JP2012183893A - Defogger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a defogger that uses a small quantity of electricity, even if it is used for glass of a back door or a rear door of an electric vehicle.SOLUTION: The defogger includes: an air blowing device 11 for sending air in the electric vehicle to the door glass; a dehumidifier 12 for dehumidifying water in the air sent by the air blowing device 11; a heating device 13 for heating a part of the air sent to the dehumidifier for removing water adhered to a part of the dehumidifying agent included in the dehumidifier 12; and a heat exchanger for exchanging heat of a heated air including the removed water. The heated air heated by the heating device 13 passes through a part of the dehumidifier 12, and water adhered to the part of the dehumidifier 12 is removed. The heated air containing the removed water passes through the heat exchanger, while air in the vehicle passes through a part other than the part of the dehumidifier 12 by the air blowing device 11, and then, passed through the heat exchanger. The heated air in the vehicle is blown to the door glass to defog the door glass.

Description

  The present invention relates to an antifogging device for preventing fogging of resin glass of an electric vehicle.

  An anti-fogging device is attached to the glass or windshield of the back door of an automobile. As shown in FIG. 4, the electric heating device 2 is usually attached to the back door glass 1. However, when the back door glass 1 is made of resin, it is difficult to attach the electric heating device 2. Further, the anti-fogging of the windshield is performed by blowing wind with a blower. The air from the air blower uses air that is heated or cooled by air conditioning, and moisture is removed by air conditioning.

  By the way, when performing anti-fogging of the glass of the door which a person gets on and off, since the said electric heating apparatus 2 sticks a heating wire on glass, there exists a possibility of obstructing a visual field. In addition, when using a blower, it is necessary to distribute air from the air conditioner to each door. In particular, in a door on the rear seat side (rear door) of a 4-door or 5-door type vehicle, the device becomes too large. .

  On the other hand, an antifogging device described in Patent Document 1 is known. This device is a device for removing water in the air using a dehumidifying agent instead of air conditioning and blowing the air from which the water has been removed onto the door glass.

  In this case, when water accumulates in the dehumidifying agent, the dehumidifying effect is lowered. As a countermeasure against this, a method of applying heated air to a part of the dehumidifying agent and removing the water in this part is used. It is possible to maintain the dehumidifying effect of the dehumidifying agent by removing a part of the water of the dehumidifying agent.

JP-A-2005-164134

  By the way, it is conceivable to use the antifogging device of Patent Document 1 for the antifogging of the glass of the back door and rear door of an electric vehicle. However, in an electric vehicle, in order to secure a traveling distance as much as possible, it is required to reduce the amount of electricity used for purposes other than traveling. In the anti-fogging device of Patent Document 1, a large amount of electricity is used for a blower for blowing air in a vehicle onto a door glass via a dehumidifier and a heating device for heating a part of the air.

  Therefore, an object of the present invention is to obtain an anti-fogging device that can be mounted on an electric vehicle with a small amount of electricity even when used for a glass of a back door or a rear door of the electric vehicle.

  The present invention is an anti-fogging device for preventing fogging of a door glass of an electric vehicle, a blower for sending air inside the electric vehicle to the door glass, and dehumidification for removing moisture of the air sent out by the blower In order to desorb water adsorbed to a part of the dehumidifying agent contained in the dehumidifier, the heater has a heater for heating a part of the air sent to the dehumidifier and desorbed. Water having a heat exchanger for exchanging heat of heated air containing water, the heated air heated by the heater being passed through a part of the dehumidifier, and water adhering to a part of the dehumidifier The heated air containing the desorbed water is passed through the heat exchanger, and the air inside the vehicle is passed through the part other than the part of the dehumidifier by the blower, and then the heat exchanger By passing the heat of the heated air through this vehicle Transferred to the air, by blowing the heated interior air to the door glass, the use of anti-fog device and performs fogging of the door glass is had to solve the problems.

  Since the heated air that passes through a part of the dehumidifier and desorbs and holds the water attached to a part of the dehumidifier is passed through the heat exchanger, the heat of the heated air is passed through the same heat exchanger. The air that has been subjected to this heat can be used as the air that is blown onto the glass. In this case, since the temperature of the air sprayed on the glass becomes higher, the ability to remove water from the door glass becomes higher, the frequency of movement of the anti-fogging device can be lowered, and it can contribute to power saving.

  Also, the heated air used to remove some moisture from the dehumidifier can be obtained by heating the air inside the vehicle with a heating device, and this air inside the vehicle should use the anti-fogging device of the present invention. Therefore, the amount of heating can be gradually reduced by using the anti-fogging device of the present invention, which can contribute to power saving.

  From these, the anti-fogging device of this invention can reduce the usage-amount of electricity, and can be used for an electric vehicle.

The schematic diagram which shows the mechanism of the anti-fogging device concerning this invention The perspective view which shows the detail of the anti-fogging apparatus of FIG. A perspective view showing an example of a heat exchanger Front view showing an example of a conventional anti-fogging device

  An anti-fogging device according to the present invention is a device for preventing fogging of a door glass of an electric vehicle. In addition, in this specification, door glass means the glass of four doors of a four-door car, or the glass of three or five doors of a three-door car or a five-door car. Further, the back door glass refers to the glass of the back door of a 3-door car or a 5-door car, and the rear door refers to the glass of the rear seat door of a 4-door car or a 5-door car.

  As shown in FIGS. 1 and 2, this apparatus has a blower 11 for sending air inside the electric vehicle to the door glass 15, and a dehumidifier 12 for removing moisture from the air sent by the blower 11. And in order to desorb the water adsorb | sucking to a part of dehumidifier contained in the said dehumidifier 12, while having the heater 13 which heats a part of air sent to the dehumidifier 12, from the dehumidifier 12 It has a heat exchanger 14 for exchanging heat of the heated air containing the desorbed water.

The blower 11 (11a, 11b) is a device for sending the air (in-vehicle air) a in the vehicle to the door glass 15, particularly the back door glass and the rear door glass via the dehumidifier 12.
The blower 11 is preferably a sirocco fan.

  The dehumidifier 12 is for removing moisture from the in-vehicle air a sent from the blower 11a to obtain dehumidified in-vehicle air a ', and includes a dehumidifying agent therein. Examples of the dehumidifying agent include zeolite, silica gel, activated carbon, and alumina. Among these, zeolite that regenerates heat absorbed at 60 ° C. to 80 ° C. is particularly preferable.

  The heater 13 is for heating a part of the in-vehicle air a sent from the blower 11b to be heated air b. When this heated air b is passed through a part of the dehumidifier 12, the water of the dehumidifying agent in the dehumidifier 12 can be desorbed. The heated air that has passed through the dehumidifier 12 becomes humidified heated air b 'containing the separated water. As the heater 13, a heating wire or the like can be used.

  The dehumidifier 12 can be rotated by driving a motor. The dehumidifying agent that has adsorbed moisture in the vehicle interior air a is sent to the regeneration side portion through which the heated air b is passed by the rotation of the dehumidifier 12. On the regeneration side, moisture is removed by the heated air b. For this reason, the dehumidifying agent in the dehumidifier 12 results in moisture absorption and dehumidification almost uniformly.

The heat exchanger 14 performs heat exchange between the dehumidifying vehicle air a ′ and the humidified heating air b ′, and transfers the heat of the humidified heating air b ′ to the dehumidifying vehicle air a ′. it can.
As such a heat exchanger, a plate fin type heat exchanger as shown in FIG. 3 can be used.

Next, the antifogging method of the door glass 15 using the antifogging apparatus concerning this invention is demonstrated.
This anti-fogging device is a device that is provided in the interior of an electric vehicle, particularly in a door portion, and blows air onto the door glass 15.

  First, the blower 11b passes a part of the vehicle interior air a through the heater 13 to obtain the heated air b, then passes through the part of the dehumidifier 12 and then adheres to a part of the dehumidifier 12 The humidified heated air b ′ is obtained by desorbing the water and adding it to the heated air b.

  On the other hand, by the blower 11a, the in-vehicle air a is passed through a portion other than the part of the dehumidifier 12 to obtain dehumidified vehicle air a 'from which moisture has been removed.

  Next, by passing the humidified heated air b 'and the dehumidified vehicle air a' through the heat exchanger 14, the heat of the humidified heated air b 'can be transferred to the dehumidified vehicle air a'. As a result, the humidified air b ″ in which heat is reduced from the humidified heated air b ′ and the heated dehumidified air a ″ in which heat is applied to the dehumidified vehicle interior air a ′ are obtained. The heated dehumidified air a ″ has a high temperature and a low moisture content. Therefore, it is possible to prevent the door glass 15 from being fogged by blowing it onto the door glass 15 through the guide 17. Become.

  By the way, by passing the heated air b through a part of the dehumidifier 12, water adhering to a part of the dehumidifier of the dehumidifier 12 is desorbed. Thereby, water content can be reduced as the whole dehumidifying agent, and the fall of the dehumidifying capability of a dehumidifying agent can be prevented.

  The humidified air b ″ is discharged to the outside via the exhaust pipe 16. Thereby, a part of the water adhering to the dehumidifying agent 12 can be discharged outside the vehicle. In order to prevent the backflow of air, an exhaust valve may be provided at the exhaust port 18 which is the outlet of the air outlet.

  Further, the heated dehumidified air a ″ sprayed on the door glass is then diffused into the vehicle. For this reason, the vehicle interior temperature slightly rises due to the heating by the heater 13. Then, it is used in the present invention. The temperature of the vehicle interior air a rises, and as a result, the temperature of the heated dehumidified air a "is further increased, the moisture absorption capacity of the heated dehumidified air a" is further increased, and the antifogging effect is further improved. Can do.

The increased amount of heat of the heated dehumidified air a ″ to which heat has been applied by the heat exchanger is preferably 30% or more, more preferably 50% or more of the amount of heat of the heated air b to which heat has been applied by the heater 13. If it is less than 30%, the heat exchange amount and the heat loss of the blowing loss become equal, which is inefficient.
On the other hand, the upper limit of the heat quantity is preferably 70%. Above that, it is necessary to reduce the speed of the air passing through the heat exchanger, and the anti-fogging efficiency is not sufficient. To increase the heat exchange efficiency, the size of the heat exchanger can be increased or the air volume can be reduced.

  As shown in FIG. 1, the anti-fogging device according to the present invention is attached below the door glass 15 inside the door. At this time, the heated dehumidified air a ″ is blown to the door glass 15 via the outlet, but the outlet of the heat exchanger 14 and the door glass 15 are close in terms of thermal efficiency. In particular, it is more preferable that the outlet is adjacent to the door glass, specifically, the distance between the outlet of the heat exchanger 14 and the door glass 15 is preferably 10 to 30 cm. On the other hand, if it is too far, the thermal efficiency decreases.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

The evaluation of anti-fogging performance is as follows.
A 1000 mm × 500 mm × 5 mm resin glass (Mitsubishi Gas Chemical Co., Ltd. Iupilon sheet) is left in a low temperature bath at −10 ° C. for 1 hour, and immediately after taking out, it is placed in a constant temperature and humidity bath at 20 ° C. and 50%. . Then, each apparatus was operated for 3 minutes and it was judged whether it was fogging visually.

Example 1
As the anti-fogging device, the device shown in FIGS. 1 and 2 was used. The heat exchanger used is a plate fin type with 200 mm width × 150 mm height × 70 mm thickness and 6 layers.
The door glass and the outlet of the heat exchanger were separated by 30 cm.
As the blower 11, a sirocco fan was used, and as the dehumidifier 12, a dehumidifier 12 carrying a zeolite adsorbent (AQSOA-Z01 manufactured by Mitsubishi Plastics, Inc.) was used.
The air volume was 10 m ³ / h on both the dehumidifying side and the heating side.
The dehumidifier 12 rotates 40 times per hour by driving the motor. Moreover, the heater 13 is a 50 W heating wire, whereby the vehicle interior air a becomes heated air b heated to 80 ° C.
As the heat exchanger, a plate and fin type heat exchanger shown in FIG. 2 was used. The ratio of the area of the surface through which the air a ′ in the dehumidifying vehicle of the heat exchanger passes and the area of the surface through which the humidified heating air b ′ passes is a ′ / b ′, which is 2.
The increased heat quantity of the heated dehumidified air a ″ was 55% of the heat quantity of the heated air b to which heat was applied by the heater 13.
The antifogging performance in this case was evaluated. The results are shown in Table 1.

(Comparative Example 1)
As shown in FIG. 4, heat rays were attached to the resin glass at intervals of 30 mm. And the electric current of 12V and 25A was sent to the hot wire.
The antifogging performance in this case was evaluated. The results are shown in Table 1.

(Comparative Example 2)
Except not using a heat exchanger, the apparatus similar to Example 1 was used and the anti-fogging performance was evaluated. The results are shown in Table 1.

DESCRIPTION OF SYMBOLS 1 Back door glass 2 Electric heating apparatus 11, 11a, 11b Blower 12 Dehumidifier 13 Heater 14 Heat exchanger 15 Door glass 16 Exhaust piping 17 Guide 18 Exhaust port a Car interior air a 'Dehumidification interior air a "Heating dehumidification air b Heating air b 'humidified heated air b "humidified air

Claims (4)

An anti-fogging device for anti-fogging of the door glass of an electric vehicle,
A blower for sending air inside the electric vehicle to the door glass, and a dehumidifier that removes moisture from the air sent out by the blower,
In order to desorb the water adsorbed on a part of the dehumidifying agent contained in the dehumidifier, the heater has a heater for heating a part of the air sent to the dehumidifier and also contains the desorbed water. A heat exchanger for exchanging heat of air,
Heated air heated by the heater is passed through a part of the dehumidifier to desorb water adhering to a part of the dehumidifier,
The heated air containing the desorbed water is passed through the heat exchanger,
By passing the air inside the vehicle by the blower through a portion other than the part of the dehumidifier, and then passing through a heat exchanger, the heat of the heated air is transferred to the air inside the vehicle,
An anti-fogging device for preventing fogging of the door glass by blowing the heated vehicle air on the door glass.   The anti-fogging device according to claim 1, wherein the dehumidifying agent is zeolite.   The anti-fogging device according to claim 1 or 2, wherein an increased amount of heat of the air heated by the heat exchanger is 30 to 70% of a heat amount of the air heated by the heater. The antifogging device according to any one of claims 1 to 3, wherein the door glass is at least one door glass of a rear door and a back door.

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