Exhaust purification device and exhaust purification device system

Abstract

To collect oil or the like intruding into an exhaust duct.　The present invention comprises a filter, a housing in which the filter is rotatably incorporated, and a drive device that causes the filter to rotate. The filter has a large number of holes from the peripheral-edge side to the center. The housing is of a substantially cylindrical shape and covers the periphery of the filter, the housing being configured to be mounted in a ventilation passage of an exhaust duct. The drive device is provided with a motor part and a motive power transmission mechanism for transmitting the rotational force of the motor part to the filter. The motor part is provided to the outer side of the peripheral wall of the housing.

Description

Exhaust purification device and exhaust purification system

[0001] The present invention relates to an exhaust gas purifying device and an exhaust gas purifying system to be installed in a ventilation duct of a building where oily smoke is generated indoors, such as a kitchen, a food factory, or a machine processing factory.

[0002] Oily smoke generated in kitchens, food factories, machine processing factories, etc. is sucked into exhaust ducts by ventilation fans or range hoods and then discharged to the outside through the exhaust duct. This can lead to oil, moisture, dust, dirt, etc. adhering to the inside of the exhaust duct, its entrance / exit, blower, etc., requiring significant labor and expense for maintenance such as cleaning, and can accelerate equipment deterioration. Furthermore, oil accumulated in the exhaust duct can contribute to duct fires. To address this issue, one known invention (Patent Document 1) involves attaching a cooking exhaust exhaust device to the entrance of the exhaust duct and capturing oil and other contaminants using a grease filter fixed inside the cooking exhaust exhaust device.

[0003] Japanese Patent Application Laid-Open No. 2019-81139

[0004] However, with the above-mentioned conventional technology, oil, moisture, dust, dirt, etc. that are not completely removed by the grease filter may enter the exhaust duct and contaminate the inside of the duct, the duct outlet, the blower, etc.

[0005] In view of the above problems, one aspect of the present invention provides an exhaust purification device having the following configuration: a filter, a housing that rotatably houses the filter, and a drive unit that rotates the filter, the filter having a large number of holes from the periphery to the center, the housing being generally cylindrical and covering the periphery of the filter and configured to be installed in the ventilation path of an exhaust duct, the drive unit having a motor unit and a power transmission mechanism that transmits the rotational force of the motor unit to the filter, the motor unit being provided on the outside of the peripheral wall of the housing.

[0006] Since the present invention is configured as described above, it is possible to collect oil and the like that has entered the exhaust duct.

[0007] 10 is a schematic diagram of an exhaust purification system including an example of an exhaust purification device according to the present invention;

[0023] FIG. 10 is a perspective view of the exhaust purification device as viewed obliquely from the upstream side;

[0024] FIG. 10 is a perspective view of the exhaust purification device as viewed obliquely from the downstream side;

[0025] FIG. 10 is a six-view diagram of the exhaust purification device;

[0026] FIG. 10 is a perspective view of the exhaust purification device with the front plate and filter removed;

[0027] FIG. 10 is a perspective view showing a state in which a connecting portion and a rear plate are further removed from the state of FIG. 5;

[0028] FIG. 10 is a view of the filter as viewed from the upstream side, showing an enlarged view of essential parts;

[0029] FIG. 10 is an exploded perspective view showing the support member, cover member, side plate, vibration damping member, etc.;

[0030] FIG. 10 is a perspective view of the exhaust purification device with the upper half of the housing, support member, etc. cut away to reveal the internal structure;

[0031] FIG. 10 is a cross-sectional view of the exhaust purification device, showing the drive device and gas flow with two-dot chain lines;

[0032] FIG. 10 is a cross-sectional view of an enlarged view of the essential parts of FIG. 10, showing the drive device and gas flow with two-dot chain lines;

[0033] FIG. 10 is a cross-sectional view of an enlarged view of the essential parts of FIG. 10, showing the drive device and gas flow with two-dot chain lines;

[0034] FIG. 10 is a perspective view of another embodiment of the exhaust purification device according to the present invention, seen obliquely from the downstream side. 1 is a schematic diagram showing the arrangement of a reinforcing member and a supporting member of the exhaust purification device, and FIG.

[0008] Next, an embodiment of the present invention will be described in detail with reference to the drawings. An exhaust purifying system A is installed in a building where oily smoke is generated indoors, such as a kitchen, a food factory, or a machine processing factory. This exhaust purifying system A includes an exhaust duct 1, a hood 2 connected to an intake port 1a of the exhaust duct 1, an exhaust purifying device 3 installed downstream of the intake port 1a in the exhaust duct 1, and a blower 4 that exhausts gas downstream of the exhaust purifying device 3 in the exhaust duct 1 (see FIG. 1 ).

[0009] The illustrated exhaust duct 1 is made of tubular or cylindrical members, and forms an exhaust path having an intake port 1a on the indoor side of the building and an exhaust port 1b on the outdoor side of the building.

[0010] The illustrated exhaust duct 1 extends upward from a downward-facing intake port 1a, passes through the ceiling, and is then guided in a substantially horizontal direction through a bent portion 1c, passing through an exhaust cleaning device 3, a blower 4, and other components, toward an exhaust port 1b. The bent portion 1c of the exhaust duct 1 causes inertial collision of oil in the air passing through the exhaust duct 1. This inertial collision increases the particle size of the oil, making it easier for it to be captured by the exhaust cleaning device 3 downstream.

[0011] The hood 2 ensures that air is efficiently drawn into the intake port 1a of the exhaust duct 1. The hood 2 in the illustrated example is formed in a generally trumpet-like shape with an opening at the bottom, and its upper end opening is connected to the intake port 1a of the exhaust duct 1. Note that the hood 2 may have a shape other than that shown in the illustration, or may be a range hood equipped with a blower or the like.

[0012] The exhaust purification device 3 comprises a filter 10 that is forced to rotate, a housing 20 that houses the filter 10 so that the filter 10 can rotate, a resistance plate 30 that is provided downstream of the filter 10 and close to the filter 10, a support member 40 that supports the filter 10 and the resistance plate 30 from the downstream side, and a drive device 50 that rotates the filter 10 (see Figures 2, 3, 9, etc.).

[0013] The filter 10 is formed in a thin disk shape and has a number of holes 11 extending from its periphery to its center, and an axial hole 12 in its center (see FIG. 7).

[0014] Each hole 11 is an elongated hole that inclines in the rotation direction (clockwise in FIG. 7 ) while moving toward the center of the filter 10. A plurality of these holes 11 are provided at predetermined intervals in the circumferential direction of the filter 10, and are further provided in multiple layers at predetermined intervals in the radial direction of the filter 10. When each hole 11 moves at high speed in the circumferential direction of the filter 10 as the filter 10 rotates, oil, moisture, dust, dirt, etc. contained in the gas passing through each hole 11 come into contact with the inner edge of the hole 11 and are blown away in the centrifugal direction.

[0015] The shaft hole 12 is connected to a drive rotation shaft 52c (see FIG. 10) of the drive unit 50 so as to be rotatable together with the drive rotation shaft 52c.

[0016] The housing 20 is configured in a rectangular cylindrical shape that covers the periphery of the filter 10 and is attached to the air passage of the exhaust duct 1. More specifically, as illustrated in FIG. 1 , the substantially horizontal portion of the exhaust duct 1 is divided into two sections. An exhaust cleaning device 3 and a blower 4 are attached to each of these two sections. As another example, the substantially horizontal portion of the exhaust duct 1 may be divided into two sections, and the exhaust cleaning device 3 and the blower 4 connected in series may be provided at this divided section. As a further example, the exhaust cleaning device 3 and the blower 4 may be installed in the internal space of the undivided exhaust duct 1.

[0017] The housing 20 comprises a front plate portion 21 that closely covers the surrounding areas of the numerous holes 11 in the filter 10 from the upstream side, a rear plate portion 22 that closely covers the surrounding areas of the numerous holes 11 in the filter 10 from the downstream side, a first connecting portion 23 and a second connecting portion 24 that connect and reinforce the front plate portion 21 and the rear plate portion 22 (see Figures 5 and 6), and a peripheral wall 25 that surrounds the filter 10, the front plate portion 21, the rear plate portion 22, the first connecting portion 23, etc. in an approximately cylindrical shape.

[0018] The front plate 21 is located upstream of the filter 10 and has a generally circular front plate opening 21a at its center. The front plate 21 is formed in a generally rectangular plate shape large enough to include the filter 10, with its peripheral edge bent toward the rear plate 22 (see FIG. 5).

[0019] The front plate opening 21a is located inside the outer periphery of the filter 10 when viewed from the direction of the rotation axis of the filter 10. The inner diameter of this front plate opening 21a is smaller than the outer diameter of the filter 10 and is set to a size that includes almost all of the numerous holes 11 of the filter 10. By setting this size relationship, even if the filter 10 falls off the drive rotation shaft 52c, it is possible to prevent the filter 10 from flying upstream of the front plate 21.

[0020] The rear plate 22 is located downstream of the filter 10 and has a rear plate opening 22a at its center. The rear plate 22 is formed in a generally rectangular plate shape having substantially the same size as the front plate 21, with its peripheral edge bent toward the front plate 21 (see FIG. 6 ).

[0021] The rear plate opening 22a is located inside the outer circumferential edge of the filter 10 when viewed from the rotation axis direction of the filter 10. The inner diameter of the rear plate opening 22a is smaller than the outer diameter of the filter 10 and is set to a size that includes almost all of the numerous holes 11 of the filter 10. This size relationship prevents the filter 10 from flying downstream of the rear plate portion 22, even if the filter 10 falls off the drive rotation shaft 52c. Furthermore, the inner diameter of the rear plate opening 22a is approximately the same as the inner diameter of the front plate opening 21a. This allows oily smoke and the like to pass smoothly through the numerous holes 11 of the filter 10 between the front plate opening 21a and the rear plate opening 22a, thereby efficiently capturing oil, moisture, dust, dirt, and the like contained in the oily smoke and the like.

[0022] The inner edge of the front plate opening 21a and / or the inner edge of the rear plate opening 22a may overlap the hole 11 of the filter 10 slightly within a range that does not cause support due to manufacturing errors, etc.

[0023] The space between the front plate 21 and the rear plate 22 is closed at its peripheral edge by a peripheral wall 25. The peripheral edge portions of the front plate 21 and the rear plate 22 are closed by the peripheral wall 25, forming a generally bag-shaped cross section. This generally bag-shaped cross section is continuous in an annular shape, and the portion near the lower end functions as a collection portion 28 that collects matter captured by the filter 10 (for example, oil, water, dust, dirt, etc.).

[0024] That is, the matter captured by the rotating filter 10 is collected in the peripheral portion having a generally bag-shaped cross section by centrifugal force, and then moves downward under its own weight to accumulate in the collection section 28. Furthermore, the vapor contained in the gas passing through the filter 10 condenses upon contact with the resistance plate 30 and the support member 40. This condensed matter (e.g., water, etc.) accumulates below the resistance plate 30 and the support member 40 within the housing 20. The trapped matter, condensed matter, etc. accumulated in this manner may be discharged to the outside of the exhaust cleaning device 3 and the exhaust duct 1 by appropriate discharge means (e.g., a drain pipe, not shown). In this case, it is also preferable to provide a hole in the bottom of the housing for discharging oil and the like so that the oil and the like can be discharged to the outside of the exhaust cleaning device 3 and the exhaust duct 1.

[0025] A plurality of first connection portions 23 are arranged in a substantially annular shape surrounding the filter 10, sandwiched between the front plate portion 21 and the rear plate portion 22 (see FIGS. 5 and 6 ). According to a preferred example of this embodiment, the first connection portions 23 are provided at four locations corresponding to the four corners of the housing 20. The plurality of first connection portions 23 are arranged in point symmetry with respect to the center of rotation of the filter 10. Each first connection portion 23 is provided on a line connecting a corner of the housing 20 and the center of rotation of the filter 10, so as to be substantially parallel to a tangent to the outer periphery of the filter 10. Each first connection portion 23 is fastened to both the front plate portion 21 and the rear plate portion 22 by appropriate fastening means (e.g., screws, rivets, etc.).

[0026] A plurality of second connecting portions 24 are provided between the front plate portion 21 and the rear plate portion 22, close to one end and the other end of each first connecting portion 23 (see FIGS. 5 and 6 ). Each second connecting portion 24 is a stepped shaft-shaped member with one end reduced in diameter, and one end is fitted into a fitting hole (not shown) in the rear plate portion 22, while the other end is fastened to the front plate portion 21 with a screw, rivet, or the like. The second connecting portions 24 maintain the positional relationship between the front plate portion 21 and the rear plate portion 22 with high precision.

[0027] The first connecting portion 23 and the second connecting portion 24 configured as described above maintain an appropriate distance between the front plate portion 21 and the rear plate portion 22 and increase the overall rigidity of the front plate portion 21 and the rear plate portion 22, thereby reducing vibration and noise of the front plate portion 21 and the rear plate portion 22. In particular, the first connecting portion 23 is provided in an elongated shape that is approximately parallel to the outer circumferential tangent of the filter 10, thereby effectively suppressing vibration and vibration noise that accompanies rotation of the filter 10. Furthermore, the first connecting portion 23 and the second connecting portion 24 configured as described above can prevent the front plate portion 21 and the rear plate portion 22 from deforming due to wind pressure and coming into contact with the filter 10.

[0028] According to the above embodiment, the first connection portion 23 is provided at intervals in the circumferential direction. However, as another example, the first connection portion 23 may be formed in an endless ring shape (including a circular ring shape, a polygonal ring shape, etc.). For example, if the first connection portion 23 is formed in a polygonal ring shape, oil tends to accumulate in the corners, so oil recovery portions can be provided in the corners to facilitate oil recovery. Furthermore, if the first connection portion 23 is formed in a circular ring shape, the captured oil will circulate, so oil recovery portions can be provided in the tangential direction of the circular first connection portion 23 to efficiently recover the circulating oil.

[0029] The peripheral wall 25 is formed into a rectangular cylindrical shape by four side plates 25a, 25b, 25c, and 25d (see FIG. 4). The four side plates 25a, 25b, 25c, and 25d are provided with vibration-damping members 26a, 26b, 26c, and 26d, respectively. A rectangular frame member 29 is attached to the rear ends of the four side plates 25a, 25b, 25c, and 25d (see FIG. 3).

[0030] The upper side plate 25a is a rectangular plate-like member in a plan view, and the edge portions on each side of this side plate 25a are bent upward for reinforcement or the like.

[0031] The vibration-damping member 26a is provided near the center of the peripheral wall 25 (side plate 25a) in the front-to-rear direction and extends elongatedly along the longitudinal direction (circumferential direction) of the peripheral wall 25 (side plate 25a). The vibration-damping member 26a has a generally hat-shaped cross section that is open downward and continues in the left-right width direction.

[0032] The lower side plate 25b and the vibration damping member 26b are configured to be vertically symmetrical with respect to the upper side plate 25a and the vibration damping member 26b.

[0033] The side plate 25c, located opposite the side plate 25d equipped with the motor, is formed in a generally rectangular shape with the edges of all four sides folded, similar to the side plate 25a. This side plate 25c is provided with an air vent 25c1 that communicates with one open end of the support member 40, which will be described later. This air vent 25c1 allows ventilation between the internal space of the support member 40 and the external space of the peripheral wall 25.

[0034] The vibration-damping member 26c that reinforces the side plate 25c is formed in a long shape with a continuous hat-shaped cross section, similar to the vibration-damping member 26a.

[0035] The side plate 25d located on the side where the motor is provided is formed in a generally rectangular shape with the edges of all four sides folded, similar to the side plate 25a. This side plate 25d is provided with a circular motor support hole 25d1 for receiving the motor section 51 of the drive unit 50, and ventilation holes 25d2 and 25d3 that communicate with the other open end of the support member 40 (described later) (see FIG. 8).

[0036] The motor section 51 of the drive unit 50 is secured to the side plate 25d by fitting the stepped portion of the outer periphery at the front end into the motor support hole 25d1 of the side plate 25d with fasteners 51a such as bolts or screws (see Figure 10).

[0037] In this way, the motor section 51 is exposed to the outside of the peripheral wall 25, facilitating maintenance of the motor section 51. Furthermore, the motor section 51 is prevented from being heated by heat inside the exhaust duct 1, thereby preventing the spread of fire and electric leakage in the event of a duct fire. Furthermore, since it is no longer necessary to use a motor designed to withstand high humidity, the exhaust purification device 3 can be constructed at a relatively low cost.

[0038] The fastener 51a is inserted from the outside into the flange 51b (see FIG. 9) on the front end side of the motor unit 51, and the male threaded portion on the tip side thereof penetrates the side plate 25d. A washer, a nut, etc. are screwed onto the male threaded portion of the fastener 51a that penetrates the side plate 25d and tightened.

[0039] A cover member 27d is provided on the inner surface of the side plate 25d so as to cover the male threads at the tip end of the fasteners 51a and the nuts threaded onto the male threads. The cover member 27d is formed in a generally horizontally concave box shape that covers the ends of the multiple fasteners 51a and is fixed to the inner surface of the side plate 25d. The cover member 27d prevents interference between the connection portion (fasteners 51a) of the motor unit 51 to the side plate 25d and the connection portion of the support member 40 to the side plate 25d.

[0040] Furthermore, by being interposed between the side plate 25d and the support member 40, the cover member 27d reduces the size (thinnerness) of the support member 40. In other words, if the cover member 27d were not present, the entire support member 40 would need to be increased in size in the radially outward direction of the power transmission shaft 52a to prevent the support member 40 from interfering with the fastener 51a. However, according to this embodiment, the cover member 27d prevents interference with the fastener 51a and allows the support member 40 to be reduced in size (thinnerness), thereby reducing the resistance that the support member 40 provides to the gas flowing inside the housing 20.

[0041] The cover member 27d is also provided with a shaft through-hole 27d1 through which the output shaft of the motor unit 51 is rotatably inserted, and an air hole 27d2 communicating with the internal space of the support member 40 (see FIG. 8).

[0042] The vibration-damping member 26d has a hollow cross section that is breathable and continues elongated in the longitudinal direction (circumferential direction) of the peripheral wall 25 (side plate 25d) near the motor unit 51. Both longitudinal ends of the vibration-damping member 26d are open, and the end openings 26d3 communicate with the external space of the housing 20. The vibration-damping member 26d is provided with a motor through-hole 26d1 through which the motor unit 51 is inserted and a plurality of ventilation holes 26d2 (see FIG. 8).

[0043] The internal space of the damping member 26d is in communication with the external space of the housing 20 via the end opening 26d3, the ventilation hole 26d2, etc. Furthermore, the internal space of the damping member 26d is in communication with the internal space of the support member 40 via the ventilation hole 25d3 of the side plate 25d and the ventilation hole 27d2 of the cover member 27d, etc. (see FIGS. 10 and 11 ). With this configuration, the internal space of the damping member 26d functions as a passage for the flow of gas (refrigerant) outside the housing 20, and the flow of gas inside the damping member 26d can suppress heat generation from the motor unit 51.

[0044] In addition to the function of allowing gas to pass through the inside and outside of the vibration damping member 26d as described above, the ventilation holes 26d2 of the vibration damping member 26d also function as holes for fastening fasteners 27d3 (screws, bolts, etc.) that fasten the cover member 27d to the side plate 25d. That is, a tool such as a screwdriver (not shown) is inserted into the ventilation holes 26d2, and the fasteners 27d3 are tightened by this tool (see FIG. 11 ).

[0045] Similarly, the ventilation hole 25d3 of the side plate 25d not only functions to allow gas to pass through the inside and outside of the cover member 27d, but also functions as a hole for fastening the fastener 41 (screw, bolt, etc.) that fastens the support member 40 to the side plate 25d (see Figure 11).

[0046] The frame member 29 is formed in the shape of an integral rectangular frame and is attached to the rear ends of the four side plates 25a, 25b, 25c, and 25d.

[0047] The vibration-damping members 26a, 26b, 26c, and 26d and the frame member 29 configured as described above increase the rigidity of the entire peripheral wall 25, thereby reducing vibration and noise associated with rotation of the filter 10. Furthermore, when the peripheral wall 25 becomes hot, the vibration-damping members 26a, 26b, 26c, and 26d reduce the transfer of heat from the peripheral wall 25 to the surrounding areas. For example, when the exhaust purifying system A is used to waste heat from a cooking appliance or the like, the peripheral wall 25 may reach 80°C or higher. In such a case, if a worker, for example, directly touches the peripheral wall 25 during maintenance or the like, there is a risk of being burned. However, by encouraging the worker to touch the vibration-damping members 26a, 26b, 26c, and 26d instead of the peripheral wall 25, the risk of such burns can be reduced.

[0048] The resistance plate 30 is formed in a circular, flat plate shape and is supported by a support member 40 adjacent to the downstream side of the holes 11 located near the center of the filter 10 among the many holes 11 in the filter 10. This resistance plate 30 acts as a resistance to gas passing through the holes 11 located near the center. That is, the flow velocity of gas flowing through the exhaust duct 1 is higher near the center. Therefore, if the resistance plate 30 were not present, a large amount of oily smoke and the like would flow relatively fast near the center of the filter 10, but the peripheral speed near the center of the filter 10 would be slow, resulting in a decrease in collection efficiency. However, with the exhaust purification device 3 of this embodiment, the flat resistance plate 30 acts as a resistance to the oily smoke and the like flowing near the center of the filter 10, so the flow rate of the oily smoke and the like flowing near the outer diameter of the filter 10 is relatively increased. Therefore, the portion of the filter 10 near the outer diameter, which has a fast peripheral speed, can efficiently capture oil, water, dust, dirt, and the like contained in the oily smoke and the like.

[0049] The resistance plate 30 having the above-described configuration is firmly fixed to the support member 40 so that it will not cause any problems even when subjected to a large amount of airflow. In the illustrated example, this fixing means is screw fastening, but riveting, welding, fitting, etc. can also be used.

[0050] The relationship between the outer diameters of the filter 10 and the resistor plate 30 is, for example, 500 mm for the filter 10 and 300 mm for the resistor plate 30 in the case of a large air volume type. In addition, as an example of a type with a smaller air volume, the outer diameter of the filter 10 is 300 mm and the outer diameter of the resistor plate 30 is 160 mm. The optimum distance between the filter 10 and the resistor plate 30 is within a range of 10 to 60 mm, and more preferably within a range of 20 to 45 mm.

[0051] The support member 40 is a hollow, elongated member that rotatably supports the filter 10 and non-rotatably supports the resistance plate 30, and is located in the space inside the housing 20. Explaining the illustrated example in detail, one end of the support member 40 is supported on the inner wall surface of the peripheral wall 25 (side plate 25c), and the other end of the support member 40 is supported on the surface of the cover member 27d toward the center of the housing 20. As other examples, the other end of the support member 40 may be directly supported on the inner wall surface of the peripheral wall 25, or the integral side and / or the other end of the support member 40 may be supported on the inner wall surface of the peripheral wall 25 via an intermediate member other than the illustrated example.

[0052] The support member 40 is located downstream of the filter 10 and is substantially perpendicular to the central axis of the filter 10. The internal space of the support member 40 communicates with the space outside the housing 20.

[0053] More specifically, the support member 40 is formed by bending one or more pieces of sheet metal material into a generally rectangular tubular shape having open ends on both sides in the longitudinal direction.

[0054] One open end of the support member 40 is connected to the inner surface of the side plate 25c opposite the side plate provided with the motor, so as to include the ventilation hole 25c1 of the side plate 25c (see Figures 9 and 10), while the other open end of the support member 40 is connected to the cover member 27d fixed to the inner surface of the side plate 25d, so as to include the ventilation hole 27d2 of the cover member 27d.

[0055] With these configurations, as shown in Figures 9 and 10, outside air on the opposite side of the motor in the exhaust purification device 3 enters the space within the support member 40 through the ventilation hole 25c1, and then passes through the ventilation holes 27d2, 25d2, 25d3, and 26d2 near the motor section 51 and escapes to the outside of the exhaust purification device 3.

[0056] That is, the internal space of the support member 40 functions as a passage for flowing air as a refrigerant to cool the support member 40, the resistance plate 30, the drive unit 50, etc. The internal space of the support member 40 also includes a power transmission mechanism 52 for the drive unit 50, and functions as a power transmission path.

[0057] The support member 40 configured as described above immobilizes the central portion of the resistance plate 30 on its upstream side. Furthermore, the support member 40 rotatably supports the filter 10 upstream of the resistance plate 30 via an internal drive unit 50. This support member 40 firmly fixes the resistance plate 30, effectively reducing wobble, vibration, and the like of the resistance plate 30.

[0058] The drive device 50 includes a motor unit 51 and a power transmission mechanism 52 that transmits the rotational force of the motor unit 51 to the filter 10 .

[0059] The motor unit 51 is an electric motor. The output shaft of the motor unit 51 passes through the vibration damping member 26d, the side plate 25d, and the cover member 27d, and is fixed to the outer surface of the side plate 25d by a fastener 51a (see FIG. 10).

[0060] The rotation speed of the motor unit 51 is appropriately controlled by a control circuit (not shown). More specifically, the rotation speed of the motor unit 51 is controlled by the control circuit or the like so that the circumferential speed of each hole 11 moving around the circumference as the filter 10 rotates is greater than the flow speed of the gas passing through the hole 11. This configuration makes it possible to effectively capture oil, moisture, dust, dirt, and the like contained in the gas passing through the filter 10. That is, if the circumferential speed of each hole 11 moving around the circumference as the filter 10 rotates is slower than the flow speed of the gas passing through the hole 11, the oil, moisture, dust, dirt, and the like contained in the gas may pass through each hole 11 without coming into contact with the inner edge of each hole 11. However, the above configuration increases the likelihood that the oil, moisture, dust, dirt, and the like contained in the gas will come into contact with the inner edge of each hole 11.

[0061] The power transmission mechanism 52 is configured to transmit the rotational force of the motor unit 51 into the housing 20 and use this rotational force to drive and rotate the filter 10. In detail, the power transmission mechanism 52 includes a power transmission shaft 52a that transmits the rotational force of the motor unit 51 to the center of the housing 20, a rotational axis direction conversion device 52b that converts the rotational force of the power transmission shaft 52a into rotational force concentric with the filter 10, and a drive rotation shaft 52c that drives and rotates the filter 10 using the rotational force that is converted in direction and transmitted by the rotational axis direction conversion device 52b (see FIGS. 9 and 10 ).

[0062] The power transmission shaft 52a is provided inside the support member 40 so as to be approximately perpendicular to the central axis of the filter 10. One end of this power transmission shaft 52a is concentrically connected to the output shaft of the motor unit 51, and the other end extends toward the center of the housing 20.

[0063] The rotational axis direction converter 52b is a device that converts the direction of the rotational axis to a substantially right angle, and is configured, for example, by a gear mechanism in which two bevel gears mesh. This rotational axis direction converter 52b is connected to the output side of the power transmission shaft 52a inside the support member 40.

[0064] The drive rotation shaft 52c is an axial member that is provided approximately concentrically with the central axis of the filter 10. This drive rotation shaft 52c penetrates the peripheral wall of the support member 40, with one end connected to the output shaft of the rotation axis direction converter 52b inside the support member 40, and the other end loosely inserted into the peripheral wall of the support member 40 and the resistance plate 30, and connected to the center of the filter 10.

[0065] The blower 4 is a device that generates an air current in the exhaust duct 1 from the intake port 1a to the exhaust port 1b, and is configured to include, for example, a propeller fan, a sirocco fan, etc. The blower 4 causes the gas drawn into the intake port 1a to be forcibly transported downstream through the exhaust purification device 3 and then discharged from the exhaust port 1b.

[0066] <Effects> With the exhaust purifying device 3 and exhaust purifying device system A configured as described above, when the blower 4 is driven to create a flow of oily smoke in the exhaust duct 1 from the intake port 1a to the exhaust port 1b, the exhaust purifying device 3 is driven to rotate the filter 10, and oil, moisture, dust, dirt, and other substances contained in the gas passing through the filter 10 are blown radially outward and collected in the collection section 28. In this way, according to this embodiment, oil and other substances that have entered the exhaust duct 1 can be efficiently collected. This also makes it unnecessary to replace the existing cooking exhaust exhaust device.

[0067] In addition to passing gas in the axial direction of the filter 10 as described above, the exhaust purification device 3 also passes gas from the side through the support member 40. That is, on the side opposite the side plate on which the motor is mounted, gas outside the housing 20 enters the support member 40 through the vent 25c1 by natural convection or the like, as shown in FIGS. 10 and 11 , flows through the support member 40 toward the motor side, and then flows out to the outside of the motor side through the vent 27d2 in the cover member 27d, the vents 25d2 and 25d3 in the side plate 25d, the vent 26d2 and end opening 26d3 in the vibration damping member 26d, etc. Note that this gas flow direction may be reversed depending on the installation environment of the exhaust purification device 3, etc. The gas flow within the support member 40 described above cools the support member 40, the resistor plate 30, the drive unit 50, etc.

[0068] Therefore, the gas that has passed through the filter 10 is brought into contact with the cooled resistance plate 30 and support member 40, whereby the vapor contained in the gas is condensed and the condensed matter can be captured.

[0069] Therefore, the exhaust purification device 3 and the exhaust purification device system A can effectively capture oil, moisture, dust, dirt, etc. contained in the gas that has entered the exhaust duct 1, and ultimately reduce contamination of the inside of the exhaust duct 1 and the outlet of the exhaust duct 1, etc., with oil, moisture, dust, dirt, etc.

[0070] Moreover, since the motor unit 51 is provided on the outside of the peripheral wall 25 of the housing 20 and the power transmission path of the power transmission mechanism 52 is located inside the support member 40, the motor unit 51 and the power transmission mechanism 52 are prevented from becoming dirty with oil, water, dust, dirt, etc. that flows inside the exhaust duct 1, and the durability of the drive unit 50 can be maintained for a long period of time. In addition, the support member 40 can prevent heat inside the exhaust duct 1 from being transmitted to the power transmission mechanism 52 and further to the motor unit 51.

[0071] In the above embodiment, it is preferable to install the exhaust purification device 3 in the exhaust duct 1 so that the center of rotation of the filter 10 approximately coincides with the center of the exhaust duct 1. By doing so, oily smoke and the like passing through the exhaust duct 1 can be made to enter straight into the filter 10, further increasing the collection efficiency of the filter 10.

[0072] <Other Embodiments> Next, other embodiments of the exhaust purification device 3 of the present invention will be described. In the exhaust purification device 3 of this other embodiment, the motor unit 51 is attached at an upper position, different from the exhaust purification device 3 of the above-described embodiment (see FIGS. 12 and 13). By attaching the heavy motor unit 51 to the upper position in this way, the housing 20 is pressed down in the direction of gravity, thereby reducing vibration of the housing 20. Furthermore, by positioning the heavy motor unit 51 at the upper position of the housing, weight imbalance is reduced, which also has the effect of reducing vibration of the housing 20.

[0073] Furthermore, the housing itself is of a type in which the length of the housing 20 in the direction of the gas ventilation path is longer than the type shown in Figure 2. In this other embodiment, when the motor unit 51 is attached to the top, a reinforcing plate 55 is provided to reduce distortion of the top plate even when the heavy motor unit 51 is placed on the housing top plate. The reinforcing plate 55 is also fastened with screws 56. This configuration may be provided as needed (see Figures 13 and 14).

[0074] Next, in the exhaust purification device 3 of this other embodiment, the support member 40 is installed vertically relative to the bottom plate of the housing 20, and a reinforcing member 57 is provided for the bottom plate of the housing 20 downstream of the support member 40 (see FIGS. 14 and 15 ). The attachment of the reinforcing member 57 can increase the strength of the bottom surface of the housing 20 that supports the motor unit 51.

[0075] Furthermore, in this other embodiment, the reinforcing member 57 is installed so as to be in contact with or in close proximity to the support member 40. Furthermore, a pocket portion 59 is provided near the center of the reinforcing member 57 so as to encompass the lower portion of the rear surface of the motor unit 51 on the downstream side of the support member 40 (see FIG. 15 ).

[0076] This configuration is also optional, but is chosen for the following reason: Air tends to stagnate on the downstream back surface of the support member 40, where oil and other contaminants tend to accumulate. Furthermore, by arranging the support member 40 and the reinforcing member 57 in contact with each other, air stagnation can be alleviated, thereby reducing the accumulation of oil and other contaminants.

[0077] Furthermore, oil and the like that inevitably accumulates flows from pockets 59 provided in the reinforcing member 57 into the interior of the reinforcing member 57. The oil and the like that has flowed into the interior of the reinforcing member 57 seeps out from between the reinforcing member 57 and the bottom plate of the housing, and can be discharged to the outside of the exhaust cleaning device 3 and the exhaust duct 1 by being discharged from holes for discharging oil and the like. Furthermore, other configurations in this other embodiment (mechanism for transmitting the rotational force of the motor unit, support structure for the filter, etc.) can be configured in the same way as those described in the above embodiment. <Modifications>

[0078] According to each of the above embodiments, the housing 20 is formed in an approximately rectangular tubular shape, but other examples of the housing 20 include a cylindrical shape, a polygonal tubular shape other than a square, or a tubular shape other than the illustrated example.

[0079] In each of the above embodiments, as a particularly preferred example with low vibration, a first connecting portion 23 and a second connecting portion 24 are provided between the front plate portion 21 and the rear plate portion 22, but as another example, it is also possible to omit either or both of the first connecting portion 23 and the second connecting portion 24.

[0080] According to each of the above embodiments, gas flows inside and outside the support member 40 by natural convection or the like. However, as an example other than the illustrated example, a fan can be provided inside or outside the support member 40, and the fan can force air outside the housing 20 into the internal space of the support member 40. In this case, the fan is preferably provided near the air vent 25c1 (see FIG. 9) on the side opposite to the side where the motor is provided. That is, since there are fewer space limitations inside and outside the support member 40 near the air vent 25c1, a relatively large fan can be provided to further cool the inside of the support member 40.

[0081] According to each of the above embodiments, the fluid flowing within the support member 40 is air, but this fluid can also be a fluid other than air as long as it functions as a refrigerant to cool the support member 40, etc.

[0082] As another example of a means for cooling the support member 40 , a refrigerant pipe (not shown) may be inserted into the support member 40 .

[0083] Furthermore, as an additional configuration to each of the above embodiments, the exhaust duct 1 and the exhaust purifying device 3 may be cooled by the cold air of an air conditioner that cools or heats the air in the room.

[0084] Another method for cooling the exhaust duct 1 is to pass at least a portion of the exhaust duct 1 outdoors and cool the exhaust duct 1 with the outdoor air.

[0085] Furthermore, as another means for cooling the exhaust duct 1, a blower may be provided near the exhaust duct 1 to blow cool air such as outside air, and the exhaust duct 1 may be exposed to the air blown by this blower.

[0086] The exhaust purification device system A in each of the above embodiments is a system that is installed in a building where oily smoke is generated, as described above, but as another example, this exhaust purification device system A can also be applied as a configuration for a cooking appliance that generates oily smoke.

[0087] Furthermore, the present invention is not limited to the specific configurations described above, and can be modified as appropriate within the scope of the present invention.

[0088] <Summary> As described above, the above embodiments disclose the following inventions. (1) An exhaust purification device comprising a filter, a housing rotatably housing the filter, and a drive device for rotating the filter, wherein the filter has a number of holes extending from the periphery to the center, the housing is generally cylindrical and covers the periphery of the filter and is configured to be installed in an air passage of an exhaust duct, the drive device comprising a motor and a power transmission mechanism for transmitting the rotational force of the motor to the filter, the motor being provided outside the peripheral wall of the housing (see FIGS. 1 to 15). (2) An exhaust purification device according to (1), wherein the power transmission mechanism transmits the rotational force of the motor into the housing and drives and rotates the filter using the rotational force (see FIGS. 9 and 10). (3) The exhaust purification device according to (1) or (2), characterized in that it includes a hollow support member supported on the housing so as to support the filter from the downstream side, and the power transmission mechanism is provided in the internal space of the support member (see Figs. 9 and 10). (4) The exhaust purification device according to (3), characterized in that the motor unit is fastened to the outer surface of the peripheral wall of the housing by a fastener that penetrates the peripheral wall, and a cover member that covers an end of the fastener is provided on the inner surface of the peripheral wall, and the support member is connected to and supported by the cover member (see Figs. 9 to 11). (5) The exhaust purification device according to (3) or (4), characterized in that a vent hole is provided in the peripheral wall of the housing near the motor unit, and the vent hole communicates the space outside the housing with the internal space of the support member (see Figs. 9 to 11). (6) The exhaust purification device according to any one of (3) to (5), characterized in that the support member is formed in a substantially cylindrical shape, and an open end on one end and an open end on the other end are connected to the inner surface of the housing, and a vent hole is provided in the peripheral wall of the housing so as to communicate with the open end on the one end, and another vent hole is provided so as to communicate with the open end on the other end (see Figures 9 to 11).Here, the configuration "one end opening end and the other end opening end are connected to the inner surface of the housing" includes both an embodiment in which at least one of the opening ends is directly connected to the inner surface of the housing, and an embodiment in which the opening end is indirectly connected via an intermediate member such as the cover member or the mounting bracket. (7) The exhaust purification device according to any one of (1) to (6), characterized in that a vibration-damping member is provided along the peripheral wall of the housing near the motor unit to reduce vibration of the peripheral wall (see Figures 2, 4 to 6, and 8 to 11). (8) The exhaust purification device according to (7), characterized in that the vibration-damping member is formed in a ventilated hollow shape (see Figures 8 to 11). (9) An exhaust purification system (see Figure 1), characterized in that the exhaust purification device according to any one of (1) to (8) is provided downstream of an intake port in an exhaust duct. (10) The exhaust purification system according to (9) (see FIG. 1), characterized in that a blower for discharging gas is provided downstream of the exhaust purification device in the exhaust duct.

[0089] DESCRIPTION OF SYMBOLS 1 Exhaust duct 1a Intake port 1b Exhaust port 1c Bent portion 2 Hood 3 Exhaust air cleaning device 4 Blower 10 Filter 11 Hole 12 Shaft hole 20 Housing 21 Front plate portion 21a Front plate opening 22 Rear plate portion 22a Rear plate opening 23 First connecting portion 24 Second connecting portion 25 Peripheral wall 25a to 25d Side plates 25c1, 25d2, 25d3, 26d2, 27d2 Ventilation hole 25d1 Motor support hole 26a to 26c Vibration damping member 26d3 End opening 27d Cover member 27d1 Shaft through hole 27d3, 41 Fastener 28 Collection portion 29 Frame member 30 Resistance plate 40 Support member 50 Drive device 51 Motor portion 51a Fastener 52 Power transmission mechanism 52a Power transmission shaft 52b Rotational axis direction conversion device 52c Drive rotation shaft 55 Reinforcement plate 56 Screw 57 Reinforcement member 59 Pocket portion A Exhaust purification device system

Claims

The device includes a filter, a housing in which the filter is rotatably housed, and a drive device that rotates the filter, The filter has a large number of holes from the peripheral edge to the center, the housing is substantially cylindrical and covers the periphery of the filter, and is configured to be mounted in the ventilation path of the exhaust duct; the drive device includes a motor unit and a power transmission mechanism that transmits the rotational force of the motor unit to the filter, The exhaust purification device is characterized in that the motor unit is provided outside the peripheral wall of the housing.

2. The exhaust purification device according to claim 1, wherein the power transmission mechanism transmits the rotational force of the motor unit into the housing, and the filter is driven to rotate by the rotational force.

3. The exhaust purification device according to claim 2, further comprising a hollow support member supported by the housing so as to support the filter from the downstream side, and the power transmission mechanism is provided in the internal space of the support member. 　 the motor unit is fastened to an outer surface of the peripheral wall of the housing by a fastener that penetrates the peripheral wall, a cover member that covers an end of the fastener is provided on the inner surface of the peripheral wall; 4. The exhaust purification device according to claim 3, wherein the support member is connected to and supported by the cover member. 　 a vent hole is provided in the peripheral wall of the housing near the motor unit, 4. The exhaust purification device according to claim 3, wherein the vent hole connects a space outside the housing with a space inside the support member. 　 the support member is formed in a substantially cylindrical shape, and one open end portion and the other open end portion are connected to the inner surface of the housing, 4. The exhaust purification device according to claim 3, wherein a vent hole is provided in the peripheral wall of the housing so as to communicate with the open end on the one end side, and another vent hole is provided so as to communicate with the open end on the other end side.

2. The exhaust purification device according to claim 1, further comprising a vibration damping member provided along the peripheral wall of the housing in the vicinity of the motor section to reduce vibration of the peripheral wall.

8. The exhaust purification device according to claim 7, wherein the vibration damping member is formed in a hollow shape that allows ventilation. 　 An exhaust purification system comprising the exhaust purification device according to any one of claims 1 to 8, disposed downstream of an inlet of an exhaust duct.

10. The exhaust purification system according to claim 9, further comprising a blower for discharging gas, disposed downstream of the exhaust purification device in the exhaust duct.

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