Heating device and steam appliance

Abstract

The application discloses a heating device and a steam electric appliance, wherein the heating device comprises a heating disc assembly, a first heat source, a second heat source, a first temperature sensor and a second temperature sensor, wherein the heating disc assembly has oppositely arranged mounting surfaces and a heating surface, the heating disc assembly is further formed with a convex bump protruding from the heating surface, the convex bump is formed with a mounting groove with an opening on one side of the mounting surface; the first heat source is mounted on the groove bottom wall of the mounting groove; the second heat source is mounted on the mounting surface; the first temperature sensor is arranged in the mounting groove and connected with the groove bottom surface of the mounting groove; and the second temperature sensor is abutted against the mounting surface. The technical scheme of the application can reduce the dry burning risk in the steam electric appliance and prolong the service life of the steam electric appliance.

Description

Technical Field

[0001] This invention relates to the field of household appliances technology, and in particular to a heating device and a steam appliance using the heating device. Background Technology

[0002] Steam appliances, such as electric steamers, steam mops, and electric irons, use a heating device to heat water and generate high-temperature steam for tasks like steaming food, ironing clothes, and cleaning / sterilizing. However, in some technologies, the heating device in these appliances typically has a thermostat installed at the bottom of the heating plate inside the water tank. This means the thermostat only trips and refills when the water in the tank has boiled dry, resulting in intermittent steam production. Repeated dry-burning also shortens the appliance's lifespan. Other solutions use programmed heating time to prevent dry-burning, but this is highly susceptible to errors due to changes in initial water volume or ambient temperature, potentially leading to water overflow or further dry-burning and shortening the appliance's lifespan. Summary of the Invention

[0003] The main objective of this invention is to provide a heating device that aims to reduce the risk of dry burning in steam appliances and extend their service life.

[0004] To achieve the above objectives, the heating device proposed in this invention includes:

[0005] The heating plate assembly has a mounting surface and a heating surface that are disposed opposite to each other. The heating plate assembly also forms a protrusion protruding from the heating surface, and a mounting groove with an opening on one side of the mounting surface is formed in the protrusion.

[0006] The first heat source is installed on the bottom wall of the mounting groove;

[0007] A second heat source is installed on the mounting surface;

[0008] A first temperature sensor is disposed within the mounting slot and connected to the bottom surface of the mounting slot; and

[0009] The second temperature sensor is abutted against the mounting surface.

[0010] The technical solution of this invention involves forming a protrusion on the heating plate assembly of a heating device. This protrusion protrudes from one side of the heating surface and houses two heat sources. One heat source contacts the bottom wall of the mounting groove formed by the protrusion. When the heating device is applied to a steam appliance, during operation, if there is sufficient water in the heating chamber, the protrusion is also covered by water. During heating, due to heat conduction from the water, the temperature values ​​detected by the first and second temperature sensors are similar. However, when the water level in the steam appliance drops, exposing the protrusion above the liquid surface, the heat from the first heat source causes a rapid temperature rise at the protrusion due to the lack of water cooling. Since the second temperature sensor is in contact with the mounting surface and is also covered by water, its detected temperature value remains relatively stable. The temperature values ​​detected by the first and second temperature sensors will show a significant difference. At this point, it can be accurately determined that the water level in the steam appliance has dropped to the level requiring water addition. This provides a reliable control basis for subsequently adding water or stopping the operation of the first heat source, effectively preventing dry burning in the steam appliance and extending its service life.

[0011] Optionally, the second heat source is spaced apart from the sidewall of the mounting groove.

[0012] Optionally, the distance between the second heat source and the sidewall of the mounting groove is not less than 1 mm.

[0013] Optionally, it also includes a first heat-conducting plate, which is installed on the bottom wall of the mounting groove, and the first heat source and the first temperature sensor are respectively abutted against the side of the first heat-conducting plate away from the bottom wall of the mounting groove.

[0014] Optionally, the edge of the first heat-conducting plate is spaced apart from the sidewall of the mounting groove.

[0015] Optionally, the distance between the edge of the first heat-conducting plate and the sidewall of the mounting groove is not less than 1 mm.

[0016] Optionally, the heating plate assembly includes a heating plate and a second heat-conducting plate attached to the bottom surface of the heating plate. The second heat-conducting plate has a clearance opening corresponding to the slot of the mounting groove, and the second heat source is installed on the second heat-conducting plate.

[0017] Optionally, it also includes a first pressure plate connected to the second heat-conducting plate, wherein the first temperature sensor is pressed against the first pressure plate.

[0018] Optionally, it also includes a second pressure plate connected to the second heat-conducting plate, with the second temperature sensor being pressed against the second pressure plate.

[0019] Optionally, the heating device further includes an isolation cover, which covers the convex bulge and cooperates with the convex bulge to form an isolation cavity, and the isolation cover has a communication hole that connects the isolation cavity to the outside.

[0020] Optionally, the isolation cover is mounted on the top surface of the convex bulge opposite to the mounting surface.

[0021] Optionally, the connecting hole includes a first connecting hole formed on the side wall of the convex hull and a second connecting hole formed on the top wall of the convex hull. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the heating device from the bottom view according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the heating device;

[0025] Figure 3 for Figure 1 A top-view structural diagram of the heating device;

[0026] Figure 4 for Figure 3 A cross-sectional view of the central structure;

[0027] Figure 5 This is an exploded structural diagram of a steam appliance according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 A partial structural diagram of a steam-powered electrical appliance;

[0029] Figure 7 for Figure 5 A schematic diagram of another part of the structure of a steam-powered appliance.

[0030] Explanation of icon numbers:

[0031]

[0032]

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] The present invention proposes a heating device 100.

[0038] Please refer to the reference. Figures 1 to 4In one embodiment, the heating device 100 includes a heating plate 111 assembly 110, a first heat source 120, a second heat source 130, a first temperature sensor 140, and a second temperature sensor 150. The heating plate 111 assembly 110 has a mounting surface 110a and a heating surface 110b disposed opposite to each other. The heating plate 111 assembly 110 also forms a protrusion 112 protruding from the heating surface 110b. A mounting groove 110c with an opening on one side of the mounting surface 110a is formed in the protrusion 112. The first heat source 120 is mounted on the bottom wall of the mounting groove 110c, and the second heat source 130 abuts against the mounting surface 110a. In this embodiment, the first heat source 120 and the second heat source 130 can be of the same type. For example, both the first heat source 120 and the second heat source 130 can be heating elements, or they can be of different types. For example, the first heat source 120 can be a PTC heating element, while the second heat source 130 can be a heating element. This application does not impose any restrictions on this. The first heat source 120 and the second heat source 130 can be connected in series or in parallel. The second heat source 130 is the main power source for the heating device 100, while the first heat source 120, located inside the bulge 112, can also play a heating role to some extent, but its primary function is auxiliary temperature detection.

[0039] The heating device 100 proposed in this invention includes a heating plate 111 assembly 110, which is used in conjunction with a steam appliance 300 to form a heating chamber 210a. The heating surface 110b is the side in contact with the liquid, while the mounting surface 110a is the surface facing away from the liquid and used for mounting electronic equipment. It is understood that the heating surface 110b and the mounting surface 110a can be planar or non-planar. A protrusion 112 protrudes from the heating surface 110b. The height of the protrusion 112 from the heating surface 110b is not limited by the amount of liquid remaining before refilling, as long as it ensures that the remaining liquid will not be heated by the residual heat of the second heat source 130 and the heating plate 111 assembly 110, causing dry burning. This application does not impose any limitations on this. During use, the heat generated by the first heat source 120 is transferred to the entire heating plate 111 assembly 110 via the mounting surface 110a, and exchanges heat with the liquid in the steam appliance 300 on the heating surface 110b. Therefore, when the liquid heated on the heating surface 110b covers the bulge 112, the liquid absorbs heat, ensuring that the temperatures detected by the first temperature sensor 140 and the second temperature sensor 150, even if they are installed in different positions, are comparable, or the temperature difference detected by the first temperature sensor 140 and the second temperature sensor 150 is relatively constant. However, when the liquid level on the heating surface 110b drops below the top of the bulge 112, causing the bulge 11... When exposed, the heat transferred from the first heat source 120 will be difficult to conduct through heat transfer at the bulge 112, causing the temperature detected by the first temperature sensor 140 to change significantly compared to the temperature detected when the liquid was covering it. Combined with the above, that is, the temperature detected by the first temperature sensor 140 and the second temperature sensor 150 will have a significant difference. This allows for a clear determination of the liquid level in the steam appliance 300. That is, when the difference between the temperature detected by the first temperature sensor 140 and the temperature detected by the second temperature sensor 150 exceeds a preset value, it indicates that the liquid level in the steam appliance 300 is lower than the top surface of the bulge 112.

[0040] That is, the technical solution of the present invention forms a protrusion 112 on the heating plate 111 assembly 110 of the heating device 100. The protrusion 112 protrudes from one side of the heating surface 110b and is provided with two heat sources. One heat source contacts the bottom wall of the mounting groove 110c formed by the protrusion. Thus, when the heating device 100 is applied to the steam appliance 300, during operation, when there is sufficient water in the heating chamber 210a of the steam appliance 300, the protrusion 112 is also covered by water. During the heating process, due to the heat conduction of water, the detected temperature values ​​of the first temperature sensor 140 and the second temperature sensor 150 are similar. When the water level in the steam appliance 300 drops, causing the protrusion 112 to be exposed above the liquid surface, because... Without the cooling effect of water, the heat from the first heat source 120 will cause the temperature at the protrusion 112 to rise sharply. Since the second temperature sensor 150 is in contact with the mounting surface 110a and is covered by water, the temperature value detected by it is basically stable. The temperature value detected by the first temperature sensor 140 will have a significant difference from the temperature value detected by the second temperature sensor 150. At this time, it can be accurately determined that the water level in the steam appliance 300 has dropped to the height where water needs to be added. This provides a reliable control basis for adding water to the steam appliance 300 or stopping the operation of the first heat source 120, effectively avoiding dry burning in the steam appliance 300 and thus extending the service life of the steam appliance 300.

[0041] It is important to emphasize here that the solution of this invention is superior to the traditional method in preventing dry burning. This is because the solution of this invention compares the temperatures detected by two temperature sensors. Since the temperature changes in real time during operation, and both sensors show similar temperature change trends when there is water coverage, the first temperature sensor 140 will deviate from its original curve when the liquid level is below the top surface of the bulge 112, resulting in a significant deviation from the value detected by the second temperature sensor 150. This method avoids the significant errors inherent in traditional methods that compare a single temperature sensor's detected value with a set value. Understandably, even when the water level in the steam appliance 300 is very low, or even below the top surface of the bulge 112, the solution of this invention, due to the significant deviation between the values ​​from the two temperature sensors, can accurately determine that the liquid level is low. These advantages are difficult to achieve in previous designs.

[0042] Please refer to the reference. Figure 2 and Figure 4In one embodiment, the first heat source 120 is spaced apart from the side wall of the mounting groove 110c. This arrangement is to prevent the heat of the first heat source 120 from being conducted outward through the side wall of the convex 112. When the liquid level is lower than the height of the convex 112, the temperature detection sensitivity of the first temperature sensor 140 is reduced due to the heat loss of the first heat source 120.

[0043] Furthermore, the distance between the first heat source 120 and the sidewall of the mounting groove 110c is greater than or equal to 1 mm. The above distance is set mainly to prevent the heat emitted by the first heat source 120 from being conducted outward to the liquid through the sidewall of the convex 112 via thermal radiation, which would cause the temperature sensor 140 to heat up slowly and reduce the detection sensitivity.

[0044] In one embodiment, the heating device 100 further includes a first heat-conducting plate 115, which is mounted on the bottom wall of the mounting groove 110c. The first heat source 120 and the first temperature sensor 140 respectively abut against the side of the first heat-conducting plate 115 away from the bottom wall of the mounting groove 110c. In this embodiment, the arrangement of the first heat-conducting plate 115 evenly diffuses the heat generated by the first heat source 120 to the bottom wall of the mounting groove 110c, making the temperature detection value of the first temperature sensor 140 more accurate. Furthermore, the edge of the first heat-conducting plate 115 is spaced apart from the side wall of the mounting groove 110c. In this embodiment, the spaced-apart arrangement of the edge of the first heat-conducting plate 115 from the side wall of the mounting groove 110c is also to prevent the heat of the first heat source 120 from being transferred outward through the side wall of the protrusion 112, thereby ensuring that the first temperature sensor 140 is sensitive to temperature rise during detection. Based on this, in this embodiment, the distance between the edge of the first heat-conducting plate 115 and the sidewall of the mounting groove 110c is not less than 1 mm.

[0045] The heating plate 111 assembly 110 includes a heating plate 111 and a second heat-conducting plate 113 attached to one side of the heating plate 111. A first heat source 120 is mounted on the second heat-conducting plate 113, a second temperature sensor 150 is mounted on the second heat-conducting plate 113, a protrusion 112 is formed on the heating plate 111, and the second heat-conducting plate 113 has a clearance opening 114 corresponding to the opening of the mounting groove 110c. In this embodiment, the second heat source 130 is a heating tube fixedly mounted on the second heat-conducting plate 113, and the heating tube is arranged around the edge of the second heat-conducting plate 113. The second heat-conducting plate 113 can be an aluminum plate, and the heating tube and the second heat-conducting plate 113 can be fixed by welding or riveting. This application does not limit this. The second heat-conducting plate 113 enables the temperature of the second heat source 130 to be evenly conducted to the heating plate 111.

[0046] Furthermore, the second heat source 130 is arranged around the edge of the second heat-conducting plate 113. The first temperature sensor 140 and the second temperature sensor 150 are both spaced apart inside the first heat source 120, and the distance between the first temperature sensor 140 and the first heat source 120 and the distance between the second temperature sensor 150 and the first heat source 120 are approximately equal. Since heat is gradually consumed during heat conduction, this embodiment sets the distance between the first temperature sensor 140 and the first heat source 120 and the distance between the second temperature sensor 150 and the first heat source 120 to be approximately equal. This ensures that the heating drive of the first temperature sensor 140 and the second temperature sensor 150 is approximately equal when there is liquid coverage. When the liquid level is lower than the top surface of the convex bulge 112, the heating process of the first temperature sensor 140 will not be too drastic or sluggish. When compared with the second temperature sensor 150, the comparison result is more realistic and accurate.

[0047] In one embodiment, the heating device 100 further includes a first pressure plate 180 and a second pressure plate 190 mounted on the second heat-conducting plate 113. The first pressure plate 180 partially passes through the clearance opening 114 and extends into the mounting groove 110c. The first temperature sensor 140 is pressed against by the first pressure plate 180, that is, the first pressure plate 180 cooperates with the bottom wall of the mounting groove 110c to clamp the first temperature sensor 140. The second temperature sensor 150 is pressed against by the second pressure plate 190, that is, the second pressure plate 190 cooperates with the second heat-conducting plate 113 to clamp the second temperature sensor 150. In this embodiment, a mounting post is fixedly connected to the second heat-conducting plate 113. The first pressure plate 180 and the second pressure plate 190 are fixedly connected to the mounting post. Specifically, through holes can be provided on the first pressure plate 180 and the second pressure plate 190, and the first pressure plate 180 and the second pressure plate 190 can be locked to the mounting post by screws, bolts and other connecting parts. In this embodiment, by setting the first pressure plate 180 and the second pressure plate 190 for pressing, the assembly process can be simplified and the installation structure can be made more stable.

[0048] Please refer to the reference. Figures 5 to 7 In order to further improve the sensitivity of the first temperature sensor 140 when detecting temperature, in one embodiment, the heating device 100 further includes an isolation cover 170, which covers the protrusion 112 and cooperates with the protrusion 112 to form an isolation cavity. The isolation cover 170 has a communication hole 171 that connects the isolation cavity to the outside.

[0049] In actual use, when the liquid level in the steam appliance 300 is lower than the top surface of the convex 112, the water bubbles generated by the first heat source 120 may splash onto the top surface of the convex 112 and be heated and evaporated by the heat transferred from the top surface of the convex 112 by the first heat conduction plate. During the evaporation process, a large amount of heat will be carried away, making the temperature rise of the first temperature sensor 140 sluggish, which leads to inaccurate detection results. In this embodiment, an isolation cover 170 is provided, which covers the protrusion 112 to form an isolation cavity. A connecting hole 171 is also provided. This connecting hole ensures that even when the protrusion 112 is submerged in liquid, liquid can enter the isolation cavity through the connecting hole 171. When the liquid level drops to a certain level, bubbles generated outside the isolation cavity are broken by the connecting hole 171 during entry into the isolation cavity. This prevents the bubbles from bursting in the isolation cavity and causing a large amount of splashed liquid to evaporate on the surface of the protrusion 112, thus avoiding inaccurate temperature readings from the first temperature sensor 140. Accurate temperature information can be obtained and compared with the temperature from the second temperature sensor 150. When the difference reaches a set value, reliable control is provided for adding water to the steam appliance 300 or stopping the first heat source 120, ensuring that dry burning does not occur.

[0050] Furthermore, in this embodiment, the isolation cover 170 is installed on the top surface of the protrusion 112 facing away from the mounting surface 110a. The advantage of this arrangement is that, because the sidewall of the isolation cover 170 is connected to the top wall of the protrusion 112, there is no gap between the sidewall of the isolation cover 170 and the sidewall of the protrusion 112. This avoids the situation where, due to liquid siphoning, the liquid level outside the isolation cover 170 is significantly lower than the liquid level inside the isolation cover 170, yet there is still liquid above the actual liquid level inside the isolation cover 170. This also prevents the liquid inside the isolation cover 170 from evaporating due to heat, which could lead to inaccurate detection values ​​from the first temperature sensor 140 and consequently, inaccurate liquid level determination.

[0051] Furthermore, the connecting hole 171 includes a first connecting hole 172 formed on the side wall of the protrusion 112 and a second connecting hole 173 formed on the top wall of the protrusion 112. The first connecting hole 172 is elongated and extends from the bottom to the top of the protrusion 112. The arrangement of the first connecting hole 172 and the second connecting hole 173 ensures that when the outside of the isolation cover 170 is covered with liquid (i.e., the liquid level is high), the pressure inside the isolation chamber remains consistent with the pressure outside the isolation cover 170. This allows for smoother liquid flow in both locations, reducing the possibility of liquid remaining in the isolation chamber when the liquid level is below the isolation cover 170, thereby improving the temperature detection accuracy of the first temperature sensor 140. Furthermore, it allows for the smooth expulsion of any small air bubbles that may enter the isolation chamber.

[0052] In one embodiment, to further enhance the safety of the heating device 100 during operation, the heating device 100 further includes a thermostat 160. The thermostat 160 is fixedly installed on the second heat-conducting plate 113. The fixed connection method between the thermostat 160 and the second heat-conducting plate 113 can refer to the method of the first temperature sensor 140 and the second temperature sensor 150, which will not be described again here. Specifically, when the temperature detected by the second temperature sensor 150 reaches a preset value, the thermostat 160 can disconnect the circuit supplying power to the first heat source 120 in the steam appliance 300. That is, when the temperature detected by the second temperature sensor 150 indicates that the device is in a dry-burning state, the heating device 100 will stop operating.

[0053] Please refer to the reference. Figures 1 to 7 The present invention also proposes a steam appliance 300, which includes a housing 210, a heating device 100, a control circuit board, and a water pump assembly 260. The specific structure of the heating device 100 is as described in the above embodiments. Since the steam appliance 300 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The housing 210 forms a heating chamber 210a and a water storage tank 210b. The heating device 100 is installed at the bottom of the heating chamber 210a. The water pump assembly 260 connects the water storage tank 210b and the heating chamber 210a. The control circuit board is used to control the water pump assembly 260 to operate when the difference between the temperature detected by the first temperature sensor 140 and the temperature detected by the second temperature sensor 150 is greater than a preset value, so as to draw water from the water storage tank 210b into the heating chamber 210a.

[0054] The steam appliance 300 proposed in this invention can be a commercially available electric steamer, garment steamer, steam mop, steam oven, etc. Figures 5 to 7In the structure shown, the steam appliance 300 takes an electric steamer as an example. The shell includes an outer shell 220, a middle frame 230, and a condensate return pan 240. The outer shell 220 and the middle frame 230 enclose an installation cavity. The condensate return pan 240 and the middle frame 230 cover each other to form the water storage tank 210b and the heating chamber 210a. The condensate return pan 240 has a steam outlet 241 that communicates with the heating chamber 210a. The steam appliance 300 also includes a lid 270, a steamer 280, and other structures. The steamer 280 covers the condensate return pan 240 and cooperates with it to form a buffer cavity. The steamer 280 has multiple steam passage holes evenly distributed on it. The steam passage holes on the steamer 280 are staggered from the steam outlet holes 241 on the condensate return pan 240. When using food, pots, etc., they are placed on the steamer 280. The lid 270 covers the upper opening of the casing 210 and covers the steamer 280. The heating device 100 is installed on the middle frame 230 and covers the bottom of the heating cavity 210a. The water pump assembly 260 and the control circuit board are located inside the mounting cavity.

[0055] The outer shell 220 of this application is bowl-shaped with an open top. The middle frame 230 is connected to the outer shell 220 and forms the mounting cavity on the lower side of the middle frame 230 and in front of the outer shell 220. The condensate return plate 240 covers the upper side of the middle frame 230 to form two parts: a water storage tank 210b and a heating chamber 210a. The outer shell 220, the middle frame 230 and the condensate return plate 240 can all be made of plastic, or the outer shell 220 and the middle frame 230 can be made of plastic, while the condensate return plate 240 can be made of metal. Of course, the outer shell 220, the middle frame 230 and the condensate return plate 240 can also be made of other materials, which is not limited in this application.

[0056] The outer casing 220 and the middle frame 230 can be connected using methods such as snap-fit ​​or screw connections that allow for disassembly without structural damage. Alternatively, they can be fixed together using methods such as adhesive bonding, welding, or riveting that require structural damage for disassembly; this application does not limit the choice of these methods. Similarly, the condensate return pan 240 and the middle frame 230 can also be connected using the aforementioned methods; this application does not restrict this choice. Furthermore, this application includes a handle, which is fixed to the condensate return pan 240 and also to the outer casing 220 and the middle frame 230. A connecting hole can be provided on the handle, and screws can be used to fix the handle, outer casing 220, middle frame 230, and condensate return pan 240 together. Thus, the entire steam appliance 300 can be moved using the handle.

[0057] In one embodiment, the water storage tank 210b is arranged around the outside of the heating chamber 210a. By arranging the water storage tank 210b around the outside of the heating chamber 210a during the use of the steam appliance 300, the high temperature generated in the heating chamber 210a can be absorbed by the water storage tank 210b, preventing the user from directly touching the heating chamber 210a and avoiding the risk of burns. Furthermore, the temperature of the heating chamber 210a is directly transferred to the water storage tank 210b, which absorbs the heat, providing a preheating effect during use. In this embodiment, the water storage tank 210b can surround the heating chamber 210a completely or partially. This application, while maintaining a compact structure, arranges the water storage tank 210b around three-quarters of the heating chamber 210a. Of course, in other embodiments, the water storage tanks 210b can also be arranged side-by-side.

[0058] Please refer to the reference again. Figure 5 In the electric steamer with the above-mentioned solution of this application, during use, the heating plate 110 heats the water in the heating chamber 210a to generate steam. Since the heating chamber 210a is located inside the water storage tank 210b, the heat generated during the high-temperature steam heat radiation process is not easily dissipated. The steam can reach the buffer space between the steaming tray 280 and the condensate return plate 240 through the steam outlet 241 of the condensate return plate 240 and diffuse evenly. Because the condensate return plate 240 only has the steam outlet 241 corresponding to the part of the heating chamber 210a, and the steam outlet 241 and the steam passage hole are staggered, and the steam passage hole is evenly opened on the steaming tray 280, the steam generated by the heating chamber 210a can be well gathered in the space between the condensate return plate 240 and the steaming tray 280 and diffused evenly, instead of rushing out directly. In this way, the food or pot above the steaming tray 280 can be fully heated, and the heat loss is also less. In summary, since the steam appliance of this application is equipped with the aforementioned temperature detection scheme, it can accurately detect when the water volume is low, thus providing an accurate basis for subsequent water addition and preventing dry burning. This ensures continuous steam generation, so there will be no intermittent steam during the steaming process, resulting in better steaming effect and better taste of the food.

[0059] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A heating device, characterized in that, include: The heating plate assembly has a mounting surface and a heating surface that are disposed opposite to each other. The heating plate assembly also forms a protrusion protruding from the heating surface, and a mounting groove with an opening on one side of the mounting surface is formed in the protrusion. A first heat source is installed on the bottom wall of the mounting groove, and the first heat source is spaced apart from the side wall of the mounting groove. A second heat source is installed on the mounting surface; A first temperature sensor is disposed in the mounting slot and connected to the bottom surface of the mounting slot; The first heat-conducting plate is installed on the bottom wall of the mounting groove, and the first heat source and the first temperature sensor are respectively abutted against the side of the first heat-conducting plate away from the bottom wall of the mounting groove. as well as The second temperature sensor is abutted against the mounting surface.

2. The heating device as described in claim 1, characterized in that, The distance between the first heat source and the side wall of the mounting groove is not less than 1 mm.

3. The heating device as described in claim 1, characterized in that, The edge of the first heat-conducting plate is spaced apart from the side wall of the mounting groove.

4. The heating device as described in claim 3, characterized in that, The distance between the edge of the first heat-conducting plate and the sidewall of the mounting groove is not less than 1 mm.

5. The heating device according to any one of claims 1 to 2, characterized in that, The heating plate assembly includes a heating plate and a second heat-conducting plate attached to the bottom surface of the heating plate. The second heat-conducting plate has a clearance opening corresponding to the slot of the mounting groove, and the second heat source is installed on the second heat-conducting plate.

6. The heating device as described in claim 5, characterized in that, It also includes a first pressure plate connected to the second heat-conducting plate, and the first temperature sensor is pressed against the first pressure plate.

7. The heating device as described in claim 5, characterized in that, It also includes a second pressure plate connected to the second heat-conducting plate, and the second temperature sensor is pressed against the second pressure plate.

8. The heating device according to any one of claims 1 to 2, characterized in that, The heating device also includes an isolation cover, which covers the convex bulge and cooperates with the convex bulge to form an isolation cavity. The isolation cover has a connecting hole that connects the isolation cavity to the outside.

9. The heating device as described in claim 8, characterized in that, The isolation cover is installed on the top surface of the convex bulge that is opposite to the mounting surface.

10. The heating device as claimed in claim 8, characterized in that, The connecting holes include a first connecting hole formed on the side wall of the convex hull and a second connecting hole formed on the top wall of the convex hull.

11. A steam appliance, characterized in that, The device includes a housing, a heating device as described in any one of claims 1 to 10, a control circuit board, and a water pump assembly. The housing forms a heating chamber and a water storage tank. The heating device is installed at the bottom of the heating chamber. The water pump assembly connects the water storage tank and the heating chamber. The control circuit board is used to control the water pump assembly to operate to draw water from the water storage tank into the heating chamber when the difference between the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is greater than a preset value.

12. The steam appliance as described in claim 11, characterized in that, The water storage tank is arranged around the outside of the heating chamber.

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