JPH0310478Y2 - - Google Patents

Description

[Detailed explanation of the idea] 〔Technical field〕 The present invention relates to a compressed air drain discharge device.

[Background technology]

Examples of this type of drain discharge device include those described in US Pat. No. 3,378,993, US Pat. No. 2,677,386, and US Pat. All of these systems use a float floating in the drain to detect when the amount of drain reaches a set value, and the float opens the drain valve via a lever, etc., and the drain is automatically discharged. It is becoming.

By the way, in such a drain discharge device, a small-diameter pilot orifice is opened by the minute buoyancy force exerted on the float by the drain, and air pressure is introduced to operate a piston or the like, thereby opening the drain valve. . and,
The greater the buoyancy of the float, the larger the pilot orifice can be, making it less likely that unstable operations such as clogging will occur. The buoyancy of this float is determined solely by the volume of the float. For this reason, in US Pat. No. 3,318,323, the float is made larger, and in US Pat. No. 3,378,993,
No. 267386 adopts a structure in which the buoyancy of the float is increased by a lever mechanism. Also,
The invention disclosed in Japanese Patent Publication No. 53-27490 employs a configuration in which the buoyancy of the float flips up the band-shaped movable piece to open the pilot orifice and open the drain valve.

However, such a conventional drain discharge device has a large float, and the lever mechanism and other drain valve opening structures are complicated. Furthermore, since the valve position of the float that seals the pilot orifice must be kept constant, the float cannot have more clearance than necessary with the main body. However,
Drainage from the pneumatic circuit becomes highly viscous due to the mixture of degraded oil and water with use, so this highly viscous drain accumulates in the above clearance, causing unstable float operation or holding the float. There was a problem. Furthermore, since the lever mechanism and other drain valve opening structures transmit the buoyancy of a minute float, there is a problem in that they are prone to failure.

[Purpose of invention]

The purpose of the present invention is to provide a compressed air drain discharge device that prevents the float from becoming unstable due to highly viscous drain and stabilizes the position of the valve relative to the pilot orifice. .

[Summary of the idea]

In this invention, a float is passed through the drain pipe main body through a predetermined clearance, and a rib is protruded from the outer periphery of the drain pipe main body to vertically guide a flexible plate attached to the float. , the above-mentioned clearance is made sufficiently large to prevent accumulation of highly viscous drain while allowing the float to move up and down stably.

〔Example〕

FIG. 1 is a longitudinal sectional view showing a compressed air drain discharge device which is an embodiment of the present invention. In the figure, 1 is a deep bowl-shaped container surrounded by a protective cover 1a.
A lid 3 having a port 2 for introducing compressed air is connected by a ring nut 4.

Reference numeral 5 denotes an element case screwed onto the lower part of the port 2 of the lid 3, and is adapted to introduce compressed air from the port 2 into the container 1 via a filter 6.

Further, a drain valve main body 8 is fitted into the opening 7 at the lower end of the container 1, and a drain pipe main body 9 is attached onto the drain valve main body 8. The lower part of this drain pipe main body 9 is a container part 9a,
The upper part of this container part 9a is a tubular part 9 having a smaller diameter.
It becomes b. The container portion 9a and the drain valve main body 8 have a drain hole 9 penetrating inside and outside.
c and 8a are provided, respectively. Reference numeral 10 denotes a piston that slides up and down within the container portion 9a, and a seal 11 is provided on the outer periphery of the piston 10 for sealing against the inner peripheral surface of the container portion 9a. This piston 10 also has a large-diameter upper container portion 10a, and a tubular portion 10b that communicates with the container portion 10a through a nozzle or hole. Spring 1
2, and a filter 13 held by this coil spring 12. Tubular part 10
A lip packing 14 serving as a drain valve is attached to the outer periphery of the lower end of the drain valve body 1.
It is in close contact with the valve hole 15 of No. 1 so as to close it.
A piping fitting 16 is screwed onto the lower end of the drain valve main body 8 via a washer 17.

On the other hand, a pilot orifice 18 is provided at the end of the tubular portion 9b of the drain pipe body 9, and the pilot orifice 18 is closed by the tip of a vane valve 19 made of a flexible elastic member. The other end of the vane valve 19 is held within a cap-shaped upper lid 20, and a support protrusion 21 protruding from the center of the upper lid 20 supports the tip of the vane valve 19 from above. The upper lid 20 has a flange-shaped attachment piece 20a at the lower end of the opening.

22 is a cylindrical float, and this float 22 is provided with a through hole 23 whose inner diameter gradually increases from the bottom to the top. Also, this float 22
A recess 24 is provided around the upper end of the through hole 23, and a plate 25 made of a flexible elastic plate and a mounting piece 20a of the upper lid 20 are stacked in the recess 24.
These are fixed to the float 22 by a retaining ring 26.

Further, the outer diameter of the tubular portion 9b gradually decreases from the bottom to the top, and the outer periphery thereof has a large clearance C with the inner periphery of the through hole 23 to improve drain discharge. Float 2 that stabilizes the operation of the tube body 9 and the float 22
2. A plurality of ribs 27 for guiding are provided to protrude in the vertical direction. FIG. 3 shows a structure in which four ribs 27 are provided. At the upper end of the cylindrical portion 9b, there is a stopper 9d (Fig. 2) that prevents the drain pipe main body 9 from coming off.
This stopper 9d comes into contact with the plate 25 to prevent the main body 9 from coming off. In addition, the inner circumferential portion of the plate 25 has a notched groove 25a (FIG. 3).
A plurality of movable pieces 25b are provided, and the portion sandwiched by these notch grooves 25a is relatively easily bent.
It is becoming.

Next, the operation of this embodiment will be explained.

When the drain 28 in the container 1 is at a low level, the float 22 is in the lowered position. Therefore, the vane valve 19 closes the pilot orifice 18 of the drain pipe main body 9. Further, the piston 10 rises against the repulsive force of the spring 12 due to the pressure acting inside the container 1, and
It is in contact with the upper inner wall surface of a.

However, when the drain 28 in the container 1 rises and exceeds a certain level, the float 22 begins to rise gradually due to its buoyancy, and finally the vane valve 19 integrated with the float 22 opens the pilot orifice 18. Therefore, compressed air entering the container 1 from the port 2 via the filter 6 enters the drain pipe main body 9 through the pilot orifice 18 and acts on the piston 10. Therefore, the piston 10 descends as shown in the right half of FIG.
It is rapidly released from the piping fitting 16 through c and 8a.

When the drain 28 is thus discharged, the float 22 is lowered and the vane valve 19 closes the pilot port 18. Therefore, the air in the container part 10a is gradually exhausted through the bleed orifice 10c connecting the container part 10a and the tubular part 10b and approaches atmospheric pressure, and the piston 10
2 and return to the original position shown in the left half of FIG. In this way, the discharge of the drain 28 in the container 1 is completed.

In such a draining operation of the drain 28,
The float 22 moves up and down along the drain pipe main body 9. This lifting and lowering is performed by moving the movable piece 25b of the plate 25 whose peripheral edge protrudes inward from the inner circumferential surface of the float 22.
This is done stably by being guided by the ribs 27 on the outer periphery of the tubular portion 9b, while the ribs 2
The inner circumferential surface of the float 22 and the tubular part 9 other than the part 7
A large clearance C remains between the outer periphery and b. Therefore, the floats 22 do not swing significantly with respect to the tubular portion 9b during their lifting and lowering operations, and even if highly viscous drain enters between the floats 22 and the ribs 27 of the tubular portion 9b, it will not move around the ribs 27. It moves to the vicinity of the outer periphery (clearance C) of the tubular portion 9b other than the above and flows down to the bottom of the container 1, so that it does not interfere with the smooth ascending and descending of the float 22.

The float 22 can be attached to the drain pipe main body 9 by simply inserting the float 22 holding the plate 25 from above the drain pipe main body 9 as described above, and at this time, the movable piece 25b of the plate 25 9b is pushed up by the stopper 9d on the outer periphery of the upper end, and is bent upward as shown in the left half side in FIG.
is restored as shown in the right half of FIG. Therefore, even if the float 22 is vibrated during transportation, the plate 25 will hit the stopper 9d and the float 22 will not come off. That is, when attaching the float 22, the movable piece 25b is bent as shown on the left half side in FIG. 2, and at this time the span is
L ₁ is sufficiently long, so movable piece 2 of stopper 9d
5b, but in the withdrawal direction of the float 22, the deflection span of the movable piece 25b is shortened to _L2 , so that the stopper 9d can be prevented from coming off from the movable piece 25b. Thus, this plate 25
This facilitates the installation of the float 22, prevents the float 22 from falling off due to vibration, etc., and smoothly guides the float 22 up and down relative to the drain pipe main body 9.

〔effect〕

According to the present invention, a float is passed through the drain pipe main body through a predetermined clearance, a flexible plate is attached to the float, and the flexible plate is attached to the outer periphery of the drain pipe main body and moves up and down together with the float. By providing multiple protruding ribs to guide the plate, sufficient clearance is provided between the drain pipe body and the float, which prevents highly viscous drain from remaining and solidifying between them. In addition, even though the above clearance is large, the plate moves up and down as if guided by the ribs, so the float moves up and down stably without swinging laterally more than necessary. This has the effect of reliably preventing positional deviation from occurring.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a drain discharge device which is an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view for explaining the operation of the main parts, and FIG. It is an enlarged sectional view taken along the A line. 9...Drain pipe body, 9d...Stopper, 18
... Pilot orifice, 19 ... Vane valve, 25 ... Plate, 27 ... Rib, 28 ...
Drain.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A float detects condensate generated in a pneumatic circuit, and the buoyancy of the float causes a vane valve to open a pilot orifice, and compressed air is used to forcibly discharge the condensate. The compressed air drain discharge device is characterized in that a flexible plate is attached to the float, and a plurality of ribs for guiding the plate are provided on the outer periphery of the drain pipe body having the pilot orifice. compressed air drain discharge device. (2) The compressed air according to claim 1 of the utility model registration claim, characterized in that a sufficient clearance is provided between the outer periphery of the drain pipe body excluding the ribs and the float to prevent drainage from remaining. Drain discharge device. (3) The compressed air drain discharge device according to claim 1 of the utility model registration claim, characterized in that the drain pipe main body has a stopper on the top thereof that engages with the plate to prevent the float from coming off. .