CN113389767B - Double-acting pneumatic actuator with long-stroke and large-cylinder-diameter structure and control system thereof - Google Patents
Double-acting pneumatic actuator with long-stroke and large-cylinder-diameter structure and control system thereof Download PDFInfo
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- CN113389767B CN113389767B CN202110833995.XA CN202110833995A CN113389767B CN 113389767 B CN113389767 B CN 113389767B CN 202110833995 A CN202110833995 A CN 202110833995A CN 113389767 B CN113389767 B CN 113389767B
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- 238000007789 sealing Methods 0.000 claims description 45
- 230000004927 fusion Effects 0.000 claims description 10
- 238000013016 damping Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 2
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000004519 grease Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 isotopes thereof Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000010964 304L stainless steel Substances 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1471—Guiding means other than in the end cap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
Abstract
The invention relates to a double-acting pneumatic actuator with a long-stroke large-cylinder-diameter structure and a control system thereof. The pneumatic actuator comprises a front cylinder cover, a rear cylinder cover, a cylinder barrel, a front guide sleeve, a rear guide sleeve, a front throttle valve a, a rear throttle valve a, a piston, a front buffer plunger, a rear buffer plunger, a push rod guide sleeve and a push rod, wherein the cylinder barrel is arranged between the front cylinder cover and the rear cylinder cover, the front guide sleeve is arranged on the front cylinder cover, the rear guide sleeve is arranged on the rear cylinder cover, the front throttle valve a is arranged on the front guide sleeve, the rear throttle valve a is arranged on the rear guide sleeve, the piston is arranged in the cylinder barrel, and the front buffer plunger is arranged at the front end of the piston. The control system comprises an air inlet main pipeline, a first branch, a second branch, a third branch, a fourth branch and an exhaust main pipeline. The invention improves the space utilization rate of the device, ensures the running stability, the accuracy and the safety of the pneumatic actuator when the pneumatic actuator performs the high-thrust bidirectional movement, and prolongs the service life of the pneumatic system.
Description
Technical Field
The invention relates to the technical field of air and control, in particular to a double-acting pneumatic actuator with a long-stroke large-cylinder-diameter structure and a control system thereof.
Background
Large fusion devices are a major technological infrastructure project in which integrated engineering is being designed in China. The cryopump is used as one of key components of a vacuum system of a large fusion device, and is a direct place for adsorption and regeneration of discharge reaction products in a divertor chamber. During the operation of the plasma, the cryopump timely and efficiently pumps out the hydrogen, isotopes thereof, helium ash and other impurity particles in the divertor chamber, thereby providing a high vacuum environment for the stable operation of the plasma.
The opening and closing of the main valve are regulated by controlling the pneumatic actuating mechanism in the running process of the low-temperature pump, the required environment is provided for the adsorption and regeneration process of the low-temperature pump, and the pumping speed of the pump is regulated by precisely controlling the opening of the main valve. Therefore, whether the pneumatic actuator can safely and reliably operate directly affects the normal operation of the cryopump. The pneumatic actuator commonly used in commercial use is used on the main valve of the cryopump, and mainly has the following problems: (1) The main valve operates in the environment of high irradiation and strong magnetic field, and the electrical equipment contained in the pneumatic actuator is easy to fail, so that the pneumatic actuator cannot work normally; (2) The motion stroke of the main valve is longer, about 450mm, and the pretightening force required by the sealing at the main valve opening is larger, about 190kN, and the general pneumatic actuator cannot provide the larger sealing force required by the main valve under the working condition of longer stroke; (3) The motion of the main valve is horizontal reciprocating motion, and a common pneumatic actuator cannot provide bidirectional acting force.
Therefore, the double-acting pneumatic actuator with the long-stroke large-cylinder-diameter structure and the control system thereof are provided to meet the use requirement of the main valve of the low-temperature pump of the large fusion device, and are technical problems to be solved in the prior art.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a double-acting pneumatic actuator with a long-stroke large-cylinder-diameter structure and a control system thereof, so as to realize accurate and effective opening and closing of a main valve of a low-temperature pump of a large fusion device.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A double-acting pneumatic actuator with a long-stroke large-cylinder-diameter structure is characterized by comprising a front cylinder cover, a rear cylinder cover, a cylinder barrel, a front guide sleeve, a rear guide sleeve, a front throttle valve a, a rear throttle valve a, a piston, a front buffer plunger, a rear buffer plunger, a push rod guide sleeve and a push rod, wherein,
The cylinder barrel is arranged between the front cylinder cover and the rear cylinder cover, the front guide sleeve is arranged on the front cylinder cover, the rear guide sleeve is arranged on the rear cylinder cover, the front throttle valve a is arranged on the front guide sleeve, the rear throttle valve a is arranged on the rear guide sleeve, the piston is arranged in the cylinder barrel, the front buffer plunger is arranged at the front end of the piston, the rear buffer plunger is arranged at the rear end of the piston, the push rod guide sleeve is connected with the piston, the front buffer plunger and the rear buffer plunger, and the push rod is connected with the push rod guide sleeve.
Furthermore, an air inlet hole is formed in one side of the front cylinder cover, an air outlet hole is formed in the other side of the front cylinder cover, and a hanging ring is arranged on the front cylinder cover.
One side of the rear cylinder cover is provided with an air inlet hole, the air inlet hole and the air inlet hole on the front cylinder cover are positioned on the same side, the other side of the rear cylinder cover is provided with an air outlet hole, the air outlet hole and the air outlet hole on the front cylinder cover are positioned on the same side, the rear cylinder cover is provided with a lifting ring, and the lifting ring is collinear with the central line of the lifting ring on the front cylinder cover.
Furthermore, the cylinder barrel is fixedly connected with the front cylinder cover and the rear cylinder cover through stud bolts, and forms a closed cavity together with the front cylinder cover and the rear cylinder cover through sealing of a sealing element.
Further, two sealing grooves are formed in the opening of the front guide sleeve, a sealing piece is arranged between the front guide sleeve and the front cylinder cover to seal, an air inlet and an air outlet are formed in the front guide sleeve, and the opening and closing of the air inlet are controlled by adjusting the front throttle valve b.
The opening part of the rear guide sleeve is provided with two sealing grooves and bearing seat holes, a sealing piece is arranged between the rear guide sleeve and the rear cylinder cover for sealing, the rear guide sleeve is provided with an air inlet hole and an air outlet hole, and the opening and closing of the air inlet hole are controlled by adjusting the rear throttle valve b.
Further, the surfaces of the front throttle valve b and the rear throttle valve b are provided with threads and sealing grooves.
Further, a round hole is formed in the center of the piston and detachably connected with the push rod guide sleeve, and two sealing grooves e and guide ring grooves are formed in the outer side of the piston.
Further, the front buffer plunger and the rear buffer plunger are provided with damping surfaces, are detachably connected with the push rod guide sleeve, and are sealed by a sealing piece arranged between the front buffer plunger and the rear buffer plunger and the piston.
Furthermore, the push rod and the push rod guide sleeve are of tubular structures, and after being matched and installed, the central lines of the push rod and the push rod guide sleeve are collinear.
According to another aspect of the present invention, a control system using the pneumatic actuator described above is provided, comprising an intake main line, a first branch, a second branch, a third branch, a fourth branch, an exhaust main line, a gas source, a ball valve, a filter, a pressure setter, a pressure gauge, a safety valve, a three-way valve, and a muffler, wherein,
The air inlet main pipeline is connected with the air source, the first branch pipeline is connected with the air inlet main pipeline and the air inlet hole of the air cylinder cover in front of the pneumatic actuator, the second branch pipeline is connected with the air inlet main pipeline and the air inlet hole of the air cylinder cover in back of the pneumatic actuator, the third branch pipeline is connected with the air outlet hole of the air cylinder cover in front of the pneumatic actuator, the fourth branch pipeline is connected with the air outlet hole of the air cylinder cover in back of the pneumatic actuator, and the air outlet main pipeline is connected with the third branch pipeline and the fourth branch pipeline.
Further, the air inlet main pipeline is provided with a ball valve, a filter, a pressure constant value device and a pressure gauge. The first branch is provided with a pressure constant value device, a pressure gauge and a ball valve. The second branch is provided with a pressure constant value device, a pressure gauge and a ball valve. The third branch is provided with a ball valve and a pressure gauge. The fourth branch is provided with a ball valve and a pressure gauge. The exhaust main pipeline is provided with a three-way valve and a muffler.
The invention has the beneficial effects that:
The invention aims at improving the existing pneumatic actuator and a control system thereof, so that the pneumatic actuator can normally operate in the environment of high irradiation and strong magnetic field, and meets the use requirement of a main valve of a low-temperature pump of a large fusion device.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram showing a cross-sectional structure of a double-acting pneumatic actuator with a long stroke and large cylinder diameter structure.
Fig. 2 is a schematic diagram showing a cross-sectional structure of a double-acting pneumatic actuator with a long-stroke large-diameter structure.
Fig. 3 is a left side view of a double acting pneumatic actuator of a long stroke large bore configuration.
Fig. 4 is a partial enlarged view at a of fig. 1.
Fig. 5 is a partially enlarged view at B of fig. 1.
Fig. 6 is a schematic structural view of a pneumatic actuator piston.
Fig. 7 is a D-D view of fig. 6.
Fig. 8 is a partial enlarged view at C of fig. 2.
Fig. 9 is a schematic structural view of a cryopump of a large fusion device.
FIG. 10 is a schematic structural view of a control system for a pneumatic actuator.
The reference numerals include:
1-front cylinder head, 2-rear cylinder head, 3-cylinder barrel, 4-front guide sleeve, 5-rear guide sleeve, 6-front throttle valve a, 7-rear throttle valve a, 8-piston, 9-front buffer plunger, 10-rear buffer plunger, 11-push rod guide sleeve, 12-push rod, 13-front cylinder head air inlet hole, 14-rear cylinder head air inlet hole, 15-main valve, 16-front cylinder head air outlet hole, 17-rear cylinder head air outlet hole, 18-hanging ring, 19-stud, 20-seal groove a, 21-seal groove b, 22-front guide sleeve air inlet hole, 23-front guide sleeve air outlet hole, 24-front throttle valve b, 25-seal groove C, 26-sealing groove d, 27-rear guide sleeve air inlet hole, 28-rear guide sleeve exhaust hole, 29-rear throttle valve b, 30-bearing seat hole, 31-sealing groove e, 32-guide ring groove, 33-damping surface of buffer plunger, A1-pneumatic actuator, G1-air source, F1-filter, S1-muffler, V1-V5-ball valve, V6-safety valve, V7-three-way valve, C1-C3-pressure constant value device, P1-P5-pressure gauge, m 1-main air inlet pipeline, m 101-first branch, m 102-second branch, m 201-third branch, m 202-fourth branch, m 2-main air exhaust pipeline.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The embodiment provides a double-acting pneumatic actuator with a long-stroke large-cylinder-diameter structure and a control system thereof, which are pneumatic actuators and control systems thereof applied to a main valve of a low-temperature pump of a large fusion device. The aim of the invention can be achieved by the following technical scheme:
Referring to fig. 1 to 9, the long-stroke large-bore structure double-acting pneumatic actuator provided in this embodiment includes a front cylinder head 1, a rear cylinder head 2, a cylinder barrel 3, a front guide sleeve 4, a rear guide sleeve 5, a front throttle valve a6, a rear throttle valve a7, a piston 8, a front buffer plunger 9, a rear buffer plunger 10, a push rod guide sleeve 11, and a push rod 12. The cylinder barrel 3 is arranged between the front cylinder cover 1 and the rear cylinder cover 2, the front guide sleeve 4 is arranged on the front cylinder cover 1, the rear guide sleeve 5 is arranged on the rear cylinder cover 2, the front throttle valve a6 is arranged on the front guide sleeve 4, the rear throttle valve a7 is arranged on the rear guide sleeve 5, the piston 8 is arranged in the cylinder barrel 3, the front buffer plunger 9 is arranged at the front end of the piston 8, the rear buffer plunger 10 is arranged at the rear end of the piston 8, the push rod guide sleeve 11 is connected with the piston 8 and the front and rear buffer plungers 10, and the push rod 12 is connected with the push rod guide sleeve 11.
According to another embodiment of the invention, a control system of a pneumatic actuator is provided, which comprises an air inlet main pipeline m1, a first branch pipeline m101, a second branch pipeline m102, a third branch pipeline m201, a fourth branch pipeline m202, an air exhaust main pipeline m2, an air source G1, ball valves V1-V5, a filter F1, pressure positioners C1-C3, pressure gauges P1-P5, a safety valve V6, a three-way valve V7 and a muffler S1. The air inlet main pipeline m1 is connected with the air source, the first branch pipeline m101 is connected with the air inlet main pipeline m1 and an air inlet hole of the front cylinder cover 1 of the pneumatic actuator A1, the second branch pipeline m102 is connected with the air inlet main pipeline m1 and an air inlet hole of the rear cylinder cover 2 of the pneumatic actuator A1, the third branch pipeline m201 is connected with an air outlet hole of the front cylinder cover 1 of the pneumatic actuator A1, the fourth branch pipeline m202 is connected with an air outlet hole of the rear cylinder cover 2 of the pneumatic actuator A1, and the air outlet main pipeline is connected with the third branch pipeline m201 and the fourth branch pipeline m202, as shown in FIG. 10.
As shown in fig. 1, 2 and 3, in order to further optimize the above scheme, one side of the front cylinder head 1 of the pneumatic actuator A1 is provided with a front cylinder head air inlet hole 13, the other side is provided with a front cylinder head air outlet hole 16, one side of the rear cylinder head 2 of the pneumatic actuator A1 is provided with a rear cylinder head air inlet hole 14, which is positioned on the same side as the front cylinder head air inlet hole 13 on the front cylinder head 1, the other side is provided with a rear cylinder head air outlet hole 17, which is positioned on the same side as the front cylinder head air outlet hole 16 on the front cylinder head 1, in order to facilitate the lifting of the pneumatic actuator A1, the front cylinder head 1 and the rear cylinder head 2 are provided with lifting rings 18, and the central lines of the two lifting rings 18 are collinear.
In order to further optimize the scheme, the cylinder barrel 3 is fixedly connected with the front cylinder cover 1 and the rear cylinder cover 2 through stud bolts 19, and forms a closed cavity together with the front cylinder cover 1 and the rear cylinder cover through rubber sealing rings, and the cylinder barrel 3, the front cylinder cover 1 and the rear cylinder cover 2 are made of 304L stainless steel materials, as shown in figure 2.
In order to further optimize the scheme, the opening part of the front guide sleeve 4 is provided with two sealing grooves, a sealing groove a20 is provided with a sealing ring for sealing between the front guide sleeve 4 and the main valve 15, a sealing groove b21 is provided with a felt ring for preventing lubricating grease in a cylinder from leaking along with the movement of the main valve 15, a sealing ring is arranged between the front guide sleeve 4 and the front cylinder cover 1 for sealing, the front guide sleeve 4 is provided with a front guide sleeve air inlet hole 22 and a front guide sleeve air outlet hole 23, and the opening and closing of the air inlet hole are controlled by adjusting the front throttle valve b24, as shown in figures 1,2 and 4.
In order to further optimize the scheme, the opening part of the rear guide sleeve 5 is provided with two sealing grooves and a bearing seat hole 30, a sealing ring is arranged at the sealing groove c25 for sealing between the rear guide sleeve 5 and the push rod guide sleeve 11, a felt ring is arranged at the sealing groove d26 for preventing lubricating grease in the cylinder from leaking along with the movement of the main valve 15, a sealing piece is arranged between the rear guide sleeve 5 and the rear cylinder cover 2 for sealing, the bearing seat hole 30 is used for installing a linear motion bearing and storing lubricating grease required by the movement of the lubricating piston 8, a rear guide sleeve air inlet hole 27 and a rear guide sleeve air outlet hole 28 are arranged on the rear guide sleeve 5, and the opening and closing of the air inlet hole is controlled by adjusting the rear throttle valve b29 as shown in figures 1,2 and 5.
To further optimize the above solution, the front throttle b24 and the rear throttle b29 are provided with threads and sealing grooves on their surfaces.
In order to further optimize the scheme, the piston 8 is made of an aluminum alloy material, a round hole is formed in the center of the piston 8 and detachably connected with the push rod guide sleeve 11, two sealing grooves e31 and a guide ring groove 32 are formed in the outer side of the piston 8, a sealing ring is installed in the sealing groove e31 and used for sealing between the piston 8 and the cylinder barrel 3, a guide ring is installed in the guide ring groove 32 and used for guaranteeing stability of the piston 8 in reciprocating motion, and the guide ring is made of polytetrafluoroethylene composite materials, as shown in fig. 6 and 7.
In order to further optimize the above solution, during the operation of the piston 8, the cylinder end cover, the guide sleeve, etc. are easy to be damaged due to the impact, so that the damping surfaces 33 of the front buffer plunger 9 and the rear buffer plunger 10 are provided as buffer devices to reduce the impact, and the buffer plungers are detachably connected with the push rod guide sleeve 11, and are sealed with the piston 8 by a sealing ring.
In order to further optimize the scheme, the push rod 12 and the push rod guide sleeve 11 are of tubular structures, and after being matched and installed, the central lines of the push rod 12 and the push rod guide sleeve 11 are collinear, as shown in fig. 1.
In order to further optimize the above solution, the inlet main line m1 is provided with a ball valve V1, a filter F1, a pressure setter C1 and a pressure gauge P1. The first branch m101 is provided with a pressure setter C3, a pressure gauge P3 and a ball valve V3. The second branch m102 is provided with a pressure setter C2, a pressure gauge P2 and a ball valve V2. The third branch m201 is provided with a ball valve V5 and a pressure gauge P5. The fourth branch m202 is provided with a ball valve V4 and a pressure gauge P4. The exhaust main pipe is provided with a three-way valve V7 and a muffler S1 as shown in fig. 10.
When the main valve of the low-temperature pump of the large fusion device is required to be closed, the ball valves V1, V3, V4 and V7 are opened, the ball valves V2 and V5 are closed, so that clean and dry compressed air enters the front cylinder cover air inlet hole 13 of the front cylinder cover 1 through the air inlet main pipeline m1 and the first branch pipeline m101, the main valve 15 is driven to be closed through the piston 8, and the compressed air in the rear cavity is discharged to the environment through the fourth branch pipeline m202 and the air outlet main pipeline m 2. When the main valve 15 of the cryogenic pump of the large fusion device is required to be opened, the ball valves V3 and V4 are closed, the ball valves V1, V2, V5 and V7 are opened, so that clean and dry compressed air enters the air inlet hole 14 of the rear cylinder cover 2 through the main air inlet pipeline m1 and the second branch pipeline m102, the main valve 15 is driven to be opened through the piston 8, and the compressed air in the front cavity is discharged to the environment through the third branch pipeline m201 and the main air outlet pipeline m 2. Since the residual pressure of the discharged compressed air is high, strong noise is generated, and a muffler S1 is provided on the exhaust pipe to reduce noise pollution, thereby reducing exhaust noise. The safety valve V6 is always in operation during operation of the main valve 15, mainly to prevent the device from being damaged by the excessive pressure in the pipeline.
The foregoing is merely illustrative of the structure of this invention and many variations may be made in the specific embodiments and application scope by those skilled in the art based on the teachings herein without departing from its structure or its scope beyond the scope defined in the appended claims.
Claims (8)
1. The double-acting pneumatic actuator with the long-stroke large cylinder diameter structure is characterized by being a pneumatic actuator applied to a main valve of a low-temperature pump of a large fusion device, and comprises a front cylinder cover (1), a rear cylinder cover (2), a cylinder barrel (3), a front guide sleeve (4), a rear guide sleeve (5), a front throttle valve a (6), a rear throttle valve a (7), a piston (8), a front buffer plunger (9), a rear buffer plunger (10), a push rod guide sleeve (11) and a push rod (12),
The cylinder barrel (3) is arranged between the front cylinder cover (1) and the rear cylinder cover (2), the front guide sleeve (4) is arranged on the front cylinder cover (1), the rear guide sleeve (5) is arranged on the rear cylinder cover (2), the front throttle valve a (6) is arranged on the front guide sleeve (4), the rear throttle valve a (7) is arranged on the rear guide sleeve (5), the piston (8) is arranged in the cylinder barrel (3), the front buffer plunger (9) is arranged at the front end of the piston (8), the rear buffer plunger (10) is arranged at the rear end of the piston (8), the push rod guide sleeve (11) is connected with the piston (8) and the front buffer plunger (10), and the push rod (12) is connected with the push rod guide sleeve (11).
An air inlet hole is formed in one side of the front cylinder cover (1), an air outlet hole is formed in the other side of the front cylinder cover, and a hanging ring (18) is arranged on the front cylinder cover (1);
an air inlet hole is formed in one side of the rear cylinder cover (2), the air inlet hole of the rear cylinder cover is positioned on the same side as the air inlet hole of the front cylinder cover (1), an air outlet hole is formed in the other side of the rear cylinder cover, the air outlet hole of the rear cylinder cover is positioned on the same side as the air outlet hole of the front cylinder cover (1), a lifting ring (18) is arranged on the rear cylinder cover (2), and the lifting ring (18) is collinear with the central line of the lifting ring (18) on the front cylinder cover (1);
two sealing grooves are formed in the opening of the front guide sleeve (4), a sealing piece is arranged between the front guide sleeve (4) and the front cylinder cover (1) for sealing, an air inlet hole and an air outlet hole are formed in the front guide sleeve (4), and the opening and closing of the air inlet hole of the front guide sleeve are controlled by adjusting the front throttle valve b (24);
The opening part of the rear guide sleeve (5) is provided with two sealing grooves and bearing seat holes (30), a sealing piece is arranged between the rear guide sleeve (5) and the rear cylinder cover (2) for sealing, the rear guide sleeve (5) is provided with an air inlet hole and an air outlet hole, and the opening and closing of the air inlet hole of the rear guide sleeve are controlled by adjusting the rear throttle valve b (29).
2. A double-acting pneumatic actuator of a long-stroke large-bore structure according to claim 1, characterized in that the cylinder barrel (3) is fixedly connected with the front cylinder head (1) and the rear cylinder head (2) by stud bolts (19) and forms a closed chamber together with the front cylinder head (1) and the rear cylinder head (2) by sealing with a sealing element.
3. A double acting pneumatic actuator of long stroke large bore construction according to claim 1 wherein the front and rear throttle b (24, 29) surfaces are provided with threads and sealing grooves.
4. The double-acting pneumatic actuator with the long-stroke and large-cylinder-diameter structure according to claim 1, wherein a round hole is formed in the center of the piston (8), the piston is detachably connected with the push rod guide sleeve (11), and a sealing groove e (31) and a guiding ring groove (32) are formed in the outer side of the piston.
5. A double acting pneumatic actuator of long stroke large bore construction according to claim 1, characterized in that the front (9) and rear (10) buffer plungers are provided with damping surfaces, detachably connected to the push rod guide sleeve (11), and sealed with the piston (8) by a seal.
6. A double-acting pneumatic actuator of a long-stroke large-cylinder-diameter structure according to claim 1, characterized in that the push rod (12) and the push rod guide sleeve (11) are of tubular structures, and the central lines of the push rod (12) and the push rod guide sleeve are collinear after being matched and installed.
7. A control system for a double-acting pneumatic actuator with a long-stroke large-cylinder-diameter structure, which is applied to any one of claims 1 to 6, and is characterized by comprising an air inlet main pipeline (m 1), a first branch pipeline (m 101), a second branch pipeline (m 102), a third branch pipeline (m 201), a fourth branch pipeline (m 202), an air outlet main pipeline (m 2), an air source (G1), a ball valve, a filter (F1), a pressure constant device, a pressure gauge, a safety valve (V6), a three-way valve (V7) and a muffler (S1), wherein,
The air inlet main pipeline (m 1) is connected with the air source (G1), the first branch pipeline (m 101) is connected with an air inlet hole of the air inlet main pipeline (m 1) and an air inlet hole of the air cylinder cover (1) in front of the air actuator (A1), the second branch pipeline (m 102) is connected with the air inlet hole of the air inlet main pipeline (m 1) and an air inlet hole of the air cylinder cover (2) behind the air actuator, the third branch pipeline (m 201) is connected with an air outlet hole of the air cylinder cover (1) in front of the air actuator (A1), the fourth branch pipeline (m 202) is connected with an air outlet hole of the air cylinder cover (2) behind the air actuator (A1), and the air outlet main pipeline (m 2) is connected with the third branch pipeline (m 201) and the fourth branch pipeline (m 202).
8. The control system according to claim 7, characterized in that the inlet main line (m 1) is provided with a ball valve, a filter (F1), a pressure setter and a pressure gauge; the first branch (m 101) is provided with a pressure constant value device, a pressure gauge and a ball valve; the second branch (m 102) is provided with a pressure constant value device, a pressure gauge and a ball valve; the third branch (m 201) is provided with a ball valve and a pressure gauge; the fourth branch (m 202) is provided with a ball valve and a pressure gauge; the exhaust main pipeline (m 2) is provided with a three-way valve and a muffler (S1).
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| CN202110833995.XA CN113389767B (en) | 2021-07-23 | 2021-07-23 | Double-acting pneumatic actuator with long-stroke and large-cylinder-diameter structure and control system thereof |
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| CN202110833995.XA CN113389767B (en) | 2021-07-23 | 2021-07-23 | Double-acting pneumatic actuator with long-stroke and large-cylinder-diameter structure and control system thereof |
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