JPH0212492Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a water heater that can instantly supply hot water to a plurality of hot water supply points.

(Prior art) This type of conventional hot water supply device connects a plurality of hot water supply terminals to a common hot water circulation path, circulates and heats the hot water in the circulation path as appropriate, maintains it at a predetermined temperature, and instantaneously supplies hot water at multiple hot water points. I was able to access the hot springs. However, with this water heater, hot water at a uniform temperature is supplied to each hot water supply terminal, so in order to obtain hot water at different temperatures at each hot water supply point, a mixing faucet is placed at each hot water supply terminal and the hot water is mixed with water. Therefore, the hot water temperature must be adjusted for each hot water supply point, which complicates the piping construction to each hot water supply point.Also, the hot water in the circulation path is set at the highest hot water temperature set at each hot water supply point. At the same time, the temperature of the water must be maintained. For this reason, there was a problem in that a large amount of heating was required to maintain the temperature of the hot water in the circulation path.

Therefore, in Utility Application No. 60-56409, the applicant separately heated and kept warm the hot water in each circulation path that was branched to each hot water supply point, and installed an independent mixing valve in the middle of each circulation path for each hot water supply point. We proposed a water heater that can supply hot water at the desired temperature at each location.

(Problem to be solved by the invention) However, this water heater is equipped with a hot water pump and a cold water pump, and when hot water is supplied, both are operated and the temperature is adjusted by the mixing valve. When dispensing hot water at a high temperature, the water pump's discharge volume becomes smaller than its discharge capacity, resulting in overloaded and low-efficiency operation, which adversely affects the pump's durability.Furthermore, in the mixing valve, hot water and water are Since they are supplied by separate pumps, there is a problem in that if the discharge pressure of one pump fluctuates, the mixing temperature fluctuates.

In view of the above circumstances, the present invention aims to reduce the low efficiency operation of the pump and further improve the stability of the hot water temperature.

(Means for solving the problem) In order to achieve this objective, the present invention has the following configuration. In other words, a circulation path consisting of an outgoing pipe and a return pipe is branched between the water heater and multiple hot water taps, and each return pipe joins downstream from a solenoid valve installed in the middle, and a common connected to the water inlet side of the water heater through a circulation pump,
A mixing valve, a flow rate adjustment means, and a temperature detection means are interposed in each outgoing pipe, and a water supply waterway is provided that connects from the water supply source to the circulation pump and the water heater via the water supply pump, and the water supply waterway is connected to the circulation pump and the water heater. A sub-supply waterway is provided that branches from the downstream side of the water supply pump and connects to each of the mixing valves.

(Example) An example of the present invention will be described with reference to the drawings. The figure shows a schematic configuration of an embodiment of the present invention, in which 1 is a water heater, 2 is an outgoing pipe 4 and a return pipe 5 that are branched between the water heater 1 and a plurality of hot water taps 3. It is a circulation route consisting of. Each return pipe 5 joins at a proper place,
It is connected to the water inlet side of the water heater 1 through a common flow path with a circulation pump 6 interposed therebetween. A water supply channel 7 is connected from a water supply source 8 to a downstream side of the circulation pump 6 via a water supply pump 9 and a backflow prevention valve 10. The check valve 10 prevents the water discharged from the circulation pump 6 from flowing backward from the water supply channel 7 toward the water supply source 8 when the circulation pump 6 is in operation. Reference numeral 11 denotes a sub-water supply channel which branches from between the water supply pump 9 and the backflow prevention valve 10 of the water supply channel 7 and supplies water to the mixing valves 12 provided in the middle of each of the outgoing pipes 4, respectively. A flow rate adjustment means 13 and a temperature detection means 14 are arranged downstream of the mixing valve 12 of each outgoing pipe 4, and each mixing valve 12 and flow rate adjustment means 13 is connected to the other mixing valve 12 and the other flow rate adjustment means 13, respectively. It is designed to be controlled independently. Reference numeral 15 represents a solenoid valve provided in the middle of each of the return pipes 5.

In the hot water supply apparatus having such a configuration, the hot water temperature at each hot water tap 3 is set by a remote control device (not shown). When each hot water tap 3 is closed, the temperature set for each circulation path 2 is compared with the detected temperature of the temperature detection means 14, and if the detected temperature is lower than the set temperature, only the solenoid valve of the circulation path 2 concerned is 15 is opened, the circulation pump 6 is operated, and the hot water in the circulation path 2 is circulated and heated by the water heater 1. When the temperature detection means 14 detects the set temperature, the solenoid valve 15 is closed and the circulation pump 6 is stopped. In this way, each circulation path 2 is heated and kept at its respective set temperature independently of the other circulation paths 2.

When the hot water tap 3 is opened, hot water at the set temperature in the circulation path 2 is immediately drawn out, and the water pump 9 is operated, and the hot water heated by the water heater 1 is pumped through the mixing valve 12 from the auxiliary water supply channel 11. The hot water is appropriately mixed with the supplied water and discharged from the hot water tap 3. Thus, each of the plurality of hot water taps 3 can supply hot water at a desired temperature. At this time, each mixing valve 12 is supplied with hot water via the water heater 1 by a single water supply pump 9 and the sub-supply channel 11.
The load on the water supply pump 9 during hot water supply is stable regardless of whether the hot water is hot or cold, and since hot water and water are supplied at almost the same pressure, an extremely stable mixing temperature is obtained. be able to.

Furthermore, since the water supply pump 9 is used when hot water is supplied, and the circulation pump 6 is used only to heat and keep warm the hot water in each circulation path 2, the circulation pump 6 can be relatively small and is independent for each circulation path 2. Since the temperature is maintained at the set temperature, the running cost for heating and maintaining each circulation path 2 can be reduced.

(Effects of the invention) The invention has the following excellent effects. In other words, when hot water is supplied, the hot water supplied by a single water supply pump is mixed with cold water, so hot water can be dispensed at an extremely stable temperature, and the load state of the water supply pump is stable, so that low-efficiency operation is avoided. can be reduced.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram showing an embodiment of the present invention. 1...Water heater, 2...Circulation path, 3...Hot water tap,
6... Circulation pump, 7... Water supply channel, 9... Water supply pump, 11... Sub-supply channel, 12... Mixing valve, 13
...Flow rate adjustment means, 14...Temperature detection means, 15
……solenoid valve.

Claims (1)

[Scope of utility model registration request] A circulation path consisting of an outgoing pipe and a return pipe is branched between the water heater and multiple hot water taps, and each return pipe joins downstream from the solenoid valve installed in the middle to form a common circulation. It is connected to the water heater via a pump, and a mixing valve, a flow rate adjustment means, and a temperature detection means are interposed in each outgoing pipe, and the water is connected to the water supply source via the water supply pump between the circulation pump and the water heater. A hot water supply apparatus characterized in that a connecting water supply channel is provided, and a sub-supply channel is provided which branches from the downstream side of the water supply pump of the water supply channel and connects to each of the mixing valves.