CN113307037A - Dilute phase pneumatic conveying cyclone antifriction elbow - Google Patents
Dilute phase pneumatic conveying cyclone antifriction elbow Download PDFInfo
- Publication number
- CN113307037A CN113307037A CN202110416476.3A CN202110416476A CN113307037A CN 113307037 A CN113307037 A CN 113307037A CN 202110416476 A CN202110416476 A CN 202110416476A CN 113307037 A CN113307037 A CN 113307037A
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- Prior art keywords
- elbow
- pipe
- air
- outlet
- antifriction
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- Granted
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- 239000012530 fluid Substances 0.000 claims abstract description 23
- 238000007664 blowing Methods 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
- B65G53/50—Pneumatic devices
-
- 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
Abstract
A dilute phase pneumatic conveying rotational flow antifriction elbow, the inner diameter of an elbow pipe is larger than that of an inlet pipe, after fluid enters the elbow from the inlet pipe, the speed is reduced due to the increase of the flow area, the flow speed is reduced, the dynamic pressure is reduced, the static pressure is increased, the inner diameter of the elbow pipe is larger than that of an outlet pipe, the flow speed of the gas entering the outlet pipe from the elbow pipe is increased, the pressure of the fluid is reduced, and therefore, pressure difference is generated at an inlet and an outlet of the elbow; the air flow is pressed into the tangential small holes under the influence of pressure difference, the air at the inlet pipe is simultaneously acted by axial force and radial force to generate rotational flow, and particles in the blowing fluid spirally advance; the speed is reduced, the impact speed of particles and the wall surface in the elbow is reduced, and the impact area is uniformly dispersed; the airflow shunted at the outlet can accelerate the fluid flowing out of the elbow pipe through the axially inclined small hole to form a rotary suction effect, so that the acceleration is realized, and the blockage caused by the reduction of the speed is avoided. The elbow can reduce the impact of the transported particles on the elbow pipe and prolong the service life of the pipeline.
Description
Technical Field
The invention relates to the technical field of pneumatic transmission, in particular to a dilute-phase pneumatic transmission rotational flow antifriction elbow.
Background
The dilute phase pneumatic conveying is to utilize the air flow produced by fan or vacuum pump in the pipeline, and adopts positive pressure or negative pressure and higher speed to push or pull the material to flow in the pipeline so as to convey the material to corresponding equipment. The impact and friction of the scattered powder and granular materials on the pipe wall in the conveying process are main causes of pipe abrasion. Powder and particle materials enter the elbow pipe, and impact abrasion is generated on the pipe wall due to the change of the moving and conveying direction, so that the elbow pipe is the most easily abraded part, and the abrasion of the elbow pipe is greatly higher than that of the straight pipe.
Most of the existing antifriction elbow pipes in the market are realized by changing the material of the pipe wall of the elbow pipe, so that the wear of the pipe wall of the elbow pipe can be effectively reduced, but the whole cost of the elbow pipe is increased due to the adoption of the wear-resistant material. Some antifriction elbows are externally provided with additional gas transmission pipelines, so that although the abrasion to the elbow pipes can be reduced, each elbow pipe needs to be provided with an additional gas transmission device, for example, Chinese patent 201710370229.8 discloses a structure, a device and a method for preventing the abrasion of the pneumatic transmission elbow pipe, namely, the additional gas transmission device is used for filling gas into a tubular cavity, so that the gas enters the transmission elbow pipe through a gas permeable plate to form a gas cushion layer resisting pneumatic scouring so as to reduce the direct impact and friction of powder and granular materials on the pipelines, and the improvement cost of the elbow by the scheme is greatly increased and is not compensated.
Disclosure of Invention
In order to solve the problems, the invention provides a dilute phase pneumatic conveying rotational flow antifriction elbow.
The technical scheme of the invention is as follows: the utility model provides a dilute phase air conveying whirl antifriction elbow, includes elbow pipe one end sealing connection's import pipe, elbow pipe other end sealing connection's outlet pipe, characterized by:
a sleeve is arranged on the outer side of the inner end of the inlet pipe to form an annular air chamber A, a plurality of tangential air inlets communicated with the annular air chamber A are densely distributed on the side wall of the inner end of the inlet pipe, a sleeve is arranged on the outer side of the inner end of the outlet pipe to form an annular air chamber B, and a plurality of power-assisted air blowing holes which are communicated with the annular air chamber B and point to the outlet in an inclined mode along an axial section are densely distributed on the side wall of the inner end of the outlet pipe;
a plurality of through holes A are uniformly distributed on the sealing plate of the annular gas cavity A along the circumferential direction, a plurality of through holes B corresponding to the through holes A are uniformly distributed on the sealing plate of the annular gas cavity B along the circumferential direction, a bypass gas pipe is connected between the corresponding through holes A and the through holes B, and a Tesla valve is arranged on the bypass gas pipe;
the inner diameters of the inlet pipe and the outlet pipe are smaller than that of the elbow pipe, and the diameters of the tangential air inlet hole and the power-assisted air blowing hole which is obliquely directed to the outlet along the axial tangent plane are smaller than the minimum diameter of particles in the fluid.
Preferably, the plurality of tangential air inlets are a plurality of circles of air inlet groups which are arranged at equal intervals in the axial direction, and the plurality of air inlets on each circle of air inlet group are uniformly distributed.
Preferably, the plurality of power-assisted air blowing holes which are obliquely directed to the outlet along the axial tangent plane are a plurality of circles of air blowing hole groups which are arranged at equal intervals in the axial direction, and the air blowing holes on each circle of air blowing hole group are uniformly distributed.
Preferably, the bypass air pipes are bent bypass air pipes arranged along the central line direction of the elbow pipe.
Preferably, the bypass air pipe at the outermost side of the elbow pipe is an elbow bypass air pipe arranged along the direction of the central line of the elbow pipe, and the bypass air pipes at the two sides and the inner side of the elbow pipe are straight bypass air pipes connected between the through hole A and the through hole B.
Preferably, the bypass air pipes are four bypass air pipes arranged at equal intervals.
Preferably, a chamfer angle is arranged at the joint of the inner end of the inlet pipe and the elbow pipe to form a bell mouth, and a chamfer angle is arranged at the joint of the inner end of the outlet pipe and the elbow pipe to form a bell mouth.
The beneficial technical effects of the invention are as follows:
the dilute phase pneumatic conveying rotational flow antifriction elbow is characterized in that the inner diameter of the elbow pipe is larger than that of the inlet pipe, after fluid enters the elbow from the inlet pipe, the speed of the fluid is reduced due to the increase of the flow area, the flow speed is reduced, the dynamic pressure is reduced, the static pressure is increased, the inner diameter of the elbow pipe is larger than that of the outlet pipe, the flow speed of the gas entering the outlet pipe from the elbow pipe is increased, the pressure of the fluid is reduced, and therefore pressure difference is generated at the inlet and the outlet due to the combination of the local pressure loss of the elbow and the pipe diameter change of the inlet and the outlet of the elbow; .
The air flow is pressed into the tangential small holes under the influence of pressure difference, at the moment, the air at the inlet pipe is simultaneously acted by axial force and radial force to generate rotational flow, particles in the blowing fluid spirally advance, and meanwhile, because the air flow at the inlet of the elbow is divided, the flow speed of the air flow and the particles is reduced, the impact speed of the particles and the wall surface in the elbow is reduced, and the impact area is uniformly dispersed; when the airflow flows out of the outlet of the elbow, the airflow shunted at the outlet can accelerate the fluid flowing out of the elbow pipe through the small axial inclined holes to form a rotary suction effect, so that the acceleration of the airflow and particles is realized, and the blockage of the elbow pipe caused by the reduction of the particle speed is avoided; the dilute phase pneumatic conveying rotational flow antifriction elbow can effectively reduce local impact on the fluid elbow pipe on the premise of not increasing an additional gas conveying device, can also increase the outflow speed of fluid through the elbow pipe, and prolongs the service life of a pipeline.
Drawings
FIG. 1 is a schematic perspective view of the invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic front view of the present invention;
FIG. 5 is a sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic view of the bypass pipes on both sides of the elbow of the present invention as branch pipes.
In the figure, 11, an elbow pipe, 12, an inlet pipe, 121, an annular air chamber A, 1211, a through hole A, 122, a tangential air inlet hole, 13, an outlet pipe, 131, an annular air chamber B, 1311, a through hole B, 132, an assistant air blowing hole which is obliquely directed to an outlet along an axial section, 14, a bypass air pipe, 15, a Tesla valve and 16 are chamfered.
Detailed Description
In the first embodiment, referring to the attached figures 1-5 of the specification, a dilute phase pneumatic conveying rotational flow antifriction elbow comprises an inlet pipe and an outlet pipe, wherein one end of the elbow pipe is hermetically connected with the inlet pipe, the other end of the elbow pipe is hermetically connected with the outlet pipe, the outer side of the inner end of the inlet pipe is provided with a sleeve-shaped annular air chamber A, the side wall of the inner end of the inlet pipe is densely provided with a plurality of tangential air inlets communicated with the annular air chamber A, the outer side of the inner end of the outlet pipe is provided with a plurality of boosting air blowing holes communicated with the annular air chamber B and obliquely directed to the outlet along an axial tangent plane, the inner diameters of the inlet pipe and the outlet pipe are both smaller than the inner diameter of the elbow pipe, the diameters of the tangential air inlets and the boosting air blowing holes obliquely directed to the outlet along the axial tangent plane are both smaller than the minimum diameter of particles in a fluid, therefore, the particles in the fluid can not enter the radial tangential holes, and only the gas in the fluid enters the bypass gas pipe to form an additional gas pipe; the particles in the fluid can not block the boosting air blowing hole which is obliquely directed to the outlet along the axial tangent plane.
The sealing plate of the annular gas chamber A is uniformly provided with a plurality of through holes A along the circumferential direction, the sealing plate of the annular gas chamber B is uniformly provided with a plurality of through holes B corresponding to the through holes A along the circumferential direction, a bypass gas pipe is connected between the corresponding through holes A and the through holes B, and a Tesla valve is arranged on the bypass gas pipe and has the principle that when gas enters the Tesla valve at one side, the gas is divided into two parts by one gas flow under the influence of the internal structure, and the two gas flows collide with each other to reduce the flow velocity, then the gas is divided into two gas flows to continue to collide with each other, and the flow velocity continues to be reduced until the gas stops advancing, so that the gas can only flow in one direction, and the gas backflow blockage is prevented;
the plurality of tangential air inlets are a plurality of circles of air inlet hole groups which are arranged at equal intervals in the axial direction, a plurality of air inlets on each circle of air inlet hole group are uniformly distributed, a plurality of power-assisted air blowing holes which are inclined along the axial tangent plane and point to the outlet are a plurality of circles of air blowing hole groups which are arranged at equal intervals in the axial direction, and air blowing holes on each circle of air blowing hole group are uniformly distributed.
The bypass air pipes are all bent bypass air pipes arranged along the central line direction of the elbow pipe, and the bypass air pipes are four bypass air pipes arranged at equal intervals.
The junction of the inner end of the inlet pipe and the elbow pipe is provided with a chamfer to form a bell mouth, and the junction of the inner end of the outlet pipe and the elbow pipe is provided with a chamfer to form a bell mouth.
The working process and principle of the invention are as follows:
the dilute phase pneumatic conveying rotational flow antifriction elbow is characterized in that the inner diameter of the elbow pipe is larger than that of the inlet pipe, after fluid enters the elbow from the inlet pipe, the speed of the fluid is reduced due to the increase of the flow area, the flow speed is reduced, the dynamic pressure is reduced, the static pressure is increased, the inner diameter of the elbow pipe is larger than that of the outlet pipe, the flow speed of the gas entering the outlet pipe from the elbow pipe is increased, the pressure of the fluid is reduced, and therefore pressure difference is generated at the inlet and the outlet due to the combination of pipe diameter change at the local pressure loss of the elbow and the inlet and outlet positions of the elbow.
The air flow is pressed into the tangential small holes under the influence of pressure difference, and at the moment, the air at the inlet pipe is simultaneously acted by axial force and radial force to generate rotational flow so as to blow particles in the fluid to spirally advance; meanwhile, as the airflow at the inlet of the elbow is divided, the flow speed of the airflow and the particles is reduced, the impact speed of the particles and the wall surface in the elbow is reduced, and the impact area is uniformly dispersed; when the airflow flows out of the outlet of the elbow, the airflow shunted at the outlet can accelerate the fluid flowing out of the elbow through the axially inclined small holes to form a rotary suction effect, so that the acceleration of the airflow and particles is realized, and the blockage of the elbow pipe caused by the reduction of the particle speed is avoided. The structure can reduce the internal abrasion of the elbow and prolong the service life of the pipeline. The Tesla valve is arranged in the bypass gas path to avoid reverse flow of the airflow, and because no parts such as a valve core, a valve plate and the like are arranged in the Tesla valve, the energy loss is low when the airflow flows in the forward direction.
The second embodiment is basically the same as the first embodiment with reference to fig. 6 in the specification, except that the bypass air pipe at the outermost side of the elbow pipe is a bent bypass air pipe arranged along the direction of the central line thereof, the bypass air pipes at both sides of the elbow pipe and the bypass air pipe at the inner side of the elbow pipe are straight bypass air pipes connected between the through hole a and the through hole b, and the bypass air pipes are straight pipes, so that the manufacturing cost of the elbow pipe is reduced, the flowing distance of gas in the bypass air pipes is reduced, and the thrust for pushing particles in the fluid to advance in a secondary acceleration mode is increased.
Claims (7)
1. The utility model provides a dilute phase air conveying whirl antifriction elbow, includes elbow pipe one end sealing connection's import pipe, elbow pipe other end sealing connection's outlet pipe, characterized by:
a sleeve is arranged on the outer side of the inner end of the inlet pipe to form an annular air chamber A, a plurality of tangential air inlets communicated with the annular air chamber A are densely distributed on the side wall of the inner end of the inlet pipe, a sleeve is arranged on the outer side of the inner end of the outlet pipe to form an annular air chamber B, and a plurality of power-assisted air blowing holes which are communicated with the annular air chamber B and point to the outlet in an inclined mode along an axial section are densely distributed on the side wall of the inner end of the outlet pipe;
a plurality of through holes A are uniformly distributed on the sealing plate of the annular gas cavity A along the circumferential direction, a plurality of through holes B corresponding to the through holes A are uniformly distributed on the sealing plate of the annular gas cavity B along the circumferential direction, a bypass gas pipe is connected between the corresponding through holes A and the through holes B, and a Tesla valve is arranged on the bypass gas pipe;
the inner diameters of the inlet pipe and the outlet pipe are smaller than that of the elbow pipe, and the diameters of the tangential air inlet hole and the power-assisted air blowing hole which is obliquely directed to the outlet along the axial tangent plane are smaller than the minimum diameter of particles in the fluid.
2. The dilute phase pneumatic conveying cyclone antifriction elbow of claim 1, characterized in that: the plurality of tangential air inlets are a plurality of circles of air inlet groups which are arranged at equal intervals in the axial direction, and the plurality of air inlets on each circle of air inlet group are uniformly distributed.
3. The dilute phase pneumatic conveying cyclone antifriction elbow of claim 1, characterized in that: the plurality of power-assisted air blowing holes which are obliquely directed to the outlet along the axial tangent plane are a plurality of circles of air blowing hole groups which are arranged at equal intervals in the axial direction, and the air blowing holes on each circle of air blowing hole group are uniformly distributed.
4. The dilute phase pneumatic conveying cyclone antifriction elbow of claim 1, characterized in that: the bypass air pipes are bent bypass air pipes arranged along the central line direction of the elbow pipe.
5. The dilute phase pneumatic conveying cyclone antifriction elbow of claim 1, characterized in that: the bypass air pipe on the outermost side of the elbow pipe is a bent bypass air pipe arranged along the direction of the central line of the elbow pipe, and the bypass air pipes on the two sides of the elbow pipe are straight bypass air pipes connected between the through hole A and the through hole B.
6. The dilute phase pneumatic conveying cyclone antifriction elbow according to any one of claims 4-5, characterized in that: the bypass air pipes are four bypass air pipes arranged at equal intervals.
7. The dilute phase pneumatic conveying cyclone antifriction elbow of claim 1, characterized in that: the junction of the inner end of the inlet pipe and the elbow pipe is provided with a chamfer to form a bell mouth, and the junction of the inner end of the outlet pipe and the elbow pipe is provided with a chamfer to form a bell mouth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110415141 | 2021-04-17 | ||
| CN202110415141X | 2021-04-17 |
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| CN113307037A true CN113307037A (en) | 2021-08-27 |
| CN113307037B CN113307037B (en) | 2022-11-15 |
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| CN202110416476.3A Active CN113307037B (en) | 2021-04-17 | 2021-04-19 | Dilute phase pneumatic conveying cyclone antifriction elbow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114275541A (en) * | 2022-01-24 | 2022-04-05 | 上海在田环境科技有限公司 | Automatic control direction changing device for double-phase pneumatic conveying |
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| CN109230549A (en) * | 2018-10-11 | 2019-01-18 | 中国矿业大学 | A kind of compound pneumatic conveying eddy flow bend pipe |
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| CN110921333A (en) * | 2019-12-24 | 2020-03-27 | 威立雅（哈尔滨）热电有限公司 | Wear-proof elbow for pneumatic conveying |
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| CN210950357U (en) * | 2019-07-17 | 2020-07-07 | 河北宏程管业有限公司 | Elbow capable of buffering impact force |
| CN211398945U (en) * | 2020-01-15 | 2020-09-01 | 中冶建工集团有限公司 | Wear-resistant bent pipe for conveying concrete |
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| CN113307037B (en) | 2022-11-15 |
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Application publication date: 20210827 Assignee: BENSV VALVE STOCK Co.,Ltd. Assignor: NORTH CHINA University OF WATER RESOURCES AND ELECTRIC POWER Contract record no.: X2024120000015 Denomination of invention: Dilute phase pneumatic conveying swirl wear reducing elbow Granted publication date: 20221115 License type: Common License Record date: 20240122 |