JP2020144492A - Heating element cooling structure - Google Patents

Abstract

To provide a heating element cooling structure which can easily maintain the cooling fan while extending a life of a cooling fan as well as replace the cooling fan.SOLUTION: The heating element cooling structure has: a heating element such as a thyristor 0101, a fuse 0102, and a snubber circuit 0103 installed on a back surface B; a control unit 0115; a pair of terminals 0104A, 0104B located below the heating element to which power cables 0108, 0109 are connected; a heat sink 0120 provided on the back of the heating element; an air passage 0107 which houses the heat sink 0120 and allows air to flow in the vertical direction; an engaging through hole 0131 which is a receiving part of a cassette type fan 0140 arranged under the air passage 0107; and the cassette type fan 0140 arranged detachably at this engaging through hole 0131.SELECTED DRAWING: Figure 1F

Description

The present invention relates to a heating element cooling structure used to cool a heating element included in a heating element installed on the back surface.

Conventionally, as a heating structure including a heating element installed on the back surface as described above, for example, there is a power regulator that controls the power supplied to the electric furnace.

This power regulator consists of a vertical tubular housing that houses heat sinks such as thyristors, fuses, and snubber circuits, and two power cables (rod-shaped feeders) located below the heat sink in this housing. A pair of terminals to connect to, a heat sink provided between the back and the housing, an air passage that houses this heat sink and allows air to flow in the vertical direction, and an air cooling fan placed at the end of this air passage. I have. The snubber circuit is a protection circuit for preventing malfunction of a thyristor, which is a heating element, and is formed by connecting a resistor and a capacitor in series.

This power regulator is connected to a temperature controller that controls the power supplied to the electric furnace by comparing the actual temperature of the electric furnace with the target temperature, and receives a control signal from this temperature controller to control this. Power according to the signal is supplied to the heater of the electric furnace.

In this power regulator, the heat generated by the heat generators such as thyristors, fuses, and snubber circuits in the housing when supplying power to the electric furnace is absorbed by the heat sink, and inside the air passage warmed by the heat absorbed by this heat sink. The heating element is cooled by sucking out the air from the air with an air cooling fan.

In this power regulator, cables of appropriate thickness are used for the two power cables used to supply power to the electric furnace. Therefore, considering the ease of cable management when connecting the cables, etc. Both or at least one of the two power cables is located below the housing. That is, at least one of the pair of terminals connected to the two power cables is usually arranged below a heating element such as a thyristor. Therefore, the air-cooled fan is often arranged in the surplus space at the upper end of the air passage in consideration of workability at the time of replacement.

However, in a power regulator having such a configuration, the air-cooled fan is constantly exposed to the warm air rising in the air passage and is agitated by heat, so that the grease filled in the bearing of the air-cooled fan easily evaporates. It has the disadvantage of short life.

Further, in the power regulator having the above configuration, when it is installed below a duct such as a wiring pipe, there is a drawback that it becomes difficult to replace the cooling fan due to the existence of the duct.

As a heat generating structure devised to cope with such a defect, for example, there is a power conversion device described in Patent Document 1.
This power conversion device includes a housing containing a heating element, a heat sink attached to the back side of the housing, and a cooling fan. In this power conversion device, the cooling fan is arranged below the heat sink. By adopting a cooling structure, the drawbacks of the above-mentioned power regulator are compensated.

Japanese Patent No. 5344182

However, in consideration of ease of cable routing and the like, the power regulator described above has a configuration in which at least one of the pair of terminals connected to the two power cables is arranged below the housing. If the cooling structure of this power converter is adopted, the life of the cooling fan can be extended, but the cooling fan is located at the back of at least one power cable, so it is necessary to replace the cooling fan as well. There is a problem that maintenance and management of the cooling fan is difficult, and solving this problem has become a conventional problem.

The present invention has been made to solve the above-mentioned conventional problems, and it is necessary to easily replace the cooling fan as well as maintain the cooling fan after extending the life of the cooling fan. It is an object of the present invention to provide a heating element cooling structure capable of providing a cooling structure.

In order to solve the above problems, the present invention provides the following heating element cooling structure.
That is, the first invention in the present invention is a heating element cooling structure that is installed on the back surface and cools the included heating element, and is provided on the heating element and the heating element provided on the front surface on the operation side. A terminal located below the heating element to which the connected control unit, a rod-shaped feeder that supplies the cause of heat to the heating element is connected, a heat sink provided on the back surface of the heating element, and the heat sink are housed and vertically It has an air passage for passing air through the air passage, a receiving portion of the cassette type fan described later, which is arranged below the air passage, and a cassette type fan which is detachably arranged in the receiving portion.

Further, in the second aspect of the present invention, the cassette type fan has a power supply terminal for driving the fan, and the receiving portion electrically connects with the power supply terminal as the cassette type fan is attached / detached. It is configured to have supply terminals that are connected and separated.

Further, the third invention of the present invention includes a rotation state detection unit that detects the rotation state of the cassette type fan and an alarm issuing condition that is a condition for issuing an alarm according to the detection state of the rotation state detection unit. It is configured to further include an alarm issuing condition holding unit to be held and an alarm issuing unit to issue an alarm when the detected rotation state is held and the alarm issuing condition is satisfied.

According to the present invention, in addition to being able to extend the life of the cooling fan, it is possible to easily perform maintenance management of the cooling fan as well as replacement of the cooling fan, which is a very excellent effect. Is obtained.

Front view of a heating element including a heating element for explaining the heating element cooling structure of the first embodiment. Cross-sectional view taken along line XX in FIG. 1A YY line sectional view in FIG. 1A Circuit diagram of the heat generating structure shown in FIGS. 1A to 1C Partial perspective view of the heat sink shown in FIGS. 1A to 1C Overall perspective view of the heat generating structure shown in FIGS. 1A to 1C. FIG. 1 is a configuration explanatory view of an electric furnace control system including a power regulator which is a heat generating structure shown in FIGS. 1A to 1C and F. 1 Partial perspective view for explaining the relationship between the receiving portion of the cassette type fan of the heat generating structure shown in FIGS. 1A to 1F and the cassette type fan detachably arranged in the receiving portion. 1 Overall perspective view of the heat generating structure showing the attachment / detachment state of the cassette type fan to the heat generating structures of FIGS. 1A to 1C and F. Overall perspective view of the heating element including the heating element for explaining the heating element cooling structure of the second embodiment. Partially enlarged view for explaining the relationship between the receiving portion of the cassette type fan of the heat generating structure shown in FIG. 2A and the cassette type fan detachably arranged in the receiving portion. Schematic diagram for explaining the control unit of the heating element having the heating element cooling structure in Embodiment 3.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The present invention should not be limited to these embodiments, and may be implemented in various embodiments without departing from the gist thereof.
<Embodiment 1>
<Overview>

The heating element cooling structure of the present embodiment is a heating element cooling structure included in the heating element installed on the back surface, and the heating element has an air passage that houses a heat sink and allows air to flow in the vertical direction. A cassette type fan is detachably arranged by providing a fan receiving part on the back side of the terminal below the heating element and below the air passage to which the rod-shaped feeder that supplies the cause of heat to the heating element is connected. It is characterized by having done it.
In this way, on the back of the heating element, a fan receiving portion is provided at the bottom of the air passage for accommodating the heat sink, and the cassette type fan is detachably arranged. Therefore, the cooling fan is extended while extending the life of the cooling fan. It has the effect that not only the replacement of the fan but also the maintenance and management of the cooling fan can be easily performed.
<Composition>

The electric power regulator that employs the heating element cooling structure according to the present embodiment is used to control the electric power supplied to the electric furnace.

That is, as shown in FIGS. 1A to 1D, the power regulator 0100 adopting the heating element cooling structure according to the present embodiment includes a vertical tubular housing 0110 arranged with respect to the back surface B and the vertical tubular housing 0110. A heating element such as a thyristor 0101, a fuse 0102, and a snubber circuit 0103 housed in the housing 0110, and a control unit 0115 arranged on the front surface (front surface of FIG. 1A, right side of FIG. 1B) 0111 on the operation side of the housing 0110. A pair of terminals 0104A, which are connected to a vertical tubular heat sink 0120 arranged between the back surface B and the housing 0110, and a pair of terminals 0104A connected via a fuse 0102 or a current converter 0105 below the thyristor 0101 in the housing 0110. The 0104B is provided, and a heating element such as a thyristor 0101 or a fuse 0102 is connected to the control unit 0115, and the snubber circuit 0103 is connected to the thyristor 0101.
The snubber circuit 0103, which is a protection circuit for preventing the malfunction of the thyristor 0101 which is a heating element, is formed by connecting a resistor and a capacitor in series. In this case, the resistance of the snubber circuit 0103 is a heating element.

As partially shown in FIG. 1E, the heat sink 0120 is made of an extruded material of a metal having good heat transfer characteristics, for example, a 6000 series aluminum alloy, and has the same width dimension as the housing 0110. The heat sink 0120 is integrated with the housing 0110 with a large number of heat radiation fins 0121 protruding in a bellows shape toward the inside of the cylinder along the vertical direction, and the housing 0110 and the housing 0110 integrated with each other in this way. The heat sink 0120 is attached to the back surface B via the base plate 0112.

At this time, a large number of heat sinks 0120 are provided on the side covers 0130, 0130 attached to the housing attached to the back surface B side in the lower part of the housing 0110 and the front cover 0106 covering the front side of these side covers 0130, 0130. It is configured to be positioned so that the side surface 123 having the heat radiation groove 122 is exposed. Further, the thyristor 0101, which is a heating element housed in the housing 0110, is directly attached to the heat sink 0120.

That is, in this embodiment, between the back surface B and the housing 0110 by the heat sink 0120 in which the heat radiation fins 0121 are arranged in the vertical direction, the base plate 0112, the side covers 0130 and 0130 attached to the housing, and the front cover 0106. In the above, an air passage 0107 for circulating air in the vertical direction is formed.
In addition, in this embodiment, the upper end of the front cover 0106 constituting the air passage 0107 is bent toward the housing 0110 to provide a gap W between the upper end and the lower end of the heat sink 0120. As a result, as shown by an arrow in FIG. 1C, a part of the cooling air from below sent into the air passage 0107 by the cassette type fan 0140 described in detail later is introduced into the housing 0110 through the gap W, and the thyristor is used. A heating element such as 0101, fuse 0102, or snubber circuit 0103 (particularly, snubber circuit 0103 attached to fuse 0102 or heat sink 0120 not directly attached to heat sink 0120 via resin spacer 0103A) is cooled. There is.

Further, in this embodiment, the pair of terminals 0104A and 0104B located below the heating element such as the thyristor 0101, the fuse 0102, and the snubber circuit 0103 in the housing 0110 have two power supplies as shown in FIG. 1F. One end of each of the cables (rod-shaped feeders) 0108 and 0109 is connected, and the other end of one power cable 0108 is connected to the heater 0181 in the electric furnace 0180 and the other power cable 0109 as shown in FIG. 1G. The other end of the is connected to the power supply D.

The power regulator 0100 is connected to a temperature controller 0190 that controls the power supplied to the electric furnace 0180 by comparing the actual temperature of the electric furnace 0180 measured by the temperature sensor 0182 with the target temperature. The control signal S from the controller 0190 is received by the control unit 0115 arranged on the front surface 0111 of the housing 0110, and the thyristor 0101 supplies the electric power corresponding to the control signal S to the heater 0181 of the electric furnace 0180. ..

Further, the power regulator 0100 has a cassette type fan 0140 arranged at the lower end of the air passage 0107, that is, in an area surrounded by the base plate 0112, the side covers 0130 and 0130 attached to the housing, and the front cover 0106. I have.

This cassette type fan 0140 is a cooling fan that sends air to the air passage 0107, and includes a fan main body 0150 and a frame body 0160. The fan main body 0150 is screwed in a state of being fitted in the frame body 0160. It has been stopped. The fan drive motor of the fan body 0150 employs a DC motor having a long life and easy to detect the rotation speed, while the frame 0160 is made of a thermoplastic resin, for example, polycarbonate. The frame 0160 is formed in a substantially square shape and fits into a fitting area A (shown only in FIG. 1E) surrounded by a base plate 0112, side covers 0130 and 0130 attached to the housing, and a front cover 0106. It is formed to a size.

In this case, as shown in FIG. 1H, a cassette type fan 0140 can be attached to and detached from the side covers 0130 and 0130 (in FIG. 1H, only one side cover 0130 is shown) constituting the lower end of the air passage 0107. Each of the locking through holes (accepting portion) 0131 for attaching to the side cover 0131 is provided, and in this embodiment, the locking through holes 0131 as the receiving portion are provided at two locations at the lower end edge portion of the side cover 0130 at appropriate intervals. Is formed in.

On the other hand, in the cassette type fan 0140, the pair of peripheral walls 0161 and 0161 facing each other of the frame 0160 (only one peripheral wall 0161 is shown in FIG. 1H) is elastically deformed so that the tip portion located on the lower side can be pushed inside the frame. A piece 0162 is provided, and the elastically deformed piece 0162 is formed at two places on the peripheral wall 0161 in accordance with the locking through holes 0131 and 0131 as the receiving portion on the air passage 0107 side.

Then, the frame body 0160 (cassette type fan 0140) is fitted into the fitting region A at the roots of the elastically deformed pieces 0162 and 0162 of the frame body 0160 (in the virtual line of FIG. 1H). In the state shown), locking projections 0163 and 0163 are formed to be locked in the locking through hole 0131 of the side cover 0130, respectively.

In addition, operating grooves 0164 and 0164 are formed at the respective tip portions of the elastically deformed pieces 0162 and 0162 of the frame body 0160 to facilitate pushing the tip portions against the elastic force. These operation grooves 0164, 0164 are recesses 0132, 0132 formed below the locking through hole 0131 of the side cover 0130 in a state where the frame body 0160 (cassette type fan 0140) is fitted in the fitting region A. It is designed to be exposed from each.

Further, guide slopes 0165 and 0165 are formed at both ends of the pair of peripheral walls 0161 and 0161 on which the elastically deformed pieces 0162 of the frame body 0160 are arranged, respectively, and the frame body 0160 (cassette) is formed with respect to the fitting region A. The mold fan 0140) can be inserted smoothly.

Further, guide slopes 0167 and 0167 are also formed at both ends of the pair of peripheral walls 0166 and 0166 on which the elastically deformed pieces 0162 of the frame body 0160 are not arranged, and are fitted in the same manner as the guide slopes 0165 and 0165. The frame body 0160 (cassette type fan 0140) can be smoothly inserted into the area A.

Furthermore, in this embodiment, a DC power supply unit 0170 for a fan (shown only in FIG. 1F) is built in the housing 0110, and when the cassette type fan 0140 is attached to the lower end of the air passage 0107, a motor is used. The side lead wire 0151 and the power supply unit side lead wire 0171 are connected.

That is, in this power regulator 0100, when controlling the power supplied to the heater 0181 of the electric furnace 0180, the heat sink 0120 absorbs the heat generated by the thyristor 0101 directly attached to the heat sink 0120 in the housing 0110. Then, cooling air is sent from below into the air passage 0107 that houses the heat sink 0120 by the cassette type fan 0140, and the air in the air passage 0107 warmed by the heat absorbed by the heat sink 0120 is expelled upward, thereby causing the thyristor 0101. I try to cool it. At this time, the fuse 0102 and the snubber circuit 0103, which are not directly attached to the heat sink 0120, introduce a part of the cooling air sent into the air passage 0107 by the cassette type fan 0140 from the gap W into the housing 0110. , It is cooled together with the thyristor 0101.

In the power regulator 0100 having such a configuration, since the cassette type fan 0140 is arranged at the lower end of the air passage 0107 accommodating the heat sink 0120, the cassette type fan 0140 raises the air passage 0107 to the high temperature air. It will be operated in an atmosphere of, for example, about 55 ° C. without being exposed, and therefore, the life of the cassette type fan 0140 can be extended.

Further, in this embodiment, for example, when replacing or inspecting the cassette type fan 0140, one hand is inserted toward the cassette type fan 0140 through the power cables 0108 and 0109 located below the housing 0110. Then, the tip portions of the elastically deformed pieces 0162 and 0162 of the frame body 0160 are sequentially pushed into the frame against the elastic force to separate the locking projections 0163 and 0163 from the locking through holes 0131 and 0131 (FIG. State shown in 1I).

At this time, operation grooves 0164 and 0164 are formed at the respective tips of the elastically deformed pieces 0162 and 0162, and these operation grooves 0164 and 0164 are located below the locking through hole 0131 of the side cover 0130. It is exposed from the recesses 0132 and 0132 that are located.

Therefore, it is easy to put a finger on each tip of the elastic deformed pieces 0162 and 0162 of the frame body 0160 even by groping, and the operation groove 0164 and 0164 allows the finger to fit to each tip of the elastic deformed piece 0162 and 0162. The pushing operation against the elastic force of each tip of the elastically deformed pieces 0162 and 0162 becomes simple.

Then, in this state, when the cassette type fan 0140 is moved downward and the motor side lead wire 0151 and the power supply unit side lead wire 0171 are separated from each other, the air of the cassette type fan 0140 that needs to be replaced or inspected. It will be removed from the lower end of passage 0107.

On the other hand, when a replacement cassette type fan 0140 is installed in place of the removed cassette type fan 0140, or when the cassette type fan 0140 after inspection is reattached, the side covers 0130, 0130 having the locking through hole 0131 are installed. The pair of peripheral walls 0161 and 0161 on which the elastically deformed piece 0162 of the frame body 0162 of the cassette type fan 0140 is formed are aligned with each other, and the motor side lead wire 0151 and the power supply unit side lead wire 0171 are connected to each other.

Next, while elastically deforming the elastically deformed pieces 0162 and 0162 of the frame body 0160 in the cassette type fan 0140 to the inside of the frame, the cassette type fan 0140 is placed in the fitting region A at the lower end of the air passage 0107 in the direction of the arrow shown in the figure (white in FIG. 1F). Push it in the direction of the arrow) and lock the locking protrusions 0163 and 0163 to the locking through holes 0131 and 0131, respectively, as shown by the virtual line in FIG. 1H, to the lower end of the air passage 0107 of the cassette type fan 0140. Will be installed.

When the cassette type fan 0140 is attached to the lower end of the air passage 0107, guide slopes 0165 and 0165 are formed on the pair of peripheral walls 0161 and 0161 on which the elastically deformed pieces 0162 of the frame body 0160 are arranged. Similarly, since the guide slopes 0167 and 0167 are also formed on the pair of peripheral walls 0166 and 0166 on which the elastically deformed pieces 0162 of the frame body 0160 are not arranged, the frame body 0160 (cassette type fan 0140) with respect to the fitting region A. Can be inserted smoothly.
<Effect>

According to this embodiment, the life of the cassette type fan 0140 can be extended as compared with the conventional technique.
Further, as shown in FIG. 1I, the removal and installation of the cassette type fan 0140 during replacement and maintenance are performed through the power cables 0108 and 0109 located below the housing 0110, but the air passage 0107 Since the cassette type fan 0140 is detachably attached to the lower end portion, not only the cassette type fan 0140 can be replaced but also the maintenance management of the cassette type fan 0140 can be easily performed.
In addition, since the cassette type fan 0140 is detachably arranged at the lower end of the air passage 0107, the cassette type fan 0140 can be replaced and maintained regardless of the presence or absence of ducts such as wiring pipes above the power regulator 0100. It can be easily managed.
<Embodiment 2>
<Overview>

This embodiment is based on the first embodiment, and the cassette type fan is provided with a power supply terminal for driving the fan, while the receiving portion at the lower end of the air passage supplies power to the cassette type fan. The terminal is arranged, and the power terminal of the cassette type fan and the supply terminal of the receiving part of the air passage are electrically connected to each other by the operation of attaching and detaching the cassette type fan to the receiving part of the air passage.
In this way, at the same time as attaching the cassette type fan to the receiving part of the air passage, the cassette type fan and the receiving part of the air passage are electrically connected to each other, and the cassette type fan is removed from the receiving part of the air passage. At the same time, since the cassette type fan and the receiving portion of the air passage are electrically separated from each other, there is an effect that the work of attaching and detaching the cassette type fan to the receiving portion of the air passage becomes easier.
<Composition>

In this embodiment, as shown in FIG. 2A, the difference from the previous embodiment is that the cassette type fan is arranged in the fitting region A at the lower end of the air passage 0207 in the power regulator (heat generating structure) 0200. A fan-side connector (power supply terminal) 0268 for driving the fan is arranged in 0240, and a cover side for connecting to the DC power supply unit 0270 for the fan built in the housing 0210 in the fitting area A of the air passage 0207. The point is that the connector (supply terminal) 0238 is arranged, and other configurations are the same as those of the previous embodiment.

That is, as shown in FIG. 2B, in the present embodiment, the fan-side connector 0268 is provided at the center of one of the peripheral walls 0261 and 0261 having the elastically deformed piece 0262 of the frame body 0260 in the cassette type fan 0240. A cover-side connector 0238 is provided inside the center of one of the side covers 0230 and 0230 attached to the housing, which constitutes the fitting region A of the air passage 0207.

Then, in the present embodiment, as the cassette type fan 0240 is fitted and attached to the fitting region A at the lower end of the air passage 0207 in the power regulator 0200, the fan side connector 0268 and the air on the cassette type fan 0240 side are fitted and attached. The cover-side connector 0238 on the passage 0207 side is fitted to each other and electrically connected.

Further, as the cassette type fan 0240 is removed from the fitting region A at the lower end of the air passage 0207 in the power regulator 0200, both connectors 0238 and 0268 in the mated state are separated from each other, and the electrical connection is established. It is designed to be blocked.

In the present embodiment, for example, when replacing or inspecting the cassette type fan 0240, the tip portions of the elastically deformed pieces 0262 and 0262 of the frame body 0260 are pushed into the frame against the elastic force. The locking projections 0263 and 0263 are separated from the locking through holes 0231 and 0231, respectively.

Then, when the cassette type fan 0240 is moved downward in this state and removed from the fitting area A at the lower end of the air passage 0207, the fan side connector on the cassette type fan 0240 side in the fitted state is accompanied by this. Since the 0268 is separated from the cover-side connector 0238 on the air passage 0207 side, both connectors 0238 and 0268 are electrically cut off from each other. That is, the work of separating the motor-side lead wire 0151 and the power supply unit-side lead wire 0171, which is required in the first embodiment, can be omitted.

On the other hand, when replacing the removed cassette type fan 0240 with a replacement cassette type fan 0240 or reattaching the cassette type fan 0240 after inspection, the cassette is attached to the side cover 0230 having the cover side connector 0238. Align the peripheral wall 0261 where the fan side connector 0268 of the mold fan 0240 is arranged.

Next, while elastically deforming the elastically deformed pieces 0262 and 0262 of the frame body 0260 in the cassette type fan 0240 to the inside of the frame, the cassette type fan 0240 is placed in the fitting region A at the lower end of the air passage 0207 in the direction of the arrow shown in the figure (white in FIG. 2A). Push it in the direction of the arrow) to lock the locking projections 0263 and 0263 to the locking through holes 0231 and 0231, respectively, and attach the cassette type fan 0240 to the lower end of the air passage 0207.

As the cassette type fan 0240 is attached to the lower end of the air passage 0207, the fan side connector 0268 on the cassette type fan 0240 side fits into the cover side connector 0238 on the air passage 0207 side. Both connectors 0238 and 0268 will be electrically connected to each other. That is, the connection work between the motor-side lead wire 0151 and the power supply unit-side lead wire 0171, which is required in the first embodiment, can be omitted.
<Effect>

In the present embodiment, when installing and removing the cassette type fan 0240 to the lower end of the air passage 0207, the work of connecting the motor side lead wire 0151 and the power supply unit side lead wire 0171, which is necessary in the first embodiment, and Since the work of separating the air passages 0207 can be omitted, the work of attaching and detaching the cassette type fan 0240 to the lower end of the air passage 0207 can be performed more easily.
<Embodiment 3>
<Overview>

This embodiment is based on the first embodiment, and has a rotation state detection unit that detects the rotation state of the cassette type fan and an alarm that holds an alarm issuing condition for issuing an alarm according to the detection state by the rotation state detection unit. It further has an issuance condition holding unit and an alarm issuing unit that issues an alarm when the rotation state detected by the rotation state detection unit satisfies the alarm issuing condition held by the alarm issuing condition holding unit. It is a feature.
In this way, the rotation state detection unit constantly detects the rotation state of the cassette type fan, and when the detection state satisfies the alarm issuance condition held by the alarm issuance condition holding unit, the alarm issuance unit issues an alarm. Therefore, for example, if an alarm is issued when the rotation speed of the cassette type fan becomes equal to or less than a predetermined rotation speed, it is possible to notify the replacement time and maintenance time of the cassette type fan. ..
<Composition>

In this embodiment, as shown in FIG. 3, the difference from the first and second embodiments is that the cassette type fan 0340 arranged at the lower end of the air passage 0307 in the power regulator (heat generating structure) 0300 It differs in that the rotation speed signal output unit (rotation state detection unit) 0341 is arranged and that the control unit 0315 has an alarm issuing condition holding unit 0316 and an alarm issuing unit 0317, and other configurations. Is the same as in the previous embodiment.

Here, the DC power supply unit 0370 for the fan is connected to the cassette type fan 0340 in which the rotation speed signal output unit 0341 is arranged via the lead wire 0371, and the rotation speed signal output unit 0341 is a cassette type fan. The pulse signal corresponding to the rotation speed (rotation speed detection state) of 0340 is acquired and sent to the DC power supply unit 0370 for the fan via the lead wire 0342.
On the other hand, the alarm issuing condition holding unit 0316 of the control unit 0315 connected to the DC power supply unit 0370 for the fan holds the alarm issuing condition for issuing an alarm in response to the pulse signal acquired by the rotation speed signal output unit 0341. The alarm issuing unit 0317 issues an alarm when the pulse signal acquired by the rotation speed signal output unit 0341 satisfies the alarm issuing condition held by the alarm issuing condition holding unit 0316.

In the present embodiment, the alarm issuing condition for issuing the alarm held by the alarm issuing condition holding unit 0316 is a guideline for replacing or inspecting the cassette type fan 0340, for example, the fan rotation speed of the cassette type fan 0340 is normal. It means that it drops to 60 to 70% of the rotation speed, and in the alarm issuing unit 0317, the pulse signal of the fan rotation speed acquired and output by the rotation speed signal output unit 0341 drops to 60 to 70% of the normal rotation speed. In that case, an alarm is issued to notify the replacement time or inspection time. The alarm includes, but is not limited to, means such as a siren and an alarm image displayed on the monitor 0318 of the control unit 0315.

In the present embodiment, for example, when the rotation speed signal output unit 0341 detects that the fan rotation speed of the cassette type fan 0340, which is a guideline for replacement or inspection, has dropped to 60 to 70% of the normal rotation speed, the rotation speed is increased. The pulse signal is output to the alarm issuing condition holding unit 0316 of the control unit 0315.

Next, the alarm issuing condition holding unit 0316 of the control unit 0315 receives the pulse signal of the rotation speed from the rotation speed signal output unit 0341, and then the alarm issuing condition holding unit 0316 of the control unit 0315 receives the alarm issuing condition holding unit 0316. It is determined whether or not the rotation speed signal from the rotation speed signal output unit 0341 satisfies the alarm issuing condition for issuing the alarm.

Then, when the alarm issuing unit 0317 of the control unit 0315 determines that the pulse signal of the rotation speed from the rotation speed signal output unit 0341 satisfies the alarm issuing condition, the alarm image is displayed on the siren or the monitor 0318 of the control unit 0315. Etc. is issued to notify the replacement time or inspection time.

In the present embodiment, when the alarm is issued by the alarm issuing unit 0317 of the control unit 0315, the replacement time or the inspection time of the cassette type fan 0340 can be known, so that the cassette type fan 0340 suddenly stops. The occurrence of the situation will be avoided.

Further, also in the present embodiment, since the cassette type fan 0340 is operated in an atmosphere of, for example, about 55 ° C. without being exposed to the high temperature air rising in the air passage 0307, the rotation speed signal as the rotation state detection unit is used. Even if the output unit 0341 is, for example, an IC chip, it is possible to prevent malfunction due to heat.
<Effect>

According to this embodiment, it is possible to avoid a sudden stop of the cassette type fan 0340, and by extension, a sudden stop of the operation of the power regulator 0300 itself.

0100, 0200, 0300 Power regulator (heat generating structure)
0101 Thyristor (heating element)
0102 Fuse (heating element)
0103 Snubber circuit (heating element)
0104A, 0104B Pair of terminals 0107, 0207, 0307 Air passage 0108, 0109 Power cable (rod-shaped feeder)
0110, 0210 Housing 0115, 0315 Control unit 0120 Heat sink 0131 Locking through hole (accepting unit)
0140, 0240, 0340 Cassette type fan 0163 Locking protrusion 0238 Cover side connector (supply terminal)
0268 Fan side connector (power supply terminal)
0316 Alarm issuing condition holding unit 0317 Alarm issuing unit 0341 Rotation speed signal output unit (rotation state detection unit)
B back

Claims (3)

It is a heating element cooling structure that is installed against the back and cools the included heating element.
With a heating element
A control unit connected to the heating element provided on the front surface on the operation side, and
A terminal located below the heating element to which a rod-shaped feeder that supplies the cause of heat to the heating element is connected.
A heat sink provided on the back surface of the heating element and
An air passage that houses the heat sink and allows air to flow in the vertical direction,
The receiving part of the cassette type fan, which will be described later, located below the air passage,
A cassette type fan that is detachably arranged in the receiving part,
Heating element cooling structure with. The cassette type fan has a power supply terminal for driving the fan.
The heating element cooling structure according to claim 1, wherein the receiving portion has a supply terminal that is electrically connected to and separated from the power supply terminal as the cassette type fan is attached and detached. A rotation state detection unit that detects the rotation state of the cassette type fan,
An alarm issuing condition holding unit that holds an alarm issuing condition, which is a condition for issuing an alarm according to the detection state of the rotation state detecting unit,
An alarm issuing unit that issues an alarm when the detected rotation state is maintained and the alarm issuing condition is satisfied.
The heating element cooling structure according to claim 1 or 2, further comprising.

Images