JP2546539B2 - Exhaust heat recovery device for bathhouse - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recovery device for effectively utilizing the exhaust heat of warm waste water from a bath or a bath.

[0002]

2. Description of the Related Art As an exhaust heat recovery apparatus described above, hot wastewater discharged from a washing place or bathtub of a bathhouse is temporarily stored in a water receiving tank, and hair, lint, dust, fat, etc. contained in the warm wastewater are collected. It is general that after removing the contaminants by a filter, the exhaust heat is recovered by pumping this to the primary flow path of the heat exchanger and exchanging heat with the fluid in the secondary flow path.

As the above heat exchanger, one having an excellent heat transfer coefficient is preferable. The plate heat exchanger, in particular, the permanently joined type (see Japanese Patent Application Laid-Open No. 1-503558) is particularly preferable in terms of heat transfer and simplicity.

[0004]

When a plate heat exchanger that can be disassembled or a plate heat exchanger that is permanently joined is used as an exhaust heat recovery device for a bath, even if it is hot waste water that has passed through a filter. Hair and lint remain without being completely removed, and hair and lint are easily caught at the primary flow path inlet of the plate heat exchanger. Etc. accumulate intensively. In such a case, in the case of a plate heat exchanger that can be disassembled, the tightening frame is removed, and the plates are disassembled into individual plates and cleaned by washing with water. It has to be time consuming and cannot be disassembled and removed in a permanently joined form. Further, when the fat content in the warm waste water was brought into contact with the air and solidified, it could not be removed at any time and clogged the primary flow path. Both of these cause a decrease in heat recovery efficiency,
An object of the present invention is to eliminate such inconvenience with a simple configuration.

[0005]

SUMMARY OF THE INVENTION According to the present invention, hot drainage discharged from a washing place or a bathtub of a bathhouse is stored in a water receiving tank, and the hot drainage is pumped up by a pump and supplied to a vibrating filter. After removing the impurities contained in it, the water is pumped to the primary flow path of the plate heat exchanger that can be decomposed by the water pump or the plate heat exchanger that is permanently joined, and the fluid and heat in the secondary flow path are removed. In the exhaust heat recovery device for baths to be exchanged, a switching valve is provided on each of the inlet and outlet sides of at least the primary flow path of the plate heat exchanger, and the pressure that issues a detection signal when the primary flow path pressure reaches a certain value. A switch or a timer that emits a signal at an appropriate time interval switches the switching valve to change the flow direction of the hot waste water in the heat exchanger.

Further, in the present invention, in addition to the above-mentioned structure, the discharge of the plate type heat exchanger to the atmosphere in the primary passage is performed at a higher place than the heat exchanger.

[0007]

[Function] Hair or thread waste caught at the inlet of the primary flow passage of the plate heat exchanger that can be disassembled or is permanently joined is switched over by switching the switching valve installed in the primary flow passage. It can be easily removed by washing. During backwashing, the primary and secondary flow paths are co-current, but since the backwashing time is relatively short, there is no particular problem in that the heat recovery efficiency is reduced. When installing the switching valve in each of the primary flow path and the secondary flow path of the plate heat exchanger,
Counterflow can be maintained even during backwashing.

By discharging the primary flow path of the plate heat exchanger to the atmosphere at a higher place than the heat exchanger, the siphon phenomenon is prevented, and the liquid is always introduced into the primary flow path of the plate heat exchanger. Keep it full. Therefore, even if there is fat or the like in the warm waste water, it does not solidify by contact with air and does not cause clogging.

[0009]

EXAMPLE In the example shown in FIG. 1, warm waste water discharged from a washing place or a bathtub of a bathhouse 1 is led through a drain pipe 2 into a water receiving tank 3 in which a pump 4 is installed, and the water is pumped. The well-known vibration type filter 5 for the warm waste water pumped up by the pump 4
To remove the contaminants such as hair, thread waste, dust, and fat contained in the hot waste water, and then decompose the water by the water pump 6 or a plate heat that is permanently joined. The pressure is sent to the primary flow path of the exchanger 7, and after heat exchange with the secondary flow path, the discharge to the atmosphere is performed at a higher place than the heat exchanger 7. In the illustrated example, the drain hopper 24
It is received by and discharged to the drainage discharge pipe 8. The secondary flow path of the plate heat exchanger 7 is a circulation pump 9
The water in the water supply tank 10 is preheated by circulating the water in the water supply tank 10 through the water, and the water thus preheated is supplied to the bathhouse 1 via the preheat water supply pipe 11, while a part of the heating device 12 is used. After reheating to a desired temperature by, the hot water is supplied to the bathhouse 1 through the hot water supply pipe 13. In the bathhouse 1, the preheated water supply and the hot water supply are mixed with hot water using the hot water tap 14 and the rising hot water tap 15 and used.

By the way, in the example of FIG. 1, a pressure switch 16 is provided on the discharge side of the water feed pump 6, and switching valves 17, 17, 1 are provided in the primary flow passage and the secondary flow passage of the plate heat exchanger 7, respectively.
8 and 18 are attached. When hair or lint remaining in the warm waste water that has passed through the filter 5 gets caught in the primary flow path inlet of the plate heat exchanger 7 and becomes clogged, the pressure in the primary flow path increases, and the pressure has a certain value. Then, the pressure switch 1
According to the detection signal from 6, the switching valves 17, 17, 1
Switching between No. 8 and No. 18 is performed, and the flow directions of the primary flow path and the secondary flow path are reversed.

Since the time required for backwashing is relatively short, there is no particular problem even if the primary flow passage and the secondary flow passage of the plate heat exchanger 7 are co-current during that time. Therefore, the switching valve 1 is provided only in the primary flow path of the plate heat exchanger 7.
7 and 17 may be provided to allow backwashing. Further, instead of the pressure switch 16, a timer (not shown) or the like is used to provide the switching valves 17, 17, 18, 1 at appropriate intervals.
8 may be switched. That is, the switching valves 17 and 17 are provided on the inlet and outlet sides of at least the primary flow path of the plate heat exchanger 7, and the pressure switch 16 that issues a detection signal when the primary flow path pressure reaches a certain value or an appropriate time The switching valves 17 and 17 are switched by a timer that emits a signal at intervals so that the flow direction of the waste water in the heat exchanger 7 can be changed.

In the example of FIG. 1, the float switch 19 is turned on / off depending on the liquid level in the water receiving tank 3, and controls not only the pump 4 but also the water pump 6 and the circulation pump 9,
When the hot drainage water in the water receiving tank 3 is above a predetermined water level, the plate heat exchanger 7 is always used regardless of whether water is supplied or hot water is supplied.
The waste heat is supplied to the primary flow path, the exhaust heat is recovered in the secondary flow path circulating with the water supply tank 10, and is stored in the water supply tank 10.

However, the water supply tank 10 described above can be omitted by the following procedure. That is, as in the example of FIG. 2, the flow switch 21 is attached to the water supply pipe 20, and the pumping pump 4 and the water supply pump 6 are activated only while water is being supplied to the secondary flow path of the plate heat exchanger 7. The water supply tank 10 is omitted by supplying warm waste water to the primary flow path to recover heat.

Further, in the example of FIG. 3, a water meter 22 with a transmitter is attached to the water supply pipe 20, and the pumping pump 4 and the water supply pump are provided only while water is being supplied to the secondary flow path of the plate heat exchanger 7. 6 is started, and the amount of water pumped by the water pump 4 and the amount of water pumped by the water pump 6 are controlled in accordance with the amount of water supplied to the secondary flow path of the plate heat exchanger 7 by the inverter 23. It is possible to omit the tank 10.

The switching valves 17 and 18 shown in the figure are three-way valves, and two switching valves are provided for each, but four switching valves may be provided, and in this case, one switching valve is sufficient.

[0016]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, even if a decomposable plate type heat exchanger or a permanently joined plate type heat exchanger is used as an exhaust heat recovery device for a bath, its primary flow Hair and lint that get caught at the entrance of the passage can be easily removed by backwashing, and the contact between the fat and hot air in the hot wastewater was blocked to prevent the fat from solidifying. It is possible for the first time to always maintain good heat recovery efficiency because it does not clog.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an exhaust heat recovery system for a bath according to the present invention.

FIG. 2 is a view showing another embodiment of the exhaust heat recovery system for a bath according to the present invention.

FIG. 3 is a view showing still another embodiment of the exhaust heat recovery system for bath according to the present invention.

[Explanation of symbols]

1 ... Bathhouse, 2 ... Drainage pipe, 3 ... Water receiving tank, 4 ... Pumping pump,
5 ... Vibration type filter, 6 ... Water pump, 7 ... Decomposable plate type heat exchanger or permanently joined plate type heat exchanger, 8 ... Drainage discharge pipe, 9 ... Circulation pump, 10 ... Water tank , 11 ... Preheating water supply pipe, 12 ... Heating device, 13 ...
Hot water supply pipe, 14 ... Hot water supply tap, 15 ... Upflow water tap, 16 ... Pressure switch, 17, 18 ... Changeover valve, 19 ... Float switch, 20 ... Water supply pipe, 21 ... Flow switch, 22 ... Water meter with transmitter, 23 … Inverter, 24… Drainage hopper.

Claims (2)

(57) [Claims] 1. Contaminants contained in the warm drainage are removed by storing the warm drainage discharged from the washing place of the bathhouse or the bathtub in the water receiving tank and pumping it up and supplying it to the vibration type filter. After that, the exhaust heat recovery device for the bath, which sends pressure to the primary flow path of the plate heat exchanger that can be decomposed by the water pump or the plate heat exchanger that is permanently joined and exchanges heat with the fluid in the secondary flow path In the plate heat exchanger, a switching valve is provided at least on the inlet / outlet side of the primary flow passage, and a pressure switch that outputs a detection signal when the primary flow passage pressure reaches a certain value or an appropriate time interval is set. An exhaust heat recovery device for a bath, wherein the switching valve can be switched by a timer that emits a signal to change the flow direction of the hot waste water in the heat exchanger. 2. Contaminants contained in the warm wastewater are removed by storing the warm wastewater discharged from the washing place of the bathhouse or the bathtub in the water receiving tank, pumping it up and supplying it to the vibrating filter. After that, the exhaust heat recovery device for the bath, which sends pressure to the primary flow path of the plate heat exchanger that can be decomposed by the water pump or the plate heat exchanger that is permanently joined and exchanges heat with the fluid in the secondary flow path In the plate heat exchanger, a switching valve is provided at least on the inlet / outlet side of the primary flow passage, and a pressure switch that outputs a detection signal when the primary flow passage pressure reaches a certain value or an appropriate time interval is set. It is possible to change the flow direction of the hot waste water in the heat exchanger by switching the switching valve by a timer that emits a signal, and the discharge to the atmosphere in the primary flow path of the plate heat exchanger is more than that of the heat exchanger. Perform in high places An exhaust heat recovery device for baths, which is characterized in that