JPS6364700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention circulates hot water in a hot water supply can through a circulation circuit including a heat exchanger using a circulation pump, thereby indirectly discharging bath water in a bath using the heat exchanger. The present invention relates to a water heater with a bath reheating function that heats the bath.

Conventional configuration and its problems This type of conventional water heater with bath reheating function is
As shown in FIG.
The bath water in the bath 6 is configured to flow from a hot water supply pipe 4 connected to a hot water supply port 3 to a branched circulation circuit 5, and to indirectly heat the bath water in the bath 6 with a heat exchanger 7 provided in the middle of this circulation circuit 5. Was.

However, in this configuration, when a hole occurs in the heat exchanger 7, the water supply port 9 of the hot water supply can body 2
If negative pressure occurs in the hot water tank body 2 due to a water outage in the water pipe 10 connected to As a result, there is a problem in that the bath water flows back into the water pipe 10 through the hot water supply can 2 and contaminates the tap water.

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention provides a water heater in which there is no risk of bath water in the bath flowing back into the water pipe even if a hole occurs in the heat exchanger for indirect heating of the bath. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention provides a water supply port of a hot water supply can on the top surface or an upper side surface of the hot water supply can, and a mounting pipe for a vacuum breaker valve located at or near the water supply port. According to this configuration, in the event of a hole in the heat exchanger or a water outage in the water pipes, the air sucked in from the vacuum breaker valve will instantly supply water over the shortest distance. Because the hot water is sucked into the mouth, there is no negative pressure in the hot water can, and as a result, the negative pressure in the hot water can causes the bath water in the bath to be sucked through the holes in the heat exchanger and flow back into the water pipes. It has an excellent effect in that it never happens.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In Fig. 2, 11 is the main body of the water heater, and the top surface has a hot water inlet 12 and a water inlet 1.
3, and two bath connection ports 1 at the bottom of the side.
There are 4. In FIG. 3, 15 is a hot water supply can, and the water inside is heated by a combustion device 16. A hot water supply pipe 17 is connected to the hot water supply port 12 provided on the upper surface of the hot water supply can body 15, and a safety valve 18 is installed in the middle of the hot water supply pipe 17.
has been established. Further, a water supply port 13 provided on the upper surface of the hot water supply can 15 is connected to a water pipe 19. 20 is a circulation circuit provided so as to communicate with the hot water supply can body 15, and in the middle of this circulation circuit 20,
Heat exchanger 2 that indirectly heats bath water in bath 21
2 are provided. This heat exchanger 22 is installed inside a heat exchange case 23, and this heat exchange case 2
3 is connected to the bath 21 via the two bath connection ports 14.
It communicates with A circulation pump 24 is provided on the inlet side of the heat exchanger 22 in the circulation circuit 20, and this circulation pump 24 circulates hot water in the hot water supply can 14 through the circulation circuit 20. 2
Reference numeral 5 denotes a drain pipe branched from between the circulation pump 24 and the inlet side of the heat exchanger 22, and a drain plug 26 is provided in the middle.

27 is a hot water supply can body 15 adjacent to the water supply port 13;
A vacuum breaker valve 28 is attached to the attachment pipe 27 of the vacuum breaker valve mounting pipe provided on the top surface, and this vacuum breaker valve 28 can be used to release air from the outside in the event of a water outage in the water pipe 19. This is to prevent the water supply can body 15 from becoming negative pressure by sucking in the air and allowing the air to be instantly sucked into the water supply port 13 over the shortest distance. 29 is located above the position of the outlet 30 from the hot water supply can 15 to the circulation circuit 20 in the circulation circuit 20 by the H dimension;
This water level detector 29 is attached to the upper side wall of the water heater 20. The water level detector 29 detects a drop in the water level in the hot water supply can 14 due to water leakage from the heat exchanger 22, and stops the operation of the circulation pump 24. Reference numeral 31 denotes an alarm buzzer or an indicator lamp, which notifies water leakage from the heat exchanger 22 by the operation of the water level detector 29. Reference numeral 32 denotes a return port from the circulation circuit 20 to the hot water supply can 15, and this return port 32 is located below the combustion device and is provided on the lower side wall of the hot water supply can 15.

FIG. 4 and FIG. 5 show other embodiments of the present invention, and the embodiment shown in FIG.
The water supply port 13 of FIG. The hot water supply can body 15 is connected to the water supply port 13 of
A vacuum breaker valve 28 is provided on the upper side of the
A mounting pipe 27 is provided near the water supply port 13, that is, at the top of the side surface of the hot water supply can body 15.

The operation in the above configuration will be explained. heat exchanger 2
If the water supply pipe 16 has a water outage due to a hole in the water supply pipe 2, if the vacuum breaker valve 28 is not provided in the hot water supply can body 15, the inside of the water pipe 19 will become negative pressure.
This negative pressure draws hot water in the hot water can 15, and at the same time, bath water flows from the hole in the heat exchanger 22 into the hot water can 15 via the circulation circuit 20, and then flows back into the water pipe 19, causing contamination. I will do it. However, in the present invention, the vacuum breaker valve 28 provided at the top or top side of the hot water supply can 14 opens to suck in air. Since this air is instantly sucked into the water supply port 13 over the shortest distance, the hot water supply can body 15 will not become under negative pressure, and at this time, there is a water head difference between the hot water supply can body 15 and the bath 21. It was hot,
Since the water level in the hot water supply can 15 is higher than the water level in the bath 21, the hot water in the hot water supply can 15 is pushed out into the bath 21 through the hole in the heat exchanger 22 by the head pressure. Therefore, the bath water in the bath 21 will not flow back into the hot water supply can 15 through the hole in the heat exchanger 22. The water leakage from the heat exchanger 22 continues to the overflow surface A of the bath 21 where the water level of the bath 21 and the hot water supply can 15 are the same, and the water level of the hot water supply can 15 and the bath 21 is the same as that of the overflow surface A of the bath 21. When they become the same, heat exchanger 2
The bath water in the bath 21 flows through the hole 2 into the hot water supply can body 15.
In this case, the water supply port 13 of the hot water supply can body 15 is located at the position of the water supply port 13 in the bath 21.
Because it is located above the overflow surface A of
Bath water in the bath 21 will not flow back into the water pipe 19.

In addition, while the water level in the hot water supply can body 15 is decreasing, the water level detector 29 detects the decrease in the water level and notifies you of the decrease in the water level with an alarm buzzer or display lamp 31, and also stops the operation of the circulation pump 24. . In this case, the circulation pump 24 cannot be restarted unless the heat exchanger 22 is replaced or repaired. Since the bath water in 21 is drained from drain pipe 25,
This also eliminates the need for bath water to be reused.

Effects of the Invention As described above, according to the present invention, the water supply port of the hot water supply can to which the water pipe is connected is provided on the top surface or the upper side surface of the hot water supply can, and the mounting pipe of the vacuum breaker valve is connected to the water supply port. Or because it is installed near the water supply port,
In the event of a water outage in the water pipes due to a hole in the heat exchanger in the circulation circuit that communicates with the hot water supply can, the air sucked in from the vacuum breaker valve is instantly sucked into the water supply port over the shortest distance. As a result, there is no longer a negative pressure in the hot water supply can, and the bath water in the bath is sucked through the hole in the heat exchanger by the negative pressure in the hot water supply can and flows into the water pipe. This has the excellent effect of preventing backflow.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a water heater with a bath reheating function showing a conventional example, Fig. 2 is a perspective view of a water heater with a bath reheating function showing an embodiment of the present invention, and Fig. 3
The figure is a system configuration diagram of the water heater, and FIGS. 4 and 5 are partial configuration diagrams showing other embodiments of the present invention. 12...Hot water supply inlet, 13...Water supply inlet, 15...Hot water supply can body, 16...Combustion device, 19...Water pipe, 2
0... Circulation circuit, 21... Bath, 22... Heat exchanger, 24... Circulation pump, 27... Vacuum breaker valve mounting pipe, 28... Vacuum breaker valve.

Claims (1)

[Claims] 1 Has a water supply port and a hot water supply port to which water pipes are connected,
and a hot water supply can in which the water inside is heated by the combustion device, and a hot water supply can that is provided in communication with the hot water supply can;
and a circulation circuit including a heat exchanger and a circulation pump for indirectly heating bath water in the bath, the water supply port of the hot water supply can being provided on the top surface or the upper side of the hot water can, A water heater with a bath reheating function, in which a vacuum break valve attachment pipe is provided at or near the water supply port.