High-precision pneumatic proportional-integral regulator

Abstract

A high-precision pneumatic proportional integral regulator, comprising a gas path component, a proportional unit, a throttling unit, an integral unit, an amplifier, a switching valve, a conversion unit and a blanking plate; the proportional unit, the throttling unit, the integral unit, the amplifier, the switching valve, the conversion unit and the blanking plate are mounted on the gas path component in a surface-mounted form, the internal air passage of the gas path component is communicated with the proportional unit, the throttling unit, the integral unit, the amplifier and the conversion unit, the proportional unit is communicated with the amplifier, and the amplifier is communicated with the integral unit. In the present invention, each functional unit is mounted on the gas path integrated component in a surface-mounted form, and then the communication between the functional units is realized through the internal air passage of the gas path integrated component. The design is reasonable and the structure is compact. In addition, through two signal amplifications and feedback of the proportional unit and the amplifier, and with the participation of the cone-cone throttling type integral unit, high-precision control of the pneumatic regulator is achieved.

Description

Technical Field:

[0001] The present invention relates to the technical field of pneumatic instruments in automatic control instruments, and particularly relates to a high-precision pneumatic proportional integral regulator. Background Art:

[0002] Pneumatic instruments are a major category of automatic instruments. In the 1950s and 1960s in China, they were introduced from abroad and gradually applied in industrial process control. They developed to a certain extent in the 1970s and 1980s. However, due to the rise of microelectronics technology, electronic instruments have seen unprecedented development and application, replacing pneumatic instruments in conventional fields. As a result, the development of pneumatic instruments has basically stagnated before they were fully mature.

[0003] However, with the development of industrial production, especially in the past decade or so, the fire and explosion prevention characteristics inherent in pneumatic instruments have inherent advantages in emerging industries such as deep water, shield tunneling, and tunnels. At the same time, new industries also put forward higher requirements for the control accuracy, reliability, and convenience of pneumatic instruments. Summary of the Invention:

[0004] In view of this, it is necessary to provide a high-precision pneumatic proportional integral regulator, which has high control accuracy, good reliability, and convenient calibration.

[0005] A high-precision pneumatic proportional integral regulator includes an air circuit component, a proportional unit, a throttling unit, an integral unit, an amplifier, a switching valve, a conversion unit, and a plug board; the proportional unit, the throttling unit, the integral unit, the amplifier, the switching valve, the conversion unit, and the plug board are installed on the air circuit component in a surface-mounted form. The internal air passage of the air circuit component is connected to the air passage interfaces of the proportional unit, the throttling unit, the integral unit, the amplifier, and the conversion unit. The proportional unit is connected to the amplifier, and the amplifier is connected to the integral unit.

[0006] Preferably, the air circuit component includes an air circuit integration block and a cover. An air circuit groove is provided on the air circuit integration block. The air circuit groove is connected to the air passage interfaces of the proportional unit, the throttling unit, the integral unit, the amplifier, and the conversion unit. The cover is fitted at the air passage interface and is installed on the air circuit integration block through screws to block and seal the air circuit groove.

[0007] Preferably, the proportional unit includes a housing, a swing plate, an inflatable bellows, an elastic bracket, a gear disk, a central shaft, a compression nut, a disc spring, a nozzle assembly, and a V-shaped elastic bracket. Four inflatable bellows assemblies representing the target value, the actual value, the positive feedback, and the negative feedback are arranged in a cross pattern between the swing plate and the housing. An elastic bracket is arranged in the center of the four inflatable bellows assemblies. There is a gear disk and a central shaft above the center of the housing. A compression nut and a disc spring are installed on the central shaft to press the gear disk against the upper surface of the housing. The nozzle assembly is fixed on the gear disk through the two legs of the V-shaped elastic bracket;

[0008] The nozzle assembly includes a nozzle seat, a nozzle, a nozzle ejector rod, a joint and a spare part nut. The nozzle, the nozzle ejector rod and the joint are installed on the nozzle seat and arranged together at the tip of the V-shaped elastic bracket. An annular slideway is provided on the swing plate. The lower end of the nozzle ejector rod is supported on the slideway of the swing plate. A circular baffle is arranged on the upper plane of the housing directly below the nozzle. Additionally, a proportional coefficient adjusting gear shaft is fixed on the housing and meshes with the central gear disc.

[0009] Preferably, two sets of leveling mechanisms are arranged respectively in the front-rear and left-right directions between the swing plate and the housing. The front-rear leveling mechanism includes a spring assembly composed of a spring, an upper seat, a lower seat and a nut at the front position of the housing. The upper seat is connected to the housing through a nut, and the lower seat is connected to the swing plate through a nut. The spring is welded together with the upper seat and the lower seat. At the rear position of the housing, it includes an adjusting screw, a spring seat, a limiting plate, an adjusting spring and a snap ring. The adjusting screw is constrained in the fixing hole on the housing through upper and lower snap rings and gaskets. The spring seat is connected to the adjusting screw through a thread. The spring seat and the limiting plate are welded together. The limiting plate is stuck on the side wall of the housing to limit the rotation of the spring seat. The adjusting spring is placed between the spring seat and the annular seat on the swing plate. The left-right leveling mechanism has the same structure as the front-rear leveling mechanism.

[0010] Preferably, the four inflation bellows assemblies representing the target value, actual value, positive feedback and negative feedback of the proportional unit respectively include bellows, upper covers, bases, setscrews and air pipe joints. The bellows are bonded to the upper covers and bases. The setscrew is screwed into the center of the base. One end of the air pipe joint is pressed into the center of the upper cover, and the other end is inserted into the air path hose to introduce air pressure into the bellows assembly. A hose slot is provided on the housing to fix the air path hose. A total of five air path hoses led from the four bellows assemblies and the air pipe joints of the nozzle assembly are respectively connected to the air pipe joints installed on the upper part of the rear side wall of the housing.

[0011] Preferably, a frame is arranged above the housing of the proportional unit, and a transparent plate and a proportional scale are pasted on the frame.

[0012] Preferably, the proportional unit is fixed on the air path integrated component through bolts, and the air pipe joint installed on the rear side wall of the proportional unit housing fits with the corresponding air path hole on the air path integrated component.

[0013] Preferably, the throttling unit includes a throttling element, a valve sleeve, a compression screw and a sealing ring. The throttling unit is installed in the installation hole of the air path integrated component and fixed by the compression screw.

[0014] Preferably, the integrating unit includes an integrating housing, a valve seat, a valve core, an integrating spring, an adjusting screw, an adjusting wheel disc, a scale, a pin shaft and a sealing ring. The valve seat is arranged in the inner hole of the integrating housing. The valve core and the valve seat achieve gas throttling through a conical structure at the right end. The integrating spring is sleeved in the middle of the valve core, with the left end closely attached to the rear seat of the valve core and the right end attached to the right inner wall of the valve seat. A sealing ring is provided on the rear seat of the valve core to achieve the seal between the rear seat of the valve core and the inner hole of the valve seat. A signal input chamber is formed between the rear seat of the valve core and the inner hole of the valve seat. The signal of the integrating unit enters the signal input chamber from the inner channel of the integrating housing and the lateral air duct of the valve seat, then passes through the conical sealing ring at the right end of the valve core and the valve seat, and finally is output through the air path hole in the integrating housing. The left end of the valve core is closely attached to the adjusting screw, and the adjusting screw is screwed into the inner hole of the integrating housing in a threaded manner. The adjusting wheel disc is connected to the adjusting screw through a lateral set screw, and the left end face of the adjusting wheel disc is attached with an integrating time scale. In addition, a pin shaft for indication is press-fitted into the left end face of the integrating housing.

[0015] Preferably, the amplifier includes a conical spring, a valve core, a first valve seat, a spring piece, a diaphragm assembly, a cover plate and a sealing cover. The diaphragm assembly is composed of a floating valve seat, an intermediate plate, a pressing ring, an exhaust ring, a gasket ring, a diaphragm and a sealing ring. The amplifier is installed on the special mounting seat hole of the air circuit integrated component.

[0016] Preferably, the switching valve includes a valve body, an adjusting screw, a pressing spring, a valve core, a sealing gasket, a sealing diaphragm, a pressing ring, a push rod, a diaphragm, a pressing sleeve and a rear cover. The adjusting screw, the pressing spring, the valve core, the sealing gasket, the sealing diaphragm, the pressing ring, the push rod, the diaphragm, the pressing sleeve and the rear cover are assembled in the valve body. One end of the pressing spring is assembled with the adjusting screw, and the other end is assembled with one end of the valve core. The other end of the valve core is butted against one end of the push rod. A pressing ring and a sealing diaphragm are assembled at the butting position of the valve core and the push rod. A sealing gasket is assembled on the valve core. The diaphragm and the pressing sleeve are assembled at the other end of the push rod. The rear cover is assembled on the valve body through screws and presses the diaphragm. The pressing sleeve slides in the central hole of the rear cover for guiding.

[0017] Preferably, the conversion unit includes a reversing plate and a sealing gasket. The reversing plate and the sealing gasket are installed on the air circuit integrated component. There are two groups of conversion units, and the conversion unit is used to realize the on-off switching of the air circuit.

[0018] Each functional unit of the present invention is installed on the air circuit integrated component in a surface-mounted form, and the communication between each functional unit is realized through the internal air duct of the air circuit integrated component. The design is reasonable and the structure is compact. In addition, through two times of signal amplification and feedback by the proportional unit and the amplifier, and with the participation of the conical-conical throttling type integrating unit, high-precision control of the pneumatic regulator is achieved. Description of the Drawings:

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a structural schematic diagram of the structural composition of a high-precision pneumatic proportional integral regulator;

[0021] Figure 2 It is a structural schematic diagram of the structural composition of the gas circuit integration component of the components included in the high-precision pneumatic proportional integral regulator;

[0022] Figure 3 It is a structural schematic diagram of the structural composition of the proportional unit of the components included in the high-precision pneumatic proportional integral regulator;

[0023] Figure 4 It is a structural schematic diagram of the structural composition of the throttle unit of the components included in the high-precision pneumatic proportional integral regulator;

[0024] Figure 5 It is a structural schematic diagram of the structural composition of the integral unit of the components included in the high-precision pneumatic proportional integral regulator;

[0025] Figure 6 It is a structural schematic diagram of the structural composition of the amplifier of the components included in the high-precision pneumatic proportional integral regulator;

[0026] Figure 7 It is a structural schematic diagram of the structural composition of the on-off valve of the components included in the high-precision pneumatic proportional integral regulator;

[0027] In the figure: Pneumatic circuit integration component 1, pneumatic circuit integration block 1.1, cover 1.2, proportional unit 2, housing 2.1, swing plate 2.2, elastic bracket 2.3, gear disc 2.4, central shaft 2.5, compression nut 2.6, disc spring 2.7, V-shaped elastic bracket 2.8, nozzle seat 2.9, nozzle 2.10, ejector rod 2.11, joint 2.12, spare part nut 2.13, adjusting gear shaft 2.14, spring 2.15, upper seat 2.16, lower seat 2.17, nut 2.18, adjusting screw 2.19, spring seat 2.20, limit plate 2.21, adjusting spring 2.22, snap ring 2.23, bellows 2.24, upper cover 2.25, base 2.26, set screw 2.27, air pipe joint 2.28, air pipe joint 2.29, frame 2.30, transparent plate 2.31, proportional scale 2.32, throttling unit 3, throttling element 3.1, valve sleeve 3.2, compression screw 3.3, sealing ring 3.4, integration unit 4, integration housing 4.1, valve seat 4.2, valve core 4.3, integration spring 4.4, adjusting screw 4.5, adjusting wheel disc 4.6, scale 4.7, pin shaft 4.8, amplifier 5, conical spring 5.1, valve core 5.2, first valve seat 5.3, shim 5.4, cover plate 5.5, cover 5.6, floating valve seat 5.7, intermediate plate 5.8, pressing ring 5.9, exhaust ring 5.10, spacer ring 5.11, diaphragm 5.12, switching valve 6, valve body 6.1, adjusting screw 6.2, compression spring 6.3, valve core 6.4, gasket 6.5, sealing diaphragm 6.6, pressing ring 6.7, ejector rod 6.8, diaphragm 6.9, bush 6.10, rear cover 6.11, conversion unit 7, pneumatic circuit integration component 1, first blanking plate 8, second blanking plate 9. Detailed implementation manners:

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0030] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] The present invention provides the following specific embodiments.

[0032] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 which shows a high-precision pneumatic proportional-integral regulator of the present invention with high control precision, good reliability and convenient calibration. It includes a proportional unit 2, a throttling unit 3, an integral unit 4, an amplifier 5, a switching valve 6, a conversion unit 7, a gas circuit integration component 1, a first plug plate 8 and a second plug plate 9. Among them, the proportional unit 2 and the throttling unit 3 are combined to realize the proportional control function of the regulator, while the integral unit 4 and the switching valve 6 are set for the integral control function. In addition, the amplifier 5 amplifies the output signal of the regulator both in terms of pressure and flow to ensure the stable and effective transmission of the signal. The gas circuit integration component 1 reasonably arranges and integrates the connecting gas circuits between the gas control units. The conversion unit 7 can realize the switching between the control gas circuits according to different working conditions. The first plug plate 8 and the second plug plate 9 are used to block the gas circuits.

[0033] Figure 2 is a schematic structural diagram of the gas circuit integration component 1, Figure 2 which shows that the gas circuit integration component 1 includes a gas circuit integration block 1.1 and a cover 1.2. A gas circuit groove is provided on the gas circuit integration block 1.1 to connect the gas circuit interfaces between the gas control units. The cover 1.2 is fixed to the gas circuit integration block by screws to achieve gas circuit blocking and sealing.

[0034] Figure 3 is a schematic structural diagram of the proportional unit 2, Figure 3The display ratio unit 2 includes a housing 2.1 and a swing plate 2.2. Four inflatable bellows assemblies representing the target value, actual value, positive feedback, and negative feedback are arranged in a cross pattern between the swing plate 2.2 and the housing 2.1. An elastic support 2.3 acting as a fulcrum is arranged at the central part of the four bellows assemblies. When the air pressure in the four bellows assemblies changes, the swing plate swings up and down around the central fulcrum. Above the center of the housing 2.1, there is a gear disk 2.4 and a central shaft 2.5. The gear disk 2.4 can rotate around the central shaft 2.5. The central shaft 2.5 passes through the inside of the housing and is anti-rotation in structure, so the central shaft 2.5 cannot rotate. A compression nut 2.6 and a disc spring 2.7 are installed on the central shaft 2.5 to press the gear disk against the upper surface of the housing. Also, due to the elastic deformation of the disc spring 2.7, it does not affect the rotation of the gear disk. There is also a nozzle assembly, which includes a V-shaped elastic support 2.8, a nozzle seat 2.9, a nozzle 2.10, a push rod 2.11, a joint 2.12, and a spare part nut 2.13. The nozzle assembly is fixed on the gear disk 2.4 through the two legs of the V-shaped elastic support 2.8 and screws. The nozzle 2.10, the nozzle push rod 2.11, and the joint 2.12 are installed on the nozzle seat 2.9 and are arranged together at the tip of the V-shaped elastic support 2.8. An annular slideway is provided on the swing plate 2.2. The lower end of the nozzle push rod 2.11 is supported on the slideway of the swing plate 2.2. A circular baffle is arranged on the upper plane of the housing 2.1 directly below the nozzle 2.10. When the air pressure in the bellows changes and the swing plate 2.2 swings up and down around the central fulcrum, it pushes the nozzle push rod 2.11 to drive the nozzle 2.10 to move up and down together, thereby changing the gap between the nozzle and the baffle, and causing the back pressure of the nozzle-baffle mechanism to change. Thus, the difference in pressure between the bellows assemblies representing the target value and the actual value is reflected in the back pressure change of the nozzle-baffle and amplification is achieved. There is also a proportionality coefficient adjustment gear shaft 2.14 fixed on the housing 2.1 and meshing with the central gear disk 2.4. Rotating the adjustment gear shaft 2.14 drives the central gear disk 2.4 and the nozzle assembly to rotate together, thereby changing the position of the fulcrum of the nozzle push rod 2.11 on the slideway of the swing plate 2.2. The change in the fulcrum position changes the force arm of the air pressure in the bellows. Different force arms cause different back pressure change values of the nozzle-baffle, thereby achieving the adjustment of different proportionality coefficients. Two leveling mechanisms are arranged between the swing plate 2.2 and the housing 2.1 in the front-rear and left-right directions respectively to level the starting position of the swing plate 2.2.The front and rear leveling mechanism includes a spring assembly composed of a spring 2.15, an upper seat 2.16, a lower seat 2.17, and a nut 2.18 at the front position of the housing 2.1. The upper seat 2.16 is connected to the housing 2.1 through the nut 2.18, and the lower seat 2.17 is connected to the swing plate 2.2 through the nut 2.18. The spring 2.15, the upper seat 2.16, and the lower seat 2.17 are welded together. At the rear position of the housing 2.1, it includes an adjusting screw 2.19, a spring seat 2.20, a limiting plate 2.21, an adjusting spring 2.22, and a snap ring 2.23. The adjusting screw 2.19 is constrained in the fixing hole on the housing 2.1 by the upper and lower snap rings 2.23 and gaskets, but can be adjusted and rotated. The spring seat 2.20 is connected to the adjusting screw 2.19 through a thread. The spring seat 2.20 and the limiting plate 2.21 are welded together. The limiting plate 2.21 is stuck on the side wall of the housing 2.1 to limit the rotation of the spring seat 2.20. The lower end of the adjusting spring 2.22 contacts the annular seat on the swing plate 2.2, and the upper end contacts the spring seat 2.20. By rotating the adjusting screw 2.19, the spring seat 2.20 can be moved up and down, causing the adjusting spring 2.22 to be stretched and compressed, and then pushing the swing plate 2.2 to swing up and down in the front and rear directions, so as to realize the leveling of the front and rear positions of the swing plate 2.2. The left and right leveling mechanisms have the same structure as the front and rear leveling mechanisms.

[0035] Four inflatable bellows components representing the target value, actual value, positive feedback, and negative feedback include a bellows 2.24, an upper cover 2.25, a base 2.26, a setscrew 2.27, and a gas pipe joint 2.28. The bellows 2.24 is bonded to the upper cover 2.25 and the base 2.26. The setscrew 2.27 is screwed into the center of the base to adjust the compression stroke of the bellows component. One end of the gas pipe joint 2.28 is pressed into the center of the upper cover 2.25, and the other end is inserted into the gas path hose to introduce air pressure into the bellows component. A hose slot is provided on the housing 2.1 to fix the gas path hose. A total of five gas path hoses led from the four bellows components and the nozzle component gas pipe joints are respectively connected to the gas pipe joint 2.29 installed on the upper part of the rear side wall of the housing 2.1.

[0036] Above the housing 2.1 of the proportional unit 2, a frame 2.30 is arranged. A transparent plate 2.31 and a proportional scale ruler 2.32 are pasted on the frame 2.30 to realize proportional scale indication and protection of the proportional unit 2.

[0037] Please also refer to Figure 1 and Figure 3 , the proportional unit 2 is fixed on the gas path integration component 1 through bolts, and the gas pipe joint 2.29 installed on the rear side wall of the housing of the proportional unit 2 fits with the corresponding gas path hole on the gas path integration component 1.

[0038] Please also refer to Figure 1 and Figure 4, the throttling unit 3 includes a throttling element 3.1, a valve sleeve 3.2, a compression screw 3.3 and a sealing ring 3.4. The throttling unit 3 is installed in the mounting hole of the pneumatic circuit integration component 1 and is fixed by the compression screw 3.3. The valve sleeve 3.2 is used to accommodate the throttling element 3.1. The throttling unit 3 and the nozzle-baffle mechanism of the proportional unit 2 are combined to control the output signal of the proportional unit.

[0039] Please refer to Figure 5 , the integrating unit 4 includes an integrating housing 4.1, a valve seat 4.2, a valve core 4.3, an integrating spring 4.4, an adjusting screw 4.5, an adjusting wheel disc 4.6, a scale 4.7, a pin shaft 4.8 and a sealing ring. The valve seat 4.2 is arranged in the inner hole of the integrating housing 4.1. The valve core 4.3 and the valve seat 4.2 achieve gas throttling through a conical structure at the right end. The integrating spring 4.4 is sleeved in the middle position of the valve core, with the left end closely attached to the rear seat of the valve core 4.3 and the right end attached to the right inner wall of the valve seat 4.2. A sealing ring is provided at the rear seat of the valve core 4.3 to achieve the seal between the rear seat of the valve core 4.3 and the inner hole of the valve seat 4.2. The rear seat of the valve core 4.3 and the inner hole of the valve seat 4.2 form a signal input chamber. The signal of the integrating unit 4 enters the signal input chamber from the inner channel of the integrating housing 4.1 and the lateral air duct of the valve seat 4.2, and then passes through the conical sealing ring at the right end of the valve core 4.3 and the valve seat 4.2, and finally outputs through the air path hole in the housing 4.1. The left end of the valve core 4.3 is closely attached to the adjusting screw 4.5. The adjusting screw 4.5 is screwed into the inner hole of the integrating housing 4.1. By rotating the adjusting screw 4.5, the valve core 4.3 is pushed to move to the right, thereby changing the area of the sealing ring between the valve core 4.3 and the valve seat 4.2, and realizing the adjustment of the throttling ability of the integrating unit 4. The adjusting wheel disc 4.6 is connected to the adjusting screw 4.5 through a lateral set screw. The left end face of the adjusting wheel disc 4.6 is attached with an integrating time scale 4.7. In addition, a pin shaft 4.8 for indication is press-fitted into the left end face of the integrating housing 4.1 to realize the indication of the integrating time.

[0040] The adjustable throttling characteristic of the integrating unit 4 is combined with the air capacitance chamber in the pneumatic circuit integration component 1, and the output is fed into the positive feedback bellows of the proportional unit 2 to realize the integrating function of the regulator.

[0041] Please refer to Figure 6 , it shows that the amplifier 5 includes a conical spring 5.1, a valve core 5.2, a first valve seat 5.3, a spring piece 5.4, a diaphragm assembly, a cover plate 5.5, a sealing cover 5.6, and the diaphragm assembly is composed of a floating valve seat 5.7, an intermediate plate 5.8, a compression ring 5.9, an exhaust ring 5.10, a cushion ring 5.11, a diaphragm 5.12 and a sealing ring. The amplifier 5 is used to amplify the output signal of the nozzle-baffle of the proportional unit 2 both in terms of pressure and flow rate, improving the control accuracy and sensitivity of the regulator.

[0042] Figure 1 It shows that the amplifier 5 is installed on the special mounting seat hole of the pneumatic circuit integration component 1 to achieve efficient use of space.

[0043] Figure 7 It shows that the switching valve 6 includes a valve body 6.1, an adjusting screw 6.2, a compression spring 6.3, a valve core 6.4, a gasket 6.5, a sealing diaphragm 6.6, a retaining ring 6.7, a push rod 6.8, a diaphragm 6.9, a bushing 6.10, and a rear cover 6.11. The switching valve 6 realizes connecting the input and output gas path interfaces of the integrating unit 4 under specific working conditions, making the integrating throttling effect ineffective and the integrating time tend to zero.

[0044] Figure 1 It also shows the conversion unit 7, with a total of two groups, which is composed of a reversing plate and a gasket and is installed on the gas path integration component 1 to realize the on-off switching of the gas path. Switching the first group of reversing plates can swap the two bellows through which the actual pressure and the set pressure of the proportional unit 2 lead, thereby realizing the forward and reverse action switching of the output of the proportional unit 2. Switching the second group of reversing plates can cut off the gas path from the integrating unit 4 to the positive feedback bellows, and the integrating time tends to infinity.

[0045] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A high-precision pneumatic proportional-integral regulator, characterized in that: The high-precision pneumatic proportional-integral regulator includes a gas circuit component, a proportional unit, a throttling unit, an integral unit, an amplifier, a switching valve, a conversion unit and a blanking plate; the proportional unit, the throttling unit, the integral unit, the amplifier, the switching valve, the conversion unit and the blanking plate are mounted on the gas circuit component in a surface mounting form. The internal air passage of the gas circuit component is communicated with the proportional unit, the throttling unit, the integral unit, the amplifier and the conversion unit. The proportional unit is communicated with the amplifier, and the amplifier is communicated with the integral unit; The gas circuit component includes a gas circuit integrated block and a cover. A gas circuit groove is provided on the gas circuit integrated block. The gas circuit groove communicates with the gas circuit interfaces of the proportional unit, the throttling unit, the integral unit, the amplifier and the conversion unit. The cover is fitted at the gas circuit interface and is mounted on the gas circuit integrated block by screws to block and seal the gas circuit groove; The proportional unit includes a housing, a swing plate, an inflatable bellows, an elastic bracket, a gear disk, a central shaft, a compression nut, a disc spring, a nozzle assembly and a V-shaped elastic bracket. Four inflatable bellows assemblies representing the target value, the actual value, the positive feedback and the negative feedback are arranged in a cross between the swing plate and the housing. An elastic bracket is arranged in the center of the four inflatable bellows assemblies. There are a gear disk and a central shaft above the center of the housing. A compression nut and a disc spring are mounted on the central shaft to press the gear disk on the upper surface of the housing. The nozzle assembly is fixed on the gear disk by two legs of the V-shaped elastic bracket; The nozzle assembly includes a nozzle seat, a nozzle, a nozzle ejector rod, a joint and a spare part nut. The nozzle, the nozzle ejector rod and the joint are mounted on the nozzle seat and are arranged together at the tip of the V-shaped elastic bracket. An annular slideway is provided on the swing plate. The lower end of the nozzle ejector rod is supported on the slideway of the swing plate. A circular baffle is arranged on the upper plane of the housing directly below the nozzle. In addition, a proportional coefficient adjusting gear shaft is fixed on the housing and meshes with the central gear disk.

2. The high-precision pneumatic proportional-integral regulator according to claim 1, wherein: Two groups of leveling mechanisms are arranged between the swing plate and the housing respectively in the front-rear and left-right directions. The front-rear leveling mechanism at the front position of the housing includes a spring assembly composed of a spring, an upper seat, a lower seat and a nut. The upper seat is connected to the housing by a nut, and the lower seat is connected to the swing plate by a nut. The spring is welded to the upper seat and the lower seat together; the rear position of the housing includes an adjusting screw, a spring seat, a limit plate, an adjusting spring and a snap ring. The adjusting screw is constrained in the fixing hole of the housing by upper and lower snap rings and gaskets. The spring seat is connected to the adjusting screw by a thread. The spring seat and the limit plate are welded together. The limit plate is stuck on the side wall of the housing to limit the rotation of the spring seat. The adjusting spring is placed between the spring seat and the annular seat on the swing plate. The left-right leveling mechanism has the same structure as the front-rear leveling mechanism.

3. The high-precision pneumatic proportional-integral regulator according to claim 2, characterized in that: The four inflatable bellows assemblies representing the target value, the actual value, the positive feedback and the negative feedback of the proportional unit respectively include a bellows, an upper cover, a base, a set screw and a gas pipe joint. The bellows is bonded to the upper cover and the base together. The set screw is screwed into the center of the base. One end of the gas pipe joint is pressed into the center of the upper cover, and the other end is inserted into the gas hose to introduce air pressure into the bellows assembly. A hose card slot is provided on the housing to fix the gas hose; A total of five gas hoses led from the gas pipe joints of the four bellows assemblies and the nozzle assembly are respectively connected to the gas pipe joints installed on the upper part of the rear side wall of the housing.

4. The high-precision pneumatic proportional-integral regulator according to claim 3, characterized in that: A frame is arranged above the shell of the proportional unit, and a transparent plate and a proportional scale ruler are pasted on the frame.

5. The high-precision pneumatic proportional-integral regulator according to claim 4, wherein: The proportional unit is fixed to the gas path integrated component by bolts, and the gas pipe joint installed on the rear side wall of the proportional unit housing is fitted with the corresponding gas path hole on the gas path integrated component.

6. The high-precision pneumatic proportional-integral regulator according to claim 5, characterized in that: The throttling unit comprises a throttling element, a valve sleeve, a clamping screw and a sealing ring. The throttling unit is installed in the mounting hole of the gas path integrated component and fixed by the clamping screw.

7. The high-precision pneumatic proportional-integral regulator according to claim 6, characterized in that: The integral unit comprises an integral housing, a valve seat, a valve core, an integral spring, an adjusting screw, an adjusting wheel, a scale, a pin and a sealing ring. The valve seat is arranged in the inner hole of the integral housing. The valve core and the valve seat realize gas throttling through a conical structure at the right end. The integral spring is sleeved in the middle of the valve core, with the left end close to the valve core back seat and the right end close to the right inner wall of the valve seat. The valve core back seat is provided with a sealing ring to realize the sealing of the valve core back seat and the inner hole of the valve seat. The valve core back seat and the inner hole of the valve seat form a signal input cavity. The integral unit signal enters the signal input cavity from the channel in the integral housing and the lateral airway of the valve seat, and then passes through the conical sealing ring at the right end of the valve core and the valve seat, and finally outputs through the air path hole in the integral housing; the left end of the valve core is close to the adjusting screw, and the adjusting screw is screwed into the inner hole of the integral housing; the adjusting wheel is connected to the adjusting screw through a lateral set screw, and the left end face of the adjusting wheel is affixed with an integral time scale, and a pin for indicating is installed in the left end face of the integral housing through interference fit.

8. The high-precision pneumatic proportional-integral regulator according to claim 7, wherein: The amplifier includes a conical spring, a valve core, a first valve seat, a spring, a diaphragm assembly, a cover plate, and a sealing cover, wherein the diaphragm assembly is composed of a floating valve seat, an intermediate plate, a pressure ring, an exhaust ring, a gasket, a diaphragm, and a sealing ring; the amplifier is installed on a special mounting seat hole of the gas circuit integrated component.

9. The high-precision pneumatic proportional-integral regulator according to claim 8, wherein: The switch valve includes a valve body, an adjusting screw, a compression spring, a valve core, a sealing gasket, a sealing diaphragm, a pressure ring, a push rod, a diaphragm, a pressure sleeve and a back cover. The adjusting screw, compression spring, valve core, sealing gasket, sealing diaphragm, pressure ring, push rod, diaphragm, pressure sleeve and back cover are assembled in the valve body. One end of the compression spring is assembled with the adjusting screw, and the other end is assembled with one end of the valve core. The other end of the valve core is butt-jointed with one end of the push rod. The butt joint between the valve core and the push rod is equipped with a pressure ring and a sealing diaphragm. The valve core is equipped with a sealing gasket. The diaphragm and the pressure sleeve are assembled at the other end of the push rod. The back cover is assembled on the valve body by screws and presses the diaphragm. The pressure sleeve slides in a guided manner in the center hole of the back cover.

10. The high-precision pneumatic proportional-integral regulator according to claim 1, characterized in that: The conversion unit includes a reversing plate and a sealing gasket, which are installed on the gas path integrated component. The conversion unit is divided into two groups and is used to realize the on-off switching of the gas path.

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