JPH08798Y2 - Cooling dehumidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cooling and dehumidifying device provided with a thermoelectric module exhibiting a Peltier effect.

[Conventional technology]

As a cooling device that cools the inside of a closed cabinet such as a control panel so that the built-in electrical components and equipment operate normally within the allowable temperature range, a thermoelectric module is used to generate heat on the heat absorbing and heat generating surfaces. There is a type in which a heat sink having excellent conductivity is joined, and a fan is used for cooling and intake and exhaust of heat radiation. There is also a heat exchanger that uses heat pipes and aluminum fins.

[Problems to be solved by the device]

However, even if it has the function of suppressing the temperature rise inside the housing, in order to dehumidify it in order to protect electrical components from rusting and insulation deterioration, in the conventional cooling device, the air taken in falls below the dew point temperature. Since it has not reached the point where it is lowered to condense the moisture in the air to cause condensation on the cooling body, a separate dehumidifying device must be installed. This leads to securing an installation space for the housing and increasing costs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling / dehumidifying device that can cool and dehumidify a sealed enclosure such as a control panel using a thermoelectric module having the Peltier effect.

[Means for solving the problem]

The cooling and dehumidifying device of the present invention has an opening in the wall of a hermetically sealed housing, a radiator for closing the opening, a cooling and dehumidifying chamber inside the housing, and a radiator for the outside. , A thermoelectric module is provided in each of the two regions in the cooling / dehumidifying chamber, each heat-generating surface is fixed to the heat-dissipating body surface, a cooling body is fixed to the heat-absorbing surface, and an exhaust port is provided in the cooling / dehumidifying chamber. An intake port is provided in each of the portions facing the area where the thermoelectric module is provided, and the opening cross-sectional area of one of the intake ports is made smaller than the opening cross-sectional area of the other intake port, so that the heat radiation chamber has intake air. It is characterized by having a mouth, an exhaust port and a fan.

[Action]

When the fan and the thermoelectric module are energized, the air introduced into the cooling and dehumidifying chamber from the intake ports of the cooling and dehumidifying chamber by the fan exchanges heat with the respective cooling bodies that are cooled by the endothermic action of each thermoelectric module. ,
Both become lower than the intake temperature and are discharged into the housing through the exhaust port.

At this time, since the intake port for ventilating the cooling body of one thermoelectric module for dehumidification has a smaller opening cross-sectional area than the other intake port, the intake resistance is different from that of the other intake port. Larger than the air introduced from. Therefore, the amount of air introduced into the cooling body for dehumidification is less than the amount of air introduced from the other intake port, and the surface temperature of the cooling body easily lowers to the dew point temperature while exchanging heat with the surrounding air. Water in the air is condensed on the surface of the body. In addition,
It is known that the oxidative corrosion of metal becomes remarkable when the humidity is 60% RH or more, so the internal humidity of the target sealed enclosure is 60%.
It is desirable to set the heat exchange conditions between the cooling body and the introduced air so that the temperature can be maintained below RH.

On the other hand, the intake port for ventilating the cooling body of the other thermoelectric module for the purpose of cooling has a larger opening cross-sectional area than the intake port for the purpose of dehumidification. Is supplied to. Therefore, the endothermic action of the cooling body is aimed at cooling a large amount of new air, and the surface temperature drop of the cooling body becomes small, which makes it difficult for the condition to cause dew condensation.

Therefore, from the exhaust port, a large amount of air that has cooled to a temperature lower than the intake air temperature by exchanging heat with the cooling body for cooling, and the cooling body for dehumidification removes moisture in the air to reduce the humidity. Further, a small amount of air is discharged into the inside of the housing, the temperature rise inside the housing is suppressed, and the atmosphere becomes low humidity.

Further, the heat generated on the heat generating surface of each thermoelectric module is dissipated through the radiator to the outside air drawn into the radiator chamber from the intake port by the fan, and the outside air is discharged from the outlet port to the outside of the radiator chamber, that is, outside the housing.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

An opening 2 provided in a side wall 1a of a closed casing 1 such as a control panel
A heat radiator 3 having a larger area than that is disposed in the portion so as to close the opening 2, and is fixed to the outer surface of the side wall 1a. The heat radiator 3 has a large number of heat radiation fins 3a on the surface facing the outside of the housing 1. A heat radiating side casing 5 that covers the heat radiating body 3 and forms a heat radiating chamber 4 is provided. The heat radiating side casing 5 is provided with exhaust ports 6 on its upper and lower walls, and an intake port 7 is provided substantially at the center of the side wall facing the heat radiating body 3. A fan 8 is provided inside the opening.

The heat generating surfaces of a pair of thermoelectric modules 9 and 10 are vertically spaced apart from each other on the inner surface of the housing 1 of the radiator 3, and the heat absorbing surfaces are fixed to the cooling bodies 11 and 12, respectively. Cooling body 1
1 and 12 have a large number of cooling fins 11a and 12a. The upper thermoelectric module 9 and the cooling body 11 are for the purpose of cooling as described later, and the lower thermoelectric module 10 and the cooling body 11 are for cooling.
12 is for dehumidification. Inside the housing 1 of the radiator 3, the thermoelectric modules 9 and 10 and the cooling bodies 11 and 1 are arranged.
A cooling side casing (14) is provided which covers (2) and forms a cooling / dehumidifying chamber (13). The upper wall of this cooling side casing 14 has an intake port
15, an exhaust port 16 is provided between the upper and lower thermoelectric modules 9 and 10 on the side wall facing the radiator 3, and an intake port is provided on the side wall facing the lower part of the cooling body 12 of the lower thermoelectric module 10.
17 are provided. A fan 18 is provided inside the exhaust port 16. The opening cross-sectional area of the intake port 17 on the lower cooling body 12 side is set to 1/2 or less of that of the intake port 15 on the upper cooling body 11 side. The lower end of the cooling side casing 14 below the cooling body 12 of the lower thermoelectric module 10 constitutes a water receiver 19.
The drainage pipe 20 is connected to a drainage port projecting from the lower surface thereof, and the drainage pipe 20 penetrates the side wall 1 a of the housing 1 and extends to the outside of the housing 1. Reference numeral 21 denotes an air guide member, which is fixed to the surface of the radiator 3 between the two cooling bodies 11 and 12 and faces the fan 18, and the outer surface thereof has a smooth arc shape upward and downward from the projecting tip. It is composed of a pair of concave curved surfaces and a horizontal surface connecting the upper and lower ends to the surface of the radiator 3, and the horizontal surface has substantially the same thickness as the thermoelectric modules 9 and 10.

 The operation will be described below.

When the thermoelectric modules 9 and 10 and the fans 8 and 18 are energized by a drive power source (not shown), the cooling bodies 11 and 12 in the cooling and dehumidifying chamber 13 are
Is cooled by the endothermic action of the thermoelectric modules 9, 10.
Further, the internal air heated by a heat source such as electric components (not shown) contained in the housing 1 is introduced into the cooling / dehumidifying chamber 13 from the intake ports 15 and 17 by the fan 18, and the intake air above The air sucked from the port 15 is cooled by the upper cooling body 11, and the air sucked from the lower suction port 17 is dehumidified by the lower cooling body 12, and both are discharged from the exhaust port 16 into the housing 1. .

At this time, the amount of new air introduced to the upper cooling body 11 side becomes larger than that of the new air introduced to the lower cooling body 12 side due to the difference in the opening cross-sectional areas of the intake ports 15 and 17, and the upper cooling body The surface temperature of 11 does not almost reach the dew point temperature except high humidity conditions, and cools the air to a temperature lower than the intake temperature. On the other hand, since a small amount of new air is introduced to the lower cooling body 12 side, the surface temperature of the cooling body 12 reaches the dew point temperature while exchanging heat with the surrounding air, and the moisture in the air is condensed on the surface. Condensation attached to the surface of the cooling body 12 falls on the water receiver 19 and is drained to the outside of the housing 1 through the drain pipe 20.

In this way, the air cooled by the upper cooling body 11 is guided by the air guide member 21 and discharged from the exhaust port 16 into the housing 1, and the air dehumidified by the lower cooling body 12 is also guided. The casing 1 is guided from the member 21 through the exhaust port 16
Discharge inside.

In addition, the heat generated on the heat generating surface of each thermoelectric module 9 and 10 passes through the radiator 3 and is fed from the intake port 7 to the radiation chamber 4 by the fan 8.
The heat is dissipated into the outside air sucked in, and the outside air is discharged from the exhaust port 6 to the outside of the heat radiation chamber 4, that is, the outside of the housing 1.

By repeating the above, the temperature rise in the housing 1 is suppressed,
The internal humidity is reduced to the target humidity.

It should be noted that if a water guide hole penetrating vertically is provided in the air guide member 21, it is convenient when the humidity is extremely high and dew condensation occurs on the upper cooling body 11.

[Effect of device]

As described above, according to the present invention, by using the thermoelectric module, it is possible to suppress the temperature rise in the closed casing, reduce the internal humidity, and prevent dew condensation and rusting. Moreover, it can be realized without taking up space.

[Brief description of drawings]

The drawings are longitudinal sectional views showing an embodiment of the present invention. 1 is a closed casing, 1a is a side wall, 2 is an opening, 3 is a radiator, 4 is a radiator chamber, 5 is a casing on the radiator side, 6, 16 are exhaust ports, 7, 15, 1
7 is an intake port, 8 and 18 are fans, 9 and 10 are thermoelectric modules, 1
1, 12 are cooling bodies, 13 are cooling and dehumidifying chambers, 14 is a cooling side casing, 19 is a water receiver, 20 is a drain pipe, and 21 is an air guide member.

Continuation of the front page (56) References Actual flat 4-46593 (JP, U) Actual flat 2-82045 (JP, U) Actual flat 1-163425 (JP, U) Actual flat 1-163426 (JP , U) Actually open 63-128785 (JP, U) Actually open 61-59394 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An opening is provided in a wall portion of a closed casing,
A radiator for closing the opening is provided, a cooling / dehumidifying chamber is provided inside the housing of the radiator, a radiating chamber is provided outside the radiator, and thermoelectric modules are respectively provided in two regions of the cooling / dehumidifying chamber. The cooling body is fixed to the heat sink surface while fixing the heat sink surface, and the cooling and dehumidifying chamber is provided with an exhaust port and a fan, and an intake port is provided in a portion facing the region in which the thermoelectric module is disposed. A cooling / dehumidifying device characterized in that an opening cross-sectional area of one intake port is smaller than an opening cross-sectional area of the other intake port, and the heat radiation chamber is provided with an intake port, an exhaust port and a fan.