JP3211517B2 - Automatic hot water bath equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic hot-water supply bath apparatus which can simultaneously supply general hot water for supplying water to a caran or a shower or the like and bath water for supplying hot water to a bathtub.

[0002]

2. Description of the Related Art A conventional automatic hot water supply bath apparatus has a configuration shown in FIG.

[0003] The automatic hot water supply bath device is provided with a hot water supply circuit A ₁ of hot water, etc. to Curran a shower or to heat the water from the water supply. The hot water supply circuit A ₁ is a so-called bypass mixing system be of, between the inlet water channel e and hot water passage b connected before and after the heat exchanger d are short-circuited by the bypass g, the bypass passage g Mixing valve at the connection point with the hot water path b
h is provided. Then, than mixing valve h of the hot water supply circuit A ₁ one end of the bath落込circuit i is connected to the downstream side, the other end of the bath落込circuit i are not shown for reheating while circulating hot water of the bath It is connected in the middle of the reheating circuit. Here, j is a gas burner for heating the heat exchanger d.

[0004] In this conventional apparatus, generally hot water for hot water supply to the Callan a like, if performed simultaneously and bath hot water supply for hot tension with hot water to outside the drawing bath, heated by the heat exchanger d of the hot water supply circuit A ₁ Relatively high-temperature hot water and cold water that has passed through the bypass path g are mixed by the mixing valve h. Then, the hot water having the desired temperature is supplied as it is to the curan a as it is, and part of the hot water is branched off to the bath drop-in circuit i side and dropped into the bathtub via a reheating circuit (not shown).

[0005]

[SUMMARY OF THE INVENTION Incidentally, apparatus of the configuration shown in FIG. 2, although it is possible to simultaneously use the common hot water supply and a bath water heater, is tapped via a mixing valve h of the hot water supply circuit A ₁ Since the hot water is simply branched into two and supplied to the cara a and the bathtub, there is a problem that hot water having a temperature suitable for each of the general hot water supply and the bath hot water supply cannot be supplied.

For example, if priority is given to the general hot water supply, when the outlet temperature of the general hot water supply is set lower, low-temperature hot water is filled in the bathtub. Conversely, if the tap water temperature of the general hot water supply is set to a high temperature, the hot tub will be filled with hot water in the bathtub, so the water must be poured separately into the bathtub to lower the temperature. In any case, extra time and effort are required. Similarly, even when priority is given to bath hot water supply, a desired tapping temperature cannot be obtained in general hot water supply, and the usability at the time of simultaneous use is poor.

In order to solve such a problem, the present inventors have provided an apparatus having a configuration shown in FIG. 3 (for example, see Japanese Patent Application No. 5-128984).

[0008] The automatic hot water supply bath device is different from the apparatus shown in FIG. 2, the way to the mixing valve h of pouring path b of the hot water supply circuit A _2, together with the bath落込circuit i are connected, entering waterways e From the bath diversion path m, the bath diversion path m is connected to the bath diversion circuit i, and the mixing valve is connected to the connection point of the bath diversion bypass m with the bath diversion circuit i.
There is a feature in the configuration in which n is provided.

[0009] In the apparatus shown in FIG. 3, when performing general hot water and the bath hot water supply simultaneously, relatively mixed with cold water passing through the hot water and the bypass passage g heated by the heat exchanger d of the hot water supply circuit A ₂ Mixed by valve h. Then, the hot water having the temperature adapted to the general hot water supply is directly supplied to Karan a or the like. Part of the hot water heated by the heat exchanger d of the hot water supply circuit A _2, branched off to the bath落込circuit i, is mixed with cold water passing through the bypass passage m for bath落込by mixing valve n. Then, the hot water having the temperature adapted to the hot water supply is dropped into the bathtub via the bath drop-in circuit i and a part of the additional heating circuit (not shown).

As described above, in the apparatus shown in FIG. 3, hot water having a temperature corresponding to each set temperature of the general hot water supply and the bath hot water supply is obtained, so that the convenience in simultaneous use is improved.

However, the apparatus shown in FIG. 3 requires separate mixing valves h and n for adjusting the outlet temperature of the general hot water supply and the bath hot water, and the mixing valves h and n are relatively expensive. Therefore, considering the frequency of simultaneous use, the entire apparatus becomes expensive.

The present invention has been made in view of the conventional problems as described above. Even when general hot water supply and bath hot water supply are performed at the same time, hot water can be discharged at an individual set temperature.
It is another object of the present invention to realize this with an inexpensive system.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a hot water supply circuit for heating incoming water with a heat exchanger and discharging hot water, and a reheating circuit for reheating while circulating hot water in a bathtub. The following configuration is adopted in an automatic hot water supply bath apparatus including a hot water supply circuit and a hot water supply circuit that connects the hot water supply circuit and the hot water supply circuit to drop hot water from the hot water supply circuit into the bathtub through the hot water supply circuit.

That is, according to the present invention, the bypass side connects the inlet side and the outlet side of the heat exchanger of the hot water supply circuit, and the connection point of the bypass path with the outlet side of the heat exchanger or the bypass path. On the way, a temperature control means for adjusting the mixing ratio of hot water from the heat exchanger and cold water from the bypass path is provided,
The bath drop circuit is connected upstream of a connection point of the hot water supply circuit with the hot water outlet side with the bypass passage, and the water inlet side of the heat exchanger and the bath drop circuit are connected by a bath drop bypass passage. On the other hand, in a simultaneous use mode of a general hot water supply for supplying hot water to a caran or the like and a bath water supply for supplying a hot water to a bathtub, the temperature of the hot water obtained by mixing the hot water from the heat exchanger and the cold water from the bypass path for dropping the bath is used. The heating amount of the heat exchanger is set so as to reach the set temperature, and the temperature control means is set so that the temperature of the hot water obtained by mixing the hot water discharged from the heat exchanger and the cold water from the bypass becomes the set temperature of the general hot water supply. Control means for controlling each of them in cooperation with each other are provided.

[0015]

In the above configuration, when the general hot water supply and the bath hot water supply are performed simultaneously, the hot water that has been heated by the heat exchanger of the hot water supply circuit and then branched to the bath drop circuit is mixed with the cold water from the bath drop bypass path. They are mixed at a certain ratio. Therefore, the control means controls the heating amount of the hot water supply circuit such that the mixed hot water temperature becomes a temperature suitable for bath hot water supply. In other words, the heating amount control of the hot water supply circuit is such that the temperature of the bath hot water is prioritized over the temperature of the general hot water supply. Therefore, next, the control means controls the temperature control means so that the temperature of the hot water obtained by mixing the hot water from the hot water supply path and the cold water from the bypass path becomes a temperature suitable for general hot water supply. Thereby, hot water having a temperature individually set in advance according to the general hot water supply and the bath hot water supply is supplied.

[0016]

FIG. 1 is a circuit diagram of an automatic hot water supply bath apparatus according to an embodiment of the present invention.

The automatic hot water supply bath apparatus of this embodiment mainly comprises a hot water supply circuit A, a reheating circuit B, a bath drop circuit C, and a control section D.

The hot water supply circuit A is for heating the incoming water from the water supply system to supply hot water to the kitchen curan 1 and the like.
A heat exchanger 2 is provided, and a water inlet 3 and a hot water outlet 4 connected before and after the heat exchanger 2 are connected by a bypass 6.
At a connection point between the bypass 6 and the tapping path 4, there is provided a mixing valve 8 as a temperature control means for mixing the hot water heated by the heat exchanger 2 and the cold water from the bypass 6. Note that, instead of the mixing valve 8, a bypass valve capable of adjusting the flow rate can be provided in the middle of the bypass passage 6.

Further, in this embodiment, one end of the bath drop-in bypass 10 is connected to the water inlet 3 of the hot water supply circuit A, and the other end of the bath drop-in bypass 10 is connected to the bath drop-in circuit C.

Further, in the hot water supply circuit A, a water sensor 12 for detecting the amount of water entering the heat exchanger 2 and a temperature sensor 14 for detecting the temperature of incoming water are provided in the water inlet channel 3 from the heat exchanger 2 to the outlet channel 4. A temperature sensor 16 for detecting the temperature of the hot water is provided, and an overflow prevention valve 18 and a temperature sensor 20 for detecting the temperature of the mixed hot water are provided downstream of the mixing valve 8.
The heat exchanger 2 is provided with a gas burner 22 for heating the heat exchanger 2 and a gas proportional valve 24 for controlling a gas amount.

The reheating circuit B is for reheating while circulating the hot and cold water in the bathtub E. The reheating circuit B includes a circulation pump 26 for forced circulation and a heat exchanger 28 for reheating, and heat downstream of the circulation pump 26 is provided. At a position on the way to the exchanger 28, a temperature sensor 30 for detecting the reheating temperature and a three-way switching valve 32 for selecting disconnection from the bath drop circuit C are provided.
For the heat exchanger 28, a gas burner 3 for heating the heat exchanger 28
4 are provided. The bath drop circuit C is for connecting the hot water supply circuit A and the additional heating circuit B to drop hot water into the bathtub E. One end of the bath drop circuit C is provided by the mixing valve 8 provided in the tapping path 4 of the hot water supply circuit 1. Is connected to the upstream side, and the other end is connected to the three-way switching valve 32 of the reheating circuit B. In the middle of the circuit, an on-off valve 36, a water amount sensor 38 for detecting the amount of water dropped into the bathtub E, A temperature sensor 40 for detecting a hot water temperature, an overflow prevention valve 42, an on-off valve 44, and a hopper 46 are sequentially provided.

The control section D constitutes the control means in the claims, and the temperature sensors 14, 16, 2 provided in the hot water supply circuit A, the additional heating circuit B and the bath drop-in circuit C.
Based on detection signals from the water sensors 0, 30, 40 and the water sensors 12, 38, the operation of each of the movable parts of the valves 8, 18, 32, 42, 44 and the circulating pump 30 is controlled. The combustion control is performed by adjusting the opening degree of the fuel cell.

Next, a description will be given of a hot water supply operation in the automatic hot water supply bath having the above-described configuration, in which general hot water supply and bath hot water supply are simultaneously performed.

(1) In case of general hot water supply In the case of general hot water supply, the control unit D closes the on-off valve 36 of the bath drop-in circuit C while setting the general hot water supply input from a setting device (not shown) in advance. Temperature Tsq, hot water supply circuit A
Of water entering the heat exchanger 2 by the temperature sensor 12, the amount of water entering the heat exchanger 2 by the temperature sensor 12, and the temperature sensor 1
6, a gas supply amount G ₁ for heating the heat exchanger 2 of the hot water supply circuit A based on the hot water temperature Th from the heat exchanger 2.
Is determined based on the following equation.

G₁= Qc ・ (Tsk₁−Tc) / 25 + Kp₁・ Qc ・ (Tsk₁−Th) + Ki₁・ Σ {Qc ・ (Tsk₁−Th)} where the first term on the right side is the feedforward control amount, 2
Terms and 3 are feedback control quantities, and Tsk₁Is hot exchange
Target value of tapping temperature of exchanger 2, Kp₁Is the proportionality coefficient, Ki ₁Is the product
The target value Tsk₁Is given by the following equation.

Tsk ₁ = ρ ₁ · (Tsq−Tc) + Tsq where ρ ₁ is a steady distribution ratio of hot and cold water.

The control unit D heats the heat exchanger 2 under the gas supply amount G ₁ given by the equation, and, based on the detection output of the temperature sensor 20, connects the hot water from the heat exchanger 2 with the bypass. The mixing valve 8 is adjusted so that the mixing temperature with the cold water from the passage 6 becomes the set temperature Tsq.

Thus, the preset temperature Tsq (= T
The hot water that has become m) is supplied to the curan 1 and a shower (not shown).

(2) In the case of bath water supply In the case of bath water supply, the control unit D opens the open / close valve 36 of the bath drop-in circuit C and the three-way switching valve 32 of the additional heating circuit B.
Is switched to communicate with the bath drop-in circuit C.

Further, the control section D includes a set temperature Tsf for bath water supply, a water input amount Qc detected by the water amount sensor 12 of the hot water supply circuit A, and a bath drop water amount Qf detected by the water amount sensor 38 of the bath drop circuit C. A gas supply for heating the heat exchanger 2 of the hot water supply circuit A based on the incoming water temperature Tc detected by the temperature sensor 12 of the hot water supply circuit A and the drop temperature Tf detected by the temperature sensor 40 of the bath drop circuit C. It determined based on the amount G ₂ in the following equation.

G ₂ = Qf · (Tsf−Tc) / 25 + Kp ₂ · Qf · (Tsf−Tf) + Ki ₂ Σ {Qf · (Tsf−Tf)} Here, one term on the right side is a feedforward control amount. , 2
Terms and 3 are feedback control amounts, Kp ₂ is a proportional coefficient, and Ki ₂ is an integral coefficient.

The control unit D controls the gas supply amount G ₂ given by the equation so that the drop temperature Tf matches the set temperature Tsf.

Thus, the bath drop circuit C from the hot water path 4
The hot water led to the chiller and the cold water from the bath drop-in bypass 10 are mixed at a fixed ratio, and a predetermined temperature Tsf (= T
f) The hot water is supplied from the three-way switching valve 32 to the reheating circuit B.
Get inside and drop into bathtub E.

(3) Simultaneous use of general hot water supply and bath hot water supply When the general hot water supply and bath hot water supply are performed simultaneously, the control unit D opens and closes the on-off valve 36 of the bath drop circuit C,
The three-way switching valve 32 of the additional heating circuit B is switched to communicate with the bath drop-in circuit C.

The control section D includes a set temperature Tsq for general hot water supply, a set temperature Tsf for bath hot water supply, and a hot water supply circuit A.
, The water input amount Qc detected by the water amount sensor 12, the water amount Qf detected by the water amount sensor 38 of the bath depression circuit C,
Inlet water temperature T detected by temperature sensor 12 of hot water supply circuit A
c, and based on落込temperature Tf detected by the temperature sensor 40 of the bath落込circuit C, and determined on the basis of the gas supply amount G ₃ for heating the heat exchanger 2 of the hot water supply circuit A in the following equation.

[0036] G ₃ = a _{Qc · (Tsk 3 -Tc) /} 25 + Kp 3 · Qf · (Tsf-Tf) + Ki 3 · Σ {Qf · (Tsf-Tf)} Here, one of the right side feedforward control Quantity, 2
The terms Tsk ₃ are the feedback control amounts, Tsk ₃ is the target value of the tapping temperature of the heat exchanger 2, Kp ₃ is the proportional coefficient, Ki ₃ is the integral coefficient, and the target value Tsk ₃ is given by the following equation. .

Tsk ₃ = ρ ₃ · (Tsf−Tc) + Tsf where ρ ₃ is a fixed distribution ratio of hot water and hot water from the heat exchanger 2 of the hot water supply circuit A flowing into the bath drop circuit C and a bypass for bath drop. The flow rate is determined by the flow rate of the cold water flowing into the bath drop circuit C from the road 10.

[0038] Then, the control unit D, as落込temperature Tf becomes equal to the set temperature Tsf, controls the gas supply amount G ₃ given by equation.

Thus, the bath 4 can be connected to the bath 4
The hot water led to the chiller and the cold water from the bath drop-in bypass 10 are mixed at a fixed ratio, and a predetermined temperature Tsf (= T
f) The hot water is supplied from the three-way switching valve 32 to the reheating circuit B.
Get inside and drop into bathtub E.

The control unit D controls the mixing valve 8 based on the detection output of the temperature sensor 20 so that the mixed hot water temperature Tm matches the set temperature Tsq, and the hot water from the heat exchanger 2 is bypassed. Adjust the mixing ratio with the cold water from channel 6. In this way, hot water having a preset temperature Tsq (= Tm) is supplied to the curan 1 or a shower (not shown).

In the equation, the hot water temperature Tf when the hot water from the bath drop circuit C and the cold water from the bath drop bypass path 10 are mixed becomes the set temperature Tsf of the bath hot water supply.
And sets a target value Tsk ₃ which is tapped from the heat exchanger 2 of the hot water supply circuit A. That is, the temperature of the bath hot water supply Tsf (= Tf) is determined gas supply amount G ₃ so as to obtain immediately after start-up of the combustion control, setting the first bath hot-water supply temperature Ts
If the goal is to obtain f, the controllability of the control may be poor, and the hot water supply temperature Tm of the general hot water supply may decrease. In this case, the following equation may be applied instead of the equation.

[0042] _{G 3 '= Qc · (Tsk} 1 -Tc) / 25 + Kp 3 · Qf · (Tsf-Tf) + Ki 3 · Σ {Qf · (Tsf-Tf)}' However, Tsk ₁ = ρ ₁ · ( Tsq−Tc) + Tsq In this case, the desired hot water temperature Tsq (= T
q) is obtained, while the bathtub E has a desired hot water temperature Tsf (= Tf).
Slightly higher hot water will be supplied. But,
Since the bathtub E has a large storage capacity, the subsequent gas supply amount G
If the temperature is converged to the set temperature by the control of ₃ ', the fluctuation of the hot water temperature of the bathtub E is extremely small and does not pose a problem.

If the on-off valve 36 of the bath drop circuit C is closed and the three-way switching valve 32 of the reheating circuit B is switched to communicate with the bath drop circuit C, only cold water can be dropped into the bathtub E. Since it is possible, there is an advantage that it is not necessary to separately provide a water supply circuit.

[0044]

According to the present invention, hot water at a desired set temperature can be discharged even when general hot water supply and bath hot water supply are used simultaneously. For this reason, convenience at the time of simultaneous use is improved.

In addition, since it is not necessary to separately provide temperature control means such as a mixing valve for general hot water supply and bath hot water supply for temperature control as in the prior art, this system can be realized without increasing the cost. There are advantages such as possible.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an automatic hot water supply bath apparatus according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a main part of a conventional automatic hot water supply bath apparatus.

FIG. 3 is a circuit diagram showing a main part of another conventional automatic hot water supply bath apparatus.

[Explanation of symbols]

A: hot water supply circuit, B: reheating circuit, C: bath drop circuit, D ...
Control unit (control means), E: bathtub, 1 ... currant, 2 ... heat exchanger, 6 ... bypass path, 8 ... mixing valve (temperature control means), 10 ... bypass path for bath drop.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24H 1/00 602 F24H 1/10 302

Claims (1)

(57) [Claims] 1. A hot water supply circuit for heating incoming water with a heat exchanger to discharge hot water, a reheating circuit for reheating while circulating hot water in a bathtub, and a hot water supply circuit connecting between the hot water supply circuit and the reheating circuit. An automatic hot water supply bath device having a bath dropping circuit for dropping hot water from a hot water supply line into a bath tub via a reheating circuit, the hot water supply circuit having a heat exchanger having an inlet side and a hot water side connected by a bypass path. A temperature control means for adjusting a mixing ratio of hot water from the heat exchanger and cold water from the bypass passage is provided at a connection point of the bypass passage with a tapping side of the heat exchanger or in the middle of the bypass passage; The bath drop-in circuit is connected upstream of a connection point with the bypass on the outlet side of the circuit, and further, the water inlet side of the heat exchanger and the bath drop-in circuit are connected by a bath drop-in bypass. , General hot water for hot water and hot water for bathtub In the simultaneous use mode with the hot water supply, the heating amount of the heat exchanger is adjusted so that the temperature of the hot water obtained by mixing the hot water from the heat exchanger and the cold water from the bath drop-off bypass path becomes the set temperature of the hot water supply. ,
Further, a control means for controlling the temperature control means in conjunction with each other so that the hot water temperature obtained by mixing the hot water coming out of the heat exchanger and the cold water from the bypass becomes the set temperature of the general hot water supply. Automatic hot water supply bath equipment.