Pilot gulp valve

Abstract

The pilot gulp valve comprises a valve body, a driving piston, a valve plate and a connecting rod, a valve cavity is formed in the valve body, a piston cavity communicated with the valve cavity is formed in one end of the valve body, an air inlet cavity communicated with the valve cavity is formed in the other end of the valve body, the air inlet cavity is communicated with compressed air fluid, and the driving piston is matched in the piston cavity in a sliding and sealing mode. The piston cavity is divided into a driving cavity and a driven cavity by the driving piston, the valve plate is attached to a connecting opening, communicated with the valve cavity, of the air inlet cavity in a sealed mode, the valve plate is tightly attached to the inner wall face of the air inlet cavity through the first spring, and one end of the connecting rod is fixedly connected with the driving piston. By arranging the mutually-linked pilot gulp valves, after pipe blockage occurs in the ash conveying pipe, the pressure behind the blockage point position is larger than the pressure in front of the blockage point position, the pressure on the rear high-pressure side can be automatically distributed to the front low-pressure side, the air pressure on the front side and the rear side of the blockage point position is balanced, and the influence of the pressure difference on the ash conveying pipe is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic ash conveying, and more specifically to a pilot air supply valve. Background Art

[0002] Pneumatic conveying refers to a method of transporting materials over long distances by using airflow to push granular materials forward in a closed pipeline. During pneumatic conveying, the actual flow rate and pressure at various locations in the pipeline are somewhat different from the ideal values. In addition, the materials may be damp or agglomerated, which may cause blockage in the pipeline.

[0003] In the prior art, an automatic air supply valve is generally 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 supply valve detects the pressure increase, it will add compressed air to the conveying pipeline to increase the air pressure and flow rate in the conveying pipeline, push the material forward, and clear the pipeline and avoid blockage.

[0004] In actual use of ash conveying, the reasons for blockage in the conveying pipeline are very complicated. The above-mentioned unblocking method introduces compressed air behind the blockage position. In extreme cases, the compressed air may push the material between the blockage position and the pipe wall, aggravating the blockage. In this case, the difference in air pressure values ​​before and after the blockage position is large, which tests the strength of the ash conveying pipeline. At the same time, the conveying air flow velocity before and after the blockage position 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 which can improve the blockage-clearing effect and avoid the reduction of the overall flow velocity in the ash conveying pipe.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a pilot air supply valve comprises a valve body, a driving piston, a valve plate and a connecting rod, wherein a valve cavity is provided in the valve body, a piston cavity communicating with the valve cavity is provided in one end of the valve body, an air inlet cavity communicating with the valve cavity is provided in the other end of the valve body, the air inlet cavity is in fluid communication with compressed air, the driving piston is slidingly sealed in the piston cavity, the driving piston divides the piston cavity into a driving cavity and a passive cavity, the valve plate is sealingly attached to a connecting port communicating between the air inlet cavity and the valve cavity, the valve plate is tightly attached to an inner wall surface of the air inlet cavity through a first spring, one end of the connecting rod is fixedly connected to the driving piston, 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 in the valve body, one end of the throttling channel is in fluid communication with the air inlet cavity, the other end of the throttling channel is in fluid communication with the valve cavity, and the valve cavity is in fluid communication with an ash conveying pipe through an air delivery channel;

[0007] A pressure storage tank is provided on one side of the valve body, and an air inlet of the pressure storage tank is fluidly connected with the throttling channel through a pipeline, and a one-way valve is installed on the air inlet of the pressure storage tank; an air replenishment control mechanism is installed on one side of the valve body, the air inlet of the air replenishment control mechanism is fluidly connected with the air outlet of the pressure storage tank, and the air outlet of the air replenishment control mechanism is fluidly connected with the driving chamber; an air pressure balance air inlet and an air pressure balance exhaust port are provided on the valve body, and the air pressure balance air inlet and the air pressure balance exhaust port are both fluidly connected with the air outlet of the air transmission channel, the air pressure balance air inlet is fluidly connected with the air inlet control port of the air replenishment control mechanism, the air outlet control port of the air replenishment control mechanism is fluidly connected with the air pressure balance exhaust port of another pilot air replenishment valve, and an air pressure balance control mechanism is installed on the air outlet control port pipeline of the air replenishment control mechanism, and the control port of the air pressure balance control mechanism is fluidly connected with the pressure storage tank.

[0008] The pilot air supply valve has a pressure relief passage in the valve body, one end of the pressure relief passage is in fluid communication with the drive chamber, the other end of the pressure relief passage is in fluid communication with the outside atmosphere, and a pressure relief mechanism is installed in the pressure relief passage.

[0009] The pilot air supply valve has a pressure relief drive mechanism installed in the air delivery channel. The pressure relief drive mechanism and the pressure relief mechanism are in transmission cooperation with each other, and the pressure relief drive mechanism drives the pressure relief mechanism to open or close.

[0010] The above-mentioned pilot air supply valve, the pressure relief drive mechanism includes a support plate, a sleeve, a slide rod and a cone block. A cone hole section is provided in the air transmission channel near the air outlet. The support plate is fixedly installed in the cone hole section. An air vent is provided on the support plate. The sleeve is coaxially fixedly installed at the center position of the support plate. The slide rod is slidably fitted in the sleeve. The cone block is sealingly fitted in the cone hole section. One end of the slide rod is fixedly connected to the cone block. A fourth spring is sleeved on the slide rod. One end of the fourth spring is supported on the cone block, and the other end of the fourth spring is supported on the sleeve.

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

[0012] The above-mentioned pilot air supply valve, the pressure relief mechanism includes a connecting rod, a sealing plate and an elastic sleeve, a sliding hole is opened in the support plate along the horizontal direction, the connecting rod is slidably fitted in the sliding hole, a sealing step is provided in the pressure relief channel, the sealing plate is sealingly fitted on the sealing step to seal the pressure relief channel, one end of the connecting rod is fixedly connected to the sealing plate, the other end of the connecting rod is inserted into the sliding sleeve and abuts on the surface of the sliding rod, the upper part of the connecting rod is fixedly connected with an elastic sleeve, the other end of the elastic sleeve abuts on the valve body, the elastic sleeve pushes the connecting rod so that the connecting rod has a tendency to move in the direction of the sliding rod, and a groove is opened on the sliding rod at a position facing the end of the connecting rod.

[0013] The above-mentioned pilot air supply valve, the air supply control mechanism includes a first outer shell, a first valve core and a second spring, the first valve core is slidingly sealed and fitted in the first outer shell, the first end of the inner wall of the first outer shell is a tapered hole, the first end of the first valve core is a frustum adapted to the tapered hole, the second spring is installed in the first outer shell, and the second spring is arranged between the second end of the first valve core and the first outer shell; the first outer shell is fluidly connected to an air pressure input pipeline at one end of the tapered hole, the air pressure input pipeline is fluidly connected to the air pressure balance air inlet, the side wall of the first outer shell is fluidly connected to an air pressure output pipeline, the frustum section of the first valve core blocks the air pressure output pipeline, and in the ash delivery direction of the ash delivery pipe: the air pressure output pipeline is connected to a pilot air supply pipe in front The air pressure balance exhaust port of the air supply valve is fluid-conducting; a first fluid channel is radially penetrated on the first valve core, and communication ports are respectively opened on both sides of the first outer shell corresponding to the two ends of the first fluid channel, the pressure storage tank is fluid-conducting with the communication port on one side of the first outer shell through a pipeline, and the communication port on the other side of the first outer shell is fluid-conducting with the drive chamber.

[0014] The above-mentioned pilot air supply valve, the air pressure balance control mechanism includes a second outer shell, a second valve core and a third spring, the second valve core is sealingly and slidingly fitted in the second outer shell, a second fluid channel is radially penetrated on the second valve core, and openings corresponding to the second fluid channel are respectively opened on both sides of the second outer shell, the air pressure output pipeline is respectively connected to the opening fluid on the second outer shell, the first end of the second outer shell is connected to the fluid of the pressure storage tank through a pipeline, the third spring is installed in the second end of the second outer shell, one end of the third spring is connected to the second end of the second valve core, and the other end of the third spring is connected to the inside of the second end of the second outer shell.

[0015] In the pilot air supply valve, a limit block is installed inside the second end of the second outer shell, and the limit block is arranged opposite to the second end of the second valve core.

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

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

[0018] 1. By setting up mutually linked pilot air supply valves, when 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, and the pressure on the high-pressure side at the rear can be automatically distributed to the low-pressure side in front, balancing the air pressure on the front and rear sides of the blockage point, and reducing the impact of the pressure difference on the ash conveying pipeline; when the pressure is balanced, a negative pressure flow area can be formed on both sides of the blockage point, promoting the dispersion of materials at the blockage point to both sides; after the rear pressure enters the front side, a forward airflow is formed in front of the blockage point, pushing the material to continue moving forward, continuously delivering the material in front of the pipeline, reducing the accumulated material in front of the blockage point, and facilitating subsequent unblocking.

[0019] 2. After the pressure at the blocking point is balanced, the materials on both sides of the blocking point can be dispersed, especially the materials in front of the blocking point are transported forward, reducing the volume of material accumulation and facilitating unblocking. On this basis, after opening the valve plate, a large amount of compressed air can be quickly input to the rear end of the blocking point, so that pressure can be quickly applied to the blocking point, which plays a role in flushing the blocked materials and achieving unblocking. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0025] Figure 6 Schematic diagram of using conventional automatic air supply valve to dredge the ash conveying pipe;

[0026] Figure 7Schematic diagram of the pilot air supply valve of the present invention clearing the ash conveying pipe.

[0027] The reference numerals in the figure are as follows: 1-valve body; 2-piston chamber; 3-driving piston; 4-intake chamber; 5-valve plate; 6-connecting rod; 7-throttling channel; 8-throttling screw; 9-valve chamber; 10-first spring; 11-air transmission channel; 111-conical hole section; 12-check valve; 13-pressure storage tank; 14-air replenishment control mechanism; 141-first outer shell; 142-sealing chamber; 143-first valve core; 144-first fluid channel; 145-second spring; 146-conduction port; 147-air pressure input pipeline; 148-air pressure output Pipeline; 15-air pressure balance control mechanism; 151-second outer shell; 152-second valve core; 153-second fluid channel; 154-third spring; 155-limiting block; 16-pressure relief drive mechanism; 161-support plate; 162-air vent; 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 channel; 19-air pressure balance air inlet; 20-air pressure balance exhaust. DETAILED DESCRIPTION

[0028] The pilot air supply valve in this embodiment, such as Figure 1 As shown, it includes a valve body 1, a driving piston 3, a valve plate 5 and a connecting rod 6. A valve cavity 9 is opened in the valve body 1. A piston cavity 2 connected to the valve cavity 9 is opened in one end of the valve body 1. An air inlet cavity 4 connected to the valve cavity 9 is opened in the other end of the valve body 1. An air supply channel is provided between the air inlet cavity 4 and the valve cavity 9. The air inlet cavity 4 is fluidly connected to the compressed air. The driving piston 3 is slidingly sealed in the piston cavity 2. The driving piston 3 divides the piston cavity 2 into a driving cavity and a passive cavity. In actual use, a sealing bowl is installed in the driving cavity to prevent impurities from entering the driving cavity with the air and affecting the operation of the driving piston 3. The passive cavity is connected to the outside through the air hole to reduce the running resistance of the driving piston 3. The valve plate 5 is sealed and fitted in the connection between the air inlet cavity 4 and the valve cavity 9. On the connecting port [i.e., the air supply channel], the valve plate 5 is tightly fitted on the inner wall surface of the air inlet chamber 4 through the first spring 10 to block the air supply channel, one end of the connecting rod 6 is fixedly connected to the driving piston 3, 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 arranged 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 opened in the valve body 1, a throttling screw 8 is installed on the throttling channel 7, a first end of the throttling channel 7 is fluidly connected to the air inlet chamber 4, a second end of the throttling channel 7 is fluidly connected to the valve chamber 9, a pressure gauge is also installed on the second end of the throttling channel 7, a gas transmission channel 11 is opened in the valve body 1, and the valve chamber 9 is fluidly connected to the ash conveying pipe through the gas transmission channel 11.

[0029] like Figure 1 As shown, a pressure storage tank 13 is arranged on one side of the valve body 1, and the air inlet of the pressure storage tank 13 is fluidly connected with the throttling channel 7 through a pipeline, and a one-way valve 12 is installed on the air inlet of the pressure storage tank 13. The one-way valve 12 will be opened only under certain pressure conditions, and the air flow can only enter the pressure storage tank 13 through the one-way valve 12, and cannot flow in the reverse direction; an air replenishment control mechanism 14 is installed on one side of the valve body 1, and the air inlet of the air replenishment control mechanism 14 is fluidly connected with the air outlet of the pressure storage tank 13, and the air outlet of the air replenishment control mechanism 14 is fluidly connected with the driving chamber; an air pressure balance air inlet 19 and an air pressure balance exhaust port 20 are arranged on the valve body 1, and the air pressure balance air inlet 19 and the air pressure balance exhaust port 20 are both connected to the air supply passage The fluid is connected at the air outlet of the channel 11, and the air pressure balance air inlet 19 and the air pressure balance exhaust port 20 are arranged near the ash conveying pipe. The two adjacent pilot air supply valves on the ash conveying pipe are marked as A1 and A2 along the ash conveying direction. The air pressure balance air inlet 19 on the rear pilot air supply valve A1 is fluidly connected to the air inlet control port of the air supply control mechanism 14 on the valve, and the air outlet control port of the air supply control mechanism 14 is fluidly connected to the air pressure balance exhaust port 20 on the front pilot air supply valve A2, so as to automatically balance the air pressure difference at both ends of the blockage point. An air pressure balance control mechanism 15 is installed on the pipeline of the air outlet control port of the air supply control mechanism 14, and the control port of the air pressure balance control mechanism 15 is fluidly connected to the pressure storage tank 13.

[0030] like Figure 1 As shown, a pressure relief channel 18 is provided in the valve body 1, one end of the pressure relief channel 18 is in fluid communication with the driving chamber, and the other end of the pressure relief channel 18 is in fluid communication with the outside atmosphere, a pressure relief mechanism 17 is installed in the pressure relief channel 18, 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 in transmission cooperation, and the pressure relief drive mechanism 16 drives the pressure relief mechanism 17 to open or close. By providing the pressure relief mechanism 17 and the pressure relief drive mechanism 16, after the ash conveying pipe is unblocked, when the flow rate in the ash conveying pipe increases rapidly, the compressed air is quickly stopped from being replenished, so that the compressed air can be saved.

[0031] like Figure 4As shown, the pressure relief drive mechanism 16 includes a support plate 161, a sleeve 163, a slide rod 164 and a cone block 165. A cone hole section 111 is provided in the gas transmission channel 11 near the gas outlet. The support plate 161 is fixedly installed in the cone hole section 111. An air vent 162 is provided on the support plate 161. The sleeve 163 is coaxially fixedly installed at the center of the support plate 161. The slide rod 164 is slidably fitted in the sleeve 163. The cone block 165 is sealed and fitted in the cone hole section 111. The cone block 165 is made of rubber. A large diameter end of the cone block 165 is provided with a groove facing away from the axis. The convex edge extends obliquely in the direction, the small diameter end of the cone block 165 is arranged opposite to the valve body 1, and the large diameter end of the cone block 165 is arranged toward the ash conveying pipe, one end of the slide rod 164 is fixedly connected to the cone block 165, and 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 is supported on the sliding sleeve 163. When a large amount of gas in the ash conveying pipe flows into the valve body 1, the convex edge around the large diameter end of the cone block 165 and the fourth spring 166 are used to seal the cone block 165 and the cone hole section 111, so as to prevent backflow. In the process of adding air to the ash conveying pipe to remove the blockage, in the initial stage, the air pressure in the ash conveying pipe increases due to the addition of compressed air, but because it has not been completely unblocked, the air flow is small, and the air flow can only push the cone block 165 to move a part. When the ash conveying pipe is completely unblocked, the pipeline becomes unobstructed, and the gas flows rapidly, so that the amount of compressed air added also increases. As the air flow 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 linkage rod 171, a sealing plate 172 and an elastic sleeve 173. A sliding hole is provided in the support plate 161 in the transverse direction. One end of the sliding hole is communicated with the pressure relief channel 18, and the other end is communicated with the sliding sleeve 163. The linkage 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 on the sealing step to block the pressure relief channel 18. One end of the linkage rod 171 is fixedly connected to the sealing plate 172, and the other end of the linkage rod 171 is inserted into the sliding sleeve 163 and abuts against the surface of the sliding rod 164. The end of the linkage rod 171 is spherical. An elastic sleeve 173 is fixedly connected to the valve body 1, and 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 has a tendency to move toward the sliding rod 164. A groove 174 is provided on the sliding rod 164 at a position toward the end of the connecting rod 171. When the amount of air passing through the gas transmission channel 11 increases, the airflow pushes the cone block 165 to move downward, and synchronously drives the sliding 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, so that the sealing plate 172 is separated from the sealing step, and the pressure relief channel 18 is opened. Figure 1As shown, the pressure in the pressure storage tank 13 and the driving chamber can be quickly released through the pressure relief channel 18, so that the driving piston 3 can be reset, the valve plate 5 is reset synchronously, the air supply channel is cut off, and the air flow in the air delivery channel 11 is restored. Due to the reduction in air flow, the cone block 165 is reset under the action of the fourth spring 166, and the connecting rod 171 is squeezed synchronously, 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 and fitted in the first outer shell 141. The first end of the inner wall of the first outer shell 141 is a tapered hole. The first end of the first valve core 143 is a frustum adapted to the tapered hole. The second spring 145 is installed in the first outer shell 141, and the second spring 145 is arranged between the second end of the first valve core 143 and the first outer shell 141, playing the role of supporting the first valve core 143 and pushing the first valve core 143 to reset; the first outer shell 141 is located at the small diameter end of the tapered hole. The end of the first outer shell 141 is fluid-conductive with an air pressure input pipeline 147, and the air pressure input pipeline 147 is connected to the air pressure The balanced air inlet 19 is fluid-conductive, and a pressure output pipeline 148 is fluid-conductive on the side wall of the first outer shell 141. The frustum section of the first valve core 143 blocks the pressure output pipeline 148. In the ash conveying direction of the ash conveying pipe: the pressure output pipeline 148 is fluid-conductive with the pressure balanced exhaust port 20 of a pilot air supply valve A2 in front; a first fluid channel 144 is radially penetrated on the first valve core 143, and conducting ports 146 are respectively provided on both sides of the first outer shell 141 corresponding to the two ends of the first fluid channel 144. The pressure storage tank 13 is fluid-conductive with the conducting port 146 on one side of the first outer shell 141 through a pipeline, and the conducting port 146 on the other side of the first outer shell 141 is fluid-conductive with the driving 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 sealingly slidably fitted in the second outer shell 151. A second fluid channel 153 is radially penetrated 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 respectively in fluid communication with the openings on the second outer shell 151. The first end of the second outer shell 151 is in fluid communication with the pressure storage tank 13 through a pipeline. The third spring 154 is installed in 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 arranged opposite to the second 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 explanation: Under normal conditions, if Figure 1 As shown, the air supply control mechanism 14 is acted upon by the second spring 145, the first valve core 143 is pressed against the sealing cavity 142, the first fluid channel 144 is connected to the conducting port 146, and the air pressure output pipeline 148 is closed; the air pressure balance control mechanism 15, under the action of the third spring 154, the second valve core 152 is located on the left side, and the second fluid channel 153 cuts off the air pressure output pipeline 148; the first spring 10 pushes the valve plate 5 to fit on the air inlet cavity 4, blocks the air supply channel, and synchronously pushes the connecting rod 6 and the driving piston 3, and the driving piston 3 is in the initial state; the 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 air flow and has a gap between the cone hole section 111 for the air flow to pass through, the elastic force of the fourth spring 166 is relatively small, and it is only necessary to ensure that the cone block 165 can fit slightly with the cone hole section 111 when there is no air flow, so as to ensure the sensitivity of the cone block 165;

[0036] When the ash conveying pipeline is blocked, the pressure in the ash conveying pipeline increases, and the compressed air cannot smoothly enter the ash conveying pipeline through the throttling channel 7. Under the action of the compressed air, the pressure in the throttling channel 7 and the valve cavity 9 increases until the pressure reaches the threshold value. The compressed air overcomes the air intake resistance of the one-way valve 12 and enters the pressure storage tank 13. The pressure in the pressure storage tank 13 increases. Simultaneously, due to the blockage in the ash conveying pipeline, there is a pressure difference between the pilot air supply valve A1 and the pilot air supply valve A2, and the pressure at the rear pilot air supply valve A1 increases. Higher, through the air pressure balance air 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 and the guide port 146 are staggered, thereby blocking the air pressure in the pressure storage tank 13 from acting on the drive cavity, and the air pressure input into the sealed cavity 142 by the air pressure balance air 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 temporarily cannot bypass the blockage position to the pilot Air supply valve A2 delivery;

[0037] When the air pressure in the pressure storage 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 fits the limit block 155. At this time, the second fluid channel 153 is connected to the air pressure output pipeline 148, and the pressure at the pilot air supply valve A1 is transmitted to the pilot air supply valve A2 through the air pressure balance air 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, and enters the front from the air pressure balance exhaust port 20 of the pilot air supply valve A2 until the air pressure balance is performed. Under the action of the high-speed balanced airflow, a negative pressure flow area is formed near both sides of the blocking point, which promotes the dispersion of the blocked material and enables the material in front of the blocking point to be transported forward with the balanced airflow;

[0038] After the air pressure on both sides of the blocking point is balanced, since the air pressure input pipeline 147 cannot provide sufficient pressure, the first valve core 143 moves upward and resets under the action of the second spring 145, 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, and the pressure in the pressure storage tank 13 enters the drive chamber through the pipeline, pushing the drive piston 3, the connecting rod 6 and the valve plate 5 to move to the right, so that the valve plate 5 is separated from the air inlet chamber 4, and the compressed air enters the valve chamber 9 and the air delivery channel 11 through the air supply channel, and is input into the ash delivery pipe, so that the pressure at the blocking point increases rapidly, pushing the blocked material forward. Since the material in front of the blocking point has been partially unblocked, the degree of blockage is reduced, and the unblocking process becomes simpler and faster; since part of the material in the pressure storage tank 13 is unblocked, the degree of blockage is reduced, and the unblocking process becomes simpler and faster. The pressure enters the driving chamber, the pressure in the pressure storage tank 13 decreases, and the second valve core 152 is reset 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 a cut-off state. Since the air has entered the driving chamber, the first valve core 143 will not affect the action of the driving piston 3 even if it moves downward again, because the action of the driving piston 3 has been completed and there is a certain pressure in the driving chamber; the opening pressure of the one-way valve 12, the third spring 154 and the fourth spring 166 are adjusted and replaced according to different preset values ​​to meet different needs. Of course, they can also be replaced with an electronically controlled drive, such as an electromagnetic valve, and a matching pressure detection and control system needs to be installed at the same time;

[0039] When the ash conveying pipe is unblocked, the flow rate increases rapidly, and it becomes easier for compressed air to enter the ash conveying pipe. The airflow at the tapered hole section 111 becomes larger, and the cone block 165 is pushed downward by the airflow until the connecting rod 171 is aligned with the groove 174. The connecting rod 171 moves to the right under the action of the elastic sleeve 173, and the sealing plate 172 opens. The pressure in the drive chamber and the pressure storage tank 13 is released outward, and under the action of the first spring 10, the valve plate 5, the connecting rod 6 and the drive piston 3 are pushed to reset, and each valve returns to its initial state, completing the unblocking.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. Pilot air supply valve, characterized in that: The invention comprises a valve body (1), a driving piston (3), a valve plate (5) and a connecting rod (6); a valve cavity (9) is provided in the valve body (1); a piston cavity (2) communicating with the valve cavity (9) is provided in one end of the valve body (1); an air inlet cavity (4) communicating with the valve cavity (9) is provided in the other end of the valve body (1); the air inlet cavity (4) is communicated with the compressed air fluid; the driving piston (3) is slidingly and sealingly fitted in the piston cavity (2); the driving piston (3) divides the piston cavity (2) into a driving cavity and a passive cavity; the valve plate (5) is sealingly fitted between the air inlet cavity (4) and the passive cavity At the connection port connected to the valve cavity (9), the valve plate (5) is tightly fitted on the inner wall surface of the air inlet cavity (4) through a 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 in fluid communication with the air inlet cavity (4), and the other end of the throttling channel (7) is in fluid communication with the valve cavity (9), and the valve cavity (9) is in fluid communication with the ash conveying pipe through the air delivery channel (11); A pressure storage tank (13) is provided on one side of the valve body (1), and the air inlet of the pressure storage tank (13) is fluidly connected to the throttling channel (7) through a pipeline, and a one-way valve (12) is installed on the air inlet of the pressure storage tank (13); an air replenishment control mechanism (14) is installed on one side of the valve body (1), and the air inlet of the air replenishment control mechanism (14) is fluidly connected to the air outlet of the pressure storage tank (13), and the air outlet of the air replenishment control mechanism (14) is fluidly connected to the driving chamber; an air pressure balance air inlet (19) and an air pressure balance air outlet (20) are provided on the valve body (1), and the air pressure balance air inlet (19) and the air pressure balance air outlet (20) are fluidly connected to the driving chamber; The pressure-balancing air inlet (19) and the pressure-balancing air outlet (20) are both in fluid communication with the air outlet of the air transmission channel (11); the pressure-balancing air inlet (19) is in fluid communication with the air inlet control port of the air replenishment control mechanism (14); the air outlet control port of the air replenishment control mechanism (14) is in fluid communication with the pressure-balancing air outlet (20) of another pilot air replenishment valve; a pressure-balancing control mechanism (15) is installed on the air outlet control port pipeline of the air replenishment control mechanism (14); and the control port of the pressure-balancing control mechanism (15) is in fluid communication with the pressure storage tank (13).

2. The pilot air supply valve according to claim 1, characterized in that: A pressure relief channel (18) is provided in the valve body (1), one end of the pressure relief channel (18) is in fluid communication with the drive chamber, and the other end of the pressure relief channel (18) is in fluid communication with the outside atmosphere, and 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), and the pressure relief drive mechanism (16) and the pressure relief mechanism (17) are in transmission cooperation, and 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) comprises 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 gas transmission channel (11) near the gas 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 in the slide sleeve (163), the cone block (165) is sealingly fitted in the cone hole section (111), one end of the slide rod (164) is fixedly connected to the cone block (165), and a fourth spring (166) is sleeved on the slide rod (164), one end of the fourth spring (166) is supported on the cone block (165), and the other end of the fourth spring (166) is supported on the slide sleeve (163).

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

6. The pilot air supply valve according to claim 4, characterized in that: The pressure relief mechanism (17) comprises a linkage rod (171), a sealing plate (172) and an elastic sleeve (173); a sliding hole is provided in the support plate (161) in a transverse direction; the linkage 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 sealingly fitted on the sealing step to seal the pressure relief channel (18); one end of the linkage rod (171) is fixedly connected to the sealing plate (172); the linkage rod (171) The other end of the connecting rod (171) 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) has a tendency to move toward the sliding rod (164). A groove (174) is provided on the sliding rod (164) at a 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) comprises a first outer shell (141), a first valve core (143) and a second spring (145); the first valve core (143) is slidably sealed and fitted in the first outer shell (141); the first end of the inner wall of the first outer shell (141) is a tapered hole; the first end of the first valve core (143) is a frustum adapted to the tapered hole; the second spring (145) is installed in the first outer shell (141), and the second spring (145) is arranged between the second end of the first valve core (143) and the first outer shell (141); an air pressure input pipeline (147) is fluidly connected to one end of the first outer shell (141) located at the small diameter end of the tapered hole; the air pressure input pipeline (147) is fluidly connected to the air pressure balance inlet (19). The first outer shell (141) has a side wall that is fluid-conductive with an air pressure output pipeline (148), and the conical section of the first valve core (143) blocks the air pressure output pipeline (148). In the ash conveying direction of the ash conveying pipe: the air pressure output pipeline (148) is fluid-conductive with an air pressure balance exhaust port (20) of a pilot air supply valve in front; a first fluid channel (144) is radially penetrated on the first valve core (143), and communication ports (146) are respectively provided on both sides of the first outer shell (141) at the two ends of the first fluid channel (144); the pressure storage tank (13) is fluid-conductive with the communication port (146) on one side of the first outer shell (141) through a pipeline, and the communication port (146) on the other side of the first outer shell (141) is fluid-conductive with the drive chamber.

8. The pilot air supply valve according to claim 7, characterized in that: The air pressure balance control mechanism (15) comprises a second outer shell (151), a second valve core (152) and a third spring (154); the second valve core (152) is sealingly slidably fitted in the second outer shell (151); a second fluid passage (153) is radially penetrated through the second valve core (152); openings corresponding to the second fluid passage (153) are respectively opened on both sides of the second outer shell (151); the air pressure output pipeline (148) is fluidically connected to the openings on the second outer shell (151); the first end of the second outer shell (151) is fluidically connected to the pressure storage tank (13) through a pipeline; the third spring (154) is installed in 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 internally connected to the second end of the second outer shell (151).

9. The pilot air supply valve according to claim 8, characterized in that: A limit block (155) is installed inside the second end of the second outer shell (151), and the limit block (155) is arranged opposite to 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); a sealing ring is provided between the connecting rod (6) and the valve body (1); and a throttling screw (8) is installed on the throttling channel (7).

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