Retainer

Abstract

Provided is a retainer that is light in weight and makes it possible to reduce a maintenance burden and an installation / removal burden. A retainer 3 supports a filter cloth 2 so that a bag filter dust collector 1 is formed. A retainer 3 according to the present application comprises: a core material 11 disposed at a position corresponding to the center of a space formed by the filter cloth 2; and a plurality of regulating members 13 fixed to the core material 11, the regulating members 13 regulating contraction of the filter cloth 2. Each regulating member 13 has a fixing part 21 for fixing the core material, a regulating part 22 for regulating contraction of the filter cloth 2 by coming into contact with the filter cloth, and an extension part 23 that is extended from the fixing part 21 and supports the regulating part 22. The regulating parts of the regulating members 22, 22 adjacent to each other in the vertical direction are independent of each other.

Description

Retainer

[0001] The present invention relates to a retainer that supports a filter cloth to form a bag filter type dust collector.

[0002] Bag filter dust collectors are installed in factories such as steelworks. A retainer supports bag-shaped filter cloths, and a bag filter dust collector is formed by arranging multiple filter cloths. Bag filter dust collectors use filter cloths to capture soot contained in exhaust gases from factories and other facilities. The gas that passes through the filter cloth is released to the outside.

[0003] Generally, factory exhaust gas is high temperature and pressure, and a one-way flow from inside the factory to the outside air occurs, which causes soot to adhere to the outer surface of the filter cloth, causing clogging.

[0004] Therefore, pulse jets are injected as needed to create a reverse flow, which knocks off the dust from the outer surface of the filter cloth. The dust that falls is collected and discharged, preventing clogging.

[0005] Generally, a retainer is formed of a plurality of vertical wires arranged in the circumferential direction and a plurality of vertically arranged rings connecting the vertical wires, forming a cylindrical or cage-like shape. The vertical wires and rings are made of metal and are fixed by welding (see Patent Document 1 (see FIG. 15A) (general example)).

[0006] A typical retainer is relatively heavy, and requires a large amount of labor during assembly and disposal.

[0007] Therefore, the inventor proposed using inner and outer bone wires as vertical wires and connecting the inner and outer bone wires with horizontal members (Patent Document 2) (see Figure 15B) (conventional example).

[0008] Because the entire structure is supported mainly by the inner rib wires, the number of outer rib wires can be reduced compared to conventional structures. This allows for a lighter structure. Also, because there are fewer outer rib wires, assembly is easy. Since no welding is required, removal is also easy.

[0009] In addition, it is less likely to clog and the frequency of filter cloth replacement can be reduced, making maintenance easier.

[0010] JP 2001-001093 A International Publication No. 2023 / 007759

[0011] The retainer (conventional example) proposed by the inventors achieved better results than expected, but the inventors investigated further weight reduction, ease of installation, and ease of maintenance.

[0012] The present invention has been made to solve the above-mentioned problems, and has an object to provide a retainer that is lightweight and reduces the burden of maintenance and the burden of installation and removal.

[0013] The present invention solves the above-mentioned problems by providing a retainer for supporting a filter cloth to form a bag filter-type dust collector. The retainer includes a core member disposed at a position corresponding to the center of the space defined by the filter cloth, and a plurality of restricting members fixed to the core member to restrict contraction of the filter cloth. The restricting members each have a fixing portion that fixes the core member, a restricting portion that contacts the filter cloth to restrict contraction of the filter cloth, and an extension portion that extends from the fixing portion and supports the restricting portion. The restricting portions of adjacent restricting members in the vertical direction are independent of each other.

[0014] In other words, the retainer of the present invention does not have the outer circumferential vertical wires that are required in general and conventional retainers, which results in further weight reduction, ease of installation, and ease of maintenance.

[0015] In the above invention, preferably, the regulating member has a plurality of guide portions extending from the regulating portion in the retainer insertion direction and in the diameter reducing direction.

[0016] This ensures ease of insertion even without the outer circumferential vertical wire.

[0017] In the above invention, preferably, the leading ends of the plurality of guide portions in the retainer insertion direction are connected to one another.

[0018] This makes it possible to prevent the regulation member from becoming unstable due to the pitch, even without the outer circumferential vertical wires.

[0019] In the above invention, preferably, a plurality of the guide portions are provided intermittently in the circumferential direction.

[0020] This ensures a sufficient cross section of the flow path between the guide portions.

[0021] In the above invention, preferably, a plurality of the restricting portions are provided intermittently in the circumferential direction.

[0022] This ensures that there are no contact areas between the restricting portions, which can be expected to have a micro-fluctuation effect on the filter cloth.

[0023] In the above invention, preferably, the core material is formed from a plurality of core rods, and one core rod is connected to the other core rods.

[0024] In the above invention, preferably, a joint structure is provided between the one core rod and the other core rod, for rotatably connecting the one core rod and the other core rod.

[0025] The absence of peripheral vertical wires allows for the application of a joint structure to the core material, resulting in improved workability.

[0026] In the above invention, preferably, a sleeve is provided which is slidable relative to the core rod and covers the joint structure.

[0027] The retainer of the present invention is lighter than the prior art.

[0028] The retainer of the present invention can reduce the maintenance burden and labor burden compared to the prior art.

[0029] Back filter type dust collecting device and the present application Retainer overview Retainer configuration Restriction member fixing example Restriction member modification Restriction member modification Restriction member modification Restriction member modification Restriction member modification Joint structure configuration Joint portion configuration modification Suspension support structure Connection example Connection example Details General example and conventional example

[0030] Overview Figure 1 is a conceptual diagram of a back filter type dust collector 1 and a retainer 3 of the present invention. The retainer 3 supports a bag-shaped filter cloth 2. One end of the filter cloth 2 is closed and the other end is open. There are no restrictions on the material of the filter cloth, but commonly used materials include polypropylene, polyester, polyamide, vinylon, and cotton.

[0031] A plurality of filter cloths 2 supported by a retainer 3 are arranged vertically in the longitudinal direction. An opening is provided in the top plate of the device, and the filter cloths 2 are inserted into the opening and suspended from the top plate. This completes the bag filter type dust collector 1.

[0032] 2 is a structural diagram of the retainer 3 of the present invention. The retainer 3 of the present invention is composed of a core material 11 and a restricting member 13. It does not have vertical wires (outer rib wires) corresponding to the inner periphery of the filter cloth 2, which are essential in general and conventional examples.

[0033] The core material 11 is disposed vertically at a position corresponding to the center of the space formed by the filter cloth 2. The core material 11 is a pipe-shaped fiber-reinforced plastic member or a metal member such as aluminum. It may be a resin-coated metal member, a heat-resistant resin member, or a rod-shaped member.

[0034] A plurality of regulating members 13 are fixed to the core material 11 at predetermined intervals (for example, at intervals of 0.5 m for a 6 m core material). The regulating members 13 regulate the contraction of the filter cloth 2 and maintain the shape of the filter cloth 2. There are no restrictions on the material of the regulating members 13, but heat-resistant resin is preferable. Metal or ceramics may also be used.

[0035] The retainer is used in several situations, including when assembling the retainer, inserting the filter cloth, during normal operation, when using the pulse jet, when replacing the filter cloth, and when discarding the retainer, and each of these situations presents challenges.

[0036] Basic Configuration The restricting member 13 of the present invention is characterized by its shape.

[0037] The restriction member 13 has a fixed portion 21, a restriction portion 22, and an extension portion 23, which is common to the conventional restriction member (horizontal member) (see FIG. 15B).

[0038] The fixing portion 21 has a space equivalent to the cross section of the core material 11, so that the core material 11 is inserted and fixed. The fixing method is not limited.

[0039] Figure 3 shows examples of fixing methods. Figure 3A shows an example of wedge fixing. Figure 3B shows another example of fixing. Other fixing methods such as welding are not excluded.

[0040] The wedge structure is formed by a wedge and a wedge receiver, which is an opening provided in the center of the restricting member 13. With the core material 11 inserted into the fixing portion 21, the wedge is inserted into the wedge receiver.

[0041] Another fixing method is to extend the fixing portion 21 in the axial direction and divide it into multiple (e.g., four) parts in the circumferential direction. This allows the extended parts to function as leaf springs. A protrusion is provided on the inside of the leaf spring, and fits into a recess provided in the core material 11.

[0042] The restricting portion 22 corresponds to the inner periphery of the cross section of the filter cloth, and is ring-shaped in the illustrated example. The restricting portion 22 is in almost continuous contact with the filter cloth 2, and restricts the contraction of the filter cloth 2.

[0043] The extensions 23 extend radially from the fixed portion 21 and support the restricting portions 22 .

[0044] The difference between the restricting member 13 of the present invention and the conventional horizontal member is whether or not they are connected by an outer periphery vertical wire. In other words, since the retainer of the present invention does not have an outer periphery vertical wire, the restricting portions 22, 22 of adjacent restricting members 13, 13 in the vertical direction are independent of each other (see FIG. 1B).

[0045] - Basic effect - The conventional example (see Figure 15B) is based on the general example (see Figure 15A), and the peripheral vertical wires are essential. In the process of considering improvements to the conventional example, the inventors noticed that the airflow during normal operation is gentle, and the peripheral vertical wires do not contribute much to maintaining the shape of the filter cloth 2. Therefore, they inferred that the peripheral vertical wires are not essential.

[0046] On the other hand, during pulse jet operation, the absence of the outer peripheral vertical wires increases the displacement of the filter cloth 2, and the dusting effect allows a large amount of dust to be brushed off. Furthermore, the filter cloth vibrates more during normal operation, suppressing dust adhesion. As a result, the number of pulse jet operations can be reduced. Furthermore, the number of filter cloth replacements can also be reduced. In other words, maintenance is easy.

[0047] Furthermore, since there is no outer peripheral vertical wire, the number of components is significantly reduced and the weight is significantly reduced, which reduces the labor burden when assembling the retainer and when disposing of the retainer.

[0048] While the conventional retainer requires the use of outer circumferential vertical wires, the retainer of the present invention does not have such outer circumferential vertical wires. As a result, the restricting member 13 may become unstable due to the pitch during assembly of the retainer, or the filter cloth 2 may be difficult to insert.

[0049] In contrast, the restricting member 13 of the present invention is characterized by further including guide portions 25. The plurality of guide portions 25 extend from the restricting portion 22 in the retainer insertion direction and in the diameter reducing direction. In the illustrated example, the diameter is gradually reduced.

[0050] However, care must be taken to ensure that the diameter reduction does not result in a significant reduction in the cross section of the flow path within the filter cloth 2. In the example shown, four guide portions 25 are provided intermittently in the circumferential direction, and the cross section of the flow path is secured between the guide portions 25, 25.

[0051] When inserting the filter cloth 2, the guide portion 25 functions as an insertion guide. This makes it easy to insert the retainer 3 into the filter cloth 2 even without the outer circumferential vertical wire. An image of the guide function has been added to the drawing.

[0052] The tips of the four guide portions 25 in the retainer insertion direction are connected to one another via connecting portions 26. The connecting portions 26 have a space equivalent to the cross section of the core material 11. The core material 11 passes through the space in the connecting portions 26. However, the connecting portions 26 do not necessarily have to fix the core material 11.

[0053] The connecting portion 26 can prevent the regulation member 13 from becoming unstable due to the pitch, even without the outer circumferential vertical wires. As a result, the filter cloth 2 can be easily inserted. The same applies when removing the filter cloth 2.

[0054] Furthermore, the guide portions 25 are linked together by the connecting portions 26, which also ensures ease of insertion of the filter cloth 2.

[0055] ~Modifications of the Restriction Member~ The restriction member 13 of the present invention can be modified in various ways within the scope of the technical concept of the present invention. Modifications are shown in Figures 4 to 9.

[0056] The restricting member 13 shown in Figure 4 does not have a connecting portion 26. The tips of the six guide portions 25 in the retainer insertion direction are positioned independently of one another around the core material 11. This makes it possible to some extent to prevent the restricting member 13 from becoming unstable due to pitch.

[0057] Furthermore, when the guide portion 25 comes into contact with an obstacle during insertion of the filter cloth 2, it functions as a cushion.

[0058] 5, a plurality of restricting portions 22 are provided at intervals in the circumferential direction of the restricting member 13. Non-contact portions 27 are provided between the restricting portions 22, 22 in the circumferential direction.

[0059] The restricting portion 22 comes into contact with the filter cloth 2 and restricts the contraction of the filter cloth 2, whereas the non-contact portion 27 has little contact with the filter cloth 2. The non-contact portion 27 allows the filter cloth 2 to be displaced, and a dusting effect can be expected.

[0060] Furthermore, since the filter cloth 2 is allowed to be displaced at the non-contact portion 27, the filter cloth 2 can also be expected to be displaced at the restriction portion 22. This makes it possible to prevent soot from concentrating and adhering to the portion corresponding to the restriction portion 22.

[0061] Furthermore, it is possible to prevent the filter cloth 2 from being worn only at a specific location.

[0062] 6, extension portions 23 extend radially from fixed portion 21 in the retainer insertion direction. Restriction portions 22 are located at the ends of extension portions 23. A plurality of guide portions 25 extend circumferentially from restriction portions 22 in the retainer insertion direction and in the diameter reduction direction.

[0063] The ends of the guide portions 25 in the retainer insertion direction are connected to each other via connecting portions 26. The connecting portions 26 do not need to fix the core material 11. Furthermore, the restricting portions 22 are connected to each other to ensure rigidity. The member connecting the restricting portions 22 functions as a non-contact portion 27.

[0064] 6, the restricting member 13 has a shape similar to a sphere, but care must be taken to ensure a sufficient cross section of the flow path.

[0065] The regulating member 13 shown in Fig. 7 is a modified example of the regulating member 13 shown in Fig. 6. While the non-contact portion 27 shown in Fig. 6 is linear, the non-contact portion 27 shown in Fig. 7 is arc-shaped with a convex center. This ensures the displacement of the filter cloth 2 by the non-contact portion 27 and the shaking effect.

[0066] 8 shows another example of the spherical restricting member 13. The extension portions 23 extend radially from the fixed portion 21 in the diagonal upward and downward directions. A plurality of crescent members are intermittently arranged in the circumferential direction. The crescent members are supported at the ends of the extension portions 23.

[0067] At this time, the upper half of the crescent member functions as part of the extension portion 23, the center of the crescent member functions as the restriction portion 22, and the lower half of the crescent member functions as the guide portion 25. Care must be taken to ensure a sufficient flow path cross section.

[0068] The upper side of the spherical regulating member 13 functions as a guide when removing the filter cloth 2. This makes it easy to remove the retainer 3 from the filter cloth 2 even without the outer circumferential vertical wire.

[0069] The restricting member 13 shown in Figure 9 is a modified example of the restricting member 13 shown in Figure 8. The crescent member is flat. The center of the chord of the crescent member functions as the restricting portion 22. The flat surface functions as the extension portion. The lower chord side functions as the guide portion 25. In the example of Figure 9, a non-contact portion 27 is added.

[0070] - Joint Structure - In a conventional retainer (see FIG. 15B), the core material 11 (inner bone wire material) is assumed to be a single, continuous, long rigid body.

[0071] In the conventional example, the outer periphery vertical wire is essential, whereas in the retainer of the present invention, there is no outer periphery vertical wire. Because the outer periphery vertical wire is essential in the conventional example, the idea of ​​applying a joint structure to the core material 11 did not occur to the user. Furthermore, in the conventional example, rigidity is expected from the core material 11, and for this reason too, the idea of ​​applying a joint structure to the core material 11 did not occur to the user.

[0072] In the process of considering improvements to the conventional example, the inventors noticed that the rigidity of the core material 11 is not as necessary as expected during normal operation or pulse jet. As a result, they arrived at the technical idea that there is no problem in applying a joint structure to the core material 11.

[0073] Figure 10 is a diagram showing the configuration of the joint structure 30. Figure 10A is a schematic diagram, and Figure 10B is a detailed example.

[0074] The core material 11 is divided and formed from a plurality of core rods 15. The joint structure 30 is provided between one core rod 15 and another core rod 15, and connects the one core rod 15 and the other core rod 15 in a rotatable manner.

[0075] A sleeve 31 is provided at a location corresponding to the joint structure 30 to cover the joint structure 30. This complements the linearity and rigidity of the core material 11. The material of the sleeve 31 may be the same as or different from that of the core material 11.

[0076] The sleeve 31 is slidable relative to the core rod 15, and when the joint is bent, the sleeve 31 is positioned at the end of one of the core rods 15, and when the joint is extended, the sleeve 31 slides and is fixed to the ends of both core rods 15, 15 by a fitting mechanism such as a recess and protrusion.

[0077] The joint structure 30 according to the example is formed by a wire 32, a ball 33, and a caulking 34.

[0078] The core rods 15, 15 are pipe-shaped and the wire 32 is inserted through the hollow inside. The ball 33 also has a hole formed in the diameter direction, and the wire 32 is also inserted through this hole.

[0079] The ball 33 is fitted into the end opening of the core rod 15 and is fixed by a suitable caulking 34. The wire 32 is flexible, so that the wire 32 between the balls 33, 33 can be deformed, allowing one core rod 15 to rotate relative to the other core rod 15.

[0080] 11 is a detailed view of another example of the joint structure 30. Two examples are shown.

[0081] The joint structure 30 shown in Figure 11A is formed from a U-shaped member 35 and a connecting ring 36. The core rods 15 are tubular, and the two U-shaped members 35 are inserted into and fixed in the core rods 15. In the extended joint state, the connecting ring 36 is positioned at a right angle to the tops of the U-shaped members 35 and engages with them.

[0082] One core rod 15 is rotated relative to the other core rod 15 via the connecting ring 36, resulting in a joint bending state.

[0083] 11B is formed from a pivot plate 37 and a connecting plate 38. The core rods 15, 15 are tubular, and the two pivot plates 37, 37 are inserted into and fixed in the core rods 15, 15. A rotation shaft 39 is provided on the pivot plate 37.

[0084] One end of the connecting plate 38 is rotatably connected to the rotation shaft 39 of one of the pivotal support plates 37, and the other end of the connecting plate 38 is rotatably connected to the rotation shaft 39 of the other pivotal support plate 37. When the joint is in an extended state, the connecting plate 38 and the pivotal support plates 37, 37 are fixed to each other by a fitting mechanism such as a recess and a protrusion.

[0085] When the fixing by the fitting mechanism is released, one core rod 15 becomes rotatable relative to the other core rod 15, and the joint is bent.

[0086] In both the general example (see FIG. 15A) and the conventional example (see FIG. 15B), the basic shape of the retainer is long, which makes it difficult to handle during transportation and installation. In particular, when fiber-reinforced plastic is used for the core material 11, it bends significantly, making it difficult to handle. As a result, workability is reduced. Furthermore, it is difficult to insert a long object through the opening in the top plate of the device, which makes workability difficult.

[0087] Since the retainer of the present invention does not have an outer circumferential vertical wire, a joint structure can be applied to the core material 11. As a result, it is possible to transport and load it in a bent joint state, improving workability. Furthermore, every time the core rod 15 is inserted through the opening in the top plate of the device, the joint can be extended, improving workability compared to inserting a long object.

[0088] In the present invention, the joint structure 30 is provided as appropriate depending on the length of the core material 11. For example, if the core material 11 is sufficiently short so as not to interfere with work, the joint structure 30 may not be applied.

[0089] - Hanging Support Structure - In a conventional retainer (see Figure 15B), the top of the outer periphery vertical wire has a hook structure, and this hook structure allows it to be hung and supported on the top plate (similar to Figure 1A).

[0090] While the conventional retainer requires a peripheral vertical wire, the retainer of the present invention does not have a peripheral vertical wire. Therefore, a new suspension support structure must be considered.

[0091] 12 is a diagram showing the configuration of the suspension support structure 40. In the conventional suspension support structure, the suspension support structure is a part of the outer periphery vertical wires, whereas in the suspension support structure 40 of the present invention, the suspension support structure is a part of the regulating member 13. Two examples are shown.

[0092] 12A is a plurality of hooks 41 erected on the upper surface of the restricting member 13. In the illustrated example, four hooks 41 are arranged in the circumferential direction so as to open outward. The retainer 3 of the present invention is suspended around the opening in the top plate of the device via the hooks 41.

[0093] 12B is a plurality of hanging plates 42 extending outward from the restricting member 13. In the illustrated example, four hanging plates 42 are arranged in the circumferential direction so as to open outward. The retainer 3 of the present invention is hung and supported around the opening in the top plate of the device via the hanging plates 42.

[0094] However, in the conventional example, when inserting the retainer through the opening in the top plate of the device and suspending it around the opening, there was a problem that the suspension support structure interfered with the periphery of the opening in the top plate of the device. This problem was particularly common when inserting a long object, as it was difficult to handle.

[0095] The suspension support structure 40 of the present invention is a part of the restricting member 13, and the restricting member 13 has a guide portion 25. If a problem occurs when inserting the retainer through the opening in the top plate of the device and suspending it around the opening, the guide portion 25 assists the insertion, thereby preventing the problem.

[0096] - Connection Structure - In the present application, it is assumed that the core rods 15, 15 are connected by the joint structure 30 to form the core material 11, but the connection structure is not limited to the joint structure 30.

[0097] 13 is a diagram showing the configuration of another connecting structure 50. The connecting structure 50 is a plug-in joint. The core rods 15, 15 are pipe-shaped.

[0098] For example, the core material 11 is transported and delivered with one end of the insertion joint 50 inserted into one core rod 15. Then, at the site, the other end of the insertion joint 50 is inserted into another core rod 15 to connect the core rods 15, and this process is repeated to form the core material 11.

[0099] Even when connecting using the plug joint 50, workability can be ensured.

[0100] 14 is a detailed structural diagram of the plug-in joint 50. The plug-in joint 50 is made up of one joint body 51 and two joint parts 52.

[0101] The joint part 52 is disposed on the central side of the joint body 51. In this state, the claws of the joint body 51 are easily deformed.

[0102] When connected, the joint part 52 moves in a direction away from the center of the joint body 51. In this state, deformation of the claws of the joint body 51 is suppressed.

[0103] REFERENCE SIGNS LIST 1 Bag filter type dust collector 2 Filter cloth 3 Retainer 11 Core material 13 Restricting member 15 Core rod 21 Fixed portion 22 Restricting portion 23 Extension portion 25 Guide portion 26 Connecting portion 27 Non-contact portion 30 Articulated structure 31 Sleeve 32 Wire 33 Ball 34 Caulking 35 U-shaped member 36 Connecting ring 37 Axle support plate 38 Connecting plate 39 Rotating shaft 40 Hanging support structure 41 Hook 42 Hook plate 50 Insert joint 51 Joint body 52 Joint part

Claims

1. A retainer that forms a bag filter type dust collector by supporting a filter cloth, comprising: a core material that is placed at a position equivalent to the center of a space formed by the filter cloth; and a plurality of regulating members that are fixed to the core material and regulate shrinkage of the filter cloth, wherein the regulating members have a fixing portion that fixes the core material, a regulating portion that comes into contact with the filter cloth and regulates shrinkage of the filter cloth, and an extension portion that extends from the fixing portion and supports the regulating portion, and the regulating portions of regulating members that are adjacent in the vertical direction are independent of each other.

2. A retainer according to claim 1, characterized in that the regulating member has a plurality of guide portions extending from the regulating portion in the retainer insertion direction and in the diameter reduction direction.

3. The retainer according to claim 2, wherein the leading ends of the plurality of guide portions in the retainer insertion direction are connected to each other.

4. The retainer according to claim 2, wherein a plurality of said guide portions are provided intermittently in the circumferential direction.

5. The retainer according to claim 2, wherein a plurality of said restricting portions are provided intermittently in the circumferential direction.

6. A retainer according to claim 1 or 2, characterized in that the core material is formed from a plurality of core rods, and one core rod is connected to another core rod.

7. A retainer according to claim 6, characterized in that it is provided with a joint structure between one core rod and another core rod, which connects the one core rod and another core rod in a rotatable manner.

8. The retainer according to claim 7, further comprising a sleeve that is slidable relative to said core rod and covers said joint structure.

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