JPH0587400A - Hot water circulating device for bath with boiler - Google Patents

Abstract

PURPOSE:To prevent injection of hot water by using a boiler having a large thermal capacity and increasing an ignition time of a burner. CONSTITUTION:A heat exchanging pipe 9 is arranged in a warm water chamber 8 of a boiler 3. A bypass passage 11 is connected in parallel with the pipe 9. A switching valve 12 is connected to the pipe 9 and the passage 11. The valve 12 is controlled by a temperature sensor 10 of bathtub water. The pipe 9 and the passage 11 are connected in parallel for a predetermined time immediately after the want water of the pipe 9 is circulated to a bathtub. The passage 11 is connected to the pipe 9 to circulate the water in the bathtub to both thereby to lower the temperature of the hot water stored in the pipe 9 and to inject it to the bathtub.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water circulating device for a bath, in which bath water in a bath is circulated, heated by a boiler to warm it to a comfortable temperature, and further, hot water is clarified by a filtering member. Regarding

[0002]

2. Description of the Related Art A hot water circulating device for a bath has been developed in which hot water in a bath is continuously circulated through a filtering member for 24 hours to be kept clear and which allows the user to take a bath at any time. This device measures the temperature of hot water and warms it to a constant temperature, and removes dirt, bacteria, etc. contained in the hot water and keeps it clear.

A circulating hot water device for a bath, which can be used every day without being replaced with fresh water, can simultaneously satisfy both characteristics of water saving and energy saving. In addition, you can take a bath 24 hours a day at any time and you can use it very conveniently.

In this type of bath, a heater is used to maintain a set temperature, and a filter member is used to continuously filter hot water for 24 hours to keep it clean. In order to realize this, the hot water circulation device is provided with a circulation pump, a heater, and a filtering member in the hot water circulation path. The heater is controlled by a temperature sensor to heat hot water to a constant temperature. The heater has a drawback that the amount of heat generated is as small as 1000 Kcal or less per hour, and it takes time to heat the bath water to an appropriate temperature when it is replaced. Further, if the bath water is kept at the set temperature for 24 hours by the heater, there is a drawback that the running cost becomes high. ..

A device using a boiler that burns kerosene or heavy oil instead of an electric heater can reduce running costs. This is because kerosene and heavy oil are cheaper than electric heating. In addition, the amount of heat generated by the boiler is extremely large, and it has the feature that the heating time of hot water can be significantly shortened.

[0006]

However, when the bath water is heated by the boiler, the boiler is ignited,
There is a drawback that hot water is sprayed from the circulation pipe into the bathtub, making it difficult to bathe comfortably. This is due to the large amount of heat generated by the boiler. In order to solve this drawback, the present inventor has developed a hot water circulation device for a bath shown in FIG. 6 (Japanese Patent Laid-Open No. 3-32914). In this device, temperature sensors 6 and 5 are provided on the suction side and the discharge side of the circulation pipe 4. The temperature sensor 6 on the suction side operates the boiler 3 when the temperature of the bath water is equal to or lower than the set temperature. The temperature sensor 5 on the discharge side stops the operation of the boiler 3 when the temperature of the hot water to be jetted reaches a certain temperature or higher so that hot water is not jetted to the bathtub.

Since this apparatus controls the operation of the boiler 3 at the injection temperature, it is possible to prevent hot water from being injected. However, this structure has a drawback that the boiler frequently repeats ignition and extinction. It is because when the boiler has been ignited for a certain period of time and the temperature on the suction side is below the set temperature, the injection temperature rises, the boiler is extinguished, and this process is repeated many times. Is kept constant.

This drawback can be solved by reducing the amount of heat generated by the boiler. However, it is extremely difficult for a boiler equipped with a gun-type burner used for this type of application to have a heating value of 15,000 Kcal or less. This type of burner requires the use of extremely thin nozzles in order to reduce the amount of heat generated. No matter how thin the nozzle is, as long as the fuel is injected from here, the flow rate is 1 hour per hour.
It is extremely difficult to make it less than liter (17 cc when converted into 1 minute). Therefore, the amount of heat generated is so large that it cannot be compared with the electric heater.

The present inventor has developed a boiler having a unique structure in order to lengthen the ignition time of the burner despite the large amount of heat generated. This boiler does not heat the bath water directly with the burner. Bath water is indirectly heated through a heat exchange pipe in a hot water chamber provided in the boiler. For this reason, the boiler has a structure in which a hot water chamber is heated by a burner and a heat exchange pipe is connected to the hot water chamber.

In the boiler having this structure, the ignition time of the burner can be lengthened by increasing the capacity of the hot water chamber. This is because the burner extinguishes the fire after heating a large amount of hot water stored in the hot water chamber. Therefore, the boiler having this structure has the advantages that the disadvantage that the burner is frequently ignited and extinguished can be solved, the thermal efficiency can be increased, and the life of the boiler can be extended and maintenance can be simplified.

However, the boiler having this structure has a drawback that the temperature of bath water cannot be controlled by turning the burner on and off. This is because if hot water is constantly circulated in the heat exchange pipe of the hot water chamber, the bath water is heated by the heat exchange pipe even after the burner is extinguished. For this reason, the boiler of this structure needs to connect the bypass passage in parallel with the heat exchange pipe. The bath water can be circulated by switching between the bypass passage and the heat exchange pipe to maintain a constant temperature. Bath water circulated in the bypass is not heated. Bath water circulated in the heat exchange pipe is heated. Therefore, when the temperature of the bathtub water becomes equal to or lower than the set temperature, the bath water circulates in the heat exchange pipe, and when the temperature becomes equal to or higher than the set temperature, the bath water circulates in the bypass passage so that the temperature can be kept constant.

The device of this structure has a feature that the operation time of a boiler that generates a large amount of heat can be extended. However, the device of this structure has a drawback that hot water is temporarily injected from the heat exchange pipe when the bypass passage is switched to the heat exchange pipe.

The present invention was developed with the object of solving this drawback, and the important object of the present invention is to:
(EN) A hot water circulation device for a bath having a boiler in which a burner that generates a large amount of heat can be used to prolong the operating time of the burner and hot water is not injected from a circulation pipe on the discharge side.

[0014]

A hot water circulating apparatus for a bath having a boiler of the present invention has the following constitution in order to achieve the above object. (A) The hot water circulation device for a bath has a hot water circulation path connected to the bathtub via the circulation pipe 4. (B) The boiler 3 includes a hot water chamber 8 heated by the burner 7 and a heat exchange pipe 9 provided in the hot water chamber 8. (C) The circulation pump 1 and the filtration member 2 are provided in the hot water circulation path.
And the heat exchange pipe 9 are connected in series. (D) The hot water circulation path is provided with a temperature sensor 10 for detecting the temperature of circulating bath water. (E) The heat exchange pipe 9 is connected in parallel with the bypass passage 11. (F) The heat exchange pipe 9 and the bypass passage 11 have a switching valve 1
Two are connected. (G) The control means 13 for controlling the switching valve 12 by the input signal of the temperature sensor 10 is provided. (H) The control means 13 opens the switching valve 12 on the bypass passage 11 side when the temperature of the bath water is equal to or higher than the set temperature, closes the switching valve 12 on the heat exchange pipe 9 side, and bypasses the temperature below the set temperature. The switching valve 12 on the side of the passage 11 is closed, and the heat exchange pipe 9
Side switching valve 12 is opened, and the heat exchange pipe 9 side switching valve 1
Immediately before the valve 2 is opened, the switching valve 1 on the bypass 11 side
2 is also controlled to open, and the bath water is heated to the heat exchange pipe 9
And the bypass 11 are both circulated.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below are examples of a hot water circulation device for a bath for embodying the technical idea of the present invention, and the device of the present invention is composed of materials, shapes, and
The structure and arrangement are not specified in the structure below. The device of the present invention can be modified in various ways within the scope of the claims.

Further, in this specification, for easier understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims" and "means for solving the problems". It is added to the members shown in "Column". However, the members shown in the claims are not limited to the members of the embodiment.

A hot water circulation device for a bath having a boiler shown in FIG. 1 has a boiler 3 and a circulation pipe 4
It has a hot water circulation path connected to the bathtub via. A circulation pump 1, a filtration member 2, and a boiler 3 are provided in the hot water circulation path.
And the heat exchange pipe 9 are connected in series.

The boiler 3 has a gun-type burner 7 for burning kerosene, a watertight hot water chamber 8 heated by the burner 7, and hot water stored in the hot water chamber 8 connected to the hot water chamber 8. It is provided with a heat exchange pipe 9 that is heated through. The hot water chamber temperature sensor 14 is provided in the hot water chamber 8, and the operation of the burner 7 is controlled by the hot water chamber temperature sensor 14 to control the water temperature of the hot water chamber 8 within a certain range. When the water temperature in the hot water chamber 8 falls below the set value, the burner 7 is ignited to raise the water temperature in the hot water chamber 8. When the water temperature in the warm water chamber 8 is heated to the set temperature or higher, the operation of the burner 7 is stopped. The water temperature of the warm water chamber 8 is preferably set in the range of 70 to 90 ° C.

The hot water chamber 8 of the boiler 3 is connected to a water pipe via a supply valve. Furthermore, the warm water chamber 8 has a water supply valve 15
Is connected to the bathtub via. As described above, in the device in which the hot water chamber 8 is connected to the bathtub, the hot water in the hot water chamber 8 can be directly supplied to the bathtub by opening the water supply valve 15. This device has the feature that it can quickly supply new hot water to the bathtub. The hot water circulation device of the present invention can be continuously used for several months without changing bath water every day,
The bath water may be replaced if the filter is washed or if a large amount of foreign matter is added to the bath water. In this case, hot water can be supplied from the hot water chamber 8 to quickly supply hot water to the bathtub. The hot water in the hot water chamber 8 can also be used for hot water supply in a kitchen or the like.

Since the filtering member 2 and the circulation pump 1 are connected in series to the heat exchange pipe 9 and connected to the bath, the bath water can be circulated there to heat the pipe. When the bath water becomes higher than the set temperature and the bath water is circulated through the heat exchange pipe 9, the bath water is heated to a higher temperature. A normal bath water heating device can stop the circulation of bath water when the temperature of the bath water reaches a set temperature. However, the device of the present invention cannot stop the circulation of bath water in any case. This is because the bath water is continuously filtered by the filtration member 2 for 24 hours to keep the bath water clear without exchanging it.

In order to prevent the bath water from circulating in the heat exchange pipe 9 without stopping the circulation of the bath water, a bypass passage 11 is connected to the heat exchange pipe 9 via a switching valve 12. The switching valve 12 selectively switches the bath water to the heat exchange pipe 9 and the bypass passage 11 to circulate it. When the temperature of the bath water falls below the set temperature, the switching valve 12 circulates the bath water in the heat exchange pipe 9 to heat it. When the water temperature of the bath water reaches or exceeds the set temperature, the switching valve 12 circulates the bath water in the bypass passage 11 and stops the heating by the heat exchange pipe 9.

In the apparatus shown in FIG. 1, a switching valve 12 is connected in series to the bypass passage 11 and the heat exchange pipe 9. The two switching valves 12 circulate bath water on the opened side. When the switching valve 12 connected to the bypass passage 11 is opened and the switching valve 12 connected to the heat exchange pipe 9 is closed, the bath water is circulated in the bypass passage 11. On the contrary, when the switching valve 12 connected to the bypass passage 11 is closed and the switching valve 12 of the heat exchange pipe 9 is opened, the bath water is circulated in the heat exchange pipe 9.

As the switching valve 12, an electromagnetic valve opened and closed by the control means 13 is used. The control means 13 detects the temperature of the bath water with the temperature sensor 10 and controls the opening and closing of the two switching valves 12. The temperature sensor 10 is provided inside the circulation pipe 4 on the suction side of the heat exchange pipe 9 and the bypass passage 11, and detects the temperature of the bath water.

The control means 13 detects the temperature of the bath water with the temperature sensor 10 and controls the switching valve 12 in the following state.

When the water temperature of the bath water is equal to or higher than the set temperature, the switching valve 12 of the heat exchange pipe 9 is closed. The switching valve 12 on the side of the bypass 11 is opened. In this state, the bath water flows into the bypass 11. Circulated. The bypass passage 11 circulates the bath water without heating it. At this time, since the hot water in the heat exchange pipe 9 provided in the hot water chamber 8 is not circulated, it is heated to a considerably high temperature by the hot water in the hot water chamber 8 and becomes hot water.

At the moment when the water temperature of the bath water drops below the set temperature, the switching valve 12 of the heat exchange pipe 9 is opened. The switching valve 12 on the side of the bypass 11 is opened. In this state, the heat exchange pipe 9 is opened. The hot water that had accumulated is supplied to the bathtub. However, in this state, not only the hot water in the heat exchange pipe 9 but also the bypass 1
Since hot water is also supplied from 1, the hot water stored in the heat exchange pipe 9 is mixed with the hot water in the bypass passage 11 to lower the temperature and is circulated in the bath. This state is continued until the hot water is completely discharged from the heat exchange pipe 9.

After the hot water is discharged from the heat exchange pipe 9, when the water temperature of the bath water is lower than the set temperature, the switching valve 12 of the heat exchange pipe 9 opens ... The switching valve 12 of the bypass 11 side closes. Valve In this state, the bath water is circulated through the heat exchange pipe 9 and is heated by the hot water in the hot water chamber 8 via the heat exchange pipe 9. After that, when the bath water is heated above the set temperature,
Then, the switching valve 12 of the heat exchange pipe 9 ... Closed, the switching valve 12 of the bypass passage 11 side ... Opened, and the following states are repeated to keep the bath water at a constant temperature.

The hot water circulating apparatus for bath shown in FIG. 2 uses a three-way valve as the switching valve 12. The operating state of the three-way valve is shown in FIGS. The switching valve 12 includes a rotor 16 inside a casing, which is rotated by a reduction motor (not shown). The rotor 16 penetrates the hot water passage in the diameter direction. The outer circumference of the rotor 16 slides on the inner circumference of the casing 17 in a watertight state. Casing 17
Ports 18 and 19 for connecting the bypass passage 11 and the heat exchange pipe 9 are opened at a position of 90 degrees with respect to the center. On the opposite side of both ports 18 and 19, a port 20 for connecting to the circulation pump 1 is opened in the center thereof.

As shown in FIG. 3, when the rotor 16 is rotated to a position where the hot water passage is horizontal, the port 18 of the heat exchange pipe 9 is connected to the port 20 of the circulation pump 1.
When the rotor 16 is rotated 45 degrees from this position, as shown in FIG.
The port 20 of the circulation pump 1 is connected to the ports 18 and 19 of both the heat exchange pipe 9 and the bypass passage 11, as shown in FIG. When the rotor 16 is further rotated 45 degrees,
As shown in FIG. 5, the port 19 of the bypass 11 is connected to the port 20 of the circulation pump 1. In the switching valve 12 having this structure, only the heat exchange pipe 9 (FIG. 3) and the bypass passage 11 (FIG. 4) are connected to the suction side of the circulation pump 1 by rotating the rotor 16 with a reduction motor. 11 (FIG. 5) can be connected.

The rotation of the reduction motor for rotating the rotor 16 of the switching valve 12 is controlled by the control means 13. Similar to the switching valve 12 in FIG. 1, the control means 13 connects the circulation pump 1 to the bypass passage 11 only when the water temperature of the bath water is equal to or higher than the set temperature, and immediately after the water temperature of the bath water drops to the set temperature or less. Connects the suction side of the circulation pump 1 to both the bypass passage 11 and the heat exchange pipe 9 until the hot water of the heat exchange pipe 9 is discharged, and after the hot water of the heat exchange pipe 9 is discharged, When only the heat exchange pipe 9 is connected and the water temperature of the bath water rises above the set temperature, the heat exchange pipe 9 is switched to the bypass path 11, and this operation is repeated to keep the temperature of the bath water at the set temperature.

The circulation pump 1 sucks the hot water in the bath and forcibly circulates it in the hot water circulation path. Therefore, the suction side of the circulation pump 1 is connected to the suction port of the bath via the switching valve 12 and the heat exchange pipe 9, and the discharge side is connected to the bath via the filtering member 2. The circulation pump 1 is continuously operated for 24 hours.

The filter member 2 filters the hot water in the bath tub in a clear manner. The filtering member 2 contains a filter material for clarifying warm water. As the slag material, a material obtained by crushing porous natural stone into particles or a material obtained by crushing natural stone and sintering it into a porous material can be used. This lumber becomes a comfortable environment for the reproduction of microorganisms, and aerobic microorganisms parasitize it. Microorganisms decompose by eating ammonia and proteins contained in warm water as food. Therefore, sweat and dirt in the warm water are effectively removed by the microorganisms, and the warm water is kept clear. When foreign matter is deposited on the filtration member 2 and the circulation amount of hot water is reduced, the fining action is reduced.

In the apparatus shown in FIGS. 1 and 2, a primary filter 21 is connected to the suction port of the circulation pipe 4. The primary filter 21 filters the hot water sucked into the hot water circulation path to remove foreign matters such as hair and organic soft material. The primary filter 21 is a filter material that physically filters hot water, for example,
It incorporates open-cell synthetic resin foam, non-woven fabric, filter paper, wire mesh and other materials.

[0034]

INDUSTRIAL APPLICABILITY The hot water circulation device for a bath according to the present invention has the advantages that the operating time of the burner can be lengthened even though a large capacity boiler is used, and that hot water is not injected into the bathtub. is there. It heats the bath water to be circulated to the heat exchange pipe through the hot water in the hot water chamber without the burner directly heating the bath water, and further, the circulation route of the bath water from the bypass passage to the heat exchange pipe. The reason is that the bath water is temporarily circulated in both the bypass and the heat exchange pipe when switching.

In the apparatus having this structure, the burner heats the hot water stored in the hot water chamber. The hot water in the hot water chamber can have a wide range between the minimum temperature and the maximum temperature. This is because the temperature of the bath water can be controlled to a constant temperature even if the set temperature of the hot water chamber is drastically changed. The amount of warm water stored in the warm water chamber can be increased by increasing the volume of the warm water chamber. Therefore, the burner can heat a large amount of hot water in a large temperature range, and the ignition time can be lengthened.

Further, when the temperature of the bath water drops, the circulation path is switched from the bypass path to the heat exchange pipe.
At this time, the bath water stored in the heat exchange pipe is sprayed into the bathroom. The bath water in the heat exchange pipe is not circulated while the bath water is circulated in the bypass passage. Therefore, in this state, the hot water in the heat exchange pipe is heated to a temperature almost the same as the hot water temperature in the hot water chamber. Therefore,
When the bath water of the heat exchange pipe is directly jetted into the bath, hot water is jetted. In order to solve this drawback, the device of the present invention connects both the heat exchange pipe and the bypass passage in parallel when the bath water in which the heat exchange pipe is stored is supplied to the bathtub and is circulated in the bypass passage. The bath water is mixed with the bath water circulated in the heat exchange pipe and circulated. Therefore, the temperature of the bath water in the heat exchange pipe is lowered by the bath water in the bypass passage, and the bath water can be supplied to the bath without being in a hot water state.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a hot water circulation device for a bath having a boiler showing an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a hot water circulation device for a bath having a boiler showing an embodiment of the present invention.

FIG. 3 is a sectional view showing an example of a switching valve in which a circulation pump is connected to a heat exchange pipe.

FIG. 4 is a sectional view showing an example of a switching valve in which a circulation pump is connected to a heat exchange pipe.

FIG. 5 is a sectional view showing an example of a switching valve in which a circulation pump is connected to a heat exchange pipe.

FIG. 6 is a schematic block diagram of a hot water circulation device for a bath having a conventional boiler.

[Explanation of symbols]

1 ... Circulation pump 2 ... Filtration member 3 ...
Boiler 4 ... Circulation pipe 5 ... Temperature sensor 6 ...
Temperature sensor 7 ... Burner 8 ... Hot water chamber 9 ... Heat exchange pipe 10 ... Temperature sensor 11 ... Bypass 12
... Switching valve 13 ... Control means 14 ... Hot water chamber temperature sensor 15
… Supply valve 16… Rotor 17… Casing 18
… Port 19… Port 20… Port 21
… Primary filter

Claims (1)

[Claims] 1. A hot water circulation device for a bath, which has a boiler having all the configurations of (a) to (h) below. (A) A hot water circulation device for a bath includes a boiler (3) and a hot water circulation passage connected to a bath via a circulation pipe (4). (B) The boiler (3) includes a hot water chamber (8) heated by the burner (7) and a heat exchange pipe (9) connected to the hot water chamber (8).
It has and. (C) The circulation pump (1) and the filtering member are provided in the hot water circulation path.
(2) and the heat exchange pipe (9) are connected in series. (D) The hot water circulation path is provided with a temperature sensor (10) for detecting the temperature of circulating bath water. (E) A bypass path (11) is connected in parallel to the heat exchange pipe (9) via a switching valve (12). (F) A switching valve for the heat exchange pipe (9) and the bypass passage (11)
(12) is linked. (G) A control means (13) for controlling the switching valve (12) by an input signal of the temperature sensor (10) is provided. (H) The control means (13) opens the switching valve (12) on the bypass passage (11) side when the temperature of the bath water is equal to or higher than the set temperature, and the switching valve (12) on the heat exchange pipe (9) side And the switching valve (12) on the bypass path (11) side at the set temperature or lower,
Immediately before the switching valve (12) on the (9) side is opened and the switching valve (12) on the heat exchange pipe (9) side is opened, the switching valve (12) on the bypass passage (11) side is also opened. The bath water is controlled to open so that the bath water circulates through both the heat exchange pipe (9) and the bypass passage (11).