JPH07110265B2 - Electric water heater - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater having an electric hot water supply function for heating and retaining the contained liquid.

2. Description of the Related Art A conventional electric water heater having an electric hot water supply function is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-173247.
The configuration was as shown in FIG. That is, a method is used in which an alternating voltage is applied to the electromagnetic pump 41, pressurized air by the electromagnetic pump 41 is sent into the container 42 to increase the pressure in the container 42, and thereby the liquid is led out of the body. The operation method is the knob 44 provided on the lid 43.
The switch 45 is operated by pressing to open / close the switch 45 for ON / OFF controlling the energization of the electromagnetic pump 41, and the control was a control as to whether or not the liquid should be discharged.

Problems to be Solved by the Invention In such a conventional configuration, when the liquid in the container 42 is discharged, the liquid is discharged only at a preset constant outflow amount, for example, a relatively small capacity such as a coffee cup. When putting it in the container, the momentum is too strong and the hot water may scatter and cause burns. Conversely, if it is put in a large capacity container such as a pot, it takes time and it is not easy to use. There was a problem.

Further, since it is an air pressurization type, it is necessary to close the vapor passage when the liquid is drawn out, and therefore, a mechanism for closing the vapor passage in conjunction with the pressing operation of the knob is required, resulting in a large operating load and a complicated operation. Depending on the configuration, there is a problem such as an increase in cost.

The present invention solves such a problem, and it is possible to easily obtain an arbitrary derivation amount, to easily perform the derivation amount adjustment operation, and also to save space in the adjustment function unit. An object of the present invention is to provide an electric water heater capable of performing the above.

Means for Solving the Problems In order to achieve the above object, the electric water heater of the present invention,
An electric pump that discharges the liquid in the container to the outside of the body,
A drive circuit that controls the operation of the pump, and a variable portion that constitutes a part of the drive circuit and that adjusts the rotational speed of the pump by an external operation are provided. And, with a knob that works with it,
This knob is slidable in the direction of its rotation axis, and the whole or part of the cam that has the function of repeatedly holding that position at approximately both ends of the sliding position each time the knob is pressed is placed inside the knob. It is arranged in.

Further, in the present invention, in order to save space, all or part of the cam is arranged inside the elevating spring for urging the knob upward.

Further, as another means for saving space, the present invention urges a stopper having an end portion that moves in pressure contact with a groove portion formed in a cam by an elevating spring, or a whole or a part of the elevating spring is held by a knob. At least one of the lower part of the stopper and the lower part of the elevating spring is held by a bearing which is disposed inside the device or which transmits the rotating operation of the knob to the variable part.

Further, according to the present invention, as means for arranging the cam inside the knob, a flange portion is formed on an upper portion of the cam, the knob body has a hole through which the cam body can pass and the collar portion cannot pass. The plate is pressed into or bonded to the inside of the knob with the cam body passing through the hole to fix the knob and the cam.

Effect According to the above configuration, since the variable portion for adjusting the rotational speed of the pump, that is, the amount of liquid derived per unit time proportional thereto and the knob interlocked with this variable portion are operated to rotate, fine adjustment during operation is possible. It is easy to perform, and since it has a cam that has a function of repeatedly holding the position at both ends of its sliding position each time the knob is pressed, this cam can be used, for example, when the knob is pushed in. , If the knob is held so that it is almost stored in the main body, it will not be possible to operate the knob in that state, and as a result, there will be no accidental operation, which is extremely safe and convenient. It is possible to have a clean appearance without unevenness. Further, since the space for the adjusting function portion can be saved by the various means described above, the body can be made compact.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 7 is a longitudinal sectional view of an electric water heater according to an embodiment of the present invention, and FIG. 8 is a perspective view showing its appearance.

In FIGS. 7 and 8, 1 is a main body, 2 is a container having an upper surface opening arranged in the main body 1, 3 is a lid for covering the upper surface opening of the container 2, and the lid 3 is in front of it. By pressing the lock knob 4 provided on the portion, it is possible to open and close the top opening of the container 2 and to attach and detach the main body 1. Reference numeral 5 is a vapor passage communicating with the inside of the container 2, and 6 is a heating element for heating the liquid in the container 2. Reference numeral 7 denotes an electric pump, which is driven by a motor 8 and which is provided with a liquid through a first communication pipe 11 that connects a guide hole 9 provided in the lower portion of the container 2 and a suction port 10 of the pump 7. Is sucked in and the liquid is led out to the outside of the body through a second communication pipe 14 that connects the discharge port 12 of the pump 7 and the outlet 13 to the outside of the body. Reference numeral 15 is a variable portion that constitutes a part of a drive circuit that controls the operation of the pump 7, and that adjusts the rotational speed of the pump 7. The variable portion 15 is a rotary variable resistor. Reference numeral 16 denotes a knob that is interlocked with the variable unit 15 formed of a variable resistor, and constitutes an operation unit 17 together with some components described later.

FIG. 9 shows an example of a drive circuit 40 in which the variable unit 15 composed of a variable resistor is used as the speed adjusting means of the pump 7, and the voltage applied to the motor 8 is changed by the variable unit 15 composed of a variable resistor. By doing so, the motor 8, that is, the pump 7
It controls the rotation speed of.

FIG. 1 shows an example of the configuration of the operating portion 17, and 18 is a cam attached inside the knob 16, and a groove portion 19 is formed on the side surface. The cam 18 is fixed to the knob 16 by forming a collar portion 20 on the upper portion of the cam 18, and the body of the cam 18 can pass through the collar portion 20 and the collar portion 20 cannot pass through the hole.
The cam 18 is fixed to the knob 16 by press-fitting or adhering the knob mounting plate 22 having 21 to the inside of the knob 16 with the main body of the cam 18 passing through the hole 21. Reference numeral 23 is a bearing having a guide portion 24 that is in sliding contact with the main body of the cam 18. Reference numeral 25 is an elevating spring arranged between the knob 16 and the bearing 23, and the elevating spring 25 constantly urges the knob 16 and the cam 18 upward. Reference numeral 26 denotes a stopper attached to the bearing 23. The stopper 26 is urged by the elevating spring 25 so that the end 27 of the stopper 26 is always in the groove portion 19 of the cam 18.
Is pressed with a little force. Further, the variable portion 15 composed of the variable resistor is attached to the case 28 with a nut 29, and its rotating shaft 30 is fitted with the bearing 23, so that both rotate in conjunction with each other.

Reference numeral 31 is a hook spring having one end attached to the bearing 23 and the other end attached to the case 28. The hook spring 31 is a rotary shaft of the knob 16 and the bearing 23 that rotates in conjunction with the knob 16 and the variable portion 15 including a variable resistor. The rotation direction of 30 is biased in a fixed direction. 32 turns on the power to the motor 8 that drives the pump 7.
The switch 32 is an N, OFF switch, and the switch 32 is attached to the case 28 in such a positional relationship that the arm 33 formed on the bearing 23 can be pressed against the lever 34 of the switch 32. When the knob 16 is not operated, the arm 33 of the bearing 23 biased by the hook spring 31 is in pressure contact with the lever 34 of the switch 32. In this case, the power supply to the motor 8 is off. When the knob 16 is rotated against the biasing force of the hook spring 31, the lever 34 of the switch 32 becomes free, the power to the motor 8 is turned on, and the knob 16 operates in conjunction with the knob 16. Then, the rotary shaft 30 of the variable portion 15 composed of the variable resistor rotates, the resistance value changes, and the voltage applied to the motor 8 also increases accordingly, and the rotation speed of the pump 7 increases. Go. This knob 16
By adjusting the rotation angle of, the number of rotations of the pump 7 is adjusted to adjust the amount of the liquid discharged from the container 2 to a desired state. Reference numeral 35 is a cover that covers the opening of the case 28.

The operation part 17 is configured by the above components, and the knob 16 is attached to the bosses 36 and 37 formed in the main body 1 so that the knob 16 becomes a part of the exterior of the device.

FIG. 6 shows an example of the shape of the groove portion 19 of the cam 18,
The path is closed and the bottom has a plurality of steps. The vertical relationship of the step is in one direction, and the stopper
26 is biased by the lifting spring 25, and its end 27 is moved by the cam 18
When moving while being pressed against the groove portion 19, the movement is always counterclockwise. Since the cam 18 is constantly biased upward by the elevating spring 25, at the sliding position of the cam 18,
That position is maintained because the end 27 of the stopper 26 is
when it is located at point a and point b, so knob 16
Each time the button is pressed, the end portion 27 of the stopper 26 is
Mutually held to the point. A guide groove 40 is formed in the lower portion of the cam 18, and after the stopper 26 and the elevating spring 25 are attached to the bearing 23, the cam 18 is guided to the guide portion 24 of the bearing 23.
It is designed to work smoothly when it is inserted into.

2 and 4 show the state when not operated,
In this case, the knob 16 is pushed in and the stopper 26
The end portion 27 of the cam 18 is held in a state of being located at the point a of the groove portion 19 of the cam 18. Also, the rotation position of the knob 16 is
If the resistance value of the variable portion 15 which is biased by 31 and is at one end of the rotation range and is interlocked with the rotation of the knob 16 is set to 0 or substantially 0 at this position, the motor is The voltage applied to 8 becomes 0 or almost 0, and the pump 7 does not operate. At this time, since the arm 33 of the bearing 23 is in pressure contact with the lever 34 of the switch 32, the power supply to the motor 8 is off and the motor 8 is in a completely stopped state.

In this state, by setting the upper surface 38 of the knob 16 to be substantially flush with the peripheral portion 39 of the knob 16 of the main body 1 or a curved surface, the body can be made to have a clean appearance with little unevenness, and Since the knob 16 cannot be operated, an accident such as a burn due to an unexpected operation can be prevented.

FIG. 3 and FIG. 5 show a state at the time of operation. In this case, the knob 16 is projected from the main body 1 by the pressing operation, and the end portion 27 of the stopper 26 is provided with the groove portion 19 of the cam 18. It is held in the state of being located at point b. When the knob 16 is rotated in this state, the rotary shaft 30 of the variable portion 15 composed of a variable resistor rotates in conjunction therewith, and the voltage applied to the motor 8 changes as the resistance value changes. It rises and the rotation speed of the pump 7 increases. Here, the lever 34 of the switch 32 is released from the urging force of the arm 33 of the bearing 23 at the time when the knob 16 is slightly rotated, and becomes a free state. Therefore, the power to the motor 8 is turned on. There is.

If the hand is released during the operation, the knob 16 immediately returns to the original state by the bias of the hook spring 31, that is, the voltage applied to the motor 8 becomes 0 or substantially 0, and the power to the motor 8 is not supplied. It returns to the OFF state and the pump 7 stops.

In this way, by adjusting the rotational position of the knob 16, the amount of liquid discharged per unit time in the container 2 can be selected according to the purpose and preference.

Effects of the Invention According to the present invention, as is clear from the description of the above embodiments,
Since the variable part that adjusts the rotational speed of the pump, that is, the amount of liquid that is proportional to that, and the knob that is interlocked with this variable part are rotated, it is easy to make fine adjustments during operation. Each time the pressing operation is performed, the cam is equipped with a function that repeatedly holds the position at both ends of the sliding position.Therefore, when the knob is pushed in and stored in the main body, the knob can be operated. As a result, an accident such as a burn due to an unexpected operation can be prevented, and the appearance can be made into a clean shape without unevenness.

Also, the cam is placed inside the knob or inside the lift spring, and the stopper is biased by the lift spring,
By arranging the lifting spring inside the knob, holding the stopper or lifting spring by the bearing, etc., the dead space of the operating part can be reduced as much as possible, which is very effective in saving the operating part space. It is a thing.

Furthermore, since the stopper is urged by the elevating spring, another member for the purpose of urging is unnecessary, and thus the effect of reducing the number of parts can be obtained.

Also, by forming a flange on the upper part of the cam, making the cam body pass through the hole of the knob mounting plate, and press fitting or adhering the knob mounting plate inside the knob, the cam is placed inside the knob. It is a more efficient means of placement, which allows the overall body to be more compact.

[Brief description of drawings]

FIG. 1 is an enlarged exploded perspective view of an essential part of an electric water heater showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing the non-operated state of the same, and FIG. FIG. 4 is an enlarged cross-sectional view showing a state during operation, FIG. 4 is a perspective view showing a non-operation state of the main part, and FIG. 5 is a perspective view showing a state of the main part during operation.
FIG. 7 is an enlarged perspective view of a cam portion which is a constituent member of the main part, FIG. 7 is a longitudinal sectional view of the electric water heater, FIG. 8 is an external perspective view of the electric water heater, and FIG. 9 is the electric water heater. FIG. 10 is a vertical cross-sectional view of an electric water heater showing a conventional example. 1 ... Main body, 2 ... Container, 3 ... Lid, 6 ... Heating element,
7 ... Pump, 15 ... Variable part, 16 ... Knob, 18 ... Cam, 20 ... Collar part, 21 ... Hole, 22 ... Knob mounting plate, 23 ...
… Bearings, 25 …… Lifting springs, 26 …… Stoppers, 27 …… Ends of stoppers.

Claims (6)

[Claims] 1. A main body, a container which is disposed in the main body and stores a liquid, a lid which covers an opening of the container, a heating element which heats the liquid in the container, and the inside of the container. Electric pump for discharging the liquid of FIG. 1 to the outside of the body, a drive circuit for controlling the operation of the pump, a part of the drive circuit, and a variable part for adjusting the rotational speed of the pump by an external operation. And a variable operation of the variable portion is a rotary operation, and a knob interlocked with the variable operation is provided, and the knob is slidable in the direction of the rotation axis thereof, and the sliding position of the knob is substantially changed for each pressing operation of the knob. An electric water heater in which all or part of the cam, which has the function of repeatedly holding its position at both ends, is placed inside the knob. 2. The electric water heater according to claim 1, wherein all or part of the cam is arranged inside an elevating spring for urging the knob upward. 3. The electric water heater according to claim 1 or 2, wherein a stopper having an end portion which moves in pressure contact with a groove portion formed on the cam is biased by an elevating spring. 4. A knob mounting plate having a hole formed in the upper part of the cam, the cam body being able to pass through, and the collar part not being able to pass through the cam mounting body. The electric water heater according to claim 1, wherein the knob and the cam are fixed to each other by press-fitting or adhering the inside of the knob. 5. The electric water heater according to claim 2, wherein all or part of the elevating spring is arranged inside the knob. 6. The electric water heater according to claim 3, wherein at least one of a lower portion of the stopper and a lower portion of the elevating spring is held by a bearing that transmits the rotating operation of the knob to the variable portion.