Door opening device and household appliance

Abstract

The invention belongs to the technical field of household appliances, and discloses a door opening device and a household appliance. According to the door opening device, an ejector rod is slidably connected to a shell and can move between the door opening position extending out of the shell and the door closing position contracting into the shell, the ejector rod is sequentially provided with a first rack belt and a second rack belt in the sliding direction of the ejector rod, and the first rack belt and the second rack belt both extend in the sliding direction of the ejector rod; the reduction gear set is installed on the shell, the output end of the reduction gear set is meshed with the first gear and the second gear, the reduction ratio of the reduction gear set relative to the first gear is larger than that of the reduction gear set relative to the second gear, and gear shafts of the first gear and the second gear are rotationally connected to the shell. The driving assembly is installed on the shell and is configured to be capable of driving the reduction gear set to operate, so that when the second gear and the second rack are meshed with each other, the second gear and the second rack are prevented from being clamped, and reliable operation of the door opening device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a door opening device and a household appliance. BACKGROUND

[0002] For a household appliance with a cabinet and an appliance door, such as a refrigerator, a washing machine, an intelligent bookshelf or an intelligent storage cabinet, a user needs to open the appliance door to take out or put in an article from or into the cabinet. When the user's hands are stained and touch the door body, the appliance door will be stained with the stains. For example, the user's hands are stained with flour during the process of kneading dough, and the user needs to open the refrigerator door to take out eggs. When the user holds an article, the user cannot even open the door body. For example, the user holds a washing basin with both hands and needs to open the door of the washing machine to put in clothes to be washed. Therefore, an automatic door opening device is often provided to enable the user to easily open the appliance door.

[0003] In the prior art, a sensor is often provided to detect whether the user makes a specific door opening action, and a door opening device is provided to automatically open the appliance door. For example, the user triggers a photoelectric sensor, and a top rod of the door opening device pushes open the appliance door to make the appliance door rotate relative to the cabinet. In order to make the appliance door have a large pushing force when it is initially opened to overcome the magnetic attraction between the magnetic door seal of the appliance door and the cabinet and enable the appliance door to be quickly opened, two pairs of gears and two racks with different diameters are often provided. The two racks are both installed on the top rod. When the appliance door is opened, the gear with a smaller diameter of the two pairs of gears rotates to drive the first rack to move, so that the top rod has a large pushing force to overcome the magnetic attraction between the magnetic door seal and the cabinet. Then, the gear with the smaller diameter of the two pairs of gears is disengaged from the first rack, and the gear with a larger diameter of the two pairs of gears is engaged with the second rack and moves the second rack, so that the top rod has a faster moving speed and the appliance door rotates quickly to open the appliance door. However, during the process of opening and closing the appliance door, the top rod needs to move back and forth, the gear with the larger diameter of the two pairs of gears needs to repeatedly engage and disengage with the second rack, and the moving speed of the second rack is greater than that of the first rack. When the gear with the larger diameter of the two pairs of gears is about to engage with the second rack, the first transmission tooth of the second rack is likely to interfere with the transmission tooth of the gear and be caught, which reduces the reliability of the door opening device.

[0004] Therefore, there is an urgent need for a door opening device and a household appliance to solve the above problems. SUMMARY

[0005] The present application aims to provide a door opening device and a household appliance, which can prevent the rack and the gear from being caught when the gear and the rack engage with each other, and ensure the reliable operation of the door opening device.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, a door opening device is provided, characterized in that it includes:

[0008] case;

[0009] A push rod is slidably connected to the housing and can move between an open position extending out of the housing and a closed position retracted inside the housing. The push rod is provided with a first rack and a second rack in sequence along its sliding direction. Both the first rack and the second rack extend along the sliding direction of the push rod.

[0010] The transmission assembly includes a first gear, a second gear, and a reduction gear set. The reduction gear set is mounted on the housing and its output end meshes with both the first gear and the second gear. The reduction ratio between the reduction gear set and the first gear is greater than the reduction ratio between the reduction gear set and the second gear. The gear shafts of the first gear and the second gear are rotatably connected to the housing.

[0011] A drive assembly, which is mounted on the housing and configured to drive the reduction gear set;

[0012] When the push rod is in the closed position, the first gear meshes with the first rack belt, and the reduction gear set drives both the first gear and the second gear to rotate in the forward direction. The forward rotation of the first gear causes the push rod to move from the closed position to the open position. When the first gear disengages from the first rack belt, the second gear begins to mesh with the second rack belt to drive the push rod to continue moving towards the open position. The peripheral sidewall of the second gear is provided with a plurality of continuously arranged transmission teeth and a second toothed section without transmission teeth. When the second gear begins to mesh with the second rack belt, the first transmission tooth of the second rack belt is opposite to the second toothed section.

[0013] In some embodiments, when the push rod is in the open position, the second gear meshes with the second rack belt, and the reduction gear set drives the first gear and the second gear to rotate in opposite directions. The second gear rotates in opposite directions, causing the push rod to move from the open position to the closed position. When the second gear disengages from the second rack belt, the first gear begins to mesh with the first rack belt to drive the push rod to continue moving towards the closed position. The peripheral sidewall of the first gear is provided with a plurality of continuously arranged transmission teeth and a first tooth-deficient section without transmission teeth. When the first gear begins to mesh with the first rack belt, the first transmission tooth of the first rack belt is opposite to the first tooth-deficient section.

[0014] In some embodiments, the first tooth-deficient segment includes a first transmission tooth setting position, which can be configured to provide one transmission tooth; and / or the second tooth-deficient segment includes a second transmission tooth setting position, which can be configured to provide one transmission tooth.

[0015] In some embodiments, the first tooth-missing segment includes at least two consecutively arranged first transmission tooth positions; and / or the second tooth-missing segment includes at least two consecutively arranged second transmission tooth positions.

[0016] In some embodiments, the first transmission tooth setting position is provided with a broken transmission tooth; and / or the second transmission tooth setting position is provided with a broken transmission tooth.

[0017] In some embodiments, along the direction of movement of the push rod when the first gear and the first rack begin to mesh, the maximum outer diameter of the broken transmission tooth at one of the first transmission tooth positions is smaller than the maximum outer diameter of the broken transmission tooth at the next first transmission tooth position; along the direction of movement of the push rod when the second gear and the second rack begin to mesh, the maximum outer diameter of the broken transmission tooth at one of the second transmission tooth positions is smaller than the maximum outer diameter of the broken transmission tooth at the next second transmission tooth position.

[0018] In some embodiments, the drive assembly includes a mounting bracket, a drive member, and an elastic pad, the drive member being mounted on the mounting bracket and configured to drive the reduction gear set; the mounting bracket is mounted on the housing, and the elastic pad is disposed between the mounting bracket and the housing.

[0019] In some embodiments, the mounting bracket has a snap-fit ​​groove, the elastic pad is snapped into the snap-fit ​​groove, the elastic pad has an insertion hole, and the housing is provided with an insertion post that engages with the insertion hole.

[0020] In some embodiments, the door opening device further includes a limiting component, which includes a first limiting member and a second limiting member. Both the first limiting member and the second limiting member are fixedly connected to the top rod. The door opening device also includes a displacement sensor installed in the housing. When the top rod is in the closed position, the first limiting member triggers the displacement sensor. When the top rod moves to the open position, the second limiting member triggers the displacement sensor.

[0021] In some embodiments, the door opening device further includes a tension spring, one end of which is connected to the housing and the other end of which is connected to the top rod.

[0022] In a second aspect, a household appliance is provided, characterized in that it includes a housing, an appliance door, and the aforementioned door opening device, wherein the appliance door is pivotally connected to the housing, and the door opening device is installed in one of the housing and the appliance door, and when the appliance door is closed and the push rod of the door opening device is in the closed position, one end of the push rod abuts against the other of the housing and the appliance door.

[0023] The beneficial effects of this invention are:

[0024] The door opening device provided by this invention is installed on the door or housing of a household appliance. When the door needs to be opened, a push rod is slidably connected to the housing. A first gear meshes with a first rack belt, and a transmission assembly drives a reduction gear set. The output end of the reduction gear set meshes with the first gear and the second gear, causing the first gear to rotate in the forward direction and moving the push rod from the closed position to the open position. The reduction ratio of the reduction gear set relative to the first gear is greater than the reduction ratio of the reduction gear set relative to the second gear, thus giving the push rod a larger thrust to overcome the magnetic attraction between the magnetic door seal and the housing. When the first gear disengages from the first rack belt, the second gear engages with the second rack belt to drive the push rod to continue moving towards the opening position. Because the reduction ratio of the reduction gear set relative to the second gear is smaller than the reduction ratio of the reduction gear set relative to the first gear, the push rod has a faster movement speed, causing the electrical door to rotate quickly and open. At the same time, by setting multiple continuously arranged transmission teeth and a second toothed section without transmission teeth on the peripheral side wall of the second gear, it is possible to prevent the second gear and the second rack belt from jamming when they mesh, thus ensuring the reliable operation of the door opening device.

[0025] The household appliance provided by this invention has an appliance door pivotally connected to a housing. An opening device is installed in one of the housing and the appliance door. When the appliance door is closed and the push rod of the opening device is in the closed position, one end of the push rod abuts against the other of the housing and the appliance door, thereby automatically opening the appliance door and improving the reliability of the opening device to improve the reliability of the appliance's operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the door opening device according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the door opening device according to an embodiment of the present invention when the top rod is in the closed position;

[0028] Figure 3 This is a schematic diagram of the door opening device according to an embodiment of the present invention when the second gear and the second rack belt begin to mesh;

[0029] Figure 4 yes Figure 3A magnified view of a portion of point A in the middle;

[0030] Figure 5 This is a schematic diagram of the opening device according to an embodiment of the present invention when the first gear and the first rack belt begin to mesh;

[0031] Figure 6 yes Figure 5 A magnified view of a portion of point B in the middle.

[0032] In the picture:

[0033] 1. Housing; 11. Connecting post;

[0034] 2. Push rod; 21. First rack belt; 22. Second rack belt;

[0035] 3. Transmission assembly; 31. First gear; 311. First tooth-missing section; 32. Second gear; 321. Second tooth-missing section; 33. Reduction gear set; 331. First double gear; 3311. Third gear; 3312. Fourth gear;

[0036] 4. Drive assembly; 41. Mounting bracket; 411. Snap-fit ​​slot; 42. Drive component; 43. Elastic pad; 431. Insertion hole;

[0037] 5. Limiting component; 51. First limiting element; 52. Second limiting element;

[0038] 6. Displacement sensor. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] Figure 1 A schematic diagram of the door opening device according to an embodiment of the present invention is shown. Figure 2 The diagram shows a schematic of the door opening device according to an embodiment of the present invention when the top rod 2 is in the closed position. Figure 3 The diagram shows a schematic of the opening device of the present invention when the second gear 32 and the second rack belt 22 begin to mesh. Figure 4 It shows Figure 3 A magnified view of a portion of point A in the diagram. (See diagram below.) Figures 1 to 4As shown, the present invention provides a door opening device, including a housing 1, a push rod 2, a transmission assembly 3, and a drive assembly 4. The push rod 2 is slidably connected to the housing 1 and can move between an open position extending out of the housing 1 and a closed position retracted inside the housing 1. The push rod 2 has a first rack belt 21 and a second rack belt 22 sequentially arranged along its sliding direction, both extending along the sliding direction of the push rod 2. The transmission assembly 3 includes a first gear 31, a second gear 32, and a reduction gear set 33. The reduction gear set 33 is mounted on the housing 1, and its output end meshes with the first gear 31 and the second gear 32 respectively. The reduction ratio of the reduction gear set 33 relative to the first gear 31 is greater than the reduction ratio of the reduction gear set 33 relative to the second gear 32. The gear shafts of the first gear 31 and the second gear 32 are rotatably connected to the housing 1 respectively. The drive assembly 4 is mounted on the housing 1 and configured to drive the reduction gear set 33. When the push rod 2 is in the closed position, the first gear 31 meshes with the first rack belt 21. The reduction gear set 33 drives both the first gear 31 and the second gear 32 to rotate in the forward direction. The forward rotation of the first gear 31 causes the push rod 2 to move from the closed position to the open position. When the first gear 31 disengages from the first rack belt 21, the second gear 32 begins to mesh with the second rack belt 22 to drive the push rod 2 to continue moving towards the open position. The peripheral sidewall of the second gear 32 is provided with multiple continuously arranged transmission teeth and a second toothed section 321 without transmission teeth. When the second gear 32 begins to mesh with the second rack belt 22, the first transmission tooth of the second rack belt 22 is directly opposite the second toothed section 321. It should be noted that the door opening device provided in this embodiment is installed on the appliance door or cabinet of the household appliance. The drive component 4 is communicatively connected to the controller of the household appliance, so that the controller of the household appliance can control the drive component 4 to drive the reduction gear set 33 of the transmission component 3 to run. The output end of the reduction gear set 33 can make the first gear 31 and the second gear 32 rotate because they mesh with the first gear 31 and the second gear 32 respectively.

[0044] The door opening device provided in this embodiment is installed on the door or housing of a household appliance. When the door needs to be opened, the push rod 2 is slidably connected to the housing 1. The first gear 31 meshes with the first rack belt 21. The transmission assembly 3 drives the reduction gear set 33 to run. The output end of the reduction gear set 33 meshes with the first gear 31 and the second gear 32 respectively, causing the first gear 31 to rotate in the forward direction and moving the push rod 2 from the closed position to the open position. The reduction ratio of the reduction gear set 33 relative to the first gear 31 is greater than the reduction ratio of the reduction gear set 33 relative to the second gear 32, thereby giving the push rod 2 a larger thrust to overcome the magnetic attraction between the magnetic door seal and the housing. When gear 31 disengages from the first rack and belt 21, the second gear 32 begins to mesh with the second rack and belt 22 to drive the push rod 2 to continue moving towards the opening position. Because the reduction ratio of the reduction gear set 33 to the second gear 32 is smaller than the reduction ratio of the reduction gear set 33 to the first gear 31, the push rod 2 has a faster moving speed, causing the electrical door to rotate quickly and open the electrical door. At the same time, by setting multiple continuously arranged transmission teeth and a second toothed section 321 without transmission teeth on the peripheral side wall of the second gear 32, it is possible to prevent the second gear 32 from jamming with the second rack and belt 22 when the second gear 32 and the second rack and belt 22 are meshed, thus ensuring the reliable operation of the door opening device.

[0045] Figure 5 A schematic diagram of the opening device according to an embodiment of the present invention is shown when the first gear 31 and the first rack belt 21 begin to mesh. Figure 6 It shows Figure 5 A magnified view of a portion at point B. (See diagram below.) Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, when the push rod 2 is in the open position, the second gear 32 meshes with the second rack belt 22. The reduction gear set 33 drives the first gear 31 and the second gear 32 to rotate in opposite directions. The reverse rotation of the second gear 32 causes the push rod 2 to move from the open position to the closed position. When the second gear 32 disengages from the second rack belt 22, the first gear 31 begins to mesh with the first rack belt 21 to drive the push rod 2 to continue moving towards the closed position. The peripheral sidewall of the first gear 31 is provided with multiple continuously arranged transmission teeth and a first tooth-deficient section 311 without transmission teeth. When the first gear 31 begins to mesh with the first rack belt 21, the first transmission tooth of the first rack belt 21 is directly opposite the first tooth-deficient section 311. This prevents the first gear 31 from getting stuck with the first rack belt 21 when they begin to mesh, ensuring the reliable operation of the door opening device.

[0046] It is understandable that the shafts of the first gear 31 and the second gear 32 are rotatably connected to the housing 1. When assembling the door opening device and assembling the first gear 31 and the second gear 32, the assembler needs to assemble and adjust them so that when the first gear 31 starts to mesh with the first rack belt 21, the first drive tooth of the first rack belt 21 is aligned with the first tooth-missing section 311, and when the second gear 32 starts to mesh with the second rack belt 22, the first drive tooth of the second rack belt 22 is aligned with the second tooth-missing section 321.

[0047] like Figure 3 and Figure 5 As shown, the first tooth-missing segment 311 includes a first transmission tooth setting position, which can accommodate one transmission tooth. That is, the first tooth-missing segment 311 can be obtained by cutting off one transmission tooth from a complete gear, thus eliminating the need to design and machine a separate first gear 31 for the first tooth-missing segment 311; only the machined gear needs to have one transmission tooth cut off. Similarly, the second tooth-missing segment 321 includes a second transmission tooth setting position, which can accommodate one transmission tooth.

[0048] Preferably, the first tooth-missing segment 311 includes at least two consecutively arranged first transmission tooth mounting positions, thereby increasing the width of the first tooth-missing segment 311. This ensures that when the first gear 31 and the first rack belt 21 begin to mesh, the first transmission tooth of the first rack belt 21 is aligned with the first tooth-missing segment 311, reducing the requirements for the assembly accuracy of the first gear 31. Similarly, the second tooth-missing segment 321 includes at least two consecutively arranged second transmission tooth mounting positions, ensuring that when the second gear 32 and the second rack belt 22 begin to mesh, the first transmission tooth of the second rack belt 22 is aligned with the second tooth-missing segment 321, reducing the requirements for the assembly accuracy of the second gear 32. It should be noted that the number of transmission tooth mounting positions in the first tooth-missing segment 311 and the second tooth-missing segment 321 can be one, two, three, or even more. Those skilled in the art can reasonably set the number of transmission tooth mounting positions according to the module and pitch circle diameter of the gear and rack. That is, those skilled in the art can cut off multiple transmission teeth according to actual needs, which will not be elaborated here.

[0049] In this embodiment, the first transmission tooth setting position is provided with a broken transmission tooth, that is, only a portion of the tooth profile of the transmission tooth is removed, so that the broken transmission tooth will not interfere with the first transmission tooth of the rack, but can still engage with the first transmission tooth of the first rack belt 21 to a certain extent, ensuring the smoothness of transmission. Similarly, the second transmission tooth setting position is provided with a broken transmission tooth. It should be noted that those skilled in the art can set the degree of tooth profile removal of the transmission tooth according to actual needs, as long as it will not interfere with the first transmission tooth of the rack, but can still engage with the first transmission tooth of the first rack belt 21 to a certain extent.

[0050] Preferably, along the moving direction of the push rod 2 when the first gear 31 and the first rack belt 21 begin to mesh, the maximum outer diameter of the broken transmission tooth at one first transmission tooth setting position is smaller than the maximum outer diameter of the broken transmission tooth at the next first transmission tooth setting position. That is, along the moving direction of the push rod 2, the cutting degree of the transmission teeth decreases sequentially, so that the first transmission tooth of the rack first meshes with the broken transmission tooth with a larger cutting degree, and then meshes with the broken transmission tooth with a smaller cutting degree. This improves the smoothness of the transmission between the first gear 31 and the first rack belt 21 and prevents the first gear 31 and the first rack belt 21 from jamming. Similarly, along the moving direction of the push rod 2 when the second gear 32 and the second rack belt 22 begin to mesh, the maximum outer diameter of the broken transmission tooth at one second transmission tooth setting position is smaller than the maximum outer diameter of the broken transmission tooth at the next second transmission tooth setting position.

[0051] like Figure 2 As shown, the drive assembly 4 includes a mounting bracket 41, a drive component 42, and an elastic pad 43. The drive component 42 is mounted on the mounting bracket 41 and configured to drive the reduction gear set 33. The mounting bracket 41 is mounted on the housing 1. The elastic pad 43 is disposed between the mounting bracket 41 and the housing 1, so that when the vibration generated by the drive component 42 is transmitted to the housing 1 through the mounting bracket 41, the vibration can be absorbed by the elastic pad 43, thereby preventing the vibration generated by the drive component 42 from adversely affecting the connection between the mounting bracket 41 and the housing 1. Specifically, the mounting bracket 41 has a snap-fit ​​groove 411, and the elastic pad 43 snaps into the snap-fit ​​groove 411. The elastic pad 43 has a plug-in hole 431. The housing 1 is provided with a plug-in post 11 that engages with the plug-in hole 431, thereby ensuring that the vibration generated by the drive component 42 can be transmitted to the elastic pad 43 and absorbed by the elastic pad 43. It should be noted that the elastic pad 43 can be a rubber pad, a foam pad, or a spring steel pad, as long as it can absorb the vibration generated by the drive component 42.

[0052] like Figure 5 As shown, the reduction gear set 33 also includes a first double gear 331. The shaft of the first double gear 331 is rotatably connected to the housing 1. The first double gear 331 includes a third gear 3311 and a fourth gear 3312 coaxially arranged. The pitch circle diameter of the third gear 3311 is smaller than that of the fourth gear 3312. The third gear 3311 meshes with the first gear 31, and the fourth gear 3312 meshes with the second gear 32. The driving member 42 can drive the first double gear 331 to rotate. It can be understood that the first double gear 331, as the output end of the reduction gear set 33, can drive the first gear 31 and the second gear 32 to rotate simultaneously.

[0053] In some embodiments, the reduction gear set 33 further includes a worm gear and a worm. The worm is coaxially connected to the output end of the drive member 42, and the shaft of the worm gear is rotatably connected to the housing 1 and can drive the first double gear 331 to rotate. This can change the transmission direction of the drive, thereby reducing the space occupied by the drive member 42 and the reduction gear set 33 in the housing 1 and reducing the volume of the door opening device.

[0054] It should be noted that there are still multiple reduction gears between the worm and the first double gear 331, which are used to reduce the speed output by the drive component 42 and increase the torque provided by the drive component 42. The specific number of gears can be reasonably set by those skilled in the art according to actual needs, and will not be elaborated here.

[0055] Continue as Figures 2 to 5 As shown, the door opening device also includes a limiting component 5, which includes a first limiting member 51 and a second limiting member 52. Both the first limiting member 51 and the second limiting member 52 are fixedly connected to the top rod 2. The door opening device also includes a displacement sensor 6 installed on the housing 1. When the top rod 2 is in the closed position, the first limiting member 51 triggers the displacement sensor 6. When the top rod 2 moves to the open position, the second limiting member 52 triggers the displacement sensor 6. This limits the maximum range of movement of the top rod 2 between the open and closed positions, thereby allowing the top rod 2 to extend to the optimal length to open the electrical door. Specifically, the first limiting member 51 and the second limiting member 52 are trigger plates, which are fixedly connected to the top rod 2. The displacement sensor 6 is a micro switch, photoelectric switch, or infrared switch. The displacement sensor 6 is communicatively connected to the controller of the household appliance. When the top rod 2 moves to the open position, the first limiting member 51 can trigger the micro switch, which can send a stop signal to the controller. The controller can then stop the drive member 42. When the top rod 2 moves to the closed position, the second limiting member 52 can trigger the micro switch, which can send a stop signal to the controller. The controller can then stop the drive member 42.

[0056] In some embodiments, the door opening device further includes a tension spring, one end of which is connected to the housing 1 and the other end is connected to the push rod 2. This ensures that the push rod 2 is always subjected to the tension of the tension spring during the movement between the open and closed positions, forcing the gear and rack to maintain the same meshing state during the return process as when the push rod 2 was pushed out, thus avoiding jamming or misalignment of the gears.

[0057] This embodiment also provides a household appliance, including a cabinet, an appliance door, and the aforementioned door opening device. The appliance door is pivotally connected to the cabinet, and the door opening device is installed in one of the cabinet and the appliance door. When the appliance door is closed and the push rod 2 of the door opening device is in the closed position, one end of the push rod 2 abuts against the other of the cabinet and the appliance door, thereby automatically opening the appliance door of the household appliance and improving the reliability of the door opening device to improve the reliability of the operation of the household appliance.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A door opening device, characterized in that, include: Shell (1); The top rod (2) is slidably connected to the housing (1) and can move between the open position extending out of the housing (1) and the closed position retracted inside the housing (1). The top rod (2) is provided with a first rack belt (21) and a second rack belt (22) in sequence along its sliding direction. The first rack belt (21) and the second rack belt (22) both extend along the sliding direction of the top rod (2). The transmission assembly (3) includes a first gear (31), a second gear (32), and a reduction gear set (33). The reduction gear set (33) is mounted on the housing (1) and its output end meshes with both the first gear (31) and the second gear (32). The reduction ratio of the reduction gear set (33) to the first gear (31) is greater than the reduction ratio of the reduction gear set (33) to the second gear (32). The gear shafts of the first gear (31) and the second gear (32) are rotatably connected to the housing (1). A drive assembly (4) is mounted on the housing (1) and configured to drive the reduction gear set (33) to operate; When the push rod (2) is in the closed position, the first gear (31) meshes with the first rack belt (21), and the reduction gear set (33) drives the first gear (31) and the second gear (32) to rotate in the forward direction. The first gear (31) rotates in the forward direction, causing the push rod (2) to move from the closed position to the open position. When the first gear (31) disengages from the first rack belt (21), the second gear (32) begins to mesh with the second rack belt (22) to drive the push rod (2) to continue moving towards the open position. The peripheral sidewall of the second gear (32) is provided with a plurality of continuously arranged transmission teeth and a second tooth-deficient section (321) without the transmission teeth. When the second gear (32) begins to mesh with the second rack belt (22), the first transmission tooth of the second rack belt (22) is opposite to the second tooth-deficient section (321).

2. The door opening device according to claim 1, characterized in that, When the push rod (2) is in the open position, the second gear (32) meshes with the second rack belt (22), and the reduction gear set (33) drives the first gear (31) and the second gear (32) to rotate in opposite directions. The second gear (32) rotates in opposite directions, causing the push rod (2) to move from the open position to the closed position. When the second gear (32) disengages from the second rack belt (22), the first gear (31) begins to mesh with the first rack belt (21) to drive the push rod (2) to continue moving towards the closed position. The peripheral sidewall of the first gear (31) is provided with a plurality of continuously arranged transmission teeth and a first tooth-deficient section (311) without the transmission teeth. When the first gear (31) begins to mesh with the first rack belt (21), the first transmission tooth of the first rack belt (21) is opposite to the first tooth-deficient section (311).

3. The door opening device according to claim 2, characterized in that, The first tooth-deficient segment (311) includes a first transmission tooth setting position, which can be configured to provide one of the transmission teeth; and / or the second tooth-deficient segment (321) includes a second transmission tooth setting position, which can be configured to provide one of the transmission teeth.

4. The door opening device according to claim 3, characterized in that, The first tooth-deficient segment (311) includes at least two consecutively arranged first transmission tooth positions; and / or the second tooth-deficient segment (321) includes at least two consecutively arranged second transmission tooth positions.

5. The door opening device according to claim 4, characterized in that, The first transmission tooth setting position is provided with a broken transmission tooth; and / or the second transmission tooth setting position is provided with a broken transmission tooth.

6. The door opening device according to claim 5, characterized in that, Along the direction of movement of the push rod (2) when the first gear (31) and the first rack belt (21) begin to mesh, the maximum outer diameter of the broken transmission tooth set at one of the first transmission tooth setting positions is smaller than the maximum outer diameter of the broken transmission tooth set at the next first transmission tooth setting position; along the direction of movement of the push rod (2) when the second gear (32) and the second rack belt (22) begin to mesh, the maximum outer diameter of the broken transmission tooth set at one of the second transmission tooth setting positions is smaller than the maximum outer diameter of the broken transmission tooth set at the next second transmission tooth setting position.

7. The door opening device according to any one of claims 1-6, characterized in that, The drive assembly (4) includes a mounting bracket (41), a drive element (42), and an elastic pad (43). The drive element (42) is mounted on the mounting bracket (41) and configured to drive the reduction gear set (33) to operate. The mounting bracket (41) is mounted on the housing (1), and the elastic pad (43) is disposed between the mounting bracket (41) and the housing (1).

8. The door opening device according to claim 7, characterized in that, The mounting bracket (41) has a snap-fit ​​groove (411), the elastic pad (43) is snapped into the snap-fit ​​groove (411), the elastic pad (43) has a plug hole (431), and the housing (1) is provided with a plug post (11) that is plugged into the plug hole (431).

9. The door opening device according to any one of claims 1-6, characterized in that, The door opening device also includes a limiting component (5), which includes a first limiting member (51) and a second limiting member (52). The first limiting member (51) and the second limiting member (52) are both fixedly connected to the top rod (2). The door opening device also includes a displacement sensor (6) installed on the housing (1). When the top rod (2) is in the closed position, the first limiting member (51) triggers the displacement sensor (6). When the top rod (2) moves to the open position, the second limiting member (52) triggers the displacement sensor (6).

10. The door opening device according to any one of claims 1-6, characterized in that, The door opening device also includes a tension spring, one end of which is connected to the housing (1) and the other end is connected to the top rod (2).

11. A household appliance, characterized in that, The device includes a housing, an electrical door, and an opening device as described in any one of claims 1-10, wherein the electrical door is pivotally connected to the housing, and the opening device is installed in one of the housing and the electrical door, wherein when the electrical door is closed and the push rod (2) of the opening device is in the closed position, one end of the push rod (2) abuts against the other of the housing and the electrical door.

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