JP3082669B2 - Cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box housing a heating element such as an electronic component, and more particularly to a cooling device suitable for cooling the inside of a closed box.

[0002]

2. Description of the Related Art In order to prevent malfunctions due to adhesion of dust, dust, moisture, etc., electronic parts using semiconductors are sometimes used by being housed in a closed box, for example, a housing. . In this case, since the electronic components and the like are heating elements, it is necessary to cool the inside of the housing, but it is not possible to directly cool the housing by blowing outside air. Therefore, the inside of the housing is cooled by exchanging heat between high-temperature air inside the housing and low-temperature air (outside air) outside the housing using a heat exchanger such as a heat pipe. The device is considered.

[0003]

The cooling device having such a structure includes an internal blower for circulating and blowing the high-temperature air in the housing to the heat-receiving portion of the heat exchanger, and a cooling device for the heat-radiating portion of the heat exchanger. An external air blower that blows outside air is provided, and a temperature sensor that detects the temperature of high-temperature air in the housing is provided. Each of the internal blower and the external blower includes a fan and a motor.

[0004] In the above-mentioned cooling device, usually, the inside of the housing is cooled by continuously energizing and driving the motors of the internal blower and the external blower. When the temperature of the outside air drops and the temperature detected by the temperature sensor becomes 0 ° C. or less, the motor of the external blower is cut off. Thereby, cooling is performed so that the temperature inside the housing is maintained at, for example, about 0 to 65 ° C.

[0005] However, in the cooling device having the above configuration, usually,
Since the configuration is such that the motors of the internal blower and the external blower are continuously energized, there is a problem that the power consumption is considerably increased, and it is necessary to improve the energy saving.

[0006] Accordingly, it is an object of the present invention, sealed Howe
An object of the present invention is to provide a cooling device capable of sufficiently cooling the inside of a jing (for example, a box) and reducing power consumption.

[0007]

According to the first aspect of the present invention,
Is a hot fluid (eg, hot air) in a sealed housing.
Flows through the first fluid passage and is outside the housing.
Low temperature fluid (for example, outside air) flows through the second fluid passage
It is configured as follows. Then, the high-temperature flow is controlled by the control means.
Fluid generation of the first fluid generating means based on the detected temperature of the body
Variable control of the output and the fluid generation output of the second fluid generation means
It is supposed to be. Further, the temperature is controlled by the control means.
When the detection temperature detected by the temperature detection means increases,
Each fluid generation of the first fluid generation means and the second fluid generation means
It is controlled so that the raw output increases. In the case of this configuration, for example, when the detected temperature of the high-temperature fluid in the housing is low, even if the fluid generation output of the first fluid generation unit and the fluid generation output of the second fluid generation unit are lower than normal , Can be maintained within the set temperature range. Therefore, according to the cooling device of the first aspect, the inside of the sealed housing (for example, a box) can be sufficiently cooled, and the fluid generation output of each fluid generation means is appropriately reduced, so that the consumption is reduced. The power can be reduced.

According to the second aspect of the present invention, since the first fluid generating means and the second fluid generating means are independently controlled, the temperature of the high temperature air (high temperature fluid) in the box is set. While maintaining the temperature within the temperature range, it is possible to further reduce the fluid generation output of the first fluid generation unit and the fluid generation output of the second fluid generation unit. Therefore, power consumption can be further reduced.

According to the third aspect of the present invention, the first fluid generating means and the second fluid generating means can be easily realized with a simple configuration. According to the invention of claim 4,
Since the rotation speed of the first motor and the rotation speed of the second motor are variably controlled, it is possible to easily variably control the fluid generation outputs of the first and second fluid generation means, respectively. Further, according to the invention of claim 5, the first
Since the rotation speed of the second motor and the rotation speed of the second motor are variably controlled stepwise, the configuration for realizing the variable control is simplified.

According to the sixth aspect of the invention, the threshold value for variable control is configured to be different between the case where the detected temperature rises and the case where the detected temperature falls, so that the rotational speed of the first motor and Frequent fluctuation of the rotation speed of the second motor can be prevented. Thereby, the variable control of the rotation speeds of both motors can be executed stably.

According to the seventh aspect of the present invention, an alarm signal indicating the determined driving abnormality is transmitted to the outside.
An abnormality in the operation of the cooling device can be easily and easily recognized outside, for example, in a remote place. This enables the maintenance worker to quickly execute a countermeasure against the operation abnormality. According to the invention of claim 8, when the temperature detected by the temperature detecting means exceeds the maximum temperature for abnormality determination,
Alternatively, when the control means itself breaks down, the first motor and the second motor are configured to be driven at the rated output, so that even if an operation abnormality of the cooling device occurs,
It is possible to cool the inside of the closed box.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a boiling cooling device will be described below with reference to the drawings.
First, FIG. 2 is a diagram showing a schematic overall configuration of an electronic device incorporating the boiling cooling device of the present embodiment. In FIG. 2, an electronic device 1 is a wireless base station device of a mobile wireless telephone such as a mobile phone or a car phone. This electronic device 1
Is composed of, for example, a housing 2 which is a closed box, electronic components 3 and 4 housed in the housing 2, and a boiling cooling device 5 incorporated in the housing 2 at the left end in FIG. Have been.

The housing 2 is composed of a housing that keeps the inside airtight. The electronic components 3 and 4 are made of a semiconductor device (eg, a transistor, a thyristor, an IGBT).
And the like, and is a heating element that generates heat when energized and driven.

The boiling cooling device 5 is composed of, for example, a box-shaped metal casing 6 as a device main body, and a fluid that partitions the interior of the casing 6 into a first fluid passage 7 and a second fluid passage 8. A separator 9, a heat exchanger 10 disposed so as to penetrate the fluid separator 9, and two internal fan devices 11 and 12 disposed below the heat exchanger 10 (FIG. 3 also) ), A heater 13 disposed above the internal fan devices 11 and 12, and two external fan devices 14 and 15 disposed above the heat exchanger 10.

As shown in FIG. 3, a suction port 16a for sucking air in the housing 2 is formed on an upper side of the rear wall portion 16 of the casing 6, and the suction port 16a is It is composed of a rectangular opening. Further, on the lower side of the rear wall portion 16 of the casing 6, two air outlets 16b and 16c for returning (blowing) the air in the first fluid passage 7 into the housing 2 are formed. The outlets 16b and 16c are each formed of a rectangular opening. Also, the internal fan device 1
Reference numerals 1 and 12 include, for example, internal fans 11a and 12a composed of, for example, sirocco fans (centrifugal multi-blade fans), and motors 11b and 12b composed of, for example, DC brushless motors for rotating these internal fans 11a and 12a. .

In this configuration, when the motors 11b and 12b are energized and driven, the internal fans 11a and 12a are driven to rotate, and the air blowing action causes the air in the housing 2 (that is, high-temperature air; (Corresponding to a high-temperature fluid) is sucked from the suction port 16a and passes through the first fluid passage 7. The air in the first fluid passage 7 is configured to be guided by the fan casing 17 and the duct 18 and then blown out from the outlets 16 b and 16 c into the housing 2. Thereby, the air in the housing 2 circulates through the first fluid passage 7.

The air circulation path (housing 2)
And the first fluid passage 7) is hermetically partitioned from the inside to the outside. In the case of this configuration, the internal fan devices 11 and 12
Constitute a first fluid generating means for flowing a high-temperature fluid through the first fluid passage 7. When the high-temperature air in the housing 2 passes through the first fluid passage 7, this air is cooled by the heat exchanger 10 as described later in detail.

On the other hand, as shown in FIG. 4, a suction port 19a for sucking outside air is formed in an intermediate portion of the front wall 19 of the casing 6, and the suction port 19a has a rectangular opening. The louver 20 is attached to the section.
Further, at the upper end of the front wall 19 of the casing 6, there is provided an outlet 19 for blowing out the air in the second fluid passage 8 to the outside.
The air outlet 19b is formed by attaching a louver 21 to a rectangular opening. The louvers 20, 21 are for preventing raindrops or the like from entering. The external fan devices 14 and 15 include, for example, external fans 14a and 15a composed of sirocco fans (centrifugal multi-blade fans), and these external fans 14a and 15a.
The motors 14b and 15b, which are, for example, DC brushless motors for rotating the motor a.

In this configuration, when the motors 14b and 15b are energized and driven, the external fans 14a and 15a are rotated and driven by the blowing action of the external fans (ie, low-temperature air, which corresponds to the low-temperature fluid of the present invention). ) Is the suction port 19
a to be passed through the second fluid passage 8. The air in the second fluid passage 8 is configured to be guided by the fan casing 22 and the duct 23 and then blown out from the outlet 19b to the outside.
Thus, the outside air flows through the second fluid passage 8.

In the case of this configuration, the external fan devices 14, 1
5 constitutes second fluid generating means for flowing the low-temperature fluid through the second fluid passage 8. When the outside air passes through the second fluid passage 8, the outside air is configured to receive heat from the heat exchanger 10 (that is, radiate heat from the heat exchanger 10) (details will be described later). . In the case where the casing 6 of the boiling cooling device 5 is attached to a door forming a part of the housing 2 of the electronic device 1, an opening formed corresponding to the suction port 19a and the air outlet 19b in the door. For example, a gasket (not shown) made of, for example, neoprene rubber is arranged between the peripheral edge of the suction port 19a and the peripheral edge of the outlet 19b so as to prevent air leakage.

Further, a lower portion (the motor 11) in the casing 6 is provided.
2 and 3, a controller 24 for controlling the overall operation of the evaporative cooling device 5 is provided, and drivers 25 and 26 for controlling the energization of the motors 11b and 12b are provided below. It is arranged. Further, in the upper part (side of the motors 14b and 15b) in the casing 6, drivers 27 and 28 for controlling the energization of the motors 14b and 15b are provided.
Are arranged. The controller 24 and the drivers 25 to 28 will be described later in detail.

A thermistor 29, for example, is disposed below the opening edge of the suction port 16a in the rear wall 16 of the casing 6 as temperature detecting means. The thermistor 29 has a function of detecting the temperature of the air (high-temperature air) flowing through the first fluid passage 7, that is, the temperature inside the housing 2, and providing this temperature detection signal to the controller 24.

On the other hand, the heat exchanger 10 comprises a multistage (for example, three-stage) boiling heat exchanger 30 attached to the fluid separator 9 so as to penetrate the fluid separator 9. The fluid separator 9 is made of a metal plate having good thermal conductivity, such as aluminum, and has a plurality of through holes for penetrating and supporting the boiling heat exchanger 30. The fluid separator 9 is attached to the casing 6 by, for example, brazing.

The boiling heat exchanger 30 is a thermosiphon type heat exchanger, and includes a heat receiving portion 31 disposed so as to protrude toward the first fluid passage 7 and a heat receiving portion 31 arranged on the second fluid passage 8. And a first connecting pipe 33 and a second connecting pipe 34 that connect the heat receiving section 31 and the heat radiating section 32 to form a closed loop for refrigerant circulation. Have been. The refrigerant enclosed in the boiling heat exchanger 30 is, for example, HFC-134a (an alternative chlorofluorocarbon-free Freon).

As shown in FIGS. 5 and 6, the heat receiving portion 31 includes a plurality of heat absorbing tubes 35 arranged substantially in parallel, and a lower communicating portion 36 for connecting the lower end portions of the heat absorbing tubes 35 to each other.
And an upper communicating portion 37 for communicating and connecting the upper end portion of the heat absorbing tube 35.
It is composed of The heat absorbing tube 35 is formed of a flat tube formed of a metal material having good heat conductivity (for example, aluminum or copper) so as to have an elongated rectangular or oval cross section. In this case, the refrigerant is sealed in the heat receiving section 31 to such an extent that the liquid level of the refrigerant is located at the upper end of the heat absorbing tube 35. In the heat receiving section 31, the heat absorbing tube 35 is configured to receive heat from the high-temperature air to evaporate the internal liquid refrigerant, and the heat receiving section 31 forms a refrigerant boiling section.

On the other hand, the heat dissipating portion 32 includes a plurality of heat dissipating tubes 38 arranged substantially in parallel, a lower communication portion 39 for connecting the lower ends of the heat dissipating tubes 38 to each other, and a communication connection for the upper end of the heat dissipating tubes 38. And an upper communicating portion 40. The radiator tube 38 is a flat tube formed of a metal material having good thermal conductivity (for example, aluminum or copper) so as to have an elongated rectangular or oval cross section. In the heat radiating portion 32, the heat radiating tube 38 is configured to emit heat to the low-temperature air to condense and liquefy the gas refrigerant therein, and the heat radiating tube 38 forms a refrigerant condensing portion.

A heat receiving fin 41 is provided between the heat absorbing tubes 35 of the heat absorbing portion 31, and a heat radiating fin 42 is provided between the heat radiating tubes 38 of the heat radiating portion 32. The heat receiving fins 41 and the heat radiating fins 42 are corrugated fins formed by alternately turning thin plates of a metal material having good thermal conductivity (eg, aluminum or copper) into a wave shape. Each of the fins 41 and 42 is joined to the flat outer surfaces of the heat absorbing tube 35 and the heat radiating tube 38 by, for example, brazing.

Further, the first connecting pipe 33 is a pipe having a substantially circular cross section, and connects the upper communicating part 37 of the heat absorbing part 31 and the upper communicating part 40 of the heat radiating part 32 so as to communicate with each other. The first connection pipe 33 has a function of guiding the refrigerant vapor boiling and vaporized in the heat absorbing section 31 into the heat radiating section 32. The second connecting pipe 34 is a pipe having a substantially circular cross section, and connects the lower communicating part 39 of the heat radiating part 32 and the lower communicating part 36 of the heat absorbing part 31 so as to communicate with each other. The second connecting pipe 34 has a function of guiding the liquid refrigerant condensed and liquefied by the heat radiating section 32 into the heat absorbing section 31.

Therefore, in the heat exchanger 10, the liquid refrigerant in the heat absorbing tube 35 of the heat absorbing section 31 is supplied to the first fluid passage 7.
From the high-temperature air flowing through the fin 41 through the heat receiving fins 41 to be vaporized. The vaporized refrigerant is supplied to the radiator 32
, And condensed and liquefied therein, and the condensed latent heat is transmitted (radiated) to the low-temperature air flowing through the second fluid passage 8 via the radiation fins 42. Then, the liquefied refrigerant drops into the lower communication part 36 of the heat absorbing part 31. Due to the repetition of the boiling liquefaction of the refrigerant, the high-temperature air (high-temperature fluid) in the housing 2 of the electronic device 1 and the low-temperature air (low-temperature fluid) as the outside air do not mix, and heat is transferred from the high-temperature air to the low-temperature air. It is configured to be moved efficiently.

Next, the electrical configuration of the evaporative cooling device 5 and the portion of the electrical configuration of the electronic device 1 related to the ebullient cooling device 5 will be described with reference to FIG. In FIG. 1, an electronic device 1 includes an AC power supply circuit 43 that outputs 220 V AC and a DC power supply circuit 44 that outputs 26 V DC.
And an alarm signal input unit 45. The AC power supply lines 46 and 47 and the ground wire 48 derived from the AC power supply circuit 43 are connected to the controller 24 of the evaporative cooling device 5 via the terminal portions 49a and 49b.

The AC power supply lines 46 and 47 and the ground line 48 also provided in the controller 24 are connected to the heater 13 via terminal portions 49c and 49d. The AC power supply line 46 in the controller 24 is provided with a 20 A fuse 50, a heater relay contact 51, and a current sensor 52 including a CT or the like. The heater 13 and the temperature fuse 53 are connected in series between the AC power supply lines 46 and 47, and the ground line 48 is connected to the heater 1
3 is connected to the ground terminal 13a. In addition, heater 1
3 is, for example, 186 V to 264 V, 47 Hz to 63 Hz
The heater is operated by an AC power supply of 1. The output is, for example, 1.
5 kW.

The heater relay contact 51 is configured to be turned on and off by a control unit 54 provided in the controller 24. In this case, the control unit 54 turns on and off the relay contact 51 for the heater by turning off the relay coil of the relay for the heater. Thereby, the control unit 54 is configured to control the power cutoff of the heater 13. The control unit 54 includes a logic circuit including a logic element and a comparator, a constant voltage circuit 55, an LED circuit 56 for displaying an operation abnormality, and the like. The control unit 54 has a function of controlling the overall operation of the boiling cooling device 5.

Further, the control unit 54 is configured to receive a current detection signal detected by the current sensor 52. Thereby, the control unit 54 is configured to be able to determine whether a current is flowing through the heater 13, that is, whether the heater 13 is out of order. Further, the control unit 54
Is configured to receive the temperature detection signal detected by the thermistor 29 via the terminals 49e and 49f. Thereby, the control unit 54 controls the first fluid passage 7
Of the air flowing through the housing, ie, the housing 2 of the electronic device 1
It is configured to be able to detect the temperature inside.

A positive power supply line 57, a negative power supply line 58, and a ground line 59 derived from the DC power supply circuit 44 of the electronic device 1.
Is connected to the constant voltage circuit 55 of the control section 54 of the controller 24 via the terminal sections 49g and 49h. The constant voltage circuit 55 is a circuit that receives a DC voltage of 26 V, converts the DC voltage to a DC constant voltage (for example, 12 V) for the control unit, and supplies the voltage to the control unit. The positive power supply line 57
Is provided between the terminal 49h and the constant voltage circuit 55, for example, a 2A fuse 60 is provided.

Further, two communication lines 61 and 62 derived from the alarm signal input section 45 of the electronic device 1 are connected to the terminal section 49.
i and 49j are connected to an alarm relay contact 63 provided in the controller 24. The alarm relay contact 63 is configured to be turned on and off by the control unit 54 of the controller 24. In this case, the control unit 54 is configured to turn on and off the alarm relay contact 63 by turning off the relay coil of the alarm relay. Then, the alarm signal input unit 45 of the electronic device 1
Can recognize the on / off state of the alarm relay contact 63 via the communication lines 61 and 62. For example, when the alarm relay contact 63 is in the on state, it indicates that the operation is abnormal, The off state indicates normal operation.

The alarm relay contact 63 is a normally closed relay which turns off when energized and turns on when power is cut off. Therefore, during normal operation, the control unit 54 energizes the relay coil of the alarm relay to turn off the alarm relay contact 63, and turns off the relay coil when an abnormal operation is determined as described later in detail. Then, the alarm relay contact 63 is turned on. Thus, when the power to the alarm relay is cut off for some reason, the relay coil is cut off and the alarm relay contact 63 is turned on to indicate an abnormal operation (that is, an abnormal operation).
It has a so-called fail-safe configuration).

Further, a positive power supply line 57, a negative power supply line 58, and a ground line 59 derived from the DC power supply circuit 44 of the electronic device 1
Is branched at a portion between the terminal portion 49g and the terminal portion 49h, and the driver 25 (and the remaining 3
Drivers 26, 27, 28). In this case, FIG.
Motor 11 of the internal fan device 11 driven by the motor
b, and the illustration of the remaining drivers 26, 27, 28 and motors 12b, 14b, 15b is omitted. Drivers 26, 27, 28 (not shown)
Each configuration of the motors 12b, 14b, and 15b is substantially the same as the configuration of the driver 25 and the motor 11b.
Hereinafter, the configurations of the driver 25 and the motor 11b will be specifically described.

First, the driver 25 is connected via the terminal 49k.
An inverter unit 64 is connected between the positive power supply line 57 and the negative power supply line 58 disposed therein. As is well known, the inverter unit 64 includes six switching elements 6.
4a are connected by a bridge, and three phases (U phase,
(V phase, W phase) output lines 65a, 65b, 65c are derived. These three-phase output lines 65a, 65b, 65c
Is connected to the motor 1 via the terminal portion 49l and the motor terminal portion 66.
1b are connected to the three-phase windings 67a, 67b, 67c. In this case, the motor 11b has a rating of 3
It is a phase DC brushless motor. The motor 11b is provided with a rotation detection sensor 68 for detecting the rotation angle (rotation position) of the rotor. This rotation detection sensor 68
Is composed of, for example, three Hall elements (Hall ICs), and is configured to output a rotation angle detection signal. Each switching element 64 of the inverter unit 64
A is connected to a freewheel diode (not shown).

Each switching element 64a of the inverter section 64 is configured to be turned on and off by a control section 69 provided in the driver 25.
The control unit 69 includes a logic circuit including a logic element, a comparator, and the like, and a constant voltage circuit 70. The control unit 69 is connected to the control unit 54 of the controller 24 via the terminal units 49m and 49n, and is configured to receive a rotation speed command signal from the control unit 54. The control section 69 is connected to the rotation detection sensor 68 via the terminal section 49m and the motor terminal section 66, and is configured to receive a rotation detection signal from the rotation detection sensor 68.

The control section 69 generates a control signal for controlling on / off of each switching element 64a of the inverter section 64 based on the rotation speed command signal and the rotation detection signal. By turning on and off the element 64a, the motor 11b
Of the windings 67a to 67c. Thereby, the control unit 69 is configured to be able to rotate the motor 11b at the rotation speed commanded by the controller 24. Further, the control unit 69 detects the rotation speed of the motor 11b based on the rotation detection signal and, when detecting that the detected speed is, for example, 20% or more lower than the commanded rotation speed, It is determined that the motor is abnormal (fan failure), and a motor abnormal signal indicating the abnormality is sent to the control unit 5 of the controller 24 via a connection line connecting the terminal units 49m and 49n.
4 is transmitted.

The negative power supply line 58 provided in the driver 25 is provided with a current sensor 71 made of, for example, a resistor.
It is connected to the. Thus, the control unit 69 is configured to be able to detect the load current flowing through the motor 11b by detecting the voltage between both terminals of the current sensor 71.

The constant voltage circuit 70 of the control unit 69 includes a positive power supply line 57, a negative power supply line 58,
This circuit is connected to a ground wire 59, receives a DC voltage of 26V, converts it into a DC constant voltage (for example, 12V) for the control unit 69, and supplies this voltage to the control unit 69. The positive power supply line 57 provided in the driver 25 is provided with, for example, a 7-A fuse 72.

Next, the operation of the above configuration, in particular, the internal fan devices 11 and 12 of the boiling cooling device 5 and the external fan device 1
The operation of the heaters 4, 15 and the heater 13 will be described with reference to FIG. The boiling cooling device 5 of this embodiment is configured to operate under the following environmental conditions. That is, the environmental temperature is from -40C to + 46C. The relative humidity is 5
% To 95%, except above 27 ° C., where the relative humidity is limited to a saturation humidity of 0.024 pounds of water per pound of dry air. Atmospheric pressure corresponds to altitudes between -200 feet and 10,000 feet. DC power supply is 19VDC-30VDC (rated 26VDC)
It is. AC power supply is 186VAC-264VAC, 4
7 Hz to 63 Hz (220 VAC rating). The boiling cooling device 5 can maintain the temperature in the housing 2 within a temperature range of 0 ° C. to 65 ° C. under the condition that the heat generated by the electronic components 3 and 4 in the electronic device 1 is MAX 2700 W. It is configured as follows.

First, the operation of the internal fan devices 11, 12 will be described with reference to FIG. The control unit 54 of the controller 24 receives the temperature detection signal from the thermistor 29, and receives the temperature of the air flowing through the first fluid passage 7,
That is, the temperature inside the housing 2 is detected, and if the detected temperature is equal to or higher than T2 (for example, 40 ° C.), the internal fan device 1
A rotation speed command signal for rotating the motors 11b and 12b at the rated rotation speed (ie, 100%) is given to each control unit 69 of the drivers 25 and 26. As a result, the drivers 25 and 26 control the power supply (feedback control) so that the motors 11 b and 12 b rotate at the rated rotation speed, and thus the motors 11 and 12 of the internal fan devices 11 and 12
b and 12b are rotated at the rated rotation speed.

Thereafter, when the temperature in the housing 2 decreases to T1 (for example, 35 ° C.) while the motors 11b and 12b of the internal fan devices 11 and 12 are rotating at the rated rotation speed, the controller 24 The controller 54 supplies a rotation speed command signal for rotating the motors 11b and 12b of the internal fan devices 11 and 12 at 50% of the rated rotation speed to the control units 69 of the drivers 25 and 26. As a result, the drivers 25 and 26 control the energization so that the motors 11b and 12b rotate at 50% of the rated rotation speed, so that the motors 11b and 12b of the internal fan devices 11 and 12 rotate at 50% of the rated rotation speed. Will be done.

Thereafter, while the motors 11b and 12b of the internal fan devices 11 and 12 are rotating at 50% of the rated rotation speed, the temperature in the housing 2 rises and T2 (4
0 ° C), the motors 11b, 12b
The rotation speed is switched so that is rotated at the rated rotation speed. The motors 11 of the internal fan devices 11 and 12
When the temperature inside the housing 2 decreases to reach T1 (35 ° C.) in a state where the motors b and 12b are rotating at the rated rotation speed, at that time, the motors 11b and 12b are driven at 50% of the rated rotation speed. The rotation speed is switched so as to rotate. Hereinafter, as described above, the motors 11b and 1b of the internal fan devices 11 and 12 corresponding to the temperature inside the housing 2 will be described.
The configuration is such that the switching control of the rotation speed of 2b is repeatedly executed.

On the other hand, the driving operation of the external fan devices 14 and 15 is executed in a control manner as shown in FIG.
Specifically, the control unit 54 of the controller 24 receives the temperature detection signal from the thermistor 29, detects the temperature of the air flowing in the first fluid passage 7, that is, the temperature in the housing 2, and detects the temperature. If the temperature is equal to or higher than T4 (for example, 55 ° C.), the motors 14b, 1b of the external fan devices 14, 15
A rotation speed command signal for rotating 5b at the rated rotation speed (100%) is given to each control unit 69 of the drivers 27 and 28. As a result, the drivers 27 and 28
b, 15b are controlled so as to rotate at the rated rotation speed, and the motors 14b,
15b is rotated at the rated rotation speed.

Thereafter, when the temperature in the housing 2 decreases to T3 (for example, 50 ° C.), the control unit 54 of the controller 24 causes the motors 14b and
A rotation speed command signal for rotating the motor 15b at 50% of the rated rotation speed is supplied to the control units 69 of the drivers 27 and 28.
As a result, the drivers 27 and 28 connect the motors 14b and 1
5b is rotated at 50% of the rated rotation speed, so that the motors 14 of the external fan devices 14, 15 are controlled.
b and 15b are rotated at 50% of the rated rotation speed.

Further, when the motors 14b and 15b of the external fan devices 14 and 15 are rotated at 50% of the rated rotation speed, the temperature in the housing 2 becomes T5 (for example, 35%).
° C), the controller 54 of the controller 24
Are the motors 14b, 15b of the external fan devices 14, 15
(Ie, 0% of the rated rotation speed) is given to each control unit 69 of the drivers 27 and 28.
As a result, the drivers 27 and 28 connect the motors 14b and 1
5b, the external fan devices 14, 15 are stopped.

On the other hand, when the temperature in the housing 2 rises and reaches T6 (for example, 40 ° C.) while the motors 14b and 15b of the external fan devices 14 and 15 are stopped,
At that time, the control unit 54 of the controller 24 provides a rotation speed command signal for rotating the motors 14b, 15b of the external fan devices 14, 15 at 50% of the rated rotation speed to the control units 69 of the drivers 27, 28. Thus, the drivers 27 and 28 switch the rotation speeds so that the motors 14b and 15b rotate at 50% of the rated rotation speed. Then, the motors 14b, 15b of the external fan devices 14, 15
When the temperature inside the housing 2 rises and reaches T4 (for example, 55 ° C.) in a state where is rotated at 50% of the rated rotation speed, the control unit 54 of the controller 24 at that time.
Are the motors 14b, 15b of the external fan devices 14, 15
Is supplied to the control units 69 of the drivers 27 and 28 to rotate the motor at the rated rotation speed. Thus, the drivers 27 and 28 switch the rotation speeds so that the motors 14b and 15b rotate at the rated rotation speed (100%). Hereinafter, as described above, the motors 14b, 1 of the external fan devices 14, 15 corresponding to the temperature inside the housing 2
The switching control of the rotation speed of 5b is configured to be repeatedly executed.

Next, the operation of the heater 13 will be described with reference to FIG. When the outside environmental temperature is low, the temperature inside the housing 2 is also low. Therefore, in order to maintain the internal temperature of the housing 2 at 0 ° C. or higher, the heater 13 is energized to drive the first
The air passing through the fluid passage 7 is heated to prevent the temperature inside the housing 2 from dropping below 0 ° C.

More specifically, as shown in FIG. 7C, when the temperature in the housing 2 drops and reaches Ta (for example, 5 ° C.), the controller 54 of the controller 24 at that point.
Turns on the heater relay contact 51 to energize and drive the heater 13. The temperature inside the housing 2 is Ta (5 ° C.).
As long as the following is true, the heater 13 is on. Then, when the temperature in the housing 2 rises and reaches Tb (for example, 10 ° C.) with the heater 13 turned on, the controller 54 of the controller 24 at that time.
Turns off the relay contact 51 for the heater and cuts off the power of the heater 13. Note that the heater 13 is turned off as long as the temperature in the housing 2 is equal to or higher than Tb (10 ° C.). Hereinafter, as described above, the power cutoff control of the heater 13 according to the temperature in the housing 2 is configured to be repeatedly executed.

Next, the control contents of the controller 24 when the operation abnormality occurs in the ebullient cooling device 5 will be described. First, for some reason, the fan devices 11, 12, 1
When the rotation speeds of the motors 11b, 12b, 14b, and 15b of the motors 4 and 15 become slower than the commanded rotation speed by, for example, 20% or more, the control units 69 of the drivers 25 to 28 detect the abnormality and detect the abnormality. Motor failure (fan failure)
Is determined, and a motor abnormality signal indicating that fact is transmitted to the control unit 54 of the controller 24. Then, the control unit 54 of the controller 24 is configured to turn off the alarm relay contact 63 and turn on the LED for fan failure display provided inside the LED circuit 56. The LEDs for displaying the fan failure include motors 11b, 12b of the fan devices 11, 12, 14, and 15,
As you can see which of 14b and 15b has failed,
4 corresponding to each motor 11b, 12b, 14b, 15b
LEDs are provided.

When the alarm relay contact 63 is turned off, the alarm signal input section 4 of the electronic device 1 is turned off.
5 recognizes that an operation abnormality has occurred in the boiling cooling device 5. In this case, the controller 5 of the controller 24
4 is configured to transmit an abnormality signal indicating an operation abnormality to the electronic device 1 by turning off the alarm relay contact 63. When the electronic device 1 recognizes the above-mentioned operation abnormality, the electronic device 1 is configured to transmit the notification to, for example, a maintenance worker located at a remote place. by this,
The maintenance worker can repair the boiling cooling device 5 in which the operation abnormality has occurred.

At this time, the maintenance worker determines which LED of the LED circuit 56 of the controller 24 is lit from an inspection port (not shown) provided at the lower portion of the front surface of the casing 6 of the boiling cooling device 5. Is configured to be visible. Thereby, the fan devices 11, 1
2, 14, 15 motors 11b, 12b, 14b, 15
It can be determined which of b has failed.

Next, a case where the heater 13 has failed will be described. Since the control unit 54 of the controller 24 can determine whether or not the heater current is flowing based on the current detection signal from the current sensor 52, if the heater current is not flowing, it determines that a heater failure (heater disconnection) has occurred. It is configured as follows. When it is determined that a heater failure has occurred, the control unit 54 is configured to turn off the alarm relay contact 63 and turn on an LED for heater failure display provided inside the LED circuit 56.

The operation control when the temperature inside the housing 2 of the electronic device 1 comes out of the set temperature range, that is, when the internal temperature becomes abnormal will be described.
In this case, when the control unit 54 of the controller 24 detects that the temperature in the housing 2 has become, for example, 70 ° C. or higher based on the temperature detection signal from the thermistor 29, the control unit 54 sets the alarm relay contact 63 to In addition to turning off the LED, a high-temperature abnormality display LED provided inside the LED circuit 56 is turned on. Further, when detecting that the temperature in the housing 2 has become, for example, 0 ° C. or less, the control unit 54 turns off the alarm relay contact 63 and displays a low-temperature abnormality display provided inside the LED circuit 56. It is configured to turn on the LED.

In the case of the above configuration, the LED circuit 56
Are provided with LEDs for individually displaying the above-mentioned various operation abnormalities. Therefore, the maintenance worker can use the LED of the controller 24 through the inspection port of the casing 6 of the boiling cooling device 5.
By visually recognizing which LED of the circuit 56 is lit, the type of the operation abnormality can be easily recognized.

In this embodiment, when the temperature in the housing 2 becomes 70 ° C. or higher,
4 fails, the motors 11 b, 12 b, 1 of the internal fan devices 11, 12 and the external fan devices 14, 15
4b and 15b are configured to be driven to rotate at the rated rotation speed. This control is configured to be controlled by the control unit 54 of the controller 24 or each control unit 69 of the drivers 25 to 28. This makes it possible to lower the temperature inside the housing 2 as much as possible,
The reliability and safety of the system are improved. Note that the controller 24 may fail if the controller 5
4 does not output the speed command for commanding the rotation speed of the motors 11b, 12b, 14b, 15b, or the connection line connecting the control unit 54 of the controller 24 and the control unit 69 of the drivers 25 to 28 is broken. Or the connection line or the like connecting the thermistor 29 and the control unit 54 of the controller 24 is broken.

According to the present embodiment having such a configuration, the internal fan devices 11 and 12 and the external fan device 1 are based on the temperature inside the housing 2 detected by the thermistor 29.
Since the rotation speeds of the motors 11b, 12b, 14b, and 15b of 4, 15 are configured to be variably controlled in a stepwise manner, while maintaining the temperature in the housing 2 within the set temperature range,
The rotation speed (ie, output) of the motors 11b, 12b, 14b, 15b can be reduced as much as possible. Therefore, power consumption can be reduced as compared with the conventional configuration.

In the above embodiment, the internal fan device 1
Although the rotational speeds of the motors 11b and 12b are variablely controlled in two stages, and the rotational speeds of the motors 14b and 15b of the external fan devices 14 and 15 are variably controlled in three stages. The rotation speed of the motors 11b and 12b of the internal fan devices 11 and 12 is not
It can be variably controlled more than stages, and the external fan devices 14 and 15
The rotation speed of the motors 14b and 15b is variably controlled in two or four or more stages, or each of the motors 11b and
The rotation speeds of 2b, 14b, and 15b may be linearly variably controlled.

In the above embodiment, the drivers 25 to 2
8 are controlled by the current sensor 71 to control the motor 11.
b, 12b, 14b, and 15b are configured to detect and monitor the load current flowing therethrough. Therefore, when it is detected that the magnitude of the load current is somewhat larger than that during normal operation,
When it is detected to be small to some extent, the alarm relay contacts are turned off and the L for displaying each operation abnormality is displayed.
The ED may be turned on. Further, in the above embodiment, the motors 11b, 12b, 14b, 15b
Although the motor is constituted by a brushless motor, the motor is not limited to this, and may be constituted by another motor as long as the motor has a variable rotation speed.

On the other hand, in the above embodiment, the air is circulated in the housing 2 and the first fluid passage 7, but instead, the liquid such as oil or water is circulated. May be. In this case, the internal fan device 1
It is preferable that an internal pump is provided instead of 1 and 12. Furthermore, although air (outside air) is configured to flow through the outside and the inside of the second fluid passage 8, a liquid such as oil or water may be configured to flow instead. In this case, it is preferable to provide an external pump instead of the external fan devices 14 and 15.

In the above embodiment, the boiling heat exchanger 30 is used as the heat exchanger 10, but a so-called heat pipe may be used instead. Furthermore, in the above-described embodiment, the occurrence of an operation abnormality is transmitted to the electronic device 1 (alarm signal input unit 45) by turning the alarm relay contact 63 on and off. An abnormal signal for discriminating (specifying) the type may be transmitted to the electronic device 1 (alarm signal input unit 45). With such a configuration, the type of the operation abnormality can be known on the electronic device 1 side, so that the electronic device 1 can also cope with the type of the operation abnormality. Specifically, when it is notified that the fan devices 11, 12, 14, 15 have failed, the electronic device 1 controls the electronic components 3 and 4 to reduce the amount of heat generated, or It is possible to control the operation of the electronic components 3 and 4 to be completely stopped.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram showing one embodiment of the present invention.

FIG. 2 is a longitudinal side view of a configuration in which a boiling cooling device is incorporated in an electronic device.

FIG. 3 is a rear view of the boiling cooling device.

FIG. 4 is a front view of a boiling cooling device.

FIG. 5 is a front view of a boiling heat exchanger.

FIG. 6 is a longitudinal sectional front view showing a schematic configuration of a boiling heat exchanger.

7A is a diagram illustrating a relationship between a rotation speed of a motor of an internal fan device and a temperature in a housing, and FIG. 7B is a diagram illustrating a relationship between a rotation speed of a motor of the external fan device and a temperature in a housing. FIG. 2C is a diagram showing the relationship between the heater on / off and the temperature inside the housing.

[Explanation of symbols]

1 is an electronic device, 2 is a housing, 5 is a boiling cooling device, 6
Is a casing (apparatus main body), 7 is a first fluid passage, 8 is a second fluid passage, 9 is a fluid separator, 10 is a heat exchanger, 1
1 is an internal fan device (first fluid generating means), 11b is a motor, 12 is an internal fan device (first fluid generating means), 12b is a motor, 13 is a heater, and 14 is an external fan device (second fluid generating device). Generating means), 14b is a motor, 15
Is an external fan device (second fluid generating means), 15b is a motor, 16a is a suction port, 16b is an outlet, 16c is an outlet, 20 is a louver, 21 is a louver, 24 is a controller (control means), 25, 26, 27 and 28 are drivers, 29 is a thermistor (temperature detecting means), 30 is a boiling heat exchanger, 31 is a heat receiving section, 32 is a heat radiating section, 35 is a heat absorbing pipe, 38 is a heat radiating pipe, 41 is a heat receiving fin, 42 is a radiation fin, 45 is an alarm signal input unit, 51 is a relay contact for a heater, 54 is a control unit, 56 is an LED circuit, 63 is a relay contact for alarm, 64 is an inverter unit, 68 is a rotation detection sensor, and 69 is a control. Reference numeral 71 denotes a current sensor.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28F 27/00 511 F28D 15/02 H01L 23/46 H05K 7/20

Claims (11)

(57) [Claims] 1. An apparatus body, the inside of which is separated by a fluid separator between a first fluid passage and a second fluid passage; and the first fluid passage is provided so as to penetrate the fluid separator. A heat exchanger that receives heat from a high-temperature fluid flowing through the second fluid passage and radiates the heat to a low-temperature fluid flowing through the second fluid passage; a first fluid generation unit that causes the high-temperature fluid to flow through the first fluid passage; A second fluid generation unit that allows a low-temperature fluid to flow through the second fluid passage; a temperature detection unit that detects a temperature of the high-temperature fluid flowing through the first fluid passage; and a temperature detection unit that detects a temperature detected by the temperature detection unit. Control means for variably controlling the fluid generation output of the first fluid generation means and the fluid generation output of the second fluid generation means, and a heating element for generating heat when energized and driven inside. And it is virtually sealed The first fluid passage is configured to suck the high-temperature fluid in the housing from one end thereof and discharge the high-temperature fluid into the housing from the other end, and the second fluid The passage is configured to suck a low-temperature fluid outside the housing from one end thereof and discharge the low-temperature fluid outside the housing from the other end, and the control unit detects the detected temperature detected by the temperature detection unit. A cooling device that controls so that each fluid generation output of the first fluid generation means and the second fluid generation means increases when the pressure rises. 2. The cooling device according to claim 1, wherein said control means is configured to independently control said first fluid generation means and said second fluid generation means. 3. The first fluid generating means includes a first fan and a first motor that drives the first fan to rotate, and the second fluid generating means includes a first fan and a second motor. 3. The cooling device according to claim 1, further comprising a second fan and a second motor that drives the second fan to rotate. 4. The cooling device according to claim 3, wherein said control means is configured to variably control a rotation speed of said first motor and a rotation speed of said second motor. 5. The apparatus according to claim 4, wherein the control means is configured to variably control the rotation speed of the first motor and the rotation speed of the second motor in a stepwise manner. Cooling system. 6. The variable control device according to claim 1, wherein the control unit controls the rotation speed of the first motor and the rotation speed of the second motor stepwise based on the temperature detected by the temperature detection unit. 6. The cooling device according to claim 5, wherein the threshold value is different between a case where the detected temperature rises and a case where the detected temperature falls. 7. The control device according to claim 1, wherein the control means has a function of determining an abnormality in the operation state and a function of transmitting an alarm signal indicating the determined operation abnormality to the outside. Item 7. The cooling device according to any one of Items 1 to 6. 8. The first motor and the second motor when the temperature detected by the temperature detecting means exceeds a maximum temperature for abnormality determination or when the control means itself breaks down. The cooling device according to any one of claims 3 to 7, wherein the cooling device is configured to drive the motor at a rated output. 9. The first fluid generating means and the second fluid generating means.
The fluid generating means is composed of a fan device, respectively.
And the rotation speed of each fan device is variably controlled in multiple stages
And the temperature detected by the temperature detecting means is increased.
The first fluid generating means and the second fluid generating means
That the rotational speed of each stage is configured to increase
The cooling device according to claim 1, wherein: 10. The rotation speed of said first fluid generating means.
Is variably controlled to 100% of the rated speed or intermediate speed
And the rotation speed of the second fluid generating means is equal to the rated rotation speed.
Variable control to 100%, intermediate speed or 0% of rated speed
And the temperature detected by the temperature detecting means is equal to or lower than a predetermined temperature.
When it is above, the rotational speed before Symbol first fluid generating means
Becomes 100% of the rated rotation speed, and the second flow
The rotation speed of the body generating means is controlled to be an intermediate speed.
The cooling device according to claim 9, wherein: 11. The first fluid is provided inside by a fluid separator.
An apparatus main body separated by a passage and a second fluid passage, and disposed so as to penetrate the fluid separator;
Receives heat from the high temperature fluid flowing through the fluid passage and
A heat exchanger that radiates heat to a low-temperature fluid flowing through the second fluid passage; and a first fluid that allows the high-temperature fluid to flow through the first fluid passage.
Generating means and a second fluid for flowing a low-temperature fluid through the second fluid passage
Generating means for detecting the temperature of the high-temperature fluid flowing through the first fluid passage
A temperature detecting means for detecting a temperature based on the temperature detected by the temperature detecting means;
The fluid generation output of the first fluid generation means and the second flow
Control means for variably controlling the fluid generation output of the body generation means.
Wherein the control means, said first fluid generating means and the second
Are configured to independently control the fluid generation means of the
A cooling device.