JPH04359753A - Electrical hot water heater - Google Patents

Abstract

PURPOSE:To provide an electrical hot water heater capable of preventing adhering of impurities to a water sensing means and sensing water accurately. CONSTITUTION:An electrical hot water heater is comprised of a hot water storing tank 1, a water feeding pipe 2, a hot water feeding pipe 5 and a heating heater 6. A water sensing means 9 for sensing a water level is disposed below the water feeding pipe 2. A water guiding pipe 17 for dropping water from the water feeding pipe 2 toward the water sensing means 9 is disposed or the water guiding plate 7 is of a low thermal transmitting structure so as to prevent any impurities 15 from being crystallized near the water sensing means 9. Accordingly, the impurities 15 are hardly adhered to an insulation part 9b of the water sensing means 9 and even if the impurities 15 are adhered, they may be dropped with a force of water. In addition, only the water in the hot water storing part 1a can be boiled up, adhering of the water to the water sensing means 9 can be prevented and a sensing of water can be accurately performed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to an electric water heater.
More specifically, it relates to the mounting position of the water detection means and the structure of its surroundings.

0002

[Prior Art] Fig. 4 is an explanatory diagram of the configuration of a conventional electric water heater.
FIG. 5 is an enlarged view of the main part of FIG. 4. In the figure, 1 is a hot water tank, 2 is a water supply pipe that supplies water into the hot water tank 1, 3 is a ball tap that is attached to the water supply pipe 2 and keeps the water level in the hot water tank 1 constant, 4 is an overflow pipe, and the ball tap 3 To prevent overflow of hot water in a hot water storage tank 1 by discharging excess hot water when the water level cannot be kept constant due to an abnormality or the like. 5 is a hot water pipe that supplies hot water in the hot water tank 1; 6 is an electric heater that is installed at the bottom of the hot water tank 1 and heats the water in the hot water tank 1; 7a is an electric heater that supplies water from the water supply pipe 2; 8 is a temperature sensor such as a thermistor whose resistance value changes depending on the temperature, which outputs a signal in response to the temperature of the hot water in the hot water storage tank 1; 9a is arranged above the temperature sensor 8; The water detection electrode is provided to detect water and is composed of an insulating part 9b, an electrode rod 9c, and the like.

Reference numeral 10 indicates an input circuit that receives a signal from the temperature sensor 8 and a signal from the water detection electrode 9a; 11 an output circuit that controls the electric heater 6; and 12, an output circuit that controls the electric heater 6 based on the signal from the temperature sensor 8. 13 is an operation control mechanism that controls the operation of the output circuit 11 based on a signal from the water detection electrode 9a;
4 is a microcomputer (hereinafter abbreviated as microcomputer) that incorporates the temperature control mechanism 12, operation control mechanism 13, etc.
It is. 15 is an impurity, and 16 is water contained in the impurity 15.

In such an electric water heater, water is supplied into a hot water tank 1 through a water supply pipe 2, and when the water level in the hot water tank 1 rises and the ball tap 3 reaches a predetermined position, the action of the ball tap 3 causes water to rise. The water supply is stopped and the water detection electrode 9a
A weak current flows between the hot water tank 1 and the hot water tank 1. This current causes the water detection electrode 9a to send a signal to the input circuit 10, and at the same time the signal is input from the input circuit 10 to the operation control mechanism 13, the signal from the temperature sensor 8 is input to the temperature control mechanism 12, and the temperature The control mechanism 12 starts controlling the temperature of the water in the hot water tank 1, and the electric heater 6 boils the water to an appropriate temperature. When the hot water is boiled, the electric heater 6 is de-energized to become ready for hot water supply, and the hot water is supplied from the hot water pipe 5 for use.

[0005]

[Problems to be Solved by the Invention] Conventional electric water heaters as described above have the problem of eliminating impurities in the water by boiling the water.
is precipitated and attached to the insulating portion 9b. Further, even if the water in the hot water storage tank 1 is replaced or the like and the water is discharged, impurities 15 containing moisture 16 will adhere to the insulating portion 9b and harden. The moisture 16 remaining on the surface of the insulating part 9b causes a weak current to flow between the hot water storage tank 1 and the electrode rod 9c, creating a conductive state, and the water detection electrode 9a is activated, causing the microcomputer 14 to detect the hot water storage tank. It may be determined that there is water inside the tank, causing electric heaters to malfunction.

The present invention was made to solve the above-mentioned problems, and its object is to provide an electric water heater that can accurately detect water while preventing the adhesion of impurities.

[0007]

[Means for Solving the Problems] An electric water heater according to the present invention includes a hot water tank that is divided into a hot water storage section and a water supply section by a water guide plate with an open bottom, and a water supply section that is connected above the hot water storage tank. It has a water supply pipe that opens to the water supply pipe, a hot water supply pipe connected to the hot water storage part of the hot water storage tank, and a heating heater provided in the hot water storage part,
A water detection means for detecting the water level is provided below the water supply pipe, and a water guide pipe is provided to allow water to fall from the water supply pipe to the water detection means, or a water detection means for detecting the water level is provided below the water supply pipe. In addition, the water guide plate has a structure with low heat conduction. In addition, a water detection means for detecting the water level is provided below the water supply pipe, a water guide pipe is provided for dropping water from the water supply pipe to the water detection means, and the water guide plate has a structure with low heat conduction.

[0008]

[Operation] Water passes from the water supply pipe through the water conduit pipe, hits the water detection means, is supplied to the water supply section of the hot water storage tank, and flows into the hot water storage section from the opening at the bottom of the water guide plate. When the water in the hot water storage tank 1 reaches a predetermined amount, the water is detected by the water detection means, and the water in the hot water storage section is heated by the heater. Furthermore, since the water guide plate has a structure with low thermal conductivity, only the water in the hot water storage section is boiled, and impurities are not deposited in the water supply section, thereby preventing impurities from adhering to the water detection means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of an embodiment of the present invention. Note that the same or equivalent parts as those of the conventional example explained in FIGS. 4 and 5 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, 7 is a hot water storage tank 1 with an open bottom.
9 is a water detection electrode arranged below the water supply pipe 2 of the water supply part 1b;
Like the water detection electrode 9a described in FIG. 5, it is composed of an insulating part 9b, an electrode rod 9c, and the like. Reference numeral 17 denotes a water conduit pipe arranged so that water from the water supply pipe 2 hits the insulating portion 9b of the water detection electrode 9.

Next, the operation of the present invention will be explained. First, when water from the water supply pipe 2 passes through the water conduit pipe 17 and is supplied into the water supply part 1b while hitting the water detection electrode 9, the water flows from the opening at the bottom of the water guide plate 7 to the hot water storage part 1a. When the water level in the hot water storage tank 1 rises and the ball tap 3 reaches a predetermined position, water supply is stopped by the action of the ball tap 3. At this time, even if the water supply is not stopped even though the water exceeds a predetermined water level, the excess water is discharged from the overflow pipe 4 and the water does not overflow from the hot water tank 1. Further, if impurities 15 are attached to the insulating portion 9b, water is supplied while hitting the water detection electrode 9, so that the impurities can be removed by the force of the water.

When the water in the hot water storage tank 1 reaches a predetermined amount, a weak current flows between the water detection electrode 9 and the hot water storage tank 1, and this current becomes a water detection signal that is input from the water detection electrode 9. circuit 1
A signal is sent to 0. The input circuit 10 receives signals from the temperature sensor 8 and the water detection electrode 9, and controls the temperature control mechanism 12.
A signal is simultaneously sent to the operation control mechanism 13 to cause the temperature control mechanism 12 to start temperature control. When the signal from the temperature sensor 8 is input through the input circuit 10, the temperature control mechanism 12 initially becomes much lower than the reference value because the water in the hot water tank 1 is water, so the temperature control mechanism 12 connects the electric heater 6 to the output circuit 11. Sends a signal to turn on electricity. On the other hand, the operation control mechanism 13 sends a signal to the output circuit 11 to energize the electric heater 6 based on the signal from the water detection electrode 9. Then, the output circuit 11 energizes the electric heater 6 based on signals from the temperature control mechanism 12 and the operation control mechanism 13 to boil the water in the hot water tank 1 .

When the temperature of the water in the hot water storage tank 1 rises and the signal level of the temperature sensor 8 reaches the reference value, the temperature control mechanism 1
2 sends a signal to the output circuit 11 to de-energize the electric heater 6, and the output circuit 11 de-energizes the electric heater 6.

[0014] While the electricity is on, the water level of hot water in the hot water storage tank 1 is
If the water drops below the water detection electrode 9 due to hot water supply, etc., the hot water storage tank 1
Current no longer flows between the two, and the operation control mechanism 13 sends a signal to the output circuit 11 to stop the energization of the electric heater 6, thereby stopping the energization of the electric heater 6.

FIGS. 2 and 3 are diagrams illustrating the configuration of other embodiments of the present invention. Note that the same parts as in the embodiment of FIG. In the embodiment shown in FIG. 2, the water guide pipe 17 in FIG. 1 is omitted, and the water guide plate 7 has a structure with low thermal conductivity so that even if the temperature of the hot water storage section 1a rises, the temperature of the water supply section 1b does not rise. be. Note that this water guide plate 7 may be made of a double structure of plates, or may be made of a material with a heat insulating material sandwiched between the plates, or may be made of a material with low thermal conductivity.

In this embodiment constructed as described above, water is supplied from the water supply pipe 2 into the hot water storage tank 1 and boiled in the same way as in the embodiment shown in FIG. At this time,
In the hot water tank 1, the water in the hot water storage section 1a is boiled by the water guide plate 7, but the water in the water supply section 1b is hardly boiled, and impurities 15 are not deposited in the water supply section 1b. There is no fear that impurities 15 will adhere.

The embodiment of FIG. 3 is similar to the water pipe 1 of the embodiment of FIG.
7 and the water guide plate 7 of the embodiment shown in FIG. Also in this embodiment configured as described above, water is supplied from the water supply pipe 2 into the hot water storage tank 1 in the same manner as described in the embodiment of FIG. to prevent impurities 15 from being deposited in the water supply section 1b. Note that if impurities 15 in the hot water storage section 1a adhere to the water detection electrode 9, the impurities 15 will be removed by the force of water from the water pipe 17.
can be dropped.

[0018]

[Effects of the Invention] As described above, this invention provides a water detection means for detecting the water level below the water supply pipe, and also provides a water conduit pipe for dropping water from the water supply pipe to the water detection means, so that impurities are prevented. It does not easily adhere to the insulating part of the water detection means, and even if it does, the impurities can be removed by the force of the water. In addition, since the water guide plate has a structure with low thermal conductivity, only the water in the hot water storage section is boiled, impurities are not deposited in the water supply section, and adhesion to the water detection means is prevented, allowing accurate water detection. Can be done. Further, the water detection means does not deteriorate due to heat.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram of an embodiment of the present invention.

FIG. 2 is a configuration explanatory diagram of another embodiment of the present invention.

FIG. 3 is a configuration explanatory diagram of still another embodiment of the present invention.

FIG. 4 is a diagram illustrating the configuration of a conventional electric water heater.

FIG. 5 is an enlarged view of the main part of FIG. 4;

[Explanation of symbols]

1 Hot water storage tank 1a Hot water storage section 1b Water supply part 2 Water supply pipe 6 Electric heater 7 Water guide plate 7a, 17 Water pipe 8 Temperature sensor 9,9a Water detection electrode 9b Insulation section 9c Electrode rod 12 Temperature control mechanism 13 Operation control mechanism 15 Impurities 16 Moisture

Claims (3)

[Claims] 1. A hot water storage tank divided into a hot water storage part and a water supply part by a water guide plate with an open bottom, a water supply pipe connected above the hot water storage tank and opened above the water supply part, and a hot water storage in the hot water tank. The water supply pipe has a hot water supply pipe connected to the water supply pipe, and a heater provided in the hot water storage part, and a water detection means for detecting the water level is provided below the water supply pipe. An electric water heater characterized by being equipped with a water pipe that allows water to fall. 2. A hot water storage tank divided into a hot water storage part and a water supply part by a water guide plate with an open bottom, a water supply pipe connected above the hot water storage tank and opened above the water supply part, and a hot water storage in the hot water storage tank. The water supply pipe has a hot water supply pipe connected to the water supply pipe, and a heater provided in the hot water storage part, and a water detection means for detecting the water level is provided below the water supply pipe, and the water guide plate has a structure with low thermal conductivity. An electric water heater that is characterized by: 3. The electric water heater according to claim 1, wherein the water guide plate has a structure with low heat conduction.