JPH023899B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas instantaneous water heater, and particularly to a gas instantaneous water heater equipped with a heat retention operation function.

(Prior art) A conventional gas instantaneous water heater with a heat retention function connects the midway point of the hot water supply pipe and the water supply pipe with a return pipe.
A water supply pipe, a heat exchanger, a hot water supply pipe, and a return pipe form a heat preservation circulation pipe, and when hot water is not being supplied from the hot water supply equipment, water is circulated through the circulation flow pipe, and this circulating water is distributed remotely. It is heated and kept warm at the set temperature set by the temperature setting part of the controller, so that when you open a water heater, for example, a faucet, hot water at the set temperature can be immediately discharged from the water heater.

In this type of gas instantaneous water heater, the temperature set by the temperature setting section of the remote controller is
Within a predetermined range, for example from 35℃ to 75℃, you can now divide it into several stages such as lukewarm (35℃), slightly hot (60℃), hot (75℃), etc., and set it as you like. ing.

Therefore, if the set temperature is set to slightly hot or hot, there is a risk of burns because hot water at 60°C or 75°C will be immediately discharged when the water heater is opened.

To avoid this danger, it is best to keep everything at a safe temperature that does not cause burns, such as 40℃, but if you do this, it will not work until the water heater is opened and hot water at the set temperature is supplied. Since this takes some time, even if there is a slight risk of burns, it is impossible to meet the need for hot water at the set temperature to come out as soon as the hot water heater is opened.

Therefore, in order to meet the above two conflicting needs, we need a hot water heater that has a program to keep warm at a fixed, predetermined safe temperature, and a water heater that has a program to keep warm at the temperature set in the temperature setting section of the remote controller. It is conceivable to prepare two types of water heaters, but this increases the cost and is not economical.

(Problem to be Solved by the Invention) The problem to be solved by the present invention is that it is possible to carry out the heat retention operation at a fixed constant safe temperature using one program, or to set it arbitrarily using the temperature setting section of the remote controller. It is also possible to perform the test at a set temperature.

(Means for Solving the Problem) The technical means taken by the present invention to solve the above problem is to connect the midway part of the hot water supply pipe and the water supply pipe with a return pipe, and connect the water supply pipe and the heat exchanger. , a heat-retaining circulation pipe consisting of a hot water supply pipe and a return pipe is formed, a flow rate sensor and a temperature sensor are installed at appropriate places in this circulation pipe, and a pump is installed in the return pipe in the circulation pipe to prevent hot water supply from being stopped. The pump is driven by the heat retention operation input to circulate water through the circulation pipe, and the temperature inside the machine is determined based on the flow rate and temperature of the circulating water detected by the flow rate sensor and temperature sensor, and the temperature data transmitted from the remote controller. In a water heater in which the calculation means of the controller calculates the required heat load, and the adjustment amount of the adjustment means that adjusts the heat amount of the burner is controlled according to the calculation result, and the circulating water is kept at a constant temperature while hot water is not being supplied. , a means for identifying whether or not predetermined terminals in the remote controller are short-circuited; b. selected when the above-mentioned terminals are short-circuited and fixed regardless of the temperature set in the temperature setting section of the remote controller; means for transmitting the determined predetermined temperature to the calculation means as temperature data.

(Operation) According to the above-mentioned technical means of the present invention, if predetermined terminals of the remote controller are short-circuited to each other during the manufacturing stage, a heat-retaining operation is performed at a fixed safe temperature, and the short-circuit is cut off. If you do so, it will perform a warm operation at the temperature set arbitrarily using the temperature setting section of the remote controller.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The water heater is provided separately from the water heater main body A, and includes an in-machine controller b for controlling the combustion relationship of the burner 10 inside the machine. The water heater main body A burns gas supplied through a gas pipe 11 in a burner 10, and water supplied from a water supply source through a water supply pipe 2. It is heated by a heat exchanger 4 and flows through a hot water supply pipe 1 to a hot water supply appliance 12 such as a faucet.

The hot water supply pipe 1 branches a return pipe 3 from a midpoint, preferably near the hot water supply appliance 12, and connects the return pipe 3 to the water supply pipe 2.

That is, the water heater has a circulation pipe 5 configured by a water supply pipe 2, a heat exchanger 4, a hot water supply pipe 1, and a return pipe 3.

The water supply pipe 2 in the circulation pipe 5 is provided with a flow rate sensor 6 and an incoming water temperature sensor 7, the hot water supply pipe 1 is provided with an outlet hot water temperature sensor 8, and the return pipe 3 is provided with a pump 9. .

The flow rate sensor 6 detects the flow rate of water flowing through the water supply pipe 2 and sends the detected flow rate data to the signal line 13.
The data is transmitted to the in-machine controller b via the .

The inlet water temperature sensor 7 detects the temperature of the flowing water flowing into the heat exchanger 4 via the water supply pipe 2, and transmits the detected inlet water temperature data to the in-machine controller b via the signal line 14.

The outlet hot water temperature sensor 8 detects the temperature of the flowing water flowing out from the heat exchanger 4 and flowing into the hot water supply pipe 1, and transmits the detected outlet hot water temperature data to the in-machine controller b via the signal line 15.

The pump 9 rotates when an output signal is applied from the in-machine controller b via the signal line 16.
This output signal is generated when hot water supply is stopped while the warming operation switch of remote controller a is in the ON state.

The gas pipe 11 of the water heater body A is provided with an electromagnetic valve 17 for opening and closing the pipe 11 and a proportional valve 18 for proportionally controlling the amount of gas.

The solenoid valve 17 and the proportional valve 18 constitute an adjustment means for adjusting the heat amount of the burner 10, and the solenoid valve 17 is connected to the signal line 19 from the in-machine controller b.
The proportional valve 18 is intermittently opened and closed by an intermittent opening/closing signal transmitted via
The opening degree is changed by an opening degree signal transmitted from the burner 10 via a signal line 20, and the amount of heat is controlled by the amount of gas supplied to the burner 10.

On the other hand, the remote controller a is equipped with various operation parts necessary for operating the water heater, such as an operation switch 21, a heat retention operation switch 22, and a temperature setting part 23, and also has a microcomputer installed therein.

As is well known, a microcomputer basically consists of a CPU, RAM, and ROM.
A program is written to control the CPU,
The CPU processes the required external data according to this program, or exchanges data with the RAM.
The processed data is transmitted to the in-machine controller b as necessary.

That is, when the operation switch 21 is turned on, the CPU is first initialized, and the set temperature is set, for example.
The temperature is 42℃ and the temperature is not kept warm, but you can turn on the LED input/output by operating each operation key, for example, turn on the heat keeping mode.
When the hot water supply temperature is set to 75℃, it is first determined whether the hot water supply temperature is set to 75℃, then it is first determined whether the hot water supply temperature is set to 75℃.If the hot water supply temperature is set to 75℃, it is first determined whether the hot water supply temperature is set to 75℃.

On the other hand, in the case of heat retention operation, it is determined whether a predetermined terminal in the remote controller a is short-circuited, and if it is short-circuited, the temperature setting section 23
Despite the set temperature of 75℃, a predetermined fixed temperature, for example 40℃, is transmitted to the in-machine controller b as temperature data for keeping warm, and if there is no short circuit, the temperature is set in the temperature setting section 23. There is
75℃ is transmitted to controller b in the machine as temperature data for keeping warm.

A flowchart for executing the above-mentioned control is shown in FIG.

Note that whether or not there is a short circuit between the predetermined terminals is determined at the manufacturing stage.

In other words, there is a risk of burns if the temperature is kept at the set temperature of the temperature setting section 23, so in order to meet the need to keep warm at a safe temperature, the terminals are short-circuited with jumper wires etc. during manufacturing, which increases the risk of burns. Even if there is one, the jumper wire is cut at the time of manufacturing to meet the need for instant hot water at a set temperature when hot water is supplied, to break off short circuits between the terminals.

The in-machine controller b is equipped with a microcomputer, and uses its calculation means to calculate the necessary heat load F, and depending on the value, transmits an opening signal to the proportional valve 18 or sends an intermittent opening/closing signal to the solenoid valve 17. occurs.

The above-mentioned required heat load F is required to be fed back during hot water supply based on the flow rate data from the flow rate sensor 6, the incoming water temperature data from the incoming water temperature sensor 7, and the set temperature data transmitted from the remote controller a. The heat load _F1 is calculated and the necessary heat load is calculated based on the hot water temperature data from the hot water temperature sensor 8 and the set temperature data from the remote controller a.
Calculate each F ₂ and add both F ₁ and F ₂ .

Also, during heat retention operation, the above flow rate data and
Inlet water temperature data and remote controller a
Temperature data for keeping warm transmitted from For example 75
℃).

(Effects) Since the present invention has the above configuration, it has the following advantages.

(1) At the manufacturing stage, by short-circuiting the specified terminals of the remote controller, heat retention operation is performed at a fixed, predetermined safe temperature. Since it is possible to perform heat retention operation at a temperature set at A controller with the same program can meet both the need for something that keeps warm at a certain temperature, and the need for something that instantly provides hot water at the set temperature when the water heater is opened, even if there is a slight risk of burns. can do.

Therefore, there is no need to prepare two types of water heaters with separate programs to meet the above two conflicting needs, and it is possible to reduce costs and facilitate manufacturing.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of the instant gas water heater of the present invention, Fig. 2 is a schematic diagram showing the overall arrangement of the components of the instant gas water heater of the present invention, and Fig. 3 is the temperature of the warming operation. 3 is a flowchart showing data selection. 1: hot water supply pipe, 2: water supply pipe, 3: return pipe,
4: Heat exchanger, 5: Heat retention circulation pipe, 6: Flow rate sensor, 7: Temperature sensor (incoming water temperature sensor),
8: Temperature sensor (output hot water temperature sensor), 9: Pump, a: Remote controller, b: In-machine controller.

[Claims]

1 Two water heaters are installed side by side to form one appliance, and the hot water supply pipes 11 and 12 of these water heaters are connected to each other through a communication pipe 14.
In this system, the hot water supply circuit is provided in a separate area, with the downstream side of the communication pipe connecting portion of each of the hot water supply pipes being provided in a separate area. tube 1
A hot water temperature detection sensor 21 is provided in each of the hot water supply pipes 1 and 12, and a hot water supply circuit 31 or 3 following the hot water supply pipe is provided on the other hand.
2 is provided with a separate operation panel 41 or 42, and each of these operation panels has a hot water temperature adjustment knob 43 and a capacity switching knob 4.
4, the hot water temperature adjusting device 4 compares the hot water temperature set by the hot water temperature adjusting knob 43 and the signal output from the hot water temperature detection sensor 21 to set the heating capacity in the water heater to a predetermined value. The hot water supply device is equipped with a switch 5 which turns on the excitation coil 18 of the solenoid valve 17 when the capacity switching knob is switched to high capacity.

Claims (1)

A gas instantaneous water heater characterized by comprising: