JPS5852134B2 - onsikisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater device having a double pipe structure consisting of an inner pipe and an outer pipe, and equipped with a heat exchanger equipped with a detection device for detecting leakage in the inner and outer pipes. be.

Figure 1 shows a bathtub using a conventional water heater.
2 is a water heater that heats the water filled inside the bathtub by a heater 16; 3 is a water heater that supplies water from a water source to the bathtub 1 through a water pipe 6; A water supply valve 4 is a hot water supply valve that supplies hot water from the water heater 2 into the bathtub 1 via a hot water pipe 5.

That is, in FIG. 1, first, the hot water in the water heater 2 is supplied into the bathtub 1 by the hot water supply valve 4, and this hot water and the water supplied by the water supply valve are mixed and brought to an appropriate temperature and used for bathing. However, if the temperature drops during use and it becomes necessary to reheat the water, a large amount of hot water will be required if new hot water is supplied from the water heater 2, so the temperature must be adjusted in advance. Because of the inconvenience of having to throw away the hot water that has decreased, conventionally a bathtub 1 that combines a water heater 2 and a reheating gas burner (not shown) has been generally used, but in recent years it has been used in high-rise buildings. This included problems such as restrictions being placed on the use of the reheating gas burner from the standpoint of safety.

In order to compensate for these problems, the hot water in the water heater 2 has a pipe shape for the high-temperature part and the low-temperature part, and the bath water and the hot water in the water heater 2 are sent by a pump and pass through the pipe. A water heater system equipped with a heat exchanger for reheating and a heat exchanger for exhaust heat recovery has been developed.

In this water heater device, when the need for reheating arises, the pump is driven and the flow direction of the bath water is switched to the reheating heat exchanger side by the valve means, and the bath water is transferred to the reheating heat exchanger. While the hot water is guided into the vessel and passes through the pipe, it exchanges heat with the high temperature part of the hot water in the water heater 2, becomes warm again, and returns to the bathtub 1.

Next, when you finish taking a bath or when the temperature of the bath water in the bathtub 1 is too high, you can drive the pump and switch the flow direction of the bath water to the heat exchanger for exhaust heat recovery using the valve means. In the heat exchanger for exhaust heat recovery, heat is exchanged between the bath water and the low temperature part of the hot water in the water heater 2, and in the case of hot water remaining after bathing, the waste heat is radiated to the low temperature part of the hot water in the water heater 2. Similarly, in the case of bath water whose temperature is too high for cold water, a part of the temperature is radiated to the low temperature part of the hot water in the water heater 2 to bring it to an appropriate temperature.

In other words, by attaching each heat exchanger that has reheating and exhaust heat recovery functions to the water heater, we have solved the problem of reheating, which is a problem with conventional equipment, and also made it possible to recover exhaust heat. However, in this water heater device, the pipes forming the heat exchanger are buried in the hot water inside the water heater, so there is a possibility that the pipes may become damaged due to corrosion, etc. If the tube were to break, there was a risk that the bath water would get mixed in with the hot water in the water heater, posing a hygienic problem.

The present invention has been made for the purpose of solving the problems remaining in the conventional apparatus.

Hereinafter, one embodiment of the water heater device of the present invention will be described in detail with reference to the drawings.

That is, in FIG. 2, a bathtub 1, a water heater 2, a water supply valve 3, a hot water supply valve 4, a hot water pipe 5, a water pipe 6, and a heater 16.
Since this was described in the explanation of the conventional device shown in FIG. 1, the details will be omitted.

7 is a heat exchanger for reheating, and as described later, it has a double pipe structure consisting of an inner pipe and an outer pipe that houses this inner pipe with a predetermined gap, and a part of this double pipe is It is buried in the high temperature part of the hot water in the water heater 2.

A heat exchanger 8 for recovering exhaust heat has the same structure as the heat exchanger 7 for reheating, and is buried in the low temperature section of the hot water in the water heater 2.

9 and 10 are leak detectors, which are installed in the outer tubes of the reheating heat exchanger 7 and the exhaust heat recovery heat exchanger 8, as will be described later, and detect changes in pressure within a predetermined gap between the inner tube and the outer tube. Detects leaks in the inner and outer tubes.

11 is a pump that circulates the bath water in the bathtub 1 to each of the heat exchangers 7 and 8, and 12 is a three-way valve that switches the flow of the bath water sent by the pump 11 to the desired heat exchanger 7-8 side. do the work.

13 is a pipe connecting the three-way valve 12 and the reheating heat exchanger 7; 14 is a pipe connecting the reheating heat exchanger 7 and the bathtub 1; and 15 is a pipe connecting the three-way valve 12 and the heat exchanger for exhaust heat recovery. Piping 17 connects the heat exchanger 8 for exhaust heat recovery and the bathtub 1.

Next, the operation of the device will be described based on this embodiment.

Hot water in the water heater 2 is supplied into the bathtub 1 via the hot water pipe 5 by operating the hot water supply valve 4, and is mixed with cold water supplied via the water pipe 6 by operating the water supply valve 3 to reach an appropriate temperature. It is used for bathing, but if the temperature of the bath water decreases during use and it becomes necessary to reheat it, the above 3.
When the directional valve 12 is switched to the piping A131111J and the pump 11 is driven, the bath water flows through the pump 11, the 3-way valve 12, the piping A13, the reheating heat exchanger 7, the piping B14,
By circulating in the normal path of the bathtub 1, the heat exchanger 7 for reheating repeatedly absorbs heat from the high temperature part of the hot water of the water heater 2, and the temperature returns to the original appropriate temperature, and when the pump 11 is stopped, the reheating action is completed.

Also, when you finish taking a bath or the temperature of the bath water is too high, switch the 3-way valve 12 to the pipe C15 side and turn off the pump 11.
When driven, the bath water flows through the pump 11.3 directional valve 12, pipe C15, exhaust heat recovery heat exchanger 8, pipe D17, bathtub 1
By circulating the hot water in the heat exchanger 8 for waste heat recovery to the low temperature part of the hot water in the water heater 2, the remaining hot water after bathing becomes cold water, and the hot water is heated for a predetermined period of time. When the temperature reaches an appropriate temperature and the pump 11 is stopped, the exhaust heat recovery action is completed.

FIG. 3 is a cutaway view showing the structure of the heat exchanger 7 and the leak detector 9, in which 71 is a U-shaped inner pipe connected to the piping 13, 14, and 72 is a U-shaped inner pipe connected to the pipe 13. The inner tube 71 and the outer tube 72 are inserted into the hot water inside the water heater 2.

18 is a gap 73 between the inner tube 71 and the outer tube 72 of the heat exchanger 7
The water filled inside 19 is a glass tube covered with a transparent shield tube 20, one end of which communicates with the predetermined gap 73, containing a part of the water filled inside, and the other end. is released into the air tank 201 inside the shield tube 20.

21 is colored oil floating on the top surface of the water contained in the glass tube 19.

These 1B, 19, 20° 21 are leak detectors 9,
10 and 71 and 72 constitute the heat exchanger 7.

Now, if we consider a case where a part of the inner pipe or outer pipe of each heat exchanger 7, 8 is torn, the pressure of hot water in the water heater 2 and the inner pipe of each heat exchanger 7, 8 while the circulation pump 11 is being driven are Since the pressure of the bath water inside the pipe is higher than atmospheric pressure, the leaked bath water or hot water passes through the predetermined gap between the inner pipe and the outer pipe and is detected by the leak detector 9,
The colored oil 21 is compressed while compressing the air in the glass tube 19 of 10.
Push up the surface.

Therefore, if an easy-to-understand mark is attached to the shield tube 20, it can be easily detected from the outside.

Furthermore, even if a leak occurs in either the inner tube or the outer tube, the bath water and hot water will not mix directly because of the double tube structure.

In short, the present invention involves inserting a heat exchanger with a double-tube structure consisting of an inner tube and an outer tube housing the inner tube through a predetermined gap into a water heater, and filling the predetermined gap with a medium. This system is equipped with a leak detector that detects internal pressure changes through the heat exchanger, making it possible to detect leaks in the inner and outer pipes of the heat exchanger. Eliminating the fear of direct mixing between hot water and the fluid flowing through each heat exchanger has significant practical safety and sanitary effects.

[Brief explanation of drawings]

Figure 1 is a flow diagram showing the configuration of a conventional water heater device;
The figure is a flow diagram showing the configuration of a water heater device according to an embodiment of the present invention, and FIG. 3 is a cutaway diagram of a heat exchanger according to an embodiment of the present invention. In the figure, 1 is a bathtub, 2 is a water heater, 3 is a water supply valve,
4 is a hot water supply valve, 5 is a hot water pipe, 6 is a water pipe, 7 is a heat exchanger for reheating, 8 is a heat exchanger for exhaust heat recovery, 9 and 10 are leak detectors, 11 is a pump, 12 is a 3-way valve, 13 is piping,
14 is piping, 15 is piping, 16 is heater, 17 is piping,
18 is water, 19 is a glass tube, 20 is a shield tube, and 21 is colored oil. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A bathtub, a water heater that supplies hot water to the bathtub, and an additional tube consisting of a U-shaped inner pipe and an outer pipe that surrounds the inner pipe with a predetermined gap, respectively, arranged at the upper and lower parts of the water heater. A heating heat exchanger and an exhaust heat recovery heat exchanger, a pump and a three-way valve for selectively circulating hot water in the bathtub through the inner tube, and a glass tube covered with a transparent shield tube. A water heater device comprising a leak detector that respectively detects pressure changes within the predetermined gaps via a medium filled in the gaps.