CN110857745A

CN110857745A - Footing structure and household appliance with same

Info

Publication number: CN110857745A
Application number: CN201810968181.5A
Authority: CN
Inventors: 于鉴明; 李成君; 张林娟; 刘永龙
Original assignee: Qingdao Haier Multimedia Co Ltd
Current assignee: Haier Smart Home Co Ltd; Qingdao Haier Multimedia Co Ltd
Priority date: 2018-08-23
Filing date: 2018-08-23
Publication date: 2020-03-03
Anticipated expiration: 2038-08-23
Also published as: CN110857745B

Abstract

The invention discloses a bottom foot structure and a household appliance with the same, and belongs to the technical field of household appliances. The footing structure comprises a footing, a first adjusting knob, a first gear and a first transmission device; the bottom foot comprises a threaded part and a foot pad part which are connected with each other, wherein the foot pad part is positioned below a bottom shell of the household appliance and is used for supporting the household appliance; the thread part is vertical to the foot pad part and is positioned inside the household appliance; the first adjusting knob is rotatably arranged on the side part of the household appliance; the first gear is arranged on the first adjusting knob and is driven by the first adjusting knob to rotate; the first transmission device comprises a lead screw gear, and the lead screw gear is sleeved on the threaded part and is meshed with the first gear; the first adjusting knob drives the first gear and the screw rod gear to rotate under the action of external force, so that the threaded portion moves close to or away from a bottom shell of the household appliance, the foot pad portion is driven to move correspondingly, and during leveling, an external tool is not needed, and the leveling is simple and easy to implement.

Description

Footing structure and household appliance with same

Technical Field

The invention relates to the technical field of household appliances, in particular to a bottom foot structure and a household appliance with the same.

Background

Domestic appliance among the prior art, when adjusting the footing like refrigerator, TV, generally need lift up domestic appliance the back and rotate the footing, put down domestic appliance after the adjustment and carry out the level inspection, if improper then need adjust once more, so relapse many times, highly suitable until the footing reaches the purpose that the domestic appliance level was placed, and above-mentioned step often can not realize one-man operation to waste time and energy when adjusting, efficiency is lower.

Disclosure of Invention

The embodiment of the invention provides a bottom foot structure and a household appliance with the same, and aims to solve the problem that in the prior art, the adjustment of the bottom foot structure wastes time and labor. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

According to a first aspect of embodiments of the present invention, there is provided a foot structure applied to a household appliance, the foot structure comprising a foot, a first adjusting knob, a first gear and a first transmission device;

the bottom foot comprises a threaded part and a foot pad part which are connected with each other, wherein the foot pad part is positioned below a bottom shell of the household appliance and is used for supporting the household appliance;

the thread part is vertical to the foot pad part and is positioned inside the household appliance;

the first adjusting knob is rotatably arranged on the side part of the household appliance;

the first gear is arranged on the first adjusting knob and is driven by the first adjusting knob to rotate;

the first transmission device comprises a screw rod gear, and the screw rod gear is sleeved on the threaded part and is in meshed connection with the first gear;

the first adjusting knob drives the first gear and the screw rod gear to rotate under the action of external force in the horizontal direction, so that the threaded portion moves close to or away from a bottom shell of the household appliance, and the foot pad portion is driven to move correspondingly.

In some alternative embodiments, the foot further comprises a rotation stop portion connecting the threaded portion and the foot portion;

a bottom mounting hole is formed in the bottom shell;

the rotation stopping part penetrates through the bottom foot mounting hole and is in assembly connection with a bottom shell of the household appliance through the bottom foot mounting hole.

In some alternative embodiments, the rotation stop portion is non-circular in cross-section and has a shape and size that is compatible with the shape and size of the foot mounting hole.

In some alternative embodiments, the first transmission further comprises a first gear set;

the first gear set is connected with the first gear and the screw rod gear, and transmits the rotation of the first gear to the screw rod gear, so that the thread part generates linear motion in the vertical direction.

In some optional embodiments, the foot structure further comprises a support fixedly connected to a bottom shell of the household appliance, supporting the lead screw gear.

In some optional embodiments, the lead screw gear comprises a rotating part and a mounting part, the rotating part is meshed with the first gear set, the mounting part is fixed on the rotating part and forms an annular groove with the rotating part, and the mounting part of the bracket is located in the annular groove.

A footing structure is applied to a household appliance and comprises a footing, a second adjusting knob and a second transmission device;

the bottom foot comprises a rod part and a foot pad part which are connected with each other, wherein the foot pad part is positioned below a bottom shell of the household appliance and is used for supporting the household appliance;

the rod part is vertical to the foot pad part and is positioned inside the household appliance, and a plurality of teeth are formed on the rod part along the length direction of the rod part;

the second adjusting knob is rotatably arranged at the side part of the household appliance, and a second gear is arranged on the surface or in the axial direction of the second adjusting knob;

the second transmission device is connected with the rod part and the second gear;

the second adjusting knob drives the second transmission device under the action of external force, so that the rod part moves close to or away from the bottom shell of the household appliance, and the foot pad part is driven to move correspondingly.

In some alternative embodiments, the second transmission comprises a second gear set, a worm wheel, and a worm gear on the worm;

the second gear set is connected with the worm gear and the second gear;

the worm wheel is arranged in the household appliance, is in transmission connection with the worm and is meshed with the teeth of the rod part;

the second adjusting knob drives the worm gear and the worm connected with the second gear set to rotate through the second gear set under the action of external force, and the worm drives the worm wheel to rotate, so that the rod part generates linear motion in the vertical direction.

In some alternative embodiments, the second transmission comprises a third gear set and a third gear, wherein the third gear set connects the third gear and the second gear;

the third gear is connected with the rod part and the third gear set and is meshed with the teeth of the rod part;

the second adjusting knob rotates under the action of external force to drive the third gear set and the third gear to rotate, so that the rod part moves in the vertical direction.

According to a second aspect of embodiments of the present invention, there is provided a household appliance having the above foot structure.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a footing structure applied to household appliances, which comprises a footing, a first adjusting knob and a first transmission device, wherein the footing is provided with a first adjusting knob; the bottom foot comprises a threaded part and a foot pad part which are connected with each other, wherein the foot pad part is positioned below a bottom shell of the household appliance and is used for supporting the household appliance; the thread part is vertical to the foot pad part and is positioned inside the household appliance; the first adjusting knob is rotatably arranged on the side part of the household appliance, and a first gear is axially connected with the first adjusting knob; the first transmission device comprises a lead screw gear, and the lead screw gear is sleeved on the threaded part and is meshed with the first gear; under the action of external force in the horizontal direction, the first adjusting knob drives the first gear and the first transmission device to rotate, so that the threaded portion moves close to or away from a bottom shell of the household appliance, and the foot pad portion is driven to move correspondingly.

According to the embodiment of the invention, the first adjusting knob and the first transmission device are arranged, wherein the first transmission device comprises the lead screw gear, the first gear and the lead screw gear are driven to rotate by the first adjusting knob, so that the threaded part moves close to or far away from the bottom shell of the household appliance, the height between the foot part of the pad and the bottom shell is adjusted, the household appliance is leveled, the first adjusting knob only needs to be rotated, an external tool does not need to be used, and the household appliance is simple and convenient to use and high in practicability.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic illustration of a footing structure in accordance with an exemplary embodiment;

FIG. 2 is a cross-sectional schematic view of a rotation stop shown in accordance with an exemplary embodiment;

FIG. 3 is a cross-sectional schematic view of a rotation stop shown in accordance with another exemplary embodiment;

FIG. 4 is a cross-sectional schematic view of a rotation stop shown in accordance with yet another exemplary embodiment;

FIG. 5 is a cross-sectional schematic view of a rotation stop shown in accordance with yet another exemplary embodiment;

FIG. 6 is a cross-sectional schematic view of a stent shown in accordance with an exemplary embodiment;

FIG. 7 is a schematic diagram of a lead screw gear according to an exemplary embodiment;

FIG. 8 is a schematic structural view of a lead screw gear shown in accordance with another exemplary embodiment;

FIG. 9 is a schematic structural view of a lead screw gear shown in accordance with yet another exemplary embodiment;

FIG. 10 is a schematic view of a mounting structure of a first adjustment knob shown in accordance with an exemplary embodiment;

FIG. 11 is a schematic view of a mounting structure of a first adjustment knob shown in accordance with another exemplary embodiment;

FIG. 12 is a schematic view of a mounting structure of a first adjustment knob shown in accordance with yet another exemplary embodiment;

FIG. 13 is a structural schematic of a footing structure shown in another exemplary embodiment;

FIG. 14 is a structural schematic of a footing structure in accordance with yet another exemplary embodiment;

description of the drawings:

1. footing; 11. a threaded portion; 12. a rotation stop section; 13. a foot pad part; 14. a rod portion; 2. a first adjustment knob; 21. a first gear; 3. a support; 31. a fixed part; 311. a fixing hole; 32. an installation part; 321. mounting holes; 33. a support bar; 4. a bottom case; 41. a footing mounting hole; 5. a side casing; 51. a groove; 6. a first gear set; 7. a lead screw gear; 71. a rotating part; 72. an assembling portion; 73. a first bearing; 8. a second gear set; 9. a worm; 91. a worm gear; 10. a worm gear; 15. a second adjustment knob; 151. a second gear; 152. a second bearing; 16. a third gear set; 17. a third gear; 18. a damper; 19. a height limiter.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or structure from another entity or structure without requiring or implying any actual such relationship or order between such entities or structures. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

According to a first aspect of embodiments of the present invention, there is provided a foot structure for a household appliance, fig. 1 is a schematic structural diagram of a foot structure according to an exemplary embodiment, as shown in fig. 1, the foot structure includes a foot 1, a first adjusting knob 2 and a first transmission device; the foot comprises a threaded part 11 and a foot rest part 13 which are connected with each other, wherein the foot rest part 13 is positioned below the bottom shell 4 of the household appliance and is used for supporting the household appliance; the threaded part 11 is vertical to the foot rest part 13 and is positioned inside the household appliance; the first adjusting knob 2 is rotatably arranged on the side part of the household appliance, and the axial direction of the first adjusting knob 2 is connected with a first gear 21; the first transmission device comprises a lead screw gear 7, the lead screw gear 7 is sleeved on the thread part 11 and is meshed with the first gear 21; the first adjusting knob 2 drives the first gear 21 and the lead screw gear 7 to rotate under the action of external force, so that the threaded portion 11 moves close to or away from the bottom shell 4 of the household appliance, and the pad foot portion 13 is driven to move correspondingly.

According to the embodiment of the invention, the first adjusting knob 2 and the first transmission device are arranged, wherein the first transmission device comprises the lead screw gear 7, the first gear 21 and the lead screw gear 7 are driven to rotate by the first adjusting knob 2, so that the threaded part 11 moves close to or far away from the bottom shell 4 of the household appliance, the height between the foot part 13 of the pad and the bottom shell 4 is adjusted, the household appliance is leveled, only the first adjusting knob 2 needs to be rotated, no external tool is needed, the operation is simple, and the practicability is high.

In some alternative embodiments, the foot 1 further comprises a rotation stop portion 12 connecting the threaded portion 11 and the foot rest portion 13;

a footing mounting hole 41 is formed on the bottom shell 4;

the rotation stopper 12 passes through the foot mounting hole 41 and is assembled with the bottom case 4 of the home appliance through the foot mounting hole 41.

In alternative embodiments, the rotation stop 12 is non-circular in cross-section and is shaped and sized to fit the shape and size of the foot mounting hole 41.

Fig. 2 is a schematic cross-sectional view illustrating a rotation stopper according to an exemplary embodiment, and as shown in fig. 2, the rotation stopper 12 has an arcuate cross-section to prevent the rotation stopper 12 from rotating.

Fig. 3 is a schematic cross-sectional view of a rotation stopper according to another exemplary embodiment, and as shown in fig. 3, the rotation stopper 12 has a rectangular cross-section to prevent the rotation stopper 12 from rotating.

Fig. 4 is a schematic cross-sectional view illustrating a rotation stopper according to still another exemplary embodiment, and as shown in fig. 4, the rotation stopper 12 has an elliptical cross-section to prevent the rotation stopper 12 from rotating.

Fig. 5 is a schematic cross-sectional view illustrating a rotation stopper according to still another exemplary embodiment, and as shown in fig. 5, the rotation stopper 12 has a circular cross-section with a protrusion to prevent the rotation stopper 12 from rotating.

In some optional embodiments, the first transmission device further comprises a first gear set 6, the first gear set 6 connects the first gear 21 and the lead screw gear 7, and transmits the rotation of the first gear 21 to the lead screw gear 7, so that the threaded portion 11 generates a linear motion in a vertical direction.

In some alternative embodiments, the footing structure further comprises a support 3, the support 3 being fixedly connected to a bottom shell 4 of the household appliance, supporting the lead screw gear 7.

Fig. 6 is a schematic cross-sectional view of a bracket according to an exemplary embodiment, as shown in fig. 6, the bracket 3 includes a fixing portion 31, the fixing portion 31 has a fixing hole 311, the number of the fixing holes 311 is at least 2, the fixing holes are distributed on the periphery of the bracket 3, and the bracket 3 can be fixed on the bottom case 4 by screws from the fixing holes 311;

the bracket 3 further comprises a mounting portion 32 and a support rod 33, wherein the support rod 33 connects the fixing portion 31 and the mounting portion 32, and the support rod 33 is used for limiting the height of the foot 1.

In some alternative embodiments, the mounting portion 32 is provided with a mounting hole 321, and the mounting hole 321 is located at the center of the mounting portion and is used for mounting the lead screw gear 7.

By providing the bracket 3 and fixing the bracket 3 to the bottom case 4, the lead screw gear 7 can be stably provided to the bracket 3.

Fig. 7 is a schematic structural view illustrating a lead screw gear according to an exemplary embodiment, and as shown in fig. 7, the lead screw gear 7 includes a rotating portion 71 and a fitting portion 72, the rotating portion 71 is engaged with the first gear set 6, and the fitting portion 72 is fixed to the rotating portion 71 and forms an annular groove with the rotating portion 71, and the mounting portion 32 of the bracket 3 is located in the annular groove.

The contact surface between the rotating part 71 and the assembling part 72 is a plane, and can be fixed by a screw, or by glue or welding.

Fig. 8 is a schematic structural view of a lead screw gear according to another exemplary embodiment, and as shown in fig. 8, both the fitting portion 72 and the rotating portion 71 are formed with threads, whereby the fitting portion 72 and the rotating portion 71 are connected by threads.

The rotation portion 71 is screwed into the fitting portion 72, and an anti-loosening rubber or a spring washer may be added to the screw thread to prevent loosening.

Fig. 9 is a schematic structural view of a lead screw gear according to still another exemplary embodiment, and as shown in fig. 9, in some alternative embodiments, the lead screw gear 7 further includes a first bearing 73, and the first bearing 73 is a thrust bearing, and both ends in the axial direction thereof are respectively disposed on the mounting portion 72 and the mounting portion 32 of the bracket 3.

Through the first bearing 73, the stress between the screw gear 7 and the bracket 3 can be improved, so that the rotation of the rotating part 71 is smoother.

Fig. 10 is a schematic view illustrating a mounting structure of the first adjustment knob according to an exemplary embodiment, and as shown in fig. 10, the rotation shaft of the first adjustment knob 2 and the rotation shaft of the first gear 21 are rotatably provided in the side case 5, and one axial ends of the rotation shaft of the first adjustment knob 2 and the rotation shaft of the first gear 21 are in contact with the side case 5, so that the first adjustment knob 2 can be firmly fixed to the inside of the side case 5, and vertical shaking is prevented from occurring.

Fig. 11 is a schematic view showing a mounting structure of the first adjustment knob according to another exemplary embodiment, and as shown in fig. 11, the rotation shaft of the first adjustment knob 2 and the rotation shaft of the first gear 21 are both passed through the side case 5 and rotatably provided in the side case 5 so that the first adjustment knob 2 can be firmly fixed to the inside of the side case 5 with a certain adjustment space in a vertical direction.

Fig. 12 is a schematic view illustrating a mounting structure of the first adjustment knob according to still another exemplary embodiment, and as shown in fig. 12, the second bearing 152 is provided on the rotation shaft of the first adjustment knob 2 and the rotation shaft of the first gear 21, and by the second bearing 152 being rotatably provided in the side case 5, the rotation of the first adjustment knob 2 and the first gear 21 can be made smoother.

Of course, the above structure is not only applicable to the first adjustment knob 2, but also when the second adjustment knob 15 is similarly mounted.

In some alternative embodiments, a groove 51 is provided on the side casing 5 of the household appliance, and the first adjustment knob 2 or the second adjustment knob 15 is mounted in the groove 51.

Through set up recess 51 on side shell 5, can make the user realize carrying out the adjustment of height, labour saving and time saving, and height control convenient and fast to footing 1 through operation first adjust knob 2 or second adjust knob 15 from domestic appliance's side.

In some alternative embodiments, the end of the threaded portion 11 is further provided with a drop-off prevention device for preventing the lead screw gear 7 from dropping off from the threaded portion 11.

In some optional embodiments, the falling off prevention means includes a stopper rod vertically disposed at the end of the threaded part 11 and perpendicular to the threaded part 11.

In some alternative embodiments, the fall-off preventing means includes a locknut, and the lead screw gear 7 is prevented from falling off by fixedly mounting the locknut to the end of the threaded portion 11.

In some alternative embodiments, the dropout prevention means comprises a stop pin located at the end of the threaded portion 11 and passing through the cross section of the threaded portion 11.

By providing the anti-drop means, the lead screw gear 7 can be prevented from dropping off from the threaded portion 11 when the height of the foot 1 is adjusted.

FIG. 13 is a schematic structural view of a foot structure, as shown in FIG. 13, including a foot 1, a second adjustment knob 15 and a second transmission, according to another exemplary embodiment;

the footing 1 comprises a rod part 14 and a foot rest part 13 which are connected with each other, wherein the foot rest part 13 is positioned below a bottom shell 4 of the household appliance and is used for supporting the household appliance;

the lever 14 is perpendicular to the footrest 13 and is positioned inside the home appliance, and the lever 14 is formed with a plurality of teeth along a length direction thereof;

the second adjusting knob 15 is rotatably installed at a side portion of the household appliance, and a second gear 151 is provided on a surface or in an axial direction thereof;

the second transmission connects the lever portion 14 and the second gear 151;

the second adjusting knob 15 drives the second transmission device under the action of external force, so that the rod part 14 moves close to or away from the bottom shell 4 of the household appliance, and the pad foot part 13 is driven to move correspondingly, so that the height between the pad foot part 13 and the bottom shell 4 is adjusted, and the household appliance is leveled.

In some alternative embodiments, the second transmission comprises the second gear set 8, the worm 9, the worm wheel 10 and a worm gear 91 on the worm 9;

the second gear set 8 connects the worm gear 91 and the second gear 151;

the worm wheel 10 is arranged in the household appliance, is in transmission connection with the worm 9 and is meshed with the teeth of the rod part 14;

the second adjusting knob 15 drives the worm gear 91 and the worm 9 connected with the second gear set 8 to rotate through the second gear set 8 under the action of external force, and the worm 9 drives the worm wheel 10 to rotate, so that the rod part 14 generates linear motion in the vertical direction.

Wherein the second adjusting knob 15 is rotated in a horizontal plane by an external force, and the rotation has two directions, namely, the front or back direction of the household appliance.

In some alternative embodiments, a height limiter 19 is disposed on the upper portion of the worm 9, and the height limiter 19 is sleeved on the worm 9 to limit the rotation of the worm wheel 10.

FIG. 14 is a structural schematic view of a foot structure shown in yet another exemplary embodiment, and as shown in FIG. 14, the second transmission includes a third gear set 16 and a third gear 17, wherein the third gear set 16 connects the third gear 17 and a second gear 151;

a third gear 17 connects the lever 14 and the third gear set 16 and meshes with the teeth of the lever 14;

the second adjusting knob 15 rotates under the action of external force, drives the third gear set 16 to rotate, and drives the third gear 17 to rotate, so that the rod part 14 moves in the vertical direction.

Wherein the second adjusting knob 15 is rotated in a vertical plane by an external force, and the rotation has two directions, i.e. upward or downward rotation.

In some alternative embodiments, the second actuator further comprises a damper 18, the damper 18 being mounted on the rotation shaft of the second adjustment knob 15 to prevent the second adjustment knob 15 from rotating under the weight of the household appliance.

In some alternative embodiments, the gear ratio of the first gear set 6, the second gear set 8, or the third gear set 16 ranges from 1: 5-10: 1, wherein for the gear train with the transmission ratio more than 1, the movement of the footing can be driven by small external force, and for the gear train with the transmission ratio less than 1, the height adjustment of the footing 1 can be realized rapidly.

In some alternative embodiments, the transmission ratio of the first gear set 6 may range from 1:4 to 8:1, or may be a specific value, such as 1: 2.

In some optional embodiments, the transmission ratio of the second gear set 8 ranges from 1:3 to 6:1, and may also be a specific value, such as 3: 1.

in some alternative embodiments, the gear ratio of the third gear set 16 can range from 1:2 to 5:1, or can be a specific value, such as 2: 1.

Of course, the value ranges of the transmission ratios of the first gear set 6, the second gear set 8 and the third gear set 16 mentioned above can be replaced with each other, and a suitable transmission ratio is selected according to the maximum movable height of the foot, and considering that the foot is mainly used for leveling the household appliance, the maximum movable height is not necessarily too large, such as 5-20mm, and the transmission ratio of the gear set can be larger than 1, which is more important for the purpose of saving labor.

According to a second aspect of embodiments of the present invention, there is provided a household appliance having an upper foot structure mounted at a bottom of the household appliance.

The present invention is not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A foot structure is applied to a household appliance and is characterized by comprising a foot, a first adjusting knob, a first gear and a first transmission device;

the threaded part is perpendicular to the foot pad part and is positioned inside the household appliance;

the first adjusting knob drives the first gear and the lead screw gear to rotate under the action of external force in the horizontal direction, so that the threaded portion moves close to or away from a bottom shell of the household appliance, and the foot pad portion is driven to move correspondingly.

2. A footing structure according to claim 1, wherein the footing further includes a rotation stop portion connecting the threaded portion and the foot portion;

a bottom foot mounting hole is formed in the bottom shell;

the rotation stopping part penetrates through the bottom foot mounting hole and is assembled and connected with a bottom shell of the household appliance through the bottom foot mounting hole.

3. A foot structure according to claim 2, characterised in that said rotation stop is non-circular in cross-section and is shaped and dimensioned to fit the shape and size of said foot mounting hole.

4. A footing structure according to claim 1, wherein said first transmission further includes a first gear set;

the first gear set is connected with the first gear and the lead screw gear, and transmits the rotation of the first gear to the lead screw gear, so that the thread part generates linear motion in the vertical direction.

5. A foot structure according to claim 4, characterized in that it further comprises a bracket fixedly connected to a bottom shell of said household appliance, supporting said lead screw gear.

6. A foot structure according to claim 5, characterized in that the lead screw gear includes a rotating portion and a fitting portion, the rotating portion is engaged with the first gear set, the fitting portion is fixed to the rotating portion and forms an annular groove with the rotating portion, and the mounting portion of the bracket is located in the annular groove.

7. A foot structure is applied to household appliances and is characterized by comprising a foot, a second adjusting knob and a second transmission device;

the rod part is perpendicular to the foot pad part and is positioned inside the household appliance, and a plurality of teeth are formed on the rod part along the length direction of the rod part;

the second adjusting knob is rotatably arranged on the side part of the household appliance, and a second gear is arranged on the surface or in the axial direction of the second adjusting knob;

8. A foot construction according to claim 7, characterised in that said second transmission means comprises a second gear set, a worm wheel and a worm gear on said worm;

the second gear set is connected with the worm gear and the second gear;

the second adjusting knob drives the worm gear connected with the second gear set and the worm to rotate through the second gear set under the action of external force, and the worm drives the worm wheel to rotate, so that the rod part generates linear motion in the vertical direction.

9. A foot structure according to claim 7, characterised in that the second transmission means comprises a third gear set and a third gear, wherein the third gear set connects the third gear and the second gear;

10. A household appliance, characterized in that it has a foot construction according to any one of claims 1-9.