Mist collection filter and mist collection device

Abstract

The present invention reduces dripping of oil, moisture, and the like from a resistance plate.　Provided is a mist collection filter, said mist collection filter comprising: a rotating filter 31a that has a hole 31a1 through which gas passes; and a resistance plate 31b which is provided on the reverse side from the intake-side surface of the rotating filter 31a, and which creates resistance for the gas passing through the hole 31a1, wherein the rotating filter 31a and the resistance plate 31b are attached to a driving rotation shaft and rotate.

Description

Mist collection filter and mist collection device

[0001] The present invention relates to a mist collection filter for removing oil from oil fumes and the like, and a mist collection device provided with this mist collection filter.

[0002] Conventionally, this type of invention includes a rotary filter having holes, and an air flow stop member fixed to the downstream side of the rotary filter to provide air flow resistance, and a motor for driving the rotary filter to rotate is supported on the air flow stop member. There is a range hood (see, for example, Patent Document 1). According to this range hood, the air flow resistance of the air passing through the holes on the rotation center side of the rotary filter is increased by the air flow stop member, the flow velocity of the air passing through the holes is decreased, and the noise during operation is suppressed. And other effects are achieved.

[0003] Japanese Patent Application Laid-Open No. 2021-120599

[0004] However, according to the above prior art, the oil adhering to the air flow stop member that cannot be completely removed by the rotating filter may drip, which may cause oil leakage and the like.

[0005] In view of such problems, one aspect of the present invention has the following configuration. It includes a rotary filter having holes for passing gas, and a resistance plate provided on the side opposite to the suction side surface of the rotary filter to provide resistance to the gas passing through the holes. The rotary filter and the resistance plate are mounted on a drive rotation shaft and configured to rotate. A mist collection filter characterized by being.

[0006] Since the present invention is configured as described above, it is possible to reduce dripping of oil, moisture, etc. from the resistance plate.

[0007] This is a side view showing an example of a mist collection filter according to the present invention. This is a top view of the same mist collection filter. This is a bottom view of the same mist collection filter, showing the main parts in detail. This is an exploded perspective view of the same mist collection filter. This is a perspective view of an example of a mist collection device equipped with the same mist collection filter, viewed from the upper right. This is a perspective view of the same mist collection device, viewed from the lower right. This is a perspective view of the same mist collection device, with the upper half of the housing etc. cut out to show the internal structure. This is a perspective view of the same mist collection device, with the upper half of the entire device cut out to show the gas flow path. This is a longitudinal cross-sectional view of the main part of the mist collection device, with the front half cut out to show the internal structure. This is a longitudinal cross-sectional perspective view of the main part showing the mist collection filter and oil receiver etc. in detail in detail. This is a longitudinal cross-sectional view of the main part showing the mist collection filter and oil receiver etc. in detail, with the oil discharge path indicated by a dashed line. This is a perspective view of the mist collection device from the lower right, showing the state with the rectifier plate removed. This is a perspective view of the mist collection device from the lower right, showing the state with the components from the rectifier plate to the mist collection filter removed. This is a side view showing another example of the mist collection filter according to the present invention, with the main part cut out to show a cross-section. This is a side view showing another example of the mist collection filter according to the present invention, with the main part cut out to show a cross-section. This is an enlarged side view of the main part showing another example of the mist collection filter according to the present invention, with the resistance plate partially cut out to show a cross-section. This is a side view showing another example of the mist collection filter according to the present invention.

[0008] Next, embodiments of the present invention will be described in detail with reference to the drawings. <About the mist collection filter> Figures 1 to 4 show an example of a mist collection filter according to the present invention. This mist collection filter 31 comprises a rotating filter 31a having holes 31a1 through which gas passes, a resistance plate 31b provided on the side of the rotating filter 31a opposite to the suction side and acting as resistance to the gas passing through the holes 31a1, and a connecting hub 31c and a connecting sleeve 31d that connect the rotating filter 31a and the resistance plate 31b at the center, and is configured as a disassemblable, integrated unit. This mist collection filter 31 is mounted on the drive rotating shaft 33a of the mist collection device 1, which will be described later, so that both the rotating filter 31a and the resistance plate 31b rotate simultaneously as a single unit.

[0009] The rotating filter 31a is configured as a roughly circular plate. This rotating filter 31a is provided with numerous holes 31a1 extending from the periphery towards the center.

[0010] Each hole 31a1 is an elongated hole that inclins in the direction of rotation (clockwise in Figure 3) toward the center of the rotating filter 31a. Multiple holes 31a1 are provided at predetermined intervals in the circumferential direction of the rotating filter 31a, and furthermore, multiple layers (four layers in the illustrated example) are provided at predetermined intervals in the radial direction of the rotating filter 31a. As the rotating filter 31a rotates, each hole 31a1 moves at high speed in the circumferential direction of the rotating filter 31a, causing oil, moisture, etc. contained in the gas attempting to pass through each hole 31a1 to come into contact with the inner edge of the hole 31a1 and be blown away.

[0011] The resistance plate 31b is formed in a circular, flat shape and is provided with a substantially constant gap s between it and the side of the rotating filter 31a opposite to the suction side (the top surface in the illustrated example). On this resistance plate 31b, the side facing the rotating filter 31a (the bottom surface in the illustrated example) is a smooth, substantially flat surface substantially parallel to the surface of the rotating filter 31a, and the opposite side is a similar surface. With this configuration, the air that has passed through the hole 31a1 on the rotation center side of the rotating filter 31a can easily pass smoothly through the gap s between the rotating filter 31a and the resistance plate 31b. Furthermore, the oil adhering to the resistance plate 31b can be easily ejected smoothly in the centrifugal direction.

[0012] The resistance plate 31b is provided so as to be close to the holes 31a1 located closer to the center of the rotating filter 31a, among the numerous holes 31a1. That is, the numerous holes 31a1 have through-holes 31a11 that do not face the resistance plate 31b, and also have through-holes 31a12 that face the resistance plate 31b, located closer to the center of the rotating filter than these through-holes 31a11. In other words, as shown in Figure 1, the length L1 (radial length) of the perpendicular from the outer peripheral end of the resistance plate 31b to the drive rotating shaft 33a, described later, is shorter than the length L2 of the perpendicular from the outermost part of the hole 31a1 located closest to the outermost edge of the rotating filter 31a to the drive rotating shaft 33a, and longer than the length L3 of the perpendicular from the innermost part of the hole 31a1 located closest to the central axis of the rotating filter 31a to the drive rotating shaft 33a. With this configuration, it is possible to suppress an excessive increase in the airflow resistance of the mist collection filter 31.

[0013] As shown in the illustrated example, of the two types of through-holes, one of the through-holes 31a11 is composed of multiple holes 31a1 arranged in a single layer, closest to the outer diameter of the rotating filter, out of a total of four layers of holes 31a1. This through-hole 31a11 is located radially outward from the outer circumference of the resistance plate 31b (see Figure 2). In other words, most of the gas passing through the through-hole 31a11 flows radially outward from the resistance plate 31b.

[0014] The other through-section 31a12 is composed of multiple holes 31a1 arranged in a three-layer configuration near the center of the rotating filter. A resistance plate 31b is provided facing this through-section 31a12, with a gap s between it and the side of the rotating filter 31a opposite to the suction side. The gap s is a constant dimension throughout the radial and circumferential directions of the resistance plate 31b, although it may vary slightly due to design tolerances of each component and manufacturing errors. With this configuration, the gas passing through the through-section 31a12 hits the resistance plate 31b, reducing its flow velocity. This makes it possible to equalize the airflow resistance as the gas that has passed through the through-section 31a12 passes through the gap s.

[0015] The connecting hub 31c penetrates the center of the rotating filter 31a and the resistance plate 31b from below, and its upper end is connected to the drive rotating shaft 33a. This connecting hub 31c is a stepped cylindrical member with an enlarged lower end (see Figure 4), and the rotating filter 31a and the resistance plate 31b are mounted in an annular manner above the enlarged portion.

[0016] The connecting sleeve 31d is fitted into the upper part of the connecting hub 31c in a crown-like manner, sandwiching the rotating filter 31a and the resistance plate 31b between itself and the enlarged diameter portion of the lower part of the connecting hub 31c, and is detachably locked in place.

[0017] The mist collection filter 31, which is integrated in this manner, is detachably locked by fitting the upper end of the connecting hub 31c in an annular manner onto the drive rotating shaft of the mist collection device 1, which will be described later.

[0018] In the figure, reference numeral 31c1 indicates an operating part that is pressed when the mist collection filter 31 is removed from the drive rotating shaft 33a. Also, reference numeral 31d1 indicates an operating part that is operated when the connecting sleeve 31d is removed from the connecting hub 31c in order to disassemble the mist collection filter 31.

[0019] <Effects of the Mist Collection Filter> Therefore, with the mist collection filter 31 configured above, the resistance plate 31b acts as resistance to the gas passing through the through-hole 31a12 of the hole 31a1 near the center of the rotating filter 31a. In other words, generally, the flow velocity of gas flowing in a flow path formed by surrounding it with walls is greater near the center of the flow path than near the peripheral wall of the flow path. For this reason, if a rotating filter 31a without a resistance plate 31b were installed in the flow path, a large amount of gas would flow near the center of the rotating filter 31a where the peripheral velocity is low, reducing the collection efficiency. However, with the mist collection filter 31 of this embodiment, the resistance plate 31b acts as resistance to the gas flowing near the center of the rotating filter 31a, increasing the flow rate of gas flowing near the outer diameter of the rotating filter 31a. For this reason, oil, water, etc. contained in the gas can be efficiently captured by the outer diameter portion of the rotating filter 31a where the peripheral velocity is relatively high.

[0020] Furthermore, with the mist collection filter 31 of this embodiment, since the resistance plate 31b rotates integrally with the rotating filter 31a, not only can the oil and water captured by the rotating filter 31a be blown away in the centrifugal direction, but oil and moisture that are not captured by the rotating filter 31a and adhere to the resistance plate 31b can also be blown away in the centrifugal direction, thereby preventing oil and water from falling out of the mist collection filter 31.

[0021] Furthermore, the resistance plate 31b reduces the airflow velocity, thereby reducing noise and vibration caused by airflow. In addition, the mist collection filter 31 can be disassembled, making cleaning and maintenance easier.

[0022] <About the mist collection device> Next, the mist collection device 1 equipped with the mist collection filter 31 with the above configuration will be described in detail.

[0023] The mist collection device 1 is a circulating type range hood that sucks up oil fumes generated by cooking appliances, purifies them, and returns them to the room. It is installed in the room above cooking appliances such as stoves, suspended from the ceiling by suspension bolts or the like.

[0024] This mist collection device 1 comprises a housing 10 having a gas flow path A between a downward-facing intake port 21a and an outlet port a21 oriented substantially perpendicular to the intake port 21a, and a mist collection filter 31 with the above configuration is provided inside this housing 10.

[0025] The gas flow path A has a first flow path a1 that extends upward from the intake port 21a and passes through the mist collection filter 31 within the housing 10, and a second flow path a2 that extends in a substantially horizontal direction from the downstream side (upper side) of the first flow path a1, forming a continuous flow path (see Figure 8).

[0026] A mist collection filter 31 of the grease collection unit 30 is provided in the first flow path a1. Below the mist collection filter 31, an oil receiver 21, an oil recovery section 22, a flow straightening plate 23, and the like are provided.

[0027] The second flow path a2 is equipped with a damper device 34 for the grease collection unit 30, a blower unit 40 that forcibly transports the gas that has passed through the damper device 34 to the outlet a21, a filter unit 50, and the like.

[0028] The second flow path a2 is a flow path that sequentially passes through the damper device 34, the blower 41, and the filter unit casing 51 of the filter unit 50, and is formed to bypass to one side in the width direction of the mist collection device 1 (in the example shown in Figure 8, the left side when viewing the mist collection device 1 from the front) and head toward the front outlet a21 (see Figure 8). Here, the "front side" is the side that is designed to be in the same direction as the front side of cooking equipment, etc., which is located below the mist collection device 1.

[0029] The housing 10 comprises a substantially horizontal plate-shaped partition 11 having an opening 11a (see Figure 13) on the central side, a rectangular frame-shaped hood 12 below the partition 11 with a hood opening 12a facing downward, and left and right side panels 13, 14, left and right front panels 15, 16, a front cover 17, and an upper frame 18 that surround the space above the partition 11 in a substantially concave frame shape in plan view.

[0030] The partition 11 is constructed in the shape of a roughly rectangular plate, and has a rectangular opening 11a (see Figure 13) that penetrates vertically through its approximate center. In the illustrated example, the partition 11 is formed from two metal plates with a gap between them vertically, and a structural material sandwiched between these metal plates, to have a predetermined thickness.

[0031] A roughly rectangular plate-shaped oil receiver 21 is detachably fitted into the opening 11a of the partition 11 via a frame material or the like.

[0032] The oil receiver 21 is formed to receive oil, moisture, etc. below the suction port 21a and is detachably attached to the partition portion 11 of the housing 10. More specifically, as shown in Figures 10 to 11, the oil receiver 21 comprises an inner wall portion 21b surrounding the periphery of the rotating filter 31a and the resistance plate 31b, an extended portion 21d extending inward from the lower end of the inner wall portion 21b, and a protruding piece portion 21a1 projecting toward the rotating filter 31a from the inner edge end of the extended portion 21d, and is formed in a substantially rectangular plate shape in plan view.

[0033] The inner wall portion 21b protrudes upward from all four sides of the oil receiver 21, enclosing the rectangular bottom surface of the oil receiver 21 in a rectangular cylindrical shape. The upper end of this inner wall portion 21b is positioned higher than at least the outer circumference of the resistance plate 31b (see Figure 11).

[0034] The extended portion 21d is formed as a flat plate that extends from the lower end of the inner wall portion 21b toward the center of the rotating filter 31a, and continues to the inner edge end which is circular in shape when viewed from above. The protruding portion 21a1 rises from the inner edge end and forms the suction port 21a.

[0035] The intake port 21a is a circular opening located approximately in the center of the bottom surface of the oil receiver 21, drawing gas in from below. It is formed in a bell-mouth shape with its entire circumference protruding upward. The inner diameter of this intake port 21a is smaller than the outer diameter of the rotating filter 31a and larger than the outer diameter of the resistance plate 31b. In other words, if the intake port 21a is larger than the rotating filter 31a, there is a possibility that gas containing oil mist will pass through without colliding with the rotating filter 31a. Also, if the intake port 21a is smaller than the resistance plate 31b, there is a problem of increased airflow resistance. In a preferred example of this embodiment, the inner diameter of the intake port 21a is set to an appropriate dimension as described above in order to prevent such problems.

[0036] The oil accumulated in the oil receiver 21 with the above configuration flows out through an oil drain hole 21c formed near one side at the lower end of the inner wall portion 21b, is collected by the oil recovery section 22 below, and is discharged to the outside of the mist collection device 1 through the oil discharge pipe 22a of the oil recovery section 22.

[0037] Furthermore, a rectifier plate 23 is provided at intervals directly below the opening 11a of the partition 11. This rectifier plate 23 is formed in the shape of a rectangular plate that covers the opening 11a and is detachably attached to the lower surface of the partition 11 via a bracket or a locking / detaching member.

[0038] The hood 12 is a substantially cylindrical member that protrudes downward along the periphery of the partition portion 11. In the illustrated example, the hood 12 is formed from a plurality of sheet metal members into a relatively short rectangular tube shape in the vertical direction, and has a hood opening 12a at its lower end for drawing in outside air from below.

[0039] The gas that is sucked into the hood opening 12a and rises passes through the gap between the flow rectifying plate 23 and the partition portion 11, and further passes through the suction port 21a at the center of the oil receiver 21 and through the holes 31a1 of the rotary filter 31a.

[0040] The upper side of the partition portion 11 is surrounded by a substantially box shape that is open upward and rearward by the left and right horizontal curtain plates 13, 14, the left and right front curtain plates 15, 16, the front lid 17, and the upper frame 18, etc.

[0041] The grease collection unit 30 includes, in the middle of the first flow path a1 that goes upward, a mist collection filter 31 that collects oil, moisture, dust, dirt, etc. from the gas, a motor 33 that drives and rotates the mist collection filter 31 on the upper side of the mist collection filter 31, a damper device 34 that opens and closes the second flow path a2 that goes horizontally from the space above the mist collection filter 31, and a grease collection unit casing 35 that covers the space above the mist collection filter 31 and the damper device 34, and is configured in an integrated unit shape.

[0042] The mist collection filter 31 has the above-described configuration, and is detachably attached to the drive rotation shaft 33a of the motor 33 with the rotary filter 31a facing downward and the resistance plate 31b facing upward.

[0043] Also, in FIGS. 10 and 11, reference numeral 36 is a cover plate that prevents oil, moisture, etc. that have flown in the centrifugal direction from hitting the inner wall portion 21b and scattering. This cover plate 36 also functions as a member that regulates the height position of the oil receiver 21 so that the oil receiver 21 does not contact the rotary filter 31a. According to the illustrated example, this cover plate 36 is fixed to the inner surface of the grease collection unit casing 35, but it may be configured to be fixed to the upper end side of the inner wall portion 21b.

[0044] The motor 33 is an AC or DC electric motor, and includes a drive rotation shaft 33a that extends in the vertical direction and a motor body 33b that drives and rotates this drive rotation shaft 33a on the upper end side of the peripheral wall of the gas flow path A.

[0045] The drive rotating shaft 33a penetrates through a lowered portion 35a of the upper wall in the grease collection unit casing 35 on the upstream side of a blower 41 described later. The gap formed by this penetration is blocked by a shield type bearing 37 annularly mounted on the drive rotating shaft 33a within the grease collection unit casing 35, a sealing material, and the like.

[0046] The motor body 33b is connected to the upper surface of the grease collection unit casing 35 via a motor bracket 33c.

[0047] The damper device 34 is a fire damper that prevents flames and smoke from flowing through the gas flow path A in the event of a fire. This damper device 34 includes a damper main body portion 34a that opens and closes a partition plate, and a temperature sensor 34b. When the detected temperature of the temperature sensor 34b exceeds a predetermined value, it is controlled to close the partition plate of the damper main body portion 34a.

[0048] The damper main body portion 34a is located closer to the upstream side of the second flow path a2 so as to open and close the second flow path a2, and is fixedly secured to the housing 10 via the grease collection unit casing 35 and the like.

[0049] The temperature sensor 34b is provided closer to the damper device 34 in a space where the suction port 21a extends vertically upward. More specifically, this temperature sensor 34b is located substantially directly above a hole 31a1 near the outer diameter that is not covered by the resistance plate 31b in the rotary filter 31a, and is fixed near the suction port 21a in the damper main body portion 34a (see FIG. 9). According to this configuration, since the temperature sensor 34b is located near the outer diameter of the rotary filter 31a where the gas flow rate is the highest, the temperature of the overheated gas can be well detected by the temperature sensor 34b. Moreover, according to the above configuration, since the temperature sensor 34b is located in a space where the suction port 21a extends vertically upward on the outer contour of the damper main body portion 34a, it is possible to reach out and access the temperature sensor 34b from the suction port 21a, and it has excellent maintainability.

[0050] The grease collection unit casing 35 forms a roughly box-shaped gas flow path A with openings on the upstream side (downward side) and the downstream side (lateral side), and covers the space above the mist collection filter 31 and the damper device 34, etc., and is fixed to the upper surface of the partition 11.

[0051] The blower unit 40 integrally comprises a blower 41 (for example, a sirocco fan, etc.) that forcibly transports the gas that has passed through the damper device 34 and guides it to the purification filter 52, and a blower unit casing 42 that covers the blower 41. The blower unit 40 has the intake port of the blower 41 communicating with the outlet of the damper device 34, and the air outlet of the blower 41 is detachably attached to the upper surface of the partition portion 11 of the housing 10, with the outlet of the blower 41 facing the filter unit 50.

[0052] The filter unit 50 integrally comprises a filter unit casing 51 located in front of (closer to the front of) the grease collection unit 30 and the blower unit 40, and a plurality of purifying filters 52 detachably mounted inside the filter unit casing 51, and is detachably mounted to the housing 10. This filter unit 50 is configured to pass the gas supplied from the blower unit 40 through the plurality of purifying filters 52 and guide it to the outlet a21. The outlet a21 is provided with a louver that changes the direction of airflow.

[0053] Therefore, with the mist collection device 1 configured as described above, in addition to blowing oil and water captured by the rotating filter 31a in the centrifugal direction, oil and moisture that are not captured by the rotating filter 31a and adhere to the resistance plate 31b can also be blown in the centrifugal direction. The blown oil and water then hits the inner wall portion 21b of the oil receiver 21 and flows downward, and further flows through the oil drain hole 21c to the oil recovery unit 22, where it can be discharged to the outside from the oil discharge pipe 22a (see Figure 11). Thus, it is possible to prevent oil adhering to the rotating filter 31a and resistance plate 31b from dripping and causing oil leaks.

[0054] <Another Example of Mist Collection Filter 1> Next, another example of the mist collection filter according to the present invention will be described. The mist collection filter described below is a modified version of the mist collection filter 31 described above, so the modified parts will be described in detail, and parts that function in the same way as the mist collection filter 31 will be given the same reference numerals and their detailed description will be omitted.

[0055] The mist collection filter 31X1 shown in Figure 14 is configured such that the gap between the resistance plate 31e and the rotating filter 31a gradually increases radially outward, by replacing the resistance plate 31b with a resistance plate 31e in the mist collection filter 31 described above.

[0056] The resistance plate 31e is integrally composed of a circular flat plate portion 31e1 and an annular inclined plate portion 31e2 extending radially outward from the flat plate portion 31e1.

[0057] The flat plate portion 31e1 is formed in a disc shape substantially parallel to the rotating filter 31a, and, similarly to the resistance plate 31b, is integrally configured with the rotating filter 31a by connecting hubs 31c and 31c.

[0058] The inclined plate portion 31e2 has an inclined longitudinal cross-section that moves away from the rotating filter 31a as it extends radially outward, and it is continuous in an endless annular shape around its entire circumference.

[0059] In other words, the gap s' between the inclined plate portion 31e2 and the rotating filter 31a gradually increases as it moves radially outward. When comparing the total radial length of this gap s' (from the outer peripheral end of the connecting hub 31c to the outer peripheral end of the resistance plate 31e, as shown in Figure 14), the average size of the gap on the outer peripheral side is larger than the average size of the gap on the rotation center side.

[0060] The mist collection filter 31X1 with the above configuration can be attached to the drive rotating shaft 33a of the mist collection device 1, similar to the mist collection filter 31 described earlier.

[0061] Therefore, with the mist collection filter 31X1 shown in Figure 14, similar to the mist collection filter 31 described above, oil mist can be efficiently captured by directing more of it towards the outer diameter of the rotating filter 31a than towards the center, and the oil adhering to the resistance plate 31e can be recovered by being blown centrifugally by the rotation of the resistance plate 31e.

[0062] Furthermore, the gas that passes through the holes 31a1 on the central side of the rotating filter 31a hits the resistance plate 31e and then passes through the gradually widening gap s', thereby slowing down the flow velocity. As a result, the wind noise associated with the rotation of the mist collection filter 31X1 can be reduced, and for example, when this mist collection filter 31X1 is incorporated into the mist collection device 1, the flow velocity of the gas blown out from the outlet a21 can be suppressed, further reducing the impact on objects and people near the outlet a21.

[0063] Furthermore, with the mist collection filter 31X1 configured as described above, the change in the radial suction amount of the rotating filter 31a can be made more gradual compared to the case where the gap s is uniform in the radial direction. That is, for example, as in the mist collection filter 31 of Figure 1, when the gap s is uniform in the radial direction, the suction amount changes abruptly between the through-hole portion 31a12 where the downstream side faces the resistance plate 31b and the through-hole portion 31a11 where the downstream side faces the space without the resistance plate 31b. In contrast, in the mist collection filter 31X1 of Figure 14, the airflow resistance gradually decreases as you move radially outward in the through-hole portion 31a12 where the downstream side faces the resistance plate 31b. For this reason, the change in the radial suction amount of the rotating filter 31a is more gradual in the mist collection filter 31X1 compared to the mist collection filter 31. Consequently, oil can be efficiently collected throughout the entire radial direction of the rotating filter 31a.

[0064] In the illustrated example of the mist collection filter 31X1, the gap s' between the rotating filter 31a and the resistance plate 31e (specifically the inclined plate portion 31e2) is made to increase continuously toward the radially outward direction. However, in other examples, the resistance plate may be formed in a stepped shape in its vertical cross-section so that the gap s' increases in stages. Furthermore, in other examples besides the illustrated example, the surface of the inclined plate portion 31e2 facing the rotating filter 31a may be formed in a convex or concave curved shape so that the gap s' increases curvilinearly.

[0065] Furthermore, in the illustrated example of the mist collection filter 31X1, as a preferred example, the gap s' is made to increase radially outward along its entire radial length. However, other examples of the gap s' include a configuration in which it increases radially outward but partially decreases at its radial ends or in the middle. For example, the outer peripheral end of the inclined plate portion 31e2 may be bent toward the rotating filter 31a side, so that the gap ' becomes partially smaller. In this configuration, where the gap s' increases radially outward in a portion, at least in that portion, the flow velocity of the gas passing through the gap s' that increases radially outward can be suppressed, similar to the mist collection filter 31X1 described above. Consequently, as mentioned above, it becomes possible to reduce wind noise and mitigate the impact on objects and people on the discharge side.

[0066] <Another example of a mist collection filter 2> The mist collection filter 31X2 shown in Figure 15 is the same as the mist collection filter 31 with the above configuration, but with the resistance plate 31b replaced by a resistance plate 31f.

[0067] The resistor plate 31f is a resistor plate body 31f1 having substantially the same configuration as the resistor plate 31b, with a protrusion 31f2 provided on it.

[0068] Multiple protrusions 31f2 (three in the illustrated example) are provided on the surface of the resistor plate body 31f1 facing the rotary filter 31a, spaced radially apart. Each protrusion 31f2 is formed in an endless annular shape that extends around the entire circumference. The resistor plate 31f may be in one configuration, as shown in the example in Figure 15, in which protrusions 31f2 are added to a flat resistor plate body 31f1, or in one configuration, in which a portion of the flat resistor plate body 31f1 is extruded and deformed by press working or the like to form the protrusions 31f2.

[0069] Therefore, the mist collection filter 31X2 shown in Figure 15 provides substantially the same effects as the mist collection filter 31 described above, in addition to the following effects. Specifically, the gas that passes through the holes 31a1 near the center of the resistance plate 31f and moves radially outward is disturbed by the protrusions 31f2, and its flow rate decreases. As a result, the gas flow rate increases relatively near the outer diameter of the rotating filter 31a, improving the oil collection efficiency. Furthermore, because some of the gas whose flow is disturbed by the protrusions 31f2 remains in the gap s, the opportunity for this remaining gas to come into contact with the holes 31a1 of the rotating filter 31a increases. Therefore, the oil collection efficiency of the rotating filter 31a, especially near the center, is improved.

[0070] Furthermore, if the rotating resistance plate is a relatively thin flat plate, the turbulence and swirling airflow caused by the rotating filter 31a, as well as the rotation of the resistance plate itself, may cause deformation, wobble, vibration, etc. However, with the mist collection filter 31X2, by providing a continuous convex portion 31f2 in the circumferential direction, or a continuous convex portion (not shown) in the radial direction, the rigidity of the resistance plate is increased, preventing the aforementioned problems, and also enabling cost reduction by making the plate thickness thinner.

[0071] In the above embodiment, multiple endless annular protrusions 31f2 are provided. However, other examples include a configuration with a single protrusion 31f2, a configuration in which each protrusion 31f2 is a circular arc-shaped projection separated in the circumferential direction, or a configuration in which each protrusion 31f2 is a simple projection that is not continuous in the circumferential direction. Furthermore, in another example, the protrusion 31f2 can be a radially continuous ridge. In this other example, the oil contained in the gas can be made to collide with the ridge, and the oil that adheres to it can be guided centrifugally and smoothly ejected, thereby improving the oil collection efficiency.

[0072] As another example, in the mist collection filter 31X2, the convex portion 31f2 can be replaced with a concave portion in which the concave-convex relationship is reversed. That is, in this configuration as well, the flow of gas radially outward between the resistance plate 31f and the rotating filter 31a is disturbed to reduce its flow rate, and the flow rate of gas is increased near the outer diameter of the rotating filter 31a, thereby improving the oil collection efficiency. Also, similar to the convex portion 31f2 described above, the opportunity for gas stagnant in the gap s to come into contact with the hole 31a1 is increased, particularly near the center of the rotating filter 31a, thereby improving the oil collection efficiency.

[0073] <Another example of a mist collection filter 3> The mist collection filter 31X3 shown in Figure 16 is the same as the mist collection filter 31X1 (see Figure 14), but with the resistor plate 31e replaced by a resistor plate 31e'.

[0074] The resistor plate 31e' is provided with a curved portion 31e3 at the outer peripheral end of the resistor plate 31e having the above configuration, which is bent in a predetermined direction.

[0075] The curved portion 31e3 is bent and inclined from the outer peripheral end of the inclined plate portion 31e2 toward the rotating filter 31a (see Figure 16), and is continuous in an annular shape. The bending angle (inclination angle) of this curved portion 31e3 is adjusted so that it faces, for example, into the oil receiver 21 in the mist collection device 1 with the above configuration (see Figure 10).

[0076] Therefore, with the mist collection filter 31X3 shown in Figure 16, when oil adhering to the resistance plate 31e' is ejected centrifugally by the rotation of the resistance plate 31e', the direction of this oil ejection can be set to a predetermined direction. For example, as described above, the curved portion 31e3 can be directed into the oil receiver 21 of the mist collection device 1, and the ejected oil can be efficiently collected.

[0077] Other examples besides those shown include configurations in which the curved portion is provided at the outer peripheral end of the resistance plate 31b of the mist collection filter 31 (see Figure 1) or 31X4 (see Figure 17), or configurations in which the curved portion is provided at the outer peripheral end of the resistance plate 31f of the mist collection filter 31X2 (see Figure 15).

[0078] <Another example of a mist collection filter 4> The mist collection filter 31X4 shown in Figure 17 separates the rotating filter 31a and the resistance plate 31b, and these rotating filter 31a and resistance plate 31b are mounted on the drive rotation shafts M1a and M2a of different motors M1 and M2, respectively.

[0079] The drive shafts M1a and M2a are each supported by the housing of the mist collection device via brackets, casings, etc. (not shown). At this time, the gap s between the rotating filter 31a and the resistance plate 31b is maintained at a substantially constant level.

[0080] With this mist collection filter 31X4, by appropriately controlling the two motors M1 and M2, the rotating filter 31a and the resistance plate 31b can be rotated in various control patterns, such as rotating them synchronously in the same direction, rotating them in the same direction at different speeds, rotating them in different directions, rotating the resistance plate 31b while the rotating filter 31a is stopped, or rotating the rotating filter 31a while the resistance plate 31b is stopped.

[0081] In particular, when the rotating filter 31a and the resistance plate 31b are rotated in the same direction, compared to when the resistance plate 31b is not rotated, the oil mist (gas) flowing through the gap s between the rotating filter 31a and the resistance plate 31b is more likely to form a swirling flow on the side of the rotating filter 31a opposite to the suction side. As a result, the oil adhering to the resistance plate 31b is more easily ejected smoothly to the outer circumference along the swirling flow.

[0082] Furthermore, when the resistance plate 31b is rotated in the opposite direction to the rotating filter 31a, compared to when the resistance plate 31b does not rotate or when the resistance plate 31b rotates in the same direction as the rotating filter 31a, the resistance plate 31b rotates in the opposite direction to the swirling flow generated on the side opposite to the intake side of the rotating filter 31a. As a result, the relative peripheral speed of the resistance plate 31b with respect to the air containing oil mist increases. Therefore, the possibility of oil mist coming into contact with the resistance plate 31b and being collected increases, and consequently, the oil collection efficiency of the mist collection filter 31 can be improved.

[0083] <Other Modifications> In the above embodiment, a gap s is provided between the rotating filter 31a and the resistance plate 31b as a preferred example. However, in other examples, it is also possible to omit the gap s and configure the rotating filter 31a and the resistance plate 31b to be in contact.

[0084] According to the above embodiment, multiple holes 31a1 are provided in a multi-layered manner in the radial direction of the rotating filter. However, in another example, it is also possible to replace these holes 31a1 with single-layered holes that are elongated in the radial direction. In this other example, each single-layered hole has a through portion that does not face the resistance plate 31b closer to the outer diameter of the rotating filter, and a through portion that faces the resistance plate closer to the center of the rotating filter than this through portion.

[0085] In the above embodiment, the shape, number, and arrangement of each hole 31a1 are not limited to those shown in the illustrated example. For example, each hole 31a1 can be a round hole, a square hole, or the holes 31a1 can be arranged randomly.

[0086] According to the above embodiment, the resistance plates 31b, 31e, and 31f do not have through-holes or notches. However, these resistance plates can also have through-holes or notches, as long as they are provided on the side opposite to the suction side of the rotating filter 31a and act as resistance to the gas passing through the holes 31a1 of the rotating filter 31a.

[0087] According to the above embodiment, the mist collection filter and mist collection device with the above configuration are mainly used to collect oil, but these mist collection filters and mist collection devices can also be used as filters and devices to collect substances other than oil, such as mist-like water or liquids.

[0088] According to the above embodiment, a range hood with a ventilation function was configured as an example of a mist collection device 1 equipped with a mist collection filter 31. However, as an example, the mist collection filter can also be applied to ventilation devices other than range hoods, such as exhaust fans, air purifiers, and air conditioning equipment.

[0089] Furthermore, the features of each of the above embodiments can be appropriately combined and used depending on the specifications required at the time. In addition, the present invention is not limited to the specific configurations described above and can be appropriately modified without changing the gist of the present invention.

[0090] <Summary> As described above, the above embodiment discloses the following invention: (1) A mist collection filter (see Figures 1 to 4, 7 to 16, etc.) comprising a rotating filter having holes for passing gas, and a resistance plate provided on the side of the rotating filter opposite to the suction side, which acts as resistance to the gas passing through the holes, wherein the rotating filter and the resistance plate are configured to be mounted on a drive rotating shaft and rotate. Here, "mounting" includes both direct mounting and indirect mounting. That is, the configuration "the rotating filter and the resistance plate are configured to be mounted on a drive rotating shaft and rotate" includes a configuration in which both of the rotating filter and the resistance plate are directly mounted on the drive rotating shaft and rotate, a configuration in which both are indirectly mounted on the drive rotating shaft via a bracket or sleeve, a configuration in which one is directly mounted on the drive rotating shaft and the other is indirectly mounted on the drive rotating shaft, and so on. Furthermore, the configuration described above as "the rotating filter and the resistance plate are mounted on a drive rotating shaft and configured to rotate" includes a configuration in which only one of the rotating filter and the resistance plate is mounted directly or indirectly to the drive rotating shaft and configured to rotate, and the other is integrally provided with respect to the other. (2) The mist collection filter according to (1), characterized in that the rotating filter and the resistance plate rotate together (see Figures 1 to 4, 7 to 15, etc.). Here, the configuration described above as "the rotating filter and the resistance plate rotate together" includes a configuration in which the rotating filter and the resistance plate, which are separate components, are connected so as to rotate together, or a configuration in which the rotating filter and the resistance plate are integrally formed inseparable from each other. (3) The mist collection filter according to (1) or (2), characterized in that the rotating filter and the resistance plate are detachably connected (see Figure 4). (4) The mist collection filter according to (1), characterized in that a gap is provided between the rotating filter and the resistance plate (see Figures 1, 14 to 16, etc.). (5) The mist collection filter according to (5), characterized in that the gap is maintained at a substantially constant length in the radial direction (see Figures 1, 16, etc.).(6) The mist collection filter according to (5), characterized in that the gap has a portion that increases toward the radially outward direction (see Figure 14). (7) The mist collection filter according to any one of (1) to (6), characterized in that the hole has a through portion that does not face the resistance plate, and a through portion that faces the resistance plate on the side of the rotating filter center that is closer to the center of the through portion (see Figures 1 to 3, etc.). (8) The mist collection filter according to any one of (1) to (7), characterized in that the surface of the resistance plate facing the rotating filter is formed smoothly (see Figures 1, 14, 16, etc.). (9) The mist collection filter according to any one of (1) to (7), characterized in that the surface of the resistance plate facing the rotating filter has a convex portion and / or a concave portion (see Figure 15, etc.). (10) The mist collection filter according to 1, characterized in that the resistance plate has a curved portion at its outer peripheral end that is bent in a predetermined direction (see Figure 16). (11) A mist collection device according to any one of (1) to (10), characterized by comprising the mist collection filter (see Figures 5 to 13, etc.).

[0091] 1 Mist collection device 10 Housing 21 Oil receiver 22 Oil recovery section 23 Rectifier plate 31, 31X1, 31X2, 31X3, 31X4 Mist collection filter 31a Rotating filter 31a11 Through portion not facing the resistance plate 31a12 Through portion facing the resistance plate 31b, 31e, 31f Resistance plate 31f1 Resistance plate body 31f2 Protrusion 33a Drive rotation shaft M1a, M2a Drive rotation shaft s, s' Gap

Claims

1. A mist collection filter comprising a rotating filter having holes for passing gas, and a resistance plate provided on the side of the rotating filter opposite to the suction side, which acts as resistance to the gas passing through the holes, wherein the rotating filter and the resistance plate are mounted on a drive rotating shaft and rotated.

2. The mist collection filter according to claim 1, characterized in that the rotating filter and the resistance plate rotate together.

3. The mist collection filter according to claim 1, characterized in that the rotating filter and the resistance plate are detachably connected.

4. The mist collection filter according to claim 1, characterized in that a gap is provided between the rotating filter and the resistance plate.

5. The mist collection filter according to claim 4, characterized in that the gap is maintained at a substantially constant length in the radial direction.

6. The mist collection filter according to claim 4, characterized in that the gap has a portion that increases toward the radially outward direction.

7. The mist collection filter according to claim 1, characterized in that the hole has a through portion that does not face the resistance plate, and a through portion that faces the resistance plate on the side of the through portion that is closer to the center of the rotating filter.

8. The mist collection filter according to claim 1, characterized in that the surface of the resistance plate facing the rotating filter is formed smoothly.

9. The mist collection filter according to claim 1, characterized in that the resistance plate has a convex portion and / or a concave portion on the surface facing the rotating filter.

10. The mist collection filter according to claim 1, characterized in that the resistance plate has a curved portion at its outer peripheral end that is bent in a predetermined direction.

11. A mist collection device according to any one of claims 1 to 10, characterized by comprising the mist collection filter.

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