JP2790835B2 - Water overflow dangerous water level detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, an automatic bath apparatus in which hot water heated by a water heater is once received in a water tub and then poured into the bath tub. It relates to a method of detecting.

[Conventional technology]

A conventional pouring system of an automatic bath apparatus for once pouring hot water heated by a water heater into a water tub and then pouring the hot water into the bath tub is generally configured as shown in FIG. That is, in FIG. 4, 1 is a heat exchanger for hot water supply, 2 is a burner, 3 is an electric adjustable faucet, 4 is a flow meter, 5 is a water tank, 6 is a water level meter disposed in the water tank, 7 Is a float switch for detecting dangerous water level,
Reference numeral 8 denotes a microcomputer control unit, 9 denotes a bathtub, 10 denotes a pipe connecting the water bath 5 and the bathtub 9, and the hot water heated by the hot water supply heat exchanger 1 passes through the electric adjustable faucet 3 and the flow meter 4. Once supplied into the water tank 5, the water level in the water tank 5 is continuously monitored by the water level gauge 6, the molten metal is poured into the bathtub through the pipe 10, and the output 6 a of the water level gauge 6 and the flow meter 4 Is output to the microcomputer control unit 8, and based on these signals, the opening of the electrically adjustable water tap 3 is automatically adjusted by the water tap adjustment voltage 8a output from the microcomputer control unit, and the hot water in the water tank is adjusted. Is controlled not to overflow. However, in order to prevent the water 11 from overflowing from the water tank 5 for some reason, the output 7a of the float switch 7 is input to the microcomputer control unit 8, and when the float switch 7 outputs the dangerous water level,
The electrically adjustable water tap 3 is configured to be immediately closed.

In addition, the automatic bath apparatus shown in FIG. 4 is simplified and actually configured so that hot water in the bathtub can be recirculated and reheated by a reheating heat exchanger.
This piping 10 for circulation reheating is used for the pipe 10 leading to.

[Problems to be solved by the invention]

As described above, conventionally, the detection of the water overflow dangerous water level is performed by:
A dedicated water overflow hazardous water level detection device is required, which increases the cost, and also requires an input port of the microcomputer control unit for detecting the hazardous water level, thus complicating the process.

The present invention solves the problems of the prior art as described above, and provides a minimum required water level meter with a water overflow dangerous water level detection function, thereby reducing costs and simplifying the processing system by reducing the number of parts used. The purpose is to be able to measure.

[Means for solving the problem]

In order to achieve the above object, the present invention has an inflection point in the water level versus output characteristic of a water level meter that continuously detects and electrically outputs a water level. A water level gauge is installed in a water tank so as to coincide with the water level, so that the water level gauge has a function of detecting a dangerous water level at which water overflows.

[Action]

The water level versus output characteristic of the water gauge has a certain inclination angle. If the water level versus output characteristic of such a water level meter has two inclination angles θ ₁ and θ ₂ , an inflection point occurs at the boundary between θ ₁ and θ ₂ . If the water level gauge is installed in the water tank such that the inflection point coincides with the water overflow dangerous water level, it is possible to detect the water overflow dangerous water level by the inflection point.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a pouring system diagram showing an example in which the present invention is applied to a method for detecting overflow of water in a water tank of an automatic bath apparatus, and FIG.
(B) and (c) are cross-sectional views showing a configuration example of a water level gauge, and FIG. 3 is an explanatory diagram of an inflection point.

In FIG. 1, 1 is a heat exchanger for hot water supply, 2 is its burner, 3 is an electrically adjustable faucet, 4 is a flow meter, 5 is a water tank, and 6 is a water level meter having an inflection point 6b in water level versus output characteristics. , 8 denotes a microcomputer control unit, and 9 denotes a bathtub.

In the present invention, a water level meter having an inflection point 6b in the water level versus output characteristic is used, and the inflection point 6b of the water level meter is matched with the water overflow dangerous water level H, and the water level meter is attached to the water tank 5, and the output is measured. Is input to the microcomputer control unit 8.

More specifically, when the water level meter is of the capacitance type, the water level meter has an inflection point in the water level versus output characteristic as shown in FIG. For example, FIG. 2 (a) shows a water level gauge covered with a cylindrical insulator from the bottom to the periphery of the electrode rod 61,
The insulator 62a below the inflection point 6b has a large diameter, and the insulator 62b above the inflection point 6b has a small diameter. Fig. 2 (b)
A water level gauge covered with a cylindrical insulator from the bottom to the periphery of the electrode rod 61, and the insulator has the same outer diameter,
The material of the upper insulator 62c and the material of the lower insulator 62d are made different so that an inflection point appears at the boundary between them. Further, FIG. 2 (c) shows a water level gauge covered with an insulator 62 from the bottom to the periphery of the plate-shaped electrode plate 61 ', and the width of the upper part of the plate-shaped electrode plate 61' is made horizontally long.

In this case, since the water level meter has different electrode capacitances per water level above and below the inflection point 6b, there is a difference in the inclination angle of the water level versus the output voltage characteristic of the water level meter.

For example, as shown in FIG. 3, but to no electrode capacitance v ₀ per level to h ₃ from the water level h ₀ v ₃ is changed at a constant inclination angle theta _1, overflow water above the water level h ₃ since different from the inclination angle theta ₂ is theta ₁ water level h ₄ electrode capacitance v ₃ per level up to v _4, it is an inflection point 6b to the boundary of the theta ₁ and theta _2.

The inflection point of the output voltage characteristic of the water gauge is detected in the following procedure.

First, the water level meter output voltage v ₁ when the current water level h ₁ of the water tank 5
The may be stored in the microcomputer control unit 8, then slightly increase the water level in the water tank and h _2, to store the output voltage v ₂ of water gauge at this _{time, h 1, h 2, v} 1, v _The microcomputer controller calculates the inclination angle θ ₁ of the water level versus the output voltage from the relationship of ₂ .

The amount of rise in the water level is measured by measuring the amount of flowing water from h ₁ to h ₂ with the flow meter 4, integrating the output with a timer in the microcomputer control unit 8, and dividing the output by the area of the water tank 5. Can be realized.

The same procedure is repeated until the inclination angle of the water level versus the output voltage changes, and when the inclination angle changes from θ ₁ to θ ₂ is detected as an inflection point, and the output voltage of the water level meter at the inflection point is calculated by the microcomputer. By storing it in the control unit and comparing the output voltage of the water level meter with the stored value, it is possible to immediately detect that the water level of the water tank 5 is at the risk of water overflow.

〔The invention's effect〕

As described above, according to the present invention, there is an effect that a danger of a water overflow dangerous water level can be performed using a water level meter without using a device or a part for detecting a water overflow dangerous water level.

[Brief description of the drawings]

FIG. 1 is a diagram of a pouring system of an automatic bath apparatus to which the method of the present invention is applied, FIGS. 2 (a), (b) and (c) are cross-sectional views showing specific examples of a water level gauge, and FIG. FIG. FIG. 4 is a pouring system diagram of an automatic bath apparatus showing a conventional method. 1 ... Heat exchanger for hot water supply 3 ... Electric adjustable faucet 4 ...
Flow meter, 5 ... water tank, 6 ... water level meter, 6b ... inflection point of water level vs. output characteristic, H ... water overflow dangerous water level, 8 ... microcomputer control unit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 57-171476 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01F 23/00

Claims (1)

(57) [Claims] An inflection point is provided in a water level versus output characteristic of a water level meter that continuously detects a change in water level and electrically outputs the water level, and the inflection point coincides with a dangerous water level at which water overflows. A method for detecting a water level at which a water level is provided in a water tank, whereby the water level gauge is provided with a function for detecting a water level at which the water level overflows.