CN106642909B - Refrigerators & Freezer Storage Boxes - Google Patents

Abstract

The invention provides a refrigerator and a refrigerator storage box. Wherein, the refrigerator storage box includes a box body with a forward opening, a refrigerator drawer that is arranged in the box body and can be drawn out through the forward opening, and an induction device for sensing the opening and closing of the refrigerator drawer. The induction device includes: a magnet, arranged in the refrigerator On the drawer: the Hall switch element is arranged on the box body and is configured to generate a corresponding open signal or close signal of the refrigerator drawer by inducing the change of the magnetic field of the magnet. In addition, the present invention also provides a refrigerator with the refrigerator storage box. The invention can realize the intelligent monitoring of the opening and closing of the storage box of the refrigerator by utilizing the Hall switch element.

Description

Refrigerators & Freezer Storage Boxes

technical field

The invention relates to the field of refrigerated and frozen storage, in particular to a refrigerator and a refrigerator storage box.

Background technique

In recent years, with the improvement of people's living standards, the demand for food preservation has generally increased. This requires that the storage compartment of the refrigerator, especially the refrigerator drawer, has good airtightness, so that the food has a longer fresh-keeping time and better taste. Especially refrigerators with nitrogen fresh-keeping function have higher requirements on the sealing of nitrogen fresh-keeping containers. If the refrigerator drawer is opened, it will cause nitrogen leakage. If the leakage is too large, the freshness preservation performance will be reduced. When to replenish nitrogen in the refrigerator drawer is an urgent problem in this field.

In addition, the current refrigerator drawers generally do not have a locking device, which may not be completely sealed after the refrigerator drawer is returned; and the unevenness of the refrigerator drawer in the process of pushing and pulling may affect the airtightness of the storage box; especially for those with nitrogen fresh-keeping containers For refrigerators, frequent opening due to mistakes will reduce the proportion of nitrogen in the container, causing the influx of outside air, which greatly reduces the fresh-keeping performance of nitrogen fresh-keeping refrigerators. Therefore, there is an urgent need for a refrigerator drawer that has a locking function and can effectively prevent frequent openings caused by mistakes.

Contents of the invention

In view of the above problems, the present invention designs a refrigerator storage box that has a locking function and can use nitrogen to keep fresh. It can use the handle to move up and down to realize the locking and/or unlocking of the refrigerator storage box. Nitrogen gas is injected into the food box to keep the food fresh. However, the designer discovered during the design process that opening the refrigerator drawer will cause the nitrogen in it to leak, and it is necessary to continuously replenish nitrogen into the refrigerator storage box to maintain the nitrogen content. However, if the nitrogen is injected too frequently, it will cause waste of nitrogen. A long interval will make the nitrogen supply in the storage box of the refrigerator unable to keep up, affecting the freshness preservation performance. Therefore, there is an urgent need for a refrigerator drawer whose opening and closing state can be monitored so that the refrigerator can intelligently replenish nitrogen.

In particular, the present invention provides a storage box for a refrigerator, which includes a box body with a front opening, a refrigerator drawer disposed in the box body and capable of being drawn out through the front opening, and a storage box for sensing the opening of the refrigerator drawer. A closed sensing device, wherein the sensing device includes:

a magnet arranged on the refrigerator drawer;

The Hall switch element is arranged on the box body and is configured to generate a corresponding open signal or close signal of the refrigerator drawer by sensing the change of the magnetic field of the magnet.

Optionally, the refrigerator storage box further includes: a locking assembly for locking the refrigerator drawer on the box body, and the locking assembly includes: a pivoting lock, rotatably installed on the refrigerator drawer, It is configured to rotate in one direction under the action of force when the refrigerator drawer enters the box body or after it enters the box body, and cooperates with the fastening part provided on the box body; the locking device , installed on the refrigerator drawer, configured to prevent the pivoting lock from rotating in the other direction opposite to the one direction after the pivoting lock is engaged with the buckling portion, so that the The pivoting lock is kept in a mating state with the fastening portion, so as to lock the refrigerator drawer to the box body.

Optionally, the number of the pivoting locks is two, and each of the pivoting locks includes an abutting portion and a locking portion that cooperates with the buckling portion, and the rotation axis of the pivoting locks is located at Between the engaging part and the abutting part; moreover, there are two buckling parts, and when the two pivoting locks cooperate with the corresponding buckling parts, the rotation directions are opposite The locking device includes a handle, which has a handle portion, and two lever portions arranged at both ends of the handle portion, and the handle is slidably mounted on the The refrigerator drawer is configured to move to a preset position after each of the pivoting locks is engaged with the corresponding engaging portion so that one end of each of the abutting rods is aligned with one of the abutting portions The side facing the other said abutting part is contacted and abutted, so that the relative position between each said pivoting latch and said refrigerator drawer remains unchanged.

Optionally, the locking device further includes: two guide rods, each of the guide rods extends vertically and is fixed to the handle, and each of the guide rods is slidably mounted on the refrigerator drawer and two sliders, each of which is fixed to the handle and vertically slidably mounted to the refrigerator drawer.

Optionally, the two pivoting locks are arranged on both sides of the front end of the refrigerator drawer, and the rotation axis of each of the pivoting locks extends along the vertical direction.

Optionally, the locking device further includes: two sets of sliding tracks, each set of sliding tracks has a first sliding groove, a second sliding groove, a third sliding groove along a direction parallel to the rotation axis of the pivotal lock. a chute and a fourth chute; each of the guide rods is mounted on the first chute and the second chute of a set of the chute, and the first chute and the second chute are located The front and rear sides of the guide rod; each of the sliders is installed on the third chute and the fourth chute of a set of slideways, and the third chute and the fourth chute are located at the Horizontal sides of the slider.

Optionally, the Hall switch element is arranged on the upper part of a side wall of the box body, and the magnet is arranged at the front end of the refrigerator drawer.

Optionally, the refrigerator drawer includes: a drawer body, which has a bottom plate, two side plates, a rear plate and a front mounting plate, and the two side edges of the front mounting plate are located on the outer sides of the two side plates; The cover, on which an operation opening is opened, is installed on the front side of the front mounting plate, and defines an accommodating cavity with the front mounting plate; the locking device and the magnet are arranged in the accommodating cavity.

In particular, the present invention also provides a refrigerator, comprising:

a cabinet defining a storage space therein; and

According to any one of the above refrigerator storage boxes, the box body of the refrigerator storage box is arranged at the lower part of the storage space.

Optionally, the refrigerator further includes: a nitrogen generator configured to inject nitrogen gas into the box in a controlled manner; a controller electrically connected to the Hall switch element to The refrigerator drawer opening signal and the refrigerator drawer closing signal determine the opening and closing state of the refrigerator drawer or the number of opening and closing times of the refrigerator drawer, and control the The start and stop of the nitrogen generator.

Because the refrigerator storage box of the present invention includes an induction device for sensing the opening and closing of the refrigerator drawer, the induction device includes a magnet and a Hall switch element, and is configured to generate a corresponding opening signal or a closing signal of the refrigerator drawer by inducing a change in the magnetic field of the magnet. , in order to realize the intelligent monitoring of the opening and closing of the storage box of the refrigerator.

Further, because the refrigerator storage box also includes a locking component, which can lock the refrigerator drawer to the box body, it is possible to avoid opening the refrigerator storage box due to mistakes as much as possible, and improve the freshness preservation performance of the refrigerator storage box.

Because the refrigerator of the present invention includes a nitrogen-generating device and a controller, the controller can determine the opening and closing state of the refrigerator drawer or the number of times of opening and closing of the refrigerator drawer according to the refrigerator drawer opening signal and the refrigerator drawer closing signal generated by the Hall switch element. The opening and closing state of the refrigerator drawer or the opening and closing times of the refrigerator drawer control the start and stop of the nitrogen generator, thereby ensuring the nitrogen content in the refrigerator storage box to improve the freshness preservation performance of the refrigerator storage box.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic exploded view of a refrigerator storage box according to an embodiment of the present invention;

Fig. 2 is a schematic partial front view of a refrigerator storage box according to an embodiment of the present invention;

Fig. 3 is a schematic side view of a refrigerator storage box according to an embodiment of the present invention;

Fig. 4 is a schematic partial top view of a refrigerator storage box according to an embodiment of the present invention;

Fig. 5 is a partial enlarged view of place A shown in Fig. 4;

Fig. 6 is another partial enlarged view of place A described in Fig. 4;

Fig. 7 is a schematic partial side view of a refrigerator storage box according to an embodiment of the present invention;

Fig. 8 is another schematic partial side view of a refrigerator storage box according to an embodiment of the present invention;

Fig. 9 is another schematic partial top view of a refrigerator storage box according to an embodiment of the present invention; and

FIG. 10 is a schematic partial enlarged view of point B shown in FIG. 9 .

Detailed ways

Fig. 1 is a schematic exploded view of a refrigerator storage box according to an embodiment of the present invention, Fig. 2 is a schematic partial front view of a refrigerator storage box according to an embodiment of the present invention, and Fig. 3 is a schematic partial front view of a refrigerator storage box according to an embodiment of the present invention Schematic side view of a refrigerator storage box. As shown in FIG. 1 to FIG. 3 , an embodiment of the present invention provides a refrigerator storage box 10, which may include a box body 100 with a front opening, and a refrigerator set in the box body 100 that can be drawn out through the front opening. The drawer 200 is used to hold the stored goods through the refrigerator drawer 200, and then seal the stored goods in the box body 100, so as to realize the preservation of the stored goods. In particular, the refrigerator storage box 10 further includes a sensing device 300 for sensing the opening and closing of the refrigerator drawer 200 . The sensing device 300 may include a magnet 310 and a Hall switching element 320 . The magnet 310 can be arranged on the refrigerator drawer 200, and the Hall switch element 320 can be arranged on the box body 100, and is configured to generate a corresponding opening signal or closing signal of the refrigerator drawer 200 by inducing the change of the magnetic field of the magnet 310, so as to realize refrigerator storage. Intelligent monitoring of the opening and closing of the box 10. For example, when the refrigerator drawer 200 is pulled out to a preset position, the magnetic field strength signal of the magnet 310 sensed by the Hall switch element 320 serves as an opening signal of the refrigerator drawer 200 .

Fig. 4 is a schematic partial top view of a refrigerator storage box 10 according to an embodiment of the present invention, Fig. 7 is a schematic partial side view of a refrigerator storage box 10 according to an embodiment of the present invention, and Fig. 8 is a schematic partial side view of a refrigerator storage box 10 according to an embodiment of the present invention. Another schematic partial side view of a refrigerator storage box 10 according to an embodiment of the invention. As shown in FIG. 4 to FIG. 8 , in some embodiments of the present invention, the refrigerator storage box 10 may further include a locking component 400 for locking the refrigerator drawer 200 to the box body 100 . The locking assembly 400 may include a pivoting catch 410 and a locking device 420 . Wherein, the pivoting lock 410 is rotatably installed on the refrigerator drawer 200, and is configured to rotate in one direction under the action of an active force when the refrigerator drawer 200 enters the box body 100 or after entering the box body, and is consistent with the setting Matches with the fastening portion 110 on the box body 100 . The locking device 420 can be installed on the refrigerator drawer 200, and is configured to prevent the pivoting lock 410 from rotating in the opposite direction to one direction after the pivoting lock 410 is engaged with the fastening portion 110, so that the pivoting lock 410 Keep in a mating state with the buckle part 110 , so as to lock the refrigerator drawer 200 to the box body 100 . Further, the locking device 420 can also be configured to act under the action of an active force to release the resistance to the rotation of the pivoting lock 410 in another direction, so as to allow the pivoting lock 410 to rotate in another direction, so as to be able to The refrigerator drawer 200 is allowed to be pulled out from the box body 100 , so as to realize the unlocking of the refrigerator drawer 200 .

In some embodiments of the present invention, the number of pivoting locks 410 can be two, the rotation axes of the two pivoting locks 410 can be parallel to each other, and the number of buckling parts 110 is two, and the two pivoting When the locking buckles 410 are mated with the respective buckling parts 110 , the rotation directions are opposite. Further, the locking device 420 may include an abutment, and the abutment may be slidably mounted on the refrigerator drawer 200 along a direction parallel to the rotation axis of the pivoting lock 410, so that each pivoting lock 410 is aligned with its corresponding After the fastening portion 110 is engaged, it moves to a preset position and abuts against the two pivoting locks 410 so that the relative position between each pivoting lock 410 and the refrigerator drawer 200 remains unchanged. That is to say, the locking device 420 can be made to lean against the two pivoting locks 410, so that the two pivoting locks 410 cannot rotate, and then maintain the state of matching with the two buckling parts 110, so as to realize the lock and lock of the refrigerator drawer 200. Locking: the locking device 420 is controllably detached from the preset position, so that it no longer abuts against the two pivoting locks 410, and the rotation of the two pivoting locks 410 cannot be prevented, so that the refrigerator drawer 200 can be locked. unlock.

Further, each pivoting lock 410 may include an abutting portion 411 abutting against the locking device 420 and a locking portion 412 cooperating with the buckling portion 110 , and the rotation axis of the pivoting locking 410 may be located at the locking position. Between the part 412 and the abutting part 411. For example, the abutting portion 411 is located at the front of each pivoting lock 410 , the engaging portion 412 is located at the rear of each pivoting locking 410 , and the axis of rotation is located between the abutting portion 411 and the latch of each pivoting locking 410 . Between the joint parts 412 , such arrangement can make the joint part 412 and the abutment part 411 have a larger rotation distance during rotation, so as to facilitate the engagement of the joint part 412 and the locking of the abutment part 411 .

Further, the locking device 420 can be a handle. The handle can have a handle portion 421, and two abutting rod portions 422 disposed at both ends of the handle portion 421, and at a preset position, one end of each abutting rod portion 422 is connected to one abutting portion 411 toward the other abutting portion 411 side contact against. In some embodiments, the handle part 421 is arranged horizontally, and the two abutting rod parts 422 can extend horizontally from both ends of the handle part 421, so as to be located between the two abutting parts 411 at the preset position, that is, each abutting part The rod portion 422 is located inside the corresponding abutting portion 411 to abut against it. In this embodiment, the engaging portion 412 of each pivoting lock 410 is rotated from outside to inside for locking, and the abutting portion 411 of each pivoting lock 410 is rotated from outside to inside to unlock. In some other embodiments, each rod-resisting portion 422 may extend upwards or downwards from one end of the handle portion 421 , or extend horizontally from one end of the handle portion 421 and then extend upwards or downwards to form a hook, and The rotation axis of the pivotal lock 410 is located between the two hooks. At the preset position, each hook is located outside the abutting portion 411 of the corresponding pivoting lock 410 , and the inner surface of the hook is in contact with the outer surface of the engaging portion 412 . In this embodiment, the engaging portion 412 of each pivoting lock 410 is rotated from inside to outside for locking, and the abutting portion 411 of each pivoting lock 410 is rotated from inside to outside to unlock.

Fig. 9 is another schematic partial top view of a refrigerator storage box according to an embodiment of the present invention. As shown in FIG. 9 and FIG. 10 , in some embodiments of the present invention, the locking device 420 may include a handle part 421 , two guide rods 423 and two sliders 424 . Wherein, each guide rod 423 can extend vertically and be fixed on the handle part 421 , and each guide rod 423 can be slidably installed on the refrigerator drawer 200 . Each sliding block 424 can be fixed on the rod portion 422 and slidably mounted on the refrigerator drawer 200 along the vertical direction.

Further, two pivoting locks 410 can be arranged on both sides of the front end of the refrigerator drawer 200, and the rotation axis of each pivoting lock 410 extends along the vertical direction, so that each pivoting lock 410 can move along the The horizontal direction is buckled on the buckling portion 110 to improve the stability of the pivoting lock 410 after locking.

In some embodiments of the present invention, the locking device may further include two sets of slideways, and each set of slideways may have a first sliding groove, a second sliding groove, a second sliding groove along a direction parallel to the rotation axis of the pivotal lock 410 Three chute and fourth chute. Each guide rod 423 can be mounted on a first slide slot and a second slide slot of a set of slideways, and the first slide slot and the second slide slot can be located at the front and rear sides of the guide rod. Each slider can be mounted on the third chute and the fourth chute of a set of slideways, and the third chute and the fourth chute are located on lateral sides of the slider. The slideway of this embodiment can limit the translation of the handle from different positions or directions, which can reduce the shaking of the handle during vertical translation, significantly improve the stability of the vertical translation of the handle, and further improve the process of locking or unlocking the refrigerator drawer 10. The stability in .

In some embodiments of the present invention, the locking device 420 may also include two elastic members configured to have a force to return the handle to its original position at least after the handle is subjected to an active force and slides in the vertical direction and after the active force disappears. . In some embodiments, after the human hand pulls the handle to unlock the pivoting lock 410 , the force of the human hand disappears, and the elastic member springs the handle back to the initial position when the handle is locked. The elastic member can be a spring, and is disposed above or below the locking device 420 to provide force to the locking device 420 through compression or stretching. For example, each spring is disposed above the sliding block 424 of the locking device 420 , its upper end is fixed to the front mounting plate 211 , and its lower end is in contact with the upper surface of the sliding block 424 to provide downward elastic force when the sliding block 424 slides upward. In some alternative embodiments, the handle may further include an elastic device and a retaining device. Wherein, the elastic device can be installed on the refrigerator drawer 200 and configured to force the handle to move to a preset position. The retaining device can be configured to keep the handle at a certain position after detaching from the pivoting lock 410 , and the retaining device loses its retaining function when an external force is applied to the handle. For example, the elastic device is two springs, which are respectively arranged above the two ends of the handle, and the retaining device is a buckle. Unlocking is achieved when the handle is pressed down from the pivoting catch 410, allowing the refrigerator drawer 200 to be pulled out. When the handle is pressed to a certain position, the handle remains motionless due to the buckle, and at this moment, the spring has an upward pulling force on the handle. After the refrigerator drawer 200 is pushed in, use the hand to act on the handle to make it disengage from the buckle, and return the handle to the preset position under the tension of the spring. of the lock.

In some embodiments of the present invention, the Hall switch element 320 can be arranged on the upper part of a side wall of the box body 100, the magnet 310 can be arranged on the front end of the refrigerator drawer 200, and the Hall switch can be in the shape of a strip, and the magnet 310 Can be a magnet block. The refrigerator drawer 200 may include a drawer body 210 and a drawer front cover 220, wherein the drawer body 210 may have a bottom plate, two side plates, a rear plate and a front mounting plate 211, and the two side edges of the front mounting plate 211 may be located on the two side plates. outside. The drawer front cover 220 can have an operation opening 221 installed on the front side of the front mounting plate 211 , and can define a receiving cavity with the front mounting plate 211 . The locking device 420 and the magnet 310 can be disposed in the receiving cavity. An accommodating cavity may be defined between the drawer front cover 220 and the front mounting plate 211, and the magnet 310 may be disposed in the accommodating cavity.

In some embodiments of the present invention, the refrigerator storage box 10 may also include sealing rings, which are arranged on the front surfaces of the two side walls, the upper wall and the lower wall of the box body 100, so that when the refrigerator drawer 200 returns to the box body 100 The inner side of the front mounting plate 211 is bonded to improve the airtightness of the refrigerator storage box 10 .

Embodiments of the present invention also provide a box body and the refrigerator storage box 10 of any one of the above-mentioned embodiments. Wherein, a storage space may be defined in the refrigerator, and the refrigerator storage box 10 may be disposed at the lower part of the storage space. In particular, the refrigerator may further include a nitrogen generator and a controller. The nitrogen generating device can be configured to inject nitrogen gas into the box 100 in a controlled manner. The controller can be electrically connected with the Hall switch element 320, so as to determine the opening and closing state of the refrigerator drawer 200 or the number of times of opening and closing of the refrigerator drawer 200 according to the refrigerator drawer 200 opening signal and the refrigerator drawer 200 closing signal generated by the Hall switching element 320, and According to the opening and closing state of the refrigerator drawer 200 or the opening and closing times of the refrigerator drawer 200, the start and stop of the nitrogen generator is controlled to maintain the ratio of nitrogen and prevent the freshness preservation performance of the nitrogen fresh-keeping refrigerator from being reduced due to the influx of outside air.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (9)

1. A storage box for a refrigerator, comprising a box body with a forward opening, a refrigerator drawer disposed in the box body and capable of being drawn out from the forward opening, and an induction device for sensing the opening and closing of the refrigerator drawer, Wherein, the sensing device includes: a magnet arranged on the refrigerator drawer; The Hall switch element is arranged on the box body and is configured to generate a corresponding open signal or close signal of the refrigerator drawer by sensing the change of the magnetic field of the magnet; and The refrigerator storage box also includes a locking assembly for locking the refrigerator drawer to the box body, and the locking assembly includes: The pivoting lock is rotatably installed on the refrigerator drawer, and is configured to rotate in one direction under the action of an active force when the refrigerator drawer enters the box body or after entering the box body. Cooperate with the fastening part on the box body, the number of the pivoting locks is two, and each of the pivoting locks includes an abutment part and a snap-in part that cooperates with the buckling part, The rotation axis of the pivot lock is located between the engaging portion and the abutting portion, and there are two buckling portions, and the two pivot locks are connected to the respective corresponding buckles. When the joint is matched, the direction of rotation is opposite; The locking device is installed on the refrigerator drawer and is configured to prevent the pivoting lock from rotating in the other direction opposite to the one direction after the pivoting lock is engaged with the buckle, so that The pivoting lock is kept in a mating state with the fastening portion, so as to lock the refrigerator drawer to the box body. 2. The refrigerator storage box according to claim 1, wherein, The locking device includes a handle, which has a handle portion, and two lever portions disposed at both ends of the handle portion, and the handle is slidably mounted on the pivoting lock in a direction parallel to the rotation axis of the pivoting lock. the refrigerator drawer, so that after each of the pivoting locks is engaged with the respective corresponding buckling parts, it moves to a preset position so that one end of each of the abutting rod parts and one of the abutting parts The side facing the other said abutting part contacts and abuts, so that the relative position between each said pivoting latch and said refrigerator drawer remains unchanged. 3. The refrigerator storage box according to claim 2, wherein the locking device further comprises: two guide rods, each of which extends vertically and is fixed to the handle, and each of which is slidably mounted on the refrigerator drawer; and Two sliders, each of which is fixed to the handle and is slidably mounted on the refrigerator drawer along the vertical direction. 4. The refrigerator storage box according to claim 3, wherein The two pivoting locks are arranged on both sides of the front end of the refrigerator drawer, and the rotation axis of each of the pivoting locks extends along the vertical direction. 5. The refrigerator storage box according to claim 3, wherein the locking device further comprises: two sets of slideways, each set of slideways having a first slideway, a second slideway, a third slideway and a fourth slideway along a direction parallel to the axis of rotation of the pivotal lock; Each of the guide rods is mounted on the first chute and the second chute of a set of slideways, and the first chute and the second chute are located on the front and rear sides of the guide rod; Each of the sliders is mounted on the third chute and the fourth chute of a group of the slideways, and the third chute and the fourth chute are located on lateral sides of the slider. 6. The refrigerator storage box according to claim 1, wherein The Hall switch element is arranged on the upper part of a side wall of the box body; The magnet is arranged at the front end of the refrigerator drawer. 7. The refrigerator storage box of claim 6, wherein the refrigerator drawer comprises: The drawer body has a bottom plate, two side plates, a rear plate and a front mounting plate, and the two side edges of the front mounting plate are located on the outer sides of the two side plates; The front cover of the drawer has an operation opening on it, is installed on the front side of the front mounting plate, and defines an accommodating cavity with the front mounting plate; the locking device and the magnet are arranged in the accommodating cavity. 8. A refrigerator comprising: a cabinet defining a storage space therein; and According to the refrigerator storage box according to any one of claims 1 to 7, the box body of the refrigerator storage box is arranged at the lower part of the storage space. 9. The refrigerator according to claim 8, further comprising: A nitrogen generating device configured to inject nitrogen into the box in a controlled manner; a controller, electrically connected to the Hall switch element, so as to determine the open/close state of the refrigerator drawer or the refrigerator drawer open/close state according to the refrigerator drawer open signal and the refrigerator drawer close signal generated by the Hall switch element. The opening and closing times of the refrigerator drawer, and control the start and stop of the nitrogen generator according to the opening and closing state of the refrigerator drawer or the opening and closing times of the refrigerator drawer.