Filter Casing

Abstract

To provide a filter casing excellent in maintainability where oil mist stored in a filter collecting oil mist can be quickly discharged and removed.SOLUTION: In a filter casing, a filter collecting oil mist is inclined since a filter fitting frame is inclined and disposed so that the upper side of the filter fitting frame of the filter casing is adjacent to the upstream side of an air stream; the oil mist is hardly stored at the downstream side of the air stream of a filter collecting the oil mist; the oil mist stored in the filter collecting the oil mist is flown down to a lower part by gravity; the flown down oil mist is received by an oil catcher and the oil mist is discharged outside; and maintainability is excellent since oil mist can be easily removed and quickly discharged from the inside of the filter.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a filter casing that can be suitably used for collecting oil mist in the air. [Background technology]

[0002] In environments where a lot of edible oils and fats are used, such as kitchens and food processing plants, and in environments where a lot of machine oil is used, such as factories, the air contains a lot of oil. Therefore, the oil in the air (oil mist) is collected and removed by passing it through a filter.

[0003] As a method for capturing and removing oil (oil mist) in the air, for example, as disclosed in JP 2020-111616 A (Patent Document 1), a filter frame that detachably supports a filter that captures oil mist and a filter support device that is combined with the middle of an exhaust duct or the end of an exhaust duct or the intake port of a dust collector are disclosed. Patent Document 1 also discloses that the filter frame has an upper frame, a side frame, a lower frame that supports the filter, and a gutter, and that the lower frame has a filter receiver on the oil receiving surface that supports the filter in a position floating from the oil receiving surface, and that the oil can be discharged by the oil receiving surface and the gutter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-111616 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the filter support device disclosed in Patent Document 1 has the problem that if oil mist accumulates on the downstream side of the airflow of the filter that collects the oil mist, the oil mist cannot be discharged from the filter, and as a result, the oil mist may not be discharged from the filter casing.In addition, the filter holder in the filter support device makes the structure complicated, which may cause problems when attaching and removing the filter frame.

[0006] An object of the present invention is to provide a filter casing that is easy to maintain and can quickly discharge or remove oil mist that has accumulated in a filter that collects oil mist. [Means for solving the problem]

[0007] The invention of claim 1 of the present invention is "a filter casing having a filter mounting frame to which a filter that captures oil mist in the air can be detachably attached, the filter casing having a top plate, a pair of side plates, and a bottom plate, the bottom plate having an oil receiving surface, the filter mounting frame being positioned at an angle so that an upper side of the filter mounting frame approaches the upstream side of the air flow, when the filter that captures the oil mist is attached, the filter captures the oil mist, and the oil receiving surface receives the oil mist that has been captured by the filter and flows down due to gravity."

[0008] The invention of claim 2 of the present invention is "a filter casing as described in claim 1, wherein the oil receiving surface is configured to receive the oil mist that flows down from the filter due to gravity and to guide it toward the side of the filter casing."

[0009] The invention of claim 3 of the present invention is "a filter casing as described in claim 1 or 2, wherein the oil receiving surface is connected to an oil drain port for discharging oil mist, and the oil receiving surface is arranged at an incline downwardly toward the oil drain port."

[0010] The invention of claim 4 of the present invention is "a filter casing as described in any one of claims 1 to 3, wherein, in addition to the filter casing having an oil receiving surface, the filter mounting frame has an oil receiving surface along its lower edge, the oil receiving surface along the lower edge of the filter mounting frame and a gutter are connected, and the oil receiving surface along the lower edge of the filter mounting frame is arranged at an angle descending toward the gutter." Effect of the Invention

[0011] In the filter casing of the present invention, the filter mounting frame is arranged at an angle so that the upper side (upper edge) of the filter casing is closer to the upstream side of the airflow, so that when a filter that collects oil mist is attached to the filter casing, the filter that collects oil mist is inclined, and because the filter is inclined, the oil mist tends to move from the downstream side of the airflow of the filter to the upstream side of the airflow of the filter due to gravity, so the oil mist is less likely to accumulate on the downstream side of the airflow of the filter and is less likely to spray out from the downstream side of the airflow of the filter, resulting in excellent maintainability. The oil mist that accumulates in the filter that collects oil mist flows down to the bottom of the filter due to gravity, and the oil mist that flows down is received by the oil receiving surface of the filter casing on the underside of the filter (the bottom plate of the filter casing), and the oil mist collected by the filter can be easily removed, for example by discharging the oil mist from the oil receiving surface to the outside.

[0012] Furthermore, if the oil receiving surface is configured to guide the oil mist that flows down from the filter and is received toward the side of the filter casing, the oil mist can be discharged to the outside from near the side plate of the filter casing that is located toward the side of the filter casing, making it less likely for oil mist to accumulate on the bottom plate (oil receiving surface) of the filter casing, and oil mist that accumulates in the filter that collects the oil mist can be quickly removed, for example by discharging it outside the filter casing.

[0013] Furthermore, if the oil receiving surface that constitutes the filter casing is connected to an oil drain port that discharges oil mist and the oil receiving surface is arranged at an incline downwards toward the oil drain port, the oil mist that has accumulated on the oil receiving surface can be efficiently discharged and removed from the filter casing through the oil drain port, which is preferable.

[0014] Furthermore, in addition to the filter casing having an oil receiving surface, the filter mounting frame has an oil receiving surface along its lower edge, and the oil receiving surface along the lower edge of the filter mounting frame is connected to a gutter, and the oil receiving surface along the lower edge of the filter mounting frame is arranged at a slope descending toward the gutter, which is preferable as it can efficiently collect the oil mist that falls from the filter and can also efficiently collect the oil mist on the oil receiving surface of the filter casing and remove it, for example by discharging the oil mist outside the filter casing. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the filter casing of the present invention with a filter attached thereto, as viewed from the upstream side (front side) and right side of the air flow. [Diagram 2] FIG. 2 is a perspective view of the filter casing of the present invention with a filter attached thereto, as viewed from the upstream side (front side) and left side of the air flow. [Diagram 3] FIG. 2 is a right side view of a filter casing having a door on a right side panel of the present invention. [Figure 4] FIG. 2 is a right side view of the filter casing of the present invention having a door on a right side panel and with a filter attached to the filter casing with the door open. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, preferred embodiments of the filter casing of the present invention will be described with reference to the drawings. In the following description, specific conditions such as specific shapes and arrangements are illustrated to the extent that the present invention can be easily understood.

[0017] The filter casing (1) shown in Figs. 1 and 2 has a filter mounting frame (2) therein, and a filter (3) for collecting oil mist can be detachably attached to the filter mounting frame (2). The filter casing (1) has a top plate (1a), a pair of side plates (1b), and a bottom plate (1f), and the bottom plate (1f) has an oil receiving surface (1c). The oil receiving surface (1c) receives the oil mist that is collected by the filter (3) and falls from the filter (3) due to gravity. This oil receiving surface (1c) allows the oil mist to be removed, for example, by discharging it to the outside, so that the oil mist can be easily discharged from the filter (3). In Figs. 1 and 2, the side (upper side) of the bottom plate (1f) having the filter mounting frame (2) is the oil receiving surface (1c).

[0018] In addition, examples of methods for removing the oil mist from the oil receiving surface (1c), such as discharging the oil mist to the outside, include a method in which the oil receiving surface (1c) guides the oil mist toward one or both sides of the filter casing (1) and discharges it from the vicinity of a side plate in the side direction through an oil drain port (1d) connected to the oil receiving surface (1c) or a hole provided in the oil receiving surface (1c); a method in which the oil mist is guided to the center of the oil receiving surface (1c) and discharged from the center through an oil drain port (1d) connected to the oil receiving surface (1c) or a hole provided in the oil receiving surface (1c); a method in which the oil receiving surface (1c) is removed from the filter casing (1) and the oil receiving surface (1c) is washed to remove the oil mist accumulated on the oil receiving surface (1c); and a method in which an oil mist absorbing sheet is provided on the oil receiving surface (1c), the oil mist is absorbed by the oil mist absorbing sheet, and the oil mist is removed by discarding the sheet that has absorbed the oil mist. In the present invention, the term "side direction" refers to a direction toward either of the side plates (1b) of the filter casing (1).

[0019] When the oil mist is guided toward one side surface of the filter casing (1) by the oil receiving surface (1c) to be removed, such as by discharging the oil mist to the outside, it is preferable that the oil receiving surface (1c) is disposed so as to be inclined downward toward one side surface of the filter casing (1) as shown in Figures 1 and 2 so that the oil mist that has flowed down from the filter (3) can be efficiently guided toward one side surface of the filter casing (1). Note that in Figures 1 and 2, the oil receiving surface (1c) is disposed so as to be inclined downward toward the side surface toward the right side plate (1b) as viewed from the upstream side of the air flow of the filter casing (1).

[0020] In addition, when removing oil mist, such as by guiding the oil mist toward both side surfaces of the filter casing (1) through the oil receiving surface (1c) and discharging the oil mist from the oil receiving surface to the outside, it is preferable that the oil receiving surface (1c) is arranged at an incline downwards toward both side surfaces of the filter casing (1) so that the oil mist that has flowed down from the filter (3) can be efficiently guided toward both side surfaces of the filter casing (1).

[0021] Furthermore, when the oil mist is guided by the oil receiving surface (1c) to the center of the oil receiving surface (1c) and then removed, for example, by discharging the oil mist to the outside from the center of the oil receiving surface (1c), it is preferable that the oil receiving surface (1c) is arranged at an incline downwards toward the center so that the oil mist that has flowed down from the filter (3) can be efficiently guided to the center of the oil receiving surface (1c).

[0022] Furthermore, since the oil mist that has flowed down can be more efficiently removed, such as by being discharged to the outside of the filter casing (1), it is preferable that the oil receiving surface (1c) and the oil drain port (1d) for discharging the oil mist are connected and that the oil receiving surface (1c) is disposed at an incline downward toward the oil drain port (1d) as shown in Fig. 1. Note that the connection point between the oil receiving surface (1c) and the oil drain port (1d) can be near the connection point between the oil receiving surface (1c) and one of the side plates (1b), for example, when the oil mist is discharged from the oil receiving surface (1c) to the outside by guiding the oil mist toward the side surface of the filter casing (1) using the oil receiving surface (1c).

[0023] Furthermore, the size of the oil receiving surface (1c) of the filter casing (1) may be the entire surface of the side of the bottom plate (1f) having the filter mounting frame (2) or only a part of the side of the bottom plate (1f) having the filter mounting frame (2). However, if the oil receiving surface (1c) is present on the entire surface of the side of the bottom plate (1f) of the filter casing (1) having the filter mounting frame (2) as shown in Figures 1 and 2, the oil receiving surface (1c) can receive the oil mist that has been captured by the filter (3) and flowed down without dropping it. In particular, the oil mist that has accumulated on the downstream side of the air flow of the filter (3) can be received by the oil receiving surface (1c). Furthermore, if the filter casing (1) and the hopper of the air conditioning duct are directly connected, the oil mist that has passed through the filter (3) and adhered to the hopper of the air conditioning duct can also be received by the oil receiving surface (1c) present on the entire surface of the bottom plate of the filter casing (1), and a larger amount of oil mist can be received without dropping it. This is preferable.

[0024] The bottom plate (1f) shown in Figures 1 and 2 is composed of a plate-shaped main body (1fa) having an oil receiving surface (1c) and a frame (1fb) that connects the bottom of a pair of side plates (1b) at two points, the upstream side and the downstream side of the air flow, and the main body (1fa) and the frame (1fb) are connected by a screw (1e). In Figures 1 and 2, the screw (1e) is composed of a male screw attached to the frame (1fb) of the bottom plate and a knob with a female thread that screws into the male screw, and the screw (1e) is provided at four points in total, two points on the upstream side of the air flow and two points on the downstream side of the air flow. The main body (1fa) of the bottom plate also has four recesses for fitting the male screw, two points on the upstream side of the air flow and two points on the downstream side of the air flow. The bottom plate body part (1fa) and the bottom plate frame part (1fb) can be connected by fitting the male screw on the bottom plate frame part (1fb) into the recess on the bottom plate body part (1fa) and tightening the female-threaded knob, and the bottom plate body part (1fa) can be removed from the filter casing (1) by loosening the female-threaded knob and shifting the male screw from the recess on the bottom plate body part (1fa). When connecting the bottom plate body part (1fa) and the bottom plate frame part (1fb), the type and shape of the screw (1e) and the connecting method are not particularly limited. Also, the bottom plate body part (1fa) and the bottom plate frame part (1fb) may be connected by a method other than the screw (1e) (such as a snap lock).

[0025] The filter mounting frame (2) constituting the filter casing (1) of the present invention is composed of an upper edge portion which is the uppermost portion of the filter mounting frame (2), a lower edge portion which is the lowermost portion of the filter mounting frame (2), and a pair of side edges which connect the ends of the upper edge portion and the lower edge portion of the filter mounting frame (2). The upper edge portion of the filter mounting frame (2) is fixed to the top plate (1a) of the filter casing (1), the lower edge portion of the filter mounting frame (2) is adjacent to the bottom plate (1f) of the filter casing (1), both ends of the lower edge portion of the filter mounting frame (2) are fixed to the side plate (1b) of the filter casing (1), and the side edges of the filter mounting frame (2) are fixed to the side plate (1b) of the filter casing (1).

[0026] The filter mounting frame (2) constituting the filter casing (1) of the present invention is arranged at an incline so that the upper side (upper edge) of the filter mounting frame (2) approaches the upstream side of the air flow. As a result, when a filter (3) for collecting oil mist is attached to the filter mounting frame (2), the filter (3) for collecting oil mist is inclined, and the distance that the oil mist passes through the filter (3) tends to be longer than when the filter (3) is upright in the vertical direction, and the oil mist tends to move due to gravity from the downstream side of the air flow of the filter (3) to the upstream side of the air flow of the filter (3), so that the oil mist is less likely to accumulate on the downstream side of the air flow of the filter (3) and is less likely to spray out from the downstream side of the air flow of the filter.

[0027] When the inclination angle of the filter mounting frame (2) is defined as the angle between a plane perpendicular to the top plate (1a) of the filter casing (1) and a plane passing through the upper and lower edges of the filter mounting frame (2), the inclination angle of the filter mounting frame (2) is not particularly limited, but is preferably 5 to 20°. If the inclination angle is less than 5°, the oil mist collected by the filter (3) is less likely to move from the downstream side of the air flow of the filter (3) to the upstream side of the air flow of the filter (3) due to gravity, and the oil mist is likely to accumulate on the downstream side of the air flow of the filter (3), and there is a risk that the oil mist will spray out from the filter (3) to the downstream side of the air flow. Also, if the inclination angle exceeds 20°, the depth dimension of the filter casing (1) becomes large, which may make installation difficult.

[0028] As a method for attaching and detaching the filter (3) to and from the filter mounting frame (2), for example, as shown in Figures 3 and 4, a method in which a door (4) constituting a part of the side panel (1b) on the right side of the filter casing (1) is opened and the filter (3) is slid sideways to be inserted or removed, or a method in which the filter (3) is fitted from the upstream or downstream side of the air flow of the filter casing (1) and then removed from the upstream or downstream side of the air flow, etc., can be used. As shown in Figures 1 and 2, it is preferable that the filter mounting frame (2) has a filter mounting rail (2a) at least on the lower edge of the filter mounting frame (2) because this makes it easier to slide the filter (3) when attaching and detaching it. In addition to the lower edge of the filter mounting frame (2), the filter mounting rail (2a) may be provided on the upper edge of the filter mounting frame (2) or between the upper and lower edges of the filter mounting frame (2) in order to stably mount the filter (3) to the filter mounting frame (2), and in the case of mounting two or more filters (3) in the vertical direction, the filter mounting rail (2a) may be provided in the middle of the upper and lower edges of the filter mounting frame (2), etc. In Figs. 1 and 2 of the present invention, the filter mounting rail (2a) supporting the upper filter (3) of the two rows of filters (3) in the vertical direction is provided at two locations, the upper edge (not shown) of the filter mounting frame and the middle between the upper and lower edges of the filter mounting frame, and the filter mounting rail (2a) supporting the lower filter (3) is provided at two locations, the middle between the upper and lower edges of the filter mounting frame (not shown) and the lower end of the filter mounting frame, for a total of four locations.

[0029] The number of filters (3) attached to the filter mounting frame (2) is not particularly limited, and may be one or more than one. For example, in Figures 1 and 2, a total of four filters (3) are attached to the filter mounting frame (2), two in the vertical direction and two in the horizontal direction perpendicular to the vertical direction.

[0030] As shown in Figures 1 and 2, it is preferable that the filter mounting frame (2) has an oil receiving surface (2b) associated with it so that the oil mist adhering to the filter (3) can be efficiently discharged to the outside. It is preferable that the oil receiving surface (2b) of the filter mounting frame (2) is provided at least along the lower edge of the filter mounting frame (2), but the filter mounting frame (2) may also have an oil receiving surface (2b) along the filter mounting rail (2a) provided at the middle of the upper and lower edges of the filter mounting frame (2). In Figures 1 and 2, the filter mounting frame (2) has two oil receiving surfaces: one that is provided along the lower edge of the filter mounting frame (2) and the other that is provided along the filter mounting rail (2a) near the middle of the upper and lower edges of the filter mounting frame (2).

[0031] Furthermore, when the filter mounting frame (2) of the present invention has an oil receiving surface (2b), it is preferable that the oil receiving surface (2b) of the filter mounting frame (2) is connected to the gutter (2c) and that the oil receiving surface (2b) of the filter mounting frame (2) is disposed at an incline downward toward the gutter (2c) so that the oil mist that has flowed down can be efficiently discharged to the outside. The connecting location of the oil receiving surface (2b) of the filter mounting frame (2) to the gutter (2c) is not particularly limited as long as it can remove the oil mist from the filter casing (1), but it can be, for example, near the connecting portion of the oil receiving surface (2b) of the filter mounting frame (2) and one of the side plates (1b) or the center of the oil receiving surface (2b) of the filter mounting frame (2). In Figures 1 and 2, a gutter (2c) connects the oil receiving surface (2b) that is provided along the lower edge of the filter mounting frame (2) and the oil receiving surface (2b) that is located approximately halfway between the upper and lower edges of the filter mounting frame (2). Oil mist that accumulates on the oil receiving surface (2b) that is provided along the lower edge of the filter mounting frame (2) and the oil receiving surface (2b) that is located approximately halfway between the upper and lower edges of the filter mounting frame (2) is discharged via the gutter (2c) to the oil receiving surface (1c) of the filter casing (1).

[0032] The oil receiving surface (2b) of the filter mounting frame (2) may be located on the upstream side of the air flow of the filter mounting frame (2), on the downstream side of the air flow, or on both the upstream and downstream sides of the air flow. In Figs. 1 and 2, the oil receiving surface (2b) of the filter mounting frame (2) is located on both the upstream side and the downstream side of the air flow.

[0033] Furthermore, the shape of the oil receiving surface (2b) of the filter mounting frame (2) can be various, but as shown in Figures 1 and 2, if the oil receiving surface (2b) is tapered toward one end of the long side (the left side in Figures 1 and 2) and is inclined downward in the direction away from the filter mounting frame (2), the received oil mist can be quickly collected at the end of the long side of the oil receiving surface (2b) opposite the direction in which the oil receiving surface (2b) tapers (the right side in Figures 1 and 2), and for example, if a gutter (2c) is connected to the oil receiving surface (2b), the oil mist can be quickly discharged to the oil receiving surface (1c) of the filter casing (1) via the connected gutter (2c), which is preferable. Note that the "long side" here refers to the longest side of the oil receiving surface (2b).

[0034] Furthermore, as shown in Figures 1 and 2, the filter mounting frame (2) of the present invention may have support pillars (2d) in a direction parallel to the side edges of the filter mounting frame (2) in order to improve the strength of the filter mounting frame (2).

[0035] A door (4) may be provided on the side plate (1b) of the filter casing (1) of the present invention, as shown in Figures 1, 3 and 4, for the purpose of inserting and removing the filter (3). The door (4) constitutes a part of the right side plate (1b) of the filter casing (1) and is attached to the right side plate (1b) of the filter casing (1) by a hinge (5). A lock (6) holds the door (4) in a closed position.

[0036] The filter (3) of the present invention is not particularly limited as long as it can capture oil mist, and can be a nonwoven fabric, a woven fabric, a knitted fabric, or a porous membrane. The components of the filter (3) of the present invention are also not particularly limited as long as it can capture oil mist, and can be organic resins such as polyolefin, polyester, polyamide, etc., or inorganic components such as metal and glass. Furthermore, the filter (3) of the present invention may be a flat plate, or may be pleated in order to increase the surface area of ​​the filter and improve the efficiency of capturing oil mist.

[0037] The filter casing (1) of the present invention can be installed in the intake port of an exhaust duct or a dust collector, or in the middle of an exhaust duct or at the exhaust port, for use in environments where the air contains a lot of oil, such as kitchens and food processing plants where edible oils and fats are used in large amounts, and in factories where machine oil is used in large amounts.

[0038] The above describes preferred embodiments of the filter casing 1 of the present invention with reference to the drawings. The present invention is not limited to the specific exemplary conditions described above, and any suitable design changes or modifications can be made within the scope of the invention. [Explanation of symbols]

[0039] 1: Filter casing 1a: top plate, 1b: side plate, 1c: oil receiving surface, 1d: oil drain port, 1e: screw, 1f: bottom plate, 1fa: main body, 1fb: frame 2: Filter mounting frame 2a: filter mounting rail, 2b: oil receiving surface, 2c: gutter, 2d: support pillar 3: Filter 4: Door 5: Hinge 6: Lock

Claims

1. A filter casing having a filter mounting frame to which a filter for collecting oil mist in the air can be detachably attached, the filter mounting frame has an oil receiving surface along its lower edge on the upstream side of the air flow, the oil receiving surface along the lower edge of the filter mounting frame is connected to a gutter, the oil receiving surface along the lower edge of the filter mounting frame is arranged at an incline downwards toward the gutter, and the oil receiving surface of the filter mounting frame is tapered toward one end of a longer side of the oil receiving surface of the filter mounting frame, and the oil receiving surface of the filter mounting frame is inclined downwards in a direction away from the filter mounting frame, The filter casing has a top plate, a pair of side plates, and a bottom plate, the bottom plate having an oil receiving surface, The filter mounting frame is disposed at an incline such that an upper side of the filter mounting frame approaches an upstream side of the air flow, When a filter for collecting the oil mist is attached, the filter collects the oil mist, and an oil receiving surface of the filter casing receives the oil mist that is collected by the filter and flows down due to gravity.

2. 2. The filter casing according to claim 1, wherein the oil receiving surface of the filter casing is provided to receive oil mist that has flowed down from the filter due to gravity and to guide the oil mist toward a side surface of the filter casing.

3. 3. A filter casing as described in claim 1 or 2, wherein the oil receiving surface of the filter casing is connected to an oil drain port for discharging oil mist, and the oil receiving surface of the filter casing is inclined downwardly toward the oil drain port.

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