JPH02219953A - Water level sensor device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic bath water level detection device that supplies a set amount of water or hot water to a bathtub and circulates it to maintain the water level at a set temperature.

BACKGROUND OF THE INVENTION A system diagram of a conventional water level detection device of this type is shown in FIG. 1 is a bathtub which is a water storage part, 2 is an adapter provided on the side of the bathtub, 3 is a water heater, and the adapter 2 and the water heater 3 are connected by an outgoing pipe 4 and a return pipe 5. There is. 5
0 is the external piping of the return pipe 5. 51 is a drain plug.

Connected to the outgoing pipe 4 are a pump 6 for circulating water in the water storage section 1 and for supplying water into the water storage section 1, and a heating means 7 for raising the temperature of the circulating water. Also connected to the return pipe 5 are a pressure sensor 8 for detecting the water level in the water storage tank 1 and a temperature sensor 9 for detecting the temperature of the circulating water.

Further, a water supply source 10 is connected to a switching means 12 provided in the return pipe 5 via a water supply pipe 11.

The switching means 12 switches the connection of the outgoing pipe 4 to the return pipe 5 or the water supply pipe 11. Further, 13 is a control means, which will be explained using FIG. 3 of the present invention (the conventional example is one without a means for determining the degree of pressure rise that receives a signal from the pressure sensor 8), and a pressure sensor 8 and a temperature sensor 9. The input signal is used to judge each set value, and the memory is used in cooperation with the processor to control the pump 6° heating means 7. Water source 10.
It controls the switching means 12.

In the above configuration, the water level in the water storage part 1 is detected by the pressure sensor 8 on the water heater 3 side, and water is supplied to the set water level, and the pressures detected by the pressure sensor 8 are P and +P in FIG. . Of these, the water level above adapter 2 is determined by the dimensions of the human body, and since the difference is small, it does not change much even if the bathtub is different. Therefore, the pressure PA also does not change much, but adapter 2 and pressure sensor The pressure P8 between water storage parts 1 and water heater 3 varies greatly depending on the relative installation conditions of the water storage part 1 and the water heater 3, and therefore cannot be uniformly determined and requires individual adjustment at the installation site, which is inconvenient.

Moreover, even if one item is adjusted as described above, it will change due to aging of the pressure sensor and controller. In step S2, switching means 1
2 to the water supply pipe 11, start supplying water from the water supply source lO in step S3, start the pump 6 in step S4, start supplying water to the water storage part 1, wait until water enters and leaves the water storage part l, and then connect the adapter to the water supply pipe 11. There is no change in pressure until the water level reaches 2, and the pressure increases from when the water level crosses adapter 2, so the pressure inflection point is detected in step S5, and the pressure value is memorized in step S6, By setting the standard value, it becomes possible to supply water to a constant water level regardless of installation conditions. A flowchart of the control by the control means 13 and its water supply operation using this principle is shown in FIG. . Elapsed time. When the water level crosses the adapter 2, the pressure inflection point shown in step S5 is detected.In step S6, the subsequent pressure value is stored as a reference value, and from there, the set value water supply is performed in step S7 until P is increased. conduct. When the set value is reached at the elapsed time t^, the water supply is stopped as shown in step 38 to SlO.

Problems to be Solved by the Invention However, in the above sequence, if the set water level is set above the top surface of the water storage part 1 or if the drain valve 51 is opened after the inflection point is detected in step 5, the water supply will be limited. It had the disadvantage that it continued without interruption.

The present invention solves such conventional problems and aims to detect water overflow from a water storage section and water leakage errors.

Means for Solving the Problems In order to solve the above problems, the detection device of the present invention has a control means incorporating a sequence of checking for the presence or absence of a water level rise signal from a pressure sensor when water is supplied up to a set value. It is.

According to the above-described structure, the present invention checks the water level rise signal from the pressure sensor when checking the set water level, and if there is no water level rise signal, it is assumed that there is an overflow and draining is an error, and the operation is stopped.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1, 2, and 3. The system diagram of the water level detection device is the same as in Figure 2, and this will be used in the explanation.
Steps that are the same as those in the figures are given the same reference numerals in FIG. That is, the difference between the present invention and the conventional one is that the control means 13 performs the step S in the set value water supply in step S7.
This is due to the addition of the judgments ll and 512. Step S7
Each time water is supplied to the set value, the rate of rise in the water level is calculated, and the water level is continued to be supplied at the set value while measuring the time required to reach the predetermined level of rise. However, if the time exceeds the predetermined time, The sequence is such that one rotation is stopped.

Also, according to Figure 6, the pressure was originally P as shown in Figure 5.
When the water reaches X+PA, the set value water supply is completed, but the elapsed time is 1. If the water storage part l is flailed, the pressure no longer rises and there is no pressure rise even after a certain period of time, so the pressure sensor 8 detects an error at the point of the certain period of time t8, and this signal is sent to the control means 13. is determined and the water supply source 10 and pump 6 operation is stopped.

This makes it possible to prevent endless water supply caused by overflow from the water storage section 1 and water leakage during the set value water supply.

Further, in the present invention, the water level reference value may be set not immediately after the measurement of the inflection point, but after a certain period of time has elapsed. However, in this case, the water level P is set to be raised by this amount.

Effects of the Invention As described above, the water level detection device of the present invention is designed to stop the water supply operation if the water level does not rise above a predetermined value within a certain period of time while supplying water to the water storage section at a set value. Even if there is overflow or water leakage from the water storage part during water supply, it is possible to solve the problem of endless water supply.

[Brief explanation of the drawing]

Figure 1 shows a water level detection device in one embodiment of the present invention! 2 is a system diagram of the water level detection device to which the present invention is applied, FIG. 3 is a block diagram of the control means in the same device, and FIG. 4 is the water supply mode operation of the conventional control means. FIG. 5 is a pressure characteristic diagram, and FIG. 6 is a pressure characteristic diagram explaining the control sequence of water level detection of the present invention.・Outbound pipe, 5
...Return pipe, 6...Pump, 8...
. . . Pressure detection means, 10 . . . Water supply source, 12.
...Switching means, 13...Control means. Name of agent: Patent attorney Shigetaka Awano -m- -m- -m- 8~-~ 10--・+2-m- Water storage part 1 main Sa beak 1 beak 37k", Eλ 1 near] :l 1 control Figure 2 4-m Ritsu 10 Figure 2 o tA Time t-Yu

Claims (1)

[Claims] a water storage section, an outflow pipe and a return pipe connected to the side of the water storage section, a pump connected to the outflow pipe, and a pressure detection means connected to the return pipe to detect the water level of the water storage section as a pressure signal. a water supply source, a water supply pipe connected to the water supply source, a switching means for connecting the outgoing pipe to the return pipe or the water supply pipe to switch between circulation mode or water supply mode, and pressure from the pressure detection means. Take the value as input,
The pump, the water supply source, and the switching means are energized to perform water supply mode operation, and the pressure value after detecting the pressure inflection point in the water supply mode operation is stored as a water level reference value, and the water level in the water storage section is adjusted. A water level detecting device comprising: a control means for determining the pressure value, and then stopping the operation in the water supply mode when the pressure value from the pressure detecting means stops changing in an upward direction.