CN218627464U

CN218627464U - Outer rotor brushless motor refrigerator door opening mechanism

Info

Publication number: CN218627464U
Application number: CN202223035414.7U
Authority: CN
Inventors: 宋洪典; 周勇; 颜士伟; 邓佳骏
Original assignee: Jiangsu Leili Motor Co Ltd
Current assignee: Jiangsu Leili Motor Co Ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-03-14
Anticipated expiration: 2032-11-15

Abstract

The utility model discloses an outer rotor brushless motor refrigerator door opening mechanism, which comprises a shell, a shell cover which is covered with the shell to form a box body with a lateral opening, and a driving motor, a gear transmission group and a rack which are positioned in the box body and are engaged with each other in sequence for transmission; the rack reciprocates along the direction vertical to the lateral opening and can extend out of the lateral opening in a door opening state; the driving motor is an outer rotor brushless motor, and the axial directions of the driving motor and the gear transmission set are both vertical to the end surface of the shell. The one end that is located the rack and withdraws the direction in the casing is equipped with shock-absorbing structure, shock-absorbing structure is the U type structure that the opening set up towards the rack, and shock-absorbing structure's opening width slightly is less than the width that is located the rack of shock-absorbing structure. The utility model discloses a transmission efficiency is higher, wearing and tearing and noise are less, the great external rotor brushless motor of output moment, simultaneously through rack rear shock-absorbing structure's improved design, alleviates the motion that external rotor brushless motor caused and crosses hard phenomenon.

Description

Outer rotor brushless motor refrigerator door opening mechanism

Technical Field

The utility model relates to a domestic appliance designs the field, especially relates to an outer rotor brushless motor refrigerator mechanism of opening a door.

Background

The door opening mechanism can be used in the field of refrigerators or intelligent homes, the mechanism is assembled at the top or the bottom of the cabinet body, and the motor rotates after receiving a door opening signal, so that the rack is driven to move to knock the door body. The existing door opening mechanism adopts a scheme of a structure of a brush motor and a worm and helical gear transmission in most direct currents, and has the following main problems:

1. the efficiency is low. The highest transmission efficiency of the worm and the helical gear is about 0.7, the straight gear transmission is about 0.95 generally, and finally the rack outputs impact force under the same motor torque, and the worm and helical gear scheme is smaller than the straight gear transmission scheme.

2. The direct current brush motor has the advantages of high noise, short service life and low torque. The direct current has brush motor, adopt outer magnetic ring + interior wire winding rotor scheme, owing to there is carbon brush electricity biography loss, often output efficiency is lower, and carbon brush commutator wearing and tearing directly influence noise and life-span, and no matter the direct current has the brush or is inner rotor brushless motor, its output torque is little than outer rotor motor (compare under the equal motor diameter, because outer rotor motor's the output arm of force leads to greatly), this rotational speed that just needs the motor to be higher and the gear of higher reduction ratio, thereby make the noise aggravate more.

Although the output torque of the outer rotor motor is large, the mechanism driven by the outer rotor motor is too hard to move, and the impact force between the outer rotor motor and the shell is increased when the rack is retracted in the door opening mechanism, so that the application of the outer rotor motor to the door opening mechanism in the prior art is precedent.

SUMMERY OF THE UTILITY MODEL

In order to solve among the prior art door opening mechanism drive unit have transmission efficiency low, output torque little, life is lower, the great technical problem of noise, the utility model provides an outer rotor brushless motor refrigerator door opening mechanism solves above-mentioned problem.

The utility model provides a technical scheme that its technical problem adopted is: a door opening mechanism of an outer rotor brushless motor refrigerator comprises a shell and a shell cover, wherein the shell and the shell cover are covered to form a box body with a lateral opening; the rack reciprocates along the direction vertical to the lateral opening and can extend out of the lateral opening in a door opening state; the driving motor is an outer rotor brushless motor, and the axial directions of the driving motor and the gear transmission set are both vertical to the end surface of the shell.

The one end that is located the rack and withdraws the direction in the casing is equipped with shock-absorbing structure, shock-absorbing structure is the U type structure that the opening set up towards the rack, and shock-absorbing structure's opening width slightly is less than the width that is located the rack of shock-absorbing structure.

Furthermore, the shock-absorbing structure is provided with an inner bottom surface abutted against the rear end face of the rack and an inner side surface attached to two parallel side faces of the rack.

Furthermore, the rear end face of the rack and two parallel side faces of the rack are in fillet transition.

Furthermore, the inner side wall of the shock absorption structure is provided with a plurality of grooves.

Further, driving motor's output is equipped with drive gear, gear drive group includes a plurality of gear sets, every group the gear set includes gear wheel and the pinion of coaxial setting, the gear wheel meshing in the pinion in the higher level gear set and the gear wheel of subordinate, just drive gear, gear wheel and pinion are the spur gear.

Further, driving motor's output is equipped with drive gear, gear drive group includes a plurality of gear sets, every group the gear set includes gear wheel and the pinion of coaxial setting, the gear wheel meshing in the pinion in the higher level gear set and the gear wheel of subordinate's gear set, the gear wheel in drive gear and the first order gear set is the helical gear, and all the other gear wheels and pinions are the spur gear.

Further, be equipped with reset spring in the casing and be located the micro-gap switch of rack one side, reset spring's one end is fixed with the rear end of rack, the other end is fixed with the casing that is located the rack rear, is equipped with the trigger bump towards one side of micro-gap switch on the rack, when the rack is in the complete release state, trigger bump and micro-gap switch contact to make driving motor close.

Furthermore, the driving motor comprises a stator casing, a rotor casing, a motor output shaft, a stator core, a rotor magnetic ring and a control panel, the rotor magnetic ring, the rotor casing and the motor output shaft are fixedly connected, the stator casing, the control panel and the stator core are fixedly connected, the motor output shaft is rotatably connected with the stator casing, and the rotor magnetic ring is located on the periphery of the stator core.

Furthermore, the outer diameter of the stator casing is larger than that of the rotor casing, and the stator casing is fixedly connected with the shell.

Furthermore, one or more Hall chips for detecting the rotating speed of the rotor magnetic ring are arranged on the control panel.

Further, the driving motor is a nine-slot six-pole brushless motor.

The utility model has the advantages that:

(1) The utility model discloses direct current motor and the drive replacement of worm helical gear complex that the mechanism used of will tradition open the door are higher for transmission efficiency, wearing and tearing and the less and great external rotor brushless motor drive of output moment of noise, the output shaft that makes driving motor arranges with gear drive assembly's center pin is equal perpendicularly, the area occupied is little, simple to operate, simultaneously through rack rear shock-absorbing structure's improved design, make shock-absorbing structure increase the frictional force of the width direction both sides of rack, reduce the impact when the rack is returned, alleviate the motion that external rotor brushless motor caused and cross hard phenomenon.

(2) The utility model provides a shock-absorbing structure has three contact site with the rack, including two side direction buffering positions and a bottom spacing position, diversely avoid the rack motion striking, reduce mechanism's noise, improve mechanism's life.

(3) The utility model discloses a process of closing the door drives the rack through reset spring and returns and spacing by shock-absorbing structure, and the process of opening the door then is driven by driving motor and spacing by micro-gap switch, and micro-gap switch's trigger point can directly arrange on the rack, does not need other transmission parts, and overall structure is simple, and the precision of opening the door is higher.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is an exploded view of an embodiment of a door opening mechanism of a refrigerator with an external rotor brushless motor according to the present invention;

FIG. 2 is an enlarged view of FIG. 1 at a;

fig. 3 is a state diagram of the outer rotor brushless motor refrigerator door opening mechanism according to the present invention in a state of being closed or in a state of just preparing for pushing out the rack;

fig. 4 is a state diagram of the outer rotor brushless motor refrigerator door opening mechanism in the process of pushing out or returning the rack;

fig. 5 is a state diagram of the outer rotor brushless motor refrigerator door opening mechanism of the present invention in a state of being opened or a state of just preparing for the rack to return;

fig. 6 is a schematic diagram of a specific embodiment of a door opening mechanism of a refrigerator with an outer rotor brushless motor according to the present invention.

Fig. 7 is a schematic diagram of a driving motor in a door opening mechanism of a refrigerator with an outer rotor brushless motor according to the present invention.

In the figure, 1, a housing, 2, a housing cover, 3, a lateral opening, 4, a driving motor, 401, a stator housing, 402, a rotor housing, 403, a motor output shaft, 404, a stator core, 405, a rotor magnetic ring, 406, a control panel, 407, a bearing, 5, a gear transmission group, 501, a gear group, 502, an output gear, 5021, a starting tooth, 6, a rack, 601, a trigger bump, 7, a damping structure, 701, an inner bottom surface, 702, an inner side surface, 703, a strip-shaped groove, 8, a damping positioning part, 9, a motor positioning part, 10, a rack positioning rib, 11, a gear positioning column, 12, a driving gear, 13, a microswitch, 1301, a pressing arm, 14, a switch positioning part, 15 and a return spring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A door opening mechanism of an outer rotor brushless motor refrigerator comprises a shell 1, a shell cover 2, a driving motor 4, a gear transmission group 5 and a rack 6, wherein the shell cover 2 is covered with the shell 1 to form a box body with a lateral opening 3; the rack 6 reciprocates along the direction vertical to the lateral opening 3 and can extend out of the lateral opening 3 in the door opening state; the driving motor 4 is an outer rotor brushless motor, the axial directions of the driving motor 4 and the gear transmission set 5 are both perpendicular to the end surface of the housing 1, where the end surface refers to the end surface of the housing 1 matched with the cover and also refers to the inner bottom surface 701 of the housing 1.

One end of the housing 1, which is located in the retraction direction of the rack 6 (i.e., the direction in which the rack 6 retracts into the housing 1), is provided with a shock absorption structure 7, the shock absorption structure 7 is a U-shaped structure with an opening facing the rack 6, and the width of the opening of the shock absorption structure 7 is slightly smaller than the width of the rack 6 located in the shock absorption structure 7.

The utility model discloses use the direction of rack 6 to the interior withdrawal of casing 1 to be the rear to the direction that rack 6 stretches out the motion when opening the door is the place ahead.

The driving motor 4 adopts an outer rotor brushless motor, and is directly meshed with the gear transmission set 5 through a vertical output shaft, so that the internal space of the shell 1 can be reduced, the output torque is increased, and the problem of low efficiency caused by worm and helical gear transmission is avoided. The outer rotor brushless motor has the advantages that the reduction ratio of the gear can be reduced due to the advantages of large output force arm, the rotating speed of the motor is lower under the same speed and torque, and the noise is low.

The U-shaped structural design of the damping structure 7 can increase the friction force on the two side faces of the rack 6 in the width direction, and the damping structure plays a role in returning and buffering, so that the rear end of the rack 6 is slowly contacted with the damping structure 7, the impact force is reduced, and the motion pause feeling is avoided.

When the door opening mechanism is in a door closing state, the rear end of the rack 6 is located in the damping structure 7, when the door needs to be opened, the driving motor 4 is started, the driving motor 4 drives the rack 6 to move towards the lateral opening 3 through the gear transmission assembly 5 until the rack 6 is in a completely extending state, and the returning of the rack 6 can be realized by adopting various modes such as manual pushing, reverse movement of the driving motor 4 or pulling of the reset spring 15.

Example one

As shown in fig. 1-5, a door opening mechanism of an outer rotor brushless motor refrigerator comprises a housing 1, a housing cover 2 covering the housing 1 to form a box body with a lateral opening 3, and a driving motor 4, a gear transmission set 5 and a rack 6 which are positioned in the box body and are sequentially engaged and driven; the lateral opening 3 in this embodiment is disposed on the housing 1, the cavity for accommodating the driving motor 4, the gear transmission set 5 and the rack 6 is also located in the housing 1, and the housing cover 2 is a plate-shaped structure covering the top of the housing 1. The rack 6 reciprocates along the direction vertical to the lateral opening 3 and can extend out of the lateral opening 3 in a door opening state; the driving motor 4 is an outer rotor brushless motor, and the axial directions of the driving motor 4 and the gear transmission set 5 are both vertical to the end surface of the shell 1. One end of the shell 1, which is located in the retraction direction of the rack 6, is provided with a damping structure 7, the damping structure 7 is a U-shaped structure with an opening facing the rack 6, and the width of the opening of the damping structure 7 is slightly smaller than the width of the rack 6 located in the damping structure 7. The shock-absorbing structure 7 is usually made of a material having a certain elasticity, such as rubber, and the rack 6 can expand the opening of the shock-absorbing structure 7 and enter the shock-absorbing structure 7 under the action of the restoring force when the rack 6 retracts.

As shown in fig. 1, positioning portions corresponding to the respective structures are provided in the housing 1: the device comprises a damping positioning part 8 for positioning the damping structure 7, a motor positioning part 9 for positioning the driving motor 4, a rack positioning rib 10 for positioning the rack 6, and a gear positioning column 11 for positioning gears of all stages in the gear transmission set 5.

As shown in fig. 7, the external rotor brushless motor generally includes a stator housing 401, a rotor housing 402, a motor output shaft 403, a stator core 404, a rotor magnetic ring 405, and a control board 406, the rotor magnetic ring 405, the rotor housing 402, and the motor output shaft 403 are fixedly connected, the rotor magnetic ring 405 is located inside the rotor housing 402, the stator housing 401, the control board 406, and the stator core 404 are fixedly connected, the control board 406 is located at one axial end of the stator housing 401, the motor output shaft 403 is rotatably connected with the stator housing 401 through a bearing 407, and the rotor magnetic ring 405 is located at the periphery of the stator core 404. The stator housing 401 mainly plays a role of fixedly mounting a motor, the rotor housing 402 is connected with the rotor magnetic ring 405 through interference fit with the motor output shaft 403, the motor output shaft 403 is in clearance connection with the bearing 407, and the bearing 407 is in interference connection with the stator housing 401. When the stator coils are energized, their magnetic fields interact with the rotor magnetic ring 405 on the outside thereof, generating an interaction force that causes the rotor to rotate. The motor output shaft 403 is provided with a driving gear 12 for meshing with the gear transmission set 5, and the driving gear may be in interference crimping or flat position matching. The drive motor 4 of the present embodiment is preferably a nine-slot six-pole outer rotor brushless motor.

The output of driving motor 4 is equipped with drive gear 12, gear transmission group 5 includes a plurality of gear sets 501, every group gear set 501 includes gear wheel and the pinion of coaxial setting, and the pinion in the gear set 501 of higher level meshes with the gear wheel in the gear set 501 of subordinate, and the external diameter of gear wheel is greater than the external diameter of pinion to reach the speed reduction effect. The gear transmission group 5 in this embodiment is composed of three-stage gear sets 501, three gear sets 501 are sequentially connected with the driving motor 4, a pinion of the last-stage gear set 501 is the output gear 502, the output gear 502 is connected with the rack 6, starting teeth 5021 (notch gear features are arranged on the output gear 502) are arranged on the output gear 502, strip-shaped teeth corresponding to the starting teeth 5021 on the output gear 502 are arranged on one side of the rack 6, the starting teeth 5021 of the output gear 502 can be meshed with the strip-shaped teeth 5026, and the circumferential length of the starting teeth 5021 is the stroke of the rack 6 in one-way motion.

The drive gear 12, the bull gear and the pinion in this embodiment are spur gears (as shown in fig. 1). The straight gear design avoids the problem of low efficiency caused by the transmission of the worm and the helical gear. The size of the output force arm is not considered, and the inner rotor and the direct-current brush motor can also realize straight-tooth transmission from the perspective of transmission efficiency, but the output force arms of the inner rotor and the direct-current brush motor are small, higher rotating speed is needed, noise is high, and the problem of noise reduction cannot be solved.

The linear motion of the rack 6 is realized by the structural limitation of the rack 6 and the shell 1, and the specific structure is shown in fig. 1: be equipped with rack location muscle 10 on

casing

1, 6 lower surfaces of rack are equipped with and supply rack location muscle 10 male constant head tank, and rack location muscle 10 extends towards 3 directions of side direction opening, and rack 6 cooperatees through constant head tank and rack location muscle 10 and connects on casing 1, and rack 6 can be along rack location muscle 10 linear motion to stretch out from side direction opening 3.

In this embodiment, a return spring 15 and a micro switch 13 located on one side of the rack 6 are arranged in the housing 1, one end of the return spring 15 is fixed to the rear end of the rack 6, the other end of the return spring is fixed to the housing 1 located behind the rack 6, a trigger bump 601 is arranged on one side of the rack 6 facing the micro switch 13, and when the rack 6 is in a completely pushed-out state, the trigger bump 601 contacts with the micro switch 13 to turn off the driving motor 4. The shell 1 is internally provided with a switch positioning part 14 for installing a microswitch 13, the rack 6 is provided with a convex structure connected with the front end of a return spring 15, and the rear end of the return spring 15 is connected with the shell 1. The microswitch 13 can transmit a signal to the driving motor 4 after being triggered, the microswitch 13 can be used as a circuit breaking element to directly act in a main driving loop of the driving motor 4, and can also be used as a signal element to send a signal to a main control board, and the main control board then carries out the power-off operation of the driving motor 4.

Reset spring 15 and shock-absorbing structure 7 laminate mutually, and the rear end of rack 6 sets up towards shock-absorbing structure 7, and when shock-absorbing structure 7 was kept away from to the rear end of rack 6, reset spring 15 was stretched, and when reset spring 15 shrink, shock-absorbing structure 7 can be stretched into to the rear end of rack 6, and shock-absorbing structure 7 can play absorbing effect. The damping structure 7 has an inner bottom surface 701 abutted to the rear end surface of the rack 6 and inner side surfaces 702 (shown in fig. 5) attached to two parallel side surfaces of the rack 6, the two inner side surfaces 702 can be planes and play a role in buffering, and the inner bottom surface 701 plays a role in limiting and has a certain damping function.

When the driving motor 4 rotates, the gear transmission set 5 transmits the rotation speed and the torque to the output gear 502 of the last gear set 501, the starting teeth 5021 on the output gear 502 are meshed with the strip-shaped teeth on the rack 6 to transmit the power to the rack 6, the rack 6 starts to move (as shown in fig. 3), the return spring 15 is stretched (as shown in fig. 4), gradually extends out from the lateral opening 3, and finally the door is knocked open (as shown in fig. 5). The rack 6 is constrained to move linearly by the housing 1 and the positioning of the rack 6 itself. The lower edge of the rack 6 is provided with a trigger bump 601, the microswitch 13 is provided with a pressing arm 1301, after the last tooth of the output gear 502 is meshed with the last tooth of the rack 6, the microswitch 13 is triggered, the driving motor 4 stops rotating, the rack 6 moves towards the damping structure 7 under the action of the resilience force of the return spring 15, and the rear end of the rack 6 can extend into the damping structure 7.

The motion process is as follows:

door opening movement: as shown in fig. 3, when the driving motor 4 rotates to drive the output gear 502 to rotate, the starting teeth 5021 of the output gear 502 are engaged with the rack teeth of the rack 6 in the retracted state (at this time, the rack 6 is pulled by the return spring 15 to be always attached to the shock pad), then the rack 6 moves linearly and gradually extends out from the lateral opening 3 (the movement path is limited by the positioning of the rack positioning rib 10 and the positioning groove on the housing 1 to ensure that the rack can extend out from the lateral opening 3), and finally the door is knocked open.

Door closing movement: as shown in fig. 5, after the last tooth of the output gear 502 stops meshing with the last tooth of the rack 6, the trigger bump 601 on the rack 6 presses the pressing arm 1301, at this time, the micro switch 13 is triggered, the driving motor 4 receives a stop signal, and the rack 6 is retracted by the pulling force of the return spring 15 and impacts on the shock absorbing structure 7.

Example two

The difference between this embodiment and the first embodiment is: the large gears in the driving gear 12 and the first-stage gear set 501 are both straight gears and helical gears, and although the transmission efficiency of helical gear transmission is lower than that of straight gears, helical gears are not easy to cause impact and vibration relative to straight gears, and the noise is low.

As shown in fig. 6 and 7, at the output shaft of the driving motor 4, a helical gear is installed, the driving gear 12 is fixed on the motor output shaft 403 by interference or flat position, on the gear engaged with it, the helical gear features with the same inclination and the same module, and the number of the helical gears in the gear transmission set 5 is larger than that of the helical gears on the motor output shaft 403.

Compared with a straight gear with the same size, the helical gear has a larger contact surface, and the contact between teeth is closer to sliding fit rather than impact fit of the straight gear, so that the effect of high strength and good noise is achieved.

EXAMPLE III

On the basis of the first embodiment or the second embodiment, as shown in fig. 4, the rear end surface of the rack 6 and two parallel side surfaces of the rack 6 are in rounded transition. This makes it easier for the toothed rack 6 to enter the interior of the damping structure 7 through its opening.

Example four

On the basis of the above embodiments, as shown in fig. 2 and 4, the inner side wall of the shock absorbing structure 7 has a plurality of grooves 703, so that the inner side surface 702 of the shock absorbing structure 7 forms a saw-tooth shape, thereby improving the buffering effect.

EXAMPLE five

On the basis of the above embodiment, the outer diameter of the stator housing 401 is larger than the outer diameter of the rotor housing 402, and the stator housing 401 is fixedly connected with the casing 1. This protects the rotating rotor from other parts.

Preferably, one or more hall chips for detecting the rotation speed of the rotor magnetic ring 405 are arranged on the control board 406. The control board 406 of this embodiment is provided with three hall chips, which can sense the rotation change of the rotor magnetic ring 405.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides an outer rotor brushless motor refrigerator mechanism of opening door which characterized in that: the gear box comprises a shell (1) and a shell cover (2), wherein the shell (1) and the shell cover (2) are covered to form a box body with a lateral opening (3), and the gear box also comprises a driving motor (4), a gear transmission group (5) and a rack (6) which are positioned in the box body and are sequentially meshed for transmission; the rack (6) reciprocates along the direction vertical to the lateral opening (3) and can extend out of the lateral opening (3) in the door opening state;

the driving motor (4) is an outer rotor brushless motor, and the axial directions of the driving motor (4) and the gear transmission set (5) are both vertical to the end surface of the shell (1);

one end of the shell (1) in the returning direction of the rack (6) is provided with a damping structure (7), the damping structure (7) is a U-shaped structure with an opening facing the rack (6), and the opening width of the damping structure (7) is slightly smaller than the width of the rack (6) in the damping structure (7).

2. The outer rotor brushless motor refrigerator door opening mechanism of claim 1, wherein: the shock absorption structure (7) is provided with an inner bottom surface (701) abutted against the rear end surface of the rack (6) and an inner side surface (702) attached to two parallel side surfaces of the rack (6).

3. The external rotor brushless motor refrigerator door opening mechanism of claim 2, wherein: and the rear end face of the rack (6) and two parallel side faces of the rack (6) adopt fillet transition.

4. The external rotor brushless motor refrigerator door opening mechanism of claim 1, wherein: the inner side wall of the shock absorption structure (7) is provided with a plurality of grooves (703).

5. The external rotor brushless motor refrigerator door opening mechanism of claim 1, wherein: the output of driving motor (4) is equipped with drive gear (12), gear drive group (5) include a plurality of gear sets (501), every group gear set (501) are including the gear wheel and the pinion of coaxial setting, the gear wheel meshing in pinion and subordinate gear set (501) in higher level gear set (501), just drive gear (12), gear wheel and pinion are the spur gear.

6. The outer rotor brushless motor refrigerator door opening mechanism of claim 1, wherein: the output of driving motor (4) is equipped with drive gear (12), gear drive group (5) include a plurality of gear sets (501), every group gear set (501) are including the gear wheel and the pinion of coaxial setting, the gear wheel meshing in pinion and subordinate gear set (501) in higher level gear set (501), the gear wheel in drive gear (12) and first order gear set (501) is the helical gear, and all the other gear wheels and pinions are the spur gear.

7. The external rotor brushless motor refrigerator door opening mechanism of claim 1, wherein: be equipped with reset spring (15) and micro-gap switch (13) that are located rack (6) one side in casing (1), the one end of reset spring (15) is fixed with the rear end of rack (6), and the other end is fixed with casing (1) that are located rack (6) rear, is equipped with to trigger bump (601) towards one side of micro-gap switch (13) on rack (6), when rack (6) is in the complete state of pushing out, trigger bump (601) and micro-gap switch (13) contact to make driving motor (4) close.

8. The outer rotor brushless motor refrigerator door opening mechanism of claim 1, wherein: the driving motor (4) comprises a stator casing (401), a rotor casing (402), a motor output shaft (403), a stator iron core (404), a rotor magnetic ring (405) and a control panel (406), the rotor magnetic ring (405), the rotor casing (402) and the motor output shaft (403) are fixedly connected, the stator casing (401), the control panel (406) and the stator iron core (404) are fixedly connected, the motor output shaft (403) is rotatably connected with the stator casing (401), and the rotor magnetic ring (405) is located on the periphery of the stator iron core (404).

9. The external rotor brushless motor refrigerator door opening mechanism of claim 8, wherein: the outer diameter of the stator casing (401) is larger than that of the rotor casing (402), and the stator casing (401) is fixedly connected with the shell (1).

10. The outer rotor brushless motor refrigerator door opening mechanism of claim 8, wherein: one or more Hall chips for detecting the rotating speed of the rotor magnetic ring (405) are arranged on the control plate (406); the drive motor (4) is a nine-slot six-pole brushless motor.