JP7595053B2 - Structure with coated member, filter, and abnormality detection method - Google Patents

Description

The present invention relates to a structure with a coated member, a filter equipped with a structure with a coated member, and a method for detecting an abnormality in a structure with a coated member.

Conventionally, in various devices, covering members are used to protect movable members. A bellows, as one example of a covering member, is a cylindrical, bellows-like expandable member that deforms in response to the deformation of the movable member. Such covering members perform their function by blocking the intrusion of fluids from the outside into the space between the covering member and the movable member.

A known example of a device equipped with a bellows, which is an example of a covering member, is a centrifuge as described in Patent Document 1 below. This centrifuge is equipped with a rotating shaft having rotors that scrape off the separated cake, and a bellows that covers the rotating shaft. The centrifuge in Patent Document 1 is also configured so that the rotating shaft moves in the axial direction so that the height of the rotors can be adjusted. At this time, the bellows expands and contracts as the rotating shaft moves in the axial direction.

Such bellows may be damaged by repeated expansion and contraction. Therefore, the centrifuge in Patent Document 1 is equipped with a damage detection means connected to the space between the rotating shaft and the bellows. This damage detection means has a pressure gauge connected to the space, and detects damage to the bellows based on the fact that the pressure fluctuation range in the space caused by the expansion and contraction of the bellows under normal conditions decreases when the bellows is damaged.

JP 2000-301028 A

However, there is a device in which a covering member is provided inside a container that can reduce or pressurize the inside of the container. For example, a filter dryer includes a container that can reduce or pressurize the inside of the container, a shaft member (movable member) with rotors, and a bellows (covering member) that covers the shaft member. In such a filter dryer, there is a risk of the bellows being damaged, so it is preferable that the device is configured to detect damage to the bellows.

In view of the above circumstances, the present invention aims to provide a structure with a coated member that can more accurately and easily detect damage to a coated member placed inside a container whose interior is under reduced pressure or pressure, a filter equipped with the structure with a coated member, and an abnormality detection method.

A structure with a coated member according to one aspect of the present invention includes:
A container capable of reducing or increasing the pressure inside the container;
A movable member disposed inside the container;
A covering member that covers at least a portion of the movable member;
A fluid detection device,
A space is formed between the movable member and the covering member,
The fluid detection device is configured to detect damage to the covering member based on the flow of fluid or pressure fluctuations in the space caused by a reduced pressure or pressurized state inside the container that occurs when the interior of the container and the space become connected due to damage to the covering member.

This configuration makes it possible to detect damage to the covering member both when the covering member is expanding or contracting, and when it is not expanding or contracting, and allows damage to the covering member to be detected more quickly.

In addition, a structure with a coated member according to one aspect of the present invention includes:
The fluid detection device is configured to detect damage to the covering member based on a fluid flow or pressure fluctuation in the space when the covering member is not expanding or contracting.

With the above configuration, there is no change in fluid flow or pressure due to the expansion and contraction of the covering member, so even if a slight movement of fluid occurs within the space due to damage to the covering member, it can be accurately detected.

In addition, a structure with a coated member according to one aspect of the present invention includes:
The fluid detection device is equipped with a measuring instrument that measures the flow rate of the fluid or the pressure within the space, and is configured to detect damage to the covering member based on a preset flow rate or pressure threshold and the measured value of the flow rate or pressure.

When the covering member is damaged, the pressure inside the container is transmitted to the space, causing the fluid in the space to flow or the pressure to fluctuate. Therefore, with the above configuration, damage to the covering member can be detected by measuring the flow rate or pressure of the fluid.

In addition, a structure with a coated member according to one aspect of the present invention includes:
The fluid sensing device is disposed outside the container;
A flow path is provided for allowing fluid to communicate between the space and the fluid detection device.

By disposing the fluid detection device outside the container, the fluid detection device is not exposed to the workpiece contained inside the container or the pressure and temperature inside the container, so measurement accuracy is less likely to decrease and damage to the coating member can be detected more accurately. In addition, the fluid detection device can be easily replaced.

A filter according to one aspect of the present invention includes any one of the above-described structures with a coated member,
The container has a filtration section,
The movable member has a rotating shaft and a rotor connected to the rotating shaft,
The covering member is configured to cover at least a portion of the rotating shaft.

This configuration makes it possible to more accurately and easily detect damage to the covering member placed inside the filter.

A method for detecting an abnormality in a structure with a coated member according to one aspect of the present invention includes the steps of:
The structure with a coated member is
A container capable of reducing or increasing the pressure inside the container;
A movable member disposed within the container;
a covering member that covers at least a portion of the movable member,
A space is formed between the movable member and the covering member,
Damage to the covering member is detected based on the flow of fluid or pressure fluctuations in the space caused by a reduced pressure or pressurized state inside the container, which occurs when the inside of the container and the space become connected due to damage to the covering member.

This configuration allows damage to the covering member to be detected more accurately and easily.

In addition, in a method for detecting an abnormality in a structure with a coated member according to one aspect of the present invention,
Before using the structure with a coated member, the inside of the container is placed in a reduced pressure or pressurized state, and the state of the coated member is judged based on the flow of fluid or pressure fluctuation in the space caused by the reduced pressure or pressurized state.

This configuration allows the structure with the covering member to be used safely.

As described above, the present invention can provide a structure with a coated member that can more accurately and easily detect damage to a coated member placed inside a container in which the inside of the container is depressurized or pressurized, a filter including the structure with a coated member, and a method for detecting an abnormality in a structure with a coated member.

FIG. 2 is a schematic side view of a filter dryer including a covering member-attached structure according to one embodiment, showing the internal structure of the container. 2 is an enlarged view showing a space between a first bellows (inner bellows) disposed inside a container and a rotating shaft in the filter dryer of FIG. 1 . FIG. 2 is an enlarged view showing a space between a second bellows (external bellows) disposed outside a container and a rotating shaft in the filter dryer of FIG. 1 . FIG. 2 is an enlarged view of a fluid detection device provided for detecting an abnormality in a first bellows (internal bellows) in the filter dryer of FIG. 1 . FIG. 2 is an enlarged view of a fluid detection device provided for detecting an abnormality in the third bellows in the filter dryer of FIG. 1 . FIG.

Below, we will explain a structure with a coated member according to one embodiment of the present invention, using a filter dryer as an example, with reference to the attached drawings.

As shown in FIG. 1, the filter dryer 1 according to this embodiment includes a container 10 for containing the material to be treated, a stirring device 20 for stirring the material to be treated contained in the container 10, and an opening/closing device 30 for opening and closing an outlet for the dried material obtained by drying the material to be treated.

The container 10 of this embodiment has a cylindrical side wall portion 11 extending in the vertical direction, a ceiling portion 12 that closes the upper end of the side wall portion 11, and a lower lid portion 13 that closes the lower end of the side wall portion 11. The container 10 has a container interior V1 surrounded by the side wall portion 11, the ceiling portion 12, and the lower lid portion 13. The material to be treated contained in the container interior V1 can be, for example, a slurry liquid containing a liquid such as a solvent and a solid suspended in the liquid.

The vessel 10 has an inlet 14 for introducing a fluid such as the slurry liquid into the vessel interior V1. The inlet 14 includes an inlet pipe 141 connected to an inlet opening formed in the ceiling 12, and a first valve 142 that allows the flow path of the inlet pipe 141 to be switched between open and closed.

The lower lid 13 has a filter section for filtering the slurry liquid introduced into the container interior V1. Specifically, the lower lid 13 has a lid body 131 that closes the lower end of the side wall 11, and a filter plate 132 that is provided above the lid body 131 and allows liquid matter to pass through while collecting solid matter contained in the slurry liquid.

The container 10 has a discharge section 15 for discharging the liquid that has passed through the filter plate 132 to the outside. The discharge section 15 includes a discharge pipe 151 connected to a discharge opening formed in the lid body 131, and a second valve 152 that can switch between opening and closing the flow path of the discharge pipe 151. The container 10 also has a pressure reduction section 16 for reducing the pressure inside the container V1. The pressure reduction section 16 includes a pressure reduction pipe 161 connected to a pressure reduction pump (not shown), and a third valve 162 that can switch between opening and closing the flow path of the pressure reduction pipe 161.

As shown in FIG. 5, the side wall 11 has an outlet opening 111 that allows the solid matter collected on the filter plate 132 to be collected from the side of the container 10. The outlet opening 111 is formed in a position that can be horizontally adjacent to the solid matter dried on the filter plate 132. The outlet opening 111 can be switched between open and closed by the opening/closing device 30.

The container 10 of this embodiment is configured to be in a sealed state by the above configuration, so that the container interior V1 can be in a reduced pressure or pressurized state. For example, the container interior V1 can be in a reduced pressure state by driving the decompression pump to open the third valve 162. In addition, the container interior V1 can be in a pressurized state by introducing air or an inert gas such as nitrogen into the container 10 through the inlet pipe 141 that is in an open state.

The stirring device 20 of this embodiment has a rotating shaft 21 as a movable member that is arranged to penetrate the ceiling portion 12 of the container 10, a plurality of rotors 22 that are connected to the lower end portion of the rotating shaft 21 (the end portion arranged inside the container 10) and stir the slurry liquid or the like contained in the container interior V1, a motor 23a and a reducer 23b that rotate the rotating shaft 21 around its axis, and a hydraulic device 24 that moves the rotating shaft 21 in the axial direction.

The movable member is a member that performs some kind of movement, such as rotating, expanding and contracting, or swinging, during operation of the device, and can be the subject of coverage by a covering member.

As shown in Figs. 1 to 3, the rotating shaft 21 is provided to penetrate the ceiling portion 12, and thus has a portion disposed inside the container 10 and a portion disposed outside the container 10. A reducer 23b is attached to the portion of the rotating shaft 21 disposed outside the container 10, and the rotation of the motor 23a is transmitted via the reducer 23b. The rotating shaft 21 is entirely covered by a first bellows 40a inside the container 10, and is covered by a second bellows 40b above the reducer 23b outside the container 10. That is, the filter dryer 1 of this embodiment includes a bellows 40 as a covering member, and the bellows 40 includes an internal bellows 40a that covers the rotating shaft 21 inside the container 10, and an external bellows 40b that covers the rotating shaft 21 outside the container 10.

The covering member here refers to a member that can deform in accordance with the movement of the movable member while maintaining a state in which at least a portion of the movable member is covered, even when the movable member rotates, expands or contracts, or a member that can deform due to the flow of the workpiece caused by the movement of the movable member while maintaining a state in which at least a portion of the movable member is covered.

The rotating shaft 21 is configured to be movable in the axial direction by the hydraulic device 24, and the reducer 23b is configured to transmit the rotation of the motor 23a to the rotating shaft 21 even if the rotating shaft 21 moves in the axial direction. A communication part through which a fluid can communicate is formed at the engagement part between the rotating shaft 21 and the reducer 23b. Therefore, in this embodiment, a first space S1 is formed between the rotating shaft 21 and the internal bellows 40a, and a second space S2 is formed between the rotating shaft 21 and the external bellows 40b, and the first space S1 and the second space S2 are in a state in which a fluid can move through the communication part in the reducer 23b. In other words, in the filter dryer 1 of this embodiment, a fluid flow path is formed that extends from the first space S1 to the second space S2 through the communication part. In the following, this fluid flow path will be referred to as the first flow path P1. Under normal conditions, the first flow path P1 is blocked from the inside of the container V1 by the internal bellows 40a.

As shown in FIG. 5, the opening/closing device 30 of this embodiment has a blocking body 31 that blocks the removal opening 111 formed in the side wall portion 11, an axial member 32 that extends from the blocking body 31 toward the outside of the container 10, a hydraulic device 33 that moves the axial member 32 in the axial direction, and a housing 34 that forms an enclosed space outside the removal opening 111. As a result, the opening/closing device 30 can abut the blocking body 31 against the removal opening 111 to close the removal opening 111, and can move the blocking body 31 away from the removal opening 111 to open the removal opening 111.

Furthermore, in the opening and closing device 30 of this embodiment, the sealed space V2 of the housing 34 is configured to be pressurizable so that the sealing performance of the blocking body 31 with respect to the extraction opening 111 can be confirmed. Specifically, with the extraction opening 111 blocked by the blocking body 31, air or an inert gas such as nitrogen is supplied into the housing 34 to pressurize it, and the sealing performance of the blocking body 31 can be confirmed by monitoring the pressure.
In addition, since the housing 34 is an example of a container in the present invention, the sealed space V2 inside the housing corresponds to the inside of the container in the present invention.

The opening and closing device 30 of this embodiment has a third bellows 40c that covers the entire shaft member 32. A third space S3 is formed between the shaft member 32 and the third bellows 40c, extending along the length of each shaft member 32. That is, in the filter dryer 1 of this embodiment, a fluid flow path is formed that extends between the shaft member 32 and the third bellows 40c. In the following, this fluid flow path will be referred to as the second flow path P2. Under normal conditions, the second flow path P2 is blocked from the inside of the container V2 by the third bellows 40c.

The bellows 40 in this embodiment is made of metal. Examples of the metal include austenitic stainless steels such as SUS316 and SUS304, and nickel alloys containing 40% or more by mass of nickel. The bellows is not limited to being made of metal, and may be made of resin, for example, and a fluororesin such as PTFE is preferable as the resin.

The filter dryer 1 of this embodiment further includes a fluid detection device 50 for detecting damage to each bellows 40. More specifically, as shown in Figures 4 and 5, the filter dryer 1 of this embodiment includes a first fluid detection device 50a (Figure 4) fluidly connected to the first flow path P1 and a second fluid detection device 50b (Figure 5) fluidly connected to the second flow path P2.

The first fluid detection device 50a is configured to detect damage to the internal bellows 40a based on the fluid flow caused by the reduced pressure or pressurized state of the container interior V1, which is a fluid flow that occurs when the container interior V1 and the first flow path P1 are connected due to damage to the internal bellows 40a. The second fluid detection device 50b is configured to detect damage to the third bellows 40c based on the fluid flow caused by the reduced pressure or pressurized state of the container interior V2, which is a fluid flow that occurs when the container interior V2 and the second flow path P2 are connected due to damage to the third bellows 40c.

The first fluid detection device 50a is configured to detect damage to the internal bellows 40a based on the flow of fluid in the first flow path P1 when the internal bellows 40a is not expanding or contracting. Similarly, the second fluid detection device 50b is configured to detect damage to the third bellows 40c based on the flow of fluid in the second flow path P2 when the third bellows 40c is not expanding or contracting. When the normal bellows 40 are not expanding or contracting, no fluid flows in the first flow path P1 and the second flow path P2. Therefore, even a slight flow of fluid in each flow path when the bellows 40 are not expanding or contracting can be considered to be due to damage to each bellows 40.

The first fluid detection device 50a has a measuring device 51a that measures the physical state of the fluid in the first flow path P1, and a control unit (not shown) that determines whether or not damage has occurred to the internal bellows 40a based on the measurement value of the measuring device 51a.

The measuring device 51a of this embodiment is a flow meter connected to the first flow path P1. More specifically, the filter dryer 1 of this embodiment is provided with a connecting member 60 that is disposed on the upper part of the reducer 23b and has an upper end to which the external bellows 40b is connected. The connecting member 60 has a cylindrical main body 61 that surrounds the rotating shaft 21 and a cylindrical connecting part 62 that extends from the side of the main body 61 in the radial direction of the rotating shaft 21. Furthermore, the measuring device (flow meter) 51a has a sensor part 511 that measures the flow rate of the fluid, and is fixed to the sensor mounting member 512 so that the sensor part 511 is disposed in the center of the sensor mounting member 512. The sensor mounting member 512 is a T-shaped piping member, and is configured to have a cylindrical body having a flow path extending linearly from the first end 512a to the second end 512b, and a third end 512c having an opening in the center of the cylindrical body in a direction perpendicular to the flow path. The first end 512a of the sensor mounting member 512 is connected to the connecting portion 62, and the second end 512b is open to atmospheric pressure. Thus, in this embodiment, the first fluid detection device 50a is disposed outside the container 10. The flow meter 51a measures the flow rate of the fluid inside the sensor mounting member 512 and transmits the value to the control unit.

The flow meter 51a of this embodiment is capable of measuring flow rates of 1 mL/min or more and 5 L/min or less.

The first fluid detection device 50a of this embodiment is preferably configured to detect damage to the bellows only when the bellows are not expanding or contracting (i.e., when the bellows are stationary), but may be configured to detect damage to the bellows even when the bellows are expanding or contracting.

The control unit in the first fluid detection device 50a of this embodiment may be configured to determine that damage has occurred to the internal bellows 40a when the measurement value (flow rate value) of the flow meter 51a exceeds a preset threshold value.

The threshold value can be set to a different value when the fluid detection device detects when the bellows are not expanding or contracting and when the fluid detection device detects when the bellows are expanding or contracting.

If the fluid detection device detects only when the bellows is stationary, it is preferable to set the threshold value as small as possible without detecting minute changes due to factors other than damage (i.e., false detection).

On the other hand, when the fluid detection device detects damage to the bellows based on the flow of fluid in the space or the pressure in the space, including when the bellows are expanding or contracting, a value that is slightly higher (e.g., 10 to 20%) than the maximum flow rate that can be measured by the expansion and contraction of the internal bellows 40a under normal conditions can be used. By setting such a flow rate value as the threshold value, it becomes possible to accurately detect only when the bellows is broken, without detecting the expansion and contraction of the bellows during normal operation, even when the bellows is expanding or contracting.

The control unit of this embodiment has a notification unit that notifies the user of the filter dryer 1 of an abnormality when it is determined that the internal bellows 40a has been damaged. For example, the notification unit may be configured to emit an alarm sound, or to light or flash a lamp on a display, a control panel, an operation panel, or the like.

In the present embodiment, when the control unit determines that the internal bellows 40a has been damaged, the filter dryer 1 notifies the user of the abnormality by the notification unit and stops operation. As a method for stopping operation when the container 10 is in a reduced pressure state, it is preferable to, for example, stop the rotation of the rotating shaft 21, close the third valve 162 of the reduced pressure pipe 161, and return the pressure inside the container V1 to near atmospheric pressure through a purge line (not shown) capable of supplying air or an inert gas. As a method for stopping operation when the container 10 is in a pressurized state, it is preferable to, for example, stop the rotation of the rotating shaft 21, close the first valve 142 of the introduction pipe 141 to stop the supply of pressurized gas, close the second valve 152 to stop the discharge of liquid matter, discharge gas from the container inside V1 through a drain line (not shown) connected to atmospheric pressure, and return the pressure inside the container V1 to near atmospheric pressure.

As shown in FIG. 5, the second fluid detection device 50b has a measuring device 51b that measures the physical state of the fluid in the second flow path P2, and a control unit (not shown) that determines whether or not damage has occurred to the third bellows 40c based on the measurement value by the measuring device 51b.

The measuring device 51b in this embodiment is a flowmeter connected to the second flow path P2. More specifically, the opening and closing device 30 in this embodiment includes a cylindrical connecting member 35 that is fluidly connected to the second flow path P2 and extends outside the housing 34. The connecting member 35 has a connecting end 351 that is arranged outside the housing 34 and to which the flowmeter 51b is connected. On the other hand, the flowmeter 51b is configured in the same manner as the flowmeter 51a, has a sensor unit that measures the flow rate of the fluid, and is fixed to the sensor mounting member 513 so that the sensor unit is located in the center of the sensor mounting member 513. The sensor mounting member 513 is configured in the same manner as the above-mentioned sensor mounting member 512. The flowmeter 51a measures the flow rate of the fluid inside the sensor mounting member 513 and transmits the value to the control unit.

The second fluid detection device 50b is preferably configured to detect damage to the bellows when the bellows does not expand or contract, similar to the first fluid detection device 50a. The control unit in the second fluid detection device 50b may be configured to determine that damage has occurred in the third bellows 40c when the measurement value (flow rate value) of the flow meter 51b exceeds a preset threshold value. As with the internal bellows 40a described above, the threshold value is preferably set to as small a value as possible without detecting minute changes due to factors other than damage (i.e., false detection).

In the filter dryer 1 of this embodiment, when the second fluid detection device 50b determines that the third bellows 40c has been damaged, the notification unit notifies the user of the abnormality, the operation is stopped, and the pressure inside the container V2 of the housing 34 is preferably returned to near atmospheric pressure by a purge line (not shown) that is connected to atmospheric pressure or that can supply an inert gas.

Next, an anomaly detection method according to one embodiment of the present invention will be described using an example in which it is applied to the above-mentioned filter dryer 1.

In the anomaly detection method of this embodiment, as a preparation step before processing the workpiece in the filter dryer 1, the first fluid detection device 50a may be used to check the state (check for damage) of the internal bellows 40a before use. Similarly, the second fluid detection device 50b may be used to check the state (check for damage) of the third bellows 40c before use.

In the pre-use condition check, the container 10 and the housing 34 are placed in a reduced pressure or pressurized state. At this time, it is preferable that the pressure in the container 10 is 0.1 MPa or more in gauge pressure. Then, when the first fluid detection device 50a detects that the flow rate in the first flow path P1 is less than the threshold value, and the second fluid detection device 50b detects that the flow rate in the second flow path P2 is less than the threshold value, it is determined that there is no damage to the bellows and the filter dryer 1 is usable. This allows the filter dryer 1 to be used safely.

In addition, in the anomaly detection method of this embodiment, when the filter dryer 1 is performing reduced pressure filtration or pressure filtration, and even when the filter dryer 1 is performing reduced pressure drying, the first fluid detection device 50a is used continuously to detect damage to the internal bellows 40a, and the second fluid detection device 50b is used to detect damage to the third bellows 40c. This allows damage to any of the bellows 40 to be promptly detected while the filter dryer 1 is in operation.

The structure with a covering member, the filter, and the anomaly detection method according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the present invention.

For example, in the above embodiment, the fluid detection device 50 is provided with a flow meter as the measuring device 51, but the present invention is not limited to this, and the fluid detection device may be provided with a pressure gauge as the measuring device. In the case of a pressure gauge, a valve is installed downstream of the pressure gauge so that the first flow path and the second flow path are sealed systems that are not open to atmospheric pressure during measurement.

Even if the fluid detection device is equipped with a pressure gauge, it is preferable to configure it so that it determines that damage has occurred to the covering member, such as a bellows, based on a change in pressure when the covering member is not expanding or contracting. The fluid detection device is preferable to configure it so that it determines that damage has occurred to the covering member when the measurement value of the pressure gauge exceeds a preset threshold value. The threshold value can be set to a value that is high or low enough to prevent erroneous detection from the normal value, with the pressure in a closed system being the normal value.

The fluid detection device may be configured to detect damage to the covering member based on the components contained in the fluid (liquid or gas). In this case, the fluid detection device may be equipped with a fluid sensor that detects the fluid as the measuring device, and the fluid sensor is preferably a gas sensor. In addition, the components to be detected are preferably an inert gas such as nitrogen used to return the container 10 to atmospheric pressure after vacuum drying, an inert gas such as nitrogen introduced into the container 10 during pressure filtration, and a vaporized component of an organic solvent contained in the slurry liquid. When the container 10 or the housing 34 is pressurized, if the covering member is damaged, these gas components flow through the first flow path or the second flow path due to the pressure difference between the inside of the container and the space and reach the measuring device 51, so that when these gas components are detected, it can be immediately determined that the covering member is damaged.

Furthermore, the fluid detection device may have two or more measuring instruments selected from the group consisting of the flow meter, the pressure meter, and the fluid sensor.

In the above embodiment, the fluid detection device is indirectly connected to the space via the connecting member, but the present invention is not limited to this, and the fluid detection device may be directly connected to the space.

In addition, in the above embodiment, the case where each of the movable shaft members is entirely covered by the bellows, which is a covering member, is described, but the present invention is not limited to this, and each of the movable shaft members may be only partially covered by a covering member.

In addition, in the above embodiment, a case was described in which a bellows was used as the covering member, but the present invention is not limited to this, and a member other than a bellows can be used.

In addition, in the above embodiment, a shaft member is provided as the movable member, but the present invention is not limited to this, and a member other than a shaft member can be used.

1... filtration dryer, 10: container, 11: side wall, 111: removal opening, 12: ceiling, 13: lower lid, 131: lid body, 132: filter plate, 14: inlet, 141: inlet pipe, 142: first valve, 15: outlet, 151: outlet pipe, 152: second valve, 16: pressure reduction section, 161: pressure reduction pipe, 162: third valve, 20: agitator, 21: rotating shaft, 22: rotor, 23a: motor, 23b: reducer, 24: hydraulic device, 30: opening and closing device, 31: obstruction body, 32: shaft member, 33: hydraulic device, 34: housing, 35: connecting member, 351: connecting end, 40: bellows, 40a: second 1 bellows (internal bellows), 40b: second bellows (external bellows), 40c: third bellows, 50: fluid detection device, 50a: first fluid detection device, 50b: second fluid detection device, 51a: measuring device, 511: sensor part, 512: sensor mounting member, 512a: first end, 512b: second end, 512c: third end, 513: sensor mounting member, 60: connecting member, 61: main body part, 62: connecting part, V1: inside of container, V2: sealed space of housing (inside of container), S1: first space, S2: second space, S3: third space, P1: first flow path, P2: second flow path

Claims (7)

A container capable of reducing or increasing the pressure inside the container;
A movable member disposed inside the container;
A covering member that covers at least a portion of the movable member;
A fluid detection device,
A space is formed between the movable member and the covering member,
A structure with a covering member, wherein the fluid detection device is configured to detect damage to the covering member based on a fluid flow or pressure fluctuation in the space caused by a reduced pressure or pressurized state inside the container that occurs when the interior of the container and the space become connected due to damage to the covering member. The structure with a covering member according to claim 1, wherein the fluid detection device is configured to detect damage to the covering member based on the flow of fluid or pressure fluctuations in the space when the covering member is not expanding or contracting. The structure with a coated member according to claim 1, wherein the fluid detection device is equipped with a measuring device that measures the flow rate of the fluid or the pressure in the space, and is configured to detect damage to the coated member based on a preset threshold value for the flow rate or pressure and the measured value for the flow rate or pressure. The fluid sensing device is disposed outside the container;
The structure with a coated member according to claim 1 , further comprising a flow path for allowing a fluid to communicate between the space and the fluid detection device. A filter comprising the structure with a coated member according to any one of claims 1 to 4,
The container has a filtration section,
The movable member has a rotating shaft and a rotor connected to the rotating shaft,
The filter, wherein the covering member is configured to cover at least a portion of the rotating shaft. A method for detecting an abnormality in a structure with a covering member, comprising:
The structure with a coated member is
A container capable of reducing or increasing the pressure inside the container;
A movable member disposed inside the container;
a covering member that covers at least a portion of the movable member,
A space is formed between the movable member and the covering member,
An anomaly detection method for detecting damage to a covering member based on a fluid flow or pressure fluctuation in the space caused by a reduced pressure or pressurized state inside the container, which occurs when the inside of the container and the space become connected due to damage to the covering member. The abnormality detection method according to claim 6, in which the inside of the container is depressurized or pressurized before the structure with the covering member is used, and the state of the covering member is determined based on the flow of fluid or pressure fluctuation in the space caused by the depressurized or pressurized state.