阅读说明：本技术 一种具有空炸功能的电饭煲 (Electric cooker with air-frying function ) 是由 陈锡雁 梁郁庆 于 2020-05-29 设计创作，主要内容包括：本发明提供一种具有空炸功能的电饭煲,其包括：上壳体、下壳体,所述上壳体与所述下壳体通过所述销轴活动连接,在所述上壳体内安装有空炸加热组件,所述空炸加热组件包括有用于通电发热的发热管、以及用于通电吹风的涡轮风叶,所述发热管围绕所述涡轮风叶的外周布置,涡轮风叶的外直径小于所述发热管的内直径,并且所述发热管与所述涡轮风叶固定安装在一致的水平高度上。根据本发明,能够实现食物受热更均匀,避免食物烤焦；并且能使得产品体积更小,结构紧凑便携,能够减少外壳的塑料用料,且降低产品成本以及生产工艺要求；而且便于清洗维护。(The invention provides an electric cooker with air-frying function, comprising: the air-fried heating assembly comprises a heating pipe used for being electrified to generate heat and a turbine blade used for being electrified to blow, the heating pipe surrounds the periphery of the turbine blade, the outer diameter of the turbine blade is smaller than the inner diameter of the heating pipe, and the heating pipe and the turbine blade are fixedly arranged at the same horizontal height. According to the invention, food can be heated more uniformly, and the food is prevented from being scorched; the product has smaller volume, compact and portable structure, can reduce the plastic material of the shell, and reduce the product cost and the production process requirement; and is convenient to clean and maintain.)

1. An electric rice cooker with air-frying function is characterized by comprising: the device comprises an upper shell (1) and a lower shell (2), wherein the upper shell (1) is movably connected with the lower shell (2) through a pin shaft (3); an air-frying heating assembly is arranged in the upper shell (1), and an electric cooker heating assembly is arranged in the lower shell (2); the air-frying heating assembly comprises a heating pipe (5) used for being electrified and heated and a turbine blade (10) used for being electrified and blown, wherein the heating pipe (5) is arranged around the periphery of the turbine blade (10), the outer diameter of the turbine blade (10) is smaller than the inner diameter of the heating pipe (5), and the heating pipe (5) and the turbine blade (10) are fixedly installed on the same horizontal height.

2. The electric cooker with air-frying function according to claim 1, wherein the heating tube (5) comprises at least two sections of heating tubes arranged side by side up and down, and the at least two sections of heating tubes are integrally and fixedly arranged on the same horizontal height with the turbine blade (10).

3. The electric cooker with air-frying function according to claim 1, characterized in that an electric cooker cover (17) and an air-fryer cover (18) which can be replaced and removed from each other are included in said upper casing (1), when said air-fryer cover (18) is fitted to the inside of said upper casing (1), said air-fryer cover (18) triggers said air-fryer switch (21) to close and turn on the air-frying heating assembly, and when said electric cooker cover (17) is fitted to the inside of said upper casing (1), said electric cooker cover (17) triggers said electric cooker switch (20) to close and turn on the electric cooker heating assembly.

4. The electric cooker with air-frying function according to claim 3, characterized in that when said electric cooker cover (17) is fitted to the inside of said upper casing (1), said electric cooker cover (17) simultaneously triggers said electric cooker switch (20) and said air-fryer switch (21) to close to turn on the electric cooker heating assembly.

5. The rice cooker with air-frying function according to claim 3, wherein when the air-frying pan cover (18) is fitted to the inside of the upper casing (1), the air-frying pan cover (18) simultaneously triggers the rice cooker switch (20) and the air-frying pan switch (21) to be closed to turn on the air-frying heating assembly.

6. The rice cooker with air-frying function according to claim 4 or 5, characterized in that a cover-opening detection switch (19) is further arranged on the inner side of the upper casing (1), when the upper casing (1) is covered relative to the lower casing (2), the cover-opening detection switch (19) is triggered to be closed, so as to allow the air-frying function or the rice cooker function to be started later; when the upper shell (1) is opened and separated from the lower shell (2), the uncovering detection switch (19) is switched off, so that the air-frying function is suspended or the normal operation of the electric cooker function is maintained.

7. The electric cooker with air-frying function as claimed in claim 6, wherein a heating tube cover (8) is fixedly mounted in said upper housing (1), a motor bracket (15) is fixedly arranged on said heating tube cover (8), and a motor (4) is fixed on said motor bracket.

8. The electric cooker with air-frying function as claimed in claim 7, wherein a heating tube fixing bracket (22) is fixedly arranged on the heating tube cover (8), the heating tube fixing bracket (22) is provided with a clamping groove, and the heating tube (5) is fixed in the clamping groove in the heating tube fixing bracket (22).

9. The electric cooker with air-frying function according to claim 8, characterized in that a motor cover (14) is further fixedly arranged in the upper casing (1), two isolated air exhaust channels are arranged on the motor cover (14), comprising: an upper cold air channel (23) and a lower hot air channel (24); and the upper shell (1) is provided with an air outlet (16) communicated with the outside, and the cold air channel (23) and the hot air channel (24) are communicated with the air outlet (16).

10. The electric cooker with air-frying function as claimed in claim 9, wherein the heating tube cover (8) has a shaft hole through which the output shaft of the motor (4) passes from top to bottom, and a convection fan blade (9) is fixedly mounted at a position of the output shaft of the motor (4) above the heating tube cover (8); the convection fan blade (9) is used for driving air in a cavity above the heating tube cover (8) to pass through the cold air channel (23) above the motor cover (14) and then to be discharged through the air outlet (16).

11. The electric cooker with air-frying function as claimed in claim 10, wherein a turbine fan blade (10) is fixedly mounted at a position of the output shaft of the motor (4) below the heating tube cover (8); the turbine fan blade (10) is used for driving gas in a cavity below the heating pipe cover (8) to blow towards a cavity containing food in the electric rice cooker, and the air in the cavity is discharged through a hot air channel (24) below the motor cover (14) in the upper shell (1) and then through an air outlet (16).

12. The rice cooker with air-frying function as claimed in claim 11, wherein an air outlet having a width smaller than that of the air outlet (16) is provided on the side wall of the heat-generating tube cover (8), and the air outlet is communicated with a hot air passage (24) of the motor cover (14).

13. The electric cooker with air-frying function as claimed in claim 3, wherein the air-frying pan cover (18) is provided with an internal circulation air inlet hole (6) and an internal circulation air outlet groove (11).

Technical Field

The invention relates to an electric heating cooking appliance, in particular to an electric cooker with an air-frying function.

Background

In modern life, food cooking appliances bring convenience to people, and especially multifunctional food cooking appliances are widely loved by people. At present, electric cooking appliances such as electric cookers, air ovens and the like with air-frying functions are very popular because the electric cooking appliances have common functions of cooking rice and baking and also have the air-frying function which is popular among people.

The air frying power of the cooking electric appliance can replace the traditional fryer, and the food which is crisp, delicious and smells strong fragrance can be made under the condition of no oil. The cooking appliance with the air-frying function brings food health under the condition of ensuring the taste of fried food, and is more environment-friendly due to the reduction of oil smoke.

In the prior electric cookers with air-frying function, such as electric cookers, air ovens and the like in the market, the heating mode adopted by the air-frying function is a heating plate with a grain odor type and is additionally provided with convection blades, wherein the convection blades and the heating plate are arranged in a vertically stacked mode. Therefore, the space occupied by the existing heating structure with the air-frying function is larger, so that more injection molding materials are needed to be adopted by the shell of the cooking appliance, the product cost is high, and the production process requirement is high. Meanwhile, the food is heated unevenly, and even the food closest to the heating tube is easily scorched.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides an electric cooker with air-frying function, which can solve the above problems in the prior art, so that the product has a smaller volume, a compact and portable structure, can reduce the material consumption of the injection molding material of the housing, reduce the product cost and the production process requirements, and can realize more uniform heating of food and avoid the food from being scorched.

The electric cooker with the air-frying function comprises: the upper shell and the lower shell are movably connected through a pin shaft; a blank frying heating assembly is arranged in the upper shell, and an electric cooker heating assembly is arranged in the lower shell; the air-frying heating assembly comprises a heating pipe used for being electrified and heated and a turbine blade used for being electrified and blown, wherein the heating pipe is arranged around the periphery of the turbine blade, the outer diameter of the turbine blade is smaller than the inner diameter of the heating pipe, and the heating pipe and the turbine blade are fixedly arranged at the same horizontal height.

Preferably, the heating pipe comprises at least two sections of heating pipes which are arranged side by side up and down, and the at least two sections of heating pipes are integrally and fixedly installed on the same horizontal height with the turbine fan blade.

Preferably, the upper shell comprises an electric cooker cover and an air fryer cover which can be replaced and disassembled mutually, when the air fryer cover is assembled on the inner side of the upper shell, the air fryer cover triggers the air fryer switch to be closed to switch on the air-frying heating assembly, and when the electric cooker cover is assembled on the inner side of the upper shell, the electric cooker cover triggers the electric cooker switch to be closed to switch on the electric cooker heating assembly.

Preferably, when the rice cooker cover is assembled to the inner side of the upper shell, the rice cooker cover simultaneously triggers the rice cooker switch and the air fryer switch to be closed so as to switch on the rice cooker heating assembly.

Preferably, when the air fryer cover is fitted inside the upper housing, the air fryer cover simultaneously triggers the rice cooker switch and the air fryer switch to close to turn on the air-fry heating assembly.

Preferably, an open cover detection switch is further arranged on the inner side of the upper shell, and when the upper shell is closed relative to the lower shell, the open cover detection switch is triggered to be closed, so that the subsequent starting of the air-frying function or the electric cooker function is allowed; when the upper shell is opened and separated from the lower shell, the uncovering detection switch is switched off, so that the air-frying function is suspended or the normal operation of the electric cooker function is kept.

Preferably, a heating tube cover is fixedly installed in the upper shell, a motor support is fixedly arranged on the heating tube cover, and a motor is fixed on the motor support.

Preferably, a heating tube fixing support is fixedly arranged on the heating tube cover, the heating tube fixing support is provided with a clamping groove, and the heating tube is fixed in the clamping groove in the heating tube fixing support.

Preferably, still fixedly in the upper casing be provided with the motor cover be equipped with two isolated air exhaust passageways on the motor cover, include: an upper cold air channel and a lower hot air channel; and the upper shell is provided with an air outlet communicated with the outside, and the cold air channel and the hot air channel are communicated with the air outlet.

Preferably, the heating pipe cover is provided with a shaft hole, an output shaft of the motor penetrates through the shaft hole from top to bottom, and a convection fan blade is fixedly installed at a position, above the heating pipe cover, of the output shaft of the motor; the convection fan blade is used for driving air in a cavity above the heating tube cover to pass through the cold air channel above the motor cover and then to be discharged through the air outlet.

Preferably, a turbine blade is fixedly installed at the position, below the heating pipe cover, of the output shaft of the motor; and air in the turbine fan blade is exhausted through the hot air channel below the motor cover in the upper shell and then through the air outlet.

Preferably, an air outlet which is smaller than the air outlet in width is arranged on the side wall of the heating pipe cover and is communicated with the hot air channel on the motor cover.

Preferably, the air fryer cover is provided with an internal circulation air inlet hole and an internal circulation air outlet groove.

The electric cooker with the air-frying function of the invention provides the following technical effects.

1. The electric cooker with the air-frying function uses the turbine blades instead of the convection blades in the prior art, and the turbine blades are arranged at the center of the heating tube, so that the heat of the heating tube can be uniformly blown to food under the action of the turbine blades, 360-degree dead angles are really avoided, the food is heated more uniformly, and even the food closest to the heating tube cannot be scorched.

2. By using the structure of the invention, the height of the assembly can be effectively reduced, and the height of the assembly can be reduced by 40mm compared with the height of the existing electric cooker with the air-frying function on the market, so that the product has smaller volume, compact and portable structure, the plastic material of the shell can be reduced, and the product cost and the production process requirement can be reduced.

3. In the invention, the heating pipe and the turbine blade are fixedly arranged on the same horizontal height, so that the cleaning and maintenance are more convenient for users.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.

FIG. 1 is a schematic view of the overall structure of an electric cooker with air-frying function according to the present application;

FIG. 2 is a schematic cross-sectional view of the upper housing of the rice cooker with air-frying function according to the present application;

fig. 3 is another schematic sectional view of the upper housing of the rice cooker with air-frying function according to the present application.

Fig. 4 is a plan view of a lid of an electric rice pot in the multifunctional electric heating cooking appliance to which the present application relates;

fig. 5 is a plan view of an air fryer lid in a multifunctional electrically heated cooking appliance according to the present application.

Description of reference numerals:

1-an upper shell; 2-a lower shell; 3-axle pin; 4-a motor; 5-a heating tube;

6-internal circulation air inlet holes; 7-a display panel; 8-heating tube cover; 9-convection fan blades;

10-turbine blades; 11-internal circulation air outlet groove; 12-a motor cover shell;

13-convection air inlet channel; 14-a motor cover; 15-a motor support; 16-air outlet;

17-electric cooker cover; 18-air fryer lid; 19-cover opening detection switch;

20-electric cooker switch; 21-air fryer switch; 22-a heating tube fixing bracket;

23-a cold air channel; 24-hot air channel; 181-inner groove

Detailed Description

Referring to fig. 1, the overall structure of the electric cooker with air-frying function according to the present application is shown. The electric cooker with the air-frying function comprises an upper shell, a lower shell and a pin shaft 3. An air-frying heating assembly is fixedly arranged on the inner side of the upper shell 1, and an electric cooker heating assembly is fixedly arranged on the inner side of the lower shell 2.

Referring to fig. 1 to 5, in the electric cooker with air-frying function of the present application, a motor 4, a heating tube 5, a heating tube cover 8, a convection fan blade 9, a turbine fan blade 10, a motor cover shell 12, a motor cover 14, a motor bracket 15, an air outlet 16, an electric cooker cover 17, an air-frying pan cover 18, a cover-opening detection switch 19, an electric cooker switch 20, an air-frying pan switch 21, a heating tube fixing bracket 22, and the like are arranged in an upper casing 1, wherein the air-frying heating assembly at least includes the heating tube cover 8 and the turbine fan blade 10; the lower shell 2 is internally provided with components such as a display panel 7, a frying basket, a pot liner, a frying basket bracket, an outer pot, a lower heating plate, a main control panel and the like; the upper shell 1 and the lower shell 2 are movably connected through a pin shaft 3.

First, the upper case of the rice cooker with air-frying function of the present application will be explained.

A heating tube cover 8 is fixedly arranged in the upper shell 1, and the heating tube cover 8 can cover the upper part and the periphery of the heating tube 5. The heating tube cover 8 is provided with a motor bracket 15 which is fixed by screws and on which the motor 4 is fixed.

The heating pipe cover 8 is provided with a shaft hole, an output shaft of the motor 4 can penetrate through the shaft hole from top to bottom, and a convection fan blade 9 is fixedly installed at the position, above the heating pipe cover 8, of the output shaft of the motor 4; and a turbine fan blade 10 is fixedly arranged at the position of the output shaft of the motor 4, which is positioned below the heating pipe cover 8.

The heating pipe 5 is arranged around the periphery of the turbine fan blade 10, the outer diameter of the turbine fan blade 10 is smaller than the inner diameter of the heating pipe 5, and the heating pipe 5 and the turbine fan blade 10 are fixedly installed on the same horizontal height.

Preferably, the heating tube 5 comprises two parallel heating tubes (two-section heating tube layout) arranged side by side up and down, and the at least two sections of heating tubes are integrally and fixedly installed on the same horizontal height with the turbine blade 10.

Because the turbine inner blade 10 and the heating tube 5 are positioned in the same horizontal plane after being fixedly installed, the height of the assembly can be effectively reduced, the height space can be reduced by 40mm compared with the existing structure on the market, and the cost is effectively saved. Moreover, the heat of the heating pipe can be uniformly blown to food under the action of the turbine fan blades, so that 360-degree dead angles are really realized, hot air is fully circulated in the frying basket and the pot liner, the food is heated more uniformly, and the food can not be scorched even if the food is closest to the heating pipe.

Of course, if the space allows or the function needs, more sections of heating tubes can be arranged; the arrangement of the multi-section heating tubes can be changed properly, and the multi-section heating tubes can be parallel up and down or in parallel, and can also be in a structure of forming concentric rings with different diameters. The applicant is not repeated here.

A heating tube fixing bracket 22 may be fixed to the heating tube cover 8 by a suitable method such as a screw. The heating tube fixing bracket 22 has one or more clamping grooves. The heating tube 5 is fixed in the clamping groove in the heating tube fixing bracket 22.

In addition, still fixedly in the upper casing 1 is provided with a motor cover 14, two isolated air exhaust channels are provided on the motor cover 14, including: an upper cold air passage 23 and a lower hot air passage 24; the upper housing 1 has an air outlet 16 communicating with the outside, and both the cold air passage 23 and the hot air passage 24 communicate with the air outlet 16.

The convection fan blade 9 is used for driving air in a cavity above the heating tube cover 8 to pass through the cold air channel 23 above the motor cover 14 and further to be discharged through the air outlet 16, so that a heat dissipation effect is achieved; the turbine fan blade 10 is used for driving the air in the cavity below the heating pipe cover 8 to blow to the cavity containing food in the electric rice cooker, so that the effect of accelerating convection of hot air is achieved, and the air in the cavity is discharged through the hot air channel 24 below the motor cover 14 in the upper shell 1 and further through the air outlet 16.

In addition, the rice pot cover 17 and the air-fryer cover 18 are detachably fitted to each other inside the upper casing 1.

An air fryer switch 21 and an electric cooker switch 20 are arranged on the inner side of the upper shell 1.

Wherein, as shown in fig. 5, the air fryer cover 18 has an inner groove 181 on the surface engaged with the upper casing 1, and the position of the inner groove 181 corresponds to the position of the rice cooker switch 20.

Thus, when the air fryer cover 18 is fitted inside the upper casing 1, the air fryer cover 18 triggers the air fryer switch 21 to close, but does not trigger the rice cooker switch 20, and the rice cooker switch 20 remains open, thereby completing the electric circuit of the air-fry heating assembly.

When the rice cooker cover 17 is assembled to the inner side of the upper case 1, the rice cooker cover 17 simultaneously triggers the rice cooker switch 20 and the air fryer switch 21 to be closed, so that only the electric circuit of the rice cooker heating assembly is switched on based on the triggering.

Alternatively, the electric cooker cover 17 may be provided with an inner groove similar to the air fryer cover 18 and positioned to correspond to the air fryer switch 21, so that when the electric cooker cover 17 is fitted to the inside of the upper casing 1, the electric cooker cover 17 triggers only the electric cooker switch 20 and keeps the air fryer switch 21 off, and on the basis thereof, only the electric circuit of the electric cooker heating assembly is turned on. When the air fryer cover 18 is assembled inside the upper casing 1, the air fryer cover 18 simultaneously triggers the rice cooker switch 20 and the air fryer switch 21 to be closed, so that only the circuit of the air-frying thermal assembly is switched on.

As a further alternative, an inner groove may be provided in each of the electric cooker cover 17 and the air fryer cover 18, and the inner groove may be positioned to correspond to the air fryer switch 21 and the electric cooker switch 20, respectively, so that when the air fryer cover 18 is fitted to the inside of the upper casing 1, the air fryer cover 18 triggers the air fryer switch 21 to close, but does not trigger the electric cooker switch 20, so as to switch on only the electric circuit of the air-fry heating assembly based on this; when the rice cooker cover 17 is fitted to the inside of the upper case 1, the rice cooker cover 17 activates only the rice cooker switch 20 but does not activate the air fryer switch 21, so that only the electric circuit of the rice cooker heating assembly is completed based thereon.

Therefore, when the electric cooker with the air-frying function is used, the corresponding functional circuit can be started through the assembling condition of the electric cooker cover 17 and the air-frying cooker cover 18, so that the condition of misoperation of a user is effectively avoided.

Further, a lid opening detection switch 19 is provided inside the upper case 1. The lid opening detection switch 19 corresponds to a state monitoring switch. That is, only when the upper casing 1 is closed relative to the lower casing 2, the open-cover detection switch 19 is triggered to be closed, and the subsequent start of the air-frying function is allowed; when the upper case 1 is opened to be separated from the lower case 2, the open-cover detection switch 19 is turned off. Under the condition that the air-frying heating assembly operates, if the cover opening detection switch 19 is switched off, the air-frying function is suspended; under the condition that the heating component of the electric cooker is operated, if the cover opening detection switch 19 is turned off, the function of the electric cooker can still be kept to continue normal operation.

An air outlet having a width smaller than that of the air outlet 16 is provided in the side wall of the heat pipe cover 8, and communicates with a hot air passage 24 of the motor cover 14. This facilitates heat dissipation in the heat pipe shroud to ensure normal operation of the turbine blade 10.

In addition, an internal circulation air inlet hole 6 and an internal circulation air outlet groove 11 are arranged on the air fryer cover 18, so that the internal hot air is blown to the food and the circulation of the hot air is realized.

And, a motor cover case 12 is positioned above the motor 4 to cover the motor 4. When the motor cover case 12 is mounted on the upper case 1, a convection air intake passage 13 is formed so that intake air is radiated.

Hereinafter, the lower case of the rice cooker with air-frying function according to the present invention will be described.

In the lower shell of the electric cooker with the air-frying function, the display panel 7 is electrically connected with the main control panel, and the main control panel is fixedly arranged at the bottom of the lower shell 2 and plays a role in electric control; the display board 7 is fixedly arranged on the side surface of the lower shell 2 and plays a role in displaying electric control parameters.

A lower heating plate is arranged above the bottom of the outer pot in the lower shell 2 to heat the pot liner; the pot liner is movably arranged above the lower heating plate and plays a role in containing and cooking food; the bottom of the frying basket is provided with a movable frying basket bracket which plays a role in supporting the frying basket; the frying basket with the frying basket bracket is movably arranged in the pot liner and plays a role in supporting the baked and fried food.

Next, the operation of the electric rice cooker with air-frying function of the present application in performing the air-frying function will be described.

After the electric cooker starts the air-frying function, the turbine fan blade 10 and the heating tube 5 work, the turbine fan blade 10 supplies hot air to the outer side of the heating tube 5, the hot air circularly heats food in the frying basket through the internal circulation air outlet groove 11 in the air frying pan cover 18, the other part of hot air flows to the internal circulation air inlet hole 6 in the air frying pan cover 18 from the center of the bottom of the frying basket through the driving of the convection fan blade 9, and the hot air is supplied to the outer side of the heating tube 5 through the turbine fan blade 10, and the operation is circularly carried out.

The frying basket with the frying basket bracket is movably arranged in the pot liner, and oil after baking and frying food leaks to the bottom of the pot liner from the leakage hole of the frying basket. When the pot is cleaned, the pot liner and the frying basket are lifted out together and can be cleaned respectively, so that the pot is convenient to clean and maintain. The main control board selects the function electric control program of the air fryer, and the display board 7 displays the electric parameters of the air fryer function.

Finally, the operation of the electric cooker with air-frying function of the present application in cooking is described.

The upper shell 1 is provided with the rice cooker cover 17, the rice cooker switch 20 and the air fryer switch 21 are simultaneously conducted (or only the rice cooker switch 20 can be conducted), and at the moment, the upper shell and the lower shell are closed, so that the function of the rice cooker is started. When the upper shell is opened in the running process of the electric cooker function, the current electric cooker function is not influenced.

In this case, the pot core is merely placed above the lower heat generating plate to cook the food. When in cleaning, the inner pot can be movably separated from the outer pot, which is convenient for users to clean and maintain. The main control board selects the electric control program of the electric cooker function, and the display board 7 displays the electric parameters of the electric cooker function.

In summary, compared with the prior art, the electric cooker with the air-frying function has the advantages that the turbine blades are larger than the blowing coverage of the convection blades, so that the turbine blades are arranged in the center of the heating pipe, heat of the heating pipe can be uniformly blown to food under the action of the turbine blades, 360-degree dead angles are really achieved, the food is heated more uniformly, and even the food closest to the heating pipe cannot be scorched.

Moreover, the structure of the electric cooker with the air-frying function can effectively reduce the height of the assembly, and can reduce the height by 40mm compared with the existing electric cooker with the air-frying function on the market, so that the product has smaller volume, compact and portable structure, can reduce the plastic materials of the shell, and can reduce the product cost and the production process requirement.

In addition, in the electric cooker with the air-frying function, the heating pipe and the turbine fan blade are fixedly arranged on the same horizontal height, so that the electric cooker is more convenient for a user to clean and maintain.

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.