JP3395571B2 - Electric hot water circulation system for automobiles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for air-conditioning the interior of a vehicle, and in particular, in an apparatus for producing hot water using an electric heater, it prevents the heater from being heated when the water is insufficient. The present invention relates to an electric hot water circulation device.

[0002]

2. Description of the Related Art As a device for producing hot water by using an electric heater, there is an electric pot used at home. This electric pot, as shown in FIG.
A case 2e for storing hot water, and an electric heater 1 outside the case 2e for heating hot water through the case
e and the thermal fuse 5 arranged on the surface of the electric heater 1e.

In the electric pot having the above-mentioned structure, the electric heater 1e is operated without water in the case 2e.
If the electricity is continuously applied to the electric heater 1e, the electric heater 1e becomes abnormally high in temperature and eventually the electric heater 1e is burned. This state is called dry heating operation. In this state, the temperature of the thermal fuse 5 also becomes high, the thermal fuse 5 is melted by detecting this temperature, and the electric heater 1e is stopped from being energized, so that the heating of the electric heater 1e can be prevented.

Here, since the electric heater 1e does not directly enter the water, the thermal fuse 5 which does not require a waterproof structure can be directly attached to the surface of the electric heater 1e. Also, for home use, the voltage is AC100.
A thermal fuse 5 capable of cutting V is used.

Further, as another device for producing hot water by using an electric heater, as shown in FIG. 6, a case 2f for storing hot water, and an electric heater 1f for heating the hot water inside the case 2f. , A mechanical temperature sensor 6 arranged on the surface of the electric heater 1f.

In the apparatus thus constructed, if the electric heater 1 is continuously energized in a state where there is no water in the case 2f, the electric heater 1f becomes an abnormally high temperature and the mechanical temperature sensor 6 is activated to cause the electricity to flow. The heating of the heater 1f was stopped by stopping the energization.

[0007]

When hot water is produced by using an electric heater for an automobile, the heater is first put in water and the control voltage is DC200V.
High voltage of 300V is used. In addition, vibrations from the vehicle also add to the device.

However, in order to use the above-mentioned conventional structure, first, the thermal fuse is directly attached to the heater, so that the waterproof thermal fuse is required. Further, a thermal fuse that can directly cut the high voltage DC200V to 300V is required. There is no thermal fuse that satisfies these requirements. Moreover, the thermal fuse needs to be replaced once it has blown. To replace the temperature fuse of the hot water circulation device while it is installed in the vehicle, drain the water, remove the device,
It is necessary to open the lid and remove the heater to replace it.
Considering the situation of mounting on the vehicle, it requires a considerably difficult work, and water may leak if not assembled accurately at the time of restoration, which reduces the reliability of the device.

Further, in the mechanical temperature sensor, the capillary tube is projected from the temperature sensing cylinder (temperature sensor portion), and it is necessary to pull it out of the case. If this happens, vibration from the vehicle may be applied and the capillary tube may break. Furthermore, since the main body also has a bimetal type contact structure by itself, it will take up space with a considerably large one, which is quite difficult when considering mounting on a vehicle.

It is also conceivable to use an electric temperature sensor (thermistor) that does not have a temperature sensitive tube and a capillary tube, but it is necessary to put it in water to directly attach it to the heater, and it is also waterproof. And it is necessary to consider high temperature resistance. Again, there are no temperature sensors that meet the requirements.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to make it possible to make a good judgment of an unboiled state with an easy structure and to consider mounting on a vehicle. It is to provide an electric hot water circulation device for an automobile.

[0012]

In order to solve the above problems, the present invention provides a case for storing a liquid and an inside of the case.
And a heater for heating the liquid provided in the
Is provided outside the case, and the heating heater is provided.
A temperature sensor for detecting the temperature of the heater,
A protrusion is provided on the wall surface of the case toward the inside of the case, and the protrusion is
The heating heater and the temperature sensor come into contact with each other via
It is obtained as that.

With this, even if the temperature sensor is not placed in the water, the abnormal heating temperature of the heater can be satisfactorily detected when the water is insufficient.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the above problems, the present invention provides a case for storing a liquid and a case provided inside the case.
And a heater for heating the liquid,
The heater is installed outside the case and
And a temperature sensor for detecting the temperature,
Protrusions are provided on the wall surface toward the inside of the case.
The heating heater and the temperature sensor are in contact with each other.

[0015]

The temperature sensor is provided above the heating heater. Since it is via the case like this, it is not necessary to put the temperature sensor in the water,
Further, since the temperature sensor is placed near the heater, it is possible to excellently detect the abnormal heating temperature of the heater when water is insufficient.

[0017]

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

(Embodiment 1) As shown in FIG. 1, an electric hot water circulation apparatus includes an electric heater 1 for heating hot water, a case 2a for storing hot water, and an upper part of the case 2a is guided inward. 3a is attached. Here, the tip of the guide 3a in the direction opposite to the case 2a is welded to the upper portion 11 of the electric heater 1. Also, guide 3
The inside of a is hollow, and the temperature sensor 4 has a structure in which it is in close contact with the inside of the guide 3a.

In the electric hot water circulation apparatus having the above-described structure, when the electric heater 1 is energized while the water in the case 2a is running low, the temperature of the electric heater 1 is reduced. It becomes extremely hot. This temperature is
It is transmitted to the temperature sensor 4 through the guide 3a.

Here, since the electric heater 1 and the guide 3a are welded, the temperature of the electric heater 1 is easily transmitted, and since the guide 3a and the temperature sensor 4 are also in close contact with each other, the temperature is transmitted to the temperature sensor 4. Cheap. As a result, the temperature difference between the electric heater 1 and the temperature sensor 4 is small. That is, the abnormal temperature can be detected by the temperature sensor 4 before the electric heater 1 reaches a temperature at which it burns out (for example, when the temperature sensor 4 is about 100 ° C., the electric heater 1 becomes about 120 ° C.). When the temperature of the temperature sensor 4 is 100 ° C., it is possible to prevent the electric heater 1 from being burned by stopping energization of the electric heater 1.)

Further, in the electric hot water circulation apparatus thus constructed, the electric heater 1 has two terminal portions 13 and a guide 3a attached to the central portion of the electric heater 1.
Are fixed to the case 2a at a total of three places. Therefore,
The electric heater 1 does not resonate even when vibrations from the vehicle are applied.

Therefore, by simply adding a hollow guide to the case and welding the guide to the electric heater 1, it is possible to reliably detect the abnormal temperature of the electric heater 1 in the empty state with the temperature sensor 4. It is possible to protect the electric heater 1. Further, the reliability of the electric heater 1 against vibration is improved.

As shown in FIG. 2, the guide 3a may be a separate piece guide 3b. Also in this case, the tip of the guide 3b is welded to the upper portion 11 of the electric heater 1. Further, the brim portion of the guide 3b is fixed to the upper portion 14 of the case 2b so that water does not leak. The guide 3b is hollow, and the temperature sensor 4 is attached so as to be in close contact.

(Embodiment 2) As shown in FIG. 3, the electric hot water circulation apparatus comprises an electric heater 1 for heating hot water, a case 2c for storing hot water, and a temperature sensor 4. Here, the upper part of the case 2c is a convex bottom part 12 inward, and the convex bottom part 12 of the case 2c and the upper part 11 of the electric heater 1 are welded. Further, on the convex bottom surface portion 12 of the case 2c outside the case 2c,
The temperature sensor 4 is attached so as to be in close contact.

In the electric hot water circulation apparatus thus constructed, when the electric heater 1 is energized while the water in the case 2a is running low, the temperature of the electric heater 1 is reduced. It becomes extremely hot. This temperature is
It is transmitted to the temperature sensor 4 through the convex bottom surface portion 12 of the case 2c. Here, since the electric heater 1 and the convex bottom surface portion 12 of the case 2c are welded together, the temperature of the electric heater 1 is easily transmitted, and the convex bottom surface portion 12 of the case 2c is further transferred.
Since the temperature sensor 4 is also in close contact with the temperature sensor 4, the temperature is easily transmitted to the temperature sensor 4. As a result, the temperature difference between the electric heater 1 and the temperature sensor 4 is small. That is, the abnormal temperature can be detected by the temperature sensor 4 before the electric heater 1 reaches the temperature at which it burns out.

In addition, in the electric hot water circulation device thus constructed, the electric heater 1 has two terminal portions 13
Then, the convex bottom surface portion 12 of the case 2c attached to the central portion of the electric heater 1 is fixed to the case 2c at a total of three places. Therefore, the electric heater 1 does not resonate even when vibration from the vehicle is applied.

Therefore, since the case 2c itself has a convex shape and is welded to the electric heater 1, it is possible to detect the empty heating by simply processing the case without additional products such as guides, and to prevent vibration. However, it is possible to have an advantageous structure.

In the above description, the contact between the convex bottom surface portion 12 of the case 2c and the heater upper portion 11 is only one point, but as shown in FIG. 4, the convex bottom surface portion 12 of the case 2d has a large area. Alternatively, a plurality of heaters may be contacted.

By contacting a plurality of heaters, the heat of the heaters is transferred from a plurality of places, and the abnormal temperature of the heaters can be detected more reliably and quickly.

Further, as described in the first and second embodiments, the temperature sensor 4 is always installed above the electric heater 1. Therefore, as the water disappears from above, the electric heater 1 also begins to be exposed from above. That is, it is in the upper part of the electric heater 1 without water that the temperature of the hottest starts and the temperature of the electric heater 1 can be detected.

Therefore, it can be judged earlier that the electric heater 1 is in the dry heating mode before the entire electric heater 1 is burnt out, so that the electric heater 1 can be surely protected.

[0032]

As is apparent from the above embodiment, the invention according to claim 1 is such that the case itself has a convex shape and is an electric heater.
Since there is no additional product such as a guide,
The temperature sensor can detect an abnormal temperature of the heater in an empty state by simply processing the heater, and it is possible to prevent the heater from becoming empty. further,
Reliability of the heater against vibration is improved.

[0033]

According to the second aspect of the invention, since the temperature sensor is provided above the electric heater, the abnormal temperature of the heater can be detected quickly even when the water starts to run out. It is possible to surely prevent dry heating.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric hot water circulation device showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an electric hot water circulation device showing another embodiment of the present invention.

FIG. 3 is a configuration diagram of an electric hot water circulation device showing still another embodiment of the present invention.

FIG. 4 is a configuration diagram of an electric hot water circulation device showing still another embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional electric hot water circulation device.

FIG. 6 is a block diagram of another conventional electric hot water circulation device.

[Explanation of symbols]

1,1e, 1f Electric heater 2a, 2b, 2c, 2d, 2e, 2f cases 3a, 3b guide 4 temperature sensor 5 Thermal fuse 6 Mechanical temperature sensor 11 Electric heater top 12 Case convex bottom 13 Heater terminal 14 Guide fixing part

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-6-293211 (JP, A) JP-A-8-234395 (JP, A) Actually open Sho-58-91651 (JP, U) Actual-open Sho-59- 86541 (JP, U) Actually open 50-7548 (JP, U) Actually open 3-79381 (JP, U) Special public 43-17739 (JP, B1) Actual public 40-72 (JP, Y1) Jitsuko Sho 30-30389 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/22 611 H05B 3/00 320 B60H 1/03 F24H 1/10 303 F24H 1/18 503

Claims (2)

(57) [Claims] [1 claim: a case for storing the liquid, comprising a heater for heating the liquid and is mounted within the casing, and a temperature sensor for detecting the temperature of the heater with provided outside of the case An electric hot water circulation device for an automobile, wherein a convex portion is provided on a wall surface of the case inward of the case, and the heating heater and the temperature sensor are in contact with each other via the convex portion. 2. The electric hot water circulation device for an automobile according to claim 1, wherein the temperature sensor is provided above the heater.