A pneumatic regulating valve

Abstract

The present invention discloses a pneumatic regulating valve, which belongs to the technical field of pneumatic valves. The pneumatic regulating valve comprises a valve sleeve and a valve core sleeved in an upper position in the valve sleeve, wherein the valve core is provided with four layers of airflow control channels from top to bottom, and the first layer of airflow control channels is provided with four first-layer first vents, first-layer second vents, first-layer third vents and first-layer fourth vents in sequence which are connected with a central channel in the middle of the valve core; the valve sleeve is provided with a first cylinder opening channel, a second cylinder opening channel, a third cylinder opening channel and a fourth cylinder opening channel. The present invention does not require an external pneumatic control valve or an electric control system, and only needs to provide compressed air of conventional pressure. The throttling effect is achieved by pneumatically controlling the upward and downward movement of pistons in four cylinders, and the response speed of opening and closing is fast, while also playing a role in preventing leakage.

Description

Technical Field

[0001] The invention relates to a pneumatic regulating valve, belonging to the technical field of pneumatic valves. Background Art

[0002] Pneumatic control valve is an important actuator in industrial automation process control. It receives control signals from the regulator and controls the movement of the piston through the pneumatic actuator, thereby controlling the flow of fluid and achieving precise control of the production process. During the control process, this valve drives the piston up and down through compressed air (generally 0.5-0.6Mpa). The airflow has only two states: on and off. It can only control the fluid switch, and cannot control the flow rate through the pressure of the airflow. This is also the main defect of the pneumatic diaphragm control valve (no throttling function).

[0003] The Chinese invention patent with publication number CN117329344A discloses a pneumatic regulating valve with adjustable flow rate, which uses a pneumatic actuator 10 to drive a second control rod 60 to move up and down in a fixed bracket 20, and uses the second control rod 60 to drive a first control rod 50 to move up and down inside the fixed bracket 20, and the bottom end of the first control rod 50 pulls the piston block 40 upward to separate the bottom end of the piston block 40 from the bottom of the inner wall of the valve body 30, and controls the bottom end of the piston block 40 according to the upward displacement distance of the first control rod 50 inside the fixed bracket 20. The distance between the bottom of the inner wall of the valve body 30 and the bottom of the inner wall of the valve body 30 is adjusted, thereby realizing the regulation and control of the liquid flow rate inside the valve body 30; in addition, the driving motor 22 drives the first control rod 50 to rotate inside the movable plate 31, and the movable plate 31 moves downward inside the piston block 40. At this time, the two sealing plates 32 at the bottom of the movable plate 31 extend from the bottom of the piston block 40 at the same time, and the distance between the bottom of the inner wall of the valve body 30 and the bottom of the piston block 40 is adjusted through the two sealing plates 32, and the two sealing plates 32 are used to replace the piston block 40 to regulate the flow rate inside the valve body 30.

[0004] In the above patent, it is unclear how the pneumatic actuator 10 drives the second control rod 60 to rise or fall to different heights, so as to control the flow rate. In addition, a drive motor is set in the valve to control the flow rate. On the one hand, it is difficult to accurately control the up and down strokes. On the other hand, the structure is too complicated and difficult to implement in practical applications.

[0005] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0006] In view of the deficiencies in the background technology, the present invention provides a pneumatic regulating valve, which does not require an external pneumatic control valve or an electronic control system. It only needs to provide compressed air of conventional pressure, and achieves throttling by pneumatically controlling the upward and downward movement of pistons in four cylinders. The valve has a fast response speed for opening and closing, and also plays a role in preventing leakage.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A pneumatic regulating valve comprises a valve sleeve and a valve core sleeved in the upper position of the valve sleeve, wherein four cylinders are arranged at the lower position inside the valve sleeve and are evenly distributed along the circumference of the center of the valve sleeve, and each cylinder is provided with a piston slidably mounted up and down, and a spring is arranged in the cavity at the upper end of the piston in the cylinder, and the lower end of the upper piston is connected to a conical plug through a piston rod;

[0009] An upper water outlet sleeve and a lower water inlet sleeve are fixedly mounted at the lower end of the valve sleeve, a water baffle is arranged between the lower end of the valve sleeve and the upper water outlet sleeve, the piston rod passes through the water baffle, the piston rod and the water baffle are sealed by a sealing sleeve, an orifice plate is arranged between the upper water outlet sleeve and the lower water inlet sleeve, and four water inlets corresponding to the conical plugs are arranged on the orifice plate;

[0010] The valve core is provided with four layers of airflow control channels from top to bottom, and the first layer of airflow control channels is provided with four first-layer first vents, first-layer second vents, first-layer third vents and first-layer fourth vents in sequence which are connected to the central channel in the middle of the valve core, and the first-layer first vents, first-layer second vents, first-layer third vents and first-layer fourth vents are respectively located at 60 degrees, 120 degrees, 180 degrees and 240 degrees of the valve core;

[0011] The second-layer airflow control channel is provided with two second-layer first vents and second-layer second vents connected to the central channel in the middle of the valve core in sequence, and the second-layer first vents and second-layer second vents are respectively located at 0 degrees and 60 degrees of the valve core;

[0012] The valve sleeve is provided with a first cylinder opening flow channel, a second cylinder opening flow channel, a third cylinder opening flow channel and a fourth cylinder opening flow channel in sequence along its circumference. The first cylinder opening flow channel, the second cylinder opening flow channel, the third cylinder opening flow channel and the fourth cylinder opening flow channel are respectively located at 0 degrees, 60 degrees, 180 degrees and 240 degrees of the valve sleeve. The lower ends of the four opening flow channels are respectively connected to the rod cavities of the four cylinder barrels one by one, and the upper ends are connected to the inner cavity of the valve sleeve where the valve core is placed.

[0013] Furthermore, a supply flow channel is provided in the middle position of the valve sleeve, and the supply flow channel includes an intake flow channel and an intake connector which are inter-connected. The intake flow channel is arranged along the radial direction of the valve sleeve, the outer end of the intake flow channel leads to the outside of the valve sleeve, and the inner end of the intake flow channel is connected to the intake connector which is axially arranged.

[0014] Furthermore, the height positions of the upper ends of the first cylinder opening channel and the second cylinder opening channel are adapted to the positions of the first layer of airflow control channels of the valve core, and the height positions of the upper ends of the third cylinder opening channel and the fourth cylinder opening channel are adapted to the positions of the second layer of airflow control channels of the valve core.

[0015] Further, the third-layer airflow control channel is provided with a third-layer first exhaust port, a third-layer second exhaust port, a third-layer third exhaust port and a third-layer fourth exhaust port in sequence, and the third-layer first exhaust port, the third-layer second exhaust port, the third-layer third exhaust port and the third-layer fourth exhaust port are respectively located at 60 degrees, 120 degrees, 180 degrees and 240 degrees of the valve core;

[0016] The fourth-layer airflow control channel is provided with a fourth-layer first exhaust port and a fourth-layer second exhaust port in sequence, and the fourth-layer first exhaust port and the fourth-layer second exhaust port are respectively located at 60 degrees and 120 degrees of the valve core;

[0017] The valve sleeve is provided with a first cylinder closed flow channel, a second cylinder closed flow channel, a third cylinder closed flow channel and a fourth cylinder closed flow channel in sequence along its circumference. The lower ends of the four closed flow channels are respectively connected to the rodless cavities of the four cylinder barrels one by one, and the upper ends are connected to the inner cavity of the valve sleeve where the valve core is placed.

[0018] The first cylinder closed flow channel, the second cylinder closed flow channel, the third cylinder closed flow channel and the fourth cylinder closed flow channel are respectively located at 0 degrees, 60 degrees, 120 degrees and 180 degrees of the valve sleeve. The height positions of the upper ends of the first cylinder closed flow channel and the second cylinder closed flow channel are adapted to the position of the third layer of airflow control flow channel of the valve core. The height positions of the upper ends of the third cylinder closed flow channel and the fourth cylinder closed flow channel are adapted to the position of the fourth layer of airflow control flow channel of the valve core.

[0019] Furthermore, an annular flow channel is provided at the bottom of the valve core, and the annular flow channel leads to the outside of the valve core through the side outlet flow channel, and a plurality of first exhaust flow channels are provided inside the valve core, and the first exhaust port of the third layer, the second exhaust port of the third layer, the third exhaust port of the third layer, the fourth exhaust port of the third layer, the first exhaust port of the fourth layer and the second exhaust port of the fourth layer are all connected to the annular flow channel through the first exhaust flow channel;

[0020] The outer ring of the bottom surface of the valve core is provided with a chamfer, and the chamfer of the bottom surface of the valve core and the inner cavity of the valve sleeve form a first annular cavity, and the first annular cavity leads to the outside of the valve sleeve through the lower exhaust port.

[0021] Furthermore, an arc-shaped third-layer intake air channel is provided on the third-layer air flow control channel of the valve core, the starting end of the third-layer intake air channel is at the 0-degree position of the valve core, and the third-layer intake air channel extends clockwise, so that the central angle corresponding to the third-layer intake air channel is 60 degrees, and the third-layer intake air channel is connected with the central channel through the gas channel; an arc-shaped fourth-layer intake air channel is provided on the fourth-layer air flow control channel of the valve core, the starting end of the fourth-layer intake air channel is at the 0-degree position of the valve core, and the fourth-layer intake air channel extends clockwise, so that the central angle corresponding to the fourth-layer intake air channel is 180 degrees.

[0022] Furthermore, the valve core has an upper and lower section with different radial dimensions along its axial direction, so that it is stepped in the axial direction, the first layer of airflow control flow channel and the second layer of airflow control flow channel are located in the upper section of the valve core with a larger radial dimension, and the third layer of airflow control flow channel and the fourth layer of airflow control flow channel are located in the lower section of the valve core with a smaller radial dimension; the edge of the bottom surface of the upper section of the valve core is chamfered, and the chamfer of the bottom surface of the upper section of the valve core and the inner cavity of the valve sleeve form a second annular cavity, and the second annular cavity leads to the outside of the valve sleeve through the upper exhaust port.

[0023] Further, an arc-shaped first-layer exhaust flow channel is provided on the first-layer airflow control flow channel, the starting end of the first-layer exhaust flow channel is at the 300-degree position of the valve core, and the first-layer exhaust flow channel extends counterclockwise, so that the central angle corresponding to the first-layer exhaust flow channel is 60 degrees;

[0024] The second layer of airflow control flow channel is provided with an arc-shaped second layer of exhaust flow channel, the starting end of the second layer of exhaust flow channel is at a 120 degree position of the valve core, and the second layer of exhaust flow channel extends counterclockwise, so that the central angle corresponding to the second layer of exhaust flow channel is 120 degrees;

[0025] The first layer of exhaust flow channel is connected to the second annular cavity through a first axial flow channel, the first axial flow channel is arranged axially at a 300 degree position, and the second layer of exhaust flow channel is connected to the second annular cavity through a second axial flow channel, the second axial flow channel is arranged axially at a 120 degree position.

[0026] Furthermore, a radial groove is provided at the positions of 0 degrees and 180 degrees respectively on the bottom surface of the upper section of the valve core, and six balls that can elastically slide up and down are arranged axially on the surface of the valve sleeve that cooperates with the bottom surface of the upper section of the valve core, and the corresponding central angle between adjacent balls is 60 degrees, and the radial groove cooperates with the balls.

[0027] After adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0028] 1. In the process of rotating the valve core, the 1st, 2nd, 3rd and 4th gears of the valve core correspond to opening 1 water inlet, 2 water inlets, 3 water inlets and 4 water inlets on the orifice plate respectively, so there is no need for an external pneumatic control valve or electronic control system. Only compressed air of conventional pressure is needed to conveniently control the flow of the fluid as needed, thereby playing a throttling role.

[0029] 2. When the corresponding gear position on the valve core coincides with the reference line, compressed gas is introduced into the rod chamber of the corresponding cylinder, pushing the piston to overcome the elastic force of the spring and move upward. At the same time, the corresponding rodless chamber of the cylinder leads to the outside of the valve sleeve through the flow channel, preventing the formation of positive pressure in the rodless chamber of the cylinder when the piston moves upward, thereby causing the tapered plug and the corresponding orifice plate to have a slow response speed or incomplete separation of the water inlet, resulting in poor valve opening effect.

[0030] 3. By respectively arranging the third-layer intake flow channel and the fourth-layer intake flow channel on the third-layer airflow control flow channel and the fourth-layer airflow control flow channel of the valve core, no matter which gear is in, the rodless chamber of the cylinder in the closed state is connected with compressed air, so that the corresponding piston is pressed downward under the action of the spring and compressed air, effectively preventing the leakage of the fluid, and automatically achieving a good sealing effect through the compressed gas.

[0031] 4. When the valve is adjusted from a high gear to a low gear, the corresponding piston moves downward, thereby increasing the pressure in the rod chamber of the corresponding cylinder. The compressed air is eventually discharged from the second annular cavity and the upper exhaust port to the outside of the valve sleeve, so that when the water inlet of the orifice plate is opened to the closed state, positive pressure is avoided in the rod chamber of the cylinder, which affects the closing effect.

[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is an exploded view of the assembly of the present invention;

[0034] Figure 2 is a half-section view of the present invention;

[0035] Figure 3 yes Figure 2 A top view of

[0036] Figure 4 yes Figure 2 Section view along AA;

[0037] Figure 5 yes Figure 2 Sectional view along BB;

[0038] Figure 6 yes Figure 2 Sectional view along CC;

[0039] Figure 7 yes Figure 2 Sectional view along DD;

[0040] Figure 8 It is the front view of the valve core;

[0041] Fig. 9 yes Figure 8 A top view of

[0042] Fig.10 yes Fig. 9 Left view of;

[0043] Fig.11 yes Figure 8 Cross-sectional view along the middle edge EE;

[0044] Fig.12 yes Figure 8 Cross-sectional view at the middle edge FF;

[0045] Fig.13 yes Figure 8 Sectional view at the middle edge GG;

[0046] Fig.14 yes Figure 8 Sectional view at the middle edge HH;

[0047] Fig.15 It is a three-dimensional diagram of the valve core.

[0048] In the figure,

[0049] 1-valve sleeve, 101-supply flow channel, 1011-intake flow channel, 1012-intake joint, 102-lower exhaust port, 103-upper exhaust port, 104-reference line, 105-ball, 111-first cylinder open flow channel, 112-second cylinder open flow channel, 113-third cylinder open flow channel, 114-fourth cylinder open flow channel, 121-first cylinder closed flow channel, 122-second cylinder closed flow channel, 123-third cylinder closed flow channel, 124-fourth cylinder closed flow channel, 2-valve core, 201-central flow channel, 202-annular flow channel, 203-first exhaust flow channel, 204-side outlet flow channel, 205-first axial flow channel, 206-second axial flow channel, 207-radial groove, 210 -First layer exhaust flow channel, 211-first layer first air port, 212-first layer second air port, 213-first layer third air port, 214-first layer fourth air port, 220-second layer exhaust flow channel, 221-second layer first air port, 222-second layer second air port, 230-third layer intake flow channel, 231-third layer first exhaust port, 232-third layer second exhaust port, 233-third layer third exhaust port, 234-third layer fourth exhaust port, 240-fourth layer intake flow channel, 241-fourth layer first exhaust port, 242-fourth layer second exhaust port, 3-piston, 4-spring, 5-water baffle, 6-sealing sleeve, 7-conical plug, 8-upper water outlet jacket, 9-orifice plate, 10-lower water inlet jacket. DETAILED DESCRIPTION

[0050] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0051] like Figure 1-3 As shown, the present invention provides a pneumatic regulating valve, comprising a valve sleeve 1 and a valve core 2 sleeved in the upper position of the valve sleeve 1, a knob is installed on the upper end of the valve core 2, and the valve core 2 is driven to rotate in the valve sleeve 1 by twisting the knob, and four cylinders are evenly distributed along the circumference of the center of the valve sleeve 1 at the lower position of the inner side of the valve sleeve 1, each cylinder is slidably installed with a piston 3, a spring 4 is provided in the cavity at the upper end of the piston 3 in the cylinder, and the lower end of the upper piston 3 is connected to the conical plug 7 through a piston rod.

[0052] An upper water outlet sleeve 8 and a lower water inlet sleeve 10 are fixedly installed at the lower end of the valve sleeve 1, a water baffle 5 is provided between the lower end of the valve sleeve 1 and the upper water outlet sleeve 8, the piston rod passes through the water baffle 5, the piston rod and the water baffle 5 are sealed by a sealing sleeve 6, an orifice plate 9 is provided between the upper water outlet sleeve 8 and the lower water inlet sleeve 10, and four water inlets corresponding to the conical plug 7 are provided on the orifice plate 9.

[0053] The valve core 2 is provided with four layers of air flow control channels from top to bottom, such as Figure 8-14The first-layer airflow control channel is provided with four first-layer first vents 211, first-layer second vents 212, first-layer third vents 213 and first-layer fourth vents 214 which are connected to the central channel 201 in the middle of the valve core 2 in sequence.

[0054] The top of the valve core 2 is provided with 0 gear, 1 gear, 2 gear, 3 gear and 4 gear, and the corresponding central angle between each gear position is 60 degrees. For the convenience of description, the 0 gear position on the upper surface of the valve core 2 (the 0 gear of the valve core 2 is aligned with the valve sleeve reference line as the initial position of the valve closed) is defined as 0 degrees in the axial projection position, along the counterclockwise direction (from top to bottom), such as Fig.11 , the first layer first vent 211 , the first layer second vent 212 , the first layer third vent 213 and the first layer fourth vent 214 are respectively located at 60 degrees, 120 degrees, 180 degrees and 240 degrees of the valve core 2 .

[0055] like Fig.12 The second-layer air flow control channel is provided with two second-layer first air vents 221 and second-layer second air vents 222 connected to the central channel 201 in the middle of the valve core 2 in sequence. The second-layer first air vents 221 and the second-layer second air vents 222 are respectively located at 0 degrees and 60 degrees of the valve core 2.

[0056] like Figure 4 The valve sleeve 1 is provided with a first cylinder opening flow channel 111, a second cylinder opening flow channel 112, a third cylinder opening flow channel 113 and a fourth cylinder opening flow channel 114 in sequence along its circumference. The lower ends of the four opening flow channels are respectively connected to the rod chambers of the four cylinders in a one-to-one correspondence, and the upper ends are connected to the inner cavity of the valve sleeve 1 where the valve core 2 is placed;

[0057] The projection position of the reference line 104 on the upper surface of the valve sleeve 1 in the axial direction is now defined as 0 degrees. Along the clockwise direction (from top to bottom), the first cylinder opening flow channel 111, the second cylinder opening flow channel 112, the third cylinder opening flow channel 113 and the fourth cylinder opening flow channel 114 are respectively at 0 degrees, 60 degrees, 180 degrees and 240 degrees of the valve sleeve 1. The height positions of the upper ends of the first cylinder opening flow channel 111 and the second cylinder opening flow channel 112 are adapted to the positions of the first layer of airflow control flow channels of the valve core 2, and the height positions of the upper ends of the third cylinder opening flow channel 113 and the fourth cylinder opening flow channel 114 are adapted to the positions of the second layer of airflow control flow channels of the valve core 2.

[0058] Attached Figure 1-14 In the embodiment, the position of the valve core 2 is the position where the 0th gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1. In this position, the spring 4 in the cylinder presses the four pistons 3, so that the four conical plugs 7 block the water inlet of the orifice plate 9. Figure 2 , Figure 3 , Figure 4 , Figure 7-Figure 12 In the process, the valve core 2 is rotated to make the first gear of the valve core 2 coincide with the reference line 104 of the valve sleeve 1, the vent at the upper end of the first cylinder opening flow channel 111 coincides with the first vent 211 of the first layer, and the central flow channel 201 of the valve core 2 is passed with compressed air (at 0.5-0.6Mpa), and the compressed air enters the rod chamber of the first cylinder from the vent at the lower end of the first cylinder opening flow channel 111, so that the piston 3 overcomes the elastic force of the upper end spring 4 and moves upward, so that the tapered plug 7 at its lower end is separated from the first water inlet of the corresponding orifice plate 9, so that the fluid in the lower water inlet jacket 10 passes through the orifice plate 9 The first water inlet of the orifice plate 9 flows upward into the upper water outlet sleeve 8 and then flows out; when the valve core 2 is rotated to make the 2nd gear of the valve core 2 coincide with the reference line 104 of the valve sleeve 1, the air vent at the upper end of the flow channel 111 opened by the first cylinder coincides with the second air vent 212 of the first layer. At this time, the air vent at the upper end of the flow channel 112 opened by the second cylinder coincides with the first air vent 211 of the first layer, so that compressed air is introduced into the rod chambers of the first cylinder and the second cylinder, so that the first water inlet and the second water inlet of the orifice plate 9 are opened; when the 3rd gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1, the third cylinder opens The air vent at the upper end of the flow channel 113 coincides with the first air vent 221 of the second layer. At this time, the air vent at the upper end of the flow channel 111 opened by the first cylinder coincides with the third air vent 213 of the first layer, and the air vent at the upper end of the flow channel 112 opened by the second cylinder coincides with the second air vent 212 of the first layer, thereby allowing compressed air to pass into the rod chambers of the first cylinder, the second cylinder and the third cylinder, so that the first water inlet, the second water inlet and the third water inlet of the orifice plate 9 are opened; when the 4th gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1, the 4th cylinder opens the air vent at the upper end of the flow channel 114. The air port coincides with the first air port 221 of the second layer, and the air port at the upper end of the opening channel 113 of the third cylinder coincides with the second air port 222 of the second layer. At this time, the air port at the upper end of the opening channel 111 of the first cylinder coincides with the fourth air port 214 of the first layer, and the air port at the upper end of the opening channel 112 of the second cylinder coincides with the third air port 213 of the first layer, so that compressed air is introduced into the rod cavities of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder, so that the first water inlet, the second water inlet, the third water inlet and the fourth water inlet of the orifice plate 9 are all opened.

[0059] In the process of rotating the valve core 2, the 1st gear, 2nd gear, 3rd gear and 4th gear of the valve core 2 correspond to opening 1 water inlet, 2 water inlets, 3 water inlets and 4 water inlets on the orifice plate 9 respectively, so there is no need for an external pneumatic control valve or an electronic control system. Only compressed air at conventional pressure needs to be provided to conveniently control the flow of the fluid as needed, thereby playing a throttling role.

[0060] A supply flow channel 101 is provided in the middle position of the valve sleeve 1, and the supply flow channel 101 includes an inlet flow channel 1011 and an inlet connector 1012 which are mutually interpenetrating. The inlet flow channel 1011 is arranged along the radial direction of the valve sleeve 1, and the outer end of the inlet flow channel 1011 leads to the outside of the valve sleeve 1, and the inner end of the inlet flow channel 1011 is connected to the axially arranged inlet connector 1012. When the valve core 2 is sleeved in the valve sleeve 1, the inlet connector 1012 is inserted into the lower opening of the central flow channel 201 of the valve core 2.

[0061] like Fig.13 The third-layer airflow control channel is provided with a third-layer first exhaust port 231, a third-layer second exhaust port 232, a third-layer third exhaust port 233 and a third-layer fourth exhaust port 234 in sequence. The third-layer first exhaust port 231, the third-layer second exhaust port 232, the third-layer third exhaust port 233 and the third-layer fourth exhaust port 234 are respectively located at 60 degrees, 120 degrees, 180 degrees and 240 degrees of the valve core 2.

[0062] like Fig.14 The fourth-layer air flow control channel is provided with a fourth-layer first exhaust port 241 and a fourth-layer second exhaust port 242 in sequence. The fourth-layer first exhaust port 241 and the fourth-layer second exhaust port 242 are located at 60 degrees and 120 degrees respectively.

[0063] like Fig.15 An annular flow channel 202 is provided at the bottom of the valve core 2, and the annular flow channel 202 leads to the outside of the valve core 2 through the side outlet flow channel 204. A plurality of first exhaust flow channels 203 are provided inside the valve core 2, and the third-layer first exhaust port 231, the third-layer second exhaust port 232, the third-layer third exhaust port 233, the third-layer fourth exhaust port 234, the fourth-layer first exhaust port 241 and the fourth-layer second exhaust port 242 are all connected to the annular flow channel 202 through the first exhaust flow channel 203.

[0064] The outer ring of the bottom surface of the valve core 2 is chamfered, and the bottom chamfer of the valve core 2 and the inner cavity of the valve sleeve 1 form a first annular cavity, and the first annular cavity leads to the outside of the valve sleeve 1 through the lower exhaust port 102. Figure 1 , Figure 2 .

[0065] like Figure 2 , Figure 3 , Figure 5 , Figure 6The valve sleeve 1 is provided with a first cylinder closed flow channel 121, a second cylinder closed flow channel 122, a third cylinder closed flow channel 123 and a fourth cylinder closed flow channel 124 in sequence along its circumference. The lower ends of the four closed flow channels are respectively connected to the rodless chambers of the four cylinders in a one-to-one correspondence, and the upper ends are connected to the inner cavity of the valve sleeve 1 where the valve core 2 is placed. The first cylinder closed flow channel 121, the second cylinder closed flow channel 122, the third cylinder closed flow channel 123 and the fourth cylinder closed flow channel 124 are respectively at the positions of 0 degrees, 60 degrees, 120 degrees and 180 degrees of the valve sleeve 1. The height positions of the upper ends of the first cylinder closed flow channel 121 and the second cylinder closed flow channel 122 are adapted to the position of the third layer of the airflow control flow channel of the valve core 2, and the height positions of the upper ends of the third cylinder closed flow channel 123 and the fourth cylinder closed flow channel 124 are adapted to the position of the fourth layer of the airflow control flow channel of the valve core 2.

[0066] like Figure 2 , Figure 3 , Figure 5 , Figure 6 , Fig.13 , Fig.14In the process, the valve core 2 is rotated. When the first gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1, at this time, the air vent at the upper end of the first cylinder closed flow channel 121 is connected to the first exhaust port 231 of the third layer. In the first gear, when the piston 3 in the first cylinder moves up, the rodless chamber of the first cylinder enters the first exhaust port 231 of the third layer through the first cylinder closed flow channel 121, and flows through the first exhaust flow channel 203 and the annular flow channel 202 in sequence, and finally leads to the outside of the valve sleeve 1 from the side outlet flow channel 204 and the lower exhaust port 102; when the second gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1, the air vent at the upper end of the first cylinder closed flow channel 121 is connected to the first exhaust port 231 of the third layer. When the air is closed, the vent at the upper end of the closed flow channel 121 of the first cylinder is connected to the second exhaust port 232 of the third layer, and the vent at the upper end of the closed flow channel 122 of the second cylinder is connected to the first exhaust port 231 of the third layer. In the second gear, when the pistons 3 in the first cylinder and the second cylinder move up, the rodless chamber of the first cylinder enters the second exhaust port 232 of the third layer through the closed flow channel 121 of the first cylinder, and the rodless chamber of the second cylinder enters the first exhaust port 231 of the third layer through the closed flow channel 122 of the second cylinder. Finally, the compressed gas in the rodless chambers of the first cylinder and the second cylinder is discharged from the lower exhaust port 10 2 leads to the outside of the valve sleeve 1; when the 3rd gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1, the vent at the upper end of the closed flow channel 121 of the first cylinder is connected to the third exhaust port 233 of the third layer, the vent at the upper end of the closed flow channel 122 of the second cylinder is connected to the second exhaust port 232 of the third layer, and the vent at the upper end of the closed flow channel 123 of the third cylinder is connected to the first exhaust port 241 of the fourth layer. In the 3rd gear, the compressed gas in the rodless chambers of the first cylinder, the second cylinder and the third cylinder passes from the lower exhaust port 102 to the outside of the valve sleeve 1; when the 4th gear of the valve core 2 coincides with the reference line 104 of the valve sleeve 1 When line 104 coincides, the vent at the upper end of the closed flow channel 121 of the first cylinder is connected to the fourth exhaust port 234 of the third layer, the vent at the upper end of the closed flow channel 122 of the second cylinder is connected to the third exhaust port 233 of the third layer, the vent at the upper end of the closed flow channel 123 of the third cylinder is connected to the second exhaust port 242 of the fourth layer, and the vent at the upper end of the closed flow channel 124 of the fourth cylinder is connected to the first exhaust port 241 of the fourth layer. In the 4th gear, the compressed gas in the rodless chambers of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder flows from the lower exhaust port 102 to the outside of the valve sleeve 1.

[0067] When the corresponding gear position on the valve core 2 coincides with the reference line 104, compressed gas is introduced into the corresponding rod chamber of the cylinder, pushing the piston 3 to overcome the elastic force of the spring 4 and move upward. At the same time, the corresponding rodless chamber of the cylinder leads to the outside of the valve sleeve 1 through the flow channel, preventing positive pressure from being formed in the rodless chamber of the cylinder when the piston 3 moves upward, thereby causing the tapered plug 7 and the corresponding orifice plate 9 to have a slow response speed or incomplete separation of the water inlet, thereby causing a poor valve opening effect.

[0068] In other embodiments, Fig.13As shown, the third-layer airflow control channel of the valve core 2 is provided with an arc-shaped third-layer inlet channel 230, the starting end of the third-layer inlet channel 230 is at the 0 degree position of the valve core 2, and the third-layer inlet channel 230 extends clockwise, so that the central angle corresponding to the third-layer inlet channel 230 is 60 degrees, and the third-layer inlet channel 230 is connected to the central channel 201 through the gas channel. Fig.14 As shown, an arc-shaped fourth-layer airflow control channel 240 is provided on the fourth-layer airflow control channel of the valve core 2, the starting end of the fourth-layer airflow channel 240 is at the 0 degree position of the valve core 2, and the fourth-layer airflow channel 240 extends clockwise, so that the central angle corresponding to the fourth-layer airflow channel 240 is 180 degrees.

[0069] In 0 gear, Figure 5The third-layer intake channel 230 is connected to the vents at the upper ends of the first cylinder closed channel 121 and the second cylinder closed channel 122, and the fourth-layer intake channel 240 is connected to the vents at the upper ends of the third cylinder closed channel 123 and the fourth cylinder closed channel 124. At this time, the valve is closed, and the compressed air enters the rodless chambers of the four cylinders through the first cylinder closed channel 121, the second cylinder closed channel 122, the third cylinder closed channel 123 and the fourth cylinder closed channel 124. Under the action of the spring 4 and the air pressure, the four cylinders are compressed. The piston 3 is pressed downward to effectively prevent leakage of the fluid; in the first gear, the third-layer intake channel 230 is only connected to the vent at the upper end of the second cylinder closed channel 122, while the vent at the upper end of the first cylinder closed channel 121 is connected to the third-layer first exhaust port 231, and the fourth-layer intake channel 240 is still connected to the vent at the upper end of the third cylinder closed channel 123 and the fourth cylinder closed channel 124. At this time, the piston 3 in the first cylinder rises, and the compressed air passes through the second cylinder closed channel 122 and the third cylinder closed channel 121. 23 and the fourth cylinder closed flow channel 124 enter the rodless chamber in the second cylinder, the third cylinder and the fourth cylinder, and the compressed air in the rodless chamber in the first cylinder is discharged to the outside of the valve sleeve 1 through the first cylinder closed flow channel 121 and the third layer first exhaust port 231; in the second gear, the vent at the upper end of the first cylinder closed flow channel 121 is connected to the third layer second exhaust port 232, the vent at the upper end of the second cylinder closed flow channel 122 is connected to the third layer first exhaust port 231, and the fourth layer intake flow channel 240 is still connected to the third cylinder closed flow channel 123 and The vent at the upper end of the fourth cylinder closed flow channel 124 is connected. At this time, the pistons 3 in the first cylinder and the second cylinder rise, and the compressed air enters the rodless chambers in the third cylinder and the fourth cylinder through the third cylinder closed flow channel 123 and the fourth cylinder closed flow channel 124. The compressed air in the rodless chamber of the first cylinder is discharged to the outside of the valve sleeve 1 through the first cylinder closed flow channel 121 and the third layer second exhaust port 232. The compressed air in the rodless chamber of the second cylinder is discharged to the outside of the valve sleeve 1 through the second cylinder closed flow channel 122 and the third layer first exhaust port 231.In the 3rd gear, the vent at the upper end of the closed flow channel 121 of the first cylinder is connected with the third exhaust port 233 of the third layer, the vent at the upper end of the closed flow channel 122 of the second cylinder is connected with the second exhaust port 232 of the third layer, the intake flow channel 240 of the fourth layer is connected with the closed flow channel 124 of the fourth cylinder, and the vent at the upper end of the closed flow channel 123 of the third cylinder is connected with the first exhaust port 241 of the fourth layer. At this time, the pistons 3 in the first cylinder, the second cylinder and the third cylinder rise, and the compressed air enters the rodless chamber in the fourth cylinder through the closed flow channel 124 of the fourth cylinder, and the compressed air in the rodless chamber of the first cylinder is discharged to the outside of the valve sleeve 1 through the closed flow channel 121 of the first cylinder and the third exhaust port 233 of the third layer. , the compressed air in the rodless chamber of the second cylinder is discharged to the outside of the valve sleeve 1 through the second cylinder closed flow channel 122 and the third layer second exhaust port 232, and the compressed air in the rodless chamber of the third cylinder is discharged to the outside of the valve sleeve 1 through the third cylinder closed flow channel 123 and the fourth layer first exhaust port 241; in the 4th gear, the vent at the upper end of the first cylinder closed flow channel 121 is connected to the third layer fourth exhaust port 234, the vent at the upper end of the second cylinder closed flow channel 122 is connected to the third layer third exhaust port 233, the vent at the upper end of the third cylinder closed flow channel 123 is connected to the fourth layer second exhaust port 242, and the vent at the upper end of the fourth cylinder closed flow channel 124 is connected to the fourth layer first exhaust port 241. ;

[0070] According to the above content, by respectively arranging the third-layer intake flow channel 230 and the fourth-layer intake flow channel 240 on the third-layer airflow control flow channel and the fourth-layer airflow control flow channel of the valve core 2, no matter which gear position it is in, the rodless chamber of the cylinder in the closed state is connected with compressed air, so that the corresponding piston 3 is pressed downward under the action of the spring 4 and the compressed air, effectively preventing the leakage of the fluid, and automatically achieving a good sealing effect through the compressed gas.

[0071] like Fig.10 The valve core 2 is formed into two upper and lower sections with different radial sizes along its axial direction, and is stepped in the axial direction. The first layer of airflow control flow channel and the second layer of airflow control flow channel are located in the upper section of the valve core 2 with a larger radial size, and the third layer of airflow control flow channel and the fourth layer of airflow control flow channel are located in the lower section of the valve core 2 with a smaller radial size; the edge of the bottom surface of the upper section of the valve core 2 is chamfered, such as Fig.15 The chamfered bottom surface of the upper section of the valve core 2 and the inner cavity of the valve sleeve 1 form a second annular cavity, and the second annular cavity leads to the outside of the valve sleeve 1 through the upper exhaust port 103.

[0072] like Fig.11 The first layer of airflow control channel is provided with an arc-shaped first layer of exhaust channel 210, the starting end of the first layer of exhaust channel 210 is at the 300 degree position of the valve core 2, and the first layer of exhaust channel 210 extends counterclockwise, so that the central angle corresponding to the first layer of exhaust channel 210 is 60 degrees; Fig.12The second layer of air flow control channel is provided with an arc-shaped second layer of exhaust flow channel 220, the starting end of the second layer of exhaust flow channel 220 is at a 120 degree position, and the second layer of exhaust flow channel 220 extends counterclockwise, so that the central angle corresponding to the second layer of exhaust flow channel 220 is 120 degrees; the first layer of exhaust flow channel 210 passes through the first axial flow channel 205 (such as Fig.10 ) is connected to the second annular cavity, the first axial flow channel 205 is arranged along the axial direction, and at the 300 degree position of the valve core 2, the second exhaust flow channel 220 passes through the second axial flow channel 206 (such as Fig.15 ) is connected to the second annular cavity, and the second axial flow channel 206 is arranged along the axial direction and at the 120 degree position of the valve core 2.

[0073] When the valve core 2 is in the 4th gear, according to the above, the vent at the upper end of the flow channel 111 opened by the first cylinder coincides with the fourth vent 214 of the first layer, the vent at the upper end of the flow channel 112 opened by the second cylinder coincides with the third vent 213 of the first layer, the vent at the upper end of the flow channel 113 opened by the third cylinder coincides with the second vent 222 of the second layer, and the vent at the upper end of the flow channel 114 opened by the fourth cylinder coincides with the first vent 221 of the second layer, so that compressed air is introduced into the rod chambers of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder, and the valve is in a fully open state. When the gear is adjusted from the 4th gear to the 3rd gear, the rod chambers at the lower ends of the first cylinder, the second cylinder and the third cylinder maintain compressed air. The air makes the piston 3 at the top dead center, and the air vent at the upper end of the fourth cylinder open flow channel 114 is connected to the first axial flow channel 205. In the process of adjusting from the 4th gear to the 3rd gear, the piston 3 in the fourth cylinder moves downward, so that the air in the rod chamber of the fourth cylinder is compressed, and enters the first axial flow channel 205 and the second annular cavity through the fourth cylinder open flow channel 114, and finally leads to the outside of the valve sleeve 1 through the upper exhaust port 103. In this way, when the water inlet of the orifice plate 9 is opened to the closed state, the positive pressure in the rod chamber of the cylinder is avoided to affect the closing effect; when adjusting from the 3rd gear to the 2nd gear, the rod chamber at the lower end of the first cylinder and the second cylinder maintains compressed air to make the piston 3 at the top dead center, and the third The vent at the upper end of the cylinder opening flow channel 113 is connected to the first axial flow channel 205, and the vent at the upper end of the fourth cylinder opening flow channel 114 is connected to the second layer exhaust flow channel 220. In the process of adjusting from the 3rd gear to the 2nd gear, the piston 3 in the fourth cylinder and the third cylinder moves downward, and the compressed gas finally passes through the second annular cavity and the upper exhaust port 103 to the outside of the valve sleeve 1; when adjusting from the 2nd gear to the 1st gear, the rod cavity at the lower end of the second cylinder maintains compressed air to make the piston 3 at the top dead center, and the vent at the upper end of the second cylinder opening flow channel 112 is connected to the first layer exhaust flow channel 210, and the vent at the upper end of the third cylinder opening flow channel 113 and the fourth cylinder opening flow channel 114 is connected to the second layer The exhaust flow channel 220 is connected. In the process of adjusting from the 2nd gear to the 1st gear, the pistons 3 in the fourth cylinder, the third cylinder and the second cylinder move downward, and the compressed gas finally passes through the second annular cavity and the upper exhaust port 103 to the outside of the valve sleeve 1; when adjusting from the 1st gear to the 0th gear, the valve is in a fully closed state, and the air vents at the upper ends of the first cylinder opening flow channel 111 and the second cylinder opening flow channel 112 are connected to the first layer exhaust flow channel 210, and the air vents at the upper ends of the third cylinder opening flow channel 113 and the fourth cylinder opening flow channel 114 are connected to the second layer exhaust flow channel 220. At this time, the rod cavities of the four cylinders are connected to the outside of the valve sleeve 1 through the second annular cavity and the upper exhaust port 103.

[0074] When the flow rate of the valve is adjusted to a small value, the valve is adjusted from a high gear to a low gear, that is, the water inlet of the partially opened orifice plate 9 is changed from an open state to a closed state. At this time, the piston 3 needs to move downward, so that the pressure in the rod chamber of the corresponding cylinder increases, and flows upward through the corresponding open flow channels (the first cylinder open flow channel 111, the second cylinder open flow channel 112, the third cylinder open flow channel 113 and the fourth cylinder open flow channel 114) to the exhaust flow channels (the first layer exhaust flow channel 210 and the second layer exhaust flow channel 220) of the valve core 2, and the compressed air is finally discharged from the second annular cavity and the upper exhaust port 103 to the outside of the valve sleeve 1, so that when the water inlet of the orifice plate 9 is opened to the closed state, the positive pressure is avoided from forming in the rod chamber of the cylinder to affect the closing effect.

[0075] The bottom surface of the upper section of the valve core 2 is provided with a radial groove 207 at the position of 0 degrees and 180 degrees respectively. Fig.15 Six balls 105 that can slide elastically up and down are arranged axially on the surface of the valve sleeve 1 that matches the bottom surface of the upper section of the valve core 2. The corresponding central angle between adjacent balls 105 is 60 degrees. The radial groove 207 matches with the ball 105. When the valve core 2 is rotated to switch between different gears, when it is turned to a certain gear, the radial groove 207 just matches with the corresponding ball 105, which plays a positioning role for the valve core 2 and prevents the valve core 2 from rotating out of place.

[0076] Sealing rings are provided on the outer surface of the valve core 2 at all flow channels and air vents connected to the central flow channel 201 (only the grooves for installing the sealing rings are drawn in the figure, without drawing the sealing rings), while sealing rings are not required at the flow channels and air vents connected to the first annular cavity and the second annular cavity (the first annular cavity and the second annular cavity are used for exhaust and do not require sealing).

[0077] In summary, the present invention can achieve the following functions:

[0078] First, there is no need for an external pneumatic control valve or electronic control system. It only needs to provide compressed air of normal pressure, and pneumatically control the pistons in the four cylinders to move upward and downward, pushing the conical plug 7 to open or close the water inlet on the orifice plate 9, so that the flow of the fluid can be conveniently controlled as needed, playing a role of throttling. The implementation scheme is as follows:

[0079] By arranging the first-layer first air vent 211, the first-layer second air vent 212, the first-layer third air vent 213 and the first-layer fourth air vent 214 on the first-layer air flow control channel of the valve core 2, and arranging the second-layer first air vent 221 and the second-layer second air vent 222 on the second-layer air flow control channel, the first cylinder opening channel 111, the second cylinder opening channel 112, the third cylinder opening channel 113 and the fourth cylinder opening channel 114 are arranged on the valve sleeve 1. When the valve core 2 is rotated, the corresponding air vent is connected with the corresponding opening channel, and compressed air is filled into the rod chamber of the corresponding cylinder barrel to make the piston move upward, thereby opening the water inlet on the corresponding orifice plate 9. In the process of rotating the valve core 2, the 1st gear, 2nd gear, 3rd gear and 4th gear of the valve core 2 correspond to opening 1 water inlet, 2 water inlets, 3 water inlets and 4 water inlets on the orifice plate 9 respectively.

[0080] Second, when the piston 3 in the corresponding cylinder moves upward to open the water inlet through pneumatic control, the rodless chamber of the corresponding cylinder is connected to the outside of the cylinder sleeve, so that the rodless chamber of the cylinder is exhausted, to prevent the formation of positive pressure in the rodless chamber of the cylinder when the piston 3 moves upward, thereby causing the taper plug 7 and the corresponding orifice plate 9 to have a slow response speed or incomplete separation of the water inlet, resulting in a poor opening effect of the valve. The implementation scheme is as follows:

[0081] A third-layer first exhaust port 231, a third-layer second exhaust port 232, a third-layer third exhaust port 233 and a third-layer fourth exhaust port 234 are arranged on the third-layer airflow control channel of the valve core 2, and a fourth-layer first exhaust port 241 and a fourth-layer second exhaust port 242 are arranged on the fourth-layer airflow control channel. The above-mentioned exhaust ports are all connected with the annular channel 202 through the first exhaust channel 203, and exhaust can be achieved from the annular channel 202. The valve sleeve 1 is provided with a first cylinder closed channel 121, a second cylinder closed channel 122, a third cylinder closed channel 123 and a fourth cylinder closed channel 124. When the corresponding gear position on the valve core 2 coincides with the reference line 104, the corresponding exhaust port is connected with the air vent at the upper end of the corresponding closed channel to achieve exhaust.

[0082] Third, no matter which gear is in which position, the rodless chamber of the cylinder in the closed state is connected with compressed air, so that the corresponding piston 3 is pressed downward by the spring 4 and the compressed air, effectively preventing the leakage of the fluid, and automatically achieving a good sealing effect through the compressed gas. The implementation scheme is:

[0083] A third-layer intake channel 230 is arranged on the third-layer airflow control channel of the valve core 2, and a fourth-layer intake channel 240 is arranged on the fourth-layer airflow control channel. The third-layer intake channel 230 and the fourth-layer intake channel 240 are connected with the central channel 201. When shifting gears, the air vents at the upper ends of the first cylinder closed channel 121, the second cylinder closed channel 122, the third cylinder closed channel 123 and the fourth cylinder closed channel 124 are connected with the corresponding airflow channels, and the airflow channels fill the corresponding closed channels with compressed air, thereby pressing the corresponding piston 3 downward.

[0084] Fourth, when the flow rate of the valve is adjusted to a small value, that is, when the valve is adjusted from a high gear to a low gear, the corresponding piston 3 moves downward, and thus the pressure in the rod chamber of the corresponding cylinder increases, and the compressed air is finally discharged from the second annular cavity and the upper exhaust port 103 to the outside of the valve sleeve 1, so that when the water inlet of the orifice plate 9 is opened to the closed state, the positive pressure in the rod chamber of the cylinder is avoided to affect the closing effect. The implementation scheme is:

[0085] A first exhaust channel 210 and a second exhaust channel 220 are provided on the valve core 2. The first exhaust channel 210 and the second exhaust channel 220 are connected with the second annular cavity. When the valve core 2 rotates to different positions, the compressed gas in the rod cavity of the corresponding cylinder barrel flows upward to the corresponding exhaust channel through the open channel (the first cylinder open channel 111, the second cylinder open channel 112, the third cylinder open channel 113 and the fourth cylinder open channel 114), and then is discharged outside the valve sleeve 1.

[0086] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A pneumatic regulating valve, characterized in that: The invention comprises a valve sleeve (1) and a valve core (2) which is sleeved in the upper part of the valve sleeve (1); four cylinders which are evenly distributed along the circumference of the center of the valve sleeve (1) are arranged in the lower part of the inner side of the valve sleeve (1); a piston (3) is mounted on each cylinder so as to slide up and down; a spring (4) is arranged in the cavity at the upper end of the piston (3) in the cylinder; and the lower end of the piston (3) is connected to a conical plug (7) through a piston rod; An upper water outlet sleeve (8) and a lower water inlet sleeve (10) are fixedly mounted at the lower end of the valve sleeve (1); a water baffle (5) is provided between the lower end of the valve sleeve (1) and the upper water outlet sleeve (8); the piston rod passes through the water baffle (5); the piston rod and the water baffle (5) are sealed by a sealing sleeve (6); an orifice plate (9) is provided between the upper water outlet sleeve (8) and the lower water inlet sleeve (10); and four water inlets are provided on the orifice plate (9) corresponding to the conical plugs (7); The valve core (2) is provided with a first layer of airflow control flow channel, a second layer of airflow control flow channel, a third layer of airflow control flow channel and a fourth layer of airflow control flow channel in sequence from top to bottom; the first layer of airflow control flow channel is provided with four first layer of first vents (211), first layer of second vents (212), first layer of third vents (213) and first layer of fourth vents (214) in sequence, which are connected to the central flow channel (201) in the middle of the valve core (2); the first layer of first vents (211), first layer of second vents (212), first layer of third vents (213) and first layer of fourth vents (214) are respectively located at 60 degrees, 120 degrees, 180 degrees and 240 degrees of the valve core (2); The second-layer airflow control channel is provided with two second-layer first vents (221) and second-layer second vents (222) in sequence, which are connected to the central channel (201) in the middle of the valve core (2); the second-layer first vents (221) and second-layer second vents (222) are respectively located at 0 degrees and 60 degrees of the valve core (2); A first cylinder opening flow channel (111), a second cylinder opening flow channel (112), a third cylinder opening flow channel (113) and a fourth cylinder opening flow channel (114) are sequentially arranged on the valve sleeve (1) along its circumference. The first cylinder opening flow channel (111), the second cylinder opening flow channel (112), the third cylinder opening flow channel (113) and the fourth cylinder opening flow channel (114) are respectively located at 0 degrees, 60 degrees, 180 degrees and 240 degrees of the valve sleeve (1). The lower ends of the first cylinder opening flow channel (111), the second cylinder opening flow channel (112), the third cylinder opening flow channel (113) and the fourth cylinder opening flow channel (114) are respectively connected to the rod chambers of the four cylinder barrels in a one-to-one correspondence, and the upper ends of the first cylinder opening flow channel (111), the second cylinder opening flow channel (112), the third cylinder opening flow channel (113) and the fourth cylinder opening flow channel (114) are connected to the inner cavity of the valve sleeve (1) where the valve core (2) is placed; The height positions of the upper ends of the first cylinder opening flow channel (111) and the second cylinder opening flow channel (112) are adapted to the position of the first layer of airflow control flow channel of the valve core (2), and the height positions of the upper ends of the third cylinder opening flow channel (113) and the fourth cylinder opening flow channel (114) are adapted to the position of the second layer of airflow control flow channel of the valve core (2).

2. A pneumatic control valve according to claim 1, characterized in that: A supply flow channel (101) is provided in the middle of the valve sleeve (1), and the supply flow channel (101) comprises an intake flow channel (1011) and an intake connector (1012) which are arranged to interpenetrate each other, wherein the intake flow channel (1011) is arranged along the radial direction of the valve sleeve (1), the outer end of the intake flow channel (1011) leads to the outside of the valve sleeve (1), and the inner end of the intake flow channel (1011) is connected to the intake connector (1012) which is arranged axially.

3. A pneumatic control valve according to claim 2, characterized in that: The third-layer airflow control channel is provided with a third-layer first exhaust port (231), a third-layer second exhaust port (232), a third-layer third exhaust port (233) and a third-layer fourth exhaust port (234) in sequence, and the third-layer first exhaust port (231), the third-layer second exhaust port (232), the third-layer third exhaust port (233) and the third-layer fourth exhaust port (234) are respectively located at 60 degrees, 120 degrees, 180 degrees and 240 degrees of the valve core (2); A fourth-layer first exhaust port (241) and a fourth-layer second exhaust port (242) are sequentially arranged on the fourth-layer airflow control channel, and the fourth-layer first exhaust port (241) and the fourth-layer second exhaust port (242) are respectively located at 60 degrees and 120 degrees of the valve core (2); A first cylinder closed flow channel (121), a second cylinder closed flow channel (122), a third cylinder closed flow channel (123) and a fourth cylinder closed flow channel (124) are sequentially arranged on the valve sleeve (1) along its circumference; the lower ends of the first cylinder closed flow channel (121), the second cylinder closed flow channel (122), the third cylinder closed flow channel (123) and the fourth cylinder closed flow channel (124) are respectively connected to the rodless cavities of the four cylinder barrels in a one-to-one correspondence; the upper ends of the first cylinder closed flow channel (121), the second cylinder closed flow channel (122), the third cylinder closed flow channel (123) and the fourth cylinder closed flow channel (124) are connected to the inner cavity of the valve sleeve (1) where the valve core (2) is placed; The first cylinder closed flow channel (121), the second cylinder closed flow channel (122), the third cylinder closed flow channel (123) and the fourth cylinder closed flow channel (124) are respectively located at 0 degrees, 60 degrees, 120 degrees and 180 degrees of the valve sleeve (1); the height positions of the upper ends of the first cylinder closed flow channel (121) and the second cylinder closed flow channel (122) are adapted to the position of the third layer of the airflow control flow channel of the valve core (2); and the height positions of the upper ends of the third cylinder closed flow channel (123) and the fourth cylinder closed flow channel (124) are adapted to the position of the fourth layer of the airflow control flow channel of the valve core (2).

4. A pneumatic regulating valve as claimed in claim 3, characterized in that: An annular flow channel (202) is provided at the bottom of the valve core (2), the annular flow channel (202) leads to the outside of the valve core (2) through a side outlet flow channel (204), a plurality of first exhaust flow channels (203) are provided inside the valve core (2), and a third-layer first exhaust port (231), a third-layer second exhaust port (232), a third-layer third exhaust port (233), a third-layer fourth exhaust port (234), a fourth-layer first exhaust port (241) and a fourth-layer second exhaust port (242) are all connected to the annular flow channel (202) through the first exhaust flow channel (203); The outer ring of the bottom surface of the valve core (2) is provided with a chamfer, and the chamfer of the bottom surface of the valve core (2) and the inner cavity of the valve sleeve (1) form a first annular cavity, and the first annular cavity leads to the outside of the valve sleeve (1) through the lower exhaust port (102).

5. A pneumatic regulating valve as claimed in claim 2, characterized in that: An arc-shaped third-layer intake channel (230) is provided on the third-layer airflow control channel of the valve core (2), the starting end of the third-layer intake channel (230) is at the 0 degree position of the valve core (2), and the third-layer intake channel (230) extends clockwise, so that the center angle corresponding to the third-layer intake channel (230) is 60 degrees, and the third-layer intake channel (230) is connected to the central channel (201) through the gas channel; an arc-shaped fourth-layer intake channel (240) is provided on the fourth-layer airflow control channel of the valve core (2), the starting end of the fourth-layer intake channel (240) is at the 0 degree position of the valve core (2), and the fourth-layer intake channel (240) extends clockwise, so that the center angle corresponding to the fourth-layer intake channel (240) is 180 degrees.

6. A pneumatic control valve according to claim 2, characterized in that: The valve core (2) is formed into two upper and lower sections with different radial dimensions along its axial direction, so that it is stepped in the axial direction, the first layer of airflow control flow channel and the second layer of airflow control flow channel are located in the upper section of the valve core (2) with a larger radial dimension, and the third layer of airflow control flow channel and the fourth layer of airflow control flow channel are located in the lower section of the valve core (2) with a smaller radial dimension; the edge of the bottom surface of the upper section of the valve core (2) is provided with a chamfer, and the chamfer of the bottom surface of the upper section of the valve core (2) and the inner cavity of the valve sleeve (1) form a second annular cavity, and the second annular cavity leads to the outside of the valve sleeve (1) through the upper exhaust port (103).

7. A pneumatic control valve according to claim 6, characterized in that: The first-layer airflow control channel is provided with an arc-shaped first-layer exhaust channel (210), the starting end of the first-layer exhaust channel (210) is at a 300-degree position of the valve core (2), and the first-layer exhaust channel (210) extends counterclockwise, so that the central angle corresponding to the first-layer exhaust channel (210) is 60 degrees; The second layer of airflow control flow channel is provided with an arc-shaped second layer of exhaust flow channel (220), the starting end of the second layer of exhaust flow channel (220) is at a position of 120 degrees of the valve core (2), and the second layer of exhaust flow channel (220) extends counterclockwise, so that the central angle corresponding to the second layer of exhaust flow channel (220) is 120 degrees; The first-layer exhaust flow channel (210) is connected to the second annular cavity via a first axial flow channel (205), the first axial flow channel (205) is arranged along the axial direction and at a position of 300 degrees of the valve core (2), and the second-layer exhaust flow channel (220) is connected to the second annular cavity via a second axial flow channel (206), the second axial flow channel (206) is arranged along the axial direction and at a position of 120 degrees.

8. A pneumatic regulating valve according to claim 6, characterized in that: The bottom surface of the upper section of the valve core (2) is provided with a radial groove (207) at the position of 0 degrees and 180 degrees respectively. Six balls (105) that can elastically slide up and down are arranged axially on the surface of the valve sleeve (1) that matches the bottom surface of the upper section of the valve core (2). The corresponding central angle between adjacent balls (105) is 60 degrees. The radial groove (207) matches the balls (105).

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