JPH0774705B2 - Solid heat storage type electric water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater using a solid heat storage body.

[0002]

2. Description of the Related Art Electric water heaters include hot water storage type, rapid heating type and solid heat storage type.

The hot water storage type is a system in which water stored in a tank is heated by an electric heater to form hot water, and the rapid heating type heats water flowing through a water pipe provided around a high density electric heater. It is a method of making hot water. Further, the solid heat storage type is a system in which a solid heat storage body is heated by an electric heater to store heat, and the heat released from the solid heat storage body is used to heat water.

However, since the hot water storage type electric water heater requires a large hot water storage tank in which water is heated and stored in advance, a large installation space must be secured. Therefore, the hot water storage tank is made small and the water in the tank is constantly heated, but in this case, the economical efficiency is poor. The rapid heating type electric water heater requires a large-capacity electric heater to heat the flowing water, so that the electric power consumption increases and the economy is poor.

On the other hand, the solid-state heat storage type electric water heater uses the late-night power, which has a low electricity charge, to store heat, so that it is more economical in terms of electricity charge than the above two methods. Recently, it is widely used in various fields.

[0006]

However, the solid heat storage type electric water heater has the following problems.

That is, the solid-state heat storage type electric water heater is suitable for obtaining hot water having a large capacity (for example, 200 liters or more), but in the case of a capacity of 1000 liters or less, it is smaller than that of a small capacity. Therefore, there is a problem that the solid heat storage body becomes large.

This is for the following reason. That is, in the conventional solid-state heat storage type electric water heater, since the heat exchanger and the heat storage body are provided at fixed positions with a constant space, air that is a carrier of heat is circulated to the heat exchanger. This is because it is necessary to install a blower to let the air pass through.

The present invention has been made based on the above circumstances, and effectively uses the heat accumulated in the fixed heat storage body to heat the water flowing through the heat exchanger, thereby suppressing the increase in the size of the fixed heat storage body. In particular, it is an object of the present invention to provide an electric water heater suitable for a small capacity.

[0010]

In order to achieve the above object, a solid regenerator type electric water heater according to the present invention heats a main body housing, a fixed heat storage body provided in the main body housing, and the fixed heat storage body. An electric heater, and a heat exchanger provided inside the main body housing for flowing water and heating the water by heat released from the solid heat storage body,
A drive device for moving the heat exchanger between a position close to and a position separated from the solid heat storage body, a heat shield provided in the main body housing, and the heat shield as the heat exchanger. And a drive device that moves between a position that shuts off the fixed heat storage body and a position that is separated from the heat exchanger.

[0011]

[Function] When water is not passed through the heat exchanger and heat exchange is not performed, the heat exchanger is separated from the solid heat storage body, and the heat exchanger is shut off from the solid heat storage body by the heat shield. In the case of suppressing wasteful heat release of the heat exchanger and conducting heat exchange by passing water through the heat exchanger, the heat exchanger is brought close to (including direct contact with) the solid heat storage body, and the solid heat storage body by the heat shield is also used. The heat of the solid heat storage body is heated to effectively heat the water by shutting off the heat exchanger. Therefore, by effectively utilizing the heat accumulated in the solid heat storage body, it is possible to suppress the increase in size of the solid heat storage body.

[0012]

FIG. 1 and FIG. 2 show an embodiment of the present invention.
This will be described with reference to (a). 1 and 2 show the entire electric water heater.

In the figure, reference numeral 1 designates a main body housing made of a heat insulating material. The main body housing 1 is a first chamber 2, a second chamber 3 which is in parallel with the chamber 2 and communicates therewith, and these chambers 2 and 3. It has a third room 4 located below.

In the first chamber 2, a plurality of solid heat storage bodies 5 forming a rectangular block are stacked and provided. Further, an electric heater 6, specifically, a sheath heater is provided in combination with each solid heat storage body 5. Each electric heater 6 is connected to a power supply circuit (not shown).

A heat exchanger 7 is provided in the second chamber 3,
The third chamber 4 is provided with a drive device that moves the heat exchanger 7 toward and away from the solid heat storage body 5. The heat exchanger 7 includes a heat receiving plate 8 and a water pipe 9 attached to the heat receiving plate 8.

The heat receiving plate 8 has a size corresponding to a stack of a plurality of solid heat storage bodies 5 and is made of a material having a high heat absorption property. The water pipe 9 is meandering and is connected to a water supply source (not shown) provided outside the main body housing 1, for example, a water pipe or a water pipe connected to a water receiving tank.

A feed screw shaft 10 and a guide angle shaft 11 are provided in the third chamber 4 along the direction in which the heat exchanger 7 approaches and separates from the solid heat storage body 5, and the feed screw shaft 10 is an electric motor 12. It is designed to be rotated by.

A screw ring 13 is screwed onto the feed screw shaft 10 as shown in FIG. 2B, and a moving ring 14 is movably fitted to the guide angle shaft 11 as shown in FIG. There is. The screw ring 13 and the moving ring 14 are attached to a moving base 15 arranged above the feed screw shaft 10 and the guide angle shaft 11, and the heat receiving plate 8 of the heat exchanger 7 is attached to the movable body 15.

Therefore, the feed screw shaft 1 is driven by the electric motor 12.
When 0 is rotated, the screw ring 13 is prevented from rotating and moves along the axial direction of the feed screw shaft 10. For this reason, the moving base 15 includes a moving ring 14 that moves the screw ring 13 and the guide angular axis 11.
And the heat exchanger 7 is moved by the moving table 15 along the direction in which the heat exchanger 7 approaches and separates from the solid heat storage body 5. That is, the heat exchanger 7 approaches the solid heat storage body 5 A
It is moved between a position and a B position away from the solid heat storage body 5.

A pair of heat shield plates 16 and 17 are provided inside the second chamber 3. Each of the heat shields 16 and 17 has a side portion corresponding to the height of the heat receiving body 8 of the heat exchanger 7 and the heat receiving plate 8.
Is a square plate having a side slightly longer than half the length of, and is made of a heat insulating material.

The heat shields 16 and 17 are vertically arranged on both side portions of the main body housing 1 in a direction perpendicular to the moving direction of the heat exchanger 7, and are rotatably provided on the main body housing 1. It is attached to the rotary shafts 18 and 19.

That is, the pair of heat shields 16 and 17 are located at the C position (heat exchanger) which closes the communication opening between the second chamber 3 and the first chamber 2 about the vertical rotation shafts 18 and 19. 7 in a direction perpendicular to the moving direction of the heat exchanger 7
And a solid heat storage body 5) and a D position along both sides of the main body housing 1 (parallel to the moving direction of the heat exchanger 7, and the heat exchanger 7 and the solid heat storage body). It is provided so as to rotate between the body 5 and a position apart from the body 5.

A drive device for rotating the heat shields 16 and 17 is provided in the third room 4. This drive device is provided independently for each of the heat shields 16 and 17, and the heat shield 16 is shown as an example in FIG.

The drive device includes an electric motor 20 installed in the main body housing 1, a gear 21 attached to the output shaft of the electric motor 20, and a gear 21 attached to the lower end of the rotary shaft 18 of the heat shield 16 and meshed with the gear 21. It has a gear 22 that rotates. That is, when the electric motor 20 is driven to rotate the gear 21, the rotation is transmitted to the rotary shaft 18 through the gear 22.
At the same time, the heat shield 16 is rotated between the C position and the D position. The operation of the solid-state heat storage type electric water heater configured as described above will be described. This electric water heater energizes the electric heater 6 by using midnight power, and heats the solid heat storage body 5 by the heat generated by the electric heater 6 to accumulate the heat.

When the solid heat storage body 5 stores heat, water is not passed through the heat exchanger and heat exchange is not performed. When heat exchange is not performed in the heat exchanger 7 as described above,
The heat exchanger 7 is moved to the position B away from the first chamber 2 as shown by the solid line.

Then, the pair of heat shields 16 and 17 are rotated to the C position as shown by the solid lines in FIGS. As a result, it is possible to prevent the heat accumulated in the solid heat storage body 5 from being released and transferred to the heat exchanger 7 as radiant heat, and it is possible to suppress wasteful consumption of the heat stored in the solid heat storage body 5.

The same operation is performed when water is not passed through the other heat exchangers and heat exchange is not performed. When hot water is supplied, the pair of heat shields 16 and 17 are rotated to the D position as shown by the alternate long and short dash line in FIGS. The heat exchanger 7 is moved to the position A close to the solid heat storage body 5 shown by the alternate long and short dash line in FIGS. As a result, when the heat accumulated in the solid heat storage body 5 is released, it is transferred to the heat exchanger 7 adjacent to the solid heat storage body 5 as radiant heat in a very short distance.

When water is flown through the water pipe 9 of the heat exchanger 7, the water is heated by the heat radiated from the solid heat storage body 5 and its temperature rises to become hot water. Therefore, the hot water can be obtained by effectively utilizing the heat of the solid heat storage body 5.

Therefore, in the electric water heater of this embodiment, the solid heat storage body 5 can be prevented from increasing in size by effectively utilizing the heat stored in the solid heat storage body 5, and the electric power of the conventional solid heat storage type can be suppressed. It can be effectively applied to a small capacity of 1000 liters or less, which was difficult with a water heater. In the heat exchanger 7 of this embodiment, the heat receiving plate 8 is used, so that the heat radiated from the solid heat storage body 5 can be efficiently transferred to the water pipe 9.

In the present embodiment, the heat exchanger 7 is provided at a position close to the solid heat storage body 5, but the heat exchanger 7 may be brought into direct contact with the solid heat storage body 5. Further, in this embodiment, the means for moving the heat exchanger 7 and the finisher feed screw are used.
Instead of this, a ball screw may be used. FIG. 3 shows an electric water heater according to another embodiment of the present invention.

In FIG. 3, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted. In the figure, 23 and 24 are a pair of heat exchangers, each having a heat receiving plate 25 and a water pipe 26 attached to the heat receiving plate 25.

The pair of heat exchangers 23 and 24 are arranged vertically and are attached to rotary shafts 27 and 28 which are vertically provided in the main body housing 1, and are located at the E position close to the solid heat storage body 5 and the solid heat storage. It is provided so as to rotate between the F position separated from the body 5.

Reference numerals 29 and 30 denote a pair of heat shields. The heat shields 29 and 30 are vertically arranged and attached to rotary shafts 31 and 32 vertically provided in the main body housing 1, and the heat exchanger 7 is provided. It is provided so as to rotate between a G position for disconnecting the solid heat storage body 5 and the solid heat storage body 5 and an H position for releasing the cutoff between the heat exchanger 7 and the solid heat storage body 5. . The electric water heater of this embodiment also has the same motion and effect as the electric water heater of the first embodiment.

The drive device for rotating the pair of heat exchangers 23, 24 and the pair of heat shields 29, 30 is, for example, the main body housing 1 like the drive device shown in the first embodiment.
Is provided in the lower room, and is composed of, for example, a combination of an electric motor and gears. It should be noted that the present invention is not limited to the above-described embodiments, but can be modified and implemented in various ways.

[0035]

As described above, according to the present invention, the heat accumulated in the fixed heat storage body is effectively used to heat the water flowing through the heat exchanger, thereby achieving miniaturization, and particularly, a small capacity. It is possible to obtain a solid-state heat storage type electric water heater suitable for one.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an electric water heater according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view seen from the Z direction in FIG. (B)
FIG. 6 is a diagram showing a combination of a feed screw shaft and a screw ring. (C) is a figure which shows the combination of a guide angular axis and a moving ring.

FIG. 3 is a sectional view showing an electric water heater according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Main body housing, 5 ... Solid heat storage body, 6 ...
Electric heater, 7 ... Heat exchanger, 16, 17
… A heat shield.

Claims (1)

[Claims] 1. A main body housing, a fixed heat storage body provided in the main body housing, an electric heater for heating the fixed heat storage body, water provided inside the main body housing and discharged from the solid heat storage body. A heat exchanger that heats the water by the generated heat; a drive device that moves the heat exchanger between a position close to and a position separated from the solid heat storage body; A heat shield; and a drive unit for moving the heat shield between a position that blocks the heat exchanger from the fixed heat storage body and a position that is separated from the heat exchanger. Solid heat storage type electric water heater.