low-temperature environment at the flight altitude of the aircraft inside it.

[0012] Step 3: When the set temperature is reached inside the test chamber, the cooling process ends. Then, pump out the air inside the test chamber and supplement helium gas into the test chamber to achieve the required vacuum degree and helium concentration.

[0013] Step 4: When the required vacuum degree and helium concentration are reached inside the test chamber, the helium compressor operates to inhale helium gas into the compressor and discharge it through the base under the compressor. The discharged gas enters an independent heat exchanger through the gas guide box. The gas heated due to compression is cooled to the temperature of the test environment and then discharged back into the test chamber.

[0014] Step 5: Repeat Step 4 until the test ends.

[0015] In a further embodiment, in Step 3, before the helium compressor test starts, the test chamber starts to cool down through Step 2. After reaching the set temperature, the cooling process ends. Subsequently, start the vacuum pumping operation on the inside of the test chamber, pump the inside of the test chamber to a level lower than the test vacuum degree threshold, and then fill it with helium gas. Repeat the vacuum pumping and helium gas supplement operations until the required vacuum degree and helium concentration are achieved in the test environment, and then it is completed.

[0016] In a further embodiment, during the test, a high-precision helium concentration tester inside the test chamber will detect the leakage situation in real time.

[0017] In a second aspect, a helium compressor test bench device is provided, including:

[0018] A test chamber, fixedly installed in the working area, with a test cavity formed inside the test chamber; a cooler, fixedly installed on the test chamber; a gas guide box, installed in the test cavity of the test chamber; a compressor, arranged in the test cavity of the test chamber and installed on the gas guide box; a power supply and sensor control module, fixedly installed on one side of the test chamber body and connected to the test cavity.

[0019] The test chamber has a helium gas supplement port and a high-vacuum extraction port. A helium gas supplement pipe is fixedly connected to the helium gas supplement port, and a high-vacuum extraction pipe is fixedly connected to the high-vacuum extraction port.

[0020] In a further embodiment, the cooler has a cooling air inlet and a cooling air outlet connected to the test cavity of the test chamber.

[0021] A cooling air inlet pipe is provided at the cooling air inlet. One end of the cooling air inlet pipe passes through the test chamber body and is connected to the cooler, and the other end is connected to the gas guide box.

[0022] A cooling exhaust pipe is provided on the cooling exhaust port. One end of the cooling exhaust pipe passes through the test box body and is connected to the cooler, and the other end is connected to the inside of the test cavity.

[0023] In a further embodiment, an intake pipe inside the box is provided on the intake port of the compressor.

[0024] In a further embodiment, an air exchange box is provided between the air guide box and the compressor. The top of the air exchange box is connected to the outlet of the compressor, and the bottom is connected to the top intake port of the air guide box.

[0025] In a further embodiment, the input end of the helium replenishment pipe is externally connected to a helium replenishment device, and the input end of the high-vacuum extraction pipe is externally connected to a vacuum extraction device.

[0026] In a further embodiment, the outlet pipeline at the bottom of the air guide box is externally connected to a heat exchanger device.

[0027] In a third aspect, a helium compressor test bench system is provided, including:

[0028] A test unit, which consists of a detection module, a refrigeration module, a heat exchange module, a gas extraction and helium replenishment module, and a sensing module;

[0029] A unit under test, which consists of a helium compressor, and realizes the low-temperature environment test of the helium compressor through the test unit;

[0030] A control unit, which controls the test unit to complete the test work on the unit under test.

[0031] Beneficial effects: In the present invention, the entire unit under test (helium compressor assembly) is placed in a low-temperature and low-pressure test box body. The box body reaches the required test temperature by the refrigeration module. The box body is first evacuated, then helium is injected, and then the vacuum is finely adjusted to the target pressure. The unit under test completes the cycle in the test box body. The outlet pipeline of the compressor exchanges heat with an external heat exchanger. The gas enters the machine and is discharged from the base inside the machine. Then, it passes through a pipeline and enters an independent heat exchanger to cool the gas heated due to compression to the temperature of the test environment, and then is discharged into the main test chamber to ensure that the discharged gas does not disturb the environment in the environmental test box. A high-precision helium concentration tester is arranged inside the box body to detect the leakage situation.

[0032] Therefore, the present invention has the following advantages:

[0033] 1. The number of temperature, pressure, and helium concentration sensors inside the entire test device is reduced, the cost is reduced, and the problem in the prior art that a sensor system needs to be arranged for each pipeline unit in the pipeline system is solved;

[0034] 2. Reduces the leakage risk and lowers the sealing requirements. Since a large number of flanges and seals are required in the pipeline system of the prior art, many interfaces are created, increasing the leakage risk. From past experience, pipeline system leakage is indeed the biggest problem;

[0035] 3. By exhausting, heating, and reintroducing the gas, it solves the difficulty of using the pipeline system to test the helium compressor cycle and the problem that creating a circulating environment easily disturbs the simulated working conditions.

[0036] 4. In order to maintain the temperature and pressure stability in the main test chamber, the testing system innovatively designs an independent heat exchanger for the heated gas discharged from the compressor outlet. Description of the Drawings

[0037] Figure 1 is the working flow chart of the present invention.

[0038] Figure 2 is the schematic diagram of the method of the present invention.

[0039] Figure 3 is the isometric view of the device of the present invention.

[0040] Figure 4 is the rear view of the device of the present invention.

[0041] Figure 5 is the schematic diagram of the compressor of the device of the present invention.

[0042] Reference numerals: test chamber 1, test cavity 2, cooler 3, gas guide box 4, compressor 5, power supply and sensor control module 6, helium replenishment pipeline 7, high vacuum extraction pipeline 8, cooling intake pipeline 9, cooling exhaust pipeline 10, air exchange box 11, in-box intake pipeline 12. Detailed Embodiments

[0043] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings. Apparently, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0044] Embodiment 1:

[0045] As Figure 1 and Figure 2 shown, a working method for a helium compressor test bench includes the following steps:

[0046] Step 1, Place the entire unit under test, i.e., the helium compressor, into the low-temperature and low-pressure test chamber;

[0047] Step 2: Cool down the inside of the low-temperature and low-pressure test chamber to create a low-temperature environment at the flight altitude of the aircraft.

[0048] Step 3: After the temperature reduction process ends when the set temperature is reached inside the test chamber, pump out the air inside the test chamber in a cycle and replenish helium gas into the test chamber to achieve the required vacuum degree and helium concentration.

[0049] Step 4: When the required vacuum degree and helium concentration are reached inside the test chamber, the helium compressor operates to inhale helium gas into the compressor and discharge it through the base under the compressor. The discharged gas enters an independent heat exchanger through a gas guide box. The gas heated due to compression is cooled to the temperature of the test environment and then discharged back into the test chamber.

[0050] Step 5: Repeat Step 4 until the test ends.

[0051] In one embodiment, in Step 3, before the helium compressor test starts, the test chamber starts to cool down through Step 2. After the set temperature is reached, the temperature reduction process ends. Subsequently, the test chamber starts to be evacuated, pumped to a pressure lower than the test vacuum degree threshold, and then helium gas is filled. Repeat the operations of evacuating and replenishing helium gas until the required vacuum degree and helium concentration are achieved in the test environment, and then it is completed.

[0052] In one embodiment, during the test, a high-precision helium concentration tester inside the test chamber will detect the leakage situation in real time.

[0053] In the above steps, the whole unit under test (helium compressor assembly) is placed in a low-temperature and low-pressure test chamber. The chamber is cooled to the required test temperature. First, the chamber is evacuated, then helium gas is injected, and then it is slightly evacuated to the target pressure. The unit under test completes the cycle in the test chamber. The outlet pipeline of the compressor exchanges heat with an external heat exchanger to ensure that the discharged gas does not disturb the environment in the test chamber. A high-precision helium concentration tester is set inside the chamber to detect the leakage situation.

[0054] The applicant will give an example below:

[0055] The cycle process is as follows:

[0056] Before the test starts, the main test chamber starts to cool down. After the set temperature is reached, the temperature reduction process ends. Then it starts to be evacuated to a pressure lower than the test vacuum degree (for example, if the absolute pressure of the test vacuum degree is 5 kPa, it is pumped to a pressure lower than 5 kPa), and then helium gas is filled. Repeat the operations of evacuating and replenishing helium gas until the required vacuum degree and helium concentration are achieved in the test environment.

[0057] The inlet of the helium compressor is inside the main test chamber. The helium is sucked into the machine and discharged into the base under the machine. Then, it enters an independent heat exchanger through a pipeline to cool the gas heated up due to compression to the temperature of the test environment, and then is discharged back into the main test chamber.

[0058] Embodiment 2:

[0059] As Figures 3 to 5 , a helium compressor test bench device, comprising:

[0060] A test chamber 1, fixedly installed in the working area. A test cavity 2 is formed inside the test chamber 1. A cooler 3 is fixedly installed on the body of the test chamber 1. An air guide box 4 is installed in the test cavity 2 of the test chamber 1. A compressor 5 is arranged in the test cavity 2 of the test chamber 1 and installed on the air guide box 4. A power supply and sensor control module 6 is fixedly installed on one side of the body of the test chamber 1 and connected to the inside of the test cavity 2;

[0061] In one embodiment, as Figures 3 to 5 shown, a helium gas replenishment port and a high vacuum extraction port are opened on the test chamber 1. A fixedly connected helium gas replenishment pipeline 7 is provided on the helium gas replenishment port, and a fixedly connected high vacuum extraction pipeline 8 is provided on the high vacuum extraction port.

[0062] In one embodiment, as Figures 3 to 5 shown, the cooler 3 is provided with a cooling air inlet and a cooling air outlet connected to the inside of the test cavity 2 of the test chamber 1;

[0063] A cooling air inlet pipeline 9 is provided on the cooling air inlet. One end of the cooling air inlet pipeline 9 passes through the body of the test chamber 1 and is connected to the cooler 3, and the other end is connected to the air guide box 4;

[0064] A cooling air outlet pipeline 10 is provided on the cooling air outlet. One end of the cooling air outlet pipeline 10 passes through the body of the test chamber 1 and is connected to the cooler 3, and the other end is connected to the inside of the test cavity 2 body.

[0065] In one embodiment, as Figures 3 to 5 shown, an in-chamber air inlet pipeline 12 is provided on the air inlet of the compressor 5.

[0066] In one embodiment, as Figures 3 to 5 shown, an air exchange box 11 is provided between the air guide box 4 and the compressor 5. The top of the air exchange box 11 is connected to the air outlet of the compressor 5, and the bottom is connected to the top air inlet of the air guide box 4.

[0067] In one embodiment, as Figures 3 to 5As shown, the input end of the helium supplement pipeline 7 is externally connected to a helium supplement device, and the input end of the high-vacuum extraction pipeline 8 is externally connected to a vacuum extraction device.

[0068] In one embodiment, as Figures 3 to 5 shown, the outlet pipeline at the bottom of the air guide box 4 is externally connected to a heat exchanger device.

[0069] Embodiment 3:

[0070] A helium compressor test bench system includes:

[0071] A test unit, which consists of a detection module, a refrigeration module, a heat exchange module, an air extraction and helium supplement module, and a sensing module;

[0072] A tested unit, which consists of a helium compressor, and realizes the low-temperature environment test of the helium compressor through the test unit;

[0073] A control unit, which controls the test unit to complete the test work on the tested unit.

[0074] Working principle: When the present invention works, the compressor 5 and the air guide box 4 are placed in the test box 1 body, so that the test box 1 starts to refrigerate, and then reaches the required test temperature. Secondly, helium is injected into the test box 1 through an external helium injection device. The helium enters the test box 1 through the helium supplement pipeline 7, and then the air inside the test box 1 is extracted through an external vacuum extraction device. The air inside the test box 1 is extracted through the high-vacuum extraction pipeline 8, so that the air inside the test box 1 reaches the target pressure. The compressor 5 circulates in the test box 1 body to complete the test. The outlet pipeline at the bottom of the air guide box 4 is externally connected to a heat exchanger device for heat exchange to ensure that the discharged gas does not disturb the environment in the test box 1. A high-precision helium concentration tester is arranged inside the box body to detect the leakage situation.

[0075] Obviously, the above embodiments are only examples clearly described, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A helium compressor test bench operating method, characterized in that: include: Helium compressor test bench device, which includes: A test box is fixedly installed in the working area, and a test cavity is formed inside the test box. A cooler is fixedly installed on the test box. An air guide box is installed in the test cavity of the test box. A compressor is arranged in the test cavity of the test box and installed on the air guide box. A power supply and sensor control module is fixedly installed on one side of the test box body and connected to the test cavity. The test box is provided with a helium supply port and a high vacuum extraction port, the helium supply port is provided with a fixedly connected helium supply pipeline, and the high vacuum extraction port is provided with a fixedly connected high vacuum extraction pipeline; The following steps are also included: Step 1: Place the entire unit under test, i.e., the helium compressor, into a low-temperature and low-pressure test chamber; Step 2: Cool the interior of the low-temperature and low-pressure test chamber to a low-temperature environment at the aircraft's flight altitude. Step 3: When the test chamber reaches the set temperature, the cooling process ends, and the air in the test chamber is circulated out and helium is added to the test chamber to achieve the required vacuum degree and helium concentration; Step 4: When the required vacuum and helium concentration are reached in the test chamber, the helium compressor starts working and draws helium into the compressor. The helium is then discharged through the base below the compressor. The exhaust gas then passes through the air guide box and enters an independent heat exchanger. The heated gas is cooled to the test environment temperature after compression and then discharged into the test chamber. Step 5. Repeat step 4 until the test is completed; In step 3, before the helium compressor test begins, the test chamber begins cooling and cooling according to step 2. The cooling process ends when the set temperature is reached. Then, the test chamber is evacuated to a vacuum level below the test vacuum threshold, and then filled with helium. The evacuation and helium replenishment operations are repeated until the test environment reaches the required vacuum level and helium concentration. During the test, the high-precision helium concentration tester in the test box will detect leaks in real time.

2. A helium compressor test bench operating method according to claim 1, characterized in that: The cooler is provided with a cooling air inlet and a cooling air outlet connected to the test cavity of the test box; The cooling air inlet is provided with a cooling air inlet pipe, one end of the cooling air inlet pipe passes through the test box and is connected to the cooler, and the other end is connected to the air guide box; A cooling exhaust pipe is provided on the cooling exhaust port. One end of the cooling exhaust pipe passes through the test box and is connected to the cooler, and the other end of the cooling exhaust pipe is connected to the inside of the test box.

3. The operating method of a helium compressor test bench according to claim 1, characterized in that: An air intake pipe in the box is provided on the air intake port of the compressor.

4. The operating method of a helium compressor test bench according to claim 1, characterized in that: An air exchange box is provided between the air guide box and the compressor. The top of the air exchange box is connected to the air outlet of the compressor, and the bottom is connected to the top air inlet of the air guide box.

5. The operating method of a helium compressor test bench according to claim 1, characterized in that: The input end of the helium replenishment pipeline is externally connected to a helium replenishment device, and the input end of the high vacuum extraction pipeline is externally connected to a vacuum extraction device.

6. The operating method of a helium compressor test bench according to claim 1, characterized in that: The outlet pipeline at the bottom of the air guide box is externally connected to a heat exchanger device.

7. A helium compressor test bench system, used to implement the helium compressor test bench operating method according to claim 1, characterized in that: include: The test unit consists of a detection module, a refrigeration module, a heat exchange module, an air extraction and helium replenishment module, and a sensor module; The unit under test is composed of a helium compressor, and the low-temperature environment test of the helium compressor is realized through the test unit; The control unit controls the test unit to complete the test work on the unit under test.

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