Heating assembly and electric heater

Abstract

The application relates to a heating assembly and an electric heater. The heating assembly comprises a base body and a heating wire. The base body comprises a support body and at least two insulating support pieces. Each insulating support piece has a positioning groove, and all the insulating support pieces are arranged on the support body in a spaced manner. The heating wire is arranged on the base body and is clamped into the positioning groove of each insulating support piece and is supported by the insulating support piece. The heating assembly is matched with the heating wire through the positioning groove by the insulating support piece to support and position the heating wire on the support body. In this way, the movement of the heating wire is limited by the insulating support piece, the probability of movement is reduced, the probability of turn-to-turn short circuit is correspondingly reduced, and the probability of problems such as high temperature and even fire caused by the change of heating power is also reduced.

Description

Technical Field

[0001] This application relates to the field of heating equipment technology, and in particular to a heating element and an electric heater. Background Technology

[0002] In related technologies, household air conditioners, heaters, electric fireplaces, clothes dryers, and other electric heating appliances that require blowing hot air have PTC heaters at the air outlet to heat the airflow and achieve the purpose of blowing hot air. PTC heaters are temperature sensitive, and their resistance increases abruptly as the temperature of the resistor body rises. As the temperature increases, the power of the PTC heater decreases, resulting in disadvantages such as long heating time and slow heating.

[0003] In comparison, heating wires heat up faster and reach the target temperature more quickly. However, heating wires are prone to shifting, which can lead to problems such as inter-turn short circuits. Utility Model Content

[0004] Therefore, it is necessary to provide a heating component that can reduce the probability of the heating wire shifting, in order to address the above problems.

[0005] A heating element, the heating element comprising:

[0006] The substrate includes a support body and at least two insulating support sheets, each of which has a positioning groove, and all the insulating support sheets are spaced apart from the support body; and

[0007] The heating wire is disposed in the substrate and is inserted into the positioning groove of each of the insulating support sheets, and is supported by the insulating support sheets.

[0008] The aforementioned heating element utilizes an insulating support plate that engages with the heating wire via a positioning groove to support and position the heating wire on the support body. This restricts the movement of the heating wire by the insulating support plate, reducing the probability of misalignment and consequently decreasing the likelihood of inter-turn short circuits. This, in turn, also reduces the probability of high temperatures or even fires caused by variations in heating power.

[0009] In one embodiment, the support body includes a first support body and a second support body, the first support body and the second support body being spaced apart; the insulating support sheet is disposed between the first support body and the second support body, and the opening of the positioning groove faces the first support body or the second support body.

[0010] In this way, the first and second supports can form a space to accommodate the heating wire, allowing airflow to pass through and exchange heat with the heating wire. At the same time, the first and second supports together limit the insulating support sheet between them and have a certain sealing effect on the opening of the positioning groove, reducing the probability of the heating wire falling out of the positioning groove.

[0011] In one embodiment, the support extends at least partially along a first arc.

[0012] All the insulating support sheets are spaced apart along the extension direction of the support body, and the opening of the positioning groove of each insulating support sheet is configured to face away from the center of the first arc.

[0013] Thus, after the heating wire is installed into the substrate, its overall extension direction roughly conforms to the shape of the support. After the heating wire is inserted into the positioning groove, the groove opening is on the outer side of its arc, making it difficult for the heating wire to detach from the positioning groove.

[0014] In one embodiment, the heating element further includes a thermostat disposed on the substrate and electrically connected to the heating wire.

[0015] In this way, the heating element, by being equipped with a thermostat, limits the operating temperature of the air it heats, preventing the support structure from deforming, melting, or even burning due to excessive heat. Furthermore, temperature control also prevents problems such as overheating and oxidation of the heating wire, which can lead to reduced heating wire lifespan, increased resistance, or decreased power.

[0016] In one embodiment, the heating component further includes a mounting clip disposed on the support body, and the thermostat is engaged with the mounting clip;

[0017] And / or, the heating wire and the temperature controller are respectively located on both sides of the support; the support has a detection vent, and the temperature controller is set corresponding to the detection vent.

[0018] In this way, the thermostat can be quickly installed by engaging with the mounting clips, eliminating the need for screws. Hot air from the heating element side can pass through the detection vent and act on the thermostat, allowing it to more accurately sense the temperature of the air being heated by the heating element.

[0019] In one embodiment, the heating component has an air inlet side and an air outlet side disposed opposite to each other in a first direction;

[0020] The heating component includes at least two heating wires, and along the first direction, the projections of different heating wires do not overlap or partially overlap.

[0021] Each of the insulating support sheets has at least two positioning grooves, and all the heating wires are respectively inserted into different positioning grooves.

[0022] In this way, the windward surfaces formed by the different heating wires do not completely overlap, and are at least partially misaligned with each other on a plane perpendicular to the first direction. The windward area that can be formed by all the heating wires is larger, which is beneficial for fully heating the target and improving heating efficiency.

[0023] In one embodiment, all of the heating wires are spaced apart in the first direction;

[0024] And / or, the groove depth direction of the positioning groove intersects with the first direction, and the groove depth of each positioning groove of each insulating support sheet is different.

[0025] In this way, in addition to being at least partially misaligned with each other on a plane perpendicular to the first direction, the different heating wires are also spaced apart from each other in the first direction, which helps to reduce the probability of contact between the different heating wires. By inserting the different heating wires into the bottom of their respective positioning slots, the effect of at least partially misaligning the different heating wires on a plane perpendicular to the first direction is achieved, and the projections of the different heating wires do not overlap or only partially overlap along the first direction.

[0026] In one embodiment, the heating component includes at least two sets of heating groups, each set of heating groups including at least one heating wire;

[0027] All of the heating elements are connected in parallel and configured to operate independently of each other.

[0028] In this way, the heating element can control the operation of each heating group according to the required power. When low-power heating is required, some or one group of heating groups will operate; when maximum power heating is required, all heating groups will operate simultaneously.

[0029] In one embodiment, the insulating support sheet has a first snap-fit ​​structure, and the support body has a second snap-fit ​​structure, wherein the first snap-fit ​​structure and the second snap-fit ​​structure are configured to snap-fit ​​into each other.

[0030] In this way, the insulating support sheet and the support body can be engaged through the first and second snap-fit ​​structures to fix them together.

[0031] In one embodiment, the first snap-fit ​​structure is a first concave-convex structure, and the second snap-fit ​​structure is a second concave-convex structure. The first concave-convex structure and the second concave-convex structure are configured to engage with each other. The insulating support sheet engages with the support body through the first concave-convex structure and the second concave-convex structure.

[0032] In this way, after the heating wire is inserted into the positioning groove, the insulating support sheet can be engaged with the support body by snapping, and the interlocking of the concave and convex structures can form a stable position, which facilitates the assembly of the heating component.

[0033] In one embodiment, the insulating support sheet has two first concave-convex structures, and the support body has two second concave-convex structures;

[0034] The two first concave-convex structures correspond one-to-one with the two second concave-convex structures, and the two first concave-convex structures are spaced apart.

[0035] Thus, the two first concave-convex structures respectively cooperate with the two second concave-convex structures, creating two-point support, which helps improve the installation stability of the insulating support sheet. Specifically, the distance between the two first concave-convex structures is not less than 8mm, so as to meet a certain stress stability after assembly.

[0036] An electric heater includes a heating element as described above.

[0037] In the aforementioned electric heater, the heating element utilizes an insulating support plate that engages with the heating wire via a positioning groove to support and position the heating wire on the support body. This restricts the movement of the heating wire by the insulating support plate, reducing the probability of misalignment and consequently decreasing the likelihood of inter-turn short circuits. This, in turn, also reduces the probability of high temperatures or even fires caused by variations in heating power.

[0038] In one embodiment, the electric heater includes a housing, and the heating element is disposed within the housing;

[0039] The outer casing has an air outlet, and the air outlet is either annular or fan-shaped.

[0040] The support includes a mounting part, which is annular or fan-shaped and is arranged corresponding to the air outlet. The heating wire is disposed in the mounting part.

[0041] Each of the insulating support pieces is disposed radially on the mounting portion, and all the insulating support pieces are spaced apart from each other in the circumferential direction of the mounting portion.

[0042] In this way, the airflow from the outlet is more diffused, and with the same airflow area, the annular or fan-shaped outlet can cover a larger area. In addition, the insulating support sheet supports the heating wire to correspond with the air outlet, so that the airflow blown outward through the outlet can be evenly heated by the heating wire. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of the heating component in one embodiment of this application.

[0045] Figure 2 for Figure 1 The diagram shows the structure of the heating element from another angle.

[0046] Figure 3 for Figure 1 The diagram shows a cross-sectional structure of the heating element.

[0047] Figure 4 for Figure 3 The diagram shows an enlarged view of the heating element at point A.

[0048] Figure 5 for Figure 1 The diagram shows the structure of the insulating support sheet in the heating element.

[0049] Figure 6 for Figure 1 The diagram shows the structure of the heating element in which the insulating support sheet and the heating wire work together.

[0050] Figure 7 for Figure 1 The diagram shows the structure of the temperature controller in the heating element.

[0051] Figure 8 for Figure 1 The diagram shows the structure of the heating element at the thermostat.

[0052] Figure 9 for Figure 8 The diagram shows the structure of the heating element after the thermostat is hidden.

[0053] Figure 10 This is a schematic diagram of the structure of an electric heater in one embodiment of this application.

[0054] Figure 11 for Figure 10 The diagram shows a partial cross-sectional structure of the electric heater.

[0055] Figure 12 This is a schematic diagram of the structure of the heating component in another embodiment of this application, showing the cooperation between the insulating support sheet and the heating wire.

[0056] Explanation of reference numerals in the attached drawings: 100, heating element; 10, substrate; 11, support body; 111, first support body; 113, second support body; 115, second concave-convex structure; 117, detection vent; 13, insulating support sheet; 131, positioning groove; 133, first concave-convex structure; 135, third concave-convex structure; 30, heating wire; 50, thermostat; 70, mounting clip; 200, electric heater; 210, outer shell; 211, air outlet; 213, air inlet; 230, motor; 250, fan blade; 270, air duct. Detailed Implementation

[0057] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0058] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0059] Furthermore, where the term "and / or" appears, it merely describes the relationship between related objects and indicates that three relationships can exist. For example, A and / or B can represent the relationship between A and B: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates an "or" relationship between the related objects before and after it. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, four, five, etc., unless otherwise explicitly specified.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0063] As described in the background section, the PTC heaters used in related technologies are semiconductor heating elements, which are temperature sensitive, and their resistance increases abruptly with rising temperature. During low-temperature startup, there is a surge of 2 to 2.5 times the operating current, which can have a certain impact on the power grid and household appliances. Furthermore, compared to heating wires, PTC heaters are more expensive, have a larger heating element volume, and lower power density, resulting in a less compact overall structure.

[0064] Please see Figures 1 to 6 The heating component provided in one embodiment of this application includes a substrate 10 and a heating wire 30. The substrate 10 includes a support body 11 and at least two insulating support sheets 13. Each insulating support sheet 13 has a positioning groove 131, and all insulating support sheets 13 are spaced apart from the support body 11. The heating wire 30 is disposed in the substrate 10 and is inserted into the positioning groove 131 of each insulating support sheet 13, and is supported by the insulating support sheet 13.

[0065] Understandably, to achieve their normal function, both the support body 11 and the insulating support sheet 13 are made of high-temperature resistant materials, enabling them to operate normally under the heating state of the heating wire 30. The insulating support sheet 13 has certain strength and thickness requirements, and its thickness can be in the range of 0.3mm-3.0mm. The material can be, but is not limited to, mica, ceramic, etc., that is, the insulating support sheet 13 can be made of mica sheet or ceramic sheet. Preferably, the insulating support sheet 13 is made of mica, as mica sheets have the advantage of being easy to process.

[0066] The heating wire 30 is a resistance heating element and is fixed to the insulating support plate 13 via a positioning groove 131. Specifically, the heating wire 30 can adopt a spring-type or corrugated structure (e.g., Figure 12 As shown, the heating wire 30 can be segmented and inserted into different positioning slots 131 along its longitudinal direction to prevent the heating wire 30 from shifting. Furthermore, the heating wire 30 can also be sheet-like or other shapes. The heating wire 30 has terminals at both ends along its longitudinal direction, and can be connected to a power source through these terminals.

[0067] The aforementioned heating element utilizes an insulating support plate 13 that engages with the heating wire 30 via a positioning groove 131 to support and position the heating wire 30 on the support body 11. This restricts the movement of the heating wire 30 by the insulating support plate 13, reducing the probability of misalignment and consequently minimizing the risk of inter-turn short circuits. This further reduces the likelihood of high temperatures or even fires caused by variations in heating power. Furthermore, because the heating element uses the heating wire 30 as the heating source, it also offers advantages such as high average power during heating, rapid temperature rise, small size, and no inrush current.

[0068] In some embodiments, the support 11 includes a first support 111 and a second support 113, which are spaced apart. An insulating support sheet 13 is disposed between the first support 111 and the second support 113, and the opening of the positioning groove 131 faces the first support 111 or the second support 113.

[0069] Understandably, the first support 111 and the second support 113 are spaced apart, together defining a receiving space for accommodating the heating wire 30. Accordingly, the insulating support sheet 13 is located within this receiving space to support the heating wire 30.

[0070] The gap between the side of the positioning groove 13 formed by the insulating support sheet 13 and the first support 111 or the second support 113 facing it is smaller than the size of the heating wire 30.

[0071] Thus, the first support 111 and the second support 113 can form a space to accommodate the heating wire 30, allowing airflow to pass through and exchange heat with the heating wire 30. At the same time, the first support 111 and the second support 113 together limit the insulating support sheet 13 between them and have a certain sealing effect on the opening of the positioning groove 131, reducing the probability of the heating wire 30 falling out of the positioning groove 131.

[0072] In some embodiments, the support body 11 extends at least partially along the first arc. All insulating support pieces 13 are spaced apart along the extension direction of the support body 11, and the opening of the positioning groove 131 of each insulating support piece 13 is configured to face away from the center of the first arc.

[0073] Thus, after the heating wire 30 is installed into the base 10, its overall extension direction roughly conforms to the shape of the support 11. After the heating wire 30 is inserted into the positioning groove 131 from the opening of the positioning groove 131, the arc dimension at the opening of the groove is larger than the arc dimension at the bottom of the groove, so the heating wire 30 is not easy to detach from the positioning groove 131.

[0074] In some embodiments, the support 11 includes a mounting portion, which is annular or fan-shaped, a heating wire 30 is disposed in the mounting portion, and each insulating support piece 13 is disposed in the mounting portion radially, and all the insulating support pieces 13 are spaced apart from each other in the circumferential direction of the mounting portion.

[0075] The first arc is circular, and the mounting part is the portion of the support body 11 extending along the first arc. The support body 11 has an overall near-ring structure, with the first support body 111 as the outer ring and the second support body 113 as the inner ring. The insulating support plates 13 are fixed between the first support body 111 and the second support body 113, arranged radially. After assembly, the insulating support plates 13 are restrained by both, making them less prone to detachment. The insulating support plates 13 can be evenly or unevenly distributed, as long as they can stably support the high-temperature heating wire 30 at different positions.

[0076] In some embodiments, the insulating support sheet 13 has a first snap-fit ​​structure, and the support body 11 has a second snap-fit ​​structure, the first snap-fit ​​structure and the second snap-fit ​​structure being configured to snap-fit ​​into each other.

[0077] Thus, the insulating support sheet 13 and the support body 11 can be engaged through the first snap-fit ​​structure and the second snap-fit ​​structure to fix them together.

[0078] Furthermore, the first snap-fit ​​structure is a first concave-convex structure 133, and the second snap-fit ​​structure is a second concave-convex structure 115. The first concave-convex structure 133 and the second concave-convex structure are configured to engage with each other. The insulating support sheet 13 is snap-fitted with the support body 11 through the first concave-convex structure 133 and the second concave-convex structure.

[0079] Understandably, one of the first concave-convex structure 133 and the second concave-convex structure 115 can be a groove, and the other can be a protrusion that mates with the groove.

[0080] In this way, after the heating wire 30 is inserted into the positioning groove 131, the insulating support plate 13 can then be engaged with the support body 11 by snapping, and the engagement between the concave and convex structures can form a stable position, which facilitates the assembly of the heating component.

[0081] Furthermore, the insulating support sheet 13 has two first concave-convex structures 133, and the support body 11 has two second concave-convex structures 115. The two first concave-convex structures 133 correspond one-to-one with the two second concave-convex structures 115, and the two first concave-convex structures 133 are spaced apart.

[0082] Thus, the two first concave-convex structures 133 respectively cooperate with the two second concave-convex structures 115 to generate two-point support, which helps to improve the installation stability of the insulating support sheet 13. Specifically, the distance between the two first concave-convex structures 133 is not less than 8mm, so as to meet a certain stress stability after assembly.

[0083] In some other embodiments, the insulating support sheet 13 may also be fitted with the support body 11 by means of bonding, riveting or other methods; or, the insulating support sheet 13 may be integrally formed with the support body 11.

[0084] In some embodiments, the heating component has a first direction (e.g. Figure 4 The air inlet and outlet sides are arranged opposite each other in the X direction shown. The heating element includes at least two heating wires 30, and the projections of different heating wires 30 do not overlap or partially overlap along the first direction. Each insulating support plate 13 has at least two positioning grooves 131, and all heating wires 30 are respectively inserted into different positioning grooves 131.

[0085] Understandably, the air inlet side of the heating element is used for receiving air, and the air outlet side is used for discharging air, with the heating wire 30 located between the air inlet side and the air outlet side. Accordingly, the airflow passes through the heating element in a first direction and completes heating between the air inlet side and the air outlet side.

[0086] The projections formed by different heating wires 30 along the first direction do not overlap or only partially overlap, that is, the projections formed by different heating wires 30 along the first direction do not completely overlap. Correspondingly, each insulating support piece 13 corresponds to the positioning groove 131 of each heating wire 30, and the projections of different positioning grooves 131 along the first direction do not overlap.

[0087] Thus, the windward surfaces formed by the different heating wires 30 do not completely overlap, and are at least partially misaligned with each other on a plane perpendicular to the first direction. The windward area formed by all the heating wires 30 is larger, which is beneficial for fully heating the target and improving heating efficiency.

[0088] Furthermore, all the heating wires 30 are spaced apart in the first direction.

[0089] In this way, in addition to being at least partially misaligned with each other on a plane perpendicular to the first direction, the different heating wires 30 are also spaced apart from each other in the first direction, which helps to reduce the probability of contact between the different heating wires 30.

[0090] Furthermore, the groove depth direction of the positioning groove 131 intersects with the first direction, and the groove depth of each positioning groove 131 of each insulating support piece 13 is different from each other.

[0091] In this way, by inserting different heating wires 30 into the bottom of the corresponding positioning grooves 131, the effect of at least partially misaligning different heating wires 30 on the plane perpendicular to the first direction is achieved, and the projections of different heating wires 30 do not overlap or partially overlap along the first direction.

[0092] In some embodiments, the heating component includes at least two heating groups, each heating group including at least one heating wire 30. All heating groups are connected in parallel and configured to operate independently of each other.

[0093] Understandably, the power of each heating element can be the same or different. In one embodiment, the heating component includes two heating elements, each including a heating wire 30, and the heating wires 30 have the same power.

[0094] In this way, the heating element can control the operation of each heating group according to the required power. When low-power heating is required, some or one group of heating groups will operate; when maximum power heating is required, all heating groups will operate simultaneously.

[0095] Please refer to the following: Figures 7 to 9 In some embodiments, the heating element further includes a thermostat 50, which is disposed on the base 10 and electrically connected to the heating wire 30.

[0096] Understandably, the thermostat 50 can detect the ambient air temperature and control the heating element 30 accordingly. Specifically, when the detected temperature is higher than the set value, the thermostat 50 trips to disconnect the circuit, and the heating element 30 stops working, thus achieving the goal of keeping the hot air at the set temperature.

[0097] In this way, the heating element limits the operating temperature of the air heated by the heating element through the thermostat 50, preventing the support body 11 from deforming, melting, or even burning due to excessive temperature. In addition, temperature control can also prevent problems such as excessive temperature and oxidation of the heating wire 30, which can lead to reduced lifespan of the heating wire 30, increased resistance, or decreased power.

[0098] Furthermore, the heating element also includes a mounting clip 70, which is located on the support body 11, and the thermostat 50 is engaged with the mounting clip 70.

[0099] In this way, the thermostat 50 can be quickly installed by engaging with the mounting clip 70 without the need for screws.

[0100] Specifically, the heating element includes two mounting clips 70 and is located on the second support 113. The thermostat 50 is fixed by the two mounting clips 70, achieving screwless assembly.

[0101] Furthermore, the heating wire 30 and the thermostat 50 are respectively located on both sides of the support body 11; the support body 11 has a detection vent 117, and the thermostat 50 is set corresponding to the detection vent 117.

[0102] In this way, the hot air on one side of the heating wire 30 can pass through the detection vent 117 and act on the thermostat 50, so that the thermostat 50 can more accurately sense the temperature of the air heated by the heating wire 30.

[0103] The heating component mentioned above includes a base 10 and a heating wire 30. The base 10 includes a support 11 and an insulating support sheet 13, and the heating wire 30 is supported on the support 11 by the insulating support sheet 13.

[0104] The insulating support sheet 13 has two U-shaped grooves as first concave-convex structures 133, and the support body 11 has two corresponding second concave-convex structures 115, which are assembled with the support body 11 through a snap-fit ​​connection. Specifically, the insulating support sheet 13 has two first concave-convex structures 133, and the support body 11 has two corresponding second concave-convex structures 115. There is a certain distance between the two first concave-convex structures 133, which is not less than 8mm, so as to meet a certain stress stability after assembly.

[0105] The insulating support plate 13 also has two U-shaped grooves as positioning grooves 131 to fix the heating wire 30 in place. The insulating support plate 13 has certain strength and thickness requirements for the material, and its thickness can be in the range of 0.3mm-3.0mm. The material can be, but is not limited to, mica, ceramic, etc.

[0106] The heating wire 30 is a resistive heating element, fixed to the insulating support plate 13 via a positioning groove 131, and connected to a power source at both ends via terminals. Specifically, the heating wire 30 can adopt a spring-type or small-corrugated structure, with one section of the spring engaging the U-shaped groove to prevent the heating wire 30 from shifting, thereby preventing short circuits between turns caused by the shifting heating wire 30, and further reducing the risk of high temperatures or even fires due to variations in heating power. The insulating support plate 13 is fixed between the first support body 111 and the second support body 113, and is radially distributed. After assembly, the insulating support plate 13 is constrained by both supports, making it difficult for it to detach.

[0107] The heating element also includes a thermostat 50, which limits the operating temperature of the air heated by the heating element, preventing the support body 11 from deforming, melting, or even burning due to excessive temperature. The thermostat 50 is mounted on the second support body 113 and secured by two mounting clips 70, achieving screwless assembly. Furthermore, the second support body 113 has a detection vent 117, through which hot air can pass and act on the thermostat 50. The thermostat 50 senses the temperature of the flowing air and, when the temperature is too high, trips to disconnect the circuit, ensuring the hot air does not reach the set temperature.

[0108] The support body 11 has a near-ring-like structure, with the first support body 111 as the outer ring and the second support body 113 as the inner ring. An insulating support sheet 13 is located between and connected to the first and second support bodies 111 and 113. A spring-shaped heating wire 30 is mounted on the insulating support sheet 13. When energized, the heating wire 30 generates heat, allowing gas to exchange heat and increase its temperature. The first and second support bodies 111 and 113 are made of high-temperature resistant material, with the high-temperature resistant insulating support sheet 13 positioned between them. The insulating support sheet 13 is in direct contact with and supports the heating wire 30. The insulating support sheet 13 is radially distributed between the first and second support bodies 111 and 113, and can be uniformly or unevenly arranged, as long as it can stably support the high-temperature heating wire 30 at different positions.

[0109] The heating element may include two heating wires 30 connected in parallel, each with a power of 1000W. For low-power heating, only one heating wire 30 is heated; for high-power heating, both heating wires 30 are heated simultaneously. The heating wires 30 are staggered in the airflow direction to increase the airflow area, thereby improving the heat exchange rate and increasing the heating power.

[0110] Please refer to the following: Figure 10 and Figure 11 This application also provides an electric heater 200, which includes the heating element described above.

[0111] In the aforementioned electric heater 200, the heating element utilizes an insulating support plate 13 to engage with the heating wire 30 via a positioning groove 131, thereby supporting and positioning the heating wire 30 on the support body 11. In this way, the movement of the heating wire 30 is restricted by the insulating support plate 13, reducing the probability of misalignment and consequently reducing the likelihood of inter-turn short circuits. This further reduces the probability of problems such as high temperatures or even fires caused by variations in heating power. Furthermore, because the heating element uses the heating wire 30 as the heating source, the heating element also has advantages such as high average power during heating, rapid temperature rise, small size, and no starting inrush current.

[0112] In some embodiments, the electric heater 200 includes a housing 210, and a heating element is disposed within the housing 210. The housing 210 has an air outlet 211, which is annular or fan-shaped, and a mounting portion is provided corresponding to the air outlet 211.

[0113] Thus, the air outlet 211 disperses the air more widely, and with the same air outlet area, the annular or fan-shaped air outlet 211 can cover a larger area. In addition, the insulating support plate 13 supports the heating wire 30 in a corresponding manner with the air outlet 211, so that the airflow blown outward through the air outlet 211 can be evenly heated by the heating wire 30.

[0114] Furthermore, the insulating support sheet 13 also has a third concave-convex structure 135, and the outer shell 210 has a fourth concave-convex structure, wherein the third concave-convex structure 135 and the fourth concave-convex structure are configured to engage with each other.

[0115] Thus, after the outer casing 210 is installed, the fourth concave-convex structure cooperates with the third concave-convex structure 135 to completely fix the insulating support piece 13 onto the support body 11.

[0116] Furthermore, the electric heater 200 also includes a fan, which is located inside the housing and is used to drive airflow to be blown out from the air outlet 211 after passing through the heating element.

[0117] The aforementioned electric heater 200 employs a fan for forced convection and has an air duct 270 for air delivery. The fan motor 230 and fan blades 250 are located at the cold end of the air duct 270, while the heating element is located at the hot end of the air duct 270. Thus, the motor 230 drives the fan blades 250 to rotate, driving airflow (airflow direction as shown in the image). Figure 11 (As shown by the middle arrow) The air enters the air duct 270 through the cold end inlet 213, flows along the air duct 270 to the heating element, completes heat exchange, the temperature of the flowing air rises, and is blown out through the outlet 211.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0119] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A heating element, characterized in that, The heating component includes: The substrate (10) includes a support (11) and at least two insulating support sheets (13), each of the insulating support sheets (13) having a positioning groove (131), and all the insulating support sheets (13) being spaced apart from the support (11); and Heating wire (30) is disposed in the substrate (10) and is inserted into the positioning groove (131) of each of the insulating support sheets (13) and is supported by the insulating support sheets (13).

2. The heating component according to claim 1, characterized in that, The support body (11) includes a first support body (111) and a second support body (113), the first support body (111) and the second support body (113) being spaced apart; the insulating support sheet (13) is disposed between the first support body (111) and the second support body (113), and the opening of the positioning groove (131) faces the first support body (111) or the second support body (113).

3. The heating component according to claim 1 or 2, characterized in that, The support (11) extends at least partially along the first arc; All the insulating support pieces (13) are spaced apart along the extension direction of the support body (11), and the slots of the positioning grooves (131) of each insulating support piece (13) are configured to face away from the center of the first arc.

4. The heating component according to claim 1, characterized in that, The heating component also includes a thermostat (50), which is located on the substrate (10) and electrically connected to the heating wire (30).

5. The heating component according to claim 4, characterized in that, The heating element also includes a mounting clip (70), which is disposed on the support body (11), and the thermostat (50) is engaged with the mounting clip (70); And / or, the heating wire (30) and the temperature controller (50) are respectively disposed on both sides of the support (11); the support (11) has a detection vent (117), and the temperature controller (50) is disposed corresponding to the detection vent (117).

6. The heating component according to claim 1, characterized in that, The heating element has an air inlet side and an air outlet side arranged opposite to each other in a first direction; The heating component includes at least two heating wires (30), and along the first direction, the projections of different heating wires (30) do not overlap or partially overlap; Each of the insulating support sheets (13) has at least two positioning grooves (131), and all the heating wires (30) are respectively inserted into different positioning grooves (131).

7. The heating element according to claim 6, characterized in that, All of the heating wires (30) are spaced apart in the first direction; And / or, the groove depth direction of the positioning groove (131) intersects with the first direction, and the groove depth of each positioning groove (131) of each insulating support piece (13) is different from each other.

8. The heating component according to any one of claims 1 or 4-6, characterized in that, The heating component includes at least two heating groups, and each heating group includes at least one heating wire (30). All of the heating elements are connected in parallel and configured to operate independently of each other.

9. The heating component according to claim 1, characterized in that, The insulating support sheet (13) has a first snap-fit ​​structure, and the support body (11) has a second snap-fit ​​structure. The first snap-fit ​​structure and the second snap-fit ​​structure are configured to snap-fit ​​into each other.

10. The heating component according to claim 9, characterized in that, The first snap-fit ​​structure is a first concave-convex structure (133), and the second snap-fit ​​structure is a second concave-convex structure (115). The first concave-convex structure (133) and the second concave-convex structure (115) are configured to engage with each other. The insulating support sheet (13) engages with the support body (11) through the first concave-convex structure (133) and the second concave-convex structure (115).

11. The heating component according to claim 10, characterized in that, The insulating support sheet (13) has two first concave-convex structures (133), and the support body (11) has two second concave-convex structures (115). The two first concave-convex structures (133) correspond one-to-one with the two second concave-convex structures (115), and the two first concave-convex structures (133) are spaced apart.

12. An electric heater, characterized in that, Includes the heating element as described in any one of claims 1-10.

13. The electric heater according to claim 12, characterized in that, The electric heater includes a housing (210), and the heating element is disposed inside the housing (210); The outer casing (210) has an air outlet (211), and the air outlet (211) is annular or fan-shaped; The support (11) includes a mounting part, which is annular or fan-shaped and is arranged corresponding to the air outlet (211). The heating wire (30) is located in the mounting part. Each of the insulating support pieces (13) is disposed radially on the mounting portion, and all the insulating support pieces (13) are spaced apart from each other in the circumferential direction of the mounting portion.

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