High-altitude air exhaust simulation system and control method thereof

Abstract

The invention provides a high-altitude air extraction simulation system and a control method thereof. The system comprises a test chamber, an air extraction pipeline, an air extraction adjusting valve group, an air supply adjusting valve group, an air supply pipeline, an air extraction pump group, a pressure sensor and a remote controller. According to the invention, preparation before air extraction, air extraction and the final maintenance process of the pressure in the cabin are realized, and the combined control method of the air extraction regulating valve group and the air supply regulating valve group is suitable for the change of the pressure in the cabin meeting the requirements, so that the reproduction of the change process from a certain altitude value to another altitude value in the cabin meeting the requirements can be realized.

Description

Technical Field

[0001] The invention belongs to the field of test equipment, and in particular relates to a high-altitude simulated air extraction system and a control method thereof. Background Art

[0002] The altitude simulation system is a test device used to simulate high-altitude environments. It can test the performance and adaptability of materials, devices, equipment, organisms, etc. in high-altitude environments. In order to simulate the entire process of takeoff-cruise-landing or aerial maneuvers of aircraft or airborne equipment such as aircraft, the pressure in the test chamber of the altitude simulation system needs to change at a set rate of change, so as to more realistically simulate or reproduce the altitude environment of the aircraft or airborne equipment. Summary of the invention

[0003] The present invention provides a high altitude simulated air extraction system and a control method thereof. The system comprises: a test chamber, an air extraction pipeline, an air extraction regulating valve group, an air supply pipeline, an air supply regulating valve group, an air extraction pump group, a pressure sensor and a remote controller.

[0004] The test chamber is a hollow sealed chamber used for placing test pieces.

[0005] The air extraction pipeline is used to realize the connection between the test chamber, the air extraction regulating valve group and the air extraction pump group.

[0006] The exhaust regulating valve group is composed of a large-diameter exhaust regulating valve, a medium-diameter exhaust regulating valve and parallel pipelines. The specifications and quantity of the regulating valves in the exhaust regulating valve group can be matched according to the working conditions. According to actual needs, a small-diameter exhaust regulating valve can be set to be connected in parallel with the large-diameter exhaust regulating valve and the medium-diameter exhaust regulating valve. Inside the exhaust regulating valve group, the diameter ratio of the two regulating valves and pipelines with similar diameters should be between 2.0 and 3.0. The selection of the large-diameter exhaust regulating valve is based on the maximum controllable exhaust flow rate.

[0007] The air supply pipeline is used to achieve the connection between the atmospheric environment, the air supply regulating valve group and the air extraction pipeline.

[0008] The air supply regulating valve group is composed of a large-diameter air supply valve, a muffler, a filter and a pipeline. The specifications and quantity of the regulating valves in the air supply regulating valve group can be matched according to the working conditions. According to actual needs, a medium-diameter air supply regulating valve can be set in parallel with the large-diameter air supply valve. Furthermore, inside the air supply regulating valve group, the diameter ratio of the two regulating valves and pipelines with similar diameters should be between 2.0-3.0. Furthermore, the selection of the regulating valve inside the air supply regulating valve group is based on the minimum controllable air extraction flow rate.

[0009] The vacuum pump group is connected to the vacuum pipeline, and the vacuum pump group is the negative pressure source of the system. The vacuum pump group includes a main vacuum pump group and a maintenance pump group. Further, the main vacuum pump group can be realized by one or more vacuum pumps of various types according to the working conditions. Further, the maintenance pump group can be realized by one or more vacuum pumps of various types according to the working conditions, and the vacuuming capacity of the maintenance pump group is smaller than that of the main vacuum pump group.

[0010] The pressure sensor is installed on the test chamber and is used to measure the pressure in the test chamber.

[0011] The remote controller is connected with the air extraction regulating valve group, the air supply regulating valve group, the air extraction pump group and the pressure sensor through cables. The remote controller has a built-in air extraction system control method.

[0012] The present invention also provides a high-altitude simulated air extraction system control method, which includes the following steps: a pre-extraction preparation process, an air extraction process, and a final test chamber pressure maintenance process.

[0013] The pre-vacuum preparation process is a sequential start-up process of each vacuum pump in the main pump group;

[0014] The air extraction process is the process in which the system extracts air according to the set pressure change curve in the test chamber, including the control of the air extraction regulating valve group and the air supply regulating valve group; the air extraction process needs to solve the air extraction rate requirement according to the pressure change curve in the test chamber. When the air extraction rate requirement is greater than the threshold value a, only the air extraction regulating valve group is used to extract air from the test chamber.

[0015] Furthermore, the control method of the large-diameter exhaust regulating valve, the medium-diameter exhaust regulating valve, and the small-diameter exhaust regulating valve in the exhaust regulating valve group is as follows:

[0016] The pressure value in the test chamber is controlled in a closed loop by using a small-diameter exhaust regulating valve. The opening range of the small-diameter exhaust regulating valve is used as the control target to perform closed-loop control on the opening of the medium-diameter exhaust regulating valve. The opening range of the medium-diameter exhaust regulating valve is used as the control target to perform closed-loop control on the opening of the large-diameter exhaust regulating valve.

[0017] When the air extraction rate is required to be less than the threshold value a, the air extraction regulating valve group and the air supply regulating valve group are used together to evacuate the test chamber. The control method of the air extraction regulating valve group is consistent with the above. The selection basis for the use of the large-diameter air supply valve and the small-diameter air supply valve in the air supply regulating valve group is as follows:

[0018] When the air pumping rate requirement is less than the threshold value a1, open the large-diameter air supply valve and the small-diameter air supply valve; when the air pumping rate requirement is between a1 and a2, open the large-diameter air supply valve; when the air pumping rate requirement is between a2 and a, open the small-diameter air supply valve.

[0019] The maintenance process is to match the vacuum pump in the vacuum pump group and control the vacuum valve in the vacuum regulating valve group according to the leakage of the test chamber after reaching the pressure target in the test chamber. The maintenance process needs to be considered separately according to the final target value of the pressure in the test chamber. When the final target value of the pressure in the test chamber is greater than the threshold value b, the maintenance pump group is started and the main pump group is turned off. When the final target value of the pressure in the test chamber is less than the threshold value b, the maintenance pump group is not started, and one or more vacuum pumps of the main pump group are used to maintain the pressure in the test chamber.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention realizes the process of pre-evacuation preparation, evacuation and final cabin pressure maintenance;

[0022] 2. The combined control method of the air extraction regulating valve group and the air supply regulating valve group of the present invention is suitable for the required change process of the cabin pressure, so that the change process from a certain altitude value to another altitude value in the cabin can be reproduced as required; BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention:

[0024] Figure 1 It is a schematic diagram of the high altitude simulation extraction system;

[0025] Figure 2 It is a schematic diagram of the exhaust regulating valve group;

[0026] Figure 3 It is a schematic diagram of the air supply regulating valve group;

[0027] Figure 4 is a schematic diagram of an air extraction pump set;

[0028] Figure 5 It is the working flow chart of the high altitude simulation extraction system;

[0029] Figure 6 It is a closed-loop control method for the exhaust regulating valve group when there is no small-diameter exhaust regulating valve;

[0030] Figure 7 The invention relates to a closed-loop control method of an exhaust regulating valve group when there is an exhaust regulating valve with a small diameter.

[0031] Among them: 1-test cabin 2-exhaust pipeline 3-exhaust regulating valve group 4-air supply pipeline 5-air supply regulating valve group 6-exhaust pump group 7-pressure sensor 8-remote controller 31-large diameter exhaust regulating valve 32-medium diameter exhaust regulating valve 33-small diameter exhaust regulating valve 51-large diameter air supply valve 52-small diameter air supply valve 53-muffler 54-filter 61-main pump group 62-maintenance pump group DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] The present invention provides an altitude simulation air extraction system, such as Figure 1 As shown, the system consists of a test chamber 1, an air extraction pipeline 2, an air extraction regulating valve group 3, an air supply regulating valve group 5, an air supply pipeline 4, an air extraction pump group 6, a pressure sensor 7 and a remote controller 8.

[0034] The test chamber 1 is a hollow sealed chamber used for placing test pieces.

[0035] The air extraction pipeline 2 is used to realize the connection between the test chamber 1, the air extraction regulating valve group 3 and the air extraction pump group 6.

[0036] The exhaust regulating valve group 3 is composed of a large-diameter exhaust regulating valve 31, a medium-diameter exhaust regulating valve 32, a small-diameter exhaust regulating valve 33 and parallel pipelines. Figure 2 As shown. Among them, the small-diameter exhaust regulating valve can be set according to actual needs. Further, according to the pressure change curve inside the test chamber, the variation range of the exhaust rate is 1500-20000m 3 / h, the large-diameter exhaust regulating valve 31 and the supporting pipeline should be DN300, and the medium-diameter exhaust regulating valve 32 and the supporting pipeline should be DN100.

[0037] The air supply pipeline 4 is used to achieve the connection between the atmospheric environment, the air supply regulating valve group 5 and the air extraction pipeline 2.

[0038] The air supply regulating valve group 5 is composed of a large-diameter air supply valve 51, a medium-diameter air supply valve 52, a muffler 53, a filter 54 and a pipeline. Figure 3 As shown. Among them, the medium-diameter air supply valve can be set according to actual needs. Further, according to the minimum air extraction rate of 1500m 3 / h, the large-diameter air supply valve and supporting pipeline should be DN150.

[0039] The vacuum pump group 6 is connected to the vacuum pipeline 2. The vacuum pump group is the negative pressure source of the system. The vacuum pump group 6 includes a main vacuum pump group 61 and a maintenance pump group 62. Figure 4 As shown. Further, the main pumping group 61 can be realized by one or more vacuum pumps of various types according to the working conditions. Further, the maintenance pump group 62 can be realized by one or more vacuum pumps of various types according to the working conditions, and the suction capacity of the maintenance pump group 62 is smaller than that of the main pumping group 61.

[0040] The pressure sensor 7 is installed on the test chamber 1 and is used to measure the pressure in the test chamber 1 .

[0041] The remote controller 8 is connected to the air extraction regulating valve group 3, the air supply regulating valve group 5, the air extraction pump group 6, and the pressure sensor 7 through cables. Furthermore, the remote controller 8 has a built-in air extraction system control method.

[0042] The present invention also provides a control method for a high altitude simulated air extraction system. Figure 5 As shown, the steps are as follows: a pre-vacuum preparation process, a vacuum process and a final process of maintaining the pressure in the test chamber 1.

[0043] The pre-vacuuming preparation process is a process of sequentially starting each vacuum pump in the main pumping group 61 .

[0044] The air extraction process is a process in which the system extracts air according to a set pressure change curve in the test chamber 1, including the control of the air extraction regulating valve group 3 and the air supply regulating valve group 5.

[0045] The maintenance process is a process of matching the vacuum pump in the exhaust pump group 6 and controlling the exhaust valve in the exhaust regulating valve group 3 according to the leakage of the test chamber 1 after reaching the pressure target in the test chamber 1 .

[0046] Furthermore, the air extraction process needs to calculate the air extraction rate requirement according to the pressure change curve requirement in the test chamber 1.

[0047] The air extraction rate is required to be greater than the threshold value of 10000m 3 / h, only the exhaust regulating valve group 3 is used to exhaust the test chamber 1.

[0048] Furthermore, the control method of the large-diameter exhaust regulating valve 31 and the medium-diameter exhaust regulating valve 32 in the exhaust regulating valve group 3 is as follows: Figure 6 As shown: the pressure value in the test chamber 1 is closed-loop controlled by the medium-diameter exhaust regulating valve 32, and the opening range of the medium-diameter exhaust regulating valve 32 is used as the control target to perform closed-loop control on the opening of the large-diameter exhaust regulating valve 31. The opening target of the medium-diameter exhaust regulating valve is 30% to 70%.

[0049] Furthermore, the control method of the large-diameter exhaust regulating valve 31, the medium-diameter exhaust regulating valve 32, and the small-diameter exhaust regulating valve 33 in the exhaust regulating valve group 3 is as follows: Figure 7 As shown: the small-diameter exhaust regulating valve 33 is used to control the pressure value in the test chamber 1 in a closed loop, the opening range of the small-diameter exhaust regulating valve 33 is used as the control target, and the opening of the medium-diameter exhaust regulating valve 32 is closed-loop controlled, and the opening range of the medium-diameter exhaust regulating valve 32 is used as the control target, and the opening of the large-diameter exhaust regulating valve 31 is closed-loop controlled.

[0050] The air extraction rate is required to be less than the threshold value of 10000m 3 / h, the exhaust regulating valve group 3 and the air supply regulating valve group 5 are used together to exhaust the test chamber 1. The control method of the exhaust regulating valve group 3 is consistent with the above, and the control method of the large-diameter air supply valve 51 in the air supply regulating valve group 5 is as follows: the exhaust rate is required to be 1500m 3 / h and 10000m 3 / h, open the large-diameter air supply valve 51.

[0051] The maintenance process needs to be considered separately according to the final target value of the pressure in the test cabin 1. When the final target value of the pressure in the test cabin 1 is greater than the threshold value of 20kPa, the maintenance pump group 62 is started and the main pump group 61 is turned off. When the final target value of the pressure in the test cabin 1 is less than the threshold value of 20kPa, the maintenance pump group 62 is not started, and one or more vacuum pumps of the main pump group 61 are used to maintain the pressure in the test cabin 1.

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high altitude simulated air extraction system, characterized in that: include: A test chamber, an air extraction pipeline, an air extraction regulating valve group, an air supply pipeline, an air supply regulating valve group, an air extraction pump group, a pressure sensor and a remote controller; wherein the test chamber is a hollow sealed chamber for placing test pieces; The air extraction pipeline is used to realize the connection between the test chamber, the air extraction regulating valve group and the air extraction pump group; The exhaust regulating valve group is composed of a large-diameter exhaust regulating valve, a medium-diameter exhaust regulating valve and a parallel pipeline; The air supply pipeline is used to achieve the connection between the atmospheric environment, the air supply regulating valve group and the air extraction pipeline; The air supply regulating valve group is composed of a large-diameter air supply valve, a muffler, a filter and a pipeline; The vacuum pump group is connected to the vacuum pipeline and is the negative pressure source of the system. The vacuum pump group includes a main vacuum pump group and a maintenance pump group, and the main vacuum pump group and the maintenance pump group are connected in parallel; The pressure sensor is installed on the test chamber and is used to measure the pressure in the test chamber; The remote controller is connected with the air extraction regulating valve group, the air supply regulating valve group, the air extraction pump group and the pressure sensor.

2. A high altitude simulated air extraction system according to claim 1, characterized in that: The main pumping group and the maintenance pumping group are both realized by a combination of one or more vacuum pumps of various types, and the suction capacity of the maintenance pumping group is smaller than that of the main pumping group.

3. A high altitude simulated air extraction system according to claim 1, characterized in that: The selection of the large-diameter exhaust regulating valve is based on the maximum controllable exhaust flow rate, and the selection of the internal regulating valve of the air supply regulating valve group is based on the minimum controllable exhaust flow rate.

4. A high altitude simulated air extraction system according to claim 1, characterized in that: The exhaust regulating valve group also includes a small-diameter exhaust regulating valve, a large-diameter exhaust regulating valve, a medium-diameter exhaust regulating valve, and a small-diameter exhaust regulating valve in parallel, and the specifications and quantity of the regulating valves in the exhaust regulating valve group are matched according to the working conditions.

5. A high altitude simulated air extraction system according to claim 1, characterized in that: The air supply regulating valve group also includes a medium-diameter air supply valve. The large-diameter air supply valve is connected in parallel with the medium-diameter air supply valve. The specifications and quantity of the regulating valves in the air supply regulating valve group are matched according to the working conditions.

6. A high altitude simulated air extraction system according to claim 1, characterized in that: Inside the exhaust regulating valve group, the diameter ratio of two regulating valves and pipelines with similar diameters is 2.0~3.0; inside the air supply regulating valve group, the diameter ratio of two regulating valves and pipelines with similar diameters is 2.0~3.

0.

7. A control method for a high altitude simulated air extraction system according to claims 1-6, characterized in that: The process includes the following steps: the preparation process before the air pumping, the air pumping process and the process of maintaining the pressure in the final test chamber; The pre-vacuum preparation process is a sequential start-up process of each vacuum pump in the main pump group; The air extraction process is a process of extracting air according to a preset pressure change curve in the test chamber, including the control of the air extraction regulating valve group and the air supply regulating valve group; The maintenance process is a process of matching the vacuum pump in the exhaust pump group and controlling the exhaust valve in the exhaust regulating valve group according to the leakage situation of the test chamber after the pressure target in the test chamber is reached.

8. A control method for a high altitude simulated air extraction system according to claim 7, characterized in that: During the air extraction process, the air extraction rate requirement is calculated based on the pressure change curve in the test chamber.

9. A control method for a high altitude simulated air extraction system according to claim 8, characterized in that: When the exhaust rate requirement is greater than the threshold value a, only the exhaust regulating valve group is used to exhaust the test chamber; when the exhaust rate requirement is less than the threshold value a, the exhaust regulating valve group and the air supply regulating valve group are used jointly to exhaust the test chamber.

10. A control method for a high altitude simulated air extraction system according to claim 7, characterized in that: The maintenance process is considered based on the final target value of the pressure in the test chamber. When the final target value of the pressure in the test chamber is greater than the threshold value b, the maintenance pump group is started and the main pump group is turned off; when the final target value of the pressure in the test chamber is less than the threshold value b, the maintenance pump group is not started, and one or more vacuum pumps of the main pump group are used to maintain the pressure in the test chamber.

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