Dry dust collector for grain dryers

Abstract

To obtain a dry dust collector for a grain dryer capable of improving dust collection performance regardless of the air volume of a blower in the grain dryer. [Solution] A dry dust collector 10 for a grain dryer comprising an inlet 26 into which exhaust gas discharged from a grain dryer 17 is introduced, a duct body 22 which separates dust from the exhaust gas introduced from the inlet 26 by a swirling flow, a separation section 20 having a discharge outlet 28 from which dust-removed exhaust gas from which dust has been separated in the duct body 22 is discharged to the outside, and a collection section 30 connected to the discharge outlet 26 side of the duct body 22 and collects the dust separated in the duct body 22, wherein the duct body 22 has a tapered section 24 in a predetermined region on the inlet 26 side, the inner diameter of the duct body 22 widening as it approaches the discharge outlet 28 side, and an impeller 40 is provided inside the tapered section 24 of the duct body 22 which is rotated to generate a swirling flow inside the duct body 22 on the discharge outlet 28 side of the tapered section 24.

Description

[Technical field]

[0001] The present invention relates to a dry dust collector for a grain dryer. [Background technology]

[0002] 2. Description of the Related Art Dry dust collectors for grain dryers that use a fixed swirling flow generator to centrifuge dust discharged from a grain dryer that dries grains such as rice have been known for some time (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 55-068552 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the fixed type swirling flow generator is structured to generate the swirling flow required for centrifugal separation of dust by utilizing the force of the air blown (exhaust) from the blower in the grain dryer, the dust collection performance is not high, and there is a risk that dust that cannot be collected by the dust collector will be discharged outside the dust collector. In addition, from the viewpoint of air volume loss, there is also the problem of having to select a dust collector that matches the air volume of the blower in the grain dryer.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a dry type dust collector for a grain dryer that can improve dust collection performance regardless of the air volume of the blower in the grain dryer. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a first aspect of the dry dust collector for a grain dryer according to the present invention comprises a separation section having an inlet through which exhaust gas discharged from a grain dryer is introduced, a duct body that separates dust from the exhaust gas introduced from the inlet by a swirling flow, and an outlet through which dust-removed exhaust gas from which dust has been separated in the duct body is discharged to the outside, and a collection section connected to the outlet side of the duct body and collecting the dust separated in the duct body, wherein the duct body has a tapered section in a predetermined region on the inlet side, the inner diameter of the duct body widening toward the outlet side, and an impeller is provided inside the tapered section of the duct body that is rotationally driven to generate the swirling flow inside the duct body on the outlet side of the tapered section.

[0007] According to the first aspect of the invention, a tapered section is formed in a predetermined region on the inlet side of the duct body of the separation section, in which the inner diameter of the duct body widens toward the outlet side. An impeller is provided inside the tapered section of the duct body, which is rotationally driven to generate a swirling flow inside the duct body on the outlet side of the tapered section.

[0008] Therefore, the tapered portion and the impeller can smoothly generate a swirling flow inside the duct body that flows in the exhaust direction (toward the outlet), and the dust in the exhaust air introduced from the inlet is effectively separated by the swirling flow. In other words, according to the present invention, the dust collection performance is improved regardless of the air volume of the blower in the grain dryer.

[0009] A second aspect of the dry dust collector for a grain dryer according to the present invention is the dry dust collector for a grain dryer of the first aspect, wherein the impeller includes a pair of ring portions aligned in the direction of the rotation axis and a plurality of blades connecting the pair of ring portions, and the inner diameter of the ring portions is formed to be the same as or larger than the inner diameter of the duct body on the inlet side of the tapered portion.

[0010] According to the second aspect of the invention, the impeller includes a pair of rings arranged in the direction of the rotation axis and a plurality of blades connecting the pair of rings. The inner diameter of the rings is the same as or larger than the inner diameter of the duct body on the inlet side of the tapered portion. Therefore, there is no risk of the rings of the impeller obstructing the exhaust air.

[0011] Furthermore, a third aspect of the dry dust collector for a grain dryer according to the present invention is a dry dust collector for a grain dryer of the first or second aspect, wherein the separation section is supported by a plurality of pillars, and the collection section is supported on at least one of the plurality of pillars via a support member.

[0012] According to the third aspect of the invention, the separating section is supported by a plurality of columns, and the collecting section is supported by at least one of the plurality of columns via a support member. This increases the degree of freedom in setting the dust collection bag attached to the lower end of the collecting section, and makes it possible to attach and detach the dust collection bag using a loading and transporting device. Effect of the Invention

[0013] As described above, according to the present invention, the dust collection performance can be improved regardless of the air volume of the blower in the grain dryer. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic perspective view showing a dry dust collector for a grain dryer according to an embodiment of the present invention. FIG. [Diagram 2] 1 is a schematic side cross-sectional view showing an enlarged view of a main part of a dry dust collector for a grain dryer according to an embodiment of the present invention. FIG. [Diagram 3] FIG. 2 is a schematic perspective view showing an enlarged view of an impeller of the dry dust collector for a grain dryer according to the embodiment of the present invention. [Figure 4] FIG. 2 is a schematic rear view showing the dry dust collector for a grain dryer according to the embodiment. [Diagram 5] FIG. 2 is a schematic cross-sectional side view showing the operation of the dry dust collector for a grain dryer according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. For ease of explanation, a dry dust collector 10 for a grain dryer (hereinafter, sometimes simply referred to as "dust collector 10") according to this embodiment will be referred to as a "front view" when viewed from the downstream side of the exhaust air direction in which the exhaust air flows, and as a "side view" when viewed from a horizontal direction perpendicular to the exhaust air direction.

[0016] Moreover, both side portions when the dust collector 10 is viewed from the front are referred to as left and right side portions. That is, the left and right direction of the dust collector 10 is the left and right direction when the dust collector 10 is viewed from the front. Moreover, hereinafter, the upstream side in the exhaust direction in which the exhaust gas flows (upstream side of the swirling flow) may be simply referred to as the "upstream side", and the downstream side in the exhaust direction in which the exhaust gas flows (downstream side of the swirling flow) may be simply referred to as the "downstream side".

[0017] As shown in Fig. 1, the dust collector 10 includes a separation section 20 and a collection section 30. The separation section 20 has a substantially cylindrical duct body 22 arranged so that the axial direction is horizontal. The duct body 22 is supported by a support frame 12. The support frame 12 has four pillars 14, and the four corners of the duct body 22 are attached to the upper part of each pillar 14. That is, the upstream end and the downstream end on both the left and right sides of the duct body 22 in a front view are attached to the upper part of the pillars 14. In addition, the lower parts of adjacent pillars 14 are connected by a connecting frame 16.

[0018] A circular inlet 26 (see also FIG. 2) having an inner diameter smaller than the outer diameter of the duct body 22 in a front view is coaxially formed at the upstream end of the duct body 22. A circular outlet 28 having an inner diameter smaller than the outer diameter of the duct body 22 in a front view is coaxially formed at the downstream end of the duct body 22. Specifically, a cylindrical portion 23 having a smaller diameter and shorter length than the duct body 22 is coaxially attached to the downstream end of the duct body 22, and the outlet 28 is the downstream end of the cylindrical portion 23 (see also FIG. 5).

[0019] The downstream end of an exhaust gas inlet 18 that introduces exhaust gas discharged from a grain dryer 17 that dries grains such as rice is connected to the inlet 26. The exhaust gas discharged from the exhaust gas inlet 18 and introduced from the inlet 26 flows along a swirling flow inside the duct main body 22 toward the outlet 28, while dust is centrifuged and removed from the exhaust gas. The dust-removed exhaust gas (clean exhaust gas from which dust has been removed) that has been removed by flowing inside the duct main body 22 is discharged from the outlet 28 to the outside (atmosphere).

[0020] In addition, the upper end of a collection section 30 that collects dust that has been collected on the inner surface side of the duct body 22 by centrifugal separation inside the duct body 22 is connected to the upper end of the downstream end of the duct body 22 on one side in the left-right direction (the right side in the illustrated example) by a duct hose 34.

[0021] That is, one end of the duct hose 34 is connected to the exhaust port (exhaust pipe) 22A of the duct main body 22, and the other end of the duct hose 34 is connected to the upper end of the collection section 30. Note that this exhaust port 22A is located above the upper end of the duct main body 22 when viewed from the front. Also, dust is collected between the inner circumferential surface at the downstream end of the duct main body 22 and the outer circumferential surface of the cylindrical section 23.

[0022] The collection unit 30 is supported at its approximate vertical center by a support bracket 32 ​​serving as a support member on a support column 14 disposed at the downstream end on one left-right side (the right side in the illustrated example) of the duct body 22. The lower end of the collection unit 30 is connected to the upper end of a flexible container bag 38 serving as a dust collection bag for containing the collected dust.

[0023] Meanwhile, a dust collector (not shown) of the grain dryer 17 is connected to an upper end portion of the downstream end portion of the duct main body 22 on the other side in the left-right direction (the left side in the figure) by a duct hose 36. That is, one end portion of the duct hose 36 is connected to an intake (intake pipe) 22B of the duct main body 22, and the other end portion of the duct hose 36 is connected to the dust collector of the grain dryer 17. Note that this intake 22B is also located above the upper end portion of the duct main body 22 in a front view.

[0024] Therefore, dust introduced from the dust extractor of the grain dryer 17 to the downstream end of the duct body 22 moves about 3 / 4 of a revolution along the inner circumferential surface of the downstream end of the duct body 22 in a straight line in the shortest distance in a side view due to the swirling flow generated inside the duct body 22, and is collected by the collection section 30. In this manner, the swirling flow inside the duct body 22 in this embodiment is a swirling flow (vortex flow) that rotates spirally in the counterclockwise direction when viewed from the front.

[0025] The swirling flow in the duct body 22 may rotate in a clockwise direction when viewed from the front, in which case one end of the duct hose 34 and one end of the duct hose 36 are connected inversely. Therefore, the exhaust port (exhaust pipe) 22A and the intake port (intake pipe) 22B have the same configuration (bilaterally symmetrical), and either the left or right side becomes the exhaust port 22A and the other left or right side becomes the intake port 22B according to the rotation direction of the swirling flow.

[0026] 2, a tapered section 24 is formed in a predetermined region on the inlet 26 side of the duct body 22, in which the inner diameter of the duct body 22 widens as it approaches the outlet 28 side. Inside the tapered section 24, an impeller 40 is provided which is always rotated at a constant high rotation speed inside the duct body 22 on the outlet 28 side of the tapered section 24 to change the exhaust direction of the exhaust gas introduced from the inlet 26 into a spiral, in other words to generate a swirling flow (vortex flow).

[0027] The impeller 40 has a rotation axis direction in the axial direction of the duct body 22, and is configured to include a pair of ring portions 42 of a predetermined width aligned in the rotation axis direction, and a plurality of blades 44 that axially connect the pair of ring portions 42, as shown in Fig. 3. The outer diameter of the ring portion 42 is formed to be close to the inner circumferential surface of the tapered portion 24 of the duct body 22.

[0028] On the other hand, the inner diameter of the ring portion 42 is formed to be equal to or larger than the inner diameter of the duct body 22 on the inlet 26 side than the tapered portion 24 (see Figs. 3 and 4). As the impeller 40 is configured to be rotatable in both forward and reverse directions as described below, the blades 44 are formed in a shape that can generate a swirling flow toward the outlet 28 side whether the impeller 40 rotates in the forward direction or the reverse direction.

[0029] The impeller 40 also has a cylindrical shaft portion 48, and the inner peripheral edge of each ring portion 42 and the outer peripheral surface at both axial ends of the shaft portion 48 are integrally connected at 120 degree intervals by three connecting portions 46. That is, the shaft portion 48 is supported by each ring portion 42 via each of the three connecting portions 46. The connecting portions 46 overlap each other in a front view (when viewed from the axial direction of the shaft portion 48) (see FIG. 4).

[0030] 2 to 4, one end of an elongated cylindrical rotating shaft 50 is fixed to the shaft portion 48, and a pulley 52 is fixed to the other end of the rotating shaft 50. The rotating shaft 50 is supported rotatably in both forward and reverse directions by a pair of support brackets 51 vertically attached from an upper portion of the inner circumferential surface of the duct body 22 on the inlet 26 side relative to the tapered portion 24, and the pair of support brackets 51 are disposed apart in the direction of the rotating shaft (the longitudinal direction of the rotating shaft 50, that is, the axial direction).

[0031] A drive unit 60 is provided on the upper portion of the duct body 22 on the inlet 26 side of the tapered portion 24. The drive unit 60 has a motor 58 that can be driven to rotate in both forward and reverse directions so that the rotation direction of the swirling flow can be selected according to the rotation direction of a fan 19 (see FIG. 5) serving as a blower in the grain dryer 17 to which the dust collector 10 is attached. A pulley 54 is fixed to the rotary drive shaft of the motor 58, and a V-belt 56 serving as a power transmission member is stretched between the pulley 54 and the pulley 52.

[0032] In other words, the impeller 40 can be driven to rotate in both forward and reverse directions by the rotation of the motor 58, and the rotation of the impeller 40 generates a swirling flow (vortex flow) in a counterclockwise or clockwise direction when viewed from the front inside the duct body 22. The rotation direction of the impeller 40 needs to match the rotation direction of the fan 19 in the grain dryer 17. This is because a vortex flow is generated in the exhaust air sent by the fan 19, and by matching the rotation direction of this vortex flow with the rotation direction of the swirling flow, the dust collection efficiency is improved.

[0033] Next, the operation of the dust collector 10 according to this embodiment having the above-mentioned configuration will be described.

[0034] As described above, a tapered section 24 is formed in a predetermined region on the inlet 26 side of the duct body 22 of the separation section 20, in which the inner diameter of the duct body 22 becomes wider as it approaches the outlet 28 side. Inside the tapered section 24 of the duct body 22, an impeller 40 is provided which is rotationally driven by a drive unit 60 to generate a swirling flow (vortex flow) inside the duct body 22 on the outlet 28 side of the tapered section 24.

[0035] 5, the tapered portion 24 and the impeller 40 can smoothly generate a swirling flow toward the exhaust direction (discharge port 28 side) inside the duct body 22, and the dust in the exhaust air introduced from the inlet 26 can be effectively separated by centrifugal separation using the swirling flow. In other words, according to the dust collector 10 of this embodiment, the dust collection performance can be improved regardless of the air volume of the fan 19 in the grain dryer 17.

[0036] Moreover, this impeller 40 is configured to include a pair of ring portions 42 aligned in the rotation shaft direction and a plurality of blades 44 connecting the pair of ring portions 42, and the inner diameter of the ring portions 42 is formed to be equal to or larger than the inner diameter of the duct body 22 on the inlet 26 side of the tapered portion 24. Therefore, there is no risk that the ring portions 42 of the impeller 40 will obstruct the exhaust air (exhaust air flow).

[0037] In addition, because the connecting parts 46 of the impeller 40 are configured to overlap each other in a front view, obstruction of the exhaust air (exhaust flow) is suppressed compared to a case in which the connecting parts 46 are configured not to overlap each other in a front view. In addition, because the impeller 40 is provided on the inlet 26 side (upstream side), a longer centrifugal separation section in the duct body 22 can be secured, which also improves dust collection performance.

[0038] Furthermore, because the impeller 40 is not for blowing air like the fan 19 but for generating a strong swirling flow (vortex flow), it has little resistance to the air blown (exhausted) by the fan 19 and can collect dust without affecting the drying performance (drying speed, etc.) of the grain dryer 17. In other words, because the dust collector 10 according to this embodiment can stably generate a swirling flow (vortex flow) for a long period of time, it can be installed regardless of the type of grain dryer 17 and can be used with grain dryers 17 with a wide range of stone numbers.

[0039] The separating section 20 is supported by four columns 14, and the collecting section 30 is supported by one of the four columns 14 via a support bracket 32. This increases the degree of freedom in installing the flexible container bag 38 attached to the lower end of the collecting section 30. Since the flexible container bag 38 collects dust, the replacement interval can be extended. Furthermore, the flexible container bag 38 can be attached and detached using a loading and unloading device such as a handlift or a forklift, which reduces the effort required to process the collected dust.

[0040] The dry dust collector 10 for a grain dryer according to this embodiment has been described above with reference to the drawings. However, the dry dust collector 10 for a grain dryer according to this embodiment is not limited to the one shown in the drawings, and the design can be modified as appropriate without departing from the gist of the present invention.

[0041] For example, the collection unit 30 may be configured to be supported by two of the four support columns 14 that are arranged on either the left or right side of the duct body 22 and spaced apart in the axial direction, via the support bracket 32. In other words, it is sufficient that the collection unit 30 is configured to be supported by at least one of the multiple support columns 14 (four in the illustrated example) via the support bracket 32. [Explanation of symbols]

[0042] 10 Dust collector (dry type dust collector for grain dryer) 14 Posts 20 Separation section 22 Duct body 24 Tapered section 26 Introduction 28 Outlet 30 Collection section 32 Support bracket (support member) 40 Impeller 42 Ring section 44 Feather

Claims

1. a separation section having an inlet into which exhaust gas discharged from a grain dryer is introduced, a duct body that separates dust from the exhaust gas introduced from the inlet by a swirling flow, and a discharge port that discharges the dust-removed exhaust gas from which dust has been separated by the duct body to the outside; a collector connected to an outlet that opens upward on the downstream side of the swirling flow at the discharge port side end of the duct body and that collects dust separated by the duct body; Equipped with The duct body has a tapered portion in a predetermined region on the inlet side, in which an inner diameter of the duct body becomes wider toward the outlet side, A dry dust collector for a grain dryer, wherein an impeller is provided inside the tapered portion of the duct body, and the impeller is rotationally driven to generate the swirling flow inside the duct body on the discharge outlet side relative to the tapered portion.

2. The impeller includes a pair of ring portions arranged in a rotation shaft direction and a plurality of blades connecting the pair of ring portions, 2. The dry dust collector for a grain dryer according to claim 1, wherein an inner diameter of the ring portion is equal to or larger than an inner diameter of the duct body on the inlet side of the tapered portion.

3. The separation portion is supported by a plurality of columns, 3. The dry dust collector for a grain dryer according to claim 1, wherein the collection section is supported by at least one of the plurality of supports via a support member.

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