JPH04300610A - Mist collector - Google Patents

Abstract

PURPOSE:To solve the problem of clogging filter medium with the droplet adhering thereto, eliminate the labor to replace or clean a filter and permit the repeated use thereof to reduce the running cost in the filtering of harmful mists suspended in the air for separation and removal therefrom. CONSTITUTION:A group of disk-like filter elements 6 are arranged in a cylindrical casing 1 and driven rotationally by a motor 17 via a shaft 15. The droplet adhering to a filter medium 12 is separated forcibly therefrom by centrifugal force to return the filter elements 6 to the useable condition.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mist collecting device used mainly in factories, etc., for collecting harmful mist such as oil mist and acid mist floating in the air.

0002

[Prior Art] Methods for separating and removing harmful mist from air containing harmful mist (hereinafter simply referred to as contaminated air) include:
Known methods include a cleaning method that cleans contaminated air, a filtration method that uses filters placed in multiple stages to filter harmful mist, and a centrifugal separation method that separates harmful mist using the centrifugal force of rotationally driven filters. . For example, a filtration type device is known in Japanese Utility Model Application No. 63-1618, and a centrifugation type device is known in Japanese Utility Model Publication No. 58-11373. Note that the centrifugal separation method is often combined with the filtration method to form a device.

0003

[Problems to be Solved by the Invention] Cleaning systems are often configured as relatively large plant-based equipment, resulting in high installation costs and the need to separately process wastewater after cleaning. Such disadvantages cannot be avoided. In the filtration method, harmful mist adheres to the filtration body of the filter and aggregates, thereby separating the harmful mist. Therefore, clogging due to agglomerated droplets tends to occur at an early stage, and maintenance work such as cleaning and replacement takes a lot of effort. Furthermore, when a disposable filter is used, running costs are high and the filter must be disposed of separately after being replaced.

[0004] In the centrifugal separation method, the mist is aggregated on the surface of a rotatably driven filter or screen and then separated by centrifugal force, so that there is almost no clogging of the rotating filter. However, the efficiency of trapping harmful mists is lower than that of the above two methods, and in order to compensate for this, a filtration filter is provided at a later stage than the rotating filter to increase the degree of separation of harmful mists. Therefore, like the filtration method, this method requires a lot of effort to maintain the filtration filter, and when a disposable filter is used for filtration, the running cost is high.

[0005] The present invention eliminates clogging of filters caused by agglomerated droplets, thereby producing an economical noxious mist that can be operated without maintenance for a long period of time and reduces running costs. The goal is to obtain a collection device for

[0006]

[Means for Solving the Problems] In the mist collection device of the present invention, an inlet 3 and an outlet 4 are provided in a casing 1, and a space inside the casing 1 between the inlet 3 and the outlet 4 is provided with a mist collecting device. A filter 2 that captures harmful mist is arranged, and the air containing harmful mist is forcibly transferred from the inlet 3 to the outlet 4 by the blower 5. Assuming that the filter 2 is
Consisting of a group of disk-shaped filter elements 6 that divide the inside of the thing 1 into a plurality of compartments;
A sealing member 23 is provided in an annular shape between the periphery of each filter element 6 and the inner surface of the casing 1 to prevent ventilation between adjacent compartments. , the drive source 17 is configured to be rotatably driven along the annular plane of the seal member 23 via the shaft 15; It is required that a drain groove 24 for collecting the liquid be provided. More specifically, axis 1
5 are arranged vertically, and each filter element 6 is aligned with the axis 15.
It can be implemented in the form of vertically arranged multi-tiered structures along the Furthermore, each filter element 6 can be formed into a cone shape.

[0007]

[Operation] As mentioned above, the mist collection device of the present invention has the following features:
Basically, harmful mist is separated using a filtration method. Naturally, each filter element 6 will eventually clog the filter medium 12 due to the aggregated droplets. In order to eliminate this clogging and perform repeated filtration, a drive source 17 and a shaft 15 are provided so that a group of filter elements 6 can be driven to rotate by these. As the filter element 6 rotates, the droplets move radially outward due to centrifugal force, eventually fall into the drain groove 24 provided along the seal member 23, and flow down along the groove. Guided and collected. The reason why the sealing member 23 is provided between the periphery of each filter element 6 and the inner surface of the casing 1 is that when the harmful mist is separated, the contaminated air sent by the blower 5 is removed from the filter element 6. This is to prevent them from entering adjacent rooms from the periphery.

[0008]

[Effects of the Invention] The mist collection device of the present invention basically performs mist separation by a filtration method, and for this purpose,
Disc-shaped filter - Filter 2 with a group of elements 6
was constructed. If the filter element 6 becomes clogged with the aggregated droplets, the drive source 17 rotates the group of filter elements 6 through the shaft 15 to remove the droplets that adhere to the filter medium 12. The droplets were forcibly separated so that the filter element 6 could be used any number of times. Therefore, according to the mist collection device of the present invention, maintenance work such as filter replacement and filter cleaning, which was indispensable in conventional devices, can be significantly omitted, and the mist collection device can be used for a long period of time with almost no maintenance required. Collection can be performed. In addition, by separating the droplets adhering to the filter element 6, the filter element 6 can be repeatedly filtered.
Since the element 6 can be used, the running cost required for operating the mist collection device can be reduced, and this, coupled with the fact that maintenance work can be significantly omitted as described above,
This makes it possible to improve the economic efficiency of the mist collection device.

[0009]

Embodiments (Embodiment 1) FIGS. 1 to 3 show Embodiment 1 of a mist collecting device according to the present invention. In FIG. 1, the mist collection device houses a filter 2 inside a cylindrical casing 1, and an inlet 3 at the lower end of the peripheral wall of the casing 1.
An outlet 4 is provided protruding from one side of the upper end wall, and a centrifugal blower 5 is attached to the outlet 4, so that the apparatus is basically configured as a filtration type collection device.

The filter 2 consists of a group of five filter elements 6 arranged vertically in multiple stages, and these filter elements 6 divide the inside of the casing 1 into a plurality of chambers. Specifically, it is divided into an inlet chamber 7 communicating with the inlet 3, four separation chambers 8 divided between each filter element 6, and an outlet chamber 9 communicating with the outlet 4. The volumes of the inlet chamber 7 and the outlet chamber 9 are set to be sufficiently larger than that of the separation chamber 8.

As shown in FIGS. 2 and 3, the filter
The element 6 is formed into a disk shape by a hollow disc-shaped shape retaining frame 11, a fibrous filter medium 12 filled inside the shape retaining frame 11, and a boss 13 fixed at the center of the shape retaining frame 11. Fan-shaped ventilation windows 14 are opened at equal intervals in the circumferential direction on the upper and lower plate surfaces of the shape-retaining frame 11. The filter medium 12 may be a non-woven mat made by curling natural fibers or synthetic fibers and bonding them with a binding material, such as Saranrock (registered trademark) manufactured by Asahi Kasei Corporation, or glass wool. Wool, glass mat, or metal wool made of stainless steel, copper alloy, etc. can be used.

[0012] The above group of filter elements 6 are arranged in a case.
For support within the casing 1, a shaft 15 is provided that runs vertically through the center of the casing 1, and the bosses 13 of the filter element 6 are fitted onto this shaft, and each boss 13 is fixed to the shaft 15. There is. The upper and lower ends of the shaft 15 are rotatably supported by bearings 16 provided on the upper and lower end walls of the casing 1, and when the shaft 15 rotates, the filter element 6 rotates within the casing 1 in a horizontal position. can. In order to rotationally drive the group of filter elements 6 via the shaft 15, a motor (drive source) 17 is provided at the lower end of the peripheral wall of the casing 1, as shown in FIG. are interlockably connected by a belt 19 and a pair of pulleys 20, 21.

A seal member 23 is provided between the periphery of each filter element 6 and the inner surface of the casing 1 to prevent ventilation between adjacent compartments 7, 8, and 9, and a gutter-shaped seal member 23 is provided along the seal member 23. A drain groove 24 is provided. As shown in FIG. 3, the sealing member 23 consists of a rubber sealing ring 25 fixed to the periphery of the shape-retaining frame 11 and an annular sealing wall 26 extending from the inner surface of the casing 1. When 6 is at rest, the seal ring 25 is in close contact with the seal wall 26 to prevent ventilation. The seal ring 25 is made of different materials depending on the type of mist to be separated. For example, oil-resistant rubber, acid-resistant rubber, etc.

[0014] The drain groove 24 is continuous with the seal wall 26 and is provided in a circumferential manner inside the seal wall 26, with the oil drain port 27 provided in a part thereof being at the inclined lower end, and the entire drain groove 24 being slightly inclined. Yes (see Figure 1). The oil drain port 27 is led out to the outer surface of the casing 1 and connected to a collection passage 28, and communicates with a drain tank (not shown) via the collection passage 28.

[0015] The mist collection device configured as above has the following features:
The blower 5 is activated to draw contaminated air through the inlet 3, filter it through the filter element 6, and then discharge it to the atmosphere through the outlet 4 and the fan casing. At this time,
The motor 17 is stopped and each filter element 6
is stationary

[0016] If the operating time exceeds a certain value, or if a sensor (for example, a differential pressure switch) detects that the mist concentration in the air discharged from the blower 5 has reached a certain value, the blower 5 will stop operating. After stopping, the motor 17 is started to rotate a group of filter elements 6 via the shaft 15. Then, the droplets adhering to the gaps in the filter medium 12 are moved radially outward along the filter medium 12 under the influence of centrifugal force, and are splashed away from the peripheral opening of the shape retaining frame 11 in the tangential direction. Then, the oil collides with the seal wall 26 and flows down, is guided to the drain groove 24, and is discharged from the oil drain port 27. At this time, as shown by the imaginary line in FIG. 3, the seal ring 25 separates from the seal wall 26 due to centrifugal force, but when the motor 17 is stopped, it comes into close contact with the seal wall 26 again.

As described above, by rotating the filter element 6, droplets attached to the filter medium 12 are reliably removed. Therefore, the need for replacing the filter 2 or removing droplets is extremely reduced, and the filter element 6 can be used repeatedly.

(Embodiment 2) FIG. 4 shows Embodiment 2 of the mist collecting device according to the present invention, in which the filter structure is changed. In this embodiment, each filter element 6 is formed into a cone shape with a slanted lower edge to increase its cross-sectional area and to separate droplets by gravity. In other words, the filter structure was such that clogging caused by droplets is less likely to occur than in Example 1. Since the rest is the same as in Example 1, the same members are given the same reference numerals and their explanations will be omitted. In FIG. 4, the seal member is not shown.

In addition to the above, the present invention can also be implemented in the following modifications. The casing 1 and the shaft 15 are arranged horizontally, and along the shaft 15 a group of filter elements 6 are provided at regular intervals. In other words, when the first embodiment is of vertical type, the entire structure is of horizontal type. However, in this case, the drain groove 24 is formed to have a C-shaped or U-shaped cross section, and the entire groove is formed in an annular shape with the groove opening facing the shaft 15 side.

The filter element 6 only needs to have a disk-like outer shape as a whole, and the disk surface does not need to be flat. For example, the cross-sectional shape of the board surface may be formed into a continuous wave shape in the circumferential direction or the radial direction. Each filter element 6 has a filter medium 1 with different types and separation performance.
2 may be formed. For example, each filter element 6 is formed using a filter medium in which the pore diameter is larger as it approaches the inlet 3 and the pore diameter becomes smaller as the distance from the inlet increases. Filter medium 1
In addition to fibrous materials, 2 can also be applied as a single layer or laminated with a fibrous material, such as a screen material such as a wire mesh or punched metal, or depending on the type of mist, a plastic foam or nonwoven fabric.

The blower 5 may be provided on the inlet 3 side, or may be provided on both the inlet 3 and the outlet 4. As the drive source 17, an air motor, a hydraulic motor, etc. can also be used. Further, the belt transmission speed reduction (or speed increase) device described in the first embodiment is not necessarily required, and the motor 17 may be directly connected to the shaft 15.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a schematic structure of a mist collection device.

FIG. 2 is a sectional view taken along line AA in FIG. 1.

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a longitudinal sectional view equivalent to FIG. 1 with a modified filter structure.

[Explanation of symbols]

1...Casing, 2...Filter, 3...Inlet, 4...Outlet, 6...Filter element, 1
5...Shaft, 17...Drive source, 23...Seal member, 24...Drain groove.

Claims (3)

[Claims] [Claim 1] A casing 1 is provided with an inlet 3 and an outlet 4, and a filter 2 for trapping harmful mist is arranged in a space inside the casing 1 between the inlet 3 and the outlet 4. The air containing harmful mist is passed from inlet 3 to outlet 4 by a blower.
The filter 2 is composed of a group of filter elements 6 formed in a disc shape that divides the inside of the casing 1 into a plurality of chambers. A sealing member 23 is provided in an annular shape between the periphery of each filter element 6 and the inner surface of the casing 1 to prevent ventilation between adjacent compartments.
A group of filter elements 6 are connected to a shaft 15 by a drive source 17.
A drain groove 24 is configured to be rotatably driven along the annular plane of the seal member 23 through the seal member 23, and a drain groove 24 for collecting the separated liquid separated from the filter element 6 is provided along the seal member 23. A mist collection device is provided. 2. The mist collection device according to claim 1, wherein the shaft 15 is arranged vertically, and the filter elements 6 are arranged in multiple stages vertically along the shaft 15. 3. The mist collection device according to claim 1 or 2, wherein each filter element 6 is formed in a cone shape.