Positive pressure pneumatic conveying apparatus and positive pressure pneumatic conveying method

Abstract

The positive pressure pneumatic conveying device comprises a positive pressure dense-phase tank, an elbow pipe and a connecting assembly. The positive pressure dense-phase tank is formed with a positive pressure cavity. The elbow pipe is formed with a conveying channel. The connecting assembly is connected with an output end of the positive pressure dense-phase tank and an input end of the elbow pipe respectively. The connecting assembly is provided with a material passing channel. The positive pressure cavity is communicated with the conveying channel through the material passing channel. The connecting assembly is formed with a spiral air outlet cavity which is communicated with the material passing channel. A spiral powder sweeping groove is formed in a bottom wall of the conveying channel. The spiral powder sweeping groove is located at a bending position of the elbow pipe. An inverse blowing channel is formed in a bottom of the elbow pipe. The inverse blowing channel is communicated with one end of the spiral powder sweeping groove which is away from the positive pressure dense-phase tank. The extension direction of the inverse blowing channel is towards one end of the spiral powder sweeping groove which is adjacent to the positive pressure dense-phase tank. The inverse blowing channel and the spiral air outlet cavity are both used for being communicated with an external air source. Thus, the stability of the device is higher, and the metering accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of positive pressure pneumatic conveying equipment, and in particular to a positive pressure pneumatic conveying equipment and a positive pressure pneumatic conveying method. BACKGROUND

[0002] The positive pressure pneumatic conveying equipment is a kind of equipment for conveying materials in a pipeline by using compressed air, which has good sealing performance, high conveying efficiency, can be conveyed over a long distance, and has high automation degree, and is widely used in various fields. The positive pressure pneumatic conveying equipment relies on high air speed higher than the settling velocity of the powder to prevent the powder from depositing and blocking, so as to achieve the effect of conveying the powder.

[0003] In the related art, CN202935945U discloses a positive and negative pressure combined type dense phase powder material pneumatic conveying device. After the powder inlet valve is closed, the compressed air inlet valve is opened to fill clean compressed air into the positive pressure conveying sending bin. When the pressure in the positive pressure conveying sending bin reaches the set value, the powder and compressed air in the positive pressure conveying sending bin have been sufficiently mixed. At this time, the pipeline valve is opened, and the pressurized powder material in the positive pressure conveying sending bin will enter the designated conveying point along the powder outlet pipeline. Of course, some air supplement valves need to be arranged on the powder outlet pipeline like a general positive pressure conveying system, and some material conveying state control valves can also be arranged at the lower end of the positive pressure conveying sending bin to control the conveying state of the powder material. When the powder material in the positive pressure conveying sending bin is completely conveyed, the pressure in the positive pressure conveying sending bin gradually returns to the normal pressure state.

[0004] CN208948378U discloses a positive pressure dense phase conveying system for lithium battery positive electrode material powder conveying. After the bin pump loading process is completed, the discharge valve is opened, and then the dust collector inlet valve and the conveying inlet valve on the inlet pipe are sequentially opened. The ternary material powder enters the communication pipeline two, and the positive pressure thrust generated at the top of the dense phase pump and the negative pressure suction force formed at the dust collector of the dense phase pump outlet send the ternary material powder into the communication pipeline two and convey it to the receiving bin. After the powder is separated from the gas in the receiving bin, the exhaust gas is filtered by the receiving bin dust collector and then discharged into the atmosphere.

[0005] CN211056223U discloses a positive pressure dense phase conveying system. Raw materials are conveyed into a rotary kiln by a screw feeder through a feed hopper. After calcination in the rotary kiln, the obtained powder material enters a sending tank. When the sending tank is filled, the feed valve and the exhaust valve of the sending tank are closed and sealed at the same time. Then, compressed air is added to the sending tank by an air compressor, and the added compressed air is mixed with the material. When the pressure in the tank reaches the set value, the bottom discharge valve is automatically opened. At this time, pressure is applied to the entire conveying pipeline, and then the material is conveyed to the powder storage tank through the conveying pipeline. When the material in the sending tank is exhausted and the pressure in the sending tank is reduced to zero, the air compressor stops supplying air.

[0006] It should be noted that after the due diligence of the present scheme creative novelty search, the following technical documents are provided for reference:

[0007] 1. CN110342261A - A pneumatic conveying system;

[0008] 2. CN102491093A - Positive pressure pneumatic conveying system and method;

[0009] 3. CN106108108A - Cut tobacco positive pressure dense phase pneumatic conveying system;

[0010] 4. CN217866929U - A positive pressure pneumatic conveying system.

[0011] However, in actual application, the flow rate of air flow changes at the elbow and the reducing portion, resulting in material deposition at the reducing portion and the elbow, specifically, material deposition at the connecting assembly between the positive pressure dense phase tank and the elbow pipe, and at the bottom of the elbow pipe, which not only affects the stability of the equipment operation, but also affects the measurement accuracy. SUMMARY

[0012] The purpose of the present disclosure is to overcome the shortcomings in the prior art, and to provide a positive pressure pneumatic conveying device and method with higher stability and measurement accuracy.

[0013] The purpose of the present disclosure is achieved by the following technical solutions:

[0014] A positive pressure pneumatic conveying device, comprising a positive pressure dense phase tank, an elbow pipe and a connecting assembly, the positive pressure dense phase tank is formed with a positive pressure cavity, the elbow pipe is formed with a conveying passage, the connecting assembly is connected with the output end of the positive pressure dense phase tank and the input end of the elbow pipe respectively, the connecting assembly is provided with a material passing passage, and the positive pressure cavity is communicated with the conveying passage through the material passing passage.

[0015] The connecting assembly is formed with a spiral air outlet cavity, the spiral air outlet cavity is communicated with the material passing passage, and the spiral air outlet cavity is also used for communicating with an external air source; a spiral powder sweeping groove is formed in the bottom wall of the conveying passage, the spiral powder sweeping groove is located at the elbow of the elbow pipe, a reverse blowing passage is formed in the bottom of the elbow pipe, the reverse blowing passage is communicated with one end of the spiral powder sweeping groove away from the positive pressure dense phase tank, the extension direction of the reverse blowing passage is towards one end of the spiral powder sweeping groove adjacent to the positive pressure dense phase tank, and the reverse blowing passage is also used for communicating with an external air source.

[0016] In one of the embodiments, the connecting assembly comprises a first connecting piece and a second connecting piece, the first connecting piece is fixedly connected to the output end of the positive pressure dense phase tank, the second connecting piece is fixedly connected to the input end of the elbow pipe, the first connecting piece is fixedly connected with the second connecting piece, the first connecting piece is provided with a first material passing hole, the second connecting piece is provided with a second material passing hole, the first material passing hole and the second material passing hole are communicated and jointly form the material passing channel.

[0017] In one of the embodiments, the outer side of the first connecting piece is provided with an air inlet hole for communicating with an external air source, the side adjacent to the second connecting piece of the first connecting piece is provided with an annular air distribution groove and a spiral air outlet groove, the annular air distribution groove is communicated with the air inlet hole, a plurality of spiral air outlet grooves are arranged along the circumference of the annular air distribution groove, and the two ends of the spiral air outlet groove are communicated with the annular air distribution groove and the first material passing hole respectively; the inner wall of the spiral air outlet groove and the second connecting piece adjacent to the first connecting piece jointly limit the spiral air outlet cavity.

[0018] In one of the embodiments, the spiral air outlet groove is arc-shaped.

[0019] In one of the embodiments, the depth of the annular air distribution groove is greater than the depth of the spiral air outlet groove, and the width of the annular air distribution groove is greater than the width of the spiral air outlet groove.

[0020] In one of the embodiments, the first connecting piece and the second connecting piece are both flanges.

[0021] In one of the embodiments, the positive pressure pneumatic conveying device further comprises an air source conveying assembly, the air source conveying assembly is communicated with the positive pressure cavity, the spiral air outlet cavity and the reverse blowing channel respectively.

[0022] In one of the embodiments, the air source conveying assembly comprises:

[0023] a main pipeline, the input end of the main pipeline is used for communicating with an external air source, and the output end of the main pipeline is communicated with the positive pressure cavity;

[0024] a spiral air supplement pipeline, the input end of the spiral air supplement pipeline is communicated with the main pipeline, and the output end of the spiral air supplement pipeline is communicated with the spiral air outlet cavity;

[0025] a reverse blowing air supplement pipeline, the input end of the reverse blowing channel is communicated with the main pipeline, and the output end of the reverse blowing air supplement pipeline is communicated with the reverse blowing channel; and

[0026] a total control valve arranged on the input end of the main pipeline.

[0027] In one of the embodiments, the gas source delivery assembly further comprises a spiral air supplement control valve and a reverse blowing air supplement control valve, the spiral air supplement control valve is arranged on the spiral air supplement pipeline, and the reverse blowing air supplement control valve is arranged on the reverse blowing air supplement pipeline.

[0028] A positive pressure pneumatic conveying method for conveying the powder by the positive pressure pneumatic conveying equipment according to any one of the embodiments, the positive pressure pneumatic conveying method comprising:

[0029] Conveying the powder to the positive pressure cavity;

[0030] Introducing the positive pressure into the positive pressure cavity until the air pressure in the positive pressure cavity reaches a preset value, and the output end of the elbow pipe is used for communicating with the outside when the positive pressure is introduced;

[0031] Introducing the positive pressure into the spiral air outlet cavity and the reverse blowing channel.

[0032] Compared with the prior art, the present disclosure has at least the following advantages:

[0033] 1. When the positive pressure pneumatic conveying equipment is working, the external gas source is introduced into the positive pressure cavity, so that the powder in the positive pressure cavity is suspended and discharged outside in turn through the material passing channel and the conveying channel; the external gas source is also introduced into the spiral air outlet cavity, so that the spiral air outlet cavity sprays the spiral airflow into the material passing channel, the spiral airflow sweeps the inner wall of the material passing channel, so that the powder on the inner wall of the material passing channel is better mixed with the gas, and the powder on the inner wall of the material passing channel is suspended; when the airflow of the positive pressure cavity passes through the material passing channel, the airflow of the positive pressure cavity will take away the powder swept up by the spiral airflow, so as to avoid the problem of material deposition at the connection between the positive pressure dense phase tank and the elbow pipe.

[0034] 2. The external gas source is also introduced into the reverse blowing channel, so that the external gas source enters from the end of the spiral powder sweeping groove away from the positive pressure dense phase tank and flows towards the other end of the spiral powder sweeping groove, so that the external gas source sweeps the inner wall of the spiral powder sweeping groove, so that the powder in the spiral powder sweeping groove is better mixed with the gas and suspended; when the airflow of the positive pressure cavity passes through the conveying channel, the airflow of the positive pressure cavity will take away the airflow and powder flowing out of the spiral powder sweeping groove, so as to avoid the problem of powder deposition at the bottom of the elbow pipe. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1This is a schematic diagram of the structure of a positive pressure pneumatic conveying device according to one embodiment;

[0037] Figure 2 for Figure 1 Another structural schematic diagram of the positive pressure pneumatic conveying equipment shown;

[0038] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the positive pressure pneumatic conveying equipment along line AA.

[0039] Figure 4 for Figure 3 The diagram shown is an enlarged view of the positive pressure pneumatic conveying equipment at point B.

[0040] Figure 5 for Figure 1 The diagram shows a partial structural schematic of the positive pressure pneumatic conveying equipment.

[0041] Figure 6 for Figure 1 Another partial structural schematic diagram of the positive pressure pneumatic conveying equipment shown;

[0042] Figure 7 for Figure 1 Another partial structural schematic diagram of the positive pressure pneumatic conveying equipment shown;

[0043] Figure 8 for Figure 1 The diagram shows a cross-sectional view of the elbow pipe of the positive pressure pneumatic conveying equipment.

[0044] Reference numerals: Positive pressure pneumatic conveying equipment 10; Positive pressure dense phase tank 100; Positive pressure chamber 101; Elbow pipe 200; Conveying channel 201; Spiral powder sweeping trough 202; Backflush channel 203; Connecting assembly 300; First connector 310; First material passage hole 311; Air inlet 312; Annular air distribution groove 313; Spiral air outlet groove 314; Mounting hole 315; Second connector 320; Second material passage hole 321; Material passage channel 301; Spiral air outlet chamber 302; Pressure relief valve 330; Elastic barrier ring 340; Air source conveying assembly 400; Main pipeline 410; Spiral air replenishment pipeline 420; Main control valve 430; Spiral air replenishment control valve 440; Auxiliary jet cleaner 500. Detailed Implementation

[0045] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable the reader to gain a more thorough and complete understanding of the contents of this disclosure.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0049] like Figures 1 to 4 As shown, a positive pressure pneumatic conveying device 10 of one embodiment includes a positive pressure dense phase tank 100, an elbow pipe 200, and a connecting assembly 300. The positive pressure dense phase tank 100 forms a positive pressure chamber 101, and the elbow pipe 200 forms a conveying channel 201. The connecting assembly 300 is connected to the output end of the positive pressure dense phase tank 100 and the input end of the elbow pipe 200, respectively. The connecting assembly 300 has a material passage 301, and the positive pressure chamber 101 is connected to the conveying channel 201 through the material passage 301. In this embodiment, an external air source is introduced into the positive pressure chamber 101, causing the powder in the positive pressure chamber 101 to suspend, and the powder and airflow are sequentially conveyed to the outside through the material passage 301 and the conveying channel 201.

[0050] like Figure 4 and Figure 7 As shown, the connecting component 300 further includes a spiral air outlet chamber 302, which is connected to the material passage 301. The spiral air outlet chamber 302 is also used to connect with an external air source. When the external air source is introduced into the spiral air outlet chamber 302, the gas ejected from the spiral air outlet chamber 302 is spiral and sweeps across the inner wall of the material passage 301, so that the powder on the inner wall of the material passage 301 is better mixed with the gas, causing the powder on the inner wall of the material passage 301 to be suspended, so as to avoid the material settling on the inner wall of the material passage 301.

[0051] like Figure 8As shown, further, a spiral powder-sweeping trough 202 is provided on the bottom wall of the conveying channel 201. The spiral powder-sweeping trough 202 is located at the bend of the elbow pipe 200. A reverse blowing channel 203 is provided at the bottom of the elbow pipe 200. The reverse blowing channel 203 is connected to the end of the spiral powder-sweeping trough 202 away from the positive pressure dense phase tank 100. The extension direction of the reverse blowing channel 203 is towards the end of the spiral powder-sweeping trough 202 adjacent to the positive pressure dense phase tank 100. The reverse blowing channel 203 is also used to connect with an external air source. After the external air source passes through the reverse blowing channel 203, the external air source enters from the end of the spiral powder-sweeping trough 202 away from the positive pressure dense phase tank 100 and flows towards the other end of the spiral powder-sweeping trough 202, so that the external air source sweeps across the inner wall of the spiral powder-sweeping trough 202, causing the powder and gas in the spiral powder-sweeping trough 202 to mix and suspend better.

[0052] In the aforementioned positive pressure pneumatic conveying device 10, when the device is in operation, an external air source is introduced into the positive pressure chamber 101, causing the powder inside the positive pressure chamber 101 to suspend and be discharged to the outside through the material passage 301 and the conveying passage 201 in sequence. The external air source is also introduced into the spiral air outlet chamber 302, causing the spiral air outlet chamber 302 to spray a spiral airflow into the material passage 301. The spiral airflow sweeps across the inner wall of the material passage 301, allowing the powder on the inner wall of the material passage 301 to mix better with the gas, causing the powder on the inner wall of the material passage 301 to suspend. When the airflow in the positive pressure chamber 101 passes through the material passage 301, the airflow in the positive pressure chamber 101 will carry away the powder swept up by the spiral airflow, thus preventing the powder from settling on the inner wall of the material passage 301. An external air source is also introduced into the reverse blowing channel 203, allowing the external air source to enter from the end of the spiral powder sweeping trough 202 away from the positive pressure dense phase tank 100 and flow towards the other end of the spiral powder sweeping trough 202. This causes the external air source to sweep across the inner wall of the spiral powder sweeping trough 202, resulting in better mixing and suspension of the powder and gas within the spiral powder sweeping trough 202. When the airflow in the positive pressure chamber 101 passes through the conveying channel 201, the airflow in the positive pressure chamber 101 will carry away the airflow and powder flowing out of the spiral powder sweeping trough 202, thus preventing powder from settling at the bottom of the elbow pipe 200. In this way, the spiral airflow ejected through the spiral air outlet chamber 302 avoids the problem of material settling at the connection between the positive pressure dense phase tank 100 and the elbow pipe 200, and the airflow ejected through the reverse blowing airflow avoids the problem of material settling at the bottom of the elbow pipe 200.

[0053] like Figure 4As shown, in one embodiment, the connecting component 300 includes a first connector 310 and a second connector 320. The first connector 310 is fixedly connected to the output end of the positive pressure dense phase tank 100, and the second connector 320 is fixedly connected to the input end of the elbow pipe 200. The first connector 310 and the second connector 320 are fixedly connected. The first connector 310 has a first material passage hole 311, and the second connector 320 has a second material passage hole 321. The first material passage hole 311 and the second material passage hole 321 are connected and together form a material passage channel 301.

[0054] like Figure 5 and Figure 6 As shown, in one embodiment, an air inlet 312 is provided on the outer side of the first connector 310 for connecting to an external air source. An annular air distribution groove 313 and a spiral air outlet groove 314 are provided on the side of the first connector 310 adjacent to the second connector 320. The annular air distribution groove 313 is connected to the air inlet 312. Multiple spiral air outlet grooves 314 are spaced apart and arranged in an array along the circumference of the annular air distribution groove 313. The two ends of the spiral air outlet grooves 314 are connected to the annular air distribution groove 313 and the first material passage hole 311, respectively. The inner wall of the spiral air outlet groove 314 and the second connector 320 adjacent to the first connector 310 together form a spiral air outlet cavity 302.

[0055] like Figure 5 and Figure 6 As shown, in this embodiment, the external air source enters the material passage 301 sequentially through the air inlet 312, the annular air distribution groove 313, and the spiral air outlet 302. Specifically, the external air source enters the annular air distribution groove 313 through the air inlet 312. The external air source flows within the annular air distribution groove 313. When the airflow in the annular air distribution groove 313 passes through the spiral air outlet groove 314, the airflow in the annular air distribution groove 313 will enter the spiral air outlet groove 314. That is, the airflow in the annular air distribution groove 313 will be distributed to multiple spiral air outlet grooves 314, so that the external air source enters the first material passage 311 through the spiral air outlet groove 314. After the external air source enters the first material passage 311, it will form a spiral airflow in the material passage 301. The spiral airflow sweeps across the inner wall of the material passage 301, suspending the powder on the inner wall of the material passage 301, so as to avoid the problem of powder deposition on the inner wall of the material passage 301. It is understandable that the annular gas distribution groove 313 is annular and distributes the external gas source to multiple spiral gas outlet grooves 314.

[0056] like Figure 6 As shown, in one embodiment, the spiral air outlet groove 314 is arc-shaped, so that after the external air source flows out through the spiral air outlet groove 314, a spiral airflow can be formed in the material passage 301. Of course, in other embodiments, the spiral air outlet groove 314 can be a rectangular groove or other existing airflow chambers capable of ejecting spiral airflow.

[0057] like Figure 5 As shown, in one embodiment, the depth of the annular gas distribution groove 313 is greater than the depth of the spiral gas outlet groove 314, and the width of the annular gas distribution groove 313 is greater than the width of the spiral gas outlet groove 314, so that the gas storage capacity of the annular gas distribution groove 313 is larger, which is beneficial for the annular gas distribution groove 313 to quickly distribute the gas into the multiple spiral gas outlet grooves 314.

[0058] like Figure 4 As shown, in one embodiment, both the first connector 310 and the second connector 320 are flanges.

[0059] like Figures 1 to 3 As shown, in one embodiment, the positive pressure pneumatic conveying device 10 further includes an air source conveying assembly 400, which is connected to the positive pressure chamber 101, the spiral air outlet chamber 302, and the reverse blowing channel 203. In this embodiment, external compressed air is conveyed to the positive pressure chamber 101, the spiral air outlet chamber 302, and the reverse blowing channel 203 through the air source conveying assembly 400.

[0060] like Figure 1 As shown, in one embodiment, the air supply delivery assembly 400 includes a main pipe 410, a spiral air supply pipe 420, a backflush air supply pipe (not shown), and a main control valve 430. The input end of the main pipe 410 is connected to an external air source, and the output end of the main pipe 410 is connected to the positive pressure chamber 101. The input end of the spiral air supply pipe 420 is connected to the main pipe 410, and the output end of the spiral air supply pipe 420 is connected to the spiral air outlet chamber 302. The input end of the backflush channel 203 is connected to the main pipe 410, and the output end of the backflush air supply pipe (not shown) is connected to the backflush channel 203. The main control valve 430 is located at the input end of the main pipe 410.

[0061] like Figure 1 As shown, in one embodiment, the gas supply delivery assembly 400 further includes a spiral gas supply control valve 440 and a backflush gas supply control valve (not shown). The spiral gas supply control valve 440 is disposed on the spiral gas supply pipeline 420, and the backflush gas supply control valve (not shown) is disposed on the backflush gas supply pipeline (not shown).

[0062] like Figure 3 As shown, this disclosure also provides a positive pressure pneumatic conveying method, in which powder is conveyed through the positive pressure pneumatic conveying device 10 of any of the above embodiments. The positive pressure pneumatic conveying method includes:

[0063] S100: The powder is conveyed to the positive pressure chamber 101. The density of the powder is 2 g / cm³. 3 Up to 8g / cm 3 .

[0064] In this embodiment, the density of the powder is 2 g / cm³. 3 Up to 8g / cm 3 This results in high viscosity of the powder. The powder can be ceramic powder, calcium carbonate powder, talc powder, or other existing materials with a density of 2 g / cm³. 3 Up to 8g / cm 3 The powder.

[0065] S300: Positive pressure is introduced into the positive pressure chamber 101 until the air pressure inside the positive pressure chamber 101 reaches a preset value. The output end of the elbow pipe 200 is used to connect with the outside when positive pressure is introduced. In this embodiment, the preset value is 140 kPa to 160 kPa.

[0066] It should be noted that when the air pressure inside the positive pressure chamber 101 exceeds the preset value, the gas discharge rate exceeds the powder discharge rate, causing the powder to be unable to be discharged in time, resulting in powder blockage at the outlet of the positive pressure chamber 101. When the air pressure inside the positive pressure chamber 101 is less than the preset value, the powder will not be able to suspend sufficiently, also leading to powder blockage at the outlet of the positive pressure chamber 101. In practical applications, when positive pressure is introduced into the positive pressure chamber 101, if the connection between the output end of the elbow pipe 200 and the outside is cut off, the pressure inside the positive pressure chamber 101 will immediately exceed the preset value. That is, the pressure inside the positive pressure chamber 101 will reach the preset value relatively quickly, preventing the operator and existing detection device from opening the connection between the output end of the elbow pipe 200 and the outside in time. This results in uncontrolled air pressure in the positive pressure chamber 101, causing the air pressure inside the positive pressure chamber 101 to exceed the preset value, thus causing powder blockage. Therefore, in this embodiment, when positive pressure is introduced into the positive pressure chamber 101, the output end of the elbow pipe 200 is connected to the outside, avoiding the problem of rapid pressure rise in the positive pressure chamber 101, and thus avoiding the problem of uncontrolled pressure rise in the positive pressure chamber 101. In related technologies, due to the low density of the powder, the connection between the elbow pipe 200 and the outside is often opened only after the air pressure in the positive pressure chamber 101 reaches a preset value.

[0067] It should also be noted that the intake speed of the positive pressure chamber 101 is greater than the exhaust speed of the positive pressure chamber 101, so the air pressure in the positive pressure chamber 101 can gradually rise to the preset value.

[0068] S500: Positive pressure is introduced into the spiral outlet chamber 302 and the backflush channel 203.

[0069] In this embodiment, positive pressure is introduced into the spiral air outlet chamber 302, causing the spiral air outlet chamber 302 to spray spiral airflow into the material passage 301. The spiral airflow sweeps across the inner wall of the material passage 301, allowing the powder on the inner wall of the material passage 301 to mix better with the gas, causing the powder on the inner wall of the material passage 301 to be suspended. When the airflow of the positive pressure chamber 101 passes through the material passage 301, the airflow of the positive pressure chamber 101 will carry away the powder swept up by the spiral airflow, so as to avoid the material settling on the inner wall of the material passage 301. Positive pressure is introduced into the reverse blowing channel 203, so that the external air source, i.e., compressed air, enters from the end of the spiral powder sweeping tank 202 away from the positive pressure dense phase tank 100 and flows towards the other end of the spiral powder sweeping tank 202. This causes the external air source to sweep across the inner wall of the spiral powder sweeping tank 202, resulting in better mixing and suspension of the powder and gas in the spiral powder sweeping tank 202. When the airflow in the positive pressure chamber 101 passes through the conveying channel 201, the airflow in the positive pressure chamber 101 will carry away the airflow and powder flowing out of the spiral powder sweeping tank 202, so as to avoid the deposition of powder at the bottom of the elbow pipe 200.

[0070] It should be noted that in practical applications, if positive pressure is simultaneously introduced into the positive pressure chamber 101, and also into the spiral air outlet chamber 302 and the reverse blowing channel 203, the spiral air outlet chamber 302 is located adjacent to the elbow pipe 200, and the reverse blowing channel 203 is located within the elbow pipe 200. This results in faster exhaust from the conveying channel 201 of the elbow pipe 200, which in turn leads to faster exhaust from the positive pressure chamber 101. Consequently, it takes longer for the air pressure in the positive pressure chamber 101 to reach the preset value, which is detrimental to improving conveying efficiency. Therefore, in this embodiment, positive pressure is only introduced into the spiral air outlet chamber 302 and the reverse blowing channel 203 after the air pressure in the positive pressure chamber 101 has reached the preset value.

[0071] In the aforementioned positive pressure pneumatic conveying method, when the positive pressure pneumatic conveying equipment 10 is working, an external air source is introduced into the positive pressure chamber 101, causing the powder inside the positive pressure chamber 101 to suspend and be discharged to the outside sequentially through the material passage 301 and the conveying passage 201; the external air source is also introduced into the spiral air outlet chamber 302, causing the spiral air outlet chamber 302 to spray spiral airflow into the material passage 301. The spiral airflow sweeps across the inner wall of the material passage 301, allowing the powder on the inner wall of the material passage 301 to mix better with the gas, causing the powder on the inner wall of the material passage 301 to suspend. When the airflow in the positive pressure chamber 101 passes through the material passage 301, the positive pressure chamber 101... The airflow carries away the powder swept up by the spiral airflow, preventing material from settling on the inner wall of the material passage 301. An external air source is also introduced into the reverse blowing channel 203, allowing the external air source to enter from the end of the spiral powder sweeping trough 202 away from the positive pressure dense phase tank 100 and flow towards the other end of the spiral powder sweeping trough 202. This causes the external air source to sweep across the inner wall of the spiral powder sweeping trough 202, resulting in better mixing and suspension of the powder and gas within the spiral powder sweeping trough 202. When the airflow from the positive pressure chamber 101 passes through the conveying channel 201, the airflow from the positive pressure chamber 101 carries away the airflow and powder flowing out of the spiral powder sweeping trough 202, preventing powder from settling at the bottom of the elbow pipe 200. Thus, the spiral airflow ejected through the spiral outlet chamber 302 prevents material settling at the connection between the positive pressure dense phase tank 100 and the elbow pipe 200, while the airflow ejected through the reverse blowing prevents material settling at the bottom of the elbow pipe 200.

[0072] Furthermore, when positive pressure is introduced into the positive pressure chamber 101, the output end of the elbow pipe 200 is connected to the outside, allowing the elbow pipe 200 to exhaust air when positive pressure is introduced into the positive pressure chamber 101. This avoids the problem of rapid pressure rise in the positive pressure chamber 101, and thus prevents the problem of uncontrolled pressure rise in the positive pressure chamber 101. Only after the air pressure in the positive pressure chamber 101 reaches the preset value is positive pressure introduced into the spiral air outlet chamber 302 and the reverse blowing channel 203, avoiding the problem of excessive exhaust speed in the positive pressure chamber 101 and improving the powder conveying efficiency.

[0073] It is understandable that since an external air source enters the material passage 301 through the air inlet 312, the annular air distribution groove 313 and the spiral air outlet 302 in sequence, when positive pressure is introduced into the positive pressure chamber 101 and the air pressure in the positive pressure chamber 101 has not reached the preset value, since the spiral air outlet 302 has not yet been introduced with positive pressure, the airflow in the positive pressure chamber 101 will blow the powder into the annular air distribution groove 313. Since the annular gas distribution groove 313 of the spiral gas outlet chamber 302 is annular, and the depth of the annular gas distribution groove 313 is greater than the depth of the spiral gas outlet groove 314, and the annular gas distribution groove 313 is connected to the material passage 301 through the spiral gas outlet groove 314, that is, the annular gas distribution groove 313 is not directly connected to the material passage 301. Even if positive pressure is introduced into the spiral gas outlet chamber 302 from behind, the powder in the annular gas distribution groove 313 is still difficult to be completely discharged. That is, there is still powder residue in the annular gas distribution groove 313, which means that there is still room for improvement in metering accuracy.

[0074] To further improve measurement accuracy, such as Figure 4 As shown, in one embodiment, the first connector 310 has a plurality of mounting holes 315 communicating with the annular gas distribution groove 313. The plurality of mounting holes 315 are spaced apart and arranged around the annular gas distribution groove 313 in a circumferential manner. The mounting holes 315 extend to the inner wall of the first material passage hole 311. The connecting assembly 300 also has a plurality of pressure relief valves 330. The plurality of pressure relief valves 330 are installed one-to-one in the mounting holes 315, and each pressure relief valve 330 is sealed to the inner wall of the mounting hole 315. In this embodiment, after the powder in the positive pressure chamber 101, the material passage 301, and the conveying passage 201 is discharged, the air pressure introduced through the air inlet 312 is increased, so that the air pressure value of the annular air distribution groove 313 reaches the threshold of the pressure relief valve 330, causing the pressure relief valve 330 to open, so that the annular air distribution groove 313 is connected to the first material passage 311. The powder in the annular air distribution groove 313 is discharged to the material passage 301 through multiple pressure relief valves 330, so that the airflow in the positive pressure chamber 101 drives the powder to be discharged to the outside, reducing the accumulation of material in the annular air distribution groove 313 and improving the metering accuracy.

[0075] like Figure 3 and Figure 4 As shown, in one embodiment, after the step of introducing positive pressure into the spiral outlet chamber 302 and the reverse blowing channel 203, the positive pressure pneumatic delivery method further includes:

[0076] S500: After the powder in the positive pressure chamber 101, the material passage 301 and the conveying passage 201 are discharged, the air pressure introduced into the air inlet 312 is increased, causing the pressure relief valve 330 to open, thereby allowing the powder in the annular air distribution groove 313 to be discharged to the material passage 301 through multiple pressure relief valves 330.

[0077] like Figure 3 and Figure 4As shown, in this embodiment, after the powder in the positive pressure chamber 101, the material passage 301, and the conveying passage 201 is discharged, the air pressure introduced through the air inlet 312 is increased, so that the air pressure value of the annular air distribution groove 313 reaches the threshold of the pressure relief valve 330, causing the pressure relief valve 330 to open, so that the annular air distribution groove 313 is connected to the first material passage 311. The powder in the annular air distribution groove 313 is discharged to the material passage 301 through multiple pressure relief valves 330, so that the airflow in the positive pressure chamber 101 drives the powder to be discharged to the outside, reducing the accumulation of material in the annular air distribution groove 313 and improving the metering accuracy.

[0078] It is important to emphasize that when the pressure relief valve 330 releases air, the airflow discharged from the pressure relief valve 330 will interfere with the airflow ejected from the spiral air outlet chamber 302, causing the spiral airflow to fail to form and resulting in the inability to remove the sediment at the bottom of the elbow pipe 200. Therefore, in this embodiment, the air pressure introduced into the air inlet 312 is increased only after the powder in the positive pressure chamber 101, the material passage 301, and the conveying passage 201 has been completely discharged.

[0079] like Figure 6 As shown, it can be understood that after the airflow from the air inlet 312 is discharged, the airflow will be divided into two annular airflows. The two annular airflows will merge at a certain position, causing the two annular airflows to collide with each other, resulting in a loss of air force, which in turn leads to a decrease in the flow rate of the annular airflows. Ultimately, this leads to a decrease in the flow rate of the spiral air outlet 302, which is not conducive to the anti-sinking effect of the spiral airflow.

[0080] To solve the above problems, such as Figure 7 As shown, in one embodiment, the connecting assembly 300 further includes an elastic barrier ring 340, which fills a portion of the annular air distribution groove 313. The elastic barrier ring 340 is disposed adjacent to the air inlet 312 and is located between two adjacent spiral air outlet grooves 314. The elastic barrier ring 340 also abuts against the side of the second connector 320 adjacent to the first connector 310.

[0081] like Figure 7 As shown, in this embodiment, the elastic barrier ring 340 fills a portion of the annular air distribution groove 313, thus blocking the airflow through that portion. Because the elastic barrier ring 340 is positioned adjacent to the air inlet 312, when external air passes through the air inlet 312, the airflow rotates in one direction, preventing the airflow discharged from the air inlet 312 from splitting into two surrounding airflows. This avoids airflow loss due to collision between the two airflows, increases the velocity of the spiral airflow, and thus improves the effect of preventing material from settling in the material passage 301. It can be understood that the elastic barrier ring 340 can be a silicone structure, a rubber structure, or other existing elastic sealing structures.

[0082] like Figure 3As shown, in one embodiment, the positive pressure pneumatic conveying device 10 further includes an auxiliary jet injector 500, which is fixedly connected to the output end of the elbow pipe 200 and communicates with the conveying channel 201. In this embodiment, the auxiliary jet injector 500 accelerates the conveying speed of the elbow pipe 200, thereby increasing the material conveying speed and avoiding the problem of material blockage due to the slow feeding speed of the elbow pipe 200.

[0083] like Figure 3 As shown, further, in the step of introducing positive pressure into the spiral air outlet chamber 302 and the reverse blowing channel 203, the auxiliary blower 500 is also activated to accelerate the material conveying speed of the elbow pipe 200.

[0084] Compared with the prior art, this disclosure has at least the following advantages:

[0085] 1. When the positive pressure pneumatic conveying equipment 10 is working, an external air source is introduced into the positive pressure chamber 101, causing the powder in the positive pressure chamber 101 to be suspended and discharged to the outside through the material passage 301 and the conveying passage 201 in sequence; the external air source is also introduced into the spiral air outlet chamber 302, causing the spiral air outlet chamber 302 to spray spiral airflow into the material passage 301. The spiral airflow sweeps across the inner wall of the material passage 301, making the powder on the inner wall of the material passage 301 mix better with the gas, causing the powder on the inner wall of the material passage 301 to be suspended. When the airflow in the positive pressure chamber 101 passes through the material passage 301, the airflow in the positive pressure chamber 101 will carry away the powder swept up by the spiral airflow, so as to avoid the material settling on the inner wall of the material passage 301, that is, to avoid the problem of material settling at the connection between the positive pressure dense phase tank 100 and the elbow pipe 200.

[0086] 2. An external air source is also introduced into the reverse blowing channel 203, so that the external air source enters from the end of the spiral powder sweeping tank 202 away from the positive pressure dense phase tank 100 and flows towards the other end of the spiral powder sweeping tank 202, so that the external air source sweeps across the inner wall of the spiral powder sweeping tank 202, causing the powder and gas in the spiral powder sweeping tank 202 to mix and suspend better. When the airflow of the positive pressure chamber 101 passes through the conveying channel 201, the airflow of the positive pressure chamber 101 will carry away the airflow and powder flowing out of the spiral powder sweeping tank 202, so as to avoid the problem of powder deposition at the bottom of the elbow pipe 200.

[0087] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A positive pressure pneumatic conveying device, comprising a positive pressure dense phase tank, an elbow pipe, and a connecting assembly, wherein the positive pressure dense phase tank forms a positive pressure chamber, the elbow pipe forms a conveying channel, the connecting assembly is connected to the output end of the positive pressure dense phase tank and the input end of the elbow pipe respectively, the connecting assembly has a material passage, and the positive pressure chamber is connected to the conveying channel through the material passage; Its features are, The connecting assembly forms a spiral air outlet chamber, which is connected to the material passage and is also used to connect with an external air source. The bottom wall of the conveying channel is provided with a spiral powder sweeping groove, which is located at the bend of the elbow pipe. The bottom of the elbow pipe is provided with a reverse blowing channel, which is connected to the end of the spiral powder sweeping groove away from the positive pressure dense phase tank. The extension direction of the reverse blowing channel is towards the end of the spiral powder sweeping groove adjacent to the positive pressure dense phase tank. The reverse blowing channel is also used to connect with an external air source. The connecting assembly includes a first connector and a second connector. The first connector is fixedly connected to the output end of the positive pressure dense phase tank, and the second connector is fixedly connected to the input end of the elbow pipe. The first connector and the second connector are fixedly connected. The first connector has a first material passage hole, and the second connector has a second material passage hole. The first material passage hole and the second material passage hole are connected and together form the material passage channel. An air inlet is provided on the outer side of the first connector, which is used to connect with the external air source. An annular air distribution groove and a spiral air outlet groove are provided on the side of the first connector adjacent to the second connector. The annular air distribution groove is connected to the air inlet. A plurality of spiral air outlet grooves are arranged in an array at intervals along the circumference of the annular air distribution groove. The two ends of the spiral air outlet groove are respectively connected to the annular air distribution groove and the first material passage hole. The inner wall of the spiral air outlet groove and the second connector adjacent to the first connector together limit the spiral air outlet cavity.

2. The positive pressure pneumatic conveying equipment according to claim 1, characterized in that, The spiral air outlet groove is arc-shaped.

3. The positive pressure pneumatic conveying equipment according to claim 1, characterized in that, The depth of the annular gas distribution groove is greater than the depth of the spiral gas outlet groove, and the width of the annular gas distribution groove is greater than the width of the spiral gas outlet groove.

4. The positive pressure pneumatic conveying equipment according to claim 1, characterized in that, Both the first connector and the second connector are flanges.

5. The positive pressure pneumatic conveying equipment according to claim 1, characterized in that, The positive pressure pneumatic conveying equipment also includes an air source conveying component, which is connected to the positive pressure chamber, the spiral air outlet chamber and the reverse blowing channel respectively.

6. The positive pressure pneumatic conveying equipment according to claim 5, characterized in that, The gas supply delivery assembly includes: The main pipeline has an input end that is connected to an external air source and an output end that is connected to the positive pressure chamber. A spiral air supply pipe, wherein the input end of the spiral air supply pipe is connected to the main pipe, and the output end of the spiral air supply pipe is connected to the spiral air outlet chamber; A backflush air supply pipeline, wherein the input end of the backflush channel is connected to the main pipeline, and the output end of the backflush air supply pipeline is connected to the backflush channel; and The main control valve is located at the inlet end of the main pipeline.

7. The positive pressure pneumatic conveying equipment according to claim 6, characterized in that, The gas supply delivery assembly also includes a spiral gas supply control valve and a backflush gas supply control valve. The spiral gas supply control valve is installed on the spiral gas supply pipeline, and the backflush gas supply control valve is installed on the backflush gas supply pipeline.

8. A positive pressure pneumatic conveying method, characterized in that, The positive pressure pneumatic conveying method comprises conveying powder using the positive pressure pneumatic conveying equipment according to any one of claims 1 to 7, wherein the positive pressure pneumatic conveying method includes: The powder is conveyed into the positive pressure chamber; Positive pressure is introduced into the positive pressure chamber until the air pressure in the positive pressure chamber reaches a preset value. The output end of the elbow pipe is used to connect with the outside when positive pressure is introduced. Positive pressure is introduced into the spiral air outlet chamber and the reverse blowing channel.

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