JP3026192U - Boil time extension device for electric water heater - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a device for extending the boiling time of an electric water heater. SOLUTION: One layer of a plastic cap corresponding to the detection part is fitted outside the front side detection part of the upper temperature controller provided above the water level indicating line of the heating cylinder, and the rear surface of the plastic cap is fitted. And a space is provided at the front end face of the detection unit of the upper temperature controller, and the detection unit of the upper temperature controller obtains a predetermined working temperature set after a certain time delay and switches off the switch on the rear side. The delay of heating stop of the electric heating device is controlled, and the boiling time is relatively extended.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a type of boiling time extender for an electric water heater, and in particular, it has a structure in which a detection part of a temperature controller is surrounded by a plastic cap at an appropriate interval. The low thermal conductivity of air lowers the thermal conductivity of heat from the inside of the heating cylinder to the detection part of the temperature controller and extends the boiling time.

[0002]

[Prior art]

 The surface of the detection part of the temperature controller currently used in electric water heaters is made of stainless steel and is in direct contact with the substance that is the target to be detected, so that the temperature of the detected object can be detected quickly. Then, it promptly informs the temperature controller. The temperature controller performs the switching operation at the set working temperature (generally 96 ± 3 ° C). However, the boiling point of water is generally 100 ° C, but the temperature controller that controls boiling has a certain error. If the upper limit of temperature control is set to (96 ± 3 ± tolerance), the boiling point will be exceeded. However, there is a risk that the water will boil continuously and not stop. If the lower limit control is adopted, on the other hand, the raw water is completely boiled and the water is switched before it reaches 100 ° C and is kept warm. I will end up. For this reason, an electronic circuit type reboiler has already been installed to extend the boiling time and prevent the occurrence of the aforementioned drawbacks. However, this type of electronic circuit type reboiler has the following drawbacks. 1. Due to the high temperature of the product itself and the humidity, the electronic circuit device was prone to failure. 2. Various electronic parts are required to assemble the circuit and the assembly is troublesome, and it is necessary to adopt precision electronic parts in order to operate normally at high temperature.The unit price is high and the installation is troublesome. Manufacturing costs have increased.

[0003]

[Problems to be solved by the device]

 The present invention has a structure in which the detection part of the temperature controller is surrounded by a plastic cap at an appropriate interval. Due to the low thermal conductivity of the plastic cap and air, heat is generated in the heating cylinder. An object of the present invention is to provide a kind of boiling time extension device for an electric water heater that lowers the thermal conductivity to the detection part of the temperature controller and extends the boiling time.

[0004]

[Means for Solving the Problems]

 According to the invention of claim 1, at least one casing capable of accommodating the heating cylinder and one heating cylinder having one accommodation space inside thereof are provided, and one upper positioning hole provided above the heating cylinder is provided. One upper temperature controller is attached with a fixed frame and a screw via a seal member, and one lower temperature controller is attached with a positioning frame and a screw below the heating cylinder. One electric heating device connected to the upper temperature controller and the lower temperature controller is fixed by the circuit, and the water level indicator is provided on the heating cylinder and the upper temperature controller is provided above it to provide the upper temperature controller. A cap made of plastic corresponding to the detection part is fitted on the outside of the detection part on the front side of, and a space is provided between the back surface of the plastic cap and the front end face of the detection part of the upper temperature controller. The upper temperature control The detector switches off the rear to obtain a predetermined working temperature which is set after a certain time delay, and delay control heating stop of the heating device, it is assumed to extend the relatively boiling time.

[0005]

[Embodiment of device]

 The boiling time extending device for an electric water heater of the present invention comprises at least one casing capable of accommodating a heating cylinder and one heating cylinder having one accommodation space therein, and is provided above the heating cylinder. One upper temperature controller is attached to one upper positioning hole via a seal member with a fixed frame and a screw, and one lower temperature controller is attached to the lower part of the heating cylinder with a positioning frame and a screw. One heating device connected to the upper temperature controller and the lower temperature controller by a circuit is fixed to the heating cylinder, and a water level indicator line is provided on the heating cylinder, and the water level indicator line is provided above the water level indicator line. An upper temperature controller is provided, and one layer of a plastic cap corresponding to the detection unit is fitted outside the front detection unit of the upper temperature control unit, and the back surface of the plastic cap and the upper temperature control unit are fitted. Inspection of vessels A space is provided on the front end face of the outlet, and the detection part of the upper temperature controller obtains a predetermined working temperature after a certain time delay and turns off the switch on the rear side to stop heating of the electric heating device. Is controlled to delay the boiling time relatively.

With a general material, the thermal conductivity under the same temperature condition is metal> nonmetal (plastic, glass, wood, etc.)> Air, and in the present invention, due to the characteristics of this material, plastic Using the low thermal conductivity of the cap and air, at the same time, the temperature of the inner cylinder of the electric water heater> the temperature of the back of the plastic cap> the temperature of the surface of the temperature controller. When the water in the heating cylinder is heated to a boiling point of 100 ° C from room temperature of 25 ° C, the thermal conductivity coefficient is affected by the temperature. Therefore, when the temperature becomes higher than room temperature, the value of the thermal conductivity coefficient increases with the temperature. Get lower. Therefore, the temperature detected on the surface of the temperature controller does not become 100 degrees, and a certain temperature difference occurs. At this time, the water in the heating cylinder is continuously heated because the temperature detected by the temperature controller does not reach the work switching temperature (96 ± 3 ° C). In this way, it is heated for a certain time (about several minutes), the temperature inside the heating cylinder is kept at the boiling point for a certain time, and the heat is continuously transferred to the surface of the temperature controller through the plastic cap and air, When the surface of the temperature controller reaches the work switching temperature (96 ± 3 ° C), the heating power source is switched to the heat retention setting.

The following Equation 1 holds for general thermal conductivity (three-dimensional), the amount of heat unidirectionally conducted in the present invention, and its unidirectional thermal conductivity.

[Equation 1] The same applies to the thermal conductivity of the second detection surface (the back surface of the plastic cap) and the third detection surface (the surface of the temperature controller). Further, when tested, K values of K = 0.15, plastic = 0.016, air = 0.000057 were obtained for stainless steel, and by substituting these values into the above mathematical formula 1, It is clear that thermal conductivity> plastic thermal conductivity> air thermal conductivity. Due to this difference in thermal conductivity, when the temperature inside the heating cylinder reaches the boiling point of 100 ° C, the temperature detected by the detection part of the temperature controller is affected by the media such as plastic and air. The temperature becomes lower than the actual temperature (for example, 92 ℃). At this time, the temperature controller cannot switch to the heat retention setting yet, so the heating cylinder continues to be heated and the boiling point is maintained at 100 ℃ for several minutes. The water is completely boiled. The function of extending the boiling time eliminates the fluorine in the water and kills the pathogenic bacteria.

[0008]

【Example】

 1 to 5 show a boiling time extending device for an electric water heater according to the present invention, which includes at least one casing 1, one heating cylinder 2, one upper temperature controller 3 and one lower temperature. And a controller (not shown in the figure).

The casing 1 is capable of accommodating the heating cylinder 2. Above the casing 1, a switch 31 on the rear side of the upper temperature controller 3 installed in the upper positioning hole 21 of the heating cylinder 2 is provided. A corresponding hole 11 is bored, and one push button 12 that covers the switch 31 is fitted into the hole 11 via a spring 13 so that the push button 12 can be pressed.

Inside the heating cylinder 2, one accommodation space 20 is formed, and a water level indicator line 22 is provided to contain an appropriate amount of water. Moreover, one upper positioning hole 21 is formed above the heating cylinder 2, and one upper temperature controller 3 is fixed by a fixing frame 24 and a screw 25 via a sealing member 23. Further, a positioning frame (not shown in the figure) is fixed below the heating cylinder 2. Further, one heating device 4 is attached to the heating cylinder 2, and the heating device 4 is connected to the upper temperature controller 3 and the lower temperature controller by a circuit.

The detection unit 32 on the front side of the upper temperature controller 3 is placed in the upper positioning hole 21 of the heating cylinder 2, and thereby the temperature inside the heating cylinder 2 can be detected. When the detected temperature reaches the set upper limit temperature (for example, 96 ° C.), the switch 31 on the rear side of the upper temperature controller 3 bounces and the electric heating device 4 connected thereto stops heating. Further, when the detected temperature reaches the set lower limit temperature (for example, 85 ° C.), the switch 31 is turned on and the electric heating device 4 starts heating.

The lower temperature controller (not shown in the figure) detects the temperature of the water contained in the heating cylinder 2 by the detection unit on the front side thereof, and when the detected temperature reaches the set lower limit temperature, the electric heat The device 4 is controlled to start heating.

The feature of the present invention is that the plastic cap 5 is fitted to the detection portion 32 of the upper temperature controller 3 provided above the water level indicator line 22 of the heating cylinder 2, and the plastic cap 5 One predetermined space 30 is provided between the back surface 51 (see FIG. 5) and the front surface 321 of the detection unit 32 of the above-mentioned upper temperature controller 3, whereby the detection unit 32 is After a certain time delay, the temperature of the predetermined working temperature surface is detected, and the switch 31 on the rear side is delayed and bounced off to delay and stop the heating of the electric heating device 4, thus extending the heating time by a certain time. The object of the present invention to prolong the boiling time is achieved.

Further, it is desirable that the plastic cap 5 of the detection part 32 on the front side of the above-mentioned upper temperature controller 3 is made of thermosetting plastic having high temperature resistance and safety, and the plastic cap 5 is used. A vent hole 511 is formed in the back of the cap to make the internal and external pressures the same and prevent the plastic cap 5 from being deformed.

Further, in this embodiment, the thickness of the surface of the plastic cap 5 is 0.025 cm, and the back surface 51 of the plastic cap 5 and the front end of the detection part 32 of the upper temperature controller 3 are. The distance between the surfaces 321 is 0.1 cm (see FIG. 6). Taking the case where the heating rate (K ° C / min) of the heating cylinder 2 is constant and the switching temperature is 96 ° C as an example, the temperature gradient change curve is shown in Fig. 7 and further applied in the present invention. You will understand the principle. In addition, T ₁ = temperature of the primary detection surface (the surface of the plastic cap), T ₂ = temperature of the secondary detection surface (the back surface of the plastic cap), T ₃ = surface temperature of the temperature controller , X ₁ = coordinate value of the primary detection surface (surface of the plastic cap), X ₂ = coordinate value of the secondary detection surface (back surface of the plastic cap), X ₃ = of the temperature controller It is the coordinate value of the front end face of the detection unit.

[0016]

[Effect of device]

 The boiling time extending device for an electric water heater according to the present invention has a structure in which a plastic cap is fitted to the detection part of the temperature controller at an appropriate interval, and the plastic cap and air have low thermal conductivity. By this, the heat conductivity from the inside of the heating cylinder to the detection part of the temperature controller can be lowered and the boiling time can be extended, which can sterilize the bacteria in the raw water and remove the fluorine. , Can provide safer water.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of an electric water heater of the present invention.

FIG. 2 is a perspective view of the electric water heater according to an embodiment of the present invention with an upper lid open.

FIG. 3 is a partially exploded perspective view of an embodiment of the present invention.

FIG. 4 is a partial perspective view of an embodiment of the present invention.

FIG. 5 is a partial combination sectional view of an embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a distance between a plastic cap and a detection unit of a temperature controller according to an embodiment of the present invention.

FIG. 7 is a reference showing a temperature gradient change curve when the thickness of the plastic cap is 0.025 cm and the distance to the detection part of the temperature controller is 0.1 cm in the embodiment of the present invention. It is a figure.

[Explanation of symbols]

1 ... Casing 2 ... Heating cylinder 3 ... Upper temperature controller 21 ... Upper positioning hole 31 ... Switch 11 ... Hole 12 ... Push button 13 ... Spring 20 ...・ Accommodation space 23 ... Seal member 24
... Fixed frame 25 ... Screw 4 ... Electric heating device 32 ... Detector 22 ... Water level indicator line 5 ...
-Plastic cap 51-Plastic cap back surface 321-Upper temperature controller detection unit front surface 511-Ventilation hole

Claims (1)

[Scope of utility model registration request] 1. At least one casing capable of accommodating a heating cylinder and one heating cylinder having one accommodation space therein, wherein a sealing member is provided in one upper positioning hole provided above the heating cylinder. One upper temperature controller is attached with a fixed frame and a screw, and one lower temperature controller is attached with a positioning frame and a screw below the heating cylinder. One electric heating device connected to the temperature controller and the lower temperature controller is fixed, the heating cylinder is provided with a water level indicating line, and the upper temperature controller is provided above the water level indicating line, and the upper temperature control is provided. A plastic cap corresponding to the detection part is fitted on the outside of the detection part on the front side of the container, and a space is provided between the back surface of the plastic cap and the front end face of the detection part of the upper temperature controller. And the The detection part of the temperature controller obtains a predetermined working temperature set after a certain time delay and turns off the switch on the rear side to delay control the heating stop of the electric heating device, the boiling time extension device of the electric water heater .