Heating device and cooking equipment

Abstract

The invention relates to a heating device and cooking equipment, the heating device comprises a first sleeve, a heating piece, a second sleeve and a magnetic field generator, the first sleeve is internally provided with a first accommodating cavity, the first accommodating cavity is internally filled with magnetic fluid containing magnetic particles, and the first sleeve is made of a heat-conducting material; the heating piece is used for generating heat and acting on the magnetic fluid in the first containing cavity; the second sleeve is arranged outside the first sleeve in a sleeving mode, a second containing cavity is formed in the interval between the second sleeve and the circumferential face of the first sleeve and used for being filled with liquid for generating steam, the second sleeve is provided with a water inlet and a steam opening, and the water inlet and the steam opening are both communicated with the second containing cavity; the magnetic field generator is used for generating a magnetic field to interfere arrangement of magnetic particles in the magnetofluid. According to the scheme, liquid is prevented from being directly heated by the heating piece, the problems that scaling is prone to occurring on the surface of the heating piece and incrustation is difficult to remove are solved, transmission efficiency can be adjusted according to the temperature of the liquid, and excessive boiling of the liquid is avoided.

Description

Technical Field

[0001] The present application relates to the field of electrical appliance technology, and in particular to a heating device and a cooking device. Background Art

[0002] For example, a cooking device with a steaming function, such as a steamer, is usually provided with a heating plate at the bottom of the inner pot, so that the heating plate heats water to generate high-temperature steam to steam the food. The heating plate heats the water to boil, which is a large container boiling, that is, pool boiling.

[0003] In the context of pool boiling, superheating is related to the boiling curve, which describes the relationship between heat flux and the temperature difference between the heating surface and the saturation temperature of the liquid. In the boiling curve, as the temperature difference between the wall temperature and the saturation temperature increases, the heat flux increases rapidly at first, but after reaching a certain point (called the critical heat flux), the heat flux no longer increases but decreases. This is because under high heat flux, a large number of bubbles generated near the heating wall surface do not have time to diffuse into the mainstream, resulting in the heating wall surface being covered by a layer of vapor film, which worsens the heat transfer, causing the heat flux to drop rapidly, while the wall temperature rises rapidly. This phenomenon is called superheating. Overheating can reduce the heat transfer efficiency of the heating surface and may cause damage to the heating surface.

[0004] It is difficult to control the superheat between the steam heating plate and the liquid surface in the heating plate of existing cooking equipment. Increasing the temperature of the heating plate blindly will cause the boiling curve to enter the over-boiling area, which will reduce the efficiency of steam generation. In addition, the existing heating plate directly heats water. In order to increase the heating area, microstructures are also designed on the surface of the heating plate, but this will cause scale that is difficult to remove to form on the microstructure, and the scale will reduce the heating efficiency. Summary of the invention

[0005] Based on this, it is necessary to provide a heating device and a cooking device to address the problem of low heating efficiency caused by overheating and fouling of the heating and boiling devices of existing cooking devices.

[0006] A heating device comprises a first sleeve, a heating element, a second sleeve and a magnetic field generator, wherein a first cavity is provided inside the first sleeve, the first cavity is filled with a magnetic fluid containing magnetic particles, and the first sleeve is made of a heat-conducting material; the heating element is used to generate heat and act on the magnetic fluid inside the first cavity; the second sleeve is sleeved on the outside of the first sleeve, and the interval between the second sleeve and the circumference of the first sleeve forms a second cavity, the second cavity is used to be filled with a liquid for generating steam, the second sleeve is provided with a water inlet and a steam port, the water inlet and the steam port are both connected to the second cavity; the magnetic field generator is used to generate a magnetic field to interfere with the arrangement of magnetic particles in the magnetic fluid.

[0007] In one embodiment, the heating device further includes a temperature monitoring component, which is used to monitor the temperature of the liquid in the second cavity, and the heating device further includes a control component, which is used to receive the temperature monitored by the temperature monitoring component and control the magnetic field generated by the magnetic field generator to change according to the temperature.

[0008] In one embodiment, the magnetic field generator is cylindrical and is located on the outer periphery of the second sleeve.

[0009] In one embodiment, the temperature monitoring component is cylindrical, and the temperature monitoring component is sleeved outside the first sleeve and covers the circumference of the first sleeve.

[0010] In one of the embodiments, a heat-conducting groove is recessed on a wall surface of the first sleeve facing the heating element.

[0011] In one embodiment, there are multiple heat-conducting grooves, and the multiple heat-conducting grooves are distributed in a circumferential array along the first sleeve to form a heat-conducting ring, and the multiple heat-conducting rings are distributed in an axial array along the first sleeve.

[0012] In one embodiment, each of the heat-conducting grooves has a rectangular cross-section in the axial direction and the radial direction of the first sleeve, and the relationship between the width a and the depth h of the heat-conducting groove is: 0.6h≤a≤0.8h.

[0013] In one embodiment, the width a of the heat-conducting groove is in the range of 0.45 mm ≤ a ≤ 0.6 mm, and the depth h of the heat-conducting groove is in the range of 0.56 mm ≤ h ≤ 0.75 mm.

[0014] In one of the embodiments, the heating device further comprises a valve body, wherein the valve body is used to open and close the water inlet, and each water inlet corresponds to one valve body.

[0015] In one embodiment, the first sleeve is sleeved on the outside of the heating element, and the first sleeve and the heating element are spaced apart in the radial direction of the heating element to form the first cavity.

[0016] A cooking device comprises a heating device as described in any one of the above embodiments.

[0017] The heating device provided in the above scheme, by arranging a magnetic fluid between the heating element and the liquid for generating steam in the second chamber, transfers heat through the magnetic fluid to avoid the heating element directly heating the liquid, thereby avoiding the problem of easy scaling and difficult scale removal on the surface of the heating element, and achieving the effect that the surface of the heating device is not easy to scale and the scale is easy to remove. A magnetic field generator is arranged externally to control the arrangement of magnetic particles inside the magnetic fluid, thereby achieving efficient heat conduction of the magnetic fluid, but the transfer efficiency can be adjusted according to the temperature of the liquid, avoiding excessive boiling of the liquid in the second chamber such as pool boiling, thereby ensuring the stability of the steam generation efficiency of the heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of a heating device in one embodiment of the present application.

[0019] Figure 2 for Figure 1 Schematic cross-sectional view of the heating device.

[0020] Figure 3 for Figure 1 Another cross-sectional schematic diagram of the heating device.

[0021] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the first sleeve.

[0022] Figure 5 for Figure 4 Enlarged schematic diagram at point A in the middle.

[0023] Description of reference numerals:

[0024] 100. Heating device; 110. First sleeve; 111. First cavity; 112. Heat conduction groove; 120. Magnetic fluid; 130. Heating element; 140. Second sleeve; 141. Second cavity; 142. Water inlet; 143. Steam outlet; 150. Magnetic field generator; 160. Temperature monitoring element; 170. Valve body; 180. Fixed component. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0031] In one embodiment of the present application, a cooking device is provided, which can be a steamer, a steam oven, or any existing cooking device with a steaming function, without limitation. The cooking device includes a heating device 100 as in any of the above embodiments, and the heating device 100 generates steam for steaming food to achieve steaming of the food.

[0032] See also Figure 1 , Figure 1 A schematic structural diagram of a heating device 100 in an embodiment of the present application is shown. The heating device 100 provided in an embodiment of the present application can be applied to the above-mentioned cooking equipment and can also be applied to other fields.

[0033] Combination Figure 2 As shown, Figure 2 A schematic cross-sectional structure diagram of a heating device 100 in an embodiment of the present application is shown, wherein the heating device 100 includes a first sleeve 110, a heating element 130, a second sleeve 140 and a magnetic field generator 150, wherein a first cavity 111 is provided inside the first sleeve 110, and the first cavity 111 is filled with a magnetic fluid 120 containing magnetic particles, wherein the magnetic fluid 120 is formed by nanoscale magnetic particles dispersed in a carrier liquid, and the first sleeve 110 is made of a heat-conducting material, so that the heat of the magnetic fluid 120 located inside the first cavity 111 can be transferred to the outside of the first sleeve 110 through the first sleeve 110.

[0034] The heating element 130 is used to generate heat and act on the magnetic fluid 120 inside the first cavity 111 to heat the magnetic fluid 120. In some embodiments, the heating element 130 may be an electric heater or a burner, which directly contacts the magnetic fluid 120 to heat the magnetic fluid 120. In this embodiment, the heating element 130 is an electric heating rod as an example for illustration.

[0035] like Figure 2 and Figure 3As shown, in one embodiment, the heating element 130 is located inside the first sleeve 110, the first sleeve 110 is sleeved on the outside of the heating element 130, and the first sleeve 110 and the heating element 130 are spaced apart in the radial direction of the heating element 130 to form a first cavity 111, and the magnetic fluid 120 inside the first cavity 111 is heated by the heating element 130 at the periphery of the heating element 130.

[0036] like Figure 2 and Figure 3 As shown, the second sleeve 140 is sleeved on the outside of the first sleeve 110, and the interval between the second sleeve 140 and the circumference of the first sleeve 110 forms a second cavity 141, and the second cavity 141 is used to fill the liquid for generating steam. In this embodiment, the second cavity 141 is used to fill water. The liquid in the second cavity 141 receives heat from the magnetic fluid 120 to heat the liquid to vaporization, thereby obtaining hot steam for steaming food.

[0037] like Figure 2 As shown, the second sleeve 140 is provided with a water inlet 142 and a steam port 143, both of which are connected to the second cavity 141. The water inlet 142 is used to input liquid into the second cavity 141, and the steam port 143 is used to allow the steam generated inside the second cavity 141 to flow out to the cooking cavity of the inner pot of the cooking device for steaming food.

[0038] It is understood that in the absence of an external magnetic field, the magnetic nanoparticles in the magnetic fluid 120 are randomly distributed due to thermal motion (Brownian motion). When an external magnetic field is applied, these particles tend to be arranged along the direction of the magnetic field due to magnetization, forming a chain or columnar structure. This arrangement reduces the thermal resistance between particles because heat energy can be more effectively transferred through the heat conduction path formed by these magnetic particles, thereby improving the thermal conductivity of the magnetic fluid 120.

[0039] As 2 and Figure 3 As shown, the magnetic field generator 150 is used to generate a magnetic field to interfere with the arrangement of magnetic particles in the magnetic fluid 120. In this embodiment, the magnetic field generator 150 is an electromagnetic coil, which controls the arrangement of magnetic particles in the magnetic fluid 120 by adjusting the intensity and direction of the magnetic field, thereby changing the thermal conductivity of the magnetic fluid 120.

[0040] like Figure 1 and Figure 2 As shown, the heating device 100 further includes a fixing component 180 , and two fixing components 180 are respectively disposed at both ends of the second sleeve 140 and the first sleeve 110 , so that the fixing components 180 at both ends and the first sleeve 110 and the second sleeve 140 together enclose a second cavity 141 .

[0041] In this embodiment, if Figure 2 As shown, two ends of the heating element 130 are respectively connected to two fixing components 180 , so that the first sleeve 110 , the heating element 130 and the two fixing components 180 together enclose a first cavity 111 filled with the magnetic fluid 120 .

[0042] like Figure 2 and Figure 3 As shown, in one embodiment, the heating device 100 also includes a temperature monitoring component 160, which is used to monitor the temperature of the liquid in the second cavity 141. By real-time monitoring the temperature of the liquid inside the second cavity 141, the temperature monitoring component 160 is used to accurately control the boiling temperature of the liquid, so as to provide a basis for adjusting the magnetic field of the magnetic field generator 150.

[0043] In this embodiment, the heating device 100 further includes a control component, which is used to receive the temperature monitored by the temperature monitoring component 160 and control the magnetic field generated by the magnetic field generator 150 to change according to the temperature. In other embodiments, the control component can also detect parameters such as the magnetic field strength and the heating power of the heating component 130 in real time to control the working state of the heating device 100 and the efficiency of generating steam as a whole. In other embodiments, the magnetic field generator 150 can also be adjusted manually.

[0044] In other embodiments, the magnetic field generator 150 may also be a permanent magnet. By automatically or manually adjusting the distance between the permanent magnet and the magnetic fluid 120 , the arrangement of magnetic particles inside the magnetic fluid 120 can be adjusted, thereby changing the thermal conductivity of the magnetic fluid 120 .

[0045] It is understandable that the magnetic fluid 120 is located outside the heating element 130, and the liquid in the second chamber 141 is located outside the magnetic fluid 120 and the first sleeve 110. The heat transfer efficiency between the liquid and the magnetic fluid 120 changes due to the change in the radial arrangement of the magnetic particles in the magnetic fluid 120. Figures 1 to 3 As shown, in one embodiment, the magnetic field generator 150 is cylindrical and is located at the outer periphery of the second sleeve 140, so that the radial arrangement of the magnetic particles in the magnetic fluid 120 located in the first cavity 111 is uniform in the axial direction, and the heat transfer efficiency of the magnetic fluid 120 in the axial direction is uniform.

[0046] like Figure 2 and Figure 3 As shown, in one embodiment, the temperature monitoring component 160 is cylindrical, and the temperature monitoring component 160 is sleeved on the outside of the first sleeve 110 and covers the circumference of the first sleeve 110, so that the temperature monitoring component 160 can monitor the temperature of the liquid at different positions in the second cavity 141, thereby facilitating the inference of the thermal conductivity uniformity of the magnetic fluid 120.

[0047] like Figures 2 to 4 As shown, in one embodiment, a heat-conducting groove 112 is recessed on the wall surface of the first sleeve 110 facing the heating element 130, so that the wall surface area in contact between the first sleeve 110 and the magnetic fluid 120 is increased, thereby greatly increasing the heat transfer area and the thermal conductivity efficiency, further improving the steam generation efficiency.

[0048] like Figure 4 As shown, in one embodiment, there are multiple heat-conducting grooves 112, and the multiple heat-conducting grooves 112 are distributed along the circumferential array of the first sleeve 110 to form a heat-conducting ring, and the multiple heat-conducting rings are distributed along the axial array of the first sleeve 110 to make the thermal conductivity efficiency of the first sleeve 110 and the magnetic fluid 120 uniform everywhere.

[0049] like Figure 4 and Figure 5 As shown, in one embodiment, the cross-section of each heat-conducting groove 112 in the axial and radial directions of the first sleeve 110 is rectangular to obtain a better heat exchange effect. In other embodiments, the cross-section of the heat-conducting groove 112 may also be a trapezoidal or triangular structure.

[0050] In this embodiment, the relationship between the width a and the depth h of the heat conducting groove 112 is: 0.6h≤a≤0.8h, at this time, the thermal resistance is small and the heat exchange effect is good. In this embodiment, the relationship between the width a and the depth h of the rectangular cross section is a=0.8h.

[0051] In one embodiment, after multiple verifications, the width a of the heat-conducting groove 112 is in the range of 0.45 mm ≤ a ≤ 0.6 mm, and the depth h of the heat-conducting groove 112 is in the range of 0.56 mm ≤ h ≤ 0.75 mm. In this case, the heat exchange efficiency of the first sleeve 110 is better.

[0052] In one embodiment, the heating device 100 further includes a valve body 170, which is used to open and close the water inlet 142 to accurately control the amount of liquid inside the second cavity 141. Optionally, the second cavity 141 may be provided with a plurality of water inlets 142, and each water inlet 142 corresponds to a valve body 170. Preferably, the second cavity 141 is provided with at least three water inlets 142. Combined with the temperature monitoring member 160 provided on the outer surface of the first sleeve 110 to accurately control the temperature of liquid boiling, the water inlet amount of the second cavity 141 is accurately controlled, and the steam generation efficiency is further improved.

[0053] When the heating device 100 in the above scheme is used, the heating element 130 is first started to work to generate heat, and the heat is directly transferred to the magnetic fluid 120 inside the first cavity 111, and the temperature of the magnetic fluid 120 rises. The external magnetic field generator 150 generates a magnetic field acting on the magnetic fluid 120, which changes the arrangement of magnetic particles inside the magnetic fluid 120 by adjusting the intensity and direction of the magnetic field, thereby changing the heat conduction path and rate inside the magnetic fluid 120, and optimizing the heat transfer efficiency. The heated magnetic fluid 120 transfers heat to the liquid inside the second cavity 141 through the first sleeve 110. After the liquid absorbs the heat, the temperature rises until the liquid temperature reaches the vaporization temperature and generates steam. The generated steam is transported to the cooking cavity in the inner pot of the cooking device through the steam port 143 for steaming food.

[0054] The heating device 100 provided in the above scheme, by arranging the magnetic fluid 120 between the heating element 130 and the liquid for generating steam in the second cavity 141, transfers heat through the magnetic fluid 120 to avoid the heating element 130 directly heating the liquid, thereby avoiding the problem that the surface of the heating element 130 is easy to scale and the scale is difficult to remove, and the effect that the surface of the heating device 100 is not easy to scale and the scale is easy to remove is achieved. A magnetic field generator 150 is arranged outside to control the arrangement of magnetic particles inside the magnetic fluid 120, so as to achieve efficient heat conduction of the magnetic fluid 120, but the transfer efficiency can be adjusted according to the temperature of the liquid, so as to avoid excessive boiling of the liquid in the second cavity 141 such as pool boiling, thereby ensuring the stability of the steam generation efficiency of the heating device 100.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A heating device, characterized in that: The heating device comprises: A first sleeve, having a first cavity inside, the first cavity is filled with a magnetic fluid containing magnetic particles, and the first sleeve is made of a heat-conducting material; A heating element, used to generate heat and act on the magnetic fluid in the first cavity; a second sleeve, which is sleeved on the outside of the first sleeve, and the interval between the second sleeve and the circumference of the first sleeve forms a second cavity, the second cavity is used to be filled with liquid for generating steam, the second sleeve is provided with a water inlet and a steam port, the water inlet and the steam port are both connected to the second cavity; and The magnetic field generator is used to generate a magnetic field to interfere with the arrangement of magnetic particles in the magnetic fluid.

2. The heating device according to claim 1, characterized in that The heating device also includes a temperature monitoring component, which is used to monitor the temperature of the liquid in the second cavity, and the heating device also includes a control component, which is used to receive the temperature monitored by the temperature monitoring component and control the magnetic field generated by the magnetic field generator to change according to the temperature.

3. The heating device according to claim 2, characterized in that: The magnetic field generator is cylindrical and is located on the outer periphery of the second sleeve.

4. The heating device according to claim 2, characterized in that: The temperature monitoring component is in a cylindrical shape, and is sleeved outside the first sleeve and covers the circumference of the first sleeve.

5. The heating device according to claim 1, characterized in that: A heat-conducting groove is recessed on a wall surface of the first sleeve facing the heating element.

6. The heating device according to claim 5, characterized in that: There are multiple heat-conducting grooves, and the multiple heat-conducting grooves are distributed in a circumferential array along the first sleeve to form a heat-conducting ring. The multiple heat-conducting rings are distributed in an axial array along the first sleeve.

7. The heating device according to claim 5 or 6, characterized in that: The cross-sections of each of the heat-conducting grooves in the axial direction and the radial direction of the first sleeve are both rectangular, and the relationship between the width a and the depth h of the heat-conducting grooves is: 0.6h≤a≤0.8h.

8. The heating device according to claim 7, characterized in that: The width a of the heat-conducting groove is in the range of 0.45 mm ≤ a ≤ 0.6 mm, and the depth h of the heat-conducting groove is in the range of 0.56 mm ≤ h ≤ 0.75 mm.

9. The heating device according to claim 1 or 2, characterized in that: The heating device also includes a valve body, which is used to open and close the water inlet, and each water inlet corresponds to a valve body.

10. The heating device according to claim 1, characterized in that The first sleeve is sleeved on the outside of the heating element, and the first sleeve and the heating element are spaced apart in the radial direction of the heating element to form the first cavity.

11. A cooking device, characterized in that: The invention comprises a heating device as claimed in any one of claims 1 to 10.

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