JP2808538B2 - Clogging detection device for liquid filtration filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting clogging of a filter for liquid filtration, which is provided in a pipe for supplying liquid, for detecting clogging of a filter for liquid filtration.

[0002]

2. Description of the Related Art Conventionally, filter clogging is supposed based on the operating time or the amount of flowing water set based on experience or the like.
In general, the filter was repaired or replaced.
In this method, in order to use the set use time or the amount of flowing water as a reference, the inconvenience of not performing repair etc. even if the required flow rate can not be obtained due to clogging of the filter, or repairing even if clogging has not occurred Wasted.

[0003] As shown in the piping diagram of FIG. 3 , a bypass pipe 44 provided with a differential pressure gauge 43 in parallel with the filter 41 is provided in a pipe 42 in which the filter 41 is mounted. When the pressure difference between the front and rear pipes reached a preset pressure difference, it was also determined that the filter 41 was clogged. In the structure shown in FIG. 3, when the pressure on the upstream side of the filter 41 increases,
Although the flow rate increases, the pressure difference between the pipes before and after the filter 41 also increases. For this reason, it is determined that the filter 41 is clogged even though the required flow rate is obtained, and the filter 41 is unnecessarily repaired or replaced.

Next, when the pressure on the upstream side of the filter 41 decreases, the flow rate decreases, but the pressure difference between the pipes before and after the filter 41 also decreases. For this reason, although the required flow rate has not been obtained, inconveniences such as not determining that clogging has occurred and not performing repair or replacement of the necessary filter 41 have occurred. The same occurs when the pressure downstream of the filter 41 decreases or increases.

Further, when the filter is clogged on the basis of the set use time or the amount of flowing water,
The increased pressure differential across the pipe of the filter 41 as shown in FIG. 3 may detect clogging of the filter, the flow rate just before such cleaning of the filter is to be a required flow rate, repair, etc. Immediately after performing the above, the flow rate becomes extremely large due to the small flow resistance of the filter, which causes inconveniences such as damaging the filter and shortening the life.

[0006]

According to the present invention, even if the above-mentioned conventional method for assuming or detecting clogging of a filter is clogged so that a required flow rate cannot be obtained, it can be assumed. Is not determined, clogging is determined even if the required flow rate is obtained, clogging is not determined despite the required flow rate is not obtained, or the flow rate immediately after repairs etc. is too large The object of the present invention is to solve problems such as damaging the filter and shortening its life, and to achieve these objects with a simple device.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a liquid filtration filter mounted on a pipe, and a liquid flow sensor and an electric ball valve on the secondary side of the liquid filtration filter. The flow rate control valve for liquid using the like is mounted in series, the flow rate sensor and the flow rate control valve are respectively connected to a flow rate controller, and the flow rate controller allows a predetermined flow rate to flow at an intermediate opening degree. While having a constant flow rate function to keep the flow rate of the pipe at a preset flow rate while adjusting the set flow rate control valve in the fully open direction in accordance with the progress of clogging of the liquid filtration filter, it is adjusted only in the fully open direction. The clogging signal is issued when the opening degree of the flow control valve reaches the fully opened state and the predetermined flow rate cannot be maintained. Ri out a broadcast signal to detect the clogging of the liquid filtration filter configured to broadcast.

[0008]

According to the present invention, a controller for controlling a flow rate controls a flow rate control valve, which is set to flow at a predetermined flow rate at an intermediate opening, based on flow rate information received from a flow rate sensor so as to maintain a flow rate in a pipe at a preset flow rate. An operation having a constant flow rate function is performed by adjusting the filter in the fully open direction in accordance with the progress of clogging of the filter for filtration. By this action, when the filter is not clogged, the flow resistance of the filter tends to be small and the flow tends to increase. Therefore, the opening of the flow control valve is reduced, and as the filter is clogged, the flow control valve Is increased only in the full opening direction.

A clogging signal is issued when the opening of the flow control valve adjusted to the fully opened direction reaches the fully opened state and the predetermined flow cannot be maintained. Upon receipt of this signal, the controller for flow control issues a notification signal to detect clogging of the filter for liquid filtration, and emits or displays sound or light based on the detection signal to provide notification. Also, by using this detection signal, other devices can be operated in conjunction with each other, or an alarm can be issued at a distant place.

In this apparatus, the flow rate is maintained at a preset flow rate regardless of the clogged state of the filter.
Excessive flow does not damage the filter or the like, shortening the service life, or preventing the required flow from being obtained and causing no inconvenience. In addition, there is no need to notify that clogging is occurring even when the required flow rate is obtained, or to notify clogging when the required flow rate is not obtained, and thus no waste or inconvenience is caused.

[0011]

FIG. 1 is a front view showing an embodiment of a clogging detecting device for a liquid filtration filter according to the present invention, wherein 1 is a liquid filtration filter, 2 is a pipe for feeding liquid, 3 is a liquid flow sensor, 4 is a liquid flow control valve, 5 is a flow control controller, and 6 and 7 are electrical connections. In FIG. 1, a flow sensor 3 and a flow control valve 4 are mounted in series on the secondary side of a liquid filtration filter 1 provided in the middle of a pipe 2.
Is an electric ball valve, the opening of which is adjusted by the action of a flow control controller 5 through an electric connection 7, and the controller 5 controls the flow control valve 4 based on the flow rate information received through the connection 6 from the flow sensor 3. It has a constant flow rate function of adjusting the opening to keep the flow rate in the pipe 2 at a preset flow rate. Further, the controller 5 emits, for example, sounds or light as clogging of the liquid filtering filter 1 when the flow rate cannot be maintained at a preset flow rate when the opening degree of the flow rate control valve 4 is fully opened. It is configured to display and inform.

In FIG. 1, the flow direction of the pipe 2 is from left to right as shown by the arrow in the figure, and the arrangement order of the filter 1, the flow sensor 3 and the flow control valve 4 is as follows.
It is the arrangement shown in FIG. Further, the controller 5 may be integrated with the flow sensor 3 or the flow control valve 4. Note that, other than the above example, the flow sensor 3 may be disposed downstream of the flow control valve 4.

In FIG. 2, a flow sensor 33 and a flow control valve 34 are mounted in series on a pipe 32 on which a filter 31 is mounted, and the flow sensor 33 and a controller 35 are connected.

Next, based on the embodiment shown in FIG.
The operation will be described. Inside the pipe 2 by the liquid flow sensor 3
Flow rate, and this flow rate information is
Controller 5 and the controller 5
Through the connection 7 based on the opening information of
Opening of liquid flow control valve 4 set to constant flow
To the full open direction, and the filter for liquid filtration 1 is clogged.
If not, the flow resistance of the filter 1 is small.
To reduce the opening of the flow control valve 4, and the flow rate here
As the resistance increases and the clogging of filter 1 increases,
As the flow resistance of the filter 1 increases gradually,
By gradually increasing the opening of the control valve 4 only in the full opening direction,
Reduce the flow resistance here and set the flow rate in the pipe 2 in advance
The flow rate is maintained.

The controller 5 for controlling the flow rate is
Thus, when the opening of the flow control valve 4 is fully open, the flow rate is
When it is no longer possible to maintain the set flow rate,
Filter 1 is detected as clogged, and this detection signal
Notify by emitting or displaying sound or light.

[0016] The liquid filtration filter shown in each of the above examples
The (filter) filters the liquid fluid as described above.
When installing a filter in the middle of piping,
Applicable to ruta.

[0017]

The eyes of the filter for liquid filtration according to the present invention.
The clogging detection device has a predetermined flow rate (for example,
20 liters / min) and clogging
Notify or clogging even if the specified flow rate is not obtained
The filter is not repaired or
Only when you need to do an exchange, etc.
Always inform the clogging at certain times, so waste and inconvenience
Reliable and stable clogging with no risk of coalescence
Signal can be obtained, and the notification when replacing the filter is accurate
It is. What is the clogged state of the filter for liquid filtration?
Regardless, the constant flow rate function keeps the flow rate at the preset flow rate
Liquid filtration with excessive flow rate
The life of the filter will not be shortened due to damage to the filter. Change
Since the applied fluid is a liquid and an incompressible fluid,
When the flow control valve is fully opened
Only when it has reached the specified flow rate
Because it is good, it is possible to reliably detect with simple control.
Low cost and durable filter for liquid filtration
A clogging detection device can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a clogging detection device for a liquid filtration filter according to the present invention.

FIG. 2 is a piping diagram for explaining an example of a filter clogging detection device according to the present invention.

FIG. 3 shows an example of a conventional filter clogging detection device.
It is a piping diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter for liquid filtration 2 Piping 3 Flow sensor for liquid 4 Flow control valve for liquid 5 Controller for flow control

Claims (1)

(57) [Claims] 1. A filter for liquid filtration is attached to a pipe,
Of a flow control valve for the liquid using the liquid for flow sensor and electric ball valve or the like is mounted in series with the secondary side of the liquid filtration filter, the flow sensor and flow control valve it
Connected to the controller for flow rate control, and the controller for flow rate control allows the specified flow rate to flow at the intermediate opening.
The flow control valve set to
It has a constant flow rate function that keeps the flow rate of the piping at a preset flow rate while adjusting it in the full opening direction according to the progress of clogging of the filter, and the opening degree of the flow control valve that is adjusted only in the full opening direction Has reached the fully opened position and the specified flow rate cannot be maintained.
A clogging signal is issued to the liquid, and the flow control controller receiving the signal outputs a notification signal to detect and notify the clogging of the liquid filtration filter. Clogging detection device for filtration filter.