JP2586508Y2 - Reed switch drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device for a refrigerator, and more particularly, to a device for driving the switching of a reed switch by two magnets to detect the open / close state of the damper .

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Publication No. 3-28286, this type of reed switch driving device is applied to, for example, a damper device of a refrigerator, and has a motor. The transmission is reduced and transmitted to the final gear through a gear.

A plate cam is integrally formed with the gear, and a switch lever is pressed against the outer peripheral surface of the plate cam by a spring to contact the contour of the cam , that is, a lever type.
It has become a mosquito arm mechanism. A magnet is attached to the tip of the switch lever, and a reed switch is provided to face the magnet.

When the magnet approaches the reed switch, a pair of switch pieces in the reed switch come into contact with each other and turn on. When the magnet separates from the reed switch, the pair of switch pieces in the reed switch are turned on. It has a structure that turns off with elasticity.

[0005]

However, in the above reed switch driving device, the reed switch is switched from on to off by a structure in which the switch pieces are separated from each other by only a weak elastic force. So
If rocking such as freezing or soft stick occurs,
There has been a problem that the switch pieces cannot be separated from each other, resulting in a switch failure. Further, when the switch pieces are separated from each other, there is a problem that the switch piece bounces due to the cantilever support of the elastic body and chattering occurs. Further, the lever is urged to the cam side by a spring or the like.
The lever and cam during quick
The sound is generated by the sudden movement with. Sleep like a refrigerator
For those that are also used in rooms, etc.
The value may be lost.

[0006]

SUMMARY OF devised] The present invention has been made in view of the above problems, and an object, in the refrigerator of the damper device, eliminating the generation of the switch failure or the sound by rocking, it is possible to prevent the occurrence of chattering , And on and off
An object of the present invention is to provide a drive device for a reed switch that operates reliably .

[0007]

In order to achieve the above object, the present invention provides a driving source for driving a baffle for opening and closing a discharge port for cool air, and a driving force for reducing the driving force of the driving source to drive the baffle. A deceleration wheel train transmitted to the drive shaft, a rotating body that is driven to rotate in conjunction with the drive source, two switch pieces that can be brought into and separated from each other to detect the open / closed state of the baffle, and two leads that are integral with each switch piece In a damper device for a refrigerator comprising a reed switch having a single piece, a first reed switch having a first reed switch magnetized to a specific pole only.
Of the damper and the open / close position of the damper
Correspondingly, a second magnet provided with magnetic poles having different poles in the circumferential direction is provided, and the other lead piece and the second magnet are brought into close proximity to each other.

[0008]

The first switch piece is always magnetized to any polarity by the first magnet. In this state, when the rotating body rotates and the same magnetic pole as the first switch piece of the two magnetic poles of the second magnet approaches the second lead piece, the second switch piece becomes the first switch piece. The first and second switch pieces are separated from each other by magnetic repulsion of the same polarity, and the reed switch is turned off.

As described above, when the reed switch is turned off, a magnetic repulsive force acts on the switch pieces in addition to the elastic force, so that the switch pieces can be reliably separated from each other. Therefore, even if rocking such as icing or soft stick occurs on the switch piece, it is possible to eliminate a switch failure due to locking. In addition, when the reed switch is turned off, a magnetic repulsive force is applied to the switch piece in addition to the elastic force, so that chattering and noise can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a bottom view showing the drive device for the reed switch according to the embodiment covered with a gear case, FIG. 2 is a plan view showing the drive device for the reed switch covered with a case cover, and FIG. FIG. 4 is a plan view showing the device with the case cover removed, FIG. 4 is a developed cross-sectional view showing the drive device of the reed switch along the meshing line of the gear, and FIG. 5 is a cross-sectional view showing the magnet and the reed switch of FIG. is there.

The drive device for the reed switch is incorporated in a damper device 18 of a refrigerator, and has a motor 1 as a drive source.
The pinion 21 mounted on the motor shaft 20 of the motor 19 is integral with the rotor and meshes with the large-diameter teeth of the compound gear 22. The pinion 21, the compound gear 22, a compound gear 23 described later, and the like constitute a reduction gear train.

The small-diameter teeth of the compound gear 22 are
, And the small-diameter teeth of the compound gear 23 mesh with a gear 24, and for example, one chevron-shaped end face cam 25 is integrally formed with the gear 24. This end face cam 25
Then, a spindle 26 serving as a drive shaft of the baffle 39 is cam-engaged, and the spindle 26 has a structure in which the baffle 39 urged in the closing direction by the spring 38 of the damper device 18 is pushed open.

The drive device for the reed switch connects the first and second switch pieces 11 and 12 of the reed switch 27 to the first
The reed switch 2 is attracted or separated from each other by the magnetic attraction / repulsion of the first magnet 15 and the second magnet 16.
7 has a structure capable of performing on / off switching.

More specifically, the first reed switch 27 is inserted into a groove-shaped reed holding portion 29 formed at the bottom of the gear case 28.
The reed switch 27 is mounted by fitting and holding the second reed pieces 13 and 14. The reed switch 27 includes a glass tube 10, and first and second switch pieces 11 and 12 made of a magnetic material are provided in the glass tube 10 so as to extend in directions opposite to each other and to be capable of coming and going. I have.

The first and second switch pieces 11, 1
2 are opposed to each other so as to be overlapped at a predetermined interval, and lead pieces 13 and 14 of the same material connected to the outer ends of the switch pieces 11 and 12 project from the end of the glass tube 10 and have a right angle. , And is electrically connected to the printed board 30.

A first magnet 15 is provided in close proximity to the bent portion 31 of the first lead piece 13, for example, the magnetic pole N side is directed to the bent portion 31, and the first switch piece 11 always has a polarity. The structure is magnetized to N.

The gear 24 is engaged with the gear 24 at a gear ratio of 1: 1 so that the rotating body 17 formed by the gear is interlocked with the reduction gear train.
It is provided facing the second lead piece 14. The ring-shaped second magnet 16 is provided concentrically on the rotating body 17. The second magnet 16 includes a half-ring-shaped magnetic pole N and a semi-ring-shaped magnetic pole S connected to the semi-ring-shaped magnetic pole N at a central angle of 180 degrees. The second lead piece 14 has a structure in which the lead piece 14 is closely opposed to the bent portion 32.

It should be noted that 33, 34 are compound gears 22, 23.
Shafts 35 and 36 are gears 17 and 24, and these shafts 33 to 36 are supported by a gear case 28 and a case cover 37.

Next, the operation of this embodiment will be described. FIG. 6 is a time chart showing the switching operation of the reed switch 27.

The switch piece 11 is always magnetized to the polarity N by the magnet 15. The rotating body 17 under this state
When the magnetic pole N of the magnet 16 approaches the bent portion 32 of the lead piece 14 as shown in FIG.
Is magnetized to the polarity N, and the switch pieces 11 and 12 are separated from each other by magnetic repulsion of the same polarity.
7 is off.

When the magnetic pole S of the magnet 16 approaches the bent portion 32 of the lead piece 14 due to the rotation of the rotating body 17, the switch piece 12 is magnetized to the polarity S, and the switch pieces 11, 1
2 come closer to each other by magnetic attraction between different poles, and the reed switch 27 is turned on. In this way, the lead
Switch 27, following switched or from the switched
Hold on or off.

Thus, the reed switch 2 shown in FIG.
7 is obtained, and the baffle 39 is correspondingly pushed by the spindle 26 to open and close. When the on / off state of the reed switch 27 is
Since it corresponds to the closed state, the open / closed state of the baffle 39 can be determined from the signal level of the reed switch 27.

As described above, when the reed switch 27 is turned off, a magnetic repulsive force is applied to the switch pieces 11 and 12 in addition to the elastic force, so that the switch pieces 11 and 12 are turned off.
Can be reliably separated from each other.

Therefore, even when rocking such as icing or soft stick occurs, it is possible to eliminate switch failure due to locking. Also, reed switch 2
When the switch 7 is turned off, a magnetic repulsive force is applied to the switch pieces 11 and 12 in addition to the elastic force, so that chattering can be prevented from occurring.

Further, since a mechanically non-contact structure is used instead of the conventional cam engagement, not only can switching be performed silently, but also the motor torque can be effectively used for opening and closing the baffle 39. Opening / closing troubles due to freezing can be eliminated.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications are possible. For example, in the above-described embodiment, the case where the rotating body 17 is provided as a separate gear has been described. However, the present invention is not limited to this, and instead of the separate gear, the gear, pulley or cam in the reduction gear train is replaced with the rotating body. 17 and can be linked to the motor 19.

In the above-described embodiment, the case where the magnetic pole N of the first magnet 15 is made to approach the first lead piece 13 and the first switch piece 11 is always magnetized to the polarity N has been described. On the contrary, the magnetic pole S
And the first switch piece 11 can always be magnetized to the polarity S.

In this case, when the magnetic pole S approaches the second lead piece 14 due to the rotation of the rotating body 17, the reed switch 27 is turned off. The switch 27 is turned on.
Further, the second magnet 16 may be a multi-pole magnet that is alternately magnetized in the rotation direction.

[0029]

[Effects of the Invention] The present invention has the following specific effects. In other words, the switch pieces of the reed switch are configured to be switched off by using the magnetic force of the first magnet and the second magnet fixed to the rotating body to separate them from each other by magnetic repulsion. When switching off, a magnetic repulsive force is applied to the switch pieces in addition to the elastic force, so that the switch pieces can be reliably separated from each other.

Therefore, even if rocking such as icing or soft stick occurs, it is possible to eliminate switch failure due to locking. In addition, when the reed switch is switched off, a magnetic repulsive force is applied to the switch piece in addition to the elastic force, so that chattering can be prevented.

In particular, since one magnet for magnetizing the reed of the reed switch is fixed to the rotating body which rotates in conjunction with the driving source, the opening and closing operation of the baffle and the rotation for fixing the one magnet for magnetizing the reed are fixed. Since the rotating operation of the body is always synchronized and driven, there is no deviation between the open / closed state of the baffle and the timing at which the lead piece is turned on / off by the magnet fixed to the rotating body. like this
Since the rotating body rotates in conjunction with the drive source,
Synchronized with the opening and closing movement of the ruffle. For this reason, baffles
Opening and closing movement and the synchronization with the reed switch drive
Always secured. In addition, since the magnet is fixed to a rotating body that rotates in conjunction with a strong driving source that drives the baffle, it is unlikely that the rotating body will be poorly driven and stable switching is realized. can do.

In the conventional lever-type cam mechanism, the lever
Needs biasing means to bring bar into contact with cam profile
It is. The lever is urged toward the cam by a spring, etc.
The lever and the cam during quick
A sudden movement produces a sound. Bedroom like a refrigerator
For those that are used by anyone, the generation of this sound
The value may be lost. A spring or the like to suppress the generation of noise
If you weaken the biasing means, malfunction due to freezing will occur,
If you make the spring stronger, not only the sound problem, but also the spring
Therefore, since it is constantly slid on the cam,
Large torque is required, which leads to a large drive source.
As a refrigerator damper device, there is
You will not be able to meet short or small needs.

[0033] According to the present invention, a lever-type cam mechanism is used.
Switching without using springs
Because of the configuration, when used as a refrigerator,
All of the above problems can be solved and refrigerator damper devices
It is an excellent reed switch drive device.

[0034] Further, the cam lever is driven by the cam.
In such a case, a step is formed on the cam at the contour of the cam,
If it is not configured as having a different radius every 0 degrees,
Turn on the reed switch at the time of full open / close switch.
Or in the off state, and reset during the switching section.
Keeping the mode switch on or off
Can not.

[0035] On the other hand, in the present invention,
The difference of poles in the circumferential direction corresponding to the opening and closing of the baffle
Can be arranged in the circumferential direction.
No complicated processing like a cam is required, and the lead switch
Switch, switch on or
The off state can be maintained.

[0036] Furthermore, the second magnet is fixed to the rotating body
And is not fixed to the baffle. Accordingly
If the baffle freezes,
Move A rotating body and a switch operated by the rotating body
The tip is protected from the frozen part of the baffle.

[Brief description of the drawings]

FIG. 1 is a bottom view showing a drive device for a reed switch according to an embodiment in a state covered with a gear case.

FIG. 2 is a plan view showing a state in which the drive device for the reed switch is covered with a case cover.

FIG. 3 is a plan view showing the reed switch driving device with a case cover removed.

FIG. 4 is a developed cross-sectional view showing a drive device of the reed switch along a mesh line of a gear train.

FIG. 5 is a sectional view showing the magnet and the reed switch of FIG. 3 in a sectional view;

FIG. 6 is a time chart showing a switching operation of a reed switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Glass tube 11 1st switch piece 12 2nd switch piece 13 1st lead piece 14 2nd lead piece 15 1st magnet 16 2nd magnet 17 Rotating body 18 Damper device 19 Motor 20 Motor shaft 21 Pinion Reference Signs List 22 compound gear 23 compound gear 24 gear 25 end cam 26 spindle 27 lead switch 28 gear case 29 lead holding part 30 printed circuit board 31 bent part 32 bent part 33 axis 34 axis 35 axis 36 axis 37 case cover N magnetic pole S magnetic pole

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) H01H 36/00 F25D 17/00-17/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A cold air baffle for opening and closing the discharge port of the drive source for driving the baffle, reduction gear train for transmitting the drive shaft for driving the baffle decelerates the driving force of the driving source, to the drive source Used in a refrigerator damper device comprising a rotating body that is driven to rotate in conjunction with the same, two switch pieces that can be connected and disconnected to detect the open / closed state of the baffle, and a reed switch having two lead pieces integrated with each switch piece.
Is apparatus for driving a reed switch, a first magnet to magnetize only one specific pole lead piece of the reed switch is fixed to the rotating body, the
Position corresponding to baffle opening and corresponding to baffle closing
Use a second magnet positioned between the magnetic poles of different polarity in the circumferential direction are arranged is provided, the refrigerator damper apparatus is characterized in that is closely opposed and the other lead piece and said second magnet
Drive of the reed switch is needed.