JPH03626Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a switching device for a batshuuru, which is used for example in forced circulation electric refrigerators, show cases, car air conditioners, etc. The invention relates to a device for

(Prior Art) Conventionally, in this type of buttful opening/closing device, for example, in an electric refrigerator, the buttfull opening/closing device that opens and closes the duct that allows cold air to flow into the refrigerator is a mechanical device, an electromagnetic device, an electric device, etc. It has been known.

In the conventional mechanical opening/closing device for the valve, the temperature is set by adjusting the opening degree of the valve on the main body of the device that opens and closes the valve.
With this structure, the main body of the device and the operating section are located close to each other, making it difficult to operate when setting the temperature, and the mechanism also has the disadvantage that it cannot be controlled by a microcomputer, which has become increasingly popular in recent years.

In addition, the electromagnetic buttful opening/closing device has a structure in which a plunger is moved forward and backward by the operation of an electromagnetic coil, and the buttful, which is connected to the plunger via a lever, is opened and closed. However, depending on the position of the plunger, the buttful can be set to only two states, a closed state and a constant opening, and the opening of the buttful cannot be adjusted.

(Problems to be solved by the invention) In order to solve the problems of the above-mentioned mechanical and electromagnetic type double switchgears, an electric double switchgear using a stepping motor was proposed. Since it uses

In addition, in a device that opens and closes the baffle using a DC motor using brushes, the motor is locked when the buffle is in the closed position. If a difference occurs and the motor is energized in a locked state, the life of the motor will be significantly shortened.

The present invention was developed in view of the above-mentioned problems, and it is possible to continuously adjust the opening degree of the buttful that opens and closes the duct, and also to adjust the opening degree of the buttfull to accurately adjust the temperature of a refrigerator, for example. To provide a simple and inexpensive opening/closing device for a baffle, which can perform control, prevent the motor from being energized without locking the motor at the closed position of the baffle, and has a simple configuration.

[Structure of the idea]

(Means for solving the problem) The buttful opening/closing device of the present invention includes a buttful that approaches and separates from the open end of a duct to open and close the open end of the duct, and this buttful rotatably connected to one end side. and a lever that rotatably supports the other end on a fixed part and opens or closes the buttful at a predetermined opening degree depending on the amount of rotation, and a worm wheel that is rotated by a motor via a worm. a drive shaft that is screwed onto the worm wheel, is engaged with the lever, moves forward and backward as the worm wheel rotates, and rotates the lever by a predetermined amount in accordance with the amount of movement; and a reed switch attached to the fixed part; The reed switch is actuated by a fixed magnet, and the lever is provided with a shielding plate that blocks or releases the magnetic field from the fixed magnet to the reed switch by movement based on the rotation of the lever, and the lever is provided with a shield plate that blocks or releases the magnetic field from the fixed magnet to the reed switch, The present invention is characterized in that the opening degree of the baffle is continuously changed by the movement of the baffle, and that it is detected that the baffle is in the closed position by opening the reed switch.

(Function) The Batsuful opening/closing device of the present invention uses a motor to rotate a worm wheel via a worm.
The drive shaft screwed to this worm wheel is moved forward and backward, and the lever engaged with this drive shaft is rotated, and the buttful provided at one end of this lever is used to adjust the closing operation or the amount of movement of the drive shaft. By opening the lever at a predetermined opening degree, for example, the temperature inside the refrigerator can be adjusted by opening or closing a duct that allows cold air to flow into the refrigerator. The movement of the reed switch blocks or opens the magnetic field of the magnet to the reed switch, and when the reed switch is opened, the reed switch forms a closed circuit, and when the lever is rotated beyond the closed position of the reed switch, the shield plate is closed. The magnetic field of the fixed magnet is cut off, the reed switch is opened, and the reed switch detects the closed position of the buffer using a microcomputer, for example, and the energization of the motor is controlled.

(Embodiment) The structure of an embodiment of the switch-on-closing device of the present invention will be described with reference to FIGS. 1 and 2.

The Batsuful opening/closing device of this embodiment is used in a forced circulation electric refrigerator, and controls the temperature inside the refrigerator by opening and closing the opening end 1a of the duct 1 that allows cold air to flow into the refrigerator. .

Reference numeral 2 denotes a main body serving as a fixing portion, which is composed of a box-shaped case body 3 with one side open and a cover body 4 that closes the open side of the case body 3.

Reference numeral 5 denotes a plate-shaped baffle for opening and closing the opening end 1a of the duct 1. One end of a plate-shaped lever 6 is rotatably attached to this buffle 5 by a support shaft 7. The other end is rotatably attached to a protrusion 3a protruding toward the outer surface of the main body 2 via a support shaft 8. Furthermore, a substantially spherical recess 6a is formed in the center of the lever 6, as shown in FIG. Further, both ends of a spring 9 are engaged with the buttful 5 and the lever 6, respectively, and the spring 9 causes one end of the buttful 5 (lower part in the figure) to be connected to the duct 1 with respect to the lever 6. It is biased toward the side.

Further, a reversible motor 10 that rotates in both forward and reverse directions is provided within the main body 2, and a worm 11 is fixed to a rotating shaft 10a of this motor 10. Furthermore, a worm wheel 12 that meshes with the worm 11 is provided. This worm wheel 12 is molded from thermoplastic synthetic resin, and as shown in FIG. This internal threaded portion 14
As shown in FIG. 5, a notch 15 is formed to divide the plate into three parts. The worm wheel 12 also includes an engagement stepped portion 16 on the outer periphery of the cylindrical shaft support 13, which is engaged with the inner surfaces of the case body 3 and the cover body 4 so that the inner surfaces of the case body 3 and the cover body 4 are rotated smoothly. 17 is formed in an annular shape. The rotation of the motor 10 is
The deceleration is transmitted to the worm wheel 12 via the worm 11.

Further, a drive shaft 21 is screwed into the female threaded portion 14 of the shaft support 13 of the worm wheel 12 so as to be movable forward and backward. Further, a spherical portion 20 is provided at the tip of the drive shaft 21, and this spherical portion 20 is rotatably engaged with the recess 6a of the lever 6. Furthermore, by forming the anti-rotation protrusion 26 on the spherical portion 20 of the drive shaft 21, the buff full lever 6 can be operated smoothly.

Further, a permanent magnet 22 is located near the worm wheel 12 and is fixed to the inner surface of the cover body 4.
A reed switch 23 is provided on the inner surface of the cover body 4 so as to face the permanent magnet 2 with a small gap therebetween. .

Further, 24 is a shielding plate, which is provided on the lever 6, and this shielding plate 24 is connected to the duct 1 when the buffer 5 is connected.
When the opening end of the reed switch 23 is closed, the reed switch 23 is interposed between the permanent magnet 22 and the reed switch 23, and the magnetic field of the permanent magnet 22 is shielded from the reed switch 23. And this shielding plate 24
is inserted into a groove 25 formed in the lever 6 so as to be able to move forward and backward, and connects the permanent magnet 22 and the reed switch 2.
The amount of protrusion between 3 and 3 can be adjusted.

Next, the operation of this embodiment will be explained.

Based on the temperature inside the refrigerator detected by a sensor (not shown), a control unit such as a microcomputer calculates the opening degree of the blower 5 and rotates the motor 10 by a predetermined amount in a predetermined direction. As the motor 10 rotates, the worm wheel 12 that meshes with the worm 11 rotates. Further, as the worm wheel 12 rotates, the drive shaft 21 moves, and the lever 6, in which the spherical portion 20 of the drive shaft 21 is engaged with the recess 6a, rotates about the support shaft 8. When the lever 6 rotates, the lever 6 is biased by the spring 9, and the buttful 5 rotates around the support shaft 7 with one end of the main body 2 in contact with the duct 1, and the duct 1 is rotated. The opening end 1a is opened at a predetermined opening degree.

At this time, the degree of opening of the baffle 5, that is, the angle between the buffle 5 and the open end 1a of the duct 1, is determined depending on the position of the drive shaft 21. That is, when the drive shaft 21 is retreating into the main body 2, the baffle 5 closes the open end 1a of the duct 1, and when the drive shaft 21 advances from the main body 2 from that position, the buff full 5 opens. Further, since the amount of movement of the drive shaft 21 is determined according to the rotation speed of the worm wheel 12, the opening degree of the brush 5 is ultimately determined according to the rotation speed of the motor 10 controlled by a microcomputer.

When the exhaust 5 is opened, cold air flows into the refrigerator through the opened duct 1, and the temperature inside the refrigerator decreases. At this time, the larger the opening degree of the baffle 5, the larger the amount of cold air flowing in, so that cooling is performed more quickly. In this way, the temperature inside the refrigerator can be accurately controlled by closing the baffle 5 or opening it at a predetermined opening degree.

Further, when the lever 6 rotates, the shielding plate 24 provided on the lever 6 is interposed between the permanent magnet 22 and the reed switch 23 or separated, so that the reed switch 23 opens and closes. This open/close signal of the reed switch 23 is sent to the microcomputer. As a result, the opening/closing of the buttful 5 is detected, and the microcomputer controls the motor 1 so that the opening degree of the buttful 5 is appropriate.
Controls 0. When the buffer 5 moves from the open end of the duct 1 to the closing direction, the reed switch 23 forms a closed circuit, and the motor 10 is energized via the reed switch 23. 1, the motor 10 rotates a little, and the shielding plate 24 provided on the lever 6 is interposed between the reed switch 23 and the permanent magnet 22 to block the magnetic field of the permanent magnet 22. However, the reed switch 23 is opened, power to the motor 10 is cut off, and the motor 10 is stopped. Further, when the baffle 5 opens the duct 1, the motor 10 rotates regardless of whether the reed switch 23 is opened or closed, and the buffle 5 opens to a predetermined set amount by rotating for a set time.

Note that the drive shaft 21 is designed to rotate idly by a certain amount of rotation.

Moreover, since the opening degree of the baffle 5 is controlled by such a configuration, the motor 10 may be an inexpensive direct current type general-purpose reversible motor.

Further, in the above embodiment, the female threaded portion 14 formed on the shaft support 13 of the worm wheel 12 has a notch 15.
Since the worm wheel 12 or the drive shaft 21 can be easily assembled without rotating the worm wheel 12 or the drive shaft 21, the worm wheel 12 or the drive shaft 21 can be easily assembled.

In addition, in the above embodiment, the drive shaft 21
A configuration has been described in which the degree of opening of the lever 5 increases as the lever advances from the main body 2.
may be provided, so that the further the drive shaft 21 retreats into the main body 2, the greater the opening degree of the buttful 5 may be.

(Effect of the invention) According to the invention, a drive shaft is screwed to the worm wheel which is rotated by a motor via a worm so that it can move forward and backward, and the shaft is rotatably attached to a lever that is engaged with the drive shaft. A closed door is provided, and the door is opened and closed by rotating it by an amount corresponding to the amount of movement of the drive shaft, and the degree of opening of the door is continuously changed depending on, for example, the temperature inside the refrigerator. It is possible,
Moreover, the combination of a worm and a worm wheel allows for a larger reduction ratio compared to a combination of spur gears, and reduces the number of parts.In the closed position of the buttful, the permanent magnet installed in the fixed part and the magnetic field of this permanent magnet open and close. A reed switch is provided, and a shielding plate is provided to open or cut off the magnetic field of this reed switch, and this shielding plate blocks the magnetic field of the permanent magnet from the reed switch in the fully closed position. , it is possible to reliably detect when the baffle is closed, and by arbitrarily adjusting the opening degree of the baffle, the opening degree of the baffle can be accurately controlled.For example, the motor can be locked when the baffle is closed. Eliminate such things,
The life of the motor is not shortened, and the motor may be a direct current type general-purpose reversible motor, which has a simple structure and can be obtained at low cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the opening/closing device for a buttful according to the present invention, Fig. 2 is a front view of the same as above, Fig. 3 is a longitudinal cross-sectional view of the same as the above-lined part, and Fig. 4 is the same as the above-.
FIG. 5, which is a longitudinal sectional view of the line portion, is an explanatory plan view of the same. 1... Duct, 1a... Open end of duct 1, 2
...Main body serving as a fixed part, 5... Batsuful, 6...
Lever, 10... Motor, 11... Worm, 2
1... Drive shaft, 22... Permanent magnet, 2
3... Reed switch, 24... Shielding plate.

Claims (1)

[Claim for Utility Model Registration] A buttful that approaches and separates from the open end of the duct to open and close the open end of the duct, and this buttful is rotatably connected to one end and the other end is rotatably attached to a fixed part. a lever that is supported by and opens or closes the buttful at a predetermined opening degree depending on the amount of rotation;
A worm wheel is screwed to a worm wheel rotated by a motor via a worm so that it can move forward and backward, and is engaged with the lever so that it moves forward and backward as the worm wheel rotates and rotates the lever by a predetermined amount in accordance with the amount of movement. a reed switch provided on a fixed part, and a fixed magnet provided on the fixed part to operate the reed switch, and the reed switch is moved by movement based on rotation of the lever to actuate the reed switch in the magnetic field from the fixed magnet. The lever is provided with a shielding plate that opens and closes the reed switch by cutting off or opening the reed switch, and the rotation of the motor continuously changes the opening degree of the buttful, and the opening of the reed switch brings the buttfull to the closed position. Batsuful's opening/closing device is characterized by the ability to detect certain things.