JPH0769060B2 - Hot water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water hot water supply apparatus, and more particularly to a hot water hot water supply apparatus that mixes hot water with an electric mixing valve having a potentiometer.

<Prior Art> A conventional apparatus will be described with reference to FIGS. 1, 2, and 3. Electric mixing valve 40 with potentiometer 20
In a hot water supply apparatus that mixes hot water with water, a movable valve body such as a wax thermomixing valve is generally moved by an output of a drive motor 30 via a gear unit (not shown).

However, the detection range of the potentiometer 20 is often provided only in a part of the movable range of the motor 30, and the mover 21 (see FIG. 2) of the potentiometer 20 is normally detected for some reason (see FIG. 3). (See),
The motor 30 became uncontrollable and sometimes went out of control. Also, if the potentiometer 20 has a wire breakage or poor contact, it will run away for the same purpose.

Conventionally, when the mover 21 moves out of the normal detection range or when the motor goes out of control due to other reasons, the valve body or the like reaches the mechanical lock portion provided in the motor, the gear unit or the valve body portion. Once locked, the motor 30 is stopped after a certain period of time.

<Problems to be Solved by the Invention> However, in the above-described conventional technique, the motor 30 is not stopped and is not automatically restored to the normal operating state.
In order to return, the gear unit and the valve body had to be disassembled each time. However, such decomposition is not easy for an amateur.

Therefore, the present invention, if the mover of the potentiometer is out of the normal range, or if the potentiometer is broken or contact failure occurs, and the motor cannot be controlled,
An object of the present invention is to provide a hot water hot water supply device capable of returning to a normal operating state without disassembling the device.

<Means for Solving the Problems> In order to achieve the above object, the hot water supply apparatus according to the present invention is configured such that hot water and water from the hot water storage section are mixed and adjusted to a predetermined temperature by an electric mixing valve with a potentiometer to supply hot water. In the hot water heater, the input value from the potentiometer for detecting the valve body position of the electric mixing valve is a value other than the input value corresponding to the normal detection range of the potentiometer, if the value continues for a certain period of time or more, In the case where it is determined that the potentiometer is abnormal and the drive motor of the electric mixing valve is stopped and the abnormality is displayed, when the potentiometer is determined to be abnormal and the motor is stopped, , The rotation direction of the drive motor immediately before the stop is stored, and the OFF-ON reset signal of the operation switch is input. Under the condition, the drive motor is rotated once in a direction opposite to the stored rotation direction, and thereafter, while rotating in the valve body setting position direction, whether the potentiometer is abnormal or not is determined. The first feature is that a main body controller that also makes a determination is provided.

Further, in the hot water heater according to the first aspect of the present invention, instead of the condition that the OFF-ON reset signal of the operation switch is input, the hot water heater is automatically driven after the drive motor is stopped due to the abnormality of the potentiometer. A series of operations in which the motor is once rotated in the direction opposite to the direction of rotation immediately before stopping, and then, while rotating in the direction of the valve set position, it is also judged whether the potentiometer is abnormal. The second feature is that a main body controller that performs the operation once or several times is provided.

<Operation> According to the first aspect of the present invention, even if the drive motor is stopped due to an abnormality in the potentiometer, if the operation switch is once turned off and then turned on again, the drive motor is The controller automatically makes a rotation in the opposite direction to the rotation direction immediately before the stop that was stored.
After that, it is further rotated toward the valve body setting position. With this, when the abnormality of the mixing valve is light, the abnormal state of the mixing valve is actually eliminated, and further, the motor is rotated in the direction of the valve disc setting position, so that the position of the valve disc is also set. Adjustable in the direction. When the detected value of the potentiometer falls within the normal detection range, it is determined that the potentiometer is normal, and the abnormal display is also erased. Of course, if the abnormal state of the potentiometer cannot be eliminated even by the control operation by the main body controller, disassembly and repair are still necessary.

As described above, according to the first feature, the operation switch is turned off and then turned on again to automatically perform the releasing operation for releasing the abnormality of the potentiometer and the subsequent moving operation of the valve body position to the set position. , And the device for canceling the error display are carried out.Even by performing a very simple operation, it is possible to automatically eliminate the error in the potentiometer, adjust the valve to the set position, and cancel the potentiometer error display. It is convenient for

Further, according to the second aspect of the present invention, even if the drive motor is stopped due to the abnormality of the potentiometer, after the stop, the main body controller automatically makes a reverse direction to the stored rotation direction immediately before the stop. Is then rotated further in the direction of the valve body setting position, and it is determined whether or not the potentiometer is abnormal. By performing this series of automatic operations one or more times under the control of the main body controller, the abnormal state of the potentiometer can be actually resolved when the abnormal state of the potentiometer is light, and after that, the motor is set to the valve body setting position. By rotating it in the direction, the valve position is also adjusted toward the valve set position, and when the detected value of the potentiometer enters the normal detection range, the potentiometer is judged to be normal by the judgment Is also erased. As described above, according to the second feature, when the drive motor is stopped due to the abnormality of the potentiometer, the operation of releasing the abnormal state of the potentiometer and the subsequent operation of moving the valve body position to the set position are automatically performed. , And the error display is canceled, it is possible to automatically eliminate the potentiometer error, adjust the valve to the set position, and clear the potentiometer error display by performing a very simple operation. It is convenient for

<Embodiment> FIG. 1 is an overall configuration diagram of an apparatus embodying the present invention, FIG. 2 is a configuration diagram showing a relationship between a main body controller, a potentiometer, a drive motor, and an electric mixing valve, and FIG. 3 is a normal range and abnormality of the potentiometer. FIG. 4 is a diagram for explaining the range, FIG. 4 is a diagram for explaining the relationship between the voltage value indicated by the potentiometer and the normal range, FIG. 5 is a flow chart showing an example of control by the main body controller, and FIG. 6 is a potentiometer input abnormality detection by the main body controller. Is a flowchart for.

In FIG. 1 and FIG. 2, a water inlet pipe 4 and a hot water outlet pipe 5 are connected to a hot water storage part 3 of a heat exchange can body 2 heated by a burner 1. A water mixing pipe 6 is branched from the middle of the water inlet pipe 4, and the water mixing pipe 6 and the hot water outlet pipe 5 are connected to an electric mixing valve 40. Hot water mixed at a predetermined temperature is supplied through the hot water supply pipe 7.

The temperature of the hot water storage unit 3 is controlled by the main body controller 50 controlling the burner 1 according to the signal value from the thermistor 8. On the other hand, in adjusting the hot water temperature of the hot water supplied by the electric mixing valve 40, the value set by the hot water temperature setting unit 61 of the remote controller (hereinafter referred to as a remote controller) and the value input from the potentiometer 20 are input to the main body controller 50. A built-in microcomputer (hereinafter referred to as "microcomputer") 51 performs a comparison calculation, and the rotation of the drive motor 30 in the forward or reverse direction is designated. If the difference between the set value and the value from potentiometer 20 reaches within a certain range, motor 30
To stop. The drive motor 30 is a servo motor, a stepping motor, or any other motor capable of forward and reverse rotation.

The operation control by the main body controller 50 will be described in detail with reference to FIGS. 3 to 6.

Now, when an operation switch (not shown) of the remote controller 60 is turned on (step 101), the burner 1 combustion control using the thermistor 8 is started so that the hot water temperature of the hot water storage part 3 becomes a predetermined temperature (step 102). . Then, if there is no abnormality through the potentiometer input abnormality detection subroutine (step 103) and the potentiometer input abnormality determination (step 104), it is checked whether the hot water supply temperature control setting is changed by the remote controller 60 (step 105), and the change is made. For example, the setting is changed in the microcomputer (step 106). And remote control 6
The temperature control signal voltage set by the hot water supply temperature control setting unit 61 (which is also the set voltage of the valve body position) and the potentiometer
The signal voltage indicating the valve body position (position of the mover 21) from 20 is compared in the microcomputer 51, and the drive motor 30
Control the movement of (steps 107, 108). That is, when the difference exceeds a certain allowable range (-α to + α) in the positive direction, the motor 30 is normally rotated (step 109), and when it exceeds the negative direction, the motor 30 is reversely rotated (step 110). When is within the allowable range, the motor 30 is stopped (step 111).

The potentiometer 20 has a normal detection range that can be detected by the position of the mover 21 (see FIG. 3), and the range is limited to the range of voltage values A to B (see FIG. 4). . The voltage value exceeds B in the abnormal range beyond the normal detection range. On the other hand, the signal line from the potentiometer 20 is broken,
When contact failure occurs, a voltage exceeding B or a voltage less than A is input to the microcomputer 51 of the main body controller 50.

In the step 103, the abnormal input from the potentiometer 20 is detected according to the subroutine of FIG. 6 whether the input voltage input from the potentiometer 20 to the microcomputer 51 of the main body controller 50 is less than A or exceeds B. Is determined in the microcomputer 51 (step (a),
(B)), if any of them is YES, it is further monitored whether or not the state continues for a predetermined time or more (step (c)).
Is stopped and an error is displayed on the display 62 of the remote controller 60 (step (d)). Steps (a), (b)
If both are NO, it is considered that the mixing valves 20, 30, 40 are operating normally (step (e)).

If an abnormality is detected in steps 103 and 104, if the mover 21 exceeds the normal detection range of the potentiometer 20 due to runaway of the drive motor 30, etc., the detection signal input line from the potentiometer 20 to the microcomputer 51 is This is the case where the wire is broken or the contact is poor. If the potentiometer is judged to be abnormal in the above subroutine, the motor
When 30 is stopped (subroutine step (d)),
The main body controller 50 memorizes the rotation direction of the motor 30 immediately before it is stopped by the microcomputer 51, and then monitors the operation switch being turned off and on and resetting (step 11
2) If turned on, the motor 30 is once rotated in a direction opposite to the stored rotation direction for a predetermined short time (step 113). Then, when this ends, the main body controller 50 proceeds to step 105 and subsequent steps to rotate the motor 30 in the valve body set position direction while comparing the present position of the valve body with the set position (steps 107 and 108). Adjust the valve body to the set position (steps 109, 110),
If the valve body falls within a certain allowable range with respect to the set position, the motor is stopped (step 111), and while adjusting the valve body position while rotating the motor 30 in the valve body setting direction. Also detects the abnormality of the potentiometer input and determines it (steps 103 and 104) .If the potentiometer input exceeds the normal detection range of the potentiometer 20 and continues for a certain period of time, the potentiometer 20 abnormality is judged again. , The motor 30 is stopped (step (d) of the subroutine) and the error display continues. However, if the motor is stopped due to disconnection or poor contact, it is a priori decision to restore it. If the normal operation is not restored even if the operation is reset, the abnormality display continues, and the degree of the abnormality can be known. In Steps (c) and (d), the motor is stopped and the error is displayed for a certain period of time, so that it is possible to continue the operation without stopping it for a slight malfunction that can be resolved spontaneously in a short time. be able to.

If the operation switch is not reset to OFF-ON in step 112, the motor 30 is maintained in the stopped state (step 114).

In the above embodiment, the motor 30 stopped by the abnormality of the potentiometer 20 is rotated in the opposite direction to the rotation direction immediately before the stop of the operation on condition that the OFF-ON reset signal of the operation switch is input. Instead of the condition that a switch off-on reset signal is input, after the motor is stopped due to the abnormality of the potentiometer 20, the drive motor 30 is automatically turned in the opposite direction to the rotation direction immediately before the stop. While performing the rotation of the, once while rotating in the direction of the valve body setting position, a series of operations for determining the presence or absence of abnormality of the potentiometer 20,
A main body controller 50 may be provided to perform the operation once or several times.

<Effect> The present invention is configured as described above, and according to the hot water supply system according to claim 1, when the motor is stopped by determining that the potentiometer is abnormal, the drive motor immediately before the stop. The rotation direction of the drive motor is stored, and the drive motor is rotated in a direction opposite to the stored rotation direction on condition that an OFF-ON reset signal of the operation switch is input. Since the main body controller that determines whether the potentiometer is abnormal while rotating in the body setting position direction is provided, even if there is an abnormality in the potentiometer, the operation switch can be turned on and off again. , The operation of releasing the abnormal state of the potentiometer, the subsequent movement of the valve body position to the set position, and the operation of releasing the error display are automatically performed. It is very convenient because it can be performed in conjunction with each other. Of course, there is less need to disassemble and repair the device,
The effect on maintenance is also great.

According to the hot water supply system according to claim 2,
In the hot water supply system according to [1], the operation switch is turned off.
Instead of the condition that an on-reset signal is input, after the motor is stopped due to an abnormality in the potentiometer, the drive motor automatically rotates once in the opposite direction to the stored rotation direction immediately before the stop. After that, the main body controller that performs a series of operations that determines whether or not the potentiometer is abnormal while rotating in the direction of the valve body setting position is provided with a limit of 1 to several times. Even if the drive motor is stopped, without special operation corresponding to it,
This is extremely convenient because the operation of releasing the abnormal state of the potentiometer, the subsequent movement of the valve body position to the set position, and the operation of releasing the abnormality display can be automatically performed in conjunction with each other. Of course, there is less need to disassemble and repair the device, and the effect on maintenance is great.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an apparatus embodying the present invention, FIG. 2 is a configuration diagram showing a relationship between a main body controller, a potentiometer, a drive motor, and an electric mixing valve, and FIG. 3 is a diagram illustrating a normal range and an abnormal range of the potentiometer. 4 and 5 are views for explaining the relationship between the voltage value indicated by the potentiometer and the normal range, FIG. 5 is a flow chart showing an example of control by the main body controller, and FIG. 6 is a flowchart for detecting potentiometer input abnormality by the main body controller. It is a row chart. 2: Hot water storage unit 20: Potentiometer 30: Drive motor 40: Electric mixing valve 50: Main unit controller 51: Microcomputer 60: Remote controller

Claims (2)

[Claims] 1. A hot water water heater for mixing hot water and water from a hot water storage unit with an electric mixing valve equipped with a potentiometer to adjust the temperature to a predetermined temperature, and detecting the valve position of the electric mixing valve. When the input value from the potentiometer continues to be a value other than the input value corresponding to the normal detection range of the potentiometer for a certain time or more, it is determined that the potentiometer is abnormal, and the drive motor of the electric mixing valve is stopped. When the potentiometer is judged to be abnormal and the motor is stopped, the rotation direction of the drive motor immediately before the stop is stored and the operation switch is turned off. -On condition that an on-reset signal is input, the rotation direction once stored with respect to the drive motor is stored. Performs rotation in the opposite direction, while the rotation of the valve body set position direction Thereafter, hot water heater, characterized in that a body controller that also determination potentiometer whether abnormal or not. 2. The rotation direction immediately before the stop stored in the drive motor automatically after the stop of the drive motor due to the abnormality of the potentiometer, instead of the condition that the off-on reset signal of the operation switch is input. The main body performs a series of operations for once to a few times while performing a rotation in the opposite direction to the above, and then performing a rotation in the direction of the valve set position while also determining whether or not the potentiometer is abnormal. The hot water supply system according to claim 1, further comprising a controller.