CN114148759A - Gas-powder conveying device without returning charge - Google Patents
Gas-powder conveying device without returning charge Download PDFInfo
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- CN114148759A CN114148759A CN202111656244.1A CN202111656244A CN114148759A CN 114148759 A CN114148759 A CN 114148759A CN 202111656244 A CN202111656244 A CN 202111656244A CN 114148759 A CN114148759 A CN 114148759A
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- pipe
- mixing
- blanking
- air inlet
- mixing pipe
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- 239000000843 powder Substances 0.000 title claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 7
- 238000013329 compounding Methods 0.000 abstract description 10
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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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
- B65G53/50—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
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
-
- 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
- B65G53/48—Screws or like rotary conveyors
-
- 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
- B65G53/58—Devices for accelerating or decelerating flow of the materials; Use of pressure generators
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
The invention discloses a gas-powder conveying device without material return, which comprises a fan, a mixer, a discharging bin and a storage bin, wherein the mixer comprises a mixing pipe extending along the horizontal direction, a discharging pipe is arranged on the upper side of the mixing pipe, the discharging pipe is used as a boundary, and the mixing pipe is divided into an air inlet section and a mixing section; a spiral plate is arranged in the air inlet section, an air inlet connecting pipe is arranged at the end part of the air inlet section, and an expansion pipe is arranged at the end part of the mixing section; the lower end of the blanking pipe is formed into a blanking port, and the blanking port extends downwards into the mixing pipe; the outlet of the fan is communicated with the air inlet connecting pipe, the expansion pipe is communicated with the storage bin through the conveying pipe, and the discharge port at the bottom of the discharging bin is communicated with the discharging pipe through the feeding pipe. This application has cancelled hob material feeding unit, and the powder is in the compounding pipe is directly entered into by the unloading pipe for powder conveyor simplifies, utilizes this application can avoid the returning charge phenomenon that feed opening department exists effectively.
Description
Technical Field
The invention relates to the field of pneumatic conveying, in particular to a gas-powder conveying device without return materials.
Background
The pneumatic conveying of powder material is one common powder material conveying mode, and during pneumatic conveying, screw pump pneumatic conveying or simple airflow conveying is adopted. The screw pump sends the powder into the mixing chamber in the pump body by using the screw rod, the compressed air enters the mixing chamber in the pump body from the air inlet, the powder and the air flow are mixed in the mixing chamber, and the air flow drives the powder to be conveyed into corresponding equipment along a pipeline. Because the hob is at the pay-off in-process, filling factor generally only is about 0.4, the powder enters into the mixing chamber with the pulse form, because the high pressure of compressed air in the mixing chamber, very easily take place gas material refluence phenomenon, produce the returning charge phenomenon promptly, in order to reduce the returning charge, generally adopt the hob of variable pitch, and improve the rotational speed of hob, but these measures all can make the pump body complicated, and strengthened the friction of hob, power consumption has still been increased, the life of screw pump has been reduced.
Simple and easy air current transport is with unloading pipe disect insertion to the compressed air pipeline in, makes the powder rely on gravity to drop to the compressed air pipeline in to being taken by compressed air, but in the feed opening department of unloading pipe, because compressed air's expansibility is great, partial compressed air can flow to the unloading pipe for partial powder returns in the unloading pipe, is called the material returning phenomenon, and compressed air's velocity of flow is lower more, and is more easily to flowing in the unloading pipe, and the material returning phenomenon that causes is more serious. In fact, no matter how high the flow rate is, part of the compressed air always flows into the blanking pipe, which affects the downward flow of the powder, but when the flow rate of the compressed air is higher after the pipeline is set, the amount of the compressed air flowing into the blanking pipe is lower, so that the simple air flow conveying generally adopts high-pressure compressed air, the power cost of the compressed air is higher, and the simple air flow conveying is only suitable for temporary use and is not suitable for long-term use.
Disclosure of Invention
In order to solve the problems, the invention provides a gas-powder conveying device without a return material, which comprises a fan, a mixer, a blanking bin and a storage bin, wherein the mixer comprises a mixing pipe extending along the horizontal direction, a blanking pipe is arranged on the upper side of the mixing pipe, the blanking pipe is positioned in the middle of the mixing pipe, and the mixing pipe is divided into an air inlet section and a mixing section by taking the blanking pipe as a boundary; the air inlet section is internally provided with a spiral plate, one end of the air inlet section, which is far away from the mixing section, is provided with an air inlet connecting pipe, one end of the mixing section, which is far away from the air inlet section, is provided with an expansion pipe, the expansion pipe is conical, the small end of the expansion pipe is arranged on the mixing section, and the large end of the expansion pipe is formed into a mixture outlet; the lower end of the blanking pipe is formed into a blanking port, and the blanking port extends downwards into the mixing pipe;
the outlet of the fan is communicated with the air inlet connecting pipe, the mixture outlet is communicated with the storage bin through a conveying pipe, and the discharge port at the bottom of the discharging bin is communicated with the discharging pipe through a feeding pipe.
In this application, this air inlet section of this air inlet of perpendicular to is taken over to this air inlet, and the air inlet is taken over along the tangential intercommunication air inlet section of air inlet section, and the export orientation of air inlet takeover is the same with the helical direction of spiral board, makes compressed air take over the direction of rotation that enters into the air inlet section through the air inlet and the helical direction of spiral board the same.
In this application, set up the spiral plate in the air inlet section, compressed air is after entering into the air inlet section, under the restriction of spiral plate, can form into spiral wind, and can flow towards the mixing section direction along the helicla flute that the spiral plate formed, compressed air forms behind the spiral wind, can form a negative pressure zone in the central zone of compounding pipe, and form a positive pressure zone in the region that closes on the compounding intraductal wall, after the feed opening stretched into in the compounding pipe, can avoid this positive pressure zone effectively, and enter into the negative pressure zone, utilize this negative pressure zone, can make the interior powder of unloading pipe enter into the compounding smoothly, and under the effect of negative pressure, move towards positive pressure zone, and mix in compressed air, then under compressed air's drive, in the conveyer pipe is entered into through the expansion pipe, finally enter into in the storage silo.
The device can be used for conveying powder of 0.01-2.5mm, and is particularly suitable for conveying powder of fly ash, limestone, cement and the like.
In this application, cancelled the hob material feeding unit in the screw pump, the powder is intraductal by the unloading pipe direct entering into the compounding for powder conveyor simplifies. Utilize this application, can also avoid prior art effectively, when adopting simple and easy air current to carry, the returning charge phenomenon that feed opening department exists.
Further, the end surface of the feed opening is inclined and faces the downstream side of the mixing pipe, or the end surface of the feed opening is deflected from the downstream side of the mixing pipe to the downstream side of the spiral direction of the spiral plate.
After the spiral plate is arranged, compressed air flows spirally in the material mixing pipe, the end face of the feed opening is set to be inclined, the end face of the feed opening faces the downstream side of the material mixing pipe, or the end face of the feed opening deflects towards the downstream side of the spiral direction, the compressed air can be made to impact the opposite side of the feed opening, the probability that the compressed air enters the feed pipe is avoided or reduced, and the smooth feeding is guaranteed. The inclined feed opening can effectively utilize the negative pressure area formed in the central area of the mixing pipe in the height direction. The feed opening is arranged to be inclined, so that the area of the feed opening can be enlarged, and powder can enter compressed air in time.
Specifically, a first included angle between the end surface of the feed opening and the horizontal plane is 14-27 degrees. In above-mentioned angle range, can avoid compressed air to enter into the unloading pipe betterly, first contained angle is too little, can't effectively utilize the regional negative pressure zone in center of mixing pipe. First contained angle is too big, and the top of feed opening can enter into the positive pressure district of compounding pipe, though the feed opening is towards the downstream side of compounding pipe, but at the positive pressure district, compressed air is when bypassing the unloading pipe, in the same time can entering into the feed opening, causes the returning charge, influences the smooth unloading of powder.
Further, in order to ensure that the feed opening is positioned in the negative pressure area of the mixing pipe, the feed opening is positioned in the middle of the mixing pipe in the height direction.
Further, observe along the length direction of mixing pipe, the feed opening is located a circular region coaxial with the mixing pipe, and the diameter in this circular region is 50% of the first internal diameter of mixing pipe, and in the direction of height, the undermost end of feed opening is downwards no longer than the central line of mixing pipe. In the height direction, the lowest point of the inner cavity of the mixing pipe is taken as a reference, and the feed opening is positioned in the range of 50-75% of the first inner diameter of the mixing pipe.
This design can make the feed opening keep in negative pressure zone, avoids producing the malleation in feed opening department, causes the returning charge, influences the unloading. The lowest end of the feed opening is located on the upper side of the central line of the mixing pipe, so that the influence on the flow of compressed air can be reduced, the design can at least ensure that the lower side of the central line of the mixing pipe is in a smooth state, and the interference on the compressed air is reduced. The discharge tube stretches into the mixing tube, the flow of compressed air is disturbed, the resistance is increased, and the design can enable powder to enter an outer layer area of the compressed air after being discharged from the discharge opening and continue to move forward along with the spiral direction of the compressed air. And after the blanking opening downwards exceeds the central line of the mixing pipe, the blanking pipe can completely block the flow of compressed air in the central area of the mixing pipe, so that the compressed air generates a large vortex around the blanking pipe, and the smooth blanking of the blanking opening is influenced.
Furthermore, the lift angle of the spiral plate is 10-25 degrees, the feed opening is elliptical, the center line of the mixing pipe is located in a second virtual plane, the long axis of the feed opening is located in the second virtual plane, and the first virtual plane and the second virtual plane extend along the vertical direction; and viewed in the vertical direction, a second included angle is formed between the first virtual plane and the second virtual plane, so that the orientation of the feed opening is deflected towards the downstream side of the spiral direction of the spiral plate relative to the downstream side of the mixing pipe, and the second included angle is 0-15 degrees. The second angle is preferably 6-15 deg..
This design can make the orientation of feed opening and the intraductal compressed air's of compounding flow direction more tend to unanimously, though the lead angle of spiral plate is less, nevertheless owing to have a cylindrical cavity in the axis region of spiral plate for the intraductal compressed air of compounding actual lead angle that flows will be great than the lead angle of spiral plate, make the feed opening only deflect a little angle towards the downstream side of the helical direction of spiral plate, can avoid compressed air to cause big impact to the feed opening betterly, in order to guarantee the smooth and easy of unloading.
Furthermore, an outer sleeve is fixedly arranged on the upper side of the mixing pipe, the outer sleeve extends along the vertical direction, the blanking pipe is freely inserted into the outer sleeve and extends into the mixing pipe, a handle is fixedly arranged on the blanking pipe, the handle hermetically extends outwards through a gap between the feeding pipe and the outer sleeve, and the handle is pushed to enable the blanking pipe to rotate in the outer sleeve.
When the design is carried out, the simulation can be carried out only according to the lift angle of the spiral plate, the obtained data has certain deviation with the actual operation, but the deviation is influenced by factors such as pipe diameter, flow velocity of compressed air, pressure and the like, the actual operation is completely simulated, the difficulty is high, after the outer sleeve is arranged, the blanking pipe can be rotated in the operation process, the orientation of the blanking opening is adjusted, and the optimal blanking effect is obtained.
Specifically, in order to avoid the discharge pipe from causing great influence on the flow of the compressed air in the mixing pipe, the second inner diameter of the discharge pipe is 30-60% of the first inner diameter of the mixing pipe. More preferably, the second inner diameter is 40 to 50% of the first inner diameter.
Further, a stable negative pressure area is formed in the central area in the mixing pipe, the flow speed of compressed air in the mixing pipe is 8-12m/s, and the pressure is 0.025-0.035 MPa. In the flow velocity and pressure range, the central area in the mixing pipe can generate larger negative pressure so as to be beneficial to blanking and smoothly convey powder.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of the mixer.
Fig. 3 is a view from a-a in fig. 2.
Fig. 4 is a view in the direction B-B in fig. 2.
Fig. 5 is a view in the direction of C-C in fig. 2.
Fig. 6 is a view from E-E in fig. 2.
Fig. 7 is a partial perspective view of the mixing tube.
Fig. 8 is a partially enlarged view of a portion F in fig. 2.
Detailed Description
Referring to fig. 1 to 8, a gas-powder conveying device without a return charge comprises a blower 11, a mixer 20, a discharging bin 41 and a storage bin 32, wherein the mixer 20 comprises a mixing pipe 21 extending along a horizontal direction, a discharging pipe 22 is installed on the upper side of the mixing pipe, the discharging pipe 22 is located in the middle of the mixing pipe, and the mixing pipe is divided into an air inlet section 211 and a mixing section 212 by taking the discharging pipe 22 as a boundary. The spiral plate 25 is arranged in the air inlet section 211, an air inlet connecting pipe 27 is arranged at one end of the air inlet section, which is far away from the mixing section, the air inlet connecting pipe 27 is perpendicular to the air inlet section, the air inlet connecting pipe is communicated with the air inlet section along the tangential direction of the air inlet section, the outlet direction of the air inlet connecting pipe is the same as the spiral direction of the spiral plate, and the rotating direction of compressed air entering the air inlet section through the air inlet connecting pipe is the same as the spiral direction of the spiral plate.
An expansion pipe 23 is installed at one end of the mixing section 212, which is far away from the air inlet section 211, the expansion pipe 23 is in a conical shape, the small end of the expansion pipe 23 is installed on the mixing section 212, and the large end of the expansion pipe is formed as a mixture outlet 231. The lower end of the feed pipe is formed as a feed opening 221, and the feed opening 221 extends downward into the mixing pipe 21. The taper angle beta of the expansion tube is 25 deg..
The outlet of the blower 11 is connected to the air inlet connecting pipe 27 through the blast pipe 10, the mixture outlet 231 is connected to the storage bin 32 through the delivery pipe 31, and the discharge outlet at the bottom of the discharge bin is connected to the discharge pipe 22 through the feed pipe 44. A safety valve 12, a pressure gauge 13, and an adjusting valve 15 are attached to the blast pipe 10.
In this embodiment, a discharge hole at the bottom of the discharging bin is provided with a discharging valve set 42, which comprises an 8-shaped blind plate valve 421, a gate valve 422 and a first regulating valve 423 that are sequentially connected from top to bottom. 8 word blind plate valve 421 wherein are used for opening or close the discharge gate, and push-pull valve 422 seals the discharge gate when being used for overhauing, and first push-pull valve is used for adjusting the load of feed bin down.
The lower side of the blanking valve group is connected with a buffer bin 43, the outlet at the bottom of the buffer bin is connected to the top of a feeding pipe 44, and a second regulating valve 45 is installed on the feeding pipe 44. The buffering bin is used for buffering materials, and secondary adjustment is carried out on the amount of the materials entering the discharging pipe through the second adjusting valve.
The end surface of the feeding opening 221 is inclined, and in this embodiment, a first included angle α between the end surface of the feeding opening and a horizontal plane is 25 °.
The discharge opening 221 is located in a circular area 210 coaxial with the mixing pipe 21 as viewed along the length direction of the mixing pipe 21, the diameter D of the circular area 210 is 50% of the first inner diameter D of the mixing pipe 21, and the lowest end 222 of the discharge opening does not exceed the center line 200 of the mixing pipe downwards in the height direction.
In this embodiment, the lift angle of the spiral plate 25 is 12 °, the feed opening is in an elliptical shape with a short axis extending along the horizontal direction, please refer to fig. 5 and 7, the center line 200 of the mixing pipe is located in a first virtual plane 310, the long axis 227 of the feed opening is located in a second virtual plane 320, and both the first virtual plane 310 and the second virtual plane 320 extend along the vertical direction; viewed in the vertical direction, the first imaginary plane 310 and the second imaginary plane 320 have a second angle θ, which is 14 °, between them, so that the orientation of the feed opening is deflected towards the downstream side of the spiral direction of the spiral plate relative to the downstream side of the mixing pipe. In the drawing, the first arrow 510 points to the downstream side of the mixing tube, the second arrow 520 points to the direction of the feed opening, the third arrow 530 points to the downstream side of the spiral direction of the spiral plate, and the fourth arrow 540 indicates the spiral direction of the compressed air in the mixing tube, and in fig. 7, the outer sleeve has been omitted for clarity. It will be appreciated that in other embodiments, the second included angle θ may also be 0 ° even though the feed opening is towards the downstream side of the mixing pipe, in case of lower requirements. It is understood that in other embodiments, depending on the flow rate and pressure of the compressed air, the second included angle θ may be 6 ° or 10 °.
In this embodiment, an outer sleeve 24 is fixedly installed on the upper side of the mixing pipe 21, the outer sleeve extends in the vertical direction, and a first flange 241 is installed on the top of the outer sleeve 24.
The blanking pipe 22 is freely inserted into the outer sleeve 24 and extends into the mixing pipe, an annular flange 225 is fixedly mounted on the top of the blanking pipe 22, the annular flange 225 projects outward in the radial direction of the blanking pipe, and a handle 226 is mounted on the outer peripheral surface of the annular flange 225 and projects outward in the radial direction of the blanking pipe from the outer peripheral surface of the annular flange 225.
The feed tube 44 is provided at its lower end with a second flange 441, the second flange 441 being detachably mounted on the first flange 241 via bolts, wherein the annular flange 225 is tightly clamped between the first flange and the second flange, and the handle 226 projects outwardly beyond the outer peripheral surface of the first flange and the outer peripheral surface of the second flange, i.e. the handle projects sealingly outwardly through a gap between the feed tube and the outer sleeve. The handle is pushed to push the blanking pipe to rotate in the outer sleeve, so that the orientation of the blanking port is adjusted, when the blanking pipe is rotated, the nut on the bolt is preferably slightly unscrewed, the blanking pipe is conveniently and smoothly rotated, and after the rotation of the blanking pipe is completed, the bolt is screwed down. In order to improve the sealing performance, a sealing air ring can be arranged between the first flange and the second flange in a cushioning mode, or sealing rings can be arranged between the first flange and the annular flange and between the second flange and the annular flange in a cushioning mode. In the present embodiment, the sealing rings are disposed between the first flange and the annular flange, and between the second flange and the annular flange. The second inner diameter of the blanking pipe is the same as the third inner diameter of the feeding pipe.
In this embodiment, the blanking pipe is made of a 76 × 3 steel pipe, the mixing pipe is made of a 159 × 4 steel pipe, so that the second inner diameter of the blanking pipe is 70mm, the first inner diameter D of the mixing pipe is 151mm, the inner diameter of the large end of the expansion pipe 23 is 420mm, and the lengths of the air inlet section 211 and the mixing section 212 are both 1.08 m.
In the embodiment, the flow velocity of compressed air in the mixing pipe is 10m/s, the pressure is 0.03MPa, the compressed air forms spiral wind in the mixing pipe, the compressed air in the mixing pipe is simulated by Fluent software, the tangential flow velocity at a position 2mm away from the inner wall of the mixing pipe in the mixing pipe can reach 302m/s, positive pressure of 0.66MPa is generated at a position 2mm away from the inner wall of the mixing pipe due to the centrifugal effect produced by the spiral wind, negative pressure of-0.57 MPa is generated at a position 3mm away from the central line of the mixing pipe, so that at least 1.23MPa of pressure difference is generated in the radial direction in the mixing pipe, and powder discharged from the discharging pipe can flow towards the inner wall of the mixing pipe in the radial direction by utilizing the pressure difference and is mixed with the compressed air, so that negative pressure is prevented from being generated at the discharging port.
This example is used for the transport of limestone powder of 0.5-1 mm.
Claims (9)
1. A gas-powder conveying device without material return is characterized by comprising a fan, a mixer, a blanking bin and a storage bin, wherein the mixer comprises a mixing pipe extending along the horizontal direction, a blanking pipe is arranged on the upper side of the mixing pipe, the blanking pipe is positioned in the middle of the mixing pipe, the blanking pipe is used as a boundary, and the mixing pipe is divided into an air inlet section and a mixing section; the air inlet section is internally provided with a spiral plate, one end of the air inlet section, which is far away from the mixing section, is provided with an air inlet connecting pipe, one end of the mixing section, which is far away from the air inlet section, is provided with an expansion pipe, the expansion pipe is conical, the small end of the expansion pipe is arranged on the mixing section, and the large end of the expansion pipe is formed into a mixture outlet; the lower end of the blanking pipe is formed into a blanking port, and the blanking port extends downwards into the mixing pipe;
the outlet of the fan is communicated with the air inlet connecting pipe, the mixture outlet is communicated with the storage bin through a conveying pipe, and the discharge port at the bottom of the discharging bin is communicated with the discharging pipe through a feeding pipe.
2. The gas-powder conveying apparatus according to claim 1, wherein an end surface of the feed opening is inclined, and the end surface of the feed opening is directed to a downstream side of the mixing pipe, or the end surface of the feed opening is deflected toward a downstream side in a spiral direction of the spiral plate from the downstream side of the mixing pipe.
3. The gas-powder conveying apparatus according to claim 2,
the first included angle between the end surface of the feed opening and the horizontal plane is 14-27 degrees.
4. The gas-powder conveying apparatus according to claim 2,
in the height direction, the feed opening is located the intermediate part of mixing pipe.
5. The gas-powder conveying device according to claim 2, wherein the discharge opening is located in a circular area coaxial with the mixing pipe as viewed in a length direction of the mixing pipe, the diameter of the circular area is 50% of the first inner diameter of the mixing pipe, and a lowermost end of the discharge opening does not extend downward beyond a center line of the mixing pipe in a height direction.
6. The gas-powder conveying apparatus according to claim 5,
the lift angle of the spiral plate is 10-25 degrees, the feed opening is elliptical, the center line of the mixing pipe is located in a second virtual plane, the long axis of the feed opening is located in the second virtual plane, and the first virtual plane and the second virtual plane extend along the vertical direction; and viewed in the vertical direction, a second included angle is formed between the first virtual plane and the second virtual plane, so that the orientation of the feed opening is deflected towards the downstream side of the spiral direction of the spiral plate relative to the downstream side of the mixing pipe, and the second included angle is 0-15 degrees.
7. The gas-powder conveying apparatus according to claim 2,
the upper side of the mixing pipe is fixedly provided with an outer sleeve, the outer sleeve extends along the vertical direction, the blanking pipe is freely inserted into the outer sleeve and extends into the mixing pipe, a handle is fixedly arranged on the blanking pipe, the handle hermetically extends out through a gap between the feeding pipe and the outer sleeve, and the handle is pushed to enable the blanking pipe to rotate in the outer sleeve.
8. The gas-powder conveying apparatus according to claim 1,
the second inner diameter of the blanking pipe is 30-60% of the first inner diameter of the mixing pipe.
9. The gas-powder conveying apparatus according to claim 1, wherein the flow rate of the compressed air in the mixing pipe is 8 to 12m/s, and the pressure is 0.025 to 0.035 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111656244.1A CN114148759B (en) | 2021-12-30 | 2021-12-30 | Gas-powder conveying device without returning charge |
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| CN202111656244.1A CN114148759B (en) | 2021-12-30 | 2021-12-30 | Gas-powder conveying device without returning charge |
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| CN114148759A true CN114148759A (en) | 2022-03-08 |
| CN114148759B CN114148759B (en) | 2024-03-15 |
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