filtration device

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

[Technical Field]

[0001] The filtering device according to the present application relates to a technique for a filtering device having a filtering means such as a strainer that captures foreign matter in a fluid. [Background technology]

[0002] An example of equipment equipped with a filtration device is a check valve. A check valve is a valve installed in a fluid flow path and equipped with a mechanism to prevent backflow due to back pressure of the fluid. For example, piping installed in an industrial plant transports high-temperature, high-pressure steam, and within this piping, drainage (condensed water) generated from the steam flows in a specified direction (forward) along with the steam.

[0003] To prevent this backflow of steam and condensate, check valves are installed at necessary locations on the piping. There are various types of check valves, including swing check valves, lift check valves, and spring disc check valves.

[0004] However, steam and drain often contain foreign matter such as rust and scale, and if steam or drain is transported with an excessive amount of foreign matter, it may have a negative effect on various devices installed in the flow path.For this reason, filtering devices with strainers are often installed in the flow path to filter out foreign matter, and there are also check valves with built-in strainers.

[0005] One example of such a check valve with a strainer is the technology disclosed in Patent Document 1, which will be described later. In the check valve disclosed in Patent Document 1, a strainer 3 is fixed integrally to a valve seat 9 provided inside a valve body 1, and the strainer 3 filters the fluid flowing through the internal flow path. A valve disc 2 is disposed inside the valve body 1 so as to be swingable about an axis P, and the valve disc 2 moves between a closed position t where it abuts against the valve seat 9 and closes the internal flow path 5, and an open position h where it moves away from the valve seat flow path 5 and opens the internal flow path 5.

[0006] When fluid is supplied to the internal flow path 5, the valve disc 2 moves to the open position h to open the internal flow path 5, but when the valve disc 2 returns from this open position h to the closed position t, it applies an impact or vibration to the valve seat 9. This impact or vibration shakes off any dirt or foreign matter adhering to the strainer 3 attached to the valve seat 9 and collects in the dirt receiver 10, preventing clogging of the strainer 3. The valve body 1 is also provided with an inspection sight window 8 for visually checking the level of foreign matter accumulated. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-228737 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the check valve disclosed in Patent Document 1 has the problem of being unable to reliably detect clogging of the strainer 3. That is, when the valve disc 2 returns to the closed position t, the check valve disclosed in Patent Document 1 applies impact or vibration to the valve seat 9 to shake off dirt and foreign matter adhering to the strainer 3, but it is difficult to completely remove foreign matter that is firmly attached to the strainer 3, and over time the strainer 3 becomes clogged with foreign matter.

[0009] Such clogging must be removed by maintenance work, and in order to perform this maintenance work, it is necessary to properly recognize that clogging has occurred in the strainer 3. The check valve disclosed in Patent Document 1 is provided with an inspection sight glass 8, but an operator must visually check the inside of the check valve through the inspection sight glass 8, which makes it difficult to reliably recognize clogging in a timely manner.

[0010] Therefore, the filtration device of the present application aims to solve these problems and provide a filtration device that can reliably detect clogging of a filtration means such as a strainer at an appropriate time. [Means for solving the problem]

[0011] The filtration device according to the present application comprises: a valve body through which a fluid passes through a flow path formed therein; a filtering means for filtering the fluid by allowing it to pass through and trapping foreign matter mixed in the fluid, the filtering means being movable between a reference position and an open position, and in a reference state, being positioned at the reference position to filter the fluid by passing through, and in a clogged state in which the passage of the fluid is hindered by the adhesion of foreign matter, being positioned at the open position by receiving the fluid pressure of the fluid, allowing the fluid to pass through; a detection means for detecting movement of the filtering means to the open position and outputting a detection signal; an alarm means for receiving the detection signal and notifying that the filtering means is clogged; The present invention is characterized by the following. [Effects of the Invention]

[0012] 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 notifying means receives the detection signal and notifies that the filtering means is clogged, so that it is possible to reliably know at an appropriate time that the filtering means is clogged. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing a check valve 10 that is a first embodiment of a filtration device according to the present application, showing a valve element 4 in a normally closed state. [Figure 2] 2 is a cross-sectional view showing a valve element 4 of the check valve 10 shown in FIG. 1 in a normally open state. [Figure 3] 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. [Figure 4] 2 is a graph showing the relationship between the magnetic field detected by the Hall element 8 shown in FIG. 1 and the position (degree of opening) of the strainer 2. [Figure 5] 2 is a flowchart of a clogging display process executed by a control unit 41 shown in FIG. 1. [Figure 6] 6 is a graph showing the change over time in the degree of opening of the strainer 2 for explaining the process shown in FIG. 5. [Figure 7] 10 is a flowchart of a clogging indication process executed by a control unit in a check valve that is a second embodiment of a filtering device according to the present application. [Figure 8] 8 is a graph showing the change over time in the degree of opening of the strainer 2 for explaining the process shown in FIG. 7. [Figure 9] 10 is a flowchart of a clogging display process executed by a control unit in a check valve that is a third embodiment of a filtering device according to the present application. [Figure 10] 10 is a graph showing the change over time in the degree of opening of the strainer 2 for explaining the process shown in FIG. 9. [Figure 11] 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. DETAILED DESCRIPTION OF THE INVENTION

[0014] The main terms used in the embodiments correspond to the following elements of the filtration device according to the present application.

[0015] Strainer 2: Filtering means Valve chamber 5, inlet 10a and outlet 10b...flow path Magnet 6: Magnet, detection target area Hall element 8: Hall element, detection means Check valve 10, 60... Filtration device Body 12 and body cover 14...Main body Control unit 41, monitor 42, LED 82...notification means Normal position P1...Reference position Open position P3...Open position Strainer 2 without clogging: Standard condition Condition of strainer 2 where clogging has occurred...Clogging condition Opening degree 30%...standard level Steam or drainage fluid

[0016] [First embodiment] A first embodiment of a filtration device according to the present application will be described with reference to the drawings. In this embodiment, an example is given in which the filtration device is applied to a check valve, and a swing-type check valve installed in a piping system arranged in an industrial plant is exemplified as the check valve. This piping system transports high-temperature, high-pressure steam, and drainage generated from the steam flows within the piping along with the steam.

[0017] (Overall configuration of check valve 10) 1 is a cross-sectional view showing a check valve 10 according to this embodiment. The check valve 10 according to this embodiment includes a body 12, and a body lid 14 is fixed to a lid flange 12c located on the upper part of the body 12. The body 12 and the body lid 14 form a valve chamber 5 therein.

[0018] The body 12 is formed with an inlet 10a and an outlet 10b that are positioned coaxially, and piping (not shown) is connected and fixed to the inlet flange 12a and outlet flange 12b provided on each, so that steam and condensate pass through the valve chamber 5 in a 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 secondary side of the check valve 10.

[0019] A strainer 2 is provided in the valve chest 5. The strainer 2 has a substantially disk-like shape corresponding to the cylindrical flow path formed by the valve chest 5, the inlet 10a, and the outlet 10b. In this embodiment, the strainer 2 is disposed so as to be rotatable in the directions of arrows 95 and 96 around an axis 24.

[0020] Strainer 2 has a mesh portion 22 formed over the entire surface, and by allowing steam and drainage to pass through this mesh portion 22, foreign matter larger than the mesh of mesh portion 22 is captured. Strainer 2 and shaft 24 are integrally formed, and shaft 24 is supported in a support hole (not shown) formed in main body 12, so that strainer 2 is held rotatable around shaft 24 as the center of rotation.

[0021] A valve seat 16 that protrudes inward is provided on the bottom surface of the valve chest 5. The strainer tip 2G of the strainer 2 abuts against this valve seat 16, thereby restricting rotation of the strainer 2 in the direction of arrow 96. The strainer tip 2G is configured as a protrusion that protrudes toward the secondary side as shown in FIG. 1, and a magnet 6 is built into this protrusion of the strainer tip 2G.

[0022] Furthermore, a valve element 4 having a generally disk-like shape is attached to the shaft 24 of the strainer 2 so as to be rotatable about the shaft 24. Because a connecting portion (not shown) of the valve element 4 is connected to the shaft 24, the valve element 4 can rotate in the directions of arrows 95 and 96 independently of the rotation of the strainer 2.

[0023] The strainer 2 and valve element 4 normally hang down due to their own weight, and are positioned in a normal position P1 with the strainer 2 and valve element 4 overlapping each other, as shown by the solid line in Figure 1. The valve element 4 is formed to a size that covers the mesh portion 22 of the strainer 2, and in the normal position P1, the protruding portion of the strainer tip 2G of the strainer 2 protrudes further toward the secondary side than the outer circumferential edge of the valve element 4.

[0024] A protruding ceiling surface 19 is provided above the valve chamber 5, and the strainer 2 and valve disc 4 come into contact with this ceiling surface 19, restricting their rotation in the direction of arrow 95. The dashed line in Figure 1 indicates the limit position P2 of the strainer 2 and valve disc 4. The entire range of rotation from the normal position P1 in the direction of arrow 95 is the open position P3 (including the limit position P2).

[0025] A Hall element 8 is fixed to the outer surface 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 changes in the magnetic field caused by the magnet 6 built into the strainer tip 2G of the strainer 2. In other words, the Hall element, which is an example of a detection means, detects the degree to which the strainer 2, which is an example of a filtering means, has moved to the open position and outputs a detection signal. The detection signal from the Hall element 8 is input to a control unit 41, which determines the position of the magnet 6 in the valve chest 5 and controls the display on a monitor 42. A memory 43 is connected to the control unit 41.

[0026] (Explanation of the operation of the check valve 10 under normal conditions) Next, we will explain the operation of the check valve 10 under normal conditions (when the strainer 2 is not clogged). Steam and condensate flow into the valve chamber 5 of the check valve 10 from the inlet 10a through the connected piping in the forward direction 91. The steam and condensate then pass through the mesh portion 22 of the strainer 2 and apply fluid pressure to the valve element 4.

[0027] This fluid pressure causes the valve element 4 to rotate in the direction of arrow 95 and jump up, opening the valve as shown in Figure 2. When the valve element 4 opens, steam and condensate pass through the valve chamber 5 in the forward direction 91 and flow out of the outlet 10b into the piping on the outlet side.

[0028] When steam or condensate is subjected to back pressure and flows back into the valve chamber 5 of the check valve 10 in the reverse direction 92, the valve disc 4 rotates in the direction of arrow 96 due to its own weight as well as the fluid pressure of the backflowing steam or condensate, and comes into contact with the strainer 2, closing the valve (normal position P1 shown in Figure 1). The closing of the valve disc 4 prevents the flow of steam or condensate in the reverse direction 92, thereby fulfilling its function as a check valve. The strainer 2 is in the closed position P1 whether the steam or condensate flows in the forward direction 91 or the reverse direction 92.

[0029] (Explanation of the operation of the check valve 10 when it is clogged) Next, we will explain the operation of the check valve 10 when the strainer 2 is clogged. As mentioned above, the strainer 2 captures foreign matter in steam and drainage, and captures the foreign matter by allowing the steam and drainage to pass through the mesh portion 22.

[0030] The trapped foreign matter adheres to and gradually accumulates on the mesh portion 22 of the strainer 2. When the mesh portion 22 is blocked by the foreign matter and steam and drain cannot pass through completely, the mesh portion 22 becomes clogged.

[0031] When strainer 2 in this clogged state is subjected to a flow of steam or condensate in forward direction 91, the fluid pressure causes strainer 2 to rotate in the direction of arrow 95 around axis 24 together with valve body 4. By rotating strainer 2 to the open position, the flow of steam or condensate in forward direction 91 is not impeded, even though strainer 2 is clogged.

[0032] If steam or condensate is subjected to back pressure and flows back into the valve chest 5 in the reverse direction 92, the valve element 4 and strainer 2 will be subjected to their own weights as well as the fluid pressure of the backflowing steam or condensate, causing them to rotate in the direction of arrow 96 and close (Figure 1), functioning as a check valve.

[0033] Here, the degree of opening of the strainer 2 (the degree of opening of the strainer 2) when the strainer 2 and valve element 4 are located at the normal position P1 shown in Figure 1 is set to 0%, and the degree of opening of the strainer 2 when they reach the limit position P2 is set to 100%. When steam or condensate flows into the valve chest 5, the strainer 2 does not always reach the limit position P2 and reach a degree of opening of 100%, but in reality, it often oscillates within the range of an opening position P3 between the normal position P1 and the limit position P2, and the degree of opening also fluctuates.

[0034] In addition, due to fluctuations in the fluid pressure of the steam or drain or vibrations applied to the check valve 10, the strainer 2 and the valve body 4 may repeat small opening movements even though the mesh portion 22 of the strainer 2 is not clogged, but in such cases the degree of opening of the strainer 2 is relatively small.

[0035] Therefore, in this embodiment, as will be described in detail below, the Hall element 8 detects that the strainer 2 has been open by 30% or more for a certain period of time, and the control unit 41 determines that the strainer 2 is clogged and displays the occurrence of clogging on the monitor 42. Figure 3 shows the strainer 2 when it is clogged and the opening is 30%.

[0036] 5 shows a flowchart of the clogging display process executed by the control unit 41. First, the control unit 41 determines whether or not a detection signal has been received from the Hall element 8 (step S1). If a detection signal has been received, the control unit 41 obtains the opening degree x of the strainer 2 from the detection signal (step S2). As described above, the Hall element 8 detects the magnetic field of the magnet 6 built into the strainer tip 2G of the strainer 2 and outputs a detection signal.

[0037] 4 is a graph showing the relationship between the magnetic field detected by the Hall element 8 and the position (degree of opening) of the strainer 2. As shown in FIG. 4, as the strainer 2 moves from normal position P1 toward limit position P2 and the degree of opening increases, the magnetic field detected by the Hall element 8 increases significantly from H1 to H2. This relationship between the magnetic field and the degree of opening is stored in memory 43, and in step S2, the control unit 41 determines the degree of opening x of the strainer 2 from the detection signal (magnetic field) based on this relationship.

[0038] Then, it is determined whether the degree of opening x of the strainer 2 is 30% or more (step S3), and if it is 30% or more, the control unit 41 starts the timer (step S4). Thereafter, it is determined again whether a detection signal has been received (step S5), the degree of opening x of the strainer 2 is calculated from the detection signal (step S7), and it is determined whether the degree of opening x is 30% or more (step S8). If a detection signal has not been 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.

[0039] If the degree of opening x is 30% or more in step S8, the control unit 41 determines whether the elapsed time t1 measured by the timer started in step S4 is equal to or greater 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 degree of opening of 30% or more is considered to continue when clogging occurs in the strainer 2.

[0040] 6 is a graph showing the change over time in the degree of opening of the strainer 2 in this embodiment. In the change 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, so the control unit 41 resets the timer when the degree of opening x becomes less than 30% (step S6) and returns to the processing of step S1 from step S8. In contrast, the elapsed time t2 during which the degree of opening x continues to be 30% or more is greater than the reference time ts, so the control unit 41 determines in step S9 that clogging has occurred in the strainer 2.

[0041] Then, the control unit 41 displays on the monitor 42 a message indicating that clogging has occurred in the strainer 2 of the check valve 10 (step S10), resets the timer, and ends the process (step S11). The control unit 41 displays on the monitor 42 that clogging has occurred, prompting the operator to perform cleaning work on the strainer 2. This allows the operator to reliably recognize that clogging has occurred at an appropriate time, and the operator then removes the body lid 14 from the body 12 and performs cleaning work to remove foreign matter adhering to the mesh portion 22 of the strainer 2, etc.

[0042] As described above, in this embodiment, when the strainer 2 has been open by 30% or more for a certain period of time, the system detects the condition and displays the information on the monitor 42 to warn of clogging. Therefore, when the strainer 2 opens slightly below 30% even when it is not clogged due to fluctuations in the fluid pressure of the steam or drain or vibrations applied to the check valve 10, or when it opens for a short period of time even when it is open by 30% or more, the system can exclude these cases from the scope of the warning process. This makes it possible to reliably prevent false warnings.

[0043] [Second embodiment] Next, a second embodiment of the filtration device according to the present invention will be described. In the first embodiment described above, the system detects that the strainer 2 has been opened 30% or more for a certain period of time, and notifies the user of clogging by displaying a message on the monitor 42. However, even if the strainer 2 has been opened 30% or more for a certain period of time, depending on the degree of opening, the strainer may not actually be clogged.

[0044] For this reason, as will be described in detail below, in this embodiment, assuming that the strainer 2 has remained at an opening rate of 30% or more for a certain period of time, the value of the opening rate x is integrated over the range of elapsed time t on the curve on the graph where the opening rate is 30% or more, and clogging is reported only if the integrated value i is equal to or greater than a predetermined reference integral value is.

[0045] The configuration and operation of the check valve in this embodiment are similar to those of the check valve 10 shown in the first embodiment described above, and therefore a description thereof will be omitted. The check valve in this embodiment differs from the first embodiment in the content of the clogging display process. Figure 7 shows a flowchart of the clogging display process in this embodiment.

[0046] Steps S201 to S209 in the flowchart of Fig. 7 are similar to steps S1 to S9 in the flowchart shown in Fig. 5, and therefore a description thereof will be omitted. In this embodiment, if the elapsed time t1 is equal to or greater than the reference time ts in step S209, the value of the degree of opening x is integrated within the range of the elapsed time t in the graph curve of the change in the degree of opening x over time to calculate an integral value i (step S210). Then, it is determined whether the calculated integral value i is equal to or greater than the reference integral value is (step S211).

[0047] This reference integral value is is reference data stored in advance in memory, and is the smallest possible integral value obtained by integrating the graph curve for an opening of 30% or more over the elapsed time t1 when the strainer becomes clogged and the state where the opening is 30% or more continues for more than the reference time ts.

[0048] 8 is a graph showing the change over time in the strainer opening in this embodiment. In the change in the strainer opening shown in this graph, the elapsed time t21 during which the opening x continues to be 30% or more is equal to or longer than the reference time ts, but the integral value i21 obtained by integrating the graph curve for the opening x of 30% or more within this range of elapsed time t21 is less than the reference integral value is. Therefore, the control unit determines that the strainer is not clogged, resets the timer (step S206), and returns to the process of step S201 from step S211.

[0049] In contrast, the elapsed time t22 during which the opening degree x continues to be 30% or more is equal to or greater than the reference time ts, and the integral value i22 obtained by integrating the graph curve for the opening degree x of 30% or more within the range of the elapsed time t22 is equal to or greater than the reference integral value is. Therefore, the control unit determines in step S211 that the strainer is clogged, displays a message indicating that clogging has occurred on the monitor (step S212), resets the timer, and ends the process (step S213).

[0050] As described above, in this embodiment, assuming that the strainer 2 has remained at or above 30% opening for a certain period of time, the value of the opening x is integrated over the range of elapsed time t on the curve on the graph where the opening is above 30%, and a clogging alarm is issued only when the integrated value i is equal to or greater than a predetermined reference integral value is. Therefore, cases where the integral value i is less than the reference integral value is can be excluded from the alarm processing, making it possible to more reliably prevent false alarms.

[0051] [Third embodiment] Next, a third embodiment of the filtration device according to the present application will be described. In the first and second embodiments described above, it is detected that the strainer 2 has been opened by 30% or more for a certain period of time, and based on this, a clogging alert is displayed on the monitor 42. However, even if the strainer 2 does not remain opened by 30% or more for a certain period of time, a clogging may actually occur in the strainer.

[0052] For this reason, as will be described in detail below, in this embodiment, when the opening degree of the strainer 2 becomes 30% or more, the value of the opening degree x is integrated within the range of the previous time bt from that point on the curve on the graph where the opening degree is 30% or more, and clogging is only notified if the sum of the integrated values ​​i is equal to or greater than a predetermined reference integral value is.

[0053] The configuration and operation of the check valve in this embodiment are similar to those of the check valve 10 shown in the first embodiment described above, and therefore a description thereof will be omitted. The check valve in this embodiment differs from the first embodiment in the content of the clogging display process. Figure 9 shows a flowchart of the clogging display process in this embodiment.

[0054] Steps S301 to S303 in the flowchart of Fig. 9 are similar to steps S1 to S3 in the flowchart shown in Fig. 5, and therefore a description thereof will be omitted. In this embodiment, if it is determined in step S303 that the strainer opening degree x is 30% or more, a total integral value b i is calculated by integrating the graph curve of the change over time in the opening degree x when the opening degree is 30% or more within the range of the previous time bt (step S304). The previous time bt is reference data stored in advance in memory.

[0055] Then, it is determined whether the total integral value bi is equal to or greater than the reference integral value is (step S305). This reference integral value is is reference data stored in memory in advance, and is the smallest possible total integral value obtained by integrating the graph curve of the change over time in the degree of opening x when the degree of opening is 30% or more within the range of the immediately preceding time bt when clogging occurs in the strainer. If the total integral value bi is less than the reference integral value is in step S305, the process returns to step S301.

[0056] 10 is a graph showing the change over time in the strainer opening in this embodiment. In this graph, the total integral value bi (the sum of integral value bi31 and integral value bi32) obtained by integrating the graph curve of the change over time in the strainer opening x when the opening x is 30% or more over the range of the previous time bt is equal to or greater than the reference integral value is. Therefore, it is determined that the strainer is clogged, and the occurrence of clogging is displayed on the monitor (step S306), and the process ends.

[0057] As described above, in this embodiment, the graph curve of the strainer opening x when the opening x is 30% or more within the range of the immediately preceding time bt is integrated, and the occurrence of clogging is indicated when the total integral value b i is equal to or greater than the reference integral value is. Therefore, even if the strainer opening state of 30% or more is discontinuous, for example, does not continue for more than the reference time ts shown in the second embodiment, the occurrence of clogging can be indicated when the strainer is fully open and the total integral value b i is equal to or greater than the reference integral value is. This makes it possible to reliably detect the occurrence of clogging in the strainer at the appropriate time.

[0058] [Fourth embodiment] Next, a check valve 60, which is a fourth embodiment of the filtration device according to the present application, will be described with reference to Figure 11. In the above-described embodiments, the occurrence of clogging in the strainer 2 was notified by displaying a message on the monitor 42, but in this embodiment, the notification is made by lighting an LED 82 instead. The basic configuration of the check valve 60 shown in Figure 11 is the same as that of the check valve 10 shown in the first embodiment, and the same components as those of the check valve 10 are assigned the same reference numerals in Figure 11, and descriptions of their configurations and operations will be omitted.

[0059] 11, a support body 81 is fixed integrally to the body 12 of the check valve 60 near the upper opening, and an LED 82 is provided on the upper surface of this support body 81. The LED 82 is arranged so as to protrude upward from the body lid 14 when the body 12 is attached to the body 12, making it easy to see the LED 82 from the outside. The support body 81 has built-in control and memory functions corresponding to the control unit 41 and memory 43 shown in FIG.

[0060] The clogging indication process in this embodiment is basically the same as the process shown in the first embodiment (FIG. 5), but instead of the display process on the monitor 42 in step S10 in FIG. 5 in the first embodiment, a process of lighting up the LED 82 is executed to notify the user of a clogging state by lighting up the LED 82. In this embodiment, the LED 82 is lit up, but it is also possible to further draw attention by making the LED 82 flash.

[0061] The LED 82 of this embodiment can also be applied to the second or third embodiment. When the LED 82 of this embodiment is applied to the second embodiment, a process of turning on the LED 82 is executed instead of the process of step S212 in Fig. 7, and the fact that the jam is present is notified by the lighting of the LED 82. When the LED 82 of this embodiment is applied to the third embodiment, a process of turning on the LED 82 is executed instead of the process of step S306 in Fig. 9, and the fact that the jam is present is notified by the lighting of the LED 82.

[0062] [Other embodiments] In the above-described embodiments, an example was given in which the filtration device according to the present application was applied to a swing-type check valve, but the filtration device according to the present application can also be applied to equipment other than check valves. Furthermore, in the above-described embodiments, a strainer that rotates around an axis was used as the filtration means, but other configurations can be used as long as they are movable between a reference position and an open position. For example, a strainer that is biased by a spring and moves linearly in parallel under the fluid pressure can also be used as the filtration means.

[0063] In addition, in the above-described embodiments, a Hall element is used as the detecting means and a magnet is used as the detection target, but other shapes and structures may be used as long as they are capable of detecting the degree of movement of the filtering means to the open position. For example, a Hall IC may be used instead of the Hall element.

[0064] Furthermore, in the above-described embodiments, clogging is judged based on a strainer opening of 30% as a reference level, but a value greater or less than 30% may be used as the reference level. Also, instead of the strainer opening level, the movement distance of the strainer may be detected, and clogging may be judged based on a predetermined reference distance.

[0065] Furthermore, in each of the above-described embodiments, a monitor or LED is used as the notification means, but this is not limited to this, and other configurations such as audio notification may be adopted as long as it is possible to notify that the filtering means is clogged. [Explanation of symbols]

[0066] 2: Strainer 5: Valve chamber 6: Magnet 8: Hall element 10, 60: Check valve 10a: inlet 10b: outlet 12: body 14: body cover 41: control section 42: Monitor 82: LED P1: Normal position P3: Open position

Claims

[Claim 1] a body through which a fluid passes through a flow path formed therein; a filtering means for filtering the fluid by allowing it to pass through and trapping foreign matter mixed in the fluid, the filtering means being movable between a reference position and an open position by rotating about an axis, the filtering means being located at the reference position when in a reference state and filtering the fluid in a forward direction, and being located at the open position when in a clogged state where the fluid is prevented from passing through in the forward direction due to adhesion of foreign matter, and receiving the fluid pressure from the fluid, and allowing the fluid to pass through in the forward direction; a valve element that is movable between a valve open position and a valve closed position by rotating about the axis, and when the fluid flows in the forward direction, moves to the valve open position to allow the fluid to flow in the forward direction, and when the fluid flows in a direction opposite to the forward direction, moves to the valve closed position to prevent the fluid from flowing in the reverse direction; a Hall element that detects the distance from a magnet provided in the filtering means to detect movement of the filtering means to an open position and outputs a detection signal; an alarm means for receiving the detection signal and notifying that the filtering means is clogged; A filtration device comprising:

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