JP7204540B2 - DAMAGE DETECTION DEVICE FOR FLUID MACHINE AND FLUID MACHINE - Google Patents

Description

An embodiment of the present invention relates to a fluid machinery damage detection device and a fluid machinery.

In general, a fluid machine may suffer damage such as wear, erosion, corrosion, destruction, or rupture under the influence of working fluid flowing inside. Such damage is affected by the environment in which the fluid machinery is used, the operating conditions, and the like.

In hydraulic machinery and pumps, which are examples of fluid machinery, the flow path is defined by contacting or colliding with the surface of a flow path defining member that defines the flow path of the working fluid with foreign matter such as earth and sand contained in the working fluid. Members may be damaged by sediment wear and the like.

The location of occurrence of such damage and the degree of progression can be predicted to some extent based on past experience, tests during product development, and the like. However, it may be affected by changes in operating conditions, the amount and properties of foreign matter in the working fluid, etc., so detailed prediction in an actual machine that is actually in operation is difficult.

In order to cope with such a problem, a system is known in which a vibration sensor is used to detect vibration at the time of damage and inform the user of the damage. However, in such systems, the noise sensed by the vibration sensor can be a hindrance and reduce the accuracy of damage detection.

Japanese Patent No. 5185064 Japanese Patent No. 4812100 Japanese Patent No. 4580601

SUMMARY OF THE INVENTION The present invention has been made in consideration of such points, and is capable of improving the accuracy of detecting damage to a flow path defining member that defines a flow path through which a working fluid flows. The purpose is to provide a machine.

A damage detection device for a fluid machine according to an embodiment is a damage detection device for a fluid machine that detects damage to a flow path defining member that defines a flow path through which a working fluid flows. This damage detection device for a fluid machine includes an electric circuit including a sensor conductor provided in a flow path defining member, a power supply unit for causing current to flow through the electric circuit, and a detection unit for detecting changes in the current flowing through the electric circuit. I have.

A fluid machine according to an embodiment includes a flow path defining member that defines a flow path through which a working fluid flows, and the fluid machine damage detection device described above.

ADVANTAGE OF THE INVENTION According to this invention, the detection accuracy of the damage of the flow-path defining member which defines the flow path through which a working fluid flows can be improved.

FIG. 1 is a view showing a fluid machinery damage detection device according to a first embodiment together with a meridional cross section of a Francis turbine 1, which is an example of a fluid machinery. 2 is a partially enlarged view showing the damage detection device of FIG. 1. FIG. 3 is a partially enlarged view showing a modification of the damage detection device shown in FIG. 1. FIG. FIG. 4 is a partially enlarged view showing another modification of the damage detection device shown in FIG. FIG. 5A is a partially enlarged view showing a fluid machinery damage detection device according to a second embodiment. FIG. 5B is a close-up view of a variation of FIG. 5A. FIG. 6 is a partially enlarged view showing a modification of the damage detection device shown in FIG. 5A. FIG. 7 is a partially enlarged view showing another modification of the damage detection device shown in FIG. 5A. FIG. 8 is a partially enlarged view showing another modification of the damage detection device shown in FIG. 5A. FIG. 9 is a partially enlarged view showing a damage detection device for fluid machinery according to a third embodiment. FIG. 10 is a partially enlarged view showing a damage detection device for fluid machinery according to a fourth embodiment.

Hereinafter, a fluid machine damage detection device and a fluid machine according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, a damage detection device for fluid machinery according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. First, a Francis turbine (hydraulic machine), which is an example of a fluid machine, will be described with reference to FIG. Water flows as the working fluid in the Francis turbine.

As shown in FIG. 1, a Francis turbine 1 includes a spiral casing 2 into which water flows from an upper reservoir through a penstock (both not shown), a plurality of stay vanes 3, and a plurality of guides. It has vanes 4 and runners 5 .

The stay vanes 3 are for guiding the water that has flowed into the casing 2 to the guide vanes 4 and the runners 5, and are arranged at predetermined intervals in the circumferential direction. Flow paths are formed between the stay vanes 3 through which water flows.

The guide vanes 4 are for guiding the inflowing water to the runners 5, and are arranged at predetermined intervals in the circumferential direction. Channels through which water flows are formed between the guide vanes 4 . Each guide vane 4 is configured to be rotatable, and by rotating each guide vane 4 to change the opening formed by the adjacent guide vanes 4, the flow rate of water flowing into the runner 5 is increased. Adjustable. In this way, it is possible to adjust the power generation amount of the water turbine generator, which will be described later.

The runner 5 is configured to be rotatable about the rotation axis with respect to the casing 2, and is rotationally driven by water flowing in from the casing 2 during operation of the water turbine. That is, the runner 5 is for converting fluid energy of water flowing into the runner 5 into rotational energy.

The runner 5 includes a crown 5a connected to the lower end of a runner shaft 6, which will be described later, a band 5b provided on the outer peripheral side of the crown 5a, and a plurality of runner blades 5c provided between the crown 5a and the band 5b. and have Among these, the runner blades 5c are arranged at predetermined intervals in the circumferential direction and fixed to the crown 5a and the band 5b. Channels through which water flows are formed between the runner blades 5c.

A water turbine generator (not shown) is connected to the runner 5 via a runner shaft 6 . This water turbine generator is configured to generate power by transmitting the rotational energy of the runner 5 during operation of the water turbine.

A draft pipe 7 (also referred to as a draft pipe) is provided downstream of the runner 5 during turbine operation. This draft pipe 7 is connected to a lower pond (or a discharge channel) (not shown), recovers the pressure of the water that has rotationally driven the runner 5, and discharges it into the lower pond.

An upper cover 8 is provided above the guide vanes 4, and a lower cover 9 is provided below them. A guide vane 4 is arranged between an upper cover 8 and a lower cover 9 to form a channel through which water flows. A part of the upper cover 8 extends above a crown 5a of the runner 5, which will be described later, and a back pressure chamber 10 is formed between the crown 5a and the crown 5a. Part of the water that has passed through the guide vanes 4 flows into the back pressure chamber 10 . A part of the lower cover 9 extends outside (laterally) of a band 5b of the runner 5, which will be described later, and a side pressure chamber 11 is formed. Part of the water that has passed through the guide vanes 4 flows into the side pressure chamber 11 .

Note that the Francis turbine 1 according to the present embodiment may be configured as a Francis pump turbine capable of pumping water as a pump turbine. In this case, the water turbine generator also functions as an electric motor, and is configured to rotate the runner 5 by being supplied with electric power. Therefore, it is possible to suck up water from the lower pond through the suction pipe 7 and discharge it to the upper pond. The opening of the guide vanes 4 is changed according to the lift of the pump so as to obtain an appropriate amount of pumped water.

The casing 2, the stay vanes 3, the guide vanes 4, the runner 5, the draft pipe 7, the upper cover 8 and the lower cover 9 described above define a channel through which water flows (see symbol F shown in FIGS. 1 and 2). It constitutes a delimiting member. When water flows through such a channel, the channel defining member may come into contact with foreign matter such as earth and sand contained in the water, and damage such as abrasion, erosion, corrosion, destruction or bursting may occur. A fluid machinery damage detection device 20 (hereinafter simply referred to as damage detection device 20) according to the present embodiment is a device for detecting the occurrence of such damage. A case will be described below in which the damage detection device 20 is provided on the upper cover 8 as an example of the flow path defining member in the Francis turbine 1 as an example of the fluid machine. Since the defining surface of the flow path defining member that defines the main flow path is a surface that is subject to damage, it is preferable that the damage detection device 20 be installed so as to detect damage on such a defining surface. . Here, the mainstream refers to the flow through the casing 2, stay vanes 3, guide vanes 4, runners 5 and draft pipes 7. Although the flow of water in the back pressure chamber 10 and the side pressure chamber 11 described above is distinguished from the mainstream, depending on the usage environment of the Francis turbine 1, the defining surfaces that define the back pressure chamber 10 and the side pressure chamber 11 are also damaged. Since it can be a plane, it may be possible to detect damage in these defining planes.

As shown in FIGS. 1 and 2, the damage detection device 20 according to the present embodiment includes an electric circuit 30 including a sensor conductor 31 provided on the upper cover 8 (flow path defining member) and a current flowing through the electric circuit 30. A power supply unit 40 for supplying current and a detection unit 41 for detecting a change in the current flowing through the electric circuit 30 are provided.

The electrical circuit 30 includes a pair of electrically conductive cables 32 electrically connected to the sensor conductors 31 described above. The cable 32 is connected to the power supply section 40 described above. That is, the sensor conductor 31 is electrically connected to the power supply section 40 via a pair of cables 32 . With such a configuration, an electric current (see symbol I shown in FIG. 2) flows through the electric circuit 30 formed by the sensor conductor 31 and the cable 32 .

In this embodiment, the sensor conductor 31 is embedded within the upper cover 8 . For example, the sensor conductor 31 may be embedded in the upper cover 8, as shown in FIG. In this case, a hole may be previously formed in the upper cover 8 and the sensor conductor 31 may be inserted into this hole. After inserting the sensor conductor 31 , the hole may be filled with a filler such as resin to fix the sensor conductor 31 to the upper cover 8 . 1 and 2 show an example in which one sensor conductor 31 is embedded in the upper cover 8 and one electric circuit 30 constitutes the damage detection device 20 .

The sensor conductor 31 includes a sensor portion 33 facing the defining surface 8 a of the upper cover 8 and a sensor connection portion 34 extending from the sensor portion 33 and connected to the cable 32 . That is, the sensor portion 33 is a portion of the sensor conductor 31 embedded in the upper cover 8 that faces the defining surface 8a of the upper cover 8, and the sensor connection portion 34 is a portion that extends in the thickness direction of the upper cover 8. be.

The sensor section 33 is embedded at a desired position with respect to the defining surface 8a of the upper cover 8. As shown in FIG. The distance between the sensor part 33 and the delimiting surface 8a is determined by considering the use environment of the Francis turbine 1, the operating state, etc., and when the damage of the upper cover 8 exceeds the allowable range, the damage of the upper cover 8 is detected. It may be set as a distance that can be set.

The sensor conductor 31 is made of a material having electrical conductivity. However, it is not limited to good electrical conductivity. In other words, a material having relatively high electrical resistance may be used as long as it has electrical conductivity. For example, it may be made of steel, which has a higher electrical resistance than copper.

Moreover, the sensor conductor 31 is preferably made of a relatively hard material such as steel rather than a relatively soft material such as copper. This prevents the sensor portion 33 of the sensor conductor 31 from failing to break when the sensor conductor 31 is exposed to the flow path due to damage to the upper cover 8 . That is, when the sensor conductor 31 is made of a soft material, even if a foreign object such as earth and sand contained in water collides with the sensor conductor 31, the sensor conductor 31 can be deformed to avoid breakage. have a nature. Therefore, by forming the sensor conductor 31 with a hard material, it is possible to prevent such deformation and to break the sensor conductor 31 when it is exposed to the flow path due to the damage of the upper cover 8 .

As shown in FIGS. 1 and 2, the detection unit 41 according to the present embodiment includes a lamp 42 (display unit) that switches between lighting and extinguishing in accordance with changes in the current flowing through the electric circuit 30 (in this case, presence or absence of current). have. As a result, the lamp 42 detects the presence or absence of current flowing through the electric circuit 30, and switches between lighting and extinguishing according to the presence or absence of the detected current. Therefore, by checking whether the lamp 42 is on or off, the observer can recognize changes in the current flowing through the electric circuit 30 . For example, the lamp 42 may be turned on when current is flowing through the electric circuit 30, and the lamp 42 may be turned off when no current is flowing through the electric circuit 30. FIG. Alternatively, the lamp 42 may be turned on when no current is flowing through the electric circuit 30, and the lamp 42 may be turned off when current is flowing. In this case, a relay, which will be described later, may be provided in the electric circuit 30, and the display may be connected to the output contact of this relay.

As shown in FIGS. 1 and 2, in the present embodiment, a display 43 is used in which the power supply section 40 and the lamp 42 described above are integrated. That is, the indicator 43 shown in FIGS. 1 and 2 has a power supply section 40 that causes current to flow through the electric circuit 30 and a lamp 42 that displays the presence or absence of current flowing through the electric circuit 30 . The indicator 43 can be installed at any position, but may be installed, for example, in the control room of the power plant where the Francis turbine 1 is installed. In this case, the display of the lamp 42 of the indicator 43 can be easily confirmed, and the presence or absence of damage to the upper cover 8 can be quickly confirmed.

The operation of this embodiment having such a configuration will be described.

During operation of the Francis turbine 1 shown in FIG. 1 , water that has flowed from the upper pond through the penstock into the casing 2 flows into the runner 5 through the stay vanes 3 and the guide vanes 4 . When the runner 5 is driven to rotate and discharged from the runner 5, it passes through the draft pipe 7 and flows into the lower pond.

During normal operation, the electrical circuit 30 of the damage detection device 20 is in an energized state in which current flows. Therefore, when the power supply unit 40 applies a predetermined voltage to the electric circuit 30 , current flows through the electric circuit 30 , and the lamp 42 detects that the electric current is flowing through the electric circuit 30 and lights up. An observer who confirms the lighting of the lamp 42 can recognize that the sensor portion 33 of the sensor conductor 31 is not broken.

However, the water flowing through the Francis turbine 1 may contain foreign matter such as earth and sand. Then, at least one of the flow path defining members including casing 2, stay vanes 3, guide vanes 4, upper cover 8, lower cover 9, runner 5, draft tube 7 and various other turbine components of Francis turbine 1 , may be damaged by sediment wear, etc. That is, it is conceivable that sediment wear may occur on the surfaces of these flow path defining members. Sediment wear refers to damage caused by foreign matter such as sediment contained in the working fluid coming into contact with or colliding with the surface of the flow path defining member.

For example, as shown in FIG. 2, when the upper cover 8 is damaged, the defining surface 8a of the upper cover 8 is scraped off. As the damage progresses, the defining surface 8a recedes, exposing the sensor portion 33 of the sensor conductor 31 embedded in the upper cover 8 to the flow path. When a foreign object such as earth and sand collides with the exposed sensor portion 33, the sensor portion 33 is broken, and a broken portion B is formed. The breakage portion B cuts the sensor conductor 31, and the electric circuit 30 is brought into a non-conducting state in which no current flows. Therefore, the lamp 42 detects that no current is flowing through the electric circuit 30 and turns off. An observer who confirms that the lamp 42 is turned off can recognize that the sensor portion 33 of the sensor conductor 31 has been broken.

In this manner, the damage detection device 20 according to the present embodiment can monitor whether the upper cover 8 is damaged due to sand wear. In addition to the case where the sensor conductor 31 is provided on the upper cover 8, the present embodiment also includes the case where the sensor conductor 31 is provided on an arbitrary member other than the upper cover 8 in the Francis turbine 1 as described later. The damage detection device 20 allows detailed understanding of the location of damage in the Francis turbine 1 and the speed at which the damage progresses, which can be used for operation planning, periodic inspection planning, repair planning, aging backward planning, and the like.

Here, there are flow paths such as between the blades of the runner 5, near the inlet of the back pressure chamber 10 between the runner 5 and the upper cover 8, and near the inlet of the side pressure chamber 11 between the runner 5 and the lower cover 9. Cavitation may occur in the abruptly narrowed portion (narrow portion) depending on the operating conditions. Cavitation is a phenomenon in which water evaporates and forms bubbles when the pressure drops below the saturated vapor pressure due to an increase in flow velocity. When this cavitation collapses, a shock wave is generated. As a result, when cavitation occurs, in addition to the generation of vibration and noise, erosion of the blades is accompanied, and it is possible to damage members in the vicinity of the cavitation occurrence part, such as the runner 5, the upper cover 8, and the lower cover 9. gender can be considered.

On the other hand, in this embodiment, the sensor conductor 31 of the electric circuit 30 is provided on the upper cover 8 . This makes it possible to detect the presence or absence of damage including erosion due to cavitation near the entrance of the back pressure chamber 10 . In this way, in order to investigate the influence of cavitation that may occur near the inlet of the back pressure chamber 10, the sensor conductor 31 may be provided in the flow path defining member forming the narrow portion of the inlet. It is preferable to provide the sensor conductor 31 on the flow path defining member configured as a stationary body rather than on the runner 5 . This makes it possible to easily detect whether or not there is erosion due to cavitation near the entrance of the back pressure chamber 10 . Similarly, when examining the influence of cavitation in the vicinity of the inlet of the side pressure chamber 11, it is preferable to provide the sensor conductor 31 in the flow path defining member that constitutes the inlet of the side pressure chamber 11 and is configured as a stationary body. .

As described above, according to the present embodiment, the presence or absence of current flowing through the electric circuit 30 including the sensor conductor 31 is detected by the detection section 41 . As a result, when the detection section 41 detects that a current flows through the electric circuit 30, it can be recognized that the sensor section 33 of the sensor conductor 31 is not broken. On the other hand, when the detection section 41 detects that no current is flowing through the electric circuit 30, it can be recognized that the sensor section 33 of the sensor conductor 31 is broken. Therefore, it is possible to easily detect that the sensor portion 33 of the sensor conductor 31 is broken.

Further, according to the present embodiment, the sensor conductor 31 is provided on the upper cover 8 of the Francis turbine 1 as described above. As a result, when the upper cover 8 is damaged by foreign matter such as earth and sand contained in water, the sensor conductor 31 can be damaged and broken. Therefore, it is possible to accurately detect the presence or absence of damage to the upper cover 8 that defines the flow path through which water flows. As a result, the accuracy of detecting damage to the upper cover 8 can be improved.

Further, according to the present embodiment, the detection unit 41 has the lamp 42 that switches between lighting and extinguishing according to the presence or absence of current flowing through the electric circuit 30 . This makes it possible to easily confirm changes in the current flowing through the electric circuit 30 . Moreover, the structure of the detection part 41 can be simplified.

Further, according to this embodiment, the sensor conductor 31 of the electric circuit 30 is embedded within the upper cover 8 . As a result, damage to the upper cover 8 can be detected when the damage to the upper cover 8 has progressed to some extent. Therefore, it is possible to prevent erroneous detection that the damage of the upper cover 8 is detected when the damage of the upper cover 8 is tolerable, and the detection accuracy of the damage of the upper cover 8 can be improved. can.

In the present embodiment described above, an example has been described in which detection unit 41 has lamp 42 that switches between lighting and extinguishing according to the presence or absence of current flowing through electric circuit 30 . However, the present invention is not limited to this, and as long as the presence or absence of current flowing through the electric circuit 30 can be displayed, the lamp 42 may be other than the lamp 42 that switches between lighting and extinguishing. Optional. Further, the presence or absence of current flowing through the electric circuit 30 may be notified by the notification unit 44 (see FIGS. 1 and 2) such as a warning sound or buzzer, instead of being displayed. That is, the detection unit 41 may have the notification unit 44 that notifies the presence or absence of current flowing through the electric circuit 30 . For example, the electric circuit 30 may be muted while current is flowing, and a warning sound or the like may be emitted when the electric circuit 30 is not energized. In this case as well, the presence or absence of current flowing through the electric circuit 30 can be detected. Switching between lighting and extinguishing of the lamp 42 is not limited to depending on the presence or absence of current as long as it depends on the change in the current flowing through the electric circuit 30 . For example, the current flowing through the electric circuit 30 may be measured, and switching between lighting and extinguishing of the lamp 42 may be performed according to changes in the measured current value. Furthermore, the detection unit 41 may be configured as a measuring instrument 62, which will be described later, or may be configured to mechanically indicate the presence or absence of current using a motor, an electromagnet, or the like.

Further, in the present embodiment described above, an example in which current continues to flow through the electric circuit 30 of the damage detection device 20 during normal operation has been described. However, the present invention is not limited to this, and the presence or absence of damage may be checked by passing a current through the electric circuit 30 at any timing. For example, a current may be passed through the electrical circuit 30 at regular time intervals to periodically check for damage.

Further, in the present embodiment described above, an example in which the sensor conductor 31 of the electric circuit 30 is embedded in the upper cover 8 by being inserted into a hole formed in the upper cover 8 has been described. However, the present invention is not limited to this, and the sensor conductors 31 may be embedded in the upper cover 8 using a module member 51 as shown in FIG. In the example shown in FIG. 3, an installation hole 50 is provided in the upper cover 8, and a module member 51 having sensor conductors 31 embedded therein is installed in the installation hole 50. As shown in FIG.

In the example shown in FIG. 3, the sensor conductor 31 is first embedded in the module member 51 . For example, holes are formed in the module member 51 in advance. The sensor conductor 31 may be inserted into this hole. After the sensor conductors 31 are inserted into the module member 51 , the holes may be filled with a filler such as resin to fix the sensor conductors 31 to the module member 51 . Alternatively, the module member 51 may be halved lengthwise, grooves may be formed in the mating surfaces, the sensor conductors 31 may be inserted into the grooves, and the halved members may be butted and joined together. An installation hole 50 into which the module member 51 can be inserted may be formed in the upper cover 8 , and the module member 51 may be inserted into the installation hole 50 and fixed to the upper cover 8 . For example, the module member 51 may be fixed to the upper cover 8 by welding, adhesion, or the like. Then, the module member 51 may be fixed in the installation hole 50 by screwing together the male threaded portion and the female threaded portion.

In the example shown in FIG. 3, the module member 51 is fixed to the upper cover 8 so as to be flush with the defining surface 8a of the upper cover 8. As shown in FIG. In this case, it is possible to prevent unevenness from being formed on the defining surface 8a of the upper cover 8, and to suppress loss in the flow of water. In addition, in the example shown in FIG. 3, the module member 51 exists in a portion of the installation hole 50 on the side of the flow path. Therefore, the module member 51 does not exist in the portion of the installation hole 50 opposite to the flow path, and the cable 32 of the electric circuit 30 may pass therethrough.

Note that the module member 51 may be made of a material having the same mechanical properties as the material of the top cover 8 . For example, module member 51 may be made of the same material as top cover 8 .

According to the example shown in FIG. 3, the sensor conductor 31 can be easily embedded in the upper cover 8, and the installation work of the damage detection device 20 can be simplified.

Moreover, in the present embodiment described above, an example in which the damage detection device 20 is configured by one electric circuit 30 in the upper cover 8 has been described. However, the present invention is not limited to this. For example, as shown in FIG. 4, the damage detection device 20 may be composed of a plurality of electric circuits 30 each including a sensor conductor 31. FIG.

The example shown in FIG. 4 shows an example in which the damage detection device 20 includes three electric circuits 30 and three indicators 43 (power supply unit 40, lamp 42). Each electrical circuit 30 includes a sensor conductor 31 , each sensor conductor 31 embedded within the top cover 8 . The sensor conductors 31 in the upper cover 8 are arranged at different positions when viewed from the flow path side. The sensor conductors 31 may be arranged at different positions in the mainstream direction, and may be arranged at different positions in the direction along the defining surface 8a of the upper cover 8 and in the direction perpendicular to the mainstream direction. Arrangement of the conductor 31 is arbitrary.

According to the example shown in FIG. 4, the sensor conductors 31 can be arranged at a plurality of different locations on the upper cover 8 . Therefore, the presence or absence of damage can be detected at a plurality of locations on the upper cover 8 .

Furthermore, in the present embodiment described above, the example in which the sensor conductor 31 of the electric circuit 30 is provided on the upper cover 8 has been described. However, it is not limited to this, and among the Francis turbine 1, the flow path defining members that define the flow path of water, that is, the casing 2, the stay vane 3, the guide vane 4, the lower cover 9, the runner 5, the suction It may be provided in at least one of the flow path defining members including the pipes 7 and various other water wheel components.

(Second embodiment)
Next, a damage detection device for fluid machinery and a fluid machinery according to a second embodiment will be described with reference to FIGS. 5A to 8. FIG.

The second embodiment shown in FIGS. 5A to 8 is mainly different in that the detection unit measures the current value flowing through the electric circuit and displays the measured current value. It is substantially the same as the first embodiment shown in FIGS. 5A to 8, the same parts as in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, as shown in FIG. 5A, the detector 41 is configured to measure the current value flowing through the electric circuit 30 and display the measured current value. That is, the detection unit 41 is configured as a measuring device 62 having a measurement unit 60 that measures the value of current flowing through the electric circuit 30 and a display unit 61 that displays the current value measured by the measurement unit 60 . Data on the current value measured by the measuring device 62 includes information on changes in the current. Therefore, the measurement unit 60 can detect changes in the current flowing through the electric circuit 30 . The display mode of the current value on the display unit 61 may be analog or digital, and is optional. The power supply section 40 may also be integrated with the measuring instrument 62 .

Also, the electric circuit 30 according to the present embodiment has a first circuit 30a, a second circuit 30b, and a third circuit 30c. The first circuit 30a, the second circuit 30b and the third circuit 30c are provided in parallel with each other. The sensor conductors 31 include a first sensor conductor 31a provided in the first circuit 30a, a second sensor conductor 31b provided in the second circuit 30b, a third sensor conductor 31c provided in the third circuit 30c, have. The damage detection device 20 according to this embodiment includes one measuring device 62 , and the one measuring device 62 detects changes in the current flowing through the electric circuit 30 . That is, one measuring instrument 62 can detect whether or not the sensor portions 33 of the plurality of sensor conductors 31a to 31c are broken. The measuring instrument 62 is connected via a pair of cables 32 to the first circuit 30a, the second circuit 30b and the third circuit 30c. Each circuit 30a-30c includes a cable portion 32a-32c connected to cable 32 and a sensor connection 34a-34c connecting the cable portions 32a-32c to sensor conductors 31a-31c, respectively. Resistors 35a-35c, which will be described later, are provided in one cable portion 32a-32c in each of the circuits 30a-30c.

The first sensor conductor 31a, the second sensor conductor 31b, and the third sensor conductor 31c are arranged at different positions when viewed from the flow path side. Each of the sensor conductors 31a to 31c may be arranged at different positions in the mainstream direction, or may be arranged at different positions in the direction along the defining surface 8a of the upper cover 8 and in the direction perpendicular to the mainstream direction. Well, the arrangement of each sensor conductor 31a-31c is arbitrary.

The electrical resistance value of the first circuit 30a, the electrical resistance value of the second circuit 30b, and the electrical resistance value of the third circuit 30c are different from each other. In this embodiment, as shown in FIG. 5A, the first circuit 30a includes a first resistor 35a connected in series with the first sensor conductor 31a, and the second circuit 30b connects the second sensor conductor 31b. Including a second resistor 35b connected in series, the third circuit 30c includes a third resistor 35c connected in series with a third sensor conductor 31c. It is preferable that the electrical resistance value R1 of the first resistor 35a, the electrical resistance value R2 of the second resistor 35b, and the electrical resistance value R3 of the third resistor 35c are different from each other. A combined resistance value R0 of the electric circuit 30 is as follows.

It is assumed that the electrical resistance values of the circuits 30a-30c are negligibly smaller than the electrical resistance values R1-R3 of the corresponding resistors 35a-35c. In this case, the electrical resistance values R1 to R3 of the respective resistors 35a to 35c become the electrical resistance values of the corresponding circuits 30a to 30c, resulting in a combined resistance value R0 as shown in equation (1).

When any one of the first sensor conductor 31a, the second sensor conductor 31b and the third sensor conductor 31c breaks, the combined resistance value R0 changes. Therefore, the value of the current flowing through the electric circuit 30 changes. A change in the current value is detected by the measuring section 60 of the detecting section 41 .

That is, the current value of the electric circuit 30 is measured by the measurement unit 60 of the detection unit 41 before the breakage, and the measured current value is displayed on the display unit 61 . At this time, the observer who confirmed the current value displayed on the display unit 61 can recognize that the sensor conductors 31a to 31c are not broken. If the relationship between the presence or absence of rupture of each sensor conductor 31a to 31c and the current value is obtained in advance by calculation or experiment, etc., and stored in a database, the presence or absence of rupture of the sensor conductor can be determined when the current value is confirmed. It is possible to easily know which sensor conductor has broken (break point). Also, such a database may be stored in advance in a computer or the like. That is, as shown in FIG. 5B, the detection unit 41 includes a measurement unit 60 that measures the value of the current flowing through the electric circuit 30, and a determination unit 63 that determines the damaged portion of the flow path defining member based on the measured current value. , may have In this case, the computer 64 having the determination unit 63 reads the measured current value, and the determination unit 63 refers to the database to automatically determine whether or not the sensor conductor is broken and the location of the breakage based on the measured current value. You may make it judge to. The determination result may be displayed on the display unit 65 . In this case, it is possible to easily know the presence or absence of damage to the flow path defining member and the location of the damage.

Then, as shown in FIG. 5A, even after one of the three sensor conductors 31a to 31c is broken, the current value of the electric circuit 30 is similarly measured, and the measured current value is It is displayed on the display unit 61 . In this case, the current value displayed on the display unit 61 is displayed as a value different from the current value before the fracture. Thereby, the change in the current value of the electric circuit 30 is detected by the measuring device 62 . Therefore, an observer who confirms the current value displayed on the display unit 61 of the measuring instrument 62 can recognize that the current value has changed, and recognize that one of the sensor conductors has broken. be able to. FIG. 5A shows an example in which the sensor portion 33 of the third sensor conductor 31c is broken. When the sensor portions 33 of all the sensor conductors 31a to 31c are broken, the combined resistance value R0 becomes infinite and the current value becomes 0 (zero). It can be recognized that is broken.

In order to confirm whether any one of the three sensor conductors 31a to 31c is broken when the combined resistance value R0 changes, the electrical resistance value R1 of the first resistor 35a and the second The electrical resistance value R2 of the resistor 35b and the electrical resistance value R3 of the third resistor 35c preferably satisfy the following relationship.

In this case, even if one sensor conductor or two of the three sensor conductors 31a to 31c are broken, the combined resistance value R0 of the electric circuit 30 can be made different. Therefore, it is possible to specify which sensor conductor has been broken, and to specify the location of the breakage, that is, the damaged location of the upper cover 8 .

For example, when only the first sensor conductor 31a breaks, the combined resistance value R0 is as follows.

For example, when the second sensor conductor 31b and the third sensor conductor 31c are broken, the combined resistance value R0 is as follows.

When the relationship of formula (2) described above is satisfied, the combined resistance value R0 shown in formula (3) can be made different from the combined resistance value R0 shown in formula (4). Therefore, it is possible to easily detect whether any one of the three sensor conductors 31a to 31c is broken.

Further, in the present embodiment, the first resistor 35a, the second resistor 35b and the third resistor 35c are not embedded in the upper cover 8, but are arranged outside (upper side) of the upper cover 8. ing. In this case, each resistor 35a to 35c may be accommodated in a common box (not shown) or the like.

As described above, according to the present embodiment, the detection unit 41 measures the current value flowing through the electric circuit 30 and displays the measured current value. As a result, changes in the current flowing through the electric circuit 30 can be easily detected. Further, even when the electric circuit 30 has a plurality of sensor conductors 31a to 31c, detecting a change in current causes one of the plurality of sensor conductors 31a to 31c to break. You can easily identify what you are doing.

Moreover, according to the present embodiment, the first circuit 30a, the second circuit 30b, and the third circuit 30c are provided in parallel with each other. As a result, even if one of the three sensor conductors 31a to 31c is broken, a current can flow through the electric circuit 30 in the circuit including the unbroken sensor conductors 31a to 31c. can. Therefore, it is possible to easily identify which one of the three sensor conductors 31a to 31c is broken. Furthermore, the presence or absence of breakage of the three sensor conductors 31a to 31c can be detected by a single detection unit 41, and an increase in the number of cables 32 can be suppressed, and an increase in the number of detection units 41 can be suppressed. Therefore, complication of the configuration of the damage detection device 20 can be suppressed.

Further, according to the present embodiment, the electrical resistance value of the first circuit 30a, the electrical resistance value of the second circuit 30b, and the electrical resistance value of the third circuit 30c are different from each other. This makes it possible to more reliably identify which sensor conductor among the three sensor conductors 31a to 31c is broken. Specifically, according to this embodiment, the first circuit 30a includes a first resistor 35a, the second circuit 30b includes a second resistor 35b, and the third resistor 35c includes a third resistor 35c. contains. This makes it possible to easily adjust the electrical resistance value of the first circuit 30a, the electrical resistance value of the second circuit 30b, and the electrical resistance value of the third circuit 30c. Resistance values can be easily varied.

Further, according to the present embodiment, the first sensor conductor 31a, the second sensor conductor 31b, and the third sensor conductor 31c are arranged at different positions when viewed from the flow path side. As a result, the sensor conductors 31a to 31c can be arranged at a plurality of locations on the upper cover 8 that are different from each other. Therefore, the presence or absence of damage can be detected at a plurality of locations on the upper cover 8 .

Further, according to the present embodiment, the first resistor 35a, the second resistor 35b and the third resistor 35c are arranged outside the upper cover 8. As shown in FIG. This makes it possible to avoid burying the resistors 35a to 35c in the upper cover 8. FIG. Therefore, the work of burying the sensor conductors 31a to 31c in the upper cover 8 can be prevented from becoming complicated.

In the above-described embodiment, the first circuit 30a includes the first resistor 35a, the second circuit 30b includes the second resistor 35b, and the third circuit 30c includes the third resistor 35c. I explained an example. However, the present invention is not limited to this. If the electric resistance values of the circuits 30a to 30c can be distinguished by the electric resistance values of the circuits 30a to 30c, the circuits 30a to 30c can be connected to the resistors 35a to 30c. 35c may not be included.

Further, in the present embodiment described above, the example in which the first circuit 30a, the second circuit 30b, and the third circuit 30c are provided in parallel with each other has been described. However, the present invention is not limited to this, and when one of the plurality of sensor conductors 31a to 31c is broken, the current flowing through the electric circuit 30 changes, making it possible to identify the broken sensor conductor. If possible, the circuit configuration is arbitrary.

In the above-described embodiment, the first sensor conductor 31a, the second sensor conductor 31b, and the third sensor conductor 31c are arranged at different positions when viewed from the flow channel side. bottom. However, the present invention is not limited to this. For example, as shown in FIG. 6, the sensor conductors 31a to 31c are arranged at different positions in the direction away from the flow path (thickness direction of the upper cover 8, vertical direction). may have been In this case, it is possible not only to detect the presence or absence of damage, but also to detect the degree of progression of the damage (that is, damage depth). FIG. 6 shows an example in which the sensor portion 33 of the first sensor conductor 31a is broken.

Moreover, in the present embodiment described above, the example in which the first resistor 35a, the second resistor 35b, and the third resistor 35c are arranged outside the upper cover 8 has been described. However, the present invention is not limited to this, and the resistors 35a to 35c may be embedded in the upper cover 8, as shown in FIG. 7, for example. In the example shown in FIG. 7, the sensor conductors 31a to 31c are arranged at different positions in the direction away from the channel (thickness direction of the upper cover 8, vertical direction). In FIG. 7, the measuring instrument 62 is connected to the sensor conductors 31a-31c of each circuit 30a-30c via the cable 32 and the sensor connection . The resistors 35a to 35c may be embedded in the upper cover 8 in the form shown in FIG. 5A.

Further, in the present embodiment described above, an example in which the electric circuit 30 has three circuits (the first circuit 30a, the second circuit 30b, and the third circuit 30c) has been described. However, the present invention is not limited to this, and the number of circuits constituting the electric circuit 30 is arbitrary.

Further, in the present embodiment described above, an example in which sensor conductors 31a to 31c are embedded in upper cover 8 by being inserted into holes formed in upper cover 8 has been described. However, the present invention is not limited to this, and each sensor conductor 31a-31c may be embedded in the upper cover 8 using a module member 51 as shown in FIG. The module member 51 shown in FIG. 8 has a plurality of sensor conductors 31a to 31c and a plurality of resistors 35a to 35c embedded in the module member 51, but is otherwise the same as the module member 51 shown in FIG. Therefore, detailed description is omitted here. In addition, in the example shown in FIG. 8 , a plurality of module members 51 are embedded in the upper cover 8 . That is, the damage detection device 20 in the example shown in FIG. 8 corresponds to an example in which a plurality of electric circuits 30 shown in FIG. 7 are provided independently. As a result, when viewed from the side of the flow path, it is possible to detect the extent of progress of damage at a plurality of different locations. In this case, the number and spacing of the sensor conductors 31 in each electric circuit 30 may be appropriately set according to the degree of damage and the depth of damage to be detected.

In the example shown in FIG. 8, the material of the module member 51 may be made of a material having the same mechanical properties as the material of the top cover 8 . Alternatively, the material of the module member 51 may be formed of a resin material. As the resin material, epoxy resin, silicone resin, or the like, which is used in integrated circuits, may be used. Alternatively, the module member 51 may be formed into an elongated rod shape by using resistive elements used in integrated circuits or the like as the resistors 35a to 35c. In this case, the module member 51 can be made smaller, and the installation hole 50 formed in the upper cover 8 can be made smaller. Note that the module member 51 using such a resin material can be similarly applied to the module member 51 shown in FIG. 3 described above.

Although the example shown in FIG. 8 shows an example in which the sensor conductors 31a to 31c and the resistors 35a to 35c constituting the electric circuit 30 are embedded in one module member 51, the present invention is not limited to this. no. For example, each of the sensor conductors 31a-31c may be embedded in different module members. That is, a first sensor conductor 31a and a first resistor 35a are embedded in a first module member, a second sensor conductor 31b and a second resistor 35b are embedded in a second module member, and a third sensor conductor 31c and third resistor 35c may be embedded in the third module member.

(Third Embodiment)
Next, a damage detection device for fluid machinery and a fluid machinery according to a third embodiment will be described with reference to FIG.

The third embodiment shown in FIG. 9 is mainly different in that the sensor conductor of the electric circuit is provided on the defining surface defining the flow path of the flow path defining member. It is substantially the same as the first embodiment shown in FIGS. In FIG. 9, the same parts as in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, as shown in FIG. 9, the sensor conductor 31 of the electric circuit 30 is provided on the defining surface 8a of the upper cover 8 defining the flow path. For example, the sensor conductors 31 may be configured with a printed circuit board 70 . In this case, the printed circuit board 70 may be formed to have flexibility so that it can be easily deformed along the shape of the defining surface of the flow path defining member to be installed. A sensor conductor 31 including a sensor section 33 is formed on the printed circuit board 70 so as to be covered with a resin layer. The thickness and material of the resin layer may be formed using any material with any thickness as long as it can have flexibility. However, by reducing the thickness of the printed circuit board 70, it is possible to reduce the unevenness formed on the defining surface 8a of the upper cover 8, thereby suppressing loss in water flow. Alternatively, a concave portion may be formed in the defining surface 8a, and the printed circuit board 70 may be accommodated and attached to the concave portion. In this case, the unevenness formed on the defining surface 8a can be further reduced, and the occurrence of loss in the flow of water can be further suppressed.

The electrical circuit 30 in this embodiment may be configured to include one sensor conductor 31 as shown in FIG. Alternatively, as shown in FIGS. 4-7, it may be configured to include a plurality of sensor conductors 31a-31c.

The printed circuit board 70 may be attached to the defining surface 8a of the upper cover 8 by any means as long as it can be prevented from being separated from the defining surface 8a of the upper cover 8 during operation of the Francis turbine 1 . For example, the printed circuit board 70 may be attached to the defining surface 8a of the upper cover 8 using an adhesive having a desired adhesive strength. The cable 32 of the electric circuit 30 may be electrically connected to the sensor conductor 31 of the printed circuit board 70 attached to the defining surface 8a through a hole formed in the upper cover 8. FIG.

In this embodiment shown in FIG. 9, when the upper cover 8 is damaged, the defining surface 8a of the upper cover 8 is scraped off and the printed circuit board 70 is also damaged. As a result, the sensor portion 33 formed on the printed circuit board 70 is broken at that portion, and a broken portion B is formed. The breakage portion B cuts the sensor conductor 31, and the electric circuit 30 is brought into a non-conducting state in which no current flows.

As described above, according to the present embodiment, the electric circuit 30 is attached to the defining surface 8a of the upper cover 8 defining the flow path. This makes it possible to easily attach the electric circuit 30 to the upper cover 8 . Therefore, the installation work of the damage detection device 20 can be simplified.

(Fourth embodiment)
Next, a damage detection device for fluid machinery and a fluid machinery according to a fourth embodiment will be described with reference to FIG.

The fourth embodiment shown in FIG. 10 is mainly different in that it further includes a detection information collection unit that collects detection information indicating that a change in current has been detected by the detection unit. It is substantially the same as the first embodiment shown in FIGS. 10, the same parts as in the first embodiment shown in FIGS. 1 to 4 are assigned the same reference numerals, and detailed description thereof is omitted.

In the present embodiment, as shown in FIG. 10, the detected information collecting unit 80 collects detection information indicating that the detecting unit 41 has detected a change in current in the electric circuit 30 . That is, the damage detection device 20 according to the present embodiment further includes a detection information collection unit 80 that collects detection information indicating that the detection unit 41 has detected a change in current. The detection information collection unit 80 according to the present embodiment has a recording unit 81 that records detection information indicating that the detection unit 41 has detected a change in current.

In this embodiment, the sensor conductor 31 of the electric circuit 30 is provided on the runner 5 of the Francis turbine 1 . More specifically, a plurality of module members 51 in which sensor conductors 31 are embedded as shown in FIG. 3 or FIG. One module member 51 is provided on each of the crown 5a and the band 5b of the runner 5, and a plurality of module members 51 are provided on the runner blades 5c. These module members 51 may form independent electric circuits 30, as shown in FIG. In this case, each electric circuit 30 may be provided with the detection section 41 and the detection information collection section 80 described above. However, the detection information collection unit 80 may not be provided for each electric circuit 30. For example, one detection information collection unit 80 may collect detection information from the detection unit 41 of each electric circuit 30. good too. Note that the location and the number of module members 51 to be installed are arbitrary.

The presence or absence of current flowing through the electric circuit 30 is detected by the detection unit 41 (see FIG. 1). For example, a relay (electromagnetic relay) as the detector 41 may be provided in the electric circuit 30 . The relay may be connected in series with the sensor conductor 31 in the electric circuit 30 so that the output contact is switched depending on the presence or absence of current in the electric circuit 30 . For example, when current is flowing through the electric circuit 30, the output contact is turned OFF. As a result, it is possible to detect that a current is flowing through the electric circuit 30 and to recognize that the sensor portion 33 of the sensor conductor 31 is not broken. On the other hand, when no current is flowing through the electric circuit 30, the output contact is turned ON. As a result, it is detected that no current is flowing through the electric circuit 30, and it can be recognized that the sensor portion 33 of the sensor conductor 31 is broken. Therefore, it is possible to easily detect that the sensor portion 33 of the sensor conductor 31 is broken.

A change in the ON and OFF state of the output contact of this relay is recorded by the recording unit 81 as detection information representing a change in the current flowing through the electric circuit 30 . In this way, detection information is recovered that a change in current has been detected. This detection information is recorded in the storage medium inserted in the recording unit 81 . For example, when the output contact of the relay is switched from OFF to ON, that fact may be recorded together with the time. Any storage medium may be used as long as it is configured to be readable by a computer or the like, and any medium such as a memory card, a compact disc (CD), or the like can be used.

The storage medium is removed from the recording unit 81 when the Francis turbine 1 is stopped, for example, during a periodic inspection. Then, the detection information recorded in the storage medium is read by a computer or the like, and the detection information can be confirmed. By confirming the detection information, the observer can recognize whether the sensor portion 33 of any one of the plurality of sensor conductors 31 is broken.

The electric circuit 30, the power supply unit 40 (see FIG. 1), the detection unit 41 (see FIG. 1), and the detection information recovery unit 80, which constitute the damage detection device 20, are attached to the runner 5 and are rotatable together with the runner 5. It has become. As a result, the electric circuit 30, the power supply unit 40, the detection unit 41, and the detection information collection unit 80 can be rotated integrally with the runner 5, which is a rotating body. In this case, the damage detection device 20 does not need to be attached separately to the rotating body and the stationary body (upper cover 8, etc.) of the Francis turbine 1, and the structure of the damage detection device 20 can be simplified. The power supply unit 40, the detection unit 41, and the detection information collection unit 80 may be configured integrally.

As described above, according to the present embodiment, the detection information indicating that the detection unit 41 has detected a change in the current flowing through the electric circuit 30 is recorded in the recording unit 81 of the detection information collection unit 80 . This makes it possible to collect the detection information and eliminate the need for constant monitoring. Therefore, the monitoring load can be reduced. In addition, the time at which the change in current is detected can be recorded, and can be collated with the record of the operating state of the Francis turbine 1 .

Further, according to the present embodiment, the electrical circuit 30 , the power supply section 40 , the detection section 41 and the detection information collection section 80 of the damage detection device 20 are provided in the runner 5 . As a result, damage to the runner 5, which is a rotating body, can be directly detected. Therefore, it is possible to accurately detect damage to the runner 5, which is susceptible to damage due to cavitation or the like. In addition, it is possible to eliminate the need to separately attach the damage detection device 20 to the rotating body and the stationary body of the Francis turbine 1, thereby simplifying the configuration.

In the present embodiment described above, an example has been described in which the module member 51 in which the sensor conductor 31 of the electric circuit 30 is embedded is provided in the runner 5 of the Francis turbine 1 . However, it is not limited to this, and the module member 51 may be provided in a channel defining member other than the runner 5 such as the upper cover 8 . The number of module members 51 provided in the flow path defining member is arbitrary, and the number of electric circuits 30 is also arbitrary. In this case, the power supply unit 40, the detection unit 41, and the detection information collection unit 80 may be provided in the flow path defining member provided with the module member 51, but the installation positions are arbitrary.

Further, in the present embodiment described above, an example in which the detection information collection unit 80 has the recording unit 81 that records the detection information indicating that the detection unit 41 has detected a change in current has been described. However, it is not limited to this, and the detection information collection unit 80 may have a detection information transmission unit 82 that transmits detection information wirelessly or by wire. In this case, a receiving unit for receiving the detection information transmitted from the detection information transmission unit 82 is provided at a position away from the Francis turbine 1 (for example, the control room of the power plant where the Francis turbine 1 is installed), and the detection You can check the information. In addition, the detection information transmission unit 82 collects the detection information indicating that the change in current has been detected, and transmits it from the detection information transmission unit 82 to the control device (not shown) of the power plant, whereby the Francis turbine 1 The amount of water flowing into the runner 5 may be adjusted so that the operating point becomes an operating point at which cavitation is less likely to occur. When the detection information is transmitted wirelessly, the detection information transmission unit 82 may be composed of a radio transmitter such as a telemeter. In this case, the detection information is transmitted by a wireless receiver on the control device side. You may make it receive. Further, when transmitting the detection information by wire, the detection information transmission unit 82 is configured by, for example, a slip ring and a brush, and electrically connects the output contact of the relay configured as the detection unit 41 to the control device. You may do so.

Further, in the present embodiment described above, an example in which the detection unit 41 has a relay has been described. However, the detection section 41 is not limited to this, and the detection section 41 may have a measurement section 60 (see FIG. 5A etc.) that measures the value of the current flowing through the electric circuit 30 . The data of the current value measured by the measuring unit 60 will include information about changes in the current. Therefore, the measurement unit 60 can detect changes in the current flowing through the electric circuit 30 . Then, the current value measured by the measuring unit 60 is recorded in the storage medium by the recording unit 81 . As a result, when the measured current value changes, detection information indicating that the measurement unit 60 has detected a change in current is collected in the recording unit 81 . Further, when the detection unit 41 has the measurement unit 60, the electric circuit 30 may be a circuit as shown in FIGS. 1 to 4, or a parallel circuit as shown in FIGS. 5A to 8. good too.

Further, an example in which the sensor conductor 31 of the electric circuit 30 in the present embodiment described above is embedded in the module member 51 has been described. However, the present invention is not limited to this, and the sensor conductor 31 may be composed of a printed circuit board 70 as shown in FIG.

According to the embodiments described above, it is possible to improve the accuracy of detecting damage to the flow path defining member that defines the flow path through which the working fluid flows.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof. Moreover, it is of course possible to partially combine these embodiments appropriately within the scope of the present invention.

In each of the above-described embodiments, the Francis turbine 1 has been described as an example of fluid machinery. However, it is not limited to this, and examples of the fluid machinery include water turbines other than the Francis turbine 1 (for example, propeller water turbines such as Kaplan water turbines). Furthermore, each embodiment described above can be similarly applied to a fluid device other than a water turbine, such as a pump.

1: Francis turbine, 5: runner, 8: upper cover, 8a: defining surface, 20: damage detection device, 30: electric circuit, 30a: first circuit, 30b: second circuit, 31: sensor conductor, 31a: second 1 sensor conductor, 31b: second sensor conductor, 35a: first resistor, 35b: second resistor, 40: power supply unit, 41: detection unit, 42: lamp, 44: notification unit, 50: installation hole, 51 : module member, 70: printed circuit board, 80: detection information recovery unit, I: current, F: flow path,

Claims (17)

A damage detection device for a fluid machine that detects damage to a flow path defining member that defines a flow path through which a working fluid flows,
an electric circuit including a sensor conductor provided in the flow path defining member;
a power supply unit that supplies current to the electric circuit;
a detection unit that detects changes in the current flowing through the electric circuit,
the electrical circuit is configured as a closed circuit ,
The damage detection device for a fluid machine, wherein the detection unit has a determination unit that measures a current value flowing through the electric circuit and determines a damaged portion of the flow path defining member based on the measured current value. . 2. The damage detection device for a fluid machine according to claim 1, wherein said detection unit has a lamp that is switched between lighting and extinguishing in accordance with the presence or absence of current flowing through said electric circuit. 2. The damage detection device for fluid machinery according to claim 1, wherein said detection unit has a notification unit for notifying the presence or absence of current flowing through said electric circuit. 2. The damage detection device for fluid machinery according to claim 1, wherein said detector measures a value of current flowing through said electric circuit and displays said measured value of current. a plurality of said electrical circuits;
a plurality of the detection units that detect changes in the current flowing through the corresponding electric circuits,
5. The damage detection device for fluid machinery according to claim 1, wherein said sensor conductors of said electric circuit are arranged at different positions when viewed from said flow path side. The electric circuit has a first circuit and a second circuit provided in parallel with the first circuit,
The sensor conductor has a first sensor conductor provided in the first circuit and a second sensor conductor provided in the second circuit,
5. The damage detection device for fluid machinery according to claim 1 , wherein the electrical resistance value of said first circuit and the electrical resistance value of said second circuit are different from each other. 7. The damage detection device for fluid machinery according to claim 6 , wherein said first sensor conductor and said second sensor conductor are arranged at different positions when viewed from said flow path side. 7. The damage detection device for a fluid machine according to claim 6 , wherein said first sensor conductor and said second sensor conductor are arranged at positions different from each other in a direction away from said flow path. the first circuit includes a first resistor connected in series with the first sensor conductor;
9. The fluid machinery damage detection device according to claim 6 , wherein said second circuit includes a second resistor connected in series with said second sensor conductor. 10. The damage detection device for fluid machinery according to claim 9 , wherein said first resistor and said second resistor are arranged outside said flow path defining member. 10. The damage detection device for fluid machinery according to claim 9 , wherein said first resistor and said second resistor are embedded in said flow path defining member. The damage detection device for fluid machinery according to any one of claims 1 to 11 , wherein the sensor conductor is embedded in the flow path defining member. an installation hole provided in the flow path defining member;
The damage detection device for fluid machinery according to any one of claims 1 to 10 , further comprising a module member in which said sensor conductor is embedded and which is installed in said installation hole. A damage detection device for a fluid machine that detects damage to a flow path defining member that defines a flow path through which a working fluid flows,
an electric circuit including a sensor conductor provided in the flow path defining member;
a power supply unit that supplies current to the electric circuit;
a detection unit that detects changes in the current flowing through the electric circuit,
the electrical circuit is configured as a closed circuit ,
A damage detection device for a fluid machine, wherein the sensor conductor of the electric circuit is provided on a defining surface defining the flow path of the flow path defining member . A damage detection device for a fluid machine that detects damage to a flow path defining member that defines a flow path through which a working fluid flows,
an electric circuit including a sensor conductor provided in the flow path defining member;
a power supply unit that supplies current to the electric circuit;
a detection unit that detects changes in the current flowing through the electric circuit,
the electrical circuit is configured as a closed circuit ,
A damage detection device for a fluid machine, further comprising a detection information collection unit that collects detection information indicating that a change in current has been detected by the detection unit. 16. The damage detection device for a fluid machine according to claim 15 , which is provided on a rotating body of said fluid machine. a channel defining member that defines a channel through which the working fluid flows;
A fluid machine comprising the damage detection device for a fluid machine according to any one of claims 1 to 16 .

Images