JP2512794B2 - Water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water supply device for home use and the like.

(Prior Art) For example, in a hot water supply device for home use, there are a conventional single pipe system and a double pipe circulation system as a piping system from the water heater to the hot water supply unit.

The single pipe hot water supply device is one in which the water heater and the hot water supply unit are simply connected by hot water supply pipes.This system has a simple configuration, but even if the hot water supply is started by opening the hot water outlet, immediately There is a drawback in that hot water at a predetermined temperature cannot be obtained, and the water is kept waiting until the residual water in the pipe comes out.

Further, in the conventional circulation type hot water supply device s, for example, as shown in FIG. 3, a hot water storage tank c is provided between a water heater a and a hot water outlet b, and the water heater a, the hot water storage tank c, and the hot water storage tank c are connected to each other. A hot water circulation system d, d'provided with circulation pumps p, p ', respectively, is formed between the hot water outlet section and a hot water storage tank c, and a water supply pipe e connected to the water supply is connected. In such a structure, when the hot water is not used, the water in the hot water storage tank c is
While being heated to a predetermined temperature by the heat exchanger f of the water heater a via the hot water circulation system d, the water in the pipe g of the hot water circulation system d'is also maintained at a predetermined temperature by circulation.

Then, the water in the pipe g flows out immediately after starting the hot water supply by opening the hot water outlet h, but the water in the pipe g is maintained at a predetermined temperature by the circulation as described above.
Immediately after tapping, hot water of a predetermined temperature can be obtained. still,
During such hot water supply, the operation of the circulation pump p'of the hot water circulation system d'is stopped, and the clean water corresponding to the amount of hot water discharged is supplied to the water supply pipe e.
From the hot water storage tank c.

(Problems to be Solved by the Invention) In the conventional circulation type hot water supply device s, as described above, the hot water storage tank c and the two circulation pumps p, p ′ are required.
There is a problem in that it is an obstacle to downsizing of the device and the cost is high. In addition, the conventional circulation type hot water supply device s
Then, since the water heater a and the hot water circulation system d, d ′ are integrally designed and configured, it is necessary to newly design for each hot water supply capacity, which makes it difficult to quickly respond to the request and raises the cost. There is a problem of coming.

The present invention is intended to solve the above problems.

(Means for Solving the Problem) The structure of the present invention is as follows. First, a heat exchanger for introducing and heating water, a burner for heating the heat exchanger, and a water inlet side of the heat exchanger. An inlet water amount detector and an inlet water temperature detector provided, a water heater comprising an outlet water temperature detector provided on the outlet side of the heat exchanger, and an outgoing pipe for sending water heated by the water heater to the outlet. , A hot water supply part comprising return piping for returning water to the hot water supply device again, a hot water supply forward pipe for connecting a water outlet side of the hot water supply device and a forward pipe of the hot water supply part, and a double pipe of the hot water supply part A hot water supply return pipe for connecting the water inlet side of the water heater, a circulation pump provided in the hot water supply return pipe for circulating water with the return pipe side as the upstream side, and a check provided downstream of the circulation pump. A valve, a water pipe for supplying clean water, a running water detector for detecting running water of the clean water, and A water supply system consisting of a check valve provided on the downstream side of the flow detector is provided on both the hot water supply circulation unit that is joined to the hot water supply return pipe on the downstream side of the check valve, and on both the water heater and the hot water supply circulation unit. The control device cooperates to perform control, and the control device includes the hot water supply device, the hot water supply circulation unit, and
When water is circulated in the circulation path constituted by the hot water supply unit, the temperature of the circulating water is detected by the water temperature detector, the burner is burned, and the heat exchanger is heated to circulate. The temperature of the water to be supplied is detected by the water temperature detector and controlled to a predetermined temperature, and when the supply of clean water is detected by the water flow detector, the circulation pump is stopped and the burner is operated. Is heated to heat the heat exchanger, and at this time, the water from the water supply system is detected by the water temperature detector and is controlled to a predetermined temperature by a hot water supply device configured to discharge water from the hot water outlet. is there.

Further, the configuration of the present invention, a heat exchanger for introducing and heating water, a burner for heating the heat exchanger, a water input amount detector and water temperature detection provided on the water input side of the heat exchanger. Water heater, a water heater comprising an outlet water temperature detector provided on the water outlet side of the heat exchanger, an outgoing pipe for sending water heated by the water heater to a hot water outlet, and water is returned to the water heater again. For connecting the hot water supply section for connecting the water discharge side of the water heater and the forward piping of the hot water supply section, and the return piping of the hot water supply section and the water input side of the hot water supply section Hot water return pipe, a circulation pump provided in the hot water return pipe, which circulates water with the return pipe side as an upstream side, a flow rate detector and a check valve provided downstream of the circulation pump, and clean water. A water supply system consisting of a water supply pipe for supplying water and a check valve is connected to the hot water return pipe downstream of the check valve. The hot water supply circulating unit is made to flow, and the control device is provided in both the hot water supply device and the hot water supply circulation unit to perform cooperative control, and the control device is the hot water supply device in the circulation pump, the hot water supply circulation unit, When water is circulated in the circulation path configured by the hot water supply unit, the temperature of the circulating water is detected by the water temperature detector to burn the burner to heat the heat exchanger,
The circulating water temperature detector is used to detect the temperature of the circulating water and control it to a predetermined temperature, and when there is a difference between the detection signals of the incoming water amount detector and the flow rate detector, the circulation pump And heat the heat exchanger by burning the burner, and at this time, the water from the water supply system is detected by the water temperature detector and controlled to a predetermined temperature to discharge water from the hot water outlet. It is a hot water supply device configured to be.

(Operation) When the hot water is not discharged from the hot water outlet, the circulation pump causes water to circulate in the circulation path constituted by the water heater, the hot water circulation unit, and the hot water supply section. The temperature of the circulating water is detected by the incoming water temperature detector, and if it is lower than a predetermined temperature, the burner is burned to heat the heat exchanger, and the circulating water is detected by the incoming water temperature detector. When the temperature reaches a predetermined level, the burner combustion is stopped and the circulating hot water is kept warm.

When the hot water supply port is opened and tapping is started, the hot and cold water in the circulation path is maintained at a predetermined temperature and circulates, so hot water at the desired temperature is immediately discharged, and the hot and cold water in the circulation path is tapped from the water pipe. When the clean water enters the circulation path and the flowing water detector provided in the water supply system confirms the flowing water, the circulation pump is stopped to prevent the hot water supply operation and the hot water supply circulation operation from interfering with each other.

The clean water that has entered the circulation path is heated through the heat exchanger by the combustion of the burner, and the outlet water temperature detector installed on the outlet side of the heat exchanger detects the temperature of the water from the heat exchanger to obtain the desired temperature. The water, which is controlled so as to reach the temperature, is newly introduced from the water supply pipe, heated to a desired temperature, and discharged from the tap hole.

In addition, the start of hot water discharge by opening the hot water supply port can be detected even when there is a difference between the detection signals of the water input amount detector provided in the start water heater and the flow rate detector provided in the hot water return pipe. In this case, the circulation pump is stopped in the same manner as described above, and the water introduced into the circulation path is heated by the heat exchanger to be discharged from the tap hole.

(Embodiment) As described above, the hot water supply apparatus of the present invention has the pipe 14 between the corresponding connection ports 4h, 5h; 4c, 5c of the water heater 1 and the hot water circulation unit 2.
While connecting with h and 14c, forward pipe 6h and return pipe 6 of hot water supply unit 3
c is connected to the hot water supply connection port 7h and the hot water supply dual connection port 7c of the hot water supply circulation unit 2, respectively, and the hot water supply device 1 to the hot water supply circulation unit 2 are connected.
To the hot water supply unit 3, and from the hot water supply unit 3 to the hot water supply unit 1 via the hot water supply circulation unit 2 to form a hot water supply circulation system H, and the water supply pipe 15 is connected to the water supply connection port 8 of the hot water supply circulation unit 2.
Is connected to form a water supply system C from the water supply to the confluence position P. Since the units are connected in this way, the water heater 1 is an existing one and the capacity is appropriately selected. The common hot water supply circulation unit 2 can constitute a wide variety of hot water supply devices. Of course, it goes without saying that the newly constructed water heater 1 can be used.

The hot water supply apparatus configured as described above will be described based on the embodiment shown in FIGS. 1 and 2.

First, when hot water is not supplied from the hot water outlet 20 or the like of the hot water supply unit 3, the water is not supplied from the water pipe 10, and in this state, the circulation pump 11 is operated to form the hot water circulation system H. While circulating the water in the pipe, the burner 22 is controlled according to the temperature of the circulating water detected by the incoming water temperature detector 21 provided in the water heater 1 or the like to maintain the water temperature passing through the heat exchanger 23 at a predetermined temperature. . In the above, the circulation pump 11 may be operated continuously or intermittently at predetermined time intervals.

Then, when the hot water outlet 20 is opened and hot water supply is started, an amount of clean water commensurate with the hot water supply amount is supplied from the water supply through the water supply system C to the hot water supply circulation system H from the confluence position P, and in such a state, The operation of the circulation pump 11 is stopped and the burner 23 is operated. The tap water supplied into the hot water supply circulation system H does not flow in this direction because of the check valve 12, and all flows toward the heat exchanger 23 of the water heater 1 and is heated in the heat exchanger 23. After that, the hot water supply circulation system H reaches the hot water supply unit 3 from the hot water supply device 1 through the hot water supply circulation unit 2 again, where the hot water outlet is provided.
Take a hot spring from 20. At this time, immediately after starting the hot water supply by opening the hot water outlet 20, the residual water in the pipe downstream of the heat exchanger 23 in the hot water supply circulation system H first comes out. Since the temperature is maintained at the predetermined temperature by the circulation described above, hot water of the predetermined temperature can be obtained immediately after tapping, and after all residual water is tapped, it is newly supplied and desired in the heat exchanger 23. The tap water heated to the temperature comes out. In FIGS. 1 and 2, reference numeral 24 is an outlet water temperature detector, and the burner 22 is appropriately controlled by the outlet water temperature detector 24, the water inlet amount detector 19 and the like, for example, proportional control. Thus, the hot water outlet temperature from the hot water outlet 20 can be controlled to a desired value.

As described above, the hot water supply circulation system H by the circulation pump 11
The hot water supply circulation operation is performed when the presence or absence of hot water in the hot water supply unit 3 is detected and is performed when there is no hot water. The control for detecting the presence or absence of hot water can be performed by the following method.

First, the method shown in FIG. 1 is a method of controlling the circulation pump 11 at an appropriate position of the water supply pipe 10 according to a signal from the water flow detector 16. The hot water supply in the hot water supply unit 3 corresponds to the water supply from the water supply pipe 10 to the hot water supply circulation system H. Therefore, when this water supply is detected, the hot water circulation operation by the circulation pump 11 is stopped so that the hot water is supplied. The inconvenience of interference between the hot water supply operation and the hot water supply circulation operation can be prevented.

Next, according to the method shown in FIG. 2, the flow rate detector 17 is provided in the hot water return pipe 9c, and the water input amount detector 19 is provided in the water supply pipe 18 of the hot water supply device 1.
Is provided, and the circulation pump 11 is controlled according to the difference between the flow rate detection signals of the respective flow rate detection means 19, 17. When water is supplied from the water supply pipe 10 to the hot water supply circulation system H by the hot water supply in the hot water supply unit 3, the confluence position P is detected by the water input amount detector 19.
Since the flow rate on the downstream side is higher than the flow rate on the upstream side, a difference occurs between the respective flow rate detection signals, and when this difference is detected, the hot water supply circulation operation by the circulation pump 11 is stopped, The inconvenience of interference between the operation and the hot water supply circulation operation can be prevented.

In the hot water supply apparatus of the present invention, both the hot water supply device 1 and the hot water supply circulation unit 2 require control means 25, 26 and power supply means (not shown), but the latter is, of course, It is easy to connect the former control means 25 and 26 with a connector 27 or the like, and control them by a communication purpose between them.

(Effects of the Invention) The effects of the present invention are as follows.

a) A hot water storage tank that was necessary in the conventional configuration,
A circulating hot water supply system can be configured without the need for one of the two pumps, and hot water of a predetermined temperature can be obtained immediately after tapping while satisfying the simplification and downsizing of the configuration. A device may be provided.

b) According to the present invention, such a water heater comprises a water heater, a hot water circulation unit, and a water heater, and these are connected by pipes. It is possible to configure a wide variety of water heaters by setting to, and existing water heaters can be used.

c) It is possible to stop the circulation pump and prevent the trouble of interference between the hot water supply operation and the hot water supply circulation operation by detecting that the tap water from the hot water outlet flows into the circulation system by using a flow rate detector or the like. it can.

d) The hot and cold water in the circulation path is maintained at a predetermined temperature in the circulation path by appropriately controlling the combustion of the burner based on the temperature detection by the incoming water temperature detector. In addition, the hot water flowing into the circulation path is burned and controlled by the burner based on the temperature detected by the outlet water temperature detector, whereby stable hot water discharge can be performed.

[Brief description of drawings]

1 and 2 are system diagrams showing an embodiment corresponding to each configuration of the present invention, and FIG. 3 is a system diagram of a conventional example. Reference numeral 1 ... Hot water supply device, 2 ... Hot water supply circulation unit, 3 ... Hot water supply unit,
4c ... water supply inlet connection port, 4h ... hot water supply outlet connection port, 5c ... water supply outlet connection port, 5h ... hot water supply inlet connection port, 6h ... outward piping, 6c ... return pipe, 7h ... hot water supply forward connection port, 7c ... hot water return connection Mouth, 8 ... Water supply connection port, 9h ... Hot water supply forward pipe, 9c ... Hot water supply return pipe, 10 ... Water supply pipe, 11
… Circulation pump, 12, 13… Check valve, 14h, 14c… Piping, 15… Water pipe, 16… Flow detector, 17… Flow detector, 18… Water supply pipe, 19… Water flow detector, 20… Out Gate, 21 ... Inlet water temperature detector, 22 ... Burner, 23 ... Heat exchanger, 24 ... Outlet water temperature detector, H
… Hot water circulation system, C… Water supply system, P… Confluence position.

Claims (2)

(57) [Claims] 1. A heat exchanger for introducing and heating water, a burner for heating the heat exchanger, a water amount detector and a water temperature detector provided on the water inlet side of the heat exchanger. A water heater comprising an outlet water temperature detector provided on the outlet side of the heat exchanger, and an outgoing pipe for sending water heated by the water heater to the outlet.
A hot water supply section comprising return piping for returning water to the hot water supply apparatus again, a hot water supply forward tube for connecting the water outlet side of the hot water supply apparatus and the forward piping of the hot water supply section, the return piping of the hot water supply section, and the A hot water supply return pipe for connecting the water inlet side of the water heater, a circulation pump provided in the hot water supply return pipe for circulating water with the return pipe side as an upstream side, and a check valve provided downstream of the circulation pump. And a water supply pipe for supplying clean water, a flowing water detector for detecting flowing water of the clean water, and a water supply system including a check valve provided on the downstream side of the flowing water detector, the downstream side of the check valve. The hot water supply circulation unit merged with the hot water supply return pipe, and a control device provided in both the hot water supply device and the hot water supply circulation unit to perform cooperative control, the control device including the hot water supply device in the circulation pump. , A hot water circulation unit, and a hot water supply part When circulating, the temperature of the circulating water is detected by the inlet temperature detector, the burner is burned to heat the heat exchanger, and the temperature of the circulating water is detected by the inlet temperature detector. When the supply of clean water is detected by the flowing water detector, the circulation pump is stopped and the burner is burned to heat the heat exchanger. ,On this occasion,
A hot water supply apparatus characterized in that water from the water supply system is detected by the water temperature detector and is controlled to a predetermined temperature to be discharged from the hot water outlet. 2. A heat exchanger for introducing and heating water, a burner for heating the heat exchanger, a water amount detector and a water temperature detector provided on the water inlet side of the heat exchanger. , A water heater comprising an outlet water temperature detector provided on the outlet side of the heat exchanger, an outgoing pipe for sending water heated by the water heater to a hot water outlet, and for returning the water to the water heater again A hot water supply unit configured by return piping, a hot water supply forward pipe for connecting a water outlet side of the water heater and a forward pipe of the hot water supply unit, and a hot water supply for connecting a return pipe of the hot water supply unit and a water inlet side of the water heater A return pipe, a circulation pump that is provided in the hot water supply return pipe and circulates water with the return pipe side as an upstream side, a flow rate detector and a check valve that are provided on the downstream side of the circulation pump, and supplies clean water. Perform a water supply system consisting of a water pipe and a check valve to join the hot water supply return pipe downstream of the check valve. It comprises a hot water supply circulation unit and a control device provided in both the hot water supply device and the hot water supply circulation unit to cooperate with each other, and the control device uses the circulation pump to provide the hot water supply device, the hot water supply circulation unit and the hot water supply unit. When water is circulated in the circulation path constituted by, the temperature of the circulating water is detected by the inlet temperature detector to burn the burner to heat the heat exchanger, thereby circulating the water. The temperature is detected by the water temperature detector and controlled to a predetermined temperature, and when there is a difference between the detection signals of the water amount detector and the flow rate detector, the circulation pump is stopped and The burner is burned to heat the heat exchanger, and at this time, the water from the water supply system is detected by the water temperature detector and is controlled to a predetermined temperature to be discharged from the hot water outlet. Characterized by Hot water system.