Efficient PTC heater
By designing heat-conducting strips and heat dissipation fins in the PTC heater, the contact area and airflow path are increased, solving the problems of poor heat conduction and thermal expansion deformation, thus achieving efficient heating and extended lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIAXING AIJIA ELECTRICAL TECH CO LTD
- Filing Date
- 2025-04-22
- Publication Date
- 2026-05-05
AI Technical Summary
In existing PTC heaters, the contact area between the heat sink and the heating base is small, resulting in poor heat conduction and limited heating effect. Furthermore, PTC ceramics are prone to thermal expansion and deformation under prolonged high temperatures, affecting their service life.
The heat-conducting strip is designed to be formed by a heat-conducting metal plate, with heat dissipation fins inside. The fins have convection grooves and outward-curving blades, forming staggered ventilation channels to increase the contact area and airflow path, and prevent thermal expansion deformation.
It improves heating stability and efficiency, reduces wind noise, and extends the service life of the heater.
Smart Images
Figure CN224201881U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heater technology, specifically to a high-efficiency PTC heater. Background Technology
[0002] PTC heaters use PTC ceramic as the core heating element. When the heat generated by the PTC ceramic is dissipated through the heater, the temperature of the PTC ceramic itself decreases. Due to the positive temperature coefficient thermistor effect of PTC ceramic, its resistance decreases accordingly, increasing the current flowing through it, thus increasing the heat generated and raising its temperature. Compared with traditional heating devices such as heating wires, heating tubes, and far-infrared quartz heaters, PTC heaters offer advantages such as automatic temperature control, a wide operating voltage range, no open flame, safety, reliability, and long lifespan. Currently, PTC heaters are widely used in household appliances such as air conditioner auxiliary heating, fan heaters, and bathroom heaters, and also have mature applications in automotive defrosting, heating, and battery heating.
[0003] Taking a PTC air heater as an example, the heat generated by the PTC ceramic is dissipated through the heat dissipation strips that are bonded and in contact with it. However, in the existing technology, the contact area between the heat dissipation fins on the heat dissipation strips and the heating base is small, resulting in poor heat conduction and limiting the heating effect of the heater. Furthermore, because the PTC ceramic is in a high-temperature state for a long time, the PTC ceramic sheet undergoes large thermal expansion deformation, which further affects the contact heat transfer of the heating base and may even cause the PTC ceramic sheet to delaminate and loosen from the heat dissipation strip, affecting normal operation and greatly reducing its service life. Therefore, it is necessary to design a high-efficiency PTC heater to overcome the above-mentioned heat conduction problems. Utility Model Content
[0004] This utility model discloses a high-efficiency PTC heater, comprising a PTC heating element, a heat-conducting strip, and heat dissipation fins. The heat-conducting strip is formed by enclosing a heat-conducting metal plate and has a cavity that runs horizontally through both sides. Several heat dissipation fins are arranged inside the cavity of the heat-conducting strip. The upper and lower ends of the heat dissipation fins are connected to the inner cavity surface of the heat-conducting strip. The several heat dissipation fins are arranged at intervals to divide the cavity of the heat-conducting strip into several air ducts that run through both sides of the heat-conducting strip. Several convection grooves connecting the air ducts on both sides of the heat dissipation fin are formed on each heat dissipation fin. The heat-conducting strip is attached to at least one side of the PTC heating element to conduct heat to the heat-conducting strip.
[0005] As a further improvement of this utility model, the length extension direction of the convection groove is parallel to the extension direction of the two side edges of the heat dissipation fins.
[0006] As a further improvement of this utility model, the two sides of the convection channel along the length direction are respectively provided with outward-curved blades on the opposite side of the heat dissipation fins, and the outward-curved ends of the blades extend toward the opposite side edge of the convection channel.
[0007] As a further improvement of this utility model, the cross-sectional shape of the blade is arc-shaped, and the blade and the surface of the heat dissipation fins form an arc-shaped semi-enclosed structure.
[0008] As a further improvement of this utility model, the heat dissipation fins are integrally bent from a heat-conducting metal plate, and the upper and lower ends of each heat dissipation fin are respectively connected to the ends of adjacent heat dissipation fins on opposite sides.
[0009] As a further improvement of this utility model, the end of the heat dissipation fin connected to the adjacent side is provided with an end plane, and the end plane is in contact with the inner cavity surface of the heat conduction strip.
[0010] As a further improvement of this utility model, heat-conducting strips are provided on both the upper and lower planes of the PTC heating element, and the two planes are attached and connected.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0012] 1. The end of the heat dissipation fins connected to the adjacent side of this utility model is provided with an end plane, which increases the contact area between the heat dissipation fins and the heating base surface, greatly improves the speed and efficiency of heat transfer from the heating base surface to the heat dissipation fins, and improves the heating stability of the heater.
[0013] Second, this utility model has several convection grooves on each heat dissipation fin and blades extending outward to the opposite side on both sides of the convection grooves, which transforms the original straight air duct formed by the heat dissipation fins into an intersecting and interconnected air duct form, increasing the path and time of air flow through the heat dissipation fins, so that the air can be fully heated and the heating efficiency of the heater is improved.
[0014] Third, the blades on both sides of the convection channel of this utility model have an arc-shaped cross section, which forms an arc-shaped semi-enclosed structure with the surface of the heat dissipation fins. When air flows through, it can reduce the resistance to passage, allowing the airflow to pass through in a smoother manner and preventing wind noise caused by obstructing the airflow.
[0015] Fourth, the heat-conducting strip of this utility model can efficiently transfer the generated heat by adhering to the PTC heating element, preventing the PTC element from being damaged due to large thermal expansion deformation caused by poor heat dissipation, thus ensuring the service life of the heater. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the heater of this utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the heater of this utility model, in which the PTC heating element and the heat-conducting strip are separated;
[0018] Figure 3 This is a schematic diagram of the structure of the heat dissipation fins and heat dissipation plates of this utility model;
[0019] Figure 4 A schematic diagram of the air duct formed by the heat dissipation fins of this utility model;
[0020] Figure 5 These are three views of the heat dissipation fins of this utility model;
[0021] 1. PTC heating element; 2. Heat-conducting strip; 201. Air duct; 3. Heat dissipation fins; 301. Heat dissipation fins; 3011. Convection groove; 3012. End plane; 3013. Blade. Detailed Implementation
[0022] To better understand the purpose, structure, and function of this utility model, a more detailed description of the utility model is provided below in conjunction with the accompanying drawings. In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "horizontal," and "vertical" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0023] For specific implementation examples, please refer to the appendix. Figure 1 - Appendix Figure 5
[0024] A high-efficiency PTC heater includes a PTC heating element 1, a heat-conducting strip 2, and heat dissipation fins 3.
[0025] like Figure 1 and Figure 2 As shown, the heat-conducting strip 2 is made of strip-shaped heat-conducting aluminum strips forming a rectangular frame, with a through cavity inside. Heat dissipation fins 3 are fixedly installed in the internal cavity of the heat-conducting strip 2. Plate-shaped PTC heating elements 1 are arranged at intervals between two parallel heat-conducting strips 2. The upper and lower surfaces of the PTC heating elements 1 are bonded to the planes of the upper and lower heat-conducting strips 2 with silicone to conduct heat to the heat-conducting strips 2.
[0026] like Figure 3 and Figure 4 As shown, the heat dissipation fins 3 inside the heat-conducting strip 2 are formed by extruding and bending aluminum strips through a mold. The extruded heat dissipation fins 3 have a regular wavy structure. On both sides of each peak or trough of the wavy structure, two symmetrical heat dissipation fins 301 are formed. Figure 3 Enlarged structure in the lower right corner and Figure 5 (Structure shown in the three-view diagram) The length b of a single heat dissipation fin 301 is equal to the vertical height of the heat conduction strip 2, and the width a of a single heat dissipation fin 301 is greater than the vertical width between the two side walls of the inner cavity of the heat conduction strip. Two sides of length b on each heat dissipation fin 301 are connected to the sides of adjacent heat dissipation fins 301 of length b on opposite sides, and the connected portions of the two sides form an end plane 3012 parallel to the side wall of the heat conduction strip 2. Figure 3 The vertical wall structure indicated by the dashed box area) has its end plane 3012 surface bonded to the inner wall of the heat-conducting strip 2 by brazing.
[0027] As described above, the two heat dissipation fins 301 and an end plane 3012 together form a trapezoidal structure. The through cavity in the heat conduction strip 2 is divided into a trapezoidal through air duct 201 by the aforementioned trapezoidal structure (e.g., Figure 4 The trapezoidal area (selected by the dashed line) is used to allow airflow to pass through.
[0028] Heating principle: When the heater heats up, the heat generated by the PTC heating element 1 is conducted to the plane of the heat-conducting strip 2 that is attached to it. The conducted heat is then conducted to the heat dissipation fins 301 through the end plane 3012 that is attached to the inner wall of the heat-conducting strip 2. When the airflow flows through the air guide duct 201 formed by the heat dissipation fins 301 and the end plane 3012, it will be heated up to achieve the heating effect.
[0029] Furthermore, the surface of the heat dissipation fin 301 is provided with convection grooves 3011 that penetrate and connect both sides of the heat dissipation fin 301 along the width a direction. Figure 3 (The through structure indicated by the dashed box area), such as Figure 5 As shown in the half-section top view below, each heat dissipation fin 301 has two sets of symmetrical convection slots 3011, and each set of convection slots 3011 contains 6 evenly spaced convection slots 3011.
[0030] Furthermore, on both sides of the convection channel 3011 parallel to the length a of the heat dissipation fin 301, outwardly flared blades 3013 are respectively formed on the opposite side of the heat dissipation fin 301. The cross-section of the blades 3013 is as shown in the figure. Figure 5 As shown in the half-section top view below, the blade 3013 is arc-shaped, with the outward-curved end extending toward the opposite side edge of the convection slot 3011. The two ends of the blade 3013 are connected to the surface of the heat dissipation fin 301 in an arc-shaped semi-encircling manner, forming a curved air duct passage connecting both sides of the heat dissipation fin 301.
[0031] Heating principle: such as Figure 5As shown in the half-section top view below, the airflow that originally passed directly through the air guide duct 201 will, when flowing through the heat dissipation fins with convection slots 3011 and blades 3013, partially divert some of the airflow. Figure 5 The path shown by the dashed line passes from one side of the heat dissipation fin 301 to the other side. During this process, the airflow path and time increase, allowing it to be heated more fully and carrying away more heat from the surface of the heat dissipation fin 301, thus improving the heating efficiency of the heater.
[0032] The above description is only a preferred embodiment of the present utility model and is intended to illustrate the principle and effect of the present utility model, and is not intended to limit the present utility model. All variations, modifications and substitutions within the spirit and principle of the present design are within the protection scope of the present utility model.
Claims
1. A high-efficiency PTC heater, characterized in that: It includes a PTC heating element (1), a heat-conducting strip (2), and heat dissipation fins (301); The heat-conducting strip (2) is formed by enclosing a heat-conducting metal plate and has a cavity that runs horizontally through both sides. Several heat dissipation fins (301) are arranged inside the cavity of the heat-conducting strip (2). The upper and lower ends of the heat dissipation fins (301) are connected to the inner cavity surface of the heat-conducting strip (2). The heat dissipation fins (301) are arranged at intervals to divide the cavity of the heat-conducting strip (2) into several air ducts (201) that run through both sides of the heat-conducting strip (2). Each heat dissipation fin (301) has several convection slots (3011) that connect the air guide channels (201) on both sides of the heat dissipation fin (301). A heat-conducting strip (2) is attached to at least one side of the PTC heating element (1) to conduct heat to the heat-conducting strip (2).
2. The high-efficiency PTC heater according to claim 1, characterized in that: The length extension direction of the convection groove (3011) is parallel to the extension direction of the two sides of the heat dissipation fin (301).
3. The high-efficiency PTC heater according to claim 2, characterized in that: Along the length direction of the convection channel (3011), there are outward-curved blades (3013) on both sides of the heat dissipation fins (301), and the outward-curved ends of the blades (3013) extend toward the opposite side edge of the convection channel (3011).
4. A high-efficiency PTC heater according to claim 3, characterized in that: The blade (3013) has a circular arc shape in cross section, and the blade (3013) and the surface of the heat dissipation fin (301) form a circular arc semi-enclosed structure.
5. A high-efficiency PTC heater according to claim 1, characterized in that: The heat dissipation fins (301) are integrally bent from a heat-conducting metal plate, and the upper and lower ends of each heat dissipation fin (301) are respectively connected to the ends of adjacent heat dissipation fins (301) on the opposite side.
6. A high-efficiency PTC heater according to claim 5, characterized in that: The end of the heat dissipation fin (301) connected to the adjacent side is provided with an end plane (3012), and the end plane (3012) is attached to the inner cavity surface of the heat conduction strip (2).
7. A high-efficiency PTC heater according to claim 1, characterized in that: The upper and lower planes of the PTC heating element (1) are provided with heat-conducting strips (2), and the two planes are connected in close contact.