JPS6160336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater that has a simple and lightweight structure and is suitable as a general-purpose product.

Hot water storage type water heaters are increasingly being used to supply high-temperature hot water to baths, kitchens, washrooms, etc., and publications such as Japanese Utility Model Application Publication No. 144978/1983 have shown that this type of water heater has Proposed.

Regarding the above-mentioned conventional device, as illustrated in FIG. 3, a heat exchanger 5 functioning as a condenser of the heat pump type refrigeration device is disposed in the lower part of the hot water storage tank 1', and a water supply pipe 23, Hot water outlet pipe 7 at the top
The hot water storage tank 1' was formed into a watertight pressure vessel and had a so-called closed structure.

Therefore, the hot water storage tank 1' needs to have a pressure-resistant structure, and since it is made of thick steel plate, it is heavy, and since watertight treatment is required, processing is complicated and costs are inevitably high.

Therefore, it may be possible to simplify the structure by making the hot water storage tank 1' an open type that is exposed to the atmosphere, but since the temperature of the hot water in the hot water storage tank 1' is highest near the liquid surface, it is difficult to take out hot water. It is normal to connect the pipe 7 to the upper part, and when water is supplied into the tank with an open type, it is normal to provide a water supply port such as an opening of an automatic water supply valve at the upper part of the tank and supply water to the upper part of the tank. The problem with such a structure is that low-temperature make-up water is supplied to the upper layer where high-temperature hot water exists, causing the hot water temperature to drop. The reality is that devices using open hot water storage tanks have not yet become widespread, as they require measures such as adding an auxiliary heater to the upper part of the interior.

In view of this reality, an important objective of the present invention is to realize a water heater using an open hot water storage tank, and to constantly and stably supply hot water. In order to achieve this purpose, the basic structure of the hot water supply system is a hot water supply system in which a heater 5 constituting a condenser of a refrigeration cycle is disposed on the bottom of a hot water storage tank 1 which is open to the atmosphere. The water supply port 21 is provided in the upper part of the hot water storage tank 1, and the bottom of the hot water storage tank 1 is recessed only around the sides and below the heater 5.
Hot water storage tank 1 located below the intermediate portion 51 in the front-rear direction
The bottom wall of the hot water tank 1 and the bottom wall of the hot water storage tank 1 that are continuous to the right and left of the bottom wall are lowered from the lower surface of the heater 5 to form a lowered bottom 22, and a water pool is formed between the lowered bottom 22 and the heater 5. 26, and a water supply passage 10 extending vertically within the hot water storage tank 1, the upper end 10a of which is open to receive make-up water from the water supply port 21, and the lower end 10b of which is connected to the heater 5. The intermediate portion 51 is opened so as to face the water reservoir portion 26 on either the left or right side.

However, by having the above-described structure, the present invention can replenish water to the lower part of the hot water storage tank and take out high temperature hot water from the upper part, so that high temperature hot water can always be taken out stably. It is possible to increase the efficiency of heat exchange with the hot water tank 5, thereby speeding up the heating of water, and to make the hot water storage tank a simple structure that can contribute to cost reduction.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, 1 is a hot water storage tank, which includes a tank main body 2 with an open top, and a lid 3 that covers the opening.
The tank is formed into an open tank that is open to the atmosphere through a slit around the lid 3, and
A heat insulating container is formed by surrounding the inner wall with a heat insulating material 4.

The hot water storage tank 1 has a heater 5, which serves as a condenser for the refrigeration cycle, placed horizontally on the bottom surface of the tank, and the bottom of the tank is stepped by recessing only the lateral and lower portions of the heater 5. As the bottom, as shown in FIG. It is lowered from the lower surface of the vessel 5 and formed into a lower bottom 22.

Since the bottom of the hot water storage tank 1 has the above-described structure, there is a water reservoir between the lowered bottom 22 and the heater 5 that can store the minimum amount of water around the heater 5. 26 are provided.

Reference numeral 6 denotes a water supply valve provided on the upper side wall of the hot water storage tank 1, such as an automatic water supply valve called a ball tap.
The water supply port 21 at the tip opening is opened at the upper part of the hot water storage tank 1, that is, at a position above a predetermined liquid level in the hot water storage tank 1, and when water needs to be replenished, the water supply port 21 is opened from the opening to a lower predetermined liquid level. Water is now being sprayed towards the area.

The hot water tank 1 has a hot water outlet pipe 7 pulled out from the side wall at a position slightly below the liquid level, an overflow pipe 8 pulled out from an appropriate location on the side wall, and a drain pipe 9 pulled out from the bottom wall. ing.

In addition, after the hot water extraction pipe 7 falls into the layer of the heat insulating material 4, it is drawn out from the bottom of the side wall through the pump 11, the check valve 12, and the accumulator 13 in series, and the hot water supply pipe 14 is connected. There is.

On the other hand, the heat pump refrigeration system R has a compressor 1
5. It is equipped with an expansion valve 16 and a heat source side heat exchanger 17, and is connected to the heater 5 through two refrigerant pipes 18 and 19, and the heater 5 is used as a condenser and a heat source side heat exchanger 17. A refrigeration cycle is formed in which each acts as an evaporator.

In the hot water supply device having the above structure, a water supply passage 10 is provided in the hot water storage tank 1, and is formed so that makeup water discharged from the water supply valve 6 can be guided to the bottom of the tank.

The water supply passage 10 is formed as an independent passage extending vertically within the hot water storage tank 1, and can be easily constructed by providing a partition wall that vertically partitions the inside of the tank 1 into two chambers. However, in the illustrated example, a tube made of heat-resistant polyethylene resin with a diameter of 100 mm is hung vertically in the tank, and the upper and lower ends are appropriately fixed.

This water supply passage 10 has both upper and lower ends 10a and 10b.
The upper end portion 10a is provided at a position above the predetermined liquid level where it can receive makeup water discharged from the water supply valve 6, and the lower end portion 10b is provided at a position where it can receive makeup water discharged from the water supply valve 6. It is provided so as to face the water reservoir 26 located on either the left or right side of the water reservoir 26.

In addition, as shown in FIG. 2, the water supply passage 10, which eliminates the tubular shape, is fixed by pressing it from above against the heater 5, which is arranged so that both ends 52, 52 are in contact with the bottom surface of the hot water tank 1. Therefore, the pipe end of the water supply passage 10 is formed into an opening cut diagonally so as to face the heater 5, and the upper edge of this opening is heated. All you have to do is press down on the container 5.

Next, the operating mode of the hot water supply system will be described. By operating the refrigeration system R, condensation heat is exchanged between the high pressure refrigerant gas and the water stored in the tank in the heater 5. The temperature of the water around it gradually increases.

The temperature of the water stored in a predetermined amount in the hot water storage tank 1 rises uniformly in all layers due to convection, and finally hot water of 65 to 70°C is stored in the tank, and the hot water is heated by a command from a water temperature detector (not shown). The refrigeration device R is automatically turned on and off to maintain a constant temperature.

When hot water at a predetermined high temperature is stored and the hand tap 24 at the demand point is opened, the flow switch 20 is activated.
The pump 11 is driven by the operation, and the hot water existing near a predetermined liquid level in the hot water storage tank 1 is sent to the hot water supply pipe 14 through the hot water outlet pipe 7 for hot water supply.

At this time, makeup water in an amount equal to the amount of hot water supplied is discharged from the water supply port 21 of the water supply valve 6, and the makeup water is supplied to the water reservoir 26 near the heater 5 at the inner bottom through the water supply passage 10. Therefore, the hot water outlet pipe 7
In the upper layer where the inlet is open, there is always heated hot water at a high temperature, so the temperature of the hot water that is taken out immediately drops due to the supply of low-temperature make-up water. There is no such inconvenience, and it becomes possible to take out the entire amount of stored high-temperature hot water continuously.

On the other hand, it goes without saying that the make-up water sent to the bottom of the tank through the water supply passage 10 comes into immediate contact with the heater 5 and is heated.

As described above, in the hot water supply device, the bottom of the hot water tank 1 is recessed only around the sides and below the heater 5, and the bottom wall of the hot water tank 1 is lowered below the bottom surface of the heater 5 to form a lower bottom 22. and lowered bottom 22 and heater 5
A water reservoir section 26 is provided between the heater 5 and the lower end thereof, that is, around the sides and below the heater 5.
is opened to face either the right or left side of the intermediate part 51 of the water reservoir part 26, so that the supplied low-temperature make-up water directly flows into the water layer part surrounding the heater 5.

Such a structure has the advantage that water can be smoothly circulated around the heater 5 by convection, thereby promoting heat exchange.

As is clear from the above description, in the present invention, the hot water storage tank 1 is of an open type, so the structure is simple because the tank only needs to have a strength commensurate with the head of the stored water. It can be made of thin material, and a tank made of synthetic resin can be used, so it can be lightweight, and the cost of the device is lower than that of a conventional closed type.

Furthermore, since the water supply passage 10 is provided to guide the make-up water to the inner bottom where the heater 5 is installed, the hot water taken out near the predetermined liquid level can always be maintained at a high temperature, allowing continuous hot water supply. You can get hot water even if you go to the water.

Further, in the present invention, water is introduced into the tank 1 from the side of the heater 5 by providing a recessed water reservoir 26 around the side of the heater 5 at the bottom of the hot water tank 1 and directly below the heater 5. Water can be stored around the heater 5 without using a rectifying plate or the like by preventing water from mixing with hot water.

Moreover, since the present invention has the water reservoir section 26 formed by recessing the bottom, the amount of water stored around the heater 5 can be minimized, so that water can be heated quickly and the water can be circulated by convection. It is advantageous that heating can be carried out in an efficient refrigeration cycle, since the operation can be started from the time when water has accumulated in the water reservoir 26.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of an example of the device of the present invention;
Figure 2 is a cross-sectional view of the bottom of the hot water tank in Figure 1;
FIG. 3 is a schematic structural diagram of a conventional water heater. 1... Hot water tank, 5... Heater, 6... Water supply valve,
10...Water supply passage, 10a...Top end, 10b...
...Lower end, 21...Water inlet, 22...Lower bottom, 2
6...Water pool portion, 51...Intermediate portion of heater 5.

Claims (1)

[Claims] 1 A hot water supply device in which a heater 5 constituting a condenser of a refrigeration cycle is disposed on the bottom of a hot water storage tank 1 whose interior is open to the atmosphere, and the water supply port 21 is connected to the top of the hot water storage tank 1. On the other hand, the bottom of the hot water storage tank 1 is recessed only in the lateral periphery and the lower part of the heater 5, so that the bottom wall of the hot water storage tank 1 located below the intermediate part 51 in the front and back direction of the heater 5 and the bottom thereof are recessed. The bottom wall of the hot water storage tank 1, which is continuous on the left and right sides of the wall, is lowered from the lower surface of the heater 5 to form a lowered bottom 22, and a water reservoir portion 26 is provided between the lowered bottom 22 and the heater 5. A water supply passage 10 extending vertically in the hot water storage tank 1 is provided, the upper end 10a of which is open to receive make-up water from the water supply port 21, and the lower end 10b of the water supply passage 10 extending in the vertical direction. Either water puddle part 2
6. A hot water supply device characterized in that it is opened to face 6.