JP4830872B2 - Filtration device - Google Patents

Description

  The present invention relates to a filtration device that filters various liquids.

  Filtration devices for filtering various liquids are widely used in the food and industrial fields. In such a filtration device, the filter is clogged by continuing filtration for a long time. In such a case, it is troublesome to remove and clean the filter or replace it with a new filter. In order to save this time and effort, clogging has been conventionally eliminated by performing reverse cleaning without removing the filter from the filtration device.

  For example, in the filtration device described in Patent Document 1, a pump and a plurality of bypass flow paths are provided in a flow path connecting a liquid supply source side and a supply destination side, and two filters are provided on the flow path. By controlling the opening and closing of the plurality of valves provided, while the liquid is passed through one filter in the forward direction and filtered, a part of the filtered liquid is passed through the other filter in the reverse direction. When backwashing is performed, if one of the filters becomes clogged, the liquid is passed through the other filter in the forward direction for filtration, and part of the filtered liquid is passed through the one filter in the reverse direction. Back washing is performed.

However, in the above prior art, even if the reverse cleaning of the other filter is completed while filtering with one filter, a part of the filtered liquid is passed through the other filter in the reverse direction. Therefore, extra driving force is consumed by the pump. In addition, since it is necessary to provide two filters, the apparatus is increased in size and cost. Furthermore, in order to smoothly switch the flow path, complicated control is required for the timing of opening and closing the plurality of valves, and the control operation becomes complicated.
Japanese Patent Application Laid-Open No. 2004-57983

  The present invention has been made in view of the above points, and provides a filtration device capable of backwashing a filter and reducing the size of the device, reducing the cost, and facilitating switching control. The purpose is to provide.

The filtration device according to the present invention includes a storage container 2a for storing the liquid 1 before filtration as the supply source 2 of the liquid 1 to be filtered, and a supply container 3a for supplying the liquid 1 after filtration as the supply destination 3 of the liquid 1. When a main channel 4 which connects the supply destination 3 and the source 2, a filter 5 for filtering the liquid 1 that flows through the main passage 4, to a source 2 side or supply destination 3 side of the filter 5 A flow switching means 6 that supplies a driving force for the flow of the liquid 1 in the main flow path 4 and switches the flow direction of the liquid 1, and a supply source than the filter 5 and the flow switching means 10 of the main flow path 4; A discharge path 13 branched from the second side , and the flow switching means 6 is provided on the main flow path 4 and supplies a driving force to the liquid 1 from the supply source 2 side to the supply destination 3 side. , Branched from the main flow path 4 so as to straddle the drive source 7 The main flow path 4 is branched from the main flow path 4 so as to straddle the bypass flow path 8 and the drive source 7, and the branch positions of the main flow path 4 and the first bypass flow are respectively on the supply source 2 side and the supply destination 3 side with respect to the drive source 7. A second bypass passage 9 disposed on the side of the supply destination 3 with respect to the branching position with respect to the passage 8, and the flow of the liquid 1 in the first bypass passage 8 and the second bypass passage 9 is prevented. The forward direction allowing the flow of the liquid 1 between the branch positions of the bypass flow paths 8 and 9 and the main flow path 4 on the upstream side and the downstream side of the drive source 7, respectively, the first bypass flow path 8 and the second bypass flow path 8 The flow of the liquid 1 in the bypass flow path 9 is allowed and the flow of the liquid 1 between the branch positions of the bypass flow paths 8 and 9 and the main flow path 4 is prevented on the upstream side and the downstream side of the drive source 7 respectively. the first flow path opening and closing means 1 for switching the direction opposite state Comprises a, in the forward state allows the flow of the liquid 1 in the main channel 4 at the source 2 side than the branch position of the discharge passage 13 while preventing the flow of the liquid 1 at the discharge path 13, the In the reverse direction, the second flow path opening / closing means 12 that allows the flow of the liquid 1 in the discharge path 13 and prevents the flow of the liquid 1 in the main flow path 4 on the supply source 2 side of the branch position with respect to the discharge path 13. It is characterized by comprising .

In the filtration device according to the present invention, it is preferable that the flow switching means 6 automatically switches between the forward direction state and the reverse direction state.

The filtration device according to the present invention performs a series of operations in which the flow switching unit 6 switches from the forward state to the reverse state every time a predetermined time elapses and then switches to the forward state again. It is preferable .

In addition, the filtration device according to the present invention includes a pressure sensor 11 that measures the pressure applied from the liquid 1 to the filter 5, and the flow switching means 6 has a predetermined detection value in the pressure sensor 11 in the forward state. In the case of exceeding, it is preferable to perform a series of operations for switching from the forward state to the reverse state and then switching to the forward state again.

Further, the filtration device according to the present invention includes a pressure sensor 11 that measures the pressure applied from the liquid 1 to the filter 5, and the flow switching means 6 detects the detection result in the pressure sensor 11 in the forward direction every predetermined time. When the value exceeds a predetermined value, a series of operations for switching from the forward direction state to the reverse direction state and then switching to the forward direction state is performed again, and the detection result in the pressure sensor 11 in the forward direction state is predetermined. It is preferable that the series of operations is performed even when the value is exceeded.

In addition, the filtration device according to the present invention includes a pressure sensor 11 that measures the pressure applied from the liquid 1 to the filter 5, and the flow switching means 6 has a predetermined detection value in the pressure sensor 11 in the forward state. When it exceeds, it switches from the forward direction state to the reverse direction state, and then performs a series of operations to switch back to the forward direction state, and also performs the above series of operations even when the forward direction state continues for a predetermined time It is preferable that

The filtration device according to the present invention performs filtration by allowing the liquid 1 to flow through the main flow path 4 from the supply source 2 toward the supply destination 3 side by the driving force of the drive source 7 while passing through the filter 5 in the forward direction. In the reverse direction, the liquid 1 flows through the main flow path 4 from the supply destination 3 side toward the supply source 2 side by the driving force of the drive source 7, and the liquid 1 flows in the direction opposite to the forward direction during that time. The filter 5 can be back-washed by passing through the filter , and the back-cleaning liquid is discharged through the discharge path 13, so that the filter 5 that has been clogged efficiently can be back-washed with a simple configuration. Thus, the filtration capacity can be recovered, and the size and cost of the apparatus can be reduced, and the switching control can be facilitated.

Further, when the distribution switching means 6 automatically switches between the forward state and the reverse direction, the filtering capability is automatically controlled without human monitoring of the degree of clogging of the filter 5. It is something that can be recovered.

In addition, when the distribution switching unit 6 performs a series of operations for switching from the forward state to the reverse state every time a predetermined time elapses and then switching to the forward state again, it is automatically performed at regular intervals. In addition, the filter 5 can be back-washed, so that the filtration capacity can be maintained.

Further, a pressure sensor 11 for measuring the pressure applied from the liquid 1 to the filter 5 is provided, and the flow switching means 6 is in a forward state when a detection result in the pressure sensor 11 in the forward state exceeds a predetermined value. When a series of operations for switching to the forward state is performed again after switching from the reverse state to the reverse state , the filter 5 is automatically backwashed whenever the degree of clogging of the filter 5 exceeds a certain range. Thus, the filtration capacity can be maintained.

In addition, a pressure sensor 11 that measures the pressure applied from the liquid 1 to the filter 5 is provided, and when the flow switching means 6 has a detection result in the pressure sensor in a forward state exceeding a predetermined value every predetermined time, After switching from the forward direction state to the reverse direction state, a series of operations to switch back to the forward direction state is performed, and also when the detection result in the pressure sensor 11 exceeds a predetermined value in the forward direction state, the series is performed. when it performs the operation, while performing the automatic backflushing of the filter 5 at regular intervals in time control, when the degree of eye filter 5 clogged is increased due to unforeseen circumstances such as Further, back washing can be performed, and the filtration capacity can be maintained more reliably.

In addition, a pressure sensor 11 that measures the pressure applied from the liquid 1 to the filter 5 is provided, and the flow switching unit 6 starts from the forward state when the detection result in the pressure sensor 11 in the forward direction exceeds a predetermined value. After switching to the reverse state, a series of operations for switching back to the forward state is performed, and when the above-described series of operations is performed even when the forward state continues for a predetermined time , the filter 5 Whenever the degree of clogging exceeds a certain range, the filter 5 is automatically backwashed, and the time control is also used to maintain the filtration capacity more reliably, and the increase in the frequency of backwashing is suppressed. The efficiency of the filtering operation can be improved.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  In the illustrated embodiment, a storage container 2 a that stores the liquid 1 before filtration is provided as the supply source 2 of the liquid 1, and a supply container 3 a that is supplied with the filtered liquid 1 is provided as the supply destination 3 of the liquid 1. ing. The storage container 2a and the supply container 3a are connected by a single main channel 4 which is a channel through which the liquid 1 flows.

  The main flow path 4 is provided with a filter 5 and a flow switching means 6 in the middle of the flow path.

  In providing the filter 5, for example, a filter 18 composed of a hollow container in which the filter 5 is housed can be provided in the middle of the main flow path 4.

  The distribution switching means 6 may be provided on either the supply source 2 side or the supply destination 3 side with respect to the filter 5, but is provided on the supply source 2 side in the illustrated example. The flow switching means 6 includes a drive source 7 such as a pump, a first bypass flow path 8, a second bypass flow path 9, and a flow path opening / closing means 10 (first flow path opening / closing means 10) including a plurality of valves. It consists of A control unit 20 for controlling the distribution switching unit 6 is also provided.

  The driving source 7 is provided in the main flow path 4 and supplies driving force from the supply source 2 side to the supply destination 3 side to the liquid 1 at the installation position thereof, and is configured by an appropriate device such as a pump as described above. Is done.

  The first bypass channel 8 and the second bypass channel 9 are both branched from the main channel 4 and provided so as to straddle the drive source 7 between the supply source 2 side and the supply destination 3 side. Hereinafter, the branch position on the supply source 2 side from the drive source 7 between the first bypass flow path 8 and the main flow path 4 is the upstream first branch 14, and the branch position on the supply side from the drive source 7 is the downstream first. The branch position on the supply source 2 side from the drive source 7 between the second bypass flow path 9 and the main flow path 4 is a branch position on the supply side from the upstream second branch 16 and the drive source 7. Is referred to as downstream second branch 17. The upstream first branch 14 is provided closer to the supply source 2 than the upstream second branch 16, and the downstream first branch 15 is provided closer to the supply source 2 than the downstream second branch 17.

  The first flow path opening / closing means 10 prevents the flow of the liquid 1 in the first bypass flow path 8 and the second bypass flow path 9, and between the upstream first branch 14 and the upstream second branch 16 and the downstream first. The state in which the liquid 1 is allowed to flow between the branch 15 and the downstream second branch 17 (forward direction state, see FIG. 1), and the respective liquids in the first bypass channel 8 and the second bypass channel 9 1 in which the flow of the liquid 1 is allowed and the flow of the liquid 1 between the upstream first branch 14 and the upstream second branch 16 and between the downstream first branch 15 and the downstream second branch 17 is prevented (reverse direction state, 2). The first flow path opening / closing means 10 can be constituted by a plurality of valves provided at appropriate positions, and the flow of the liquid 1 can be switched by performing opening / closing control of the valves.

  The installation position of the valve can be an appropriate position that can be switched between the forward state and the reverse state as described above. However, in the illustrated example, the opening / closing valve ( Bypass first valve 10a), on-off valve provided in second bypass flow path 9 (bypass second valve 10b), open / close provided between upstream first branch 14 and upstream second branch 16 in main flow path 4 Four on-off valves, that is, a valve (main flow path first valve 10c) and an open / close valve (main flow path second valve 10d) provided between the downstream first branch 15 and the downstream second branch 17 in the main flow path 4 are provided. It has been. In this case, the bypass first valve 10a and the bypass second valve 10b are closed and the main flow path first valve 10c and the main flow path second valve 10d are closed to obtain a forward state as shown in FIG. The bypass first valve 10a and the bypass second valve 10b are opened, and the main flow path first valve 10c and the main flow path second valve 10d are closed so as to be in the reverse direction as shown in FIG. Can do. Of course, the type, number and installation position of the valves are not limited to those described above. For example, a three-way valve may be installed in each of the upstream first branch 14, the upstream second branch 16, the downstream first branch 15, and the downstream second branch 17.

  Moreover, you may provide the discharge path 13 branched from the main flow path 4 like illustration. The branch position of the discharge path 13 from the main flow path 4 (hereinafter referred to as a discharge path branch 19) is located closer to the supply source 2 than the filter 5 and the flow switching means 6, and in the illustrated example, It is the supply source 2 side. At this time, in the forward direction state, the flow of the liquid 1 in the discharge path 13 is blocked and the flow of the liquid 1 in the main flow path 4 on the supply source 2 side with respect to the discharge path branch 19 is allowed. Then, the flow path opening / closing means 12 (second flow path opening / closing means 12 that permits the flow of the liquid 1 in the discharge path 13 and prevents the flow of the liquid 1 in the main flow path 4 on the supply source 2 side of the discharge path branch 19. ). The second flow path opening / closing means 12 can be constituted by a valve provided at an appropriate place, for example, by a three-way valve 12a provided at the discharge path branch 19 as shown in the figure. In this case, in the forward direction state, only the flow of the liquid 1 between the supply source 2 side and the supply destination 3 side of the main flow path 4 in the discharge path branch 19 is opened by the three-way valve 12a, and in the reverse direction state, the three-way valve 12a Thus, only the flow of the liquid 1 between the discharge path 13 side in the discharge path branch 19 and the supply destination 3 side of the main flow path 4 is opened.

  In the filtering device A having the above configuration, in the forward state, as shown in FIG. 1, the liquid 1 stored in the supply source 2 flows through the main flow path 4 toward the supply destination 3 side by the driving force of the driving source 7. In the meantime, it is filtered by passing through the filter 5, and the filtered liquid 1 is supplied to the supply destination 3. In the reverse state, as shown in FIG. 2, the liquid 1 of the supply destination 3 flows through the main channel 4 toward the source 2 and flows into the second bypass channel 9 from the downstream second branch 17. After that, the main channel 4 flows from the upstream second branch 16 to the downstream first branch 15, flows into the first bypass channel 8, and flows through the main channel 4 from the upstream first branch 14 to the supply source 2. In this way, the liquid 1 flows from the supply destination 3 toward the supply source 2, and at this time, the liquid 1 passes through the filter 5 in the direction opposite to the forward state. For this reason, when the filter 5 is clogged, it is back-washed and the capability of the filter 5 is restored. In addition, when the discharge path 13 is provided at this time, the liquid 1 containing a large amount of substances that cause clogging after being used for backwashing is discharged through the discharge path 13 without being returned to the supply source 2. The

  The control unit 20 controls the first flow path opening / closing means 10 and the second flow path opening / closing means 12, and is constituted by a microcomputer, for example. This control part 20 switches between the said forward direction state and a reverse direction state by transmitting a control signal to the valve which each comprises the 1st flow path opening / closing means 10 and the 2nd flow path opening / closing means 12. This switching can be performed by automatic control by the control unit 20. Although this automatic control can be performed by an appropriate method, for example, it can be performed by time control or pressure control.

  In the case of performing switching by time control, for example, a series of operations (hereinafter, reverse) that switches from the forward state to the backward state and then switches to the forward state again at predetermined time stored in advance in the control unit 20. The controller 20 controls the first flow path opening / closing means 10 and the second flow path opening / closing means 12 so as to perform a cleaning operation. That is, the liquid 1 is first filtered in the forward direction, and when a predetermined time has passed in this state, the control unit 20 controls the first flow path opening / closing means 10 and the second flow path opening / closing means 12 to set the reverse direction state. After performing the reverse cleaning of the filter 5, the control unit 20 further controls the first flow path opening / closing means 10 and the second flow path opening / closing means 12 to switch to the forward state, and the liquid 1 is filtered again. By repeating this operation, the filter 5 can be back-washed every predetermined time to maintain the filtering ability. The predetermined time can be appropriately set so that the filter 5 is not clogged excessively, and switching from the reverse state to the forward direction has been performed, for example, an appropriate set time that allows sufficient backwashing has elapsed. Switch at the point.

  When pressure control is performed, a pressure sensor 11 that measures the pressure of the liquid 1 on the supply source 2 side of the filter 5 in the forward direction is provided. The pressure sensor 11 can be provided, for example, in a space on the supply source 2 side with respect to the filter 5 in the filter 18. The detection result by the pressure sensor 11 is transmitted to the control unit 20. When the detection result by the pressure sensor 11 exceeds a predetermined value stored in advance in the control unit 20, the control unit 20 controls the first flow path opening / closing means 10 and the second flow path opening / closing means 12, Perform reverse cleaning operation. In this way, only when the pressure sensor 11 detects that the degree of clogging of the filter 5 exceeds a certain range, the filter 5 can be back-washed, and the filter 5 performance can always be increased. It can be maintained within a certain range. The predetermined value is appropriately set so that the filter 5 is not clogged excessively. Further, switching from the reverse direction state to the forward direction state is performed, for example, at a time when an appropriate set time capable of sufficient reverse cleaning has elapsed.

  Further, switching between the forward state and the reverse state may be performed by using both time control and pressure control. For example, under the control of the control unit 20, the reverse cleaning operation is performed every predetermined time T 1, and the detection result by the pressure sensor 11 in the forward direction exceeds a predetermined value stored in the control unit 20 in advance. In this case, the reverse cleaning operation is further performed even when the switching time is not controlled by the time control. FIG. 3A shows an example of such an operation in time series, where ● represents a reverse cleaning operation by time control, and □ represents a cleaning operation by pressure control. In this case, even when the filter 5 is suddenly clogged due to an unforeseen situation or the like during the switching control by the time control, the filter 5 is additionally back-washed each time. And the filtration performance can be maintained.

  Further, switching control by pressure control is performed by the control unit 20, and when the forward state continues for a predetermined time T2, switching control is performed by the control unit 20 regardless of the detection result of the pressure sensor 11. You may make it do. That is, the switching operation by the time control is not performed every predetermined time as in the case of FIG. 3A, but is performed based on the duration of the forward state. FIG. 3B is an example showing such an operation in time series, where ● represents a reverse cleaning operation by time control, and □ represents a cleaning operation by pressure control. If it does in this way, the frequency increase of the back washing | cleaning by using time control together can be suppressed, and efficiency of filtration operation can be achieved while maintaining filtration performance.

  Such a filtration device A can be used in a wide range of fields such as the food field and the industrial field. As an example, the filtration device A is a resin varnish used when producing a prepreg used for manufacturing a printed wiring board. Application to filtration treatment is mentioned. Such a resin varnish often contains a powdery inorganic filler, but if the inorganic filler contains coarse particles, the insulation reliability of the printed wiring board may be reduced. Therefore, this is filtered. In such filtration of the resin varnish, not only the filter 5 is clogged by coarse particles, but also the gelled resin in the resin varnish may adhere to the filter 5 and cause clogging. The occurrence frequency of clogging is high, and therefore, the contribution of maintaining the filtration performance by back washing of the filter 5 using the filtration device A as described above is large.

It is the schematic which shows the forward direction state in an example of embodiment of this invention. It is the schematic which shows a reverse direction state same as the above. (A) And (b) is an explanatory view showing the interval of backwashing operation in time series when time control and pressure control are used together.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid 2 Supply source 3 Supply destination 4 Main flow path 5 Filter 6 Flow switching means 7 Drive source 8 First bypass flow path 9 Second bypass flow path 10 Flow path opening / closing means (first flow path opening / closing means)
11 Pressure sensor 12 Channel opening / closing means (second channel opening / closing means)
13 Discharge channel

Claims (6)

A reservoir for storing the liquid before filtration as a source of liquid be filtered, a main channel that connects the supply container of liquid after filtration as a supply destination of the liquid supplied, and the supply destination and the source A filter for filtering the liquid flowing through the main flow path, and a supply source side or a supply destination side of the filter for supplying a driving force for flowing the liquid in the main flow path and switching the flow direction of the liquid Comprising a flow switching means, and a discharge channel branched from the supply source side of the main flow path filter and the flow switching means ,
The flow switching means is provided on the main flow path for supplying a driving force to the liquid from the supply source side to the supply destination side; a first bypass flow path branched from the main flow path so as to straddle the drive source; The main flow path is branched so as to straddle the drive source, and the branch position is arranged closer to the supply destination than the branch position of the main flow path and the first bypass flow path on the supply source side and the supply destination side with respect to the drive source. The second bypass flow path, and the liquid flow in the first bypass flow path and the second bypass flow path is blocked, and each of the bypass flow paths and the main flow path are respectively located upstream and downstream of the drive source. A forward state allowing the flow of liquid between the branch positions, and allowing the flow of liquid in the first bypass flow path and the second bypass flow path, and each bypass flow path on the upstream side and the downstream side of the drive source, respectively. And the main flow path Comprises a first flow path opening and closing means for switching between a backward state to prevent the flow of fluid between the branch position,
In the forward state, the flow of liquid in the discharge path is prevented and the flow of liquid in the main flow path on the supply source side with respect to the branch position with respect to the discharge path is allowed, and in the reverse direction, the flow of liquid in the discharge path And a second flow path opening / closing means for preventing liquid from flowing in the main flow path on the supply source side relative to the branch position with respect to the discharge path .   The filtration device according to claim 1, wherein the distribution switching means automatically switches between a forward direction state and a reverse direction state.   3. The distribution switching unit according to claim 2, wherein the distribution switching unit performs a series of operations for switching from the forward direction state to the reverse direction state every time a predetermined time elapses, and then switching to the forward direction state again. Filtration device.   A pressure sensor for measuring the pressure applied to the filter from the liquid, and the flow switching means switches from the forward state to the reverse state when the detection result of the pressure sensor in the forward direction exceeds a predetermined value. 3. The filtering apparatus according to claim 2, wherein a series of operations for switching to a forward state is performed again later.   A pressure sensor for measuring the pressure applied from the liquid to the filter, and the flow switching means reverses from the forward state when the detection result of the pressure sensor in the forward direction exceeds a predetermined value every predetermined time. After switching to the state, a series of operations for switching back to the forward direction is performed, and also when the detection result of the pressure sensor exceeds a predetermined value in the forward direction, the series of operations is performed. The filtration apparatus according to claim 2, wherein   A pressure sensor for measuring the pressure applied from the liquid to the filter, and the flow switching means switches from the forward state to the reverse state when the detection result of the pressure sensor in the forward direction exceeds a predetermined value. 3. The filtration device according to claim 2, wherein the filter device performs a series of operations for switching to the forward direction again, and performs the series of operations even when the forward state continues for a predetermined time. .

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