JPH05301008A - Device for washing filter - Google Patents

Abstract

PURPOSE:To provide a device for washing a filter where washing efficiency of the filter is increased and the dumped quantity of fluid required for washing is reduced. CONSTITUTION:A discharge tank 3 for storing soiled fluid 1 fed from a supply tank 2 is provided. The discharge tank 3 and the primary side of a filter unit 5 are connected by the 1st circulating path 7 having a pump 11 and the 1st switching valve 12. The secondary side of the filter unit 5 and the supply tank 2 are connected by the 2nd circulating path 8. The supply tank 2 and the secondary side of the filter unit 5 are connected by a back flow path 15 having the pump 11 and the 2nd switching valve 18. A dumping path 19 having the 3rd switching valve 21 is branched from between the primary side of the filter unit 5 and the 1st switching valve 12 and a stop valve 23 which is normally open and intermittently operable is installed in the 2nd circulating path 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cleaning device for cleaning a filter of a filter unit connected in a pipeline.

[0002]

2. Description of the Related Art First, an example of providing a filter unit in a conduit will be described. For example, the lubricating oil stored in the supply tank is supplied to the lubrication unit, the lubricating oil discharged from the lubrication unit is discharged to the discharge tank, and the lubricating oil in the discharge tank is filtered by the filter unit to the supply tank. In the case of recirculation, foreign matter such as abrasion powder of the lubrication part adheres to the primary side of the filter of the filter unit, so it is necessary to regularly replace or wash the filter.

[0003] Here, since it is difficult to perform maintenance work to replace the filter or remove the filter from the pipe line to perform cleaning, the lubricating oil of the supply tank is poured into the secondary side of the filter unit, and the flow rate of the lubricating oil changes depending on the flow rate. There is a method of removing foreign matter attached to the primary side of the filter and discarding the foreign matter together with the lubricating oil required for cleaning. This cleaning method is called a back cleaning method because the lubricating oil is caused to flow back through the flow path opposite to the normal flow path.

[0004]

In order to remove the foreign matter adhering to the filter, the fluid must be circulated at a flow velocity higher than a certain level. Along with this, the flow rate of the fluid required for cleaning increases, and it is extremely uneconomical to discard a large amount of fluid such as lubricating oil together with foreign matter, and there are many problems from the viewpoint of environmental pollution.

[0005]

According to the present invention, there is provided a supply tank for storing a fluid supplied to a supply section, a discharge tank for storing a fluid discharged from the supply section, a pump and a first switching valve. A first return path connecting between the discharge tank and the primary side of the filter unit, and a second return path connecting between the secondary side of the filter unit and the supply tank, A reverse flow path having a pump and a second switching valve to connect between the supply tank and the secondary side of the filter unit, and a primary side of the filter unit having a third switching valve and the A waste path branched from between the first switching valve and an on-off valve connected to the second return path,
And a drive means for maintaining the open valve in an open state when the first return passage is opened and for intermittently opening and closing the open / close valve when the reverse passage is opened.

[0006]

According to the present invention, when the fluid is filtered, the second switching valve is closed to shut off the reverse flow path, the third switching valve is closed to shut off the waste passage, and the first switching valve is closed. To open the first return path, maintain the on-off valve in the open state by the drive means to open the second return path, and pump the fluid in the discharge tank through the first return path to the filter unit. The fluid flowing from the primary side to the secondary side and filtered by the filter unit can be returned to the supply tank by the second return path. When cleaning the filter, close the first switching valve to shut off the first return path, open the second switching valve to open the reverse flow path, and open the third switching valve to open the waste path. And the fluid in the supply tank is passed from the secondary side of the filter unit to the primary side through the reverse flow path by the pump, so that the foreign matter adhering to the primary side of the filter unit is separated, and the separated foreign matter is mixed with the fluid. The liquid is discarded from the waste passage, and at this time, the drive means can intermittently open and close the on-off valve to interrupt the flow of the fluid, which makes it possible to reduce the amount of the fluid discarded as compared with the case where the fluid is continuously flowed. In addition, it is possible to reduce the flow, and by causing the fluid to flow backward intermittently, it is possible to generate a pulsating flow in which the high velocity wave and the low velocity wave are alternately changed. Filter unit filter It can be effectively detached foreign matter adhering to the data.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. A supply tank 2 and a discharge tank 3 for storing a lubricating oil 1 which is a fluid are provided. A lubrication unit 4, which is a supply unit, is connected between the supply tank 2 and the discharge tank 3. Reference numeral 5 denotes a filter unit containing a filter 6, the primary side of the filter unit 5 and the discharge tank 3 are connected by a first return path 7, and the secondary side of the filter unit 5 and the supply tank 2 are connected to each other. The two return paths 8 are connected. The first return path 7 is provided with a valve 9, a filter 10, a pump 11, and a first switching valve 12. Further, a relief valve 14 is provided in the branch passage 13 that is branched from the middle of the second reflux passage 8 and connected to the supply tank 2.

Next, a reverse flow path 15 which connects the supply tank 2 and the secondary side of the filter unit 5 is provided. The reverse flow path 15 and the first return flow path 7 partially share each other. The shared portion is a portion between the primary side of the filter 10 and the vicinity of the inlet of the first switching valve 12. In the reverse flow path 15, the valve 16 located upstream of the filter 10 and the pump 11 are provided.
And a second switching valve 18 located near a branch point 17 between the outlet of the first switching valve 12 and the first switching valve 12. Furthermore, the first switching valve 12 and the filter unit 5
One end of a waste path 19 branched from the primary side is connected to a waste tank (not shown) other than the supply tank 2 and the discharge tank 3, and the waste path 19 includes an orifice 20 and a third tank. And the switching valve 21 of. Further, the filter unit 5 is provided with a drain cock 22, and the drain cock 22 is connected to the waste passage 19. Further, the on-off valve 2 is provided in the second return path.
3 is connected. The valves 9, 16 and the first, second, third switching valves 12, 18, 21 and the opening / closing valve 2
3 is a solenoid valve. A drive means (not shown) is provided to maintain the open valve 23 in an open state when the first return passage 7 is opened and to intermittently open and close the open / close valve 23 when the reverse passage 15 is opened. There is.

In such a structure, the lubricating portion 4 is lubricated by the lubricating oil 1 supplied from the supply tank 2, and the lubricating oil 1 contaminated by the lubrication is stored in the discharge tank 3.
When filtering the lubricating oil 1, the valve 9 is opened, the valve 16 is closed, the second switching valve 18 is closed to shut off the reverse flow path 15, and the third switching valve 21 is closed to discard the waste path 19. Shut off,
The first switching valve 12 is opened to open the first return path 7,
The opening / closing valve 23 is maintained in an open state by the driving means to open the second return passage 8. In this state, the pump 11 causes the lubricating oil 1 in the discharge tank 3 to flow from the primary side to the secondary side of the filter unit 5 through the first return path 7, and the lubricating oil 1 filtered by the filter 6 is supplied to the second return path 7. Return to the supply tank by 8.

When cleaning the filter 6, the valve 9 and the first switching valve 12 are closed to shut off the first return path 7, and the valve 16 and the second switching valve 18 are opened to open the reverse flow path. 15 is opened, the third switching valve 21 is opened, and the waste path 19 is opened. In this state, the pump 11 causes the lubricating oil 1 in the supply tank 2 to flow from the secondary side to the primary side of the filter unit 5 through the reverse flow path 15 so that the foreign matter adhering to the primary side of the filter 6 is removed and removed. The foreign matter is discarded together with the lubricating oil 1 from the waste path 19. At this time, the opening / closing valve 23 can be intermittently opened / closed by the driving means to interrupt the flow of the lubricating oil 1, and the flow rate is limited by the orifice 20 to allow the excess lubricating oil 1 to escape to the relief valve 14. As a result, the amount of lubricating oil 1 to be discarded can be reduced as compared with the case where the lubricating oil 1 is continuously supplied. Moreover, by intermittently backflowing the lubricating oil 1, it is possible to generate a pulsating flow in the lubricating oil 1 in which a wave having a high flow velocity and a wave having a low flow velocity are alternately changed. The foreign matter adhering to the filter 6 of 5 can be effectively removed.

Further, when the filter 6 is severely clogged, the internal pressure of the reverse flow path 15 increases, but when the internal pressure reaches a certain level or more, the relief valve 14 opens to apply the pressure applied to the filter 6 to the supply tank. Since it escapes to 2, the reverse flow path 15 and the filter 6 can be protected.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the above embodiment, the first reflux passage 7 and the reverse flow passage 15 share a part of each other, and the same pump 11 sends the lubricating oil 1 to the first return passage 7 or the reverse flow passage 15. In this embodiment, the reverse flow path 24 is separately provided for the first reflux path 7. Therefore, in this embodiment, the valves 9 and 16 used in FIG. 1 are omitted. This reverse flow path 24 shares a part on the filter unit 5 side with the second return flow path 8. Then, in the reverse flow path 24, the second switching valve 18, the pump 25, and the filter 26 are arranged and arranged between the branch point 27 of the second return path 8 and the supply tank 2. ..

With such a structure, when filtering the lubricating oil 1, the second switching valve 18 is closed to shut off the reverse flow passage 24, and the third switching valve 21 is closed to shut off the waste passage 19. , The first switching valve 12 is opened to open the first return passage 7, the opening / closing valve 23 is kept open by the driving means, and the second return passage 8 is opened. In this state, the pump 11 causes the lubricating oil 1 in the discharge tank 3 to flow from the primary side to the secondary side of the filter unit 5 through the first return path 7, and the lubricating oil 1 filtered by the filter 6 is supplied to the second return path 7. Return to the supply tank by 8.

When cleaning the filter 6, the first switching valve 12 is closed to shut off the first return passage 7, the second switching valve 18 is opened to open the reverse flow passage 24, and the third switching valve 18 is opened. The switching valve 21 is opened to open the disposal path 19. In this state, the pump 25 causes the lubricating oil 1 in the supply tank 2 to flow from the secondary side of the filter unit 5 to the primary side through the reverse flow path 24, thereby removing the foreign matter adhering to the primary side of the filter 6 and separating it. The foreign matter is discarded together with the lubricating oil 1 from the waste path 19. At this time, the drive means intermittently opens and closes the on-off valve 23, so that a pulsating flow can be generated in the lubricating oil 1 to be backflowed. Therefore, it is possible to achieve the same purpose as in the above embodiment.

The present invention is applied to the case of cleaning a filter for capturing foreign matters contained in liquids or gases other than lubricating oil.

[0016]

The present invention has a supply tank for storing the fluid supplied to the supply section, a discharge tank for storing the fluid discharged from the supply section, a pump, and a first switching valve. A first return path connecting between the discharge tank and the primary side of the filter unit, and a second return path connecting between the secondary side of the filter unit and the supply tank,
A reverse flow path connecting the supply tank and the secondary side of the filter unit having a pump and a second switching valve,
A waste path having a third switching valve and branched from between the primary side of the filter unit and the first switching valve; an opening / closing valve connected in the second return path; When the fluid is filtered, the second switching valve is used because the opening valve is maintained in the open state when the first return passage is opened, and the opening and closing valve is opened and closed intermittently when the reverse passage is opened. To shut off the reverse flow path, close the third switching valve to shut off the waste path, open the first switching valve to open the first return path, and open the on-off valve by the driving means. While maintaining the state, the second reflux passage is opened, the fluid in the discharge tank is caused to flow from the primary side to the secondary side of the filter unit through the first reflux passage by the pump, and the fluid filtered by the filter unit is discharged to the second side. It is possible to recirculate to the supply tank through the recirculation path of the In this case, the first switching valve is closed to shut off the first return path, the second switching valve is opened to open the reverse flow path, and the third switching valve is opened to open the waste path. Opening
A pump causes the fluid in the supply tank to flow from the secondary side to the primary side of the filter unit through the reverse flow path, so that foreign substances adhering to the primary side of the filter unit are separated, and the separated foreign substances are discarded from the waste passage together with the fluid. However, at this time, it is possible to intermittently open and close the on-off valve by the driving means to interrupt the flow of the fluid, and thereby, it is possible to reduce the amount of waste of the fluid as compared with the case where the fluid is continuously flowed. It can be done, and by making the fluid flow backward intermittently,
A pulsating flow in which a wave having a high flow velocity and a wave having a low flow velocity are alternately changed can be generated in the fluid, whereby foreign matter adhering to the filter of the filter unit can be effectively separated by the wave having a high flow velocity. Have an effect.

[Brief description of drawings]

FIG. 1 is a conduit diagram showing a first embodiment of the present invention.

FIG. 2 is a conduit diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Fluid 2 Supply Tank 3 Discharge Tank 4 Supply Section 5 Filter Unit 7 First Reflux Path 8 Second Reflux Path 11 Pump 12 First Switching Valve 15 Reverse Flow Path 18 Second Switching Valve 19 Waste Path 21 Third Switching valve 23 Open / close valve 24 Reverse flow path 25 Pump

Claims (1)

[Claims] 1. A supply tank for storing fluid supplied to a supply unit, a discharge tank for storing fluid discharged from the supply unit, a discharge tank having a pump and a first switching valve, A first return path connecting between the primary side of the filter unit, a second return path connecting between the secondary side of the filter unit and the supply tank, a pump and a second switching valve And a reverse flow path connecting the supply tank and the secondary side of the filter unit, and a third switching valve between the primary side of the filter unit and the first switching valve. A waste passage branched from the opening / closing valve, an opening / closing valve connected to the second return passage, and an opening / closing valve that is kept open when the first return passage is opened and the opening / closing valve is opened when the reverse passage is opened. Drive means for intermittently opening and closing the Cleaning device.