A combined pneumatic control valve

Abstract

This invention relates to the field of control valves, specifically to a combined pneumatic control valve, comprising a valve body and a valve plate; a water passage chamber is provided within the valve body; a partition is provided within the water passage chamber; a vertically aligned connecting hole is provided on the partition; a pneumatic actuator is connected to the upper end of the valve stem; the pneumatic actuator is used to drive the valve plate to move up and down; a sealing mechanism is provided on the side wall of the valve plate; the sealing mechanism includes a flow-blocking component and a sealing component; the flow-blocking component includes a flow-blocking ring and a flow-blocking airbag; after the flow-blocking airbag is inflated and abuts against the sealing wall to block the connecting hole, the sealing component cleans impurities on the corresponding sealing walls on the upper and lower sides of the flow-blocking ring and seals the connecting hole, thus preventing impurities adhering to the sealing wall from affecting the sealing performance when the connecting hole is blocked, thereby affecting the sealing effect when the valve is closed.

Description

Technical Field

[0001] This invention relates to the field of control valves, and more specifically to a combined pneumatic control valve. Background Technology

[0002] Pneumatic control valves are pneumatic components that control and regulate the flow direction, pressure, and flow rate of compressed air. They can be used to form various pneumatic circuits, enabling pneumatic actuators to operate normally according to design requirements. A pneumatic shut-off valve is a type of shut-off valve that uses a cylinder to drive the valve disc to open and close. The valve is closed by the valve disc pressing tightly against a partition seat within the valve body's cavity.

[0003] In the prior art, such as the Chinese patent with announcement number CN116989151B entitled "A Multi-stage Controlled Pneumatic Shut-off Valve", the disclosed technical solution describes that the valve is sealed and closed by inflating the first annular air bladder and tightly adhering to the second annular groove. However, since the fluid passing through the valve carries certain impurities, when these impurities adhere to the sealing surface such as the groove wall of the second annular groove, they affect the sealing effect when the valve is closed. Summary of the Invention

[0004] This invention provides a combined pneumatic control valve to solve the above-mentioned problems.

[0005] The present invention provides a combined pneumatic control valve, comprising a valve body and a valve plate; the valve body has a water passage chamber; a partition is provided within the water passage chamber; the partition divides the water passage chamber into an inlet chamber and an outlet chamber distributed vertically; the inlet chamber is located below the outlet chamber; the partition has a vertically aligned connecting hole; the connecting hole's axis is vertically aligned; the connecting hole connects the inlet chamber and the outlet chamber; the hole wall of the connecting hole is a sealing wall; the valve plate is cylindrical; the valve plate and the connecting hole are coaxially aligned; the valve plate is movably positioned within the outlet chamber; a valve stem is fixedly connected to the upper end of the valve plate; a pneumatic valve is connected to the upper end of the valve stem. A pneumatic actuator is used to drive the valve plate to move up and down. A sealing mechanism is provided on the side wall of the valve plate. When the valve plate is inserted into the connecting hole, the sealing mechanism isolates the inlet chamber and the outlet chamber. The sealing mechanism includes a flow-blocking component and a sealing component. The flow-blocking component includes a flow-blocking ring and a flow-blocking airbag. The flow-blocking ring is coaxially fixed on the side wall of the valve plate. The flow-blocking airbag is annular and coaxially disposed between the flow-blocking ring and the sealing wall. The flow-blocking airbag is fixed on the flow-blocking ring. After the flow-blocking airbag is inflated and abuts against the sealing wall to block the connecting hole, the sealing component cleans the impurities on the corresponding sealing walls on the upper and lower sides of the flow-blocking ring and seals the connecting hole.

[0006] Furthermore, the sealing assembly is located on the upper side of the flow-blocking ring; the sealing assembly includes a receiving groove, a sealing airbag, an auxiliary structure, and a filling and discharging structure; the receiving groove is located on the side wall of the valve plate and is located on the upper side of the flow-blocking ring; the sealing airbag is an L-shaped ring located above the flow-blocking ring; the sealing airbag includes a vertical section and a horizontal section; the vertical section of the sealing airbag is fitted to the side wall of the valve plate; the horizontal section of the sealing airbag is received and sealed in the receiving groove; an annular sealing vent is provided at the intersection of the vertical section and the horizontal section near the valve plate; the sealing vent is located on the side of the receiving groove away from the flow-blocking ring; the sealing airbag is fixedly connected to the valve plate at the sealing vent.

[0007] When the sealing airbag inflates and its vertical section near the sealing wall comes into contact with the sealing wall, the auxiliary structure drives the vertical section of the sealing airbag near the sealing wall to move away from the flow-blocking ring, thus removing impurities from the sealing wall. Simultaneously, the transverse section of the sealing airbag, which is not in contact with the fluid, is pulled out of the receiving groove and placed against the sealed wall after impurities have been removed. This process cleans the impurities from the corresponding sealing walls on both sides of the flow-blocking ring and seals the connecting hole. The inflation / deflation structure is used to control... The system controls the inflation and deflation of air in the intercepting airbag and sealing airbag, as well as the air pressure in the receiving tank. When it is necessary to seal the connecting hole to close the valve, the intercepting airbag is first inflated and expands to abut against the sealing wall to achieve interception. Then, the sealing airbag is inflated. When it is necessary to open the connecting hole to open the valve, a negative pressure is generated in the receiving tank to draw the transverse section of the sealing airbag back into the receiving tank, preventing impurities in the liquid from contaminating the transverse section of the sealing airbag near the side wall of the intercepting ring. Then, the air in the sealing airbag is extracted, and finally, the air in the intercepting airbag is extracted.

[0008] Furthermore, the auxiliary structure includes a movable ring and a drive unit; the movable ring and the valve plate are coaxially arranged; the movable ring is slidably disposed within the vertical section of the sealing airbag and fits against the side wall of the vertical section of the sealing airbag near the valve plate; the drive unit is used to drive the movable ring to move up and down.

[0009] Furthermore, the drive unit is located between the movable ring and the throttling ring; the drive unit includes a magnetic ring and an electromagnetic coil; the electromagnetic coil and the valve plate are coaxial and are built into the throttling ring; the magnetic ring and the electromagnetic coil are coaxial and fixed to the end of the movable ring near the throttling ring; when it is necessary to block the connecting hole, the magnetic poles of the electromagnetic coil and the magnetic ring are the same, so as to drive the movable ring away from the throttling ring, thereby driving the side wall of the vertical section of the sealing airbag near the sealing wall to move away from the throttling ring; when it is necessary to open the connecting hole to open the valve, the magnetic poles of the electromagnetic coil and the magnetic ring are opposite, so as to drive the movable ring near the throttling ring, so that the side wall of the lateral section of the sealing airbag near the throttling ring abuts against the throttling ring, thereby preventing the side wall of the lateral section of the sealing airbag near the throttling ring from being eroded and contaminated by fluid and adhering with impurities.

[0010] Furthermore, the end face of the magnetic ring near the flow-blocking ring is arc-shaped; the end face of the flow-blocking ring near the magnetic ring is provided with a concentric annular mating groove. This increases the contact area between the side wall of the lateral section of the sealing airbag near the flow-blocking ring and the flow-blocking ring, improving the tightness of the contact between the side wall of the lateral section of the sealing airbag near the flow-blocking ring and the flow-blocking ring when the connecting hole connects the inlet and outlet chambers. This reduces the possibility of fluid contact between the portion of the lateral section of the sealing airbag near the flow-blocking ring on the side of the movable ring near the valve plate and the fluid, improving the cleanliness of the portion of the lateral section of the sealing airbag near the flow-blocking ring on the side of the movable ring near the valve plate. Therefore, when sealing the connecting hole, this improves the sealing performance after the portion of the lateral section of the sealing airbag near the flow-blocking ring on the side of the movable ring near the valve plate comes into contact with the sealing wall.

[0011] Furthermore, the filling and discharging structure includes a pipe hole, a collection chamber, a sealing air passage, a choke air passage, and a receiving air passage; the collection chamber is located inside the valve plate; the pipe hole is coaxially located inside the valve stem; the pipe hole and the collection chamber are connected; a vertically oriented connecting hole is provided on the lower wall of the collection chamber; a side chamber is provided on one side of the connecting hole; the side chamber is connected to the collection chamber; the sealing air passage is located inside the valve plate and below the collection chamber; one end of the sealing air passage is connected to the sealing vent, and a sealing disc is provided at the other end; the sealing disc is fixed to... The sealing disc contains a sealing air chamber within the connecting hole; the sealing air chamber and the sealing air passage are connected; a sealing connection port is located at the upper end of the sealing air chamber; a sealing air pipe is connected to the sealing connection port; the sealing air pipe passes through the collection chamber and the pipe distribution hole in sequence and extends to the pneumatic actuator; a receiving air passage is located inside the valve plate and below the sealing air passage; one end of the receiving air passage is connected to the receiving groove, and a receiving tray is located at the other end; the receiving tray is fixed inside the connecting hole and is located below the sealing disc; a space is provided between the receiving tray and the sealing disc. It has a receiving side hole; the receiving side hole connects the part of the connecting hole between the receiving plate and the sealing plate to the side cavity; the receiving plate has a receiving air chamber; the receiving air chamber is connected to the receiving air passage; the upper end of the receiving air chamber has a receiving connection port; a receiving air pipe is connected to the receiving connection port; the receiving air pipe passes through the receiving side hole, the side cavity, the collection chamber and the pipe distribution hole in sequence and extends to the pneumatic actuator; the intercepting air passage is located inside the valve plate and below the receiving air passage; one end of the intercepting air passage is connected to the intercepting air bag, and the other end... A flow-blocking plate is provided; the flow-blocking plate is fixed in the connecting hole and is located below the receiving plate; a flow-blocking side hole is provided between the flow-blocking plate and the receiving plate; the flow-blocking side hole connects the part of the connecting hole between the flow-blocking plate and the receiving plate to the side cavity; a flow-blocking air chamber is provided inside the flow-blocking plate; the flow-blocking air chamber is connected to the flow-blocking air passage; a flow-blocking connection port is provided at the upper end of the flow-blocking air chamber; a flow-blocking air pipe is connected to the flow-blocking connection port; the flow-blocking air pipe passes through the flow-blocking side hole, the side cavity, the collection cavity and the pipe distribution hole in sequence and extends to the pneumatic actuator.

[0012] Furthermore, two sealing components are symmetrically arranged on the upper and lower sides of the flow-blocking ring to improve the sealing effect after flow blocking.

[0013] Furthermore, the vertical section of the sealing airbag has protrusions on the side wall near the sealing wall.

[0014] Furthermore, the active ring is equipped with multiple ventilation holes.

[0015] Furthermore, the pneumatic actuator includes a support housing; the support housing is fixed to the upper end of the valve body; a cylinder is fixed inside the support housing; the piston rod of the cylinder is fixedly connected to the valve rod; a sealing air pump, a throttling air pump, and a receiving air pump are also fixed inside the support housing; the sealing air pump is connected to a sealing air pipe; the throttling air pump is connected to a throttling air pipe; and the receiving air pump is connected to a receiving air pipe.

[0016] The beneficial effects of this invention are: after the throttling airbag is inflated and abuts against the sealing wall to block and cut off the flow through the connecting hole, the sealing assembly cleans the impurities on the sealing walls corresponding to the upper and lower sides of the throttling ring and seals the connecting hole, thus preventing impurities from adhering to the sealing wall and affecting the sealing performance when the connecting hole is blocked, thereby affecting the sealing effect when the valve is closed.

[0017] Furthermore, when the connecting hole needs to be sealed to close the valve, the flow-blocking airbag is first inflated and expands to abut against the sealing wall to achieve flow blocking. Then, the sealing airbag is inflated, and the auxiliary structure drives the vertical section of the sealing airbag near the sealing wall to move away from the flow-blocking ring, thus removing impurities from the sealing wall. At the same time, the horizontal section of the sealing airbag, which is not in contact with the fluid, near the flow-blocking ring, is pulled out of the collection groove and abuts against the sealed wall after the impurities have been removed. When the connecting hole needs to be opened to open the valve, a negative pressure is generated in the collection groove to draw the horizontal section of the sealing airbag back into the collection groove, preventing impurities in the liquid from contaminating the horizontal section of the sealing airbag near the flow-blocking ring. Then, the air in the sealing airbag is extracted, and finally, the air in the flow-blocking airbag is extracted. That is, when closing and opening the valve, the horizontal section of the sealing airbag near the flow-blocking ring, which is in contact with the sealing wall, is always kept clean, improving the sealing effect and service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of a combined pneumatic control valve of the present invention; Figure 2 This is a cross-sectional view of the valve body of an embodiment of the combined pneumatic control valve of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a front view of the valve plate of an embodiment of a combined pneumatic control valve of the present invention; Figure 5 This is a cross-sectional view of the valve plate of an embodiment of a combined pneumatic control valve of the present invention. Figure 6 for Figure 5 Enlarged view of point B in the middle; Figure 7 This is a schematic diagram of the moving ring of an embodiment of a combined pneumatic control valve of the present invention; Figure 8 for Figure 3 Diagram of the inflated state of the central sealing airbag; Figure 9 for Figure 3 State diagram when the active ring is far from the throttling ring.

[0020] In the diagram: 100, valve body; 110, partition plate; 120, connecting hole; 121, sealing wall; 130, inlet chamber; 140, outlet chamber; 200, valve plate; 210, valve stem; 300, pneumatic actuator; 410, throttling ring; 420, throttling airbag; 510, receiving groove; 520, sealing airbag; 521, vertical section; 522, horizontal section; 530, sealing vent; 610, movable ring; 6 21. Magnetic ring; 622. Electromagnetic coil; 710. Pipe hole; 720. Collection chamber; 730. Connection hole; 740. Side chamber; 750. Sealing air passage; 751. Sealing plate; 752. Sealing connection port; 760. Storage air passage; 761. Storage plate; 762. Storage connection port; 763. Storage side hole; 770. Cut-off air passage; 771. Cut-off plate; 772. Cut-off connection port; 773. Cut-off side hole. Detailed Implementation

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] An embodiment of the combined pneumatic control valve of the present invention, such as... Figures 1 to 9The diagram shows a combined pneumatic control valve, comprising a valve body 100 and a valve plate 200. The valve body 100 has a water passage chamber. A partition 110 is provided within the water passage chamber, dividing it into an inlet chamber 130 and an outlet chamber 140, which are distributed vertically. The inlet chamber 130 is located below the outlet chamber 140. The inlet chamber 130 has an inlet, and the outlet chamber 140 has an outlet. A vertically aligned connecting hole 120 is provided on the partition 110, connecting the inlet chamber 130 and the outlet chamber 140. The wall of the connecting hole 120 is a sealing wall 121.

[0023] The valve plate 200 is cylindrical. The valve plate 200 and the connecting hole 120 are coaxially arranged. The valve plate 200 is vertically movable within the outlet chamber 140. A valve stem 210 is fixedly connected to the upper end of the valve plate 200. A pneumatic actuator 300 is connected to the upper end of the valve stem 210. The pneumatic actuator 300 drives the valve plate 200 to move vertically. The pneumatic actuator 300 includes a support housing. The support housing is fixed to the upper end of the valve body 100. A cylinder is fixed inside the support housing. The piston rod of the cylinder is fixedly connected to the valve stem 210. A sealing mechanism is provided on the side wall of the valve plate 200. When the valve plate 200 is inserted into the connecting hole 120, the sealing mechanism isolates the inlet chamber 130 and the outlet chamber 140.

[0024] The sealing mechanism includes a flow-blocking assembly and a sealing assembly. The flow-blocking assembly includes a flow-blocking ring 410 and a flow-blocking airbag 420. The flow-blocking ring 410 is coaxially fixed to the side wall of the valve plate 200. The flow-blocking airbag 420 is annular and coaxially disposed between the flow-blocking ring 410 and the sealing wall 121. The flow-blocking airbag 420 is fixed to the flow-blocking ring 410.

[0025] After the flow-blocking airbag 420 inflates and abuts against the sealing wall 121, sealing the connecting hole 120 and blocking the flow, the sealing assembly cleans impurities from the corresponding sealing walls 121 on both the upper and lower sides of the flow-blocking ring 410 and then seals the connecting hole 120. The sealing assembly is located on the upper side of the flow-blocking ring 410. The sealing assembly includes a receiving groove 510, a sealing airbag 520, auxiliary structures, and an inflation / deflation structure.

[0026] The receiving groove 510 is located on the side wall of the valve plate 200, above the flow-blocking ring 410. The sealing airbag 520 is an L-shaped ring located above the flow-blocking ring 410. The sealing airbag 520 includes a vertical section 521 and a horizontal section 522. The vertical section 521 of the sealing airbag 520 is in contact with the side wall of the valve plate 200. The horizontal section 522 of the sealing airbag 520 is received and sealed within the receiving groove 510. An annular sealing vent 530 is provided at the intersection of the vertical section 521 and the horizontal section 522 near the valve plate 200. The sealing vent 530 is located on the side of the receiving groove 510 away from the flow-blocking ring 410. The sealing airbag 520 is fixedly connected to the valve plate 200 at the sealing vent 530.

[0027] When the sealing airbag 520 inflates and its vertical section 521 comes into contact with the side wall of the sealing wall 121, the auxiliary structure drives the side wall of the vertical section 521 of the sealing airbag 520 near the sealing wall 121 to move away from the flow-blocking ring 410, thereby removing impurities from the sealing wall 121. Simultaneously, the transverse section 522 of the sealing airbag 520, which is not in contact with the fluid, is pulled out of the receiving groove 510 from its side wall near the flow-blocking ring 410 and placed against the sealed wall 121 after the impurities have been removed. This achieves the sealing of the connecting hole 120 after cleaning the impurities from the corresponding sealing walls 121 on both the upper and lower sides of the flow-blocking ring 410. The auxiliary structure includes a movable ring 610 and a drive unit. The movable ring 610 and the valve plate 200 are coaxially arranged. The movable ring 610 is slidably disposed within the vertical section 521 of the sealing airbag 520 and is in contact with the side wall of the vertical section 521 of the sealing airbag 520 near the valve plate 200. The movable ring 610 is provided with multiple vent holes.

[0028] The drive unit is used to move the movable ring 610 up and down. The drive unit is located between the movable ring 610 and the throttling ring 410. The drive unit includes a magnetic ring 621 and an electromagnetic coil 622. The electromagnetic coil 622 is coaxial with the valve plate 200 and is built into the throttling ring 410. The magnetic ring 621 and the electromagnetic coil 622 are coaxial and fixed to the end of the movable ring 610 near the throttling ring 410. When it is necessary to block the connecting hole 120, the magnetic poles of the electromagnetic coil 622 and the magnetic ring 621 are the same, so as to drive the movable ring 610 away from the throttling ring 410, thereby driving the vertical section 521 of the sealing airbag 520 near the side wall of the sealing wall 121 to move away from the throttling ring 410. When it is necessary to open the connecting hole 120 to open the valve, the magnetic poles of the electromagnetic coil 622 and the magnetic ring 621 are opposite, so as to drive the movable ring 610 near the throttling ring 410, so that the lateral section 522 of the sealing airbag 520 near the side wall of the throttling ring 410 abuts against the throttling ring 410, thereby preventing the lateral section 522 of the sealing airbag 520 near the side wall of the throttling ring 410 from being eroded and contaminated by fluid and adhering with impurities.

[0029] The end face of the magnetic ring 621 near the throttling ring 410 is arc-shaped. The end face of the throttling ring 410 near the magnetic ring 621 is provided with an annular mating groove concentric with the magnetic ring 621. By increasing the contact area between the side wall of the transverse section 522 of the sealing airbag 520 near the intercepting ring 410 and the intercepting ring 410, the tightness of the contact between the side wall of the transverse section 522 of the sealing airbag 520 near the intercepting ring 410 and the intercepting ring 410 is improved when the connecting hole 120 connects the inlet chamber 130 and the outlet chamber 140. This reduces the possibility of the portion of the side wall of the transverse section 522 of the sealing airbag 520 near the intercepting ring 410 on the side of the movable ring 610 near the valve plate 200 coming into contact with the fluid, and improves the cleanliness of the portion of the side wall of the transverse section 522 of the sealing airbag 520 near the intercepting ring 410 on the side of the movable ring 610 near the valve plate 200. As a result, when the connecting hole 120 is blocked, the sealing performance after the portion of the side wall of the transverse section 522 of the sealing airbag 520 near the intercepting ring 410 on the side of the movable ring 610 near the valve plate 200 comes into contact with the sealing wall 121 is improved.

[0030] The inflation / deflation structure is used to control the inflation and deflation of air in the intercepting airbag 420 and the sealing airbag 520, as well as to control the air pressure in the receiving tank 510. When it is necessary to seal the connecting hole 120 to close the valve, the intercepting airbag 420 is first inflated and expands to abut against the sealing wall 121 to achieve interception. Then, the sealing airbag 520 is inflated. When it is necessary to open the connecting hole 120 to open the valve, a negative pressure is generated in the receiving tank 510 to draw the transverse section 522 of the sealing airbag 520 back into the receiving tank 510, preventing impurities in the liquid from contaminating the transverse section 522 of the sealing airbag 520 near the side wall of the intercepting ring 410. Then, the air in the sealing airbag 520 is extracted, and finally, the air in the intercepting airbag 420 is extracted.

[0031] The filling and discharging structure includes a pipe hole 710, a collection chamber 720, a sealing air passage 750, a choke air passage 770, and a receiving air passage 760. The collection chamber 720 is located within the valve plate 200. The pipe hole 710 is coaxially located within the valve stem 210. The pipe hole 710 and the collection chamber 720 are connected. A vertically oriented connecting hole 730 is provided on the lower wall of the collection chamber 720. A side chamber 740 is provided on one side of the connecting hole 730. The side chamber 740 is connected to the collection chamber 720.

[0032] A sealing air passage 750 is located within the valve plate 200 and below the collection chamber 720. One end of the sealing air passage 750 is connected to the sealing vent 530, and the other end is equipped with a sealing disc 751. The sealing disc 751 is fixed within the connection hole 730. A sealing air chamber is provided within the sealing disc 751. The sealing air chamber is connected to the sealing air passage 750. A sealing connection port 752 is provided at the upper end of the sealing air chamber. A sealing air pipe is connected to the sealing connection port 752. The sealing air pipe passes sequentially through the collection chamber 720 and the pipe distribution hole 710, extending to the pneumatic actuator 300.

[0033] A receiving air passage 760 is located within the valve plate 200 and below the sealing air passage 750. One end of the receiving air passage 760 communicates with the receiving groove 510, and the other end is provided with a receiving tray 761. The receiving tray 761 is fixed within the connecting hole 730 and is located below the sealing tray 751. A receiving side hole 763 is provided between the receiving tray 761 and the sealing tray 751. The receiving side hole 763 communicates with the portion of the connecting hole 730 between the receiving tray 761 and the sealing tray 751 and the side cavity 740. A receiving air chamber is provided within the receiving tray 761. The receiving air chamber communicates with the receiving air passage 760. A receiving connection port 762 is provided at the upper end of the receiving air chamber. A receiving air pipe is connected to the receiving connection port 762. The receiving air tube passes sequentially through the receiving side hole 763, the side cavity 740, the collection cavity 720 and the pipe laying hole 710, extending to the pneumatic actuator 300.

[0034] A flow-blocking air passage 770 is located within the valve plate 200 and below the receiving air passage 760. One end of the flow-blocking air passage 770 is connected to the flow-blocking airbag 420, and the other end is equipped with a flow-blocking plate 771. The flow-blocking plate 771 is fixed within the connecting hole 730 and is located below the receiving plate 761. A flow-blocking side hole 773 is provided between the flow-blocking plate 771 and the receiving plate 761. The flow-blocking side hole 773 connects the portion of the connecting hole 730 between the flow-blocking plate 771 and the receiving plate 761 to the side cavity 740. A flow-blocking air chamber is provided within the flow-blocking plate 771. The flow-blocking air chamber is connected to the flow-blocking air passage 770. A flow-blocking connection port 772 is provided at the upper end of the flow-blocking air chamber. A flow-blocking air pipe is connected to the flow-blocking connection port 772. The intercepting air pipe passes sequentially through the intercepting side hole 773, side cavity 740, collection cavity 720, and pipe distribution hole 710, extending to the pneumatic actuator 300. A sealing air pump, an intercepting air pump, and a receiving air pump are also fixed inside the support housing; the sealing air pump is connected to the sealing air pipe. The intercepting air pump is connected to the intercepting air pipe. The receiving air pump is connected to the receiving air pipe.

[0035] In this embodiment, two sealing components are symmetrically arranged on the upper and lower sides of the flow-blocking ring 410 to improve the sealing effect after flow blocking. The vertical section 521 of the sealing airbag 520 has protrusions on the side wall near the sealing wall 121 to increase the roughness of the side wall near the sealing wall 121 and improve the cleaning effect on the sealing wall 121.

[0036] Based on the above embodiments, the operating principle and process of this invention are as follows: When it is necessary to seal the connecting hole 120 to close the valve, the pneumatic actuator 300 drives the valve plate 200 to move down into the connecting hole 120. The flow-blocking air pump first inflates the flow-blocking airbag 420 to abut against the sealing wall 121 to achieve flow blocking. Then, the sealing air pump inflates the sealing airbag 520, causing the sealing airbag 520 to expand and abut against the side wall of the sealing wall 121 near the sealing airbag 520. Then, the receiving air pump controls the air pressure in the receiving groove 510 to be equal to the atmospheric pressure. Then, by controlling the direction of the current within the electromagnetic coil 622, the magnetic poles of the electromagnetic coil 622 are controlled so that the magnetic poles of the electromagnetic coil 622 and the magnetic ring 621 are the same. This drives the movable ring 610 away from the flow-blocking ring 410, thereby driving the vertical section 521 of the sealing airbag 520, near the side wall of the sealing wall 121, away from the flow-blocking ring 410 to remove impurities from the sealing wall 121. Simultaneously, the lateral section 522 of the sealing airbag 520, which is not in contact with the fluid, is pulled out of the receiving groove 510 from the side wall of the flow-blocking ring 410 and attached to the sealing wall 121 after the impurities have been removed. Finally, the air pressure inside the sealing airbag 520 is further increased, increasing the pressure between the sealing airbag 520 and the sealing wall 121. At the same time, the pressure inside the receiving groove 510 is further increased, achieving double pressurization and improving the sealing performance.

[0037] When it is necessary to open the connecting hole 120 to open the valve, the current of the electromagnetic coil 622 is gradually reduced to decrease the repulsive force between the electromagnetic coil 622 and the magnetic ring 621. When the repulsive force is reduced to zero, the direction of the current is changed so that the magnetic poles of the electromagnetic coil 622 and the magnetic ring 621 are opposite, forming an attractive force that drives the movable ring 610 closer to the intercepting ring 410. Then, the receiving air pump creates a negative pressure in the receiving tank 510 to draw the transverse section 522 of the sealing airbag 520 back into the receiving tank 510, preventing impurities in the liquid from contaminating the transverse section 522 of the sealing airbag 520 near the side wall of the intercepting ring 410. Then, the sealing air pump extracts the air from the sealing airbag 520, causing the vertical section 521 of the sealing airbag 520 to move away from the side wall of the sealing wall 121. Then, the intercepting air pump extracts air from the intercepting airbag 420, causing the intercepting airbag 420 to separate from the sealing wall 121, allowing fluid to enter the outlet chamber 140 from the inlet chamber 130 through the connecting hole 120. During the fluid's passage through the connecting hole 120, the sealing air pump performs multiple short bursts of inflation and deflation on the sealing airbag 520. Through the impact of the fluid and the expansion and compression of the sealing airbag 520, impurities adhering to the side wall of the vertical section 521 of the sealing airbag 520 near the sealing wall 121 are flushed away with the fluid. Finally, the pneumatic actuator 300 drives the valve plate 200 to move upwards away from the connecting hole 120.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined pneumatic control valve, characterized in that: It includes a valve body and a valve plate; the valve body has a water passage chamber; the water passage chamber has a partition; the partition divides the water passage chamber into an inlet chamber and an outlet chamber distributed vertically; the inlet chamber is located below the outlet chamber; the partition has a vertically oriented connecting hole; the connecting hole's axis is vertically oriented; the connecting hole connects the inlet chamber and the outlet chamber; the hole wall of the connecting hole is a sealing wall; The valve plate is cylindrical; the valve plate and the connecting hole are coaxially arranged; the valve plate is movably positioned in the outlet chamber; a valve stem is fixedly connected to the upper end of the valve plate; a pneumatic actuator is connected to the upper end of the valve stem; the pneumatic actuator is used to drive the valve plate to move up and down; a sealing mechanism is provided on the side wall of the valve plate. The sealing mechanism includes a flow-blocking component and a sealing component; the flow-blocking component includes a flow-blocking ring and a flow-blocking airbag; the flow-blocking ring is coaxially fixed on the side wall of the valve plate; the flow-blocking airbag is annular and coaxially disposed between the flow-blocking ring and the sealing wall; the flow-blocking airbag is fixed on the flow-blocking ring; after the flow-blocking airbag is inflated and abuts against the sealing wall to block the connecting hole, the sealing component cleans the impurities on the corresponding sealing walls on the upper and lower sides of the flow-blocking ring and then seals the connecting hole; The sealing assembly is located on the upper side of the flow-blocking ring; the sealing assembly includes a receiving groove, a sealing airbag, an auxiliary structure, and a filling and discharging structure. The receiving groove is located on the side wall of the valve plate and above the flow-stopping ring; The sealing airbag is an L-shaped ring positioned above the flow-blocking ring. The sealing airbag includes a vertical section and a horizontal section. The vertical section of the sealing airbag is fitted to the side wall of the valve plate. The horizontal section of the sealing airbag is housed and sealed within a receiving groove. An annular sealing vent is located at the intersection of the vertical and horizontal sections near the valve plate. The sealing vent is located on the side of the receiving groove furthest from the flow-blocking ring. The sealing airbag is fixedly connected to the valve plate at the sealing vent. When the sealing airbag inflates and the vertical section of the sealing airbag comes into contact with the sealing wall, the auxiliary structure drives the vertical section of the sealing airbag to move away from the sealing wall away from the flow-blocking ring to remove impurities from the sealing wall. At the same time, the horizontal section of the sealing airbag that is not in contact with the fluid in the receiving groove is pulled out from the receiving groove and attached to the sealing wall after the impurities are removed. This achieves the sealing of the connecting hole after cleaning the impurities on the corresponding sealing walls on the upper and lower sides of the flow-blocking ring. The inflation / deflation structure is used to control the inflation and deflation of air in the choke airbag and the sealing airbag, as well as to control the air pressure in the storage tank.

2. The combined pneumatic control valve according to claim 1, characterized in that: The auxiliary structure includes a movable ring and a drive unit; the movable ring and the valve plate are coaxially arranged; the movable ring is slidably disposed in the vertical section of the sealing airbag and fits against the side wall of the vertical section of the sealing airbag near the valve plate. The drive unit is used to move the movable ring up and down.

3. A combined pneumatic control valve according to claim 2, characterized in that: The drive unit is located between the moving ring and the throttling ring; the drive unit includes a magnetic ring and an electromagnetic coil; the electromagnetic coil and the valve plate are coaxial and are built into the throttling ring; the magnetic ring and the electromagnetic coil are coaxial and fixed to the end of the moving ring near the throttling ring; when it is necessary to block the connecting hole, the magnetic poles of the electromagnetic coil and the magnetic poles of the magnetic ring are the same, and when it is necessary to open the connecting hole to open the valve, the magnetic poles of the electromagnetic coil and the magnetic poles of the magnetic ring are opposite.

4. A combined pneumatic control valve according to claim 3, characterized in that: The end face of the magnetic ring near the throttling ring is arc-shaped; the end face of the throttling ring near the magnetic ring is provided with a concentric annular groove.

5. A combined pneumatic control valve according to claim 4, characterized in that: The filling and discharging structure includes a pipe hole, a collection chamber, a sealing air passage, a choke air passage, and a receiving air passage; the collection chamber is located inside the valve plate; the pipe hole is coaxially located inside the valve stem; the pipe hole and the collection chamber are connected; the lower cavity wall of the collection chamber is provided with a vertically oriented connecting hole; a side cavity is provided on one side of the connecting hole; The side cavity and the main cavity are connected; The sealing air passage is located inside the valve plate and below the collection chamber; one end of the sealing air passage is connected to the sealing vent, and the other end is provided with a sealing plate; the sealing plate is fixed in the connection hole; a sealing air chamber is provided inside the sealing plate; the sealing air chamber is connected to the sealing air passage; a sealing connection port is provided at the upper end of the sealing air chamber; a sealing air pipe is connected to the sealing connection port. The sealed air tube passes sequentially through the collection chamber and the pipe distribution hole, extending to the pneumatic actuator. The gas collection channel is located inside the valve plate and below the sealing gas channel. One end of the gas collection channel is connected to the collection groove, and the other end is equipped with a collection tray. The collection tray is fixed in the connection hole and is located below the sealing tray. A side hole for collection is provided between the collection tray and the sealing tray. The side hole for collection connects the part of the connection hole between the collection tray and the sealing tray to the side cavity. A gas collection chamber is provided inside the collection tray. The gas collection chamber is connected to the gas collection channel. A gas collection connection port is provided at the upper end of the gas collection chamber. A gas collection tube is connected to the gas collection connection port. The receiving air tube passes sequentially through the receiving side hole, side cavity, collection cavity and tube distribution hole to the pneumatic actuator; The intercepting air passage is located inside the valve plate and below the receiving air passage; one end of the intercepting air passage is connected to the intercepting air bag, and the other end is equipped with an intercepting plate; the intercepting plate is fixed in the connecting hole and is located below the receiving plate; an intercepting side hole is provided between the intercepting plate and the receiving plate; the intercepting side hole connects the part of the connecting hole between the intercepting plate and the receiving plate to the side cavity; an intercepting air chamber is provided inside the intercepting plate; the intercepting air chamber is connected to the intercepting air passage; an intercepting connection port is provided at the upper end of the intercepting air chamber; an intercepting air pipe is connected to the intercepting connection port; the intercepting air pipe passes through the intercepting side hole, the side cavity, the collection cavity, and the pipe distribution hole in sequence and extends to the pneumatic actuator.

6. A combined pneumatic control valve according to claim 5, characterized in that: Two sealing assemblies are provided symmetrically on the upper and lower sides of the flow-blocking ring.

7. A combined pneumatic control valve according to claim 6, characterized in that: The vertical section of the sealing airbag has protrusions on the side wall near the sealing wall.

8. A combined pneumatic control valve according to claim 5, characterized in that: The movable ring has multiple ventilation holes.

9. A combined pneumatic control valve according to claim 6, characterized in that: The pneumatic actuator includes a support housing; the support housing is fixed to the upper end of the valve body; a cylinder is fixed inside the support housing; the piston rod of the cylinder is fixedly connected to the valve rod; a sealing air pump, a throttling air pump, and a receiving air pump are also fixed inside the support housing; the sealing air pump is connected to the sealing air pipe; the throttling air pump is connected to the throttling air pipe; and the receiving air pump is connected to the receiving air pipe.

Images