This application claims priority to Chinese patent application No. 202010128529.7, filed on Feb. 28, 2020, and Chinese patent application No. 202010128218.0, filed on Feb. 28, 2020. The contents of the above-mentioned Chinese patent applications are incorporated herein as portions of this application.
The present disclosure relates to a ventilation door device for a refrigerator and a refrigerator having said ventilation door device.
Refrigerator is a common household appliance having main functions including storage and preservation. A refrigerator may have more than one storage compartments to store different kinds of food or other items. Generally, different storage compartments need to be maintained at different temperatures. To this end, a refrigerator is provided with cold air passages leading to each of storage compartments, and the cold air passes through the cold air passages to adjust the temperatures of different storage compartments. Each cold air passage can be provided with a ventilation door device to change the amount of cold air passing through by changing the opening and closing of each cold air passage, thereby realizing dynamic adjustment of the temperature of each storage compartments. However, current ventilation door devices have several problems.
First, the existing refrigerator ventilation door solution is unstable, and there is a situation in which the refrigerator issues an order to open or close the ventilation door, but the ventilation door could not be actually opened or closed. This will result in the inability to continuously and dynamically adjust the cold air flowing into each storage compartment as needed, and the food therein could not get appropriate temperature, and the freshness period will be greatly shortened.
Second, in the existing ventilation door solutions of refrigerators, most use a multi-stage gear transmission mechanism. When the ventilation door is in the closed position, the teeth of adjacent gears abut against each other. In order to eliminate the tolerances of gears, the pulse number for closing the door of the stepper motor is usually designed greater than the pulse number for opening the door, so that multiple gears will be stalled (in other words, rotor-locked) when the door is closed, and the accuracy of the door closing can be improved. For the traditional multi-stage gear transmission mechanism, the stalling time is too long, and the tooth-breaking phenomenon caused by insufficient gear strength might occur. Moreover, big noise is generated during the stalling process. Traditional solutions are difficult to solve both the problems of noise and tooth-breaking.
Regarding to the above-mentioned problems, this disclosure provides a new type of ventilation door device and a refrigerator having said ventilation door device, which solves the above problems due to the following technical features and brings other technical effects.
In a first aspect of the present disclosure, a ventilation door device for a refrigerator is provided. The ventilation door device includes: a frame having an end plate provided with an opening portion, and having a blocking plate assembly rotatably mounted to the end plate, the blocking plate assembly is able to rotate between a closed position where the opening portion is completely closed and an open position where the opening portion is completely open; a housing engaging the frame and forming a driving chamber between the housing and the frame; and a driving module at least partially being held in the driving chamber and driving the blocking plate assembly to rotate.
In one embodiment, the frame has a housing engagement portion located at the side edge of the end plate and extending substantially perpendicular to the end plate, and the housing is connected to the housing engagement portion of the frame.
In one embodiment, the blocking plate assembly includes a blocking plate installed on the end plate and an elastic component disposed on the blocking plate, when the blocking plate assembly is in the closed position, the elastic component abuts the frame and elastically deforms to seal the opening portion.
In one embodiment, the end plate of the frame has a sealing portion arranged around the opening portion and protruding from the end plate, and when the blocking plate assembly is in the closed position, the elastic component abuts the sealing portion of the frame.
In one embodiment, a reinforcing rib is provided on the side of the blocking plate facing away from the elastic component.
In one embodiment, the blocking plate assembly includes a first shaft portion and a second shaft portion provided at both ends of the blocking plate, and the blocking plate assembly is mounted to the frame through the first shaft portion and the second shaft portion, a clamping structure is provided inside the first shaft portion, and the driving module drives the blocking plate assembly to rotate through the clamping structure.
In one embodiment, the ventilation door device further includes a heater installed to the end plate and at least partially surrounding the opening portion.
In an embodiment, the frame further includes an edge plate extending from an outer edge of the end plate, and the edge plate surrounds the heater.
In one embodiment, the shape of the heater at least partially matches the shape of the end plate.
In one embodiment, the ventilation door device is configured to generate an electrical signal when the blocking plate assembly is in the closed position or the open position, and when the blocking plate assembly is in a middle position between the closed position and the open position, no electrical signal is generated or another electrical signal is generated. The ventilation door device is configured to activate the heater if the disappearance of said electrical signal or the change from said electrical signal to said another electrical signal is not detected within a predetermined time after receiving the command to rotate the blocking plate assembly.
In an embodiment, the ventilation door device further includes a micro switch, and a transmission gear in the driving module includes two contacts extending radially from said transmission gear, wherein the micro switch and the transmission gear are designed as follows: when the blocking plate assembly is in the closed position, one of the two contacts triggers a static contact of the micro switch, so that the micro switch generates the electrical signal; when the blocking plate assembly is in the open position, the other of the two contacts triggers the static contact of the micro switch, so that the micro switch generates the electricity signal; and when the blocking plate assembly is in the middle position between the closed position and the open position, neither of the two contacts triggers the static contact of the micro switch, so that the micro switch does not generate the electrical signal or generates another electrical signal.
In one embodiment, the predetermined time is 3 seconds to 8 seconds.
In one embodiment, the ventilation door device further has a circuit board, and the circuit board has: a first coupling portion for coupling with the micro switch; a second coupling portion for coupling with the driving module; and a third coupling part for coupling the heater.
In one embodiment, the driving module includes: a stepper motor; a teeth missing gear, which is connected to the stepper motor; a sector gear, which meshes with the teeth missing gear; an output shaft, which is connected to the sector gear and is connected to the blocking plate; and the stepper motor can drive the blocking plate to rotate via the teeth missing gear, the sector gear and the output shaft.
In one embodiment, the sector gear includes a sector gear teeth portion, a cylindrical portion and a sector gear output portion which are sequentially arranged along an axial direction; and the teeth missing gear includes a shaft portion and a circular gear teeth portion, the circular gear teeth portion includes a circular gear section with gear teeth and an arc section without gear teeth, and the gear teeth on the gear teeth section mesh with the gear teeth on the sector gear teeth portion. The output portion of the sector gear can be in the form of a rotating shaft and is used to connect to a clamping structure in the form of a slot at the first shaft portion of the blocking plate; alternatively, the output portion of the sector gear can also be in the form of a slot and is used to connect to a clamping structure in the form of a protrusion at the first shaft portion.
In one embodiment, the frame has a bottom plate portion extending perpendicular to the plane where the opening portion is located, and the bottom plate portion includes: a first cylindrical portion for rotatably supporting the cylindrical portion of the sector gear inside the first cylindrical portion; and a second cylindrical portion for rotatably supporting the shaft portion of the teeth missing gear inside the second cylinder portion.
In one embodiment, inside the first cylinder portion, the bottom plate portion has a through hole allowing the sector gear output portion passing through as the output shaft to extend to the blocking plate.
In one embodiment, the second cylindrical portion has an arc groove, and the arc groove is recessed away from the end surface of the second cylindrical portion, and the center of the arc groove coincides with the axis of the cylinder part, and the arc groove extends between two limiting surfaces; and the teeth missing gear has an arc-shaped protrusion that protrudes from the side surface of the circular gear teeth portion of the teeth missing gear and is configured to be able to extend into the arc groove, and move along the arc groove with the rotation of the teeth missing gear, any one of the two limiting surfaces is used to abut the arc-shaped protrusion to limit the rotation of the teeth missing gear.
In one embodiment, the ventilation door device further includes a micro switch with a static contact; the teeth missing gear further includes a contact portion having two contacts; when the blocking plate is in the open position, one of the two contacts engages the static contact of the micro switch, and the micro switch sends an electrical signal; when the blocking plate is in the closed position, the other of the two contacts engages the static contact of the micro switch, and the micro switch sends the electrical signal; when the blocking plate is in a middle position between the closed position and the open position, the contact portion does not engage the static contact of the micro switch, and the micro switch does not send the electrical signal or sends a different signal from said electrical signal.
In one embodiment, the contact portion is arranged on the side of the gear teeth portion of the teeth missing gear away from the shaft portion, and the contact portion has two arms extending radially outwardly, the end of each arm forms a contact, and each contact is located farther from the center of the teeth missing gear than the remaining portions of the contact portion.
In one embodiment, the outer periphery of the teeth missing gear has an arc section next to its teeth section; when the blocking plate is in the closed position, the outer surface of the arc section of the teeth missing gear abuts the sector gear, thereby preventing the sector gear from rotating in the direction of opening the blocking plate.
In one embodiment, the outer periphery of the sector gear has a concave locking arc next to its teeth section, and the concave locking arc is recessed toward the center of the sector gear; when the blocking plate is in the closed position, a part of the arc section enters the interior of the concave locking arc, preventing the concave locking arc from rotating relative to the arc section, thereby the teeth missing gear prevents the sector gear from rotating in the direction of opening the blocking plate.
In one embodiment, when the blocking plate is in the closed position, the distance between any point on the concave locking arc and the center of the teeth missing gear is greater than the radius of the arc section, so as to not block the arc section from rotating relative to the concave locking arc, thereby the teeth missing gear can idly rotate by an idling angle in the direction of closing the ventilation door.
In one embodiment, the frame has a second cylindrical portion that rotatably supports the teeth missing gear, and the second cylindrical portion has an arc groove, and the arc groove extends between two limiting surfaces; the teeth missing gear has an arc-shaped protrusion configured to be able to extend the interior of the arc groove and move along the arc groove with the rotation of the teeth missing gear, until it abuts against any one of the two limiting surfaces; and the angle between the two limiting surfaces is a first angle, and the angle across which the teeth missing gear rotates when the blocking plate is driven to rotate from the open position to the closed position is a second angle, and the first angle is equal to the sum of the second angle and the idling angle.
In one embodiment, the radius of the arc section of the teeth missing gear is R1, the distance from the arc end point of the concave locking arc of the sector gear to the center of the sector gear is L2, the distance between centers of the sector gear and the teeth missing gear is L, and wherein R1+L2−L is the amount of interference L1, and L1 is greater than zero.
In one embodiment, the range of the interference amount L1 is: 0.05 mm≤L1≤1 mm
The driving module includes: a stepper motor; a teeth missing gear connected to the stepper motor, and the teeth missing gear includes an arc section without gear teeth; a sector gear meshing with the teeth missing gear; and an output shaft connected to the sector gear and connected to the blocking plate; wherein the stepper motor can drive the blocking plate to rotate via the teeth missing gear, the sector gear and the output shaft; and wherein when the blocking plate is in the closed position, a portion of the arc section of the teeth missing gear is located between two teeth of the sector gear, and the teeth missing gear prevents the sector gear from rotating in the direction of opening the shutter.
In one embodiment, the sector gear has a first tooth that enters meshing last when the blocking plate is closed and a second tooth next to the first tooth, the end surface of the first tooth facing the output shaft is farther away from the end surface of the second tooth facing the output shaft; the teeth missing gear further has an arc-shaped groove, the radius of the outer surface of the arc-shaped groove is smaller than the radius of the outer surface of the arc section, the arc-shaped groove is located on the side of the arc section away from the output shaft, the outer surface of the arc section and the outer surface of the arc-shaped groove are connected by an inner end surface; when the blocking plate is in the closed position, the arc-shaped groove accommodates the first tooth inside, and the outer surface of the arc section is partially located between the first tooth and the second tooth and abuts against the second tooth, the second tooth is prevented from rotating relative to the arc section, so that the teeth missing gear prevents the sector gear from rotating in the direction of opening the blocking plate.
In one embodiment, when the blocking plate is in the closed position, the distance between any point on the second tooth and the center of the teeth missing gear is greater than the radius of the arc section, so as to not prevent the arc section from rotating relative to the second tooth, so that the teeth missing gear can idly rotate by an idling angle in the direction of closing the ventilation door.
In one embodiment, the sector gear further has a third tooth next to the second tooth, the third tooth and the second tooth are connected by a connecting portion at the side adjacent to the output shaft.
In one embodiment, the end faces of the third tooth and the second tooth on the side adjacent to the output shaft are closer to the output shaft than the end faces of the other teeth on the sector gear on the side adjacent to the output shaft.
In one embodiment, the radius of at least part of the addendum circle of the second tooth of the sector gear is smaller than the radius of the addendum circles of the remaining teeth.
In one embodiment, a part of the second tooth away from the output shaft is cut away.
In one embodiment, the part of the second tooth outside the inner end surface of the arc section is completely cut off.
In one embodiment, both ends of the arc section of the teeth missing gear are immediately connected to the gear teeth section, and the radius of the arc section of the teeth missing gear is larger than that of the addendum circle of the gear teeth section.
In one embodiment, the outer peripheral surface of the arc section of the teeth missing gear and the tooth face of the first tooth of the gear teeth section that enters meshing firstly when the door is opened are connected by an arc-shaped guide surface.
In a second aspect of the present disclosure, a refrigerator is provided, which includes: one or more storage compartments; one or more cold air passages leading to the one or more storage compartments; and one or more ventilation door devices as mentioned above, wherein the opening portion of each ventilation door device is arranged in the corresponding cold air passage, so that the cold air delivery amount in the corresponding cold air passage is controlled by the opening and closing of the opening portion of the corresponding ventilation door device.
Hereinafter, the best embodiments for implementing the present disclosure will be described in more detail with reference to the accompanying drawings, so that the features and advantages of the present disclosure can be easily understood.
In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the accompanying drawings of the embodiments of the present disclosure will be briefly introduced below. The drawings are only used to show some embodiments of the present disclosure, rather than limiting all the embodiments of the present disclosure to them.
List of Reference Numbers 10 ventilation door device
100 frame
101 opening portion
102 sealing portion
103 end plate
104 edge plate
105 wiring portion
106 bottom plate potion
107 housing engagement portion
200 housing
300 blocking plate assembly
301 blocking plate
302 elastic component
303 flat plate portion
305 first shaft
306 second shaft
307 reinforcing rib
400 driving module
402 transmission assembly
403 stepper motor
404 motor output shaft
405, 405′ teeth missing gear
406, 406 sector gear
407 output shaft
408 circuit board
409 micro switch
410 first cylindrical portion
411 second cylindrical portion
412 first limiting surface
413 second limiting surface
414 arc groove
415 supporting portion
416 slot portion
417 through hole
421 first coupling portion
422 second coupling portion
423 third coupling portion
424 motor limiting portion
425 tinned hole
H heater
X rotation axis
431 shaft portion
432, 432′ sector gear teeth portion
433 cylindrical portion
434, 434′ sector gear output potion
435 flat portion
436 gear teeth section
437 concave locking arc
441 shaft portion
442 gear teeth section
443, 443′ contact portion
444, 444′ gear teeth section
445, 445′ arc section
446 contact
447 shaft hole
448, 448′ arc-shaped protrusion
451 first tooth of sector gear
452 second tooth of sector gear
453 third tooth of the sector gear
454 connection portion
455 arc shaped groove
456 inner surface
457 first tooth of teeth missing gear
458 arc shaped guiding surface
In order to make the objectives, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure.
The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments.
Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present disclosure.
1. Overall Structure
An exemplary embodiment of the ventilation door device 10 of the present disclosure will be described with reference to
The ventilation door device 10 mainly includes a frame 100, a housing 200 and a driving module. The housing 200 is joined to the frame 100 and a driving chamber is formed between the housing 200 and the frame 100. The driving module is at least partially held in the driving chamber, as shown in
The frame 100 has an end plate 103 provided with an opening portion 101. The opening portion 101 may be an opening and closing port of a cold air passage that delivers cold air to the storage compartment of the refrigerator to maintain its temperature. In other words, the opening portion 101 is provided in the corresponding cold air passage of the refrigerator, and the cold air delivery amount in the corresponding cold air passage can be adjusted by controlling the opening and closing of the opening portion 101.
The frame 100 also has a blocking plate assembly 300 rotatably mounted to the end plate 103, and the blocking plate assembly 300 can be rotated between a closed position where it completely closes the opening portion 101 and an open position where it completely opens the opening portion 101.
The frame 100 also has a housing engagement portion 107 located at the side edge of the end plate 103 and extending substantially perpendicular to the end plate 103. Specifically, the housing engagement portion 107 may be a structural part extending from the side edge of the frame 100 in a direction perpendicular to the rotation axis of the blocking plate 301 and perpendicular to the end plate 103 of the frame 100. In this way, the frame 101 may be divided into two portions: the housing engagement portion 107 and the remaining portion including the end plate 103. For example, referring to
The elastic component 302 may be attached to the flat portion 303 of the blocking plate 301, and the shape of the elastic component 302 can match the shape of the flat portion 303 of the blocking plate 301, for example, a sheet-like rectangular shape. The elastic component 302 may be composed of materials such as foamed polyurethane. When the blocking plate assembly 300 is in the closed position, the elastic component 302 abuts the frame 100 and deforms elastically to seal the opening portion 101. For example, the end plate 103 of the frame 100 has a sealing portion 102 around the opening portion 101 and protruding from the end plate 103. When the blocking plate assembly 300 is in the closed position, the elastic component 302 abuts against the sealing portion 102 of the frame 100. The abutment of the elastic component 302 against the sealing portion 102 effectively increases the sealing performance of the blocking plate 301 to the opening portion 101.
According to an exemplary solution, the housing 200 and the frame 100 are connected in a snap-fit manner For example,
The driving module drives the blocking plate assembly 300 to rotate. The driving module may include a motor and a transmission assembly. The motor is, for example, a stepper motor. The transmission assembly transmits the power from the motor to the blocking plate assembly 300 to drive the blocking plate assembly 300 to rotate, thereby controlling the opening and closing degree of the opening portion 101, and thereby controlling the amount of cold air passing through the cold air passage. The driving module is located within the driving chamber, as shown in
2. Heater
The ventilation door device 10 may further include a heater H. According to the solution of the present disclosure, the heater H is installed to the end plate 103 of the frame 100 and at least partially surrounds the opening portion 101. For example, the shape of the heater H may at least partially match the shape of the end plate 103. For example,
According to an exemplary solution, the frame 100 further includes an edge plate 104 extending from the outer edge of the end plate 103, which partially surrounds the heater H. The extension direction of the edge plate 104 is the same as the extension direction of the housing engagement portion 107, and both extend away from the opening from the side of the opening portion 101 where the blocking plate assembly 300 is installed. For example, referring to the embodiment shown in
Although the figures show that the heater is arranged on the side of the end plate close to the opening direction of the blocking plate assembly, according to another exemplary solution, the heater may be arranged on the back of the end plate, that is, on the side of the end plate away from the opening direction of the blocking plate assembly. For the solution in which the heater is arranged on the back of the end plate, for example, a groove surrounding the opening may be formed on the back of the end plate, and the heater may be arranged in the groove. Through such solution, a compact space arrangement can be realized, and the heater can be also protected.
The ventilation door device 10 is configured to generate an electrical signal when the blocking plate assembly 300 is in the closed position or the open position; and not generate an electrical signal or generate another electrical signal when the blocking plate assembly 300 is in a middle position between the closed position and the open position. The ventilation door device 10 is configured to monitor the signals, and if the ventilation door device 10 does not detect the disappearance of said electrical signal or does not detect the transform from said electrical signal to said another electrical signal within a predetermined time period after receiving the command to rotate the blocking plate assembly 300, the heater H will be activated. For example, the predetermined time period may be 3 to 8 seconds. In an exemplary embodiment, when the blocking plate assembly 300 is in the closed position or the open position, an electrical signal “1” is generated; and when the blocking plate assembly 300 is in a middle position between the closed position and the open position, an electrical signal “0” is generated. The ventilation door device 10 is configured to monitor the signals, and if the ventilation door device 10 does not detect a signal change within a predetermined time after receiving the command to rotate the blocking plate assembly 300, the heater H is activated.
Through this kind of control, when the stepper motor is driven to open the ventilation door, if the electrical signal change can be detected, it indicates that the door is not frozen and can be normally opened; and if the electrical signal change cannot be detected, it indicates the door might be frozen due to frost, then the heater H is activated to melt the frost and return the blocking plate 301 back to normal opening. In this way, it is avoided that the ventilation door freezes in the fully open or fully closed position and could not normally work due to frost or icing.
The above heating solution can be specifically realized by using a micro switch 409. The micro switch 409 can be arranged in the driving chamber, for example, on a circuit board located in the driving chamber. One of the transmission components of the driving module, such as the teeth missing gear described in detail below, may include two contacts 446 protruding in the radial direction. By setting the installation position of the teeth missing gear, when the blocking plate assembly 300 is in the closed position, a contact 446 triggers a static contact of the micro switch 409, so that the micro switch 409 generates an electrical signal, and when the blocking plate assembly 300 is in the open position, another contact 446 triggers the static contact of the micro switch 409, so that the micro switch 409 also generates an electrical signal; and when the blocking plate assembly 300 is in a middle position between the closed position and the open position, no contact 446 contacts the static contact of the micro switch 409, and the micro switch 409 does not generate any electrical signal or generates another electrical signal.
The heater H may be electrically connected to the circuit board. More about the circuit board will be introduced below. For example, the frame 100 includes a wiring portion 105, which is in the form of a groove formed in the frame 100, and can extend from a position of the housing engagement portion 107 of the frame 100 close to the end plate 103 to a position near the mounting position of the circuit board of the frame 100. For example,
3. Circuit Board
As mentioned above, the ventilation door device 10 may also include a circuit board.
According to an exemplary solution, the circuit board has coupling parts for the heater H, the driving module (specifically, the motor of the driving module), and the like. In the embodiment shown in the drawings, the circuit board includes a first coupling portion 421 for coupling the micro switch 409, a second coupling portion 422 for coupling the driving module, and a third coupling portion 423 for coupling the heater H. In addition, the circuit board has a motor limiting portion 424 for limiting the position of the stepper motor, which is in the form of holes formed in the circuit board.
In order to facilitate the installation of the circuit board, the frame 100 is provided with, for example, a slot portion 416 into which the circuit board is inserted. The slot portion 416 may be provided on the side of the housing engagement portion 107 of the frame 100 facing the driving chamber, so that the circuit board is arranged in the driving chamber. As best shown in
According to an exemplary solution, the circuit board is provided with tin-plated holes penetrating the circuit board, so that when one side of the circuit board fails, the other side can still work to ensure the energizing of the circuit.
4. Driving Module
The driving module 400 of the ventilation door device 10 is used to drive the blocking plate 301 to rotate between the fully opened state shown in
In
Referring to
The structure of the sector gear 406 according to an exemplary embodiment is shown in
Continuing to refer to
The structure of the teeth missing gear 405 according to an exemplary embodiment is shown in
As shown in
Return to refer to
The working mechanism of the driving module 400 of the present disclosure is as follows:
The contacts 446 cooperate with the static contact on the micro switch 409 to provide electrical signal feedback. In an exemplary embodiment, when the blocking plate 301 is fully opened or fully closed, an electrical signal is output (e.g., the output signal “1”); and during the rotation of the blocking plate 301, no electrical signal is output (e.g., the output signal “0”). When driving the stepper motor to open the ventilation door, if the electrical signal change can be detected, it indicates that the ventilation door is not frozen and is opened normally; and if the electrical signal change cannot be detected, it indicates that the ventilation door may be frozen due to frost. The heating function can then be activated to melt the frost and make the blocking plate 301 return to normal.
5. Locking Mechanisms
In order to prevent the blocking plate 301 from rotating in the opening direction due to rebound of the elastic component 302, air flowing, vibration, etc., after reaching the closed position, the driving module 400 may be provided with a locking mechanism. The present disclosure provides the following two different locking structures, namely, an arc-shaped locking structure (
5.1 Arc-Shaped Locking Structure
In the first embodiment, the locking mechanism is composed of a concave locking arc 437 of the sector gear 406 and the arc section 445 of the teeth missing gear 405. As shown in
When the blocking plate 301 is in the closed position, as shown in
In addition to the locking function, this locking structure also has the function of allowing the teeth missing gears to idle and shortening the locked-rotation time of the stepper motor when the door is closed.
In this solution, when the blocking plate 301 is closed in place, that is, when the elastic component 302 abuts against the sealing portion 102 of the frame 100 and is elastically deformed, the second limit surface 413 of the circular arc groove 414 of the housing 200 and arc-shaped protrusion 448 of the teeth missing gear 405 has not yet abutted. Then, the arc section 445 of the teeth missing gear 405 has entered the concave locking arc 437 of the sector gear 406, but it can still continue rotate forward relative to the concave locking arc 437 (at this time, the stepper motor 403 is idling, that is, the blocking plate 301 is not driven to further rotate) until the second limit surface 413 abuts the arc-shaped protrusion 448, and finally the stepper motor 403 is prevented from rotating. The angle at which the teeth missing gear 405 can continue to rotate is referred as idling angle α.
During closing the door, it is necessary to design the stepper motor 403 to stall. The purpose of stalling is to reset the gears of the stepper motor 403 to zero position, so that the ventilation door 301 can return to the same position when the door is closed in the next round. The, the tolerance of the gear rotation is eliminated, so that the ventilation door is closed more accurately, and the opening portion 101 is more reliably closed by the blocking plate 301. If the pulse number for opening rotation of the stepper motor 403 set by the client is M and the pulse number for closing is N, then N−M=W, W is the pulse number of the stepper motor for minimum stalling, and A is the idling pulse number of the stepper motor.
The inventor found that if the overall angle θ that the stepper motor 403 drives the teeth missing gear 406 to rotate is equal to the rotation angle β of the teeth missing gear 406 required for the blocking plate 301 to close in place, after the ventilation door is closed in place, if it needs to complete the pulse number N desired by the motor, the pulse number of the stepper motor 403 that needs to be stalled is W+A. If the stalling time is too long, it will cause the risk of gear breakage. For this reason, in the solution of the present disclosure, the idling angle a is increased by the above-mentioned locking mechanism, so that the arc-shaped protrusion 448 of the teeth missing gear 405 idles for a certain number of pulse steps before reaching the second limit surface 413. This shortens the blocking time and reduces the risk of tooth breakage.
5.2 Tooth-Shaped Locking Structure
In the second embodiment, the locking mechanism is composed of the first tooth 451 and the second tooth 452 at the end of the sector gear 406′, and the arc section 445′ of the teeth missing gear 405′.
Referring to
Referring to
When the blocking plate 301 is in the closed position, as shown in
In this configuration, on the one hand, the arc section 445′ of the teeth missing gear 405′ can continue to rotate over a certain angle relative to the second tooth 452 of the sector gear 406′ after the blocking plate 301 reaches the closed position, achieving idling of the teeth missing gear 405′ and the stepper motor 403, until the arc-shaped protrusion 448′ on the teeth missing gear 405′ abuts the corresponding second limit surface 413, which helps to shorten the stalling time of the stepper motor.
On the other hand, since the outer surface of the arc section 445′ abuts against the second tooth 452, the sector gear 406′ can be prevented from rotating in the direction of opening the ventilation door. Then, the ventilation door can be prevented from opening due to the rebound of the elastic element 302 on the blocking plate 301, the impact of the airflow or the vibration. Then, the tightness of the closed door could be improved. In addition, the tops of the second tooth 452 and the third tooth 453 of the sector gear 406′ are connected by the connecting portion 454. This structure can increase the strength of the gear and increase the contact area of the second tooth 452, thereby effectively avoiding tooth breakage due to the impact when the arc section 445′ of the teeth missing gear 405′ abuts against the second tooth 452 of the sector gear 406′.
The above structure might have noise problem when opening and closing the ventilation door. For example, referring to
The ventilation door mechanism provided in the present disclosure can be used in various types of refrigerators. For example, a refrigerator includes one or more storage compartments. The refrigerator has one or more cold air passages leading to the one or more storage compartments, respectively. The opening portions of the ventilation door devices are respectively arranged in the corresponding cold air passages, so that the amount of cold air delivered in the corresponding cold air passages can be controlled by the opening and closing of the opening portions of the corresponding ventilation door devices.
Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those with ordinary skills in the field to which this disclosure belongs. The “first”, “second” and similar words used in the description and claims of this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “a”, “an” or “one” do not necessarily indicate quantitative restrictions. “include” or “comprise” and other similar words mean that the element or item appearing before them covers the elements or items listed after them and their equivalents, but does not exclude other elements or items. Similar words such as “connect” or “couple” are not limited to physical or mechanical connections, but may include electrical connections, in both direct or indirect connections. “Upper”, “lower”, “left” and “right” are only used to indicate the relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.
The exemplary embodiments in the present disclosure are described in detail above. However, those skilled in the art can understand that, without departing from the concept of the present disclosure, there are many variations and modifications to the embodiments, and various technical features and structures in the present disclosure can be combined in various ways without exceeding the protection scope of the present disclosure, which is determined by the appended claims.
Number | Date | Country | Kind |
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202010128218.0 | Feb 2020 | CN | national |
202010128529.7 | Feb 2020 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2021/073742 | 1/26/2021 | WO |