JP2020149256A - Abnormality detection device, abnormality detection method, and program - Google Patents

Abstract

To provide an abnormality detection device, an abnormality detection method, and a program for easily specifying an abnormality location.SOLUTION: An abnormality detection device comprises a blower 22, a plurality of electronic apparatuses 20, and a control unit having a derivation unit and a specification unit. The blower 22 sends air W into a housing 15. The plurality of electronic apparatuses 20 are arranged in the housing 15 and aligned in parallel in a second direction Y crossing a first direction X in which the air W flows. The derivation unit derives a pressure difference between a first pressure on the upstream side in the first direction X from the plurality of electronic apparatuses 20 and a second pressure on the downstream side in the first direction X from the plurality of electronic apparatuses 20 in the housing 15. The specification unit specifies an abnormality location in the housing 15 based on the pressure difference and an estimated static pressure that is an estimated value of a static pressure in the housing 15.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to anomaly detection devices, anomaly detection methods, and programs.

A device for cooling an electronic device by sending wind to a plurality of electronic devices arranged in a housing of the device is known. Further, a technique is disclosed in which a plurality of sensors are provided in each of a plurality of electronic devices for detecting a cooling abnormality portion, and an electronic device equipped with a sensor that detects an abnormal value is determined to be abnormal.

However, conventionally, when an abnormality occurs in a place where a sensor is not provided, it is not possible to identify that the place is an abnormal place, and the place is in each of a large number of places where an abnormality is expected to occur. It was necessary to install multiple types of sensors to detect abnormalities that could occur in. Therefore, in the past, it was difficult to easily identify the abnormal portion.

Japanese Unexamined Patent Publication No. 2008-34715

The present invention has been made in view of the above, and an object of the present invention is to provide an abnormality detection device, an abnormality detection method, and a program capable of easily identifying an abnormality location.

The abnormality detection device of the embodiment includes a blower that blows air into the housing, and a plurality of blowers arranged in parallel in a second direction that is arranged in the housing and intersects with a first direction in which the wind flows. The electronic device, the first pressure on the upstream side of the plurality of electronic devices in the first direction, and the second pressure on the downstream side of the plurality of electronic devices in the first direction. A derivation unit for deriving the pressure difference of, and a specific unit for identifying an abnormal portion in the housing based on the pressure difference and the estimated static pressure which is an estimated value of the static pressure in the housing. Be prepared.

Schematic diagram of the anomaly detection system. Functional block diagram of the abnormality detection device. A diagram showing the relationship between air volume and static pressure. A diagram showing the relationship between air volume and static pressure. Experimental results of anomaly. Specific result of abnormal part. The schematic diagram which shows the flow of anomaly detection processing. Schematic diagram of the configuration of the abnormality detection device. Schematic diagram of the housing in which the blower is arranged outside. Block diagram of a hardware configuration example.

The details of the present embodiment will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an example of an abnormality detection system 1.

The abnormality detection system 1 includes an abnormality detection device 10 and an external device 50. The abnormality detection device 10 and the external device 50 are connected to each other so as to be communicable by wire or wirelessly via the network N.

The abnormality detection device 10 is a device that detects an abnormality. The abnormality detection device 10 is applied to various devices such as a digital broadcasting transmitter and a data relay device.

The abnormality detection device 10 includes a control unit 12, a housing 15, a plurality of electronic devices 20, a blower 22, and a sensor 14.

The housing 15 is the main body portion of the abnormality detection device 10, and is an exterior that houses various parts and devices inside. In the present embodiment, the case where the housing 15 is a box-shaped member having a hollow inside and long in a predetermined direction will be described as an example.

The blower 22 is arranged on one end side in the longitudinal direction of the housing 15. In the present embodiment, the blower 22 is arranged at a position where the wind W can be sent into the housing 15 from the opening provided at one end in the longitudinal direction of the housing 15. That is, in the present embodiment, the blower 22 sends the wind W into the housing 15 by sending the air outside the housing 15 into the housing 15.

The blower 22 may be referred to as, for example, a fan or a blower.

The blower 22 may be arranged at a position where the air inside the housing 15 can be discharged to the outside of the housing 15. Further, even if the blower 22 is arranged at both a position where the wind W can be sent into the housing 15 and a position where the air inside the housing 15 can be discharged to the outside of the housing 15. Good.

The electronic device 20 is a device driven by the supplied electric power. The electronic device 20 includes one or more components. A component is at least one of an electronic component and a member having various functions.

Electronic components are components that are driven according to the supplied electric power. The electronic component includes a heat generating component 24 that generates heat by being driven according to the supplied electric power. The "drive" includes both an electric drive and a mechanical drive. The electrical drive includes, for example, processing by a processor such as a CPU (Central Processing Unit). Mechanical drive includes, for example, drive of a motor.

The heat generating component 24 is, for example, a processor such as a CPU or a GPU (Graphics Processing Unit). The heat-generating component 24 may be any component that generates heat that is driven according to the supplied electric power, and is not limited to the CPU and GPU. For example, the heat generating component 24 may be a motor, an electronic circuit, a switching element such as a FET (Field Effect Transistor), or the like.

The member having various functions is, for example, a member having a cooling function. The member having a cooling function is, for example, a member made of a metal material having high thermal conductivity. Specifically, the member having a cooling function is a heat sink, a heat radiating component, or the like.

In the present embodiment, the case where the electronic device 20 includes at least one or a plurality of heat generating components 24 will be described as an example. The electronic device 20 may be further provided with other parts. Further, the electronic device 20 may be configured not to include the heat generating component 24.

In the present embodiment, the abnormality detection device 10 includes a plurality of electronic devices 20. The plurality of electronic devices 20 are arranged in the housing 15. The plurality of electronic devices 20 are arranged in parallel in the housing 15 along a second direction Y that intersects the first direction X.

The first direction X is a direction in which the wind W flows into each of the plurality of electronic devices 20 in the housing 15. The direction in which the wind W flows into the electronic device 20 is the direction in which the wind W flows from the outside of the electronic device 20 to the inside of the electronic device 20, and the wind W flows between the adjacent electronic devices 20 arranged in parallel. Indicates the direction of inflow. The second direction Y is a direction that intersects the first direction X. The second direction Y preferably indicates a direction orthogonal to the first direction X, but is not limited to orthogonality.

In FIG. 1, as an example, five electronic devices 20 (electronic devices 20A to 20E) are arranged in the housing 15, and these electronic devices 20 are arranged in parallel in the second direction Y. This form is shown as an example. However, the number of electronic devices 20 arranged in the housing 15 may be plural, and is not limited to five.

In the present embodiment, the sensor 14 is provided in the housing 15. Specifically, the abnormality detection device 10 includes at least a pressure sensor 14A, a temperature sensor 14B, and a sensor 14C as the sensor 14. In addition, another kind of sensor 14 may be further provided in the housing 15.

The pressure sensor 14A is a sensor that measures the pressure inside the housing 15. For the pressure sensor 14A, a known device capable of detecting the pressure may be used. In the present embodiment, two pressure sensors 14A (first pressure sensor 14A1 and second pressure sensor 14A2) are arranged in the housing 15. These two pressure sensors 14A differ from each other in position in the first direction X.

In the present embodiment, the first pressure sensor 14A1 is located upstream of the plurality of electronic devices 20 in the first direction X and downstream of the blower 22 in the first direction X in the housing 15. Have been placed.

Further, the second pressure sensor 14A2 is arranged in the housing 15 on the downstream side in the first direction X from the plurality of electronic devices 20.

The temperature sensor 14B is a sensor 14 that measures the temperature of the heat generating component 24. For the temperature sensor 14B, a known device capable of measuring the temperature may be used. In the present embodiment, the temperature sensor 14B is arranged for each of the heat generating parts 24 provided in the electronic device 20. Specifically, at least one sensor 14 is arranged for each of one or a plurality of heat generating components 24 provided in the electronic device 20.

In the present embodiment, at least one temperature sensor 14B is arranged for at least one heat generating component 24 among the plurality of heat generating components 24 arranged in the same (one) electronic device 20. Just do it. Therefore, two or more temperature sensors 14B may be arranged for one heat generating component 24. Further, the temperature sensor 14B may be provided at a point other than the heat generating component 24, for example, on a substrate provided with the heat generating component 24.

The sensor 14C is a sensor 14 that measures the rotation speed of the blower 22. The sensor 14C may be a sensor 14 that measures parameters that can be used to derive the rotation speed of the blower 22. For example, the sensor 14C may be a sensor that measures parameters such as the amount of power (current value, voltage value) supplied to the blower 22.

These sensors 14 (pressure sensor 14A, temperature sensor 14B, sensor 14C) and the control unit 12 are connected so as to exchange data or signals. The control unit 12 may be further connected to various electronic devices other than the sensor 14 mounted on the abnormality detection device 10 so that data or signals can be exchanged. The various electronic devices may include the electronic device 20.

Next, the control unit 12 will be described. The control unit 12 identifies an abnormal portion in the abnormality detecting device 10. In the present embodiment, the control unit 12 identifies an abnormal portion in the housing 15 of the abnormality detecting device 10.

FIG. 2 is an example of a functional block diagram of the abnormality detection device 10.

The abnormality detection device 10 includes a control unit 12, a sensor 14, an output unit 26, and a storage unit 28. The control unit 12, the sensor 14, the output unit 26, and the storage unit 28 are connected so as to exchange data or signals. As described above, the control unit 12 may be provided in the abnormality detection device 10 and further connected to various electronic devices and components other than the above so that data or signals can be exchanged.

The storage unit 28 stores various types of data. The storage unit 28 is, for example, a storage medium such as an HDD (hard disk drive).

The output unit 26 outputs various information. In the present embodiment, the output unit 26 outputs specific result information. Details of the specific result information will be described later.

The output unit 26 includes at least one of a display function for displaying various information, a sound output function for outputting sound, and a communication function for communicating data with the external device 50. For example, the output unit 26 is configured by combining at least one of a known display device, a known speaker, and a known communication device.

Next, the control unit 12 will be described.

The control unit 12 includes an acquisition unit 12A, a derivation unit 12B, a specific unit 12C, a second calculation unit 12E, and an output control unit 12D.

The acquisition unit 12A, the derivation unit 12B, the specific unit 12C, and the output control unit 12D are realized by, for example, one or more processors. For example, each of the above parts may be realized by causing a processor such as a CPU (Central Processing Unit) to execute a program, that is, by software. Each of the above parts may be realized by a processor such as a dedicated IC (Integrated Circuit), that is, hardware. Each of the above parts may be realized by using software and hardware in combination. When a plurality of processors are used, each processor may realize one of each part, or may realize two or more of each part.

The acquisition unit 12A acquires the measured value of the sensor 14. In the present embodiment, the acquisition unit 12A acquires the measured value of the pressure by the pressure sensor 14A.

Specifically, the acquisition unit 12A acquires the measured value of the first pressure from the first pressure sensor 14A1. Further, the acquisition unit 12A acquires the measured value of the second pressure from the second pressure sensor 14A2. In the following, the measured value of pressure may be simply referred to as pressure. Therefore, the acquisition unit 12A acquires the first pressure from the first pressure sensor 14A1 and acquires the second pressure from the second pressure sensor 14A2.

Further, in the present embodiment, the acquisition unit 12A acquires the measured value of the temperature from the temperature sensor 14B. For example, the acquisition unit 12A acquires the measured temperature value from each of the temperature sensors 14B1 to 14B6. In the following, the measured value of temperature may be simply referred to as temperature.

Further, the acquisition unit 12A acquires the measured value of the rotation speed of the blower 22 from the sensor 14C. In the following, the measured value of the rotation speed may be described simply as the rotation speed.

As described above, the sensor 14C may be a sensor 14 that measures parameters (current value, voltage value, etc.) that can be used to derive the rotation speed of the blower 22. When the blower 22 is a DC (direct current) fan or the like, it can be said that the rotation speed and the voltage value show a substantially proportional relationship. Therefore, in this case, the acquisition unit 12A may acquire the rotation speed of the blower 22 by calculating the rotation speed of the blower 22 from the parameter received from the sensor 14C using a known function or the like.

The lead-out unit 12B has a first pressure on the upstream side in the first direction X from the plurality of electronic devices 20 and a second pressure on the downstream side in the first direction X from the plurality of electronic devices 20 in the housing 15. The pressure difference ΔP from the pressure is derived. In the present embodiment, this pressure difference ΔP is used as an actually measured value of the static pressure in the housing 15.

Specifically, the lead-out unit 12B derives the absolute value of the pressure difference between the first pressure and the second pressure as the pressure difference ΔP.

As described above, the first pressure sensor 14A1 is arranged in the housing 15 on the upstream side of the plurality of electronic devices 20 in the first direction X and on the downstream side of the blower 22 in the first direction X. Has been done. Further, the second pressure sensor 14A2 is arranged in the housing 15 on the downstream side in the first direction X from the plurality of electronic devices 20.

Therefore, in the present embodiment, the lead-out unit 12B determines the pressure difference ΔP between the first pressure acquired from the first pressure sensor 14A1 and the second pressure acquired from the second pressure sensor 14A2. Derived.

The identification unit 12C identifies an abnormal portion in the housing 15 based on the pressure difference ΔP and the estimated static pressure ΔP'.

The estimated static pressure ΔP'is an estimated value of the static pressure in the housing 15.

First, the specific unit 12C derives an estimated static pressure ΔP'which is an estimated value of the static pressure of the housing 15. In the present embodiment, the specific unit 12C derives the estimated static pressure ΔP'based on the rotation speed of the blower 22 acquired by the acquisition unit 12A.

For example, the specific unit 12C derives the estimated static pressure ΔP'by the following method.

First, the similarity formula of a fan such as a blower 22 is represented by the following formula (A).

ΔP / ΔP ₀ = (L / L ₀ ) ² · (n / n ₀ ) ² equation (A)

In the formula (A), ΔP represents the pressure difference ΔP. ΔP ₀ indicates the static pressure in the housing 15 in the normal state. L indicates the blade diameter of the blower 22. L ₀ indicates the blade diameter of the blower 22 in the normal state.

The normal state means a state in which no abnormality has occurred in the abnormality detection device 10 (specifically, in the housing 15).

It is assumed that the blade diameter of the blower 22 is a constant value regardless of whether it is in a normal state or an abnormal state that is not a normal state. That is, it is assumed that “L = L ₀ ”.

Then, the following equation (B) is derived from the above equation (A) as a relational expression that holds in the normal state.

ΔP'= ΔP ₀ (N / N ₀ ) Equation ² (B)

Immediately after the abnormality detection device 10 is manufactured, when the abnormality detection device 10 is designed, or immediately after the abnormality detection device 10 is delivered to the installation site, it is assumed that the abnormality detection device 10 is in a normal state. Therefore, in advance, by measuring the [Delta] P ₀ and n ₀ at any of these timing, before operation of the abnormality detecting apparatus 10, it is possible to obtain the value of ΔP _{0 /} N 0 ^2. That is, the abnormality detecting apparatus at the time of 10 operating, the value of ΔP _{0 /} N 0 ² in the formula (B), it is possible to treat a pre-measured constant.

Therefore, in the present embodiment, the control unit 12, from the measurement result of each of ΔP0 and n ₀ in the normal state of the abnormality detecting apparatus 10, previously calculated value of ΔP _{0 /} N 0 ^2, stored in the storage unit 28 To do.

Then, the specifying unit 12C includes a ΔP _{0 /} N 0 ² value is a constant that is stored in the storage unit 28, and the rotational speed n obtained by the obtaining unit 12A, a by substituting the above formula (B) , Estimated static pressure ΔP'is calculated.

Then, the specifying unit 12C identifies an abnormal portion in the housing 15 based on the magnitude relationship between the pressure difference ΔP and the estimated static pressure ΔP'.

For example, assume that the estimated static pressure ΔP'is larger than the pressure range including the pressure difference ΔP. In this case, the specific unit 12C determines that the relationship of "estimated static pressure ΔP'> pressure difference ΔP ± α" is satisfied. In this case, the identification unit 12C identifies a second region outside the first region between the first pressure measurement point and the second pressure measurement point in the housing 15 as an abnormal portion. To do.

The pressure range including the pressure difference ΔP is a pressure range in the range of ± α including the derived pressure difference ΔP. The value of α may be appropriately adjusted according to the abnormality detection device 10 for abnormality detection. The value of α may be a value close to “0 (zero)” or may be “0 (zero)”. In the present embodiment, it is assumed that the value of α is a value close to “0 (zero)” and not “0 (zero)”.

Therefore, when the estimated static pressure ΔP'is larger than the pressure range of the pressure difference ΔP ± α, the specifying unit 12C identifies the second region as an abnormal portion.

The first region is a region in the housing 15 between the first pressure measurement point and the second pressure measurement point.

As shown in FIG. 1, in the present embodiment, the installation position of the first pressure sensor 14A1 that measures the first pressure in the housing 15 is used as the first pressure measurement point P1. Further, in the present embodiment, the installation position of the second pressure sensor 14A2 that measures the second pressure in the housing 15 is used as the second pressure measurement point P2.

In this case, the first region E1 passes through the point PB, which is a cutting surface in the housing 15 along the second direction Y passing through the first pressure measuring point P1, and the second pressure measuring point P2. It is an area between the point PC, which is a cut surface along the second direction Y.

The second region E2 is a region inside the housing 15 outside the first region E1 (a region between the point PB and the point PC). Specifically, the second region E2 is along the point PA, which is the upstream end face of the first direction X, and the second direction Y passing through the first pressure measurement point P1 in the housing 15. This is the area between the point PB, which is the cut surface. Further, the second region E2 is a point PC which is a cut surface in the housing 15 along the second direction Y passing through the second pressure measurement point P2, and the first direction X in the housing 15. It is the area between the end face on the downstream side of.

That is, when the estimated static pressure ΔP'is larger than the pressure range of the pressure difference ΔP ± α, the specific portion 12C is outside the first region E1 which is the region where the plurality of electronic devices 20 are arranged in the housing 15. The second region E2 of the above is specified as an abnormal location.

When the second region E2 is specified as an abnormal portion, it indicates a case where some abnormality occurs in the second region E2 in the housing 15. For example, the abnormality of the second region E2 includes, but is not limited to, an abnormality of the blower 22 and an abnormality of a filter provided outside the blower 22 such as clogging.

FIG. 3 is an example of a diagram showing the relationship between the air volume of the blower 22 and the static pressure in the housing 15 when an abnormality occurs in the second region E2 in the housing 15. The diagram showing the relationship between the air volume and the static pressure may be referred to as a PQ diagram.

In FIG. 3, the horizontal axis indicates the air volume of the blower 22. The vertical axis shows the static pressure inside the housing 15. As described above, in the present embodiment, the pressure difference ΔP between the first pressure and the second pressure is used as the measured value of the static pressure in the housing 15. Therefore, the vertical axis of FIG. 3 corresponds to the pressure difference ΔP.

In FIG. 3, FIG. 30 is a diagram showing the characteristics of the relationship between the static pressure (pressure difference ΔP) and the air volume of the wind W. The static pressure-air volume curve represented by the diagram 30 shows the characteristics of the blower 22. Therefore, the diagram 30 also differs depending on the blower 22.

Further, in FIG. 3, FIG. 31 is a diagram showing the ventilation characteristics of the region between the point PA and the point PD, which is the entire region in the housing 15. The ventilation characteristic curve represented by the diagram 31 shows the characteristics of the device such as the housing 15. Therefore, the diagram 31 differs depending on the housing 15. The diagram 31 is represented by the diagram 31A and the diagram 31B. FIG. 31B is a diagram showing the ventilation characteristics of the region between the point PA and the point PD when the inside of the housing 15 is in the normal state. FIG. 31A shows the point PA and the point PD when an abnormality occurs in the second area E2 outside the first area E1 (the area between the point PB and the point PC) in the housing 15. It is a diagram which shows the ventilation characteristic of the region between.

As shown in FIG. 3, FIG. 31 changes from FIG. 31B to FIG. 31A due to a change in ventilation characteristics due to an abnormality such as clogging of the intake port generated in the second region E2 (FIG. 3). Middle, see arrow 33 direction). Due to such a change in ventilation characteristics, the operating point S of the blower 22 changes from the operating point S1 which is the intersection of the diagram 30 and the diagram 31B to the operating point S2 which is the intersection of the diagram 30 and the diagram 31A. (See arrow 33 in FIG. 3). Therefore, the air volume of the blower 22 decreases (see arrow 35 in FIG. 3), and the static pressure inside the housing 15 (that is, the pressure difference ΔP) also decreases (see arrow 34 in FIG. 3).

On the other hand, the diagram 32 is a diagram showing the ventilation characteristics between the point PB and the point PC, which is the first region E1. In this diagram 32, even if an abnormality occurs in the second region E2, no change in the ventilation characteristics is observed.

Therefore, the pressure difference ΔP, which is the static pressure in the housing 15, becomes a value lower than the normal state when an abnormality occurs (see arrow 34 in FIG. 3). That is, when an abnormality occurs in the second region E2, the estimated static pressure ΔP'is a value larger than the pressure range of the pressure difference ΔP ± α.

Therefore, when the estimated static pressure ΔP'is larger than the pressure range of the pressure difference ΔP ± α, the identification unit 12C of the present embodiment specifies the second region E2 as an abnormal portion.

Here, conventionally, it has been difficult to identify an abnormality in the second region E2, which is a region in which the electronic device 20 is not provided, in the housing 15. Specifically, conventionally, in order to identify an abnormality in the second region E2 in which the electronic device 20 is not provided, there is a possibility that the abnormality may occur in each of a large number of locations where the abnormality may occur. It was necessary to install multiple types of sensors in order to detect certain abnormalities.

On the other hand, in the present embodiment, the specific unit 12C has the respective pressures (first pressure, second pressure) of the first pressure measurement point P1 and the second pressure measurement point P2, and the rotation speed of the blower 22. By acquiring at least n, it is possible to easily identify the abnormality of the second region E2 in the housing 15.

That is, in the present embodiment, the specifying unit 12C can easily identify the abnormality in the second region E2 in the housing 15 by comparing the magnitude relationship between the pressure difference ΔP and the estimated static pressure ΔP'. Can be done.

Here, the abnormality in the first region E1 often occurs in one of a plurality of electronic devices 20 arranged in parallel along the second direction Y in the first region E1.

Even if an abnormality occurs in one of the plurality of electronic devices 20 in the first region E1, the ventilation characteristics in the first region E1 (that is, between the point PB and the point PC) are greatly affected. Is not considered to be given. This is expressed by the relationship of the parallel law of ventilation resistance shown in the following equation (1).

In the formula (1), R ₃ represents a composite value (that is, a composite resistance) of the ventilation resistance of each of the plurality of electronic devices 20 arranged in the first region E1. “N” in R _3n indicates the number of electronic devices 20. For example, when “n = 1”, R ₃₁ is an electronic device arranged at one end of the second direction Y among a plurality of electronic devices 20 arranged in parallel along the second direction Y. It shows a ventilation resistance of 20.

For example, it is assumed that five electronic devices 20 having a ventilation resistance “1” [Pas ² / m ⁶ ] are arranged in parallel in the first region E1 along the second direction Y.

In this case, the combined resistance of the ventilation resistance of each of the plurality of electronic devices 20 arranged in the first region E1 is represented by the following equation (2).

For example, it is assumed that the ventilation resistance R _{31 of} one of the plurality of electronic devices 20 has increased from “1” to “10”. In this case, the combined resistance of the ventilation resistance of each of the plurality of electronic devices 20 arranged in the first region E1 is represented by the following equation (3).

As shown in the above equations (2) and (3), even if an abnormality occurs in one of the plurality of electronic devices 20 in the first region E1, even if an abnormality occurs in the first region E1 (that is, a point). It can be said that it does not significantly affect the ventilation characteristics (between the PB and the point PC).

Therefore, for example, when an abnormality occurs in both the first region E1 and the second region E2, or when the abnormality in the first region E1 is an abnormality of one electronic device 20. , The identification unit 12C can preferentially identify the abnormality in the second region E2, which has been difficult to determine the abnormality in the past.

On the other hand, it is assumed that the estimated static pressure ΔP'is within the pressure range including the pressure difference ΔP. In this case, the specific unit 12C determines that the relationship of "estimated static pressure ΔP'= pressure difference ΔP ± α" is satisfied. In this case, the specifying unit 12C specifies that there is no abnormal portion in the second region E2, which is at least the outer region of the first region E1 in the housing 15.

Therefore, when the estimated static pressure ΔP'is within the pressure range including the pressure difference ΔP, the specifying unit 12C can easily specify that there is no abnormality in at least the second region E2 in the housing 15. Can be done.

On the other hand, it is assumed that the estimated static pressure ΔP'is less than the pressure range of the pressure difference ΔP ± α. In this case, the specific unit 12C determines that the estimated static pressure ΔP'is less than the pressure range of the pressure difference ΔP ± α. In this case, the identification unit 12C specifies the first region E1 as an abnormal portion.

FIG. 4 is an example of a diagram showing the relationship between the air volume of the blower 22 and the static pressure in the housing 15 when an abnormality occurs in the first region E1 in the housing 15.

In FIG. 4, the horizontal axis indicates the air volume of the blower 22. The vertical axis shows the static pressure inside the housing 15. Similar to FIG. 3, the static pressure on the vertical axis of FIG. 4 corresponds to the pressure difference ΔP.

In FIG. 4, FIG. 40 is a diagram showing the characteristics of the relationship between the static pressure (pressure difference ΔP) and the air volume of the wind W. Further, the diagram 41 is a diagram showing the ventilation characteristics of the region between the point PA and the point PD, which is the entire area in the housing 15.

Diagram 41 is represented by diagram 41A and diagram 41B. FIG. 41B is a diagram showing the ventilation characteristics of the region between the point PA and the point PD when the inside of the housing 15 is in the normal state. FIG. 41A shows the ventilation characteristics of the area between the point PA and the point PD when an abnormality occurs in the first area E1 (the area between the point PB and the point PC) in the housing 15. It is a diagram which shows.

Further, in FIG. 4, FIG. 42 is a diagram showing the ventilation characteristics between the point PB and the point PC, which is the first region E1. The diagram 42 is represented by a diagram 42A and a diagram 42B. FIG. 42B is a diagram showing the ventilation characteristics of the region between the point PB and the point PC when the inside of the housing 15 is in the normal state. FIG. 42A shows the ventilation characteristics of the area between the point PB and the point PC when an abnormality occurs in the first area E1 (the area between the point PB and the point PC) in the housing 15. It is a diagram which shows.

As shown in FIG. 4, when an abnormality occurs in the first region E1, the region between the point PA and the point PD, which is the entire region in the housing 15, and the first region E1 (point PB and the point). (Region between PCs), each ventilation characteristic changes (see arrow 43 direction and arrow 45 direction in FIG. 4). Due to such a change in ventilation characteristics, the operating point S of the blower 22 changes from the operating point S1', which is the intersection of the diagram 40 and the diagram 41B, to the operating point S2, which is the intersection of the diagram 40 and the diagram 41A. Move to'(see arrow 43 in FIG. 4). Therefore, the air volume of the blower 22 decreases (see arrow 46 in FIG. 4), and the static pressure inside the housing 15 (that is, the pressure difference ΔP) increases (see arrow 44 in FIG. 4). This is because, when there is an abnormality in the first region E1, the static pressure in the first region E1 (that is, between the point PB and the point PC) is caused by a decrease in the flow rate of the wind W flowing through the first region E1. It is thought that this is because

Therefore, when an abnormality occurs in the first region E1, the estimated static pressure ΔP'is a value less than the pressure range of the pressure difference ΔP ± α.

Therefore, when the estimated static pressure ΔP'is less than the pressure range of the pressure difference ΔP ± α, the specifying unit 12C of the present embodiment specifies the first region E1 as an abnormal portion.

FIG. 5A is an experimental result showing the degree of abnormality when six types of wind W having different air volumes are sent from the blower 22 into the housing 15. The degree of abnormality is represented by, for example, the following equation (6).

β = (ΔP'/ ΔP) Equation ² (6)

In formula (6), β indicates the degree of abnormality. In the formula (6), ΔP'and ΔP represent the estimated static pressure ΔP'and the pressure difference ΔP as described above.

In FIG. 5A, the vertical axis indicates the degree of abnormality. In FIG. 5A, the horizontal axis is information indicating the number of the experiment.

Further, FIG. 5B is a diagram showing a result of identifying an abnormal portion by the specific unit 12C. In FIG. 5B, under the same conditions as in FIG. 5A, when six types of winds W having different air volumes are sent into the housing 15, the identification unit 12C identifies an abnormal portion by the above method for each type of wind W. It is a specific result.

FIG. 5B shows the first region E1 and the second region E2 in association with the specific result “normal” or “abnormal”. In FIG. 5B, "normal" indicates that the corresponding region (first region E1 or second region E2) is normal. In FIG. 5B, “abnormality” indicates that the corresponding region (first region E1 or second region E2) has been identified as an abnormal portion.

Further, the numerical values "1" to "9" in FIGS. 5A and 5B are information indicating the number of the experiment, respectively. In the "1" to "6" experiments, winds W with different air volumes were sent. Further, in the "1" to "6" th experiments, both the first region E1 and the second region E2 were set to the normal state, and the experiment and the identification of the abnormal portion were performed. Further, in the "7th" experiment, the experiment and the identification of the abnormal part were performed with the same air volume as in the "1st" experiment and in a state where an abnormality was generated in the first region E1. Further, in the "8" to "9" experiments, the experiment and the identification of the abnormal part were performed with the same air volume as in the "1" experiment and in a state where an abnormality was generated in the second region E2. I did.

As shown in FIGS. 5A and 5B, in the "1" to "6" th experiments, the degree of anomaly was about "1".

On the other hand, in the "8" to "9" th experiments in which the second region E2, which is the region outside the first region E1, was in an abnormal state, the degree of abnormality showed a higher value than in the normal state.

Further, in the "7" th experiment in which the first region E1 was put into an abnormal state, the degree of abnormality was a little smaller than the value "1" in the normal state.

Therefore, the specific unit 12C of the present embodiment detects an abnormality in the second region E2, which is a region outside the first region E1 in particular, in the housing 15 with high accuracy, and second. It can be said that the region E2 can be specified as an abnormal location.

The explanation will be continued by returning to FIG.

When the specifying unit 12C specifies that the abnormal portion in the housing 15 is not the second region E2, the specifying portion 12C may further specify the abnormal portion in the first region E1.

Specifically, when the estimated static pressure ΔP'is within the pressure range of the pressure difference ± α or the estimated static pressure ΔP'is less than the pressure range of the pressure difference + α, the specific unit 12C further has a first region. The abnormal part in E1 may be identified by the following method.

For example, in this case, the specific unit 12C has a temperature T at a predetermined temperature measurement point and an estimated temperature at the temperature measurement point of each of at least one heat generating component 24 provided in each of the plurality of electronic devices 20. The variation (standard deviation or variance) of the temperature difference ΔT between T'and T'is specified. The variation of the temperature difference ΔT means the variation (standard deviation or dispersion) of the temperature difference ΔT between the plurality of electronic devices 20. For example, when one heat-generating component 24 is provided in one electronic device 20, the temperature difference ΔT between the temperature T of the heat-generating component 24 and the estimated temperature T'is set to the electron provided with the heat-generating component 24. It may be used as the temperature difference ΔT of the device 20. The case where a plurality of heat generating parts 24 are provided in one electronic device 20 will be described later. Then, in the specific unit 12C, the specified variation of the temperature difference ΔT is different from the variation (standard deviation or dispersion) of the temperature difference ΔT of the electronic device 20 in the predetermined normal state by a first threshold value or more. 20 is further specified as an abnormal part. Since the definition of the normal state has been described above, the description is omitted here.

Specifically, the specific unit 12C obtains the temperature T at a predetermined temperature measurement point of each of at least one heat generating component 24 provided in each of the plurality of electronic devices 20 via the acquisition unit 12A. Accept.

In the present embodiment, the temperature sensors 14B (temperature sensors 14B1 to temperature) provided in each of at least one heat generating component 24 among the plurality of heat generating components 24 arranged in the same (one) electronic device 20. Each installation position of the sensor 14B6) is used as a temperature measurement point. Therefore, the specific unit 12C receives the temperature T at the temperature measurement point by acquiring the measured values of the temperatures of the temperature sensors 14B1 to 14B6 via the acquisition unit 12A.

It is preferable that the temperature measurement point is a point where the time change of the heat flow rate of the heat generating component 24 provided in the electronic device 20 is equal to or less than the second threshold value. The second threshold value may be a value that can be determined in advance so that the heat flow rate does not change with time.

That is, it is preferable that the temperature sensor 14B installed in advance at the temperature measurement point is installed in advance at a point where the time change of the heat generation amount of the heat generating component 24 on which the temperature sensor 14B is mounted is equal to or less than the second threshold value.

The temperature sensor 14B may be installed at a point where the time change of the heat generation amount of the heat generating component 24 on which the temperature sensor 14B is mounted exceeds the second threshold value. In this case, the specific unit 12C corrects the temperature measured by the temperature sensor 14B so that the time change becomes constant according to the time change of the heat generation amount of the heat generating component 24 equipped with the temperature sensor 14B. It is preferable to use the temperature of the above as the temperature T measured by the temperature sensor 14B. The time change of the heat generation amount of the heat generating component 24 may be quantitatively specified in advance, or qualitatively specified by using the current value of the electric power supplied to the heat generating component 24 and the usage rate of the heat generating component 24. You may.

Further, the specific unit 12C derives the estimated temperature T'at the temperature measurement point. That is, in the present embodiment, the specific unit 12C derives the estimated temperature T'of the temperature measurement point, which is the installation position of each of the temperature sensors 14B1 to 14B6.

For example, the specific unit 12C derives the estimated temperature T'at the temperature measurement point by the following method.

The estimated temperature T'at the temperature measurement point can be estimated using, for example, the following equation (7).

Ti'= Qiθi + Ta equation (7)

In the formula (7), Ti'indicates the temperature of the heat generating component 24. Qi indicates the heat flow rate of the heat generating component 24. θi indicates the thermal resistance between the heat generating component 24 and the ambient temperature. The environmental temperature indicates the temperature (outside air temperature) of the air outside the heat generating component 24. Ta indicates the ambient temperature. In the formula (7), i is the identification information of the heat generating component 24.

In the present embodiment, the plurality of electronic devices 20 provided in the first region E1 are arranged in parallel along the second direction Y. Therefore, the environmental temperature Ta can be regarded as the same value among the plurality of electronic devices 20. Therefore, the specific unit 12C may use a preset fixed value as the environmental temperature Ta.

The heat flow rate Qi of the heat generating component 24 may be acquired by the acquisition unit 12A. The acquisition unit 12A may acquire information indicating the heat flow rate Qi from the sensor 14 provided in the housing 15 for measuring the heat flow rate Qi. The acquisition unit 12A may acquire the heat flow rate Qi by acquiring the information for calculating the heat flow rate Qi from the sensor 14 and calculating the heat flow rate Qi by a known method.

It is assumed that the heat generating component 24 and the thermal resistance θi, which is the ambient temperature, change only by the flow rate of the wind W. Then, it can be said that the thermal resistance θi depends on the velocity of the wind W. In other words, since the electric surface area of each of the heat generating components 24 does not change while the abnormality detection device 10 is being driven, it can be said that the decrease in the flow rate of the wind W is equivalent to the decrease in the speed of the wind W.

Therefore, it can be said that the thermal resistance θ depends on the rotation speed n of the blower 22. Therefore, the specific unit 12C stores in advance the thermal resistance management information indicating the correspondence between the rotation speed n of the blower 22 and the thermal resistance θi in the storage unit 28. Then, the specific unit 12C may derive the thermal resistance θi of each of the heat generating components 24 by reading the thermal resistance θi corresponding to the rotation speed n acquired by the acquisition unit 12A from the thermal resistance management information.

The specific unit 12C generates in advance a function or a learning device showing the relationship between the rotation speed n of the blower 22 and the thermal resistance θi of each of the heat generating components 24, and derives the thermal resistance θi from the rotation speed n. May be good.

As described above, the specific unit 12C derives the estimated temperature T'of each temperature measurement point by substituting the rotation speed n and the heat flow rate Qi of the blower 22 into the above equation (7).

Then, the specific unit 12C is the temperature difference between the temperature T at the predetermined temperature measurement point and the estimated temperature T'at the temperature measurement point of each of the heat generating parts 24 provided in each of the plurality of electronic devices 20. Derivation of ΔT.

As described above, since a fixed value preset as the environmental temperature Ta is used, the temperature difference ΔT shows a certain error range in each of the plurality of electronic devices 20 under the normal state.

On the other hand, the temperature difference ΔT of the electronic device 20 in the abnormal state is different from the temperature difference ΔT of the electronic device 20 in the normal state by the first threshold value or more. That is, the temperature difference ΔT of the electronic device 20 in the abnormal state and the temperature difference ΔT of the electronic device 20 in the normal state are significantly different values (specifically, values different by the first threshold value or more).

Therefore, in the present embodiment, in the specific unit 12C, the variation of the temperature difference ΔT differs from the variation (standard deviation or dispersion) of the temperature difference ΔT of the electronic device 20 in the normal state by a first threshold value or more. Is further specified as an abnormal part. The first threshold value may be a threshold value for discriminating that it is significantly different from the temperature difference ΔT of the electronic device 20 in the normal state, and may be set in advance.

In the specific unit 12C, when the variation of the temperature difference ΔT of the plurality of electronic devices 20 exceeds a certain value, the temperature difference farthest from the average value of the variation of the temperature difference ΔT of the electronic devices 20 in the normal state. The electronic device 20 showing ΔT may be specified as an abnormal location. The variation in the temperature difference ΔT of the electronic device 20 in the normal state, which is specifically used by the specific unit 12C, may be measured in advance and stored in the storage unit 28. Further, the variation in the temperature difference ΔT of the electronic device 20 in the normal state may be the average value of the variation (standard deviation or dispersion) of the temperature difference ΔT of each of the plurality of electronic devices 20 in the normal state.

Here, one electronic device 20 may be provided with a plurality of heat generating components 24. Then, it is assumed that the temperature sensor 14B is provided in at least one of the plurality of heat generating components 24.

In this case, the specific unit 12C has a temperature difference ΔT between the temperature T at the temperature measurement point and the estimated temperature T'of each of the plurality of heat generating components 24 provided in the electronic device 20 for each electronic device 20. The average value may be calculated. Then, the specific unit 12C may use the calculated average value of the temperature difference ΔT as the temperature difference ΔT of the electronic device 20. The specific unit 12C sets the temperature difference ΔT indicating the maximum value or the temperature difference ΔT indicating the minimum value among the temperature differences ΔT of each of the plurality of heat generating components 24 provided in the electronic device 20. It may be used as a temperature difference ΔT of 20.

As described above, when the specific unit 12C determines that the second region E2 is not an abnormal location, the specific unit 12C determines that the second region E2 is not an abnormal location, and based on the rotation speed n of the blower 22 and the heat flow rate Qi, the plurality of electronic devices 20 in the first region E1. It is possible to further specify which of the electronic devices 20 is the abnormal location.

Next, the output control unit 12D will be described.

The output control unit 12D outputs the specific result information including the information indicating the abnormal portion specified by the specific unit 12C to the output unit 26. The specific result information may include at least information indicating the identified abnormal location. In addition, the specific result information may further include the above-mentioned degree of abnormality. In this case, the specific unit 12C may calculate the degree of abnormality.

The output unit 26 outputs the received specific result information. When the output unit 26 has a display function, the output unit 26 displays the specific result information. When the output unit 26 has a sound output function, the output unit 26 displays a sound indicating specific result information. Therefore, it is possible to easily present the abnormal portion to the user. Therefore, the user can easily perform the maintenance work of the abnormal portion shown in the specific result information by confirming the output specific result information. That is, the output control unit 12D can appropriately provide the user with information necessary for maintenance work.

When the output unit 26 has a communication function, the output unit 26 transmits the specific result information to the external device 50 via the network N. The external device 50 that has received the specific result information uses the specific result information to remotely monitor the abnormality detection device 10 that is the source of the specific result information, process the specific result information, analyze the specific result information, and the present invention. Various processes such as transferring the specific result information to another external device may be executed. The external device or the transfer destination device may be a server device of a service provider in charge of maintenance work.

FIG. 6 is a flowchart showing an example of the flow of the abnormality detection process executed by the control unit 12. The order of each of the plurality of steps can be arbitrarily changed, and is not limited to the example of FIG. In addition, at least a part of the plurality of steps may be executed in parallel.

The acquisition unit 12A acquires the first pressure from the pressure sensor 14A and acquires the second pressure from the temperature sensor 14B (step S100).

The lead-out unit 12B derives the absolute value of the pressure difference between the first pressure and the second pressure acquired in step S100 as the pressure difference ΔP (step S102).

Next, the acquisition unit 12A acquires the rotation speed n of the blower 22 (step S104). As described above, the acquisition unit 12A acquires the rotation speed n by acquiring the measured value of the rotation speed of the blower 22. Further, the acquisition unit 12A acquires the rotation speed n of the blower 22 by calculating the rotation speed n of the blower 22 from parameters such as the current value or voltage value received from the sensor 14C using a known function or the like. You may. At this time, the acquisition unit 12A also acquires the heat flow rate Qi.

Next, the specification unit 12C includes a ΔP ^₀ / _{N 0} ² value is a constant that is stored in the storage unit 28, the rotational speed and n obtained in step S104, the by substituting into the above formula (B) , Estimated static pressure ΔP'is calculated (step S106).

Next, the specific unit 12C compares the magnitude relationship between the pressure difference ΔP derived in step S102 and the estimated static pressure ΔP'calculated in step S106 (step S108).

When the specific unit 12C determines that the relationship of "estimated static pressure ΔP'> pressure difference ΔP ± α" is satisfied, the process proceeds to step S110.

In step S110, the identification unit 12C identifies the second region E2 as an abnormal portion (step S110). Then, the specific unit 12C calculates the degree of abnormality β (step S112). The specific unit 12C may calculate the abnormality degree β by substituting the pressure difference ΔP derived in step S102 and the estimated static pressure ΔP'calculated in step S106 into the above equation (6).

Then, the output control unit 12D outputs the specific result information including the information indicating the abnormality location identified in step S110 and the information indicating the degree of abnormality calculated in step S112 to the output unit 26 (step S114). Then, this routine is terminated.

On the other hand, if it is determined in step S108 that the specific unit 12C satisfies the relationship of "estimated static pressure ΔP'= pressure difference ΔP ± α", the process proceeds to step S116. In step S116, the identification unit 12C specifies that there is no abnormal portion in the second region E2, which is a region outside at least the first region E1 in the housing 15 (step S116). Then, the process proceeds to step S120, which will be described later.

On the other hand, if it is determined in step S108 that the specific unit 12C satisfies the relationship of "estimated static pressure ΔP'<pressure difference ΔP ± α", the process proceeds to step S118. In step S18, the identification unit 12C identifies the second region E2 as an abnormal portion. Then, the process proceeds to step S120, which will be described later.

The specifying unit 12C may end this routine after outputting the information indicating the results specified in steps S116 and S118 to the output unit 26 via the output control unit 12D. In the present embodiment, the case of proceeding to step S120, which will be described later, after each of step S116 and step S118 will be described as an example.

In step S120, the acquisition unit 12A acquires the temperature T at the temperature measurement point, which is the installation position, from each of the temperature sensors 14B (temperature sensor 14B1 to temperature sensor 14B6) (step S120).

Next, the identification unit 12C derives the estimated temperature T'at the temperature measurement point, which is the installation position of each of the temperature sensors 14B (temperature sensors 14B1 to 14B6) (step S122). As described above, the specific unit 12C derives the estimated temperature T'of each temperature measurement point by using the rotation speed n and the heat flow rate Qi of the blower 22 acquired in step S104 and the above equation (7). To do.

Then, the specific unit 12C derives the temperature difference ΔT between the temperature T acquired in step S120 and the estimated temperature T'calculated in step S122 for each of the temperature measurement points (step S124).

Next, in the specific unit 12C, the heat generation component 24 in which the variation of the temperature difference ΔT derived in step S124 is different from the variation (standard deviation or dispersion) of the temperature difference ΔT of the electronic device 20 in the normal state by the first threshold value or more. The electronic device 20 provided with the above is specified as an abnormal portion (step S126). As described above, in the specific unit 12C, when the variation of the temperature difference ΔT of the plurality of electronic devices 20 derived in step S124 exceeds a certain value, the temperature difference ΔT of the electronic device 20 in the normal state The electronic device 20 showing the temperature difference ΔT farthest from the average value of the variation may be specified as an abnormal portion.

Next, the output control unit 12D outputs the specific result information including the information indicating the abnormal portion identified in step S126 to the output unit 26 (step S128). Then, this routine is terminated.

As described above, the abnormality detection device 10 of the present embodiment includes a blower 22, a plurality of electronic devices 20, a lead-out unit 12B, and a specific unit 12C. The blower 22 sends the wind W into the housing 15. The plurality of electronic devices 20 are arranged in the housing 15 and arranged in parallel in the second direction Y intersecting with the first direction X into which the wind W flows. The lead-out unit 12B has a first pressure on the upstream side in the first direction X from the plurality of electronic devices 20 and a second pressure on the downstream side in the first direction X from the plurality of electronic devices 20 in the housing 15. The pressure difference ΔP from the pressure is derived. The identification unit 12C identifies an abnormal portion in the housing 15 based on the pressure difference ΔP and the estimated static pressure ΔP'which is an estimated value of the static pressure in the housing 15.

Here, in the prior art, it is necessary to install a plurality of types of sensors for detecting an abnormality that may occur at each of a large number of locations where an abnormality is expected to occur, and the abnormal location can be easily identified. That was difficult. Further, in the prior art, as the number of electronic devices 20 installed in the housing 15 increases, it is necessary to install a larger number of sensors.

On the other hand, in the abnormality detection device 10 of the present embodiment, the first pressure on the upstream side of the first direction X of the plurality of electronic devices 20 arranged in parallel in the housing 15 and the first direction X. The abnormal portion in the housing 15 is identified by using the pressure difference ΔP of the second pressure on the downstream side of the housing 15 and the estimated static pressure ΔP'in the housing 15.

Therefore, in the abnormality detection device 10 of the present embodiment, only the first pressure and the second pressure used for deriving the pressure difference ΔP and the measured value used for calculating the estimated static pressure ΔP'are used. An abnormal portion in the housing 15 can be easily identified.

Therefore, the abnormality detection device 10 of the present embodiment can easily identify the abnormality location.

Further, when the identification unit 12C specifies that the abnormal portion in the housing 15 is not the second region E2, or when it is specified that the abnormal portion is the first region E1, the plurality of electronic devices 20 The variation of the temperature difference ΔT between the temperature T at the predetermined temperature measurement point and the estimated temperature T'at the temperature measurement point of each of the heat generating parts 24 provided in each is in the normal state of the electronic device 20. An electronic device 20 that differs from the variation in the temperature difference ΔT by the first threshold value or more is further specified as an abnormal portion.

Therefore, the abnormality detection device 10 of the present embodiment accurately determines which electronic device 20 in the first region E1 is abnormal when the abnormal portion of the housing 15 is not in the second region E2. It can be identified well and easily.

(Modification example)
In the above embodiment, a mode in which two pressure sensors 14A are arranged in the housing 15 has been described as an example. However, three or more pressure sensors 14A may be arranged in the housing 15.

FIG. 7 is a schematic view showing an example of the configuration of the abnormality detection device 10A of this modified example. The abnormality detection device 10A has the same configuration as the abnormality detection device 10 except that the number of pressure sensors 14A is three or more. Therefore, FIG. 7 schematically shows a portion of the housing 15 in the abnormality detection device 10A.

For example, the anomaly detection device 10A includes five pressure sensors 14A. These pressure sensors 14A are arranged on the upstream side of the first direction X from the plurality of electronic devices 20 and on the downstream side of the first direction X from the plurality of electronic devices 20. It is classified into a second pressure sensor.

In the example shown in FIG. 7, a first pressure sensor 14A4, a first pressure sensor 14A3, and a first pressure sensor 14A1 are located upstream of the plurality of electronic devices 20 in the first direction X in the housing 15. Are arranged at different positions along the first direction X.

Further, on the downstream side of the plurality of electronic devices 20 in the housing 15 in the first direction X, the second pressure sensor 14A2 and the second pressure sensor 14A5 are different from each other along the first direction X. It is placed in position.

In this case, the acquisition unit 12A acquires the first pressure from each of the first pressure sensor 14A4, the first pressure sensor 14A3, and the first pressure sensor 14A1 in the housing 15. Further, the acquisition unit 12A acquires the second pressure from each of the second pressure sensor 14A2 and the second pressure sensor 14A5.

Then, the lead-out unit 12B derives the pressure difference ΔP of each of a plurality of sets having different combinations of the first pressure and the second pressure.

For example, as in the above embodiment, the installation position of the first pressure sensor 14A1 in the housing 15 is set as the point PB, and the installation position of the second pressure sensor 14A2 is set as the point PC. Similarly, the installation positions of the first pressure sensor 14A4, the first pressure sensor 14A3, and the second pressure sensor 14A5 in the housing 15 are designated as the point PE, the point PF, and the point PG.

Then, the out-licensing unit 12B is used between the point PE and the point PC, between the point PE and the point PG, between the point PF and the point PC, between the point PF and the point PG, and between the point PB and the point PC. The pressure difference ΔP between the points PB and the point PG and the estimated static pressure ΔP'between the points are derived. Derivation of the estimated static pressure ΔP'between each point is the same as that of the above embodiment.

Then, the specific unit 12C has a pressure difference ΔP of each of the plurality of sets having different combinations of the first pressure and the second pressure, and each first pressure sensor of the set (first pressure sensor 14A4, The magnitude relationship between the estimated static pressure ΔP'between the first pressure sensor 14A3 and the first pressure sensor 14A1) and the second pressure sensor (the second pressure sensor 14A2 and the second pressure sensor 14A5). An abnormal portion in the housing is identified according to each of the above.

The specific unit 12C uses the pressure difference ΔP between the points and the estimated static pressure ΔP'to form an outer region (second region E2) and an inner region between the points in the same manner as in the above embodiment. It suffices to specify which of (first region E1) is the abnormal part.

Then, the specific unit 12C may specify the narrowest region among the plurality of regions specified as abnormal locations, or the overlapping region where the plurality of regions specified as abnormal locations overlap as abnormal locations. ..

As described above, in this modification, the lead-out unit 12B is arranged on the upstream side of the first direction X from the plurality of electronic devices 20 in the housing 15, and the positions in the first direction X are different from each other. A plurality of first pressures are obtained from each of the first pressure sensors (first pressure sensor 14A4, first pressure sensor 14A3, and first pressure sensor 14A1). Further, the lead-out unit 12B is a plurality of second pressure sensors (which are arranged on the downstream side of the first direction X from the plurality of electronic devices 20 in the housing 15 and whose positions in the first direction X are different from each other). A plurality of second pressures are acquired from each of the second pressure sensor 14A2 and the second pressure sensor 14A5). Then, the lead-out unit 12B derives the pressure difference ΔP of each of a plurality of sets having different combinations of the first pressure and the second pressure.

Then, the specific unit 12C is an estimated value of the static pressure between the pressure difference ΔP of each of the plurality of the above sets and the first pressure sensor and the second pressure sensor of each of the plurality of the above sets in the housing 15. An abnormal portion in the housing 15 is specified according to each of the magnitude relations with a certain estimated static pressure ΔP'.

Therefore, in the present modification, in addition to the effect of the above-described embodiment, the abnormal portion of the second region E2 can be accurately identified.

(Modification 2)
In the above embodiment and the above modification, it is assumed that one group of a plurality of electronic devices 20 arranged in parallel along the second direction Y is installed in the housing 15. I explained. However, in the housing 15, another electronic device 20 may be further installed on at least one of the upstream side of the first direction X and the downstream side of the first direction X of the group.

That is, in the housing 15, a first group consisting of a plurality of electronic devices 20 arranged in parallel along the second direction Y, an upstream side of the first direction X with respect to the first group, and A plurality of groups including one or a plurality of second groups consisting of one or a plurality of electronic devices 20 arranged in series with at least one of the downstream sides may be formed.

Then, for each group, the pressure sensors 14A may be installed on each of the upstream side and the downstream side of the first direction X without interposing the other groups.

That is, for example, at least one between the point PE and the point PG, between the point PF and the point PB, and between the point PC and the point PG in the housing 15 of the abnormality detection device 10A shown in FIG. The configuration may be such that one or a plurality of electronic devices 20 are arranged in the area. When a plurality of electronic devices 20 are arranged, they may be arranged in parallel along the second direction Y.

In this case, for each of the groups (first group, second group), the pressure sensor 14A arranged on the upstream side of the first direction X without interposing the other group is the first pressure sensor 14A for each group. It functions as a pressure sensor of 1. Further, for each of the groups (first group, second group), a pressure sensor 14A arranged on the downstream side of the first direction X without interposing another group is provided as a second pressure sensor for each group. Functions as a pressure sensor.

Then, the out-licensing unit 12B may derive the pressure difference Δ and the estimated static pressure ΔP'for each group in the same manner as in the above-described embodiment and the above-described modification.

Then, the specifying unit 12C may specify an abnormal portion in the housing 15 according to each of the magnitude relations between the pressure difference ΔP of each of the plurality of the above groups and the pressure difference ΔP.

The specific unit 12C is an outer region (second region) between the points of the first pressure sensor and the second pressure sensor used for calculating the pressure difference ΔP of each group in the same manner as in the above embodiment. It is sufficient to specify which of the E2) and the inner region (first region E1) is the abnormal portion.

As described above, even when a plurality of groups of a plurality of electronic devices 20 arranged in parallel along the second direction Y are installed in the housing 15, the same effect as that of the above embodiment can be obtained. You can get it.

(Modification 3)
In the above embodiment, the blower 22 is described as an example in a form in which the blower 22 is arranged in the opening at one end in the longitudinal direction of the housing 15 (see FIG. 1). However, the blower 22 may be arranged at a position where the wind W can be sent into the housing 15.

For example, the blower 22 may be arranged outside the housing 15.

FIG. 8 is a schematic view showing an example of a form in which the blower 22 is arranged outside the housing 15.

In this modification, the blower 22 is arranged outside the housing 15. The blower 22 blows the wind W into the housing 15 through the ventilation pipe 60. The ventilation pipe 60 may be referred to as a duct.

Inside the housing 15, a plurality of electronic devices 20 are arranged in parallel along the second direction Y, as in the above embodiment.

Therefore, the wind W sent into the housing 15 through the ventilation pipe 60 by the drive of the blower 22 intersects the arrangement direction (second direction Y) of the plurality of electronic devices 20 arranged in parallel. It flows in (first direction X) and is discharged to the outside through the discharge pipe 62.

Also in this case, the specific unit 12C is the first measured by the first pressure sensor 14A1 on the upstream side of the first direction X of the plurality of electronic devices 20 in the housing 15, as in the above embodiment. The abnormal part may be identified by using the pressure of the above, the second pressure measured by the second pressure sensor 14A2 on the downstream side, and the rotation speed n of the blower 22.

In this way, the blower 22 may be arranged outside the housing 15.

-Hardware configuration-
Next, the hardware configuration of the control unit 12 of the above embodiment and the modified example will be described.

FIG. 9 is a block diagram showing a hardware configuration example of the control unit 12 of the above-described embodiment and modification.

The control unit 12 of the above-described embodiment and modification is connected to a control device such as a CPU (Central Processing Unit) 51, a storage device such as a ROM (Read Only Memory) 52 or a RAM (Random Access Memory) 53, and a network. It is provided with a communication I / F 54 for communicating with each other and a bus 61 for connecting each unit.

The program executed by the control unit 12 of the above-described embodiment and the modified example is provided by being incorporated in the ROM 52 or the like in advance.

The program executed by the control unit 12 of the above-described embodiment and modified example is a file in an installable format or an executable format, which is a CD-ROM (Computer Disk Read Only Memory), a flexible disk (FD), or a CD-R. (Compact Disk Recordable), DVD (Digital Versaille Disk), or the like may be configured to be recorded on a computer-readable recording medium and provided as a computer program product.

Further, the program executed by the control unit 12 of the above-described embodiment and the modified example may be stored on a computer connected to a network such as the Internet and provided by downloading via the network. .. Further, the program executed by the control unit 12 of the above-described embodiment and modified example may be provided or distributed via a network such as the Internet.

The program executed by the control unit 12 of the embodiment and the modification can cause the computer to function as each part of the control unit 12 of the embodiment and the modification. The computer can read a program from a computer-readable storage medium onto the main storage device and execute the program.

Although some embodiments and modifications of the present invention have been described, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These novel embodiments and modifications can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10, 10A Abnormality detection device 12A Acquisition unit 12B Derivation unit 12C Specific unit 14 Sensor 14A Pressure sensor 14B Temperature sensor 20 Electronic device 22 Blower

Claims (14)

A blower that blows air into the housing,
A plurality of electronic devices arranged in the housing and arranged in parallel in a second direction intersecting with the first direction in which the wind flows.
Pressure difference between a first pressure on the upstream side in the first direction from the plurality of electronic devices and a second pressure on the downstream side in the first direction from the plurality of electronic devices in the housing. And the derivation part that derives
Based on the pressure difference and the estimated static pressure which is an estimated value of the static pressure in the housing, a specific portion for identifying an abnormal portion in the housing and a specific portion.
Anomaly detection device. It is provided with an acquisition unit that acquires the rotation speed of the blower.
The specific part is
An abnormal portion is identified based on the pressure difference and the estimated static pressure derived based on the rotation speed.
The abnormality detection device according to claim 1. The specific part is
When the estimated static pressure is larger than the pressure range including the pressure difference, the first region outside the first region between the first pressure measurement point and the second pressure measurement point in the housing. Identify area 2 as an abnormal location,
The abnormality detection device according to claim 1 or 2. The specific part is
When the estimated static pressure is less than the pressure range, the first region in the housing is specified as an abnormal portion.
The abnormality detection device according to claim 3. The specific part is
When the estimated static pressure is within the pressure range, it is specified that there is no abnormal portion in the second region in the housing.
The abnormality detection device according to claim 3 or 4. The out-licensing unit
The first pressure acquired from the first pressure sensor arranged on the upstream side in the first direction from the plurality of electronic devices in the housing, and
The pressure difference from the second pressure obtained from the second pressure sensor arranged on the downstream side in the first direction from the plurality of electronic devices in the housing is derived.
The abnormality detection device according to any one of claims 1 to 5. The out-licensing unit
A plurality of the first pressure sensors arranged on the upstream side of the plurality of electronic devices in the housing in the first direction and having different positions in the first direction from each of the first pressure sensors. Get the pressure of
A plurality of the second pressure sensors arranged on the downstream side of the plurality of electronic devices in the housing and having different positions in the first direction from each of the second pressure sensors. Get the pressure of
The pressure difference of each of a plurality of sets having different combinations of the first pressure and the second pressure was derived.
The specific part is
The estimated static pressure, which is an estimated value of the pressure difference of each of the plurality of the sets and the static pressure between the first pressure sensor and the second pressure sensor of each of the plurality of the sets in the housing. The abnormal part in the housing is identified according to each of the magnitude relations with the pressure.
The abnormality detection device according to claim 6. The plurality of electronic devices
A first group consisting of a plurality of the electronic devices arranged in parallel along the second direction in the housing, and upstream and downstream sides in the first direction with respect to the first group. A plurality of groups including one or a plurality of second groups including one or a plurality of the electronic devices arranged in series with at least one of the above.
The out-licensing unit
For each of the plurality of the groups, the pressure of the first pressure on the upstream side in the first direction from the group and the pressure of the second pressure on the downstream side in the first direction from the group. Derived the difference,
The specific part is
The pressure difference of each of the plurality of groups, the estimated static pressure which is an estimated value of the static pressure between the first pressure sensor and the second pressure sensor used for deriving the pressure difference, and the estimated static pressure. Identify the abnormal part in the housing according to each of the magnitude relations of
The abnormality detection device according to claim 6 or 7. The blower is arranged outside the housing, and blows air into the housing through a ventilation pipe.
The first direction is the inflow direction of wind into the plurality of electronic devices.
The abnormality detection device according to any one of claims 1 to 8. The specific part is
When it is specified that the abnormal part in the housing is not the second area, or when it is specified that the abnormal part is the first area.
The variation in the temperature difference between the temperature at the predetermined temperature measurement point and the estimated temperature at the temperature measurement point of each of the heat generating parts provided in each of the plurality of electronic devices becomes a predetermined normal state. The electronic device that differs from the variation in the temperature difference of the electronic device by a first threshold value or more is further specified as an abnormal portion.
The abnormality detection device according to any one of claims 3 to 5. The temperature measurement point is
A point where the time change of the heat flow rate of the heat generating component provided in the electronic device is equal to or less than the second threshold value.
The abnormality detection device according to claim 10. An output control unit, which transmits specific result information including information indicating an abnormal location specified by the specific unit to an external device, is provided.
The abnormality detection device according to any one of claims 1 to 10. From a plurality of electronic devices arranged in parallel in a second direction intersecting with a first direction in which the wind sent by a blower that is arranged in the housing and blows air into the housing flows in the housing. A step of deriving a pressure difference between a first pressure on the upstream side in the first direction and a second pressure on the downstream side in the first direction from the plurality of electronic devices.
A step of identifying an abnormal portion in the housing based on the pressure difference and an estimated static pressure which is an estimated value of the static pressure in the housing.
Anomaly detection method comprising. From a plurality of electronic devices arranged in parallel in a second direction intersecting with a first direction in which the wind sent by a blower that is arranged in the housing and blows air into the housing flows in the housing. A step of deriving a pressure difference between a first pressure on the upstream side in the first direction and a second pressure on the downstream side in the first direction from the plurality of electronic devices.
A step of identifying an abnormal portion in the housing based on the pressure difference and an estimated static pressure which is an estimated value of the static pressure in the housing.
A program that lets your computer run.

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