JP3081379B2 - Bath liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas-liquid contact portion for contacting water or hot water with the exhaust of a hot water supply burner in the middle of a bath liquid supply path for supplying water or hot water. Or supply control means for controlling switching between a hot water supply state and a non-supply state, and blower control means for controlling a blower amount of combustion air of a fan to the hot water supply burner as the combustion amount of the hot water supply burner increases. The present invention relates to a bath liquid supply device provided with the above.

[0002]

2. Description of the Related Art As the above-mentioned bath liquid supply device, there is a carbonated bath water supply device. In a carbonic acid bath hot water supply apparatus, water or hot water in which carbon dioxide gas in exhaust gas from a burner is dissolved is supplied to a bathtub to form a carbonic acid bath. Conventionally, when water or hot water is supplied to the bathtub, the supply control means has always been switched to the supply state. That is, when water or hot water is supplied to the bathtub, water or hot water is always supplied to the gas-liquid contact portion.

[0003]

The burner exhaust is discharged to the outside through the burner exhaust passage and the air / water contact chamber. Here, the amount of exhaust air in the exhaust path is substantially equal to the amount of combustion air blown by the fan. When the air blowing amount is small, the exhaust air amount is small, so that water droplets in the gas-liquid contact portion may flow backward to the upstream side of the exhaust passage and adhere to the wall of the exhaust passage. These water drops contain trace amounts of nitric acid and sulfuric acid formed from components in the exhaust gas. Therefore, in the above prior art,
There is a possibility that nitric acid or sulfuric acid adheres to the wall of the exhaust path and corrodes the wall of the exhaust path. SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional drawbacks described above, reduce the possibility that water droplets in the gas-liquid contact portion flow back to the upstream side of the exhaust passage, and suppress corrosion of the exhaust passage wall.

[0004]

In order to achieve this object, a characteristic configuration of the carbonated bath water heater according to the present invention is characterized in that the supply control means determines that the supply of the fan does not exceed the predetermined amount when the blower amount of the fan does not exceed a predetermined amount. It is configured to switch to the supply state when the air supply amount is switched to the supply state and the air flow rate exceeds a predetermined amount.

[0005]

The amount of air blown to ensure a sufficient amount of exhaust air to suppress the backflow of water droplets in the gas-liquid contact portion to the upstream side of the exhaust path is set in advance as a predetermined amount. When the amount of air blown by the fan does not exceed the predetermined amount, that is, when water or hot water is supplied to the gas-liquid contact portion, supply is performed when there is a risk that water droplets in the gas-liquid contact portion may flow backward to the upstream side of the exhaust path. Stop. On the other hand, when the amount of air blown by the fan exceeds a predetermined amount, that is, when there is little possibility that water droplets in the gas-liquid contact portion flow back to the upstream side of the exhaust passage even if water or hot water is sprayed on the gas-liquid contact portion. Supply.

[0006]

When the water droplets in the gas-liquid contact portion may flow backward to the upstream side of the exhaust passage, the supply of water or hot water is stopped. Therefore, the water droplets in the gas-liquid contact portion may flow back to the upstream side of the exhaust passage. Can be reduced. Therefore, corrosion of the exhaust path wall can be suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a carbonated bath water heater will be described below with reference to the drawings. As shown in FIG. 1, a bathtub 2 and a hot water supply unit A for supplying hot water to the bathtub 2
, A reheating unit B for heating bath water, a control unit C, and a remote controller R for giving a command to the control unit C.
And a gas-water contact chamber 1 as a gas-liquid contact portion. The air / water contact chamber 1 relays hot water supply from the hot water supply unit A to the bathtub 2. The hot water supply unit A includes a hot water supply heat exchanger 3 and a hot water supply burner 4, and the additional heating unit B includes an additional heating heat exchanger 5 and an additional heating burner 6.

Water supply channel W1 for supplying water to air / water contact chamber 1
A hot water supply path W2 for supplying hot water from the hot water supply heat exchanger 3 to the air / water contact chamber 1, a merging flow path W3 for supplying hot water from the water / water contact chamber 1 to the bathtub 2, and a heat exchange for additional heating with the bathtub 2. A circulation path W4 for circulating bath water with the vessel 5 is provided. The water supply channel W1 branches on the way and also supplies water to the hot water supply heat exchanger 3. In the water supply passage W1, a water amount sensor S1 for detecting a water supply amount Q to the bathtub 2 and the hot water supply heat exchanger 3, a water temperature thermistor S2 for detecting a water supply temperature Ti, and a supply state and non-supply of water to the air / water contact chamber 1. A water solenoid valve 7 for switching between the hot water supply state and a hot water supply state to the air / water contact chamber 1 is provided in the hot water supply path W2. A hot water supply thermistor S4 for detecting the hot water supply temperature Tm to the bathtub 2 in the merging flow path W3, and a circulating pump 9 and a bathtub temperature thermistor for detecting the bath water temperature in the circulation path W4. S5
And a water level sensor S6 for detecting a bathtub water level. Each of the burners 4 and 6 has a gas valve 41 and 61 for interrupting the gas supply, and a gas proportional valve 4 for adjusting the gas supply amount.
2, 62, and fans 43, 63 for blowing combustion air.

The steam-water contact chamber 1 will be described. A spray nozzle 12 for spraying water into a metal casing 11,
The filling layer 13 is mounted. The spray nozzle 12 is connected to the water supply channel W1. The filling layer 13 is formed by braiding a stainless wire into a three-dimensional lattice. Packed layer 13
An exhaust supply port 14 communicating with the exhaust passage H of the hot water supply unit A is formed on the side of the exhaust gas supply port 14. The high-temperature exhaust gas supplied from the exhaust supply port 14 is discharged from the upper exhaust discharge port 15 after heating the filling layer 13. That is, the sprayed water droplets come into contact with the exhaust gas whose heat has been deprived in the packed bed 13, dissolve the carbon dioxide in the exhaust gas, and deprive the packed bed 13 of heat. A hot water supply port 16 communicating with hot water supply path W2;
A junction 17 is formed which communicates with 3. That is,
In the air / water contact chamber 1, the water supplied from the water supply passage W1 and dissolving the carbon dioxide gas and the hot water supplied from the hot water supply passage W2 are mixed and supplied to the combined flow passage W3.

The remote controller R is provided with an operation switch 20, a hot water switch 21, a temperature setting switch 22 for setting a target temperature Ts of bathtub water, and a water level setting switch 23 for setting a target water level of the bathtub 2. ing.

The controller C is connected to a water amount sensor S1, a water temperature thermistor S2, a tap water temperature thermistor S3, a hot water supply temperature thermistor S4, a bathtub temperature thermistor S5, a water level sensor S6, and a remote controller R. And
The control unit C controls the water solenoid valve 7, the hot water solenoid valve 8, and the gas valve 4 on the basis of information set and stored in advance and various types of input information.
1, 61, the operation of the gas proportional valves 42, 62, and the fans 43, 63 is controlled. That is, the supply control means 100 and the air blowing control means 101 are configured using the control unit C.

A method for determining the amount of air blown by the fan 43 (here, the target rotation speed Ns of the fan) will be described. The target rotation speed Ns of the fan and the combustion amount Gp of the hot water supply burner 4 have a relationship shown in FIG. That is, when the combustion amount Gp is determined, the target rotation speed Ns of the fan is determined. The combustion amount Gp is
It is determined by Equation 1 below.

[0013]

Gp = Ka × (Ts−Ti) × Q + Kp × ΔT + Ki × ∫ΔTdt

The first term on the right side is a feedforward amount, and the second and third terms are feedback amounts. Here, ΔT is a deviation between the target temperature Ts and the actual detected temperature Tx, and Ka, Kp, and Ki are constants. However, the detected temperature T
There are two thermistors used for obtaining x, and one of them is selected and used. That is, when both the electromagnetic valve 7 for water and the electromagnetic valve 8 for hot water are opened and hot water is supplied to the bathtub 2, the hot water supply temperature thermistor S4 is used. On the other hand, when only the hot water electromagnetic valve 8 is opened and hot water is supplied to the bathtub 2, the tapping temperature thermistor S3 is used. When the combustion amount Gp is obtained,
The target rotation speed Ns of the fan 43 is obtained from the relationship shown in FIG.

Also, depending on the amount of combustion, the water solenoid valve 7
It is determined whether both the hot water supply electromagnetic valve 8 is opened and hot water is supplied to the bathtub 2 or only the hot water electromagnetic valve 8 is opened and hot water is supplied to the bathtub 2. That is, the calculated combustion amount is compared with a preset threshold value Gt, and when the combustion amount is large, both the water electromagnetic valve 7 and the hot water electromagnetic valve 8 are opened, and the hot water is stored in the bathtub 2. Hot water. When the combustion amount is small, only the hot water electromagnetic valve 8 is opened and hot water is supplied to the bathtub 2. Note that, for convenience, a value (calculated value G1) obtained by calculating only the first term of Expression 1 is used as the combustion amount used for this determination.

Next, the operation of the control unit C in hot water supply will be described with reference to the flowchart shown in FIG. With the operation switch 20 turned on, the hot water switch 2
When 1 is turned on, a hot water supply command is given to the control unit C. First, only the hot water electromagnetic valve 8 is opened. At this time, the water supply amount Q, the water supply temperature Ti, and the target temperature Ts are detected, and a calculation value G1 is obtained. The operation value G1 is compared with a threshold value Gt. When the calculated value G1 is larger than the threshold value Gt, the water solenoid valve 7 is also opened. When the operation value G1 is smaller than the threshold value Gt, the water solenoid valve 7 remains closed. Next, the combustion amount Gp is calculated based on Equation 1 both when the water solenoid valve 7 is open and when it is closed. Then, the target rotational speed Ns of the fan 43 is obtained from the relationship shown in FIG. The gas valve 4 is controlled so that the combustion amount of the hot water supply burner 4 and the rotation speed of the fan 43 match the combustion amount Gp and the target rotation speed Ns, respectively.
1 and the driving power of the fan 43 are controlled. The above control is continued until the target water level is reached.

[Another Embodiment] In the above embodiment, the operation value G1
Is smaller than the threshold value Gt, water is not supplied to the air / water contact chamber 1 with only the hot water electromagnetic valve 8 opened. For example, as shown in FIG. The spray path W6 is connected to the nozzle 12 and a detour W5 that bypasses the spray nozzle 12. The spray path W6 and the detour W
5 may be provided, and when the calculated value G1 is smaller than the threshold value Gt, water may be supplied to the air / water contact chamber 1 via the bypass W5. In the above embodiment, the case where the packed layer 13 is provided in the air / water contact chamber 1 is shown, but the packed layer 13 may be omitted. In the above embodiment, the embodiment in which the present invention is applied to the carbonated bath water heater is shown.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a block diagram of the overall configuration.

FIG. 2 is a flowchart of a control operation;

FIG. 3 is a diagram showing a relationship between a combustion amount and a target rotation speed.

FIG. 4 is a block diagram of the overall configuration of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas-liquid contact part 4 Hot water supply burner 43 Fan 100 Supply control means 101 Blow control means

Continued on the front page (56) References JP-A-5-137662 (JP, A) JP-A-63-259349 (JP, A) JP-A-63-165449 (JP, U) JP-A-58-120436 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 3/08 F24H 1/00 301 F24H 1/00 602

Claims (1)

(57) [Claims] A gas-liquid contact section (1) for contacting water or hot water with the exhaust of a hot water supply burner (4) is provided in the middle of a bath liquid supply path for supplying water or hot water, and the gas-liquid contact section (1) is provided. ) And a fan (43) for the hot water supply burner (4) as the amount of combustion of the hot water supply burner (4) increases. A bath liquid supply device provided with a blower control means (101) for largely controlling the blown amount of combustion air, wherein the supply control means (100) controls the blower amount of the fan (43). A bath liquid supply device configured to switch to the non-supply state when the amount does not exceed the fixed amount, and to switch to the supply state when the blowing amount exceeds a predetermined amount.