JP7087376B2 - Heat exchanger anomaly detector - Google Patents

Description

The present invention relates to an abnormality detection device for a heat exchanger.

Conventionally, heat exchangers that exchange heat between a high-temperature heat source and a low-temperature heat source are known. Since the heat exchanger mainly uses the movement of the heat medium to exchange heat between the high temperature heat source and the low temperature heat source, the abnormal state of the heat exchanger can be detected by detecting the temperature and flow rate of the heat medium. It is possible to detect. For example, Patent Document 1 describes an inlet temperature sensor capable of detecting the temperature of water flowing into a heat exchanger, an outlet temperature sensor capable of detecting the temperature of water flowing out of a heat exchanger, and a signal output by the incoming water temperature sensor. Described is a hot water supply device comprising a controller that compares the calculated target output with the actual output calculated based on the signal output by the flood temperature sensor and determines whether the actual output has reached the target output. There is.

Japanese Unexamined Patent Publication No. 2008-275226

However, the temperature of the heat medium flowing in the heat exchanger does not change until a certain time has passed since the abnormality occurred in the heat exchanger. That is, since there is a gap between the time when the abnormality occurs in the heat exchanger and the time when the temperature of the heat medium changes, it is not possible to detect the abnormality in the heat exchanger at an appropriate timing. In addition, the temperature of the heat medium differs depending on the type of abnormality that occurs in the heat exchanger, such as physical damage to the heat exchanger, changes in the flow rate of the heat medium, and contamination of the heat medium with foreign matter. When an abnormality in the heat exchanger is detected due to a change, it may not be possible to take appropriate measures for the heat exchanger.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an abnormality detection device for a heat exchanger capable of detecting an abnormality at an appropriate timing.

The present invention relates to an abnormality detection device of a heat exchanger (5) capable of releasing heat from a heat generation source (2) from a heat radiating unit (3) to the outside through a heat medium pipe (6) through which a heat medium can flow. It also includes a heat flux sensor (10, 20) and an abnormality detection unit (30).

The heat flux sensor includes a heat generation side heat flux sensor (10) provided between the heat generation source and the heat medium piping, and a heat dissipation side heat flux sensor (20) provided between the heat dissipation unit and the heat medium piping. It is a heat flux sensor including. The heat flux sensor on the heat generation side and the heat flux sensor on the heat dissipation side are the insulating base material (11), the first interlayer connection member (14), the second interlayer connection member (15), and the wiring pattern (115, 116, respectively). ). The insulating substrate has a plurality of first via holes (111) and a plurality of second via holes (112) formed of a thermoplastic resin and alternately formed so as to penetrate in the thickness direction. The first interlayer connection member is provided in a plurality of first via holes. The second interlayer connecting member is provided in the second via hole and is formed of a metal different from that of the first interlayer connecting member. The wiring pattern alternately connects the first interlayer connection member and the second interlayer connection member. In the heat flux sensor, at least one of the first interlayer connecting member and the second interlayer connecting member is a sintered alloy obtained by solid-phase sintering in which a plurality of metal atoms maintain the crystal structure of the metal atoms. It is possible to detect the size of the heat flux between the heat generation source and the heat medium pipe or between the heat dissipation part and the heat medium pipe, and output a signal according to the size of the heat flux.

The abnormality detection unit is electrically connected to the heat flux sensor, and can detect an abnormality in the heat exchanger based on the signal output by the heat flux sensor . A signal corresponding to the size (Fh1) of the heat flux (A10) from the heat generation source output by the heat generation side heat flux sensor to the heat medium pipe, and the heat dissipation part output by the heat radiation side heat flux sensor to the heat medium pipe. The state of the heat exchanger is determined based on the comparison result (Fd) with the signal corresponding to the magnitude (Fh2) of the heat flux (A20) .

The abnormality detection device of the heat exchanger of the present invention includes a heat flux sensor that detects the magnitude of at least one of the heat flux between the heat generation source and the heat medium pipe and between the heat radiation unit and the heat medium pipe. In the heat exchanger, when an abnormality occurs in the function of the heat exchanger itself, after the size of the heat flow flux between the heat generation source and the heat medium pipe or between the heat dissipation part and the heat medium pipe changes first, The temperature of the heat medium changes. Therefore, the heat exchanger abnormality detection device of the present invention detects an abnormality in the heat exchanger by detecting that the size of the heat flux has changed. As a result, the heat exchanger abnormality detection device of the present invention can detect the heat exchanger abnormality at an appropriate timing and promptly as compared with the case of detecting the heat exchanger abnormality based on the temperature change of the heat medium. Can be done.

It is a schematic diagram of the heat exchange system to which the abnormality detection device of the heat exchanger according to one Embodiment is applied. It is a schematic diagram of the heat flux sensor provided in the heat exchange system to which the abnormality detection device of the heat exchanger according to one Embodiment is applied. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. It is a main flowchart of the state determination process of a heat exchanger in the abnormality detection device of a heat exchanger according to one Embodiment. It is a sub-flow chart of the state determination process of the heat exchanger in the abnormality detection device of the heat exchanger according to one embodiment. It is a characteristic diagram of the state determination process of the heat exchanger in the abnormality detection device of the heat exchanger according to one embodiment. It is a characteristic diagram at the time of abnormality detection in the abnormality detection apparatus of the heat exchanger according to one Embodiment. It is a characteristic diagram at the time of abnormality detection in the abnormality detection device of the heat exchanger according to one embodiment, and is a characteristic diagram different from FIG. 7.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(One embodiment)
The heat flux detection device 1 as the "heat exchanger abnormality detection device" according to the embodiment is applied to the heat exchanger 5 shown in FIG. The heat exchanger 5 has a function of releasing high heat generated by the mechanical device 3 as a “heat generation source” to the outside.

First, the configuration of the heat exchanger 5 will be described with reference to FIG. The heat exchanger 5 includes a pipe 6 as a “heat medium pipe”, a heat dissipation unit 7, and a pump 8.

The pipe 6 is provided so as to connect the mechanical device 3 and the heat radiating unit 7. The pipe 6 can circulate a heat medium capable of transporting the heat of the mechanical device 3 to the heat radiating unit 7.

The heat radiating portion 7 is provided in the pipe 6. The heat radiating portion 7 is formed of a material having relatively high thermal conductivity. The heat radiating unit 7 has, for example, a plurality of fins (not shown) so as to increase the surface area. The heat radiating unit 7 releases the heat of the heat medium flowing in the pipe 6 to the outside.

The pump 8 is provided in the pipe 6 between the mechanical device 3 and the heat radiating unit 7. The pump 8 pumps the heat medium so that the heat medium in the pipe 6 flows in the direction shown by the solid line arrow F6 in FIG.

Next, the configuration of the heat flux detection device 1 will be described with reference to FIGS. 1 to 3. The heat flux detection device 1 includes a first heat flux sensor 10 as a "heat flux generation side heat flux sensor", a second heat flux sensor 20 as a "heat flux radiation side heat flux sensor", and a heat flux calculation as an "abnormality detection unit". A unit 30 and an alarm output unit 40 as an "alarm output unit" are provided. The heat flux detecting device 1 can detect the size of the heat flux at a specific place of the heat exchanger 5 and determine the state of the heat exchanger 5 according to the size of the heat flux.

As shown in FIG. 1, the first heat flux sensor 10 is provided between the mechanical device 3 and the pipe 6. A heat flux (white arrow A10 in FIG. 1), which is a heat flow between the mechanical device 3 and the pipe 6, passes through the first heat flux sensor 10. The first heat flux sensor 10 outputs a signal corresponding to the magnitude of the heat flux, for example, a voltage signal.

Here, the detailed configuration of the first heat flux sensor 10 will be described with reference to FIGS. 2 and 3. As shown in FIG. 3, the first heat flux sensor 10 has an insulating base material 11, a back surface protection member 12, a surface protection member 13, a first interlayer connection member 14, and a second interlayer connection member 15. In addition, in FIG. 3, in order to make the configuration of the first heat flux sensor 10 easy to understand, the direction from the back surface protection member 12 to the front surface protection member 13 is enlarged as compared with the actual shape.

The insulating base material 11 is formed of a film made of a thermoplastic resin. The insulating base material 11 has a plurality of first via holes 111 penetrating in the thickness direction and a plurality of second via holes 112. As shown in FIG. 3, the first via hole 111 and the second via hole 112 are provided so as to be adjacent to each other. A first interlayer connection member 14 is provided in the first via hole 111. A second interlayer connecting member 15 is provided in the second via hole 112. That is, on the insulating base material 11, the first interlayer connecting member 14 and the second interlayer connecting member 15 are arranged so as to be separated from each other and staggered.

The back surface protective member 12 is made of a film made of a thermoplastic resin having the same size as that of the insulating base material 11. The back surface protective member 12 is provided on the back surface 113 of the insulating base material 11. A back surface pattern 115 as a plurality of "wiring patterns" in which copper foil or the like is patterned is provided between the back surface 113 of the insulating base material 11 and the surface 121 on the back surface protective member 12 side of the insulating base material 12. .. The back surface pattern 115 electrically connects the first interlayer connection member 14 and the second interlayer connection member 15.

The surface protection member 13 is made of a film made of a thermoplastic resin having the same size as that of the insulating base material 11. The surface protection member 13 is provided on the surface 114 of the insulating base material 11. A surface pattern 116 as a plurality of "wiring patterns" in which copper foil or the like is patterned is formed between the surface 114 of the insulating base material 11 and the surface 131 on the insulating base material 11 side of the surface protection member 13. .. The surface pattern 116 electrically connects the first interlayer connection member 14 and the second interlayer connection member 15.

The plurality of first interlayer connecting members 14 and the plurality of second interlayer connecting members 15 are made of different metals so as to exert a Zeebeck effect. For example, the first interlayer connection member 14 is made of a metal compound in which the powder of the Bi-Sb-Te alloy constituting the P type is solid-phase sintered so as to maintain the crystal structure of a plurality of metal atoms before sintering. It is formed. Further, the second interlayer connection member 15 is formed of a metal compound solid-phase sintered so that the powder of the Bi—Te alloy constituting the N type maintains a predetermined crystal structure of a plurality of metal atoms before sintering. Has been done. The first interlayer connection member 14 and the second interlayer connection member 15 are alternately connected in series by a back surface pattern 115 and a front surface pattern 116.

As shown in FIG. 3, one of the plurality of first interlayer connection members 14 is electrically connected to the terminal 141. Further, the second interlayer connection member 150 of the plurality of second interlayer connection members 15 is electrically connected to the terminal 151. As shown in FIG. 2, the terminals 141 and 151 meander in the back surface pattern 115, the first interlayer connection member 14, the front surface pattern 116, and the second interlayer connection member 15 in one first heat flux sensor 10. It is located at both ends connected so as to (see the two-dot chain line L10 in FIG. 2). The terminals 141 and 151 are exposed to the outside through the opening 132 of the surface protection member 13.
The terminal 141 is electrically connected to the output line 143 via the connection bump 142. The terminal 151 is electrically connected to the output line 153 via the connection bump 152. The output lines 143 and 153 are electrically connected to the heat flux calculation unit 30.

In the first heat flux sensor 10, when the magnitude of the amount of heat flowing in the thickness direction of the first heat flux sensor 10 (direction from the back surface protection member 12 to the front surface protection member 13 in FIG. 3) changes, they are alternately connected in series. The electromotive voltage generated in the first interlayer connection member 14 and the second interlayer connection member 15 changes. The first heat flux sensor 10 outputs this voltage as a detection signal via the output lines 143 and 153 to the heat flux calculation unit 30 which is electrically connected.

As shown in FIG. 1, the second heat flux sensor 20 is provided between the pipe 6 and the heat dissipation unit 7. A heat flux (white arrow A20 in FIG. 1), which is a heat flow between the pipe 6 and the heat radiating portion 7, passes through the second heat flux sensor 20. The second heat flux sensor 20 outputs a signal corresponding to the size of the heat flux, for example, a voltage signal to the heat flux calculation unit 30 which is electrically connected. Since the configuration of the second heat flux sensor 20 is the same as the configuration of the first heat flux sensor 10, the description of the configuration will be omitted.

The heat flux calculation unit 30 has a microcomputer as a small computer having a CPU as a calculation means, a ROM and a RAM as a storage means, and the like. The microcomputer executes various processes by the CPU according to various programs stored in the ROM. The heat flux calculation unit 30 of the heat flux A10 between the mechanical device 3 and the pipe 6 is based on a signal corresponding to the size of the heat flux output by the first heat flux sensor 10 and the second heat flux sensor 20. The magnitude Fh1 (hereinafter, simply referred to as “heat flux Fh1”) and the magnitude Fh2 of the heat flux A20 between the pipe 6 and the heat radiating portion 7 (hereinafter, simply referred to as “heat flux Fh2”) are calculated. Further, the heat flux calculation unit 30 determines the state of the heat exchanger 5 based on the calculation results of the heat flux Fh1 and Fh2. The processing in the heat flux calculation unit 30 may be software processing by executing a program stored in advance in a substantive memory device such as a ROM on the CPU, or hardware processing by a dedicated electronic circuit. May be good. Details of the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 will be described later.

The alarm output unit 40 is electrically connected to the heat flux calculation unit 30. The alarm output unit 40 outputs an alarm notifying the abnormality of the heat exchanger 5 to the outside based on the result of the state determination of the heat exchanger 5 in the heat flux calculation unit 30.

Here, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 will be described with reference to FIGS. 4 to 6. FIGS. 4 and 5 show a flowchart of the state determination process of the heat exchanger 5 by the heat flux calculation unit 30. FIG. 6 shows a characteristic diagram in the state determination process of the heat exchanger 5 by the heat flux calculation unit 30. The processing of the flowchart shown in FIGS. 4 and 5 is always executed when the heat exchanger 5 is operating.

First, in step 1 (hereinafter, simply referred to as “S”) 1, the magnitude of the heat flux Fh1 between the mechanical device 3 and the pipe 6 is calculated. The heat flux calculation unit 30 calculates the magnitude of the heat flux Fh1 between the mechanical device 3 and the pipe 6 based on the signal output by the first heat flux sensor 10. In the present embodiment, when heat is transferred from the mechanical device 3 toward the pipe 6, the heat flux Fh1 is set to a positive value.

Next, in S2, the magnitude of the heat flux Fh2 between the pipe 6 and the heat dissipation unit 7 is calculated. The heat flux calculation unit 30 calculates the magnitude of the heat flux Fh2 between the pipe 6 and the heat dissipation unit 7 based on the signal output by the second heat flux sensor 20. In the present embodiment, when heat is transferred from the pipe 6 toward the heat radiating portion 7, the heat flux Fh2 is set to a positive value.

Next, in S3, the heat flux balance in the heat exchanger 5 is calculated. The heat flux calculation unit 30 subtracts the heat flux Fh2 calculated in S2 from the heat flux Fh1 calculated in S1 and calculates the heat flux balance Fd as the "comparison result" of the heat medium flowing through the pipe 6. In the case of the present embodiment, the heat flux balance Fd is the difference between the amount of heat flowing into the pipe 6 from the mechanical device 3 and the amount of heat flowing out from the pipe 6 to the heat radiating unit 7.

Next, in S4, it is determined whether or not the heat flux balance Fd is larger than the predetermined threshold value Fth. The heat flux calculation unit 30 determines whether or not the heat flux balance Fd calculated in S3 is larger than the predetermined threshold value Fth. Here, the predetermined threshold value Fth is, for example, 0 or a detection error of the first heat flux sensor 10 and the second heat flux sensor 20. If it is determined that the heat flux balance Fd is larger than the predetermined threshold value Fth, the process proceeds to S5. When it is determined that the heat flux balance Fd is equal to or less than the predetermined threshold value Fth, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 is terminated.

When it is determined in S4 that the heat flux balance Fd is larger than the predetermined threshold value Fth, in S5, the heat flux calculation unit 30 determines the abnormality treatment of the heat exchanger 5. The abnormality treatment determination in S5 is performed according to the flowchart shown in FIG. In the present embodiment, the flowchart shown in FIG. 5 is performed for both the first heat flux sensor 10 and the second heat flux sensor 20. Here, the processing based on the signal output by the first heat flux sensor 10 will be described, but the same applies to the second heat flux sensor 20.

First, in S50, the amount of change in heat flux ΔFh is calculated. The heat flux calculation unit 30 calculates the amount of change ΔFh1 in the heat flux Fh1 of the first heat flux sensor 10 when it is determined in S4 that the heat flux balance Fd is equal to or less than a predetermined threshold value Fth.

The change amount ΔFh1 of the heat flux will be specifically described with reference to FIG. In the characteristic diagram shown in FIG. 6, the horizontal axis is time, and the vertical axis is the heat flux Fh1 from the mechanical device 3 detected by the first heat flux sensor 10 to the pipe 6. In FIG. 6, before the time t0, it is determined in S4 that the heat flux balance Fd is equal to or less than the predetermined threshold value Fth. The value of the heat flux Fh1 at this time is defined as the heat flux Fh10.

When it is determined that the heat flux balance Fd is larger than the predetermined threshold value Fth at time t0, for example, the heat flux Fh1 gradually decreases (solid lines L61, L62, L63 shown in FIG. 6). At this time, the heat flux Fh1 becomes a relatively stable value after the time t0 in FIG. As an example of the heat flux Fh1 at this time, FIG. 6 shows the heat flux Fh11 at the time of the solid line L61, the heat flux Fh12 at the time of the solid line L62, and the heat flux Fh13 at the time of the solid line L63.

When the heat flux Fh1 becomes the heat flux Fh11 after the time t0, the heat flux calculation unit 30 calculates the change amount ΔFh1 of the heat flux as (Fh10-Fh11). When the heat flux Fh1 becomes the heat flux Fh12 after the time t0, the heat flux calculation unit 30 calculates the change amount ΔFh1 of the heat flux as (Fh10-Fh12). When the heat flux Fh1 becomes the heat flux Fh13 after the time t0, the heat flux calculation unit 30 calculates the change amount ΔFh1 of the heat flux as (Fh10-Fh13).

Next, in S51, the heat flux calculation unit 30 determines whether or not the change amount ΔFh1 of the heat flux calculated in S50 is equal to or greater than the change amount ΔFhx of the predetermined heat flux. Here, the change amount ΔFhx of the predetermined heat flux is a value obtained by subtracting the heat flux Fhx shown in FIG. 6 from the heat flux Fh10, and is larger than the change amounts ΔFhy and ΔFhz of the predetermined heat flux described later, for example. It is a value that occupies most of the heat exchange capacity of the heat exchanger 5. When it is determined that the change amount ΔFh1 of the heat flux is equal to or more than the change amount ΔFhx of the predetermined heat flux, for example, the heat flux Fh1 is the heat flux Fh11 shown in FIG. 6, the process proceeds to S52. When it is determined that the change amount ΔFh1 of the heat flux is smaller than the change amount ΔFhx of the predetermined heat flux, for example, the heat flux Fh1 is the heat flux Fh12, Fh13 shown in FIG. 6, the process proceeds to S53.

When it is determined in S51 that the change amount ΔFh1 of the heat flux is equal to or greater than the predetermined change amount ΔFhx of the heat flux, in S52, the heat flux calculation unit 30 outputs the alarm of the procedure A to the alarm output unit 40. Output a signal. Treatment A is, for example, an abnormal stop of the heat exchanger 5. After that, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 is completed.

When it is determined in S51 that the change amount ΔFh1 of the heat flux is smaller than the change amount ΔFhx of the predetermined heat flux, in S53, the heat flux calculation unit 30 determines that the change amount ΔFh of the heat flux calculated in S50 is the predetermined heat flux. It is determined whether or not the amount of change of is ΔFhy or more. Here, the change amount ΔFhy of the predetermined heat flux is a value obtained by subtracting the heat flux Fhy shown in FIG. 6 from the heat flux Fh10, and is larger than the change amount ΔFhz of the predetermined heat flux described later, for example, heat exchange. It is a value about half the size of the heat exchange capacity of the vessel 5. When it is determined that the change amount ΔFh1 of the heat flux is equal to or more than the change amount ΔFhy of the predetermined heat flux, for example, the heat flux Fh1 is the heat flux Fh12 shown in FIG. 6, the process proceeds to S54. When it is determined that the change amount ΔFh1 of the heat flux is smaller than the change amount ΔFhy of the predetermined heat flux, for example, the heat flux Fh1 is the heat flux Fh13 shown in FIG. 6, the process proceeds to S55.

When it is determined in S53 that the change amount ΔFh1 of the heat flux is equal to or greater than the change amount ΔFhy of the predetermined heat flux, the heat flux calculation unit 30 outputs the alarm of the procedure B to the alarm output unit 40 in S54. Output a signal. Treatment B is, for example, the output limitation of the heat exchanger 5. After that, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 is completed.

When it is determined in S53 that the change amount ΔFh1 of the heat flux is smaller than the change amount ΔFhy of the predetermined heat flux, in S55, the change amount ΔFh1 of the heat flux calculated in S50 is equal to or more than the change amount ΔFhz of the predetermined heat flux. Judge whether or not. Here, the predetermined change amount ΔFhz of the heat flux is a relatively small value obtained by subtracting the heat flux Fhz from the heat flux Fh10, and is, for example, a part relatively small with respect to the heat exchange capacity of the heat exchanger 5. It is the value of the size it occupies. When it is determined that the change amount ΔFh1 of the heat flux is equal to or more than the change amount ΔFhz of the predetermined heat flux, for example, the heat flux Fh1 is the heat flux Fh13 shown in FIG. 6, the process proceeds to S56. When it is determined that the change amount ΔFh1 of the heat flux is smaller than the change amount ΔFhz of the predetermined heat flux, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 is terminated.

When it is determined in S55 that the change amount ΔFh1 of the heat flux is equal to or larger than the predetermined change amount ΔFhz of the heat flux, in S56, the heat flux calculation unit 30 outputs the alarm of the procedure C to the alarm output unit 40. Output a signal. Treatment C is, for example, the output of a warning regarding the heat exchanger 5. After that, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 is completed.

Generally, when an abnormality occurs in a heat exchanger, the temperature of the heat medium changes after the size of the heat flux, which directly represents the heat exchange capacity of the heat exchanger, first changes. The time variation of the heat flux and the temperature of the heat medium when an abnormality occurs in the heat exchanger will be described with reference to FIG. 7.

When an abnormality occurs in the heat exchanger at the time t0 shown in FIG. 7, the heat flux Fh starts to decrease from the heat flux Fh0 before the time t0 immediately after the time t0, as shown in FIG. 7.

On the other hand, as shown in FIG. 7, the temperature of the heat medium changes after the size of the heat flux changes. Therefore, the temperature of the heat medium, which was initially the temperature T0, becomes equal to or higher than the temperature threshold Tth1 indicating that the heat exchanger is abnormal due to the abnormality of the heat exchanger at the time after the time t0. It becomes t1. That is, the temperature change of the heat medium causes a time (t1-t0) delay as compared with the change of the heat flux. Therefore, when the heat exchanger is abnormally treated based on the temperature change of the heat medium, the treatment may not be in time.

The heat flux detection device 1 according to one embodiment includes a first heat flux sensor 10 and a second heat flux sensor 20 for detecting the size of the heat flux. As a result, the heat flux detection device 1 can directly detect the size of the heat flux that changes immediately when an abnormality occurs. Therefore, the heat flux detecting device 1 can detect the abnormality of the heat exchanger 5 at an appropriate timing and quickly as compared with the case of detecting the abnormality of the heat exchanger 5 based on the temperature change of the heat medium.

Further, the heat exchanger is in an abnormal state due to various reasons such as physical damage to the heat exchanger, a change in the flow rate of the heat medium, and contamination of the heat medium with foreign matter. The heat flux detection device 1 according to one embodiment distinguishes and determines a plurality of abnormal states of the heat exchanger 5 due to these various reasons by detecting the size of the heat flux of each part in the heat exchanger 5. can do.

The relationship between the change in heat flux and the change in temperature of the heat medium when an abnormality occurs in the heat exchanger will be described with reference to FIG. 8, which is different from FIG. 7. FIG. 8 shows different time changes for the size of the heat flux and the temperature of the heat medium when an abnormality occurs in the heat exchanger.

When an abnormality occurs in the heat exchanger at the time t0 shown in FIG. 8, the heat flux Fh starts to decrease from the heat flux Fh0 before the time t0 immediately after the time t0, as shown in FIG. Since the heat flux directly represents the heat exchange capacity of the heat exchanger, it is possible to infer the degree of temperature change of the heat medium from the degree of change in the heat flux. Specifically, when the heat flux drops sharply as shown by the solid line L81 in FIG. 8, the temperature of the heat medium also drops sharply, for example, there is a serious trouble such as physical damage to the heat exchanger. It is presumed that it has occurred. In this case, for example, the heat exchanger is abnormally stopped. Further, when the heat flux gradually decreases as shown by the solid line L82 in FIG. 8, the temperature of the heat medium also gradually decreases, for example, the change in the flow rate of the heat medium or the mixing of foreign matter into the heat medium is not so serious. It is presumed that a problem has occurred. In this case, for example, output restriction or warning to the outside is performed.

On the other hand, when the temperature of the heat medium is detected, as described above, the change in the temperature of the heat medium has a delay compared to the change in the heat flux. It's difficult to do. Specifically, as shown by the two-dot chain line L83 in FIG. 8, when the temperature of the heat medium having the temperature T1 changes after the time t0 and reaches the temperature threshold Tth1 at the time t1, the time is predicted thereafter. It is predictable that the breakage limit threshold Tth2 or higher at t2 will cause the heat exchanger to break. Further, when the temperature of the heat medium having a temperature T2 higher than the temperature T1 changes after the time t0 and reaches the temperature threshold Tth1 at the time t1, as in the solid line L84, the damage limit is predicted thereafter. It is expected that it will take a relatively long time until the threshold value Tth2, as shown by the dotted line L85. However, at time t1, it is difficult to predict the case where the temperature rises in a relatively short time as shown by the dotted line L86 due to the occurrence of other causes after time t1.

The heat flux detection device 1 according to one embodiment detects a change in the size of the heat flux capable of estimating the degree of temperature change in the heat medium by the first heat flux sensor 10 and the second heat flux sensor 20. Can be done. Thereby, it is possible to distinguish and reliably detect a plurality of abnormal states of the heat exchanger 5 due to various reasons.

The heat flux detection device 1 according to one embodiment is a first heat flux sensor 10 that detects the size of the heat flux between the mechanical device 3 and the pipe 6, and the heat flux between the heat dissipation unit 7 and the pipe 6. A second heat flux sensor 20 for detecting the magnitude of the heat flux sensor 20 is provided. This makes it possible to calculate the heat flux balance Fd to the heat medium flowing through the pipe. Therefore, the abnormality of the heat exchanger 5 can be detected with high accuracy.

Further, when detecting an abnormality in the heat exchanger based on the temperature change of the heat medium, it is necessary to perform an operation such as differentiation with respect to the time change of the temperature in order to see the degree of the detected temperature change. On the other hand, the heat flux detecting device 1 according to one embodiment can directly detect the abnormality of the heat exchanger 5 from the change in the size of the heat flux. As a result, the heat flux detection device 1 makes the calculation for detecting the abnormality of the heat exchanger 5 relatively simple, so that the heat flux calculation unit 30 can be simplified and the time required for the calculation can be reduced. Can be shortened.

The heat flux detection device 1 according to one embodiment has an alarm output unit 40 that outputs an alarm notifying an abnormality of the heat exchanger 5 to the outside based on the result of a state determination of the heat exchanger 5 in the heat flux calculation unit 30. Be prepared. As a result, appropriate measures can be taken before the trouble caused by the abnormality of the heat exchanger 5 becomes large.

(Other embodiments)
In the above-described embodiment, the heat radiating unit releases high heat of the mechanical device as a "heat generation source" to the outside. However, the heat radiating unit may release the cold heat of the device that generates cold heat as a "heat generation source" to the outside. When the heat radiating unit releases the cold heat of the device that generates cold heat as a "heat generation source" to the outside, it is determined by whether or not the absolute value of the heat flux balance Fd is larger than the absolute value of the predetermined threshold value Fth in S4. do. Specifically, when the absolute value of the heat flux balance Fd is larger than the absolute value of the predetermined threshold value Fth, the process proceeds to S5. When the absolute value of the heat flux balance Fd is equal to or less than the absolute value of the predetermined threshold value Fth, the state determination process of the heat exchanger 5 by the heat flux calculation unit 30 is terminated.

In the above-described embodiment, in the heat flux detection device including the two heat flux sensors, it is determined whether or not abnormal treatment for the heat exchanger is necessary based on the heat flux balance calculated in S3. In the heat flux detection device provided with only one heat flux sensor, only the processing of the flowchart shown in FIG. 5 may be executed to detect an abnormality.

In the above-described embodiment, the heat flux detection device includes an alarm output unit. The alarm output unit may not be provided.

In the above-described embodiment, as shown in FIG. 4, the heat flux calculation unit calculates the size of the heat flux between the device and the pipe, and then determines the size of the heat flux between the pipe and the heat radiation unit. I decided to calculate. However, S1 and S2 may be processed at the same time.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various embodiments without departing from the gist thereof.

1 ... Heat flux detector (heat exchanger abnormality detector)
3 ... Mechanical equipment (heat generation source)
5 ... Heat exchanger 6 ... Piping (heat medium piping)
7 ... Heat dissipation unit 10 ... First heat flux sensor (heat flux sensor)
20 ... Second heat flux sensor (heat flux sensor)
30 ... Heat flux calculation unit (abnormality detection unit)

Claims (3)

In the abnormality detection device of the heat exchanger (5), which can discharge the heat of the heat generation source (3) from the heat radiating unit (7) to the outside through the heat medium pipe (6) through which the heat medium can flow.
The heat generation side heat flux sensor (10) provided between the heat generation source and the heat medium piping, and the heat dissipation side heat flux sensor (20) provided between the heat dissipation unit and the heat medium piping. The heat flux sensor including the heat generating side heat flux sensor and the heat radiating side heat flux sensor are each formed of a thermoplastic resin and alternately formed so as to penetrate in the thickness direction. (111), an insulating base material (11) having a plurality of second via holes (112), a first interlayer connection member (14) provided in the plurality of first via holes, and the first via hole provided in the first via hole. A second interlayer connection member (15) formed of a metal different from the interlayer connection member, and a wiring pattern (115, 116) for alternately connecting the first interlayer connection member and the second interlayer connection member. The first interlayer connecting member or at least one of the second interlayer connecting members is a sintered alloy obtained by solid-phase sintering in a state where a plurality of metal atoms maintain the crystal structure of the metal atoms. It is possible to detect the size of the heat flux between the heat generation source and the heat medium pipe or between the heat radiation unit and the heat medium pipe, and output a signal according to the size of the heat flow. , Heat flux sensor ,
It is electrically connected to the heat flux sensor, can detect an abnormality in the heat exchanger based on a signal output by the heat flux sensor, and can detect the abnormality of the heat exchanger from the heat generation source output by the heat generation side heat flux sensor. A signal corresponding to the size (Fh1) of the heat flux (A10) to the heat medium pipe and the size (Fh2) of the heat flux (A20) from the heat dissipation portion output by the heat dissipation side heat flux sensor to the heat medium pipe. ), And the abnormality detection unit (30) that determines the state of the heat exchanger based on the comparison result (Fd) with the signal corresponding to ).
Heat exchanger anomaly detector. The abnormality detection unit for the heat exchanger according to claim 1 , wherein the abnormality detection unit can estimate the degree of temperature change of the heat medium based on a signal corresponding to the size of the heat flux output by the heat flux sensor. Device. The abnormality detection device for a heat exchanger according to claim 1 or 2 , further comprising an alarm output unit (40) capable of outputting an alarm according to the determination result based on the determination result of the abnormality detection unit.

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