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CN-119779421-B - In-situ measurement device and measurement method for flow of throttle of pneumatic transmission system

CN119779421BCN 119779421 BCN119779421 BCN 119779421BCN-119779421-B

Abstract

An in-situ measurement device and a measurement method for the flow of a throttle of a pneumatic transmission system are disclosed, which are an indirect measurement type flow measurement device and a measurement method, and comprise a high-pressure small gas cylinder, a one-way valve, an electromagnetic switch, a pressure relief valve, a timer and a battery pack. The pressure gauge, the pressure relief valve and the one-way valve are respectively connected with the high-pressure small gas cylinder, one end of the electromagnetic switch gas circuit is connected with the one-way valve, the other end of the electromagnetic switch gas circuit is connected with the gas inlet interface, and the circuit of the electromagnetic switch is respectively connected with the timer and the battery pack. The invention can realize the measurement of the total flow rate flowing through the restrictor in unit time, thereby reflecting the restrictor throttling effect in the instantaneous flow rate or variable flow rate control process, solving the problem that the direct measurement type flowmeter is inconvenient to measure the instantaneous flow rate and variable flow rate process, being capable of measuring the instantaneous flow rate control process or the variable flow rate control process, and reflecting whether the flow rate of the restrictor deviates from the normal state or not.

Inventors

  • ZHANG TENG
  • LI ZHE
  • FENG YU
  • WANG ZHUOJIAN
  • CUI RONGHONG
  • HE YUTING

Assignees

  • 中国人民解放军空军工程大学

Dates

Publication Date
20260508
Application Date
20241121

Claims (6)

  1. 1. The in-situ measurement device for the flow of the throttle of the pneumatic transmission system is characterized by comprising a high-pressure small gas cylinder (5), a one-way valve (3), an electromagnetic switch (2), a pressure relief valve (6), a timer (7) and a battery pack (8), wherein the pressure gauge (4), the pressure relief valve and the one-way valve are respectively connected with the high-pressure small gas cylinder, one end of a gas circuit of the electromagnetic switch is connected with the one-way valve, the other end of the gas circuit of the electromagnetic switch is connected with an air inlet interface (1), and a circuit of the electromagnetic switch is respectively connected with the timer and the battery pack.
  2. 2. A method for measuring the flow rate of a restrictor of a parachute air conditioning system of an aircraft by using the in-situ measurement device of claim 1, which comprises the following steps: Step 1, disconnecting a joint at a test point of the drogue: Disconnecting the joint at the test point (15) in front of the umbrella hook actuator cylinder (16); Step 2, connecting a testing device: Step 3, testing a pressure release valve: step 4, cold air filling of the airplane: the cold air system on the airplane is filled with cold air to 120kgf/cm 2 , so that the air in the pipeline circulates, and further the measurement of the air flow is implemented; in the passage mode, the gas entering from the gas inlet interface (1) sequentially passes through an electromagnetic switch and a one-way valve and enters into a high-pressure small gas cylinder; step 6, measuring the change of the gas flow of the pipeline: Opening an aircraft main electric door, and poking an umbrella placing switch on the aircraft to measure the change of the gas flow in the pipeline in the umbrella placing process; Step 7, obtaining the change of the gas flow in the pipeline: The pressure value displayed by the pressure gauge changes the gas flow in the pipeline; step 8, recovering an aircraft air inlet interface: Sequentially closing an aircraft electric door and a timer (7), detaching the air inlet interface in the step2 from the test point (15), and separating a pipeline from the test point to detach the measuring device; And (3) restoring the disconnected joint at the test point in front of the umbrella hook actuator cylinder, namely reconnecting the disconnected pipelines together to finish the measurement.
  3. 3. A method of measuring the flow of air through a restrictor of a drag parachute air conditioning system of an aircraft as claimed in claim 2, wherein the air flow time in the drag parachute portion of the air conditioning line is 1 second.
  4. 4. A method for measuring the flow of air in a restrictor of a drogue parachute system for an aircraft according to claim 2, characterized in that the connection testing means is a means for connecting the air inlet port (1) of the in-situ measuring means to the line at the disconnected test point (15) so that the two are in communication and the air can circulate in both means.
  5. 5. A method for measuring the flow rate of a restrictor of a drag parachute air conditioning system of an aircraft according to claim 2, characterized by adjusting the relief valve, unscrewing the knob of the relief valve to make the pressure in the high-pressure small air cylinder coincide with the atmospheric pressure, then screwing the knob to make the relief valve in a closed state, and the high-pressure small air cylinder (5) is not communicated with the atmosphere any more, wherein the change of the air pressure in the high-pressure small air cylinder is the change of the air pressure in the measuring device.
  6. 6. The method for measuring the flow rate of the air conditioner of the air-conditioning system of the airplane drag parachute according to claim 2 is characterized in that the air of the pipeline enters the measuring device at a test point (15) through the air inlet connector, the air sequentially passes through the electromagnetic switch (2) and the one-way valve (3) and enters the high-pressure small air cylinder (5), the pressure in the high-pressure small air cylinder can be changed after the air enters the high-pressure small air cylinder, and the pressure of the air in the high-pressure small air cylinder, namely the air pressure in the pipeline, is obtained through the pressure gauge (4) in the high-pressure small air cylinder.

Description

In-situ measurement device and measurement method for flow of throttle of pneumatic transmission system Technical Field The invention relates to the technical field of mechanical engineering, in particular to an in-situ measurement device and a measurement method for the flow of a throttle of a pneumatic transmission system. Background In the pneumatic transmission system, the throttle of the compressed gas flow is generally realized through a throttle, so that the control of the movement speed of an executing element, the delay time of a delay element and the like in the pneumatic transmission system is realized. In general, pneumatic drive systems have a clear requirement for the throttle volume of the throttle. If the throttling element in the throttling device is worn, jammed or blocked, the throttling amount of the throttling device is changed, so that the gas inlet amount of a subsequent executing element or a delay element is influenced, the control plan of the whole pneumatic transmission system is changed, and faults or accidents are caused. Therefore, in the service stage of the pneumatic transmission system, the flow rate of the throttler needs to be detected regularly, so that accidents are prevented. Particularly, in the active equipment, the working condition of the whole system is usually detected by matching with other accessories in the pneumatic transmission system, and an in-situ detection mode is needed. At present, common devices for measuring gas flow mainly include orifice plate flow meters, electromagnetic flow meters, turbine flow meters, venturi flow meters, volumetric flow meters, rotameters, vortex shedding flow meters, roots flow meters, ultrasonic flow meters, nozzle flow meters, etc., and the measurement principles of these flow measurement devices are different, but they can be generally classified as direct measurement flow meters. For these flow measuring devices, the gas circuit is connected in during operation, and the advantage is that the stable flow value in the gas circuit can be directly measured during measurement, and the flow measuring device is direct and convenient, and can also check the working condition of the system during flow measurement. However, they have disadvantages in that 1, for the instantaneous flow control process, the gas flow time is short (e.g., several milliseconds to several tens milliseconds), the flow value recording function is required to be implemented, and it is difficult to implement, and 2, for the variable flow control process, sometimes the average flow value of the whole process is required to be measured, and the whole flow measurement process is required to be integrated, and it is difficult to implement. Disclosure of Invention In order to overcome the defect that the recording of the instantaneous flow value and the measurement of the average flow value in the whole process are difficult to realize in the prior art, the invention provides an in-situ measurement device and a measurement method for the flow of a throttle of a pneumatic transmission system. The invention provides an in-situ measurement device for the flow of a throttle of a pneumatic transmission system, which comprises a high-pressure small gas cylinder, a one-way valve, an electromagnetic switch, a pressure relief valve, a timer and a battery pack. The pressure gauge, the pressure relief valve and the one-way valve are respectively connected with the high-pressure small gas cylinder, one end of the electromagnetic switch gas circuit is connected with the one-way valve, the other end of the electromagnetic switch gas circuit is connected with the gas inlet interface, and the circuit of the electromagnetic switch is respectively connected with the timer and the battery pack. In the cool air pipeline of the speed reducing umbrella part, the circulation time of the cool air is 1 second. The specific process for measuring the flow rate of the restrictor of the air conditioning system of the parachute of the certain aircraft by using the in-situ measuring device provided by the invention is as follows: Step 1, disconnecting a joint at a test point of the drogue: And disconnecting the joint at the test point in front of the umbrella hook actuator cylinder. Step 2, connecting a testing device: the connection testing device is used for connecting an air inlet interface in the in-situ measuring device with a pipeline at the disconnected test point, so that the air inlet interface and the pipeline are communicated, and gas can circulate in the two devices. Step 3, testing a pressure release valve: the pressure release valve is adjusted, the knob of the pressure release valve is unscrewed to enable the pressure in the high-pressure small gas cylinder to be consistent with the atmospheric pressure, then the knob is screwed to enable the pressure release valve to be in a closed state, the high-pressure small gas cylinder is not communicated with the atmosphere any more, and