JP2545567Y2 - Painting waste liquid recovery device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating waste liquid collecting apparatus. More specifically, the present invention relates to a coating waste liquid recovery apparatus used for collecting and reusing coating waste liquid generated by color change washing or coating machine washing in an automobile painting booth.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a schematic structure of a conventional coating waste liquid collecting apparatus.

For example, an automobile coating booth is generally provided with a coating waste liquid recovery device. In the conventional coating waste liquid collecting apparatus, the coating waste liquid discharged from the coating machine 7 to the tray 3 in the coating booth 2 at the time of color change cleaning or the like is collected in a collection tank 4 in the booth 1 by air suction, and then collected in the booth 1. In general, the thinner is sent to an outer collection tank 6 or the like, where the thinner is extracted and separated, sent to a preparation chamber for reuse, and the other is discharged to a waste liquid tank.

However, the above-mentioned waste liquid collecting apparatus requires two types of tanks, a collecting tank 4 and a collecting tank 6, so that the equipment becomes large and clogging of the pipe 5 between the tanks 4 and 6 is relatively difficult. It happens frequently and the renovation takes a considerable number of days.

In order to eliminate the above-mentioned disadvantages, the present applicant has installed an inner tank 11 for collecting a coating waste liquid inside an outer tank 12 and an inner tank 11 as shown in FIGS. Is a sealed type, and a coating waste liquid collecting apparatus in which a discharge pump 14 is assembled has been previously proposed.

More specifically, such a coating waste liquid collecting apparatus includes a collecting tank 10 including an inner tank 11 and an outer tank 12 and a collecting tank 10 having a lower portion than the bottom of the inner tank 11.
Lower outer tank 12 and outer tank 12
Also includes a discharge hose 13 communicating with a waste liquid storage section below (for example, a mixing room 8 downstairs), a discharge pump 14 provided in the middle of the discharge hose 13 and a check valve 15 opened by pump pressure. , The liquid level in the outer tank 12
Is located above the bottom of the inner tank 11.
It is configured so that the liquid surface of the outer tank 12 is below
Discharge pump 1 when the predetermined level is exceeded
4 is operated so as to collect and discharge the coating waste liquid into the waste liquid storage section (mixing chamber 8).

Here, the inner tank 11 is a cylindrical tank having a bottom opening 11a attached inside the outer tank 12. In addition, on the inner tank 11
The part is sealed. The inner tank 11, the dump hose 52 and one end of the color switching device 9 is connected
And / or a collection hose 53, one end of which is connected to the tray 3, is connected. The inner tank 11 is connected to a degassing means (not shown) through a degassing pipe 19, so that the pressure inside the tank 11 is reduced. Therefore, the coating waste liquid sent from the color switching device 9 and the tray 3 is collected in the inner tank 11 by the depressurizing action.

The outer tank 12 has a discharge port 12a disposed at a position lower than the bottom opening 11a of the inner tank 11, and a discharge hose 13 is connected to the discharge port 12a. Lower waste storage section
It is communicated with (8) .

The outer tank 12 is provided with a liquid level detecting device 21. The liquid level detecting device 21 is a float type liquid level detecting device.
23 and a detection sensor (magnetic sensor) not shown. In FIG. 5, h1 is the collection tank 10
In the figure, h2 indicates the lower limit of the height of the coating waste liquid. Liquid level control so that the liquid level of the coating waste liquid in the recovery tank 10 is at a predetermined level between the upper limit (h1) and the lower limit (h2) (the level of the detection target 23 of the liquid level detection device 21 is the same as the circulation position). Is done.

[0010] With this configuration, the conventional piping between tanks is not required, so that not only the device is reduced in size but also no clogging failure occurs.

[0011]

However, in the above-mentioned coating waste liquid collecting apparatus, the discharge hose 1 may be removed for some reason.
If the pressure downstream of the check valve 15 interposed position becomes negative, the coating waste liquid may be discharged from the outer tank 12 by the siphon effect without driving the discharge pump 14. When such a phenomenon occurs, the coating waste liquid collected in the inner tank 11 vigorously enters the outer tank 12 and blows up, and the upper part of the tank 12 has insufficient sealing (for example, the liquid level detecting device 21 and the outer surface). (The connection portion with the tank 12), and the surrounding area may be soiled.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a coating waste liquid collecting apparatus capable of preventing a coating waste liquid from leaking out of a collecting tank.

[0013]

Means for Solving the Problems] painting waste liquid recovery apparatus according to the present invention includes an inner tank bottom is opened with the dump hose and / or recovery hose there is contact <br/> connection is that of the upper is sealed , To accommodate this inner tank
A collection tank consisting of an outer tank provided with a liquid level detector and an outer tank lower than the bottom of the inner tank.
Waste tank below the outer tank and the outer tank
Wherein and a discharge hose communicating parts, and a check valve that opens by the discharge pump and the pump pressure provided in the middle of the drain hose, the lower limit of the liquid level in the outer tank in
So that it is located above the bottom of the
A coating waste liquid recovery formed such that when the liquid level in the outer tank reaches a predetermined level above the lower limit , the discharge pump is operated to collect and discharge the coating waste liquid into the waste liquid storage unit. An apparatus, wherein the inner tank and a portion of the discharge hose downstream of the check valve interposition position communicate with each other by a bypass hose, and a portion of the bypass hose downstream of the check valve interposition position of the discharge hose intersects with the inner tank. A valve device that opens when a negative pressure occurs is mounted.

[0014]

In the present invention having the above-described structure, when the discharge hose has a negative pressure on the downstream side of the check valve interposition position, the valve device opens the bypass hose, and the downstream side and the inner tank are connected to each other. It is communicated through a hose and has the same pressure. Therefore, the coating waste liquid collected in the inner tank does not vigorously enter the outer tank and blow up, and the coating waste liquid is prevented from leaking from a portion of the upper tank where sealing is insufficient. .

[0015]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention, and FIG. 2 is a diagram showing an entire configuration of a coating waste liquid collecting apparatus of the present invention. As shown in FIGS. 1 and 2, the coating waste liquid collecting apparatus according to the present embodiment includes a receiving tray 3, a collecting tank 10 (inner tank 11, outer tank 12), a discharge hose 13, a discharge pump 14, a check valve 15, and a main body. The apparatus includes a bypass hose 31 and a valve device 41 which are characteristic parts of the device. The same components as those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted or simplified.

Here, the bypass hose 31 is a means for communicating the inner tank 11 with a portion of the discharge hose 13 downstream of the check valve 15 interposed position.

The valve device 41 includes a bypass hose 31.
The check valve 15 of the discharge hose 13
The hose 13 is opened when the pressure downstream of the interposition position becomes negative. In the present embodiment, the valve device 41 includes a check valve 42 and a pressure regulating valve 43. This valve device 41 (pressure regulating valve 43)
Is configured to be pressure-controlled by the control device 45 so that high pressure is not applied to the discharge hose 13 side from the inner tank 11 side.

A check valve 16 is interposed at a portion of the discharge hose 13 downstream of the check valve 15 interposition position in order to more effectively prevent the backflow of the coating waste liquid.

Next, the operation will be described. Discharge hose 1
When the pressure downstream of the check valve 15 interposition position becomes negative, the bypass hose 31 is opened by the valve device 41, and the downstream side of the discharge hose 13 and the inner tank 11 are communicated through the bypass hose 31. It becomes the same pressure.

Therefore, the coating waste liquid collected in the inner tank 11 does not vigorously enter the outer tank 12 and blow up.
2. Leakage of the coating waste liquid is prevented from a part of the upper part where sealing is insufficient (for example, a connection part between the liquid level detecting device 21 and the upper part of the outer tank 12).

When the discharge pump 14 is operated and the coating waste liquid is sent to the lower preparation chamber 8 via the discharge hose 13, the bypass hose 31 is closed by the check valve 42 of the valve device 41. Therefore, it does not return to the inner tank 11.

Therefore, according to this embodiment, the inner tank 11 and the portion of the discharge hose 13 downstream of the check valve 15 are communicated with the bypass hose 31, and the reverse hose is connected to the middle of the bypass hose 31. When the pressure on the downstream side from the interposition position of the stop valve 15 becomes negative, the bypass hose 31
Is provided, the coating waste liquid collected in the inner tank 11 does not vigorously enter the outer tank 12 and blow up, and the coating waste liquid is discharged to the outside of the collection tank 10. Can be prevented from leaking.

Further, by the cooperation of the bypass hose 31 and the valve device 41, the pressure imbalance between the portion of the discharge hose 13 downstream of the check valve 15 and the inner tank 11 and the inner tank 11 is eliminated. The structure does not become complicated or large.

[0024]

According to the present invention, a bypass hose connects the inner tank to a portion of the discharge hose downstream of the check valve interposition position, and a portion of the bypass hose downstream from the check valve interposition position. Since the valve device that opens the bypass hose when the side becomes negative pressure is provided, the coating waste liquid collected in the inner tank does not enter the outer tank vigorously and blow up, The coating waste liquid can be prevented from leaking out of the recovery tank.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing an overall configuration of the present coating waste liquid collecting apparatus.

FIG. 3 is a diagram showing a schematic configuration of a conventional coating waste liquid collecting apparatus.

FIG. 4 is a diagram showing a schematic configuration of a coating waste liquid collecting apparatus having a collecting tank composed of an inner tank and an outer tank.

FIG. 5 is a view for explaining a recovery tank of the coating waste liquid recovery apparatus of FIG. 4;

[Explanation of symbols]

 Reference Signs List 10 Recovery tank 11 Inner tank 12 Outer tank 13 Discharge hose 14 Discharge pump 15 Check valve 21 Liquid level detecting device 31 Bypass hose 41 Valve device

Claims (1)

(57) [Scope of request for utility model registration] [Claim 1] dump hose and / or recovery hose
Are connected, the top is closed and the bottom is open.
An inner tanks, housing the inner tank
And a recovery tank consisting of an outer tank provided with a liquid level detection device and a lower part than the bottom of the inner tank.
Waste liquid below the outer tank and the outer tank
Including a discharge hose communicating with the storage section , a discharge pump provided in the middle of the discharge hose and a check valve opened by pump pressure, the lower limit of the liquid level in the outer tank is reduced.
Structured so that it is located above the bottom of the inner tank
When the liquid level in the outer tank reaches a predetermined level above the lower limit , the discharge pump is operated to store the waste liquid.
A coating waste liquid collecting device formed so as to collect and discharge the coating waste liquid in a portion , wherein a bypass hose communicates the inner tank with a portion downstream of a check valve interposition position of the discharge hose, and the bypass hose A coating device for discharging the coating waste liquid, which is provided with a valve device that opens when the pressure on the downstream side of the check valve intervening position of the discharge hose becomes negative in the middle of the discharge hose.