CN210565963U

CN210565963U - Temperature compensation damping pneumatic actuator

Info

Publication number: CN210565963U
Application number: CN201920712081.6U
Authority: CN
Inventors: 郭智; 曾华勇; 王虎成
Original assignee: SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY CO Ltd
Current assignee: SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY CO Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-05-19
Anticipated expiration: 2029-05-17

Abstract

The utility model provides a temperature compensation damping pneumatic actuator aims at providing one kind and solves pneumatic actuator and be difficult to realize the mechanism that the full stroke was dampened and is required. The utility model discloses a following technical scheme realizes: the gas-liquid working cylinder provided with the piston rod and other working mechanisms and the connected damping cylinders connected with the gas-liquid working cylinder in parallel in the same direction form a double-cylinder parallel structure, and the end parts of the damping cylinders are provided with valve control components; the piston rod end isolation piston divides the gas-liquid working cylinder into working air cavities, the gas-liquid working cylinder and the piston rod form an annular damping cavity along the axial direction, the on-off is realized by the opening and closing of the one-way damping valve between the damping cavity and the damping cylinder, and the isolation piston divides the damping cylinder into an oil storage cavity and an air storage cavity. The working air cavity is filled with air pressure to push the piston rod to extend out, the piston rod extrudes damping oil in the damping cavity to enter the oil storage cavity through a damping hole of a valve core of the one-way damping valve, reverse resistance is generated on the piston rod, the movement speed of the piston rod is reduced, and therefore the damping effect of the full movement stroke is realized.

Description

Temperature compensation damping pneumatic actuator

Technical Field

The utility model relates to a pneumatic actuator who mainly used trade pneumatic system actuating mechanism such as aviation, space flight, boats and ships, vehicle, large-scale engineering equipment has damping effect.

Background

A telescopic Actuator (Actuator) is a common type of Actuator in a hydropneumatic transmission system, and working media generally include both liquid and gas. The telescopic actuator (hydraulic actuator, pneumatic actuator, electromagnetic actuator, etc.) converts hydraulic energy or pneumatic energy into mechanical energy for operating the movable part. The actuators are basically classified into two types, a reciprocating linear actuator and a reciprocating swing type actuator. The reciprocating linear actuator is widely applied to movable parts such as retraction and release of landing gears, flaps and speed reducers, adjustment of tail nozzles and air inlet cones and the like on modern airplanes.

When the telescopic actuator drives a moving part of large mass and the moving speed is large, impact and noise due to mechanical collision occur when the piston/piston rod of the actuator moves to the extreme position due to the large inertia of the moving part. When the actuator uses liquid as the medium, the movement speed of the actuator can be realized by controlling the flow rate, because the liquid has incompressibility or low compressibility and the liquid medium is less affected by external factors such as ambient temperature, pressure and the like. When the flow of the system is large, the movement speed of the actuator can be reduced by arranging a valve control assembly such as a throttle valve or the like or integrating a buffer function of the actuator, and the impact load is absorbed. The working principle of the buffer device is that a certain volume of liquid in an oil discharge cavity of the actuator is sealed, and then the liquid is extruded out through a small throttling hole or a gap to cause back pressure, so that the movement speed of the piston/piston rod is slowed down to achieve the buffer purpose due to the increase of the resistance of an oil return cavity in the retracting process or when the piston/piston rod reaches the terminal point. The damping device is generally configured with an orifice, a circumferential seam, or a combination of orifices and circumferential seams. The buffering technology is widely applied to a hydraulic system, and the problem that impact load is large when the actuating cylinder extends to the limit position is solved. Unmanned aerial vehicle actuator is gaseous as the power supply in recent years most. Compared with liquid media, the gas media have larger compressibility, and the movement speed of the actuator cannot be effectively controlled through structures such as a valve control assembly, a throttling pore or a gap and the like. Therefore, the hydraulic actuator type shock absorbing device cannot effectively absorb and absorb the impact force by integrating the hydraulic actuator type shock absorbing device in the actuator. In addition, when the valve control assembly is applied, a large amount of gas leakage can be caused due to poor gas tightness of the valve control assembly, and the attenuation of the output power of a pneumatic system is obvious. Therefore, the existing hydraulic buffer technology can not well solve the problem that the pneumatic actuator has large impact force caused by too high speed in the movement process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problem that prior art exists, aim at providing a take temperature compensation's damping pneumatic actuator, it is under the prerequisite that has possessed actuator basic function, can solve pneumatic actuator and can't effectively avoid arousing the great problem of impact load because of the speed is too fast through the buffer who uses valve accuse subassembly or integrated hydraulic actuator type, and through the use of temperature compensation measure and valve accuse subassembly, make the damping function of actuator not receive temperature variation's influence and guarantee the structure safety of actuator.

The above object of the utility model can be realized through following technical scheme, a temperature compensation damping pneumatic actuator, include: through the cover 6 that obturates of gas-liquid working cylinder drill way assembly, back and forth movement in the gas-liquid working cylinder carries out the piston rod 4 of the external acting of pneumatic actuator, and the annular damping chamber 5 that the gas-liquid working cylinder formed along the axial with the piston rod, the isolation piston of tailpiece of the piston rod separates the left end of gas-liquid working cylinder for work air cavity 2, its characterized in that: the cylinder body of the gas-liquid working cylinder 3 is fixedly connected with a connected damping cylinder 18 which is connected with the gas-liquid working cylinder 3 in parallel in the same direction, the damping cavity 5 is separated from the damping cylinder 18 through a one-way damping valve assembled on the orifice of the damping cylinder 18, and the on-off between the damping cylinder 18 and the damping cavity 5 can be realized through the opening and closing of the one-way damping valve; a two-way moving partition piston 16 fitted in the damping cylinder 18 partitions the right end region in the cylinder into an oil storage chamber 15 and the left end region in the cylinder into an air reservoir chamber 17.

Compared with the prior art, the utility model has the following beneficial effects.

The utility model adopts a double-cylinder side-by-side structure consisting of a gas-liquid working cylinder provided with a piston rod and other working mechanisms and a conjoined damping cylinder 18 which is connected with the gas-liquid working cylinder side by side in the same direction, the gas-liquid working cylinder takes high-pressure gas as energy to drive the piston rod to extend out for acting, and the piston rod 4 is subjected to damping action in the whole extending process through an integrated damping mechanism, can provide damping force in proportion to the square value of the absolute movement speed of the vibration damping object, effectively slows down the movement speed of the piston rod 4, the damping coefficient is relatively stable within a certain temperature range, the problem that the pneumatic actuator cannot provide effective damping to improve the impact load caused by the fact that the movement speed of the actuator is too high due to the fact that a valve control assembly or a hydraulic integrated buffer device is installed in the pneumatic actuator is solved, the influence of impact and vibration on equipment is effectively reduced, and the problems of speed control and whole-course buffering in the working process of the pneumatic actuator are effectively solved.

The utility model discloses a damping oil in 4 extrusion damping chamber 5 of piston rod gets into oil storage chamber 15 through damping hole 10 on one-way damping valve's the case 8, under the throttle effect of damping hole 10, the damping oil pressure in the damping chamber 5 risees, produces the reverse resistance to piston rod 4, and piston rod 4 is being stretched out whole journey in the damping effect, has slowed down the velocity of motion of piston rod 4. By adding temperature compensation measures by using the valve control assembly, the oil in the damping cavity 5 can be automatically decompressed to prevent parts from being damaged when the temperature rises, and the gas in the gas storage cavity 17 is automatically decompressed to ensure the functions of constant air pressure and stable damping action; can realize 5 fluid automatic compensation in temperature reduction damping chamber, prevent that fluid from appearing vacuum damping effect unstability, gas storage chamber 17 is gaseous still can keep reasonable pressure value not to influence the damping effect, guarantees the function of actuator normal use. Through the use of the gas storage cavity and the valve control assembly, the damping oil in the damping cavity can be decompressed and the gas in the gas storage cavity can be decompressed when the temperature rises, the damping oil in the damping cavity is compensated when the temperature is reduced, and the stability of the damping function is ensured.

When the temperature of oil in the damping cavity 5 of the actuator rises due to heating, the volume expands, the pressure rises, and redundant high-pressure oil can enter the oil storage cavity 15 through the damping hole 10 on the valve element 8 of the one-way damping valve, so that the damage of parts caused by overhigh oil pressure of the damping cavity 5 is avoided; when the temperature of the oil in the damping cavity 5 is reduced, the volume is contracted, and the oil in the oil storage cavity 15 returns a part of the backflow to the damping cavity 5 under the air pressure action of the air storage cavity 17, so that the vacuum is prevented from being generated in the damping cavity 5. When the temperature of the gas in the gas storage cavity 17 is increased, the volume is expanded, the pressure is increased, and the high-pressure gas can push away the valve control assembly conical column valve core 23 to discharge redundant gas, so that the gas pressure in the gas storage cavity 17 is kept constant; when the temperature of the gas in the gas storage cavity 17 is reduced, the pressure is reduced, the opening pressure of the valve control assembly conical column valve core 23 and the volume of the gas storage cavity 17 are reasonably designed, so that the gas can still have a reasonable pressure value, and the damping function of the actuator is not influenced.

The utility model discloses each part of actuator is mechanical type and connects, and the good reliability. The pneumatic damping device has the advantages of compact structure, small volume, high response speed and no special limit requirement, and can be widely applied to pneumatic equipment with damping requirements.

Drawings

Fig. 1 is a sectional view of the temperature compensated damped pneumatic actuator of the present invention.

FIG. 2 is an enlarged partial cross-sectional view of the one-piece damper cylinder of FIG. 1.

Fig. 3 is a top sectional view of the temperature compensated damped pneumatic actuator of the present invention.

FIG. 4 is an enlarged partial cross-sectional view of a valve control assembly mounted on the end of a pneumatic actuator cylinder-to-cylinder damper cylinder.

In the figure: the gas-liquid separation type hydraulic control valve comprises a nozzle 1, a working gas cavity 2, a gas-liquid working cylinder 3, a piston rod 4, a damping cavity 5, a sealing sleeve 6, a valve body 7, a valve core 8, a first filter element 9, a damping hole 10, a second filter element 11, a plug 12, a spring 13, a filling nozzle 14, an oil storage cavity 15, a partition piston 16, an air storage cavity 17, a damping cylinder 18, a cylindrical shell 19, a valve core 20E, a compression spring 21, a valve seat 22, a conical column valve core 23, a tail spring 24 and a threaded plunger 25.

The present invention is further described with reference to the following figures and examples, but the invention is not limited thereby within the scope of the described embodiments. All such concepts are intended to be within the scope of the present disclosure and patent.

Detailed Description

See fig. 1-3. In the embodiments described below, a temperature compensated damped pneumatic actuator comprises: the hydraulic control valve comprises a cylinder body consisting of a gas-liquid working cylinder 3 and a connected damping cylinder 18 which is connected with the gas-liquid working cylinder 3 in parallel in the same direction, a piston rod 4 which is assembled in the gas-liquid working cylinder and performs the function of the actuator doing work to the outside, a sealing sleeve 6 which is arranged at the orifice of the gas-liquid working cylinder and is used for limiting the movement stroke of the piston rod, a one-way damping valve which is composed of a valve body 7, a valve core 8, a first filter core 9, a second filter core 11, a plug 12 and a spring 13 and is arranged at the orifice of the damping cylinder 18, a separation piston 16 which is assembled in the damping cylinder 18 and can move in two directions, and a valve control assembly which is arranged at the end part of the damping cylinder 18 and is communicated with the inner hole of the damping cylinder 18 and consists of a cylindrical shell 19. The left end of the gas-liquid working cylinder 3 is divided into a working air cavity 2 by an isolation piston at the end part of the piston rod 4, a damping cavity 5 is formed among the gas-liquid working cylinder 3, the piston rod 4, the sealing sleeve 6 and the one-way damping valve, an oil storage cavity 15 is formed among the damping cylinder 18, the separating piston 16 and the one-way damping valve, and an air storage cavity 17 is formed among the damping cylinder 18, the separating piston 16 and the valve control assembly. The damping cavity 5 and the damping cylinder 18 are separated by a one-way damping valve, and the on-off between the damping cylinder 18 and the damping cavity 5 can be realized through the opening and closing of the one-way damping valve.

The gas-liquid working cylinder 3 is provided with a nozzle 1 which is radially communicated with the working air cavity 2, high-pressure gas is introduced into the working air cavity 2 through the nozzle 1, when the piston rod 4 is pushed to extend, damping oil in the damping cavity 5 is extruded by the piston rod 4 and enters the oil storage cavity 15 through a damping hole 10 on a valve core 8 of the one-way damping valve, the damping oil in the damping cavity 5 is blocked in circulation under the throttling action of the damping hole 10, the pressure is increased, reverse resistance is generated on the piston rod 4, the damping action movement speed of the piston rod 4 in the extending whole process is controlled, and therefore the damping function of the full-movement stroke of the pneumatic actuator is realized.

The one-way damping valve in fig. 2 includes: the valve is provided with a valve body 7 communicated with a damping cavity 5, a plug 12 assembled in a cavity of the valve body, a spring 13 assembled in the plug 12, a valve core 8 which is acted by the spring 13 and is jointed with a conical surface of a port at the left end of the valve body 7, a filter element 9 which is connected with the valve core 8 through threads and is used for filtering oil, and a filter element 11 which is acted by the spring 13 and is assembled in a hole of the valve core 8 and is used for filtering the oil. The damping cylinder 18 is provided with a filling nozzle 14 communicated with the one-way damping valve, damping oil is filled into the damping cavity 5 through the filling nozzle 14 through the one-way damping valve to discharge gas in the damping cavity 5, and the amount of the damping oil filled into the actuator through the filling nozzle 14 can ensure that the distance between the separation piston 16 and the extreme position of the right end is a certain distance when the piston rod 4 retracts to the extreme position, and then the filling nozzle 14 is blocked.

In fig. 3, the valve control assembly mounted at the end of the damping cylinder 18 and communicated with the inner hole of the damping cylinder 18 comprises a cylindrical shell 19 provided with a filler neck, an E-shaped valve core 20 assembled in the cylindrical shell 19 and sleeved with a compression spring 21, a valve seat 22 assembled at the tail end of the cylindrical shell 19, opposite to the E-shaped valve core 20 and coaxially sleeved with the compression spring 21, a conical cylindrical valve core 23 sealed in a stepped hole of the valve seat 22 through a threaded plunger 25, and a tail spring 24 assembled in blind holes of the conical cylindrical valve core 23 and the threaded plunger 25.

The gas-liquid working cylinder 3 is provided with a nozzle 1 which is radially communicated with the working air cavity 2, a high-pressure air source leads air pressure to the working air cavity 2 through the nozzle 1 to push the piston rod 4 to extend out for applying work, the piston rod 4 extrudes damping oil in the damping cavity 5 in the extending process, the damping oil enters the oil storage cavity 15 through a damping hole 10 on a valve core 8 of the one-way damping valve and pushes a separation piston 16 in a damping cylinder 18 to move leftwards. Under the throttling action of the damping hole 10, the pressure of the damping oil in the damping cavity 5 rises, the hydraulic pressure is higher when the movement speed of the piston rod 4 is higher, and the hydraulic pressure in the damping cavity 5 reacts on the piston rod 4 to enable the piston rod 4 to receive the axial force opposite to the air pressure action of the working air cavity 2 to block the movement of the piston rod 4, so that the function of damping in the whole process of extending the piston rod 4 is realized; the partition piston 16 moves leftwards to reduce the volume of the air storage cavity 17, the air pressure rises, and the air is exhausted by pushing away the conical column valve core 23 on the valve control assembly, so that the air pressure in the air storage cavity 17 is kept stable, the damping force borne by the piston rod 4 is not influenced by the air pressure of the air storage cavity 17, and the stability of the damping action in the extending process of the piston rod 4 is realized. When the temperature of the damping oil in the damping cavity 5 rises, the volume is increased, the oil enters the oil storage cavity 15 through the damping hole 10 on the valve core 8 of the one-way damping valve, and the damage to parts caused by overhigh oil pressure in the damping cavity 5 is avoided; when the temperature of the damping oil in the damping cavity 5 is reduced, the volume is contracted, and the oil in the oil storage cavity 15 can return to the damping cavity 5 through a part of backflow of the one-way damping valve under the air pressure action of the air storage cavity 17, so that the vacuum generated in the damping cavity 5 is avoided. When the temperature of the gas in the gas storage cavity 17 is increased by heating, the volume is expanded, the pressure is increased, and the high-pressure gas can push away the valve control assembly conical column valve core 23 to discharge redundant gas, so that the gas pressure in the gas storage cavity 17 is kept constant; when the temperature of the gas in the gas storage cavity 17 is reduced, the pressure is reduced, and the opening pressure of the valve control assembly conical column valve core 23 and the volume of the gas storage cavity 17 are reasonably designed, so that the gas can still have a reasonable pressure value, and the damping function of the actuator is not influenced.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. Alternatives and modifications, the scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A temperature compensated damped pneumatic actuator comprising: through the cover (6) of obturating of gas-liquid working cylinder port assembly, back and forth movement in the gas-liquid working cylinder carries out piston rod (4) of pneumatic actuator external acting, and the gas-liquid working cylinder forms annular damping chamber (5) with the piston rod along the axial, and the isolation piston of tailpiece of the piston rod separates the left end of gas-liquid working cylinder for work air cavity (2), its characterized in that: the cylinder body of the gas-liquid working cylinder (3) is fixedly connected with a connected damping cylinder (18) which is connected with the gas-liquid working cylinder (3) in parallel in the same direction, the damping cavity (5) is separated from the damping cylinder (18) through a one-way damping valve assembled on an orifice of the damping cylinder (18), and the on-off between the damping cylinder (18) and the damping cavity (5) can be realized through the opening and closing of the one-way damping valve; a two-way moving partition piston (16) fitted in the damping cylinder (18) partitions the right end region in the cylinder into an oil storage chamber (15) and the left end region in the cylinder into an air storage chamber (17).

2. The temperature compensated damped pneumatic actuator of claim 1 wherein: the one-way damping valve includes: the valve comprises a valve body (7) provided with a communicated damping cavity (5), a plug (12) assembled in a valve body cavity, a spring (13) assembled in the plug (12), a valve core (8) attached to the conical surface of a port at the left end of the valve body (7) under the action of the spring (13), a first filter element (9) connected with the valve core (8) through threads and used for filtering oil, and a second filter element (11) assembled in a hole of the valve core (8) under the action of the spring (13) and used for filtering the oil.

3. The temperature compensated damped pneumatic actuator of claim 1 wherein: the damping cylinder (18) is provided with a filling nozzle (14) communicated with the one-way damping valve, damping oil is filled into the damping cavity (5) through the filling nozzle (14) through the one-way damping valve, gas in the damping cavity (5) is discharged, the damping oil amount injected into the actuator through the filling nozzle (14) ensures that the distance between the separation piston (16) and the limit position of the right end is a certain distance when the piston rod (4) retracts to the limit position, and then the filling nozzle (14) is blocked.

4. The temperature compensated damped pneumatic actuator of claim 1 wherein: the valve control assembly is arranged at the end part of the damping cylinder (18) and communicated with an inner hole of the damping cylinder (18), and comprises a cylindrical shell (19) provided with a filler neck, an E-shaped valve core (20) assembled in the cylindrical shell (19) and sleeved with a compression spring (21), a valve seat (22) assembled at the tail end of the cylindrical shell (19), a conical column valve core (23) packaged in a stepped hole of the valve seat (22) through a threaded plunger (25) and a tail spring (24) assembled in blind holes of the conical column valve core (23) and the threaded plunger (25), wherein the valve seat (22) is opposite to the E-shaped valve core (20) and coaxially sleeved with the compression spring (21).

5. The temperature compensated damped pneumatic actuator of claim 1 wherein: the gas-liquid working cylinder (3) is provided with a nozzle (1) which is radially communicated with the working air cavity (2), a high-pressure air source leads air pressure to the working air cavity (2) through the nozzle (1) to push the piston rod (4) to extend out for doing work, the piston rod (4) extrudes damping oil in the damping cavity (5) in the extending process, the damping oil enters the oil storage cavity (15) through a damping hole (10) on a valve core (8) of the one-way damping valve and pushes a separation piston (16) in the damping cylinder (18) to move leftwards.