JPH10337417A - Liquid purification device and use method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a take-out work of liquid in a liquid purification device by operating a liquid pump until discharge of the liquid in a filter housing container is completed, opening a drain valve after a stop of the operation, discharging remaining liquid at the bottom, exchanging a filter element, closing a drain valve and a switching valve, and then returning to a normal operation. SOLUTION: In the case that an exchange or washing of the filter element 11 becomes necessary, the liquid in the filter housing container 12 is taken out. At this time, first a vent valve 16 and switching valves 51, 61 are opened and stop valves 41, 44 are interrupted. Later the pump 14 is operated and the liquid in the filter housing container 12 is fed to a secondary side piping 15. The liquid fed to the secondary side piping 15 is stopped a back flow to the container 12 with a back flow stop valve 20. The liquid higher than a level of the height of a connection part of the primary side piping 13 of the container 12 is taken out, and at this time a level in the container 12, the pressure of the secondary side piping 12 or the flow rate is detected to stop the pump 14, thus a damage due to a dry operation of the pump 14 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid cleaning apparatus for removing foreign substances such as lubricating oil and cleaning liquid which impair the performance of the liquid itself or foreign substances which have a detrimental effect on an object to which the liquid is applied. Regarding how to use it.

[0002]

2. Description of the Related Art A liquid cleaning device provided with a filter container is used for removing foreign matter in a lubricating oil such as hydraulic oil and gear oil, or for removing foreign matter in a liquid such as a washing liquid for a device, a machine or a steel plate. Can be This apparatus includes, for example, at least one filter storage container having an internal volume of 20 liters or more. This filter container has a vent valve at the top to release the air inside the container, and has a structure in which a plurality of parts are divided at an intermediate portion other than the uppermost portion of the container.

[0003] Fig. 3 shows an example of a liquid purifying apparatus 1 comprising such a filter storage container having primary and secondary pipes and a liquid sending pump for sending filtered liquid. This device 1 is provided with a drain valve 22 at the bottom of the filter storage container 12. When the filter element 11 is closed, the liquid inside the filter storage container 12 is discharged from the drain valve 22 to replace the filter element 11. I was
In this case, when the capacity of the filter storage container 12 is large, a large container for receiving the discharged liquid is required, and when the container is small, it is necessary to frequently carry the discharged liquid. In addition, when the liquid is returned to the liquid storage tank 30 by using another discharge pump (not shown), it takes time to prepare the pump and to prepare connection pipes and hoses. In addition, if the liquid inside the filter storage container 12 is discharged and discarded, the volume of the liquid is wasted, and the load of processing the discharged liquid increases. In general, such a liquid that needs to be cleaned is often expensive or requires a drainage treatment cost. In recent years, in order to extend the replacement cycle of the filter element 11, the number of the filter elements 11 is increased, and the capacity of the filter storage container 12 is often increased. It requires human intervention. In addition, 21 is a filter bypass path.

In another technique, as shown in FIG.
The drain valve 22 of the filter storage container 12 is connected to the secondary pipe 15 of the filter storage container 12, and the primary pipe 13 of the filter storage container 12 is provided with a compressed air inlet 17 so that the drain valve can be used when the liquid is extracted. There is also an apparatus having a structure in which the filter 22 is opened and the compressed air is introduced from the compressed air inlet 17 to discharge the liquid inside the filter housing 12. In this case, there is a problem that a compressed air device is required, and in this case, the outlet of the liquid return pipe 35 in the liquid storage tank 30 is usually immersed in the liquid for defoaming in the liquid storage tank 30. In many cases, depending on the amount of compressed air, air bubbles may be generated in the liquid storage tank 30 to interfere with other devices. In order to prevent this, frequent inspections are performed during liquid drainage. Need, and must be present for this. In addition, when the drain valve 22 is used, foreign matter having a high specific gravity or a different liquid precipitated in the filter storage container 12 is returned to the original liquid storage tank 30 at a time, so that the liquid is contaminated. Therefore, there is a problem that the possibility of occurrence of a failure due to is extremely high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and to save labor, prevent loss of liquid, and automate liquid extraction of the apparatus. It is an object of the present invention to provide an apparatus for cleaning a liquid and a method of using the same.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and relates to an industrially effective liquid cleaning apparatus and a method for using the same. The constitution is as follows. The liquid purifying apparatus of the present invention is a liquid purifying apparatus comprising: a filter storage container having primary and secondary pipes; and a liquid sending pump for sending filtered liquid to the container. The pipe line and the primary pipe of the filter storage container are connected by a first bypass pipe with a switching valve interposed therebetween, and the discharge pipe of the liquid feed pump and the secondary pipe of the filter storage container body or the filter storage container are connected to each other. Are connected by a second bypass line having a switching valve interposed therebetween, and a check valve is interposed in a secondary pipe of the filter storage container.
The first and second bypass pipes are for extracting liquid from the filter storage container using a liquid feed pump and sending the liquid to the liquid storage tank.

[0007] The first bypass pipe is mounted above the level of sediment accumulation in the filter container, so that the sediment in the filter container is not sucked and returned to the liquid storage tank. It is preferable to discharge the water from The method of using the device of the present invention is as follows. When replacing the filter in the filter storage container, the suction pipe and the primary pipe closing valve of the liquid feed pump are closed, the switching valves of the first and second bypass pipes are opened, and the vent valve of the filter storage vessel is opened. Open and stop the liquid feed pump until the liquid in the filter storage container is completely drained, open the drain valve of the filter storage container to discharge the remaining liquid at the bottom, open the filter storage container and remove the filter. After the replacement, the drain valve and the switching valve are closed, the shut-off valve is opened, the liquid supply pump is operated to fill the liquid into the filter storage container, and then the vent valve is closed to perform normal operation. This is a method of using the liquid cleaning device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The purifying apparatus 1 of the present invention is provided with a shut-off valve 44 in the discharge pipe 43 of the liquid feed pump on the inlet side of the purifying apparatus, and the suction pipe 42 of the pump 14 is provided between the shut-off valve 44 and the filter container 12.
Bypass line 50 that connects
It has. In addition, a second bypass pipe 60 is provided for connecting the pipe 43 between the pump 14 and the closing valve 44 of the primary pipe of the filter storage container 12 to the secondary pipe 15 of the filter storage container 12. A check valve 20 is provided on the filter storage container side from the connection of the second bypass pipe 60 with the secondary pipe 15 of the filter storage container 12.

When the filter element 11 is closed during use and the filter element 11 needs to be replaced or cleaned, when the liquid inside the filter container 12 is drained, the device of the present invention first uses a vent. Valve 16,
The switching valves 51 and 61 are opened, and the closing valves 41 and 44 are shut off. Then, by operating the pump 14,
The structure is such that the liquid inside the filter storage container 12 can be drained and sent to the secondary pipe. The liquid sent to the secondary pipe 15 of the filter container does not flow back to the filter container 12 by the check valve 20. In this manner, the liquid in the filter storage interior 12 that is higher than the connection part height level of the primary pipe 13 of the filter storage container 12 can be drained. The liquid draining time can be determined based on the predetermined discharge amount of the supply pump 14 and the internal volume of the filter storage container 12, and the liquid draining time can be easily estimated. If the pump is operated even after the drainage of the liquid in the filter container 12 is completed, the pump may be damaged. However, an automatic control device may be added to detect the level inside the container, or the bypass pipe may be used. Alternatively, the pump 14 can be stopped by detecting the pressure and the flow rate of the secondary pipe of the device.

FIG. 2 shows another embodiment of the present invention. Here, one end 52 of the first bypass pipe is connected to the main body of the filter storage container 12 instead of the primary pipe 13 of the filter storage container. Even with such connection, the same effect as that of the embodiment shown in FIG. 1 can be achieved. The structure of the valve does not need to be special, and may be any material that can be applied to general equipment and its liquid. A structure in which the filter element cannot be replaced unless the filter storage container 12 is divided due to its structure, particularly a lubricating oil purifying device used in a ship or the like has a structure in which the main body is divided into two to four parts. Since a differential pressure gauge or a pressure gauge that knows the state of blockage is provided, the same effect can be obtained by modifying the operation control circuit of an existing device instead of a completed device by adding replacement of these switches to a switch.

[0011]

According to the present invention, the operation of draining the liquid in the liquid cleaning apparatus is simplified, and special preparation for draining the liquid can be made unnecessary. In addition, dirty liquid, compressed air and the like at the bottom of the filter storage container are not returned to the tank.

Further, since the liquid draining completion time can be predicted, it is not necessary to witness until the liquid draining is completed, and it is only necessary to return to the expected completion time. During that time, other work can be performed. An improvement in efficiency can be achieved. Since the amount of the discharged liquid generated outside the system is a limited amount with a high degree of contamination at the bottom of the container, it has a great effect on the cost of discharging the discharged liquid and improvement of the environment surrounding the apparatus.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a lubricating oil cleaning device according to the present invention.

FIG. 2 is a diagram showing a configuration of a lubricating oil cleaning device according to the present invention.

FIG. 3 is a diagram showing a configuration of a conventional lubricating oil cleaning device.

FIG. 4 is a diagram showing a configuration of a conventional lubricating oil cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid cleaning apparatus 11 Filter element 12 Filter storage container 13 Primary piping 14 Pump 15 Secondary piping 16 Vent valve 17 Compressed air inlet 20 Check valve 21 Bypass path 22 Drain valve 30 Liquid storage tank 31 Liquid storage tank drain Valve 32 Pipe to liquid purifier 35 Return pipe 41 Shut-off valve 42 Suction pipe of liquid feed pump 43 Discharge pipe of liquid feed pump 44 Shut-off valve 50 First bypass pipe 51, 61 Switching valve 60 Second bypass pipe

Claims (3)

[Claims] 1. A liquid purifying apparatus comprising: a filter container having primary and secondary pipes; and a liquid pump for supplying a filtered liquid to the container. A first bypass pipe with a switching valve interposed between the primary pipe of the storage container and a switching valve for connecting the discharge pipe of the liquid sending pump to the secondary pipe of the filter storage container body or the filter storage container. Connected by an interposed second bypass line,
A liquid cleaning device, characterized in that a check valve is interposed in a secondary pipe of a filter storage container. 2. The cleaning apparatus according to claim 1, wherein the first bypass pipe is mounted on a vessel wall above a sediment accumulation level in the filter vessel. 3. When replacing the filter in the filter storage container, the suction pipe of the liquid feed pump and the primary side pipe closing valve are closed, and the switching valves of the first and second bypass pipes are opened to store the filter. Open the vent valve of the container, stop the liquid feed pump by operating until the liquid in the filter container is completely drained, open the drain valve of the filter container, discharge the residual liquid at the bottom, and open the filter container. After replacing the filter, the drain valve and the switching valve are closed, the shut-off valve is opened, the liquid supply pump is operated to fill the liquid into the filter container, and then the vent valve is closed for normal operation. A method for using a liquid cleaning apparatus, comprising: