JPS6364701B2 - - 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, if a hole occurs in the heat exchanger 7, as shown in FIG. 1, when the circulation pump 8 is located on the outlet side of the heat exchanger 7, Therefore, the bath water in the bath 6 is sucked into the hot water supply can 2, and on the other hand,
Even if the circulation pump 8 is installed on the inlet side of the heat exchanger 7, if negative pressure occurs in the hot water can 2 due to a water outage in the water pipe 10 connected to the water inlet 9 of the hot water can 2, the heat The bath water in the bath 6 is sucked into the circulation circuit 5 through the hole in the exchanger 7. Therefore, in any of the above cases, the bath water flows back into the water pipe 10 through the can body 2. There was a problem that it contaminated tap water.

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention has a bath reheating function that prevents the bath water from 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 provide water heaters.

Structure of the Invention In order to achieve the above object, the present invention provides a circulation pump and a vacuum breaker valve on the inlet side of a heat exchanger in a circulation circuit provided to communicate with the hot water supply can, and The position of the water supply inlet, the position of the outlet from the hot water supply can to the circulation circuit, and the position of the vacuum breaker valve are set above the overflow surface of the bath. According to this configuration, under normal and operating conditions, no heat is generated. Since the exchanger is pressurized by the tap water pressure and the pressurization of the circulation pump, if a hole occurs in the heat exchanger, the hot water inside the hot water tank will be forced out into the bath through the hole in the heat exchanger. Become,
As a result, the bath water in the bath will no longer flow back into the hot water supply can through the holes in the heat exchanger. Also, when there is a hole in the heat exchanger,
If negative pressure occurs in the hot water tank due to a water outage, etc., air can be sucked in from the vacuum breaker valve to bring the internal pressure of the hot water tank to atmospheric pressure. Therefore, it is possible to prevent bath water from being sucked in through the holes in the heat exchanger and flowing back into the water pipes.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, reference numeral 11 denotes a main body of the water heater, which has a hot water supply port 12 on its upper surface and two bath connection ports 13 on its lower side. In FIG. 3, 14 is a hot water supply can, and the water inside is heated by a combustion device 15. A water supply port 17 that communicates with the water pipe 16 is provided on the upper side surface of the hot water supply can body 14, and the hot water supply port 12 is provided on the top surface.
The hot water supply pipe 18 is connected to the hot water supply pipe 1.
A safety valve 19 is provided in the middle of the valve 8. Reference numeral 20 denotes a circulation circuit provided so as to communicate with the hot water supply can 14, and a heat exchanger 22 for indirectly heating the bath water in the bath 21 is provided in the middle of this circulation circuit 20. This heat exchanger 22 is connected to a heat exchange case 23.
The heat exchange case 23 is connected to the bath 21 through the two bath connection ports 13. 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. Reference numeral 25 denotes a drain pipe attached to the lower side wall of the hot water supply can 14 at a position below the combustion device 15, and a drain plug 26 is provided in the middle.

27 is a heat exchanger 22 in the circulation circuit 20
This vacuum breaker valve 27 is a vacuum breaker valve installed on the inlet side of the water supply can body 14 due to water outage of the water pipe 16,
When a negative pressure is generated, air is sucked in from the outside to bring the internal pressure of the hot water supply can 14 to atmospheric pressure.
28 is the upper side wall of the hot water supply can body 14, and the water supply port 1
This water level detector 28 is installed at a position above 7, and this water level detector 28 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 29 denotes an alarm buzzer or indicator lamp, which notifies water leakage from the heat exchanger 22 by the operation of the water level detector 28. In addition, the hot water supply can body 14
The position of the water inlet 17 is set above the overflow surface A of the bath 21 by _H1 , and the position of the vacuum breaker valve 27 and the outlet 20a from the hot water supply can body 14 to the circulation circuit 20 is set above the overflow surface A of the bath 21.
It is set higher than _H2 . 20b is a return port from the circulation circuit 20 to the hot water supply can 14.

The operation in the above configuration will be explained. First, in the normal state, the heat exchanger 22 is in a pressurized state due to the pressurization of tap water pressure, so if a hole occurs in the heat exchanger 22, the hot water supply can 14 is heated through the hole in the heat exchanger 22. The hot water inside will be forced out into the bath 21, so the bath water in the bath 21 will not flow back into the hot water can 14 through the hole in the heat exchanger 22. Furthermore, while the circulation pump 24 is in operation, since the circulation pump 24 is located on the inlet side of the heat exchanger 22, the circulation pump 24 causes the heat exchanger 22 to
Therefore, if a hole occurs in the heat exchanger 22 during this operation, the hot water in the hot water supply can 14 will flow into the bath 21 through the hole in the heat exchanger 22. Because it will be pushed out, bath 21
There is no possibility that the bath water inside will flow back into the hot water supply can 14 through the holes in the heat exchanger 22.

In addition, if the water supply pipe 16 is cut off due to a hole in the heat exchanger 22 as described above, if the vacuum break valve 28 is not provided in the hot water can body 14, the inside of the water pipe 16 will be damaged. The pressure becomes negative, and hot water in the hot water can 14 is drawn in by this negative pressure, and at the same time, bath water flows into the hot water can 14 through the circulation circuit 20 from the hole in the heat exchanger 22, and further flows into the water pipe. 16 and contaminates it. However, in the present invention, the vacuum breaker valve 28 opens due to the pressure difference between the inside and outside, and the atmosphere enters the hot water can 14 from the outside, instantly bringing the inside of the hot water can 14 to atmospheric pressure, and creating an air layer inside the water pipe 16. , the above-mentioned backflow phenomenon can be avoided. At this time, there is a water head difference between the hot water supply can body 14 and the bath 21, and the water level in the hot water supply can body 14 is higher than the water level in the bath 21, so the hot water in the hot water supply can body 14 is caused by the water head pressure. Therefore, the bath water in the bath 21 will not flow back into the hot water can 14 through the holes in the heat exchanger 22. And this heat exchanger 22
Water leakage continues to the overflow surface A of the bath 21, where the water level of the bath 21 and the hot water supply can 14 are the same.When the water levels of the hot water supply can 14 and the bath 21 become the same at the overflow surface A of the bath 21, , the bath water in the bath 21 can mix into the hot water in the hot water can 14 through the hole in the heat exchanger 22, but in this case, the water supply port 17 of the hot water can 14 is located at Since the bath water in the bath ₂₁ is set above the overflow surface A by H1, the bath water in the bath 21 will not flow back into the water pipe 16.

In addition, while the water level in the hot water supply can body 14 is decreasing, the water level detector 28 detects the decrease in the water level and notifies you of the decrease in the water level with an alarm buzzer or display lamp 29, 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 heat exchanger is put into a pressurized state by tap water pressure and the pressurization of the circulation pump in the normal state and the operating state. If this occurs, the hot water in the hot water tank will be pushed out into the bath through the holes in the heat exchanger, and as a result, the bath water in the bath will flow back into the hot water tank through the holes in the heat exchanger. If the heat exchanger has a hole and negative pressure is generated in the hot water tank due to a water outage, etc., the internal pressure of the hot water tank is increased by sucking atmospheric air through the vacuum breaker valve. Since it can be made into air pressure, it is safe because it prevents the bath water from being sucked in through the heat exchanger hole and flowing back into the water pipes due to negative pressure in the hot water supply can. It is possible to obtain a high value.

[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. 12...Hot water supply port, 14...Hot water supply can body, 15...
Combustion device, 16...Water pipe, 17...Water inlet, 2
0... Circulation circuit, 20a... Outlet from the hot water supply can to the circulation circuit, 21... Bath, 22... Heat exchanger,
24...Circulation pump, 27...Vacuum breaker valve, 28
...Water level detector.

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 in which a heat exchanger for indirectly heating the bath water in the bath is provided in the middle, a circulation pump and a vacuum break valve are provided on the inlet side of the heat exchanger in the circulation circuit, and the hot water supply can A water heater with a bath reheating function in which the water supply inlet position of the body, the outlet position from the hot water supply can body to the circulation circuit, and the position of the vacuum break valve are set above the overflow surface of the bath.