JPH0310449Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a switching device for opening/closing a valve used in forced circulation electric refrigerators, show cases, car air conditioners, etc. This invention relates to a device that opens and closes the door.

(Prior Art) For example, electric refrigerators are equipped with a double opening/closing device that opens and closes a duct that allows cold air to flow into the refrigerator in order to control the temperature inside the refrigerator. Conventionally, mechanical devices, electromagnetic devices, devices using stepping motors, etc. are known.

(Problems to be solved by the invention) In the above-mentioned conventional mechanical device, the main body of the device that opens and closes the valve is provided with an operation part for setting the temperature by adjusting the opening degree of the valve. However, because the main body of the device and the operating section are located close to each other, it is difficult to operate when setting the temperature, and due to the mechanism, it cannot be controlled by the microcomputer that has been increasingly adopted in recent years. .

Electromagnetic devices were developed to overcome the drawbacks of mechanical devices. For example, electromagnetic coils are operated to move the plunger forward and backward, and the plunger is then moved through a lever. Although the structure is such that the connected buttfuls can be opened and closed, the operation of the device produces unpleasant noises.
Further, depending on the position of the plunger, the baffle can be set to only two states, a closed state and an open state with a constant opening, and there is a problem that the opening of the baffle cannot be adjusted.

A device using a stepping motor was proposed to eliminate the drawbacks of the mechanical and electromagnetic devices mentioned above, but because it uses a stepping motor, it is extremely expensive. There was a problem.

The purpose of this invention is to be able to continuously adjust the opening degree of the full opening for opening and closing the duct, and to
For example, an object of the present invention is to obtain an inexpensive opening/closing device for a baffle that can accurately control the opening degree of the baffle in order to accurately adjust the temperature inside a refrigerator.

[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 whose other end is rotatably supported on a fixed part and which opens or closes the buttful at a predetermined opening degree depending on the amount of rotation; and a worm wheel which is rotated by a motor via a worm;
a drive shaft that is screwed to the worm wheel so as to be movable forward and backward, is engaged with the lever, moves forward and backward as the screw rotates, and rotates the lever by a predetermined amount in accordance with the amount of movement;
a permanent magnet provided on the worm wheel;
It is equipped with a reed switch that opens and closes when a permanent magnet approaches or separates as the worm wheel rotates, and the rotation of the motor continuously changes the opening degree of the buttful, and the opening and closing of the reed switch causes the worm wheel to rotate. The invention is characterized in that the opening degree of the baffle is controlled by detecting the number of openings.

(Function) The opening/closing device of the present invention uses a motor to rotate a worm wheel via a worm, move a drive shaft screwed to the worm wheel forward and backward, and push a lever engaged with the drive shaft. By rotating the lever and opening the buttful provided at one end of the lever at a predetermined opening depending on the amount of movement of the drive shaft, for example, a duct for introducing cold air into a refrigerator can be opened. The worm wheel opens and closes to adjust the temperature inside the refrigerator, and the permanent magnet provided on the worm wheel approaches or moves away from the reed switch as the gear rotates, opening and closing the reed switch. A microcomputer connected to this reed switch detects the number of revolutions of the worm wheel, and controls the opening of the baffle by controlling a motor or the like.

(Embodiment) The structure of an embodiment of the switch-full opening/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, 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 buttful for opening and closing the opening end 1a of the duct 1. One end of a long and thin plate-shaped lever 6 is rotatably attached to this buffle 5 by a support shaft 7. The other end of 6 is connected to the main body 2
It is rotatably attached by a support shaft 8 to a protrusion 3a which protrudes to the outside surface side and serves as a fixed part. 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.
Therefore, with respect to the lever 6, the Batsuful 5 is
One end side (lower part in the figure) is biased toward the duct 1 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. The worm wheel 12 is molded from thermoplastic synthetic resin, and as shown in FIG. 3, a cylindrical shaft 13 is formed at the center, and a female thread 14 is formed on the inner periphery of the shaft 13. , this female threaded portion 14
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 cover body 4 so that the inner surfaces of the case body 3 and the cover body 4 can be smoothly rotated. 17 is formed in an annular shape. The rotation of the motor 10 is decelerated and 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 24 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 provided on the peripheral edge of the worm wheel 12, and a permanent magnet 22 is provided at the peripheral edge of the worm wheel 12.
Inside, at a position facing the permanent magnet 22 with a small gap, there is a reed switch 23 that opens and closes as the permanent magnet 22 approaches and leaves.
is provided.

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. Then, as the motor 10 rotates, the worm 11
The worm wheel 12 that meshes with 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 buttful 5, which is biased by the spring 9 against the lever 6,
It rotates around the support shaft 7 with one end edge on the main body 2 side in contact with the duct 1, and the open end 1 of the duct 1
Open a to 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, as shown in FIG.
As the drive shaft 21 approaches the main body 2 side from that position, the baffle 5 opens with a larger opening degree. 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 buffle 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.

Also, when the worm wheel 12 rotates, the permanent magnet 2 provided on the worm wheel 12
2 approaches or moves away from the reed switch 23, the reed switch 23 opens and closes. The opening/closing signal of the reed switch 23 is sent to a microcomputer, and the rotational speed of the worm wheel 12 is detected based on the signal. As a result, the position of the drive shaft 21 and the opening degree of the baffle 5 are accurately detected, and based on this, the microcomputer controls the motor 10 so that the opening degree of the buffle 5 is appropriate.

In addition, since the opening degree of the baffle 5 is controlled by such a mechanism, 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.

Further, since the worm wheel 12 is molded from thermoplastic synthetic resin, the permanent magnet 22 can be easily incorporated, the number of steps can be reduced, and the worm wheel 12 can be assembled compactly.

In addition, in the above embodiment, the drive shaft 21
A configuration has been described in which the degree of opening of the full 5 increases as it approaches the main body 2.However, unlike the device of the above embodiment, a lever 6 is provided on the opposite side of the main body 2, and the drive shaft 21 is moved away from the main body 2. The opening degree of the full 5 may be made larger as the temperature increases.

[Effect of idea]

According to the present invention, a drive shaft is screwed to a worm wheel that is rotated by a motor via a worm so that it can move forward and backward, and a lever that is engaged with this drive shaft and a shaft that is rotatably attached to this lever. Since the opening and closing operation of the buttful is made by rotating the buttful by an amount corresponding to the amount of movement of the drive shaft, for example, the opening degree of the buttful can be continuously changed depending on the temperature inside the refrigerator. Moreover, the combination of the worm and the worm wheel allows for a larger reduction ratio compared to the combination of spur gears, and the number of parts can be reduced.In addition, the worm wheel is provided with a permanent magnet, and the rotation of the main body is A reed switch is installed that opens and closes when the permanent magnet approaches or moves away from the magnet.
Since the rotation speed of the worm wheel can be detected, the opening degree of the buttful can be accurately controlled by arbitrarily adjusting the opening degree of the buttful. Since the temperature is controlled, the motor can be a direct current general-purpose reversible motor or the like, making it possible to provide an inexpensive switching device.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the switch-full opening/closing device of the present invention, Fig. 2 is a longitudinal sectional front view of the same, and Fig. 3
The figure is a longitudinal sectional view of the worm wheel, FIG. 4 is a side view of the drive shaft section, and FIG. 5 is a side view of the baffle in the closed state. 1... Duct, 1a... Open end of duct 1, 3
a...Protrusion serving as a fixed part, 5...Batsuful, 6...
... lever, 10 ... motor, 11 ... worm, 21 ... drive shaft, 22 ... permanent magnet, 23 ... reed switch.

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 the lever and opens or closes the buttful at a predetermined opening degree depending on the amount of rotation; a worm wheel that is rotated by a motor via the worm; a drive shaft that is engaged with the lever and moves forward and backward as the worm wheel rotates, and rotates the lever by a predetermined amount according to the amount of movement; a permanent magnet provided on the worm wheel; It is equipped with a reed switch that opens and closes when a permanent magnet approaches or separates as it rotates, and the rotation of the motor continuously changes the opening degree of the buffer, and the rotation speed of the worm wheel is detected by opening and closing the reed switch. An opening/closing device for a buttful, characterized in that the opening degree of the butthole is controlled by the button.