Electric rice cooker cast iron liner and electric rice cooker

Abstract

The invention discloses a cast iron inner pot of an electric rice cooker and an electric rice cooker, wherein the inner pot comprises a pot body and a pot cover; the pot body is a single-layer cast iron pot body, and the pot cover is also made of cast iron; the pot body comprises a pot bottom, a pot wall and a pot rim, the connection between the pot wall and the pot bottom is arranged in an arc transition, and at the same time, the top of the pot wall is horizontally extended outward to be provided with a pot rim, and the middle part of the pot rim is sunken and provided with an annular groove; the pot cover comprises an integrally formed pot cover body and a handle, the bottom of the pot cover body is bent downward to be provided with a lid lower edge, wherein the middle part of the bottom end of the lid lower edge is provided with an annular convex ridge; the cast iron inner pot of the invention is sturdy and durable, not easy to deform or damage, does not contain chemicals harmful to the human body, and is safe and reliable to use; and effectively prevents steam leakage. This sealing property can not only ensure temperature stability during cooking, but also prevent the nutritional components of food from being lost with the steam.

Description

Technical Field

[0001] The invention relates to the field of electric rice cookers, in particular to a cast iron inner pot of an electric rice cooker and the electric rice cooker. Background Art

[0002] As living standards improve, rice cookers have become a must-have household appliance, and their performance and functionality are increasingly attracting attention. Existing rice cookers often use aluminum inner pots, primarily due to aluminum's excellent thermal conductivity and low cost. However, aluminum inner pots cannot come into direct contact with food and require surface protection. The commonly used non-stick coating can peel off with long-term use or improper cleaning, exposing the aluminum layer and potentially causing adverse health effects.

[0003] A cast iron pot has a characteristic that when the temperature of the fire exceeds 200°C, the cast iron pot will release a certain amount of heat energy to control the temperature of the food at 230°C. Therefore, there are some electric rice cookers with cast iron inner pots in the existing technology. However, the existing cast iron pots generally have the problem of poor sealing. Since there is a gap between the pot body and the pot lid of the existing cast iron pot, steam can easily leak from the steam, resulting in insufficient temperature inside the pot body, making it unsuitable for cooking.

[0004] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0005] The object of the present invention is to provide a cast iron inner pot for an electric rice cooker and an electric rice cooker, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electric rice cooker made of cast iron, the inner pot comprises a pot body and a pot cover;

[0008] The pot body is a single-layer cast iron pot body, and the pot cover is also made of cast iron;

[0009] The pot body includes a pot bottom, a pot wall and a pot edge. The connection between the pot wall and the pot bottom is set in an arc transition. At the same time, the top of the pot wall is horizontally extended outward to form a pot edge. The middle part of the pot edge is sunken and provided with an annular groove.

[0010] The pot cover comprises an integrally formed pot cover body and a handle. The bottom of the pot cover body is bent downward to form a lid bottom edge, wherein a ring-shaped ridge is provided at the middle of the bottom end of the lid bottom edge. The ridge is located in the groove and cooperates with the groove. The ridge and the groove are concentrically arranged.

[0011] The groove on the pot body and the ridge on the pot cover are arranged in a coordinated manner. When the pot cover is buckled onto the pot body, the ridge is located in the groove. There is a gap between the ridge and the groove. Since the pot edge and the lower edge of the lid cannot be processed to be completely flat, there is also a gap between the pot edge and the lower edge of the lid. A tortuous flow channel is formed between the pot edge, the groove, the lower edge of the lid and the ridge.

[0012] The steam first passes through the flow channel A between the pot edge and the bottom edge of the lid, then enters the flow channel B between the side of the ridge and the side of the groove, then enters the flow channel C between the bottom of the ridge and the bottom of the groove, then enters the flow channel D between the side of the ridge and the side of the groove, and finally passes through the flow channel E between the pot edge and the bottom edge of the lid. The widths of the flow channels B and D are greater than the widths of the flow channels A, C, and E.

[0013] When the steam is in channel A, due to its narrow and straight shape, its pressure and temperature decrease, while its velocity increases, meaning that part of the static pressure energy is converted into kinetic energy. When the steam enters channel B, the cross-sectional area of ​​the channel suddenly expands, causing the airflow to form a very strong vortex, and the velocity almost completely disappears. The kinetic energy is converted into thermal energy, causing the steam to rise to its original temperature, while the pressure in the cavity remains after the gap. The steam, with its pressure reduced, enters the narrow and straight channel C, where the pressure drops further, thus achieving the purpose of sealing. The steam then enters channel D, where the cross-sectional area increases, and then enters channel E, where the cross-sectional area decreases.

[0014] The pot cover is also provided with a micro-pressure valve, which can automatically release excess steam when the pressure in the pot exceeds the set value to prevent safety accidents caused by excessive pressure.

[0015] Furthermore, a retaining ring is provided on the edge of the pot rim extending vertically upward; the retaining ring is mainly used to limit the horizontal position of the pot cover when the pot cover is buckled on the pot body and the pot cover moves horizontally.

[0016] Furthermore, the width of the groove is 4 mm, and the width of the ridge is 2 mm.

[0017] Furthermore, the height of the ridges should also be smaller than the depth of the grooves.

[0018] Furthermore, a plurality of concentrically arranged annular grooves are provided in the middle of the pot edge. Similarly, a plurality of ridges matching the grooves are provided at the bottom of the lower edge of the lid.

[0019] Furthermore, the micro-pressure valve includes a pressure ball, and a connecting column is integrally formed at the center of the top of the pot cover. A first pressure relief channel is vertically opened at the center of the connecting column; and a pressure ball is arranged in the pressure relief channel.

[0020] Furthermore, the outer wall of the connecting column is integrally formed with an external thread, a second pressure relief channel is vertically provided in the handle, a connecting nut is embedded in the lower end of the second pressure relief channel, the connecting nut is engaged with the external thread, and the handle is threadedly connected to the top of the connecting column through the connecting nut.

[0021] Furthermore, a sealing plate is provided at the top of the second pressure relief channel, and the function of the sealing plate is to prevent the pressure ball from escaping from the top of the second pressure relief channel.

[0022] Furthermore, the sealing plate is provided with a through hole for discharging steam.

[0023] An electric rice cooker comprises a cast iron inner pot and an outer shell. The bottom of the outer shell is provided with supporting feet, the top of the outer shell is provided with a pot placement groove for placing a pot body, and the top of the outer shell is symmetrically provided with two pot-taking notches for a user to take the pot body out of the outer shell.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] Cast iron is durable and not easily deformed or damaged. The cast iron liner does not contain any harmful chemicals to the human body and is safe to use. Cast iron does not release harmful substances during cooking, ensuring the user's dietary health.

[0026] It effectively prevents steam leakage. This sealing not only ensures temperature stability during the cooking process, but also prevents the nutrients in the food from being lost with the steam, thereby ensuring the taste and nutritional value of the food. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the structure of a cast iron inner pot of an electric rice cooker.

[0028] Figure 2 The figure is a schematic diagram of the structure of the pot body in the cast iron inner pot of an electric rice cooker.

[0029] Figure 3 The figure is a schematic diagram of the structure of the pot cover in the cast iron inner pot of an electric rice cooker.

[0030] Figure 4 The figure is a schematic diagram of the structure of the handle in the cast iron inner pot of an electric rice cooker.

[0031] Figure 5 for Figure 1 A partial enlarged view of point a in the middle.

[0032] Figure 6 A schematic diagram of steam flowing through the channel between the pot body and the lid in the cast iron inner pot of an electric rice cooker.

[0033] Figure 7 It is a structural diagram of an electric rice cooker.

[0034] Figure 8 This is a front view of the rice cooker.

[0035] Figure 9 This is a top view of the rice cooker. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-5 , a cast iron inner pot of an electric rice cooker, comprising a pot body 1 and a pot cover 2;

[0038] The pot body 1 is a single-layer cast iron pot body, and the pot cover 2 is also made of cast iron;

[0039] Cast iron is strong and durable, not easy to deform or damage. After long-term use, the cast iron pot lid can still maintain good sealing and heat preservation.

[0040] Cast iron does not contain any chemicals that are harmful to the human body and is safe to use. Cast iron does not release any harmful substances during the cooking process, thus ensuring the user's dietary health.

[0041] The cast iron pot cover itself has the characteristics of high temperature resistance and corrosion resistance, which enables it to maintain good condition during use and extend its service life;

[0042] The pot body 1 includes a pot bottom 101, a pot wall 102 and a pot rim 103. The connection between the pot wall 102 and the pot bottom 101 is set in an arc transition. At the same time, the top of the pot wall 102 is horizontally extended outward to form a pot rim 103. The middle part of the pot rim 103 is sunken and provided with an annular groove 104.

[0043] The pot cover 2 includes an integrally formed pot cover body 201 and a handle 202. The bottom of the pot cover body 201 is bent downward to form a lid bottom edge 203, wherein a ring-shaped ridge 204 is provided at the middle of the bottom end of the lid bottom edge. The ridge 204 is located in the groove 104 and is provided in cooperation with the groove 104. The ridge 204 and the groove 104 are provided concentrically.

[0044] At the same time, a retaining ring 105 is provided vertically upwardly extending from the edge of the pot rim 103; the retaining ring 105 is mainly used to limit the horizontal position of the pot cover 2 when the pot cover is buckled on the pot body and the pot cover moves horizontally. Since the width of the ridge 204 is relatively small in this embodiment, and cast iron is relatively brittle despite its high hardness, the retaining ring 105 is provided to limit the horizontal movement of the pot cover 2 relative to the pot body, thereby preventing the ridge from hitting the groove 104 and causing breakage;

[0045] At the same time, in this solution, since the pot body 1 and the pot lid 2 are not made of transparent materials, and when they are fastened together, the user cannot directly see the groove 104 and the ridge; the retaining ring 105 cooperates with the edge of the bottom edge 203 of the lid and also plays a positioning role, so that the ridge can accurately fall into the groove;

[0046] In this solution, the groove 104 on the pot body 1 and the ridge 204 on the pot lid 2 are arranged in cooperation. When the pot lid is buckled on the pot body 1, the ridge 204 is embedded in the groove 104. This design forms a unique sealing mechanism between the pot lid and the pot body, thereby improving the heat preservation effect and steam utilization efficiency during the cooking process.

[0047] It effectively prevents steam leakage. This sealing not only ensures temperature stability during the cooking process, but also prevents the nutrients in the food from being lost with the steam, thereby ensuring the taste and nutritional value of the food.

[0048] The steam generated during the cooking process can be effectively utilized. Steam not only accelerates the cooking process of food, but also makes the food more tender and juicy. At the same time, this steam circulation can effectively maintain the humidity in the pot, preventing the food from being too dry or too burnt.

[0049] In this embodiment, the pot body 1 and the pot lid 2 are both made of cast iron. Considering the processing accuracy and cost, the grooves and ridges cannot be completely seamless, and there will definitely be a gap between the pot edge 103 and the lower edge 203 of the lid.

[0050] In this embodiment, the width of the groove 104 is 4 mm, and the width of the ridge 204 is 2 mm. At the same time, the height of the ridge 204 is also smaller than the depth of the groove 104.

[0051] Then in this solution, the sealing is not achieved by the perfect fit of the groove and the ridge; when the pot cover 2 is buckled on the pot body 1, the ridge is located in the groove, and there is a gap between the ridge and the groove. Since the pot edge 103 and the lower edge 203 of the lid cannot be processed to be completely flat, there is also a gap between the pot edge and the lower edge of the lid. At this time, the contact between the pot cover and the pot body 1 is as follows. Figure 6 As shown in the figure, a tortuous flow channel is formed between the pot edge, the groove, the bottom edge of the lid and the ridge.

[0052] When processing food, a large amount of high-temperature steam will be produced in the pot, and this high-temperature steam will accumulate in the pot and escape from the flow channel between the pot lid and the pot body.

[0053] The steam first passes through the flow channel A between the pot edge and the bottom edge of the lid, then enters the flow channel B between the side of the ridge and the side of the groove, then enters the flow channel C between the bottom of the ridge and the bottom of the groove, then enters the flow channel D between the side of the ridge and the side of the groove, and finally passes through the flow channel E between the pot edge and the bottom edge of the lid. The widths of the flow channels B and D are greater than the widths of the flow channels A, C, and E.

[0054] When the steam is in channel A, due to its narrow and straight shape, its pressure and temperature decrease, while its velocity increases, meaning that part of the static pressure energy is converted into kinetic energy. When the steam enters channel B, the cross-sectional area of ​​the channel suddenly expands, causing the airflow to form a very strong vortex, and the velocity almost completely disappears. The kinetic energy is converted into thermal energy, causing the steam to rise to its original temperature, while the pressure in the cavity remains after the gap. The steam, with its pressure reduced, enters the narrow and straight channel C, where the pressure drops further, thus achieving the purpose of sealing. The steam then enters channel D, where the cross-sectional area increases, and then enters channel E, where the cross-sectional area decreases.

[0055] The flow channel in this solution converts steam pressure into velocity, and then reduces the velocity to achieve internal and external pressure balance, thereby reducing the leakage of steam from high pressure to low pressure in the pot body, and thus achieving the sealing effect;

[0056] The tortuous flow path forms a "maze". The sealing principle of this scheme is the "maze effect", that is, the fluid generates resistance and reduces its flow rate when passing through the maze;

[0057] At the same time, in some embodiments of the present invention, the middle portion of the pot edge 103 is provided with multiple concentrically arranged annular grooves 104. Similarly, the bottom of the lid lower edge 203 is provided with multiple corresponding ridges 204 adapted to the grooves. In this embodiment, the flow channel between the pot edge 103 and the lid lower edge 203 is longer, and the sealing effect is better.

[0058] Because in the above scheme, steam will accumulate inside the pot body through the sealing mechanism between the lid and the pot body, and as the heating continues, the pressure of the steam will increase until the lid is pushed open; in order to avoid this situation;

[0059] In this solution, the pot cover 2 is also provided with a micro-pressure valve 3, which can automatically release excess steam when the pressure in the pot exceeds the set value to prevent safety accidents caused by excessive pressure;

[0060] The micro-pressure valve 3 includes a pressure ball 301.

[0061] Specifically, a connecting column 206 is integrally formed at the center of the top of the pot cover 2, and a first pressure relief channel 205 is vertically opened at the center of the connecting column 206; a pressure ball 301 is arranged in the pressure relief channel 205

[0062] The outer wall of the connecting column 206 is integrally formed with an external thread 207, and a second pressure relief channel 209 is vertically provided in the handle 202. A connecting nut 208 is embedded in the lower end of the second pressure relief channel 209.

[0063] The connecting nut 208 is engaged with the external thread 207, and the handle 202 is threadedly connected to the top of the connecting column 206 through the connecting nut 208. A sealing plate 302 is also provided at the top of the second pressure relief channel 209. The function of the sealing plate 302 is to prevent the pressure ball 301 from escaping from the top of the second pressure relief channel 209. At the same time, a through hole (not shown in the figure) is opened on the sealing plate 302 for discharging steam.

[0064] See also Figure 7-9 An electric rice cooker using the above-mentioned cast iron inner pot comprises an electric rice cooker cast iron inner pot and an electric rice cooker shell 4.

[0065] The bottom of the rice cooker housing 4 is provided with a supporting foot 401, the top of the rice cooker housing 4 is provided with a pot body placement groove 402 for placing the pot body 1, and the top of the rice cooker housing 4 is symmetrically provided with two pot-taking notches 403, which are used for the user to take out the pot body 1 from the rice cooker housing 4;

[0066] At the same time, the same as the prior art, a heating plate is provided inside the pot body for heating the cast iron inner pot of the rice cooker, and a sensor is used to control the heating amount of the heating plate. The specific structure thereof will not be described in detail again.

[0067] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

Claims

1. A cast iron inner pot for an electric rice cooker, comprising a pot body and a pot lid; The pot body is a single-layer cast iron pot body, and the pot cover is made of cast iron; The pot body includes a pot bottom, a pot wall and a pot edge. The connection between the pot wall and the pot bottom is set in an arc transition. At the same time, the top of the pot wall is horizontally extended outward to form a pot edge. The middle part of the pot edge is sunken and provided with an annular groove. The pot cover comprises an integrally formed pot cover body and a handle. The bottom of the pot cover body is bent downward to form a lid bottom edge, wherein a ring-shaped ridge is provided at the middle of the bottom end of the lid bottom edge. The ridge is located in the groove and cooperates with the groove. The ridge and the groove are concentrically arranged. The groove on the pot body and the ridge on the pot cover are arranged in a coordinated manner. When the pot cover is buckled onto the pot body, the ridge is located in the groove. There is a gap between the ridge and the groove. Since the pot edge and the lower edge of the lid cannot be processed to be completely flat, there is also a gap between the pot edge and the lower edge of the lid. A tortuous flow channel is formed between the pot edge, the groove, the lower edge of the lid and the ridge. The steam first passes through the flow channel A between the pot edge and the bottom edge of the lid, then enters the flow channel B between the side of the ridge and the side of the groove, then enters the flow channel C between the bottom of the ridge and the bottom of the groove, then enters the flow channel D between the side of the ridge and the side of the groove, and finally passes through the flow channel E between the pot edge and the bottom edge of the lid. The widths of the flow channels B and D are greater than the widths of the flow channels A, C, and E. When the steam is in channel A, due to its narrow and straight shape, its pressure and temperature decrease, while its velocity increases, meaning that part of the static pressure energy is converted into kinetic energy. When the steam enters channel B, the cross-sectional area of ​​the channel suddenly expands, causing the airflow to form a very strong vortex, and the velocity almost completely disappears. The kinetic energy is converted into thermal energy, causing the steam to rise to its original temperature, while the pressure in the cavity remains after the gap. The steam, with its pressure reduced, enters the narrow and straight channel C, where the pressure drops further, thus achieving the purpose of sealing. The steam then enters channel D, where the cross-sectional area increases, and then enters channel E, where the cross-sectional area decreases. The pot cover is also provided with a micro-pressure valve, which can automatically release excess steam when the pressure in the pot exceeds the set value to prevent safety accidents caused by excessive pressure.

2. The cast iron inner pot of an electric rice cooker according to claim 1, characterized in that: The edge of the pot rim is vertically extended upwards and provided with a retaining ring; the retaining ring is mainly used to limit the horizontal position of the pot cover when the pot cover is buckled on the pot body and the pot cover moves horizontally.

3. The cast iron inner pot of an electric rice cooker according to claim 1, characterized in that: The width of the groove is 4 mm, and the width of the ridge is 2 mm.

4. The cast iron inner pot of an electric rice cooker according to claim 1, characterized in that: The height of the ridge is smaller than the depth of the groove.

5. The cast iron inner pot of an electric rice cooker according to claim 1, characterized in that: The middle part of the pot edge is sunken and provided with multiple circles of concentrically arranged annular grooves, and the bottom of the lower edge of the cover is correspondingly provided with multiple circles of ridges adapted to the grooves.

6. The cast iron inner pot of an electric rice cooker according to claim 1, characterized in that: The micro-pressure valve includes a pressure ball. A connecting column is integrally formed at the center of the top of the pot cover. A first pressure relief channel is vertically opened at the center of the connecting column. The pressure ball is arranged in the pressure relief channel.

7. The cast iron inner pot of an electric rice cooker according to claim 6, characterized in that: The outer wall of the connecting column is integrally formed with an external thread, a second pressure relief channel is vertically provided in the handle, a connecting nut is embedded in the lower end of the second pressure relief channel, the connecting nut is engaged with the external thread, and the handle is threadedly connected to the top of the connecting column through the connecting nut.

8. The cast iron inner pot of an electric rice cooker according to claim 7, characterized in that: A sealing plate is also provided on the top of the second pressure relief channel, and the function of the sealing plate is to prevent the pressure ball from escaping from the top of the second pressure relief channel.

9. The cast iron inner pot of an electric rice cooker according to claim 8, characterized in that: The sealing plate is provided with a through hole for discharging steam.

10. An electric rice cooker, characterized in that: The invention comprises the cast iron inner pot of an electric rice cooker according to any one of claims 1 to 9, and also comprises an electric rice cooker shell, wherein the bottom of the electric rice cooker shell is provided with supporting feet, the top of the electric rice cooker shell is provided with a pot body placement groove for placing the pot body, and the top of the electric rice cooker shell is symmetrically provided with two pot-taking notches, which are used for a user to take the pot body out of the electric rice cooker shell.

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