KR930000632B1 - Water-flow detection driving apparatus - Google Patents

Abstract

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Description

Water Flow Detection Starter

1 is a circuit diagram showing a quantity detection circuit of this embodiment.

2 is a schematic configuration diagram showing a gas combustion hot water heater of this embodiment.

3 is a block diagram showing a control device of the present embodiment.

4 is a time chart for explaining the operation of this embodiment.

* Explanation of symbols for main parts of the drawings

36: Quantity sensor (quantity detecting means) 66: Quantity detecting circuit (switching means)

72: F / V conversion circuit (F / V conversion means)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water flow detection type starter for starting the operation of a device by detecting water flow, and more particularly, to a water flow detection type start device for detecting a quantity of water and starting the device based on the detected amount.

Conventionally, in a water supply facility such as a hot water heater, it is practically convenient for the combustion device to operate automatically when water is used to operate the combustion device. In the past, when a mechanical water flow switch is used and a quantity of water flows over a certain amount, The circuit is closed to start the operation of the combustion device.

Since this water flow switch is mechanical, on the contrary, when the circuit is opened, the flow rate must be reduced to a much smaller amount than when it is closed. Therefore, there is a difference between the flow rate for starting the combustion apparatus and the flow rate for stopping the combustion apparatus. The operation state and the operation stop state of are stable respectively.

However, in recent years, in the hot water heater, the amount of combustion of the combustion apparatus is controlled in response to the quantity of water supplied into the heat exchanger, and the quantity of water is controlled to control the quantity of the hot water to the temperature of the user's purpose. For this reason, the water quantity sensor by rotation of the vane for detecting the water supply amount was provided. For this reason, it has been devised to start the operation of the combustion apparatus based on the quantity of water detected by the quantity sensor instead of the conventional slew switch.

However, since the output of the water quantity sensor changes continuously in response to the quantity, and the quantity is detected, the quantity of water is read from the voltage converted to F / V based on the pulse signal from the quantity sensor. Due to the change in the rotational speed of the water quantity sensor due to the small change of, or the change of the output voltage due to the F / V conversion, the start of operation is not stable and so-called chattering occurs.

For this reason, there is a problem in that it is not possible to use the water flow switch instead of the water flow switch if the combustion device is operated at a constant output.

The present invention is a control device that uses a water sensor and controls the operation of the device in response to the water detected by the water sensor, wherein the water flow detection type starting device capable of starting and stopping the operation of the device by the output of the water sensor The purpose is to provide.

The present invention provides a quantity detecting means for generating a predetermined pulse signal in response to the quantity of water passing through the water flow path, and starts the operation of the apparatus when the first pulse signal number of the predetermined pulses detected by the quantity detecting means is detected. Technical means as switching means for stopping the operation of the apparatus are employed when the number of second pulse signals representing a predetermined number of pulse signals less than the number of first pulse signals is detected.

In the water flow detection type starter of the present invention, the quantity of water passing through the water flow path is detected by the quantity detecting means, where the quantity detecting means generates a predetermined pulse signal corresponding to the quantity detected.

Further, the switching means starts the operation of the device when the number of pulse signals generated by the quantity detecting means is input as the number of first pulse signals.

In addition, the switching means stops the operation of the device when the number of pulse signals generated from the quantity detecting means is input as the number of second pulse signals lower than the number of first pulse signals.

That is, the switching means in the present invention starts the operation of the device when the first pulse signal number is input based on the number of pulse signals generated by the quantity sensor, and stops the device when the second pulse signal number is input.

At this time, since the number of the second pulse signal is less than the number of the first pulse signal, the operation of the device is not stopped unless the number of signals generated by the quantity sensor after the operation of the device is slightly reduced until the number of the second pulse signal.

Therefore, in the switching circuit, since the difference between the number of pulse signals generated by the quantity sensor and the number of first pulse signals for starting operation and the number of second pulse signals for stopping operation can be sufficiently taken, the device can be operated stably.

As a result, even if there is some water flow fluctuation, if it is within this pulse signal number, it does not affect the operation of the switching means, so that stable operation can be performed and chattering is not caused.

Next, the flow detection type starter of the present invention will be described based on the embodiment shown in the drawings.

A combustor case 10 is installed in the hot water heater case 2 of the gas-fired hot water heater 1 shown in FIG. 2, and therein, a double type for burning the fuel gas supplied by the gas supply pipe 20 therein. Burner 11 is installed.

In addition, the combustor case 10 is provided with a combustion fan 12 using a brushless direct current (DC) motor of a three-phase Y connection, and the burner 11 is connected to the combustion air supplied by the combustion fan 12. It is a forced-air combustor combusted by the combustion, and combustion exhaust gas is exhausted to the outside through the exhaust port 3.

The heat exchanger 13 connected to the water supply pipe 30 is installed above the combustor case 10, and the water passing through the inside is heated by the heat generated by the burner 11.

In the vicinity of the combustor case 10, a sparker 14 as an ignition device and a flame rod 15 as a flame detection means are provided.

In addition, the outer side of the upper part of the combustor case 10 is equipped with the temperature fuse 16 for stopping the operation | movement of this gas-fired hot water heater, because it melt | dissolves and burns when the combustor case 100 becomes high temperature by abnormal combustion. .

In addition, the gas supply pipe 20 includes a solenoid valve 21, a kettle valve 22, and a constant pressure regulator that controls the supply pressure of the fuel gas by passing the fuel gas when energizing from the upstream side. Replacement solenoid valves 24 for blocking the fuel gas to one of the proportional valve 23 and the double burner 11 in accordance with the use state are respectively provided to supply the fuel gas to the burner 11 described above.

In addition, a water discharge valve 32 having a water filter 31 is installed at an uppermost part of the water supply pipe 30, and a water quantity control valve is provided by a geared motor that adjusts the inflow of water into the heat exchanger 13 downstream thereof. 33 is provided, and the water quantity control valve 33 is provided with a potentiometer 34 for detecting the opening degree.

Then, the water whose flow rate is adjusted in the water flow control valve 33 is immediately detected by the water inlet temperature thermistor 35 installed downstream, and then the flow rate is detected by the water flow sensor 36 downstream thereof.

The water quantity sensor 36 is a water quantity detecting means of the present invention, and includes a vane not shown in the water supply pipe 30, and the vane speed corresponds to the amount of water passing through the water supply pipe 30. Since it generates a pulse signal corresponding to the number of revolutions of the van, it is possible to know the amount of water passing through the water supply pipe (30).

In addition, the water passing through the water supply pipe 30 is sent to the heat exchanger 13, wherein the heat exchanger 13 is provided with a residue safety switch 37, the fire extinguishing of the burner 11 and the water supply pipe ( When the temperature of the heat exchanger 13 abnormally rises due to deterioration due to poor timing in the control in 30), the operation is stopped.

The water supply pipe 30 downstream of the heat exchanger 13 is provided with a tapping temperature thermistor 38 for detecting the temperature of the heated water, and a boiling preventing switch 39 is provided downstream.

In addition, the water supply pipe 30 in the water heater case 2 is provided with a freeze prevention heater 40 at several places, and when the low temperature is sensed by the low temperature detection switch 41 in the water heater case 2, it is energized and cooled. Damage to the device due to freezing of the city can be prevented.

In addition, when the water pressure in the water supply pipe 30 becomes higher than a predetermined pressure, the pressure safety valve 42 for protecting the gas-fired hot water heater 1 is discharged to the lowermost part of the water supply pipe 30. Is installed. The gas combustion hot water heater 1 having the above configuration is controlled by the controller 50.

First, as shown in FIG. 3, the control device 50 is a heater circuit composed of a freeze prevention heater 40 connected to a power cord 51 connected to an outlet of indoor wiring through a low temperature sensing switch 41. And a control circuit 60 provided in parallel with the heater circuit 52. The control circuit 60 includes a safety switch 37, a temperature fuse 16, and a boiling prevention switch 39. Operated by the power supply unit 53 connected through the controller, the control device 50 includes a main controller 54 and a subcontroller 54a for operating the gas-fired hot water heater 1.

Each of these controllers includes an operation switch (not shown), an indication lamp indicating that the operation switch is in operation, a water temperature setting switch for setting the water temperature, and seven segments displaying the set water temperature by two numbers. In this seven segment, an error message specified in advance when an abnormality occurs in the control circuit 60 is displayed.

The control circuit 60 includes a sparker circuit 61, a fan circuit 62, a proportional valve circuit 63, a geared motor circuit 64, centering on a microcomputer 70 (hereinafter referred to as CPU). There are a position detecting circuit 65 and a quantity detecting circuit 66, and these circuits are subjected to predetermined control by the CPU 70.

The sparker circuit 61 causes a spark discharge in the discharge gap of the sparker 14, detects the spark discharge in the discharge gap, and sends a predetermined detection signal to the CPU 70.

In addition, the fan circuit 62 rotates the combustion fan 12 in response to a combustion demand such as a set water temperature, and detects the rotation speed by a Hall IC provided in a brushless DC motor of a three-phase Y connection. To send the detection signal to the CPU 70.

In addition, the proportional valve circuit 63 is a circuit for controlling the energization amount to the constant pressure proportional valve 23 for this, because the amount of fuel gas must be adjusted and supplied so that combustion in the burner 11 is performed at a desired air-fuel ratio. The amount of energization in the constant pressure proportional valve 23 example is controlled due to the rotational speed of the combustion fan except at the time of ignition.

In addition, the geared motor circuit 64 is a circuit for driving the geared motor connected to the volume control valve 33 for controlling the quantity of water flowing in the heat exchanger 13, and responds to the control signal. It is controlled by one opening.

The position detection circuit 65 is a circuit for analyzing signals from the potentiometer 34 provided in the water quantity control valve 33 and provided to detect the opening degree thereof.

Meanwhile, as illustrated in FIG. 1, the quantity detecting circuit 66 receives a predetermined pulse signal output from the quantity sensor 36 through the input terminal 71 to detect the quantity of water, and the F / V conversion circuit ( 72 to F / V conversion to a predetermined voltage, the F / V conversion circuit 72 generates a voltage corresponding to the number of pulse signals input from the quantity sensor 36, the output voltage is output It is sent to the CPU 70 via the terminal 73 and used as data in each control as an output voltage corresponding to the quantity.

In addition, the quantity detection circuit 66 has waveform shaping consisting of a plurality of resistors, diodes, zener diodes, capacitors, and inverters to obtain two new pulse signals indicating the start and end of the pulse signals input through the input terminal 71. A circuit 74 is provided and stabilized by a capacitor 75 having a predetermined capacity when the pulse signal number is converted into a predetermined voltage through the F / V conversion circuit 72 and then output to the switching circuit portion 76. Is output.

In the water quantity detection circuit 66, a switching circuit 76 for starting and stopping the operation of the gas-fired hot water heater 1 is provided by the pulse signal of the water quantity sensor 36 by the switching means of the present invention. It is.

At this time, the switching circuit 76 is switched by the comparator 78 to which the reference voltage is applied to the non-inverting input terminal 82, if the F / V conversion circuit (input to the inverting input terminal 79) When the output voltage at 72 is higher than the reference voltage by the power supply voltage Vc divided through the resistors 80 and 81 input to the non-inverting input terminal 82, the output of the comparator 78 is inverted. When the low level signal is generated and the predetermined voltage output from the F / V conversion circuit 72 becomes lower than the reference voltage applied to the non-inverting input terminal 82, the output of the comparator 78 becomes 'high'. 'Level, and each output signal at this time is transmitted to the CPU 70 through the output terminal 77 as a switching signal.

In addition, since the comparator 78 is equipped with hysteresis characteristics, the output of the "high" level and the "low" level are respectively generated by different output voltages of the F / V conversion circuit 72 so that switching is performed. Doing.

This is because, since the output voltage in the quantity detection circuit 66 is caused by the F / V conversion circuit 72, a chattering occurs in which the start and end of operation are repeated in a short time when the quantity is unstable and the quantity of water is not stable. In order to prevent this, when the quantity of water passing through the water supply pipe 30 is 2.5 L / min for T ₁ second (for example, 0.1-1.0 second), the device outputs a predetermined output voltage corresponding thereto. When 1.5 L / min is continued for T ₂ seconds (for example, 0.1-0.8 second), a predetermined output voltage corresponding thereto is outputted to stop the apparatus.

In addition, the CPU 70 operates the respective circuits in a predetermined order and timing in response to each setting state by a predetermined control signal input from the main controller 54 and the sub-controller 54a. Calculate the most efficient combustion method based on temperature, quantity of water, set water temperature and tapping temperature to control the amount of combustion and quantity of water.

Next, the operation of the water flow detection type starter of the present invention in the gas combustion hot water heater 1 having the above configuration will be described with reference to FIG.

First, when a user opens a tap (not shown) and starts hot water supply, the water quantity sensor 36 operates to output a predetermined pulse signal, and the water quantity detection circuit 66 detects the quantity due to the pulse number signal.

If the quantity detected by the quantity sensor 36 is gradually increased as shown by the solid line A of FIG. 4, the switching circuit 76 is gas burned as shown at time T ₁ of FIG. Assuming that the amount of time required to output the "high" level switching signal for starting the operation of the hot water heater 1 is increased to 2.5 l / min, and then the duration is tm seconds, the corresponding voltage is the F / V conversion circuit. Since it is output from 72, the switching circuit 76 is operated based on the output signal thereof, and the "low" level switching signal is output, so that the gas-fired hot water heater 1 starts operation in a predetermined sequence.

After that, when the water quantity is changed when passing through the water supply pipe 30, the changed flow rate is continuously measured by the water quantity sensor 36, and the water quantity detection circuit 66 responds to the changed flow rate so that a predetermined output signal is supplied. Is output.

However, in the switching circuit 76, the output signal is inverted so as to generate an "high" level output signal unless an output voltage corresponding to a quantity of 1.5 L / min is continued for T ₂ seconds in the quantity detection circuit 66. I never do that.

Therefore, when the quantity changes and becomes large, it will continue to operate as it is naturally.

In addition, even if the quantity is reduced due to fluctuations, the operation is not stopped unless it is 1.5 L / min or less. For example, the operation is not stopped even if the flow rate is not continued for T ₂ seconds.

Therefore, once the operation is started, the operation is continued unless the quantity fluctuates greatly, so that the gas-fired hot water heater 1 can continue the stable operation.

Subsequently, assuming that the duration time was tn seconds, with the quantity reduced and being less than 1.5 l / min so as to be represented by time tn, as shown by the solid line B in FIG. Since it is output from the circuit 72, the operation of the gas-fired hot water heater 1 is stopped because the switching circuit 76 is operated on the basis of its output signal to output the "high" level switching signal.

Thereafter, even if the quantity changes, the operation is stopped as long as it does not increase to 2.5 L / min, which is the quantity for outputting the 'low' level switching signal.

As described above, according to the present invention, in the control apparatus provided with the water quantity sensor and controlling the operation state in response to the quantity, the water quantity sensor can be used with the water flow switch function.

At that time, no chattering occurs and the device can be operated stably.

Claims (2)

Known quantity detecting means 36 for detecting a quantity of water passing through the water flow passage and generating a predetermined pulse signal corresponding thereto; When the predetermined number of pulses output from the quantity detecting means 36 is inputted as the number of first pulse signals for a predetermined time T ₁ , the operation of the device is started, and the number of second pulse signals representing the number of pulse signals smaller than the number of the first pulse signals. And a switch means (66) for stopping the operation of the device when a predetermined time (T ₂ ) is inputted. 2. The switching means (66) according to claim 1, characterized in that the switching means (66) is provided with F / V converting means (72) for generating a predetermined output voltage corresponding to the number of pulse signals generated by said quantity detecting means (36). Water flow detection type starting device.

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