Filter device

Abstract

To provide a filter device that can be reduced in pressure loss, regardless of flow velocity of air.SOLUTION: A filter device comprises: a pair of frames arranged with an interval in a ventilating direction; a plurality of support pillars each provided on opposite surfaces of the frames, arranged with intervals in an arranging direction that is orthogonal to the ventilating direction and provided at positions not overlapping with each other between the pair of frames when viewed from the ventilating direction; a filter main body hung across the plurality of support pillars to form a plurality of pleats; and a fixing member pressing the filter main body against the support pillars from a downstream side in the ventilating direction and from both sides in the arranging direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a filter device. [Background technology]

[0002] At nuclear power plants and the like, measures against volcanic ashfall are required depending on the location conditions. Specifically, in such areas, a filter device is provided at the inlet of the intake duct of the power plant's generator, etc., to prevent the intake of volcanic ash. A specific example of this type of filter device is described in Patent Document 1 below.

[0003] In the device disclosed in Patent Document 1, a membrane-like filter body is stretched between a number of guide pins (support columns) in a zigzag pattern. This causes the filter body to form a number of pleats. Air containing foreign matter such as volcanic ash flows into these pleats from the upstream side in the ventilation direction. The foreign matter is captured by the inner surface of the pleats. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5658223 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the filter body is simply hung on the support pole as described above, the downstream end of the pleats spreads out like a bag when the air flow speed increases. This can cause foreign matter to accumulate at the end, and the adjacent pleats can come into contact with each other. As a result, the pressure loss of the filter device increases, and it is possible that the desired ventilation performance cannot be achieved.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a filter device in which pressure loss is reduced regardless of air flow velocity. [Means for solving the problem]

[0007] In order to solve the above problems, the filter device of the present disclosure comprises a pair of frames arranged at intervals in the air passage direction, a plurality of support pillars provided on opposing surfaces of the frames, arranged at intervals in an arrangement direction perpendicular to the air passage direction and positioned so as not to overlap each other between the pair of frames when viewed from the air passage direction, a filter body that is suspended between the plurality of support pillars to form a plurality of pleats, and a fixing member that presses the filter body against the support pillars from the downstream side in the air passage direction and on both sides in the arrangement direction. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a filter device in which pressure loss is reduced regardless of the air flow velocity. [Brief description of the drawings]

[0009] [Figure 1] 1 is an external view showing a configuration of a filter device according to a first embodiment of the present disclosure. [Diagram 2] 2 is a cross-sectional view taken along the arrow II direction (height direction) in FIG. [Diagram 3] 2 is an enlarged view of a main portion showing the configuration of a filter body, a support column, and a fixing member according to the first embodiment of the present disclosure. FIG. [Figure 4] 1 is a cross-sectional view of a filter device according to a first embodiment of the present disclosure, viewed from the arrangement direction. [Diagram 5] 10 is a cross-sectional view showing a modified example of the filter device according to the first embodiment of the present disclosure. FIG. [Figure 6] 11 is a cross-sectional view of a filter device according to a second embodiment of the present disclosure, as viewed from the height direction. FIG. [Figure 7]11 is a cross-sectional view of a filter device according to a second embodiment of the present disclosure, viewed from the arrangement direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] First Embodiment (Configuration of filter device 1) Hereinafter, a filter device 1 according to a first embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 4. The filter device 1 is provided, for example, at the inlet of an intake duct of a power generation engine or a gas turbine in a power generation plant. In particular, it is suitably used in plants in areas where ashfall from volcanoes is expected.

[0011] As shown in FIG. 1, the filter device 1 includes a filter unit 10 and a housing 20. The filter unit 10 is a member for preventing the intrusion of foreign matter into downstream equipment by capturing only foreign matter while allowing air to flow through a filter body 23 described later. The housing 20 is a member for supporting the filter unit 10, and is, for example, rectangular parallelepiped-shaped. An opening 11 for exposing the filter unit 10 to the outside is formed on one surface of the housing 20. The opening 11 communicates with an intake duct of a downstream equipment through a flow path inside the housing 20. In addition, it is preferable that the filter unit 10 is a unit-shaped unit that is detachable from the housing 20. This is to facilitate replacement when foreign matter accumulates in the filter unit 10. In the following description, the direction in which air flows into the filter unit 10 through the opening 11 is called the "ventilation direction D1."

[0012] (Filter section 10) As shown in FIG. 2, the filter unit 10 includes a frame 21, support columns 22, a filter body 23, and a fixing member 24.

[0013] (Frame 21) A pair of frames 21 are provided with an interval therebetween in the air passage direction D1. Each frame 21 is in the form of a plate extending in a direction perpendicular to the air passage direction D1. The frame 21 is a member for maintaining the outer shape of the filter section 10, and is desirably formed of a metal material since it requires strength and rigidity. Although not shown in detail, the frame 21 is formed in a frame shape when viewed from the air passage direction D1 so as not to obstruct the flow of air, and a flow path for the flow of air is formed between the frames 21.

[0014] (Support pillar 22) A plurality of support pillars 22 are provided on opposing surfaces (opposing surfaces 21a) of the pair of frames 21. The support pillars 22 are members for fixing a filter body 23 (described later) to the frame 21. A plurality of support pillars 22 are provided at intervals in the extension direction of the frame 21. Hereinafter, the direction in which these support pillars 22 are arranged is simply referred to as the "arrangement direction D2."

[0015] More specifically, the support column 22 has a rod-shaped column body 31 and a stay 32 extending from the column body 31 toward the opposing surface 21a of the frame 21. The column body 31 extends in a height direction D3 that is perpendicular to the ventilation direction D1 and the arrangement direction D2. As an example, the cross-sectional shape of the support column 22 in the height direction D3 is rectangular. The stay 32 is provided to fix the column body 31 to the opposing surface 21a.

[0016] (Filter body 23) The filter body 23 is, for example, a metal mesh, and is a member for capturing foreign matter (such as volcanic ash) contained in the air flowing in from the upstream side in the air flow direction D1. When viewed from the height direction D3, the filter body 23 is folded in a zigzag shape between the frames 21 and fixed to the support columns 22. By being folded in a zigzag shape in this manner, the filter body 23 forms a plurality of pleats 40. The dimension of each pleat 40 in the arrangement direction D2 decreases from the upstream side to the downstream side in the air flow direction D1, and each pleat 40 has a triangular shape when viewed from the height direction D3.

[0017] (Fixing member 24) The fixing member 24 is a member for pressing the filter body 23 against the support column 22. As shown in FIG. 3, the fixing member 24 is C-shaped when viewed from the height direction D3. More specifically, the fixing member 24 has a main portion 51 and a pair of side portions 52. The main portion 51 faces the downstream end face of the support column 22 in the air flow direction D1. The side portions 52 extend from both ends of the main portion 51 in the arrangement direction D2 toward the downstream side in the air flow direction D1. It is desirable that the angle between the main portion 51 and the side portions 52 is determined according to the cross-sectional shape of the support column 22 (column body 31). In the example of FIG. 3, since the column body 31 is rectangular, the main portion 51 and the side portions 52 are perpendicular to each other when viewed from the height direction D3. In addition, the distance between the pair of side portions 52 is set to be slightly larger than the dimension of the column body 31 in the arrangement direction D2. This is because a margin is required between the fixing member 24 and the support column 22 to sandwich the filter body 23 .

[0018] Furthermore, the dimension of the side portion 52 in the air passage direction D1 is larger than the dimension of the support column 22 in the air passage direction D1. In other words, the upstream edge of the side portion 52 is located further upstream than the upstream edge of the support column 22. The filter body 23 is fixed by being sandwiched between the fixing member 24 and the support column 22. The main portion 51 presses the filter body 23 against the support column 22 from the downstream side of the air passage direction D1. The pair of side portions 52 press the filter body 23 against the support column 22 from both sides in the arrangement direction D2. In other words, the filter body 23 is pressed and fixed against the support column 22 so as to be covered from three different directions. The fixing member 24 and the support column 22 are provided on the frame 21 on both sides of the air passage direction D1, respectively, so that the shape of the pleats 40 of the filter body 23 is maintained. In other words, the pleats 40 are in a state in which a certain degree of tension is generated in the air passage direction D1.

[0019] As shown in Fig. 4, the fixing member 24 is provided in a part of the filter body 23 in the height direction D3. In other words, a plurality of fixing members 24 (two in the example of Fig. 4) are provided at intervals in the height direction D3. In the area where the fixing members 24 are not provided, the edge of the filter body 23 (pleats 40) is exposed to the outside. Since the filter body 23 itself formed of a metal mesh undergoes a certain degree of plastic deformation, even when the fixing members 24 are provided in only a part of the height direction D3 in this way, the filter body 23 in the area between the fixing members 24 also follows and can maintain the shape of the above-mentioned pleats 40.

[0020] (Action and effect) Next, a method of operating the filter device 1 will be described. When an engine or gas turbine provided downstream of the filter device 1 is driven, the intake system draws in air, causing air to flow toward the filter device 1 from the upstream side in the air flow direction D1. Foreign matter such as volcanic ash contained in the air is captured by the pleats 40 of the filter body 23. Specifically, the foreign matter gradually accumulates on the downstream edge of the pleats 40. On the other hand, the remaining air from which the foreign matter has been removed passes through the filter body 23 and flows downstream. This allows clean air to be supplied to the following machinery.

[0021] Here, in the conventional device of the same kind, the filter body 23 is generally only hung between the multiple support columns 22 in a zigzag shape. When the filter body 23 is only hung between the support columns 22, the downstream end of the pleats 40 spreads into a bag shape due to wind pressure when the air flow speed increases. Then, foreign matter accumulates at this end and bulges on both sides in the arrangement direction D2. Eventually, the adjacent pleats 40 may come into contact with each other due to the bulging. As a result, there was a problem that the flow path cross-sectional area between the pleats 40 is eroded, increasing the pressure loss of the filter device 1, and the desired ventilation performance cannot be obtained. In order to solve this problem, the above-mentioned configurations are adopted in this embodiment.

[0022] According to the above configuration, the filter body 23 is pressed against the support column 22 by the fixing member 24 from both sides in the arrangement direction D2 and downstream in the airflow direction D1. Therefore, the pleats 40 of the filter body 23 form a triangular shape having an acute angled corner as a vertex from the downstream side to the upstream side. Therefore, even if air containing foreign matter flows in from the upstream side of the airflow direction D1, the pleats 40 are unlikely to swell in the arrangement direction D2 due to the accumulation of the foreign matter. This reduces the possibility that the pleats 40 will come into contact with each other, so that the flow path cross-sectional area is unlikely to be damaged. Therefore, it is possible to avoid an increase in pressure loss of the filter device 1. On the other hand, if the fixing member 24 is not provided, the pleats 40 will swell toward both sides in the arrangement direction D2 due to the accumulation of foreign matter and the inflow of air, and the adjacent pleats 40 will come into contact with each other. Then, the air flow path cross-sectional area will be eroded, and the pressure loss of the filter device 1 will increase. As a result, the ventilation performance of the filter device 1 may be impaired. On the other hand, the above configuration reduces the possibility of such pressure loss occurring and stably maintains the ventilation performance of the filter device 1. Therefore, it becomes possible to continue to operate other machinery connected downstream of the filter device 1 more stably.

[0023] According to the above configuration, the dimension of the fixing member 24 in the air flow direction D1 is larger than the dimension of the support column 22. As a result, the fixing member 24 covers the filter body 23 up to the upstream side of the fixing member 24. Therefore, a large tension can be generated in the pleats 40 of the filter body 23. Therefore, when air flows into the pleats 40, the possibility that the pleats 40 will bulge on both sides in the arrangement direction D2 can be further reduced. As a result, the possibility that the pleats 40 will come into contact with each other is reduced, and the pressure loss of the filter device 1 can be further reduced. Therefore, it is possible to continue to operate other machinery connected to the downstream side of the filter device 1 more stably.

[0024] According to the above configuration, a plurality of fixing members 24 are provided at intervals in the height direction D3. This allows the filter body 23 to be fixed to the support column 22 with the minimum number of fixing members 24 required. This reduces the number of parts, making it possible to lower the manufacturing and maintenance costs of the device. In addition, since a gap is formed between the fixing members 24, air can flow downstream through the gap. This makes it possible to realize a filter device 1 in which pressure loss is minimized while maintaining the shape of the pleats 40.

[0025] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, the number of fixing members 24 described above is merely an example, and can be increased or decreased as appropriate depending on the design and specifications.

[0026] Furthermore, as shown in Fig. 5, the fixing member 24 can be provided over the entire area in the height direction D3. According to this configuration, the fixing member 24 is provided over the entire area of ​​the filter body 23 in the height direction D3. This allows the shape of the pleats 40 to be maintained over the entire area in the height direction D3, and bulging due to accumulation of foreign matter can be more actively prevented. This reduces the possibility that the pleats 40 will come into contact with each other, and makes it possible to further reduce the pressure loss of the filter device 1. This allows other machinery connected downstream of the filter device 1 to continue to operate more stably.

[0027] In addition, the cross-sectional shape of the support column 22 is not limited to the above-mentioned rectangle. As another example, a configuration in which only the upstream edge of the support column 22 (column body 31) in the air flow direction D1 is semicircular is considered. In this case, an example in which the support column 22 is formed by bending a plate-shaped member is considered. The support column 22 may also have a circular cross-sectional shape. With these configurations, stress concentration caused by tension at the edge of the filter body 23 (pleats 40) is alleviated, so that even if the air flow rate increases, the possibility of defects such as breakage occurring in the filter body 23 can be reduced. As a result, the filter device 1 can be stably operated for a long period of time with low maintenance frequency.

[0028] Second Embodiment Next, a second embodiment of the present disclosure will be described with reference to Figures 6 and 7. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0029] In this embodiment, the configuration of the fixing member 24 is different from that of the first embodiment. Specifically, as shown in Fig. 6, the fixing member 24 has a plate-shaped base 61 extending in the arrangement direction D2, and a plurality of comb-tooth portions 62 protruding further upstream from the upstream edge of the base 61.

[0030] The base 61 is fixed to the downstream frame 21. The base 61 is in the form of a plate having a thickness in the height direction D3. The multiple comb tooth portions 62 are integrally provided on the base 61. The multiple comb tooth portions 62 are arranged without gaps in the arrangement direction D2. The dimensions of each comb tooth portion 62 in the arrangement direction D2 increase from the upstream side to the downstream side, so that the comb tooth portions 62 are triangular when viewed from the height direction D3. The upstream edge of the comb tooth portion 62 reaches the support column 22 attached to the upstream frame 21. The comb tooth portions 62 press the pleats 40 from the downstream side, thereby maintaining the triangular shape of the pleats 40. In other words, the comb tooth portions 62 fill the gaps between the pleats 40 in accordance with the shape of the pleats 40.

[0031] 7, a plurality of fixing members 24 are provided at intervals in the height direction D3. That is, in the regions between the fixing members 24, the filter body 23 (the downstream edges of the pleats 40) are exposed to the outside.

[0032] (Action and effect) According to the above configuration, the fixing member 24 has a plurality of comb teeth 62 that fill the gaps between the pleats 40. The comb teeth 62 extend from the upstream side to the downstream side of the pleats 40 in the ventilation direction D1. Therefore, the shape of the pleats 40 can be maintained by the comb teeth 62 not only at the downstream end close to the support column 22 but also up to the upstream end. Therefore, even if air flows into the pleats 40, the possibility that the pleats 40 will spread to both sides in the arrangement direction D2 due to the accumulation of foreign matter can be further reduced. In particular, even if a large amount of foreign matter accumulates so as to approach the upstream end, the bulge of the pleats 40 is suppressed, so that the ventilation performance of the filter device 1 can be stably maintained for an even longer period of time. Therefore, it is possible to reduce the frequency of maintenance of the filter device 1, and it is possible to further improve operability.

[0033] (Other embodiments) Although each embodiment of the present disclosure has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not deviate from the gist of the present disclosure are also included.

[0034] For example, in each of the above embodiments, the filter device 1 is applied to an intake duct of a power plant. However, the filter device 1 can be applied to any mechanical device that requires clean air, regardless of its purpose.

[0035] Furthermore, the foreign matter to be removed by the filter device 1 is not limited to the above-mentioned volcanic ash, and it is possible to remove even finer foreign matter by changing the material and filter performance of the filter body 23. In addition, it is also possible to provide the above-mentioned filter body 23 in double or triple layers with a gap in between in the air passage direction D1. This makes it possible to capture and remove all of the fine foreign matter that could not be removed by the first filter body 23 by the other filter body 23 on the downstream side.

[0036] Furthermore, it is desirable that the dimensions of the filter body 23, such as the area as viewed from the air flow direction D1 and the thickness of the filter body 23, be appropriately set according to the design and specifications, and are not limited by the embodiments of the present disclosure.

[0037] In addition, in each of the above embodiments, an example has been described in which the fixing member 24 is provided on each of the upstream and downstream frames 21. However, it is also possible to adopt a configuration in which the fixing member 24 is provided only on the downstream frame 21. In this case, the number of parts can be reduced, making it possible to further reduce the manufacturing costs and maintenance costs of the device.

[0038] <Additional Notes> The filter device 1 according to each embodiment can be understood, for example, as follows.

[0039] (1) The filter device 1 of the first embodiment comprises a pair of frames 21 arranged at intervals in an air flow direction D1, a plurality of support pillars 22 respectively provided on opposing surfaces 21a of the frames 21, arranged at intervals in an arrangement direction D2 perpendicular to the air flow direction D1, and arranged at positions so as not to overlap each other between the pair of frames 21 as viewed from the air flow direction D1, a filter body 23 stretched between the plurality of support pillars 22 to form a plurality of pleats 40, and a fixing member 24 that presses the filter body 23 against the support pillars 22 from both the downstream side of the air flow direction D1 and the arrangement direction D2.

[0040] According to the above configuration, the filter body 23 is pressed against the support column 22 by the fixing member 24 from both the downstream side in the air flow direction D1 and the arrangement direction D2. Therefore, even if air containing foreign matter flows in from the upstream side in the air flow direction D1, the pleats 40 are unlikely to bulge in the arrangement direction D2 due to the accumulation of the foreign matter. This reduces the possibility that the pleats 40 will come into contact with each other, and makes it possible to avoid an increase in pressure loss.

[0041] (2) A filter device 1 according to a second aspect is the filter device 1 of (1), in which the dimension of the fixing member 24 in the air passage direction D1 is set to be larger than the dimension of the support column 22.

[0042] According to the above configuration, the dimension of the fixing member 24 in the air passage direction D1 is larger than the dimension of the support column 22. Therefore, a larger tension can be generated in the pleats 40 of the filter body 23. Therefore, when air flows into the pleats 40, the possibility that the pleats 40 will bulge on both sides in the arrangement direction D2 can be further reduced.

[0043] (3) A filter device 1 according to a third aspect is a filter device 1 according to (1) or (2), wherein the fixing member 24 has a plurality of comb-tooth portions 62 that fill the spaces between the pleats 40 in the air passage direction D1 and whose dimension in the arrangement direction D2 gradually increases from the upstream side to the downstream side in the air passage direction D1 in accordance with the shape of the pleats 40.

[0044] According to the above configuration, the fixing member 24 has a plurality of comb-tooth portions 62 that fill the gaps between the pleats 40. The comb-tooth portions 62 extend from the upstream side to the downstream side of the pleats 40 in the air passage direction D1. Therefore, the shape of the pleats 40 can be maintained by the comb-tooth portions 62 not only at the downstream end close to the support column 22 but also up to the upstream end.

[0045] (4) A filter device 1 in a fourth aspect is a filter device 1 in any one of the aspects (1) to (3), in which the fixing members 24 are provided at intervals in a height direction D3 perpendicular to the air flow direction D1 and the arrangement direction D2.

[0046] According to the above configuration, a plurality of fixing members 24 are provided at intervals in the height direction D3. This allows the filter body 23 to be fixed to the support column 22 with the minimum number of fixing members 24 required. This reduces the number of parts, making it possible to reduce the manufacturing costs and maintenance costs of the device.

[0047] (5) The filter device 1 in a fifth aspect is the filter device 1 of (1) or (2), wherein the fixing member 24 is provided over the entire area of ​​the filter body 23 in a height direction D3 perpendicular to the air flow direction D1 and the arrangement direction D2.

[0048] According to the above configuration, the fixing member 24 is provided over the entire area of ​​the filter body 23 in the height direction D3. Therefore, the shape of the pleats 40 can be maintained over the entire area in the height direction D3, and bulging due to accumulation of foreign matter can be more actively prevented. [Explanation of symbols]

[0049] REFERENCE SIGNS LIST 1 filter device 10 filter section 11 opening 20 housing 21 frame 21a opposing surface 22 support column 23 filter body 24 fixing member 31 column body 32 stay 40 pleats 51 main section 52 side section 61 base 62 comb-tooth section D1 ventilation direction D2 arrangement direction D3 height direction

Claims

1. A pair of frames arranged at an interval in the ventilation direction; a plurality of support columns provided on opposing surfaces of the frame, arranged at intervals in an arrangement direction perpendicular to the air passage direction, and provided at positions not overlapping with each other between the pair of frames as viewed from the air passage direction; a filter body that is stretched between the plurality of support columns to form a plurality of pleats; a fixing member for pressing the filter body against the support column from both sides in the arrangement direction and a downstream side in the air flow direction; A filter device comprising:

2. 2. The filter device according to claim 1, wherein a dimension of the fixing member in the air flow direction is set to be larger than a dimension of the support column.

3. The filter device according to claim 1 or 2, wherein the fixing member has a plurality of comb-tooth portions that fill the spaces between the pleats in the air passage direction and whose dimensions in the arrangement direction gradually increase from the upstream side to the downstream side in the air passage direction in accordance with the shape of the pleats.

4. The filter device according to claim 1 or 2, wherein the fixing members are provided in a plurality at intervals in a height direction perpendicular to the air flow direction and the arrangement direction.

5. The filter device according to claim 1 or 2, wherein the fixing member is provided over the entire area of ​​the filter body in a height direction perpendicular to the air flow direction and the arrangement direction.

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