Supply device

Abstract

To provide a supply device capable of realizing a pneumatic transportation system capable of efficiently force-feeding an article to be conveyed with smaller force.SOLUTION: A supply device includes: a transportation part connected to a transportation passage; and a supply part that supplies an article to be conveyed to the transportation part. The transportation part includes: a supply passage through which the article to be transported is supplied from the supply part; and an upstream side passage 32A that is disposed an upstream side of the supply passage, is connected to the transportation passage of the upstream side, and has a flow path for transportation gas formed therein. The upstream side passage 32A has a reduced diameter part where a flow path cross-sectional area gradually decreases from the upstream side to the downstream side. The upstream side passage 32A includes: an outer pipe 40A connected to the supply passage; and an inner pipe 50A disposed within the outer pipe 40A. The reduced diameter part is provided in the inner pipe 50A. The downstream side end part of a central axis P2 of the inner pipe 50A is located lower than the downstream side end part of a central axis P1 of the outer pipe 40A.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a feeding device. [Background technology]

[0002] Conventionally, when transporting an object to a predetermined location such as a storage tank, a pneumatic transport system is used in which the object is mixed with a transport gas that is pumped into a transport passage and transported. The pneumatic transport system includes a transport passage, a gas flow generating device that generates a gas flow in the transport passage, and a supply device that supplies the object to the transport passage.

[0003] Patent Document 1 discloses a supply device used in a pneumatic transport system. The supply device of Patent Document 1 includes a casing and a rotor that is disposed within the casing and has a plurality of compartments defined in the rotational direction by a plurality of vanes. The objects to be transported are supplied from a hopper to each compartment of the rotor of the supply device. The supply device sequentially supplies the contained objects to be transported into the transport passage as the rotor rotates. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-114383 A Summary of the Invention [Problem to be solved by the invention]

[0005] It is preferable that the pneumatic transport system can transport the transported object in a short time. Increasing the flow rate of the transport gas flowing through the transport passage is considered as a method for improving the time efficiency of the transport in the pneumatic transport system. However, in this case, a gas flow generating device with a high output is used, which causes problems of increased energy consumption and the need for a large installation space. [Means for solving the problem]

[0006] A supply device that solves the above problem is a supply device that supplies transported objects into a transport passage through which a transport gas is pressurized, and includes a transport section connected to the transport passage and a supply section that supplies the transported objects to the transport section, the transport section including a supply passage arranged below the supply section or at a position overlapping the lower part of the supply section and through which the transported objects are supplied from the supply section, and an upstream passage arranged upstream of the supply passage and connected to the upstream transport passage and within which a flow path for the transport gas is formed, the upstream passage including a reduced diameter portion whose flow path cross-sectional area gradually reduces from the upstream side to the downstream side, the upstream passage including an outer tube connected to the supply passage, and an inner tube arranged within the outer tube and having the reduced diameter portion, and the downstream end of the central axis of the inner tube is located below the downstream end of the central axis of the outer tube.

[0007] According to the above configuration, the upstream passage, which is a portion through which the transport gas flows from the upstream transport passage to the supply passage, is provided with a reduced diameter portion in which the cross-sectional area of ​​the flow passage gradually decreases from the upstream side to the downstream side. In this case, the transport gas is compressed when passing through the reduced diameter portion of the upstream passage, and the compressed transport gas flows into the supply passage. This strengthens the force of the transport gas pushing the transported object supplied to the supply passage to the downstream transport passage. In addition, the flow rate of the transport gas is increased when passing through the reduced diameter portion of the upstream passage. Then, the transport gas with the increased flow rate passes through the supply passage, generating a suction force due to a negative pressure effect in the supply passage. The suction force sucks the transported object in the supply section into the supply passage. As a result, the transported object in the supply section can be efficiently moved to the supply passage, and the transported object moved into the supply passage can be efficiently discharged to the downstream transport passage.

[0008] In particular, in a pneumatic transport system that uses a transport gas to pump the transported objects, the transport gas consumes a large amount of energy when moving the transported objects that are stationary in the supply device. Therefore, by using the supply device having the above configuration that can efficiently discharge the transported objects in the supply device to the transport passage, a pneumatic transport system that can efficiently pump the transported objects with less force can be realized.

[0009] By adopting a configuration of an upstream passage consisting of an outer pipe and an inner pipe with a reduced diameter portion, a supply device having the above configuration can be realized by attaching the inner pipe to an existing supply device in which the upstream passage does not have a reduced diameter portion. In addition, by configuring the central axis of the outer pipe and the central axis of the inner pipe to have the above relationship, the position in the supply passage where suction force is generated due to the negative pressure effect caused by the passage of the transport gas can be shifted to the lower side of the supply passage. This makes it possible to suck the transported object into the supply passage and to suppress the transported object from being blown up in the supply passage. As a result, the transported object in the supply section can be moved to the supply passage more efficiently.

[0010] In the above supply device, it is preferable that the central axis of the inner pipe is inclined downward with respect to the central axis of the outer pipe so that the downstream side is located lower. With the above configuration, the effect of suppressing the blowing up of the transported material in the supply passage can be more significantly obtained.

[0011] In the above supply device, the upstream passage preferably includes a helical wall for causing the transport gas flowing through the reduced diameter portion to swirl in a helical shape. According to the above configuration, the swirling of the transport gas improves the compression efficiency of the transport gas in the reduced diameter section and improves the straightness of the transport gas. This further strengthens the force of the transport gas that is strengthened by providing the reduced diameter section. In addition, the swirling of the transport gas provides a straightening effect that suppresses turbulence of the transport gas when it flows through the supply passage. This straightening effect reduces energy loss due to turbulence of the transport gas when it flows through the supply passage. As a result, the transported objects in the supply passage can be discharged more efficiently to the downstream transport passage.

[0012] In the above supply device, the spiral wall is preferably provided in the reduced diameter portion. According to the above-mentioned configuration, the compression efficiency of the transport gas in the reduced diameter portion is improved, and the upstream passage can be made shorter than in the case where the spiral wall is provided upstream of the reduced diameter portion. Effect of the Invention

[0013] According to the supply device of the present invention, a pneumatic transport system can be realized that can efficiently pump transported objects with less force. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view of the supply device according to the first embodiment. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 of FIG. 2. [Figure 4] FIG. 2 is a perspective view of an inner tube according to the first embodiment. [Diagram 5] FIG. 11 is a cross-sectional view of an upstream passage of the second embodiment. [Figure 6] FIG. 11 is a cross-sectional view of an upstream passage of a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] First Embodiment The supply device of the first embodiment will be described below. The supply device 10 of this embodiment is used to supply the transported object into the transport passage in a pneumatic transport system in which the transported object is mixed with a transport gas such as air pressure-fed into the transport passage and transported. The transported object is not particularly limited and includes all objects that are the subject of transport in known pneumatic transport systems. Examples of the transported object include powders such as cement and wood powder, and granular materials such as metal chips, glass chips, and plastic chips.

[0016] As shown in Figures 1 to 3, the supply device 10 includes a transport section 30 connected to a transport passage (not shown), a casing 11 as a supply section that sequentially supplies transported objects to the transport section 30, an opening / closing mechanism 16, and a rotating body 20.

[0017] (Casing and opening / closing mechanism) 1 to 3, the casing 11 includes a horizontally cylindrical peripheral wall 12, a disk-shaped upstream end wall 13 and a downstream end wall 14 closing both ends of the peripheral wall 12, and an intake tube portion 15 provided on the upper portion of the peripheral wall 12. The intake tube portion 15 is a wall portion having a vertical cylindrical shape. The upper portion of the intake tube portion 15 is an intake port 15a for taking in the transported object, and the internal space of the intake tube portion 15 communicates with the internal space of the peripheral wall 12.

[0018] An opening / closing mechanism 16 for closing the intake 15a is attached to the upper part of the intake tube 15 of the casing 11. The opening / closing mechanism 16 is configured to be switchable between a closed state in which the intake 15a is closed and an open state in which the intake 15a is open. The configuration of the opening / closing mechanism 16 is not particularly limited as long as it can be arbitrarily switched between the above-mentioned closed state and open state. In the drawings, as an example, a flap-type opening / closing mechanism 16 operated by a driving unit M1 such as a motor is illustrated. In addition, a bypass pipe 17 is provided on the outside of the casing 11 to communicate the internal space of the peripheral wall 12 and the internal space of the intake tube 15 from the outside.

[0019] (rotating body) 2 and 3, a rotor 20 for transporting an object is attached inside the peripheral wall 12 of the casing 11. The rotor 20 has a rotating shaft 21 rotatably supported by the upstream end wall 13 and the downstream end wall 14 of the casing 11 via bearings (not shown). One end of the rotating shaft 21 passes through the downstream end wall 14 and is positioned outside the casing 11, and is drivingly connected to a drive unit M2 such as a motor. The rotating shaft 21 rotates based on the rotational power from the drive unit M2.

[0020] A pair of disk-shaped mounting plates 22 are fixed to the rotating shaft 21. A horizontally cylindrical rotor 23 is fixed to the outer periphery of the mounting plates 22. Then, vane plates 24 extending radially outward from the rotor 23 are fixed to the outer periphery of the rotor 23. A plurality of vane plates 24 are attached at equal intervals in the circumferential direction of the rotor 23. A partition chamber R that opens radially outward is defined on the outer periphery of the rotor 23 by the vane plates 24 adjacent to each other along the circumferential direction. A plurality of partition chambers R are formed so as to be aligned in the circumferential direction of the rotor 23.

[0021] As shown in FIG. 3, the rotor 20 rotates along a certain movement path so that each partition R passes through a supply position A1, a discharge position A2, and an exhaust position A3 in the casing 11 in sequence with the rotation of the rotating shaft 21. The supply position A1 is a position for supplying the transported object to the partition R. In this embodiment, the supply position A1 is set to a position where the opening of the partition R faces upward and faces the internal space of the intake tube 15, that is, the position when the partition R moves to the uppermost position. The discharge position A2 is a position for discharging the transported object contained in the partition R, and is a position when the partition R moves to a supply passage 31 described later. In this embodiment, the discharge position A2 is set to a position where the opening of the partition R faces downward, that is, the position when the partition R moves to the lowermost position.

[0022] The exhaust position A3 is a position for discharging the air in the partition chamber R after the transported objects have been discharged to the bypass pipe 17. The exhaust position A3 is a position where the opening of the partition chamber R faces the portion of the casing 11 to which the end of the bypass pipe 17 is connected. By discharging the air in the partition chamber R after the transported objects have been discharged to the bypass pipe 17, air is prevented from being blown up from the partition chamber R toward the intake tube portion 15 when the partition chamber R moves to the supply position A1.

[0023] (Transportation Department) As shown in FIG. 2, the transport section 30 includes a supply passage 31 , an upstream passage 32 , and a downstream passage 33 .

[0024] A supply port 13a is formed at the lower center of the upstream end wall 13 of the casing 11, penetrating the upstream end wall 13. A discharge port 14a is formed at the lower center of the downstream end wall 14 of the casing 11, penetrating the downstream end wall 14. The supply port 13a and the discharge port 14a are formed at positions facing each other at the lower center of each of the upstream end wall 13 and the downstream end wall 14. The supply port 13a and the discharge port 14a are formed in a shape that is one size larger than the cross-sectional shape perpendicular to the axis of the rotation shaft 21 of the rotor 20 in the partition chamber R. In this embodiment, the range located between the supply port 13a and the discharge port 14a in the casing 11 becomes a supply passage 31 through which the transported object is supplied from the supply section. The supply passage 31 is a passage that extends linearly in the axial direction of the rotor 20. In other words, the supply passage 31 is arranged at a position that overlaps with the lower part of the rotor 20 (the lower part of the supply section). Although not shown in the drawings, the supply passage 31 may be disposed below the rotor 20 (below the supply portion).

[0025] A tubular upstream passage 32 is attached to the outer surface of the upstream end wall 13, connecting an upstream transport passage (not shown) and the casing 11. The inside of the upstream passage 32 communicates with the supply passage 31 through the supply port 13a. A tubular downstream passage 33 is attached to the outer surface of the downstream end wall 14, connecting a downstream transport passage (not shown) and the casing 11. The inside of the downstream passage 33 communicates with the supply passage 31 through the discharge port 14a.

[0026] The upstream passage 32 has a double-cylinder structure including an outer pipe 40 and an inner pipe 50 disposed inside the outer pipe 40. The outer pipe 40 has a cylindrical outer pipe peripheral wall 41. The upstream end opening of the outer pipe peripheral wall 41 has a shape that matches the inner circumferential shape of the transport passage, and the downstream end opening of the outer pipe peripheral wall 41 has a shape that matches the supply port 13a. The outer pipe peripheral wall 41 is formed in a shape in which the inner circumferential shape gradually approaches the shape of the downstream end opening from the upstream side to the downstream side. The upstream end of the outer pipe peripheral wall 41 is provided with a flange 42 that is fixed to the transport passage with a screw. The downstream end of the outer pipe peripheral wall 41 is provided with a flange 43 that is fixed to the casing 11 with a screw.

[0027] 2 and 4, the inner pipe 50 has a cylindrical inner pipe circumferential wall 51 whose inner circumferential surface gradually decreases in diameter from the upstream side to the downstream side. The upstream end opening of the inner pipe circumferential wall 51 is smaller than the inner circumferential shape of the transport passage by the thickness of the inner pipe circumferential wall 51. The downstream end opening of the inner pipe circumferential wall 51 is smaller than the supply port 13a. In this embodiment, the inner pipe circumferential wall 51 corresponds to a reduced diameter portion where the flow path cross-sectional area gradually decreases from the upstream side to the downstream side.

[0028] The diameter reduction ratio of the reduced diameter portion is, for example, preferably such that the cross-sectional area of ​​the downstream end of the reduced diameter portion is 95% or less, and more preferably such that the cross-sectional area of ​​the upstream end of the reduced diameter portion is 70% or less. The diameter reduction ratio of the reduced diameter portion is, for example, preferably such that the cross-sectional area of ​​the downstream end of the reduced diameter portion is 10% or more, and more preferably such that the cross-sectional area of ​​the upstream end of the reduced diameter portion is 60% or more. The cross-sectional area of ​​the downstream end of the reduced diameter portion is preferably equal to or less than the cross-sectional area of ​​the supply port 13a.

[0029] The inner pipe 50 has a helical wall 52 for spirally swirling the transport gas flowing inside the inner pipe circumferential wall 51, which is the reduced diameter portion. The helical wall 52 extends radially from the central axis P of the inner pipe circumferential wall 51 to the inner pipe circumferential wall 51, and is formed in a shape such that the position of the connection portion with the inner pipe circumferential wall 51 gradually changes in the circumferential direction from the upstream side to the downstream side. The inside of the inner pipe 50 is divided in the circumferential direction by the helical wall 52, and a plurality of independent helical flow paths 53 are formed, each extending helically around the central axis P.

[0030] In the drawings, the spiral wall 52 forming six spiral flow paths 53 is shown as an example. The upstream end of the inner pipe peripheral wall 51 is provided with a flange 54 which is fixed to the flange 42 of the outer pipe 40 and the transport passage with screws. The inner pipe 50 is inserted into the outer pipe 40 from the upstream end opening of the outer pipe 40, and then the flange 54 of the inner pipe 50 is placed over the flange 42 of the inner pipe 50 and fixed to the transport passage together with the flange 42 with screws. This brings the outer pipe 40 and the inner pipe 50 into a fixed state for use. As shown in Fig. 2, in the above-mentioned state of use, the downstream end of the inner pipe peripheral wall 51 of the inner pipe 50 is contained within the outer pipe 40 without protruding from the outer pipe 40.

[0031] Next, the operation of the first embodiment will be described. When the supply device 10 is used to supply the transported object into the transport passageway, first, the opening / closing mechanism 16 is opened, and the transported object is input from the inlet 15a into the intake tube 15 of the casing 11. The transported object is then accommodated in the intake tube 15. Next, the opening / closing mechanism 16 is switched from the open state to the closed state to seal the inside of the casing 11.

[0032] Thereafter, by rotating the rotor 20, the partition R repeatedly moves from the supply position A1 to the discharge position A2 and from the discharge position A2 to the supply position A1. The supply position A1 is located at the top of the rotor 20 (top of the supply section), and the discharge position A2 is located at the bottom of the rotor 20 (bottom of the supply section). When the partition R reaches the supply position A1, it is filled with the transported material contained in the intake tube 15. Then, the partition R filled with the transported material reaches the discharge position A2, which is the supply passage 31.

[0033] At this time, the transported objects filled in the partition R are mixed with the transport gas supplied from the upstream transport passage to the supply passage 31 through the upstream passage 32, and are pumped to the downstream transport passage through the downstream passage 33. In this manner, as the rotor 20 rotates, the partition R is repeatedly filled with the transported objects at the supply position A1, and the transported objects in the partition R are repeatedly pumped to the discharge position A2. As a result, the transported objects contained in the intake tube 15 are sequentially supplied to the transport passage.

[0034] In this embodiment, the upstream passage 32 is provided with a reduced diameter portion in which the flow passage cross-sectional area gradually decreases from the upstream side to the downstream side. In this case, the transport gas is compressed when passing through the reduced diameter portion of the upstream passage 32, and the compressed transport gas flows into the supply passage 31. This increases the force of the transport gas pushing out the transported objects filled in the partition chamber R, so that the transported objects can be efficiently discharged to the downstream transport passage.

[0035] In addition, the flow velocity of the transport gas is increased when it passes through the reduced diameter portion of the upstream passage 32. Then, as the transport gas with increased flow velocity passes through the supply passage 31, a suction force is generated in the supply passage 31 due to a negative pressure effect. This suction force sucks the transported objects filled in the partition chamber R of the rotor 20 into the supply passage 31. As a result, the transported objects in the partition chamber R can be efficiently moved to the supply passage 31, and the transported objects moved into the supply passage 31 can be efficiently discharged to the downstream transport passage.

[0036] In addition, in this embodiment, the spiral wall 52 is provided in the upstream passage 32, so that the transport gas flowing through the reduced diameter portion is turned into a swirling flow that swirls in a spiral shape. The swirling of the transport gas improves the compression efficiency of the transport gas in the reduced diameter portion and improves the straightness of the transport gas. This further strengthens the force of the transport gas that is strengthened by providing the reduced diameter portion. In addition, the swirling of the transport gas efficiently mixes the transported objects filled in the partition chamber R with the transport gas. As a result, the transported objects filled in the partition chamber R can be more efficiently discharged to the downstream transport passage. In addition, the swirling of the transport gas provides a rectifying effect that suppresses turbulence of the transport gas when it flows through the supply passage 31. This rectifying effect reduces energy loss due to turbulence of the transport gas when it flows through the supply passage 31.

[0037] Next, the effects of the first embodiment will be described. (1-1) The supply device 10 comprises a transport section 30 connected to a feed passage, and a supply section that supplies transported objects to the transport section 30. The transport section 30 comprises a supply passage 31 to which the transported objects are supplied from the supply section, and an upstream passage 32 that is disposed upstream of the supply passage 31, is connected to the upstream transport passage, and has a flow path for the transport gas formed therein. The upstream passage 32 comprises a reduced diameter portion whose flow path cross-sectional area gradually reduces from the upstream side to the downstream side.

[0038] In a pneumatic transport system that uses a transport gas to pump transported objects, the transport gas consumes a large amount of energy when moving the transported objects that are stationary in the supply device 10. Therefore, by using the supply device 10 having the above configuration that can efficiently discharge the transported objects into the transport passage, a pneumatic transport system that can efficiently pump the transported objects with less force can be realized. In addition, it becomes possible to adopt a gas flow generator with a smaller output that generates a gas flow in the transport passage.

[0039] (1-2) The upstream passage 32 includes a spiral wall 52 for causing the transport gas flowing through the reduced diameter portion to swirl in a spiral shape. According to the above configuration, the effect of (1-1) can be obtained more significantly.

[0040] (1-3) The spiral wall 52 is provided in the reduced diameter portion. According to the above-mentioned configuration, the compression efficiency of the transport gas in the reduced diameter portion is improved. As a result, the effect of (1) above can be obtained more significantly. In addition, the upstream passage 32 can be made shorter than when the spiral wall 52 is provided upstream of the reduced diameter portion.

[0041] (1-4) The upstream passage 32 includes an outer pipe 40 and an inner pipe 50 disposed within the outer pipe 40. The inner pipe 50 is provided with a reduced diameter portion. According to the above configuration, the supply device 10 of the present embodiment can be realized by attaching the inner pipe 50 to an existing supply device in which the upstream passage 32 does not have a reduced diameter portion. Furthermore, when the inner pipe 50 is detachable from the outer pipe 40, replacement and maintenance of the reduced diameter portion can be easily performed.

[0042] <Second embodiment> The supply device 10 of the second embodiment will be described below. The supply device 10 of the second embodiment differs from the first embodiment in the configuration of the upstream passage 32. In the following, the description of the same components as in the first embodiment will be omitted, and only the configuration of the upstream passage 32 that differs from the first embodiment will be described. Hereinafter, the upstream passage of the second embodiment will be referred to as an upstream passage 32A.

[0043] 5, the upstream passage 32A has a double-cylinder structure including an outer pipe 40A and an inner pipe 50A disposed inside the outer pipe 40A. The outer pipe 40A has a cylindrical outer pipe circumferential wall 41A. An upstream end opening of the outer pipe circumferential wall 41A has a shape that matches the inner circumferential shape of the transport passage, and a downstream end opening of the outer pipe circumferential wall 41A has a shape that matches the supply port 13a.

[0044] The outer pipe peripheral wall 41A is formed in such a shape that the inner peripheral shape gradually approaches the shape of the downstream end opening from the upstream side to the downstream side. The upstream end of the outer pipe peripheral wall 41A is provided with a flange 42 that is fixed to the transport passage with a screw. In addition, the downstream end of the outer pipe peripheral wall 41A is provided with a flange 43 that is fixed to the casing 11 with a screw.

[0045] The outer pipe peripheral wall 41A has a central axis P1 that extends linearly from the upstream end opening to the downstream end opening. The downstream end of the central axis P1 coincides with the center of the flow passage cross section at the supply port 13a. The extension direction of the central axis P1 coincides with the flow direction of the transport gas in the supply passage 31. The extension direction of the central axis P1 is, for example, a horizontal direction. The shape of the inner circumferential surface of the outer pipe peripheral wall 41A is, for example, a circular cross section centered on the central axis P1, and is a tapered shape whose cross-sectional area gradually decreases from the upstream side to the downstream side.

[0046] The inner pipe 50A has a cylindrical inner pipe circumferential wall 51A whose inner circumferential surface gradually decreases in diameter from the upstream side to the downstream side. The upstream end opening of the inner pipe circumferential wall 51A is smaller than the inner circumferential shape of the transport passage by the thickness of the inner pipe circumferential wall 51. The downstream end opening of the inner pipe circumferential wall 51A is smaller than the supply port 13a. In this embodiment, the inner pipe circumferential wall 51A corresponds to a reduced diameter portion whose flow passage cross-sectional area gradually decreases from the upstream side to the downstream side. The configuration regarding the reduction ratio of the reduced diameter portion is the same as that of the inner pipe 50 of the first embodiment.

[0047] The inner pipe peripheral wall 51A has a central axis P2 that extends linearly from the upstream end opening to the downstream end opening. In the vertical direction, the upstream end of the central axis P2 coincides with the upstream end of the central axis P1 of the outer pipe peripheral wall 41A. In the vertical direction, the downstream end of the central axis P2 is located lower than the downstream end of the central axis P1 of the outer pipe peripheral wall 41A. Therefore, the central axis P2 is inclined relative to the central axis P1 so that it is located lower toward the downstream side.

[0048] The inclination angle θ of the central axis P2 with respect to the central axis P1 is, for example, equal to or greater than 1 degree and less than 90 degrees. The vertical length passing through the central axis P1 at the downstream end of the outer pipe peripheral wall 41A is defined as length L. Length L is, for example, the diameter of a circle formed by the inner peripheral surface of the outer pipe peripheral wall 41A at the downstream end. In this case, the vertical deviation D between the downstream end of the central axis P1 and the downstream end of the central axis P2 is, for example, 1 / 100 or more and less than 1 / 2 of the length L.

[0049] The inner pipe 50A has a helical wall 52 for spirally swirling the transport gas flowing inside the inner pipe circumferential wall 51A, which is the reduced diameter portion. The helical wall 52 extends radially from the central axis P2 of the inner pipe circumferential wall 51A to the inner pipe circumferential wall 51A, and is formed in a shape such that the position of the connection part with the inner pipe circumferential wall 51A gradually changes in the circumferential direction from the upstream side to the downstream side. The inside of the inner pipe 50A is divided in the circumferential direction by the helical wall 52, and a plurality of independent helical flow paths 53 are formed, each extending helically around the central axis P.

[0050] Next, the effects of the second embodiment will be described. According to the second embodiment, in addition to the effects described in (1-1) to (1-4) above, the following effects can be obtained. (2-1) The upstream passage 32A includes an outer pipe 40A and an inner pipe 50A disposed within the outer pipe 40A. The reduced diameter portion is provided in the inner pipe 50A. The downstream end of the central axis P2 of the inner pipe 50A is located lower than the downstream end of the central axis P1 of the outer pipe 40A. With the above configuration, the transport gas passes through a lower position within the supply passage 31.

[0051] (2-2) The central axis P2 of the inner pipe 50A is inclined relative to the central axis P1 of the outer pipe 40A so as to be positioned lower toward the downstream side. According to the above configuration, the effect of (2-1) can be more significantly obtained.

[0052] The above-described embodiments may be modified as follows: The above-described embodiments and the following modifications may be combined with each other to the extent that no technical contradiction occurs.

[0053] The upstream passages 32, 32A may have a portion with a constant flow passage cross-sectional area upstream of the reduced diameter portion. Also, the upstream passage 32 may have a portion with a constant flow passage cross-sectional area downstream of the reduced diameter portion.

[0054] With respect to the upstream passage 32A, the upstream end of the central axis P2 does not have to coincide with the upstream end of the central axis P1 of the outer pipe peripheral wall 41A in the up-down direction. In this case, the central axis P2 of the inner pipe 50A may be parallel to the central axis P1 of the outer pipe 40A.

[0055] The specific shape of the helical wall 52 is not particularly limited, and may be any shape that can cause the transport gas to swirl in a helical manner. For example, in the above embodiment, the helical wall 52 is shaped to divide the flow path into a plurality of helical flow paths 53, but the helical wall 52 may be shaped not to divide the flow path. For example, in an example shown in FIG. 6, a plurality of helical walls 52 are provided on the inner pipe peripheral wall 51. Each of the plurality of helical walls 52 protrudes from the inner pipe peripheral wall 51A toward the central axis P2, and has a shape in which the position of the connection portion with the inner pipe peripheral wall 51 gradually changes in the circumferential direction. In addition, the plurality of helical walls 52 are formed at equal intervals in the circumferential direction of the inner pipe peripheral wall 51.

[0056] The spiral wall 52 may be provided in a portion upstream of the reduced diameter portion in the upstream passage 32, 32A. Also, the upstream passage 32, 32A may be configured without the spiral wall 52. The upstream passage 32 may be a single-pipe upstream passage 32 instead of the double-pipe upstream passage 32 having the outer pipe 40 and the inner pipe 50. For example, the upstream passage 32 may be composed of only the inner pipe 50.

[0057] The downstream passage 33 may be omitted, and the downstream transport passage may be directly connected to the casing 11. Next, technical ideas that can be understood from the above-described embodiments and modifications will be described below.

[0058] (i) The supply device, wherein a flow passage cross-sectional area of ​​a downstream end of the reduced diameter portion is equal to or smaller than a flow passage cross-sectional area of ​​the supply passage. (b) A supply device comprising a rotor that divides a plurality of partition chambers in the rotational direction using a plurality of blades, the movement trajectory of each of the partition chambers accompanying the rotation of the rotor being made to correspond to a transport passage through which the transport gas is pressurized, and the transported material filled in the partition chambers is supplied into the transport passage based on the rotation of the rotor. [Explanation of symbols]

[0059] P,P1,P2…center axis 10…Feeding device 11…Casing 17...Opening and closing mechanism 20...Rotating body 30…Transportation Department 31…Supply passage 32, 32A…Upstream passage 40,40A…Outer tube 50,50A…Inner pipe 52...Spiral wall 53...Spiral flow path

Claims

1. A supply device for supplying an object to be transported into a transport passage through which a transport gas is pumped, comprising: A transport section connected to the transport passage; a supply unit that supplies the transported object to the transport unit, the transport section includes a supply passage disposed below the supply section or at a position overlapping a lower portion of the supply section, through which the transported object is supplied from the supply section, and an upstream passage disposed upstream of the supply passage, connected to the upstream transport passage, and having a flow path for a transport gas formed therein; the upstream passage includes a reduced diameter portion in which a flow passage cross-sectional area is gradually reduced from the upstream side to the downstream side, the upstream passage includes an outer pipe connected to the supply passage, and an inner pipe disposed within the outer pipe and having the reduced diameter portion, A supply device, characterized in that a downstream end of the central axis of the inner pipe is located lower than a downstream end of the central axis of the outer pipe.

2. 2. The supply device according to claim 1, wherein a central axis of the inner pipe is inclined downwardly with respect to a central axis of the outer pipe toward a downstream side.

3. 3. The supply device according to claim 1, wherein the upstream passage includes a spiral wall for causing the transport gas flowing through the reduced diameter portion to spirally swirl.

4. 4. The delivery device of claim 3, wherein the spiral wall is disposed in the reduced diameter portion.

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