JPH0673651U - Temperature control device for instant hot water storage type electric water heater - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a temperature control device which is an immediate heating type hot water storage type electric water heater provided with a heating can and a heating pipe, and which can reliably prevent excessive rise and fall of hot water. [Structure] A hot water storage tank 1, a heating can 4, a heater 5 arranged inside the heating can 4, and a guiding pipe 10 for sending hot water heated from the top of the heating can 4 to the upper part of the hot water storage tank 1. Pipe inserted in the heating can 4 in the electric water heater
A temperature sensor 42 was attached to the inside of the heater 41. When the hot water in the heating can 4 reached a preset upper limit value by the temperature sensor 42, the heater 5 was turned off. Further, a heating pipe 20 that constitutes a passage for guiding the hot water from the bottom to the upper part of the hot water storage tank 1
Also, in an electric water heater equipped with a heater 5 arranged in the heating section below the on-off valve 11 attached to the heating pipe 20, the temperature sensor 42 is inserted into the heating section in the same manner.
Install. A controller with a sensor may be attached instead of the temperature sensor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temperature control device for an instant hot water storage type electric water heater. More specifically, the present invention relates to a temperature control device in an immediate heating hot water storage type electric water heater having a function of rapidly heating a part of water in a hot water storage tank and extracting the hot water in a short time.

[0002]

[Prior art]

 In the conventional electric water heater, since the entire water in the hot water storage tank is heated to a predetermined temperature, there is a problem that hot water at a desired temperature cannot be taken out when the hot water runs out. Therefore, the present inventor has provided an immediate heating mechanism for taking out hot water in a short time even after the hot water is cut off by heating a part of the water in the hot water storage tank and storing it in the upper part of the hot water storage tank. A rapid heating hot water storage type electric water heater has been proposed, and as its basic type, there are the rapid heating hot water storage type electric water heater described in JP-A-4-43257 and JP-A-4-139355. These rapid heating hot water storage type electric water heaters are characterized by heating only the water in the heating can or heating pipe installed in the hot water storage tank to raise the temperature quickly.

[0003]

[Problems to be solved by the device]

 In the above quick-heating hot water storage type electric water heater, if the hot water is overheated, it may cause damage to the hot water tank, so abnormal temperature rise must be prevented. Since the conventional electric water heater did not have a heating can or heating pipe, the temperature controller was installed by selecting the wall surface of the tank that is convenient for detecting the entire hot water temperature in the hot water storage tank. However, since the temperature of the hot water in the heating can or the heating pipe cannot be grasped by means similar to this, it is not possible to prevent excessive temperature rise.

In view of such circumstances, the present invention has a temperature capable of reliably preventing an excessive temperature rise of hot water even in an immediate heating hot water storage type electric water heater having a heating can and a heating pipe in a hot water storage tank. The purpose is to provide a control device.

[0005]

[Means for Solving the Problems]

 The instant hot water storage type electric water heater of the first invention is a hot water storage tank, a heating can, a heater disposed inside the heating can, and hot water heated from the top of the heating can above the hot water tank. In a rapid heating hot water storage type electric water heater equipped with a pipe for sending water to a pipe, a temperature sensor or controller is installed in a pipe inserted in the heating can or a pipe arranged close to the hot water in the heating can. When the hot water in the heating can reaches a preset upper limit value by the temperature sensor or the controller, the controller for turning off the power source of the heater is operated. Also, instead of mounting the temperature sensor or controller in the pipe inserted in the heating can or in the pipe placed close to the hot water in the heating can, the hot water storage tank in the part where the hot water heated in the heating can approaches A temperature sensor or controller may be attached to the wall.

[0006] An instant heat type hot water storage type electric water heater according to a second aspect of the present invention is a hot water storage tank, a heating pipe for forming a passage for guiding hot water from a bottom portion to an upper portion of the storage tank, and the heating pipe. In a rapid heating hot water storage type electric water heater equipped with a heater arranged in the heating section below the on-off valve attached to the pipe, the pipe inserted into the heating section or inside the pipe close to the hot water in the heating can A temperature sensor is attached, and when the temperature of the hot water in the heating unit reaches a preset upper limit value, a controller for turning off the power of the heater is operated.

[0007]

[Action]

 In the first invention, the temperature of the hot water in the heating can is directly detected by the temperature sensor or controller in the pipe, or the temperature sensor or controller mounted on the wall surface of the tank in contact with the hot water in the heating can. Since the temperature sensor or controller directly detects the hot water temperature in the heating part of the heating pipe, it is possible to accurately grasp the hot water temperature and reliably monitor overheating.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is an overall longitudinal sectional view of the first embodiment of the present invention, and FIG. 2 is an enlarged view around the temperature control device.

First, the basic structure will be described with reference to FIG. 1. Reference numeral 1 is a hot water storage tank, the outer periphery of which is covered with a heat insulating heat insulating material 2 and is housed in a box-shaped outer plate 3. A heating can 4 is arranged at the bottom of the hot water tank 1, and an opening for connecting the molten metal pipe 10 is formed at the top of the heating can 4. Further, a heater 5 is arranged inside the heating can 4, and a lower end of the molten metal pipe 10 is connected to the top of the heating can 4 so as to communicate with the inside of the heating can 4. Further, the upper end of the molten metal pipe 10 is opened at the upper part of the hot water storage tank 1. An open / close valve 11 is attached at an arbitrary position from the upper end to the lower end of the molten metal pipe 10. The open / close valve 11 opens when the internal temperature of the heating can 4 reaches a predetermined temperature, and It has the function of closing the valve when the temperature falls below the temperature.

In the figure, 13 is a water supply pipe, 14 is a pressure reducing valve connected to a water pipe or the like, 15 is a hot water pipe, and 16 is a hot water tap. Although not shown in the drawing, the first invention also includes a heating can 4, a heater 5, and a molten metal pipe 10 arranged outside the hot water storage tank 1.

In this electric water heater, when boiling water, water is put into the hot water storage tank 1 from the water supply pipe 13 and the heater 5 is energized. At this time, since the water temperature inside the heating can 4 is low, the open / close valve 11 is closed, and only the water inside the heating can 4 is heated, so that it is boiled to boiling water in a very short time. When the hot water reaches a predetermined temperature (for example, 90 ° C), the on-off valve 11 detects the high temperature and opens, but the specific gravity of the hot water is smaller than the specific gravity of water. It rises through the hot water pipe 10 and is stored near the upper end opening of the hot water pipe 10. When the boiling water rises due to the difference in specific gravity in this way, at the same time, water enters the heating can 4 from the bottom. When water enters, the on-off valve 11 feels a low temperature and closes, so the rise of the hot water stops and the heater 5 heats only the water that has entered the heating can 4. After that, as the temperature of the hot water below the open / close valve 11 in the heating can 4 and the hot water pipe 10 rises, the open / close valve 11 repeats opening and closing intermittently, so that hot water accumulates from above the hot water storage tank 1 in sequence. By increasing the amount, one hot water storage tank will eventually be filled. As described above, in the electric water heater of the present embodiment, the hot water is stored in sequence, so that the time for discharging hot water can be greatly shortened.

Next, details of the temperature control device will be described with reference to FIG. Reference numeral 41 is a pipe inserted into the heating can 4, and a temperature sensor 42 is mounted inside the pipe. The pipe 41 may be inserted in the heating can 4 or may be arranged in a position close to the hot water in the heating can 4. Even in this case, the hot water in the heating can 4 can be accurately detected by the temperature sensor 42. As the temperature sensor 42, any temperature sensor can be used without particular limitation as long as it can detect the temperature of the hot water, but in terms of reliability and compactness, a thermostat, a manual reset type thermostat, a liquid expansion thermostat, etc. can be used. preferable. A well-known controller for turning on / off the power of the heater 5 may be arranged outside the hot water storage tank 1, and the controller is connected to the temperature sensor 42 by an electric wire or a capillary tube. Although the temperature sensor 42 and the controller may be separate from each other as described above, an integrated controller with a sensor may be mounted in the pipe 41.

In the case of the present embodiment, the temperature sensor 42 and the controller directly detect the hot water temperature in the heating can 4, and when the preset upper limit value is detected, the controller is operated to turn off the power. Therefore, it is possible to reliably prevent excessive temperature rise.

Reference numeral 43 is a temperature sensor mounted on the wall surface of the hot water storage tank 1, and a thermostat or the like is also suitably used. The temperature sensor 43 monitors the whole hot water temperature in the hot water storage tank 1. is there. The controller connected to the hot water temperature sensor 43 can also be used as the controller of the temperature sensor 42 described above.

In addition, in the heating can 4, the side wall of the heating can 4 is formed with a double wall to provide an air reservoir 30, and the hot water guide pipe 10 is also formed of a double pipe 32 to provide an air reservoir 33. The air separated from the above air and the air dissolved in water during heating is collected and insulated by air. However, the heating can 4 and the pipe 10 are not limited to this, and other heat insulating means may be used. Even if it does not use any heat insulating means, it is included in the present invention. Further, 51 is an air vent hole.

(Second Embodiment) FIG. 3 is an enlarged view of a main portion of another embodiment of the first invention. The heating can 4 of this embodiment is lowered in the hot water storage tank 1, and the heater 5 is also located at a relatively low position. Therefore, at the bottom of the hot water storage tank 1 facing the lower opening of the heating can 4, the hot water heated by the heater 5 is always in close proximity to or in contact therewith, and therefore, If a temperature sensor 42 or a controller is attached to the wall surface of the hot water storage tank 1 at this portion, the hot water temperature in the heating can 4 can be accurately detected. Therefore, it is possible to prevent excessive temperature rise as in the first embodiment.

(Third Embodiment) This is still another embodiment of the first invention, and FIG. 4 is an enlarged view of a main part thereof. In this embodiment, the heating can 4 is laterally moved inside the hot water storage tank 1, and the wall surface of the hot water storage tank 1 also serves as the partition wall of the heating can 4. In such a configuration, since the hot water always comes into contact with the hot water tank wall surface 4a that constitutes the heating can 4, the temperature sensor 42 or the controller attached to this wall accurately detects the hot water temperature in the heating can 4. be able to. Therefore, as in the second embodiment, it is possible to reliably prevent excessive temperature rise.

(Fourth Embodiment) FIG. 5 is an overall longitudinal sectional view of an embodiment of the second invention, and FIG. 6 is an enlarged view around the temperature control device. Referring to FIG. 5, the basic structure will be described. A heating pipe 20 is installed in the hot water storage tank 1, and an on-off valve 11 is provided in the middle of the pipe. The part of the heating pipe 20 below the on-off valve 11 is a heating part, and the heater 5 is installed inside the heating part. This heating pipe 20 is designed such that the functions of the pipe 10 and the heating can 4 in the first invention (first embodiment) are replaced by a single straight pipe. Has a heat function. Although not shown, the second invention also includes the one in which the heating pipe 20 and the heater 5 are arranged outside the hot water storage tank 1.

Next, details of the temperature control device will be described with reference to FIG. Reference numeral 41 is a pipe, and 42 is a temperature sensor or controller mounted inside the pipe. In the electric water heater using the heating pipe 20, the part of the heating pipe 20 below the on-off valve 11 is the heating part. Therefore, either insert it together with the heater 5 or use the hot water inside the heating part. Installed in a close proximity. The temperature sensor 42 or the controller may be the same as in the first embodiment.

Also in this embodiment, since the hot water temperature in the heating section can be directly detected, it is possible to reliably monitor the excessive temperature rise of the hot water as in the first embodiment. The temperature sensor 43 or the controller mounted on the wall surface of the hot water storage tank 1 is the same as in the first embodiment. Further, the heating pipe 20 is formed of a double pipe 32 and is provided with an air reservoir 33, which has an air heat insulating structure. However, a heat insulating structure by other means may be adopted, or a structure that does not perform heat insulating may be adopted. Is also good.

[0021]

[Effect of device]

 According to the present invention, since the hot water temperature in the heating portion of the heating can or the heating pipe can be accurately grasped, it is possible to reliably prevent the excessive temperature rise of the hot water and prevent damage accidents of the hot water storage tank. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric water heater according to an embodiment (first embodiment) of the first invention.

FIG. 2 is an enlarged view around the temperature control device of the first embodiment.

FIG. 3 is an enlarged view around a temperature control device according to another embodiment (second embodiment) of the first invention.

FIG. 4 is still another embodiment of the first embodiment (third embodiment).
It is an enlarged view around the temperature control device concerning.

FIG. 5 is a vertical sectional view of an electric water heater according to an embodiment (fourth embodiment) of the second invention.

FIG. 6 is an enlarged view around a temperature control device according to a fourth embodiment.

[Explanation of symbols]

1 Hot water storage tank 4 Heating can 5
Heater 10 Hot water pipe 11 Open / close valve 20
Heating pipe 41 Pipe 42 Temperature sensor or controller

Claims (3)

[Scope of utility model registration request] 1. Immediate heat provided with a hot water storage tank, a heating can, a heater arranged inside the heating can, and a guide pipe for sending hot water heated from the top of the heating can to the upper part of the hot water storage tank. In a hot water storage type electric water heater, a temperature sensor or controller is attached to a pipe inserted in the heating can or a pipe arranged in proximity to the hot water in the heating can, and the temperature sensor or controller is used in the heating can. A temperature control device for an instant heating type hot water storage type electric water heater, characterized in that when the hot water reaches a preset upper limit value, the heater is turned off. 2. Instead of mounting a temperature sensor or controller in a pipe inserted in the heating can or in a pipe arranged close to the hot water in the heating can, the hot water heated in the heating can approaches 2. The temperature sensor or controller is attached to the wall surface of the hot water tank in a portion.
A temperature control device for the instant hot water storage type electric water heater described. 3. A hot water storage tank, a heating pipe for forming a passage for guiding hot water from a bottom portion to an upper portion of the hot water storage tank, and a heating portion below an on-off valve attached to the heating pipe. In a hot water storage type electric water heater equipped with a heater, a temperature sensor or controller is mounted in a pipe inserted in the heating unit, and the hot water in the heating unit is set in advance by the temperature sensor or controller. When the upper limit value is reached, the heater is turned off, and a temperature control device for a rapid heating hot water storage type electric water heater.