JP2004000895A - Filter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely clean a filter to remove the foreign substances sticking to the filter by simple means. <P>SOLUTION: The filter apparatus comprises a filter 114 which is disposed within a housing 1 and captures the foreign substances included in oil (filtration fluid) past the filter in the process of flowing in the housing, cleaning means (cleaning means) 3 which is disposed on the downstream side in the oil flow direction with respect to the filter in the housing, is configured in the form of an expandable and contractible bag and removes the foreign substances sticking to the filter by moving the fluid to be filtered in the housing backward so as to pass the filter during expansion, an inflow port 35 and valve 39 for pressure fluid which are disposed in the housing and expand the cleaning means by admitting compressed air (pressure fluid) into the cleaning means and an outflow port 36 and valve 40 for pressure fluid which are disposed in the housing and contract the cleaning means by discharging the compressed air from the inside of the cleaning means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter device for removing foreign substances contained in a fluid such as oil.
[0002]
[Prior art]
For example, in a hydraulic circuit, a filter device is provided for filtering oil flowing through a pipeline to remove foreign substances contained in the oil.
[0003]
As this filter device, a cylindrical filter is provided inside the case, and the fluid (oil) flowing into the case passes through the filter from the outer peripheral side to the inner peripheral side so that foreign matter contained in the oil is captured by the filter. Further, there is a method in which a liquid is caused to flow out of the case from the inner peripheral side of the filter.
[0004]
Conventionally, with this type of filter device, when the amount of foreign matter contained in the liquid adhering to the filter increases and the filter becomes clogged, the foreign matter adhering to the filter is removed to eliminate the clogging of the filter. In order to do so, the following method is employed.
[0005]
The first method is a method in which the flow of liquid is stopped to open the case, the filter is taken out from the inside of the case, foreign substances attached to the filter are wiped off with a brush or the like, and then the filter is housed inside the case. .
[0006]
The second method is a so-called backwash, in which the fluid to be filtered flows from the outside of the case to the inside of the case in a direction opposite to the direction at the time of filtration, and the fluid to be filtered flows from the inner peripheral side to the outer peripheral side of the filter. This is a method of washing away foreign substances adhering to the filter.
[0007]
A third method is to provide a brush that rotates in the entire circumferential direction around the center axis of the filter in the case, and to rotate the brush while sliding on the outer peripheral surface or the inner peripheral surface of the filter to remove foreign matter adhering to the filter. It is a method of scraping off.
[0008]
[Problems to be solved by the invention]
The method for cleaning the filter in such a conventional filter device has the following problems.
[0009]
In the first method, every time the filter is cleaned, it is necessary to open the case, take out the filter, and after cleaning, store the filter again and close the case, and also perform a manual operation of removing foreign matter from the filter. In addition, the number of man-hours required for cleaning is large and laborious.
[0010]
A second method is a switching valve for switching the direction of the liquid flow, in addition to the line for flowing the liquid in the normal time, in order to flow the liquid in the opposite direction when cleaning the filter from the outside of the case. Is required, so that the configuration of the conduit for flowing the fluid is complicated.
[0011]
In the third method, since the brush is slid only on one of the outer peripheral surface and the inner peripheral surface of the filter, the foreign matter adhering to one surface can be scraped off, but the brush adheres to the other surface. Difficult to scrape foreign objects. In addition, foreign matter trapped between the furnace materials constituting the filter cannot be scraped.
[0012]
An object of the present invention is to provide a filter device that can easily and reliably perform cleaning for removing foreign matter attached to a filter by simple means.
[0013]
[Means for Solving the Problems]
The filter device according to the first aspect of the present invention includes a case, a fluid-to-be-filtered inflow means for flowing a fluid-to-be-filtered into the case, and a fluid-to-be-filtered outflow means for allowing the fluid to be filtered inside the case to flow out. A filter provided inside the case to capture foreign substances contained in the fluid to be filtered while passing through the inside of the case while the fluid to be filtered is provided inside the case; and a filter to be provided inside the case and provided inside the case. Cleaning means for applying a force to the filter to move the filter in the opposite direction to pass through the filter to remove foreign matter adhering to the filter; pressure fluid inflow means provided in the case for applying a pressure fluid to the cleaning means; and And a pressure fluid outlet means for removing a pressure fluid acting on the cleaning means.
[0014]
According to the configuration of the present invention, the cleaning means is operated by applying a pressure fluid while the cleaning means is operated in a simple configuration in which the cleaning means is provided inside the case, so that a strong force is applied to the filter to easily remove foreign matter adhering to the filter. And it can be detached reliably.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
[0016]
This embodiment is directed to a filter device provided with a cylindrical filter, and is applied to an application for incorporating foreign matter contained in oil by incorporating this filter device into a hydraulic circuit.
[0017]
FIG. 1 is a cross-sectional view showing the filter device in a state where normal filtration is performed, and FIG. 2 is a cross-sectional view showing the filter device in a state where the filter is cleaned. In the figure, reference numeral 1 denotes a case, 2 denotes a filter, and 3 denotes a cleaning member which is an embodiment of a cleaning unit.
[0018]
The case 1 has an upright cylindrical case body 11 and a disk-shaped lid 12. The case main body 11 is open with its upper end face positioned on the center axis, and the lid 12 is fitted and fixed to the open upper end face of the case main body 1 via a seal ring 13. An inlet 14 for inflow of oil (fluid to be filtered) is formed at the upper peripheral wall of the case body 11 at right angles to the axial direction, and an outlet 15 for outflow of oil (fluid to be filtered) is formed at the lower end face. Are formed on the central axis. A drain outlet 16 is formed in the lower peripheral wall of the case body 11 in a direction perpendicular to the axial direction and opposite to the inlet 14.
[0019]
An inflow pipe 17 is connected to the inflow port 14, and an outflow pipe 18 is connected to the outflow port 15. The inflow pipe 17 and the outflow pipe 18 are each connected to a hydraulic circuit (not shown). The inflow pipe 17 is provided with a three-way valve 19 interposed therebetween, and the outflow pipe 18 is provided with a three-way valve 20. The three-way valve 19 and the three-way valve 20 are connected by a bypass pipe 21. A drain discharge pipe 22 is connected to the drain discharge port 16, and the drain discharge pipe 22 is connected to a drain processing device (not shown). The drain discharge pipe 22 is provided with a drain discharge valve 23 interposed.
[0020]
The filter 2 has a cylindrical shape with both ends open, and is formed as a filter by various materials and various forms. Both ends of the filter 2 are attached to retaining rings 31 and 32, and the inner peripheral portions of the retaining rings 31 and 32 each have a seal ring 33. The filter 2 is arranged upright inside the case 1 on the center axis thereof.
[0021]
An annular portion 12a drawn about the central axis is formed on the inner surface of the lid 12 of the case 1, and a fixed ring 34 is screwed around the outer peripheral portion of the annular portion 12a. The holding ring 31 attached to the upper end of the filter 2 is detachably fitted to the outer periphery of the fixed ring 34 in a liquid-tight manner. An annular portion 11a is formed on the inner surface of the lower end portion of the case body 11 so as to surround the outlet 15 around the center axis. The holding ring 32 attached to the lower end of the filter 2 is detachably fitted to the annular portion 11a in a liquid-tight manner.
[0022]
Between the filter 2 held in this way and the peripheral wall of the case body 11, a space is formed which surrounds the entire circumference of the filter 2 and communicates with the inlet 14. The lower end of the filter 2 is in direct communication with the outlet 15.
[0023]
The cleaning member 3 is expandable and contractable, expands when a pressure fluid such as compressed air flows therein, and contracts when it flows out, and is formed of an elastic material such as rubber. The cleaning member 3 basically forms a bag having a port for supplying and discharging the pressurized fluid, and in this embodiment, has a cylindrical shape with one end opened and the other end closed when inflated. The outer diameter at the time of expansion is smaller than the inner diameter of the filter 2, and the length is about the same as that of the filter 2. Note that the cleaning member 3 has a sheath shape when contracted.
[0024]
The cleaning member 3 is located on the same central axis inside the filter 2 inside the case 1 and is arranged upright so that the opening end is the upper end. The upper end opening of the cleaning member 3 is fitted to the outer peripheral portion of the annular portion 12a of the lid 12, and is pressed down from the outer peripheral side and fixed by a fixed ring 34 screwed to the annular portion 12a. That is, the rib 3a is formed all around the peripheral edge of the upper end opening of the cleaning member 3, and the fixed ring 34 is formed with a step 34a that engages with the rib 3a on the outside.
[0025]
The lid 12 of the case 1 is formed with an inlet 35 for compressed air and an outlet 36 for compressed air that communicate the outside and the inside (the inside and the outside of the case 1). The outlet 36 supplies and discharges compressed air, which is an example of a pressure fluid, to the cleaning member 3. The inflow port 35 and the outflow port 36 are formed to penetrate between the inner surface and the outer surface of the lid 12 surrounded by the annular portion 12a. The portion surrounded by the annular portion 12a and the upper end opening of the cleaning member 3 face each other.
[0026]
An inflow pipe 37 for compressed air is connected to the inflow port 35 for compressed air, and the inflow pipe 37 is connected to a compressed air supply compressor (not shown). An outlet 36 for compressed air is connected to an outlet pipe 38 for compressed air, and the outlet pipe 38 is connected to an open blower (not shown) for discharging compressed air. The inflow pipe 37 is provided with an inflow valve 39 interposed therebetween, and the outflow pipe 38 is provided with an outflow valve 40 interposed therebetween.
[0027]
The operation of the filter device configured as described above will be described.
Normally, a case in which an oil which is a fluid to be filtered is flown to perform filtration will be described with reference to FIG. In this case, the compressed air inflow valve 39 is closed, the compressed air does not supply the compressed air to the cleaning member 3, and the cleaning member 3 is kept in a contracted state. For this reason, a large space can be secured inside the filter 2 and oil can flow smoothly. The drain discharge valve 23 is closed.
[0028]
The three-way valve 19 is operated to open the inflow pipe 17 and close the bypass pipe 21, and the three-way valve 20 is operated to open the outflow pipe 18 and close the bypass pipe 21. The oil in the hydraulic circuit flows through the inflow pipe 17 and flows into the case 1 from the inflow port 14 at the upper end of the apparatus main body 1 via the three-way valve 19. The oil flows into the space on the outer peripheral side of the cylindrical filter 2 surrounded by the peripheral wall of the case main body 11 of the case 1, passes through the filter 2, and flows into the space on the inner peripheral side of the filter 2. When the oil passes through the filter 2, foreign matter contained in the oil is captured by the filter 2. The oil that has passed through the filter 2 flows out of the outlet 15 at the lower end of the case 1, flows through the outlet pipe 18 via the three-way valve 20, and returns to the hydraulic circuit.
[0029]
When the amount of foreign matter to be captured increases, the filter 2 is clogged, and the filtering effect is reduced. For this reason, the clogged filter 2 is cleaned to remove the clogging. The case of cleaning the filter 2 will be described with reference to FIG.
[0030]
In this case, the three-way valve 19 is operated to close the inflow pipe 17 with respect to the inflow port 14 and communicate with the bypass pipe 21. By operating the three-way valve 20, the outflow pipe 18 is closed with respect to the outflow port 15 and communicates with the bypass pipe 21. Therefore, the oil flowing from the hydraulic circuit through the inflow pipe 17 enters the bypass pipe 21 at the three-way valve 19, flows through the bypass pipe 21, enters the outflow pipe 18 at the three-way valve 20, and returns to the hydraulic circuit again. Therefore, the flow of oil to the case 1 is shut off, and the oil remains inside the case 1. Next, the drain discharge valve 23 is opened.
[0031]
Then, the inflow pipe 37 communicates with the case 1 by opening the inflow valve 39 for compressed air. The compressed air pressurized by the compressor flows through the inflow pipe 37, passes through the inflow valve 39, passes through the inflow port 35, and flows into the inner space of the annular portion 12a formed on the inner surface of the lid 12. Since the upper end opening of the cleaning member 3 is fixed to the annular portion 12 a of the lid 12, the compressed air directly flows into the inside of the cleaning member 3 contracted in a sheath shape through the upper end opening of the cleaning member 3. . As the amount of compressed air flowing into the inside of the cleaning member 3 increases, the compressed air spreads throughout the inside of the cleaning member 3 and pushes the cleaning member 3 outward by the pressure. The compressed air rapidly flows into the cleaning member 3 at a flow rate capable of rapidly expanding the cleaning member 3. For this reason, the cleaning member 3 rapidly (instantly) expands to the maximum expansion state having a cylindrical shape by the inflow of the compressed air. In addition, the cleaning member 3 does not collide with the filter 2 when it expands to the maximum.
[0032]
When the cleaning member 3 expands and increases in volume, the ratio of the volume occupied in the space inside the filter 2 increases, and the oil in this space is removed and pushed out of the filter 2. Most of the removed oil passes through the filter 2 and moves to the space between the filter 2 and the peripheral wall of the case body 11.
[0033]
Then, when the cleaning member 3 expands rapidly (instantly), the cleaning member 3 rapidly (instantly) applies a large force (impact force) to the oil in the space inside the filter 2, so that the filter 2 Push outward (instantly). For this reason, the oil pressurized by the impact force by the cleaning member 3 moves rapidly in the opposite direction to the normal filtration and passes through the filter medium of the filter 2 so that the foreign matter adhering to the filter medium of the filter 2 Foreign matter is strongly knocked off the filter 2 by applying an impact force to the filter. In this case, foreign matter adhering to both the outer peripheral surface and the inner peripheral surface of the filter 2 can be knocked down. Further, since the cleaning member 3 has a sheath shape, by expanding, the pressure can be uniformly applied to the oil toward the outer peripheral side of the filter over the entire circumferential direction of the filter. The foreign matter can be removed by rapidly passing the oil uniformly through the portion.
[0034]
The oil that has passed through the filter 2 flows together with foreign matter toward the drain discharge port 16 at the lower end of the case 1, flows from the drain discharge port 16 through the drain discharge pipe 22, passes through the drain discharge valve 23, and is conveyed to the drain processing device. It is processed.
[0035]
In this way, when the cleaning member 3 expands, the impact force is applied to the oil, and the foreign substances adhering to the filter 2 are instantaneously and strongly washed off to remove the clogging of the filter 2. Further, since the clogging of the filter 2 is removed by instantly moving the oil to be filtered, the amount of drain can be reduced.
[0036]
Next, the inflow valve 39 for compressed air is closed and the outflow valve 40 for compressed air is opened. As a result, the inflow of the compressed air from the inflow pipe 37 to the cleaning member 3 is blocked, and the compressed air inside the cleaning member 3 flows out of the outflow port 36, flows through the outflow valve 40, flows through the outflow pipe 38, and is discharged. You.
[0037]
Next, the drain discharge valve 23 is closed. By operating both three-way valves 19 and 20 simultaneously, the inflow pipe 17 is connected to the inflow port 14 and the outflow pipe 18 is connected to the outflow port 15. As a result, the oil in the hydraulic circuit flows into the case 1, flows through the inside, and then flows out. The cleaning member 3 contracts as the compressed air flows out and is pressed by the oil flowing into the case 1. The outflow valve 40 is closed when the cleaning member 3 has contracted to the minimum contracted state.
[0038]
Thus, with this filter device, clogging of the filter 2 can be quickly and strongly removed. Moreover, the means for removing the clogging of the filter 2 is simple because the cleaning member 3 consisting of an inflatable and contractible bag body is merely provided inside the case 1. In addition, the operation for removing the clogging of the filter medium of the filter 2 is easy because the cleaning member 3 is merely expanded by supplying a pressure fluid, for example, compressed air, to the cleaning member 3. Further, since the cleaning member 3 is in a contracted state when filtering the oil (the fluid to be filtered), it does not hinder the flow of the fluid to be filtered.
[0039]
Further, since the pressure fluid is used to remove the clogging of the filter medium, the cleaning fluid 3 is expanded by using the pressure fluid without directly flowing and flowing the pressure fluid into the case 1. By preventing mixing with a certain fluid to be filtered, the fluid to be filtered is prevented from being deteriorated due to mixing of a pressure fluid.
[0040]
Furthermore, if compressed air is used as the pressure fluid for expanding the cleaning member 3, the cost of the pressure fluid itself is low and the equipment for supplying the pressure fluid is simple and economical.
[0041]
Further, the drain flow rate is equal to the capacity of the cleaning member 3 as a bag, and clogging can be effectively removed with a very small drain amount. In addition, there is no need to vent air.
[0042]
Furthermore, since the case 1 is provided with the drain outlet 16 and the outlet 16 is connected to the outlet pipe 22 having the outlet valve 23, the foreign matter removed from the filter 2 can be easily taken out of the case 1. Can be.
[0043]
When a cylindrical filter 2 is used as a filter and a cleaning member 3 is provided inside the filter 2, the action of removing the clogging of the filter 2 by expanding the cleaning member 3 forming a bag with a pressure fluid is most effective. It can be used effectively.
[0044]
In the above-described embodiment, the cleaning member 3 formed of a cylindrical bag is used as the cleaning means, and the shape of the cleaning means is suitable for removing clogging of the cylindrical filter 2. The cleaning means is not limited to the use of a cylindrical bag, but may be, for example, a bellows bag.
[0045]
FIG. 3 is a cross-sectional view showing a filter device using a cleaning member 3 formed of a bellows-shaped bag as a second embodiment, and the same parts as those in FIG. 2 are denoted by the same reference numerals. In FIG. 3, reference numeral 4 denotes a cleaning means formed of a bellows-shaped bag. The cleaning means 4 is provided on the case 1 in the same manner as the cleaning member 3.
[0046]
In each of the above-described embodiments, the cleaning unit is expanded in a state separated from the filter. However, the present invention is not limited to this, and the cleaning unit may collide with the filter when expanded. When the fluid to be filtered is flowing from the outer peripheral side to the inner peripheral side of the filter as in the above-described embodiment, the cleaning means is provided on the inner peripheral side of the filter (downstream in the flow direction of the fluid to be filtered). When the fluid to be filtered flows from the outer peripheral side to the inner peripheral side of the filter, the cleaning means is provided on the outer peripheral side of the filter (downstream in the flow direction of the fluid to be filtered).
[0047]
A third embodiment will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing the filter device in a state in which ordinary filtration is performed, and FIG. 5 is a cross-sectional view showing the filter device in a state in which the filter is cleaned. In FIGS. 4 and 5, the same portions as those in FIGS. Signs are attached.
[0048]
In this embodiment, a combination of a guide member (guide member) 51 and a moving member (moving member) 52 is used as cleaning means. The guide member 51 is formed of metal, and has a cylindrical body (guide member shape) having both ends opened. The diameter of the guide member 51 is smaller than the diameter of the filter 2, and the length is smaller than the length of the filter 2. The guide member 51 is located on the same central axis inside the filter 2 inside the case 1 and is arranged upright so that the opening end is the upper end. The upper end opening of the guide member 3 is fitted to the outer peripheral portion of the annular portion 12a of the lid 12, and is fixed by being pressed from the outer peripheral side by a fixed ring 34 screwed to the annular portion 12a. That is, the rib 51a is formed around the entire periphery of the upper end opening of the guide member 51, and the rib 51a is engaged with the step portion 34a of the fixed ring 34 on the outside.
[0049]
The guide member 51 provided in this manner has a lower end opening portion opened toward the space inside the filter 2. A space through which the fluid to be filtered flows is formed between the filter 2 and the guide member 51.
[0050]
The moving member 52 has a short cylindrical shape (moving member shape) made of metal, and the diameter of the moving member 52 is large enough to be slidably inserted into the guide member 51. A seal ring 53 is fitted around the outer periphery of the moving member 52. The moving member 52 is inserted into the guide member 51 so as to be movable (movable up and down) in the axial direction. Thereby, the inside of the guide member 51 is partitioned by the moving member 52 into an upper portion and a lower portion. The seal ring 53 of the moving member 52 comes into contact with the inner peripheral surface of the guide member 51 so that the space between the upper and lower parts of the guide member 51 partitioned by the moving member 52 is liquid-tightly sealed. . The weight of the moving member 52 is set to a size that can be raised inside the guide member 51 by the pressure of the fluid to be filtered inside the case 1.
[0051]
The inflow port 35 and the outflow hole 36 for compressed air communicate with the upper portion of the guide member 51 partitioned by the moving member 52, so that compressed air can flow into and out of the upper portion. ing.
[0052]
Then, when performing normal filtration, as shown in FIG. 4, the compressed air as the pressurized fluid is not supplied to the upper portion of the guide member 51 partitioned by the moving member 52. Oil, which is the fluid to be filtered, flows from the outer peripheral side to the inner peripheral side of the filter 2 inside the case 1, and the filter 2 captures foreign substances contained in the oil. Here, the oil on the inner peripheral side of the filter 2 flows into the inside of the guide member 51 through the lower end opening of the guide member 51, and lowers with respect to the moving member 52 provided inside the guide member 51. Apply pressure from the side. The moving member 52 is pushed by the oil, moves up inside the guide member 51, abuts on the lower end of the annular portion 12 a of the lid 12 and stops. That is, the oil flows into most of the inside of the guide member 51 and pushes up the moving member 52. The position where the moving member 52 is stopped by being pushed up by the oil is the standby position P. The standby position P is for holding the moving member 52 at a position away from a cleaning position O described later.
[0053]
Other operations in the case of performing normal oil filtration are the same as those in the above-described first embodiment.
[0054]
When the filter 2 is cleaned, as shown in FIG. 5, the oil flowing from the hydraulic circuit through the inflow pipe 17 flows through the bypass pipe 21 and returns to the hydraulic circuit again. Therefore, the flow of oil to the case 1 is shut off, and the oil remains inside the case 1. Open the drain discharge valve 23.
[0055]
The inflow valve 39 for compressed air is opened to communicate the inflow pipe 37 to the case 1. The compressed air flowing through the inflow pipe 37 flows into the inner space of the annular portion 12a formed on the inner surface of the lid 12 via the inflow valve 39 and the inflow port 35, and contacts the lower end of the annular portion 12a. Pressure is applied to the moving member 52 from above to push the moving member 52 down. The moving member 52 is pushed by the compressed air, moves away from the lower end of the annular portion 12a, and rapidly moves down inside the guide member 51. When the moving member 52 rapidly moves down inside the guide member 51, the oil flowing into the guide member 51 is pressed down by applying pressure from above. For this reason, the oil inside the guide member 51 is rapidly pushed out of the filter 2 from the lower end opening of the guide member 51.
[0056]
As the moving member 52 descends, the upper portion partitioned by the moving member 52 inside the guide member 51 expands, and the amount of compressed air flowing into this portion increases to further push the moving member 52 down. Conversely, as the moving member 52 descends, the lower portion partitioned by the moving member 52 inside the guide member 51 is reduced, and the oil in this portion is pushed out of the guide member 51.
[0057]
When the oil inside the guide member 51 is rapidly pushed out into the filter 2 in this way, the oil on the inner peripheral side of the filter 2 is pushed by the oil pushed out from the guide member 51 and the filter 2 rapidly moves toward the outer peripheral side, passes through the filter 2 and is pushed to the outer peripheral side. When the oil moves rapidly and passes through the filter 2, the oil applies an impact force to the foreign matter adhering to the filter 2 and strongly strikes the foreign matter from the filter 2. In this case, foreign matter adhering to both the outer peripheral surface and the inner peripheral surface of the filter 2 can be knocked down. Further, the oil extruded from the guide member 51 can apply pressure uniformly to the oil inside the filter 2 over the entire circumferential direction. As a result, the oil is uniformly applied to the entire circumferential portion of the filter 2. The foreign matter can be removed by passing it rapidly.
[0058]
The oil that has passed through the filter 2 flows together with foreign matter toward the drain discharge port 16 at the lower end of the case 1, flows from the drain discharge port 16 through the drain discharge pipe 22, passes through the drain discharge valve 23, and is conveyed to the drain processing device. It is processed.
[0059]
The moving member 52 moves down to the lower part of the guide member 51 and stops at a position where the pressures of the compressed air and the oil are balanced. This position is the cleaning position O because the moving member 52 descends and stops while cleaning the film 2. Note that a removable stopper (not shown) may be provided below the guide member 51 to regulate the lowering position (cleaning position O) of the moving member 52.
[0060]
Other operations in the case of cleaning the filter are the same as those in the first embodiment.
[0061]
By moving the moving member 52 in this manner, a force is applied to the oil to move in a direction opposite to the normal flow, and the foreign substances adhering to the filter 2 are instantly and strongly washed off, and the filter material of the filter 2 is removed. Clear the clog. Further, since the clogging of the filter medium of the filter 2 is removed by instantly moving the oil to be filtered, the amount of drain can be reduced.
[0062]
Thus, with this filter device, clogging of the filter 2 can be quickly and strongly removed. In addition, the means for removing the clogging of the filter 2 has a simple configuration because only the guide member 51 and the moving member 52 that moves inside the guide member 51 are provided inside the case 1. Further, the operation for removing the clogging of the filter 2 is easy because the pressure member, for example, the compressed air is supplied to the guide member 51 to move the moving member 52.
[0063]
In addition, since the pressure fluid is used to move the moving member 52 without directly flowing and flowing the pressure fluid into the case 1 in order to remove the clogging of the filter 2, the pressure fluid is moved inside the case 1. By preventing the fluid to be filtered from being mixed with the filtering fluid, the fluid to be filtered is prevented from being deteriorated due to the mixing of the pressure fluid.
[0064]
Furthermore, if compressed air is used as the pressure fluid for moving the moving member 52, the cost of the pressure fluid itself is low, and the equipment for supplying the pressure fluid is simple and economical.
[0065]
Further, when a cylindrical filter 2 is used as a filter, and a guide member 51 and a movable member 52 are provided inside the filter 2, the filter 2 is expanded by a pressurized fluid so that the filter 2 The effect of removing clogs can be utilized most effectively.
[0066]
A fourth embodiment will be described with reference to FIGS.
[0067]
The filter device according to this embodiment includes a plurality of units configured as a single unit by combining a case, a filter, and a cleaning unit, and a filter to be filtered that flows a fluid to be filtered into each case of the plurality of units. A fluid inflow means and a fluid to be filtered out means for allowing the fluid to be filtered in each case to flow out to the outside; a pressure fluid inflow means provided in the case of a plurality of sets of units for applying the pressure fluid to the cleaning means; Pressure fluid outflow means for removing the pressure fluid acting on the cleaning means. As the cleaning means, a combination of the guide member (guide member) and the moving member (moving member) employed in the third embodiment described above is used. In this embodiment, two sets of units are provided.
[0068]
6 is a front view showing the filter device of this embodiment, FIG. 7 is a plan view thereof, FIG. 8 is a bottom view thereof, FIG. 9 is a side view seen from the Z direction of FIG. 6, and FIG. FIG. 11 is a cross-sectional view taken along line BB and CC of FIG. 12, and FIG. 12 is a plan view taken along line DD of FIG.
[0069]
In the figure, 101 is a left unit (first unit) shown on the left side in FIG. 1, and 102 is a right unit (second unit) shown on the right side in FIG. 1. These left unit 101 and right unit 102 stand upright. They are arranged side by side and attached to a base block 103 arranged below these blocks.
[0070]
The left unit 101 and the right unit 102 have the same configuration. That is, in the drawing, reference numeral 111 denotes a case, which is composed of a case main body 112 formed of an upright cylindrical body with both upper and lower ends opened, and a lid 113 covering the open upper end of the case main body 112.
[0071]
Inside the case 111, a filter 114 is arranged upright on the same concentric axis. The filter 114 has a cylindrical shape with both upper and lower ends open, and an end cover 115 is detachably attached to the upper end thereof and closed. An end cover 119 is detachably attached to the lower end of the filter 114. The end cover 119 has a central portion formed with a hole through which a fluid to be filtered passes. The lid 113 is provided with an exhaust plug 116 and an air vent valve 117, and the lid 113 supports an end lid 115 via a support member 118. The air vent valve 117 discharges the air to the atmosphere when the air accumulates inside the case 111.
[0072]
Inside the filter 114, a cylinder 121 (guide member), which is one of the cleaning means, is arranged upright on the same axis as the case 111, and a piston 122 (moving member) is also vertically moved inside the cylinder 121. Inserted as possible. The upper end of the cylinder 121 is open, and an end ring 123 is fitted to the lower end. The end ring 123 is attached to a cylinder support tube 124 arranged upright below the cylinder 121. The lowering position of the piston 122 is regulated by its own weight by the end ring 123, and the rising is regulated by a ring 125 provided at the upper end of the cylinder 121. A seal ring 126 is attached to the outer peripheral surface of the piston 122 to make the space between the piston 122 and the inner peripheral surface of the cylinder 121 airtight and liquid tight. As will be described later, the rising position of the piston 122 is the cleaning position O, and the descending position is the standby position P.
[0073]
Thus, the left unit 101 and the right unit 102 are configured.
A switching valve chamber 131 is formed horizontally at the center of the base block 103 in the left-right direction along the front-rear direction. The switching valve chamber 131 forms a hole having a circular cross section for inserting a switching valve 151 to be described later, and has a front end opened at the front of the base block 103. Parts supporting the left unit 101 and the right unit 102 are formed on the left and right sides of the base block 103, respectively. That is, on the left and right sides of the base block 103, circular plate-shaped case supporting portions 132A and 132B, and a cylindrical filter inside the case supporting portions 132A and 132B and located on the same axis as the case supporting portions 132A and 132B. Support portions 133A and 133B are respectively formed, and these are opened at the upper surface portion of the base block 103. Cylinder supports 134A and 134B are formed at the bottoms of the filter supports 133A and 133B, respectively, and the cylinder supports 134A and 134B are dug down vertically on the same axis as the filter supports 133A and 133B to support holes 135A. , 135B.
[0074]
The case supporting portions 132A and 132B fit and support the lower ends of the case bodies 112 of the left unit 101 and the right unit 102, and the case supporting portions 132A and 132B and the case bodies 112 are fixed using bolts 136. I have. The filter supporting portions 133A and 133B fit and support the end covers 119 at the lower ends of the filters 114 of the left unit 101 and the right unit 102. The lower portions of the cylinder support tubes 124 of the left unit 101 and the right unit 102 are supported by being screwed into support holes 135A and 135B of the cylinder support portions 134A and 134B.
[0075]
The base block 103 is provided with a fluid to be filtered inflow means for flowing the fluid to be filtered into each case 111 of each of the units 101 and 102, and a fluid to be filtered outflow means for flowing out the fluid to be filtered in each case 111 to the outside. Each is provided. 13A and 13B show the switching valve chamber 131. FIG. 13A is a cross-sectional view taken along line E1-E1 in FIG. 11, and FIG. 13B is a cross-sectional view taken along line E2-E2 in FIG.
[0076]
Below the switching valve chamber 131, there are formed an inlet 141 that opens at the lower front surface of the base block 103 and an outlet 142 that opens at the rear lower surface of the base block 103. These ports 141 and 142 are respectively formed. It communicates with the lower part of the switching valve chamber 131. The inflow port 141 and the outflow port 142 are connected to a hydraulic circuit (not shown) through which, for example, the oil to be filtered flows.
[0077]
On the left side of the switching valve chamber 131, an inflow hole 143A located at the front of the base block 103 and communicating with the inside of the case support 132A (inside of the case 111 of the left unit 101), and at the rear of the base block 103. As a result, outflow holes 144A communicating with the inside of the filter support portion 133A (the interior of the filter 114 of the left unit 101) are formed, and these holes 143A and 144A communicate with the left side of the switching valve chamber 131.
[0078]
On the right side of the switching valve chamber 131, an inflow hole 143B located at the front of the base block 103 and communicating with the inside of the case support 132B (inside of the case 111 of the right unit 102), and at the rear of the base block 103. Outlet holes 144B communicating with the inside of the filter support portion 133B (the inside of the filter 114 of the right unit 102) are formed, and these holes 143B and 144B communicate with the right side of the switching valve chamber 131. .
[0079]
In addition, an auxiliary inflow hole 145A communicating with the inside of the case support 132A (the inside of the case 111 of the left unit 101) is provided on the left side above the switching valve chamber 131, and the inside of the case support 132B (the right side) is provided on the right side. An inflow hole 145B communicating with the inside of the case 111 of the unit 102) is formed.
[0080]
A drain discharge groove 146 is formed at the center in the front-rear direction inside the switching valve chamber 131 over the entire circumferential direction. A drain discharge hole 147 is formed in the lower part of the switching valve chamber 131 of the base block 103 at a central portion in the front-rear direction along the left-right direction. Immediately below, it is connected to the drain discharge groove 146. Both ends of the drain discharge hole 147 are open, and a drain discharge valve 148 is provided at one end. This drain discharge valve is connected to a drain processing device (not shown). The other end of the drain discharge hole 147 is closed with a drain plug 149.
[0081]
A switching valve 151 is inserted inside the switching valve chamber 131 and is rotatably provided. 14A and 14B show the switching valve 151, in which FIG. 14A is a side view, FIG. 14B is a sectional view taken along line FF of FIG. 14A, and FIG. 14C is a sectional view taken along line GG of FIG. FIG. 3D is a cross-sectional view taken along line HH in FIG.
[0082]
The switching valve 151 has a shaft shape, and includes a valve part inserted into the switching valve chamber 131 and a shaft part protruding from the switching valve chamber 131. The portion to be inserted into the switching valve chamber 131 forms a shaft having a circular cross section having an outer diameter corresponding to the inner diameter of the switching valve 151, and rotates around a central axis inside the switching valve chamber 131. A front portion 152 having a rear portion 152a and a rear portion 153 having a rear closing portion 153a are formed side by side on the same axis. The front closing portion 152a and the rear closing portion 153a are drawn with the same radius around the center axis of the switching valve 151 and form arcs having the same phase.
[0083]
The front closing portion 152 a is provided so as to correspond to the front portion of the switching valve chamber 131, and slides into contact with the inner peripheral surface of the switching valve chamber 131 as the switching valve 151 rotates, and opens at the front portion thereof. , The inlet holes 143A and 143B, and the auxiliary inlet holes 145A and 145B. That is, as shown in FIG. 14 (b), the front closing portion 152a has a fan shape that covers and closes the opening areas of the inflow port 141, the inflow ports 143A and 143B, and the auxiliary inflow ports 145A and 145B. Portions of the front section 152 other than the front closing section 152a are open. This is because the switching valve chamber 131 allows portions other than the portion closed by the front closing portion 152a to communicate with each other.
[0084]
The rear closing portion 153a is provided so as to correspond to the rear portion of the switching valve chamber 131, and slides into contact with the inner peripheral surface of the switching valve chamber 131 with the rotation of the switching valve 151, and the outlet 142 opens at the rear portion thereof. The holes 144A and 144B are closed and opened. That is, as shown in FIG. 14 (c), the rear closing portion 153a has a fan shape that covers and closes the opening areas of the outflow port 142 and the outflow holes 144A and 144B, and the rear closing portion 153a at the front of the switching valve 151. The parts except are open. This is to make the portions of the switching valve chamber 131 other than the portion closed by the rear closing portion 153a communicate with each other.
[0085]
A drain discharge recess 154 that extends from the front closing portion 152a to the center in the length direction of the switching valve 151 is formed at the center of the outer periphery of the front closing portion 152a. This notch 154 is for receiving the drain flowing out of the inflow holes 143A, 143B during filter cleaning (backwashing). A drain discharge groove 155 is formed at the center in the length direction of the switching valve 151 over the entire circumferential direction, and this groove 155 is continuous with the drain discharge recess 154. The drain discharge groove 155 is located opposite the drain discharge groove 146 of the switching valve chamber 131, and forms a drain discharge hole which surrounds the entire circumferential direction of the switching valve 151 and communicates with the drain discharge hole 147.
[0086]
The front part 152 and the rear part 153 of the switching valve 151 are partitioned in the length direction with the drain discharge groove 155 interposed therebetween. As a result, the front part of the switching valve chamber 131 is partitioned by the front part 152 of the switching valve 151, the rear part is partitioned by the rear part 153 of the switching valve 151, and the fluid flowing through the front part flows to the rear part, and the fluid flowing through the rear part flows into the front part. Each one does not leak.
[0087]
A holding cover 156 is attached to the front end opening of the switching valve chamber 131 on the front surface of the base block 103. The holding lid 156 closes the front end opening of the switching valve chamber 131 to press the valve portion of the switching valve 151 from the outside, and rotatably inserts and supports a shaft protruding from the switching valve chamber 131.
[0088]
The base end of the handle 157 is fixed to the front end of the shaft of the switching valve 151 protruding from the holding lid 156. The handle 157 is disposed in a direction perpendicular to the axis of the switching valve 151. The operator manually rotates the switching valve 151 around the horizontal switching valve 151 to rotate the switching valve 151 so that The closing portion 152 and the rear closing portion 153 are displaced in the circumferential direction around the central axis of the switching valve. That is, the switching valve 151 is rotated to displace each closing part to the area of the left unit 101 and the area of the right unit 102, respectively, and the respective holes communicating with the switching valve chamber 131 are opened and closed to open and close the respective units 101, 102. , Stop and cleaning (reverse cleaning).
[0089]
Here, as will be described later, when the handle 157 is in a vertical position, the left and right units 101 and 102 respectively perform a filtering operation, and when the handle 157 is tilted to the horizontal position on the right side in the drawing, cleaning (backwashing) is performed by the right unit 102. When the operation is performed and the display unit is moved to the horizontal position on the left side in the figure, the cleaning (backwashing) operation is performed by the left unit 101. An appropriate lock mechanism (not shown) is provided to stop the handle 157 at each switching position to be described later and to hold the switching valve 151 at that position when the handle 157 is rotated to each switching position described later.
[0090]
Note that a cam 157a is protruded from the base end of the handle 157. The cam 157a rotates integrally with the handle 157 to operate switches 162A and 162B provided in combination with air valves 161A and 161B for controlling the supply of compressed air for cleaning (backwashing) described later. .
[0091]
Further, the base block 103 supplies compressed air, which is an example of a pressurized fluid, to a cylinder 121, which is a cleaning unit provided in each of the two units 101, 102, to act on a piston 122. A pressure fluid outlet means is provided for discharging compressed air from a cylinder 121 provided in each of the units 101 and 102 to release the action of the pressure fluid on the piston 122.
[0092]
That is, as shown in FIG. 11, the base block 103 is formed at the lower ends of the support holes 135A and 135B with holes 135a opening at the front surface of the base block 103, respectively. These holes 135a are formed in the support holes 135A and 135B. It communicates with the holes of the support tubes 124A and 124B of the inserted units 101 and 102. Air pipes 163A and 163B disposed on the front side of the base block 103 are connected to the pair of holes 135a, and these air pipes 163A and 163B are connected to air valves 161A and 161B disposed on the front side of the base block 103, respectively. . As the air valves 161A and 161B, for example, electromagnetic valves are used, and drive switches 162A and 163B are provided, respectively. The air valves 161A and 161B are always closed, and are opened by driving the switches 162A and 163B. When the handle 157 reaches a position (horizontal position) where the left unit 101 and the right unit 102 are cleaned (backwashed), the switches 162A and 163B are pushed by the cam 157a of the handle 157 to operate and operate the air valves 161A and 161B. Is to open.
[0093]
The air valves 161A and 161B are commonly connected to an air pipe 164. The air pipe 164 is disposed around the base block 103 and supported by the base block 103. The air pipe 164 is connected to a compressor (not shown) that supplies compressed air, which is an example of a pressure fluid.
[0094]
The operation of the filter device configured as described above will be described with reference to FIGS. 15 is an explanatory view showing the switching position of the handle, FIGS. 16 to 18 are explanatory views showing the switching position of the switching valve, and FIGS. 19 to 21 are cross sections of the filter device showing the flow of the fluid to be filtered in each unit. FIG.
[0095]
The case where both the left unit 101 and the right unit 102 respectively perform filtration as shown in FIG. 19 will be described.
In this case, as shown in FIG. 15, the handle 157 is located vertically between the left unit 101 and the right unit 102. The handle can be held in that position by a locking mechanism. The switching valve 151 is in the state shown in FIG. That is, the front closing portion 152a of the switching valve 151 is located above the front portion of the switching valve chamber 131 as shown in FIG. 16A, and closes the openings of the auxiliary inflow holes 145A and 145B. The opening of the inflow port 141, the inflow port 143A, and the inflow port 143B in the front part of the switching valve chamber 131 is open. The rear closing part 153a is located at the upper part of the rear part of the switching valve chamber 131 as shown in FIG. 16B, and the outlet 142 and the outlets 144A and 144B at the rear part of the switching valve chamber 131 are opened. I have.
[0096]
Therefore, in the left unit 101 and the right unit 102, the oil flowing through the hydraulic circuit, which is the fluid to be filtered, can flow through the filter 114, and the oil flows as shown in FIG. 19 to perform the filtration. The oil flows from the inlet 141 of the base block 103 to the front part of the switching valve chamber 131 partitioned by the front part 152 of the switching valve 151.
[0097]
In the left unit 101, the oil passes through the inflow hole 143 </ b> A from the switching valve chamber 131 of the base block 103, enters the inside of the case 111 of the left unit 101, passes through the filter 114 from the outer peripheral side, and enters the inner peripheral side. When the oil passes through the filter 114, foreign substances contained in the oil are captured by the filter 114 and filtered. Subsequently, the oil passes through the outlet 144A of the base block 103 from the inner peripheral side of the filter 114 of the filter 114, enters the rear part of the switching valve chamber 131 partitioned by the rear part 153 of the switching valve 151, and further passes through the outlet 142. Out to the hydraulic circuit.
[0098]
In the right unit 102, the oil passes through the inflow hole 143 </ b> B from the switching valve chamber 131 of the base block 103, enters the inside of the case 111 of the right unit 102, passes through the filter 114 from the outer peripheral side, and enters the inner peripheral side. When the oil passes through the filter 114, foreign substances contained in the oil are captured by the filter 114 and filtered. Subsequently, the oil passes through the outflow hole 144B of the base block 103 from the inner peripheral side of the filter 114 of the filter 114, enters the rear portion of the switching valve chamber 131 partitioned by the rear portion 153 of the switching valve 151, and further passes through the outlet 142. Out to the hydraulic circuit.
[0099]
The air valves 161A and 161B are normally closed to shut off the air pipes 163A and 163B. Therefore, the compressed air is not sent to the cylinders 121 of the units 101 and 102. The piston 122 of each of the units 101 and 102 rests on its support ring 123 at the lower end of the cylinder 121 under its own weight and internal pressure. That is, the piston 122 is at the standby position P.
[0100]
The case where the left unit 101 performs filtration and the right unit 102 stops filtration as shown in FIG. 20 will be described.
In this case, as shown in FIG. 15, the handle 157 rotates from the vertical position to the right side at a position inclined at an angle of, for example, 65 °. The switching valve 151 rotates together with the handle 157 to the same position as shown in FIG. That is, the front closing portion 152a of the switching valve 151 is inclined rightward at an angle of 65 ° as shown in FIG. 17A to open the openings of the auxiliary inflow hole 145B and the right inflow hole 143B in the front portion of the switching valve chamber 131. Close each one. However, the drain discharge recess 154 formed in the front closing portion 152a faces the opening of the inflow hole 143B. The openings of the inflow port 141 and the inflow port 143A are open. The rear closing portion 153a is tilted to the right at an angle of 65 ° to close the opening of the right outlet hole 144B at the rear of the switching valve chamber 131 as shown in FIG. The openings of the outlet 142 and the outlet 144A are open.
[0101]
Therefore, the left unit 101 is in a state where the oil flows through the filter 114, and the oil flows and the filtering operation is performed as in the case described above. In the right unit 102, since the inflow hole 143B and the outflow hole 144B are closed, a passage through which oil flows into the case 111, passes through the filter 114, and then flows out of the case 111 is shut off, and the filtering operation is performed. It is in a stopped state. The drain discharge recess 154 of the front closing portion 152a of the switching valve 151 faces the opening of the inflow hole 143B.
[0102]
Therefore, when oil (drain) exists inside the case 111 of the right unit 102, the drain flows through the inflow hole 143A and enters the drain discharge recess 154 of the front closing portion 152a, and further, the drain discharge groove of the switching valve 151. 155 and through the portion surrounded by the drain discharge groove 146 of the switching valve chamber 131, and flows out to the drain discharge hole 147 of the base block 103. Therefore, the right unit 102 can discharge oil (drain). The right unit 102 can be disassembled and washed.
[0103]
The case where the left unit 101 performs filtration and the right unit 102 cleans (backwashes) the filter 114 as shown in FIG. 21 will be described.
In this case, as shown in FIG. 15, the handle 157 rotates from the vertical position to the right side to a horizontal position inclined at an angle of, for example, 90 °. The switching valve 151 rotates together with the handle 157 to the same position as shown in FIG. That is, the front closing portion 152a of the switching valve 151 is inclined rightward at an angle of 90 ° as shown in FIG. 18A to close the opening of the right inflow hole 143B at the front portion of the switching valve chamber 131. The entire drain discharge recess 154 formed in the front closing portion 152a faces the opening of the inflow hole 141B. The opening of the inflow port 141, the inflow hole 143A, and the auxiliary inflow holes 145A and 145B are open, respectively. The rear closing portion 153a is inclined rightward at an angle of 90 ° to close the opening of the right outlet hole 144B at the rear of the switching valve chamber 131, as shown in FIG. The outlet 142 and the outlet 144A are open.
[0104]
Therefore, the left unit 101 is in a state where the oil flows through the filter 114, and the filtering operation is performed. In the right unit 102, since the inflow hole 143B and the outflow hole 144B are closed, a passage through which oil flows into the case 111, passes through the filter 114, and then flows out of the case 111 is shut off, and the filtering operation is performed. It is in a stopped state. The drain discharge recess 154 of the front closing portion 152a of the switching valve 151 faces the opening of the inflow hole 143B. Therefore, the oil (drain) inside the case 111 of the right unit 102 can be discharged to the outside.
[0105]
On the other hand, when the handle 157 is rotated from the vertical position to the right side, for example, at an angle of 90 ° to a horizontal position, a cam 157a provided on the handle 157 is mounted on an air valve 161B provided on the right side of the drawing with respect to the switching valve 151. The operator of the set switch 162B is pressed to operate the switch 162B. The air valve 161B is opened by the driving operation of the switch 162B, and the air pipe 164 and the air pipe 163B are communicated. Therefore, the compressed air is sent from the compressor to the air pipe 163, passes through the air pipe 163B via the air valve 161B, and enters the support hole 135B through the hole 135a formed on the right side of the base block 103.
[0106]
Further, the compressed air flows from the lower end into the cylinder 121 through the inner hole of the support tube 124 of the right unit 102 and the inner hole of the support ring 123. The piston 122 placed on the end ring 123 at the lower end of the cylinder 121 and located at the standby position P is pushed up by the compressed air, moves up inside the cylinder 121 rapidly, collides with a ring 125 provided at the upper end of the cylinder 121 and stops. I do. This stop position is the cleaning position O. Due to the rapid upward movement of the piston 122, the oil inside the cylinder 121 is rapidly pushed out from the upper end opening of the cylinder into the inside of the filter 114.
[0107]
As the piston 122 moves upward, the lower portion partitioned by the piston 122 inside the cylinder 121 expands, and the amount of compressed air flowing into this portion increases to push the piston 122 further up. Conversely, as the piston 122 rises, the upper part partitioned by the piston 122 inside the cylinder 121 contracts, and the oil in this part is pushed out of the cylinder 121.
[0108]
When the oil inside the cylinder 121 is rapidly pushed out into the filter 114 in this way, the oil on the inner peripheral side of the filter 114 is pushed by the oil pushed out from the cylinder 121 and It rapidly moves toward the outer peripheral side, passes through the filter 114, and is pushed to the outer peripheral side. When the oil moves rapidly and passes through the filter 114, the oil applies an impact force to the foreign matter adhering to the filter 114 and strongly knocks the foreign matter off the filter 114. In this case, foreign matter adhering to both the outer peripheral surface and the inner peripheral surface of the filter 114 can be knocked down. Further, the oil extruded from the guide member 121 can uniformly apply pressure to the oil inside the filter 114 over the entire circumferential direction. As a result, the oil is uniformly applied to the entire circumferential portion of the filter 114. The foreign matter can be removed by passing it rapidly.
[0109]
The oil that has passed through the filter 114 flows into the inflow hole 143B of the base block 103 located below the case 111 together with foreign matter. Further, the oil flows into the drain discharge recess 154 of the front closing portion 152 of the switching valve 151 facing the opening of the inflow hole 143B in the switching valve chamber 131, and subsequently, the drain discharge groove 155 of the switching valve 151 and the switching valve chamber 131. It flows out to the drain discharge hole 147 of the base block 103 through a passage surrounded by the drain discharge groove 146. In this case, the passage surrounded by the drain discharge groove 155 of the switching valve 151 and the drain discharge groove 146 of the switching valve chamber 131 forms an annular shape surrounding the periphery of the switching valve 151, so that the oil can freely flow from the drain discharge recess 154 through the drain discharge recess 154. It can easily flow to the drain discharge hole 147. In this manner, the foreign matter adhering to the filter 114 due to the backflow of the oil is removed to perform the cleaning.
[0110]
On the other hand, as shown in FIG. 18A, the opening of the right auxiliary inflow hole 145B in the switching valve chamber 131 is opened, and a part of the oil flowing into the inflow port 141 passes through the auxiliary inflow hole 145B to the right. It flows into the case 111 of the unit 102. This oil flows together with the oil containing foreign matter, which is pushed by the piston 122 and flows backward from the inside to the outside of the filter 114, flows through the inflow hole 143B of the base block 103, enters the switching valve chamber 131, and switches. From the drain discharge recess 154 of the front closing portion 152 of the valve 151, it flows out to the drain discharge hole 147 of the base block 103 through a passage surrounded by the drain discharge groove 155 of the switching valve 151 and the drain discharge groove 146 of the switching valve chamber 131.
[0111]
Since the flow of oil flowing into the case 111 from the inlet 141 through the auxiliary inflow hole 145B has a strong momentum, the oil flowing backward from the inside to the outside of the filter 114 is drawn by the oil. It flows out to the drain discharge hole 147 vigorously. For this reason, the oil containing foreign matter flowing backward from the inside to the outside of the filter 114 flows smoothly without stagnation, and the filter 114 can be cleaned well.
[0112]
The oil containing foreign matter flows from the drain discharge hole 147 to the outside via the drain discharge valve 148, and further flows to the drain treatment device. When performing cleaning (backwashing), the drain discharge valve 148 is opened.
[0113]
Here, the supply of the compressed air to the cylinder 121 is stopped for a certain period of time, and the piston 102 is stopped at the upper end of the cylinder 121 for a certain period of time. Is stopped, and the compressed air in the cylinder 121 flows backward through the air pipe 163B and the air pipe 164 to be discharged to the outside. As a result, the piston 122 moves down inside the cylinder 121, and rests on the support ring 123 and stops. Thereafter, when the handle 157 is rotated toward the vertical position, the cam 157a is disengaged from the operation member of the switch 162B, and the switch 162B is set to a normal, for example, non-operating state. For this reason, the air valve 161B becomes the non-drive state again and closes again.
[0114]
In this way, the right unit 102 cleans the filter 114 by causing the oil to flow back inside the case 111. In this embodiment, the means for inflowing and outflowing compressed air, which is a pressure fluid, is common.
[0115]
When the handle 157 is rotated from the vertical position to the left side in the figure, for example, by 65 ° as shown in FIG. 15, the filtering operation of the left unit 101 is stopped, and the filtering operation of the right unit 102 is performed. In this case, the position of the switching valve 151 and the flow of the oil are obtained by turning the handle 157 described above from the vertical position to the right side in FIG. As shown in FIG. 15, when the handle 157 is rotated from the vertical position to the left side in the figure, for example, to a horizontal position inclined at 90 °, cleaning (backwashing) is performed by the left unit 101 and filtering operation is performed by the right unit 102. . In this case, the position of the switching valve 151 and the flow of oil are obtained by turning the handle 157 from the vertical position to the right side in FIG.
[0116]
As described above, in this embodiment, the cleaning means is operated by applying a pressure fluid to apply a strong force to the filter to easily and easily remove foreign matter adhering to the filter, while having a simple configuration in which the cleaning means is provided in the case. Two sets of units that can be securely removed can be provided in combination.
[0117]
By making the oil inflow and outflow portions of the two units 101 and 102 common by using a switching valve, the oil inflow portion and the oil inflow portion and the oil inflow portion and the oil inflow portion and the oil inflow portion can be reduced as compared with the case where each of the units 101 and 102 is provided independently. In addition to simplifying the configuration of the outflow portion, the start and stop of the filtration operation of the two units 101 and 102 can be easily performed by operating the switching valve. Then, by combining a circuit for supplying compressed air with this configuration, the operation of the switching valve is combined with the start and stop of the filtering operation for the two units 101 and 102 to perform the cleaning (backwashing) operation. It can be started and stopped.
[0118]
In the fourth embodiment, a case has been described in which two sets of units for filtering oil are provided. However, the present invention is not limited to this, and three or more sets of units may be provided. Also in this case, the inflow means and the outflow means of the oil and the inflow means and the outflow means of the compressed air are configured in common.
[0119]
Therefore, in this embodiment, the filtered fluid inflow means and the filtered fluid outflow means in the plurality of units are common to each unit, and the configurations of the filtered fluid inflow means and the filtered fluid outflow means in the plurality of units are simplified. In addition, the operation of starting and stopping the operation of filtering the fluid to be filtered in each unit can be easily performed. The pressure inflow means for applying the pressure fluid to the cleaning means provided in each of the plurality of units and the pressure fluid outflow means for removing the pressure fluid are commonly used in each unit. The structure of the means can be simplified, and the operation of starting and stopping the operation of cleaning (backwashing) the filter in each unit can be easily performed. By making use of the form in which a plurality of units are provided in combination, the configuration and operation of facilities attached to the units can be greatly simplified as compared with the form in which each unit is provided alone.
[0120]
In addition, by utilizing a form in which a plurality of units are provided in combination, cleaning can be performed without stopping supply (flow) of the fluid to be filtered in a line for flowing the fluid to be filtered.
[0121]
The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. When the fluid to be filtered is flowing from the outer peripheral side to the inner peripheral side of the filter as in the third and fourth embodiments described above, the cylinder and the piston, which are the cleaning means, are connected to the inner circumference of the filter. Side (the downstream side in the flow direction of the fluid to be filtered). When the fluid to be filtered flows from the inner circumference to the outer circumference of the filter, the cylinder and the piston, which are the cleaning means, are mounted on the outer circumference of the filter (the flow direction of the fluid to be filtered). Downstream).
[0122]
【The invention's effect】
According to the filter device of the first aspect of the present invention, the cleaning device is operated by applying a pressurized fluid, thereby applying a strong force to the filter, and having a simple structure in which the cleaning device is provided in the case. Can be easily and reliably removed.
[0123]
According to the filter device of the second aspect of the present invention, the cleaning device is operated by applying a pressurized fluid, thereby applying a strong force to the filter, and having a simple structure in which the cleaning device is provided in the case. Can be provided in combination with a plurality of units that can easily and surely be detached.
[0124]
According to the third aspect of the present invention, the pressure fluid is supplied to the cleaning means composed of an inflatable and contractible bag to expand the cleaning means, and the fluid to be filtered inside the filter is moved in the opposite direction to pass through the filter. , The clogging of the filter can be quickly and strongly removed. Moreover, the means for removing the clogging of the filter has a simple configuration because only the cleaning means consisting of an inflatable and contractible bag body is provided inside the case. Further, the operation for removing the clogging of the filter is easy because it merely supplies the pressure fluid to the cleaning means to expand the cleaning means. Furthermore, since the cleaning means is in a contracted state when filtering the fluid to be filtered, it does not hinder the flow of the fluid to be filtered.
[0125]
Further, since the cleaning means is expanded by using the pressure fluid without directly flowing the pressure fluid into the case to remove the clogging of the filter, the pressure fluid is mixed with the fluid to be filtered inside the case. To prevent deterioration due to mixing of the pressure fluid into the fluid to be filtered.
[0126]
According to the invention of claim 4, the pressure fluid is supplied to the guide member to move the moving member, so that the fluid to be filtered inside the filter is moved in the opposite direction to the flow at the time of normal filtration. , The clogging of the film is removed, so that the clogging of the filter can be quickly and strongly removed. In addition, the means for removing the clogging of the filter is simple in configuration because it merely provides the guide member and the moving member inside the case. Further, the operation for removing the clogging of the filter is very easy because only the pressure fluid is supplied to the guide member to move the moving member.
[0127]
Furthermore, since the moving member is moved by using the pressure fluid without directly flowing the pressure fluid into the case to remove the clogging of the filter, the pressure fluid is mixed with the fluid to be filtered inside the case. To prevent deterioration due to mixing of the pressure fluid into the fluid to be filtered.
[0128]
According to the fifth aspect of the present invention, since the drain discharging means is provided, the foreign matter removed from the filter can be easily taken out of the case.
[0129]
According to the sixth aspect of the present invention, if a filter having a cylindrical shape is used as the filter and the cleaning means is provided inside the filter, the cleaning means forming the bag is inflated by the pressurized fluid to prevent clogging of the filter. The removal effect can be used most effectively.
[0130]
According to the seventh aspect of the present invention, if compressed air is used as the pressure fluid for expanding the cleaning means, the cost of the pressure fluid itself is low and the facility for supplying the pressure fluid is simple and economical.
[0131]
According to an eighth aspect of the present invention, in the filter device according to the second aspect, the fluid to be filtered inflow means and the fluid to be filtered out means in the plurality of units are common to each unit, and the fluid to be filtered inflow means in the plurality of units. In addition to simplifying the configuration of the fluid to be filtered out means, the operation of starting and stopping the operation of filtering the fluid to be filtered in each unit can be easily performed. The pressure inflow means for applying the pressure fluid to the cleaning means provided in each of the plurality of units and the pressure fluid outflow means for removing the pressure fluid are commonly used in each unit. The structure of the means can be simplified, and the operation of starting and stopping the operation of cleaning (backwashing) the filter in each unit can be easily performed. Therefore, the configuration and operation of the equipment attached to the unit can be greatly simplified as compared with the configuration in which each unit is provided alone by utilizing the configuration in which a plurality of units are provided in combination. In addition, by utilizing a form in which a plurality of units are provided in combination, cleaning can be performed without stopping supply (flow) of the fluid to be filtered in a line for flowing the fluid to be filtered.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a filter device according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing the filter device according to the embodiment;
FIG. 3 is a sectional view showing a filter device according to a second embodiment.
FIG. 4 is a sectional view showing a filter device according to a third embodiment.
FIG. 5 is a sectional view showing a filter device according to a third embodiment.
FIG. 6 is a front view showing a filter device according to a fourth embodiment.
FIG. 7 is a plan view showing the filter device according to the embodiment.
FIG. 8 is a bottom view showing the filter device according to the embodiment.
FIG. 9 is a side view of the filter device according to the embodiment with a part cut away.
FIG. 10 is a side view showing the filter device according to the embodiment.
FIG. 11 is a sectional view showing the filter device according to the embodiment.
FIG. 12 is a plan view showing the filter device of the embodiment with the case removed.
FIG. 13 is a view showing a switching valve chamber in the filter device of the embodiment.
FIG. 14 is a view showing a switching valve in the filter device of the embodiment.
FIG. 15 is a view showing a switching operation position of the handle in the filter device of the embodiment.
FIG. 16 is a view showing a switching operation position of a switching valve in the filter device of the embodiment.
FIG. 17 is a view showing a switching operation position of a switching valve in the filter device of the embodiment.
FIG. 18 is a view showing a switching operation position of a switching valve in the filter device of the embodiment.
FIG. 19 is a sectional view showing the flow of the fluid to be filtered in the filter device of the embodiment.
FIG. 20 is a sectional view showing the flow of the fluid to be filtered in the filter device of the embodiment.
FIG. 21 is a sectional view showing the flow of the fluid to be filtered in the filter device of the embodiment.
[Explanation of symbols]
1… Case
2 ... Filter
3. Cleaning means (cleaning means)
11 Case body
12 ... Lid
14. Inflow port (fluid to be filtered)
15 ... Outlet (means for outflow of fluid to be filtered)
16 Drain outlet (drain discharge means)
17 ... Inflow pipe (fluid to be filtered)
18. Outflow pipe (means for outflow of fluid to be filtered)
19 ... Three-way valve (means for inflow of fluid to be filtered)
20 ... Three-way valve (means for outflow of fluid to be filtered)
21 ... Bypass pipe
22 ... Drain discharge pipe (drain discharge means)
23 Drain discharge valve (drain discharge means)
31 ... Retaining ring
32 ... Retaining ring
34… Fixed ring
35 ... inflow port (pressure fluid inflow means)
36 ... Outlet (pressure fluid outflow means)
37 ... inflow pipe (pressure fluid inflow means)
38 ... Outflow pipe (pressure fluid outflow means)
39 ... inflow valve (pressure fluid inflow means)
40 ... Outflow valve (pressure fluid outflow means)
51 guide member (cleaning means)
52: Moving member (cleaning means)
101 ... Right unit
102 left unit
103 ... Table block
111 ... case
114 ... Filter
117 ... Air release valve
121: cylinder (cleaning means, guide member)
122: piston (cleaning means, moving member)
124 support pipe (pressure fluid inflow means)
131 ... switching valve chamber (filtered fluid inflow means, filtered fluid outflow means)
141 ... inflow port (fluid to be filtered)
142 ... outlet (fluid to be filtered out means)
143A ... inflow hole (fluid to be filtered)
143B ... inflow hole (fluid to be filtered)
144A: Outflow hole (fluid to be filtered out means)
144B ... outflow hole (outflow means for fluid to be filtered)
145A: auxiliary inflow hole (fluid to be filtered)
145B: auxiliary inflow hole (fluid to be filtered)
146 drain drain groove (drain discharge means)
147 drain drain hole (drain discharge means)
148 drain drain valve (drain discharge means)
151 ... switching valve (filtration target fluid inflow means, filtration target fluid outflow means)
152 ... front part
152a: front closing part
153 ... rear
153a: Rear closing part
154: Drain discharge recess (drain discharge means)
155: drain discharge groove (drain discharge means)
157 ... handle
157a ... Cam
161A ... air valve (pressure fluid inflow means, pressure fluid inflow means)
161B ... air valve (pressure fluid inflow means, pressure fluid inflow means)
162A ... Switch
162B ... Switch
163A: air pipe (pressure fluid inflow means, pressure fluid inflow means)
163B ... air pipe (pressure fluid inflow means, pressure fluid inflow means)
164: air pipe (pressure fluid inflow means, pressure fluid inflow means)
O: Cleaning position
P: Standby position

Claims (8)

A case, a filtered fluid inflow means for flowing the fluid to be filtered into the case, a filtered fluid outflow means for flowing the filtered fluid inside the case to the outside, and a fluid to be filtered provided inside the case. A filter that captures foreign substances contained in the fluid to be filtered while passing through the inside of the case, and moves in the opposite direction by applying force to the fluid to be filtered provided inside the case and inside the case. Cleaning means for removing foreign matter adhering to the filter by passing the filter, pressure fluid inflow means for applying a pressure fluid to the cleaning means, and removing pressure fluid acting on the cleaning means provided in the case. A filter device comprising: a pressure fluid outlet means. A case, a filter provided inside the case, which captures foreign matter contained in the fluid to be filtered while passing through the inside of the case during the flow of the fluid to be filtered, and a filter provided inside the case, which is provided inside the case. A plurality of units configured as a single unit by combining cleaning means for applying a force to the fluid to move the filter in the opposite direction to pass through the filter and remove foreign matter attached to the filter; A fluid-to-be-filtered means for injecting the fluid-to-be-filtered into each case; a fluid-to-be-filtered outflow means for allowing the fluid to be filtered inside each of the cases to flow out to the outside; Pressure fluid inflow means for applying pressure fluid and pressure fluid outflow means for removing pressure fluid acting on each cleaning means of the plurality of units Filter device characterized by comprising a. The cleaning means is provided on the downstream side in the flow direction of the fluid to be filtered with respect to the filter inside the case and forms an inflatable and contractible bag body, and applies a force to the fluid to be filtered inside the case when inflated. Moving the filter in the opposite direction to pass through the filter to remove foreign matter attached to the filter,
The pressure fluid inflow means is provided in the case and allows the cleaning means to expand by flowing a pressure fluid into the cleaning means, and the pressure fluid outflow means is provided in the case and is provided with the cleaning means. The filter device according to claim 1, wherein a pressure fluid is caused to flow out from the inside to contract the cleaning unit. The cleaning means is provided downstream of the filter in the flow direction of the fluid to be filtered inside the case, and moves the guide member and the fluid to be filtered inside the case in the opposite direction by applying force. A moving member supported by the guide member so as to move between a cleaning position where the foreign matter adhered to the filter is removed by passing through the filter and a standby position deviated from the cleaning position; It is receiving a force toward the standby position by the fluid to be filtered inside,
The pressure fluid inflow means is provided in the case, and allows the pressure fluid to flow into the guide member to apply a force to the moving member to move the moving member from the standby position to the cleaning position. The filter device according to claim 1, wherein the fluid outflow unit is configured to cause the pressure fluid to flow out of the guide member. The filter device according to any one of claims 1 to 4, further comprising a drain discharge unit configured to discharge drain inside the case. The filter device according to any one of claims 1 to 4, wherein the pressure fluid is compressed air. The filter device according to claim 1, wherein the filter has a cylindrical body, and the cleaning unit is disposed on an inner peripheral side of the filter. The fluid-to-be-filtered inflow means and the fluid-to-be-filtered outflow means are common to the units, and the pressure fluid inflow means and the pressure fluid outflow means are common to the units. The filter device according to claim 2.

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