CN106724867B

CN106724867B - Cover opening structure and electric rice cooker or electric pressure cooker

Info

Publication number: CN106724867B
Application number: CN201710120869.3A
Authority: CN
Inventors: 陈亮; 李锦彬; 洪奕龙; 尚飞; 刘靖; 覃德华
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-03-02
Filing date: 2017-03-02
Publication date: 2023-06-06
Anticipated expiration: 2037-03-02
Also published as: CN106724867A

Abstract

The invention provides a cover opening structure and an electric rice cooker or an electric pressure cooker. The door opening structure comprises a button assembly with a first joint surface; the cover is provided with a second combining surface, the first combining surface can be contacted with the second combining surface, the rotating axle center of the button component is defined as O, the endpoints of two limiting ends which can be contacted with the second combining surface on the first combining surface are respectively D1 and D2, D1 is positioned at the free end of the first combining surface, O points are used for leading the perpendicular line and the vertical point of the first combining surface to be self-locking points S, an angle D1OD2 clamped between D1, O and D2 is a buckling angle alpha, an angle D1OS clamped between D1, O and S is a self-locking angle gamma, and a first preset angle < alpha-gamma < second preset angle and alpha > gamma are arranged, wherein the first preset angle and the second preset angle are both larger than 0 degrees. According to the cover opening structure and the electric rice cooker, a reasonable buckling angle can be obtained, so that the button assembly and the cover cannot be tripped after being buckled, meanwhile, the cover cannot be opened, and the buckling structure is high in reliability.

Description

Cover opening structure and electric rice cooker or electric pressure cooker

Technical Field

The present invention relates to the field of electric appliances, and more particularly, to a cover opening structure of an electric appliance such as an electric rice cooker.

Background

In the daily use process of the electric rice cooker, the unreasonable design of the cover-opening structure can cause inconvenient use. For example, in the working process of the whole machine, the surface cover expands due to heating, and meanwhile, the processing errors of all matched parts are considered, so that the matched position of the front end buckling position is easy to be propped up and dead in the cover opening process. Resulting in poor uncapping, such as improper tripping, and inability to uncap in severe cases. If the number of the buckling positions of the cover opening structure is too large, the cover opening stroke (angle) is large, and the effective cover opening operation is not facilitated. Furthermore, if the buckling amount of the cover opening structure is small, the cover opening stroke is too small, and the self-locking cannot be effectively realized. In the using process of the appliance, the situation that the appliance cannot be locked can occur, and the trip can occur seriously. Affecting normal use.

In order to solve the technical problems, an uncovering structure is urgently needed, the buckling amount after the structure is closed is reasonable, the adverse conditions that the closing process or the tripping after the closing can not occur and the cover cannot be opened in the uncovering process are avoided, and the structure is reliable in buckling and good in operation hand feeling.

Disclosure of Invention

In order to solve the above-described problems, according to an aspect of the present invention, there is provided an open cover structure including: a button assembly having a first bonding surface; a support structure to which the button assembly is pivotally mounted; the cover can be combined with the button assembly, wherein the cover is provided with a second combining surface, a first combining surface can be contacted with the second combining surface, the rotation axis of the button assembly is defined as O, the endpoints of two extreme ends of the first combining surface, which can be contacted with the second combining surface, are respectively D1 and D2, wherein D1 is positioned at the free end of the first combining surface, O points are used for leading the perpendicular line and the vertical point of the first combining surface to be a self-locking point S, an angle D1OD2 clamped among the D1, O and D2 is a buckling angle alpha, an angle D2OS clamped among the D2, O and S is a self-locking angle gamma, and a first preset angle < alpha-gamma < second preset angle is arranged, wherein the first preset angle and the second preset angle are both larger than 0 degrees.

Further, the buckling amount of the first bonding surface and the second bonding surface is the length of a side D1D2 corresponding to the buckling angle alpha in the triangle D1OD2, the projection length of the D1D2 on the horizontal plane is the transverse buckling amount, and the value range of the transverse buckling amount is 2.5mm-3mm.

Further, the first angle formed by the second joint surface and the horizontal plane is a friction angle beta, and the friction angle beta and the self-locking angle gamma are in positive correlation: i.e. larger beta gamma is bigger and smaller beta gamma is smaller.

Further, the value range of the friction angle beta is between 10 degrees and 15 degrees, the first combining surface is in contact with the second combining surface in a fitting way, and the second angle formed by the first combining surface and the horizontal plane is equal to the first angle.

Further, the button assembly further includes a space-avoiding structure having a hollow space, and the cover further includes a catching structure protruding from the cover, the catching structure being insertable into the space-avoiding structure.

Further, the cover further includes guide ribs for guiding the cover in combination with the button assembly.

Further, a first groove for receiving the guide rib is provided in the support structure.

Further, the cover includes two spaced apart latch structures.

Further, the button assembly includes two spaced apart clearance formations for receiving the latch formations respectively.

Further, the button assembly comprises an uncovering button and a button support used for supporting the uncovering button, wherein the first combining surface is arranged on the button support.

Further, a support structure is included, the button assembly being pivotally mounted to the support structure by the button bracket.

Further, the button bracket is provided with protruding portions extending from both end portions thereof, the protruding portions being provided in the second groove of the support structure.

Further, a first limiting structure for limiting the button assembly to rotate towards the combination direction of the button assembly and the cover is arranged on the button assembly;

and/or the support structure further comprises a second limiting structure for limiting the rotation of the button assembly towards the direction in which the button assembly is separated from the cover.

Further, the cover further comprises an arc surface adjacent to the second combining surface and protruding towards the cover opening button, and the arc surface is contacted with the button assembly when the button assembly is combined with the cover.

According to another aspect of the present invention, there is provided an electric rice cooker or an electric pressure cooker, including the above-mentioned cover opening structure.

The cover opening structure and the electric rice cooker or the electric pressure cooker with the cover opening structure have the following advantages:

1. reasonable buckling angle, can not appear tripping after button subassembly and the lid lock, and can be smooth uncapping when uncapping, buckling structure reliability is high.

2. The sealing cover has reasonable buckling amount, so that the defect that the sealing cover is blocked after being tripped in the limit use process is avoided, and the design advantage is particularly outstanding for the gas-assisted die.

3. The cover opening button assembly adopts a clearance design, so that the cover opening and closing requirement can be met in a limit state.

4. The transverse buckling amount is 2.5mm-3mm, so that the requirement of limiting cover opening can be met, and the reliability of the buckling structure is higher.

5. The large arc transition designed at the lower part of the cover buckling position ensures that the cover closing sound is crisp, the cover opening process is smooth, and the operation hand feeling is better.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 schematically illustrates a perspective view of an open cover structure according to an embodiment of the present invention;

FIG. 2 schematically illustrates a cross-sectional view of the door structure shown in FIG. 1 after engagement;

FIG. 3 schematically illustrates an enlarged view of the button assembly of FIG. 1 mated with the cover;

FIG. 4 schematically illustrates a cross-sectional view of the button assembly in the open lid configuration illustrated in FIG. 1, disengaged (i.e., tripped) from the lid;

FIG. 5 schematically illustrates an enlarged cross-sectional view of the portion of the button assembly shown in FIG. 4 shown in a circle when the cover is released;

fig. 6 schematically illustrates a cross-sectional view of the door opening structure of fig. 1 opened to a maximum angle;

FIG. 7 schematically illustrates an enlarged view of the door shown in FIG. 6 at a maximum angle;

FIG. 8 schematically illustrates a cross-sectional view of the structure after the button assembly and the cover are combined, looking toward the cover;

FIG. 9 schematically illustrates a cross-sectional view of the structure after the button assembly and the cover are combined, looking toward the button assembly;

FIG. 10 is a graph schematically showing an analysis of the amount of engagement (i.e., the amount of snap) of the button assembly with the cover at a friction angle of 10 degrees;

fig. 11 schematically shows an analysis chart of the amount of bonding of the button assembly to the cover at a friction angle of 15 degrees.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

The invention provides a cover opening structure and an electric rice cooker or an electric pressure cooker with the cover opening structure, wherein the cover opening structure comprises: a button assembly rotatable and having a first engagement surface; a support structure to which the button assembly is pivotally mounted; a cover (preferably, a face cover) capable of being combined with the button assembly, wherein the cover is provided with a second combining face, the first combining face can be contacted with the second combining face, the rotation axis of the button assembly is defined as O, the endpoints of two extreme ends capable of being contacted with the second combining face on the first combining face are respectively D1 and D2, D1 is positioned at the free end of the first combining face, an O point is used for leading a perpendicular line and a vertical point of the first combining face to be a self-locking point S, an angle D1OD2 clamped among the D1, O and D2 is a buckling angle alpha, an angle D2OS clamped among the D2, O and S is a self-locking angle gamma, and a first preset angle < alpha-gamma < second preset angle and alpha > gamma are respectively larger than 0 deg.

When the buckling angle alpha is larger than the self-locking angle gamma, self-locking can be formed between the button assembly and the cover, and further when the buckling angle alpha is larger than the first preset angle, the situation that tripping occurs in the buckling process or after the buckling is completed can be effectively prevented, so that the button assembly and the cover are firmly buckled; when the buckling angle alpha-self-locking angle gamma is smaller than the second preset angle, the situation that the button assembly rotates by an excessive angle and the cover cannot be opened due to the excessive buckling angle (or the excessive buckling amount) can be effectively prevented, so that normal cover opening is effectively realized, and the size relation is ensured because alpha > gamma (self locking is realized), and the first preset angle and the second preset angle are both larger than 0. The invention adopts a reasonable buckling angle, so that the button component and the cover can not be tripped after being buckled, and the cover can be smoothly opened when the cover is opened, and the reliability of the buckling structure is greatly improved; the sealing cover has reasonable buckling amount, so that the defect that the sealing cover is blocked after being tripped in the limit use process is avoided, and the design advantage is particularly outstanding for the gas-assisted die.

As shown in fig. 1 and 2, the door opening structure includes a button assembly 10, a cover decoration plate 20, a support structure 30, and a cover 40, wherein the button assembly 10 can be pivotally mounted to the support structure 30, and the cover 40 can be combined with the button assembly 10, according to an embodiment of the present invention. The cover decorative plate 20 covers the cover 40.

As shown in fig. 2, the button assembly 10 includes an uncap button 11 and a button bracket 12 for supporting the uncap button 11. The button bracket 12 is provided with a first coupling surface 121 (shown in fig. 5), and the first coupling surface 121 is used to couple with the second coupling surface 41 (shown in fig. 5) of the cover 40. As shown in fig. 2, the button assembly 10 and the cover 40 are coupled to each other, i.e., the button assembly 10 and the cover 40 are snapped together, by the contact of the first coupling surface 121 and the second coupling surface 41.

As shown in fig. 3, the button assembly 10 further includes a first limiting structure 111, and according to an embodiment of the present invention, the first limiting structure 111 is disposed on the door button 11. As shown in a portion a of fig. 3, the first stopper 111 contacts the cover decoration plate 20 to restrict the button assembly 10 from further rotating toward the cover 40, i.e., toward the coupling direction of the button assembly 10 and the cover 40.

And, as shown in fig. 3, the support structure 30 further includes ribs 31 (shown in part b of fig. 3) extending therefrom in a vertical direction. Since the rib 131 plays a limiting role in an initial state, after the button assembly 10 and the cover 40 are engaged with each other as shown in fig. 3, the coupling amount (i.e., the amount of engagement) of the first coupling surface 121 and the second coupling surface 41 reaches a maximum value due to the first limiting structure 111 and the rib 31.

As shown in fig. 9, the button assembly 10 further includes a void structure having a hollow space. According to an embodiment of the invention, the clearance structure is provided as two mutually spaced hollow spaces 13, 14 for receiving a snap-fit structure of a cover 40, which will be described below. The support structure 30 further includes a first recess 32, the first recess 32 being adapted to receive a guide rib 47 (shown in fig. 8) of the cover 40, which will be described below. According to an embodiment of the present invention, the first recess 32 has a Y-shape.

Also, according to an embodiment of the present invention, the button bracket 12 is provided with protrusions 122 (as shown in fig. 9) extending from both ends thereof, and the protrusions 122 are disposed in the second grooves 33 of the support structure 40. With this arrangement, the button assembly 10 is able to rotate about the protrusion 122, i.e., the door button, about the axis of rotation. The rotation axis is O, as indicated by reference numeral 50 in fig. 3.

In addition, as shown in fig. 7, the support structure 30 further includes a second limiting structure 35 (shown at d of fig. 7) for limiting the rotation of the button assembly 10 toward the separation of the button assembly 10 from the cover 40.

Further, referring to fig. 8, the cover 40 also includes a snap feature. According to an embodiment of the present invention, the cover 40 includes two snap features 45 and 46 spaced apart from each other, and the cover 40 further includes guide ribs 47 for guiding the combination of the cover 40 and the button assembly 10.

Returning again to fig. 3, as shown, the lid 40 further includes an arc surface 43 (the arc of the present invention is a spline arc surface, and the major arc here is a relative concept, and can also be directly described as an arc surface transition.) adjacent to the second joint surface 41 and protruding toward the lid opening button 10, in this example, the upper arc upper end recommended angles 100 to 110 (same horizontal plane), and the lower end recommended angles 70 to 90 (same vertical direction)). During the process of combining the button assembly 10 and the cover 40, the arc surface 43 of the cover 40 is firstly contacted with the cover opening button 10 due to the clearance design of the guide rib 47 and the cover opening button assembly 10.

Preferably, the fastening amount of the first fastening surface 121 and the second fastening surface 41 is the length of the side D1D2 corresponding to the fastening angle α in the triangle D1OD2, the projection length of the side D1D2 on the horizontal plane is the transverse fastening amount, and the range of the transverse fastening amount is 2.5mm-3mm. The value range of the transverse buckling quantity is selected to be 2.5mm-3mm, and the value range corresponds to the value range of the buckling angle, so that the limit cover opening requirement can be ensured effectively, the release can be prevented, and the reliability of the buckling structure is stronger. According to the uncapping structure of the present invention, when the uncapping button assembly 10 is pushed to rotate around the uncapping rotation axis under the uncapping force, and the mating line of the uncapping button 11 and the bracket 12, i.e., the appearance parting line is exceeded, since the uncapping button assembly 10 is designed as the hollow structure of the empty avoidance structures 13, 14, the buckling

structures

45, 46 of the cover 40 can be smoothly buckled into the empty avoidance structures 13, 14 through the first limiting structure 111 and the ribs 31 shown in fig. 3, and the maximum buckling amount is 2.5mm to 3mm.

Preferably, the first angle formed by the second joint surface 121 and the horizontal plane is a friction angle β (which is an angle after engagement, which is a fixed value for the same scheme and is a fixed value after engagement; which is a fixed surface after engagement; which is different for different schemes), and the friction angle β and the self-locking angle γ have a positive correlation: i.e. larger beta gamma is bigger and smaller beta gamma is smaller. As can be seen from fig. 10 and 11, the points C2 and C1 where β is located form a triangle in the graph sandwiched by β, and β and γ are respectively in negative correlation with the angle where C1 is located, so that the friction angle β and the self-locking angle γ can be effectively deduced to be in positive correlation, and further if the cover opening structure can not be tripped and normal cover opening is not affected in order to control the buckling angle α, the friction angle β needs to be within a specific range, so that the cover opening structure can be effectively ensured to be opened without tripping and normal cover opening.

Also, according to an embodiment of the present invention, the angle β (as shown in fig. 10 and 11) formed by the second bonding surface 41 and the horizontal plane ranges from 10 ° to 15 °. Under this kind of knot position design angle, can guarantee limit uncapping requirement, buckling structure reliability is stronger.

At a friction angle β of 15 ° (as shown in fig. 11), wherein the cap release point C1 (i.e., the free end point thereof), the end points of the two extreme ends of the second engagement surface that can contact the first engagement surface are C1 and C2, respectively, and C2 is the end point closer to the inside of the cap; the release point D1 (namely the free end point) of the cover opening button assembly, the end points of the two extreme ends which can be contacted with the second joint surface on the first joint surface are D1 and D2 respectively, and D2 is an end point which is closer to the interior of the button assembly; and an O point is used for guiding a vertical line and a vertical point of the first joint surface to serve as a self-locking point S. The angle D1OD2 clamped between the D1, the O and the D2 is called a buckling angle alpha, and the angle D2OS clamped between the D2, the O and the S is called a self-locking angle gamma. Because the first combining surface and the second combining surface are combined and buckled, the two combining surfaces are overlapped and parallel when not combined, and the buckling angle alpha is also C1OC2. If the button assembly 10 and the cover 40 are effectively self-locked, the locking angle α > and the self-locking angle γ are required to be satisfied, and if the button assembly 10 and the cover 40 are not tripped, the α - γ > is required to be a first predetermined angle. As shown in the figure, the buckling angle alpha is 24 degrees, and the self-locking angle gamma is 19 degrees, so that the requirement can be met. The amount of lateral engagement L at the time of self-locking was 2mm (the amount of lateral engagement is the projected amount of the engagement amount (length) of the first and second engagement surfaces in the relative movement direction on the horizontal plane), and the maximum amount of lateral engagement L was 2.5mm. If the buckling position is overlong, the space for avoiding the empty of the cover opening button assembly is increased, and the cover opening angle is increased at the same time so as to smoothly open the cover.

When the friction angle β is 10 ° (as shown in fig. 10), the cover trip point C1 (i.e., the free end point thereof), the end points of the two extreme ends on the second joint surface that can contact with the first joint surface are C1 and C2, respectively, and C2 is an end point closer to the inside of the cover; the release point D1 (namely the free end point) of the cover opening button assembly, the end points of the two extreme ends which can be contacted with the second joint surface on the first joint surface are D1 and D2 respectively, and D2 is an end point which is closer to the interior of the button assembly; and an O point is used for guiding a vertical line and a vertical point of the first joint surface to serve as a self-locking point S. The angle D1OD2 clamped between the D1, the O and the D2 is called a buckling angle alpha, and the angle D2OS clamped between the D2, the O and the S is called a self-locking angle gamma. Because the first combining surface and the second combining surface are combined and buckled, the two combining surfaces are overlapped and parallel when not combined, and the buckling angle alpha is also C1OC2. If the button assembly 10 and the cover 40 can be effectively self-locked, the locking angle alpha > and the self-locking angle gamma are required to be satisfied, and if the button assembly 10 and the cover 40 are not tripped, the alpha-gamma is required to be enabled to be larger than a first preset angle; if the cover cannot be opened when the cover is opened (the cover cannot be effectively separated and are interfered with each other due to the too large buckling amount), the buckling angle or the buckling amount is required to be not too large, and the alpha-gamma is required to be smaller than the first preset angle, so that the cover can be opened normally. As shown in the figure, the buckling angle alpha is 23 degrees, and the self-locking angle gamma is 12 degrees, so that the requirement is met. During self-locking, the transverse buckling amount is 1.6mm, and the maximum transverse buckling amount is 3mm. The friction angle is small, the self-locking angle is small, and if the buckling amount is too small, the tripping is easy to occur.

Therefore, the friction angle, which is the angle formed between the second joint surface 41 and the horizontal plane, is in the range of 10 ° to 15 °, and the optimal range of the amount of engagement is 2.5 to 3mm. At this time, the angle of uncapping is reasonable, and the button assembly 10 and the cover 40 can not be tripped after buckling and can be uncapped normally, and the buckling structure is high in reliability.

In addition, the button assembly 10 and the cover 40 are buckled to meet the self-locking condition, namely, the buckling angle alpha is larger than the self-locking angle gamma, so that adverse phenomena such as incapability of self locking and the like do not occur.

According to an embodiment of the present invention, the front end of the cover 40 has a fastening position angle (i.e., a friction angle β) similar to the mating surface angle of the cover button 11 (i.e., the angle formed by the first joint surface 121 and the horizontal plane) (since it is preferable that the two surfaces are parallel when they are in contact with each other), the angle ranges from 10 ° to 15 °, and the fastening amount is preferably 2.5 to 3mm. At the moment, the uncovering angle of the uncovering button in the uncovering process is reasonable, meanwhile, the tripping phenomenon can not occur after the uncovering is carried out, and the buckling structure is reliable. Therefore, in this angular range, neither the trip is caused by too small an angle nor the cover is not opened due to too large an angle.

In the process of opening the cover, the cover opening button assembly 10 is rotated by the cover opening rotating shaft to be separated from the cover at the point c shown in fig. 5, and the reasonable buckling amount can effectively ensure the opening stroke (angle).

According to an embodiment of the invention, the fastening amount is 2.5mm-3mm. When the transverse buckling amount is smaller than the buckling amount, the tripping phenomenon is easy to occur. When the device is used in a limit state, the device cannot be effectively self-locked due to small buckling amount. When the buckling amount is too large, the angle of the uncapping button is opened to the maximum in the uncapping process, the uncapping stroke is possibly too long, and even the condition that the uncapping cannot be normally performed occurs. The structural design can meet the requirements of buckling reliability and design space.

When the cover opening angle reaches the maximum, the cover opening button assembly returns to the initial position under the action of the cover opening button spring due to the limiting structure at the position d (shown in fig. 7).

According to another embodiment of the present invention, the front end of the cover button support 12 is designed to have a barb-type structure, so that the self-locking structure is more reliable.

According to the present invention, there is also provided an apparatus, such as an electric rice cooker, including the above-mentioned cover opening structure.

The cover opening structure and the device with the cover opening structure have the following advantages:

1. the angle of uncapping is reasonable for can not appear tripping after button subassembly and the lid lock, lock structure reliability is high.

4. The buckling position quantity is 2.5mm-3mm, so that the requirement of limiting cover opening can be guaranteed, and the reliability of the buckling structure is higher.

5. The large arc transition designed at the lower part of the cover buckling position ensures that the closing sound is crisp, the cover opening process is smooth, and the operation hand feeling is better (the large arc transition is that the arc is not too large because the appearance of the cover opening button needs an arc), so the arc transition (spline curve arc surface) is designed on the cover buckling position, the smoothness of the cover closing process is mainly ensured, the contact area is effectively reduced like the contact of two arc surface lines, and the service life is prolonged, wherein the recommended angle of the upper end of the upper arc is 100-110 (same with the horizontal plane), and the recommended angle of the lower end is 70-90 (same with the vertical direction).

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An open cover structure, characterized in that, the open cover structure includes:

a button assembly (10), the button assembly (10) being rotatable and having a first engagement surface (121);

-a cover (40), the cover (40) being capable of being coupled with the button assembly (10), wherein the cover (40) has a second coupling surface (41), the first coupling surface (121) being capable of being in contact with the second coupling surface (41);

defining the rotation axis of the button assembly as O, wherein the endpoints of two extreme ends on the first combining surface, which can be contacted with the second combining surface, are respectively D1 and D2, D1 is positioned at the free end of the first combining surface, O points are used for guiding the vertical line and the vertical point of the first combining surface as self-locking points S, an angle D1OD2 clamped among D1, O and D2 is a buckling angle alpha, an angle D2OS clamped among D2, O and S is a self-locking angle gamma, and a first preset angle < alpha-gamma < second preset angle is arranged, wherein the first preset angle and the second preset angle are both larger than 0 degrees.

2. The cover opening structure according to claim 1, wherein the fastening amount of the first fastening surface (121) and the second fastening surface (41) is the length of a side D1D2 corresponding to a fastening angle α in a triangle D1OD2, the projection length of the D1D2 on a horizontal plane is a transverse fastening amount, and the value range of the transverse fastening amount is 2.5mm-3mm.

3. The door structure according to any one of claims 1-2, wherein the first angle formed by the second joint surface (41) and the horizontal plane is a friction angle β, which is in positive correlation with the self-locking angle γ: i.e. larger beta gamma is bigger and smaller beta gamma is smaller.

4. An open cover structure according to claim 3, wherein said friction angle β has a value in the range of 10 ^o To 15 ^o The first bonding surface is in contact with the second bonding surface in a bonding way, and a second angle formed by the first bonding surface (121) and a horizontal plane is equal to the first angle.

5. The door opening structure according to any one of claims 1-2, wherein the button assembly (10) further comprises a void structure having a hollow space, the lid (40) further comprising a catch structure protruding from the lid, the catch structure being insertable into the void structure.

6. The door opening structure according to claim 5, wherein the cover (40) further comprises a guide rib (47) for guiding the cover (40) to be combined with the button assembly (10).

7. The door opening structure according to claim 6, characterized in that said cover (40) comprises two said snap-on structures (45, 46) spaced apart from each other.

8. The door opening structure according to claim 7, characterized in that said push button assembly (10) comprises two said empty-guard structures (13, 14) spaced apart from each other for receiving said snap-on structures (45, 46), respectively.

9. The door opening structure according to claim 6, wherein the button assembly (10) includes a door button (11) and a button bracket (12) for supporting the door button (11), wherein the first bonding surface (121) is provided on the button bracket (12).

10. The door opening structure according to claim 9, further comprising a support structure (30), said button assembly (10) being pivotally mounted to said support structure (30) by means of said button bracket (12).

11. The door opening structure according to claim 10, characterized in that the support structure (30) is provided therein with a first recess (32) for receiving the guide rib (47).

12. The door opening structure according to claim 10, wherein the button bracket (12) is provided with protruding portions (122) extending from both end portions thereof, the protruding portions (122) being provided in the second recess (33) of the support structure (30).

13. The door opening structure according to claim 10, wherein the button assembly (10) is provided with a first stopper structure (111) for restricting rotation of the button assembly (10) toward a direction in which the button assembly (10) is combined with the cover (40);

and/or the support structure (30) further comprises a second limit structure (35) for limiting the rotation of the push button assembly (10) towards the separation direction of the push button assembly (10) from the cover (40).

14. The door opening structure according to claim 9, wherein the door (40) further includes an arc surface (43) provided adjacent to the second engaging surface (41) and protruding toward the door opening button, the arc surface (43) being in contact with the button assembly (10) when the button assembly (10) is engaged with the door (40).

15. An electric rice cooker or an electric pressure cooker, which is characterized in that: comprising an open cover structure as claimed in any one of claims 1 to 14.