Charged device

Abstract

A charged device (10) is provided with a conveying section (20), a nozzle section (30) provided above the conveying section (20), and a suction section (40) provided below the conveying section (20). The suction section (40) has a base section (41), a suction hole (44), and a suction passage (43). The base section (41) extends in a conveying direction (X) in which the conveying section (20) conveys a filter element (11). The suction hole (44) penetrates a portion of the base section (41) opposite the conveying section (20) in an up-down direction (Z). The suction passage (43) suctions water (W) via the suction hole (44). One end of the suction passage (43) is constituted by the suction hole (44). The other end of the suction passage (43) communicates with a suction device (45) that suctions the water (W). A portion of the suction passage (43) on the suction hole (44) side has a shape in which a flow passage cross-sectional area gradually increases as it moves away from the suction hole (44).

Description

Technical Field

[0001] This invention relates to a device for electrifying a filter element. Background Technology

[0002] In the past, in order to improve the dust collection efficiency of the filter element (e.g., non-woven) provided in the filter device, an electrification device was proposed to electrify the filter element (for example, see Patent Document 1).

[0003] Patent Document 1 describes a device as an electrifying device that blows fluid (specifically water) from a nozzle onto a filter element conveyed by a conveyor or similar transport unit. Furthermore, Patent Document 1 describes an electrifying device that draws fluid through a suction section (specifically, a slit-shaped suction hole) located below the filter element, which is immersed in the fluid. In both devices, the filter element is electrified by static electricity generated when the fluid passes through its interior.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-131485 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] To improve the charging efficiency of the above-mentioned charging device on the filter element, it is preferable to increase the flow rate of the fluid passing through the filter element. As with the above-mentioned charging device, by providing a slit-shaped suction hole in the suction section and drawing fluid through the suction hole, the suction hole acts as a throttling section that locally narrows the flow path of the fluid, thereby increasing the flow rate of the fluid.

[0009] However, in this case, the flow path of the fluid within the suction section widens at the downstream end of the suction orifice. Therefore, it is possible for stripping vortices or the like to form in the downstream portion of the suction section, reducing the flow velocity of the fluid within the suction section. This results in a decrease in the flow velocity of the fluid passing through the filter element. In this respect, the aforementioned electrified device has room for improvement.

[0010] Solution for solving the problem

[0011] The live-line device for solving the above-mentioned problem includes: a conveying section for conveying a filter element in a loaded state; a nozzle section disposed above the conveying section for spraying fluid downwards; and a suction section disposed below the conveying section, the suction section having: a base extending in the conveying direction of the conveying section for conveying the filter element; a suction hole penetrating the portion of the base opposite to the conveying section in a vertical direction; and a suction passage having one end formed by the suction hole and the other end connected to a suction device for suctioning the fluid, and the fluid being suctioned through the suction hole, the portion of the suction passage on the side of the suction hole forming a shape in which the flow path cross-sectional area gradually increases as it moves away from the suction hole.

[0012] In the above structure, fluid supplied from the nozzle passes through the interior of the filter element conveyed by the conveying unit and is drawn into the interior of the suction passage through the suction orifice of the suction unit. In this structure, the flow path cross-sectional area of ​​the suction passage expands downstream of the suction orifice. However, in this structure, the flow path cross-sectional area of ​​the suction passage gradually expands downstream of the suction orifice. Therefore, compared to a structure where the flow path cross-sectional area of ​​the suction passage abruptly increases downstream of the suction orifice, the generation of stripping vortices within the suction passage can be suppressed. This suppresses the decrease in fluid velocity inside the suction passage, thus suppressing the decrease in fluid velocity passing through the interior of the filter element and increasing that velocity. Therefore, according to the above structure, the charging efficiency of the charging device in charging the filter element can be improved. Attached Figure Description

[0013] Figure 1 This is a side sectional view of an embodiment of an electrified device.

[0014] Figure 2 This is a top view of the filter element, conveying section, and suction section.

[0015] Figure 3 This is a top view of the suction section.

[0016] Figure 4 It is the suction part Figure 3 The four-way view in the image.

[0017] Figure 5 It is the suction part Figure 3 The five-way view in the image.

[0018] Figure 6 It is an enlarged side sectional view showing the upper part of the partition wall and its surrounding area.

[0019] Figure 7 It is an enlarged side sectional view showing the suction port and its surrounding area of ​​the suction section.

[0020] Explanation of reference numerals in the attached figures

[0021] 10. Electrically charged device; 11. Filter element; 20. Conveying section; 21. Conveyor belt; 30. Nozzle section; 31. Fluid passage; 32. Pressurizing section; 33. Injection port; 40. Suction section; 41. Base; 43. Suction passage; 43A. Upper part; 43B. Lower part; 44. Suction hole; 45. Suction device; 51. Bend; 52. Downstream part; 53. Inner passage; 53A. End; 54. Outer passage; 54A. End; 55. Partition wall; 56. First surface; 57. Second surface; 57A. Upper part. Detailed Implementation

[0022] The following is for reference Figures 1 to 7 One embodiment of the energized device will be described.

[0023] like Figure 1 As shown, the charging device 10 of this embodiment is a device for charging the filter element 11 by utilizing the static electricity generated when a fluid (water W in this embodiment) passes through the interior of the filter element 11. The filter element 11 is made of a non-woven fabric that is breathable and liquid-permeable. The charging device 10 includes a conveying section 20, a nozzle section 30, and a suction section 40.

[0024] <Transportation Department>

[0025] like Figure 1 and Figure 2 As shown, the conveying section 20 is composed of a belt conveyor. The conveying section 20 has a conveyor belt 21. The conveyor belt 21 is breathable and liquid-permeable. A filter element 11 is placed on the conveyor belt 21. Through the operation of the conveying section 20, the conveyor belt 21 is moved in one direction with the filter element 11 placed on it. Figure 1 (Moves to the right in the middle). The conveying unit 20 conveys the filter element 11 with the filter element 11 mounted on the conveyor belt 21.

[0026] <Nozzle Section>

[0027] like Figure 1 As shown, the nozzle section 30 is located above the conveying section 20. When the filter element 11 is energized by the energizing device 10, water W is sprayed downward from the nozzle section 30.

[0028] A fluid passage 31 extending in the vertical direction Z is provided inside the nozzle section 30. One end of the fluid passage 31 ( Figure 1 The upper end of the fluid passage 31 is connected to the pressure conveying unit 32. The pressure conveying unit 32 is composed of a pressure pump that pressurizes water W. The other end of the fluid passage 31 ( Figure 1The lower end of the nozzle section 30 becomes the nozzle 33 for spraying water W. In this embodiment, water W supplied by the pressure conveying section 32 to the nozzle section 30 is sprayed downward from the nozzle 33 of the nozzle section 30 (more specifically, to the conveying section 20 and the filter element 11).

[0029] <Suction section>

[0030] The suction unit 40 is located below the conveying unit 20. When the filter element 11 is energized by the energizing device 10, water W is drawn in by the suction unit 40. The suction unit 40 has a base 41 and a suction passage 43.

[0031] <Base>

[0032] like Figure 1 and Figure 2 As shown, the base 41 conveys the filter element 11 in the conveying direction X of the conveying section 20. Figure 1 It extends in the left-right direction. The base 41 is formed into a generally rectangular flat plate that extends substantially parallel to the conveyor belt 21 of the conveying section 20. In this embodiment, the upper surface of the base 41 and the lower surface of the conveyor belt 21 are in a state of opposition.

[0033] A suction hole 44 is provided at the base 41. The suction hole 44 is a through hole that penetrates the base 41 in the vertical direction Z. The suction hole 44 opens relative to the lower surface of the conveyor belt 21. The suction hole 44 is located in the orthogonal direction Y (orthogonal to the aforementioned conveying direction X). Figure 2 A slit extending linearly in the vertical direction. The cross-sectional shape of the suction hole 44 is rectangular with the orthogonal direction Y as its long side.

[0034] In this embodiment, the spray nozzle 33 of the nozzle portion 30 and the suction hole 44 of the base 41 are arranged in the vertical direction Z. Furthermore, the nozzle portion 30 sprays water W such that the water W expands in a fan shape from the spray nozzle 33 in the orthogonal direction Y. In this embodiment, the nozzle portion 30 and the suction hole 44 are arranged such that the water W sprayed from the spray nozzle 33 is blown entirely into the opening of the suction hole 44.

[0035] <Suction Pathway>

[0036] like Figure 1 , Figures 3-5 As shown, the suction passage 43 forms a tubular channel through which water W passes. The suction passage 43 extends below the base 41. One end of the suction passage 43 ( Figure 1 The upper end of the suction passage 43 is formed by a suction hole 44. That is, the suction passage 43 extends such that the suction hole 44 serves as the upper opening of the suction passage 43. The other end of the suction passage 43 ( Figure 1The lower end of the pump is connected to the suction device 45. The suction device 45 is composed of a suction pump for suctioning water W. The suction passage 43 forms a passage for suctioning water W through the suction hole 44.

[0037] The portion of the suction passage 43 closest to the suction hole 44, i.e., the upper portion 43A of the suction passage 43, forms a shape where the flow path cross-sectional area gradually increases with distance from the suction hole 44. The inner surface of the upper portion 43A of the suction passage 43 is composed of a surface without steps. Figure 5 As shown, the upper part 43A of the suction passage 43 forms a tapered shape such that, as it moves away from the suction hole 44 formed by the slit, the suction passage 43 in the direction of the short side of the slit ( Figure 5 The width W1 of the passage (in the left and right directions) gradually increases. For example... Figure 4 As shown, the upper part 43A of the suction passage 43 forms a tapered shape such that, as it moves away from the suction hole 44 formed by the slit, the suction passage 43 in the long side direction of the slit ( Figure 4 The width W2 of the passage in the left and right directions gradually decreases.

[0038] like Figure 1 , Figures 3-5 As shown, the portion of the suction passage 43 furthest from the suction hole 44, namely the lower part 43B of the suction passage 43, is cylindrical. The lower part 43B of the suction passage 43 has a curved portion 51 and a downstream portion 52 sequentially on the upstream side (hereinafter referred to as the upstream side) from the direction of water flow W. The curved portion 51 starts from the lower end of the upper part 43A and bends the suction passage 43 at a predetermined angle (90 degrees in this embodiment) in one direction (…). Figure 1 The left side of the middle section extends in a curved manner. The downstream section 52 extends in a straight line in the conveying direction X.

[0039] <Partition Wall>

[0040] like Figure 1 , Figure 4 as well as Figure 5 As shown, a partition wall 55 is provided at the upper part 43A of the suction passage 43 to divide the interior of the suction passage 43 into two passages (inner passage 53 and outer passage 54). The partition wall 55 is formed into a generally flat plate shape extending in the vertical direction Z and the orthogonal direction Y. In this embodiment, the partition wall 55 is used to divide the interior of the suction passage 43 into an inner passage located in the bending direction of the curved portion 51 (…). Figure 1 The inner passage 53 on the left side and the outer passage on the curved side (in the left side) Figure 1 The outer pathway 54 (right side of the middle).

[0041] like Figure 1 and Figure 6As shown, the upper portion of the partition wall 55 has a tapered shape at its tip. Specifically, the first surface 56 of the partition wall 55 on the side of the inner passage 53 is formed by planes extending in the vertical direction Z and the orthogonal direction Y. On the other hand, the second surface 57 of the partition wall 55 on the side of the outer passage 54 has a rounded corner shape at its upper portion 57A. Furthermore, the portion of the second surface 57 of the partition wall 55 other than the upper portion 57A is formed by planes extending in the vertical direction Z and the orthogonal direction Y. In this embodiment, by forming the upper portion of the partition wall 55 into the aforementioned tapered shape, the upstream end 54A of the outer passage 54 ( Figure 6 The cross-sectional area S1 of the flow path is larger than the cross-sectional area S2 of the end 53A on the upstream side of the inner passage 53.

[0042] like Figure 1 , Figure 4 as well as Figure 5 As shown, in this embodiment, the partition wall 55 is provided such that the cross-sectional area of ​​the flow path downstream of the water W in the inner passage 53 (hereinafter referred to as the downstream side) is the same as the cross-sectional area of ​​the flow path downstream of the outer passage 54. Specifically, the upper part 43A of the suction passage 43 is formed into a shape symmetrical with a plane extending along the vertical direction Z and the orthogonal direction Y as its plane of symmetry. Furthermore, the partition wall 55 is provided in the upper part 43A of such a suction passage 43 in a manner extending within the aforementioned plane of symmetry. In this embodiment, the downstream portion of the inner passage 53 and the downstream portion of the outer passage 54 are formed into the same shape, specifically, a shape symmetrical with a plane extending along the vertical direction Z and the orthogonal direction Y as its plane of symmetry.

[0043] <Operating Mode of Live Device 10>

[0044] The operation of the energized device 10 in this embodiment will be described below.

[0045] When the filter element 11 is energized by the energizing device 10, the filter element 11 is placed on the conveyor belt 21, and the conveying unit 20 begins conveying the filter element 11. Furthermore, the pressure conveying unit 32 begins pressing the water W, and the suction unit 40 begins suctioning the water W.

[0046] Thus, water W is sprayed from the spray port 33 of the nozzle section 30, and the water W is blown from above onto the filter element 11 which is being transported in a state of being placed on the conveyor belt 21.

[0047] Water W is blown downwards through the interior of filter element 11. At this time, the filter element 11 is charged by the static electricity generated when the water W flows inside the filter element 11 (more specifically, the surface of the non-woven fibers).

[0048] After passing through the interior of the filter element 11, the water W flows downwards along the conveyor belt 21 and is then drawn in by the suction unit 40. As a result, the water W, along with the surrounding air A, flows into the suction passage 43 through the suction hole 44 of the base 41. Then, the water W and air A flow sequentially to the upper part 43A, the lower part 43B of the suction passage 43 (bend 51), and the downstream part 52, where they are transported downstream.

[0049] <Effects>

[0050] The effects of the energized device 10 in this embodiment will be explained below.

[0051] (1) In the energized device 10 of this embodiment, water W supplied by jetting from the nozzle 30 passes through the interior of the filter 11 conveyed by the conveying unit 20, and is drawn into the interior of the suction passage 43 via the suction hole 44 of the suction unit 40. Figure 7 As shown, in this embodiment, the flow path cross-sectional area of ​​the suction passage 43 is enlarged on the downstream side of the suction hole 44.

[0052] A charged device with a flow path cross-sectional area that abruptly increases at the downstream end of the suction hole 44 is designated as a "comparative example device". In the comparative example device, in the portion of the suction passage 43 downstream of the suction hole 44, the flow of water W and air A is significantly tortuous, making it prone to generating stripping flows and stripping vortices. Furthermore, if stripping vortices are generated in this portion, the flow velocity of water W in the suction passage 43 may decrease as a result.

[0053] like Figure 7 As shown, in the energized device 10 of this embodiment, the upper portion 43A of the suction passage 43 is formed in a shape where the flow path cross-sectional area gradually increases as it moves away from the suction hole 44. The energized device 10 of this embodiment has a structure in which the flow path cross-sectional area of ​​the upper portion 43A of the suction passage 43 gradually increases in the downstream portion of the suction hole 44.

[0054] By employing this structure, the phenomenon of significant bending of the partial flow of water W and air A on the downstream side of the suction hole 44 is suppressed (by...). Figure 7 (Arrow F1 in the diagram indicates an example). Therefore, according to this embodiment, compared to the device of the comparative example, the generation of stripping vortices in the downstream portion of the suction hole 44 can be suppressed. This suppresses the decrease in the flow rate of water W and air A in the upper part 43A of the suction passage 43, and thus suppresses the decrease in the flow rate of water W passing through the filter element 11 disposed on the upstream side of the suction passage 43, thereby increasing the flow rate. Consequently, the charging efficiency of the charging device 10 in charging the filter element 11 can be improved.

[0055] (2) The inner surface of the upper part 43A of the suction passage 43 is formed by a surface without steps. Therefore, compared with the case where steps are formed on the inner surface of the upper part 43A of the suction passage 43, water W and air A flow smoothly in the suction passage 43, and thus the reduction in the flow rate of water W and air A inside the suction passage 43 can be expected to be suppressed.

[0056] (3) A partition wall 55 is provided at the upper part 43A of the suction passage 43 to divide the interior of the suction passage 43 into an inner passage 53 located inside the bending direction of the curved portion 51 and an outer passage 54 located outside the bending direction. In this embodiment, the flow path cross-sectional area S1 of the upstream end 54A of the outer passage 54 is larger than the flow path cross-sectional area S2 of the upstream end 53A of the inner passage 53.

[0057] like Figure 1 and Figure 6 As shown, according to this embodiment, the opening area (the aforementioned flow path cross-sectional area S1) of the inlet portion of the outer passage 54 can be made larger than the opening area (the aforementioned flow path cross-sectional area S2) of the inlet portion of the inner passage 53. This allows water W and air A, which are drawn into the suction passage 43 via the suction hole 44, to flow into the outer passage 54 more easily than into the inner passage 53. Therefore, more water W and air A can flow into the outer passage 54 than into the inner passage 53.

[0058] Furthermore, by making the opening area of ​​the inlet portion of the outer passage 54 larger than the opening area of ​​the inlet portion of the inner passage 53, a flow F2 is formed in the upper part 43A of the suction passage 43, which actively draws air A into the outer passage 54. Figure 6 (The flow is indicated by the hollow arrow). Here, since the mass of air A is small, if a flow is formed in one direction, there is a tendency (property) to follow that flow in the same direction. In this embodiment, the air A flowing into the suction passage 43 through the suction hole 44 follows the aforementioned flow F2 in the same direction. As a result, most of the air A flowing into the suction passage 43 through the suction hole 44 flows into the outer passage 54.

[0059] like Figure 1 As shown, the air A passing through the outer passage 54 mainly flows in the portion of the bend 51 connected to the outer passage 54, that is, the portion outside the bending direction of the bend 51 (hereinafter referred to as the first portion Ao). Furthermore, the air A passing through the inner passage 53 mainly flows in the portion of the bend 51 connected to the inner passage 53, that is, the portion inside the bending direction of the bend 51 (hereinafter referred to as the second portion Ai). Therefore, in this embodiment, most of the air A passing through the bend 51 flows in the first portion Ao, outside the bending direction.

[0060] In the aforementioned curved section 51, the degree of curvature of the air flow A in the first part Ao on the outer side of the curvature direction is smaller than the degree of curvature of the air flow A in the second part Ai on the inner side of the curvature direction. Therefore, compared with the second part Ai on the inner side of the curvature direction, the pressure loss is more easily reduced in the first part Ao on the outer side of the curvature direction.

[0061] According to this embodiment, by providing the partition wall 55, a large amount of air in the air A flowing in the suction passage 43 can flow to the first part Ao outside the bending direction of the bend 51, i.e., the part where pressure loss is easily reduced. Therefore, for the suction passage 43 having the bend 51, water W and air A can flow downstream while suppressing pressure loss. As a result, it is desirable to suppress the decrease in the flow rate of water W and air A inside the suction passage 43.

[0062] (4) In this embodiment, the partition wall 55 is provided in such a way that the flow path cross-sectional area of ​​the downstream portion of the inner passage 53 is the same as the flow path cross-sectional area of ​​the downstream portion of the outer passage 54.

[0063] Here, assuming that the flow path cross-sectional area of ​​the inner passage 53 is increased while the flow path cross-sectional area of ​​the outer passage 54 is decreased, the pressure loss tends to increase because air A tends to flow in the second portion Ai inside the bending direction of the bend 51. Furthermore, assuming that the flow path cross-sectional area of ​​the inner passage 53 is decreased while the flow path cross-sectional area of ​​the outer passage 54 is increased, the air A tends to flow in the first portion Ao outside the bending direction of the bend 51, thus reducing the pressure loss. However, in this case, corresponding to the amount of reduction in the flow path cross-sectional area of ​​the inner passage 53, the flow velocity of air A flowing in the second portion Ai inside the bending direction of the bend 51 increases, thus the pressure loss in this second portion Ai tends to increase.

[0064] According to this embodiment, the flow path cross-sectional area of ​​the downstream portion of the inner passage 53 is the same as that of the downstream portion of the outer passage 54. Therefore, it is possible to suppress the increase in the flow velocity of air A in the second portion Ai inside the bending direction of the bend 51, and to increase the flow rate of air A in the first portion Ao outside the bending direction of the bend 51. As a result, pressure loss throughout the entire suction passage 43 can be suppressed evenly. Therefore, it is desirable to suppress the decrease in the flow velocity of water W and air A inside the suction passage 43.

[0065] (5) The suction hole 44 is a slit extending in the orthogonal direction Y. The upper part 43A of the suction passage 43 is shaped such that the passage width W1 of the suction passage 43 in the short side direction of the slit gradually increases as it moves away from the slit-shaped suction hole 44. The upper part 43A of the suction passage 43 is shaped such that the passage width W2 of the suction passage 43 in the long side direction of the slit gradually decreases as it moves away from the slit-shaped suction hole 44. According to this embodiment, by adopting such a structure, the shape of the suction passage 43 can be made to gradually change from a slit shape with greater pressure loss to a cylindrical shape with less pressure loss.

[0066] <Example of Change>

[0067] Furthermore, the above embodiments can be implemented by modifications as described below. The above embodiments and the following modifications can be combined with each other to implement them without technical inconsistencies.

[0068] The inner surface of the upper part 43A of the suction passage 43 is not limited to being composed of a surface without steps; it can be composed of a surface forming a step or a surface forming a wave shape, or any other shape. In short, the upper part 43A of the suction passage 43 only needs to have a shape in which the flow path cross-sectional area gradually increases as it moves away from the suction hole 44.

[0069] • As long as the flow path cross-sectional area S1 of the upstream end 54A of the outer passage 54 is larger than the flow path cross-sectional area S2 of the upstream end 53A of the inner passage 53, the shape of the upper part of the partition wall 55 can be arbitrarily changed. For example, the upper part of the partition wall 55 can be formed into a shape with a protrusion protruding towards the inner passage 53 or a shape bent towards the inner passage 53.

[0070] Alternatively, the partition wall 55 can be configured such that the flow path cross-sectional area of ​​the downstream portion in the inner passage 53 is different from that of the downstream portion in the outer passage 54. For example, the partition wall 55 can be formed into a curved shape, or the upper part 43A of the suction passage 43 can be formed into a non-symmetrical shape.

[0071] • The partition wall 55 can be omitted.

[0072] • The suction hole 44 can also be formed as a slit extending in a direction that intersects at an angle relative to the conveying direction X.

[0073] • The cross-sectional shape of the suction hole 44 can be arbitrarily changed to a circular cross-section or an elliptical cross-section, etc.

[0074] • As a filter element that is charged by an electric device, in addition to the filter element 11 made of non-woven fabric, a filter element made of woven fabric or a filter element made of woven fabric can also be used.

[0075] • The charging device 10 is not limited to using water W as the fluid for charging the filter element 11. The charging device described above can also be applied to charging devices that use liquids other than water W (such as oil) or to charging devices that use gases such as air.

[0076] <Postscript>

[0077] The above embodiments include the structures described in the following notes.

[0078] [Appendix 1] An electrified device comprising: a conveying section for conveying a filter element in a loaded state; a nozzle section disposed above the conveying section for spraying fluid downwards; and a suction section disposed below the conveying section, the suction section having: a base extending in the conveying direction of the conveying section for conveying the filter element; a suction hole penetrating the portion of the base opposite to the conveying section in a vertical direction; and a suction passage having one end formed by the suction hole and the other end connected to a suction device for suctioning the fluid, wherein the fluid is suctioned through the suction hole, and the portion of the suction passage on the side of the suction hole forms a shape in which the cross-sectional area of ​​the flow path gradually increases as it moves away from the suction hole.

[0079] [Appendix 2] According to the energized device described in [Appendix 1], wherein,

[0080] The inner surface of the portion of the suction passage near the suction hole is composed of a surface without steps.

[0081] [Appendix 3] According to the energized device described in [Appendix 1] or [Appendix 2], wherein,

[0082] The suction passage has a curved portion extending in one direction and a partition wall located upstream of the curved portion in the flow direction of the fluid, dividing the interior of the suction passage into an inner passage inside the curved portion and an outer passage outside the curved portion. The flow path cross-sectional area of ​​the upstream end of the outer passage in the flow direction is larger than the flow path cross-sectional area of ​​the upstream end of the inner passage in the flow direction.

[0083] [Appendix 4] According to the energized device described in [Appendix 3], wherein,

[0084] The flow path cross-sectional area of ​​the downstream portion of the fluid in the inner passage is the same as that of the downstream portion of the fluid in the outer passage.

[0085] [Appendix 5] The energized device according to any one of [Appendix 1] to [Appendix 4], wherein,

[0086] The suction hole is a slit extending in a direction intersecting the conveying direction, and the portion of the suction passage on the slit side is shaped such that the passage width of the suction passage gradually increases in the short side direction of the slit as it moves away from the slit, and gradually decreases in the long side direction of the slit as it moves away from the slit.

Claims

1. A live-line device, wherein, The energized device has the following features: The conveying unit conveys the filter element while it is loaded. The nozzle is located above the conveying section and sprays fluid downwards; as well as A suction section is located below the conveying section. The suction section has: The base extends in the conveying direction of the conveying section for conveying the filter element; A suction hole, which extends vertically through the portion of the base opposite to the conveying section; and The suction passage has one end formed by the suction hole and the other end connected to a suction device for suctioning the fluid, through which the fluid is suctioned. The portion of the suction passage near the suction orifice forms a shape in which the cross-sectional area of ​​the flow path gradually increases with distance from the suction orifice. The suction passage has a curved portion extending in one direction and a partition wall located upstream of the curved portion in the flow direction of the fluid, dividing the interior of the entire suction passage into an inner passage inside the curved portion and an outer passage outside the curved portion. The cross-sectional area of ​​the flow path at the upstream end of the flow direction of the outer passage is larger than the cross-sectional area of ​​the flow path at the upstream end of the flow direction of the inner passage.

2. The energized device according to claim 1, wherein, The inner surface of the portion of the suction passage near the suction hole is composed of a surface without steps.

3. The energized device according to claim 1, wherein, The flow path cross-sectional area of ​​the downstream portion of the fluid in the inner passage is the same as the flow path cross-sectional area of ​​the downstream portion of the fluid in the outer passage.

4. The energized device according to any one of claims 1 to 3, wherein, The suction hole is a slit extending in a direction intersecting the conveying direction. The portion of the suction passage on the slit side is shaped such that the passage width gradually increases in the short side direction of the slit as it moves away from the slit, and gradually decreases in the long side direction of the slit as it moves away from the slit.

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