A powder and granular material conveying device

Abstract

The present application provides a powder and granular material conveying device, which includes a first conveying tank, a second conveying tank and a flow regulating valve; the first conveying tank is arranged at the top of the second conveying tank, and the bottom end of the first conveying tank is communicated with the top end of the second conveying tank; a first feed valve is arranged at the opening at the top end of the first conveying tank, and a second feed valve is arranged at the communication part between the first conveying tank and the second conveying tank; the flow regulating valve includes an outer cylinder and a rotor, the outer cylinder is horizontally arranged, and the outer cylinder has a powder channel vertically penetrating the outer cylinder, the top end of the powder channel is communicated with the bottom end of the second conveying tank, and end covers are respectively arranged at the left and right ends of the outer cylinder; the rotor is arranged inside the outer cylinder, the rotor includes a rotating shaft and an impeller, the rotating shaft is rotatably connected between the end covers at the left and right ends of the outer cylinder; the impeller is sleeved on the rotating shaft, and the impeller is located inside the powder channel. The conveying device can achieve uniform discharging through the impeller. After the material and the conveying medium are fully mixed in the bottom fluidizer, the precise, stable and continuous conveying of the powder and granular material under high pressure is realized under the action of the pressure difference.

Description

Technical Field

[0001] This application relates to the technical field of pneumatic conveying, and particularly to a powder and granular material conveying device. Background Art

[0002] Pneumatic conveying, also known as air conveying, utilizes the energy of air flow to convey powder or granular materials along the air flow direction in a closed pipeline. It is a specific application of fluidization technology and is widely used in related fields such as thermal power, chemical industry, and food.

[0003] Existing pneumatic conveying equipment usually cuts off the ash inlet through an electric valve or a pneumatic valve. When the electric valve or the pneumatic valve is opened, the powder and granular materials fall naturally under gravity, and it is impossible to ensure the accurate, stable, and continuous conveying of the materials. Summary of the Invention

[0004] An embodiment of this application provides a powder and granular material conveying device, which includes a first conveying tank, a second conveying tank, and a flow regulating valve; the first conveying tank is arranged at the top of the second conveying tank, and the bottom end of the first conveying tank is communicated with the top end of the second conveying tank;

[0005] A first feed valve is provided at the top opening of the first conveying tank, and a second feed valve is provided at the communication part between the first conveying tank and the second conveying tank;

[0006] The flow regulating valve includes an outer cylinder and a rotor. The outer cylinder is horizontally arranged, and the outer cylinder has a powder channel vertically penetrating the outer cylinder. The top end of the powder channel is communicated with the bottom end of the second conveying tank, and end covers are respectively provided at the left and right ends of the outer cylinder;

[0007] The rotor is arranged inside the outer cylinder. The rotor includes a rotating shaft and an impeller. The rotating shaft is rotatably connected between the end covers at the left and right ends of the outer cylinder; the impeller is sleeved on the rotating shaft, and the impeller is located inside the powder channel.

[0008] In the powder and granular material conveying device provided by the embodiment of this application, when there is no need to convey materials, the rotor is in a static state, and the materials in the second conveying tank are blocked by the impeller and cannot fall, and the powder channel is in a closed state. When it is necessary to convey materials, the rotor is driven by a reduction motor to rotate inside the powder channel. The materials fall into the trough outside the impeller and are poured into the fluidizer along with the trough. After the materials are fully mixed with the conveying medium in the bottom fluidizer, the accurate, stable, and continuous conveying of the powder and granular materials under high pressure is realized under the action of the pressure difference. In this way, the conveying frequency of the trough on the impeller and the second conveying tank can be controlled by adjusting the rotation speed of the rotor, so as to achieve the accurate and stable conveying of the materials.

[0009] A first conveying tank is provided at the top of the second conveying tank. When the material in the second conveying tank is about to be conveyed out and needs to be replenished, the second feed valve is controlled to close the top opening of the second conveying tank, isolating the second conveying tank from the first conveying tank, and discharging the gas in the first conveying tank to make the first conveying tank at normal pressure or low pressure. This can prevent the high-pressure gas in the first conveying tank from entering the material storage bin and blowing the material in the material storage bin, facilitating the material to enter the first conveying tank. Then, the first feed valve is controlled to open the top opening of the first conveying tank, so that the powder material in the material storage bin falls into the first conveying tank. Then, the first feed valve is controlled to close the top opening of the first conveying tank, and the first conveying tank is inflated and pressurized to make the air pressure in the first conveying tank balance with the air pressure in the second conveying tank. Finally, the second feed valve is controlled to open the top opening of the second conveying tank, so that the material in the first conveying tank falls into the second conveying tank, thus completing the replenishment of the material in the second conveying tank, and realizing the continuous conveying of the material under high-pressure conditions.

[0010] In one possible implementation manner, for the powder material conveying device provided by the embodiment of the present application, the powder material conveying device further includes an exhaust system. The exhaust system includes a first exhaust valve communicated with the first conveying tank and a second exhaust valve communicated with the second conveying tank, and both the first exhaust valve and the second exhaust valve are communicated with an exhaust pipeline.

[0011] In one possible implementation manner, for the powder material conveying device provided by the embodiment of the present application, the powder material conveying device further includes a voltage stabilizing system. The voltage stabilizing system includes a first pressure balance valve communicated with the first conveying tank and a second pressure balance valve communicated with the second conveying tank, and both the first pressure balance valve and the second pressure balance valve are communicated with a gas source pipeline.

[0012] In one possible implementation manner, for the powder material conveying device provided by the embodiment of the present application, a protective shell is provided at the bottom of the second conveying tank, and an opening is provided at the bottom of the protective shell; the middle part of the outer cylinder is located inside the protective shell, and the left and right ends of the outer cylinder respectively penetrate through the protective shell, and the powder material channel is located in the protective shell.

[0013] In one possible implementation manner, for the powder material conveying device provided by the embodiment of the present application, a fluidizer is installed on the opening of the protective shell. One end of the fluidizer is communicated with a gas source pipeline, and the other end of the fluidizer is communicated with a target storage bin.

[0014] In one possible implementation manner, for the powder material conveying device provided by the embodiment of the present application, the shape of the protective shell is conical.

[0015] In one possible implementation, for the powder and granular material conveying device provided by the embodiments of the present application, an installation groove is provided at the outer end of the end cover, and a sealing groove is provided at the inner end of the end cover. The installation groove communicates with the sealing groove;

[0016] A bearing is provided in the installation groove. Both ends of the rotating shaft pass through the sealing grooves of the two end covers respectively and are connected to the bearings in the installation groove; a fluororubber oil seal is provided between the sealing groove and the rotating shaft. A dust-proof cover plate is provided outside the installation groove. One end of the rotating shaft passes through the dust-proof cover plate and is connected to a reduction motor.

[0017] In one possible implementation, for the powder and granular material conveying device provided by the embodiments of the present application, a rubber expansion joint is provided at the top of the first feed valve, and a rubber expansion joint is provided between the second feed valve and the first conveying tank.

[0018] In one possible implementation, for the powder and granular material conveying device provided by the embodiments of the present application, level gauges are installed on both the first conveying tank and the second conveying tank.

[0019] In one possible implementation, for the powder and granular material conveying device provided by the embodiments of the present application, a pressure transmitter is installed on the second conveying tank. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the powder and granular material conveying device provided by the embodiments of the present application;

[0022] Figure 2 It is a schematic structural diagram of the second conveying tank in the powder and granular material conveying device provided by the embodiments of the present application;

[0023] Figure 3 is Figure 2 an enlarged schematic view of part A in;

[0024] Figure 4 It is a schematic structural diagram of the end cover in the powder and granular material conveying device provided by the embodiments of the present application;

[0025] Figure 5 It is a relationship diagram of the powder and granular material conveying device provided by the embodiments of the present application and related equipment.

[0026] Description of the Reference Numerals

[0027] 10 - First transfer tank;

[0028] 11 - First feed valve;

[0029] 12 - First exhaust valve;

[0030] 13 - First pressure balance valve;

[0031] 20 - Second transfer tank;

[0032] 21 - Second feed valve;

[0033] 22 - Second exhaust valve;

[0034] 23 - Second pressure balance valve;

[0035] 30 - Flow regulating valve;

[0036] 31 - Outer cylinder;

[0037] 31a - Powder channel;

[0038] 32 - Rotor;

[0039] 321 - Shaft;

[0040] 322 - Impeller;

[0041] 33 - End cover;

[0042] 331 - Mounting groove;

[0043] 332 - Sealing groove;

[0044] 34 - Bearing;

[0045] 35 - Fluoroelastomer oil seal;

[0046] 36 - Dust-proof cover plate;

[0047] 40 - Protection shell;

[0048] 50 - Fluidizer;

[0049] 60 - Reduction motor;

[0050] 70 - Rubber expansion joint;

[0051] 80 - Level gauge;

[0052] 90 - Pressure transmitter;

[0053] 100 - Exhaust pipeline;

[0054] 110 - Gas source pipeline;

[0055] 120 - Material storage bin;

[0056] 120 - Air compressor unit;

[0057] 130 - Gas storage tank;

[0058] 140 - Target storage bin. Detailed implementation manners

[0059] Pneumatic conveying, also known as air conveying, utilizes the energy of air flow to convey powder or granular materials along the air flow direction in a closed pipeline. It is a specific application of fluidization technology and is widely used in related fields such as thermal power, chemical industry, and food.

[0060] Existing pneumatic conveying equipment usually cuts off the ash inlet through an electric valve or a pneumatic valve. When the electric valve or the pneumatic valve is opened, the powder and granular materials fall naturally under gravity, and it is impossible to ensure the accurate, stable, and continuous conveying of the materials.

[0061] Based on this, the embodiment of the present application provides a powder and granular material conveying device, which can realize the accurate, stable, and continuous conveying of materials under high-pressure conditions by setting a flow regulating valve and a first conveying tank.

[0062] To make the purpose, technical solution, and advantages of the present application clearer, the technical solution in the embodiment of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0063] Figure 1 It is a schematic structural diagram of the powder and granular material conveying device provided by the embodiment of the present application; Figure 2 It is a schematic structural diagram of the second conveying tank in the powder and granular material conveying device provided by the embodiment of the present application; Figure 3 is Figure 2 an enlarged schematic view of part A in Figure 4 It is a schematic structural diagram of the end cover in the powder and granular material conveying device provided by the embodiment of the present application; Figure 5 It is a relationship diagram of the powder and granular material conveying device provided by the embodiment of the present application and related equipment.

[0064] See Figures 1 - 5 As shown in , the embodiment of the present application provides a powder and granular material conveying device, including a first conveying tank 10, a second conveying tank 20, and a flow regulating valve 30, wherein:

[0065] The first conveying tank 10 is arranged at the top of the second conveying tank 20. A first feed valve 11 is provided at the top opening of the first conveying tank 10. The first feed valve 11 is communicated with the material storage bin 120. The first feed valve 11 is used to open and close the top opening of the first conveying tank 10, so as to control the powder material in the material storage bin 120 to enter the first conveying tank 10.

[0066] The bottom end of the first conveying tank 10 is communicated with the top end of the second conveying tank 20. A second feed valve 21 is provided at the communicating part between the first conveying tank 10 and the second conveying tank 20. The second feed valve 21 is used to open and close the top opening of the second conveying tank 20, so as to control the powder material in the first conveying tank 10 to enter the second conveying tank 20.

[0067] See Figure 3 As shown, the flow regulating valve 30 includes an outer cylinder 31 and a rotor 32. The outer cylinder 31 is horizontally arranged. The outer cylinder 31 has a powder material passage 31a vertically penetrating the outer cylinder 31. The top end of the powder material passage 31a is communicated with the bottom end of the second conveying tank 20. End covers 33 are respectively provided at the left and right ends of the outer cylinder 31. The end covers 33 are used to seal the two ends of the outer cylinder 31. The rotor 32 is arranged inside the outer cylinder 31. The rotor 32 includes a rotating shaft 321 and an impeller 322. The rotating shaft 321 is rotatably connected between the end covers 33 at the left and right ends of the outer cylinder 31. The impeller 322 is sleeved on the rotating shaft 321. The axis of the impeller 322, the axis of the rotating shaft 321 and the axis of the outer cylinder 31 are collinear, and the impeller 322 is located inside the powder material passage 31a. The impeller 322 is used to open and close the powder material passage 31a.

[0068] Working principle: When there is no need to convey materials, the rotor 32 is in a static state. The materials in the second conveying tank 20 are blocked by the impeller 322 and cannot fall. The powder material passage 31a is in a closed state. When it is necessary to convey materials, the rotor 32 is driven by a reduction motor 60 to rotate inside the powder material passage 31a. The materials fall into the troughs on the outer periphery of the impeller 322 and are poured into the fluidizer 50 along with the troughs. After the materials are fully mixed with the conveying medium in the bottom fluidizer 50, the precise, stable and continuous conveying of the powder materials under high pressure is realized under the action of the pressure difference. In this way, the conveying frequency of the troughs on the impeller 322 and the second conveying tank 20 can be controlled by adjusting the rotation speed of the rotor 32, so as to realize the precise and stable conveying of the materials.

[0069] In addition, in order to adapt to the continuous transportation of materials under high-pressure conditions, a first conveying tank 10 is provided at the top of the second conveying tank 20. When the materials in the second conveying tank 20 are about to be transported out and need to be replenished, the second feed valve 21 is controlled to close the top opening of the second conveying tank 20, so as to isolate the second conveying tank 20 from the first conveying tank 10, and the gas in the first conveying tank 10 is discharged to make the first conveying tank 10 at normal pressure or low pressure. This can prevent the high-pressure gas in the first conveying tank 10 from entering the material storage bin 120 and blowing the materials in the material storage bin 120, facilitating the entry of materials into the first conveying tank 10. Then, the first feed valve 11 is controlled to open the top opening of the first conveying tank 10, so that the powder materials in the material storage bin 120 fall into the first conveying tank 10. Then, the first feed valve 11 is controlled to close the top opening of the first conveying tank 10, and the first conveying tank 10 is inflated and pressurized to make the air pressure in the first conveying tank 10 balance with the air pressure in the second conveying tank 20. Finally, the second feed valve 21 is controlled to open the top opening of the second conveying tank 20, so that the materials in the first conveying tank 10 fall into the second conveying tank 20, thus completing the replenishment of the materials in the second conveying tank 20, and realizing the continuous transportation of materials under high-pressure conditions.

[0070] Specifically, referring to Figure 1 As shown, the powder material conveying device further includes an exhaust system. The exhaust system includes a first exhaust valve 12 communicated with the first conveying tank 10 and a second exhaust valve 22 communicated with the second conveying tank 20. Both the first exhaust valve 12 and the second exhaust valve 22 are communicated with an exhaust pipeline 100. The first exhaust valve 12 is used for relieving pressure of the first conveying tank 10. When the first exhaust valve 12 is opened, the gas in the first conveying tank 10 is discharged along the exhaust pipeline 100, thereby reducing the pressure in the first conveying tank 10 to facilitate the entry of materials from the material storage bin 120 into the first conveying tank 10. The second exhaust valve 22 is used for relieving pressure of the second conveying tank 20 to facilitate the cleaning and maintenance of the second conveying tank 20 during shutdown.

[0071] Specifically, referring to Figure 1As shown in the figure, the powder material conveying device further includes a pressure stabilizing system. The pressure stabilizing system includes a first pressure balance valve 13 communicated with the first conveying tank 10 and a second pressure balance valve 23 communicated with the second conveying tank 20. Both the first pressure balance valve 13 and the second pressure balance valve 23 are communicated with the air source pipeline 110. The air pressures in the first conveying tank 10 and the second conveying tank 20 are both provided by the air source pipeline 110. When conveying the material in the first conveying tank 10 to the second conveying tank 20, since the first conveying tank 10 is in an atmospheric pressure or low pressure state, if the second feeding valve 21 is directly opened, it will cause pressure imbalance in the second conveying tank 20. Therefore, it is necessary to first open the second pressure balance valve 23 to keep the air pressures in the first conveying tank 10 and the second conveying tank 20 balanced, and then control the second feeding valve 21 to open the top opening of the second conveying tank 20 so that the material in the first conveying tank 10 falls into the second conveying tank 20 to complete the replenishment of the material in the second conveying tank 20.

[0072] Specifically, referring to Figure 1 As shown in the figure, a rubber expansion joint 70 is provided at the top end of the first feeding valve 11, and a rubber expansion joint 70 is provided between the second feeding valve 21 and the first conveying tank 10. Level gauges 80 are installed on both the first conveying tank 10 and the second conveying tank 20. A pressure transmitter 90 is installed on the second conveying tank 20.

[0073] Specifically, referring to Figure 4 As shown in the figure, an installation groove 331 is provided at the outer end of the end cover 33, and a sealing groove 332 is provided at the inner end of the end cover 33. The installation groove 331 is communicated with the sealing groove 332. A bearing 34 is provided in the installation groove 331. Both ends of the rotating shaft 321 pass through the sealing grooves 332 of the two end covers 33 respectively and are connected to the bearing 34 in the installation groove 331. A fluororubber oil seal 35 is provided between the sealing groove 332 and the rotating shaft 321 to seal the outer cylinder 31 through the fluororubber oil seal 35. A dust-proof cover plate 36 is provided outside the installation groove 331. The dust-proof cover plate 36 is used to prevent external dust from entering the bearing 34. One end of the rotating shaft 321 passes through the dust-proof cover plate 36 and is connected with a reduction motor 60. The reduction motor 60 is used to drive the rotating shaft 321 to rotate.

[0074] Since the welding position of the second conveying tank 20 and the flow regulating valve 30 is relatively weak, in order to prevent cracking at the weak part and resulting in material spraying and leakage, which may cause harm to people, etc., in the embodiment of the present application, a protective shell 40 is provided at the bottom of the second conveying tank 20, and an opening is provided at the bottom of the protective shell 40. The middle part of the outer cylinder 31 is located inside the protective shell 40, and the left and right ends of the outer cylinder 31 respectively penetrate through the protective shell 40. In this way, even if the weak part cracks and causes material spraying and leakage, it will leak into the protective shell 40 and will not affect people and the outside world.

[0075] Specifically, the protective shell 40 is conical. A fluidizer 50 is installed at the opening of the protective shell 40. One end of the fluidizer 50 is connected to the gas source pipeline 110, and the other end of the fluidizer 50 is connected to the target storage bin 140.

[0076] In the description of the embodiments of the present application, it should be understood that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. The orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically and precisely defined.

[0077] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A powder and granular material conveying device, characterized in that, It includes a first conveying tank, a second conveying tank and a flow regulating valve; the first conveying tank is arranged at the top of the second conveying tank, and the bottom end of the first conveying tank is communicated with the top end of the second conveying tank; A first feed valve is provided at the opening at the top end of the first conveying tank, and a second feed valve is provided at the communicating part between the first conveying tank and the second conveying tank; The flow regulating valve includes an outer cylinder and a rotor. The outer cylinder is horizontally arranged, and the outer cylinder has a powder channel vertically penetrating the outer cylinder. The top end of the powder channel is communicated with the bottom end of the second conveying tank, and end covers are respectively provided at the left and right ends of the outer cylinder; The rotor is arranged inside the outer cylinder. The rotor includes a rotating shaft and an impeller. The rotating shaft is rotatably connected between the end covers at the left and right ends of the outer cylinder; the impeller is sleeved on the rotating shaft, and the impeller is located inside the powder channel; A protective shell is provided at the bottom of the second conveying tank, and an opening is provided at the bottom of the protective shell; the middle part of the outer cylinder is located inside the protective shell, the left and right ends of the outer cylinder respectively penetrate through the protective shell, and the powder channel is located inside the protective shell; The shape of the protective shell is conical; A fluidizer is installed on the opening of the protective shell. One end of the fluidizer is communicated with an air source pipeline, and the other end of the fluidizer is communicated with a target storage bin.

2. The powder and granular material conveying device according to claim 1, characterized in that The powder and granular material conveying device further includes an exhaust system. The exhaust system includes a first exhaust valve communicated with the first conveying tank and a second exhaust valve communicated with the second conveying tank. Both the first exhaust valve and the second exhaust valve are communicated with an exhaust pipeline.

3. The powder and granular material conveying device according to claim 2, characterized in that, The powder and granular material conveying device further includes a pressure stabilizing system. The pressure stabilizing system includes a first pressure balance valve communicated with the first conveying tank and a second pressure balance valve communicated with the second conveying tank. Both the first pressure balance valve and the second pressure balance valve are communicated with an air source pipeline.

4. The powder and granular material conveying device according to any one of claims 1-3, characterized in that, An installation groove is provided at the outer end of the end cover, and a sealing groove is provided at the inner end of the end cover. The installation groove is communicated with the sealing groove; A bearing is provided in the installation groove. Both ends of the rotating shaft respectively pass through the sealing grooves of the two end covers and are connected with the bearings in the installation groove; a fluororubber oil seal is provided between the sealing groove and the rotating shaft, a dust-proof cover plate is provided at the outer side of the installation groove, and one end of the rotating shaft passes through the dust-proof cover plate and is connected with a reduction motor.

5. The powder and granular material conveying device according to claim 4, characterized in that A rubber expansion joint is provided at the top end of the first feed valve, and a rubber expansion joint is provided between the second feed valve and the first conveying tank.

6. The powder and granular material conveying device according to claim 4, characterized in that, Level gauges are installed on both the first conveying tank and the second conveying tank.

7. The powder and granular material conveying device according to claim 4, characterized in that, A pressure transmitter is installed on the second conveying tank.

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