JP2598593B2 - Carbonated water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply burner in which an exhaust passage is formed so as to pass through a gas-water contact portion. As the amount of fuel supplied to the hot water supply burner increases, combustion air is blown to the hot water supply burner by a blowing means. A blower control means for largely controlling the amount of blown air is provided, and a carbonated hot water supply state in which water or hot water is supplied by passing through the air / water contact section and a general hot water supply state in which hot water is supplied without passing through the air / water contact section. The present invention relates to a carbonated water heater provided with switching means for switching between the two.

[0002]

2. Description of the Related Art In such a carbonated water heater, water or hot water is passed through a gas-water contact portion to dissolve carbon dioxide gas in the exhaust gas of a hot water supply burner into the water or hot water, and the water in which the carbon dioxide gas is dissolved is dissolved. Alternatively, hot water is supplied to a bathtub or the like, and the switching means uses a carbon dioxide hot water supply state in which hot water is supplied by passing through the air / water contact portion, and a general hot water supply without passing through the air / water contact portion. It can be switched to the hot water supply state.

[0003] In such a carbonated water heater, conventionally, the air supply control means controls the air supply amount of the combustion air to the hot water supply burner to be larger as the fuel supply amount to the hot water supply burner is larger. Is configured to control the amount of combustion air blown by the blowing means to the same value in both the carbonated hot water supply state and the general hot water supply state, and is suitable for the fuel supply amount in both the carbonated hot water supply state and the general hot water supply state. The amount of combustion air was blown.

[0004]

Therefore, in the above prior art, the concentration of carbon dioxide in the exhaust gas is substantially constant regardless of the amount of fuel supply, and the solubility of the carbon dioxide gas in the exhaust gas with respect to water or hot water is also high. , And is substantially constant regardless of the amount of fuel supply. By the way, when the amount of fuel supply to the hot water supply burner is small, the amount of generated carbon dioxide is small. Therefore, in the above-described conventional technology, when the fuel supply amount is small, the amount of carbon dioxide gas is small, and the amount of carbon dioxide gas dissolved in water or hot water is small in the carbonic acid hot water supply state. There was a problem that the carbonic acid concentration of the hot water was low.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to solve the above-mentioned problems in the prior art.

[0006]

The characteristic structure of the carbonic water heater according to the present invention is that the blower control means sets the blower amount for the same fuel supply amount as the carbonated hot water supply state more than the general hot water supply state. The point is that it is configured to be controlled to small.

[0007]

According to the above-mentioned characteristic configuration, the amount of air blown for the same amount of fuel supply is smaller in the carbonated hot water supply state than in the general hot water supply state. The concentration of the carbon dioxide gas therein can be increased as compared with the prior art. Therefore, even when the fuel supply amount is small, the concentration of carbon dioxide in the exhaust gas becomes higher than in the conventional technology, and the solubility of the carbon dioxide gas in the exhaust gas with respect to water or hot water can be increased. Alternatively, the amount of carbon dioxide dissolved in hot water can be increased.

By the way, in the general hot water supply state, it is supposed that the blowing amount is controlled to be small as in the above-mentioned carbonic acid hot water supply state. However, if the air supply amount is smaller than the amount suitable for the fuel supply amount when the fuel supply amount is small, the concentration of water vapor in the exhaust gas becomes large, and dew condensation easily occurs in a heat exchanger and the like. There is a problem that the durability of the exchanger and the like is reduced. Therefore, in order to avoid this problem, in a general hot water supply state in which it is not necessary to increase the concentration of carbon dioxide gas in the exhaust gas, a sufficient safety factor is set so that the occurrence of dew condensation on the heat exchanger or the like can be reliably prevented. The air flow is controlled to be suitable for the added fuel supply amount.

In the carbonated hot water supply state, by reducing the safety coefficient, the amount of air blown for the same fuel supply amount is made smaller than that of the ordinary hot water supply state, but the amount of air blown is made smaller than that of the general hot water supply state. Should be within a range that does not cause a problem in durability of the heat exchanger and the like.

[0010]

As a result, even when the fuel supply amount is small in the carbonated hot water supply state, the amount of carbon dioxide dissolved in water or hot water can be increased as compared with the prior art.
It has become possible to solve the above-described problem in the prior art in which the concentration of carbon dioxide in water or hot water supplied to a bathtub or the like is low.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, the overall configuration of the carbonic water heater will be described with reference to FIG.

A bathtub 2, a hot water supply unit A for supplying hot and cold water to the bathtub 2, a reheating unit B for heating the bathtub water, and a control unit C;
A remote controller R for giving commands to the control unit C, the air / water contact unit 1, and a general hot water tap 8 are provided. The air / water contact unit 1 relays the supply of hot water from the hot water supply unit A to the bathtub 2. The hot water supply unit A has a heat exchanger 3 for hot water supply.
And a hot water supply burner 4, and a reheating unit B is provided with a reheating heat exchanger 5 and a reheating burner 6, respectively.

Water supply channel W for supplying water to hot water supply heat exchanger 3
1 and a bath water supply passage W2 for supplying hot water from the outlet side of the heat exchanger 3 for hot water supply to the air / water contact portion 1. A general hot water supply passage W3 for supplying hot water from the bathtub hot water supply passage W2 to the general hot water tap 8 is branched and connected. A circulation path W4 for circulating bath water is provided between the bath 2 and the additional heat exchanger 5.

In the water supply passage W1, a water amount sensor S1 for detecting the amount of water supplied to the bathtub 2 and the heat exchanger 3 for hot water supply and a water temperature thermistor S2 for detecting the supply water temperature are provided.
A hot water temperature thermistor S3 for detecting the hot water temperature of the hot water supply heat exchanger 3 and a solenoid valve 7 for switching between a supply state in which water is supplied to the air / water contact chamber 1 and a non-supply state in which water is not supplied.
In the general hot water supply channel W3, a water flow switch S4 for detecting opening of the general hot water tap 8 is provided. Water level sensors S6 to be detected are provided respectively.

The burners 4 and 6 have gas valves 41 and 61 for intermitting gas supply, gas proportional valves 42 and 62 for adjusting gas supply, and a fan 43 as a blower for blowing air for combustion. , 63 are provided.

Next, the air / water contact portion 1 will be described with reference to FIG.

A spray nozzle 12 for spraying hot water and a packed layer 13 are mounted in a metal casing 11. Spray nozzle 12 is connected to bathtub hot water supply passage W2. The filling layer 13 is formed by braiding a stainless wire into a three-dimensional lattice. 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 packed layer 13. The high-temperature exhaust gas supplied from the exhaust gas supply port 14
Is heated and then discharged from the upper exhaust discharge port 15.
That is, the exhaust passage H is formed so as to pass through the water / water contact portion 1. The sprayed droplets come into contact with the exhaust gas whose heat has been taken away by the packed bed 13, dissolve carbon dioxide in the exhaust gas, and take away heat from the packed bed 13.

The remote controller R includes an operation switch 20, a hot water switch 21, a hot water temperature setting switch 22 for setting a target temperature Ts of bath water, a water level setting switch 23 for setting a target water level of the bathtub 2, and a general hot water supply. Each of the general temperature setting switches 24 for setting the target temperature Ts is provided.

The control section C includes a water amount sensor S1, a water temperature thermistor S2, a tap water temperature thermistor S3, and a water flow switch S.
4. Each of the bathtub temperature thermistor S5, the water level sensor S6, and the remote controller R is connected. Then, the control unit C controls the operations of the solenoid valve 7, the gas valves 41 and 61, the gas proportional valves 42 and 62, and the fans 43 and 63 based on the information set and stored in advance and various input information. As the fuel supply amount Gp to the hot water supply burner 4 increases, the hot water supply
The number of revolutions Ns of the fan 43 is controlled to be large so as to increase the amount of combustion air blown by the fan 43 with respect to the temperature, and the hot water is supplied to the bathtub 2 by passing hot water through the air / water contact portion 1. The state is switched to a general hot water supply state in which hot water is supplied to the general hot water tap 20 without passing through the air / water contact portion 1. That is,
Utilizing the control unit C, an air blowing control unit 101 and a switching unit 102 are configured.

Referring to FIG. 4, the rotation speed Ns of the fan 43
Will be described. The rotation speed Ns of the fan 43,
The fuel supply amount Gp to the hot water supply burner 4 has a relationship shown in FIG. The solid line (A) in FIG. 4 indicates the case of the general hot water supply state (A
Mode), and the broken line (b) in FIG. 4 shows the case of the carbonated hot water supply state (B mode). In the figure, G1 is the minimum fuel supply amount, G2
Is the maximum fuel supply amount, N1 is the rotation speed for the minimum fuel supply amount G1, and N2 is the rotation speed for the maximum fuel supply amount G2. That is, the rotation speed N for the same value of the fuel supply amount Gp
In the carbonated hot water supply state, s is set to be smaller than that in the general hot water supply state, so that the air blowing rate for the same fuel supply amount Gp is controlled to be smaller in the carbonated hot water supply state than in the general hot water supply state. is there.

(C) in FIG. 4 is a heat exchanger 3 for hot water supply.
Indicates the dew condensation limit at which dew condensation occurs on the surface and the like. In the case of the general hot water supply state, the rotation speed Ns takes into account a sufficient safety coefficient with respect to the dew condensation limit so that the amount of air to be blown can be reliably prevented from being generated on the heat exchanger 3 for hot water supply. It is like that. Further, in the case of the carbonated hot water supply state, the rotation speed Ns for the fuel supply amount Gp of the same value is generally reduced by reducing the safety coefficient to such an extent that the durability of the hot water supply heat exchanger 3 does not cause a problem. It is set to be smaller than the hot water supply state.

The fuel supply amount Gp is determined based on a water supply amount to the hot water supply heat exchanger 3, a water supply temperature, a target temperature Ts, and the like. After the fuel supply amount Gp is obtained, the rotational speed Ns of the fan 43 is obtained from the relationship shown in FIG. 4A in the general hot water supply state, and from the relationship shown in FIG.

Switching between the general hot water supply state and the carbonated hot water supply state will be described. When the hot water switch 21 is turned on, a carbonated hot water supply state is set. When the general hot water tap 8 is opened and the water flow switch S4 is turned on, a general hot water supply state is set. However, the general hot water supply state has priority. In other words, when the general hot water tap 8 is opened in the carbonated hot water supply state, an interrupt signal is generated, the carbonated hot water supply state is temporarily stopped, and the general hot water supply state is set. When the general hot water tap 8 is closed, the hot water supply state is restored.

Next, based on the flowchart shown in FIG. 2, the control unit C in hot water supply to the bathtub 2 (carbonated hot water supply state).
Will be described.

When the hot water switch 21 is turned on while the operation switch 20 is turned on, first, it is determined whether or not the bathtub water level has reached the set water level based on the detection information of the water level sensor S6. When the bathtub water level has not reached the set water level, the controller C is given a hot water supply command to the bathtub 2. The case where the bathtub water level has reached the set water level will be described later.

When a hot water supply command is given, first, the solenoid valve 7
Open. At this time, the fuel supply amount Gp is obtained based on the water supply amount, the water supply temperature, the target temperature Ts set by the hot water temperature setting switch 22, and the like. Then, the target rotation speed Ns of the fan 43 is obtained from the relationship shown in (b) in FIG. The output is controlled so as to achieve the obtained fuel supply amount Gp and target rotation speed Ns (B mode).

When the bathtub water level reaches the set water level, hot water supply to the bathtub 2 is stopped. After stopping the hot water supply and when the bathtub water level has reached the set water level, the circulating pump 9 is operated to determine whether or not the bathtub water temperature Tx exceeds the target temperature Ts based on the detection information of the bathtub temperature thermistor S5. To check. If not, additional heating is performed until the bathtub water temperature Tx reaches the target temperature Ts. If it does, do nothing. The above operation is executed until the hot water switch 21 is turned off.

Next, the operation of the control section C in hot water supply to the general hot water tap 8 (general hot water supply state) will be described with reference to the flowchart shown in FIG.

The general hot water tap 8 is opened and the water flow switch S
When 4 is turned on, an interrupt process is executed. First, the status such as the state of the carbonated hot water supply state is stored in the memory. still,
If it is in the carbonated hot water supply state, the electromagnetic valve 7 is closed and the hot water supply to the bathtub 2 is temporarily stopped.

Next, the fuel supply amount Gp is determined based on the water supply amount, the water supply temperature, the target temperature Ts set by the general temperature setting switch 24, and the like. Then, the target rotation speed Ns of the fan 43 is obtained from the relationship shown in FIG. The output is controlled so that the fuel supply amount Gp and the target rotation speed Ns are obtained (A mode). The above operation is continued until the general hot water tap 8 is closed. When the interrupt processing is completed, the stored status is read.

[Another Embodiment] In the above embodiment, the blowing means 4
Although the blowing control means 101 controls the rotation speed of the blowing means 43 to control the amount of combustion air blown by 3, the driving power of the blowing means 43 may be controlled.

In the above embodiment, the hot water is brought into contact with the exhaust gas of the hot water supply burner 4 of the hot water supply section A, but it may be brought into contact with water. In addition, hot water or water may be brought into contact with the exhaust gas from the reheating burner 6 of the reheating unit B.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a block diagram of the overall configuration of a carbonic water heater according to an embodiment of the present invention.

FIG. 2 is a diagram showing a flowchart of a control operation of the carbonated water heater.

FIG. 3 is a view showing a flowchart of a control operation of the carbonated water heater.

FIG. 4 is a diagram showing the relationship between the amount of fuel supplied to a hot water supply burner and the amount of combustion air blown by a blowing means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-water contact part 4 Hot-water supply burner 43 Blowing means 101 Blowing control means 102 Switching means H Exhaust path Gp Fuel supply amount

Claims (1)

(57) [Claims] 1. An exhaust passage (H) of a hot water supply burner (4) is formed so as to pass through a water / water contact portion (1), and the larger the amount of fuel supply (Gp) to the hot water supply burner (4), the more the above-mentioned. Air supply control means (101) for controlling the amount of combustion air blown by the air supply means (43) to the hot water supply burner (4) is provided, and water or hot water is passed through the air / water contact section (1) to supply hot water. A hot-water supply apparatus provided with switching means (102) for switching between a hot-water supply state in which the hot water is supplied and a general hot-water supply state in which hot water is supplied without passing through the air / water contact portion (1); However, the carbon dioxide hot water supply device is configured to control the blowing amount for the fuel supply amount (Gp) of the same value to be smaller in the carbonated hot water supply state than in the general hot water supply state.