JPS6364699B2 - - 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 is designed to prevent the bath water from flowing back into the water pipes even if a hole occurs in the heat exchanger for indirect heating of the bath, and to prevent the heat exchanger from flowing back into the water pipes. It is an object of the present invention to provide a water heater that can prevent damage to the coil due to idle operation of the circulation pump in the circulation circuit during abnormal operation due to a hole in the water heater.

Structure of the Invention In order to achieve the above object, the present invention provides a vacuum breaker valve in the upper part of the hot water supply can, and provides a vacuum breaker valve in the circulation circuit provided to communicate with the hot water supply can. A water level detector is installed at the top of the hot water tank, located above the outlet position, to detect a drop in the water level inside the hot water tank due to water leakage from the heat exchanger and stop the operation of the circulation pump.
According to this configuration, even if a hole occurs in the heat exchanger and negative pressure is generated in the hot water tank due to a water outage in the water pipes, etc., atmospheric air is sucked in from the vacuum breaker valve to reduce the internal pressure of the hot water tank. Since the water in the bath can be brought to atmospheric pressure, the negative pressure in the hot water supply can prevents the bath water from being sucked in through the heat exchanger hole and flowing back into the water pipes. Due to the atmospheric pressure, water continues to leak from the holes in the heat exchanger until the water level inside the hot water tank falls to the overflow surface of the bath. A detector is exposed to the atmosphere, detects water leakage, and stops operation of the circulation pump, and the water level detector is located above the outlet position from the hot water supply can body to the circulation circuit. Therefore, when the water level detector detects water leakage from the hole in the heat exchanger and stops operation of the circulation pump, the outlet position from the hot water tank body to the circulation circuit is still underwater, and therefore, The circulation pump will no longer run idly, and as a result, the problem of abnormal heating and damage to the circulation pump coil due to the idling of the circulation pump can be prevented. .

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 15 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. In this case, air is sucked in from the outside to bring the internal pressure of the hot water supply can 15 to atmospheric pressure. Reference numeral 29 denotes a water level detector mounted on the upper side wall of the hot water supply can 15 at a distance H dimension above the position of the outlet 30 from the hot water supply can 15 to the circulation circuit 20 in the circulation circuit 20; 2
9 is a hot water supply can body 15 due to water leakage from the heat exchanger 22
The system detects a drop in the water level within the pump and stops the operation of the circulation pump 24. Reference numeral 31 denotes an alarm buzzer or indicator lamp, which notifies water leakage from the heat exchanger 22 by the operation of the water level detector 29. 32 is a connection from the circulation circuit 20 to the hot water supply can body 1
This return port 32 is located below the combustion device and is provided in the lower side wall of the hot water supply can 15.

The operation in the above configuration will be explained. heat exchanger 2
2, if a negative pressure is generated in the water supply can 15 due to a water outage in the water pipe 19, etc., if the water supply can 15 is not equipped with a vacuum breaker valve 28, the inside of the water pipe 19 will become negative. This negative pressure causes the hot water in the hot water can 15 to be drawn in, and at the same time, the bath water flows from the hole in the heat exchanger 22 into the hot water can 15 via the circulation circuit 20, and further into the water pipe 19. It will flow back and cause contamination. However, in the present invention, the vacuum breaker valve 28 provided on the upper surface of the hot water supply can 15 opens to suck in the atmosphere, so this atmosphere causes the hot water supply can 1 to
At this time, there is a water head difference between the hot water supply can body 15 and the bath 21, and the water level in the hot water supply can body 15 is equal to that of the bath 2.
1, the hot water in the hot water supply can 15 is pushed out into the bath 21 through the hole of the heat exchanger 22 by the water head pressure, and therefore the bath water in the bath 21 is There is no possibility that the water will flow back into the hot water supply can 15 through the holes 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, the bath water in the bath 21 can mix into the hot water in the hot water can 15 through the hole in the heat exchanger 22, but in this case, the water inlet of the hot water can 15 1
Since the position 3 is above the overflow surface A of the bath 21, the bath water in the bath 21 flows into the water pipe 1.
It will not flow back to 9.

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 water level detector 29
5 to the circulation circuit 20, this water level detector 2
Reference numeral 9 indicates that the circulation pump 24 operates before the water level in the hot water supply can 15 drops due to water leakage from the hole in the heat exchanger 22 and the outlet 30 from the hot water supply can 15 to the circulation circuit 20 is exposed to the atmosphere. This can prevent the circulation pump 24 in the circulation circuit 20 from sucking air and running idly.

Effects of the Invention As described above, according to the present invention, when a hole occurs in the heat exchanger of the circulation circuit communicating with the hot water supply can,
Even if negative pressure occurs in the hot water can due to a water outage, etc., the vacuum breaker valve can suck in atmospheric air and bring the internal pressure of the hot water can to atmospheric pressure, so that the bath water in the bath will not reach the hot water can. The body's negative pressure will no longer cause it to be sucked in through the holes in the heat exchanger and flow back into the water pipes. In addition, the water level detector that detects water leakage from the holes in the heat exchanger and stops the operation of the circulation pump is located above the outlet position from the hot water tank body to the circulation circuit. The pump is activated and can stop the operation of the circulation pump before the water level in the hot water tank falls due to water leakage from the heat exchanger hole and the outlet from the hot water tank to the circulation circuit is exposed to the atmosphere. Therefore, it is possible to prevent the circulation pump in the circulation circuit from sucking air and running idle.

[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 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, 28...Vacuum breaker valve,
29...Water level detector, 30...Outlet from the hot water supply can body to the circulation circuit.

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 whose internal water is heated by a combustion device, and a hot water supply can which is provided so as to pass through the hot water supply can;
A circulation circuit is provided with a heat exchanger and a circulation pump that indirectly heats the bath water in the bath, and a vacuum break valve is provided in the upper part of the hot water supply can, and the circulation circuit is connected to the hot water supply can from the hot water supply can. A bath equipped with a water level detector located above the outlet of the hot water tank and installed on the top of the hot water tank to detect a drop in the water level in the hot water tank due to water leakage from the heat exchanger and stop the operation of the circulation pump. Water heater with additional heating function.