JPS5960146A - Hot water supplier with additional heating function of bath - Google Patents

Abstract

PURPOSE:To prevent the bath water from flowing back to a service water pipe and also to prevent coils from sustaining damage due to the idling of a circulating water pump by providing a water level detector which detects the lowering of the water level due to leakage of water and stops the operation of the circulating water pump, at the upper part of a water heater. CONSTITUTION:A vacuum breaker 28 is mounted on a vacuum breaker mounting pipe 27 disposed at the upper surface part of the water heater 15 in the proximity of a water supply opening 13. Further, in a case where a negative pressure takes place in the hot water supply can body 15, the vacuum breaker 28 sucks up air from the outside to make the internal pressure of the water heater 15 an atmospheric pressure. Further, the vacuum breaker is located at a position upper than by a dimension H than the position of an outlet 30 from the water heater 15 to the circulation circuit 20 and mounted at the upper side wall of the water heater 15, and a water level detector 29 detects the lowering of the water level within the water heater 15 due to water leakage from the heat exchanger 22 to stop the operation of circulating pump 24.

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.

Structure of conventional example and its problems As shown in Fig. 1, this type of conventional hot water heater with a bath reheating function heats water in a hot water supply can body 2 using a combustion device 1, and then uses the heated hot water to The water is passed through a branched circulation circuit 5 from a hot water supply pipe 4 connected to the hot water supply port 3 of the hot water supply can body 2, and the bath water in the bath 6 is indirectly heated by a heat exchanger 7 installed in the middle of this circulation circuit 6. It was configured to do so.

However, in this configuration, when a hole occurs in the heat exchanger 7, negative pressure is generated in the hot water can 2 due to a water outage in the water pipe 10 connected to the water supply [9] of the hot water can 2. In this case, the bath water in the bath 6 flows through the circulation circuit 5 through the hole in the heat exchanger 7.
As a result, there is a problem in that the bath water flows back into the water pipe 1o 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 heat exchanger that eliminates the risk of the bath water in the bath flowing back into the water pipes even if a hole occurs in the heat exchanger for indirect heating of the bath. 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-mentioned object, the present invention is located above the outlet position from the hot water supply can to the circulation circuit, and is installed in the upper part of the hot water supply can to prevent water leakage from the heat exchanger from occurring inside the hot water supply can. This system is equipped with a water level detector that detects a drop in the water level and stops the operation of the circulation pump. According to this configuration, when a hole occurs in the heat exchanger, the hot water tank body will be damaged due to a water outage, etc. Even if negative pressure occurs, air can be sucked in through the vacuum breaker valve to bring the internal pressure of the hot water tank to atmospheric pressure. It will no longer be sucked in through the holes and flow back into the water pipes, and due to the atmospheric pressure sucked in from the vacuum breaker valve, if the water level inside the hot water tank falls to the point where it overflows the bath, it will no longer be sucked in through the holes in the heat exchanger. Water leaks continue, but in this case, the water level detector is exposed to the atmosphere as the water level inside the hot water tank decreases, detects the water leak, and stops the operation of the circulation pump. The detector is located above the outlet position from the hot water supply can to the circulation circuit, so when the water level detector detects water leakage from the hole in the heat exchanger and stops the operation of the circulation pump. In this case, the outlet position from the hot water tank to the circulation circuit is still underwater, so the circulation pump no longer runs dry, and as a result, the circulation pump coil It is also possible to prevent the problem of damage due to abnormal heating.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, the main body of the 11C water heater is provided with a hot water inlet 12 and a water inlet 13 on the upper surface, and two bath connection ports 14 on the lower side. In Fig. 3, 15 is a hot water supply can body, and the water inside is supplied to the combustion device 1.
It is heated by 6. This hot water can body 1
A hot water supply pipe 17 is connected to the hot water supply port 12 provided on the upper surface of 5, and a safety valve 1 is installed in the middle of the hot water supply 'It17.
There are 8. A water supply port 13 provided on two sides of the shunted hot water supply can 16 is connected to a water pipe 19.

2Q is a circulation circuit provided in communication with the hot water supply can 15, and in the middle of this circulation circuit 2Q, d: is provided a heat exchanger 22 that indirectly heats the bath water in the bath 21. This heat exchanger 22 is installed inside a heat exchange case 23,
This heat exchange case 23 is communicated with the bath 21 via the two bath connection ports 14. 24 is the circulation circuit 2
This circulation pump 24 is provided at the inlet 11R11 of the heat exchanger 22 at 0, and this circulation pump 24 circulates hot water in the hot water supply can 15 via the circulation circuit 20. 25 is 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.

Reference numeral 27 denotes a vacuum breaker valve mounting pipe provided on the upper surface of the water supply can 15 near the water supply IZ 113, and a vacuum breaker valve 28 is connected to this mounting pipe 27.
When negative pressure is generated in the hot water supply can 15 due to a water outage in the water pipe 19, etc., air is sucked in from the outside to bring the internal pressure of the hot water supply can 15 to atmospheric pressure. 29 is the circulation circuit 2
Outlet 30 from the hot water supply can 15 to the circulation circuit 20 at 0
The water level detector 2 is mounted on the upper side wall of the hot water supply can body 16 and positioned above the H dimension.
9 detects a drop in the water level in the hot water supply can 16 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 is activated by the operation of the water level detector 29 to cause the heat exchanger 22 to
This is to notify you of water leakage. 32 is the circulation circuit 20
This return port 32 is located on the lower side wall of the hot water supply can 15 and is located toward the lid of the combustion device.

The operation in the above configuration will be explained. 1. When a hole occurs in the heat exchanger 22 and negative pressure occurs in the hot water supply can 15 due to a water outage in the water pipe 19, etc. Since the vacuum break valve 28 provided on the top of the hot water tank body 15 opens and sucks in the atmosphere, this atmosphere can instantly bring the internal pressure of the hot water tank body 15 to atmospheric pressure. There is a water head difference between the hot water supply can body 16 and the bath 21, and the water level in the hot water supply can body 15 is higher than the water level in the bath 21, so the hot water in the hot water supply can body 15 undergoes heat exchange due to the water head pressure. It is pushed out into the bath 21 through the hole in the vessel 22, so there is no possibility that the bath water in the bath 21 will flow back into the hot water can 15 through the hole in the heat exchanger 22. The water leakage from the heat exchanger 22 continues to the overflow surface 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 caused by the overflow of the bath 21. When the surface A is 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 in the hot water can 15 Water Supply 1" 13 Position Since the water supply is located above the orpenlow surface A of the bath 21, the bath water in the bath 21 will not flow back into the water pipe 19.

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 a warning buzzer or display lamp 31, and also starts the operation of the circulation pump 24. to stop. In this case, the water level detector 29 is connected to the outlet 3o from the hot water supply can body 15 to the circulation circuit 2o.
Since the water level detector 29 is located above the position of It is possible to operate and stop the operation of the circulation pump 24 before the outlet 30 to the circulation circuit 20 is exposed to the atmosphere, thereby preventing the circulation pump 24 in the circulation circuit 20 from sucking air and running dry. can be prevented.

Effects of the Invention As described above, according to the present invention, when a hole occurs in the heat exchanger of the circulation circuit that communicates with the hot water supply can, negative pressure is generated in the hot water supply can due to a water outage in the water pipe, etc. However, since the internal pressure of the hot water tank can be brought to atmospheric pressure by sucking in air through the vacuum breaker valve, the bath water in the bath or the negative pressure of the hot water tank can be sucked in through the holes in the heat exchanger and leak into the water pipes. There will be no backflow. The water level detector, which detects water leakage from small holes in the heat exchanger and stops operation of the circulation pump, is located above the outlet from the hot water tank to the circulation circuit. The detector operates to 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 is the same water heater. FIG. 12...Hot water inlet, 13...Water inlet, 15
・・・・・・Hot water can body, 16 ・・・Combustion device, 19・
...Water pipe, 20...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] A hot water supply can has a water supply inlet and a hot water supply inlet to which water pipes are connected, and the water inside is heated by a combustion device, and a hot water supply can is provided so as to communicate with this hot water supply can, and a bath in the bath is installed in the middle. A circulation circuit is provided with a heat exchanger that indirectly heats water and a circulation pump, and a vacuum break valve is provided in the upper part of the hot water supply can, and above the outlet position from the hot water supply can to the circulation circuit. A water heater with a bath reheating function, which is located at the top of the hot water can and is equipped with a water level detector that detects a drop in the water level inside the hot water can due to water leakage from the heat exchanger and stops the operation of the circulation pump.