Electric stewpot

Abstract

The utility model relates to an electric stewpot which comprises a base, a stew cup, an upper cover and a cushion frame, a heating cavity is formed in the base, a heating plate is arranged on the bottom wall of the heating cavity and comprises a plate body and a heating pipe arranged below the plate body, the cushion frame is arranged in the heating cavity, the stew cup is arranged on the cushion frame, and the upper cover covers the base to cover the heating cavity. The cushion frame comprises a cushion plate and supporting legs arranged on the lower side of the cushion plate, the cushion plate comprises a bubble breaking area and a non-bubble breaking area, a plurality of bubble breaking channels are formed in the position, close to the outer edge of the cushion plate, of the bubble breaking area, the lower surface of the cushion plate is at least provided with a first flow guide face in the bubble breaking area, and the first flow guide face is arranged in a rising mode from the center of the cushion plate to the outer edge. And at least part of orthographic projections of the air outlet holes on the base plate are located in the non-broken bubble area. Noise emitted by the noise source can be reduced by arranging the broken bubble channel, at least part of the orthographic projection of the air outlet hole on the base plate is located in the non-broken bubble area, the propagation path of the noise can be prolonged, the dissipation amount of the noise is reduced, and therefore the noise is reduced.

Description

Technical Field

[0001] This application relates to the technical field of cooking appliances, and particularly to an electric slow cooker. Background Art

[0002] When an electric slow cooker for stewing with water separation works, a large number of small bubbles are generated on the surface of the heating plate. During the rising process of the bubbles, they are blocked by the pad rack and the stewing pot, and the small bubbles aggregate to form large bubbles and break after floating out of the water surface, generating a relatively large bubble breaking sound, and the noise escapes outward through the air outlet holes on the upper cover. Since the stewing time with water separation is usually relatively long, the electric slow cooker continuously emits noise during the working process, seriously affecting the user experience. Therefore, how to reduce the noise of the electric slow cooker has become a technical problem that needs to be solved urgently. Utility Model Content

[0003] Based on this, it is necessary to provide an electric slow cooker that can reduce noise.

[0004] This application provides an electric slow cooker, including: a base, a stewing pot, an upper cover, and a pad rack. A heating cavity is provided inside the base, a heating plate is provided on the bottom wall of the heating cavity, the heating plate includes a plate body and a heating tube provided below the plate body. The pad rack is provided inside the heating cavity, the stewing pot is placed on the pad rack, the upper cover covers the base to cover the heating cavity. The pad rack includes a backing plate and supporting feet provided on the lower side of the backing plate. The backing plate includes a bubble-breaking area and a non-bubble-breaking area. The bubble-breaking area is provided with a plurality of bubble-breaking channels near the outer edge of the backing plate. At least on the bubble-breaking area of the lower surface of the backing plate, there is a first guiding surface, and the first guiding surface is arranged in an upward shape from the center of the backing plate to the outer edge. The upper cover is provided with air outlet holes, and the orthographic projection of the air outlet holes on the backing plate is at least partially located in the non-bubble-breaking area.

[0005] For the electric slow cooker provided by this application, by setting the backing plate to include a bubble-breaking area and a non-bubble-breaking area, and arranging a first guiding surface in the bubble-breaking area, the bubbles below the backing plate are guided by the first guiding surface to flow towards the outer edge of the backing plate, and after passing through the bubble-breaking channels, they break and escape. Since noise is generated when the bubbles break, and the larger the bubbles, the greater the noise. By arranging the bubble-breaking channels in this application, large bubbles can be broken into small bubbles, thereby reducing the noise emitted by the noise source. At the same time, since the orthographic projection of the air outlet holes provided on the upper cover on the backing plate is at least partially located in the non-bubble-breaking area, that is, the air outlet holes are not directly above the bubble-breaking area, the propagation path of the noise is extended, and the escape amount of the noise is reduced, thereby further reducing the noise.

[0006] In one embodiment, at least part of the orthographic projection of the hot end of the heating tube on the horizontal plane coincides with the bubble-breaking area; or at least part of the orthographic projection of the hot end of the heating tube on the horizontal plane coincides with the bubble-breaking channels.

[0007] Since the heat generated at the hot end of the heating tube is relatively large, a large number of bubbles will be generated in the area of the heating cavity corresponding to the hot end of the heating tube. In this embodiment, such a setting makes a large number of bubbles generated by the heating of the water body by the heating tube located in the bubble-breaking area. Therefore, a large number of bubbles are broken into smaller bubbles through the bubble-breaking channel and then escape upward, generating less noise. At the same time, since the orthographic projection of the air outlet provided on the upper cover on the backing plate is at least partially located in the non-bubble-breaking area, the noise is further reduced.

[0008] In one embodiment, a convection hole and a first baffle are provided in the central area of the backing plate. The first baffle surrounds the convection hole. The first baffle protrudes downward relative to the lower surface of the backing plate, and the bottom end of the first baffle is higher than the bottom end of the support leg. The orthographic projection of the heating tube on the horizontal plane is located outside the orthographic projection of the first baffle on the horizontal plane.

[0009] When the electric slow cooker is working, a hot area with a relatively high water temperature is formed near the edge of the backing plate, while a cold area with a relatively low temperature is formed in the area between the lower part of the stewing pot and the upper part of the backing plate. In the hot area, due to the intense activity of water molecules and relatively small density, the water will flow upward. The water in the cold area will flow downward due to its relatively large density. By providing the convection hole, the water in the cold area can flow to the lower part of the backing plate through the convection hole and flow towards the four edges of the backing plate. Thus, the cold area and the hot area are interconnected to form a circulating heat convection, enabling the water body in the heating cavity to be heated faster and improving the overall thermal efficiency of the electric slow cooker. By providing the first baffle and the bottom end of the first baffle being higher than the bottom end of the support leg, when the pad rack is placed in the heating cavity, the first baffle does not contact the disk body. Therefore, the water flow flowing down from the convection hole can flow over the first baffle from below and flow towards the outer edge of the backing plate, ensuring the heat convection cycle in the heating cavity. At the same time, bubbles are formed outside the first baffle, and the first baffle can intercept the bubbles to prevent the bubbles below the backing plate from directly escaping from the convection hole.

[0010] In one embodiment, a stop strip for dividing the backing plate into the bubble-breaking area and the non-bubble-breaking area is provided on the lower surface of the backing plate. The stop strip includes two first enclosures, and each first enclosure extends from the first baffle towards the outer edge of the backing plate.

[0011] In this way, the stop strip can play a role in blocking, preventing bubbles from flowing from the bubble-breaking area to the non-bubble-breaking area, making the bubbles concentrated in the bubble-breaking area. Thus, the bubble-breaking channel in the bubble-breaking area can be used to perform bubble-breaking treatment on the bubbles. The stop strip includes two first enclosures, and the two first enclosures and the first baffle cooperate to separate the bubble-breaking area and the non-bubble-breaking area, and the structure is very simple.

[0012] In one embodiment, a retaining strip that divides the cushion plate into the foam-breaking area and the non-foam-breaking area is provided on the lower surface of the cushion plate. The retaining strip includes two second enclosures and one third enclosure. The third enclosure is an arc-shaped rib. The two second enclosures are respectively connected to both ends of the third enclosure and extend towards the outer edge of the cushion plate. The convection holes are located in the foam-breaking area.

[0013] In this way, it is ensured that the positive projection of the hot end of the heating tube on the horizontal plane falls more into the positive projection of the foam-breaking area on the horizontal plane. Thus, more bubbles generated by the water body during heating enter the foam-breaking area, and are guided by the first guiding surface to the foam-breaking channel and escape through the first foam-breaking channel. Therefore, the cushion rack has a better noise reduction effect.

[0014] In one embodiment, one or more third retaining ribs are provided in the foam-breaking area. One end of the third retaining rib is connected to the first retaining rib, and the other end extends towards the outer edge of the cushion plate.

[0015] In this way, the third retaining rib can divide the foam-breaking area into multiple foam-breaking sub-areas, thereby reducing the probability of bubbles aggregating on the first guiding surface of the foam-breaking area, and further improving the utilization rate of the foam-breaking channel.

[0016] In one embodiment, a second retaining rib is provided on the outer edge of the cushion plate, and the second retaining rib extends upward or downward.

[0017] When the second retaining rib extends upward, it is beneficial to guide the bubbles and water flow to flow upward, thus facilitating the improvement of heat convection circulation. When the second retaining rib extends downward, it can prevent the bubbles from directly escaping from the edge of the cushion plate without passing through the foam-breaking channel, thereby further reducing the noise.

[0018] In one embodiment, the second retaining rib extends downward, and the foam-breaking channel is provided on the second retaining rib and horizontally penetrates the inner and outer side surfaces of the second retaining rib.

[0019] In this way, when the bubbles are guided to the vicinity of the edge of the cushion plate, they can escape outward through the foam-breaking channel on the second retaining rib. The foam-breaking channel can also break the bubbles. The stew pot will not block the bubbles escaping from the foam-breaking channel, avoiding the noise generated by the bubbles hitting the stew pot.

[0020] In one embodiment, the foam-breaking channel is provided on the cushion plate and vertically penetrates the upper and lower side surfaces of the cushion plate.

[0021] In this way, the bubbles generated by heating the water body first enter the foam-breaking area, then move along the first guiding surface to the edge of the cushion plate, and then escape upward through the foam-breaking channel.

[0022] In one embodiment, the bubble-crushing channel includes a gradually converging section, an equal-diameter section, and a gradually diverging section that are connected in sequence. Among them, the gradually converging section is disposed close to the first guiding surface. In the direction from one end of the bubble-crushing channel close to the first guiding surface to the other end, the gradually converging section is in a converging shape, the inner diameter of the equal-diameter section remains unchanged, and the gradually diverging section is in a diverging shape.

[0023] In this way, after the bubbles are guided to the vicinity of the outer edge of the backing plate, they sequentially pass through the gradually converging section, the equal-diameter section, and the gradually diverging section, and finally escape from the gradually diverging section. Among them, the gradually converging section can accelerate the heat convection of the fluid, form a negative pressure, thereby attracting the bubbles to flow into the bubble-crushing channel. After passing through the gradually converging section, the bubbles are compressed to the same diameter as the equal-diameter section, and then the bubbles enter the gradually diverging section. The bubbles are sheared by turbulence in the gradually diverging section and are tightly broken into small bubbles and leave the bubble-crushing channel.

[0024] In one embodiment, a first limiting rib is provided in the heating cavity. The first limiting rib is used to limit the backing plate holder, so that the center of the backing plate is aligned with the center of the heating disk.

[0025] In this way, it can ensure that there is enough clearance reserved between the edge of the backing plate and the side wall of the heating cavity, avoid affecting the hot water flow of the water body in the heating cavity, and avoid bubbles from escaping from the convection holes.

[0026] In one embodiment, a second limiting rib is provided in the heating cavity, and a limiting groove is provided on the support leg. The second limiting rib cooperates with the limiting groove to limit the installation position of the backing plate holder in the heating cavity.

[0027] In this way, it is ensured that the position of the backing plate holder is accurately installed, so that the bubble-crushing area is located above the hot end of the heating tube, so as to ensure that the bubbles can enter the bubble-crushing area when rising, and then escape upward after being broken through the bubble-crushing channel.

[0028] In one embodiment, an anti-misalignment structure is provided at the connection between the base and the upper cover. The anti-misalignment structure includes a positioning rib and a positioning groove. One of the positioning rib and the positioning groove is provided on the base, and the other is provided on the upper cover. The positioning rib cooperates with the positioning groove to limit the covering position of the upper cover on the base.

[0029] In this way, when the upper cover is closed, it can be ensured that the orthographic projection of the air outlet hole on the backing plate is at least partially located in the non-bubble-crushing area, so as to ensure that the noise propagation path is longer, thereby ensuring the noise reduction effect of the upper cover. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Exploded view of an electric slow cooker according to an embodiment of the present application;

[0032] Figure 2 Cross-sectional view of an electric slow cooker according to an embodiment of the present application;

[0033] Figure 3 Structural schematic diagram of a heating plate according to an embodiment of the present application;

[0034] Figure 4 Stereogram of the back side view of a pad rack according to an embodiment of the present application;

[0035] Figure 5 Stereogram of the front side view of a pad rack according to an embodiment of the present application;

[0036] Figure 6 Cross-sectional view of a pad rack according to an embodiment of the present application;

[0037] Figure 7 For Figure 6 Partial enlarged view at position A in

[0038] Figure 8 Stereogram of a base according to an embodiment of the present application;

[0039] Figure 9 For Figure 8 Partial enlarged view at position B in

[0040] Figure 10 For Figure 8 Partial enlarged view at position C in

[0041] Figure 11 Semi-sectional stereogram of an electric slow cooker without a stewing pot according to an embodiment of the present application;

[0042] Figure 12 For Figure 11 Partial enlarged view at position D in

[0043] Figure 13 Stereogram of the back side of a pad rack according to another embodiment of the present application.

[0044] Reference numerals: 100, base; 110, heating chamber; 1011, first limiting rib; 1012, second limiting rib; 120, hot zone; 130, cold zone; 200, stewing pot; 300, upper cover; 301, air vent; 400, heating plate; 410, plate body; 420, heating tube; 421, cold end; 422, hot end; 500, pad rack; 10, backing plate; 11, first guiding surface; 12, second guiding surface; 13, convection hole; 15, convex post; 20, supporting leg; 23, limiting groove; 30, first retaining rib; 40, second retaining rib; 50, broken bubble channel; 53, converging section; 54, equal-diameter section; 55, diverging section; 60, supporting rib; 63, first reinforcing rib; 64, second reinforcing rib; 70, retaining strip; 71, broken bubble area; 711, third retaining rib; 72, non-broken bubble area; 73, first enclosure; 74, second enclosure; 75, third enclosure; 80, anti-fooling structure; 81, positioning rib; 82, positioning groove. Detailed implementation manners

[0045] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0046] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0049] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0050] Please refer to Figures 1 to 4 , this application provides an electric slow cooker, including: a base 100, a stewing pot 200, a top cover 300 and a pad rack 500. A heating cavity 110 is provided in the base 100, and a heating plate 400 is provided on the bottom wall of the heating cavity 110. The heating plate 400 includes a plate body 410 and a heating tube 420 provided below the plate body 410. The pad rack 500 is provided in the heating cavity 110, the stewing pot 200 is placed on the pad rack 500, and the top cover 300 covers the base 100 to cover the heating cavity 110. The pad rack 500 includes a pad plate 10 and support feet 20 provided on the lower side of the pad plate 10. The pad plate 10 includes a broken bubble area 71 and a non-broken bubble area 72. A plurality of broken bubble channels 50 are provided in the broken bubble area 71 near the outer edge of the pad plate 10. At least in the broken bubble area 71, a first flow guiding surface 11 is provided on the lower surface of the pad plate 10, and the first flow guiding surface 11 is arranged in an upward shape from the center of the pad plate 10 to the outer edge. The top cover 300 is provided with an air outlet hole 301, and the orthographic projection of the air outlet hole 301 on the pad plate 10 is at least partially located in the non-broken bubble area 72. For the electric slow cooker provided in this application, by arranging the pad plate 10 to include a broken bubble area 71 and a non-broken bubble area 72, and providing the first flow guiding surface 11 in the broken bubble area 71, the air bubbles below the pad plate 10 are guided by the first flow guiding surface 11 to flow towards the outer edge of the pad plate 10 and escape after being broken through the broken bubble channels 50. Since noise is generated when air bubbles burst, and the larger the air bubbles, the greater the noise, this application can break large air bubbles into small air bubbles by providing the broken bubble channels 50, thereby reducing the noise emitted by the noise source. At the same time, since the orthographic projection of the air outlet hole 301 provided on the top cover 300 on the pad plate 10 is at least partially located in the non-broken bubble area 72, that is, the air outlet hole 301 is not directly above the broken bubble area 71, the propagation path of the noise is extended and the escape amount of the noise is reduced, thereby further reducing the noise.

[0051] Please refer to Figure 2 , where S represents the water level line; P represents the bubble path; Q represents the heat convection path. When the water body in the heating chamber 110 is heated by the heating plate 400, a large number of bubbles will be generated in the water body. The bubbles carry a large amount of heat energy. Under the guiding action of the first guiding surface 11, the bubbles below the backing plate 10 will flow upward along the first guiding surface 11 to the outer edge of the backing plate 10. At the same time, the water flow below the backing plate 10 will flow toward the outer edge of the backing plate 10, so that a hot area 120 with a higher water temperature is formed near the outer edge of the backing plate 10 (i.e., near the side wall of the heating chamber 110), while a cold area 130 with a lower temperature is formed in the area between the lower part of the stew pot 200 and the upper part of the backing plate 10. Thus, the water body in the heating chamber 110 forms two regions with obvious temperature differences. Due to the intense activity of water molecules in the hot area 120 and its relatively small density, it will flow upward, and the water in the cold area 130 will flow downward due to its relatively large density. In one embodiment, please refer to Figure 2 、 Figure 4 and Figure 5 , a convection hole 13 is provided in the central area of the backing plate 10. In this way, the water in the cold area 130 can flow to the lower part of the backing plate 10 through the convection hole 13 and flow toward the outer edge of the backing plate 10. Thus, the cold area 130 and the hot area 120 are interconnected to form a circulating heat convection, so that the water body in the heating chamber 110 can be heated faster, improving the overall thermal efficiency of the electric stew pot.

[0052] Furthermore, please refer to Figure 4 and Figure 6 , the lower surface of the backing plate 10 is provided with a first guiding surface 11, and the first guiding surface 11 is an inclined surface, a conical surface or an arc surface. In this way, under the guiding action of the first guiding surface 11, the water flow and bubbles below the backing plate 10 are easily directed toward the outer edge of the backing plate 10, which is conducive to the formation of a heat convection cycle, and the air flow can escape from the outer edge of the backing plate 10, reducing the aggregation of bubbles on the lower surface of the backing plate 10 and the impact on the lower surface of the backing plate 10.

[0053] Furthermore, please refer to Figure 6 , the vertical section of the first guiding surface 11 is a first oblique line, and the included angle between the first oblique line and the horizontal plane is γ1, and γ1 is 1° to 30°. In this way, the first guiding surface 11 is conducive to guiding the bubbles to the outer edge of the backing plate 10. Specifically, γ1 can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, or any other arbitrary value within the range of 1° to 30°.

[0054] Furthermore, please refer to Figure 2 、Figure 5 and Figure 6 On the upper surface of the backing plate 10, there is a second flow guiding surface 12, and the second flow guiding surface 12 is an inclined surface, a conical surface or an arc surface. In this way, under the guiding action of the second flow guiding surface 12, the water flow above the backing plate 10 easily flows towards the center of the backing plate 10, thereby facilitating the formation of a heat convection cycle.

[0055] Furthermore, please refer to Figure 6 , the vertical section of the second flow guiding surface 12 is a second inclined line, and the included angle between the second inclined line and the horizontal plane is γ2, where γ2 is 1° to 30°. In this way, the second flow guiding surface 12 is conducive to guiding the water flow to the center of the backing plate 10, promoting the water flow in the hot zone 120 to flow towards the cold zone 130, thereby improving the heat exchange efficiency. Specifically, γ2 can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, or any other arbitrary value within the range of 1° to 30°.

[0056] Preferably, the first flow guiding surface 11 and the second flow guiding surface 12 are arranged in parallel. In this way, it is not only conducive to the heat convection cycle, but also the structure of the backing plate 10 is very simple.

[0057] Please refer to Figure 5 , on the upper side of the backing plate 10, there are a plurality of support ribs 60 arranged at intervals. In this way, the gaps between adjacent support ribs 60 can allow the water flow to pass through, so as to ensure that the water flow at the edge of the backing plate 10 can flow towards the center, thereby realizing the heat convection cycle.

[0058] In this embodiment, the plurality of support ribs 60 are circumferentially arranged on the upper surface of the backing plate 10. In this way, the plurality of support ribs 60 can stably support the stew pot 200.

[0059] Furthermore, on the backing plate 10, there are also a first reinforcing rib 63 and a second reinforcing rib 64. The first reinforcing rib 63 connects two adjacent support ribs 60, and one end of the second reinforcing rib 64 is connected to the side of the support rib 60 away from the convection hole 13, and the other end extends towards the outer edge of the backing plate 10. In this way, the structural strength of the support rib 60 is enhanced, making the support rib 60 not easily deformed, so that the pad rack 500 can more stably support the stew pot 200, and the distance between the support ribs 60 is ensured, ensuring the heat convection effect.

[0060] Furthermore, please refer to Figure 2 、 Figure 4 and Figure 6, a first rib 30 is provided in the central region of the backing plate 10. The first rib 30 surrounds the convection holes 13. The first rib 30 protrudes downward relative to the lower surface of the backing plate 10, and the bottom end of the first rib 30 is higher than the bottom end of the support feet 20. The orthographic projection of the heating tube 420 on the horizontal plane is located outside the orthographic projection of the first rib 30 on the horizontal plane. In this way, when the pad rack 500 is placed in the heating cavity 110, the first rib 30 does not contact the disc body 410, so that the water flow flowing down from the convection holes 13 can flow outward from the lower part over the first rib 30 to the outer edge of the backing plate 10, ensuring the heat convection cycle in the heating cavity 110. At the same time, bubbles are formed outside the first rib 30, and the first rib 30 can intercept the bubbles to prevent the bubbles under the backing plate 10 from directly escaping from the convection holes 13.

[0061] Further, please refer to Figure 2 , the height difference between the bottom end of the first rib 30 and the bottom end of the support feet 20 is L1, and L1 is 3 mm to 20 mm. It can be understood that if the height difference between the bottom end of the first rib 30 and the bottom end of the support feet 20 is L1, then when the pad rack 500 is placed in the heating cavity 110, the distance between the bottom end of the first rib 30 and the top surface of the heating disc 400 is also L1. If this distance L1 is too small, the water flow flowing downward from the convection holes 13 is difficult to flow from below the first rib 30 to the side wall of the heating cavity 110, thus affecting the heat convection cycle; if this distance L1 is too large, the pad rack 500 will occupy a large space, resulting in that the height of the stew pot 200 cannot be set too high or the height dimension of the electric stew pot needs to be increased. In this embodiment, L1 is 3 mm to 20 mm, which neither affects the heat convection cycle of the water flow nor has too much impact on the overall dimensions of the stew pot 200 or the electric stew pot. Specifically, L1 can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or any other value within the range of 3 mm to 20 mm.

[0062] Further, please refer to Figure 6 , the height of the first rib 30 protruding from the lower surface of the backing plate 10 is H1, and H1 is 2 mm to 15 mm. In this way, it can be ensured that the first rib 30 can intercept the bubbles on the lower surface of the backing plate 10 to prevent the bubbles from escaping from the convection holes 13 over the first rib 30. Specifically, H1 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, or any other value within the range of 2 mm to 15 mm.

[0063] Further, please refer to Figure 2 、 Figure 4 and Figure 6, a second retaining rib 40 is provided on the outer edge of the backing plate 10, and the second retaining rib 40 extends upward or downward. When the second retaining rib 40 extends upward, it is beneficial to guide the bubbles and water flow upward, thereby facilitating the improvement of the heat convection cycle. When the second retaining rib 40 extends downward, it can prevent the bubbles from escaping directly from the edge of the backing plate 10 without passing through the bubble-breaking channel 50. Since the bubbles escaping directly from the edge of the backing plate 10 are relatively large in volume and the cracking noise is also relatively large, in this embodiment, by setting the second retaining rib 40 to extend downward, the situation where the bubbles escape directly from the edge of the backing plate 10 can be reduced, so that more bubbles pass through the bubble-breaking channel 50 to be broken and then escape upward, thereby further reducing the noise.

[0064] In one embodiment, the second retaining rib 40 extends downward. Further, please refer to Figure 6 , the height H2 of the second retaining rib 40 protruding from the lower surface of the backing plate 10 is 2 mm to 15 mm. In this way, it can be ensured that the second retaining rib 40 can intercept the bubbles on the lower surface of the backing plate 10 and prevent the bubbles from escaping directly from the edge of the backing plate 10 and affecting the bubble-breaking efficiency. Specifically, H2 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, or any other arbitrary value within the range of 2 mm to 15 mm. Since the bubbles will partially aggregate when flowing through the first guiding surface 11, it is preferably H2≥H1 to ensure that the bubbles will not escape from the edge of the backing plate 10, thereby ensuring the bubble-breaking effect of the bubble-breaking channel 50 on the bubbles.

[0065] It can be understood that the heating tube 420 has a cold end 421 and a hot end 422. Further, please refer to Figures 2 to 4 , the positive projection of the hot end 422 of the heating tube 420 on the horizontal plane at least partially coincides with the bubble-breaking area 71, or the positive projection of the hot end 422 of the heating tube 420 on the horizontal plane at least partially coincides with the bubble-breaking channel 50. Since the heat generated by the hot end 422 of the heating tube 420 is relatively large, a large number of bubbles will be generated in the area corresponding to the hot end 422 of the heating tube 420 in the heating cavity 110. In this embodiment, such a setting makes a large number of bubbles generated by the heating of the water body by the heating tube 420 located in the bubble-breaking area 71. Therefore, a large number of bubbles pass through the bubble-breaking channel 50 to be broken into smaller bubbles and then escape upward, generating relatively small noise. At the same time, since the positive projection of the air outlet hole 301 provided on the upper cover 300 on the backing plate 10 is at least partially located in the non-bubble-breaking area 72, the noise is further reduced. In this embodiment, the positive projection of the air outlet hole 301 provided on the upper cover 300 on the backing plate 10 is completely located in the non-bubble-breaking area 72.

[0066] It is worth mentioning that a large number of bubbles will not be generated in the area in the heating chamber 110 corresponding to the cold end 421 of the heating tube 420. Even if a small number of bubbles are generated and these bubbles are not broken through the bubble-breaking channel 50, the noise generated when these bubbles emerge from the water surface is relatively small and can be ignored. Therefore, the cold end 421 of the heating tube 420 can be arranged below the non-bubble-breaking area 72.

[0067] Please refer to Figure 3 , in one embodiment, the heating tube 420 is in a C shape. The structure of this heating tube 420 is very simple and the cost is relatively low. In this embodiment, the convection holes 13 are circular holes, and the convection holes 13 and the heating tube 420 are concentrically arranged. In this way, it can be avoided that bubbles escape from the convection holes 13 during heating. Further, the inner diameter D1 of the heating tube 420 is greater than the outer diameter D2 of the first rib 30, ensuring that the orthographic projection of the heating tube 420 on the horizontal plane is located outside the orthographic projection of the first rib 30 on the horizontal plane.

[0068] Please refer to Figure 4 and Figure 13 , further, a retaining strip 70 that divides the bottom surface of the backing plate 10 into a bubble-breaking area 71 and a non-bubble-breaking area 72 is provided on the lower surface of the backing plate 10. In this way, the retaining strip 70 can play a role in blocking, preventing bubbles from flowing from the bubble-breaking area 71 to the non-bubble-breaking area 72, making the bubbles concentrated in the bubble-breaking area 71, so that the bubble-breaking channel 50 in the bubble-breaking area 71 can be used to break the bubbles.

[0069] Please refer to Figure 4 , in one embodiment, the retaining strip 70 includes two first enclosures 73. Each first enclosure 73 extends from the first rib 30 towards the outer edge of the backing plate 10. In this way, the two first enclosures 73 and the first rib 30 can cooperate to separate the bubble-breaking area 71 and the non-bubble-breaking area 72, and the structure is very simple. In this embodiment, one end of the first enclosure 73 is connected to the first rib 30, and the other end is connected to the second rib 40.

[0070] Further, the included angle θ between the two first enclosures 73 on the side facing the bubble-breaking area 71 is 90° to 270°. In this way, it is ensured that the orthographic projection of the hot end 422 of the heating tube 420 on the horizontal plane falls within the orthographic projection of the bubble-breaking area 71 on the horizontal plane, so that the bubbles generated by the water body are concentrated in the bubble-breaking area 71, ensuring the noise reduction effect. Specifically, θ can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 180°, 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, or any other value within the range of 90° to 270°.

[0071] Please refer to Figure 13, in another embodiment, the baffle 70 includes two second enclosures 74 and one third enclosure 75. The third enclosure 75 is an arc-shaped rib. The two second enclosures 74 are respectively connected to both ends of the third enclosure 75 and extend towards the outer edge of the backing plate 10. The convection holes 13 are located in the bubble-breaking area 71. In this way, it is ensured that the orthographic projection of the hot end 422 of the heating tube 420 on the horizontal plane falls more into the orthographic projection of the bubble-breaking area 71 on the horizontal plane, so that more bubbles generated by the water body during heating enter the bubble-breaking area 71, and are guided by the first guiding surface 11 to the bubble-breaking channel 50 and escape through the first bubble-breaking channel 50, so that the cushion frame 500 has a better noise reduction effect. In this embodiment, the end of the second enclosure 74 far from the third enclosure 75 is connected to the second retaining rib 40.

[0072] It is worth mentioning that the shape of the heating tube 420 can be C-shaped, e-shaped, square or other shapes. Among them, the C-shaped heating tube 420 has obvious hot and cold ends 422. Correspondingly, the area on the disc body 410 corresponding to the hot end 422 of the heating tube 420 has a higher temperature, while the area corresponding to the cold end 421 of the heating tube 420 has a lower temperature, and there is a situation of uneven circumferential heating of the disc body 410. Figure 4 The bubble-breaking area 71 enclosed by the baffle 70 in the illustrated embodiment is applicable to the C-shaped heating tube 420, while Figure 13 the bubble-breaking area 71 enclosed by the baffle 70 in the illustrated embodiment is applicable not only to the C-shaped heating tube 420, but also to the heating tube 420 that can uniformly heat the disc body 410 circumferentially, such as the e-shaped heating tube.

[0073] Preferably, the orthographic projection of the bubble-breaking area 71 on the horizontal plane completely covers the orthographic projection of the hot end 422 of the heating tube 420 on the horizontal plane. In this way, all the bubbles generated by heating the water body enter the bubble-breaking area 71.

[0074] In addition, the setting method of the baffle 70 is not limited to the above two situations, as long as the baffle 70 can separate the bubble-breaking area 71 and the non-bubble-breaking area 72.

[0075] Further, please refer to Figure 4 and Figure 13 , one or more third retaining ribs 711 are provided in the bubble-breaking area 71. One end of the third retaining rib 711 is connected to the first retaining rib 30, and the other end extends towards the outer edge of the backing plate 10. In this way, the third retaining rib 711 can divide the bubble-breaking area 71 into multiple bubble-breaking sub-areas, so as to reduce the probability of bubbles aggregating on the first guiding surface 11 of the bubble-breaking area 71, and at the same time further improve the utilization rate of the bubble-breaking channel 50.

[0076] Further, in one embodiment, as Figure 5 and Figure 6As shown, the bubble-breaking channel 50 is provided on the backing plate 10 and longitudinally penetrates the upper and lower side surfaces of the backing plate 10. In this way, the bubbles generated by heating the water body first enter the bubble-breaking area 71, then move along the first guiding surface 11 to the outer edge of the backing plate 10, and then escape upward through the bubble-breaking channel 50.

[0077] Furthermore, a plurality of convex columns 15 are provided on the upper surface of the backing plate 10, and the bubble-breaking channel 50 penetrates through the convex columns 15. In this way, by providing the convex columns 15, the length of the bubble-breaking channel 50 can be extended, so that the bubbles are broken more thoroughly.

[0078] In one embodiment, as Figure 7 shown, the bubble-breaking channel 50 includes a gradually converging section 53, an equal-diameter section 54, and a gradually expanding section 55 that are connected in sequence. Among them, the gradually converging section 53 is arranged close to the first guiding surface 11. From the end of the bubble-breaking channel 50 close to the first guiding surface 11 to the other end, the gradually converging section 53 is in a converging shape, the inner diameter of the equal-diameter section 54 remains unchanged, and the gradually expanding section 55 is in an expanding shape. In this way, after the bubbles are guided to the vicinity of the outer edge of the backing plate 10, they sequentially pass through the gradually converging section 53, the equal-diameter section 54, and the gradually expanding section 55, and finally escape from the gradually expanding section 55. Among them, the gradually converging section 53 can accelerate the heat convection of the fluid, form a negative pressure, so as to attract the bubbles to flow into the bubble-breaking channel 50. After passing through the gradually converging section 53, the bubbles are compressed to the same diameter as the equal-diameter section 54, and then the bubbles enter the gradually expanding section 55. The bubbles are sheared by turbulence in the gradually expanding section 55 and are tightly fractured into small bubbles and leave the bubble-breaking channel 50. However, it is not limited to this. In other embodiments, the bubble-breaking channel 50 may also include any one or two of the gradually converging section 53, the equal-diameter section 54, and the gradually expanding section 55. In addition, the bubble-breaking channel 50 may also be in other forms, as long as the bubble-breaking channel 50 has a bubble-breaking effect on the bubbles, so that the bubbles can become smaller bubbles after passing through the bubble-breaking channel 50.

[0079] And it is not limited to this. In other embodiments, the second retaining rib 40 extends downward, and the bubble-breaking channel 50 may also be provided on the second retaining rib 40 and horizontally penetrate the inner and outer side surfaces of the second retaining rib 40. In this way, when the bubbles are guided to the vicinity of the edge of the backing plate 10, they can pass through the bubble-breaking channel 50 on the second retaining rib 40 and escape outward. The bubble-breaking channel 50 can also play a role in breaking the bubbles. The stew pot 200 will not block the bubbles escaping from the bubble-breaking channel 50, avoiding the noise generated by the bubbles hitting the stew pot 200.

[0080] Furthermore, as Figure 8 and Figure 9 shown, a first limiting rib 1011 is provided in the heating cavity 110. The first limiting rib 1011 is used to limit the pad rack 500, so that the center of the backing plate 10 is aligned with the center of the heating plate 400. In this way, it can be ensured that there is enough clearance between the edge of the backing plate 10 and the side wall of the heating cavity 110, avoiding affecting the hot water flow of the water body in the heating cavity 110, and avoiding the bubbles escaping from the convection holes 13.

[0081] Further, as Figure 8 and Figure 10 shown, a second limiting rib 1012 is provided in the heating cavity 110, and a limiting groove 23 is provided on the supporting leg 20. The second limiting rib 1012 cooperates with the limiting groove 23 to limit the installation position of the cushion rack 500 in the heating cavity 110. In this way, it is ensured that the cushion rack 500 is accurately installed, so that the broken bubble area 71 is located above the hot end 422 of the heating tube, so as to ensure that the bubbles can enter the broken bubble area 71 when rising, and then escape upward after being broken through the broken bubble channel 50.

[0082] In this embodiment, the supporting leg 20 is connected to the lower end of the second baffle rib 40, but it is not limited thereto. In other embodiments, the supporting leg 20 may also be connected to the lower surface of the cushion plate 10.

[0083] Please refer to Figure 11 and Figure 12 , an anti-fooling structure 80 is provided at the connection between the base 100 and the upper cover 300. The anti-fooling structure 80 includes a positioning rib 81 and a positioning groove 82. One of the positioning rib 81 and the positioning groove 82 is provided on the base 100, and the other is provided on the upper cover 300. The positioning rib 81 cooperates with the positioning groove 82 to limit the covering position of the upper cover 300 on the base 100. In this way, it can be ensured that when the upper cover 300 is covered, the orthographic projection of the air outlet 301 on the cushion plate 10 is at least partially located in the non-broken bubble area 72, so as to ensure that the noise propagation path is longer, thus ensuring the noise reduction effect of the upper cover 300. In this embodiment, the positioning rib 81 is provided at the upper end of the base 100, and the positioning groove 82 is provided on the upper cover 300.

[0084] Further, please refer to Figure 2 and Figure 11 , the air outlet 301 can be arranged on one side of the back of the whole electric slow cooker, and the broken bubble area 71 can be arranged on one side of the front of the whole electric slow cooker. In this way, the propagation path of the noise generated by the bursting of the bubbles in the broken bubble area 71 is the longest, and the outward dissipation of the noise is reduced. At the same time, the water vapor can be kept away from the user, reducing the risk of scalding.

[0085] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0086] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. An electric slow cooker, characterized in that, Including: A base (100), a stewing pot (200), an upper cover (300), and a pad rack (500). A heating cavity (110) is provided inside the base (100). A heating plate (400) is provided on the bottom wall of the heating cavity (110). The heating plate (400) includes a plate body (410) and a heating tube (420) provided below the plate body (410). The pad rack (500) is provided inside the heating cavity (110). The stewing pot (200) is placed on the pad rack (500). The upper cover (300) covers the base (100) to cover the heating cavity (110). The pad rack (500) includes a backing plate (10) and supporting feet (20) provided on the lower side of the backing plate (10). The backing plate (10) includes a foam-breaking area (71) and a non-foam-breaking area (72). A plurality of foam-breaking channels (50) are provided in the foam-breaking area (71) near the outer edge of the backing plate (10). At least in the foam-breaking area (71), a first guiding surface (11) is provided on the lower surface of the backing plate (10). The first guiding surface (11) is arranged in an ascending shape from the center of the backing plate (10) to the outer edge. The upper cover (300) is provided with a vent hole (301). The orthographic projection of the vent hole (301) on the backing plate (10) is at least partially located in the non-foam-breaking area (72).

2. The electric slow cooker according to claim 1, characterized in that, The hot end (422) of the heating tube (420) at least partially coincides with the orthographic projection of the foam-breaking area (71) on the horizontal plane. Or the hot end (422) of the heating tube (420) at least partially coincides with the orthographic projection of the foam-breaking channels (50) on the horizontal plane.

3. The electric slow cooker according to claim 1, wherein A convection hole (13) and a first baffle (30) are provided in the central area of the backing plate (10). The first baffle (30) surrounds the convection hole (13). The first baffle (30) protrudes downward relative to the lower surface of the backing plate (10), and the bottom end of the first baffle (30) is higher than the bottom end of the supporting feet (20). The orthographic projection of the heating tube (420) on the horizontal plane is located outside the orthographic projection of the first baffle (30) on the horizontal plane.

4. The electric slow cooker according to claim 3, wherein A retaining strip (70) that divides the backing plate (10) into the foam-breaking area (71) and the non-foam-breaking area (72) is provided on the lower surface of the backing plate (10). The retaining strip (70) includes two first enclosures (73). Each first enclosure (73) extends from the first baffle (30) towards the outer edge of the backing plate (10).

5. The electric slow cooker according to claim 3, wherein A retaining strip (70) that divides the backing plate (10) into the foam-breaking area (71) and the non-foam-breaking area (72) is provided on the lower surface of the backing plate (10). The retaining strip (70) includes two second enclosures (74) and a third enclosure (75). The third enclosure (75) is an arc-shaped rib. The two second enclosures (74) are respectively connected to both ends of the third enclosure (75) and extend towards the outer edge of the backing plate (10). The convection hole (13) is located in the foam-breaking area (71).

6. The electric slow cooker according to claim 4 or 5, characterized in that One or more third retaining ribs (711) are provided in the bubble crushing area (71). One end of the third retaining rib (711) is connected to the first retaining rib (30), and the other end extends towards the outer edge of the backing plate (10).

7. The electric slow cooker according to claim 1, characterized in that, A second retaining rib (40) is provided at the outer edge of the backing plate (10), and the second retaining rib (40) extends upwards or downwards.

8. The electric slow cooker according to claim 7, wherein, The second retaining rib (40) extends downwards, and the bubble crushing channel (50) is provided on the second retaining rib (40) and transversely penetrates the inner and outer side surfaces of the second retaining rib (40).

9. The electric slow cooker according to claim 1, characterized in that, The bubble crushing channel (50) is provided on the backing plate (10) and longitudinally penetrates the upper and lower side surfaces of the backing plate (10).

10. The electric slow cooker according to claim 8 or 9, characterized in that, The bubble crushing channel (50) includes a gradually converging section (53), an equal-diameter section (54), and a gradually expanding section (55) that are connected in sequence. Among them, the gradually converging section (53) is arranged close to the first guiding surface (11). In the direction from one end of the bubble crushing channel (50) close to the first guiding surface (11) to the other end, the gradually converging section (53) is in a converging shape, the inner diameter of the equal-diameter section (54) remains unchanged, and the gradually expanding section (55) is in an expanding shape.

11. The electric slow cooker according to claim 1, wherein A first limiting rib (1011) is provided in the heating cavity (110). The first limiting rib (1011) is used to limit the pad holder (500) so that the center of the backing plate (10) is aligned with the center of the heating plate (400).

12. The electric slow cooker according to claim 1, wherein A second limiting rib (1012) is provided in the heating cavity (110), and a limiting groove (23) is provided on the support leg (20). The second limiting rib (1012) cooperates with the limiting groove (23) to limit the installation position of the pad holder (500) in the heating cavity (110).

13. The electric slow cooker according to claim 1, wherein, An anti-misassembly structure (80) is provided at the connection between the base (100) and the upper cover (300). The anti-misassembly structure (80) includes a positioning rib (81) and a positioning groove (82). One of the positioning rib (81) and the positioning groove (82) is provided on the base (100), and the other is provided on the upper cover (300). The positioning rib (81) cooperates with the positioning groove (82) to limit the covering position of the upper cover (300) on the base (100).

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