Easy-to-clean electric rice cooker

Abstract

The application discloses an easy-to-clean electric rice cooker, which comprises a cooker body, a cooker cover, an inner container for cooking rice, a heating device and a cooling fan. The cooker body is provided with a containing cavity. The inner container is arranged in the containing cavity and located on the heating device. The cooker cover is closed to seal the containing cavity and the inner container to form a cooking cavity. The inner container is cooled by the cooling fan. The lower part of the inner container in contact with the rice is cooled to form condensed water. The condensed water infiltrates the rice adhering to the inner wall of the inner container. A first air outlet is arranged at the joint of the cooker cover and the cooker body. The joint gap between the cooker cover and the cooker body forms the first air outlet. The cold air is discharged through the first air outlet after cooling the inner container. The electric rice cooker has good non-stick effect without coating and is convenient to clean.

Description

[0001] This application claims to be a divisional application of the following Chinese patent application:

[0002] Chinese Patent Office on December 6, 2021, with the application number 202111472568.X, and the invention name of "an easy-to-clean electric rice cooker". TECHNICAL FIELD

[0003] The present application belongs to the technical field of kitchen utensils, and specifically relates to an easy-to-clean electric rice cooker. BACKGROUND

[0004] The existing electric rice cookers will set a non-stick coating on the inner surface of the inner pot to achieve the non-stick effect of rice. However, the service life of this non-stick coating is limited during user use, and it is easy to fall off due to high temperature or scratching, thereby failing to achieve the non-stick effect of the inner pot for a long time. Moreover, the fallen coating is easy to mix into the rice and be mistakenly eaten by people, affecting human health. After the coating falls off, the base of the inner pot will be exposed, which directly exposes the base to the high-temperature and high-humidity cooking environment during cooking, affecting food hygiene and safety. Therefore, when the coating falls off, the inner pot is not suitable for continued use. When the inner pot is made without coating (such as using stainless steel on the inner surface of the inner pot), the rice is easy to stick to the pot, and the rice spoon is not easy to shovel off the rice adhered to the surface of the inner pot during rice serving.

[0005] Currently, some electric rice cookers that achieve non-stick by cooling the inner pot have been disclosed, without setting a coating. However, the anti-sticking effect is not good, and due to the inability to uniformly cool the inner pot, there are still some places where the rice sticks to the pot. SUMMARY

[0006] The present application provides an easy-to-clean electric rice cooker to solve the problem of poor non-stick effect of the electric rice cooker without coating.

[0007] The technical solution adopted by the present application is as follows:

[0008] An easy-to-clean electric rice cooker, comprising a pot body, a pot cover, an inner pot for cooking rice, a heating device, and a cooling fan, the pot body is provided with a containing cavity, the inner pot is placed in the containing cavity and located on the heating device, the pot cover is closed to seal the containing cavity and the inner pot to form a cooking cavity, the pot body comprises a heat preservation inner cover provided with an air inlet, the cooling fan is arranged at the air inlet, and the inner pot has a heat preservation gap between the outer side wall and the inner wall of the heat preservation inner cover, the air inlet is provided with an air inlet angle towards the lower part of the inner pot to reduce the wind resistance of the cold air entering the heat preservation gap, the cold air entering the air inlet circulates around the inner pot from bottom to top to cool the lower part of the inner pot, the part of the inner pot contacting the rice is cooled and cooled, the water vapor in the rice condenses on the inner wall of the part of the inner pot contacting the rice to form condensed water, and the condensed water wets the rice adhered to the inner wall of the inner pot.

[0009] The easy-to-clean electric rice cooker further comprises the following technical features

[0010] The combination of the cover and the body is provided with a first air outlet, and the cold air is discharged through the first air outlet after cooling the inner container.

[0011] The air inlet angle is between 10-20 degrees, and the air inlet angle is the included angle between the air inlet direction and the vertical direction of the heat preservation inner cover.

[0012] The air inlet is provided with an air guide piece and an air guide channel, and the air guide piece makes the cold air entering the heat preservation gap of the air inlet have an air inlet angle.

[0013] The air guide piece has an air guide surface, and the air guide surface is arranged in an arc shape from the side of the cooling fan to the side of the heat preservation gap.

[0014] The air guide piece has an air guide surface, and the air guide surface is arranged in an arc shape from the side of the cooling fan to the side of the heat preservation gap.

[0015] The air guide channel includes a first air guide channel for sending cold air to the side wall of the inner container, and a second air guide channel for sending cold air to the heat preservation gap.

[0016] The outer side wall of the lower part of the inner container has an arc-shaped side wall and a flat bottom wall, and the inner side wall of the lower part of the inner container corresponds to the arc-shaped side wall and the flat bottom wall. The part is a spherical inner wall.

[0017] The lower part of the inner container has a flat bottom part with horizontal inner and outer walls, and the surface area of the inner wall of the flat bottom part is smaller than that of the outer wall.

[0018] The outer side wall of the lower part of the inner container is provided with a groove or a protrusion.

[0019] Due to the above technical scheme, the application has the following beneficial effects:

[0020] The cooling fan works, inhales cold air through the air inlet, and sends air to the containing cavity. The air outlet direction of the air inlet and the vertical direction of the body form a certain included angle, so that the air inlet is provided with an air inlet angle towards the lower part of the inner container to reduce the air resistance of the cold air entering the heat preservation gap. After the cold air with a certain air inlet angle enters the heat preservation gap, the cold air circulates around the lower part of the inner container from top to bottom to cool the lower part of the inner container. When the inner container contains cooked rice, the high-temperature steam in the rice will condense on the part of the inner wall of the lower part of the inner container that contacts the rice. The condensed water formed by condensation infiltrates the rice adhered to the inner wall of the inner container. At this time, the temperature difference between the inner and outer of the cooled inner container is low inside and high outside, that is, from outside to inside, the temperature gradually increases. Therefore, the part of the inner wall that contacts the rice can continuously have condensed water to infiltrate the rice, thereby avoiding non-stick and facilitating cleaning.

[0021] The air flow of the existing cooling fan is difficult to uniformly act on the lower part of the inner container when forming condensate water, so that the inner wall of each part contacting the rice can maintain the existence of condensate water, resulting in poor non-stick effect.

[0022] A certain air inlet angle makes the cold air first go down and then go up around the lower part of the inner container, so that the air flow mainly flows in the vertical direction rather than in the horizontal direction. From the perspective of the path of the cold air first going down and then going up in the vertical direction, when the air flow blown by the air inlet moves downward, a convergence effect is formed due to the gradual decrease of the surface area, and when the air flow moves upward, a diffusion effect is formed due to the gradual increase of the surface area. The convergence effect makes the cold air first contact a large area and then contact a small area when contacting the inner container, and further makes the cold air have a large contact area to absorb more heat when being relatively cold, so as to have a small contact area to absorb less heat when being relatively hot after convergence, thereby avoiding the problem of excessive heat absorption of the cold air at the small contact area due to overcooling of the cold air, and further causing uneven formation of condensate water contacting the rice in each part. After the convergence effect, the cold air has been warmed up, and on this basis, when diffusing upward, the cold air will not absorb much heat at the small contact area, causing uneven cooling, and thus having good non-coating non-stick effect. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 is a sectional view of the electric rice cooker according to an embodiment of the present application;

[0025] Figure 2 is a diagram of the electric rice cooker according to an embodiment of the present application in an open state;

[0026] Figure 3 is a partial schematic view of a part of the inner container contacting the rice according to an embodiment of the present application;

[0027] Figure 4 is a partial schematic view of the combination of the pot cover and the pot body according to an embodiment of the present application;

[0028] Figure 5 is a schematic view of the second steam outlet according to an embodiment of the present application;

[0029] Figure 6 is a schematic view of the inner container according to an embodiment of the present application;

[0030] Figure 7 is a schematic view of the inner container with a spherical inner wall according to an embodiment of the present application;

[0031] Figure 8 Fig. 8 is a schematic view of an inner container with a groove according to an embodiment of the present application;

[0032] Figure 9 Fig. 9 is a partial enlarged schematic view of a cooling fan on a heat preservation inner cover according to an embodiment of the present application;

[0033] Figure 10 Fig. 10 is a schematic view of a cooling fan according to an embodiment of the present application.

[0034] Wherein:

[0035] 10 pot body; 101 heat preservation inner cover; 102 outer pot shell; 103 base; 104 pot ring; 105 heating device; 106 accommodating cavity; 107 heat preservation gap; 108 air inlet; 109 air suction port; 110 first air outlet; 111 bottom gap; 112 air outlet channel; 113 second air outlet; 114 inner cavity; 115 support;

[0036] 20 pot cover;

[0037] 30 inner container; 301 cooking cavity; 302 lower part of inner container; 303 waist part of inner container; 304 upper part of inner container; 305 inner container flange; 306 arc-shaped side wall; 307 flat bottom wall; 308 spherical inner wall; 309 groove; 310 flat bottom part;

[0038] 40 cooling fan; 41 air guide piece; 42 air guide channel; 43 air guide surface; 44 upper air guide piece; 45 lower air guide piece; 46 air guide gap; 421 first air guide channel; 422 second air guide channel;

[0039] 50 rice;

[0040] 60 condensed water. DETAILED DESCRIPTION

[0041] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0042] In the following description, a lot of specific details are set forth in order to fully understand the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0043] In addition, in the description of the present application, it should be understood that the terms "inner", "outer" and the like indicate the position or location relationship based on the position or location relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0044] In this application, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, and can also be communication; can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description of the terms "embodiment", "example", "one embodiment", "exemplary" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0046] As Figures 1-3 An easy-to-clean electric rice cooker is shown, which comprises a cooker body 10, a cooker cover 20, an inner container 30 for cooking rice, a heating device 105, and a cooling fan 40. The cooker body 10 is provided with a receiving cavity 106, and the inner container 30 is placed in the receiving cavity 106 and located on the heating device 105. The cooker cover 20 is closed to seal the receiving cavity 106 and the inner container 30 to form a cooking cavity 301. The cooker body 10 comprises a heat preservation inner cover 101 provided with an air inlet 108, and the cooling fan 40 is arranged at the air inlet 108. There is a heat preservation gap 107 between the outer side wall of the inner container 30 and the inner wall of the heat preservation inner cover 101. The air inlet 108 is provided with an air inlet angle towards the lower part 302 of the inner container to reduce the air resistance of the cooling air entering the heat preservation gap 107. The cooling air entering the air inlet 108 circulates around the inner container 30 from bottom to top to cool the lower part 302 of the inner container, and the part of the inner container 302 contacting the rice 50 is cooled and cooled. The water vapor in the rice 50 condenses on the inner wall of the part of the inner container 302 contacting the rice 50 to form condensed water 60, and the condensed water 60 infiltrates the rice 50 adhering to the inner wall of the inner container 30.

[0047] It should be noted that the pot cover 20 and the pot body 10 can be hingedly arranged or separately arranged. The user can take out or put in the inner container 30 for cooking rice or take the rice by opening or closing the pot cover 20. The inner container 30 can be placed in the accommodating cavity 106 of the pot body 10, and the heating is realized by the heating device 105 at the bottom. In the embodiment, the heating device 105 is an electromagnetic wire disc. The alternating magnetic field generated by the electromagnetic wire disc when electrified is used to heat the inner container 30. The heat preservation inner cover 101 is arranged inside to form an accommodating cavity 106 for accommodating the inner container 30. The bottom of the heat preservation inner cover 101 is fixed with the heating device 105. For the electromagnetic wire disc as the heating device 105, the bottom side of the heat preservation inner cover 101 has a bottom opening. The electromagnetic wire disc is connected to the bottom opening, so that the electromagnetic wire disc is directly connected to the heat preservation inner cover 101. The accommodating cavity 106 is formed by the combination of the heat preservation inner cover 101 and the electromagnetic wire disc. When the pot cover 20 is closed, the accommodating cavity 106 is relatively closed except that the combination part of the pot cover 20 and the pot body 10, the temperature measuring hole and the water leakage hole at the bottom can communicate with the outside space. Therefore, the entire accommodating cavity 106 is relatively closed. If the heating device 105 is a heating disc, there will be more openings at the bottom of the entire accommodating cavity 106, such as the avoidance hole for the terminal to extend out of the heat preservation inner cover 101.

[0048] The pot body 10 further includes a pot ring 104, an outer pot shell 102 and a base 103. The outer pot shell 102 is arranged outside the heat preservation inner cover 101. In order to fix the heat preservation inner cover 101 and the outer pot shell 102, the pot ring 104 is connected with the base 103. The outer pot shell 102 is arranged between the pot ring 104 and the base 103. The heat preservation inner cover 101 is arranged on the pot ring 104. The inner cavity 114 is formed between the outer pot shell 102 and the heat preservation inner cover 101. For the electric rice cooker with the electromagnetic wire disc as the heating device 105, the base 103 is provided with an air inlet 109. The cooling fan 40 can suck air through the air inlet 109 on the base 103.

[0049] As Figure 6 The inner container 30 includes an inner container waist part 303, an inner container lower part 302 and an inner container upper part 304. The diameter of the inner container waist part 303 is greater than that of the inner container lower part 302. In some embodiments, the diameter of the inner container waist part 303 is also greater than that of the inner container upper part 304. The inner container lower part 302 includes an arc-shaped side wall 306 and a flat bottom wall 307. The specific container shape is described in detail below.

[0050] The traditional inner pot is not cooled, and there is no temperature difference between the inner and outer pot, or the temperature of the inner pot as a heat source is sometimes higher than the temperature of the rice, which is not sufficient to condense the condensed water on the inner wall of the lower part 302 of the inner pot that contacts the rice, so the rice is burnt and stuck to the pot. At this time, if the inner pot does not have a non-stick coating, it will be difficult to clean. In this embodiment, the cooling of the inner pot is completed by the cooling fan 40, as follows:

[0051] With reference to Figure 1 , the cooling fan 40 works, inhales cold air through the air inlet 108, and sends air to the accommodation cavity 106. The air outlet direction of the air inlet 108 is at a certain angle with the vertical direction of the pot body 10, so that the air inlet 108 is provided with an air inlet angle towards the lower part 302 of the inner pot to reduce the air resistance of the cold air entering the heat preservation gap 107. After the cold air with a certain air inlet angle enters the heat preservation gap 107, the cold air circulates around the lower part 302 of the inner pot from top to bottom to cool the lower part 302 of the inner pot. When the inner pot 30 contains cooked rice, the high-temperature water vapor in the rice will condense on the inner wall of the lower part 302 of the inner pot that contacts the rice, and the condensed water will soak the rice that is in contact with the inner wall of the inner pot. At this time, the temperature difference between the inner and outer inner pot 30 after cooling is low inside and high outside, that is, from outside to inside, the temperature gradually increases, so that the inner wall that contacts the rice can continuously have condensed water to soak the rice, thereby avoiding non-stick and facilitating cleaning.

[0052] When the condensed water is formed, the airflow of the existing cooling fan 40 is difficult to uniformly act on the lower part 302 of the inner pot, so that the inner wall of each part that contacts the rice can maintain the existence of condensed water, which causes poor non-stick effect.

[0053] The certain air inlet angle can reduce the air resistance entering the gap 107, increase the air inlet amount, and make the cold air first cool the lower part 302 of the inner container and then circulate around the inner container to cool the lower part 302 of the inner container. In the vertical direction, the diameter of the waist part 303 of the inner container is often large, and the diameter of the inner container gradually decreases downwards, so that when the air flow moves downwards, the surface area gradually decreases as the air flow is closer to the bottom of the inner container 30, and when the air flow moves upwards, the surface area gradually increases as the air flow is farther away from the bottom of the inner container 30. In the horizontal direction, due to the existence of the cylindrical surface, the curvature gradually increases from the left side of the inner container 30 to the center line, and the curvature gradually decreases from the center line to the right side. When the air flow moves to the left and right sides, the surface area gradually increases as the air flow is closer to the center line of the inner container 30 after the air flow just flows out of the air inlet 108, and the surface area gradually decreases as the air flow is farther away from the center line after the air flow passes the center line. The certain air inlet angle makes the cold air first flow downwards and then upwards around the lower part 302 of the inner container, so that the air flow mainly flows in the vertical direction rather than in the horizontal direction. From the path of the cold air flowing downwards and then upwards, the converging effect is formed due to the gradually decreasing surface area when the air flow moves downwards, and the diffusing effect is formed due to the gradually increasing surface area when the air flow moves upwards. The converging effect makes the cold air first contact a large area and then contact a small area when the cold air contacts the inner container 30, so that the cold air can absorb more heat when the cold air is relatively cold and has a large contact area, and then absorb less heat when the cold air is relatively hot and has a small contact area, thereby avoiding the problem that the condensed water of the rice in contact with the inner container is not uniform due to the overcooling of the cold air in the converging place and the over-absorption of heat in the small contact area. After the converging effect, the cold air has been warmed up, and when the cold air diffuses upwards, the cold air will not absorb much heat in the small contact area, thereby avoiding the problem of uneven cooling.

[0054] As shown in Figure 4 to form the air flow flowing downwards and then upwards, a first air outlet 110 is arranged at the joint between the pot cover 20 and the pot body 10. The joint between the pot cover 20 and the pot body 10 forms a gap, and the gap forms the first air outlet 110. The cold air is discharged through the first air outlet 110 after cooling the inner container 30. The air discharge through the first air outlet 110 means that the bottom and the side wall of the containing cavity 106 are as closed as possible, and the holes are as few as possible to avoid the air flow from the bottom and the side wall. Preferably, the heating device 105 is the electromagnetic wire disc described above, and the electromagnetic wire disc is installed at the opening at the bottom of the heat preservation cover 101.

[0055] In the embodiment, as shown in Figure 3As shown, the inner container 30 is placed in the accommodating cavity 106 of the pot body 10, the heating device 105 is arranged at the lower side of the heat preservation inner cover 101, and the heating device 105 and the inner container 30 have a bottom gap 111 therebetween. In order to form the bottom gap 111, the inner container 30 has an inner container flange 305, the inner container flange 305 has an air outlet passage 112 at the matching position of the pot body 10, and the airflow in the heat preservation gap 107 enters the first air outlet 110 through the air outlet passage 112. The air outlet passage 112 is arranged so that the airflow changes the airflow direction under the blockage of the inner container flange 305, so that the hot air can more conveniently enter the first air outlet 110 and be discharged.

[0056] In some alternative embodiments of the present embodiment, as shown in Figure 5 As shown, the second air outlet 113 is arranged at the side of the cooling fan 40, and the second air outlet 113 communicates with the inner cavity 114 between the heat preservation inner cover 101 and the outer pot shell 102. The bottom of the pot body 10 is provided with a heat dissipation hole communicating with the inner cavity 114. After the cooling air cools the inner container 30, the cooling air is discharged into the inner cavity 114 through the second air outlet 113, and then discharged through the heat dissipation hole.

[0057] The side means close to the cooling fan 40, and the distance between the cooling fan 40 and the second air outlet 113 is not greater than 10 cm. The height position of the second air outlet 113 can be flush with the cooling fan 40. Of course, in some specific embodiments, the orientation of the second air outlet 113 can be located at other positions.

[0058] As shown in Figure 2 , 4 As shown, the pot ring 104 has a support 115 arranged at the matching position, and the inner container 30 is supported on the support 115 to form the air outlet passage 112. The support 115 can be arranged in multiple numbers, and the air outlet passage 112 is formed between adjacent supports 115. The support 115 is arranged to facilitate the hanging of the inner container 30 on the pot ring 104, and can form the isolation gap and the air outlet passage 112, and has a simple structure.

[0059] The condensate water forming process needs cooling time, and the cooling time cannot be too long. In order to shorten the cooling time, the method that can be used is to reduce the surface area of the lower part 302 of the inner container 30 contacting the rice as much as possible, so as to reduce the power required for forming the condensate water.

[0060] The condensate water forming process is estimated and analyzed. The temperature of the inner container 30 at the end of cooking is about 100-110℃, and the temperature of the rice is 100℃. It is estimated that the sum of the heat release of the inner container 30 and the heat release of the water vapor condensation is equal to the heat carried away by the blowing of the cooling fan 40.

[0061] Take the cooling fan 40 delivered by the cold air 150L / min, the inner container cooling to 95℃, for example, ΔT 内胆 Take 15℃, the cold air temperature rise ΔT 空气 Take 30℃.

[0062] The heat Q released by the inner container cooling 内胆 = m 内胆 c 内胆 ΔT 内胆 ;

[0063] The heat Q released by the water vapor condensation 水层 = m 水层 △H 水 ;

[0064] The heat Q taken away by the cold air per minute 空气 = m 空气 c 空气 ΔT 空气 ;

[0065] The time required to form the condensate water is (Q 内胆 +Q 水层 ) / Q 空气 ;

[0066] The relevant parameters and numerical values are as follows:

[0067]

[0068]

[0069] Through the above estimation, it can be found that about 4 minutes of cooling time can form a condensate water layer, and the extension of 4 minutes of time is within the acceptable range of rice cooking, and can be added to the rice cooking. A small fan with a flow rate of 150L / min, about 50mm in diameter, can be realized, so this scheme has high applicability.

[0070] Through the test and verification of the prototype, the cooling fan 40 cooling for 3-5 minutes can cool the inner surface of the inner container to about 95℃, and the inner wall surface of the inner container forms a water layer, so that the rice is not easy to stick to the inner container.

[0071] Through the above calculation, it can be found that the material, shape and weight of the inner container affect the area of the water layer, the specific heat capacity of the inner container, the mass of the inner container, and the temperature rise of the cold air. Therefore, the cooling time can be controlled by improving the structure of the inner container.

[0072] Specifically, in some embodiments, such as Figure 7As shown, the outer side wall of the inner container lower portion 302 has an arc-shaped side wall 306 and a flat bottom wall 307, the inner side wall of the inner container lower portion 302 corresponding to the arc-shaped side wall and the flat bottom wall is a spherical inner wall 308; the spherical inner wall 308 can minimize the surface area of the part of the inner container lower portion 302 contacting the rice, thereby minimizing the cooling time. The arc-shaped side wall 306 refers to the profile of the outer side wall of the inner container in the vertical direction being arc-shaped, the arc-shaped side wall 306 rotating around an axis to form an arc surface, and the arc of the arc-shaped side wall 306 can be an arc with different curvatures, rather than a circular arc with the same curvature, meaning that the curved surface of the inner container lower portion 302 can be aspherical. The flat bottom wall 307 is used to enable the inner container to be placed flat on a table top, and the flat bottom wall 307 refers to the outer side wall of the inner container being horizontally arranged. By arranging the outer flat and inner curved, not only can the experience of taking and placing the inner container be unaffected, but also, due to the arrangement of the spherical inner wall 308, the surface area of the rice contacting the inner container can be minimized for the same amount of rice, thereby reducing the energy released by the condensation of water vapor, and further shortening the cooling time.

[0073] Further, in some embodiments, as shown in Figure 7 the wall thickness B1 between the spherical inner wall 308 and the flat bottom wall 307, and the wall thickness B2 between the spherical inner wall 308 and the arc-shaped side wall 306 satisfy B1≤B2. Here, B1 and B2 can be the minimum thickness or the average thickness, and generally, the wall thickness of the inner container is not less than 0.5 mm and not more than 10 mm, which can be set according to the situation. When B1≤B2, the outer flat and inner curved inner container is as light and thin as possible, the weight of the inner container is reduced, and the heat storage capacity of the inner container is further reduced, thereby facilitating the cooling of the inner container to quickly form condensed water.

[0074] In order to facilitate processing, the inner container is usually formed by stamping, so that the wall thickness of the inner container remains consistent, and the shape of the inner and outer walls also remains consistent. Therefore, in some embodiments, as shown in Figure 8 the inner container lower portion 302 has a flat bottom 310 with the inner and outer walls being horizontally arranged, and the surface area of the inner wall of the flat bottom 310 is smaller than that of the outer wall. In order to make the surface area of the inner wall smaller than that of the outer wall, a groove 309 or a protrusion can be provided on the outer side wall of the inner container lower portion 302. Since the outer wall of the flat bottom 310 is provided with a groove 309 or a protrusion, the surface area of the outer wall of the flat bottom 310 is increased, which increases the temperature rise of the cold air, thereby increasing the heat carried away by the cold air per minute, and further shortening the cooling time.

[0075] In some embodiments, a groove 309 or a protrusion can also be provided on the arc-shaped side wall 306 or the flat bottom wall 307, thereby increasing the surface area of the outer side of the inner container lower portion 302, which further increases the difference between the inner and outer surface areas of the outer flat and inner curved inner container, and forms the arrangement of the inner and outer surface areas of the part contacting the rice being "larger on the outside and smaller on the inside", thereby accelerating the formation of condensed water.

[0076] In order to improve the cooling effect, the air volume of the cold air can also be adjusted. For the cooling fan 40, due to the existence of air duct resistance, assuming that the rated air volume is 200 L / min, the actual loss will make the air volume decrease to below 200 L / min, so the air inlet resistance can be reduced to increase the air volume, thereby reducing the cooling time.

[0077] As shown in Figure 9 The air inlet 108 is provided with a guide vane 41 and a guide channel 42. The guide vane 41 makes the cold air entering the heat preservation gap 107 from the air inlet 108 have an air inlet angle. Preferably, the air inlet angle of the guide vane 41 entering the heat preservation gap 107 is between 10-20 degrees. The included angle is the included angle between the tangential direction of the guide vane 41 at the air inlet 108 and the vertical direction of the heat preservation inner cover 101. In the embodiment, the air inlet angle is 18 degrees. In some alternative embodiments, the included angle can be 10, 12, 15, 20 degrees, etc. When the air inlet angle is less than 10 degrees, it will make the guide channel 42 not easy to be molded, and the processing difficulty is large. If it is greater than 20 degrees, it will make the cold air act more on the inner wall of the inner tank, thereby increasing the air resistance.

[0078] The guide vane 41 has a guide surface 43 which is arranged in an arc shape from the side of the cooling fan 40 to the side of the heat preservation gap 107. In this way, when the cold air blown by the cooling fan 40 passes through the guide vane 41, the cold air can smoothly transition from the horizontal direction to the preset air inlet angle to enter the heat preservation gap 107, avoiding the loss of air volume caused by unreasonable design of the guide vane 41, further reducing the air resistance of the guide vane 41, thereby increasing the air inlet volume, and further improving the cooling efficiency.

[0079] The upper guide vane 44 and the lower guide vane 45 constituting the guide channel 42 do not overlap in the horizontal direction, for example, the lower end of the upper guide vane 44 and the upper end of the lower guide vane 45 have a guide gap 46 in the height direction of the heat preservation inner cover 101. The existence of the guide gap 46 can make the guide vane 41 easy to be molded, and also can reduce the air resistance of the guide channel 42.

[0080] As shown in Figure 10As shown, the air guide channels 42 include first air guide channels 421 for guiding cold air to the sidewall of the inner container 30, and second air guide channels 422 for guiding cold air to the heat preservation gap 107; each air guide channel 42 is located at the height of the arc-shaped sidewall 306 of the lower portion 302 of the inner container, wherein the first air guide channels 421 are located at the largest diameter of the lower portion 302 of the inner container, and the air inlet angle of the first air guide channels 421 intersects with the arc-shaped sidewall 306, so that the cold air of the first air guide channels 421 can be guided to the waist portion 303 of the inner container; since the sidewall of the waist portion has a large diameter, the surface area is large, and the cold air guided by the air guide channels can be cooled, which facilitates the convergence effect, so as to ensure the uniformity of the cooling of the lower portion 302 of the inner container; the air inlet angle of the second air guide channels 422 is arranged away from the arc-shaped sidewall 306, so that the cold air of the second air guide channels 422 can be guided to the heat preservation gap 107 instead of the sidewall of the inner container, which can reduce the air resistance, improve the air inlet amount, and shorten the cooling time. The first air guide channels 421 and the second air guide channels 422 have a plurality of air guide channels; in this embodiment, the first air guide channels 421 and the second air guide channels 422 each have two air guide channels.

[0081] The cooling fan 40 is arranged at the diagonal position of the outer pot shell 102, and the inner cavity 114 between the outer pot shell 102 and the heat preservation cover 101 has the largest space at the diagonal position, which facilitates the air suction of the cooling fan 40, reduces the air resistance, and improves the air inlet amount.

[0082] The places not described in the present application can be realized by using or referring to the existing technology.

[0083] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the differences from other embodiments.

[0084] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. An easy-to-clean electric rice cooker, comprising a cooker body, a cooker cover, an inner container for cooking rice, a heating device, and a cooling fan, the cooker body is provided with a receiving cavity, the inner container is placed in the receiving cavity and located on the heating device, the receiving cavity is closed by the cooker cover to form a cooking cavity, characterized in that the cooker body comprises an air inlet, the cooling fan is arranged at the air inlet, the air inlet is provided with an air inlet angle for reducing the air resistance of the cooling air, the cooling air entering the air inlet circulates around the inner container from bottom to top to cool the lower part of the inner container; the inner container is cooled by the cooling fan, the part of the lower part of the inner container contacting the rice is cooled to form condensate, and the condensate wets the rice adhering to the inner wall of the inner container. A first air outlet is arranged at the joint of the cooker cover and the cooker body, and a joint gap is formed between the cooker cover and the cooker body to form the first air outlet, and the cooling air after cooling the inner container is discharged through the first air outlet.

2. The easy-to-clean electric rice cooker according to claim 1, characterized in that the inner container has an inner container flange, the joint of the inner container flange and the cooker body is provided with an air outlet channel, the cooker body comprises a heat preservation inner cover, and a heat preservation gap is formed between the outer sidewall of the inner container and the inner wall of the heat preservation inner cover, and the airflow in the heat preservation gap enters the first air outlet through the air outlet channel.

3. The easy-to-clean electric rice cooker according to claim 1, characterized in that the cooker body comprises a heat preservation inner cover and a second air outlet, the second air outlet communicates with an inner cavity between the heat preservation inner cover and an outer pot shell, and the bottom of the cooker body is provided with a heat dissipation hole communicating with the inner cavity, and the cooling air after cooling the inner container is discharged into the inner cavity through the second air outlet and then discharged through the heat dissipation hole.

4. The easy-to-clean electric rice cooker according to claim 3, characterized in that the second air outlet is arranged beside the cooling fan, and the beside means that the second air outlet is arranged close to the cooling fan with a distance of not more than 10 cm from the cooling fan.

5. The easy-to-clean electric rice cooker according to claim 3, characterized in that the height position of the second air outlet is flush with the cooling fan. The cooker body further comprises a pot ring, the pot ring is provided with a support, the support is arranged at the joint, and the inner container is supported on the support to form the air outlet channel. A plurality of supports are arranged, and the air outlet channel is formed between adjacent supports.

8. The easy-to-clean electric rice cooker according to claim 1, characterized in that the outer sidewall of the lower part of the inner container has an arc-shaped sidewall and a flat bottom wall, and the inner sidewall of the lower part of the inner container is a spherical inner wall corresponding to the arc-shaped sidewall and the flat bottom wall.

9. The easy-to-clean electric rice cooker according to claim 1, characterized in that the lower part of the inner container has a flat bottom part provided with an inner wall and an outer wall, and the surface area of the inner wall of the flat bottom part is smaller than that of the outer wall.

10. The easy-to-clean electric rice cooker according to any one of claims 8-9, characterized in that the outer sidewall of the lower part of the inner container is provided with a groove or a protrusion.

6. The easy-to-clean rice cooker according to claim 2, wherein ​ 7. The easy-to-clean rice cooker according to claim 6, wherein ​ ​ ​ ​ ​ ​ ​

Images