Partitioned heating PTC (Positive Temperature Coefficient) heating rod and PTC heater

Abstract

The utility model relates to the technical field of PTC heating, and specifically relates to a PTC heating rod and a PTC heater for zone heating, the PTC heating rod comprises a heating structure, the heating structure comprises a common terminal electrode slice, two ends of the common terminal electrode slice are respectively provided with a first ceramic chip and a second ceramic chip, and the first ceramic chip and the second ceramic chip are respectively connected with the common terminal electrode slice. The space between the first ceramic plate and the second ceramic plate is divided by a plurality of third ceramic plates to form a plurality of heating subareas which are sequentially arranged at intervals, each heating subarea is provided with at least one PTC heating chip, and a subarea electrode plate is arranged above the PTC heating chip of each heating subarea. According to the utility model, the PTC heating chip in the PTC heating rod is divided into a plurality of heating subareas through the ceramic chips, and each heating subarea is respectively provided with the subarea electrode slice which is matched with the common end electrode slice, so that a subarea heating function is realized, the structure is simple, the possibility of deformation is low, a plastic frame and a ceramic substrate are not needed, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of PTC heating technology, specifically to a PTC heating rod and PTC heater with zoned heating. Background Technology

[0002] New energy vehicles, driven by energy conservation needs, require different heating outputs from the air conditioning system for the driver, front passenger, and rear seats. Existing PTC heating rods use injection-molded electrode sheets for zoned heating. These electrode sheets are injection-molded within a plastic frame. Because the plastic frame encloses the electrode sheets, a ceramic substrate must be added outside the electrode sheets to ensure a seamless heat transfer path from the heating chip to the electrode sheets, then to the ceramic substrate, the insulating film, and finally the aluminum tube. This results in higher costs. Furthermore, the injection-molded electrode sheets require customized injection molds for heaters of different sizes, leading to poor versatility. Additionally, one side of the injection-molded electrode sheet only has the ceramic substrate, while the other side has the heating chip, the common electrode sheet, and the ceramic substrate. This results in inconsistent plastic thickness on both sides of the injection-molded electrode sheet, which can easily cause structural warping. Due to limitations in injection mold design, the internal cavity structure of injection-molded structures requires rounded corners. Therefore, parts placed inside the injection-molded electrode sheet need to be designed to be smaller or have rounded corners added simultaneously to ensure that the structure does not interfere with each other. This reduces space utilization and increases component costs. In addition, the operating temperature and voltage of the injection-molded electrode sheet are also strictly limited. The heat distortion temperature of commonly used high-temperature plastic particle materials is below 250°C, which limits the temperature of the PTC heating chip. Plastic particles are materials that can cause leakage and tracking. To avoid insulation failure between the common terminal electrode sheet and the injection-molded electrode sheet, the thickness of the heating chip needs to be increased as much as possible, leading to increased costs. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a PTC heating rod and PTC heater with zoned heating, which can at least solve some of the problems of the existing technology.

[0004] To achieve the above objectives, the technical solution of this utility model is a PTC heating rod with zoned heating, comprising a heating structure. The heating structure includes a common end electrode plate, and a first ceramic plate and a second ceramic plate are respectively disposed on both ends of the common end electrode plate. The first ceramic plate and the second ceramic plate are separated by a plurality of third ceramic plates to form a plurality of heating zones arranged sequentially at intervals. Each heating zone is provided with at least one PTC heating chip, and a zone electrode plate is disposed above the PTC heating chip of each heating zone.

[0005] As one embodiment, the pins of the common terminal electrode and the pins of each of the partition electrode plates extend to the same side of the heating structure.

[0006] As one implementation method, along the direction from the first ceramic sheet to the second ceramic sheet, the width of the PTC heating chip in the plurality of heating zones decreases sequentially.

[0007] As one embodiment, except for the partitioned electrode sheet near the second ceramic sheet, one side of the end of each of the other partitioned electrode sheets is bent downward to form a bent portion and connected to one end of the corresponding pin, and the other end of the pin extends from one side to the outside of the second ceramic sheet.

[0008] As one implementation method, the side of the bent portion away from the corresponding pin is provided with a bend-side slot.

[0009] As one embodiment, the top surfaces of the third ceramic sheet and the second ceramic sheet are respectively provided with a first pin slot and a second pin slot for the pins of the partition electrode sheet to pass through.

[0010] As one implementation method, in addition to the heating zone near the first ceramic plate, a fourth ceramic plate is also provided on one side of the PTC heating chip in each of the other heating zones. The top surfaces of the fourth ceramic plate, the third ceramic plate and the second ceramic plate are respectively provided with pin slots for the pins of the zone electrode plates to pass through.

[0011] As one embodiment, the thickness of the fourth ceramic sheet is between the thickness of the PTC heating chip and the sum of the thicknesses of the PTC heating chip and the partitioned electrode sheet.

[0012] As one embodiment, the PTC heating rod further includes an aluminum tube and an insulating film. The heating structure is covered with an insulating film and installed in the aluminum tube.

[0013] This utility model also provides a PTC heater, comprising at least one PTC heating rod as described in any one of the above.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) This utility model divides the PTC heating chip in the PTC heating rod into multiple heating zones by ceramic sheet, and sets a partition electrode sheet in each heating zone to cooperate with the common end electrode sheet, thereby realizing the partition heating function. The structure is simple, not easy to deform, and does not require plastic frame or ceramic substrate, so the cost is low.

[0016] (2) By combining different numbers of ceramic sheets and different numbers of PTC heating chips, this utility model can realize heating rods with zoned heating function in various specifications, thereby adapting to heaters of various sizes without the need for customized injection molds.

[0017] (3) The PTC heating rod of this utility model has a wide temperature range of -60℃ to 300℃ and can be used at voltages of 1200V and below, which can cover the high voltage power supply range of mainstream new energy vehicles on the market. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Exploded view of a PTC heating rod with zoned heating provided in an embodiment of this utility model;

[0020] Figure 2 A schematic diagram of the partitioned PTC heating rod for partitioned heating provided in an embodiment of this utility model;

[0021] Figure 3 An assembly diagram of a PTC heating rod with zoned heating provided for an embodiment of this utility model;

[0022] Figure 4 A partial detailed view of a PTC heating rod with zoned heating provided for an embodiment of this utility model;

[0023] In the diagram: 1. First zone electrode plate; 2. Second zone electrode plate; 3. Positioning rubber plug; 4. First PTC heating chip; 5. Second PTC heating chip; 6. First ceramic plate; 7. Second ceramic plate; 8. Third ceramic plate; 9. Fourth ceramic plate; 10. Common terminal electrode plate; 11. Insulating film; 12. Aluminum tube; 13. First heating zone; 14. Second heating zone; 15. Groove beside the bend; 16. Bending section; 17. Groove of the first pin; 18. Groove of the second pin; 19. Groove of the third pin; 20. First pin; 21. Second pin; 22. Third pin. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0026] The terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "several" means one or more, and "multiple" means two or more.

[0027] like Figures 1-4 As shown, this utility model embodiment provides a PTC heating rod with zoned heating, including a heating structure. The heating structure includes a common end electrode plate 10, and a first ceramic plate 6 and a second ceramic plate 7 are respectively disposed on both ends of the common end electrode plate 10. The first ceramic plate 6 and the second ceramic plate 7 are separated by a plurality of third ceramic plates 8 to form a plurality of heating zones arranged sequentially at intervals. Each heating zone is provided with at least one PTC heating chip, and a zone electrode plate is disposed above the PTC heating chip of each heating zone. This embodiment uses ceramic sheets to divide the PTC heating chip inside the PTC heating rod into multiple heating zones, and sets a zone electrode sheet in each heating zone to cooperate with the common terminal electrode sheet 10, thereby realizing the zone heating function. Its structure is simple, not easily deformed, and does not require plastic frames or ceramic substrates, resulting in low cost. By combining different numbers of ceramic sheets and different numbers of PTC heating chips, heating rods with zone heating function of various specifications can be realized, thus adapting to heaters of various sizes. There is no need to customize injection molds, and the temperature resistance of ceramic sheets can usually reach above 1000℃, which expands the temperature range of PTC heating chips that can be selected in this embodiment. At the same time, ceramic sheets do not produce leakage tracking phenomena in the use environment. In design and use, only creepage distance and electrical clearance need to be considered, reducing development difficulty and product size.

[0028] In this embodiment, the bottom surface of the PTC heating chip in each heating zone is in contact with the common terminal electrode 10, and the top surface is in contact with the corresponding zone electrode. In this embodiment, each zone electrode acts as the negative electrode of the corresponding heating zone, and the length of the common terminal electrode 10 covers all heating zones and acts as the positive electrode of all heating zones. When the heater is turned off, the positive electrode corresponding to the common terminal electrode 10 is still conductive, while the negative electrode corresponding to each zone electrode is turned off, and a circuit cannot be formed inside the PTC heating rod. When different heating requirements are met, the heater power relay or controller turns on the corresponding negative electrode; that is, when a certain heating zone needs to be turned on, the corresponding zone electrode is connected to the power circuit.

[0029] In an optimized embodiment, the pins of the common terminal electrode 10 and the pins of each of the partitioned electrode plates extend to the same side of the heating structure. Preferably, the pins of the common terminal electrode 10 and all of the partitioned electrode plates extend to the PTC heater power supply side to facilitate power connection and reduce the length and complexity of the connecting wires.

[0030] In some embodiments, the width of the PTC heating chips in the plurality of heating zones decreases sequentially along the direction from the first ceramic sheet 6 to the second ceramic sheet 7. In this embodiment, the width direction of the PTC heating chips is consistent with the width direction of the common terminal electrode sheet 10. By arranging the plurality of heating zones sequentially at intervals along the length direction of the common terminal electrode sheet 10, and decreasing the width of the PTC heating chips in the plurality of heating zones sequentially, not only can different heat generation be achieved in the plurality of heating zones, but it also facilitates the lead-out of the pins of all zone electrode sheets from the same side of the heating structure.

[0031] Furthermore, except for the partitioned electrode sheet near the second ceramic sheet 7, one side of the end of each of the other partitioned electrode sheets is bent downwards to form a bent portion 16, and connected to one end of the corresponding pin, the other end of the pin extending from one side to the outside of the second ceramic sheet 7. For example... Figure 1 As shown, the pins of the partitioned electrode plates near the second ceramic plate 7 are arranged horizontally and extend from the top surface of the second ceramic plate 7 to one side of the second ceramic plate 7; one side of the end of the other partitioned electrode plates is bent downward to form a bent portion 16 and connected to one end of the corresponding pin, so that the pins of the other partitioned electrode plates can be set on their sides and extend from one side of the other partitioned electrode plates to one side of the second ceramic plate 7. This not only makes efficient use of space and makes the heating structure more compact in the width direction, but also prevents the pins of the other partitioned electrode plates from protruding from the top surface of the partitioned electrode plates, avoiding the extra thickness caused by the protruding pins, and making the heating structure thinner in the thickness direction.

[0032] Furthermore, the bent portion 16 has a side slot 15 on the side opposite to the corresponding pin. For example... Figure 4As shown, by providing a bend-side slot 15 on the side of the partitioned electrode sheet near the end, it not only facilitates the formation of a bend 16 at the end of the partitioned electrode sheet, but also ensures sufficient insulation distance between the bend 16 and the side of the corresponding PTC heating chip, preventing the partitioned electrode sheet from short-circuiting to the common terminal electrode sheet 10 through the corresponding PTC heating chip; at the same time, the bend-side slot 15 ensures that bending during the processing of the partitioned electrode sheet will not affect the large surface of the partitioned electrode sheet, ensuring the stability of the product's shape and structure.

[0033] In some embodiments, the top surfaces of the third ceramic sheet 8 and the second ceramic sheet 7 are respectively provided with first pin slots 17 and second pin slots 18 for the pins of the partitioned electrode sheets to pass through. In this embodiment, the top surface of each third ceramic sheet 8 is provided with a plurality of first pin slots 17 corresponding to the heating partitions on the side opposite to the second ceramic sheet 7, and the top surface of the second ceramic sheet 7 is provided with a plurality of second pin slots 18 corresponding to the first pin slots 17 on the third ceramic sheet 8 adjacent to it. The first pin slots 17 and second pin slots 18 corresponding to the same heating partition are on the same straight line and are arranged along the length direction of the common terminal electrode sheet 10, so that except for the partitioned electrode sheets close to the second ceramic sheet 7, the pins of the other partitioned electrode sheets can be led out from one side of the second ceramic sheet 7 after passing through the corresponding first pin slots 17 and second pin slots 18. Furthermore, in addition to the heating zone near the first ceramic plate 6, a fourth ceramic plate 9 is also provided on one side of the PTC heating chip in each of the other heating zones. The top surface of the fourth ceramic plate 9 is provided with a third pin slot 19 for the pins of the zone electrode plates to pass through. In this embodiment, the top surface of each fourth ceramic plate 9 is provided with a plurality of third pin slots 19 corresponding one-to-one with the first pin slots 17 on the third ceramic plate 8 on the side opposite to the second ceramic plate 7. The first pin slots 17, second pin slots 18, and third pin slots 19 corresponding to the same heating zone are on the same straight line and are all arranged along the length direction of the common terminal electrode plate 10, so that except for the zone electrode plate near the second ceramic plate 7, the pins of the other zone electrode plates can be led out from one side of the second ceramic plate 7 through the corresponding first pin slots 17, second pin slots 18, and third pin slots 19.

[0034] When the common terminal electrode plate 10 has two heating zones, a third ceramic plate 8 is provided between the first ceramic plate 6 and the second ceramic plate 7, and a fourth ceramic plate 9 is provided between the second ceramic plate 7 and the third ceramic plate 8, such as... Figure 1As shown, the top surface of the third ceramic plate 8 is provided with a first pin slot 17, the top surface of the second ceramic plate 7 is provided with a second pin slot 18, and the top surface of the fourth ceramic plate 9 is provided with a third pin slot 19. The first pin slot 17, the second pin slot 18 and the third pin slot 19 are on the same straight line. The pins of the partition electrode plates corresponding to the heating partitions away from the second ceramic plate 7 are led out from one side of the second ceramic plate 7 after passing through the first pin slot 17, the third pin slot 19 and the second pin slot 18 in sequence.

[0035] When the common terminal electrode plate 10 has three heating zones, two third ceramic plates 8 are provided between the first ceramic plate 6 and the second ceramic plate 7. A first pin slot 17 is provided on the top surface of the third ceramic plate 8 closest to the first ceramic plate 6, and two first pin slots 17 are provided on the top surface of the third ceramic plate 8 closest to the second ceramic plate 7. A third pin slot 19 is provided on the top surface of the fourth ceramic plate 9 between the third ceramic plates 8 and the second ceramic plate 7, and two third pin slots are provided on the top surface of the fourth ceramic plate 9 between the third ceramic plates 8 and the second ceramic plate 7. 19. Two second pin slots 18 are provided on the top surface of the second ceramic plate 7. The pins of the heating zone electrode plates near the first ceramic plate 6 are led out from one side of the second ceramic plate 7 after passing through a first pin slot 17, a third pin slot 19, a first pin slot 17, a third pin slot 19, and a second pin slot 18 in sequence. The pins of the heating zone electrode plates in the middle are led out from one side of the second ceramic plate 7 after passing through a first pin slot 17, a third pin slot 19, and a second pin slot 18 in sequence. The pin slots enable the orderly lead-out of the pins of the heating zone electrode plates, avoiding pin confusion and crossing.

[0036] Furthermore, the width of the first pin slot 17 is slightly wider than the width of the third pin slot 19 and the width of the second pin slot 18, to ensure that the rounded corners generated by the bending of the partition electrode sheet can also be placed in the slot.

[0037] Furthermore, the thickness of the fourth ceramic sheet 9 is slightly thicker than that of the first ceramic sheet 6, the second ceramic sheet 7, and the third ceramic sheet 8, and the thickness of the first ceramic sheet 6, the second ceramic sheet 7, and the third ceramic sheet 8 is consistent with the thickness of the PTC heating chip.

[0038] Preferably, the thickness of the fourth ceramic sheet 9 is between the thickness of the PTC heating chip and the sum of the thicknesses of the PTC heating chip and the partition electrode sheet. The thickness of the fourth ceramic sheet 9 is designed so that the pins of the partition electrode sheet are completely recessed into the grooves of the ceramic sheet. Simultaneously, the partition electrode sheets of other heating zones on one side of their pins are constrained by the size of the corresponding fourth ceramic sheet 9, preventing them from moving towards the pins of that partition electrode sheet. This ensures that the partition electrode sheets maintain an insulating distance during production and subsequent use.

[0039] In this embodiment, the first ceramic sheet 6, the second ceramic sheet 7, the third ceramic sheet 8, and the fourth ceramic sheet 9 are made of alumina ceramic with a content of more than 95%, and are sintered using a mold with a specific shape.

[0040] In this embodiment, a positioning plug 3 is provided on one side of the heating structure. The positioning plug 3 has multiple positioning holes, and the pins of the common terminal electrode 10 and the pins of each of the partitioned electrode plates extend through different positioning holes. For example... Figure 1 As shown, the positioning holes on the positioning plug 3 correspond one-to-one with the pins of the common terminal electrode 10 and the pins of each partition electrode. By extending the pins of the common terminal electrode 10 and each partition electrode from the corresponding positioning holes on the positioning plug 3, it is ensured that each pin can be accurately positioned and installed.

[0041] Furthermore, the PTC heating rod also includes an aluminum tube 12 and an insulating film 11. The heating structure is covered with the insulating film 11 and installed in the aluminum tube 12. In this embodiment, the electrode plates in the heating structure have no frame, so they can directly contact the insulating film 11, reducing the use of a ceramic substrate and thus lowering the product's weight and cost.

[0042] In this embodiment, the insulating film 11 is preferably made of polyimide film, which has excellent insulation properties; the aluminum tube 12 is formed by two wide sidewalls on the top and bottom and two narrow sidewalls on the left and right, and the two narrow sidewalls are concave inward in an arc shape or other shapes that make the aluminum tube 12 easy to deform.

[0043] The assembly process of the PTC heating rod in this embodiment is as follows:

[0044] Using the common terminal electrode plate 10 as the assembly base, a second ceramic plate 7 and a PTC heating chip are placed on top of the common terminal electrode plate 10, starting from one pin end. Then, a third ceramic plate 8 and a PTC heating chip are placed alternately towards the tail end. A fourth ceramic plate is placed on one side of the PTC heating chip between the third ceramic plates 8 and between the third ceramic plate 8 and the second ceramic plate 7. Then, a first ceramic plate 6 is placed on the other side of the PTC heating chip at the tail end. Then, corresponding partition electrode plates are placed on top of the PTC heating chips of each heating zone in sequence. The pins of the partition electrode plates other than those near the second ceramic plate 7 are led out to one side of the second ceramic plate 7 through the corresponding pin slots on the third ceramic plate 8, the fourth ceramic plate, and the second ceramic plate 7. A positioning plug 3 is installed, which is in close contact with the large surface of the second ceramic plate 7, the partition electrode plates, and the common terminal electrode plate 10. The pins of the electrode plates extend out from the corresponding positioning holes on the positioning plug 3. At this point, a semi-finished heating structure is assembled, and multiple heating zones have been formed. Then, an insulating film 11 is wrapped or pasted around the outside of the semi-finished heating structure, followed by the aluminum tube 12. Pressure is applied to deform the aluminum tube 12 to complete the encapsulation of the heating rod assembly.

[0045] This utility model also provides a PTC heater, including at least one PTC heating rod as described in any one of the above embodiments. The PTC heating rod with zone heating in this embodiment can be applied to PTC heaters with multi-zone requirements. Each heating zone can be controlled separately by the PTC heater or the vehicle-integrated controller to achieve zone heating function.

[0046] In some embodiments, the PTC heater includes two or more PTC heating rods as described above. By combining two or more PTC heating rods and coordinating with the power control of the controller, multiple heating zones of the PTC heater can achieve different heat output functions, thereby providing greater heating power and a wider heating area.

[0047] The structure of the PTC heating rod of this utility model will be described in detail below through a specific embodiment.

[0048] like Figures 1-4As shown, a PTC heating rod with zoned heating includes a heating structure. The heating structure includes a common end electrode plate 10. A first ceramic plate 6, a third ceramic plate 8, and a second ceramic plate 7 are sequentially arranged along the length direction of the common end electrode plate 10. A first heating zone 13 is formed between the first ceramic plate 6 and the third ceramic plate 8. A plurality of first PTC heating chips 4 are arranged in the first heating zone 13, and a first zone electrode plate 1 is arranged on the plurality of first PTC heating chips 4. A second heating zone 14 is formed between the third ceramic plate 8 and the second ceramic plate 7. A plurality of second PTC heating chips 5 are arranged in the second heating zone 14, and a second zone electrode plate 2 is arranged on the plurality of second PTC heating chips 5. The first partition electrode 1 on one side of the multiple first PTC heating chips 4 serves as the negative electrode of the first heating partition 13, and the second partition electrode 2 on one side of the multiple second PTC heating chips 5 serves as the negative electrode of the second heating partition 14. The length of the common terminal electrode 10 covers the other side of the multiple first PTC heating chips 4 and the other side of the multiple second PTC heating chips 5 and serves as the positive electrode of all PTC heating chips. Connecting the circuit between the common terminal electrode 10 and the first partition electrode 1 can achieve heating of the first heating partition 13, and connecting the circuit between the common terminal electrode 10 and the second partition electrode 2 can achieve heating of the second heating partition 14. When corresponding to different heating requirements, different partition heating can be achieved by connecting the corresponding circuit.

[0049] The first partition electrode 1 has a first pin 20, the second partition electrode 2 has a second pin 21, and the common terminal electrode 10 has a third pin 22. The first pin 20, the second pin 21, and the third pin 22 all extend to the side of the second ceramic plate 7 away from the second heating partition 14 to facilitate connection with the power supply of the PTC heater.

[0050] Multiple first PTC heating chips 4 are of the same size, multiple second PTC heating chips 5 are of the same size, and the width of the first PTC heating chip 4 is greater than the width of the second PTC heating chip 5, so that the first pin 20 of the first partition electrode can extend from one side of the second PTC heating chip 5 to the side of the second ceramic plate 7 away from the second heating partition 14.

[0051] One side of the end of the first partition electrode is bent downward to form a bent portion 16 and connected to one end of the first pin 20. The other end of the first pin 20 extends from one side of the second PTC heating chip 5 to the side of the second ceramic sheet 7 away from the second heating partition 14. A bend-side slot 15 is provided on the side of the bent portion 16 away from the first pin 20 on the first partition electrode.

[0052] The top surfaces of the third ceramic sheet 8 and the second ceramic sheet 7 are respectively provided with a first pin slot 17 and a second pin slot 18. A fourth ceramic sheet 9 is provided on one side of the second PTC heating chip 5 in the second heating zone 14. A third pin slot 19 is provided on the top surface of the fourth ceramic sheet 9. The first pin slot 17, the second pin slot 18 and the third pin slot 19 are on the same straight line. The first pin 20 of the first partition electrode sheet 1 extends to the side of the second ceramic sheet 7 away from the second heating zone 14 after passing through the first pin slot 17, the third pin slot 19 and the second pin slot 18 in sequence.

[0053] The width of the first pin slot 17 is slightly wider than the width of the second pin slot 18 and the third pin slot 19; the thickness of the first ceramic sheet 6, the second ceramic sheet 7 and the third ceramic sheet 8 is the same as the thickness of the PTC heating chip, and the thickness of the fourth ceramic sheet 9 is greater than the thickness of the PTC heating chip, but less than the sum of the thicknesses of the PTC heating chip and the second partition electrode sheet 2.

[0054] A positioning plug 3 is provided on one side of the heating structure in this embodiment. The positioning plug 3 has three positioning holes. The third pin 22 of the common terminal electrode 10, the first pin 20 of the first partition electrode, and the second pin 21 of the second partition electrode extend out of the three positioning holes respectively.

[0055] The PTC heating rod in this embodiment also includes an aluminum tube 12 and an insulating film 11. The heating structure is covered with the insulating film 11, and the heating structure covered with the insulating film 11 is installed in the aluminum tube 12.

[0056] The assembly process of the PTC heating rod in this embodiment is as follows:

[0057] Using the common terminal electrode plate 10 as the assembly base, the second ceramic plate 7 and the second PTC heating chip 5 are placed on top of the common terminal electrode plate 10, starting from one pin end. Then, the third ceramic plate 8 and the first PTC heating chip 4 are placed sequentially towards the tail. A fourth ceramic plate is placed on one side of the PTC heating chip between the third ceramic plate 8 and the second ceramic plate 7. Then, the first ceramic plate 6 is placed on the other side of the PTC heating chip at the tail. Then, the corresponding first partition electrode plate 1 and second partition electrode plate 2 are placed on top of the first PTC heating chip 4 and the second PTC heating chip 5 in sequence. The first pin 20 is led out to one side of the second ceramic plate 7 through the first pin slot 17, the third pin slot 19, and the second pin slot 18. The positioning plug 3 is installed, and the positioning plug 3 is in close contact with the large surface of the second ceramic plate 7, the second partition electrode plate 2, and the large surface of the common terminal electrode plate 10. The first pin 20, the second pin 21, and the third pin 22 extend out from the corresponding positioning holes on the positioning plug 3. At this point, a semi-finished heating structure is assembled, and the first heating partition 13 and the second heating partition 14 have been formed. Then, an insulating film 11 is wrapped or pasted around the outside of the semi-finished heating structure, followed by the aluminum tube 12. Pressure is applied to deform the aluminum tube 12 to complete the encapsulation of the heating rod assembly.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PTC heating rod with zoned heating, comprising a heating structure, characterized in that: The heating structure includes a common terminal electrode sheet, on which a first ceramic sheet and a second ceramic sheet are respectively disposed at both ends. The first ceramic sheet and the second ceramic sheet are separated by several third ceramic sheets to form a plurality of heating zones arranged at intervals. Each heating zone is provided with at least one PTC heating chip, and a zone electrode sheet is disposed above the PTC heating chip in each heating zone.

2. The PTC heating rod as described in claim 1, characterized in that: The pins of the common terminal electrode and the pins of each of the partitioned electrode plates extend to the same side of the heating structure.

3. The PTC heating rod as described in claim 1, characterized in that: Along the direction from the first ceramic sheet to the second ceramic sheet, the width of the PTC heating chip in the plurality of heating zones decreases sequentially.

4. The PTC heating rod as described in claim 3, characterized in that: Except for the partitioned electrode sheet near the second ceramic sheet, one side of the end of each of the other partitioned electrode sheets is bent downward to form a bent portion and connected to one end of the corresponding pin, and the other end of the pin extends from one side to the outside of the second ceramic sheet.

5. The PTC heating rod as described in claim 4, characterized in that: The side of the bent portion away from the corresponding pin has a bend-side slot.

6. The PTC heating rod as described in claim 4, characterized in that: In addition to the heating zone near the first ceramic plate, a fourth ceramic plate is also provided on one side of the PTC heating chip in each of the other heating zones. The top surfaces of the fourth ceramic plate, the third ceramic plate and the second ceramic plate are respectively provided with pin slots for the pins of the zone electrode plates to pass through.

7. The PTC heating rod as described in claim 6, characterized in that: The thickness of the fourth ceramic sheet is between the thickness of the PTC heating chip and the sum of the thicknesses of the PTC heating chip and the partitioned electrode sheet.

8. The PTC heating rod as described in claim 1, characterized in that: A positioning plug is provided on one side of the heating structure. The positioning plug has multiple positioning holes. The pins of the common terminal electrode and the pins of each of the partition electrode plates extend through different positioning holes.

9. The PTC heating rod as described in claim 1, characterized in that: It also includes an aluminum tube and an insulating film, wherein the heating structure is covered with an insulating film and installed in the aluminum tube.

10. A PTC heater, characterized in that: It includes at least one PTC heating rod as described in any one of claims 1-9.

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