WO2017096747A1

WO2017096747A1 - Miniature electric rice cooker having heating body of improved structure

Info

Publication number: WO2017096747A1
Application number: PCT/CN2016/079950
Authority: WO
Inventors: 何志雄
Original assignee: 何志雄
Priority date: 2015-12-10
Filing date: 2016-04-22
Publication date: 2017-06-15
Also published as: CN105342364A; CN105342364B

Abstract

A miniature electric rice cooker having a heating body of an improved structure, comprising an outer cooker body (1), an intermediate layer (2), a cooking bowl (3), and a PTC heater (4), wherein the intermediate layer (2) is provided with an intermediate layer cavity (21) and the bottom thereof is provided with an opening (22); the cooking bowl (3) is provided on the intermediate layer (2) and extends into the intermediate layer cavity (21). The PTC heater (4) comprises a heat conducting shell (41) and a PTC heating element (42) which is fixed on the heat conducting shell (41); the heat conducting shell (41) is fixed in the intermediate layer cavity (21); the bottom wall of the cooking bowl (3) is abutted against or close to the upper surface of the heat conducting shell (41). By using a PTC heater to directly heat a cooking bowl, the cooking bowl can be heated more quickly and uniformly, thereby facilitating improving the heating efficiency. Moreover, this invention is beneficial to popularization and application while simplifying the structure, facilitating installation, and reducing costs.

Description

Micro-electric rice cooker with improved structure

Technical field

The invention relates to a miniature rice cooker, in particular to a miniature rice cooker with improved structure of a heating body.

Background technique

The existing miniature rice cooker comprises an outer pot, a liner and an electric heating device, the electric heating device is a PTC heating element, and the PTC heating element is mounted on the bottom wall of the inner liner through a fixing component, that is, the inner tank and the PTC heating body are fixedly connected. During operation, the PTC heating element is energized and heated to transfer heat to the bottom wall of the liner.

However, the above-mentioned conventional miniature rice cooker has the following disadvantages: (1) The PTC heating element is fixed to the bottom wall of the inner liner, the inner liner cannot be taken out, and the inner liner is heated only by the bottom PTC heating element (heat transfer), and the heat is also It is easy to dissipate to the surrounding area. Therefore, the traditional PTC-heated rice cooker is unevenly heated and has low thermal efficiency. (2) Since the heat around the inner liner is easily lost, the heating is concentrated on the bottom of the inner liner, and the heating is uneven, which seriously affects the The taste of the cooked food; even because the bottom wall of the inner tank is connected with a snap-type thermostat, and the bottom wall of the inner tank is too high, the thermostat is protected from premature power failure, resulting in the upper part of the inner liner away from the bottom wall of the inner liner. The food is not cooked, causing the food to cause waste; (3), the fixed connection between the liner and the PTC heating element not only causes installation trouble, but also cannot be taken out separately because of the inner liner, causing certain inconvenience to daily use; 4) The inner tank and the PTC heating element are connected by a fixing component, and the fixing component comprises a bolt welded to the bottom of the inner tank and a fixing nut for matching with the bolt, etc., since the bolt is welded to the bottom wall of the inner casing, Process , More difficult, often due to welding is not strong and is likely to cause the bolts loose.

To this end, the applicant proposes a new type of miniature rice cooker to overcome the above-mentioned deficiencies. It is provided with an intermediate heating layer inside the outer pot, an electric heating device composed of a heat conducting tray and an electric heating body, and the inner tube is placed. Above the heat-conducting tray of the inner cavity, the heat is concentrated in the inner cavity to prevent the heat from being easily lost, and the inner heat of the inner liner is evenly prevented, the local food of the inner liner is prevented from being cooked, and the heat efficiency is obviously improved; In view of the detachable contact between the electric heating device and the inner tank, the two can be prevented from being taken out due to the fixed connection, and the tray area is widened, and the heat is raised along the sides of the tray to make the inner The food around the gallbladder is evenly heated, and the cooking outlet is better; and the entire electric heating device or the middle layer is supported by the simple support body and the cushion member, and the cushion member simultaneously has the effects of heat insulation and shock absorption, so The structure of the whole miniature rice cooker is simple and reasonable. Moreover, the cushion member is a heat-insulating and elastic cushion member, which has more obvious heat insulation and shock-absorbing effects; if the cushion member is a plurality of gaskets stacked together, the shock absorber effect can be further improved and Insulation effect. Finally, the electric heating element may include a PTC heating element and a pressing piece, so that the heat is directly transmitted to the heat conducting tray, and then the heat transfer tray having a large heat conduction area transfers the heat to the inner tank quickly and comprehensively, and the heat is concentrated in the middle layer. The inner cavity prevents heat from being easily lost, and the inner tank is heated more evenly in the inner cavity; while the heat transfer tray, tableting and The PTC heating element constitutes an integral connection, that is, constitutes the electric heating device; this integral connection not only facilitates the rapid and comprehensive transfer of heat, but also makes the structure more compact, and is particularly suitable for such a small-sized miniature rice cooker.

However, this miniature rice cooker still has some imperfections: (1) The electric heating element can not directly transfer heat to the inner tank, but transmits heat to the inner tank through the heat conduction tray, and its thermal efficiency is not high; (2) The addition of a heat-conducting tray inevitably results in a complicated structure and an increase in cost, which limits the promotion and use of the product to a certain extent.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art described above, and to provide a miniature rice cooker with improved structure of a heating body which is simple in structure, convenient in installation, and improved in thermal efficiency while effectively reducing production cost.

The object of the invention is achieved in this way:

The electric rice cooker with improved structure of the heating body comprises an outer pot, a middle inner tank and a PTC heating element, the middle layer has a middle cavity, and the bottom is provided with an opening, and the inner tank is disposed in the middle layer and extends into the middle layer cavity, wherein: The PTC heating element comprises a heat-conducting housing and a PTC heating element, the PTC heating element is fixed on the heat-conducting housing, the heat-conducting housing is fixed in the middle-layer cavity, and the bottom wall of the inner liner is opposite or close to the upper surface of the heat-conducting housing; By further simplifying the heating device, the PTC heating element directly heats the inner liner, thereby eliminating the deficiencies of the intermediate thermal conductive tray, so that the inner heating of the inner tank is more express and more uniform, which is beneficial to improving the thermal efficiency, and the structure is simplified and the installation is convenient. While reducing costs, it is conducive to the promotion and use of products.

As a further solution, the heat conducting housing comprises a convex curved upper layer and a lower clamping cavity, the PTC heating element is fixed in the lower layer of the clamping cavity, and the surface of the convex curved upper layer is the upper surface of the heat conducting housing; PTC heating The piece is a PTC heating tube, which is fixed to the lower layer of the clamping cavity by pressurization, and the generated heat is directly transmitted or thermally radiated to the upper inner tank through the heat conducting housing.

In a further aspect, the upper surface of the heat-conducting casing is an uneven surface, and the concave-convex surface design significantly increases the area of the upper surface of the heat-conducting casing, that is, increases the heat-generating area of the upper surface.

As a more perfect solution, the thickness of the upper layer of the heat-conducting casing is between 2 mm and 10 mm; in view of the elimination of the heat-conducting tray, the thickness of the heat-conducting casing needs to be further improved, from 1 mm to 2-10 mm. To meet the requirements of various heating applications.

As a further solution, the lower layer of the clamping cavity extends downwardly from the opening of the bottom of the middle layer to facilitate electrical connection of the PTC heating element in the clamping cavity.

The heat conducting shell is a heat conducting aluminum shell, the aluminum shell has a good heat conducting effect, and the processing is easy, and the whole heat conducting aluminum shell can be formed by stretching once.

As a more perfect solution, the two ends of the convex curved upper layer of the heat conducting housing are respectively connected to the inner walls of both sides of the middle layer, For example, the two ends of the convex curved upper layer are connected and fixed to the inner walls on both sides of the middle layer through the connecting member.

Of course, the convex curved upper layer of the heat conducting housing can also be connected to the bottom of the middle layer through the connecting member, the connection is easier, and the connection of the heat conducting housing is stronger.

The connecting member is a screw and a nut assembly, and two through holes are respectively disposed on two sides of the opening of the bottom portion of the middle layer, and two ends of the two screws are respectively connected to the two sides of the convex curved upper layer of the heat conducting shell, and the other ends of the two screws pass through the middle layer The corresponding through hole at the bottom is connected to the corresponding nut.

The convex curved upper bottom wall of the heat conducting housing is provided with a mounting seat, and the mounting seat is provided with a temperature sensor, and the mounting seat is fixed on the convex curved upper bottom wall by a screw and nut assembly and extends out of the opening of the middle bottom.

The beneficial effects of the present invention are as follows:

(1) This miniature rice cooker, by further simplifying the heating device, directly heats the inner liner by using the PTC heating element, thereby eliminating the deficiencies of the intermediate thermal conductive tray, so that the inner heating of the inner tank is more express and more uniform, which is beneficial to improve the thermal efficiency, and It simplifies the structure, facilitates installation, reduces costs, and is conducive to the promotion and use of products.

(2) Further, the upper surface of the heat-conducting casing is an uneven surface, which significantly increases the area of the upper surface of the heat-conducting casing, that is, increases the heat-generating area of the upper surface; and the thickness of the upper layer of the heat-conducting casing is between 2 mm and 10 mm; The heat-conducting tray is omitted, so the thickness of the heat-conducting housing needs to be further increased from 1 mm to 2-10 mm to meet various heating requirements.

DRAWINGS

Fig. 1 is a schematic view of a miniature rice cooker with an improved structure of the heating body of the present invention.

Fig. 2 is a perspective view showing the connection relationship between the middle layer of Fig. 1 and the inner liner and the PTC heating element;

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2;

Fig. 4 is a perspective enlarged view of the PTC heating element of the present invention.

Fig. 5 is an enlarged perspective view showing the PTC heating element of Fig. 4 in another direction.

Fig. 6 is a perspective enlarged view of the PTC heating element of Fig. 4 in another direction.

detailed description

The invention is further described below in conjunction with the drawings and embodiments.

As shown in FIG. 1 to FIG. 6, a miniature rice cooker with a heating body improved structure includes an outer pan 1, a middle layer 2, a inner liner 3 and a PTC heating element 4, the middle layer 2 has a middle cavity 21, and the bottom is provided with an opening 22, The inner lining 2 is disposed in the middle layer 2 and extends into the middle cavity 21, wherein the PTC heating element 4 includes a heat conducting housing 41 and a PTC heating element 42. The heat conducting housing 41 is a heat conducting aluminum shell, and the PTC heating element 42 It is fixed on the heat conducting housing 41, and the heat conducting housing 41 is fixed in the middle cavity 21, and the bottom wall of the inner tank 3 is opposite to or close to the upper surface 5 of the heat conducting housing 41.

As shown in the figure, the heat conducting housing 41 comprises a convex curved upper layer 6 and a lower clamping cavity layer 7, and the PTC heating element 42 is fixed in the lower layer 7 of the clamping cavity, and the surface of the convex curved upper layer 6 is the heat conducting housing. The upper surface 5 of the thermally conductive housing is preferably an uneven surface, and the upper layer 6 of the thermally conductive housing has a thickness between 2 mm and 10 mm.

As a more specific solution, the lower portion 7 of the ferrule extends downwardly from the opening 22 at the bottom of the intermediate layer 2.

The convex curved upper layer 6 of the heat conducting housing 41 is connected to the bottom of the middle layer 2 through the connecting member 8, that is, the connecting member 8 may be a screw nut assembly for guiding the convex curved upper layer 6 and the middle layer on the heat conducting housing 41. 2 The bottom connection is fixed; as shown in FIG. 4, a connecting member 8 is arranged between the bottom wall of the convex curved upper layer 6 and the bottom of the middle layer, and the connecting member 8 is a screw nut assembly. Corresponding springs 11 are respectively disposed at the positions of the screw and nut assembly on both sides, and the screw and nut assembly passes through the spring 11, and the two ends of the spring 11 respectively press the bottom wall of the convex upper layer 6 and the bottom of the middle layer 2 to adjust the screw nut assembly. , to make it a certain elasticity, which is conducive to adjustment and tightening.

Of course, according to the design requirements, the two ends of the convex curved upper layer 6 of the heat-conducting housing 41 are respectively connected to the inner walls of the two sides of the middle layer 2, such as: connected by a connecting member, or directly welded.

The connecting member 8 is a screw and a nut assembly, and two sides of the opening 22 at the bottom of the middle layer 2 are respectively provided with through holes, and two ends of the two screws are respectively connected to the two sides of the convex curved upper layer 6 of the heat conducting housing 41, two screws The other end passes through the corresponding through hole at the bottom of the middle layer 2 and is connected to the corresponding nut.

The bottom wall of the convex curved upper layer 6 of the heat conducting housing is provided with a mounting seat 9, and the mounting seat 9 is provided with a temperature sensor. The mounting seat 9 is fixed on the bottom wall of the convex curved upper layer 6 by screws and nut assemblies and extends out of the middle layer 2 The opening 22 at the bottom; as shown in FIG. 4, the mounting seat 9 includes a horizontal piece 91 and a sensor seat 92. The sensor seat 92 is disposed on the horizontal piece 91. The two ends of the horizontal piece 91 are provided with mounting holes so that the screw and nut assembly will be horizontal. The sheet 91 is fixed on the bottom wall of the convex curved upper layer 6; wherein, as shown in the figure, the bottom wall of the convex curved upper layer 6 is provided with two left and right shapes and a symmetrical clamping cavity lower layer 7, but two clamping members A gap 10 is present between the sub-cavities 7, and the mount 9 is disposed in this gap 10.

The present invention is not intended to limit the invention, and any modifications, equivalent substitutions or improvements made within the spirit and scope of the invention are included in the scope of the present invention. Inside.

Claims

The electric rice cooker with improved structure of the heating body comprises an outer pot (1), a middle layer (2), a inner liner (3) and a PTC heating element (4), the middle layer (2) has an intermediate cavity (21), and the bottom is provided with an opening ( 22) The inner liner (3) is disposed in the middle layer (2) and extends into the middle cavity (21), wherein the PTC heating element (4) comprises a heat conducting housing (41) and a PTC heating element (42). The PTC heating element (42) is fixed on the heat conducting housing (41), the heat conducting housing (41) is fixed in the middle cavity (21), and the bottom wall of the inner liner (3) and the upper surface of the heat conducting housing (41) (5) Matching or similar.
The micro rice cooker according to claim 1, wherein the heat conducting casing (41) comprises a convex curved upper layer (6) and a lower clamping cavity (7), and the PTC heating element (42) is fixed. In the lower layer (7) of the clamping cavity, the surface of the convex curved upper layer (6) is the upper surface (5) of the thermally conductive housing.
A miniature rice cooker according to claim 2, wherein the upper surface (5) of the heat-conducting casing is a concave-convex surface.
A miniature rice cooker according to claim 2, wherein the upper layer (6) of the thermally conductive casing has a thickness of between 2 mm and 10 mm.
A miniature rice cooker according to claim 2, wherein the lower portion (7) of the ferrule extends downwardly from the opening (22) at the bottom of the intermediate layer (2).
A miniature rice cooker according to claim 1, wherein the heat conducting casing (41) is a heat conducting aluminum shell.
The miniature rice cooker according to claim 1, wherein both ends of the convex curved upper layer (6) of the heat conducting casing (41) are respectively connected to inner walls of both sides of the middle layer (2).
A miniature rice cooker according to claim 1, wherein the convexly curved upper layer (6) of the thermally conductive casing (41) is connected to the bottom of the intermediate layer (2) via a connecting member (8).
A miniature rice cooker according to claim 8, wherein the connecting member (8) is a screw and nut assembly, and the opening (22) at the bottom of the middle layer (2) is respectively provided with a through hole for conducting heat. Two ends of the two screws are respectively connected to the two sides of the convex upper layer (6) of the casing (41), and the other ends of the two screws pass through the corresponding through holes at the bottom of the middle layer (2) and are connected with the corresponding nuts.
The micro rice cooker according to claim 2, wherein the bottom edge of the convex curved upper layer (6) of the heat conducting housing is provided with a mounting seat (9), and the mounting seat (9) is provided with a temperature The sensor, mount (9) is secured to the bottom wall of the convexly curved upper layer (6) by screws and nut assemblies and extends out of the opening (22) at the bottom of the intermediate layer (2).