Novel PTC (Positive Temperature Coefficient) heater in multi-group connection

Abstract

The utility model discloses a multi-group connected novel PTC heater, each group of PTC heater comprises a PTC heating assembly, metal heat-conducting fins fixed on two sides of the PTC heating assembly, and a radiator arranged on the outer surface of the metal heat-conducting fins, the two groups of PTC heaters are fixedly connected through a metal connecting sheet, the radiator comprises a plurality of radiating fins arranged at equal intervals, and the radiating fins are arranged on the outer surface of the metal heat-conducting fins. The adjacent radiating fins are connected in a clamping manner; the radiating fins far away from one side of the metal connecting sheet are connected and fixed with the metal heat-conducting sheet sliding grooves, and the radiating fins close to one side of the metal connecting sheet are respectively connected and fixed with the metal heat-conducting sheet and the metal connecting sheet sliding grooves. According to the novel PTC heater connected in multiple groups, a traditional gluing mode or a lead welding mode for fixing is changed, no pollution exists in air during heat exchange, and the problem of uncontrollable falling is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of PTC heaters, and in particular to a novel PTC heater with multiple interconnected units. Background Technology

[0002] PTC electric heaters have a wide range of applications, particularly in air conditioner indoor units. Currently, the most commonly used PTC heaters on the market have corrugated aluminum heat sinks.

[0003] PTC electric heaters are available in single-unit and multi-unit versions. A single-unit PTC heater includes a PTC heating element, metal heat-conducting plates fixed on both sides of the PTC heating element, and a heat sink located on the outer surface of the metal heat-conducting plates.

[0004] To facilitate assembly, these PTC heaters with two or more sets are fixed by bonding the radiator to the aluminum sheet with adhesive or by lead soldering when connecting the two sets of PTC heaters. However, this method is prone to delamination or falling off, resulting in a low safety factor. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a new type of PTC heater with multiple interconnected units to avoid delamination or detachment and improve the product safety factor.

[0006] The above-mentioned utility model objective is achieved through the following technical solution: a novel PTC heater with multiple interconnected groups, each group of PTC heaters including a PTC heating element, metal heat-conducting plates fixed on both sides of the PTC heating element, and a radiator disposed on the outer surface of the metal heat-conducting plates. Two groups of PTC heaters are fixedly connected by a metal connecting piece. The radiator includes a plurality of heat-conducting plates arranged at equal intervals, and adjacent heat-conducting plates are engaged and connected. The heat-conducting plates on the side away from the metal connecting piece are connected and fixed to the metal heat-conducting plate groove, and the heat-conducting plates on the side closer to the metal connecting piece are connected and fixed to the metal heat-conducting plate and the metal connecting piece groove, respectively.

[0007] By adopting the above technical solution, the heat sink on the side away from the metal connecting piece is connected and fixed to the metal heat-conducting plate groove, while the heat sink on the side closer to the metal connecting piece is connected and fixed to both the metal heat-conducting plate and the metal connecting piece groove. This connection and fixing method changes the traditional adhesive or lead soldering method, ensuring no air pollution during heat exchange and avoiding uncontrollable detachment. Simultaneously, the heat sinks are connected by a snap-fit ​​method, which facilitates processing and reduces processing costs. Furthermore, the snap-fit ​​method allows for high-precision control of the spacing between adjacent heat sinks, resulting in low wind resistance, high heat exchange efficiency, and reduced airflow noise.

[0008] The present invention is further configured such that: each heat sink includes a sheet-like body, the two long edges of the sheet-like body are bent to the same side to form a folded edge, and each folded edge is provided with at least one latch, and a locking hole matching the size of the latch is provided below the latch; the latches of each adjacent heat sink are engaged with the locking holes.

[0009] The present invention is further configured such that: the two ends of one fold of the heat sink on the side away from the metal connecting piece extend outward to form pins, and the two ends of the two folds of the heat sink on the side close to the metal connecting piece extend outward to form pins; the metal connecting piece has slots on both sides corresponding to the pins, and the metal heat-conducting sheet has slots on the side facing the heat sink corresponding to the pins; each pin is snapped into the slot and then pressed and fixed.

[0010] The present invention is further configured such that each heat sink has at least one reinforcing rib on its sheet-like body.

[0011] By adopting the above technical solution, the strength of each heat sink can be enhanced by setting reinforcing ribs, preventing deformation under external forces.

[0012] The present invention is further configured such that a through window is provided in the reinforcing rib, the window being smaller than the length and width of the reinforcing rib.

[0013] By adopting the above technical solution, the reinforcing ribs can be strengthened without damaging them, while also increasing airflow and improving heat dissipation.

[0014] The present invention is further configured such that each of the latches is a U-shaped block that protrudes upward and bends along each of the folded edges.

[0015] The present invention is further configured such that thermally conductive silicone or thermally conductive grease is filled between each of the pins (5) and the slot (6).

[0016] In summary, the beneficial technical effects of this utility model are as follows:

[0017] The heat sink on the side furthest from the metal connecting piece is connected and fixed to the metal heat-conducting plate groove. The heat sink on the side closest to the metal connecting piece is connected and fixed to both the metal heat-conducting plate and the metal connecting piece groove. This connection and fixing method changes the traditional adhesive or lead soldering method, eliminates air pollution during heat exchange, and avoids uncontrollable detachment problems. Attached Figure Description

[0018] Figure 1 This is an exploded view of this utility model;

[0019] Figure 2 This is a schematic diagram of the heat sink structure;

[0020] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0021] In the figure, 1. PTC heating element; 2. Metal heat-conducting plate; 3. Heat sink; 31. Heat sink; 311. Plate-shaped body; 312. Folded edge; 313. Locking buckle; 314. Locking hole; 4. Metal connecting piece; 5. Pin; 6. Slot; 7. Reinforcing rib; 8. Window; 9. Anti-bending pressure rib. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Reference Figure 1 , Figure 3 This utility model discloses a novel PTC heater with multiple interconnected groups. Each PTC heater group includes a PTC heating element 1, metal heat-conducting plates 2 fixed on both sides of the PTC heating element, and a radiator 3 disposed on the outer surface of the metal heat-conducting plates 2. Two PTC heater groups are fixedly connected by metal connecting plates 4. The radiator 3 includes a number of heat dissipation fins 31 arranged at equal intervals, and adjacent heat dissipation fins 31 are engaged and connected. The heat dissipation fins 31 on the side away from the metal connecting plate 4 are connected and fixed to the sliding groove of the metal heat-conducting plate 2, and the heat dissipation fins 31 on the side closer to the metal connecting plate 4 are connected and fixed to the metal heat-conducting plate 2 and the sliding groove of the metal connecting plate 4, respectively.

[0024] This connection and fixing method changes the traditional adhesive or lead soldering method, ensuring no air pollution during heat exchange and avoiding uncontrollable detachment. At the same time, the heat sinks 31 are connected by a snap-fit ​​method, which facilitates processing and reduces processing costs. Furthermore, the spacing between adjacent heat sinks 31 after snap-fit ​​is achieved with high precision, resulting in low wind resistance, high heat exchange efficiency, and reduced airflow noise.

[0025] refer to Figure 2 As shown, each heat sink 31 includes a sheet-like body 311. The two long edges of the sheet-like body 311 are bent to the same side to form a folded edge 312. Each folded edge 312 has at least one latch 313 on its edge. In this embodiment, there are two latches 313. Each latch 313 has a corresponding locking hole 314 below it that matches the size of the latch 313. The latch 313 is a U-shaped block that protrudes upward and bends along each folded edge 312. The latches 313 of each adjacent heat sink 31 are engaged with the locking holes 314, thus connecting each heat sink 31 into a whole to form a heat sink 3.

[0026] like Figure 1 and Figure 3The specific connection method is as follows: On the side of the heat sink 31 furthest from the metal connecting piece 4, both ends of one folded edge 312 extend outwards to form pins 5; on the side of the heat sink 31 closest to the metal connecting piece 4, both ends of the two folded edges extend outwards to form pins 5; the metal connecting piece 4 has slots 6 on both sides corresponding to the pins 5, and the metal heat-conducting sheet 2 has slots 6 corresponding to the pins 5 on the side facing the heat sink 3. Each pin 5 is inserted into the slot 6 and then pressed and fixed. Before pressing and fixing, thermally conductive silicone or thermally conductive grease is filled between the pins 5 and the slots 6 to improve thermal conductivity between the heat sink 31 and the metal heat-conducting sheet 2, and between the heat sink 31 and the metal connecting piece 4.

[0027] In this embodiment, the slot 6 is inclined on the surface of the metal connecting piece 4 and the metal heat-conducting sheet 2. The angle formed by the slot 6 is between 0° and 90°, preferably 45°. This provides sufficient space for the pins 5 of the heat sink 31 to pass through, making it easy for each pin 5 to be easily inserted into the slot 6. After the heat sink 31 is engaged with the locking hole 314, it forms a whole and is installed and fixed with the metal connecting piece 4 and the metal heat-conducting sheet 2. At this time, each pin 5 of the heat sink 31 extends out neatly and is inserted into the slot 6. Then, the slot 6 is evenly rolled by a crimping machine. At this time, the angle formed between the slot 6 and the metal connecting piece 4 and the metal heat-conducting sheet 2 is 0°. The slot 6 fits against each pin 5, thereby crimping and fixing each pin 5 in the slot 6, and finally achieving effective and reliable fixing of the heat sink 31 to the metal connecting piece 4 and the metal heat-conducting sheet 2.

[0028] like Figure 2 To enhance the strength of each heat sink 31 and prevent deformation under external forces, each heat sink 31 has at least one reinforcing rib 7 on its sheet-like body 311. In this embodiment, the reinforcing rib 7 is a single, elongated strip. Of course, the number of reinforcing ribs 7 is not limited to one in this embodiment and can be more. Similarly, a counter-reinforcing rib (not shown in the figure) parallel to and opposite to the reinforcing rib 7 can also be provided on the sheet-like body 311.

[0029] Meanwhile, anti-bending reinforcing ribs 9 are provided at both opening edges of the sheet-like body 311, which can effectively prevent deformation of its edges after being subjected to external forces. In this embodiment, the distance between the anti-bending reinforcing ribs 9 and the edges of the sheet-like body 311 is 1mm to 2mm.

[0030] like Figure 2 A through window 8 is provided in the reinforcing rib 7, and the window 8 is smaller than the length and width of the reinforcing rib 7. The window 8 is rectangular, and its length and width are both smaller than the length and width of the reinforcing rib 7. This way, the reinforcing rib 7 can be strengthened without damaging it, while the airflow can be enhanced and the heat dissipation can be improved. At the same time, an air guide plate (not shown in the figure) can be fixed along the long edge of the window 8. The air guide plate can be a rectangular plate with an angled shape or an arc shape.

[0031] In this embodiment, the multiple connected novel PTC heaters are straight strips. However, depending on the application scenario, the radiator 3, the metal heat-conducting plate 2, and the metal connecting plate 4 can be bent to make the product into an arc or ring shape.

[0032] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A novel PTC heater with multiple interconnected groups, each group of PTC heaters comprising a PTC heating element (1), metal heat-conducting plates (2) fixed to both sides of the PTC heating element, and a heat sink (3) disposed on the outer surface of the metal heat-conducting plates (2), wherein two groups of PTC heaters are fixedly connected by metal connecting plates (4), characterized in that: The radiator (3) includes several heat sinks (31) arranged at equal intervals, with adjacent heat sinks (31) being snapped together; the heat sinks (31) on the side away from the metal connecting piece (4) are connected and fixed to the sliding groove of the metal heat-conducting piece (2), and the heat sinks (31) on the side close to the metal connecting piece (4) are connected and fixed to the sliding groove of the metal heat-conducting piece (2) and the metal connecting piece (4) respectively.

2. The novel PTC heater with multiple interconnected units according to claim 1, characterized in that: Each heat sink (31) includes a sheet-like body (311), and the two long edges of the sheet-like body (311) are bent to the same side to form a folded edge (312). Each folded edge (312) has at least one latch (313) on its edge, and a locking hole (314) matching the size of the latch (313) is provided below the latch (313); the latches (313) of each adjacent heat sink (31) are engaged with the locking holes (314).

3. The novel PTC heater with multiple interconnected units according to claim 2, characterized in that: One end of one of the folded edges (312) of the heat sink (31) on the side away from the metal connecting piece (4) extends outward to form pins (5), and the two ends of the two folded edges of the heat sink (31) on the side close to the metal connecting piece (4) also extend outward to form pins (5); the metal connecting piece (4) has slots (6) on both sides corresponding to the pins (5), and the metal heat-conducting sheet (2) on the side facing the heat sink (3) has slots (6) corresponding to the pins (5). Each pin (5) is inserted into the slot (6) and then pressed and fixed.

4. The novel PTC heater with multiple interconnected units according to claim 2, characterized in that: Each heat sink (31) has at least one reinforcing rib (7) on its sheet-like body (311).

5. The novel PTC heater with multiple interconnected units according to claim 4, characterized in that: A through window (8) is provided in the reinforcing rib (7), and the window (8) is smaller than the length and width of the reinforcing rib (7).

6. The novel PTC heater with multiple interconnected units according to claim 2, characterized in that: Each of the latches (313) is a U-shaped block that protrudes upward and bends along each of the folded edges (312).

7. The novel PTC heater with multiple interconnected units according to claim 3, characterized in that: The space between each pin (5) and the slot (6) is filled with thermally conductive silicone or thermally conductive grease.

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