Pneumatic transport device

Abstract

To provide a transport device for pneumatic transport of granular material which reduces power consumption, eliminates generation of oil mist, does not require a periodic inspection of a tank for storing the granular material, smoothly transfers the granular material from work start, and does not leave any granular material remaining in the tank after work.SOLUTION: The present invention pertains to a pneumatic transport device for transporting a granular material using air, including a rotary claw type blower, a cellar type or a fluxo type tank for storing the granular material, an air supply pipe extending from the blower and communicating with the tank, and a transport pipe that connects the tank to a conveyance destination, in which air supplied by the blower is sent into the tank, and the granular material is sent from the tank to the conveyance destination together with air.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a pneumatic conveying device for powder or granular material. [Background technology]

[0002] Conventionally, compressors have been the mainstream for delivering powders and granules such as wheat flour, rice flour, seasonings, and spices to silos and mixers, but the method using a compressor has problems such as high power consumption, generation of oil mist, deterioration of the powder and granules due to heat, etc. Furthermore, the tanks that store the powder and granules must be strong enough to withstand the use of a compressor, and when the internal pressure of the tank exceeds 200 kPa and the capacity exceeds 40 L, it is necessary to carry out regular inspections as a pressure vessel.

[0003] Patent Document 1 proposes a method and device for transporting powder in a pipe with air from a blower and controlling the temperature of the powder by exchanging heat between the powder and air. This device transports wheat flour stored in a tank while adjusting the temperature, solving the above-mentioned problems associated with the use of compressors and making it possible to maintain the quality of the wheat flour. However, the invention described in Patent Document 1 involves using a blower to pneumatically transport powder and granular materials transferred from a tank to a pipe by a feeder, and because the blower supplies air to the pipe, only air is sent initially when work begins, which has the drawback of delaying the delivery of the powder and granular materials. In addition, there is a problem with stable powder and granular material transportation, in that powder and granular materials inevitably remain in the tank, feeder, and pipe after work is completed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-331280 A Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above circumstances, the present invention has an object to provide a pneumatic transport device for the pneumatic transport of powder or granular material, which reduces power consumption and eliminates the generation of oil mist, does not require regular inspection of the tank for storing the transported powder or granular material, smoothly transfers the powder or granular material from the start of operation, and does not leave any powder or granular material in the tank after operation.

[0006] As a result of extensive research into these issues, the inventors have discovered that by using a blower that can produce a constant amount of air, it is possible to obtain the same transport capacity as when a conventional compressor is used, and because continuous operation is possible, it is actually possible to obtain transport capacity that exceeds that of conventional blowers; power consumption and heat generation are reduced; no oil mist is generated, and the tank does not need to be a pressure vessel, so regular inspections are also not necessary; and further, by blowing air into the tank that stores the powder and granular material, the powder and granular material can be sent out from the tank into the transport pipe, so that the powder and granular material can be sent out steadily from the beginning of the blowing and the amount of powder remaining in the tank after work is greatly reduced. [Means for solving the problem]

[0007] The invention according to claim 1 is A pneumatic conveying device that conveys powder or granular material using air, the pneumatic conveying device comprising: A rotary claw type blower, A cellar-type tank for storing the powder and granular material to be pneumatically transported; an air supply pipe extending from the blower and communicating with the tank; A transport pipe is provided which is connected to a destination from a lower end of the tank, The present invention relates to an air transport device configured to supply air into the tank from the upper part and the middle part of the side surface of the tank via the air supply pipe using the blower, and to transport powdered or granular material toward the destination via the transport pipe connection part of the tank.

[0008] The invention according to claim 2 is as follows: A pneumatic conveying device that conveys powder or granular material using air, the pneumatic conveying device comprising: A rotary claw type blower, A flux tank for storing the powder to be pneumatically transported; A filter disposed horizontally within the tank; an air supply pipe extending from the blower and communicating with the tank; A transport pipe is provided which communicates with and connects the tank to a destination, The blower is configured to supply air into the tank from the bottom end of the tank and the upper side surface of the tank via the air supply pipe, The powder is stored in the tank above the filter, The filter is configured to allow only air to pass through and not allow powder or granular material to pass through, The transport pipe extends from an upper side surface of the tank above the filter and transports powder or granular material.

[0009] The invention according to claim 3 is as follows: The air transportation device according to claim 1 or 2, further comprising a heat removal device provided in the air supply pipe, which removes heat generated by pressure from the air sent out by the blower and returns the air to room temperature.

[0010] The invention according to claim 4 is 3. The pneumatic transportation device according to claim 1 or 2, wherein the blower has a maximum output of 200 kPa. Effect of the Invention

[0011] According to the invention of claim 1, it is possible to pneumatically transport powder and granular material from a cellar-type tank to a destination via a transport pipe by using air supplied from a rotary claw-type blower via an air supply pipe.

[0012] According to the invention of claim 2, it is possible to pneumatically transport powder and granular material from a fluxo-type tank to a destination through a transport pipe by air supplied from a rotary claw-type blower through an air supply pipe.

[0013] According to the invention as defined in claim 3, the heat removal device removes heat from the air sent out by the blower and returns the air to room temperature, thereby providing the effect of not impairing the quality of the powder or granular material being transported.

[0014] According to the invention of claim 4, the maximum output of the blower is 200 kPa, and by setting this output to less than 200 kPa, the tank is no longer certified as a pressure vessel, and regular inspection of the tank becomes unnecessary. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a pneumatic transportation device according to one embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of a pneumatic transportation device according to one embodiment of the present invention. [Diagram 3] 1 is a schematic diagram of a pneumatic transportation device according to one embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a pneumatic transportation device according to one embodiment of the present invention. [Diagram 5] FIG. 2 is a conceptual diagram of a rotary claw of a blower used in the pneumatic transportation device according to the present invention. [Figure 6] FIG. 2 is a cross-sectional view of a filter provided in a fluxo-type tank in the pneumatic transportation device according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of a pneumatic transportation device according to the present invention will be described with reference to the drawings.

[0017] FIG. 1 is a schematic diagram of a pneumatic transportation device according to the present invention using a cellar-type tank. Air is supplied from a blower (1) through an air supply pipe (2) to a tank (3), and the powder or granular material is pneumatically transported from the tank (3) through a transport pipe (4) to a destination (5).

[0018] FIG. 2 is a schematic diagram of a pneumatic transport device according to the present invention using a fluxo-type tank. Air is supplied from a blower (1) through an air supply pipe (2) to a tank (3), and the powder or granular material is pneumatically transported from the tank (3) through a transport pipe (4) to a destination (5). A filter (6) is installed horizontally inside the tank (3) so that the powder or granular material does not fall below the filter (6).

[0019] FIG. 3 is a schematic diagram of a pneumatic transportation device according to one embodiment of the present invention, in which a cellar-type tank is used. The air sent to the air supply pipe (2) by the blower (1) has heat generated by pressure removed by the heat removal device (7), and is returned to room temperature before being supplied to the tank (3). The powder or granular material is pneumatically transported from the tank (3) through the transport pipe (4) to the destination (5).

[0020] FIG. 4 is a schematic diagram of a pneumatic transportation device according to one embodiment of the present invention, in which a fluxo-type tank is used. The air sent to the air supply pipe (2) by the blower (1) has heat generated by pressure removed by the heat removal device (7), and is returned to room temperature before being supplied to the tank (3). The powder or granular material is pneumatically transported from the tank (3) through the transport pipe (4) to the destination (5).

[0021] Fig. 5 is a conceptual diagram of the rotary claw of the blower (1) used in the pneumatic transport device according to the present invention. Two rotary pistons (X1, X2) with claws (A, B) of different shapes rotate synchronously inside the housing to compress and send out air.

[0022] 6 is a cross-sectional image of the filter (6) installed in the tank (3) when a fluxo-type tank is used in the pneumatic conveying device according to the present invention. By overlapping different wire meshes in layers (a, b, c, d, e), it has a structure that does not allow powder or granular material to pass through.

[0023] [Embodiment 1] Hereinafter, a pneumatic transportation device according to the present invention will be described taking the embodiment shown in FIG. 3 as an example. Figure 3 shows an apparatus in which air supplied from a blower (1) is removed from heat by a heat removal device (7) before being supplied to a cellar-type tank (3), and the powder and granular material in the tank is pneumatically transported to a destination (5).

[0024] As shown in the conceptual diagram of Figure 5, the blower (1) is a device that blows out air using two rotary claws. The blower (1) used here has a maximum output of 200 kPa.

[0025] The air intake pipe (2) is preferably made of a material such as SUS304 or SUS316L, and has an inner diameter of 35.7 mm to 108.3 mm and a thickness of 1.2 mm to 3 mm.

[0026] The tank (3) is preferably made of a material such as SUS304 or SUS316L, has a volume of 0.1 to 1.5 cubic meters, and is 3 mm or more thick. It is preferable that the tank has a pressure resistance of 200 kPa or more and a heat resistance of -20°C to 150°C.

[0027] The tank (3) is configured so that powdered material can be added from the top. The air supply pipe (2) is configured to supply air into the tank (3) from the upper and middle sides of the tank (3) and to transport the powder and granular material to the destination (5) via the transport pipe connection part of the tank (3).

[0028] The transport pipe (4) is preferably made of a material such as SUS304 or SUS316L and has an inner diameter of 35.7 mm to 108.3 mm and a thickness of 1.2 mm to 3 mm.

[0029] The transport pipe (4) is connected in communication with the lower end of the tank (3) and pneumatically transports the powder and granular material pushed out of the tank (3) together with air supplied into the tank (3) by the blower (1) to a destination (5). In this embodiment, rice flour was stored as powder in a cellar-type 100 L tank (3), and in a test machine using an air intake pipe (3) and a transport pipe (4) with an inner diameter of 47.8 mm, the transport capacity was 2.5 to 3.3 t / h and the transport distance was 77 m for the test machine.

[0030] [Embodiment 2] Hereinafter, a pneumatic transportation device according to the present invention will be described taking the embodiment shown in FIG. 4 as an example. FIG. 4 shows an apparatus in which air supplied from a blower (1) is removed by a heat removal device (7) before being supplied to a flux tank (3) and the powder and granular material in the tank is pneumatically transported to the destination (5).

[0031] As shown in the conceptual diagram of Figure 5, the blower (1) is a device that blows out air using two rotary claws. The blower (1) used here has a maximum output of 200 kPa.

[0032] The air intake pipe (2) is preferably made of a material such as SUS304 or SUS316L, and has an inner diameter of 35.7 mm to 108.3 mm and a thickness of 1.2 mm to 3 mm.

[0033] The tank (3) is preferably made of a material such as SUS304 or SUS316L, has a volume of 0.1 to 1.5 cubic meters, and is 3 mm or more thick. It is preferable that the tank has a pressure resistance of 200 kPa or more and a heat resistance of -20°C to 150°C.

[0034] The tank (3) is constructed so that powdered materials can be added from the top, and a filter (6) is installed horizontally above the air inlet at the bottom of the tank (3). The filter prevents the powdered materials from falling to the bottom of the tank (3). The air supply pipe (2) is configured to supply air into the tank (3) from the upper side and the bottom end of the tank (3).

[0035] In this embodiment, five layers (a, b, c, d, e) of different wire meshes are used as the filter (6). Although the filter is not limited to this, it is necessary for the filter to have the performance of blocking powder and granular materials while allowing air to pass through.

[0036] The transport pipe (4) is preferably made of a material such as SUS304 or SUS316L and has an inner diameter of 35.7 mm to 108.3 mm and a thickness of 1.2 mm to 3 mm.

[0037] The transport pipe (4) is connected to the inside of the tank at a position above the filter (6) and pneumatically transports the powder and granular material pushed out of the tank (3) together with air supplied into the tank (3) by the blower (1) to the destination (5). In this embodiment, rice flour was stored as powder in a 100 L fluxo-type tank (3), and in a test machine using an air intake pipe (3) and a transport pipe (4) with an inner diameter of 47.8 mm, the transport capacity was 2.5 tons / h to 5.7 tons / h, and the transport distance was 77 m for the test machine.

[0038] The heat removal device (7) is not limited to an air-cooled type, a water-cooled type, or the like, but a type capable of returning the temperature from 50° C. to 100° C. to room temperature (40° C. or less) is preferably used.

[0039] The above describes embodiments using examples of cellar-type and fluxo-type tanks, but the powder and granular material storage container should not be limited to these. It will be obvious to those skilled in the art that the pneumatic transport device of the present invention can be applied to various aspects depending on the method of connection and communication between the air intake pipe and the storage container.

[0040] According to the present invention, there is provided a pneumatic transport device for powder and granular material that can be used in a variety of locations, including powder and granular material related to foods such as wheat flour, rice flour, seasonings, and spices, as well as powder and granular material in various manufacturing industries, such as pharmaceuticals, construction materials, and resin materials.

[0041] According to the present invention, pneumatic transport using a blower can be introduced at sites where powder and granular materials have traditionally been transported pneumatically using a compressor. As a result, power consumption is reduced, the amount of heat generated by the air supplied is also reduced, oil mist is no longer generated, and there is no need for the tank to be a pressurized vessel, making regular inspections unnecessary. In addition, since the powder can be steadily discharged from start to finish together with the air being pumped into the tank, the amount of powder remaining in the tank after work can be significantly reduced. [Industrial Applicability]

[0042] The pneumatic conveying device for powdered or granular material according to the present invention conveys powdered or granular material together with air supplied by a blower, so compared to devices using conventional compressors, it consumes less power and generates less heat from the air, does not produce oil mist, does not require regular inspection of the tank, and allows continuous operation. Furthermore, the powdered or granular material can be smoothly delivered from the beginning together with the air sent into the tank, and the powdered or granular material can be discharged all the way to the end, so that loss due to remaining powder is reduced and cleaning work after operation is also reduced. This is a pneumatic conveying device that realizes multifaceted energy savings in the transportation of powdered or granular material. [Explanation of symbols]

[0043] 1 Blower 2 Air supply pipe 3. Tank 4 Transport pipe 5. Destination 6 Filters 7 Heat removal device A Claw B Claw X1 Rotary Piston X2 Rotary Piston a, b, c, d, e filter layers

Claims

1. A pneumatic conveying device that conveys powder or granular material using air, the pneumatic conveying device comprising: A rotary claw type blower, A cellar-type tank for storing the powder and granular material to be pneumatically transported; an air supply pipe extending from the blower and communicating with the tank; A transport pipe that communicates with a destination from the lower end of the tank; Equipped with An air transport device configured to supply air into the tank from the upper part of the tank side and the middle part of the tank side via the air supply pipe using the blower, and to transport powdered or granular material toward the destination via the transport pipe connection part of the tank.

2. A pneumatic conveying device that conveys powder or granular material using air, the pneumatic conveying device comprising: A rotary claw type blower, A flux tank for storing the powder to be pneumatically transported; A filter disposed horizontally within the tank; an air supply pipe extending from the blower and communicating with the tank; A transport pipe communicating with the tank and connecting it to a destination; Equipped with The blower is configured to supply air into the tank from the bottom end of the tank and the upper side surface of the tank via the air supply pipe, The powder is stored in the tank above the filter, The filter is configured to allow only air to pass through and not allow powder or granular material to pass through, The transport pipe extends from a side surface of the tank above the filter and transports powder or granular material.

3. 3. The air transportation device according to claim 1, further comprising a heat removal device in the air supply pipe for removing heat generated by pressure from the air delivered by the blower and returning the air to room temperature.

4. 3. The pneumatic transportation device according to claim 1, wherein the blower has a maximum output of 200 kPa.

Images