JP2624587B2 - Drain discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a float valve mechanism attached to the bottom of a drain container, and a filter that separates an inlet at the top of the drain container and the inside of the drain container from each other with a filter. The present invention relates to a drain discharge device that opens and closes a drain discharge port by a vertical displacement of a float that rises and falls in response.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional float type drain discharge device which automatically discharges a drain removed from high-pressure air supplied to a pneumatic device every time a substantially constant amount is accumulated.

A cap 3 is attached to the upper opening of the drain container 2 in the guard cover 1, and the drain removed from the high-pressure air is introduced into the drain container 2 from the inlet 3 a of the cap 3. A filter 4 is interposed in the upper opening of the drain container 2, and the drain container 2
The inside is partitioned by the filter 4 from the inlet 3a.

[0004] A float valve mechanism 5 is attached to the bottom of the drain container 2. A drain pipe 6 constituting the float valve mechanism 5 is penetratingly mounted on the bottom of the drain container 2, and a pilot cylinder 7 is fixed to an outer periphery of an inner end of the drain pipe 6. An elevating body 8 is slidably accommodated in the inner circumference of the inner end of the drain pipe 6 and the inner circumference of the large-diameter portion 7a of the pilot cylinder 7, so that the inside of the drain pipe 6 serving as a drain outlet rises and lowers. It is always closed by the body 8. A compression spring 9 is interposed between the elevating body 8 and the pilot cylinder 7. Inside the large diameter portion 7a of the pilot cylinder 7 and the drain pipe 6
The inside is communicated with the inside through an orifice 8a on the lifting body 8.

At the upper end of the small diameter portion 7b of the pilot cylinder 7, a cylindrical valve 10 is slidably housed.
The orifice 11 in b is opened and closed by the cylindrical valve 10. A float 12 is arranged on the outer periphery of the pilot cylinder 7, and a lever 13 attached to the float 12 penetrates the small diameter portion 7 b and is inserted into the cylindrical valve 10.

[0006] The float 12 rises by the drain accumulated in the drain container 2. When the rising position is lower than a specified value, the orifice 11 is closed by the cylindrical valve 10. When the rising position of the float 12 exceeds a specified value, the orifice 11 opens and high-pressure air flows into the small-diameter portion 7b.
The cross-sectional area of the orifice 8a is smaller than the cross-sectional area of the orifice 11.
The inside of b becomes high pressure. The elevating body 8 is pushed down by the high pressure and the spring action of the compression spring 9, and the blockage in the drain pipe 6 is released. Therefore, the drain in the drain container 2 is discharged into the drain pipe 6 from the passage 7 c provided on the large diameter portion 7 a of the pilot cylinder 7. When the drain in the drain container 2 is drained, the elevating body 8 immediately closes the drain pipe 6, and no large air leakage occurs.

[0007] A manual cock 14 is attached to the cap 3 to break the blockage when the drain stays in the drain pipe connected to the inlet 3a. Open the manual cock 14 and open the cap 3.
If the inside is opened to the atmosphere, the closed drain in the drain pipe flows into the drain container 2 by high-pressure air.

[0008]

The drain blockage occurs not only in the drain pipe but also in the drain container 2. That is, the filter 4 may be clogged by the oil film and the water film, and the drain flowing into the drain container 2 may not drop to the float valve mechanism 5. In the case of such a drain blockage, the clogging of the filter 4 cannot be broken even by the opening operation of the pet cock 14, and the drain blockage cannot be eliminated.

[0009] In some cases, an electric on-off valve is used instead of the float valve mechanism. Opening this electrical on-off valve will forcibly drain the drain regardless of whether the drain is blocked. This opening / closing timing is performed using a timer. The setting of the opening / closing timing, that is, the setting of the drain discharge capacity is set in consideration of the amount of drain generated. However, in order to discharge the drain smoothly, the drain discharge capacity must be set to a relatively large value. In such a setting, even if there is no drain, the electric open / close valve is opened, and the amount of air discharged is increased.

The present invention is directed to a float type drain discharge device which is advantageous in terms of waste of air inherent in a drain discharge device using an electric opening / closing valve, and can be used for any one of a drain blockage in a drain pipe and a drain blockage in a drain container. It is an object of the present invention to provide a drain discharge device capable of overcoming the problem.

[0011]

According to the present invention, there is provided:
The inside of the drain container partitioned from the drain inlet by the filter was connected to the atmospheric region through a pressure relief passage, and an on-off valve was interposed on the pressure relief passage.

[0012]

When the on-off valve is opened, the inside of the drain container partitioned from the drain inlet by the filter communicates with the atmosphere via the pressure release passage, and the pressure on the float valve mechanism side with the filter becomes lower than the drain inlet side. . The pressure difference breaks the clogging on the filter, and both the clogging of the drain due to the clogging on the filter and the clogging of the drain in the drain pipe are eliminated.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. A cap 23 is attached to an upper opening of the drain container 22 in the guard cover 21, and the cap 23 has a pair of drain introduction ports 23 a, 2.
3b is provided. Drain inlets 23a, 23b
Are properly used depending on the piping configuration, and one of them is plugged. The drain removed from the high-pressure air is introduced into the drain container 22 from one drain inlet (23a or 23b).

A cylindrical filter 24 is interposed in the upper opening of the drain container 22, and a region 22a in the drain container 22 is introduced by the filter 24 into inlets 23a, 23a.
b.

A float valve mechanism 5 is attached to the bottom of the drain container 22. Since the float valve mechanism 5 has the same configuration as the float valve mechanism of FIG. 2, the same members are denoted by the same reference numerals and description thereof will be omitted. Filter 24
Has a bottom, and the bottom 24 a covers the entire upper surface of the float valve mechanism 5. Therefore, the filter 24
Drains through the float valve mechanism 5.

The cap 23 has a pair of pressure release passages 23c,
23d are formed. The pressure release passage 23c is located in the region 22a.
To the side surface of the cap 23, and the pressure release passage 23 d penetrates from the side surface to the upper surface of the cap 23. An electromagnetic on-off valve 25 is attached to a side surface of the cap 23. The solenoid on-off valve 25 is repeatedly demagnetized at time intervals set by a timer. The valve 25a always closes the pressure release passage 23d, and when the electromagnetic on-off valve 25 is excited, the pressure release passage 23d opens. That is, the solenoid on-off valve 2
5, the two pressure release passages 23c and 23d communicate with each other,
The region 22a communicates with the atmospheric pressure region.

When the filter 24 is clogged with an oil film, a water film, or the like, the drain flowing from the drain inlets 23a and 23b cannot pass through the filter 24 and does not reach the float valve mechanism 5. When the filter 24 is clogged, the region 22a is communicated with the atmospheric pressure by the excitation of the electromagnetic on-off valve 25, and the region 22a is connected to the drain inlets 23a, 23a.
The pressure becomes lower with respect to the 3b side. Due to this differential pressure, clogging of the filter 24 is eliminated and the drain inlet 23
The drain which is blocked on the sides a and 23b is the filter 2
4 and falls to the float valve mechanism 5 side.

Similarly, the drain retention blockage in the drain pipe is promptly resolved by lowering the pressure in the region 22a by exciting the solenoid on-off valve 25. Since the drain discharge in the drain container 22 is performed by the discharge action of the float valve mechanism 5, the air waste as in the conventional forced drain drain device in which an electric opening / closing valve is mounted at the position where the float valve mechanism is mounted. Does not occur.

The present invention is, of course, not limited to the above embodiment. For example, a sensor for detecting the pressure in the area 22a is mounted, and the electromagnetic on / off valve is demagnetized based on the detection information from the pressure sensor. You may do so.
Further, a manual cock may be used instead of the electromagnetic on-off valve.

[0020]

As described above in detail, according to the present invention, the inside of the drain container partitioned from the drain inlet by the filter is connected to the atmospheric region by the pressure relief passage, and the on-off valve is interposed on the pressure relief passage. When the on-off valve is opened in the drain container partitioned from the drain inlet by the filter, the drain communicates with the atmosphere through the pressure release passage, eliminating both drain blockage due to clogging on the filter and drain blockage in the drain pipe. An excellent effect is achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment embodying the present invention.

FIG. 2 is a conventional longitudinal sectional view.

[Explanation of symbols]

5: float valve mechanism, 22: drain container, 22a: region, 23a, 23b: drain inlet, 23c, 23d
... pressure release passage, 24 ... filter, 25 ... solenoid on-off valve.

Claims (1)

(57) [Claims] 1. A drain valve (22) having a float valve mechanism (5) attached to the bottom of a drain container (22).
The drain inlets (23a, 23b) at the top of the container and the inside of the drain container (22) are partitioned by a filter (24), and the float (12) that rises and falls according to the water level of the drain collected in the drain container (22) In a drain discharge device which opens and closes a drain outlet (6) by displacement, a drain inlet (23a, 23b) is provided by a filter (24).
(22) in the drain container (22) partitioned from the
a) is connected to the atmospheric region through the pressure release passages (23c, 23d), and the on-off valve (2) is placed on the pressure release passages (23c, 23d).
5) A drain discharge device, wherein the drain discharge device is interposed.