JPH0330689Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention is a gas instantaneous water heater.In detail, the amount of heat required for the set hot water temperature is calculated, and from this amount of heat, the amount of gas required and the amount of air required are calculated. The present invention relates to an improvement in a gas instantaneous water heater that calculates the required amount of gas and the required amount of air, determines the burner based on the required amount of gas, and burns the large burner and/or the small burner as appropriate.

(Prior Art and its Problems) A gas instantaneous water heater will be explained with reference to FIGS. 4 to 7. First, the mechanical configuration will be explained with reference to FIG. 7.

In the figure, 29 is a water supply pipe, which is connected to a hot water pipe 31 via a heat exchanger 30, and the water supply pipe 29
is provided with a water supply temperature sensor 10 that detects the temperature of water supply and a water supply amount sensor 12 that detects the amount of water supply, and the hot water supply pipe 30 is provided with a water supply temperature sensor that detects the temperature of hot water supply.

A small burner 1, a large burner 2, and a fan 4 are provided below the heat exchanger 30, and
Each burner 1, 2 is provided with a proportional valve 1a, 2a and a solenoid valve 1b, 2b, respectively, and is connected to a gas supply pipe 32.

In the figure, reference numeral 11 denotes an operation section for setting the temperature of hot water, and is electrically connected to the control device 14.

Next, the configuration of the control device 14 and the connection configuration with each part will be explained with reference to FIG.

The control device 14 includes a burner drive control section 3, a fan drive control section 5, a burner judgment section 6, a gas amount/air amount calculation section 7, a feedback amount calculation section 8, a feedback amount calculation section 9, and the like.

The water supply temperature sensor 10, the operation section 11, and the water supply amount sensor 12 are each connected to the feedback amount calculation section 8, and the operation section 11, the water supply amount sensor 12, and the water supply temperature sensor 13 are each connected to the feedback amount calculation section 9. Connected.

The feed forward amount calculation unit 8 calculates the required amount of heat from the input water supply temperature, set temperature, and water supply amount, and calculates this required amount of heat to the gas amount and air amount calculation unit 7.
input to

The feedback amount calculation unit 9 calculates the required amount of heat based on the hot water supply temperature during tapping, the set temperature, and the water supply amount, and calculates the required amount of heat by using the gas amount and air amount calculation portion 7.
input to

The gas amount and air amount calculation unit 7 calculates the required gas amount and the required air amount based on the required heat input from the calculation units 8 and 9, and inputs them to the burner determination unit 6.

The burner discrimination section 6 discriminates the burner to be used for combustion based on the required gas amount and air amount. For example, if the required amount of heat is small, the small burner 1 is used, and if the required amount of heat is medium, the small burner 1 and the large burner 2 are used together. A burner drive control section 3 and a fan drive control section 5 are connected to the burner discrimination section 6, respectively.

The fan drive control section 5 drives the fan 4 during combustion in the burners 1 and 2, and the fan 4 allows ventilation to the burners 1 and 2.

The burner drive control unit 3 is connected to the small burner 1 and the large burner 2, and each burner 1, 2 is provided with a proportional valve 1a, 2a, a solenoid valve 1b, 2b, an igniter, and a flame sensor. .
The burner drive control section 3 adjusts the proportional valve of the burner discriminated by the burner discriminator 6 to ignite the burner with an igniter or repeat ignition/extinguishing.

The small burner 1 is equipped with two combustion gas ejection pipes, and when the required amount of heat is small, this small burner 1 alone is sufficient.

Large burner 2 is equipped with five combustion gas ejection pipes, and if the required amount of heat is medium, use this large burner 2.
If the required amount of heat is larger, use burner 1,
2 are jointly burned.

Next, an example of the operation of the preceding example will be explained with reference to FIG. 5. In this operation, while the small burner 1 is being burned, the amount of hot water supplied increases and only the large burner 2 is burned.

First, the small burner 1 is combusted 20, and the feedback amount is finally calculated to control the proportional valve of the small burner 1 21.

When the amount of water supplied is increased by opening a faucet or the like 22, the feed forward amount calculation unit 8 calculates the required heat amount, and the gas amount air amount calculation unit 7 calculates the required gas amount and the required air amount 23.

Next, the burner discriminator 5 checks whether one small burner is sufficient to burn 24, and if one small burner is burned, two burners are burned.
Return to step 1, and if the combustion of one small burner is insufficient, check whether the combustion of two large burners is a joint combustion of burners 1 and 2 (25).

In the case of joint combustion of burners 1 and 2, the large burner 2 is ignited 26, and the proportional valves of each burner 1 and 2 are controlled 2
8.

When shifting to combustion in the large burner 2, the small burner 1 is extinguished 27, the large burner 2 is ignited 26, and the proportional valve of the large burner 2 is controlled 28.

The preceding example has the following drawbacks.

In FIG. 5, after extinguishing the small burner 1 27,
Since there is an unburned time of 28 hours until the large burner 2 is ignited, the temperature of the hot water drops significantly at that time, as shown in FIG. 6, making it uncomfortable to use.

The transition of combustion from small burner 1 to large burner 2 occurs not only when the amount of hot water increases as described above, but also when the set temperature is raised during hot water taping, and even in such cases, once the hot water tap temperature has increased, I feel depressed.

(Technical Problem) The technical problem to be solved by the present invention is that when transitioning from small burner combustion to large burner combustion in a gas instantaneous water heater as described above, the large burner is ignited first, and then the small burner is ignited. The purpose is to eliminate the unburned time by extinguishing the fire.

(Configuration) The instant gas water heater of the present invention calculates the amount of heat required for the set hot water temperature by adjusting the water supply temperature, hot water pipe temperature,
Calculate based on the amount of water supply, calculate the required gas amount and required air amount from this required heat amount, select a large burner and/or small burner based on the required gas amount and required air amount, and set the required amount for each burner. In a gas instantaneous water heater that burns a large burner and a small burner individually or jointly by adjusting the opening of a proportional valve and the rotation speed of a combustion fan, the amount of heat required increases during combustion of the small burner. The present invention is characterized in that an auxiliary burner drive control section that first ignites the large burner and then extinguishes the small burner when transitioning to large burner combustion is connected to each of the large burner and the small burner.

(Example) An example of an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Components having the same configuration as those of the preceding example shown in FIGS. 4 to 7 are designated by the same reference numerals and the explanation thereof will be omitted. In particular, the mechanical configuration is the same as in FIG.

To explain the configuration of this embodiment with reference to FIG. 1, a main burner drive control section 3a and a sub-burner drive control section 3b are provided in place of the burner drive control section 3 of FIG. 4, and the other configurations are as follows. This is the same as the previous example shown in FIG.

The auxiliary burner drive control section 3b is connected to the small burner 1 and the large burner 2, and when the burner discrimination section 6 changes from small burner 1 combustion to large burner 2 combustion (small burner combustion → large burner combustion), Burner 2
The small burner 1 is controlled so as to be ignited and then extinguished. The delay time from igniting the large burner 2 to extinguishing the small burner 1 is set so that the drop in water temperature is minimized.

The main burner drive control section 3a controls combustion other than those described above.

Small burner extinguishing → Small burner ignition (combustion) Large burner extinguishing → Large burner ignition (combustion) Small and large burner extinguishing → Small and large burner ignition (combustion) Small burner extinguishing → Small and large burner ignition (combustion) Large burner extinguishing → Small and large burner ignition (combustion) The above-described combustion transition is an ignition or extinguishing operation, and no control such as the sub-burner drive control section 3b is required.

In the case of large burner combustion → small burner combustion, the required amount of heat decreases, so after large burner 2 is extinguished, small burner 1 is ignited, as in the previous example.

Next, the operation of this embodiment will be explained with reference to FIG. 2. It is as if 26 and 27 in FIG. 5 were replaced.

If small burner 1 combustion becomes joint combustion of small and large burners 1 and 2, 25, ignite large burner 2 and
6', 28 for controlling the proportional valves 1a, 2a;

When the small burner 1 combustion changes to the large burner 2 combustion, the large burner 2 is ignited 25, the small burner 1 is extinguished 27, and the proportional valve 2a is controlled 28.

FIG. 3 shows the outlet temperature characteristics of this example. Second
Since there is no unburned time as shown at 26 and 27 in the figure, the drop in hot water temperature in FIG. 3 is considerably improved compared to that in FIG. 6.

(action, effect) According to the present invention, there are the following functions and effects.

Proportional valves are provided for each of the large and small burners, as well as combustion fans, and feed forward and feedback control of these can be realized, making it possible to more accurately supply hot water at a set temperature.

Furthermore, when transitioning from small burner combustion to large burner combustion, the large burner is first ignited and then the small burners are extinguished, so that no unburned time is lost.

Therefore, the drop in water temperature can be minimized and it is comfortable to use.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a flowchart of the same, Fig. 3 is a temperature characteristic diagram of the same, and Fig. 4 is a diagram of the same.
This figure is a block diagram of the previous example, FIG. 5 is a flowchart of the same, FIG. 6 is a hot water temperature characteristic diagram, and FIG. 7 is a configuration diagram showing the mechanical configuration of the same. 1...Small burner, 2...Large burner, 3a...Main burner drive control section, 3b...Sub burner drive control section.

Claims (1)

[Scope of utility model registration request] The amount of heat required for the set hot water temperature is determined by the water supply temperature,
Calculations are made based on the water supply temperature and water supply amount, and the required gas amount and air amount are calculated from this required heat amount.
The large burner and/or small burner are selected based on the required amount of gas and air, and the opening degree of the proportional valve provided for each burner and the rotational speed of the combustion fan are adjusted. In a gas instant water heater that burns each burner individually or in combination, when the required heat increases during small burner combustion and shifts to large burner combustion, the auxiliary burner is driven to ignite the large burner first and then extinguish the small burner. A gas instantaneous water heater in which a control unit is connected to a large burner and a small burner.