JPH0391814A - Earth leakage breaker for hot water washer - Google Patents

Abstract

PURPOSE:To simplify the constitution of the hot water washer together with reduction of the cost by opening a relay contact performing the temperature control and stopping the energization of a heater in a normal state where a leak is detected by a leak detection means. CONSTITUTION:When a heater 3 has no leak, a leak detection means 13 detects no leak and no signal is applied to a 2nd temperature control means 31b. Then a 1st temperature control means 31a performs the temperature control of the warm water. When the heater 3 has the dielectric breakdown and has a leak through the hot water, the means 13 detects the leak out of the output of a current transformer. This detection output is supplied to the means 31b. The means 31b opens the contacts 35a and 35b of a relay 35 via a heater driving part 32 to stop the drive of the heater 3. As a result, a relay circuit can be used in common for both the leak and temperature control purposes. Then the constitution is simplified together with reduction of the cost for a leak cut-off device for hot water washer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an earth leakage interrupting device for ensuring the safety of a hot water washing device for washing private parts with hot water after using the toilet.

[Conventional technology]

A conventional hot water cleaning device has a hot water tank 2 to which water is supplied from a low tank 1, as shown in FIG. 2, for example.
A heater 3 is provided in the hot water tank 2 to heat the water. Then, water heated by the heater 3 which is energized by an operation from an operation section (not shown) is ejected from the cleaning nozzle 5 toward the private parts of the human body by the water supply pump motor 4.

A temperature detection means 6 for detecting the temperature of the washing water is provided in the hot water tank 2, and its output is given to the control circuit section 7. The control circuit section 7 controls the temperature inside the hot water tank 2 to a predetermined value using the heater 3.

Now, a sheathed heater is normally used as the heater 3, but if dielectric breakdown occurs, it is dangerous because it may leak electricity into the hot water and cause an electric shock during use. Therefore, as shown in FIG. 3, an earth leakage interrupting device 10 is used together with the control circuit section 7. A current transformer 12 is attached to one side of the AC power supply 1l to detect the unbalanced state of the current, and when the leakage detection means 13 detects a leakage based on the output of the current transformer 12, a relay 15 is sent via the transistor 14. to drive relay contacts 15a. Open 15b. Then, the power supply is cut off and the power supply to the control circuit section 7 is stopped.

As shown in FIG. 3, in the control circuit section 7, a constant voltage is applied to the control circuit l7 from the power supply circuit section l6.

The control circuit 17 is supplied with signals from the temperature setting means 18 and the operating section 19, and is also supplied with the output of the temperature detection stage 6 as described above. The control circuit 17 controls the heater drive section 2 so that the temperature is set by the temperature setting means 18.
The temperature of the heater 3 is controlled by intermittent energization of the heater 3 via a transistor 21 and a relay circuit 22 connected to the output side of the heater 3.

[Problem to be solved by the invention]

However, in this conventional construction, the relay 15 that operates in the event of a current leak and the relay 22 that turns on and off the heater 3 to control the hot water temperature are provided separately. Therefore, each relay and its driving circuit are required, which poses a problem in that the cost of parts becomes extremely high.

The present invention has been made in view of such conventional problems, and an object of the present invention is to reduce the cost of parts by sharing a relay for cutting off the power in the event of an electric leak and a relay for controlling the heater current. is a technical issue.

[Means to solve the problem]

The present invention includes a heater that heats water in a hot water tank, a heater drive section that includes a relay whose contacts are connected in series between the heater and a power source, and that controls energization to the heater, and an earth leakage detection means that detects electric leakage of the heater. , a temperature setting means for setting the hot water temperature of the hot water tank, a hot water temperature detecting means for detecting the hot water temperature of the hot water tank, and a hot water temperature set by the temperature setting means based on the hot water temperature signal from the hot water temperature detecting means. a first temperature control means that controls the heater drive means so that the heater drive means is set; a second temperature control means that turns off energization of the heater by the heater drive means when a leakage of the heater is detected by the leakage detection means; It is characterized by comprising the following.

[Effect]

According to the present invention having such features, while the leakage detecting means does not detect a leakage, the power supply to the heater is controlled via the heater driving means so that the temperature is maintained at the temperature set by the first temperature control means. ing. If the heater that warms the cleaning water has dielectric breakdown and the power source leaks through the hot water, the leakage detection means detects the leakage, and the second temperature control means turns off the power to the heater.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a hot water cleaning device. The configuration or diagram of the hot water cleaning device itself is the same as the conventional example shown in FIG. 2, so its explanation will be omitted. In FIG. 1, a current transformer l2 is attached to the AC power supply 11, and the unbalanced current thereof is detected by the leakage detection means 13, as in the conventional example described above.

Also in this embodiment, both ends of the AC power supply 11 are connected to the power supply circuit section 1.
6, the rectified and stabilized voltage is applied to the control unit 31
given to. The control section 3l is supplied with signals from the temperature detection stage 6, the temperature setting means 18, and the operation section 19 as in the conventional example described above. The control unit 31 is connected to a microcomputer, a memory for storing processing procedures, and a human output interface, and controls the temperature of the hot water in the hot water tank 2 to be constant based on the outputs of the temperature setting means 18 and the temperature detection means 6. 1,000 temperature control stages 31a, and a second temperature control means 3lb that operates when an electric leakage is detected.

Now, the output of the control section 3l is given to the heater drive section 32 and the bomb motor drive section 33. The heater drive section 32 drives a relay 35 connected in series to the collector via a transistor 34 in accordance with an input signal. relay 3
A pair of contacts 35a and 35b of 5 are connected to both ends of a heater 3 that heats the hot water in the hot water tank 2, and are configured to energize the heater 3 from the AC power source 11 when the relay 35 is driven.

Next, the operation of this embodiment will be explained. Normally, when there is no current leakage in the heater 3, no current leakage is detected by the current leakage detection means 13, and no signal is transmitted to the second temperature control means 3lb. Therefore, the temperature control of the hot water is controlled by the first temperature control stage 31a. That is, the water temperature is maintained at a predetermined value by performing feedback control based on the output of the temperature detection stage 6 so that the temperature is set by the temperature setting means 18. Now, when the heater 3 suffers dielectric breakdown and the AC power supply leaks through hot water, the leakage is detected by the leakage detection stage 13 based on the output of the current transformer 12, and the output is given to the second temperature control means 3lb. Therefore, the second temperature control means 3lb is controlled via the heater drive unit 32 through the contacts 35a of the relay 35. 35b is opened to stop driving the heater 3. In this way, even if the water temperature is lower than the set temperature, the heater 3 will not be energized, thereby preventing electric shock to the human body.

〔Effect of the invention〕

As described above, according to the present invention, when a current leakage is detected by the current leakage detection means, the relay contact that controls the temperature is always kept open, thereby stopping the power supply to the heater. Therefore, the relay circuit can be used both for current leakage and temperature control. Therefore, by simplifying the configuration, the number of parts can be reduced. Furthermore, since the assembly work is easy, the cost can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an earth leakage interrupting device used in a hot water cleaning device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the hot water cleaning device, and FIG. FIG. 2 is a block diagram of an earth leakage interrupting device. 2---1-11 Hot water tank 3--- Heater degree detection means 1 3--- Earth leakage detection means First temperature control means 3lb degree control means 32-- Heater drive section Relay 6 ---- One temperature 31a Second temperature 35

Claims (1)

[Claims] (1) A heater that heats water in a hot water tank; a heater drive unit that includes a relay whose contacts are connected in series between the heater and a power source to control energization of the heater; and an earth leakage that detects electric leakage of the heater. a detection means; a temperature setting means for setting a hot water temperature in the hot water tank; a hot water temperature detecting means for detecting a hot water temperature in the hot water tank; and a temperature setting means based on a hot water temperature signal from the hot water temperature detecting means. a first temperature control means for controlling the heater drive means so that the hot water temperature is set by the temperature control means; and a first temperature control means for controlling the heater drive means so that the hot water temperature reaches a temperature set by the heater drive means; An earth leakage interrupting device for a hot water cleaning device, comprising: a second temperature control means that turns off.