CN212671452U - Door opening structure and household appliance using same - Google Patents

Abstract

The utility model discloses a structure and use this domestic appliance who opens door structure open door, include: the output mechanism is matched and connected with the shell; the outer shell comprises a cover plate and a lower shell which are suitable for being covered and jointed to form a containing cavity; the output mechanism comprises a deflector rod arranged outside the accommodating cavity and a sector output gear which is matched and connected with the deflector rod to be suitable for driving the deflector rod to rotate; the fan-shaped output gear is arranged in the accommodating cavity; and a torsional spring is also arranged between the sector output gear and the lower shell. The utility model discloses can realize reducing domestic appliance's the thickness of the structure of opening the door and reduce the noise of use at this structure of opening the door return stroke in-process that resets.

Description

Door opening structure and household appliance using same

Technical Field

The utility model relates to an intelligence furniture technical field especially relates to a structure and use this domestic appliance who opens door structure open door.

Background

The refrigerator door body that uses all has the magnetism actuation device in order to realize abundant airtight, and to the opening of the refrigerator door body except can carrying out manual opening, more and more refrigerator brands still select to try electronic opening on the high-end model in order to realize the purpose of convenient operation.

Because the existence of magnetic attraction device, all need very big power to overcome magnetic attraction at the initial stage of opening the refrigerator door body, this section stroke is very big although the thrust that needs is very big, but the stroke is very short, consequently, the most ideal motor state of opening the door to such condition should be for moment big and slow in earlier stage, and later stage moment is little and fast.

Patent No. CN107906838A discloses a crank door opening mechanism. The crank door opening mechanism is found to be fast and output large torque at the moment when the crank extends out in practical use, but the gear transmission noise is very high in the idle state due to no load when the crank is in return stroke, and although the input voltage can be regulated in a control mode, the problem of overlong return stroke time can be caused. The traditional damping mechanism is bidirectional damping, and unidirectional damping (such as a unidirectional bearing and a damping gear) is high in cost, so that most of the traditional damping mechanism still adopts bidirectional damping based on the consideration of cost, and the bidirectional damping can generate part of moment loss in use. In addition, the last section output gear of the crank door opening mechanism disclosed in the patent is designed by adopting a full gear, is limited by the turning radius of the crank, and has high integral height and high cost under the same strength, wherein the height of the last section output gear can directly influence the height of the integral crank door opening mechanism, so that the occupancy rate of the crank door opening mechanism to the internal space of the refrigerator is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a structure of opening door to solve and realize reducing the thickness of the structure of opening the door and reduce its technical problem who resets the use noise of return stroke in-process.

A second object of the present invention is to provide a household appliance to solve the technical problem of reducing the thickness of the door opening structure in the household appliance and reducing the noise in the reset return stroke process.

The utility model discloses a structure of opening door realizes like this:

a door opening structure comprising: the device comprises an outer shell and an output mechanism matched and connected with the outer shell; wherein

The outer shell comprises a cover plate and a lower shell which are suitable for being covered and jointed to form a containing cavity;

the output mechanism comprises a deflector rod arranged outside the accommodating cavity and a sector output gear which is matched and connected with the deflector rod to drive the deflector rod to rotate; the fan-shaped output gear is arranged in the accommodating cavity; and

and a torsion spring is also arranged between the fan-shaped output gear and the lower shell.

In a preferred embodiment of the present invention, the sector output gear includes a base body coupled to the shift lever, and sector wings disposed on a circumferential side of the base body; wherein

The side walls of the fan-shaped wings are uniformly distributed with tooth shapes.

In a preferred embodiment of the present invention, the fan-shaped wing occupies not less than 1/4 of the circumferential angle of the base body.

In a preferred embodiment of the present invention, the lower housing is further provided with an assembling post for mating with the base;

a hollow cylindrical matching cavity is formed in the assembling column from the end face facing the cover plate and along the axial direction of the assembling column;

the end part of the base body, which is far away from the cover plate, is provided with a columnar matching part which is suitable for being inserted into the matching cavity; and

the torsion spring is arranged in the columnar matching cavity and sleeved on the circumferential outer side of the columnar matching part.

In a preferred embodiment of the present invention, the torsion spring includes a spiral body and a fixed arm integrally connected to one end of the spiral body; wherein

The spiral body is sleeved on the circumferential outer side of the columnar matching part, and the fixed arm is connected with the columnar matching cavity.

In a preferred embodiment of the present invention, a magnet element is further disposed on the fan-shaped wing; and

a Hall plate which is positioned above the fan-shaped wing and is suitable for detecting the position of the magnet element on the fan-shaped wing is also arranged in the accommodating cavity;

the Hall plate is provided with a first Hall element and a second Hall element which are used for sensing the magnet element;

the first hall element is adapted to sense the magnet element when the fan-shaped wing is in an initial position;

the second hall element is adapted to sense the magnet element when the fan-shaped wing is rotated to an end position.

In a preferred embodiment of the present invention, a start stop portion and an end stop portion are further disposed in the lower housing, and the start stop portion and the end stop portion are adapted to form a start position and an end position of the rotation of the sector output gear in a one-to-one correspondence manner.

In a preferred embodiment of the present invention, a sealing ring is further disposed between the base and the cover.

In a preferred embodiment of the present invention, the door opening structure further includes a torque transmission mechanism disposed in the accommodating cavity and connected to the sector output gear, and a power mechanism connected to the torque transmission mechanism.

The utility model discloses a domestic appliance realizes like this:

a household appliance comprising: the door opening structure.

By adopting the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses an output mechanism, structure of opening door and use this structure of opening door's domestic appliance, what adopt to being suitable for the rotatory end gear of driving lever is fan-shaped output gear, fan-shaped output gear compares the full gear, fan-shaped output gear is not only with low costs, and the radius of gyration that is restricted the driving lever in addition, under the same intensity, fan-shaped output gear can effectively utilize the inner space of structure of opening door to reduce holistic structure of opening door's thickness, and then reduce the occupancy of mechanism of opening door to the refrigerator inner space. In addition, be equipped with the torsional spring between fan-shaped output gear and lower casing, this torsional spring can form the one-way damping effect between fan-shaped output gear and the lower casing to the realization reduces the noise of opening the door structure at the return stroke in-process at low-cost prerequisite.

Secondly, for a deflector rod used for pushing the door body, the side end of the deflector rod suitable for contacting the door body is provided with a first force transmission end and a second force transmission end which are connected in a direct connection manner, so that the first force transmission end contacts the door body of the household appliance firstly in the process of pushing the door body by the deflector rod, the force arm is smaller at the moment and the rotating speed is low, and the moment is large when the force arm is small under the condition of the same torque, so that the door opening moment is larger at the moment, and the larger moment can overcome the magnetic attraction of the refrigerator door body in the first stage; when the magnetic attraction of the refrigerator door body in the first stage is overcome, the second force transmission end contacts the door body again, the force arm is large, and the rotating speed is high; therefore, the utility model discloses can realize just that the door body opens the big just slow speed of moment in the in-process earlier stage, little and fast user demand of later stage moment.

Drawings

Fig. 1 is a schematic view of a first viewing angle corresponding to the door opening structure of the present invention in an initial state;

fig. 2 is a schematic view of a second viewing angle corresponding to the door opening structure of the present invention in the initial state;

fig. 3 is an explosion diagram of the door opening structure of the present invention in an initial state;

fig. 4 is a schematic structural view of the lower casing of the door opening structure of the present invention in an initial state;

fig. 5 is a schematic structural view of the lower housing of the door opening structure of the present invention during the door opening process;

fig. 6 is a schematic view of the corresponding overall structure of the door opening structure of the present invention after the door body is opened;

fig. 7 is a schematic view of the corresponding internal structure of the door opening structure of the present invention after the door body is opened;

fig. 8 is a schematic view of the structure of the door opening structure of the present invention, which is a matching structure of the hall plate and the fan-shaped wing;

fig. 9 is a schematic view of a first viewing angle of the door opening structure of the present invention in a state where the hall plate is engaged with the sector output gear;

fig. 10 is a schematic view of a second viewing angle of the door opening structure of the present invention in a state where the hall plate is engaged with the sector output gear;

fig. 11 is a schematic view of a third viewing angle of the door opening structure of the present invention in a state where the hall plate is engaged with the sector output gear;

fig. 12 is a schematic view of the hall plate and the sector output gear of the door opening structure of the present invention in a state where the door body is closed;

fig. 13 is a schematic view of the engagement between the base body of the sector output gear and the torsion spring of the door opening structure of the present invention;

fig. 14 is a schematic structural view of the mounting post in the lower case of the door opening structure of the present invention;

FIG. 15 is an enlarged view of section A of FIG. 14;

fig. 16 is an exploded view of the base body of the sector output gear and the torsion spring of the door opening structure of the present invention;

fig. 17 is a cross-sectional view showing the engagement between the sector output gear, the torsion spring and the assembling post of the door opening structure of the present invention.

In the figure: the mechanical transmission device comprises a shifting lever 100, a first power transmission end 101, a second power transmission end 103, a sector output gear 200, a base body 201, a spline 2011, a sector wing 202, a cover plate 300, an L-shaped step part 303, a lower shell 400, an assembly column 402, a columnar matching cavity 403, a torsion spring slot 405, a motor 501, a worm 502, a multi-stage reduction gear 600, a Hall plate 700, a Hall plate assembly column 701, a first Hall element 703, a second Hall element 705, a columnar matching part 206, a spiral body 801, a fixed arm 803, a starting stop part 901, an end stop part 902, a sealing line group 1001 and a sealing ring 1002.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

Example 1:

referring to fig. 1 to 4, the present embodiment provides a door opening structure, including: the device comprises an outer shell and an output mechanism matched and connected with the outer shell. The outer housing includes a cover plate 300 and a lower housing 400 adapted to be brought into close engagement to form a receiving cavity. The output mechanism comprises a shift lever 100 and a sector output gear 200 which is matched and connected with the shift lever 100 and is suitable for driving the shift lever 100 to rotate; a torsion spring is further provided between the sector output gear and the lower housing 200. As the lever 100 rotates, one side end of the lever 100 rotatably engages the drawer or the door and pushes the drawer or the door open, which will be described below as an example of the case of pushing the door open.

The sector output gear 200 of the output mechanism is disposed in the accommodating cavity, and a portion of the sector output gear 200 coupled with the shift lever 100 penetrates through the cover plate 300 to connect with the shift lever 100 located outside the accommodating cavity. That is, the lever 100 is disposed outside the cover 300, and in consideration of compactness of the size of the entire door opening structure, an L-shaped step 303 may be optionally formed on the cover 300 to form an assembly space of the lever 100.

Of course, it should be noted that the door opening structure of the present embodiment further includes a torque transmission mechanism connected to the sector output gear 200 and disposed in the accommodating cavity, and a power mechanism connected to the torque transmission mechanism. The power mechanism is used for providing a power source and transmitting the output torque to the torque transmission mechanism, and the torque transmission mechanism transmits the torque to the sector output gear 200. The power mechanism can adopt a motor 501 and a worm 502 matched with the motor 501 to provide power, the motor 501 drives the worm 502 to rotate, and the worm 502 is connected with a torque transmission mechanism to realize torque transmission. The motor 501 may operate in forward or reverse rotation, depending on the circumstances. The torque transmission mechanism may be configured as a multi-stage reduction gear 600, and the embodiment of the multi-stage reduction gear 600 is not limited in any way. For the power mechanism and the torque transmission mechanism of the embodiment, when the power mechanism and the torque transmission mechanism are installed, the motor 501 and the multi-stage reduction gear 600 are positioned and installed through hole positions and/or slot positions and/or installation portions reserved on the lower shell 400, and the end of the worm 502 is provided with a worm 502 positioning sleeve assembling portion to relieve the abnormal sound vibration problem caused by the jumping of the worm 502 when the motor 501 runs at a high speed.

In an alternative embodiment, the shift lever 100 of this embodiment has a first power transmission end 101 and a second power transmission end 103 connected in series at a side end adapted to contact the door body; the first force transmission end 101 is closer to a rotation point of the shifting lever 100 than the second force transmission end 103, the first force transmission end 101 is connected with the second force transmission end 103 in a bending mode, a bending angle formed between the first force transmission end 101 and the second force transmission end 103 is an obtuse angle, the obtuse angle is designed so that the first force transmission end 101 contacts with a door body of the household appliance firstly, and the second force transmission end 103 contacts with the door body of the household appliance later in the process that the shifting lever 100 pushes the door body open. When the first force transmission end 101 contacts with the door body of the household appliance firstly, the first force transmission end 101 is closer to the rotation point of the deflector rod 100 than the second force transmission end 103, so that the moment arm is smaller and the rotation speed is low at the moment, and the moment arm is smaller and the moment is larger under the condition of the same torque, so that the opening moment is larger at the moment, and the larger moment can overcome the magnetic attraction of the refrigerator door body at the first stage; when the magnetic attraction of the refrigerator door body in the first stage is overcome, the second force transmission end 103 contacts the door body again, the force arm is large, and the rotating speed is high; therefore, the utility model discloses can realize just that the door body opens the big just slow speed of moment in the in-process earlier stage, little and fast user demand of later stage moment.

Taking an optional case as an example with reference to the drawings of the present embodiment, when the output mechanism of the present embodiment is applied to a door opening structure, for the shift lever 100, when the door body is in a closed state, the first force transmission end 101 of the shift lever may be approximately parallel to the door body.

In more detail, the sector output gear 200 includes a base 201 coupled to the shift lever 100, and a sector wing 202 disposed on a circumferential side of the base 201; the deflector rod 100 and the base 201 are fixed by bolts, and in consideration of the problem of sealing the accommodating cavity, the bolt holes for fixing the deflector rod 100 on the base 201 are blind holes. The side walls of the fan-shaped wings 202 are uniformly distributed with tooth shapes; and the fan-shaped wings 202 occupy no less than 1/4 of the circumferential angle of the base 201, that is, the fan-shaped wings 202 occupy no less than 90 of the circumferential angle. For the matching connection between the base 201 and the shift lever 100 of this embodiment, a polygonal shaft hole form or a spline form can be adopted for matching so as to transmit torque, which is not limited in this embodiment. Referring to the drawings of the present embodiment, in a spline form as an example, a spline 2011 is provided on the base 201, and a spline groove adapted to mate with the spline 2011 is provided at a portion of the shift lever 100 for mating with the base 201.

In order to better feed back the motion state of the shift lever 100 to the electrical control system of the door opening structure of the present embodiment, so as to correctly control the motor 501 to perform the forward rotation or reverse rotation operation, the rotation of the shift lever 100 of the present embodiment is implemented by the sector output gear 200, that is, the rotation state of the sector output gear 200 only needs to be detected in order to expect or the rotation state of the shift lever 100, and therefore, the rotation state of the shift lever 100 can be obtained by detecting the specific position of the sector wings 202 of the sector output gear 200. In an alternative case, for example, a magnet element is further disposed on the fan-shaped wing 202; and a hall plate 700 which is positioned above the fan-shaped wing 202 and is suitable for detecting the position of the magnet element on the fan-shaped wing 202 is also arranged in the accommodating cavity, and the hall plate 700 can be matched and connected with the lower shell 400 through a hall plate assembling column 701. A first hall element 703 and a second hall element 705 for sensing a magnet element are provided on the hall plate 700; when the fan-shaped wing 202 is at an initial position (which corresponds to a position where the door body is in a closed state, to be described), the first hall element 703 is adapted to sense the magnet element; when the fan-shaped wing 202 rotates to the end position (which corresponds to the position where the door is pushed open), the second hall element 705 is adapted to sense the magnet element.

When the door body is at the closing position, the fan-shaped wing 202 and the shift lever 100 are at the initial position, the magnet element on the fan-shaped wing 202 and the first hall element 703 on the hall plate 700 are at the position close to each other, the hall plate 700 transmits the signal that the shift lever 100 is at the initial position to the electrical control system, and the electrical control system commands the motor 501 to rotate forward to transmit power so as to drive the shift lever 100 and the fan-shaped wing 202 to rotate forward. As the toggle 100 and the fan-shaped wing 202 rotate, the magnet element on the fan-shaped wing 202 moves away from the first hall element 703. After the door body is opened, the shift lever 100 and the fan-shaped wing 202 are at the end position, and the magnet element on the fan-shaped wing 202 reaches a position close to the second hall element 705 on the hall plate 700. At this time, the hall plate 700 may transmit the lever 100 to the electrical control system as a signal for opening the door in place, and the electrical control system controls the motor 501 to stop operating or directly start the reverse rotation operation to retract the lever 100.

When the door body is at the end position, the fan-shaped wing 202 and the shift lever 100 are at the end position, the magnet element on the fan-shaped wing 202 and the second hall element 705 on the hall plate 700 are at the position close to each other, the hall plate 700 transmits the signal that the shift lever 100 is at the end position to the electrical control system, and the electrical control system commands the motor 501 to rotate reversely to transmit power so as to drive the shift lever 100 and the fan-shaped wing 202 to rotate reversely. As the toggle 100 and fan-shaped wing 202 rotate, the magnet element on the fan-shaped wing 202 moves away from the second hall element 705 until the magnet element on the fan-shaped wing 202 reaches a position proximate to the first hall element 703 on the hall plate 700. At this time, the hall plate 700 can transmit the stick 100 and the signal for returning the stick 100 and the fan-shaped wing 202 to the electric control system, and the electric control system controls the motor 501 to stop operating.

The lower shell 400 is also provided with a mounting column 402 which is used for matching and connecting with the base body 201; a hollow cylindrical fitting cavity 403 is formed in the fitting post 402 from an end surface facing the cover plate 300 and along the axial direction of the fitting post 402; the end of the base 201 facing away from the cover plate 300 is provided with a cylindrical fitting 206 adapted to be inserted into the fitting cavity; the torsion spring is disposed in the cylindrical fitting cavity 403 and surrounds the circumferential outer side of the cylindrical fitting portion 206.

Specifically, the torsion spring used in this embodiment includes a spiral body 801 and a fixing arm 803 integrally connected to one end of the spiral body 801; the spiral body 801 is sleeved on the outer side of the cylindrical mating portion 206 in the circumferential direction, the fixing arm 803 is connected to the cylindrical mating cavity 403, and a torsion spring slot 405 for inserting the fixing arm 803 is disposed in the cylindrical mating cavity 403. The spiral body 801 includes at least one coil, and generally, the number of the coil turns can be three to five, which is not limited in this embodiment.

It should be noted that the inner diameter of the torsion spring is smaller than the diameter of the cylindrical fitting portion 206, so that the spiral body 801 of the torsion spring is mounted on the cylindrical fitting portion 206 in an interference manner, and the fixed arm 803 of the torsion spring is inserted into the torsion spring slot 405 of the fitting column 402 of the lower housing 400, so that the torsion spring is in a stationary state relative to the lower housing 400.

When the rotation direction of the sector output gear 200 is the same as the rotation direction of the torsion spring, the torsion spring is influenced by the friction force and continuously receives the holding force, and the torsion spring continuously rubs against the columnar mating portion 206 of the sector output gear 200 to generate resistance. When the rotation direction of the sector output gear 200 is opposite to the rotation direction of the torsion spring, the torsion spring is continuously tensioned, the interference between the torsion spring and the cylindrical mating portion 206 of the sector output gear 200 is cancelled, and no resistance is generated in the rotation.

Specifically, in combination with the door opening structure of the present embodiment, the shift lever 100 can be set to spring counterclockwise and return clockwise, and at this time, a load needs to be added during the return, so the torsion direction of the torsion spring is clockwise. Of course, such a scheme can also be used: the toggle lever 100 is set to spring clockwise and return counterclockwise, and at this time, a load needs to be added during the return, so the torsion spring rotates counterclockwise.

Since the angle of the fan-shaped wing 202 in the circumferential direction of the present embodiment is not less than 90 °, specifically, taking the case of exactly 90 ° as an example, when the angle of the fan-shaped wing 202 in the circumferential direction is 90 °, the relative frictional rotation between the torsion spring and the cylindrical fitting portion 206 of the fan-shaped output gear 200 is also 90 °. If the torsion spring is disposed at the multi-stage reduction gear 600, the rotation angle of the multi-stage reduction gear 600 is 180 ° according to the conventional reduction ratio of 1:2, so that the relative frictional rotation between the torsion spring and the portion of the multi-stage reduction gear 600 contacting the torsion spring is also 180 °. Since the rotation angle is doubled, the life of the torsion spring disposed at the multi-stage reduction gear 600 is only half of the life disposed at the sector output gear 200 with the same material and size. In combination with the design experience of the conventional mechanism, the performance attenuation problem caused by the life loss must be considered, so that the torsion spring is arranged at the fan-shaped output gear 200 in the embodiment in the most reasonable design, and the torsion spring can form a one-way damping effect between the fan-shaped output gear 200 and the lower housing 400, thereby reducing the noise of the door opening structure in the return stroke process on the premise of low cost.

In addition, a start stop 901 and an end stop 902 adapted to form a start position and an end position of the rotation of the sector output gear 200 in a one-to-one correspondence manner are further provided in the lower housing 400 of the present embodiment. Here, the start stop 901 and the end stop 902 form a stop of the movement limit position of the fan-shaped output gear 200 in the movement tracks of the reverse rotation and the forward rotation, and may be used in combination with the hall plate 700 and the magnet element of the present embodiment, or may be used alone, so as to prevent the problem that the fan-shaped output gear 200 rotates excessively.

When the door opening structure of the present embodiment is applied to a household appliance such as the inside of a refrigerator, the motor 501 inside the refrigerator needs to satisfy the requirement of forced explosion prevention, and therefore, based on the consideration of this problem, the present embodiment is designed as follows:

first, the seal line group 1001 is provided at the outlet position of the lower case 400 of the door opening structure of the present embodiment, so that the entire structure of the door opening structure can be in a sealed state.

Secondly, because there is the running clearance between fan-shaped output gear 200 and lower casing 400 and the apron 300, still be equipped with sealing washer 1002 between base member 201 and apron 300, this sealing washer 1002 can overlap and establish on base member 201 to supplementary fixed and sealed, the design of sealing washer 1002 can effectively block that outside grease, steam or impurity enter into and hold the cavity.

Example 2:

on the basis of the door opening structure of embodiment 1, the present embodiment provides a household appliance using the door opening structure of embodiment 2.

The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims (10)

1. A door opening structure, comprising: the device comprises an outer shell and an output mechanism matched and connected with the outer shell; wherein

The outer shell comprises a cover plate and a lower shell which are suitable for being covered and jointed to form a containing cavity;

the output mechanism comprises a deflector rod arranged outside the accommodating cavity and a sector output gear which is matched and connected with the deflector rod to drive the deflector rod to rotate; the fan-shaped output gear is arranged in the accommodating cavity; and

and a torsion spring is also arranged between the fan-shaped output gear and the lower shell.

2. The door opening structure according to claim 1, wherein the fan-shaped output gear comprises a base body coupled with the shift lever, and fan-shaped wings provided on a circumferential side of the base body; wherein

The side walls of the fan-shaped wings are uniformly distributed with tooth shapes.

3. The door opening structure of claim 2 wherein said fan wings are at an angle of not less than 1/4 degrees relative to the circumference of said base.

4. The door opening structure according to any one of claims 2 or 3, wherein a fitting post for mating with the base is further provided on the lower case;

a hollow cylindrical matching cavity is formed in the assembling column from the end face facing the cover plate and along the axial direction of the assembling column;

the end part of the base body, which is far away from the cover plate, is provided with a columnar matching part which is suitable for being inserted into the matching cavity; and

the torsion spring is arranged in the columnar matching cavity and sleeved on the circumferential outer side of the columnar matching part.

5. The door opening structure according to claim 4, wherein the torsion spring comprises a spiral body and a fixing arm integrally connected to one end of the spiral body; wherein

The spiral body is sleeved on the circumferential outer side of the columnar matching part, and the fixed arm is connected with the columnar matching cavity.

6. The door opening structure of claim 2, wherein a magnet element is further provided on the fan-shaped wing; and

a Hall plate which is positioned above the fan-shaped wing and is suitable for detecting the position of the magnet element on the fan-shaped wing is also arranged in the accommodating cavity;

the Hall plate is provided with a first Hall element and a second Hall element which are used for sensing the magnet element;

the first hall element is adapted to sense the magnet element when the fan-shaped wing is in an initial position;

the second hall element is adapted to sense the magnet element when the fan-shaped wing is rotated to an end position.

7. The door opening structure according to claim 2, wherein a start stop portion and an end stop portion adapted to form a start position and an end position of the rotation of the sector output gear in one-to-one correspondence, respectively, are further provided in the lower case.

8. The door opening structure according to claim 2, wherein a gasket is further provided between the base body and the cover plate.

9. The door opening structure of claim 1, further comprising a torque transfer mechanism disposed within the receiving cavity and coupled to the sector output gear, and a power mechanism coupled to the torque transfer mechanism.

10. A household appliance, characterized in that it comprises: a door opening structure as claimed in any one of claims 2 to 9.

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