CN114249127B - Pilot pneumatic conveying double-safety check valve - Google Patents
Pilot pneumatic conveying double-safety check valve Download PDFInfo
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- CN114249127B CN114249127B CN202210117497.XA CN202210117497A CN114249127B CN 114249127 B CN114249127 B CN 114249127B CN 202210117497 A CN202210117497 A CN 202210117497A CN 114249127 B CN114249127 B CN 114249127B
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 68
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 abstract description 36
- 239000000463 material Substances 0.000 abstract description 13
- 238000005507 spraying Methods 0.000 description 14
- 238000004140 cleaning Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/52—Adaptations of pipes or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
- B65G2201/042—Granular material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a pilot pneumatic conveying double-safety check valve, which comprises an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are fixedly connected through a connecting flange, an air inlet pipe is arranged on the top wall of the upper valve body in a penetrating manner, an air inlet switch valve and a switch protection valve are arranged in the air inlet pipe, and the switch protection valve is positioned at the bottom of the air inlet switch valve; according to the invention, the bottom cover is arranged at the top end of the air outlet pipe, the top cover is arranged above the bottom cover, when the air supply of the material conveying system is stopped, air in the material conveying pipeline can carry dust to flow back to the inside of the check valve through the air outlet pipe, when the dust passes through the bottom cover, the dust can be obliquely blown to the inner surface of the top cover through the radian of the bottom cover, and then the dust can move outwards along the radian of the inner surface of the top cover under the action of air flow, so that the dust falls to the bottom of the lower valve body, and the dust can be effectively prevented from being scattered and blown to the inside of the whole check valve.
Description
Technical Field
The invention relates to the technical field of pneumatic material conveying. In particular to a pilot pneumatic conveying double-safety check valve.
Background
Pneumatic conveying, also called air conveying, is to utilize the energy of air flow to convey granular material in the air flow direction in a closed pipeline, and is one specific application of fluidization technology.
In the pneumatic conveying system, a special check valve for conveying pneumatic materials is commonly used for preventing dust particles carried by air flow from flowing back into an air supply pipeline, however, in practical application, because the working condition environment of the pneumatic material conveying system is very severe, the check valve is often leaked, closed inaccurately, ash blocking and the like, particularly when air supply is stopped, the air pressure of the air supply pipeline is reduced, and the check valve cannot completely ensure that the dust particles are prevented from flowing back; and because the check valve is of a closed design, the dust in the check valve is very troublesome to clean.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the pilot pneumatic conveying double-safety check valve which can block dust for a plurality of times and can automatically clean dust in the check valve.
In order to solve the technical problems, the invention provides the following technical scheme:
the pilot pneumatic conveying double-safety check valve comprises an upper valve body and a lower valve body, wherein the upper valve body is fixedly connected with the lower valve body through a connecting flange, an air inlet pipe is arranged on the top wall of the upper valve body in a penetrating manner, an air inlet switch valve and a switch protection valve are arranged in the air inlet pipe, the switch protection valve is positioned at the bottom of the air inlet switch valve, and the air inlet switch valve is connected with the switch protection valve through a connecting rod; the inner part of the upper valve body is fixedly provided with a gas spraying ring close to the bottom, the gas spraying ring is provided with gas spraying holes, and the inner part of the lower valve body is fixedly provided with a filter screen close to the top; an air outlet pipe is arranged on the bottom wall of the lower valve body in a penetrating manner, a bottom cover is fixedly arranged at the top end of the air outlet pipe, a lifting frame is fixedly arranged on the lower surface of the filter screen, a top cover is fixedly arranged at the bottom of the lifting frame, and the top cover is positioned right above the bottom cover; the bottom wall of the lower valve body is fixedly provided with a collecting assembly which is communicated with the lower valve body; the air inlet pipe is in fluid communication with the external air supply main pipe, and the air outlet pipe is in fluid communication with the external conveying pipe.
The pilot pneumatic conveying double-safety check valve is characterized in that an abutting groove is formed in the top of the air inlet pipe, the air inlet switch valve comprises an inner sleeve, an abutting ring is fixedly arranged at the top end of the outer surface of the inner sleeve, and the inner sleeve is arranged in the air inlet pipe through the matching of the abutting groove and the abutting ring; the inner sleeve is characterized in that a necking pipe is coaxially arranged in the inner sleeve, a supporting ring plate is fixedly arranged in the inner sleeve, the supporting ring plate is positioned below the inner sleeve, the upper surface of the supporting ring plate is fixedly connected with the bottom end of a return spring, the top end of the return spring is fixedly connected with the lower surface of a first sealing plate, the diameter of the first sealing plate is larger than the inner diameter of the inner sleeve, a sealing ring is coaxially arranged on the upper surface of the first sealing plate, a ring groove matched with the sealing ring is formed in the lower surface of the inner sleeve, the sealing ring is positioned in the ring groove, two or more limiting rods are fixedly arranged on the upper surface of the sealing ring, limiting holes matched with the limiting rods are formed in the inner sleeve, and the limiting rods are positioned in the limiting holes; the upper surface coaxial mounting of first closing plate has the second closing plate, the diameter of second closing plate is less than the internal diameter of endotheca pipe, just the diameter of second closing plate is greater than the internal diameter of necking down pipe, the upper surface coaxial mounting of second closing plate has the sealing plug, the diameter of sealing plug equals the internal diameter of necking down pipe, necking down pipe with the surface of sealing plug is smooth design, works as the lower surface of first closing plate with when the upper surface contact of support ring board, the top of restriction pole still is located in the restriction hole.
The pilot pneumatic conveying double-safety check valve comprises a threaded ring, wherein threads matched with the threaded ring are arranged on the inner surface of the air inlet pipe close to the bottom, and the threaded ring is arranged on the inner part of the air inlet pipe close to the bottom in a threaded manner; the upper surface of the threaded ring is coaxially provided with a fixed cover, the fixed cover is made of hard materials such as steel, and two or more vent holes are formed in the fixed cover in a penetrating manner; the inside of fixed cover is provided with the rubber cover, the surface of rubber cover is hugged closely the internal surface of fixed cover, the upper surface of rubber cover with the bottom fixed connection of connecting rod, the top of connecting rod passes the roof of fixed cover with the mesopore of support ring board with the lower surface fixed connection of first closing plate.
The pilot pneumatic conveying double-safety check valve is characterized in that the air injection ring is coaxially arranged on the inner wall of the upper valve body and close to the bottom, the air injection hole vertically penetrates through the bottom wall of the air injection ring, the air injection hole also obliquely penetrates through the side wall of the air injection ring, and the air outlet of the air injection hole obliquely faces the filter screen; the side wall of the upper valve body is fixedly provided with a pilot valve, an air outlet of the pilot valve penetrates through the side wall of the upper valve body and the side wall of the air injection ring to extend into the air injection ring, and an air inlet of the pilot valve is in fluid conduction with an air inlet main pipe through a pipeline.
The top end of the air outlet pipe and the bottom end of the bottom cover are flush with the inner surface of the bottom wall of the lower valve body, and the bottom cover is a table-shaped pipe with gradually smaller diameter from bottom to top; the top cover is a hemispherical arc plate, and the outer surface of the top cover is fixedly connected with the bottom end of the lifting frame; the outer surface fixed mounting of bottom cover has first annular plate, first annular plate is the platform venturi tube that becomes smaller gradually from bottom to top diameter, the interior surface fixed mounting of top cover has the second annular plate, the second annular plate is the platform venturi tube that becomes larger gradually from bottom to top diameter, first annular plate with the crisscross distribution of second annular plate.
The collecting assembly comprises a collecting ring, a collecting pipe and a sealing cover; the collecting ring is coaxially and penetratingly arranged on the bottom wall of the lower valve body, and the top end of the collecting ring is flush with the inner wall of the lower valve body; the top end of the collecting pipe is fixedly connected with the lower surface of the collecting ring, the collecting pipe is communicated with the inner cavity of the collecting ring, and the number of the collecting pipes is two or more; the sealing cover is arranged at the bottom end of the collecting pipe in a threaded manner.
The technical scheme of the invention has the following beneficial technical effects:
1. according to the invention, the bottom cover is arranged at the top end of the air outlet pipe, the top cover is arranged above the bottom cover, when the air supply of the material conveying system is stopped, air in the material conveying pipeline can carry dust to flow back to the inside of the check valve through the air outlet pipe, when the dust passes through the bottom cover, the dust can be obliquely blown to the inner surface of the top cover through the radian of the bottom cover, and then the dust can move outwards along the radian of the inner surface of the top cover under the action of air flow, so that the dust falls to the bottom of the lower valve body, the dust can be effectively prevented from being scattered and blown to the inside of the whole check valve, the subsequent collection and cleaning of the dust are facilitated, and the upper surface of the top cover is arc-shaped, so that the dust falling from the upper part can not fall into the air outlet pipe and the material conveying pipeline can be blocked; the first annular plates on the outer surface of the bottom cover and the second annular plates on the inner surface of the top cover are distributed in a staggered mode, and therefore the dust at the bottom of the lower valve body can be prevented from being blown into the air outlet pipe to seal the air outlet pipe and the conveying pipe.
2. According to the invention, the filter screen and the jet ring are arranged, the pilot valve is arranged on the jet ring, when excessive dust particles are deposited on the filter screen to influence the normal air supply of the material conveying system, the pressure in the upper valve body can be increased, the pilot valve is further induced to inflate the jet ring, the air in the jet ring can jet the air on the filter screen through the vertical jet holes at the bottom of the jet ring and the jet holes inclined at the side edges of the jet ring, and the filter screen is reversely flushed, so that the effect of automatically cleaning the filter screen is achieved.
3. According to the invention, the inner sleeve and the necking pipe are arranged in the air inlet pipe, and the first sealing plate, the second sealing plate and the sealing plug with sealing rings are arranged at the bottoms of the inner sleeve and the necking pipe, so that the backflow of gas is blocked under the action of the reset spring; wherein through set up a plurality of restriction poles of inserting interior sleeve pipe on the sealing ring, can form certain restriction effect to first closing plate, second closing plate and sealing plug, can make two closing plates and a sealing plug can match with interior sleeve pipe and necking down pipe when resetting, and then reach better sealed effect.
4. According to the invention, the fixed cover is arranged in the necking pipe, the rubber cover is arranged in the fixed cover, the top of the rubber cover is connected with the bottom of the first sealing plate through the connecting rod, and during normal air intake, the air inlet switch valve is opened under the action of air flow, so that the first sealing plate can push the rubber cover downwards through the connecting rod to separate the rubber cover from the fixed cover, and further, the air flow can smoothly enter the check valve through the air hole, when the air supply of the conveying system is stopped, the air inlet switch valve is restored to the original position, and the first sealing plate can pull the rubber cover to be attached to the fixed cover through the connecting rod to seal the air hole, so that the air flow can be prevented from flowing back through the air hole; the switch protection valve is arranged in the air outlet direction of the air inlet switch valve, so that dust can be prevented from depositing in a gap inside the air inlet switch valve, the high opening or closing sensitivity of the air inlet switch valve is ensured, and the service life is long; through making air inlet switch valve and switch protection valve pass through the connecting rod linkage, replace traditional extrusion formula and ventilate, not only can make the resistance of admitting air less to even rubber cover ageing or accumulation dust leads to sealing inadequately between rubber cover and the fixed cover, but can reach the gas volume of carrying dust of air inlet switch valve very little, very little to the influence of air inlet switch valve.
5. According to the invention, the collecting ring is arranged at the bottom of the lower valve body in a communicated manner, and the collecting pipes are arranged at the bottom of the collecting ring in a communicated manner, so that dust falls into the collecting ring when falling into the bottom of the lower valve body, and then falls into the collecting pipes, and after a certain time, the dust in the check valve can be cleaned only by opening the sealing cover, so that the traditional method for disassembling and cleaning the check valve is replaced, and the cleaning process is more convenient; and the filter screen is automatically cleaned by combining the air spraying ring and the pilot valve, so that the service time of the device is greatly prolonged.
6. According to the invention, the rubber cover is connected with the first sealing plate, and when the material conveying system supplies air and stops supplying air, the rubber cover can be driven to move simultaneously through the up-down movement of the first sealing plate, compared with the mode that the rubber cover and the fixed cover are relatively fixed, the rubber cover moves relatively along the axial direction along with the opening and closing of the air inlet switch valve, so that dust adhered to the contact surface between the fixed cover and the rubber cover can be removed when the rubber cover is contacted with and separated from the fixed cover, and the dropped dust can fall along a gap between the rubber cover and the fixed cover, so that the problem that the tightness between the rubber cover and the fixed cover is reduced due to the fact that dust is adhered to the contact surface between the fixed cover and the rubber cover under the condition of long-time use can be avoided.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is an enlarged schematic view of the structure of FIG. 1A according to the present invention;
FIG. 3 is a schematic view of a part of the structure of an intake switch valve of the present invention;
FIG. 4 is a schematic view of the structure of the support ring plate of the present invention;
fig. 5 is an enlarged schematic view of the structure of fig. 1B according to the present invention.
The reference numerals in the drawings are as follows: 1-an upper valve body; 2-a lower valve body; 3-connecting flanges; 4-an air inlet pipe; 5-an air inlet switch valve; 6-switching a protective valve; 7-connecting rods; 8-spraying ring; 9-gas injection holes; 10-filtering net; 11-an air outlet pipe; 12-a bottom cover; 13-lifting and hanging frames; 14-a top cover; 15-a collection assembly; 16-an abutment groove; 17-inner sleeve; 18-an abutment ring; 19-necking tube; 20-supporting ring plates; 21-a return spring; 22-a first sealing plate; 23-sealing rings; 24-restraining bar; 25-a second sealing plate; 26-sealing plug; 27-a threaded ring; 28-a fixed cover; 29-vent holes; 30-a rubber cover; 31-pilot valve; 32-a first ring plate; 33-a second ring plate; 34-a collection ring; 35-collecting pipe; 36-sealing cover.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The pilot pneumatic conveying double-safety check valve comprises an upper valve body 1 and a lower valve body 2, wherein the upper valve body 1 and the lower valve body 2 are fixedly connected through a connecting flange 3, an air inlet pipe 4 is arranged on the top wall of the upper valve body 1 in a penetrating mode, an air inlet switch valve 5 and a switch protection valve 6 are arranged in the air inlet pipe 4, the switch protection valve 6 is located at the bottom of the air inlet switch valve 5, and the air inlet switch valve 5 is connected with the switch protection valve 6 through a connecting rod 7; the inner part of the upper valve body 1 is fixedly provided with a gas spraying ring 8 near the bottom, the gas spraying ring 8 is provided with a gas spraying hole 9, and the inner part of the lower valve body 2 is fixedly provided with a filter screen 10 near the top; the bottom wall of the lower valve body is provided with an air outlet pipe 11 in a penetrating manner, the top end of the air outlet pipe 11 is fixedly provided with a bottom cover 12, the lower surface of the filter screen 10 is fixedly provided with a lifting frame 13, the bottom of the lifting frame 13 is fixedly provided with a top cover 14, and the top cover 14 is positioned right above the bottom cover 12; a collecting assembly 15 is fixedly arranged on the bottom wall of the lower valve body 2, and the collecting assembly 15 is communicated with the lower valve body 2; the air inlet pipe 4 is in fluid communication with an external air supply main pipe, and the air outlet pipe 11 is in fluid communication with an external conveying pipe.
As shown in fig. 2-4, the top of the air inlet pipe 4 is provided with an abutting groove 16, the air inlet switch valve 5 comprises an inner sleeve 17, the top end of the outer surface of the inner sleeve 17 is fixedly provided with an abutting ring 18, and the inner sleeve 17 is arranged in the air inlet pipe 4 through the matching of the abutting groove 16 and the abutting ring 18; the inside of the inner sleeve 17 is coaxially provided with a necking pipe 19, the inside of the air inlet pipe is fixedly provided with a supporting ring plate 20, the supporting ring plate 20 is positioned below the inner sleeve 17, the upper surface of the supporting ring plate 20 is fixedly connected with the bottom end of a return spring 21, the top end of the return spring 21 is fixedly connected with the lower surface of a first sealing plate 22, the diameter of the first sealing plate 22 is larger than the inner diameter of the inner sleeve 17, the upper surface of the first sealing plate 22 is coaxially provided with a sealing ring 23, the lower surface of the inner sleeve 17 is provided with a ring groove matched with the sealing ring 23, the sealing ring 23 is positioned in the ring groove, the upper surface of the sealing ring 23 is fixedly provided with two or more limiting rods 24, the inside of the inner sleeve 17 is provided with limiting holes matched with the limiting rods 24, and the limiting rods 24 are positioned in the limiting holes; the upper surface of the first sealing plate 22 is coaxially provided with a second sealing plate 25, the diameter of the second sealing plate 25 is smaller than the inner diameter of the inner sleeve 17, the diameter of the second sealing plate 25 is larger than the inner diameter of the necking pipe 19, the upper surface of the second sealing plate 25 is coaxially provided with a sealing plug 26, the diameter of the sealing plug 26 is equal to the inner diameter of the necking pipe 19, the outer surfaces of the necking pipe 19 and the sealing plug 26 are both smooth, and when the lower surface of the first sealing plate 22 is in contact with the upper surface of the supporting ring plate 20, the top end of the limiting rod 24 is still positioned in the limiting hole; the switch protection valve 6 comprises a threaded ring 27, threads matched with the threaded ring 27 are arranged on the inner surface of the air inlet pipe 4 close to the bottom, and the threaded ring 27 is arranged on the inner part of the air inlet pipe 4 close to the bottom in a threaded manner; the upper surface of the threaded ring 27 is coaxially provided with a fixed cover 28, the fixed cover 28 is made of hard materials such as steel, and two or more vent holes 29 are formed in the fixed cover 28 in a penetrating manner; the inside of fixed cover 28 is provided with rubber cover 30, and the internal surface of fixed cover 28 is hugged closely to the surface of rubber cover 30, and the upper surface of rubber cover 30 and the bottom fixed connection of connecting rod 7, the top of connecting rod 7 pass the roof of fixed cover 28 and the mesopore of support ring board 20 and the lower surface fixed connection of first closing plate 22.
As shown in fig. 1 and 5, the air spraying ring 8 is coaxially installed on the inner wall of the upper valve body 1 at a position close to the bottom, the air spraying holes 9 vertically penetrate through the bottom wall of the air spraying ring 8, the air spraying holes 9 also obliquely penetrate through the side wall of the air spraying ring 8, and the air outlets of the air spraying holes 9 obliquely face the filter screen 10; the side wall of the upper valve body 1 is fixedly provided with a pilot valve 31, an air outlet of the pilot valve 31 penetrates through the side wall of the upper valve body 1 and the side wall of the air injection ring 8 to extend into the air injection ring 8, and an air inlet of the pilot valve 31 is in fluid communication with an air inlet main pipe through a pipeline.
As shown in fig. 1, the top end of the air outlet pipe 11 and the bottom end of the bottom cover 12 are flush with the inner surface of the bottom wall of the lower valve body 2, and the bottom cover 12 is a table-shaped pipe with gradually smaller diameter from bottom to top; the top cover 14 is a hemispherical arc plate, and the outer surface of the top cover 14 is fixedly connected with the bottom end of the lifting frame 13; the outer surface of the bottom cover 12 is fixedly provided with a first annular plate 32, the first annular plate 32 is a table-shaped pipe with the diameter gradually reduced from bottom to top, the inner surface of the top cover 14 is fixedly provided with a second annular plate 33, the second annular plate 33 is a table-shaped pipe with the diameter gradually increased from bottom to top, and the first annular plate 32 and the second annular plate 33 are distributed in a staggered manner; the collection assembly 15 includes a collection ring 34, a collection tube 35, and a seal cap 36; the collecting ring 34 is coaxially and penetratingly arranged on the bottom wall of the lower valve body 2, and the top end of the collecting ring 34 is flush with the inner wall of the lower valve body 2; the top end of the collecting pipe 35 is fixedly connected with the lower surface of the collecting ring 34, the collecting pipe 35 is communicated with the inner cavity of the collecting ring 34, and the number of the collecting pipes 35 is two or more; the sealing cap 36 is screw-mounted at the bottom end of the collecting pipe 35.
Working principle: the air inlet pipe 4 of the device is connected with an external air supply main pipe, the air outlet pipe 11 is connected with an external conveying pipeline, under the normal air supply state, air enters the necking pipe 19 from the external air supply main pipe, the first sealing plate 22, the second sealing plate 25 and the sealing plug 26 are pressed down under the pressure action of the air, the air flow enters the air inlet pipe 4 through an opened gap, the rubber cover 30 is pressed down through the connecting rod 7 in the pressing down process of the first sealing plate 22, the outer surface of the rubber cover 30 is separated from the inner surface of the fixed cover 28, the air flows into the upper valve body 1 and the lower valve body 2 through the gaps between the air vent 29 and the fixed cover 28 and the rubber cover 30, and further air enters the external conveying pipeline from the air outlet pipe 11 through the filter screen 10 and the bottom cover 12; when the air supply is stopped, under the action of pressure, the air inlet switch valve 5 is closed again, and under the action of a plurality of limiting rods 24, the first sealing plate 22, the second sealing plate 25, the sealing plug 26 and the sealing ring 23 are just returned to the original positions, and the first sealing plate 22 also pulls the rubber cover 30 to rise through the connecting rod 7 so as to seal the vent hole 29 again; in addition, the air flow can carry dust into the check valve through the air outlet pipe 11 under the action of air pressure in the material conveying pipeline, and when the dust passes through the bottom cover 12, the dust can be obliquely blown away to the inner surface of the top cover 14 due to the radian of the bottom cover 12 and falls to the bottom of the lower valve body 2 along the radian of the inner surface of the top cover 14, and then falls into the collecting pipe 35 through the collecting ring 25; when the air current continues to flow upwards, the dust can be filtered by filter screen 10, deposit the dust and too much and need the air feed again on filter screen 10, the pressure in the upper valve body 1 can increase, and then be sensed by pilot valve 31, and then aerify in to jet-propelled ring 8, gas sweeps filter screen 10 from a plurality of positions through jet-propelled hole 8, and then the cooperation is admitted air and is cleared up filter screen 10, the speed of cleaning is accelerated, the radian of top cover 14 upper surface is passed through to the dust that drops from filter screen 10, can drop to in collecting pipe 35, after a certain time, open sealed lid 36 clear up the dust in the collecting pipe 35 can.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While the obvious variations or modifications which are extended therefrom remain within the scope of the claims of this patent application.
Claims (5)
1. The pilot pneumatic conveying double-safety check valve comprises an upper valve body (1) and a lower valve body (2), wherein the upper valve body (1) and the lower valve body (2) are fixedly connected through a connecting flange (3), and is characterized in that an air inlet pipe (4) is arranged on the top wall of the upper valve body (1) in a penetrating manner, an air inlet switch valve (5) and a switch protection valve (6) are arranged in the air inlet pipe (4), the switch protection valve (6) is positioned at the bottom of the air inlet switch valve (5), and the air inlet switch valve (5) is connected with the switch protection valve (6) through a connecting rod (7); the inner part of the upper valve body (1) is fixedly provided with an air injection ring (8) close to the bottom, the air injection ring (8) is provided with air injection holes (9), and the inner part of the lower valve body (2) is fixedly provided with a filter screen (10) close to the top; an air outlet pipe (11) is arranged on the bottom wall of the lower valve body in a penetrating manner, a bottom cover (12) is fixedly arranged at the top end of the air outlet pipe (11), a lifting frame (13) is fixedly arranged on the lower surface of the filter screen (10), a top cover (14) is fixedly arranged at the bottom of the lifting frame (13), and the top cover (14) is positioned right above the bottom cover (12); a collecting assembly (15) is fixedly arranged on the bottom wall of the lower valve body (2), and the collecting assembly (15) is communicated with the lower valve body (2);
the air injection ring (8) is coaxially arranged at a position, close to the bottom, on the inner wall of the upper valve body (1), the air injection hole (9) vertically penetrates through the bottom wall of the air injection ring (8), the air injection hole (9) also obliquely penetrates through the side wall of the air injection ring (8), and an air outlet of the air injection hole (9) obliquely faces the filter screen (10); the side wall of the upper valve body (1) is fixedly provided with a pilot valve (31), an air outlet of the pilot valve (31) penetrates through the side wall of the upper valve body (1) and the side wall of the air injection ring (8) to extend into the air injection ring (8), and an air inlet of the pilot valve (31) is in fluid conduction with an air inlet main pipe through a pipeline.
2. The pilot pneumatic conveying double-safety check valve according to claim 1, wherein an abutting groove (16) is formed in the top of the air inlet pipe (4), the air inlet switch valve (5) comprises an inner sleeve (17), an abutting ring (18) is fixedly arranged at the top end of the outer surface of the inner sleeve (17), and the inner sleeve (17) is arranged in the air inlet pipe (4) through the matching of the abutting groove (16) and the abutting ring (18); the inner sleeve (17) is internally and coaxially provided with a necking pipe (19), the inner part of the air inlet pipe is fixedly provided with a supporting ring plate (20), the supporting ring plate (20) is positioned below the inner sleeve (17), the upper surface of the supporting ring plate (20) is fixedly connected with the bottom end of a return spring (21), the top end of the return spring (21) is fixedly connected with the lower surface of a first sealing plate (22), the diameter of the first sealing plate (22) is larger than the inner diameter of the inner sleeve (17), the upper surface of the first sealing plate (22) is coaxially provided with a sealing ring (23), the lower surface of the inner sleeve (17) is provided with a ring groove matched with the sealing ring (23), the sealing ring (23) is positioned in the ring groove, the upper surface of the sealing ring (23) is fixedly provided with more than two limiting rods (24), the inner sleeve (17) is internally provided with limiting holes matched with the limiting rods (24), and the limiting rods (24) are positioned in the limiting holes; the upper surface of first closing plate (22) is coaxial to install second closing plate (25), the diameter of second closing plate (25) is less than interior diameter of sleeve pipe (17), just the diameter of second closing plate (25) is greater than the internal diameter of necking down tube (19), the upper surface of second closing plate (25) is coaxial to install sealing plug (26), the diameter of sealing plug (26) equals the internal diameter of necking down tube (19).
3. The pilot pneumatic conveying double-safety check valve according to claim 2, wherein the switch protection valve (6) comprises a threaded ring (27), threads matched with the threaded ring (27) are arranged on the inner surface of the air inlet pipe (4) close to the bottom, and the threaded ring (27) is arranged on the inner part of the air inlet pipe (4) close to the bottom in a threaded manner; the upper surface of the threaded ring (27) is coaxially provided with a fixed cover (28), and more than two vent holes (29) are formed in the fixed cover (28) in a penetrating manner; the inside of fixed cover (28) is provided with rubber cover (30), the surface of rubber cover (30) is hugged closely the internal surface of fixed cover (28), the upper surface of rubber cover (30) with the bottom fixed connection of connecting rod (7), the top of connecting rod (7) passes the roof of fixed cover (28) with the mesopore of support ring board (20) with the lower fixed surface of first closing plate (22) is connected.
4. The pilot pneumatic conveying double-safety check valve according to claim 1, wherein the top end of the air outlet pipe (11) and the bottom end of the bottom cover (12) are flush with the inner surface of the bottom wall of the lower valve body (2), and the bottom cover (12) is a table-shaped pipe with gradually smaller diameter from bottom to top; the top cover (14) is a hemispherical arc plate, and the outer surface of the top cover (14) is fixedly connected with the bottom end of the lifting frame (13); the outer surface fixed mounting of bottom cover (12) has first annular plate (32), first annular plate (32) is the platform pipe that reduces from bottom to top diameter gradually, the interior surface fixed mounting of top cover (14) has second annular plate (33), second annular plate (33) are the platform pipe that increases from bottom to top diameter gradually, first annular plate (32) with second annular plate (33) staggered distribution.
5. A pilot pneumatic conveying double safety check valve according to claim 1, characterized in that the collection assembly (15) comprises a collection ring (34), a collection pipe (35) and a sealing cover (36); the collecting ring (34) is coaxially and penetratingly arranged on the bottom wall of the lower valve body (2), and the top end of the collecting ring (34) is flush with the inner wall of the lower valve body (2); the top end of the collecting pipe (35) is fixedly connected with the lower surface of the collecting ring (34), the collecting pipe (35) is communicated with the inner cavity of the collecting ring (34), and the number of the collecting pipes (35) is more than two; the sealing cover (36) is arranged at the bottom end of the collecting pipe (35) in a threaded mode.
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| CN114249127A (en) | 2022-03-29 |
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