JPH081705Y2 - Electric hot water storage container - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hot water storage container for heating and retaining the temperature of a liquid contained in the container.

[0002]

2. Description of the Related Art Generally, such an electric hot water storage container is provided with an outer case, an inner container housed and fixed in the outer case, and a water heater and a heat insulator provided in close contact with the bottom rear surface of the inner container. Two heaters, a power supply circuit that supplies power to the two heaters, a heater control circuit that controls the supply state of power to the two heaters, and a constant voltage power supply for control to the heater control circuit. And a constant voltage power supply circuit.

The constant voltage power supply circuit and the heater control circuit are mounted on an upper portion of a bottom member provided on the bottom portion of the outer case, for example, in a hat-shaped cross section and having a high heat insulating property. Is stored in. The constant voltage power supply circuit and the heater control circuit are respectively provided on a control board (printed board), and are housed by fixing the control board to the back surface side of the upper wall of the electric circuit housing having the hat-shaped cross section. There is.

By the way, the control board on which the constant voltage power supply circuit and the heater control circuit are formed is connected to a heater and an AC power supply as shown in FIG. 5, for example, to form a control system thereof.

That is, in FIG. 5, reference numeral 8A is a main heater for boiling water, and reference numeral 8B is a sub-heater for keeping heat. The main heater 8A and the sub heater 8B
Is an AC power source of 100V via the first connection terminal Ta.
Connected to the power supply terminal TE. Also, reference numeral 5
Reference numeral 0A denotes a heater control unit which is provided on the control board 50 and controls the power supply state to the main heater 8A and the sub heater 8B. The heater control unit 50A has a constant voltage power supply circuit 50B for forming a control voltage. It is annexed. Then, an AC power supply voltage reduced to a predetermined voltage value is input to the power supply input terminal T ₁ on the control board 50 via the temperature fuse TF and the voltage drop resistor R for the constant voltage power supply. Has become.

The other terminal of the main heater 8A is connected to the connector terminal T ₃ on the control board 50 side through the second connection terminal Tb. On the other hand, the other terminal of the sub-heater 8B is connected to the connector terminal T ₂ on the control board 50 side. And the main heater 8
A and the sub-heater 8B are connected to the heater control unit 50A via the connector terminals T ₃ and T ₂ .
The heater control unit 50A controls the energization state.

Reference numeral TS is a bottom sensor, and the bottom sensor TS is provided with its sensing surface in contact with the central bottom portion of the inner container, and detects the hot water temperature in the inner container to perform the above control. Input to the unit 50A. Also, reference numeral 51
Is a switch board provided in the front part of the lid member above the outer case, and reference numeral T ₄ is an AC power supply terminal for the control board 50.

By the way, the voltage drop resistor R for the constant voltage power supply is connected to the power supply voltage (AC100) input to the constant voltage power supply circuit 50B for the heater control unit 50A as described above.
V) is used as a voltage lowering means for lowering it to a predetermined voltage value. As the voltage lowering means, the cost of parts is lower than the case where a step-down transformer is used, the wiring is easy, and the installation space is small. There is a merit in that it is completed.

However, since the resistance R has a large resistance value of, for example, about 1.2 kΩ depending on the control voltage on the side of the heater control unit 50A, the amount of heat generated is considerably large.

As a result, special consideration needs to be given to the installation and mounting position, and electronic components such as ICs, which are vulnerable to heat, cannot be installed on the adjacent control board 50 in an extremely limited space. There is a problem that the power consumption of the device itself needs to be increased by about 3 to 4 Wh due to the power loss due to the heat generation.

Therefore, for the purpose of solving the problem, conventionally, for example, as disclosed in Japanese Utility Model Publication No. 4-36757, a voltage drop resistor R for the constant voltage power source is provided on the bottom rear surface side of the inner container. The heat generation amount of the voltage drop resistance R is transmitted to the inner container side through the component mounting plate by fixing the periphery of the heater portion in contact with the back surface of the component mounting plate integrally mounted in a state of covering the heater portion. Thus, there is one that is effectively used for heating the liquid in the inner container.
By doing so, the heat generated from the voltage drop resistance R also becomes energy for heating the liquid contained inside through the inner container, and energy can be saved. Also,
In particular, a dedicated space for installing the voltage drop resistor in consideration of heat resistance is not required, the body of the hot water storage container can be made compact, and the heat generated by the resistor itself can be efficiently dissipated to the container side, so that the life thereof is extended.

[0012]

However, in the structure of the above-mentioned conventional example, the heat generation amount of the resistor itself can be effectively utilized, but on the other hand, the inner container of the component mounting plate inevitably considering the heat transfer property. In addition to the need for a special mounting structure dedicated to, the installation location of the resistor is far from the original control board, the routing amount on the wiring also increases, and the wiring amount, terminals,
There is a problem with an increase in the number of parts such as connectors, assembly, and man-hours. Further, if the component mounting plate is positively heated, the components to be mounted are also restricted.

Further, the effective use of the heat generation amount and the extension effect of the resistance life due to the heat radiation effect in the structure of the conventional example described above are sufficiently effective from the cold state of the liquid in the inner container to the boiling point. However, it does not so much after the boiling to the heat retention process, and rather, the resistance R is always received by the heat from the heater side and placed in a high temperature environment through the inner container and the component mounting plate. It is bad, and durability in that respect becomes a new problem.

[0014]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above problems, and includes an inner container which is housed and fixed in an outer case and which contains a liquid,
A heater provided on the back surface of the bottom of the inner container, and a heater control unit for controlling the heating state of the heater,
A constant voltage power supply circuit that supplies a constant voltage power supply to the heater control unit, a voltage drop resistor for a constant voltage power supply that reduces the AC power supply voltage supplied to the constant voltage power supply circuit to a predetermined power supply voltage, and the heater control. In an electric hot water storage container comprising a unit and a control board on which a constant voltage power supply circuit is installed, the control board by dividing the voltage drop resistance for the constant voltage power supply into a plurality of resistors each having a predetermined resistance value. It is characterized in that it is installed on top and they are connected on the same control board.

[0015]

As described above, the electric hot water storage container according to the present invention stores and fixes the inner container in which the liquid is stored in the outer case, the heater provided on the bottom rear surface of the inner container, and the heater. A heater control unit that controls a heating state, a constant voltage power supply circuit that supplies a constant voltage power supply to the heater control unit, and a constant voltage power supply that lowers an AC power supply voltage supplied to the constant voltage power supply circuit to a predetermined power supply voltage. In a hot water storage container comprising a voltage drop resistor for a constant voltage power source and a control board on which the heater control unit and the constant voltage power source circuit are installed, a plurality of voltage drop resistors for the constant voltage power source each having a predetermined resistance value are provided. The resistors are divided and installed on the control board, and they are connected on the control board.

Therefore, in this configuration, the heat generation amount of each resistor is reduced by the amount corresponding to the division, and the reduced heat generation amount is individually radiated by each resistor, so that the substantial heat radiation effect is also enhanced. Therefore, it is sufficient to dissipate heat only to the space, and there is no restriction on the installation location, and it is possible to install the IC on a control board having an IC that is weak against heat.

Further, as a result of being installed on the control board in this way, the connection to the terminals on the AC power supply side and the constant voltage power supply circuit side can be made very easily by the pattern wiring on the control board.

[0018]

As a result of the above, according to the present invention, it is easy to install, and there is no need for long lead wires or wiring harnesses and many connector parts as in the prior art, which reduces the cost of parts and assembly. , It can contribute to the reduction of wiring work man-hours.

[0019]

1 to 4 show the construction of an electric hot water storage container according to an embodiment of the present invention.

The electric hot water container body of this embodiment is provided with, for example, a content liquid pouring passage and a bellows type manual air pump so that the liquid can be easily poured from the content liquid pouring passage only by lightly pressing the air pump portion. It is composed of a pressurized liquid injection type.

In FIG. 1, reference numeral 1 is a cylindrical outer case, and an inner container made of a metal having a good thermal conductivity is provided inside the outer case 1 while keeping a predetermined space 2a in the radial direction. 3 is provided.

A bottom member 4 made of synthetic resin is integrally provided on the bottom of the outer case 1, and the outer case 1 is fixedly supported on the bottom member 4. And this bottom member 4
An electric circuit storage box 5 having a hat-shaped cross section is provided below the upper housing wall 6 extending in the horizontal direction.

The upper surface portion 6a of the upper housing wall 6 of the bottom member 4 and the rear surface portion 3d of the inner container 3 are separated by a predetermined distance to form a predetermined heat insulating space 2b. There is.

On the other hand, the center of the bottom of the inner container 3 is on the upper side.
A concave portion 7 for mounting an electric heater is formed in a predetermined depth on the inner side of the inner container. Inside the concave portion 7, the electric heater for heating the inner container (upper and lower as shown in FIG. 3) is formed. (It is composed of an integrated main heater 8A and sub-heater 8B) 8
Are installed in close contact with each other so that the heat transfer performance is as good as possible. Note that reference numeral 9 is a power supply line portion (a bundle portion) that electrically connects the power supply plug portion 10 of the power supply terminal 61 and the connection terminals 71 and 72 (see FIGS. 2 and 3) of the electric heater 8.

Further, reference numeral 11 denotes a content liquid pouring-out portion, and the content liquid pouring-out portion 11 is provided at a radially outer peripheral end portion of the concave portion 7, that is, near the inner wall surface 3a side of the inner container 3. Has been. A pipe-shaped content liquid outlet passage 12 is connected to the content liquid outlet 11 on the back side of the bottom surface of the inner container 3. The content liquid discharge passage 12
Is bent in a J shape from the bottom rear surface side of the inner container 3 to the upper side of the front surface of the outer case 1, and between the front wall rear surface 1a of the outer case 1 and the front wall surface 3b of the inner container 3. A beak portion 14 that extends upward in the space 2a and is formed on the front side of the shoulder member 13 provided on the upper side of the outer case 1.
After passing through the check valve 15 in the inside, it is bent again obliquely downward to the front side and opened at the portion of the liquid injection guide 16, and the content liquid in the inner container 3 is injected outside through the liquid injection guide 16. It is like this.

On the other hand, the shoulder member 13 has an opening 19 for opening and closing a lid 18 having an air pump portion 17 in a substantially central portion thereof, and has an opening 19 at an upper edge portion of the outer case 1. It is engaged and supported, and the upper edge 3c of the inner container 3 is locked and supported by the lower edge 19a of the opening edge of the opening 19.

The lid 18 includes an outer lid portion 18A and an inner lid portion 18B.
The outer cover 18A has a hinge 20 at its rear end.
It is pivotally attached to the rear end portion 13a of the shoulder member 13 through the above so as to be rotatable up and down, whereby the entire lid 18 is opened and closed vertically. And this outer lid part 1
In the center of 8A, the air pump portion 17 having a bellows structure and a pressing plate portion 21 for pressing the air pump portion 17 are operated.
On the other hand, the inner lid portion 18B is further provided at the lower portion thereof, and the inner lid portion 18B is press-fitted to the upper opening edge portion 3c of the inner container 3 via the seal member 22. It is like this.

The air pump portion 17 includes the inner lid portion 18
An air blowing passage 23 and a steam escape passage 24 are formed between the air blow passage 23 and B.

In this embodiment, when the content liquid (for example, tap water) in the inner container 3 is heated by the electric heater 8, steam containing residual chlorine generated from the content liquid is introduced into the air blowing passage 23. And it is designed to be discharged to the outside through the vapor escape passage 24. At this time, since the air discharge port 17a of the air pump unit 17 is closed by the valve body 35, the steam passing through the air blowing passage 23 does not enter the bellows 17b.
Then, after boiling, for example, when a predetermined descaling time controlled by a microcomputer of a control unit 50A described later in the electric circuit storage box 5 elapses and the boiling water is finished, the control operation of the control unit 50A causes the electricity to be discharged. The energization state of the AC power supply 100V to the heater 8 is automatically switched from the energization state of both the main heater 8A and the sub-heater 8B to the energization state of only the heat-retaining sub-heater 8B, and the liquid temperature in the inner container 3 is kept constant. It is designed to be kept warm to the temperature.

When the pump pressing plate portion 21 is pressed,
Pressurized air from the bellows 17b of the air pump unit 17 is blown into the inner container 3 through the air blowing passage 23.
(At this time, the vapor escape passage 24 is closed by the valve element 35), and the pressurized air causes the content liquid in the inner container 3 to be discharged to the outside through the series of content liquid discharge passages 12 as described above. Be done.

On the other hand, on the lower portion of the inner wall surface 3a of the inner container 3, a step portion (step portion) which displays the minimum remaining amount of the content liquid contained in the inner container 3 and also serves as a reinforcement of the inner wall portion 3a. The surface) 27 is formed.

By the way, in the electric circuit housing box 5 having the hat-shaped cross section, for example, as shown in FIG. 3, a control unit 50A and a constant voltage power supply circuit 50B for supplying a constant voltage power supply to the control unit 50A (see FIG. 4)), variously divided first and second voltage drop resistors R ₁ and R ₂ for the identification voltage power supply circuit 50B, the connector 56 for the switch board 55, and the bottom sensor 57. Connector 58, heater 8 connector 59, magnet lamp 6
4 and the temperature fuse TF connector 60, the power supply terminal 61 connectors 62a and 62b, and the like are provided on the control board 63, which are screwed to the upper wall surface 5a so that the above components are on the lower side. . The voltage drop resistance R
₁ and R ₂ are composed of, for example, those having the same resistance value, and the combined resistance value thereof is the conventional voltage drop resistance R described above.
Are arranged on the control board 63 in different directions so as to be orthogonal to each other as shown in the drawing, and are connected to each other in a printed pattern in series, for example.

The power supply terminal 61, the heater 8, the magnet lamp 64, the temperature fuse TF, the switch board 55, and the bottom sensor 57 are respectively provided with predetermined lead wires (or wire harnesses) L _{1 to} L ₁₀ as shown in FIG. In addition, it is connected to the control board 63 via the respective connectors 62a, 62b, 59, 60, 56, 58.

In the mounted state, the control board 63 shown in FIG. 3 is, for example, as shown in FIG. 2, the upper wall surface 5 of the upper portion inside the electric circuit storage box 5 inside the bottom portion of the outer case 1.
housed fixed as described above to a side, each connector 62a described above, 62b, multiple through 59,60,56,58 parts of lead wires _{L 1, L 2, L 3} , L 4, L 5 , L ₆ are drawn out and connected to the respective electric parts such as the corresponding heater-side first and second connection terminals 71, 72 with a good space factor. FIG. 4 shows the connected state as an electric circuit.

As described above, in the configuration of the present embodiment, the voltage drop resistors for the constant voltage power supply circuit 50B have the first and second pluralities each having a predetermined resistance value (the same value in the above embodiment). The resistors R ₁ and R ₂ are divided and installed on the control board 63, and they are connected in series on the control board 63 by pattern connection.

Therefore, in this configuration, the heat generation amount of each of the first and second resistors R ₁ and R ₂ is reduced by the amount of division (1/2 in the embodiment), and the reduced heat generation amount. Since the respective resistors R ₁ and R ₂ radiate heat individually, the substantial heat radiation effect is also enhanced. Therefore, it is sufficient to radiate heat to the space below the control board 63 in the electric circuit storage box 5, is not restricted by the installation location, and has a heat-sensitive electronic component such as an IC as in the above embodiment. No problem arises even if it is installed on 63. The heat radiation effect is obtained by each resistor R ₁ ,
It is more advantageous to install R ₂ so as to be orthogonal to each other as in the above embodiment, as there is no influence of the radiant heat, rather than to arrange R ₂ in parallel with each other. Also, if there is room in the lower space,
It is also effective in increasing the heat radiation effect to increase the length of the legs of the resistors R ₁ and R ₂ and to install them by making the lengths different from each other.

Further, in this way, the voltage drop resistors R ₁ , R
As a result of installing ₂ on the control board 63, the connection to the AC power supply side terminal and the constant voltage power supply circuit side terminal is also related to the control board 63.
The above printed pattern wiring makes connection extremely easy.

Therefore, it is not necessary to lay out long lead wires or harnesses and many connector parts as in the prior art, and it can effectively contribute to the reduction of parts cost and the reduction of man-hours such as assembly and wiring. .

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall structure of an electric hot water container according to an embodiment of the present invention.

FIG. 2 is a rear view showing a configuration of an electric circuit housing portion of the bottom portion of the hot water storage container with a bottom member removed.

FIG. 3 is a schematic perspective view showing a wiring and connection state of each electric component of the hot water storage container and a control board.

4 is an electrical connection diagram corresponding to the connection state of FIG. 3 described above.

FIG. 5 is a connection diagram corresponding to FIG. 4 of a conventional electric hot water storage container.

[Explanation of reference numerals] 1 is an outer case, 3 is an inner container, 5 is an electric circuit storage box, 8 is a heater, 63 is a control board, R ₁ is a first voltage drop resistor, and R ₂ is a second voltage drop resistor. Is.

Claims (1)

[Scope of utility model registration request] 1. An inner container, which is housed and fixed in an outer case and contains a liquid, a heater provided on the back surface of the bottom of the inner container, and a heater control unit for controlling the heating state of the heater. A constant voltage power supply circuit that supplies a constant voltage power supply to the heater control unit, a voltage drop resistor for a constant voltage power supply that reduces the AC power supply voltage supplied to the constant voltage power supply circuit to a predetermined power supply voltage, and the heater control. In an electric hot water storage container comprising a unit and a control board on which a constant voltage power supply circuit is installed, the control board by dividing the voltage drop resistance for the constant voltage power supply into a plurality of resistors each having a predetermined resistance value. An electric hot water storage container characterized by being installed on top of the same and connecting them on the same control board.