JPS6349529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the mounting structure of a dust collecting filter.

A structure shown in FIG. 3 is known as a structure for mounting a filter in a housing. That is, as shown in FIG. 3A, the upper edge 4 of the retainer 3 is attached to the flange 2 of the through hole of the housing 1, and the filter cloth 5 covering the retainer 3 is tightened with a band 6 at its upper end. As shown in b,
A support plate 8 supporting the lower surface of the cylindrical filter 7 and a bracket 11 provided in the through hole are connected with a hook bolt 9, and by tightening a nut 14, the filter 7 is crimped to the housing via the gasket 13. Alternatively, as shown in FIG. 2C, a V-shaped gasket 17 is provided on the lower surface of the outer periphery of the upper end flange 16 of the filter 15, and the V-shaped gasket 17 is pressed against the housing 1 by the weight of the filter 15. In any of these mounting structures, when the filter is replaced, there is a risk that dust adhering to the filter surface may be scattered outside, which is particularly dangerous when handling hazardous substances. Another disadvantage is that the replacement work is extremely time consuming.

This invention was made to eliminate these conventional drawbacks, and provides a structure that can reliably prevent dust from scattering and also allows for easy filter replacement. be. That is, in the present invention, a through hole is formed in the upper wall of the housing, and a flange is formed on the periphery of the through hole. An O-ring is disposed, and a recess is formed above the O-ring, and a cylindrical guide through which the filter passes and filter fixing means are disposed on the flange, and the filter fixing means includes a first lever and a first lever. It has two levers and a spring, the tip of the first lever is fitted into the recess of the filter,
The tip of the second lever is biased by a spring so as to protrude into the guide, and by lowering the filter from above through the guide, the second lever is pushed by the filter and the first lever is retreated from the recess. The top edge of the filter is located on the inner surface of the flange, so that the tip of the first lever fits into the recess in the top edge of the filter.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a partition plate 1 divides a housing (not shown) into upper and lower parts, and has a lower chamber 30 and an upper chamber 40.
A flange 20 is formed on the periphery of the through hole that communicates with the
1 is formed. A filter 50 is fitted into the flange 20, and the filter 50 is connected to the filter section 5.
A holding part 51 is provided at the upper end of the holding part 5, and an O-ring 52 is attached to the outer periphery of the holding part 51, and a recessed part 53 is formed above the O-ring 52. A guide 60 that forms the same surface as the inner peripheral surface of the flange 20 is attached to the upper end of the flange 20, and the guide 60 has a large number of holes 61 throughout.
is formed, and its upper end opens into the upper chamber 40. Further, the guide 60 is provided with a bracket 80, to which a fixing means 70 is rotatably attached around a pin 81. Fixing means 70
, a first lever 71 and a second lever 72 are integrally constructed, and a locking portion 73 is provided at the tip of the first lever 71. First lever 71
A tension spring 77 is attached between the lever and the guide 60, so that the tip of the second lever 72 protrudes into the guide 60, and the first lever 71
A locking portion 73 forming the tip of the recess 53 is biased to fit into the recess 53 .

In this configuration, during operation of the filtration device, as shown by the solid line in FIG. Fixed.
The dust-containing air supplied into the lower chamber 30 passes through the filtration section 55 to become normal air and is sent into the upper chamber 40. To replace the filter 50, follow the steps shown in FIG.
That is, first, as shown in A, a new filter 5 is installed.
0 is inserted from above and lowered, the filter 50 pushes the tip of the second lever 72 and rotates the second lever 72 and the first lever 71 around the pin 81 as shown in FIG. As a result, the locking portion 7
3 is disengaged from the recess 53 and falls downward. When the filter 50 is further lowered, the locking part 73 no longer comes into contact with the filter 50, as shown in C, so that the locking part 73 is pressed against the outer peripheral surface of the holding part 51 by the tension spring 77, and then As shown in D, the locking part 73 is fitted into the recess 53, and the filter 50 is fixed. In this way, the filter 50 can be replaced extremely easily since it is only necessary to lower the new filter 50 from above.
Since the old filter passes only through the lower chamber 30, it can reliably prevent dust from scattering to the outside.

As explained above, the present invention allows a filter to be replaced by simply pushing in a new filter, which is easy to operate and can reliably prevent dust from scattering.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIGS. 2A to 2D are explanatory views showing the filter replacement process, and FIGS. 3A to 3C are sectional views of a conventional example. 1... Partition plate, 30... Lower chamber, 40... Upper chamber, 50...
Filter, 71...first lever, 72...second lever.

Claims (1)

[Claims] 1. A through hole is formed in the upper wall of the housing, and a flange is formed on the periphery of the hole, and the filter that passes through the through hole is cylindrical and open at the top.
An O-ring is disposed on the outer periphery of its upper edge, and a recess is formed above the O-ring, and a cylindrical guide through which the filter passes and filter fixing means are disposed on the flange. has a first lever, a second lever, and a spring, the tip of the first lever is fitted into the recess of the filter, and the tip of the second lever is biased by the spring so as to protrude into the guide. By lowering the filter from above through the guide, the filter pushes the second lever and retreats the first lever from the recess, and then the upper edge of the filter is located on the inner surface of the flange, so that the tip of the first lever A mounting structure for a dust collecting filter, characterized in that the dust collecting filter is configured to fit into a recessed portion on the upper edge of the filter.