JP2023036226A - Filter device - Google Patents

Abstract

To provide a filter device capable of surely grasping occurrence of clogging in filtering means of a strainer or the like at appropriate timing.SOLUTION: A valve body 4 provided in a valve chamber 5 of a check valve 10 is opened when steam and drain flow in a forward direction 91, and is closed to function as a check valve when the steam and the drain flow reversely in a backward direction 92. The valve chamber 5 is provided with a strainer 2 together with the valve body 4 to capture a mixed foreign matter by filtering the steam and the drain, but when clogging occurs, it turns in the direction of an arrow 95 to pass the steam and the drain through. A Hall element 8 detects a change in a magnetic field of a magnet 6 provided in the strainer 2, and a control part 41 calculates an opening degree of the strainer 2. If a state in which the opening degree of the strainer 2 is equal to or more than 30% continues for a constant time, the control part 41 determines that clogging occurs in the strainer 2, and displays the occurrence of the clogging on a monitor 42.SELECTED DRAWING: Figure 1

Description

The filtering device according to the present application relates to technology of a filtering device having filtering means such as a strainer for trapping foreign substances in fluid.

Devices with filtering devices include check valves, for example. A check valve is a valve that is provided in a fluid flow path and has a mechanism that prevents reverse flow due to back pressure of the fluid. For example, a pipe installed in an industrial plant transfers high-temperature, high-pressure steam, and in this pipe, along with the steam, drain (condensed water) generated from the steam flows in a predetermined direction (forward direction).

In order to prevent backflow of such steam and drain, check valves are provided at necessary locations on the piping. Check valves have various structures, and swing type check valves, lift type check valves, spring disk type check valves, and the like are known.

By the way, steam and drain often contain foreign matter such as rust and scale (scale). There is a risk of adversely affecting various devices that are For this reason, in order to filter out foreign matter, the flow path is often provided with a filtering device having a strainer, and there is also a check valve with a built-in strainer.

As such a check valve with a strainer, there is a technique disclosed in Patent Document 1 described later. In the check valve disclosed in Patent Document 1, the strainer 3 is integrally fixed to the valve seat 9 provided inside the valve body 1, and the strainer 3 filters the fluid flowing through the internal flow path. The valve body 2 is arranged inside the valve body 1 so as to be able to swing about the axis P, and the valve body 2 contacts the valve seat 9 to close the internal flow path 5. moves away from the valve seat channel 5 and between an open position h that opens the internal channel 5 .

When the fluid is supplied to the internal channel 5, the valve body 2 moves to the open position h to open the internal channel 5. When the valve body 2 returns from the open position h to the closed position t, the valve seat Apply shock or vibration to 9. Due to this impact or vibration, dust and foreign matter adhering to the strainer 3 provided on the valve seat 9 are shaken off and accumulated in the dust receiver 10, thereby preventing clogging of the strainer 3. In addition, the valve body 1 is provided with an inspection viewing window 8 for visually recognizing the accumulation of foreign matter.

Japanese Patent Application Laid-Open No. 2009-228737

However, in the check valve disclosed in Patent Document 1, there is a problem that it is not possible to reliably grasp that the strainer 3 is clogged. That is, in the check valve disclosed in Patent Document 1, when the valve body 2 returns to the closed position t, the valve seat 9 is subjected to impact or vibration to shake off dust and foreign matter adhering to the strainer 3. However, it is difficult to completely remove the foreign matter strongly adhering to the strainer 3, and the strainer 3 becomes clogged with the foreign matter over time.

Such clogging needs to be removed by maintenance work, and it is necessary to properly grasp that clogging has occurred in the strainer 3 in order to perform this maintenance work. The check valve disclosed in Patent Document 1 is provided with an inspection viewing window 8, but a worker must visually check the inside of the check valve through the inspection viewing window 8. Clogging cannot be reliably detected at the appropriate time.

Therefore, the filtering device according to the present application aims to solve these problems, and aims to provide a filtering device that can reliably grasp at an appropriate timing that the filtering means such as a strainer is clogged. and

The filtration device according to the present application is
a valve body through which a fluid passes through a channel formed inside;
Filtering means for permeating and filtering the fluid and capturing foreign matter mixed in the fluid, the filtering means being movable between a reference position and an open position, and positioned at the reference position when in the reference state. Filtration means for permeating and filtering the fluid, and for receiving the fluid pressure of the fluid and being positioned at an open position to allow the passage of the fluid in a clogged state in which permeation of the fluid is inhibited by adhesion of foreign matter. ,
detection means for detecting movement of the filtering means to the open position and outputting a detection signal;
Notification means for receiving the detection signal and notifying that the filtering means is in a clogged state;
characterized by comprising

In the filtering device according to the present application, the detecting means detects the movement of the filtering means to the open position and outputs a detection signal, and the reporting means receives the detection signal and reports that the filtering means is clogged. Therefore, it is possible to reliably grasp that the filtering means is clogged at an appropriate timing.

1 is a cross-sectional view showing a check valve 10 that is a first embodiment of a filtering device according to the present application, and is a cross-sectional view showing a closed state of a valve body 4 in a normal state. FIG. FIG. 3 is a cross-sectional view showing the open state of the valve body 4 of the check valve 10 shown in FIG. 1 during normal operation. 2 is a cross-sectional view showing a 30% open state of the strainer 2 when the check valve 10 shown in FIG. 1 is clogged. FIG. 2 is a graph showing the relationship between the magnetic field detected by the Hall element 8 shown in FIG. 1 and the position (opening degree) of the strainer 2. FIG. 2 is a flowchart of clogging display processing executed by a control unit 41 shown in FIG. 1; FIG. 6 is a graph showing temporal changes in the degree of opening of the strainer 2 for explaining the process shown in FIG. 5; FIG. FIG. 10 is a flow chart of clogging display processing executed by the control unit in the check valve that is the second embodiment of the filtering device according to the present application. FIG. FIG. 8 is a graph showing temporal changes in the degree of opening of the strainer 2 for explaining the process shown in FIG. 7; FIG. FIG. 10 is a flow chart of clogging display processing executed by a control unit in a check valve that is a third embodiment of the filtering device according to the present application. FIG. FIG. 10 is a graph showing temporal changes in the degree of opening of the strainer 2 for explaining the process shown in FIG. 9; FIG. FIG. 10 is a cross-sectional view showing a check valve 60 that is a fourth embodiment of the filtering device according to the present application.

The main terms indicated in the embodiments respectively correspond to the following elements of the filtering device according to the present application.

Strainer 2 Filtering means Valve chamber 5, inlet 10a and outlet 10b Flow path Magnet 6 Magnet, detection target part Hall element 8 Hall element, detection means Check valves 10, 60...・Filtration device Body 12 and body cover 14 Main body Control unit 41 and monitor 42, LED 82 Notification means Normal position P1 Reference position Open position P3 Open position Clogged strainer 2 Condition of … Standard condition Condition of clogged strainer 2 … Clogged condition Degree of opening 30% … Standard level Steam or drain … Fluid

[First embodiment]
A first embodiment of a filtering device according to the present application will be described based on the drawings. In this embodiment, an example in which the filtering device is applied to a check valve is given, and a swing type check valve provided in a piping system arranged in an industrial plant is exemplified as the check valve. This piping system transfers high-temperature, high-pressure steam, and condensate generated from the steam flows in the piping together with the steam.

(Overall Configuration of Check Valve 10)
FIG. 1 is a cross-sectional view showing a check valve 10 according to this embodiment. The check valve 10 in this embodiment has a body 12, and a body lid 14 is fixed to a lid flange 12c positioned above the body 12. As shown in FIG. A valve chamber 5 is formed inside by the body 12 and the body lid 14 .

The body 12 is formed with an inlet 10a and an outlet 10b coaxially positioned, and pipes (not shown) are connected and fixed to inlet flanges 12a and outlet flanges 12b provided respectively, Steam and drain pass through the valve chamber 5 along the forward direction 91 from the inlet 10a to the outlet 10b. The inlet 10a side is the primary side of the check valve 10, and the outlet 10b side is the check valve 10 secondary side.

A strainer 2 is provided in the valve chamber 5 . The strainer 2 has a substantially disk-like shape corresponding to the cylindrical flow path formed by the valve chamber 5, the inlet 10a and the outlet 10b. The strainer 2 in this embodiment is arranged to be rotatable about the shaft 24 in the directions of arrows 95 and 96 .

The strainer 2 has a mesh portion 22 formed over the entire area, and traps foreign matter larger than the mesh of the mesh portion 22 by allowing steam and drain to pass through the mesh portion 22 . The strainer 2 and the shaft 24 are integrally formed. The shaft 24 is supported in a support hole (not shown) formed in the main body 12, and the strainer 2 rotates around the shaft 24. freely held.

A valve seat 16 protruding inward is provided on the bottom surface of the valve chamber 5 . When the strainer tip 2G of the strainer 2 comes into contact with the valve seat 16, the rotation of the strainer 2 in the arrow 96 direction is restricted. As shown in FIG. 1, the strainer tip portion 2G is configured as a projecting portion that protrudes toward the secondary side, and the magnet 6 is incorporated in this projecting portion of the strainer tip portion 2G.

A valve body 4 having a substantially disk-like shape is attached to a shaft 24 of the strainer 2 so as to be rotatable about the shaft 24 as a rotation center. Since the connecting portion (not shown) of the valve body 4 is connected to the shaft 24, the valve body 4 can be independently rotated in the directions of arrows 95 and 96 regardless of the strainer 2 being rotated.

The strainer 2 and the valve body 4 normally hang down due to their own weight, and as indicated by the solid line in FIG. The valve body 4 is sized to cover the mesh portion 22 of the strainer 2. At the normal position P1, the projection of the strainer tip 2G of the strainer 2 is located on the secondary side of the outer peripheral edge of the valve body 4. protruding towards.

A ceiling surface 19 is provided in a protruding state in the upper part of the valve chamber 5, and the strainer 2 and the valve body 4 come into contact with this ceiling surface 19, thereby rotating the strainer 2 and the valve body 4 in the direction of the arrow 95. movement is restricted. A dashed line shown in FIG. 1 is the limit position P2 of the strainer 2 and the valve body 4. In FIG. The entire range rotated in the direction of arrow 95 from the normal position P1 is the open position P3 (including the limit position P2).

A Hall element 8 is fixed to the outer surface portion of the body 12 corresponding to the ceiling surface 19 . The Hall element is an element that detects a magnetic field using the Hall effect, and outputs a detection signal by detecting a change in the magnetic field caused by the magnet 6 built into the strainer tip 2G of the strainer 2. That is, the Hall element as an example of the detection means detects the degree of movement of the strainer 2 as an example of the filtering means to the open position and outputs a detection signal. A detection signal from the hall element 8 is taken into the control section 41, and the control section 41 grasps the position of the magnet 6 in the valve chamber 5 and controls the display on the monitor . A memory 43 is connected to the controller 41 .

(Description of the operation of the check valve 10 under normal conditions)
Next, the operation of the check valve 10 under normal conditions (when the strainer 2 is not clogged) will be described. Steam or drain flows into the valve chamber 5 of the check valve 10 along the forward direction 91 from the inlet 10a through the connected pipe. The steam and drain pass through the mesh portion 22 of the strainer 2 and apply fluid pressure to the valve body 4 .

Receiving this fluid pressure, the valve element 4 is rotated in the direction of the arrow 95 and flipped up to open the valve as shown in FIG. By opening the valve body 4, steam and drain pass through the valve chamber 5 in the forward direction 91 and flow out from the outlet 10b to the pipe on the outlet side.

When steam or drain receives back pressure and flows back into the valve chamber 5 of the check valve 10 along the reverse direction 92, the valve body 4 receives the fluid pressure of the back-flowing steam and drain in addition to its own weight. It rotates in 96 directions and comes into contact with the strainer 2 to close the valve (normal position P1 shown in FIG. 1). By closing the valve body 4, the flow of steam or drain in the reverse direction 92 is blocked, and the function as a check valve is achieved. It should be noted that the strainer 2 is at the closed position P1 both when the flow of steam and drain is in the forward direction 91 and when it is in the reverse direction 92 .

(Description of operation of check valve 10 when clogged)
Next, the operation of the check valve 10 when the strainer 2 is clogged will be described. As described above, the strainer 2 traps foreign matter in steam and drain, and traps the foreign matter by permeating the steam and drain through the mesh portion 22 .

The trapped foreign matter adheres to the mesh portion 22 of the strainer 2 and accumulates gradually. A clogged state is a state in which the mesh portion 22 is clogged with foreign matter and cannot completely pass steam or drain.

When the clogged strainer 2 receives steam or drain flowing in the forward direction 91 , the fluid pressure causes the strainer 2 to rotate about the shaft 24 in the direction of the arrow 95 together with the valve body 4 . Since the strainer 2 rotates to the open position, the flow of steam and drain in the forward direction 91 is not blocked even though the strainer 2 is clogged.

In addition, when the steam or drain receives back pressure and flows back into the valve chamber 5 along the reverse direction 92, the valve body 4 and the strainer 2 receive the fluid pressure of the back-flowing steam and drain in addition to their own weight, It rotates in the direction of arrow 96 to close the valve (Fig. 1) and functions as a check valve.

Here, the opening degree of the strainer 2 (degree of opening of the strainer 2) when the strainer 2 and the valve body 4 are positioned at the normal position P1 shown in FIG. The degree of opening of is assumed to be 100%. When steam or drain flows into the valve chamber 5, the strainer 2 does not always reach the limit position P2 and the degree of opening is 100%. As the range oscillates, the degree of opening often fluctuates.

It should be noted that the strainer 2 and the valve body 4 were not clogged due to the influence of fluctuations in the fluid pressure of the steam and the drain and the vibration applied to the check valve 10, even though the mesh portion 22 of the strainer 2 was not clogged. Although fine opening operations may be repeated, the degree of opening of the strainer 2 in such cases is relatively small.

Therefore, in the present embodiment, as will be described in detail below, the Hall element 8 detects that the opening of the strainer 2 is 30% or more for a certain period of time. It is determined that clogging has occurred, and the occurrence of clogging is displayed on the monitor 42. - 特許庁FIG. 3 shows a state in which the opening degree of the strainer 2 is 30% when clogged.

FIG. 5 shows a flowchart of clogging display processing executed by the control unit 41. As shown in FIG. First, the control unit 41 determines whether or not a detection signal has been received from the Hall element 8 (step S1). Then, when the detection signal is received, the opening degree x of the strainer 2 is obtained from this detection signal (step S2). As described above, the Hall element 8 detects the magnetic field of the magnet 6 built in the strainer tip 2G of the strainer 2 and outputs a detection signal.

FIG. 4 is a graph showing the relationship between the magnetic field detected by the Hall element 8 and the position (opening degree) of the strainer 2. As shown in FIG. As shown in FIG. 4, as the strainer 2 is displaced from the normal position P1 toward the limit position P2 to increase the degree of opening, the magnetic field detected by the Hall element 8 significantly increases from H1 to H2. The relationship between the magnetic field and the degree of opening is stored in the memory 43, and based on this relationship, the controller 41 obtains the degree of opening x of the strainer 2 from the detection signal (magnetic field) in step S2.

Then, it is determined whether or not the opening degree x of the strainer 2 is 30% or more (step S3), and if it is 30% or more, the control section 41 starts a timer (step S4). Thereafter, it is determined again whether or not the detection signal has been received (step S5), the opening degree x of the strainer 2 is obtained from the detection signal (step S7), and whether or not the opening degree x is 30% or more. is determined (step S8). If no detection signal is received in step S5, or if the degree of opening x is less than 30% in step S8, the timer is reset (step S6) and the process returns to step S1.

When the opening degree x is 30% or more in step S8, the control unit 41 determines whether or not the elapsed time t1 by the timer started in step S4 is equal to or more than the reference time ts (step S9). This reference time ts is reference data stored in advance in the memory 43, and is the minimum time during which the opening degree of 30% or more continues when the strainer 2 is clogged.

FIG. 6 is a graph showing temporal changes in the degree of opening of the strainer 2 in this embodiment. In the changes in the degree of opening of the strainer 2 shown in this graph, the elapsed time t1 during which the degree of opening x continues to be 30% or more is less than the reference time ts. When the time comes, the timer is reset (step S6), and the process returns from step S8 to step S1. On the other hand, since the elapsed time t2 in which the degree of opening x continues to be 30% or more is equal to or longer than the reference time ts, the control section 41 determines that the strainer 2 is clogged in step S9.

Then, the control unit 41 displays on the monitor 42 that the strainer 2 of the check valve 10 is clogged (step S10), resets the timer, and ends the process (step S11). The cleaning operation of the strainer 2 is prompted by the control unit 41 displaying the occurrence of clogging on the monitor 42 . Therefore, the occurrence of clogging can be reliably grasped at an appropriate timing, and the operator removes the body lid 14 from the body 12 and removes foreign matter adhering to the mesh portion 22 of the strainer 2, etc., for cleaning work. I do.

As described above, in the present embodiment, it is detected that the opening of the strainer 2 is 30% or more for a certain period of time, and clogging is notified by displaying on the monitor 42 . For this reason, under the influence of fluctuations in the fluid pressure of steam and drain and vibrations applied to the check valve 10, the strainer 2 is not clogged, and the strainer 2 does not open to a degree of 30%. or, even if the degree of opening is 30% or more, the opening operation for a short period of time can be excluded from the notification process. Therefore, it is possible to reliably prevent erroneous notification.

[Second embodiment]
Next, a second embodiment of the filtering device according to the present application will be described. In the above-described first embodiment, clogging is notified by detecting that the strainer 2 has been open at 30% or more for a certain period of time and displaying it on the monitor 42 . However, even if the opening of the strainer 2 is 30% or more for a certain period of time, the strainer may not actually be clogged depending on the degree of opening.

For this reason, as will be described in detail below, in the present embodiment, on the premise that the state in which the opening degree of the strainer 2 is 30% or more has continued for a certain period of time, the elapsed time t and clogging is notified only when the integrated value i is equal to or greater than a predetermined reference integrated value is.

The configuration and operation of the check valve in this embodiment are the same as those of the check valve 10 shown in the above-described first embodiment, so description thereof will be omitted. The check valve according to this embodiment differs from the first embodiment described above in the content of the clogging display process. FIG. 7 shows a flowchart of clogging display processing in this embodiment.

Steps S201 through S209 in the flowchart of FIG. 7 are the same as steps S1 through S9 of the flowchart shown in FIG. In this embodiment, when the elapsed time t1 is equal to or greater than the reference time ts in step S209, the value of the opening degree x is integrated in the range of the elapsed time t on the graph curve of the change in the opening degree x over time to obtain the integrated value i. Calculate (step S210). Then, it is determined whether or not the calculated integrated value i is equal to or greater than the reference integrated value is (step S211).

This reference integral value is reference data stored in memory in advance. It is the minimum value that can be considered as the integrated value obtained by integrating the graph curve over %.

FIG. 8 is a graph showing changes over time in the degree of opening of the strainer in this embodiment. In the changes in strainer opening degree shown in this graph, the elapsed time t21 where the opening degree x continues to be 30% or more is longer than the reference time ts, but the opening degree is 30% or more within the range of this elapsed time t21. The integrated value i21 obtained by integrating the graph curve of x is less than the standard integrated value is. Therefore, the control unit determines that the strainer is not clogged, resets the timer (step S206), and returns from step S211 to step S201.

On the other hand, for the elapsed time t22 where the degree of opening x continues for 30% or more, the integral value is obtained by integrating the graph curve of the degree of opening x that is greater than or equal to the reference time ts and is 30% or more within the range of the elapsed time t22. i22 is greater than or equal to the reference integral value is. Therefore, the control unit determines that the strainer is clogged in step S211, displays clogging on the monitor (step S212), resets the timer, and ends the process. (Step S213).

As described above, in the present embodiment, on the premise that the opening of the strainer 2 is 30% or more for a certain period of time, the opening of the curve on the graph of the opening of 30% or more is within the range of the elapsed time t. The value of x is integrated, and clogging is reported only when the integrated value i is equal to or greater than a predetermined reference integrated value is. Therefore, the case where the integrated value i is less than the reference integrated value is can be excluded from the reporting process, and false reporting can be prevented more reliably.

[Third Embodiment]
Next, a third embodiment of the filtering device according to the present application will be described. In the first embodiment and the second embodiment described above, it is detected that the strainer 2 has been opened at 30% or more for a certain period of time, and based on this, the display on the monitor 42 is performed. clogging was reported by However, even if the opening degree of the strainer 2 does not remain 30% or more for a certain period of time, the strainer may actually be clogged.

For this reason, as will be described in detail below, in this embodiment, when the opening degree of the strainer 2 is 30% or more, a predetermined immediately preceding time bt is traced back from that time point, and the immediately preceding time bt is obtained on the curve on the graph at the opening degree of 30% or more. The value of the degree of opening x is integrated within the range of bt, and clogging is reported only when the sum of the integrated values i is equal to or greater than a predetermined standard integrated value is.

The configuration and operation of the check valve in this embodiment are the same as those of the check valve 10 shown in the above-described first embodiment, so description thereof will be omitted. The check valve according to this embodiment differs from the first embodiment described above in the content of the clogging display process. FIG. 9 shows a flow chart of clogging display processing in this embodiment.

Steps S301 to S303 in the flowchart in FIG. 9 are the same as steps S1 to S3 in the flowchart shown in FIG. 5, so description thereof will be omitted. In this embodiment, when it is determined in step S303 that the opening degree x of the strainer is 30% or more, the graph curve of the change over time of the opening degree x in the state of 30% or more opening degree is integrated within the range of the previous time bt. A total integral value bi is calculated (step S304). The previous time bt is reference data stored in memory in advance.

Thereafter, it is determined whether or not the total integral value bi is greater than or equal to the reference integral value is (step S305). This standard integrated value is is the standard data stored in memory in advance. is the smallest possible value for the total integral value integrated over . If the total integral value bi is less than the reference integral value is in step S305, the process returns to step S301.

FIG. 10 is a graph showing changes over time in the opening degree of the strainer in this embodiment. In this graph, the total integral value bi (the sum of the integral value bi31 and the integral value bi32 ) is greater than or equal to the reference integral value is. Therefore, it is determined that the strainer is clogged, the clogging is displayed on the monitor (step S306), and the process ends.

As described above, in this embodiment, the graph curve of the degree of opening x in the state where the degree of opening x is 30% or more in the range of the previous time bt is integrated, and when the total integral value bi is equal to or greater than the reference integral value is, clogging occurs. show the occurrence of Therefore, even if the state in which the opening of the strainer is 30% or more is discontinuous, for example, it does not continue for the reference time ts shown in the second embodiment, the strainer opens wide and the total integral The occurrence of clogging can be indicated when the value bi is greater than or equal to the reference integrated value is. Thereby, it is possible to reliably grasp that the strainer is clogged at an appropriate timing.

[Fourth embodiment]
Next, a check valve 60, which is a fourth embodiment of the filtering device according to the present application, will be described with reference to FIG. In each of the above-described embodiments, the fact that the strainer 2 is clogged is notified by displaying it on the monitor 42, but in this embodiment, instead of this, the LED 82 is turned on to notify. The basic configuration of the check valve 60 shown in FIG. 11 is the same as the check valve 10 shown in the first embodiment, and the same components as the check valve 10 are denoted by the same reference numerals in FIG. Therefore, description of the configuration and operation is omitted.

As shown in FIG. 11, a support 81 is integrally fixed near the upper opening of the body 12 of the check valve 60, and an LED 82 is provided on the upper surface of the support 81. As shown in FIG. The LED 82 is arranged so as to protrude upward from the body lid 14 when the body lid 14 is attached to the body 12, so that the LED 82 can be easily visually recognized from the outside. The support 81 incorporates a control function and a memory function corresponding to the control unit 41 and the memory 43 shown in FIG.

The clogging display process in this embodiment is also basically the same as the process shown in the first embodiment (FIG. 5), but the display on the monitor 42 in step S10 of FIG. 5 in the first embodiment Instead of the processing, a processing for lighting the LED 82 is executed, and the clogging state is notified through the lighting of the LED 82.例文帳に追加In this embodiment, the LED 82 is turned on, but the LED 82 can also be blinked to further draw attention.

Also, the LED 82 in this embodiment can be applied to the second embodiment or the third embodiment. When applying the LED 82 according to the present embodiment to the second embodiment, the process of lighting the LED 82 is executed instead of the process of step S212 in FIG. When applying the LED 82 according to the present embodiment to the third embodiment, a process of lighting the LED 82 is executed instead of the process of step S306 in FIG.

[Other embodiments]
In each of the above-described embodiments, an example in which the filtering device according to the present application is applied to a swing type check valve was given, but the filtering device according to the present application can also be applied to devices other than check valves. Further, in each of the above-described embodiments, the strainer that rotates around the shaft was exemplified as the filtering means, but other configurations can be adopted as long as they can move between the reference position and the open position. can. For example, a strainer that is biased by a spring and moves linearly in parallel under the fluid pressure of the fluid may be employed as the filtering means.

Further, in each of the above-described embodiments, the Hall element was exemplified as the detection means, and the magnet was exemplified as the part to be detected. shape and structure may be adopted. For example, a Hall IC may be used instead of the Hall element.

Furthermore, in each of the above-described embodiments, clogging is judged based on the degree of opening of the strainer of 30%. Further, it is also possible to detect clogging by detecting the moving distance of the strainer instead of the degree of opening of the strainer, and using the predetermined male reference distance as a reference degree.

In each of the above-described embodiments, a monitor or an LED was used as the notification means, but the present invention is not limited to this, and an audio notification is possible as long as it is possible to notify that the filtering means is clogged. etc., other configurations may be employed.

2: Strainer 5: Valve chamber 6: Magnet 8: Hall element 10, 60: Check valve
10a: Inlet 10b: Outlet 12: Body 14: Body lid 41: Control unit
42: Monitor 82: LED P1: Normal position P3: Open position

Claims (4)

a body through which a fluid passes through channels formed therein;
Filtering means for permeating and filtering the fluid and capturing foreign matter mixed in the fluid, the filtering means being movable between a reference position and an open position, and positioned at the reference position when in the reference state. Filtration means for permeating and filtering the fluid, and for receiving the fluid pressure of the fluid and being positioned at an open position to allow the passage of the fluid in a clogged state in which permeation of the fluid is inhibited by adhesion of foreign matter. ,
detection means for detecting movement of the filtering means to the open position and outputting a detection signal;
Notification means for receiving the detection signal and notifying that the filtering means is in a clogged state;
A filtering device comprising: In the filtering device according to claim 1,
The detection means detects the movement of the filtering means to the open position by detecting a distance from a specific detection target portion of the filtering means.
A filtering device characterized by: In the filtering device according to claim 1 or claim 2,
the detection means detects the degree of movement of the filtering means to the open position and outputs a detection signal representing the degree of movement;
The notification means notifies that the filtering means is clogged based on the degree of movement of the filtering means to the open position exceeding a predetermined reference degree.
A filtering device characterized by: In the filtering device according to claim 2 or claim 3,
The detection target part is a magnet provided in the filtering means,
The detection means is a Hall element,
A filtering device characterized by:

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