Adsorption device and drying furnace

Abstract

This adsorption device (10) comprises a filter (40), a first frame (20), and a first sealing material (51). The filter (40) has a columnar shape having an adsorption carrier and can rotate around a central axis. The first frame (20) has a circular opening edge (OP) centered on the central axis of the filter (40). The first sealing material (51) is interposed between the filter (40) and the first frame (20). The first frame (20) has, on the outer side thereof with respect to the opening edge (OP), an annular outer peripheral wall (26) centered on the central axis. The filter (40) has an annular first protruding wall (45) at a location facing the outer peripheral wall (26) in the direction along the central axis. The first sealing material (51) is in contact with the inner peripheral surface of the outer peripheral wall (26) and the inner peripheral surface of the first protruding wall (45).

Description

Adsorption equipment and drying oven

[0001] The present disclosure relates to an adsorption apparatus and a drying oven.

[0002] The adsorption device described in Patent Document 1 includes a filter, a frame, and multiple sealing materials. The filter is approximately cylindrical. The filter carries an adsorbent. The filter also has multiple gaps that penetrate from one end face to the other end face. Air that flows in from one end face of the filter passes through the gaps and flows out to the other end face. At this time, specific adsorbable substances contained in the flowing in air are adsorbed by the adsorbent. The filter is also rotatable around its central axis as the rotation axis. The frame has a through hole. The open end face of the frame faces the end face of the filter with a gap therebetween.

[0003] The multiple seals are plate-shaped and have a main surface. Each seal is attached to the opening edge of the through-hole in the frame. Each seal extends from the opening edge of the frame toward the end face of the filter. A portion of the tip of each seal is in surface contact with the end face of the filter. That is, each seal seals the gap between the end face of the filter and the opening end face of the frame.

[0004] JP 2012-179582 A

[0005] In an adsorption device such as that described in Patent Document 1, air flowing into the filter passes through the through-holes in the frame and reaches the end face of the filter. As described above, each seal is in surface contact with the end face of the filter, and the wind pressure of the flowing air presses the seal against the end face of the filter. If the filter rotates in this state, the friction between the seal and the end face of the filter is likely to increase.

[0006] In order to solve the above problems, the present disclosure provides an adsorption device comprising: a columnar filter having an adsorption carrier carrying an adsorbent capable of adsorbing a specific substance and rotatable about a central axis; a frame having a circular opening edge centered on the central axis of the filter; and a sealant interposed between the filter and the frame, wherein the frame has an annular outer wall centered on the central axis and located outward from the opening edge, the filter has an annular protruding wall facing the outer wall in a direction along the central axis, and the sealant is in contact with the inner peripheral surface of the outer wall and the inner peripheral surface of the protruding wall. The present disclosure also provides a drying furnace comprising the above adsorption device, a drying chamber, and a duct connected to the frame of the adsorption device and through which gas exhausted from the drying chamber flows.

[0007] The frictional force between the sealing material and the end face of the filter is unlikely to become excessively large.

[0008] Fig. 1 is a perspective view of an adsorption device. Fig. 2 is a block diagram of a drying furnace. Fig. 3 is a front view of a filter. Fig. 4 is a front view of a first frame. Fig. 5 is a perspective view showing the positional relationship between the filter, frame, and sealing material when the filter and frame are viewed in cross section. Fig. 6 is a cross-sectional view of the filter, frame, and sealing material. Fig. 7 is an explanatory view explaining a sealing material in a modified example.

[0009] <One embodiment of the suction device> One embodiment of the suction device will be described below. Note that the drawings may show components enlarged to facilitate understanding. The dimensional ratios of the components may differ from those in the actual drawings or from those in other drawings.

[0010] (Overall Configuration of the Adsorption Device) As shown in Fig. 1, the adsorption device 10 includes a first frame 20, a second frame 30, and a filter 40. The adsorption device 10 has a generally cylindrical outer shape. That is, the first frame 20, the second frame 30, and the filter 40 all have generally cylindrical outer shapes with substantially the same diameter. Note that, hereinafter, a specific direction parallel to the central axis CA of the filter 40 is referred to as the positive direction PD. Of the directions parallel to the central axis CA, the direction opposite to the positive direction PD is referred to as the negative direction ND.

[0011] The filter 40 has a generally cylindrical outer shape. The filter 40 is located approximately in the center of the adsorption device 10. The filter 40 is located between the first frame 20 and the second frame 30.

[0012] The filter 40 includes an adsorption carrier CS and an outer frame OF. The adsorption carrier CS is a carrier that carries an adsorbent capable of adsorbing a specific substance. The adsorbent is, for example, a catalyst. The specific substance is a vaporized organic solvent. The adsorption carrier CS has a substantially cylindrical outer shape. Hereinafter, the end face of the adsorption carrier CS on the negative direction ND side is referred to as a first end face 41. The end face of the adsorption carrier CS on the positive direction PD side is referred to as a second end face 42.

[0013] The outer peripheral frame OF is a cylindrical frame that covers the outer periphery of the adsorption carrier CS. In other words, the adsorption carrier CS is fitted into the through-holes of the outer peripheral frame OF. The detailed structure of the outer peripheral frame OF will be described later.

[0014] As shown in Fig. 3, the adsorption carrier CS has a so-called honeycomb structure. That is, the adsorption carrier CS has a plurality of gaps G therein. The plurality of gaps G are connected from the first end face 41 to the second end face 42. Therefore, air passing through each flow passage of the first frame 20 and the second frame 30 can pass between the first end face 41 side and the second end face 42 side of the adsorption carrier CS. Note that in Fig. 3, the honeycomb structure of the first end face 41 is partially omitted. Furthermore, the honeycomb structure referred to here is not limited to a structure in which a plurality of three-dimensional structures are arranged, but also includes a structure in which a plurality of one or more types of three-dimensional structures are arranged.

[0015] Although not shown, the adsorbent carrier CS of the filter 40 is connected to a drive source such as an electric motor via a power transmission mechanism such as a gear mechanism. Based on the power from the drive source, the adsorbent carrier CS can rotate about the central axis CA relative to the first frame 20 and the second frame 30 at a speed of 5 to 15 revolutions per minute. The rotation direction is clockwise when viewed facing the forward direction PD. The outer peripheral frame OF that covers the adsorbent carrier CS can also rotate together with the adsorbent carrier CS. Therefore, the filter 40 can rotate about the central axis CA.

[0016] As shown in FIG. 1 , the first frame 20 is located on the negative direction ND side with respect to the filter 40. The first frame 20 is substantially cylindrical. The central axis of the first frame 20 coincides with the central axis CA of the filter 40. The first frame 20 has a through-hole that penetrates from the end on the negative direction ND side to the end on the positive direction PD side. That is, the first frame 20 has a circular opening edge OP centered on the central axis CA of the filter 40. The opening edge OP on the positive direction PD side of the through-hole faces a first end face 41 of the filter 40 with a gap therebetween.

[0017] As shown in Fig. 4, in more detail, the first frame 20 has a first cylindrical body 21, a second cylindrical body 22, and three partition walls 23. The first cylindrical body 21 is cylindrical. The central axis of the first cylindrical body 21 coincides with the central axis CA of the filter 40. The outer diameter of the first cylindrical body 21 is the same as the outer diameter of the filter 40. The opening edge OP of the first cylindrical body 21 is the opening edge OP of the first frame 20 described above.

[0018] The second cylindrical body 22 is cylindrical. The central axis of the second cylindrical body 22 coincides with the central axis CA of the filter 40. The outer diameter of the second cylindrical body 22 is smaller than the outer diameter of the first cylindrical body 21. Therefore, the second cylindrical body 22 is located closer to the central axis CA than the first cylindrical body 21.

[0019] The three partition walls 23 connect the inner peripheral surface of the first cylindrical body 21 and the outer peripheral surface of the second cylindrical body 22. The partition walls 23 are arranged at predetermined angular intervals in the circumferential direction around the central axis CA. The first cylindrical body 21, the second cylindrical body 22, and the three partition walls 23 define multiple flow passages. That is, the first frame 20 has a first flow passage P1, a second flow passage P2, and a third flow passage P3 as multiple through holes. When viewed in a direction along the central axis CA of the first frame 20, the opening of each flow passage has a substantially fan-shaped shape.

[0020] The first flow passage P1 is a through hole with the largest spatial volume among the three flow passages. The central angle of the fan shape of the first flow passage P1 is greater than 180 degrees. The second flow passage P2 is a through hole adjacent to the first flow passage P1 in the counterclockwise direction when viewed in the negative direction ND. The third flow passage P3 is a through hole adjacent to the second flow passage P2 in the counterclockwise direction and adjacent to the first flow passage P1 in the clockwise direction when viewed in the negative direction ND. In other words, the third flow passage P3 is located between the first flow passage P1 and the second flow passage P2. The central angle of the fan shape of the third flow passage P3 is approximately the same as the central angle of the fan shape of the second flow passage P2.

[0021] As shown in FIG. 1 , the second frame 30 is located on the positive direction PD side of the filter 40. Although not shown, the shape of the second frame 30 is similar to that of the first frame 20. That is, the second frame 30 is substantially cylindrical. The central axis of the second frame 30 coincides with the central axis CA of the adsorption device 10. The second frame 30 has a through-hole that penetrates from its end on the negative direction ND side to its end on the positive direction PD side. That is, the second frame 30 has a circular opening edge centered on the central axis CA of the filter 40. The opening edge of the through-hole on the negative direction ND side faces the second end surface 42 of the filter 40 with a gap therebetween. As shown in FIG. 2 , the second frame 30 has a plurality of through-holes, namely, a fourth flow passage P4, a fifth flow passage P5, and a sixth flow passage P6.

[0022] The size and shape of the opening of the fourth flow passage P4 on the negative direction ND side are the same as the size and shape of the opening of the first flow passage P1 on the positive direction PD side. The opening of the fourth flow passage P4 faces the opening of the first flow passage P1 across the adsorbent carrier CS. That is, the first flow passage P1 and the fourth flow passage P4 are aligned in a direction parallel to the central axis CA with the adsorbent carrier CS interposed therebetween.

[0023] The size and shape of the opening of the fifth flow passage P5 on the negative direction (ND) side are the same as the size and shape of the opening of the second flow passage P2 on the positive direction (PD) side. The opening of the fifth flow passage P5 faces the opening of the second flow passage P2 via the adsorbent carrier CS. That is, the second flow passage P2 and the fifth flow passage P5 are aligned in a direction parallel to the central axis CA via the adsorbent carrier CS.

[0024] The size and shape of the opening of the sixth flow passage P6 on the negative direction ND side are the same as the size and shape of the opening of the third flow passage P3 on the positive direction PD side. The opening of the sixth flow passage P6 faces the opening of the third flow passage P3 via the adsorbent carrier CS. That is, the third flow passage P3 and the sixth flow passage P6 are aligned in a direction parallel to the central axis CA via the adsorbent carrier CS.

[0025] 1 and 2, the adsorption device 10 is used as one component of a drying oven 100. The drying oven 100 is an apparatus for drying a coating material, for example, after the coating material has been applied to electronic components. At this time, the gas discharged from the drying chamber R of the drying oven 100 contains vaporized organic solvents and the like.

[0026] Specifically, as shown in FIGS. 1 and 2 , the drying oven 100 has a first duct D1 to a sixth duct D6. The first duct D1 is connected to an end of the first flow passage P1 on the negative direction (ND) side in the first frame 20. The second duct D2 is connected to an end of the second flow passage P2 on the negative direction (ND) side in the first frame 20. The third duct D3 is connected to an end of the third flow passage P3 on the negative direction (ND) side in the first frame 20. The fourth duct D4 is connected to an end of the fourth flow passage P4 on the positive direction (PD) side in the second frame 30. The fifth duct D5 is connected to an end of the fifth flow passage P5 on the positive direction (PD) side in the second frame 30. The sixth duct D6 is connected to an end of the sixth flow passage P6 on the positive direction (PD) side in the second frame 30.

[0027] 1 and 2 show the connection relationship between each frame and each duct. In reality, the first duct D1 is connected to the opening on the negative direction ND side of the first flow passage P1 via a cover, an adapter, a seal member, etc. Therefore, there is no gap between the first duct D1 and the opening on the negative direction ND side of the first flow passage P1. In other words, when gas flows from the first duct D1 to the first flow passage P1, gas leakage from between the two is prevented. This also applies to the connection relationship between the other ducts and flow passages. Known configurations can be used as appropriate for these connection configurations.

[0028] The drying furnace 100 includes a first fan B1, a second fan B2, and a heater HE. The first fan B1 blows gas containing an organic solvent exhausted from the drying chamber R into a first duct D1. The gas blown into the first duct D1 flows through the first duct D1 toward the forward direction PD. The gas then passes through the first flow passage P1 from the reverse direction ND side of the first duct D1 and through the adsorbent carrier CS. The organic solvent components contained in the gas are adsorbed onto the adsorbent material as they pass through the adsorbent carrier CS. The gas from which the organic solvent components have been removed is then exhausted to the fourth duct D4 through a fourth flow passage P4 of the second frame 30.

[0029] The second fan B2 blows air that does not contain organic solvents into the second duct D2. The gas supplied to the second duct D2 flows through the second duct D2 toward the forward direction PD. Therefore, the air passes from the negative direction ND side of the second duct D2 through the second flow passage P2, the adsorbent carrier CS, the fifth flow passage P5, and the fifth duct D5, in that order. Note that the air absorbs heat from the adsorbent carrier CS as it passes through the gap G of the adsorbent carrier CS. Therefore, the temperature of the air flowing through the fifth flow passage P5 and the fifth duct D5 rises to approximately 60°C.

[0030] The heater HE is supplied with air circulating through the fifth duct D5. The heater HE heats the supplied gas, turning it into hot air at approximately 200°C. This hot air is then supplied from the heater HE to the sixth duct D6. The hot air then passes through the sixth duct D6, the sixth flow passage P6 of the second frame 30, and the interior of the adsorbent carrier CS. At this time, the portion of the adsorbent carrier CS facing the sixth flow passage P6 of the second frame 30 is exposed to the hot air flowing through the sixth flow passage P6. The adsorbent carrier CS is rotating relative to the second frame 30. Therefore, the portion of the adsorbent carrier CS facing the sixth flow passage P6 of the second frame 30 has adsorbed the organic solvent contained in the gas from the first duct D1. Therefore, the hot air desorbs the organic solvent adsorbed on the adsorbent from the adsorbent. The hot air containing the desorbed organic solvent passes through the third flow passage P3 and the third duct D3 and is supplied to a predetermined recovery device 110. In this way, the adsorption device 10 can concentrate and recover the organic solvent from the gas exhausted from the drying chamber R.

[0031] (Regarding the Outer Wall, Protruding Wall, and Sealing Material) Next, a description will be given of the sealing structure between the first frame 20 and the filter 40. As shown in Fig. 4 , the first frame 20 has a first recess 24, a second recess 25, an outer wall 26, and an inner wall 27.

[0032] The first recess 24 is a depression in the end surface of the first cylindrical body 21 facing the filter 40. The first recess 24 extends in an annular shape centered on the central axis CA. The outer peripheral wall 26 is one of the walls defining the first recess 24 and is located on the outer side of the first recess 24. Therefore, the outer peripheral wall 26 is an annular wall centered on the central axis CA and located on the outer side of the opening edge OP of the first cylindrical body 21.

[0033] The second recess 25 is a depression in the end surface of the second cylindrical body 22 facing the filter 40. The second recess 25 extends in an annular shape centered on the central axis CA. The inner circumferential wall 27 is one of the walls defining the second recess 25 and is located on the central axis CA side of the second recess 25. Therefore, the inner circumferential wall 27 is an annular wall centered on the central axis CA and located inside the opening edge OP of the first cylindrical body 21.

[0034] As shown in Fig. 3, the filter 40 has a first groove portion 43, a second groove portion 44, a first protruding wall 45, and a second protruding wall 46. In Fig. 3, the walls that define the first groove portion 43 and the walls that define the second groove portion 44 are indicated by thick lines.

[0035] The first groove 43 is a recess in the end face of the filter 40 that faces the first frame 20 of the outer peripheral frame OF, i.e., in the first end face 41. The first groove 43 extends in an annular shape centered on the central axis CA. The first groove 43 faces the first recess 24 of the first cylindrical body 21 in the direction along the central axis CA.

[0036] The first protruding wall 45 is one of the walls that define the first groove portion 43 and is located on the outer side of the first groove portion 43. Therefore, the first protruding wall 45 is an annular wall that faces the outer peripheral wall 26 of the first frame 20 in the direction along the central axis CA.

[0037] The second groove 44 is a recess in the first end surface 41 of the adsorption carrier CS. The second groove 44 extends in an annular shape centered on the central axis CA. The second groove 44 faces the second recess 25 of the second cylindrical body 22 in the direction along the central axis CA.

[0038] The second protruding wall 46 is one of the walls that define the second groove portion 44 and is located on the central axis CA side of the second groove portion 44. Therefore, the second protruding wall 46 is an annular wall that faces the inner circumferential wall 27 of the first frame 20 in the direction along the central axis CA.

[0039] As shown in Fig. 4, the suction device 10 includes a first seal material 51 and a second seal material 52. In Fig. 4, the first seal material 51 and the second seal material 52 are indicated by two-dot chain lines.

[0040] The first seal 51 is a strip-shaped spiral spring wound in a spiral shape. This type of spiral spring is also called a power spring. The main surface of the first seal 51 faces a direction perpendicular to the winding axis. The material of the first seal 51 is stainless steel for springs. For example, the material of the first seal 51 is cold-rolled steel strip for springs (Cold Strip Spring, CSP). The spiral spring is not limited to one wound multiple times, but can be one wound one or more times, i.e., 360 degrees or more.

[0041] 5 and 6 , the first sealant 51 is interposed between the outer frame OF and the first frame 20. Specifically, the first sealant 51 is located in the space defined by the first recess 24 and the first groove 43. The first sealant 51 is in contact with the inner circumferential surface of the outer circumferential wall 26 of the first frame 20 and the inner circumferential surface of the first protruding wall 45 of the outer circumferential frame OF. The inner circumferential surface of the outer circumferential wall 26 refers to the surface of the outer surface of the outer circumferential wall 26 that faces the central axis CA. The inner circumferential surface of the first protruding wall 45 refers to the surface of the outer surface of the first protruding wall 45 that faces the central axis CA.

[0042] As shown in FIG. 4 , the first seal 51 is wound around the central axis CA for one or more revolutions. In this embodiment, the first seal 51 is wound approximately two revolutions. Here, the rotation direction of the first seal 51 when tracing from the inner peripheral end to the outer peripheral end is defined as the winding direction of the first seal 51. The winding direction of the first seal 51 is the same as the rotation direction of the filter 40. That is, when the adsorption device 10 is viewed in the negative direction ND, the filter 40 rotates counterclockwise. When the adsorption device 10 is viewed in the negative direction ND, the first seal 51 is wound counterclockwise from the inner peripheral end to the outer peripheral end. Note that because the first seal 51 is wound around one or more revolutions, the total length of the first seal 51 is approximately 3.14 times or more the diameter of the outer peripheral frame OF. The "total length" refers to a length including the overlapping portions of the first sealing material 51 that are wound in multiple layers.

[0043] The first seal 51 is interposed between the outer frame OF and the first frame 20 in a tightly wound elastically compressed state. The "tightly wound elastically compressed state" refers to a state in which the seal is elastically compressed so that its diameter is smaller than when no external force is acting on the seal. Therefore, the first seal 51 attempts to increase in diameter due to its own restoring force. As a result, the outer main surface of the first seal 51 is pressed against the inner circumferential surface of the outer circumferential wall 26 of the first frame 20 and the inner circumferential surface of the first protruding wall 45 of the filter 40.

[0044] Due to this positional relationship, the first seal 51 seals the gap between the end face of the first cylindrical body 21 facing the outer peripheral frame OF and the first end face 41 of the outer peripheral frame OF from the outer peripheral side of the opening of the first cylindrical body 21. In other words, air flowing from each flow passage of the first frame 20 to the gap G of the outer peripheral frame OF is prevented from leaking from the gap to the outside of the adsorption device 10. Furthermore, the first seal 51 is not joined to the filter 40 or the first frame 20, but remains between the outer peripheral frame OF and the first frame 20. This allows the first seal 51 to rotate relative to both the filter 40 and the first frame 20 in the circumferential direction about the central axis CA.

[0045] The second seal 52 is a spirally wound band-shaped spring. The material of the second seal 52 is the same as that of the first seal 51, that is, stainless steel for springs. The main surface of the second seal 52 faces in a direction perpendicular to the winding axis.

[0046] Although not shown, the second sealant 52 is interposed between the adsorption carrier CS of the filter 40 and the first frame 20. Specifically, the second sealant 52 is located in the space defined by the second recess 25 and the second groove 44. The second sealant 52 is in contact with the outer peripheral surface of the inner peripheral wall 27 of the first frame 20 and the outer peripheral surface of the second protruding wall 46 of the filter 40. The outer peripheral surface of the inner peripheral wall 27 refers to the surface of the outer surface of the inner peripheral wall 27 that faces the first cylindrical body 21. The outer peripheral surface of the second protruding wall 46 refers to the surface of the outer surface of the second protruding wall 46 that faces the outer peripheral side of the filter 40.

[0047] 4, the second seal material 52 is wound around the central axis CA for one or more revolutions. In this embodiment, the second seal material 52 is wound around approximately one revolution. The direction in which the second seal material 52 is wound is the same as the rotation direction of the filter 40. In other words, when the adsorption device 10 is viewed in the negative direction ND, the second seal material 52 is wound counterclockwise from the inner peripheral end to the outer peripheral end.

[0048] The second seal 52 is interposed between the adsorption carrier CS of the filter 40 and the first frame 20 in a state where it is pulled so as to loosen the winding. The "pulled so as to loosen the winding" state refers to a state where the seal is stretched so that its diameter is larger than when no external force is acting on the seal. Therefore, the second seal 52 attempts to reduce its diameter due to its own restoring force. As a result, the outer main surface of the second seal 52 is pressed against the outer peripheral surface of the inner peripheral wall 27 of the first frame 20 and the outer peripheral surface of the second protruding wall 46 of the filter 40.

[0049] Due to this positional relationship, the second sealant 52 closes the gap between the end face of the second cylindrical body 22 facing the filter 40 and the second end face 42 of the adsorption carrier CS from the outer periphery of the opening of the second cylindrical body 22. In other words, air flowing from each flow passage of the first frame 20 to the gap G of the adsorption carrier CS is prevented from flowing toward the center of the second cylindrical body 22. Furthermore, the second sealant 52 is not joined to the filter 40 or the first frame 20, but remains between the filter 40 and the first frame 20. Therefore, the second sealant 52 is rotatable relative to both the filter 40 and the second frame 30 in the circumferential direction about the central axis CA.

[0050] Although not shown, the second frame 30 has a third recess and a fourth recess. The configuration of the third recess is similar to the configuration of the first recess 24 in the first frame 20. That is, the third recess is a depression in the end face of the second frame 30 facing the outer peripheral frame OF. The third recess extends in an annular shape centered on the central axis CA. The third recess faces the first recess 24 in the direction along the central axis CA, with the filter 40 sandwiched between them.

[0051] The configuration of the fourth recess is the same as the configuration of the second recess 25 in the first frame 20. That is, the fourth recess is a depression in the end face of the second frame 30 facing the filter 40. The fourth recess extends in an annular shape centered on the central axis CA. The fourth recess faces the second recess 25 across the filter 40 in the direction along the central axis CA.

[0052] The filter 40 has a third groove and a fourth groove. The third groove is a recess in the end face of the filter 40 facing the second frame 30, i.e., in the second end face 42. The configuration of the third groove is similar to the configuration of the first groove 43 in the first end face 41. The third groove is located in a portion of the second end face 42 of the filter 40 that faces the third recess.

[0053] The fourth groove is a depression in the second end face 42. The fourth groove is located at a location on the second end face 42 of the filter 40 that faces the fourth recess. The configuration of the fourth groove is similar to the configuration of the second groove 44 in the first end face 41. The fourth groove is located at a location on the second end face 42 of the filter 40 that faces the second recess 25.

[0054] The adsorption device 10 includes a third seal and a fourth seal (not shown). The material of the third seal and the fourth seal is the same as that of the first seal 51, that is, spring stainless steel.

[0055] The positional relationship of the third sealant with respect to the filter 40 and the second frame 30 is the same as the positional relationship of the first sealant 51 with respect to the filter 40 and the first frame 20. That is, the third sealant is interposed between the filter 40 and the second frame 30. Specifically, the third sealant is in contact with the inner circumferential surface of the outer circumferential wall of the third recessed portion of the second frame 30 and the inner circumferential surface of the third protruding wall of the filter 40.

[0056] The positional relationship of the fourth sealant with respect to the filter 40 and the second frame 30 is the same as the positional relationship of the second sealant 52 with respect to the filter 40 and the first frame 20. That is, the fourth sealant is interposed between the filter 40 and the second frame 30. Specifically, the fourth sealant is in contact with the outer peripheral surface of the inner peripheral wall of the fourth recessed portion of the second frame 30 and the outer peripheral surface of the fourth protruding wall of the filter 40.

[0057] (Dimensions of the recess and groove) The width of the first groove 43 is 1 / 80 or less of the diameter of the filter 40. The width of the first groove 43 is the shortest distance between the two walls that define the first groove 43 on the same plane as the end face of the filter 40. Specifically, the diameter of the filter 40 is 300 mm or more and 1000 mm or less. The width of the first groove 43 is approximately 1 / 100 of the diameter of the filter 40. In other words, the width of the first groove 43 is 3 mm or more and 10 mm or less.

[0058] The width of the first groove 43 is 3 to 20 times the thickness of the first seal material 51 and the second seal material 52. More preferably, the width of the first groove 43 is 3 to 10 times the thickness of the first seal material 51 and the second seal material 52. Specifically, the thickness of the first seal material 51 and the second seal material 52 is 0.5 mm to 1.0 mm.

[0059] The same configurations regarding these width dimensions also apply to the widths of the second recess 25 to the fourth recess, the widths of the first groove 43 to the fourth groove, and the relationship with the second seal material 52 to the fourth seal material.

[0060] (Effects of the Present Embodiment) The configuration of the above-described embodiment provides the following effects. Note that, although only the effects of the first sealant 51 and the second sealant 52 are described, the third sealant and the fourth sealant interposed between the second end surface 42 of the filter 40 and the second frame 30 also provide similar effects.

[0061] (1) In the above embodiment, the first seal 51 contacts the inner circumferential surface of the first protruding wall 45 and the inner circumferential surface of the outer circumferential wall 26. Here, because gas is blown from the first fan B1 and the second fan B2, the air pressure in the gap between the first frame 20 and the filter 40 becomes slightly higher than the external air pressure. This pressure presses the first seal 51 against each inner circumferential surface. That is, the positive pressure in the gap between the first frame 20 and the filter 40 causes the first seal 51 to close the gap between the first frame 20 and the filter 40. Meanwhile, the main surface of the first seal 51 is aligned with the central axis CA. That is, the extension direction of the main surface of the first seal 51 is aligned with the direction of the gas flowing through the gap between the first frame 20 and the filter 40. Therefore, the wind pressure acting on the first seal 51 is unlikely to be large. As a result, the frictional force between the first seal 51 and the filter 40 is unlikely to be large when the filter 40 rotates.

[0062] (2) In the above embodiment, the filter 40 has the first groove portion 43. The first frame 20 has the first recess portion 24. With these configurations, the first seal material 51 can be attached to the filter 40 or the first frame 20 by fitting it into the recess. In other words, the positioning of the first seal material 51 can be easily performed.

[0063] (3) In the above embodiment, the first seal 51 is rotatable in the circumferential direction about the central axis CA relative to both the filter 40 and the first frame 20. For example, assume that the frictional force between the first seal 51 and the filter 40 is greater than the frictional force between the first seal 51 and the first frame 20. In this case, when the filter 40 rotates, the first seal 51 primarily rotates relative to the first frame 20. Furthermore, if the above-described relationship between the magnitudes of the frictional forces is reversed, when the filter 40 rotates, the first seal 51 primarily rotates relative to the filter 40. In this way, the first seal 51 rotates relative to an object with a smaller frictional force, thereby suppressing wear of the first seal 51.

[0064] (4) In the above embodiment, the first seal 51 is a spiral spring wound one or more times around the central axis CA. The first seal 51 is interposed between the filter 40 and the first frame 20 in a tightly wound elastically compressed state. This causes a restoring force to act on the first seal 51, causing it to return to its original state from the tightly wound state. This makes the first seal 51 more likely to move toward the outer walls of the first recess 24 and the first groove 43. This improves the airtightness between the filter 40 and the first frame 20.

[0065] (5) In the above embodiment, the second seal 52 contacts the outer peripheral surface of the second protruding wall 46 and the outer peripheral surface of the inner peripheral wall 27. As described above, the air pressure in the gap between the first frame 20 and the filter 40 is slightly higher than the external air pressure. This pressure presses the second seal 52 against each outer peripheral surface. That is, the positive pressure in the gap between the first frame 20 and the filter 40 causes the second seal 52 to close the gap between the first frame 20 and the filter 40. Meanwhile, the main surface of the second seal 52 is aligned with the central axis CA. That is, the extension direction of the main surface of the second seal 52 is aligned with the direction of the gas flowing through the gap between the first frame 20 and the filter 40. Therefore, the wind pressure acting on the second seal 52 is unlikely to be large. As a result, the frictional force between the second seal 52 and the filter 40 is unlikely to be large when the filter 40 rotates.

[0066] (6) In the above embodiment, the second seal 52 is a spiral spring wound one or more times around the central axis CA. The second seal 52 is interposed between the filter 40 and the first frame 20 in a tensioned state so that the winding is loose. This causes a restoring force to act on the second seal 52, which tends to return it to its original state from the loosely wound state. This makes the second seal 52 more likely to move toward the inner circumferential wall 27 and the second protruding wall 46. This improves the airtightness between the filter 40 and the second frame 30.

[0067] <Modifications> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0068] The type of adsorbent supported by the adsorption carrier CS is not limited to that described in the above embodiment. That is, the adsorbed substance is not limited to an organic solvent. For example, the type of adsorbent may be changed in order to use the filter 40 as a deodorizing filter.

[0069] The structure of the adsorption carrier CS is not limited to the example described in the above embodiment. For example, the adsorption carrier CS may be a carrier made of a porous material such as a sponge. However, at least some of the pores of the adsorption carrier CS must be continuous pores extending from the first end surface 41 to the second end surface 42 of the adsorption carrier CS.

[0070] The dimensions of the filter 40 are not limited to those of the above embodiment. They may be changed as appropriate depending on the application and type of the filter 40. The first frame 20 does not need to have multiple through holes and partition walls 23. For example, even if the first frame 20 consists of only the first cylindrical body 21, it is sufficient that the first cylindrical body 21 has a circular opening edge OP.

[0071] The first frame 20 does not have to have the first recess 24 to the fourth recess. It is sufficient that the first frame 20 has at least an annular outer peripheral wall 26 centered on the central axis CA on the outer side of the opening edge OP. For example, the first cylindrical body 21 may be cylindrical and not have the first recess 24. In this case, the first cylindrical body 21 itself is the outer peripheral wall 26. Even in this case, the first frame 20 has an annular outer peripheral wall 26 centered on the central axis CA on the outer side of the opening edge OP. In other words, the first seal material 51 contacts the inner peripheral surface of the first cylindrical body 21.

[0072] The filter 40 does not have to include the outer frame OF. For example, the filter 40 may include only the adsorbent carrier CS, and the adsorbent carrier CS may have the first groove portion 43. That is, the adsorbent carrier CS may have an annular first protruding wall 45 at a position facing the outer wall 26.

[0073] The first seal 51 may be bonded to either the filter 40 or the first frame 20. It is sufficient that the first seal 51 contacts at least the inner circumferential surface of the outer circumferential wall 26 and the inner circumferential surface of the first protruding wall 45, and that the filter 40 is rotatable. This also applies to the second to fourth seals 52 to 54.

[0074] The first seal 51 does not have to be a spiral spring wound one or more times around the central axis CA. The first seal 51 may be wound less than one time around the central axis CA, and another seal may be provided between the ends of the first seal 51.

[0075] The first sealant 51 does not have to be elastically compressed so as to be tightly wound. As long as the first sealant 51 is in contact with at least the inner circumferential surface of the outer wall 26 and the inner circumferential surface of the first protruding wall 45, air can be prevented from leaking from the adsorption device 10 in those areas. The same applies to the third sealant.

[0076] The second sealant 52 does not have to be in a tensioned state so that the winding is loose. As long as the second sealant 52 is in contact with at least the outer circumferential surface of the inner circumferential wall 27 and the outer circumferential surface of the second protruding wall 46, air can be prevented from leaking into the interior of the second cylindrical body 22 at those portions. The same applies to the fourth sealant.

[0077] The adsorption device 10 does not need to have the second sealing material 52. For example, if the second cylindrical body 22 is not cylindrical but is columnar with no internal cavity, air will not leak into the interior of the second cylindrical body 22.

[0078] The material of the first seal 51 is not limited to the example in the above embodiment. For example, it may be a copper alloy material such as first brass, phosphor bronze, nickel silver, or beryllium copper. The same applies to the second to fourth seals 52 to 54.

[0079] The adsorption device 10 may have five or more sealants. For example, the adsorption device 10 may have a fifth sealant that overlaps the first sealant 51 on the central axis CA side. This increases the biasing force of the sealant toward the outer periphery, making it easier to prevent air from leaking out of the adsorption device 10.

[0080] The adsorption device 10 may include a spring member 60 that biases the first seal 51 in a direction that loosens the winding. In the example shown in FIG. 7 , the spring member 60 is connected to the first seal 51 at two locations on either side of the outer peripheral end of the first seal 51. The spring member 60 is elastically compressed when the first seal 51 is attached to the filter 40 or the like. Therefore, the restoring force of the spring member 60 biases the first seal 51 in a direction that loosens the winding, i.e., in a direction that increases the diameter. This allows the biasing force to be adjusted by the elastic modulus of the spring member 60 and the attachment position of the first seal 51. In other words, the presence of the spring member 60 can adjust the frictional force generated in the first seal 51 and the sealing ability of the gap between the first frame 20 and the filter 40. The same applies to the third seal.

[0081] In the above embodiment, the recovery device 110 is treated as a separate component from the drying furnace 100, but the recovery device 110 may be included in the drying furnace 100. The connection relationship between the adsorption device 10 and each flow path can be changed as appropriate. As long as the gas containing the organic solvent exhausted from the drying chamber R is supplied to the adsorption device 10, the number of flow paths, the connection relationship, and other configurations are not important.

[0082] <Supplementary Notes> The technical ideas that can be understood from the above-described embodiments and modified examples will be described below. [1] An adsorption device comprising: a columnar filter having an adsorption carrier that carries an adsorbent capable of adsorbing a specific substance and that is rotatable about a central axis; a frame having a circular opening edge that is centered on the central axis of the filter; and a sealant interposed between the filter and the frame, wherein the frame has an annular outer peripheral wall that is centered on the central axis and that is located outward from the opening edge, the filter has an annular protruding wall that is located opposite the outer peripheral wall in a direction along the central axis, and the sealant is in contact with the inner peripheral surface of the outer peripheral wall and the inner peripheral surface of the protruding wall.

[0083] [2] The adsorption device described in [1], wherein the filter has a groove portion that is recessed in the end face facing the frame and extends in a circular shape centered on the central axis, and the protruding wall is one of the walls that define the groove portion and is located on the outside of the groove portion.

[0084] [3] The adsorption device according to [1] or [2], wherein the frame has a recess that is recessed on the end face facing the filter and extends in a circular ring shape centered on the central axis, and the outer peripheral wall is one of the walls that define the recess and is located outside the recess.

[0085] [4] The adsorption device according to any one of [1] to [3], wherein the sealing material is rotatable relative to both the filter and the frame in a circumferential direction about the central axis.

[0086] [5] An adsorption device described in any one of [1] to [4], wherein the sealing material is a spiral spring wound around the central axis line for one or more revolutions, and is interposed between the filter and the frame in a state in which it is elastically compressed so as to be tightly wound.

[0087] [6] The suction device according to [5], further comprising a spring member that biases the sealing material in a direction that loosens the winding. [7] The suction device according to any one of [1] to [6], further comprising a second sealing material interposed between the filter and the frame when the sealing material is a first sealing material and the protruding wall is a first protruding wall, the frame has a cylindrical inner circumferential wall centered on the central axis of the filter on the inside of the opening edge, the filter has an annular second protruding wall at a position facing the inner circumferential wall in a direction along the central axis, and the second sealing material is in contact with an outer circumferential surface of the inner circumferential wall and an outer circumferential surface of the second protruding wall.

[0088] [8] The adsorption device described in [7], wherein the second sealing material is a spiral spring wound around the central axis line for one or more revolutions, and is interposed between the filter and the frame in a tensioned state so that the winding is loose.

[0089] DESCRIPTION OF SYMBOLS 10...Adsorption device CA...Central axis PD...Positive direction ND...Negative direction 20...First frame 21...First cylindrical body 24...First recess 26...Outer peripheral wall 22...Second cylindrical body 25...Second recess 27...Inner peripheral wall 30...Second frame 40...Filter CS...Adsorption carrier OF...Outer peripheral frame 41...First end surface 43...First groove portion 45...First protruding wall 44...Second groove portion 46...Second protruding wall 42...Second end surface 51...First seal material 52...Second seal material 60...Spring member

Claims

1. An adsorption device comprising: a columnar filter having an adsorption carrier that carries an adsorbent capable of adsorbing a specific substance and that is rotatable around a central axis; a frame having a circular opening edge that is centered on the central axis of the filter; and a sealant interposed between the filter and the frame, wherein the frame has an annular outer wall that is centered on the central axis and is located outward from the opening edge; the filter has an annular protruding wall that is located opposite the outer peripheral wall in a direction along the central axis; and the sealant is in contact with the inner peripheral surface of the outer peripheral wall and the inner peripheral surface of the protruding wall.

2. The adsorption device according to claim 1, wherein the filter has a groove recessed in the end face facing the frame and extending in an annular shape centered on the central axis, and the protruding wall is one of the walls defining the groove that is located on the outside of the groove.

3. An adsorption device according to claim 1 or claim 2, wherein the frame has a recess that is recessed on the end face facing the filter and extends in an annular shape centered on the central axis, and the outer peripheral wall is one of the walls that define the recess and is located outside the recess.

4. An adsorption device according to any one of claims 1 to 3, wherein the sealing material is rotatable relative to both the filter and the frame in the circumferential direction about the central axis.

5. An adsorption device as claimed in any one of claims 1 to 4, wherein the sealing material is a spiral spring wound around the central axis line for one or more revolutions, and is interposed between the filter and the frame in a state where it is elastically compressed so that the winding is tight.

6. The suction device according to claim 5, further comprising a spring member that biases the sealing material in a direction that loosens the winding.

7. An adsorption device as claimed in any one of claims 1 to 6, further comprising a second sealing material interposed between the filter and the frame when the sealing material is a first sealing material and the protruding wall is a first protruding wall, the frame having a cylindrical inner peripheral wall centered on the central axis of the filter on the inside of the opening edge, the filter having an annular second protruding wall at a position facing the inner peripheral wall in a direction along the central axis, and the second sealing material being in contact with the outer peripheral surface of the inner peripheral wall and the outer peripheral surface of the second protruding wall.

8. The adsorption device described in claim 7, wherein the second sealing material is a spiral spring wound around the central axis line for one or more revolutions, and is interposed between the filter and the frame in a tensioned state so that the winding is loose.

9. A drying furnace comprising: an adsorption device according to any one of claims 1 to 8; a drying chamber; and a duct connected to the frame of the adsorption device and through which gas exhausted from the drying chamber flows.

Images