JPS5811545B2 - hot water storage type water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat exchanger disposed outside an insulated hot water storage tank, an outgoing pipe extending from the lower part of the hot water storage tank to an inlet of the heat exchanger, and an outlet pipe of the heat exchanger. and a return pipe leading from the top of the hot water storage tank to the top of the hot water storage tank, and with the heating action of the heat exchanger,
The water in the hot water storage tank is configured to naturally circulate water in the lower part of the hot water storage tank to the upper part of the hot water storage tank through the heat exchanger, so that the water in the hot water storage tank is boiled sequentially from the upper part in a stratified manner, and
By providing a control circuit that can control the heating action of the heat exchanger based on the temperature detection results by water temperature detectors provided at the upper and lower parts of the hot water storage tank, the amount of heating by the heat exchanger can be selectively controlled. The present invention relates to a hot water storage type water heater that is configured to be configurable.

In this type of hot water storage type water heater, the high temperature water heated by the heat exchanger is stored in the upper part of the hot water storage tank, and is kept well separated from the water at the lower part, which is near room temperature, so that the desired high temperature can be achieved. Water can be obtained in an extremely short time, and through selective operation of the control circuit, the amount of hot water required for washing, cooking, showering, and reheating the bath is relatively small, even though it has only one hot water tank. demand for hot water supply,
Since the appropriate amount of hot water and amount of hot water can be set arbitrarily for refueling demands such as hot water supply to a bath, where the required amount of hot water is small, the waste of heating energy can be minimized.
Furthermore, as mentioned above, the lower part of the hot water storage tank is kept at near room temperature when there is no demand for large-volume hot water supply, so there is almost no heat loss from the water stored in the lower part, and solar heat and other waste heat can be absorbed. It is also easy to use effectively as a preheating source.
These also have various advantages, such as a large energy saving effect.

However, with conventional hot water storage type water heaters of this type, for example, Japanese Unexamined Utility Model Publication No. 52-98254 and Japanese Unexamined Patent Publication No. 51-1999
As disclosed in Japanese Patent No. 55052, a changeover switch is provided for each of a plurality of water temperature detectors installed above and below in a hot water storage tank, and the amount of heated water is determined by selectively switching these switches. The control circuit was configured to set the

Therefore, in other words, with such a configuration, if the amount of hot water to be heated is to be changed, a desired one of the changeover switches must be selected and operated, which is troublesome.

Because of this trouble, when supplying a large quantity of hot water, such as supplying hot water to a bath, for example, after operating the changeover switch to enter the mass heating control state, the period for the large quantity of hot water supply has passed and the state shifts to the period for the small quantity of hot water supply. Despite this, it is often the case that people forget to switch the changeover switch to the small-volume heating control state, which tends to cause unnecessary heating action and significant energy loss due to heat dissipation. There remained a drawback.

The present invention has been developed based on the above-mentioned situation and the actual hot water supply pattern in each household, that is, a hot water supply pattern in which large quantities of hot water, such as hot water for a bath, are normally only required once a day, and only small quantities of hot water are required thereafter. This was done in consideration of the situation, and its purpose is to realize a large-volume heating control state by operating a switch only when a large amount of hot water is required, and to realize a state of large-volume heating control without having to operate any switch for subsequent small-volume hot water demands. The purpose is to make the operation extremely simple so that the state can be automatically switched to the small amount heating control state, and to prevent large energy loss due to the user forgetting to operate as described above.

In order to achieve the above object, the hot water storage type water heater according to the present invention has the following features:
In the above-described control circuit, the control circuit includes an automatic return type operating switch, a relay whose contacts close when the automatic return type operation switch is turned on, and both of the above when the contacts of the relay are in the closed state. When at least one of the contacts of the water temperature detector is in a state where it is detecting that the water temperature is below the set temperature, and when the contact of the relay is open, both of the contacts of the water temperature detector are A fuel control electromagnetic valve is provided that operates to exert the heating action of the heat exchanger when the water temperature is detected to be below a set temperature, thereby turning on the automatic return type operation switch. Sometimes, the heating action of the heat exchanger is continued until the water temperatures detected by both the water temperature detectors installed at the upper and lower parts of the hot water storage tank both reach a set temperature, and after that, The heating action of the heat exchanger is stopped as soon as the water temperature detected by the water temperature detector provided at the upper part of the hot water tank reaches the set temperature earlier than the water temperature detector provided. It has the characteristic that it is structured to make it easier to use.

Because of this characteristic configuration, the user only has to turn on the automatic return type operation switch only when there is a demand for a large amount of hot water supply, such as when supplying hot water to a bath, and the user can obtain a mass heating control state that corresponds to the demand for a large amount of hot water supply. Moreover, after that, the system can automatically switch to the low-volume heating control state that corresponds to the demand for small-volume hot water supply without requiring any switch operations on the part of the user, making it extremely easy to operate for the user. At the same time, we were able to make it extremely compatible with the actual hot water supply patterns in each household as described above.

Furthermore, since the switching from the large amount heating control state to the small amount heating control state is automatically performed as described above,
This eliminates the large energy loss caused by forgetting to change the switch when transitioning from a large amount of water demand to a small amount of hot water demand, as in the past, resulting in extremely high energy savings.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1 shows the cross-sectional structure of the entire hot water storage type water heater. 1 is a hot water storage tank whose entire circumference is heat-insulated, and 2 is a fin-tube type heat sink that heats water using combustion gas from a burner 3. This is an exchanger and is arranged below the hot water storage tank 1.

Both of these 1 and 2 are separated from each other and configured individually, and open into the heated water descending/outgoing pipe 4 led out from the bottom of the lower opening of the hot water storage tank 1 and into the upper part A of the hot water storage tank 1. The heated water supplied into the hot water tank 1 through the water supply pipe 6 connected to the bottom of the lower mouth of the hot water storage tank 1 is sequentially connected to the rising and returning pipe 5. The water flows between the hot water storage tank 1 and the heat exchanger 2 in such a way that it reaches the inside of the heat exchanger 2 through the hot water storage tank 1 and the heat exchanger 2, where it is heated, and is then discharged through the rising return pipe 5 to the upper part A of the hot water storage tank 1. It is gradually heated through natural circulation based on the temperature difference, and as the heating progresses, a temperature distribution is created such that even if the upper part A in the hot water storage tank 1 reaches the required hot water supply temperature, the lower part remains close to room temperature. .

Water temperature detecting devices 7 such as thermostats are installed on the tank walls corresponding to the upper and lower ports of the hot water tank 1, respectively.
7' is attached, and in response to the detection of the set hot water temperature (which may be the same or different) by these water temperature detectors 7, 7', the water temperature is supplied to the burner 3. A control circuit A is provided that can selectively control the amount of heating for the heat exchanger 2 in response to water temperature detection so as to operate a fuel control electromagnetic valve 9 interposed in the fuel supply path 8. It is composed of

FIG. 2 shows an electric circuit diagram constituting the control circuit A, where 7A and 7A' are the contact points of the water temperature detectors 7 and 7', and when the detected water temperature reaches the set temperature, the non-heating request side a
, a', and when the detected water temperature falls below the set temperature, the heating request side switches to b'.

L and L' are heated to the required temperature and contact points 7A and 7A'
This is a boiling indicator lamp that lights up when switching to the non-heating request side a, a'.

SW1 is an automatic return type manually operated switch, and when this switch SW1 is turned on, the relay X is energized and its self-holding contacts XA, XA are self-held in the closed state.

Reference numeral 9 indicates that when the contacts XA and XA of the relay When, and the contacts XA, XA of said relay X
In the open state, the contact point 7 of both water temperature detection devices 7, 7'
This is a fuel control electromagnetic valve that operates to exert the heating effect of the heat exchanger 2 only when both A and 7A are switched to the heating request side A, b'.

That is, according to this configuration, when the automatic return type operation switch SW1 is turned on when a large amount of hot water is required, the water temperature detection devices 7 and 7' provided at the upper and lower ports of the hot water storage tank 1 are detected. The heating action of the heat exchanger 2 continues until both detected water temperatures reach the set temperature, and when a small amount of hot water is required thereafter, the water temperature detection device 7' provided at the lower opening of the hot water storage tank 1 The heating action of the heat exchanger 2 is automatically stopped as soon as the water temperature detected by the water temperature detector 7 installed in the upper part A of the hot water tank 1 reaches the set temperature. Therefore, energy loss due to unnecessary combustion, such as heating even the lower opening when a small amount of hot water is required, is automatically avoided without requiring any operation.

SW2 in the figure is a main switch. In short, when the automatic return type operation switch SW1 provided in the control circuit A is turned on, the temperature detected by the water temperature detectors 7 and 7' provided at the upper and lower ports of the hot water storage tank 1 is The heating action of the heat exchanger 2 is continued until both reach the set temperature, and after that, the heating action of the heat exchanger 2 is continued based only on the water temperature detector 7 provided in the upper part A of the hot water storage tank 1. It is designed to control the action.

In addition, in FIG. 1, 10 is a hot water supply pipe led out from the upper part of the hot water storage tank 1, and 11 is a preheating heat exchanger inserted into the lower opening of the hot water storage tank 1. By connecting the solar heat collector 12 and other waste heat recovery devices as shown in , it can be used to heat the lower opening, which has the advantage of further increasing the energy saving effect.

Furthermore, if a partition plate 13 with communicating holes is provided between the upper part A and the lower opening in the hot water storage tank 1, it is more advantageous to achieve the desired purpose. 14
By installing this, this water heater can be developed into a central hot water heater.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the hot water storage type water heater according to the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a control circuit diagram. 1... Insulated hot water storage tank, A... Upper part of 1,
Mouth...lower part of 1, 2...heat exchanger, 4
...Outbound pipe, 5...Return pipe, 7,7'...
...Water temperature detector, 7A, 7A...7゜7'
Contact, 9... Solenoid valve, A... Control circuit SW1... Automatic return type operation switch, X
...Relay, XA...X contact.

Claims (1)

[Claims] 1. A heat exchanger 2 is disposed outside the insulated hot water storage tank 1, and an outgoing pipe 4 runs from the lower opening of the hot water storage tank 1 to the inlet of the heat exchanger 2, and from the outlet of the heat exchanger 2 to the hot water storage Tank 1
A return pipe 5 leading to the upper part A of the hot water storage tank 1 is provided, and as the heat exchanger 2 heats, the water at the lower mouth of the hot water storage tank 1 is transferred to the pressure part A of the hot water storage tank 1 via the heat exchanger 2. The water temperature detecting devices 7 and 1 are configured to boil water in the hot water tank 1 in a stratified manner sequentially from the upper part A by natural circulation, and are provided at the upper part A and the lower mouth of the hot water tank 1. The hot water storage type hot water supply is configured such that the amount of heating by the heat exchanger 2 can be selectively set by providing a control circuit A that can control the heating action of the heat exchanger 2 based on the temperature detection result obtained by . The control circuit A comprises an automatic return type operation switch SW1, a relay X that closes contacts XA and XA when the automatic return type operation switch SW1 is turned on, and a contact of the relay X. In the closed state of XA, Contact point of X
When A and XA are in the open state, both water temperature detection devices 7 and 7'
A fuel control electromagnetic valve 9 is provided which operates to exert the heating effect of the heat exchanger 2 when both contacts 7A and 7A' detect that the water temperature is below the set water temperature. , and the automatic return type operation switch SW.
1, the heating action of the heat exchanger 2 is continued until the water temperatures detected by both the water temperature detectors 7 and 7' provided at the upper and lower ports of the hot water storage tank 1 reach the set temperature, Then, after that, the water temperature detection device 7 installed at the upper part A of the hot water storage tank 1 detects water temperature, where the detected water temperature reaches the set temperature earlier than the water temperature detection device 7' installed at the lower opening of the hot water storage tank 1. A hot water storage type water heater characterized in that the heating action of the heat exchanger 2 is stopped as soon as the water temperature reaches a set temperature.