Removal filter and removal device

Abstract

To manufacture a removal filter and a removal device in shorter time than a conventional technique.SOLUTION: A removal filter is a removal filter that removes a foreign substance from air containing the foreign substance. The removal filter includes a first metal filter, a second metal filter different from the first metal filter, and a joint portion that is welded to each of the first metal filter and the second metal filter to join the first metal filter and the second metal filter.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a removal filter and a removal device. [Background technology]

[0002] Patent Document 1 discloses a bag filter. This bag filter is placed in a dust collector into which high-temperature dust-laden air is introduced from an incinerator such as an incineration facility, and removes dust from the dust-laden air. This bag filter is composed of multiple separate filter sections, which are connected in series.

[0003] Incidentally, it is conceivable to sew adjacent filter portions together with fibers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-186781 Summary of the Invention [Problem to be solved by the invention]

[0005] However, sewing the filter sections together with fibers takes time.

[0006] The disclosed technology is directed to a removal filter and removal device that can be manufactured in less time than conventional techniques. [Means for solving the problem]

[0007] To achieve the above object, a first aspect of the technology of the present disclosure is a removal filter for removing foreign matter from air containing foreign matter. The removal filter includes a first metal filter, a second metal filter different from the first metal filter, and a joining portion that is welded to each of the first metal filter and the second metal filter to join the first metal filter and the second metal filter.

[0008] A second aspect is a removal filter for removing foreign matter from air containing foreign matter. The removal filter includes a first metal filter, a second metal filter different from the first metal filter, and a joint that joins the first metal filter and the second metal filter.

[0009] The joint portion is a part of one of the first metal filter and the second metal filter, and the other of the first metal filter and the second metal filter has a housing portion formed therein for housing the part.

[0010] The joining portion joins the first metal filter and the second metal filter together by welding the one part to the other part.

[0011] The removal device of the third aspect includes the removal filter of the first or second aspect. [Effects of the Invention]

[0012] The techniques of the present disclosure allow for shorter manufacturing times than conventional techniques. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an example of an operating state (dust collecting operation) of a dust collector according to an embodiment. [Figure 2] FIG. 2 is a vertical cross-sectional view showing an example of an operating state (during a sweeping-off operation) of the dust collector according to the embodiment. [Figure 3] FIG. 3 illustrates an example of the configuration of the removal filter according to the embodiment. [Figure 4] FIG. 4 is a diagram showing an example of how a first metal filter and a second metal filter are positioned in the elimination filter according to the embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of the configuration of a removal filter according to the first modified example. [Figure 6] FIG. 6 is a diagram showing an example of how the second metal filter and the second metal filter are joined together. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a removal filter according to the second modified example. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of a removal filter according to the third modified example. [Figure 9] FIG. 9 is a block diagram showing an example of the configuration of a dust collection system. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the technology of the present disclosure will be described with reference to the drawings.

[0015] [Embodiment Mode] Fig. 1 is a vertical cross-sectional view showing an example of the operating state (during dust collection operation) of the dust collector of this embodiment. Fig. 2 is a vertical cross-sectional view showing an example of the operating state (during sweeping operation) of the dust collector of this embodiment. For convenience of explanation, the upper side in Figs. 1 and 2 will be referred to as "upper (or upper side)" and the lower side as "lower (or lower side)".

[0016] 1 and 2 is installed in industrial facilities such as iron and steel manufacturing facilities as well as treatment facilities that process industrial waste and household garbage, and is used to purify dust-laden air AR1 discharged from incinerators, crushing equipment, and the like (hereinafter referred to as "incinerators"). This dust collector 1 includes a housing 2, which is the device main body, a capture unit 3 that captures foreign matter EM such as dust (including dirt) contained in the dust-laden air AR1, a blowout unit 4 that blows out treatment air AR3, and a suction unit that includes a suction fan (not shown) that sucks in purified air AR2. The configurations of the housing 2, capture unit 3, and blowout unit 4 will be described below. The dust collector 1 is an example of the "removal device" of the technology of the present disclosure.

[0017] In this embodiment, the shape of the housing 2 is a combination of a cylinder and a cone. The housing 2 is supported with its central axis O2 aligned vertically. The interior of the housing 2 is divided into two spaces, upper and lower, by a partition 23. The lower space is a first chamber 21 through which the dust-laden air AR1 passes. The upper space is a second chamber 22 through which purified air AR2, which has been purified by removing foreign matter EM from the dust-laden air AR1 using the removal filter 31, passes. Note that the shape of the housing 2 is not limited to a combination of a cylinder and a cone. For example, the housing 2 may be a truncated quadrangular pyramid, i.e., a columnar shape with a trapezoidal vertical cross section.

[0018] An inlet pipe 28 through which dust-laden air AR1 is introduced into the first chamber 21 of the housing 2 and an outlet pipe 52 through which purified air AR2 is discharged from the second chamber 22 of the housing 2 are connected to the side wall portion 27 of the housing 2.

[0019] The inlet pipe 28 is disposed below the partition wall 23 and communicates with the first chamber 21. The inlet pipe 28 is also connected to the incinerator on the side opposite the housing 2. As a result, the dust-laden air AR1 generated in the incinerator is introduced into the first chamber 21 of the housing 2 via the inlet pipe 28.

[0020] The exhaust pipe 52 is disposed above the partition wall portion 23 and communicates with the second chamber 22. As a result, the purified air AR2 in the second chamber 22 is exhausted through the exhaust pipe 52.

[0021] The bottom 24 of the housing 2 is tapered, i.e., has a quadrangular pyramid shape. This allows foreign matter EM to be concentrated and collected in the center of the bottom 24 when it falls as described below.

[0022] A discharge pipe 25 for discharging foreign matter EM is connected to the center of the bottom 24. The foreign matter EM collected in the center of the bottom 24 is quickly discharged to the outside via the discharge pipe 25. This prevents foreign matter EM from remaining in the housing 2.

[0023] In addition, a rotary valve 26 is installed in the discharge pipe 25. When the rotary valve 26 is operated, the foreign matter EM is forcibly discharged through the discharge pipe 25, thereby shortening the discharge time of the discharge pipe 25.

[0024] The trapping unit 3 has a plurality of removal filters 31 disposed between the first chamber 21 and the second chamber 22 and configured to remove foreign matter EM from the dust-laden air AR1. Note that although the number of removal filters 31 disposed is plural in this embodiment, it is not limited to this and may be, for example, one.

[0025] Each removal filter 31 is formed in the shape of a long cylinder (or rectangular tube) extending vertically. As the dust-containing air AR1 passes through the removal filter 31 from the outside to the inside, the foreign matter EM contained in the dust-containing air AR1 is captured by the removal filter 31, as shown in Fig. 1. This allows the foreign matter EM to be removed from the dust-containing air AR1, and therefore purified air AR2 is generated. This operation is called the "dust collection operation."

[0026] Furthermore, the partition wall 23 of the housing 2 is formed with through holes 231, the number of which is the same as the number of removal filters 31. The removal filters 31 are installed by passing through the through holes 231, and their upper parts are fixed to the partition wall 23. This allows the removal filters 31 to be suspended and extended from the partition wall 23, ensuring a sufficient area for capturing foreign matter EM.

[0027] As shown in Figure 1, when the removal filter 31 captures foreign matter EM, the foreign matter EM may adhere to the filter 31. In this case, depending on the degree of adhesion of the foreign matter EM, the removal filter 31 may become clogged. Therefore, as shown in Figure 2, the ejection unit 4 can unclog the removal filter 31. This operation is called the "shaking-off operation."

[0028] The jetting unit 4 introduces the processing air AR3 from a tank (not shown) that stores the processing air AR3 in a compressed state into an introduction pipe 42 inserted into the second chamber 22 of the housing 2. The introduction pipe 42 has a plurality of nozzles 421 that face the removal filter 31 via the through holes 231 of the partition wall unit 23. As shown in FIG. 2, each nozzle 421 can jet the processing air AR3 toward the inside of the removal filter 31 that faces the nozzle 421. This allows the foreign matter EM adhering to the removal filter 31 to be blown out and detached from the removal filter 31, thereby eliminating clogging of the removal filter 31.

[0029] The foreign matter EM that has been released from the removal filter 31 falls through the first chamber 21 of the housing 2 and reaches the bottom 24 of the housing 2. Thereafter, the foreign matter EM is collected in the center of the bottom 24 and is discharged from the discharge pipe 25.

[0030] Furthermore, the removal filter 31 is deformed and vibrated by the processing air AR3 from the nozzle 421. This phenomenon is also thought to be a cause of the foreign matter EM being released from the removal filter 31, and combined with the blowing of the processing air AR3, it allows the removal filter 31 to be smoothly and quickly unclogged.

[0031] The jetting unit 4 includes a high-pressure air jetting unit 44. The high-pressure air jetting unit 44 includes a high-pressure air supply passage 441, a pressure regulating valve 442, a header pipe 443, and an operating unit 445.

[0032] The high-pressure air ejection unit 44 is configured to be able to eject high-pressure processing air AR3 in pulses onto the inside of each removal filter 31 via the introduction pipe 42.

[0033] The high-pressure air ejection unit 44 is configured to adjust the pressure of the processing air AR3 via a pressure regulating valve 442 provided in the high-pressure air supply path 441, and then store the processing air AR3 in a header pipe 443. The high-pressure air ejection unit 44 can then eject the processing air AR3 stored in the header pipe 443 through the introduction pipe 42 onto the inside of each removal filter 31.

[0034] An air on-off valve 444 is provided inside the header pipe 443. The opening and closing of the air on-off valve 444 can be controlled by an actuator 445. The actuator 445 is electrically connected to a control unit (not shown). The control unit controls the actuator 445, which controls the opening and closing of the air on-off valve 444 to a set open / close state, so that the processing air AR3 stored inside the header pipe 443 can be sprayed in pulses through each nozzle 421 onto the inside of the removal filter 31.

[0035] Furthermore, when the pressure detection unit (not shown) detects that the difference between the pressure in the first chamber 21 and the pressure in the second chamber 22 is equal to or greater than a set value (threshold value), the jetting unit 4 determines that foreign matter EM has adhered to the removal filter 31 and caused clogging, and temporarily opens the high-pressure air jetting unit 44 (air on-off valve 444), which is currently closed. This allows processing air AR3 to be jetted in pulses from each nozzle 421, thereby clearing clogging of the removal filter 31. Note that the opening and closing timing of the high-pressure air jetting unit 44 is not limited to being controlled based on the detection result from the pressure detection unit, and may also be controlled based on the passage of time, for example. In other words, the high-pressure air jetting unit 44 may be temporarily switched from the closed state to the open state after a predetermined time has elapsed.

[0036] In this way, in the dust collector 1, when foreign matter EM adheres to the removal filter 31 and causes clogging of the removal filter 31, processing air AR3 can be jetted from the second chamber 22 side toward the first chamber 21 side toward the removal filter 31. This allows processing to unclog the removal filter 31, and therefore allows dust collection operation to continue stably.

[0037] Next, the removal filter 31 will be described.

[0038] Fig. 3 is a diagram showing an example of the configuration of elimination filter 31 according to the embodiment. Fig. 4 is a diagram showing an example of how first metal filter 31A1 and second metal filter 31B1 are positioned in elimination filter 31 according to the embodiment.

[0039] As shown in FIG. 3, the removal filter 31 includes a first metal filter 31A1, a second metal filter 31B1 different from the first metal filter 31A1, and a joint 31C that joins the first metal filter 31A1 and the second metal filter 31B1 by being welded to each of the first metal filter 31A1 and the second metal filter 31B1.

[0040] The joint 31C is a member that melts when heated to a predetermined temperature. The heat-resistant temperature of the joint 31C is lower than the heat-resistant temperatures of the first metal filter 31A1 and the second metal filter 31B1.

[0041] Here, a description will be given of combinations of materials for the first metal filter 31A1, the second metal filter 31B1, and the joint 31C. Specific examples of materials for the first metal filter 31A1, the second metal filter 31B1, and the joint 31C include iron (Fe), aluminum (Al), iron (Fe), copper (Cu), iron (Fe), stainless steel (SUS316), gold (Au), aluminum (Al), or copper (Cu), aluminum (Al).

[0042] The temperature of the dust-laden air AR1 when foreign matter is removed by the removal filter 31 is lower than the heat-resistant temperature of the joint 31C. Specifically, the heat-resistant temperature of the joint 31C is higher than the temperature of the dust-laden air AR1 when it is generated by the incinerator.

[0043] Next, the configuration of the joint 31C will be described in more detail.

[0044] The joint portion 31C comprises a positioning portion 31C1 arranged between the first metal filter 31A1 and the second metal filter 31B1, a first abutted portion 31C2 connected to the positioning portion 31C1 and against which an end of the first metal filter 31A1 abuts, and a second abutted portion 31C4 connected to the positioning portion 31C1 and against which an end of the second metal filter 31B1 abuts.

[0045] The joining portion 31C includes a first regulating portion 31C3 connected to the first abutment portion 31C2 and regulating the end of the first metal filter 31A1 from coming out of contact with the first abutment portion 31C2, and a second regulating portion 31C5 connected to the second abutment portion 31C4 and regulating the end of the second metal filter 31B1 from coming out of contact with the second abutment portion 31C4.

[0046] The placement portion 31C1, the first contact portion 31C2, and the first restriction portion 31C3 form a first holding portion, specifically a first groove 31CA, that holds the first metal filter 31A1. The placement portion 31C1, the second contact portion 31C4, and the second restriction portion 31C5 form a second holding portion that holds the second metal filter 31B1, specifically, a second groove 31CB.

[0047] The arrangement portion 31C1 also serves as a fusion weld portion that is welded to the first metal filter 31A1 and the second metal filter 31B1 by melting. The joint 31C is an annular member that includes a first holding portion that holds the first metal filter 31A1 and a second holding portion that holds the second metal filter 31B1. The first holding portion and the second holding portion are offset by a predetermined distance in a direction (that is, horizontal direction) perpendicular to the axial direction (that is, vertical direction).

[0048] As shown in FIG. 4, when the first metal filter 31A1 is moved toward the joint 31C along the direction F2, the joint 31C side of the first metal filter 31A1 is held in the first groove 31CA, and the first metal filter 31A1 is positioned.

[0049] By moving the second metal filter 31B1 toward the joint 31C along the direction F1, the joint 31C side of the second metal filter 31B1 is held in the second groove 31CB, and the second metal filter 31B1 is positioned.

[0050] In this manner, the first metal filter 31A1 and the second metal filter 31B1 are positioned relative to the joint 31C. Thereafter, the bonding portion 31C is heated to a predetermined temperature using a heater or the like. Specifically, the bonding portion 31C is heated to a temperature lower than the heat resistance temperatures of the first metal filter 31A1 and the second metal filter 31B1, but higher than the heat resistance temperature of the bonding portion 31C. The bonding portion 31C heated to the predetermined temperature melts. This bonds the first metal filter 31A1 and the second metal filter 31B1 together.

[0051] As described above, in this embodiment, the first metal filter 31A1 and the second metal filter 31B1 are joined simply by heating the joint 31C to a predetermined temperature, so the removal filter, and ultimately the dust collector 1, can be manufactured in a shorter time than with conventional techniques in which the first metal filter 31A1 and the second metal filter 31B1 are sewn together with fibers.

[0052] [Variations] Next, modifications of the above embodiment will be described. Since each of the following modifications has the same configuration as the above embodiment, the same reference numerals will be used to designate the same configuration, and the description of those components will be omitted, and only the differences will be described.

[0053] (First Modification) FIG. 5 is a diagram showing an example of the configuration of the removal filter 31H1 of the first modified example.

[0054] The removal filter 31H1 includes a joint portion 31D that is welded to each of the first metal filter 31A1 and the second metal filter 31B1 to join the first metal filter 31A1 and the second metal filter 31B1.

[0055] The joining portion 31D includes a contact portion 31D1. The contact portion 31D1 is disposed between the first metal filter 31A1 and the second metal filter 31B1. The contact portion 31D1 includes a first surface 31DS1 and a second surface 31DS2 facing the first surface 31DS1. An end of the first metal filter 31A1 contacts the first surface 31DS1 of the contact portion 31D1, and an end of the second metal filter 31B1 contacts the second surface 31DS2 of the contact portion 31D1.

[0056] The removal filter 31H1 is connected to the contact portion 31D1 and includes first clamping portions 31D21 and 31D22 that clamp the end of the first metal filter 31A1 so that the end of the first metal filter 31A1 does not come out of contact with the contact portion 31D1. The first clamping portions 31D21 and 31D22 are formed of a pair of plates.

[0057] The removal filter 31H1 is connected to the contact portion 31D1 and includes second clamping portions 31D31 and 31D32 that clamp the end of the second metal filter 31B1 so that the end of the second metal filter 31B1 does not come out of contact with the contact portion 31D1. The second clamping portions 31D31 and 31D32 are formed of a pair of plates.

[0058] The contact portion 31D1 and the first clamping portions 31D21 and 31D22 form a first holding portion that holds the first metal filter 31A1, specifically, a first groove 31DA.

[0059] The contact portion 31D1 and the second clamping portions 31D31 and 31D32 form a second holding portion that holds the second metal filter 31B1, specifically, a second groove 31DB.

[0060] The bonding portion 31D side of the first metal filter 31A1 is held in the first groove 31DA, and the first metal filter 31A1 is positioned. The end of second metal filter 31B1 on the bonding portion 31D side is held and positioned in second groove 31DB.

[0061] The contacted portion 31D1 also serves as a fusion welded portion that is welded to the first metal filter 31A1 and the second metal filter 31B1 by melting. The joint 31D is an annular member that includes a first holding portion that holds the first metal filter 31A1 and a second holding portion that holds the second metal filter 31B1. In the first modified example, the first holding portion and the second holding portion are not misaligned in a direction perpendicular to the axial direction.

[0062] As described above, in the first modified example, first metal filter 31A1 and second metal filter 31B1 are joined by welding joint portion 31D to each of first metal filter 31A1 and second metal filter 31B1.

[0063] Therefore, the first modified example allows the removal filter, and therefore the dust collector 1, to be manufactured in a shorter time than conventional techniques in which the first metal filter 31A1 and the second metal filter 31B1 are sewn together with fibers. Furthermore, in this embodiment, the first metal filter 31A1 and the second metal filter 31B1 are arranged to overlap (in the filter width direction), which tends to increase the thickness at the joint. However, in the first modified example, there is no need to overlap the first metal filter 31A1 and the second metal filter 31B1, so the thickness at the joint can be reduced (made uniform).

[0064] (Second Modification) Fig. 6 is a diagram showing an example of how a first metal filter 31A2 and a second metal filter 31B2 are joined together, and Fig. 7 is a diagram showing an example of the configuration of a elimination filter 31H2 of a second modified example.

[0065] 6 and 7, the elimination filter 31H2 includes a joint 31BC that joins the first metal filter 31A2 and the second metal filter 31B2. This joint 31BC is a part of one of the first metal filter 31A2 and the second metal filter 31B2. A storage section 31AC that stores a part of the first metal filter 31A2 or the second metal filter 31B2 (i.e., the joint 31BC) is formed on the other of the first metal filter 31A2 and the second metal filter 31B2.

[0066] As a specific example, the first metal filter 31A2 and the second metal filter 31B2 are joined by welding a part of one of the first metal filter 31A2 and the second metal filter 31B2 (i.e., the joint 31BC) to the inner surface of the other storage section 31AC of the first metal filter 31A2 and the second metal filter 31B2.

[0067] 6 and 7, one of the first metal filter 31A2 and the second metal filter 31B2 is the second metal filter 31B2, and the other of the first metal filter 31A2 and the second metal filter 31B2 is the first metal filter 31A2.

[0068] The storage portions 31AC are through holes formed in the first metal filter 31A2 on the side of the second metal filter 31B2, and a plurality of storage portions 31AC are formed. In the example shown in Fig. 6, four storage portions 31AC are formed.

[0069] As described above, in the second modified example, a portion of one of the first metal filter 31A2 and the second metal filter 31B2 (i.e., the joint portion 31BC) is welded to the other of the first metal filter 31A2 and the second metal filter 31B2, thereby joining the first metal filter 31A2 and the second metal filter 31B2.

[0070] Therefore, the second variant enables the removal filter, and thus the dust collector 1, to be manufactured in a shorter time than the conventional technique of sewing together a portion of one of the first metal filter 31A2 and the second metal filter 31B2 and the other of the first metal filter 31A2 and the second metal filter 31B2 with fibers. In addition, the joining portion 31BC and the inner surface of the storage portion 31AC are not limited to being welded together, and the joining portion 31BC and the inner surface of the storage portion 31AC may be joined together mechanically, with an adhesive, or by welding other joining materials.

[0071] (Third Modification) The third modified example has parts with the same configuration as the second modified example, so the same reference numerals are used to designate the same parts with the same configuration, and the description thereof will be omitted, and only the different parts will be described.

[0072] FIG. 8 is a diagram showing an example of the configuration of a removal filter 31H3 of the third modified example.

[0073] The storage sections 31AC of the second modified example are through holes formed on the second metal filter 31B2 side of the first metal filter 31A2, and four of them are formed. In contrast, the storage sections 31AD of the third modified example are non-through holes formed on the second metal filter 31B3 side of the first metal filter 31A3, and are formed around the entire circumference of the first metal filter 31A3 on the second metal filter 31B3 side.

[0074] As described above, in the third modified example, the first metal filter 31A3 and the second metal filter 31B3 are joined by welding a portion of one of the first metal filter 31A3 and the second metal filter 31B3 (i.e., the joint portion 31BD) to the inner surface of the other storage portion 31AD of the first metal filter 31A3 and the second metal filter 31B3.

[0075] Therefore, the third variant enables the removal filter, and thus the dust collector 1, to be manufactured in a shorter time than the conventional technique of sewing together a portion of one of the first metal filter 31A3 and the second metal filter 31B3 with the other of the first metal filter 31A3 and the second metal filter 31B3 with fibers. In addition, the joining of the joint 31BD and the inner surface of the storage section 31AD is not limited to welding, but the joining of the joint 31BD and the inner surface of the inner surface of the storage section 31AD may be mechanically joined, joined with an adhesive, or joined by welding other joining materials.

[0076] (Fourth Modification) Fig. 9 is a block diagram showing an example of the configuration of a dust collection system. As shown in Fig. 9, the dust collection system includes a dust collector 1H4, an incinerator 1000, and a cooling device 50 between the dust collector 1H4 and the incinerator 1000 that cools the dust-laden air AR1 generated by the incinerator 1000.

[0077] In the above-described embodiment to the third modified example, for example, in the above-described embodiment, the heat-resistant temperature of the joint 31C is higher than the temperature of the dust-containing air AR1 at the time when it is generated by the incinerator 1000.

[0078] In contrast, in the fourth modified example, the heat-resistant temperature of the joint 31C is lower than the temperature of the dust-laden air AR1 at the time it is generated by the incinerator 1000. Therefore, when the dust-laden air AR1 is introduced into the dust collector 1, specifically the removal filter 31, through the inlet pipe 28 while maintaining that temperature, the joint 31C melts, and the first metal filter 31A1 and the second metal filter 31B1 are separated.

[0079] Therefore, in the fourth modified example, the cooling device 50 cools the dust-containing air AR1 generated by the incinerator 1000 and introduces it into the dust collector 1, specifically, the removal filter 31.

[0080] This allows the temperature of the dust-containing air AR1 when the foreign matter is removed by the removal filter 31 to be lower than the heat-resistant temperature of the joint 31C.

[0081] The fourth modification allows the removal filter, and therefore the dust collector, to be manufactured in a shorter time than in the conventional technique of sewing the first metal filter 31A1 and the second metal filter 31B1 together with fibers. Furthermore, the fourth modification can prevent the first metal filter 31A1 and the second metal filter 31B1 from separating due to melting of the joint 31C.

[0082] Instead of using the cooling device 50, the length of the introduction pipe 28 may be set so that the temperature of the dust-containing air AR1 when the foreign matter is removed by the removal filter 31 is lower than the heat-resistant temperature of the joint 31C.

[0083] In light of the above disclosure, the following remarks are proposed:

[0084] (Appendix 1) A removal filter for removing foreign matter from air containing foreign matter, a first metal filter; a second metal filter different from the first metal filter; a joint portion that is welded to each of the first metal filter and the second metal filter to join the first metal filter and the second metal filter; Including, removal filters.

[0085] (Appendix 2) 2. The removal filter according to claim 1, wherein the joint is a member that melts when heated to a predetermined temperature.

[0086] (Appendix 3) The removal filter according to claim 1 or 2, wherein the heat-resistant temperature of the joint is lower than the heat-resistant temperatures of the first metal filter and the second metal filter.

[0087] (Appendix 4) The joint is a first holding portion that holds the first metal filter; a second holding portion that holds the second metal filter; The removal filter according to any one of Supplementary notes 1 to 3, comprising:

[0088] (Appendix 5) The joint is an arrangement portion arranged between the first metal filter and the second metal filter; a first contact portion connected to the placement portion and against which an end of the first metal filter is contacted; a second abutment portion connected to the placement portion and against which an end of the second metal filter abuts; The removal filter according to any one of Supplementary notes 1 to 4, comprising:

[0089] (Appendix 6) The joint is a first restricting portion connected to the first contacted portion and restricting the end of the first metal filter from coming out of contact with the first contacted portion; a second restricting portion connected to the second contacted portion and restricting the end of the second metal filter from coming out of contact with the second contacted portion; 6. The removal filter of claim 5, further comprising:

[0090] (Appendix 7) 7. The removal filter according to any one of appendix 1 to appendix 6, wherein the temperature of the air when the foreign matter is removed by the removal filter is lower than the heat-resistant temperature of the joint.

[0091] (Appendix 8) a temperature of the air generated by the generating unit that generates the air containing the foreign matter is higher than the heat-resistant temperature of the joint; The air generated by the generating unit is cooled by a cooling unit so that the temperature is lower than the heat-resistant temperature of the joint, and is introduced into the removal filter. The removal filter according to any one of Supplementary notes 1 to 6.

[0092] (Appendix 9) The joint is an abutment portion disposed between the first metal filter and the second metal filter, the abutment portion having a first surface and a second surface opposite to the first surface, an end of the first metal filter abutting against the first surface, and an end of the second metal filter abutting against the second surface; a first clamping portion connected to the contact portion and clamping the end side of the first metal filter so that the end of the first metal filter does not come out of contact with the contact portion; a second clamping portion connected to the contact portion and clamping the end side of the second metal filter so that the end of the second metal filter does not come out of contact with the contact portion; The removal filter according to any one of Supplementary notes 1 to 4, further comprising:

[0093] (Appendix 10) A removal filter for removing foreign matter from air containing foreign matter, a first metal filter; a second metal filter different from the first metal filter; a joint portion that joins the first metal filter and the second metal filter; Including, the joint portion is a part of one of the first metal filter and the second metal filter, a storage portion for storing the part is formed in the other of the first metal filter and the second metal filter, the joining portion joins the first metal filter and the second metal filter by welding the one portion to the other portion. Removal filter.

[0094] (Appendix 11) A removal device comprising the removal filter according to any one of Supplementary notes 1 to 10. [Explanation of symbols]

[0095] 1 dust collector 2. Case 21 First Room 22 Second Room 23 Bulkhead 231 Through hole 24 Bottom 25 Discharge pipe 26 Rotary Valve 27 Side wall 28 Introductory tube 3. Capture unit 31 Filter section 32 Discharge pipe 4 Spout part 42 Introductory tube 421 Nozzle 44 High-pressure air outlet 441 High-pressure air supply line 442 Pressure Regulating Valve 443 Header Pipe 444 Air on-off valve 445 Operating part 31 Removal Filter 31A1 First metal filter 31B1 Second metal filter 31C joint 31C1 Placement section 31C2 First contact portion 31C4 Second contact part 31C3 First Regulatory Section 31C5 Second Regulatory Section 31CA First Groove 31CB Second Groove

Claims

1. A removal filter for removing foreign matter from air containing foreign matter, a first metal filter; a second metal filter different from the first metal filter; a joint portion that is welded to each of the first metal filter and the second metal filter to join the first metal filter and the second metal filter; Including, removal filters.

2. The removal filter according to claim 1 , wherein the joint is a member that melts when heated to a predetermined temperature.

3. The removal filter according to claim 1 , wherein the heat-resistant temperature of the joint is lower than the heat-resistant temperatures of the first metal filter and the second metal filter.

4. The joint is a first holding portion that holds the first metal filter; a second holding portion that holds the second metal filter; The rejection filter of claim 1 , comprising:

5. The joint is an arrangement portion disposed between the first metal filter and the second metal filter; a first contact portion connected to the placement portion and against which an end of the first metal filter is contacted; a second abutment portion connected to the placement portion and against which an end of the second metal filter abuts; The rejection filter of claim 1 , comprising:

6. The joint is a first restricting portion connected to the first contacted portion and restricting the end of the first metal filter from coming out of contact with the first contacted portion; a second restricting portion connected to the second contacted portion and restricting the end of the second metal filter from coming out of contact with the second contacted portion; The rejection filter of claim 5 further comprising:

7. 2. The removal filter according to claim 1, wherein the temperature of the air when the foreign matter is removed by the removal filter is lower than the heat-resistant temperature of the joint portion.

8. a temperature of the air generated by the generating unit that generates the air containing the foreign matter is higher than the heat-resistant temperature of the joint; The air generated by the generating unit is cooled by a cooling unit so that the temperature is lower than the heat-resistant temperature of the joint, and is introduced into the removal filter. The removal filter according to claim 1 .

9. The joint is an abutment portion disposed between the first metal filter and the second metal filter, the abutment portion having a first surface and a second surface opposite to the first surface, an end of the first metal filter abutting against the first surface, and an end of the second metal filter abutting against the second surface; a first clamping portion connected to the contact portion and clamping the end side of the first metal filter so that the end of the first metal filter does not come out of contact with the contact portion; a second clamping portion connected to the contact portion and clamping the end side of the second metal filter so that the end of the second metal filter does not come out of contact with the contact portion; The rejection filter of claim 1 further comprising:

10. A removal filter for removing foreign matter from air containing foreign matter, a first metal filter; a second metal filter different from the first metal filter; a joint portion that joins the first metal filter and the second metal filter; Including, the joint portion is a part of one of the first metal filter and the second metal filter, a storage portion for storing the part is formed in the other of the first metal filter and the second metal filter, the joining portion joins the first metal filter and the second metal filter by welding the one portion to the other portion. Removal filter.

11. A removal device comprising the removal filter according to any one of claims 1 to 10.

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