JPH0312337Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a pneumatic filter having an automatic drainage device disposed within the bowl.

Prior art and its problems If the air used in pneumatic equipment such as solenoid valves and cylinders contains a lot of dirt and moisture,
This will impair the reliability and lifespan of such equipment. Therefore,
A pneumatic filter is used to clean the air beforehand. In this type of pneumatic filter, water and the like accumulate in the bowl, which must be drained. For this reason, pneumatic filters have
A drainage mechanism or automatic drainage device is attached to drain the water accumulated in the bowl manually or automatically.

When using an automatic drainage device for a pneumatic filter, there are known types that are placed inside the bowl and types that are placed outside the bowl. However, although the former method is advantageous in terms of space saving, etc., there is a possibility that the automatic drainage device may malfunction because dirt from the primary side directly enters the device. This is because the automatic drainage device uses the buoyancy of the float, so dirt blocks the small hole that opens the float. In addition, since the latter traps dust at the nipple part at the bottom of the bowl, malfunctions caused by dust are less likely to occur, but since it is placed under the bowl, the pneumatic filter extends vertically and takes up more space. There were other problems.

Means for Solving the Problems The present invention solves the above-mentioned conventional problems by providing a mounting shaft provided within the bowl and above the automatic drainage device, and a mounting shaft that can be attached to and removed from below the mounting shaft. a filter member to which the filter member is attached, the filter member having a base formed with a hole into which the attachment shaft is fitted, and an outer frame formed to have a diameter slightly larger than the diameter of the inner circumference of the bowl at the attachment position. and,
Several beams connecting the base and the outer frame, the outer periphery of the base,
It consists of an inner periphery of an outer frame and a filter part provided in a space partitioned by a beam part, and the base part, the outer frame, the beam part, and the filter part are made by integrally molding a soft resin. This was achieved by forming a stop portion with a diameter slightly larger than the diameter of the hole in the base portion at the bottom of the mounting shaft.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a pneumatic filter having a main body 2 and a bowl 3 removably attached to the main body 2 and having a circular cross section. port 4,
It is equipped with an OUT port 5, a deflector 6, a buttful plate 7, and an element 8. Furthermore, an automatic drainage device 9 is arranged within the bowl 3. This pneumatic filter 1 converts air pressure entering from an IN port 4 into a swirling flow using a deflector 6, and moisture, dust, etc. in the air are centrifugally separated, travel along the inner wall of a bowl 3, and accumulate at the bottom thereof. Light dust that cannot be screened out by this centrifugation is filtered by element 8, and air from which dust and moisture have been sufficiently removed flows out to OUT port 5. Note that the buffer plate 7 serves to prevent the drain collected in the bowl 3 from being mixed into the air again. Further, the drain accumulated in the bowl 3 is automatically drained to the outside by an automatic draining device 9.

The pneumatic filter 1 having such a structure is almost the same as the conventional one, and as previously explained, there is a risk that the automatic drainage device 9 provided in the bowl 3 may malfunction due to dust.

Therefore, the pneumatic filter according to the present invention takes the following measures.

A mounting shaft 10 is formed above the automatic drainage device 9 at the center of the lower part of the full plate 7, and a stop portion 10a formed at the lower end of the mounting shaft 10 has a slightly larger diameter than other parts. is provided. A filter member 1 is attached to this mounting shaft 10.
1 is removably attached.

As shown in FIG. 2, the filter member 11 includes a base 13 in which a hole 12 into which the mounting shaft 10 is fitted is formed in the center, an outer frame 14 having a slightly larger diameter than the inner diameter of the bowl 3, and the base 13. In this example, four beam parts 15 are connected to the outer frame 14, and a filter part 16 is provided in a space partitioned by the outer periphery of the base 13, the inner periphery of the outer frame 14, and the beam parts 15. The filter portion 16 is formed in a mesh shape.

The filter member 11 thus constructed is made by integrally molding a soft resin, and each part is elastically deformable. Then, the hole 1
The diameter of the outer frame 14 is approximately the same as the diameter of the mounting shaft 10, and therefore smaller than the stop portion 10a, and the outer frame 14 has a circular cross-sectional shape.

The filter member 11 thus provided is fitted into the hole 12 into the mounting shaft 10 of the pneumatic filter 1 with the bowl 3 removed. At this time, the mounting shaft 1
Although the diameter of the stopper part 10a of 0 is slightly larger than the diameter of the hole 12, since the filter member 11 is made of soft resin, the hole 12 is temporarily closed by the insertion force.
expands and fits onto the mounting shaft 10. Thus, once the filter member 11 is attached to the attachment shaft 10, the stop portion 10a prevents the filter member 11 from easily coming off the attachment shaft 10.

Next, when the bowl 3 is attached to the main body 2, since the outer diameter of the outer frame 14 of the filter member 11 is larger than the inner diameter of the bowl 3, the filter member 11 is compressed from the outer periphery toward the center. As a result, the outer frame 14
is securely pressed against the inner periphery of the bowl 3, and
The filter portion 16 becomes slack as shown in FIG. 1, and this slack portion becomes a place where dust accumulates. Also, due to the pressure contact between the circular outer frame 14 and the bowl 3, the filter member 11
is elastically sealed to bowl 3,
Dust can be reliably captured by the filter member 11.

In this way, the pneumatic filter 1 of the present invention allows the filter member 11 to be easily attached, and even when it is removed for cleaning etc., the above operation can be performed in reverse.

Effects The pneumatic filter according to the present invention saves space because the automatic drainage device is placed inside the bowl, and since the filter member is removably attached, the automatic drainage device does not malfunction due to dirt. I no longer have to worry about waking up.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pneumatic filter according to the present invention, and FIG. 2 is a plan view of a filter member attached to the pneumatic filter. 1...Pneumatic filter, 3...Bowl, 9...
...Automatic drainage device, 10...Mounting shaft, 10a...
stop member, 11... filter member, 12... hole,
13...Base, 14...Outer frame, 15...Beam, 1
6...Filter section.

Claims (1)

[Scope of utility model registration request] A pneumatic filter in which an automatic drainage device is disposed in a bowl includes a mounting shaft provided in the bowl and above the automatic drainage device, and a filter member detachably mounted to the mounting shaft from below. The filter member has a base in which a hole is formed into which the mounting shaft is fitted, an outer frame formed to have a diameter slightly larger than the diameter of the inner circumference of the bowl at the mounting position, and the base and the outer frame. and a filter section provided in a space partitioned by the outer periphery of the base, the inner periphery of the outer frame, and the beam sections, and the base, the outer frame, the beam sections, and the filter section. A pneumatic filter, characterized in that the part is made by integrally molding a soft resin, and a stop part having a diameter slightly larger than the diameter of the hole in the base part is formed at the lower part of the mounting shaft.