Pilot-operated air supply valve

Abstract

This invention discloses a pilot-operated air supply valve, comprising a valve body, a drive piston, a valve plate, and a connecting rod. The valve body has a valve cavity, one end of which has a piston cavity communicating with the valve cavity, and the other end of which has an air inlet cavity communicating with the valve cavity. The air inlet cavity is in fluid communication with compressed air. The drive piston slides and seals within the piston cavity, dividing the piston cavity into a drive cavity and a passive cavity. The valve plate is sealed against the connection port between the air inlet cavity and the valve cavity, and is tightly fitted to the inner wall of the air inlet cavity by a first spring. One end of the connecting rod is fixedly connected to the drive piston. By setting up interconnected pilot-operated air supply valves, when a blockage occurs in the ash conveying pipe, the pressure behind the blockage point will be greater than the pressure in front of the blockage point. This automatically distributes the pressure from the high-pressure side behind to the low-pressure side in front, balancing the air pressure before and after the blockage point and reducing the impact of the pressure difference on the ash conveying pipeline.

Description

Technical Field

[0001] This invention relates to the field of pneumatic ash conveying technology. Specifically, it relates to a pilot air supply valve. Background Technology

[0002] Pneumatic conveying refers to a method of transporting materials over long distances by using airflow to propel particulate materials forward within a closed pipeline. During pneumatic conveying, the actual flow velocity and pressure at various points within the pipeline may differ from the ideal values. In addition, the materials may be damp or agglomerated, which can cause blockages within the pipeline.

[0003] In existing technologies, an automatic air replenishment valve is typically installed on the conveying pipeline. When a blockage occurs or is about to occur in the pipeline, the air pressure near the blockage location will increase. After the automatic air replenishment valve detects the pressure increase, it replenishes compressed air into the conveying pipeline, thereby increasing the air pressure and flow rate in the pipeline, propelling the material forward, and thus clearing the blockage and preventing further blockage.

[0004] In actual use of ash conveying, the causes of blockages in the conveying pipeline are very complex. The above-mentioned unblocking method involves introducing compressed air behind the blockage location. In extreme cases, the compressed air may push the material between the blockage location and the pipe wall, exacerbating the blockage. In this case, the air pressure difference before and after the blockage location is large, which severely tests the strength of the ash conveying pipeline. At the same time, the airflow velocity of the conveying air before and after the blockage location will decrease, causing the material to settle, which will further increase the difficulty of unblocking. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide a pilot air supply valve that improves the unblocking effect and avoids the reduction of the overall flow velocity in the ash conveying pipe.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pilot-operated air supply valve, comprising a valve body, a driving piston, a valve plate, and a connecting rod. The valve body has a valve cavity, one end of which has a piston cavity communicating with the valve cavity, and the other end of which has an air inlet cavity communicating with the valve cavity. The air inlet cavity is fluidly connected to compressed air. The driving piston is slidably and sealingly fitted within the piston cavity, dividing the piston cavity into a driving cavity and a passive cavity. The valve plate is sealed and fitted against the connection port communicating with the air inlet cavity and the valve cavity. The valve plate is tightly fitted against the inner wall of the air inlet cavity by a first spring. One end of the connecting rod is fixedly connected to the driving piston, and the other end of the connecting rod passes through the valve cavity and is fixedly connected to the valve plate. A throttling channel is provided within the valve body, one end of which is fluidly connected to the air inlet cavity, and the other end of which is fluidly connected to the valve cavity. The valve cavity is fluidly connected to the ash conveying pipe through an air delivery channel.

[0007] A pressure accumulator is located on one side of the valve body. The inlet of the pressure accumulator is fluidly connected to the throttling channel via a pipe, and a one-way valve is installed on the inlet of the pressure accumulator. A replenishment control mechanism is installed on one side of the valve body. The inlet of the replenishment control mechanism is fluidly connected to the outlet of the pressure accumulator, and the outlet of the replenishment control mechanism is fluidly connected to the drive chamber. The valve body is provided with a pressure balance inlet and a pressure balance outlet. Both the pressure balance inlet and the pressure balance outlet are fluidly connected to the outlet of the air delivery channel. The pressure balance inlet is fluidly connected to the inlet control port of the replenishment control mechanism, and the outlet control port of the replenishment control mechanism is connected to another pilot. The air pressure balance exhaust port of the air valve is fluid-conducting, and an air pressure balance control mechanism is installed on the air outlet control port pipeline of the air replenishment control mechanism. The control port of the air pressure balance control mechanism is fluid-conducting with the pressure storage tank.

[0008] The aforementioned pilot air supply valve has a pressure relief channel inside its valve body. One end of the pressure relief channel is in fluid communication with the drive chamber, and the other end is in fluid communication with the outside atmosphere. A pressure relief mechanism is installed inside the pressure relief channel.

[0009] The aforementioned pilot air supply valve has a pressure relief drive mechanism installed in the air supply channel. The pressure relief drive mechanism and the pressure relief mechanism are driven together, and the pressure relief drive mechanism drives the pressure relief mechanism to open or close.

[0010] The aforementioned pilot air supply valve includes a pressure relief drive mechanism comprising a support plate, a sliding sleeve, a sliding rod, and a cone block. A cone hole section is formed in the air supply channel near the air outlet. The support plate is fixedly installed in the cone hole section and has a vent hole. The sliding sleeve is coaxially fixedly installed at the center of the support plate. The sliding rod is slidably fitted in the sliding sleeve. The cone block is sealed in the cone hole section. One end of the sliding rod is fixedly connected to the cone block. A fourth spring is sleeved on the sliding rod. One end of the fourth spring supports the cone block, and the other end of the fourth spring supports the sliding sleeve.

[0011] In the aforementioned pilot air supply valve, the cone is made of rubber, and a raised edge extending obliquely away from the axial direction is provided around the large-diameter end of the cone.

[0012] The aforementioned pilot-operated air supply valve includes a pressure relief mechanism comprising a connecting rod, a sealing plate, and an elastic sleeve. A sliding hole is laterally formed within the support plate, and the connecting rod slidably engages within this hole. A sealing step is provided within the pressure relief channel, and the sealing plate seals the pressure relief channel by sealing against the sealing step. One end of the connecting rod is fixedly connected to the sealing plate, and the other end of the connecting rod passes through the sliding sleeve and abuts against the surface of the sliding rod. An elastic sleeve is fixedly connected to the upper part of the connecting rod, and the other end of the elastic sleeve abuts against the valve body. The elastic sleeve pushes the connecting rod, causing it to tend to move towards the sliding rod. A groove is formed on the sliding rod at a position facing the end of the connecting rod.

[0013] The aforementioned pilot air supply valve, wherein the air supply control mechanism includes a first outer shell, a first valve core, and a second spring. The first valve core is slidably sealed within the first outer shell. The first end of the inner wall of the first outer shell is a tapered hole, and the first end of the first valve core is a frustum adapted to the tapered hole. The second spring is installed within the first outer shell and is positioned between the second end of the first valve core and the first outer shell. A pressure input pipeline is fluid-conducted at one end of the first outer shell located at the small diameter end of the tapered hole. The pressure input pipeline is fluid-conducted with the pressure balance inlet. A pressure output pipeline is fluid-conducted on the side wall of the first outer shell. The frustum section of the first valve core blocks the pressure output pipeline. In the ash conveying direction of the ash conveying pipe: the pressure output pipeline is connected to a pilot air supply valve in front of it. The air valve has a pressure-balanced exhaust port for fluid conduction; a first fluid channel is radially opened on the first valve core, and a conduction port is opened on both sides of the first outer shell corresponding to the two ends of the first fluid channel; the pressure tank is fluidly connected to the conduction port on one side of the first outer shell through a pipe, and the conduction port on the other side of the first outer shell is fluidly connected to the drive cavity.

[0014] The aforementioned pilot air supply valve, wherein the air pressure balance control mechanism includes a second housing, a second valve core, and a third spring, the second valve core being sealed and slidably fitted within the second housing, a second fluid channel being radially penetrated on the second valve core, and openings corresponding to the second fluid channel being respectively opened on both sides of the second housing, the air pressure output pipeline being fluidly connected to the openings on the second housing, the first end of the second housing being fluidly connected to the pressure tank through a pipeline, and the third spring being installed inside the second end of the second housing, one end of the third spring being connected to the second end of the second valve core, and the other end of the third spring being connected to the interior of the second end of the second housing.

[0015] In the aforementioned pilot air supply valve, a limiting block is installed inside the second end of the second housing, and the limiting block is positioned directly opposite the second end of the second valve core.

[0016] The aforementioned pilot air supply valve has a pressure gauge installed on the throttling channel, a sealing ring between the connecting rod and the valve body, and a throttling screw installed on the throttling channel.

[0017] The technical solution of the present invention achieves the following beneficial technical effects:

[0018] 1. By setting up interconnected pilot air supply valves, when a blockage occurs in the ash conveying pipe, the pressure behind the blockage point will be greater than the pressure in front of the blockage point. This automatically distributes the high-pressure side pressure to the low-pressure side, balancing the air pressure before and after the blockage point and reducing the impact of pressure difference on the ash conveying pipe. When the pressure is balanced, a negative pressure flow area can be formed on both sides of the blockage point, promoting the dispersion of material at the blockage point to both sides. After the pressure from the rear enters the front side, a forward airflow is formed in front of the blockage point, pushing the material forward and continuously conveying the material in front of the pipe, reducing the accumulation of material in front of the blockage point, which is beneficial for subsequent unblocking.

[0019] 2. After the pressure at the blockage point is balanced, the material on both sides of the blockage point can be dispersed. In particular, the material in front of the blockage point is conveyed forward, reducing the volume of material accumulation and facilitating unblocking. On this basis, opening the valve plate can quickly and in large quantities input compressed air to the rear of the blockage point, thereby rapidly applying pressure to the blockage point, which can help to break open the blockage material and achieve unblocking. Attached Figure Description

[0020] Figure 1 A schematic cross-sectional view of the pilot air supply valve of the present invention;

[0021] Figure 2 A cross-sectional schematic diagram of the air replenishment control mechanism of the present invention;

[0022] Figure 3 A cross-sectional structural schematic diagram of the air pressure balance control mechanism of the present invention;

[0023] Figure 4 A cross-sectional schematic diagram of the pressure relief drive mechanism and the pressure relief mechanism of the present invention;

[0024] Figure 5 A schematic diagram of the connection between the pilot air supply valve and the ash conveying pipe of the present invention;

[0025] Figure 6 A schematic diagram of using a conventional automatic air replenishment valve to unclog the ash conveying pipe;

[0026] Figure 7A schematic diagram of the pilot air supply valve of this invention clearing the ash conveying pipe.

[0027] The reference numerals in the figure are as follows: 1-valve body; 2-piston chamber; 3-drive piston; 4-inlet chamber; 5-valve plate; 6-connecting rod; 7-throttling channel; 8-throttling screw; 9-valve chamber; 10-first spring; 11-gas delivery channel; 111-conical section; 12-one-way valve; 13-pressure storage tank; 14-gas replenishment control mechanism; 141-first outer shell; 142-sealing cavity; 143-first valve core; 144-first fluid channel; 145-second spring; 146-conductor port; 147-gas pressure input pipeline; 148-gas pressure output. Piping; 15-Pressure balance control mechanism; 151-Second outer casing; 152-Second valve core; 153-Second fluid passage; 154-Third spring; 155-Limit block; 16-Pressure relief drive mechanism; 161-Support plate; 162-Ventilation hole; 163-Sliding sleeve; 164-Sliding rod; 165-Conical block; 166-Fourth spring; 17-Pressure relief mechanism; 171-Linking rod; 172-Sealing plate; 173-Elastic sleeve; 174-Groove; 18-Pressure relief passage; 19-Pressure balance inlet; 20-Pressure balance outlet. Detailed Implementation

[0028] In this embodiment, the pilot air supply valve, such as Figure 1 As shown, the device includes a valve body 1, a drive piston 3, a valve plate 5, and a connecting rod 6. The valve body 1 has a valve chamber 9. One end of the valve body 1 has a piston chamber 2 communicating with the valve chamber 9, and the other end has an air inlet chamber 4 communicating with the valve chamber 9. An air supply channel exists between the air inlet chamber 4 and the valve chamber 9, allowing compressed air to flow through it. The drive piston 3 is slidably sealed within the piston chamber 2, dividing the piston chamber 2 into a drive chamber and a passive chamber. In practical use, a sealing cup is installed in the drive chamber to prevent impurities from entering the drive chamber with the air and affecting the operation of the drive piston 3. The passive chamber communicates with the outside through an air hole, reducing the running resistance of the drive piston 3. The valve plate 5 is sealed against the air inlet chamber 4, which communicates with the valve chamber 9. At the connection port [i.e., the air supply channel], the valve plate 5 is tightly fitted to the inner wall of the air intake chamber 4 by the first spring 10, blocking the air supply channel. One end of the connecting rod 6 is fixedly connected to the drive piston 3, and the other end of the connecting rod 6 passes through the valve chamber 9 and is fixedly connected to the valve plate 5. A sealing ring is provided between the connecting rod 6 and the valve body 1, and the sealing ring is located on the valve body 1 between the valve chamber 9 and the passive chamber. A throttling channel 7 is provided inside the valve body 1, and a throttling screw 8 is installed on the throttling channel 7. The first end of the throttling channel 7 is in fluid communication with the air intake chamber 4, and the second end of the throttling channel 7 is in fluid communication with the valve chamber 9. A pressure gauge is also installed on the second end of the throttling channel 7. An air delivery channel 11 is provided inside the valve body 1, and the valve chamber 9 is in fluid communication with the ash delivery pipe through the air delivery channel 11.

[0029] like Figure 1 As shown, a pressure tank 13 is provided on one side of the valve body 1. The air inlet of the pressure tank 13 is connected to the throttling channel 7 via a pipe. A one-way valve 12 is installed on the air inlet of the pressure tank 13. The one-way valve 12 will only open under certain pressure conditions, and the airflow can only enter the pressure tank 13 through the one-way valve 12 and cannot flow in the reverse direction. A replenishment control mechanism 14 is installed on one side of the valve body 1. The air inlet of the replenishment control mechanism 14 is connected to the air outlet of the pressure tank 13, and the air outlet of the replenishment control mechanism 14 is connected to the drive chamber. A pressure balance air inlet 19 and a pressure balance exhaust port 20 are provided on the valve body 1. Both the pressure balance air inlet 19 and the pressure balance exhaust port 20 are connected to the air supply channel. Fluid flow is conducted at the outlet of channel 11, and the pressure balance inlet 19 and pressure balance outlet 20 are located close to the ash conveying pipe. Two adjacent pilot air supply valves on the ash conveying pipe are marked as A1 and A2 in sequence along the ash conveying direction. The pressure balance inlet 19 on the rear pilot air supply valve A1 is fluidly connected to the air supply control port of the air supply control mechanism 14. The outlet control port of the air supply control mechanism 14 is fluidly connected to the pressure balance outlet 20 on the front pilot air supply valve A2, so as to automatically balance the pressure difference at both ends of the blockage point. A pressure balance control mechanism 15 is installed on the pipeline of the outlet control port of the air supply control mechanism 14. The control port of the pressure balance control mechanism 15 is fluidly connected to the pressure tank 13.

[0030] like Figure 1 As shown, a pressure relief channel 18 is provided inside the valve body 1. One end of the pressure relief channel 18 is connected to the drive chamber for fluid flow, and the other end is connected to the outside atmospheric fluid flow. A pressure relief mechanism 17 is installed inside the pressure relief channel 18, and a pressure relief drive mechanism 16 is installed inside the air delivery channel 11. The pressure relief drive mechanism 16 and the pressure relief mechanism 17 are driven together, and the pressure relief drive mechanism 16 drives the pressure relief mechanism 17 to open or close. By setting up the pressure relief mechanism 17 and the pressure relief drive mechanism 16, when the flow rate in the ash delivery pipe increases rapidly after the pipe is cleared, the supply of compressed air is quickly stopped, which can save compressed air.

[0031] like Figure 4As shown, the pressure relief drive mechanism 16 includes a support plate 161, a sliding sleeve 163, a sliding rod 164, and a cone block 165. A conical section 111 is formed in the air supply channel 11 near the air outlet. The support plate 161 is fixedly installed within the conical section 111, and a vent hole 162 is formed on the support plate 161. The sliding sleeve 163 is coaxially fixedly installed at the center of the support plate 161. The sliding rod 164 is slidably fitted within the sliding sleeve 163. The cone block 165 is sealed within the conical section 111. The cone block 165 is made of rubber, and a groove is provided around the large-diameter end of the cone block 165 that extends away from the axis. The cone 165 has a convex edge that extends in an inclined direction. The small diameter end of the cone 165 is positioned opposite the valve body 1, while the large diameter end of the cone 165 is positioned towards the ash conveying pipe. One end of the slide rod 164 is fixedly connected to the cone 165. A fourth spring 166 is fitted on the slide rod 164. One end of the fourth spring 166 supports the cone 165, and the other end of the fourth spring 166 supports the slide sleeve 163. When a large amount of gas flows into the valve body 1 from the ash conveying pipe, the convex edge around the large diameter end of the cone 165 and the fourth spring 166 are used to seal the cone 165 with the cone hole section 111, thereby preventing backflow. During the process of replenishing air into the ash conveying pipe to clear blockages, in the initial stage, the air pressure in the ash conveying pipe increases due to the replenishment of compressed air. However, since it is not completely cleared, the air flow is small, and the airflow can only push the cone block 165 to move a part. When the ash conveying pipe is completely cleared, the pipeline becomes unobstructed, and the gas flows rapidly, which increases the amount of compressed air replenished. As the airflow increases, the amount of movement of the cone block 165 also increases accordingly.

[0032] like Figure 4 As shown, the pressure relief mechanism 17 includes a connecting rod 171, a sealing plate 172, and an elastic sleeve 173. A sliding hole is transversely formed in the support plate 161. One end of the sliding hole communicates with the pressure relief channel 18, and the other end communicates with the sliding sleeve 163. The connecting rod 171 is slidably fitted in the sliding hole. A sealing step is provided in the pressure relief channel 18. The sealing plate 172 is sealed and fitted onto the sealing step to block the pressure relief channel 18. One end of the connecting rod 171 is fixedly connected to the sealing plate 172, and the other end of the connecting rod 171 passes through the sliding sleeve 163 and abuts against the surface of the sliding rod 164. The end of the connecting rod 171 is spherical. An elastic sleeve 173 is fixedly connected to the upper part of the valve body 1. The other end of the elastic sleeve 173 abuts against the valve body 1. The elastic sleeve 173 pushes the connecting rod 171, causing the connecting rod 171 to tend to move towards the slide rod 164. A groove 174 is provided on the slide rod 164 at the position facing the end of the connecting rod 171. When the air flow through the air supply channel 11 increases, the airflow pushes the cone block 165 downward, synchronously driving the slide rod 164 to move. When the groove 174 is aligned with the end of the connecting rod 171, the connecting rod 171 moves into the groove 174 under the push of the elastic sleeve 173, causing the sealing plate 172 to separate from the sealing step, and the pressure relief channel 18 is opened. Figure 1As shown, the pressure inside the pressure tank 13 and the drive chamber can be quickly released through the pressure relief channel 18, so that the drive piston 3 can be reset and the valve plate 5 can be reset simultaneously, cutting off the gas supply channel and restoring the gas flow in the gas delivery channel 11. Due to the reduction in gas flow, the cone block 165 is reset under the action of the fourth spring 166 and simultaneously squeezes the linkage rod 171, so that the sealing plate 172 fits and seals with the sealing step.

[0033] like Figure 1 As shown, the air replenishment control mechanism 14 includes a first outer shell 141, a first valve core 143, and a second spring 145. The first valve core 143 is slidably sealed within the first outer shell 141. The first end of the inner wall of the first outer shell 141 is a tapered hole, and the first end of the first valve core 143 is a frustum adapted to the tapered hole. The second spring 145 is installed within the first outer shell 141 and is positioned between the second end of the first valve core 143 and the first outer shell 141, serving to support the first valve core 143 and push it to reset. A pressure input pipe 147 is connected to the end of the first outer shell 141 located at the small diameter end of the tapered hole. The pressure input pipe 147 is connected to the air pressure... The balanced air inlet 19 is fluid-conducting, and the side wall of the first outer shell 141 is fluid-conducting with a pressure output pipe 148. The conical section of the first valve core 143 blocks the pressure output pipe 148. In the ash conveying direction of the ash conveying pipe: the pressure output pipe 148 is fluid-conducting with the pressure balanced exhaust port 20 of a pilot air supply valve A2 in front; a first fluid channel 144 is radially opened on the first valve core 143, and a connecting port 146 is opened on both sides of the first outer shell 141 corresponding to the two ends of the first fluid channel 144. The pressure tank 13 is fluid-conducting with the connecting port 146 on one side of the first outer shell 141 through a pipe, and the connecting port 146 on the other side of the first outer shell 141 is fluid-conducting with the drive chamber.

[0034] like Figure 3 As shown, the air pressure balance control mechanism 15 includes a second outer shell 151, a second valve core 152, and a third spring 154. The second valve core 152 is sealed and slidably fitted inside the second outer shell 151. A second fluid channel 153 is radially opened on the second valve core 152. Openings corresponding to the second fluid channel 153 are respectively opened on both sides of the second outer shell 151. The air pressure output pipeline 148 is fluidly connected to the openings on the second outer shell 151. The first end of the second outer shell 151 is fluidly connected to the pressure tank 13 through a pipeline. The third spring 154 is installed inside the second end of the second outer shell 151. One end of the third spring 154 is connected to the second end of the second valve core 152, and the other end of the third spring 154 is connected to the inside of the second end of the second outer shell 151. A limit block 155 is installed inside the second end of the second outer shell 151, and the limit block 155 is set directly opposite the end of the second valve core 152.

[0035] In actual operation, the action time of each component is relatively short. The following is a detailed breakdown: Under normal conditions, such as... Figure 1 As shown, the air replenishment control mechanism 14, under the action of the second spring 145, has the first valve core 143 pressed against the sealing cavity 142, and the first fluid channel 144 connected to the guide port 146, thus sealing the air pressure output pipeline 148; the air pressure balance control mechanism 15, under the action of the third spring 154, has the second valve core 152 positioned on the left, and the second fluid channel 153 cuts off the air pressure output pipeline 148; the first spring 10 pushes the valve plate 5 to adhere to the air inlet cavity 4, blocking the air replenishment channel, and simultaneously pushes the connecting rod 6 and the drive piston 3, which are in their initial state; compressed air enters the valve cavity 9 through the throttling channel 7 and enters the ash conveying pipe through the air delivery channel 11; the cone block 165 is pushed by the airflow, and there is a gap between it and the cone hole section 111 for the airflow to pass through; the elastic force of the fourth spring 166 is small, and it is only necessary to ensure that the cone block 165 can slightly adhere to the cone hole section 111 when there is no airflow, thus ensuring the sensitivity of the cone block 165;

[0036] When a blockage occurs in the ash conveying pipe, the pressure inside the pipe increases. Compressed air cannot smoothly enter the ash conveying pipe through the throttling channel 7. Under the action of the compressed air, the pressure in the throttling channel 7 and valve chamber 9 increases until the pressure reaches the threshold. The compressed air overcomes the inlet resistance of the one-way valve 12 and enters the pressure tank 13, causing the pressure in the pressure tank 13 to increase. Simultaneously, due to the blockage in the ash conveying pipe, a pressure difference exists between the pilot air supply valve A1 and the pilot air supply valve A2. The pressure at the downstream pilot air supply valve A1 is higher, and the flow... Through the air pressure balance inlet 19 and the air pressure input pipeline 147, the air pressure acts on the sealed cavity 142, pushing the first valve core 143 to move downward. The first fluid channel 144 is misaligned with the guide port 146, thereby blocking the air pressure in the pressure tank 13 from acting on the drive cavity. The air pressure input into the sealed cavity 142 through the air pressure balance inlet 19 enters the air pressure output pipeline 148. Under the action of the air pressure balance control mechanism 15, the air pressure output pipeline 148 cannot temporarily deliver the pressure to the pilot air supply valve A2 by bypassing the blockage point.

[0037] When the air pressure in the pressure tank 13 reaches the preset pressure, under the action of air pressure, the second valve core 152 overcomes the elastic force of the third spring 154 and moves to the right until the second valve core 152 is in contact with the limit block 155. At this time, the second fluid channel 153 is connected to the air pressure output pipeline 148. The pressure at the pilot air supply valve A1 is delivered to the pilot air supply valve A2 through the air pressure balance inlet 19, the air pressure input pipeline 147, the air supply control mechanism 14, the air pressure output pipeline 148 and the air pressure balance control mechanism 15. It enters the front of the pilot air supply valve A2 from the air pressure balance exhaust port 20 to perform air pressure balance. Under the action of the high-speed balance airflow, a negative pressure flow area is formed on both sides of the blockage location, which promotes the dispersion of the blocked material and makes the material in front of the blockage location transported forward with the balance airflow.

[0038] After the air pressure on both sides of the blockage point is balanced, the first valve core 143 moves upward and resets under the action of the second spring 145 because the air pressure input pipeline 147 cannot provide sufficient pressure, blocking the air pressure output pipeline 148. At the same time, the first fluid channel 144 and the guide port 146 are aligned and connected. The pressure in the pressure tank 13 enters the drive chamber through the pipeline, pushing the drive piston 3, connecting rod 6 and valve plate 5 to move to the right, causing the valve plate 5 to separate from the air inlet chamber 4. Compressed air enters the valve chamber 9 and the air delivery channel 11 through the air replenishment channel and is input into the ash conveying pipe, causing the pressure at the blockage point to rise rapidly, pushing the blocked material forward. Since the material in front of the blockage point has been partially cleared, the degree of blockage is reduced, and the clearing process becomes simpler and faster. Pressure enters the drive chamber, the pressure in the pressure tank 13 decreases, the second valve core 152 resets under the action of the third spring 154, the pressure in the ash conveying pipe increases under the action of compressed air and will not restart the automatic air pressure balance, that is, the air pressure output pipeline 148 is in the cut-off state. Since the air has entered the drive chamber, even if the first valve core 143 moves downward again, it will not affect the action of the drive piston 3, because the action of the drive piston 3 has been completed and there is a certain pressure in the drive chamber; the opening pressure of the one-way valve 12, the third spring 154 and the fourth spring 166 can be adjusted and replaced according to different preset values ​​to meet different needs. Of course, it can also be replaced with an electric drive, such as a solenoid valve, and a matching pressure detection and control system needs to be installed.

[0039] Once the ash conveying pipe is cleared, the flow rate increases rapidly, making it easier for compressed air to enter the pipe. The airflow at the conical section 111 increases, and the conical block 165 is pushed downward by the airflow until the connecting rod 171 aligns with the groove 174. Under the action of the elastic sleeve 173, the connecting rod 171 moves to the right, the sealing plate 172 opens, and the pressure in the drive chamber and the pressure tank 13 is released outward. Under the action of the first spring 10, the valve plate 5, the connecting rod 6, and the drive piston 3 are pushed back to their original positions, and the clearing is completed.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A pilot-operated air supply valve, characterized in that, The valve body (1) includes a valve body (1), a drive piston (3), a valve plate (5), and a connecting rod (6). The valve body (1) has a valve chamber (9). One end of the valve body (1) has a piston chamber (2) communicating with the valve chamber (9). The other end of the valve body (1) has an air intake chamber (4) communicating with the valve chamber (9). The air intake chamber (4) is connected to compressed air. The drive piston (3) is slidably sealed within the piston chamber (2), dividing the piston chamber (2) into a drive chamber and a passive chamber. The valve plate (5) is sealed against the air intake chamber (4) and the connecting rod (6). At the connection port of the valve cavity (9), the valve plate (5) is tightly attached to the inner wall of the air inlet cavity (4) by the first spring (10). One end of the connecting rod (6) is fixedly connected to the driving piston (3), and the other end of the connecting rod (6) passes through the valve cavity (9) and is fixedly connected to the valve plate (5). A throttling channel (7) is provided in the valve body (1). One end of the throttling channel (7) is fluidly connected to the air inlet cavity (4), and the other end of the throttling channel (7) is fluidly connected to the valve cavity (9). The valve cavity (9) is fluidly connected to the ash conveying pipe through the air conveying channel (11). A pressure tank (13) is provided on one side of the valve body (1). The air inlet of the pressure tank (13) is fluidly connected to the throttling channel (7) through a pipe. A one-way valve (12) is installed on the air inlet of the pressure tank (13). A gas replenishment control mechanism (14) is installed on one side of the valve body (1). The air inlet of the gas replenishment control mechanism (14) is fluidly connected to the air outlet of the pressure tank (13), and the air outlet of the gas replenishment control mechanism (14) is fluidly connected to the drive chamber. A pressure balance air inlet (19) and a pressure balance exhaust port (20) are provided on the valve body (1). The pressure balance inlet (19) and the pressure balance outlet (20) are both fluidly connected to the outlet of the gas supply channel (11). The pressure balance inlet (19) is fluidly connected to the inlet control port of the gas replenishment control mechanism (14). The outlet control port of the gas replenishment control mechanism (14) is fluidly connected to the pressure balance outlet (20) of another pilot gas replenishment valve. A pressure balance control mechanism (15) is installed on the outlet control port pipeline of the gas replenishment control mechanism (14). The control port of the pressure balance control mechanism (15) is fluidly connected to the pressure storage tank (13).

2. The pilot air supply valve according to claim 1, characterized in that, The valve body (1) is provided with a pressure relief channel (18). One end of the pressure relief channel (18) is connected to the drive chamber fluid, and the other end of the pressure relief channel (18) is connected to the outside atmospheric fluid. A pressure relief mechanism (17) is installed in the pressure relief channel (18).

3. The pilot air supply valve according to claim 2, characterized in that, A pressure relief drive mechanism (16) is installed in the gas transmission channel (11). The pressure relief drive mechanism (16) and the pressure relief mechanism (17) are driven together. The pressure relief drive mechanism (16) drives the pressure relief mechanism (17) to open or close.

4. The pilot air supply valve according to claim 3, characterized in that, The pressure relief drive mechanism (16) includes a support plate (161), a sliding sleeve (163), a sliding rod (164), and a cone block (165). A cone hole section (111) is provided in the air supply channel (11) near the air outlet. The support plate (161) is fixedly installed in the cone hole section (111). A vent hole (162) is provided on the support plate (161). The sliding sleeve (163) is coaxially fixedly installed at the center of the support plate (161). The slide rod (164) is slidably fitted inside the slide sleeve (163), and the cone block (165) is sealed inside the cone hole section (111). One end of the slide rod (164) is fixedly connected to the cone block (165). A fourth spring (166) is sleeved on the slide rod (164). One end of the fourth spring (166) supports the cone block (165), and the other end of the fourth spring (166) supports the slide sleeve (163).

5. The pilot air supply valve according to claim 4, characterized in that, The cone (165) is made of rubber, and a raised edge extending obliquely away from the axial direction is provided around the large diameter end of the cone (165).

6. The pilot-operated air supply valve according to claim 4, characterized in that, The pressure relief mechanism (17) includes a connecting rod (171), a sealing plate (172), and an elastic sleeve (173). A sliding hole is provided laterally inside the support plate (161). The connecting rod (171) is slidably fitted within the sliding hole. A sealing step is provided inside the pressure relief channel (18). The sealing plate (172) seals against the sealing step to block the pressure relief channel (18). One end of the connecting rod (171) is fixedly connected to the sealing plate (172). The other end of the sliding rod (164) is inserted into the sliding sleeve (163) and abuts against the surface of the sliding rod (164). An elastic sleeve (173) is fixedly connected to the upper part of the connecting rod (171). The other end of the elastic sleeve (173) abuts against the valve body (1). The elastic sleeve (173) pushes the connecting rod (171) so that the connecting rod (171) tends to move towards the sliding rod (164). A groove (174) is provided on the sliding rod (164) at the position facing the end of the connecting rod (171).

7. The pilot air supply valve according to claim 1, characterized in that, The air replenishment control mechanism (14) includes a first outer shell (141), a first valve core (143), and a second spring (145). The first valve core (143) is slidably sealed within the first outer shell (141). The first end of the inner wall of the first outer shell (141) is a conical hole, and the first end of the first valve core (143) is a frustum adapted to the conical hole. The second spring (145) is installed inside the first outer shell (141) and is located between the second end of the first valve core (143) and the first outer shell (141). A pressure input pipe (147) is fluid-conducted on one end of the first outer shell (141) located at the small diameter end of the conical hole. The pressure input pipe (147) is fluid-conducted with the pressure balance inlet (19). A pressure output pipe (148) is fluid-conducting on the side wall of the first outer shell (141). The conical section of the first valve core (143) blocks the pressure output pipe (148). In the ash conveying direction of the ash conveying pipe: the pressure output pipe (148) is fluid-conducting with the pressure balance exhaust port (20) of a pilot air supply valve in front; a first fluid channel (144) is radially opened on the first valve core (143). A connecting port (146) is opened on both sides of the first outer shell (141) corresponding to the two ends of the first fluid channel (144). The pressure tank (13) is fluid-conducting with the connecting port (146) on one side of the first outer shell (141) through a pipe. The connecting port (146) on the other side of the first outer shell (141) is fluid-conducting with the drive cavity.

8. The pilot air supply valve according to claim 7, characterized in that, The air pressure balance control mechanism (15) includes a second outer shell (151), a second valve core (152), and a third spring (154). The second valve core (152) is sealed and slidably fitted inside the second outer shell (151). A second fluid channel (153) is radially opened on the second valve core (152). Openings corresponding to the second fluid channel (153) are respectively opened on both sides of the second outer shell (151). The air pressure output pipeline (148) is fluidly connected to the openings on the second outer shell (151). The first end of the second outer shell (151) is fluidly connected to the pressure tank (13) through a pipeline. The third spring (154) is installed inside the second end of the second outer shell (151). One end of the third spring (154) is connected to the second end of the second valve core (152), and the other end of the third spring (154) is connected to the inside of the second end of the second outer shell (151).

9. The pilot air supply valve according to claim 8, characterized in that, A limiting block (155) is installed inside the second end of the second outer casing (151), and the limiting block (155) is positioned opposite the second end of the second valve core (152).

10. The pilot air supply valve according to claim 9, characterized in that, A pressure gauge is installed on the throttling channel (7), and a sealing ring is provided between the connecting rod (6) and the valve body (1); a throttling screw (8) is installed on the throttling channel (7).

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