JPH0674556A - Control device for relay for heater control of bath water purification device - Google Patents

Abstract

(57) [Summary] [Structure] In a bath water purifying apparatus, a hot water temperature setting device 1 for storing a set hot water temperature value in a storage device 2, and a hot water temperature detector 3 for detecting a hot water temperature value of hot water. , A comparator 4 for comparing the hot water temperature value with a preset hot water temperature value, a timer 5 for constantly counting up the output of the comparator connected to a reset terminal, and a judgment for inputting the comparator and the output of the timer It is provided with a container 6 and a relay 8 for controlling ON / OFF of the power source of the heater 7, and once the relay is turned off, the hot water temperature value drops from the set hot water temperature value by a constant value, and the relay A control device for a relay for heater control of a bath water purification device, which is turned on when a timer 5 reset when it is off exceeds a set value. [Effects] According to the present invention, after the relay is turned off, the relay is not turned on until the timer value reaches a preset value together with the condition of the hot water temperature, so that the relay contact is prevented from oscillating. It is possible to solve the problem of welding the relay contacts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay control device for controlling ON / OFF of a power source of a heater for keeping warm bath water of a bath water purifying device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a bath water purifying apparatus 20 including a control unit 16 and a purifying unit 17 has been proposed. Although not shown, the control unit 16 includes the bath water purification device 2
Input section for setting 0 operating conditions, setting conditions,
The purification unit 1 includes a display unit that displays various types of information such as operating conditions.
The controller 7 receives the outputs of various sensors such as the hot water temperature detecting means from 7 and controls them as a whole.

Purification unit 17 controlled by control unit 16
The circulation pump 13 causes the bath water in the bathtub 10 to flow from the suction side 11 of the circulation path for the circulation pump 13 to the filtration device 1.
2, circulation pump 13, warming heater 14 and sterilizer 1
Circulate through the discharge side 11 'of the circulation path through 5 etc.,
It keeps the bath water warm and removes dirt from the bath water for purification.

[0004]

In the conventional example, the temperature control of the bath water purifying apparatus is performed by the ON-OFF control of the heat retaining heater. The ON / OFF control of the relay is used to control the ON / OFF of the heater power.
Since the heater current is relatively large, there is a problem that the relay contacts are likely to be welded.

That is, for the ON-OFF control of this relay, the set hot water temperature value and the actual hot water temperature value detected by the hot water temperature detector are compared using a comparator, and the detected hot water temperature value is After the set hot water temperature value is reached and the relay is turned off, when the set hot water temperature value falls below the preset hot water temperature value by a predetermined value, the relay is turned on again.
The comparator is provided with a hysteresis corresponding to this temperature difference so as to be N.

However, in this case, when the signal from the hot water temperature detector is interrupted due to vibration of the circulating pump due to poor contact of the connector of the hot water temperature detector or the like, the relay contacts are turned on and off in a short cycle. It becomes the oscillation state that repeats
There was a problem that the contacts were welded.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the conventional example, the present invention relates to a bath water purifying apparatus, in which a hot water temperature set by a user is stored in a storage device as a set hot water temperature value. A temperature setting device, a hot water temperature detector for detecting the hot water temperature value of the bath water, a comparator for comparing the hot water temperature value with the hot water temperature value stored in the set value storage device, and the output of the comparator. A timer connected to a reset terminal and constantly counting up, a comparator for inputting the output of the comparator and the timer, and a relay for ON / OFF controlling the power supply of the heater are provided.
After the hot water temperature value exceeds the set hot water temperature value and is once turned off by the signal from the comparator, the timer reset when the relay is turned off exceeds the set value, and the hot water temperature value is Provided is a controller for a heater control relay of a bath water purifying device, which is turned on by a signal from the determination device when the set hot water temperature value drops by a constant value.

[0008]

According to the present invention, after the actual hot water temperature value reaches the set hot water temperature value and the relay is once turned off, the actual hot water temperature is not reflected due to poor contact of the connector of the hot water temperature detector. Even if the signal is output intermittently, the relay is not turned on until the timer value reaches the set value, so it is possible to prevent the relay contact from oscillating in such a way that it repeatedly turns on and off at short intervals. This has the effect of solving the problem of welding the relay contacts and greatly extending the product life as well as the safety of the entire device.

[0009]

【Example】

(1) Configuration of Bath Water Purification Device First, the configuration of the bath water purification device of the present invention will be described with reference to FIG.

In FIG. 1, a hot water temperature setting device 1 is a device for a user to set a desired hot water temperature. Storage device 2 stores the hot water temperature value set by hot water temperature setting device 1 as a set hot water temperature value. The hot water temperature detector 3 is a device that detects the hot water temperature of the bath water.

The comparator 4 compares the set hot water temperature value stored in the storage device 2 with the hot water temperature value detected by the hot water temperature detector 3,
An ON or OFF signal is output according to the comparison result. The timer 5 is reset by receiving the OFF signal from the comparator 4 and constantly counts up.

The judging device 6 receives the ON signal of the comparator 4 and the signal when the timer 5 exceeds the set value, and outputs the ON signal to the relay 8. The relay 8 receives the ON signal of the judging device 6 and turns ON, and receives the OFF signal of the comparator 4 and turns OFF, and controls the power supply of the heater 7 for keeping the bath water in the bath warm.

As shown in FIG. 4, the set hot water temperature value indicates a value T at which the hot water temperature rises and the comparator 4 outputs an OFF signal. A temperature T-t lower by a preset constant value t is also set accordingly. The value of this temperature T-t is once when the comparator 4 is turned off.
This is the hot water temperature value at which the comparator 4 outputs the ON signal again as the hot water temperature decreases with the passage of time after the signal is output.

(2) Description of Operation Next, the control operation of the bath water purifying apparatus will be described with reference to FIG. In the figure, Sn (n = 1, 2, 3,
() Indicates each processing step of control.

S1, S2 When changing the set hot water temperature value, the user changes and sets the hot water temperature setting value in the hot water temperature setting device 1 in S2. The set value is stored in the storage device 2 as a set hot water temperature value. When the setting of the hot water temperature value is not changed, the process proceeds to S3. The set hot water temperature value in this case is a value that has already been set or a default value that is preset by the device and is stored in the storage device 2.

S3, S4 The hot water temperature detector 3 detects the hot water temperature value of the bath water and compares it with the set hot water temperature value. If the hot water temperature value is set, the hot water temperature detection is continued. move on.

S5 When the detected hot water temperature value is lower than the set hot water temperature value, the comparator 4 outputs an ON signal to the judging device 6 and proceeds to S6. When it is high, the comparator 4 sends an OFF signal. Output and proceed to S9.

In the determination of S5, the set hot water temperature value when proceeding to S6 is the value of T in FIG. 4 when the hot water temperature is rising, and when the hot water temperature value is falling from T. It becomes the value of T-t. Further, when proceeding to S9, the set hot water temperature value becomes the value of T.

When the S6 decision unit 6 receives the ON signal from the comparator 4, it decides whether the count value of the timer 5 is a predetermined value or more.
In the present embodiment, the predetermined count value is 1 minute when converted into time. The timer 5 outputs an ON signal to the determiner 6 when it is equal to or larger than a predetermined value, and otherwise stands by until it reaches a predetermined value.

S7, S8 In S7, the decision unit 6 determines that the ON signal of the comparator 4 and the timer O
In response to the N signal, the relay 8 is turned on, whereby the heater 7 is turned on in S8 and the bath water temperature value rises.

S9-S11 When the hot water temperature is higher than the set hot water temperature value, the comparator 4 outputs an OFF signal, whereby the relay 8 is turned off in S9, the heater 7 is turned off in S10, and at the same time, S11. Then, the timer 5 is reset. When the timer 5 is reset, the timer value is cleared and the count-up of the timer 5 is restarted, as shown in FIG.

As described above, ON / OFF control of the relay 8 is performed by a combination of the hot water temperature value and the timer 5, and if the timer 5 does not turn OFF once and the timer 5 does not elapse a preset time, Even if the hot water temperature value falls below the set hot water temperature value, the relay 8 does not turn on again.

Therefore, for example, the connector or the like of the hot water temperature detector 4 has a poor contact, and the vibration from the circulation pump causes
The signal from the hot water temperature detector is intermittent, the comparator 4 is ON, OF
Even if the F signal is output in a short cycle, the relay 8 is ON-OFF controlled without being affected by it, so that the conventional problem of welding the relay contact is greatly improved, and the safety and life of the product are improved. Can be extended.

[0024]

According to the present invention, after the actual hot water temperature value reaches the set hot water temperature value and the relay is turned off once, the actual hot water temperature is reflected by the contact failure of the connector of the hot water temperature detector. Even if a signal is output intermittently, the relay does not turn on until the timer value reaches the set value, so the relay contact will be in an oscillating state that repeats ON-OFF with a short cycle as in the past. Can be prevented, the problem of welding the relay contacts can be solved, and the safety of the entire device and the product life can be significantly extended.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention.

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 is a flowchart showing the operation of the timer.

FIG. 4 is a diagram showing a relationship between a set hot water temperature value and an output to a comparator.

FIG. 5 is a view showing a conventional example of a bath water purifier.

[Explanation of symbols]

 1 Hot water temperature setting device 2 Storage device 3 Hot water temperature detector 4 Comparator 5 Timer 6 Judgment device 7 Heater 8 Relay 9 Power supply

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // A47K 3/00 Z 7150-2D

Claims (1)

[Claims] 1. A bath water purifying apparatus which circulates and purifies bath water in a bathtub by a circulation pump through a circulation path including a filtration device, a heat-retaining heater and the like, and sets a hot water temperature value set by a user. A hot water temperature setting device for storing the hot water temperature value in the storage device, a hot water temperature detector for detecting the hot water temperature value of the bath water, a comparator for comparing the hot water temperature value with the preset hot water temperature value, and a comparator of the comparator. The output is connected to a reset terminal, and a timer that constantly counts up, a determiner that receives the outputs of the comparator and the timer, and a relay that controls ON / OFF of the power source of the heater are provided, and the relay is the After the hot water temperature value exceeded the set hot water temperature value and was once turned off by the signal from the comparator 4, the hot water temperature value dropped from the set hot water temperature value by a certain value and was reset at the same time when the relay was turned off. The above judgment is made when the timer exceeds the set value. To become ON by a signal from the control unit of the heater control relay bath water purifying apparatus according to claim.