JPH03186224A - Hot water quantity controller for electric boiler - Google Patents

Abstract

PURPOSE:To reduce the operating force by providing a knurl-like ruggedness on a cylindrical peripheral wall part of a control for controlling the discharge quantity of a pump, and making several parts of this knurl-like ruggedness higher than another knurl. CONSTITUTION:An opening part of a container 3 for containing a liquid contained in a body 1 is covered with a body 5, and also, a liquid in the container 3 is heated by a heating element 2. Also, an operation of a motor-driven pump 9 for discharging the liquid in the container 3 to the outside of the body 1 is controlled by a driving circuit. A control part 13 for constituting a part of this driving circuit controls the discharge quantity of the pump 9 by a turning operation from the outside by using a cylindrical control 14. Also, a knurl-like ruggedness 20 is provided on a cylindrical peripheral wall part of the control 14, and several parts of this knurl-like ruggedness 20 are made higher than another knurl. That is, by lowering the turning slide resistance force of the control and the hole of the body, the operating force can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water flow rate regulator for an electric water heater, which is equipped with an electric hot water supply function for heating and keeping a stored liquid warm.

Conventional technology Conventional electric water heaters with electric hot water supply function are
There was a configuration as shown in FIGS.

As shown in the figure, a main body 1, a container 3 with a heating element 2 arranged on the bottom, a lid 6 that covers the opening of the container 3 and has an evaporation passage 4 inside, and a suction lower driven by a motor 6. A pump 9 that sucks in liquid and discharges the liquid from the discharge port 8, a first communication pipe 11 that communicates the suction lower of the pump 9 with the conduit 10 of the container 3, and a first communication pipe 11 that communicates the liquid from the discharge port 8 of the pump 9 with the outside. a second communication pipe 12 leading out to the pump 9; a variable section 13 configured with a rotary variable resistor that forms part of a drive circuit that controls the operation of the pump 9 and adjusts the rotational speed of the pump 9; It is composed of a knob 14 that interlocks with this variable section 13, and an operation section 15 that is constructed together with some parts that will be described later.

FIG. 6 shows an example of a drive circuit using a variable resistor 13 as a speed adjusting means for the pump 9. By changing the voltage applied to the motor 6 with the variable resistor 13, the motor e That is, the rotation speed of the pump 9 is controlled.

FIG. 7 shows the configuration of the operating section 15, in which a cam 17 with a groove 1e formed on the side surface is mounted inside by a cam mounting plate 18, a knob 14, and a main body on the outer periphery of the knob 14. A knurling-like unevenness 2o is formed on the portion excluding the sliding contact portion 19, and a flange 22 having a circumferential lip 21 with a substantially triangular cross section is formed at the lower end. Further, a bearing 24 having a guide portion 23 that is in substantially sliding contact with the cam 17, and a shaft 1 are provided.
4 and the bearing 24, and the knob 14 and the cam 17
a lifting spring 26 that always urges the lifting spring 2 upward;
The stopper 27 is urged by the inner side of the cam 17 so that the end 26 is always pressed against the groove 16 of the cam 17 with a slight force and is attached to the bearing 24, and a rotating shaft 28.
The variable resistor 13 is fixed to the case 29 with a nut 30 or the like, one end is attached to the bearing 24 and the other end is attached to the case 29, and the variable resistor 13 is connected to the variable resistor 13 and the variable resistor 13 is attached to the bearing 24 at one end and the other end is attached to the case 29. The hook spring 31 biases the rotating direction of the bearing 24 and the rotating ring 28 of the variable resistor 13 in a certain direction.
and a switch 34 which is attached to the case 29 in such a position that an arm 32 formed on the bearing 24 can be pressed into contact with the lever 33 and turns ON/OFF the power to the drive motor 6 of the pump 9;
The cover 36 covering the opening of the case 29 and the operating section 15
is constructed and mounted so as to face the hole 3e of the main body 1.

In this configuration, when the knob 14 is not operated, the arm 32 of the bearing 24, which is biased by the hook spring 31,
4, the power to the motor 6 is turned off. Next, when the knob 14 is rotated against the bias of the hook spring 31, the switch 3
The lever 33 of No. 4 is in a free state, and the power to the motor 6 is turned on. Also, the rotating shaft 28 of the variable resistor 13 rotates in conjunction with the knob 14, and the resistance value changes. However, the voltage applied to the motor 6 increases accordingly, and the rotation speed of the pump 9 increases. By adjusting the rotation angle of this recess 14, the number of rotations of the pump 9 can be adjusted to adjust the amount of liquid delivered to the desired state.

If you release your hand while rotating the housing 14, the knob 14 will immediately return to its original state due to the bias of the hook spring 31, that is, the motor 6
The voltage applied to the motor 6 must be 0 or approximately 0, and
The power to the pump 9 is returned to the OFF state, and the pump 9 is stopped.

FIG. 9 shows the shape of the groove 16 of the cam 17.
The path is closed 9 and a plurality of steps are formed at the bottom. When the stopper 27 is biased by the inside of the lifting spring 26 and moves with its end 26 in pressure contact with the groove 16, the movement is always counterclockwise. It becomes shi. Ikei, Cam 17
is always urged upward by the lifting spring 26, so
The sliding position of the cam 17 is maintained when the ends 26 of the stopper 27 are located at points a and b. Therefore, each time the knob 14 is pressed, the position of the stopper 27 is The ends 26 are held alternately at points a and b.

Figure 10 shows the state when not in operation.
is pushed in, and the end 26 of the stopper 27 is held at point a of the groove 1e of the cam 17. Further, the rotational position of the knob 14 is biased by the hook spring 31, and is at one end within its rotational range. In this position, the voltage applied to the motor 6 is 0 or approximately 0, and the pump 9 does not operate. The arm 32 of the housing bearing 24 is the lever 3 of the switch 34.
3 and 9, the power to the motor 6 is OFF, and the motor 6 is completely stopped.

FIG. 11 shows the state during operation, with the housing 14 protruding from the main body 1 by the pressing operation, and the end 26 of the stopper 27 and the cam 17 positioned at point b of the groove 16. is held in When the knob 14 is rotated in this state, the lever 33 of the switch 34 is released from the arm 32 of the bearing 24 and the power to the motor 6 is turned on. Become. On the other hand, as the pump 14 rotates, the voltage applied to the motor e increases, and the rotational speed of the pump 9 increases. If you release your hand while operating the knob 14, the pump 9 is immediately returned to its original state due to the bias of the hook spring 31, the voltage applied to the motor 6 is reduced, and the power is turned off. stops.

Problems to be Solved by the Invention In such a conventional configuration, the knob 14 and the hole 3 of the main body 1
6, the O-let shaped smooth sliding contact portion 19 of the knob 14 and the inner periphery of the hole 36 are connected to the knob 14.
When the hook spring 31 automatically returns after the rotation operation of
Due to the inclination of the rotating shaft when installing to 9, contact occurred, resulting in sliding resistance when returning. To overcome this sliding resistance,
This problem has been dealt with by increasing the load on the hook spring 31, but as a result, the problem arises in that the operating load on the lever 14 increases. If coffee or the like is spilled on this knob part of the casing and it hardens, the sliding contact area is relatively large, so it may cause the slag 14 to stop working when it returns to normal, causing burns etc. due to hot water not coming out. There was an issue with the possibility of danger occurring.

The present invention solves the above-mentioned problems, and reduces the operating force by lowering the rotational and sliding resistance between the knob and the hole in the main body, and further improves the resistance to intrusion of coffee etc. The purpose of the present invention is to provide an electric water heater with an electric hot water supply function that is highly safe.

Means for Solving the Problems In order to achieve the above-mentioned object distantly, the present invention provides a main body, a container for accommodating a liquid contained in the main body, a lid body covering an opening of the container, and a liquid inside the container. A heating element that heats the liquid, an electric pump that discharges the liquid in the container to the outside of the main body, a drive circuit that controls the operation of this pump, and a substantially cylindrical knob that forms part of this drive circuit. a control unit that adjusts the discharge amount of the pump by external rotational operation;
This control section automatically returns when the external rotation operation is released. The one cylindrical circumferential wall is provided with knurling-like unevenness, and the one cylindrical circumferential wall is also provided with the knurling-like unevenness at the portion that comes into sliding contact with the inner circumferential wall of the hole of the main body during rotational operation. , several of the unevenness around the entire circumference are made higher than the height of the other knurls.

Effect: With the above structure, the knurling-like unevenness is provided on the cylindrical peripheral wall of the slurry that adjusts the discharge amount of the pump, and the knurling-like unevenness is also provided on the sliding contact portion with the inner circumferential wall of the hole in the main body during the rotational operation of this one. Since several of the knurlings on the entire circumference are set higher than the other knurlings, the rotational and sliding resistance between the housing and the hole in the main body can be reduced, and the operating force can be reduced. . Even if you spill something on the case, coffee, etc., the contact area between the peripheral wall of the knob and the inner wall of the hole in the main body is small due to the knurling-like unevenness, so there will be no interruption of the knob. , there is no risk of burns due to hot water coming out, and it is extremely safe.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

Since the basic configuration and basic operation are the same as those of the conventional example, the explanation here will be omitted.

As shown in Figures 1 to 4, the knob 4 has knurled concavities and convexities 2o formed on the entire periphery of the cylindrical peripheral wall, and several of the knurled concavities and convexities 2o on the entire circumference are made higher than others. A flange 22 is formed at the lower end, and a lip 21 having a substantially triangular cross section is formed on the circumference of the flange 22. - The hole 36 of the blade body 1 has an inner circumferential wall 37 in sliding contact with the outer periphery of the knob 14.
The receiver in sliding contact with the rib 21 of No. 4 forms a surface 38.

Further, the inner circumferential wall 37 is provided with a thinned-out portion 39 at the lower portion thereof, so that the inner circumferential wall 37 with the hook 14 is further reduced in size.

Thus, according to the present invention, the knob 14 and the hole 3 of the main body 1
Since the sliding resistance of the 6th section with the inner circumferential wall 37 can be made extremely small, the sliding resistance when the hook spring 31 automatically returns after operating the knob 14 becomes extremely small, so that the load on the hook spring 31 is reduced accordingly. can be reduced, and the operating force of the housing 14 can be reduced. In addition, even if coffee or the like is spilled and it hardens, the contact area between the knob 14 and the hole 36 is extremely small, so there is almost no increase in the resistance to return to rotation, so hot water will flow out due to the interruption of the knob 14. It is highly safe as there is no risk of burns caused by burning.

Effects of the Invention As described above, according to the present invention, one knob of the variable part constitutes a part of the drive circuit of the pump and adjusts the discharge amount of the pump by external rotational operation of the knob. The knurling-like unevenness on the cylindrical peripheral wall is also provided at the sliding contact between the main body and the inner peripheral wall of the hole during one rotation operation, so some of the unevenness around the entire circumference are made higher than others. Since the sliding resistance between the knob and the inner circumferential wall of the hole in the main body can be made extremely small, the sliding resistance when the knob is automatically returned by the hook spring after operation is extremely small, so the valve operating force can be reduced, and the valve operation force can be reduced. The quality of the product will be excellent.

In addition, even if coffee or the like is spilled, there will be no interruption, and the electric hot water supply function '5c can be realized with excellent safety and no risk of burns.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one electric water heater equipped with an electric hot water supply function according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts of the water heater, and Fig. 3 is an operating section. FIG. 4 is a cross-sectional view of the same showing when the operating section is not operated, and FIG.
Fig. 6 is an overall sectional view of a conventional electric water heater, Fig. 6 is a circuit diagram showing an example of the pump drive circuit, Fig. 7 is an exploded perspective view showing the configuration of the operating section, and Fig. 8 is a schematic diagram of the pump drive circuit. FIG. 9 is a perspective view showing the relationship between the cam and the stopper, FIG. 10 is a cross-sectional view of the same essential parts when not in operation, and FIG. 11 is a cross-sectional view of the same essential parts when in operation. It is. 13... Control unit, 14... One piece, 2
10...Unevenness.

Claims (1)

[Claims] a main body, a container that accommodates a liquid built into the main body, a lid that covers an opening of the container, a heating element that heats the liquid in the container, and an electric motor that discharges the liquid in the container to the outside of the main body. a drive circuit that controls the operation of the pump, and a control section that is part of the drive circuit and that adjusts the discharge amount of the pump by external rotation using a cylindrical knob. In the electric water heater, the knurling-like unevenness is also provided at the sliding contact part with the inner circumferential wall of the hole of the main body when the knob rotates, and several places of the knurling-like unevenness are higher than other knurlings. A water flow regulator for electric water heaters with hot water supply function.