JP2003106645A - Bath heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bath heating device that prevents high temperature water in a bath heat exchanger warmed by hot water in a hot water storage tank from flowing out of a circulating adapter as holding the high temperature intact in an initial stage of heating water in a bathtub (when a three-way valve connects to the bath heat exchanger). SOLUTION: The bath heating device comprises: a heating vessel with the hot water storage tank; a circulating pump for circulating water in the bathtub; the bath heat exchanger for subjecting water from the circulating pump to heat exchange with hot water in the hot water storage tank to heat it indirectly; a first bypass pipe with one end connected between the bath heat exchanger and the circulating pump in one line with the circulating pump interposed and the other end connected to the other line without the circulating pump, which lines connect the bathtub and the bath heat exchanger; the three-way valve disposed at either of connections of the first bypass pipe and both lines to change the passage of water in the bathtub to the bath heat exchanger or the first bypass pipe; and a flow detecting means disposed between the bathtub and the three-way valve to determine whether circulation is going on or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating can body having a hot water storage tank, a circulation pump for sucking and circulating hot water in a bath, hot water from the circulation pump and hot water in the bath heat exchanger. The present invention relates to a bath heating device including a bath heat exchanger that heats indirectly by heating.

[0002]

2. Description of the Related Art A conventional bath heating device includes a heating can body having a hot water storage tank, a circulation pump for sucking and circulating hot water in the bath, and hot water from the circulation pump and hot water in the hot water storage tank. Connect the bath heat exchanger for indirect heating by exchanging, the bathtub and the bath heat exchanger, and connect one end between the bath heat exchanger and the circulation pump of one pipeline having a circulation pump in the middle. , A bypass pipe having the other end connected to the other pipe having no circulation pump, and the hot and cold water in the bathtub provided in either of the connecting portions of the bypass pipe and the both pipes, the bath heat exchanger Side of the bypass pipe and a three-way valve for switching the flow path, and a flow rate detection means for determining the presence or absence of circulation provided between the bath and the three-way valve, the temperature of hot water in the bath Check by switching the three-way valve to the bypass pipe side When the temperature of the hot water is higher than the set bath temperature, leave the three-way valve as it is without switching to the bath heat exchanger side, and switch the three-way valve to the bath heat exchanger side only when the temperature of the hot water in the bathtub is lower than the set bath temperature. Therefore, the temperature of the hot water in the bathtub was prevented from rising.

[0003]

However, in the conventional bath heating device, when boiling water in the bathtub (the three-way valve is on the bath heat exchanger side), the bath heat warmed by the hot water in the hot water storage tank is initially set. The hot water in the exchanger sometimes flowed out from the circulation adapter at high temperature and felt uncomfortable.

Therefore, an object of the present invention is to boil the hot and cold water in the bathtub (the three-way valve is on the bath heat exchanger side) at the initial stage of
It is an object of the present invention to provide a bath heating device that prevents hot hot water in a bath heat exchanger warmed by hot water in a hot water storage tank from flowing out of a circulation adapter at a high temperature.

[0005]

In order to achieve the above object, a heating can body having a hot water storage tank, a circulation pump for sucking and circulating hot water in the bathtub, and A bath heat exchanger that indirectly heats hot water from the circulation pump by exchanging heat with the hot water in the hot water storage tank, connects the bathtub and the bath heat exchanger, and connects one of the pipelines with a circulation pump in the middle. A first bypass pipe having one end connected between the bath heat exchanger and the circulation pump and the other end connected to the other pipe line having no circulation pump; and the first bypass pipe and the two pipe lines. Between the bathtub and the three-way valve, a three-way valve for switching hot water in the bathtub provided in either one of the connection parts to the bath heat exchanger side or the first bypass pipe side And a flow rate detection means for determining the presence or absence of circulation provided in the A second bypass pipe, one end of which is connected between a ring pump and the three-way valve, the other end of which is connected to the other pipe line that does not have a circulation pump, and which is short-cut without passing through the three-way valve depending on the opening degree of the three-way valve. Since the opening and / or rotation speed of the three-way valve is controlled, hot water in the bathtub and hot water in the bath heat exchanger warmed to the temperature of the hot water in the hot water tank are mixed, When boiling water in the bathtub (the three-way valve is on the bath heat exchanger side), the hot water in the bath heat exchanger warmed by the hot water in the hot water tank should flow out from the circulation adapter at a high temperature in the initial stage. Can be prevented.

In the present invention, since the inner diameter of the second bypass pipe is smaller than the inner diameters of the both pipe lines, the boiling water in the bathtub is boiled (three directions) without lowering the boiling efficiency of the bath. When the valve is on the bath heat exchanger side), it is possible to prevent hot water in the bath heat exchanger warmed by hot water in the hot water tank from flowing out from the circulation adapter at a high temperature in the initial stage.

In claim 3, claim 1 or 2
In the bath heating device according to the item, the opening degree of the three-way valve is adjusted based on the elapsed time since the last circulation pump operation was stopped. At the time of heat exchanger side), it is possible to prevent hot water in the bath heat exchanger warmed by hot water in the hot water tank from flowing out from the circulation adapter at a high temperature in the initial stage.

In claim 4, claim 1 or 2
In the bath heating device according to the paragraph (3), since the opening degree of the three-way valve is adjusted based on the hot water temperature in the hot water storage tank, when boiling water in the bathtub (three-way valve on the bath heat exchanger side) At the initial stage, it is possible to prevent hot water in the bath heat exchanger warmed by hot water in the hot water storage tank from flowing out from the circulation adapter at a high temperature.

According to a fifth aspect of the present invention, in the bath heating apparatus according to the first or second aspect, the rotational speed of the three-way valve is adjusted based on the temperature of hot water in the hot water storage tank. When the hot water in the bath is heated (the three-way valve is on the bath heat exchanger side), the hot water in the bath heat exchanger warmed by the hot water in the hot water tank should flow out from the circulation adapter at a high temperature in the early stage. Can be prevented.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram of a bath heating apparatus according to an embodiment of the present invention.

As shown in the figure, the bath heating device includes a heating can body 1, a water supply pipe 10 for supplying water from a water supply source (not shown) to a hot water tank 2 provided in the heating can body 1, and The hot water in the hot water storage tank 2 heated by the burner 13 is composed of a hot water supply pipe 19 and a hot water supply pipe 11 for supplying the hot water to a hot water tap (not shown).

The hot water storage tank 2 is provided with a hot water storage temperature sensor 9 for detecting the temperature of hot water in the hot water storage tank 2. Further, a bypass pipe 17 branched from the water supply pipe 10 and connected to the hot water discharge pipe 19 without the hot water storage tank 2, and the bypass pipe 17 and the hot water discharge pipe 1
At the confluence of 9, the hot water in the hot water tank 2 and the bypass pipe 17
A mixing valve 18 for controlling mixing of water sent from the stepping motor M is provided.

Further, in the water supply pipe 10, a water temperature sensor 14 for detecting the temperature Tc of the water from the water supply source, and an amount Q of water.
The hot water tank outlet temperature sensor 15 for detecting the outlet temperature Th of the hot water storage tank 2 and the hot water supply pipe 11 downstream of the mixing valve 18 are connected to the hot water outlet pipe 19 upstream of the water mixing sensor 18 and the mixing valve 18. Is provided with a mixed hot water temperature detection sensor 16 for detecting the mixed hot water temperature Tm after mixing. The mixing valve 18 also has a water amount adjusting function for reducing the water amount when the required heat amount exceeds the maximum capacity of the device.

The burner 13 includes a fan 3 for supplying air necessary for heating, a nozzle 5 for supplying kerosene to form a flame, a spark plug 6 required for ignition,
It is composed of CdS7 or the like that detects the presence or absence of a flame.

Further, a kerosene supply pipe 12 for supplying kerosene to the nozzle 5 provided in the burner 13 is provided, and the kerosene supply pipe 12 is provided with an electromagnetic pump 4 for pumping kerosene to the nozzle 5. ing.

A bath heat exchanger 20 is provided in the hot water storage tank 2 and is connected to a circulation adapter 25 provided in a bath 26 via a circulation pipe 24.

Further, in the circulation pipe 24, a circulation pump 21 for stirring the hot water in the bath 26, a bath temperature sensor 22 for detecting the temperature of the hot water, and a flow rate detector 23 for detecting the presence or absence of the hot water. , A three-way valve 27 that switches between circulating the hot water in the bathtub 26 to the first bypass pipe 28 side or the bath heat exchanger 20 side, and the hot water in the bathtub 26 by the opening degree of the three-way valve 27 A second bypass pipe 29 is provided which does not pass and which is a shortcut.

The bath heating device further includes the sensors 1 described above.
Detection signals (Tc, 4, 8, 15, 16, 9, 22)
Q, Th, Tm, Tk, Thr) and set temperature signals (Ts, Tsh) from the hot water supply temperature setting switch and the bath temperature setting switch provided on the remote controller (not shown).
Based on the electromagnetic pump 4, circulation pump 21, three-way valve 2
7, a control unit (not shown) for controlling the burner 13, the mixing valve 18, and the like are also provided.

The hot water supply operation and the bath heating operation will be described based on the above configuration. Now, in the state where the operation switch of the water heater is turned on by the remote controller (not shown), even when hot water is not actually used by the faucet,
In order to keep the temperature of the hot water in the hot water storage tank 2 at a predetermined high temperature (for example, 90 ° C.), the burner 13 is repeatedly turned on and off with the maximum heating capacity.

When the use of hot water is actually started, the water from the water supply source comes out of the hot water storage tank 2 through the path of the water supply pipe 10, the water amount sensor 8, the hot water storage tank 2, and the hot water discharge pipe 19.

The control unit (not shown) controls the inlet water temperature Tc detected by the inlet water temperature sensor 14 of the water supply pipe 10, the inlet water flow rate Q detected by the water amount sensor 8, and the outlet hot water temperature detected by the hot water tank outlet temperature sensor 15 of the outlet pipe 19. From Th and the set hot water supply temperature Ts set by the remote controller by the user, the mixing ratio of the water flowing through the bypass pipe 17 and the hot water flowing through the hot water supply pipe 19 so that the hot water after hot water mixing becomes the set hot water supply temperature Ts. Is calculated and a control signal is output to the mixing valve 18 so that the calculated mixing ratio is obtained.

As a result, the hot water from the hot water outlet pipe 19 and the water from the bypass pipe 17 are mixed at an appropriate mixing ratio, and become hot water having the set hot water supply temperature Ts set by the remote controller,
It flows into the hot water supply pipe 11. During this time, the burner 13 keeps the hot water tank 2
A heating operation for maintaining the hot water therein at a predetermined high temperature (for example, 90 ° C.) is performed.

Although the mixing valve 18 is provided at the connecting portion between the tap pipe 19 and the bypass pipe 17 here, the bypass pipe 17 may be provided with a flow rate adjusting valve for adjusting the amount of water. Good. In addition, the reheating operation of the bath is a three-way valve 27.
When the circulation pump 21 is operated by setting the temperature to the first bypass pipe 28 side and the hot water in the bathtub 26 is sucked by itself and the temperature detected by the bath temperature sensor 22 is higher than the set bath temperature Tsh set by the remote controller, the circulation is performed. Stop the pump. If it is low, the three-way valve 27 is fully opened to the bath heat exchanger 20 side while performing the three-way valve high temperature hot water prevention control, and is indirectly heated by the hot water in the hot water storage tank 2 via the bath heat exchanger 20 side.
Set bath temperature Ts set by a remote controller not shown
The hot water in the bathtub 26 is heated to h. here,
The three-way valve high-temperature hot water discharge prevention control is to adjust the opening degree and the rotation speed of the three-way valve 27 based on the hot water temperature in the hot water storage tank 2.

Next, the operation of this embodiment will be described with reference to FIG. First, in step S1, the previous reheating circulation pump 2
It is judged whether or not a predetermined time (for example, 25 minutes) has passed since the operation of No. 1 was stopped, and if it exceeds the predetermined time, in step 3, the hot water discharge prevention control of the three-way valve 27 (three-way valve 27
(Opening degree / rotational speed control).

When it is determined in step S1 that the time is not longer than the predetermined time, it is determined in step S2 whether the temperature of the hot water in the hot water storage tank 2 is higher than the set bath temperature Tsh + the predetermined temperature (for example, 20 ° C.). If the temperature is high, the hot water discharge prevention control of the three-way valve 27 is performed in step S3. If the temperature is not high, there is no concern that hot water will come out from the circulating bath adder 25, so the three-way valve 27 is switched to the bath heat exchanger 20 side in step S4.

Therefore, when the hot and cold water in the bathtub 26 is boiled (the three-way valve 27 is on the bath heat exchanger 20 side), the hot water in the bath heat exchanger 20 warmed by the hot water in the hot water storage tank 2 is initially set. Can be prevented from flowing out of the circulation adapter 25 at a high temperature. Here, for example, if the inner diameter of the second bypass pipe 29 is smaller than the inner diameter of the circulation pipe 24, the three-way valve 2
When 7 is completely switched to the bath heat exchanger 20, the hot and cold water in the bathtub 26 hardly flows (no leakage) into the second bypass pipe 29, and the boiling efficiency of the bath does not decrease. Naturally, when the hot water in the bathtub 26 is boiled (the three-way valve 27 is on the bath heat exchanger 20 side), the hot water in the bath heat exchanger 20 warmed by the hot water in the hot water storage tank 2 is a circulation adapter in the initial stage. It is also possible to prevent the gas from flowing out from 25 at a high temperature.

Next, the three-way valve high temperature hot water prevention control (three-way valve 2
The opening degree / rotational speed control of No. 7) will be described in detail.

First, a specific method of controlling the opening of the three-way valve 27 will be described as an example. The opening degree of the three-way valve 27 (opening area of the three-way valve) is opened until it becomes equal to the inner diameter area of the second bypass pipe 29, and the motor of the three-way valve 27 is stopped (for example, 10 seconds: this time is the hot water tank (Depending on the temperature of hot water in 2) Meanwhile, hot and cold water in the bathtub 26 flows to the second bypass pipe 29 and the bath heat exchanger 20 side, respectively, and high temperature hot water in the bath heat exchanger 20 disappears during that time, so the opening degree of the three-way valve 27 is changed to bath heat exchange. Even if it is fully opened on the side of the vessel 20, the boiling water in the bathtub 26 is boiled (the three-way valve 27 causes the bath heat exchanger 2 to
(0 side), the hot water in the bath heat exchanger 20 warmed by the hot water in the hot water storage tank 2 is initially circulated in the circulation adapter 25.
Can be prevented from flowing out at high temperature.

Second, a specific method of controlling the rotation speed of the three-way valve 27 will be described as an example. The flow rate detector 23 for detecting the presence or absence of hot water rotates the motor of the three-way valve 27 at a low speed until it determines that there is hot water, and after the flow rate detector 23 determines that there is hot water, the motor of the three-way valve 27. Is stopped (for example, 10 seconds: this time is determined by the temperature of the hot water in the hot water storage tank 2). Meanwhile, the hot water in the bathtub 26 flows to the second bypass pipe 29 and the bath heat exchanger 20 side, respectively, and the hot water in the bath heat exchanger 20 disappears.
By rotating the motor of No. 7 to the bath heat exchanger 20 side at high speed, the hot and cold water in the bathtub 26 is boiled in a short time (three-way valve 27
Is the bath heat exchanger 20 side), it is possible to prevent the hot water in the bath heat exchanger 20 warmed by the hot water in the hot water storage tank 2 from flowing out from the circulation adapter 25 at a high temperature in the initial stage. I can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bath heating device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation according to the embodiment of the present invention.

[Explanation of symbols]

1 ... Heating can 2 ... Hot water tank 3 ... fan 4 ... Electromagnetic pump 5 ... Nozzle 6 ... Spark plug 7 ... CdS 8 ... Water quantity sensor 9 ... Hot water temperature sensor 10 ... Water pipe 11 ... Hot water supply pipe 12 ... Kerosene supply pipe 13 ... Burner 14 ... Inlet temperature sensor 15 ... Hot water tank outlet temperature sensor 16. Mixed hot water temperature detection sensor 17 ... Bypass pipe 18 ... Mixing valve 19 ... Dewatering pipe 20 ... Bath heat exchanger 21 ... Circulation pump 22 ... Bath temperature sensor 23 ... Flow rate detector 24 ... Circulation piping 25 ... Circulation adapter 26 ... Bathtub 27 ... Three-way valve 28 ... First bypass pipe 29 ... Second bypass pipe

Claims (5)

[Claims] 1. A heating can body having a hot water storage tank, a circulation pump for sucking and circulating hot water in the bath, and a bath for indirectly heating the hot water from the circulation pump by exchanging heat with the hot water in the hot water storage tank. A heat exchanger, the bathtub and the bath heat exchanger are connected, and one end is connected between the bath heat exchanger and the circulation pump in one pipeline having a circulation pump in the middle, and the other without the circulation pump. Of the first bypass pipe having the other end connected to the pipe passage, and the hot water in the bathtub provided at either of the connecting portions of the first bypass pipe and the two pipe passages to the bath heat exchanger side. A three-way valve for switching the flow path to the side of the first bypass pipe, and a flow rate detection unit provided between the bath and the three-way valve for determining the presence or absence of circulation, and the circulation pump One end is connected between the three-way valves and the other pipe has no circulation pump. A second bypass pipe that connects the other end to the passage and short-cuts without passing through the three-way valve according to the opening degree of the three-way valve, and controls the opening degree and / or rotation speed of the three-way valve. Bath heating device. 2. The bath heating apparatus according to claim 1, wherein the inner diameter of the second bypass pipe is smaller than the inner diameters of the both pipelines. 3. The bath heating apparatus according to claim 1 or 2, wherein the opening degree of the three-way valve is adjusted based on the elapsed time after the last operation of the reheating circulation pump was stopped. Bath heating equipment to be. 4. The bath heating apparatus according to claim 1, wherein the opening degree of the three-way valve is adjusted based on the hot water temperature in the hot water tank. 5. The bath heating device according to claim 1, wherein the rotation speed of the three-way valve is adjusted based on the temperature of hot water in the hot water tank.