Device and method for high temperature aeronautical aerodynamic valve housing-piston friction force testing

Abstract

The application belongs to the field of tribology, and specifically discloses a device and method for testing the friction between a high-temperature aviation aerodynamic valve shell and a piston, which are used for simulating and testing the friction between a high-temperature aviation aerodynamic valve shell and a piston ring under different working conditions, and providing accurate friction data for the design and improvement of a high-temperature aviation aerodynamic valve. The device for testing the friction between a high-temperature aviation aerodynamic valve actuating device shell and a piston comprises an air valve piston cylinder, a tension and compression force sensor, a linear guide rail, a transmission mechanism and an electric push rod. The friction between a high-temperature aviation aerodynamic valve shell and a piston ring is tested by using the method and device in the design and simulation stage of a high-temperature aviation aerodynamic valve, so that the design of the high-temperature aviation aerodynamic valve can be improved accordingly, thereby improving the stability and safety of the high-temperature aviation aerodynamic valve, and further ensuring the flight safety of an airplane.

Description

TECHNICAL FIELD

[0001] The application discloses a kind of test method and device suitable for high-temperature aviation aerodynamic valve actuator shell-piston friction, belong to tribology application field. BACKGROUND

[0002] High-temperature aviation aerodynamic valve is the regulating device of aircraft gas source system, is used for aircraft gas source system, with system bleed air pressure regulating function, is one of key components to ensure aircraft flight safety, guarantee life safety.The automatic control of high-temperature aviation aerodynamic valve flap rotation angle is realized through the pressure difference of the two sides of piston, so that the bleed air valve outlet air pressure remains constant.The piston is high-temperature aviation aerodynamic valve, is actuating component, is also the key component for realizing self-feedback regulation.

[0003] The relative movement between high-temperature aviation aerodynamic valve piston and shell produces friction, which changes with the service time of high-temperature aviation aerodynamic valve, piston gas temperature, pressure, piston movement speed, seriously affects system pressure control accuracy and response characteristics, and affects the gas quality to downstream gas system.As a key factor affecting the self-feedback regulation accuracy of product, the coaxiality of piston and shell is high, and the conventional simple tension sensor measurement method cannot realize online assembly test, so it is necessary to establish a test method and device suitable for high-temperature aviation aerodynamic valve actuator shell-piston friction, which is helpful to evaluate the consistency and qualification of product, improve the stability of high-temperature aviation aerodynamic valve, and further ensure the flight safety of aircraft. SUMMARY

[0004] The main purpose of the present application is to provide a test method and device suitable for high-temperature aviation aerodynamic valve actuator shell-piston friction, to simulate and test the friction of high-temperature aviation aerodynamic valve shell-piston under different working conditions, and to provide accurate friction data for the design and improvement of high-temperature aviation aerodynamic valve.

[0005] Technical scheme: To achieve the above purpose, the present application provides a test device for high-temperature aviation aerodynamic valve shell-piston friction, which comprises: an aerodynamic valve piston cylinder, a tension and pressure sensor, a linear guide rail, a transmission mechanism and an electric push rod.

[0006] Among them, the shell-piston is two sets, symmetrically placed, to balance the air pressure on both sides, and the two sets of shell-piston are coaxially guided to avoid measurement error caused by different shafts; both sets of shell-piston are connected to high-temperature high-pressure gas source to simulate high-temperature high-pressure working state.

[0007] Any shell-piston comprises: a shell, a piston and a connecting rod; the shell and the piston are installed according to the service state; the connecting rod connects the two symmetrically placed pistons;

[0008] The transmission mechanism is arranged on the linear guide rail, and the transmission mechanism connects the pneumatic valve piston and the electric push rod;

[0009] The electric push rod is used for providing a push-pull force and driving the piston to move linearly.

[0010] The tension and pressure sensor is installed at a position where the transmission mechanism is connected with the air guide valve piston cylinder, and is used for testing the friction force when the piston ring of the test chamber moves.

[0011] Further, the transmission mechanism comprises four transmission rods arranged in a "mouth" shape, the middle part of the front and rear transmission rods has a rectangular through hole, and the middle part of the left and right transmission rods has no opening.

[0012] Further, the front side of the electric push rod has a boss II, and the boss II of the electric push rod is arranged at the middle position of the hole of the rear transmission rod.

[0013] Further, the middle part of the connecting rod of the shell-piston has a boss I, and the front side transmission rod of the transmission mechanism passes below the piston connecting rod, and the boss I of the piston connecting rod is arranged at the middle position of the hole of the front side transmission rod.

[0014] Further, the through hole of the rectangular through hole has a width of 20 mm and a length of 30 mm, the side of the rectangular through hole is perpendicular to the movement direction of the electric push rod and the piston, the boss contacts the side of the through hole, and the tension force is transmitted along the movement direction.

[0015] Further, the maximum movement range of the piston is 20 mm, and the speed range is 1 mm / s-20 mm / s.

[0016] Further, the height of the boss I and the boss II is 5 mm-10 mm.

[0017] In the test device designed in the application, the combination structure of the boss-rectangular through hole is used for transmitting the tension and pressure of the electric push rod and driving the piston to move. In the structure, the boss and the rectangular hole are not fixedly connected, but contact each other to apply a normal force. The structure can cleverly eliminate the additional bending moment caused by the misalignment of the assembly of the components of the test device. The double-shell-piston is oppositely arranged, and the coaxial characteristics of the product are used to guide the action, so that the measurement error is avoided.

[0018] The purpose of the application is to test the friction force of the shell-piston ring of the air guide valve piston. The application can test the friction force at different temperatures, gas pressures, piston movement speeds and service times.

[0019] Meanwhile, the application also provides a test method for the shell-piston friction of the high-temperature aviation aerodynamic valve actuating device, which adopts the test device described above, and when testing, the two piston cylinders are placed symmetrically, the connecting rod is placed in the middle to connect the two pistons, and then the cylinders are connected to the high-temperature and high-pressure gas source. The connecting rod, the transmission mechanism and the electric push rod are sequentially connected; after waiting for the temperature and pressure of the cylinder to be stable, the electric push rod is started to push the piston to reciprocate at a fixed speed through the transmission mechanism; the left and right tensile and compressive force sensors record the sum of the tensile data during reciprocation, which is the friction of the shell-piston ring under the environmental conditions; by modifying the pressure and temperature of the high-temperature and high-pressure gas source and the speed of the electric push rod, the friction of the shell-piston ring in different service environments can be obtained.

[0020] Technical effects: the test method and device for the shell-piston friction of the high-temperature aviation aerodynamic valve actuating device can simulate and test the friction of the shell-piston ring of the high-temperature aviation aerodynamic valve under different working conditions, and provide accurate friction data for the design and improvement of the high-temperature aviation aerodynamic valve. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of a device for testing the shell-piston friction of a high-temperature aviation aerodynamic valve;

[0022] Figure 2 It is a schematic diagram of a shell-piston structure;

[0023] Figure 3 It is a schematic diagram of a transmission mechanism structure;

[0024] Figure 4 It is a schematic diagram of a boss I;

[0025] Figure 5 It is a schematic diagram of a boss II.

[0026] 1-bleed valve piston cylinder, 2-tensile and compressive force sensor, 3-linear guide rail, 4-transmission mechanism, 5-electric push rod, 11-shell, 12-piston, 13-connecting rod; 41-front transmission rod, 42-right transmission rod, 43-left transmission rod, 44-rear transmission rod DETAILED DESCRIPTION

[0027] The technical solutions of the application will be described clearly and completely below with reference to the drawings, obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0028] Example 1

[0029] This invention provides a method and apparatus for testing the frictional force between the housing and piston of a high-temperature aero-pneumatic valve actuator, to simulate and test the frictional force between the housing and piston ring of a high-temperature aero-pneumatic valve under different operating conditions, providing accurate measured data for the frictional force model. The testing apparatus for the frictional force between the housing and piston of a high-temperature aero-pneumatic valve actuator includes: an air bleed valve piston cylinder (1), a tension / compression sensor (2), a linear guide rail (3), a transmission mechanism (4), and an electric push rod (5).

[0030] The aforementioned bleed valve cylinder consists of two sets, symmetrically placed to balance the air pressure on both sides. The two pistons are coaxially aligned for guidance, avoiding measurement errors. Both sets of cylinders are connected to a high-temperature, high-pressure air source.

[0031] The aforementioned air-draft valve piston cylinder includes: a housing, a piston, and a connecting rod.

[0032] The housing and piston are installed according to their service condition. The connecting rod connects two symmetrically placed pistons.

[0033] The piston connecting rod has a boss I in the middle, and the height of boss I is 5mm-10mm.

[0034] The transmission mechanism includes four transmission rods arranged in a "U" shape. The plane of the U-shaped transmission mechanism is parallel to the horizontal plane, and the directions of the left and right transmission rods are parallel to the piston axis. A rectangular through hole, 20mm wide and 30mm long, is located in the middle of the front and rear transmission rods. The front and rear sides of the rectangular through hole are perpendicular to the piston axis.

[0035] The left and right transmission rods are mounted on linear guide rails.

[0036] The front transmission rod passes under the piston connecting rod, and the piston connecting rod boss I is located in the middle of the front transmission rod hole.

[0037] The tension and compression sensors are installed at the connection points between the left and right transmission rods and the front transmission rod, and are used to test the friction force during the movement of the piston rings in the chamber.

[0038] The electric actuator is used to provide push and pull force to drive the piston movement. Its maximum movement range is 20mm, and its speed range is 1mm / s-20mm / s.

[0039] The electric push rod has a boss II on its front side, and the height of boss II is 5mm-10mm.

[0040] The electric push rod boss II is located in the middle of the rear transmission rod hole.

[0041] The combination structure of the boss-rectangular hole is used to transmit the tension and compression force of the electric push rod to drive the piston to move. The boss and the rectangular hole are not connected by a fixed mechanism, but by mutual contact to apply a normal force. This structure can cleverly eliminate the additional bending moment caused by the misalignment of the assembly of the components of the test device.

[0042] The electric push rod drives the piston to reciprocate through the transmission mechanism, and the friction force of the shell-piston ring under different working conditions can be measured. The specific steps include:

[0043] (1) Connect the electric push rod, transmission mechanism, linear guide rail, tension and compression force sensor, and shell-piston in sequence. Among them, the electric push rod, linear guide rail, and shell are fixed on the workpiece table through fixtures. The boss I of the piston connecting rod and the boss II of the electric push rod are placed in the center of the rectangular hole of the front and rear transmission rods of the transmission mechanism.

[0044] (2) The shell-piston, left and right side transmission rods, and electric push rod are coaxial.

[0045] (3) The plane where the transmission mechanism is located is parallel to the horizontal plane.

[0046] (4) Connect the shell to the high temperature and high pressure gas source, and adjust the temperature and gas pressure to the values under different working conditions. Let it stand for 10 minutes to ensure that the temperature is uniform in the cylinder.

[0047] (5) Control the electric push rod to reciprocate at a speed of v, and the movement stroke is fixed at 20mm.

[0048] (6) The electric push rod drives the transmission mechanism and the piston in sequence through the normal contact of the combination structure of the boss-rectangular hole.

[0049] (7) The boss I and the boss II have spherical structures on both the front and rear sides.

[0050] (8) When pushing the piston, the boss is in normal contact with the front side of the rectangular hole.

[0051] (9) When pulling the piston, the boss is in normal contact with the rear side of the rectangular hole.

[0052] (10) Record the force data F1 and F2 of the left and right tension and compression force sensors. At this time, the friction force of the shell-piston ring is F=(F1+F2) / 2.

[0053] (11) Modify the temperature and pressure of the gas source and the speed of the push rod to test the relationship between the friction force under different working conditions and the position of the piston in the shell.

[0054] (12) The average friction force of the two shell-pistons measured by the above examples is obtained.

[0055] (13) Further, take three shell-pistons, two two opposite test, can measure each piston in the shell friction.

[0056] The above specific embodiments or cases are only used to explain and illustrate the technical solutions of the present application, and are not intended to limit the present application. The parts not described in detail are regarded as conventional technical means in the art. It should be understood by those skilled in the art that, based on the design idea of the present application, the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high temperature aero-pneumatic valve housing-piston friction force testing device, characterized in that, The test device comprises a pneumatic valve piston cylinder, a tension and pressure sensor, a linear guide rail, a transmission mechanism and an electric push rod. The two sets of shell-pistons are symmetrically placed to balance the air pressure on both sides, and are coaxially guided by the two sets of shell-pistons to avoid introducing measurement errors due to misalignment. Each shell-piston comprises a shell, a piston and a connecting rod. The transmission mechanism is arranged on the linear guide rail, and connects the pneumatic valve piston and the electric push rod. The electric push rod is used to provide a pushing and pulling force to drive the piston to move linearly. The tension and pressure sensor is arranged at the position where the transmission mechanism is connected with the pneumatic valve piston cylinder, and is used to test the friction force when the piston ring moves.

2. A device for testing the friction force of a high-temperature aeronautical aerodynamic valve housing-piston, as claimed in claim 1, characterized in that, The length of the rectangular hole is 30 mm, and the length of the rectangular hole is 20 mm.

3. A device for testing the friction of a high temperature aerospace aerodynamic valve housing-piston as claimed in claim 1, characterized in that, The boss on the electric push rod and the boss on the connecting rod are respectively in contact with the side surface of the hole, so that the tension force is transmitted along the movement direction.

4. A device for testing the friction of a high temperature aerospace aerodynamic valve housing-piston as claimed in claim 1, characterized in that, The electric push rod has a boss II on the front side.

5. A device for testing the friction of a high temperature aerospace aerodynamic valve housing-piston as claimed in claim 1, characterized in that, The boss I is arranged in the middle position of the hole of the front side transmission rod.

6. A device for testing the friction force of a high-temperature aeronautical aerodynamic valve housing-piston, as set forth in claim 1, characterized in that, The boss I is arranged in the middle position of the hole of the front side transmission rod. The height of the boss I on the connecting rod of the shell-piston and the height of the boss II on the front side of the electric push rod are both 5 mm-10 mm. The maximum movement range of the piston is 20 mm, and the speed range is 1 mm / s-20 mm / s.

7. A test method for the friction force of a shell-piston suitable for a high-temperature aviation pneumatic valve actuator, the test method using the test device of any one of claims 1-6 to test the friction force under different temperatures, gas pressures, piston movement speeds and service times. During the test, the two piston cylinders are symmetrically placed, the connecting rod is arranged in the middle to connect the two pistons, and then the cylinders are connected to a high-temperature and high-pressure gas source; the connecting rod, the transmission mechanism and the electric push rod are sequentially connected; after the temperature and pressure of the cylinders are stable, the electric push rod is started to drive the piston to move back and forth at a fixed speed through the transmission mechanism; the sum of the tension data recorded by the left and right tension and pressure sensors during the reciprocating movement is the friction force of the shell-piston ring under the environmental conditions; by modifying the pressure and temperature of the high-temperature and high-pressure gas source and the speed of the electric push rod, the friction force of the shell-piston ring under different service environments can be obtained.

Images