JPH0765755B2 - 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 and 3. In a hot water supply system that mixes hot water with an electric mixing valve 40 equipped with a potentiometer 20, generally, the output of a drive motor 30 moves a movable valve element such as a wax thermo mixing valve via a gear unit (not shown). The required torque of this valve disc differs between the low temperature region and the high temperature region, and depending on the structure of the valve disc, the torque becomes high, and if the valve disc position is moved only when the hot water temperature setting is changed, the drive frequency is Since the same set position is often present for a short time, the valve body is easily locked. Further, even if foreign matter is damaged in the valve body, the locked state occurs.
In addition, the detection range of the potentiometer 20 is often provided only in a part of the movable range of the motor 30, and if the movable contact piece 21 of the potentiometer 20 is out of the normal detection range (see FIG. 3) and overruns, The motor becomes uncontrollable, and the motor 30 runs out of control until the valve body or the like reaches the mechanical lock portion 41 provided in the gear unit or the valve body portion.

Conventionally, if the detection of the locked state of the valve body continues for a certain period of time or more, the drive motor is stopped as an abnormality.

<Problems to be Solved by the Invention> However, in the above-described conventional technology, the motor being driven is only stopped at the time when it is determined to be in the lock abnormal state, and the recovery from the lock abnormal state to the normal operating state is carried out each time. I had to disassemble the valve body and the valve. However, such disassembling is difficult for an amateur, and the abnormal lock state is relatively mild.
In some cases, it can be easily released.

Therefore, it is an object of the present invention to provide a hot water supply system that can be easily restored even if an abnormal lock state occurs, without disassembling or the like.

<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. When the position of the valve element of the electric mixing valve detected by the potentiometer continues beyond a certain allowable range with respect to the set position for a certain time or more, the valve element locks. It is judged that it is in a state,
When the drive motor for the valve body is stopped and the lock abnormality is displayed, when it is determined that the valve body is in the locked state and the motor is stopped, the drive motor of the drive motor immediately before the stop is stopped. The rotation direction is stored, and the drive motor is rotated in the opposite direction to the stored rotation direction on condition that an OFF-ON reset signal of the operation switch is input, and then the valve body is rotated. The first feature is that a main body controller that also makes a lock determination is provided while rotating in the set position direction.

Further, in the hot water heater according to the first aspect of the present invention, the drive motor is automatically driven after the drive motor is stopped due to the lock abnormality, instead of the condition that the OFF-ON reset signal of the operation switch is input. For the time being, the rotation in the direction opposite to the rotation direction immediately before the stop that was memorized is once performed, and
A second feature of the present invention is that a main body controller is provided for performing a series of operations for making a lock determination once or several times while rotating the valve body in the direction of the valve set position.

<Operation> According to the first feature of the present invention, even if the drive motor is stopped due to a lock abnormality, when the operation switch is once turned off and then turned on again, the drive motor is the main controller. First, the rotation is automatically performed in the direction opposite to the stored rotation direction immediately before the stop, and thereafter, the rotation is further performed in the valve body setting position direction. As a result, when the cause of locking is light, the locked state of the valve body is actually eliminated, and the drive motor is then rotated in the direction of the valve body setting position, so that the valve body position is also the valve body setting position. It is adjusted in the direction, and when it is within a certain allowable range, it is determined to be normal by the lock determination, and the lock abnormality display is also erased. Of course, if the locked state is not canceled even by the control operation of the main body controller, the valve body portion and the like need to be disassembled and repaired.

As described above, according to the first feature, when the operation switch is turned on again from the off state, the unlocking operation of the lock state and the subsequent moving operation of the valve body position to the set position and the abnormality display are automatically performed. Since the release operation is performed, it is possible to automatically eliminate the lock abnormality, adjust the valve body to the set position, and release the lock abnormality display by performing a very simple operation, which is very convenient.

Further, according to the second aspect of the present invention, even if the drive motor is stopped due to the lock abnormality, after the stop, the main body controller automatically makes the direction reverse to the rotation direction immediately before the stop stored. It is rotated, and thereafter, it is further rotated in the direction of the valve body setting position, and a lock determination is made. By performing this series of automatic operations one or more times under the control of the main body controller, the locked state of the valve body is actually canceled when the cause of the lock is light,
Moreover, by subsequently rotating the motor in the direction of the valve body setting position, the position of the valve body is also adjusted in the direction of the valve body setting position, and when it is within a certain allowable range, it is determined to be normal by the lock determination. , The lock error display is also erased.

As described above, according to the second feature, when the drive motor is stopped due to the lock abnormality, the lock state is automatically released and the valve body position is subsequently moved to the set position, and the abnormality is generated. Since the display is released, you can automatically eliminate the lock error, adjust the valve disc to the set position, and release the lock error display with a very simple operation, which is very convenient. .

<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 time chart showing an operation example, FIG. 5 is a flow chart showing an example of control by the main body controller, and FIG. 6 is a flow chart showing processing for lock abnormality detection by the main body controller.

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, the adjustment of the hot water supply hot water temperature by the electric mixing valve 40 is performed by using the main controller 50 with the value set by the hot water supply temperature adjustment setting unit 61 of the remote controller (hereinafter referred to as Mimocon) and the value input from the potentiometer 20. 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, time T ₁ ), the burner 1 combustion control using the thermistor 8 is started so that the hot water temperature of the hot water storage portion 3 becomes a predetermined temperature ( Step 102). If no abnormality is found through the lock detection subroutine (step 103) and the lock abnormality determination (step 104), the remote controller 6
It is checked whether the hot water supply temperature control setting is changed by 0 (step 105), and if there is a change, the setting is changed in the microcomputer (step 106). Then, the temperature control signal voltage set by the hot water supply temperature control setting section 61 of the remote controller 60 (which is also the set voltage of the valve disc position) and the signal voltage indicating the valve disc position from the potentiometer 20 are set in the man computer 51. Compare and control the movement of the drive motor 30 by the difference (steps 107, 1).
08). That is, when the difference exceeds a certain allowable range (-α to + α) in the positive direction, the motor 30 is normally rotated (step 10
9) If it exceeds the negative direction, the motor 30 is rotated in the reverse direction (step 110), and when the difference is within the allowable range, the motor 30 is stopped (step 111). Is changed hot water supply temperature control in time T _2, in the embodiment, since the difference between the voltage of the set voltage and the potentiometer has exceeded the allowable range in the positive direction, the motor 30 is rotated in the forward direction, the allowable range reached the time T ₃ Since it entered inside, the motor 30 was stopped.

In the embodiment, it is assumed that the valve body is locked at time T ₄ . This lock occurs at the mechanical lock position within the normal range or abnormal range of the potentiometer, but the occurrence is detected at the time T ₅ when the hot water temperature control is changed next time.
Is. That is, the potential difference exceeds the allowable range (-α to + α) in the negative direction due to the change at time T ₅ (step 10
5, 106, 107, 108), the motor 30 has started reverse rotation. This situation is caught by the lock detection subroutine of step 103. That is, in the subroutine of FIG. 6, it is judged whether or not the potential difference exceeds the allowable range (-α to α) (step (a)), and if it is within the allowable range, the process returns to the main routine as normal (step (b)). If it exceeds the allowable range, it is determined whether or not it will continue for a certain period of time (step (c)). If it continues for a certain period of time, the motor 30 is stopped and a lock abnormality is displayed on the display section 62 of the remote controller 60 ( Step (d)). In the case of the embodiment, since the lock is still generated, the process proceeds to steps (a), (c) and (d), and the motor 30 is stopped and the lock abnormality is displayed at the time T ₆ when the time is up.

When the motor 30 is stopped due to the lock abnormality determined by the subroutine (step (d) of the subroutine), the main body controller 50 stores the rotation direction of the motor 30 immediately before the motor 30 is stopped by the microcomputer 51, and then the operation switch. Off-on and watch for reset (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, the lock determination is performed (step 104), and if the position of the valve body of the mixing valve 40 exceeds a certain allowable range with respect to the set position and continues for a certain period of time, the lock abnormality is again determined and the motor Stop 30 (step (d) of the subroutine) and continue the lock error display. If the operation is not reset in step 112, the motor 30 is maintained in the stopped state (step 114). Off the operation switch at time T ₇ in the embodiment,
Because you turn on the operation switch on time T _8, the motor 30 is the last in the opposite direction, that is once rotated in the forward direction (step
113), after a short time, through steps 105, 107, 108, time
At T ₉ , the motor 30 is reversed again (step 110), and at time T ₁₀
Enter the specified allowable range (-α to + α) with the motor 30
Has been stopped. In the embodiment it will be locked in the reverse direction rotation from the time T ₉ is eliminated.

In the above embodiment, the motor 30 stopped due to the lock abnormality is rotated in the direction opposite to the rotation direction immediately before the operation is stopped on the condition that the operation is turned off-on. Instead of the condition that the OFF-ON reset signal is input, after the motor 30 is stopped due to the lock abnormality, the drive motor 30 is automatically rotated in the direction opposite to the rotation direction immediately before the stop stored. A main body controller 50 may be provided that performs a series of operations for performing lock determination once and then, while rotating in the direction of the valve body setting position, 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 valve body is in the locked state, immediately before the stop. On the condition that the rotation direction of the drive motor is stored and an OFF-ON reset signal of the operation switch is input, the drive motor is rotated in the opposite direction to the once stored rotation direction, and Since the main body controller that also performs the lock judgment while rotating in the valve set position direction later is provided, even if the main body is locked, the lock state can be changed by a very simple operation of turning the operation switch from off to on again. This is very convenient because it is possible to automatically and interlock with the release operation, the subsequent movement of the valve body position to the set position, and the release operation of the abnormality display. Of course, there is less need to disassemble and repair the device, and the effect on maintenance is 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 a lock abnormality, the drive motor is automatically rotated once in the opposite direction to the stored rotation direction immediately before the stop. Then, while rotating in the valve body setting position direction, a series of operations that also perform lock determination,
Since the main body controller that performs the operation once or several times is provided, even if the drive motor is stopped due to a lock abnormality, the unlocking operation of the lock state can be performed without any special operation. The subsequent movement of the valve body position to the set position and the operation of canceling the abnormality display can be automatically performed in conjunction with each other, which is very convenient. 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 time charts showing an operation example, FIG. 5 is a flow chart showing an example of control by the main body controller, and FIG. 6 is a flow chart showing processing for lock abnormality detection by the main body controller. 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 hot water supply apparatus for mixing hot water and water from a hot water hot water storage section with an electric mixing valve with a potentiometer to adjust the temperature to a predetermined temperature and supplying the hot water, wherein the valve of the electric mixing valve is detected by the potentiometer. When the body position continues beyond the certain allowable range with respect to the set position for a certain period of time or more, it is determined that the valve body is in the locked state, the drive motor of the valve body is stopped, and the lock abnormality occurs. In the display, when the motor is stopped by determining that the valve body is in the locked state, 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 drive motor is once rotated in a direction opposite to the stored rotation direction, and thereafter, the valve body is rotated. While rotation in the position direction, hot water heater, characterized in that a body controller that also lock determination. 2. A rotation direction immediately before the stop, which is stored in the drive motor, is automatically set after the stop of the drive motor due to the lock abnormality, instead of the condition that the off-on reset signal of the operation switch is input. Is equipped with a main body controller that performs a series of operations for performing lock determination while rotating once in the opposite direction and then rotating in the direction of the valve disc setting position. The hot water supply apparatus according to claim 1.