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

Abstract

The invention relates to the technical field of PTC heating, in particular to a partition heating PTC heating rod and a PTC heater, which comprise a heating structure, the heating structure comprises a common end electrode plate, a first ceramic plate and a second ceramic plate are respectively arranged at two ends of the common end electrode plate, and the first ceramic plate and the second ceramic plate are arranged on the common end electrode plate. 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 invention, 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 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, deformation is not easy to occur, a plastic frame and a ceramic substrate are not needed, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of PTC heating, and particularly relates to a PTC heating rod and a PTC heater with zoned heating. Background Art

[0002] Due to the demand for energy conservation in new energy vehicle models, there are requirements for providing different heat outputs for areas corresponding to the driver's seat, passenger seat, rear row, etc. of the air conditioner. The existing PTC heating rods use injection-molded electrode sheets to achieve zoned heating. The electrode sheets are injection-molded in a plastic frame. Since the plastic frame wraps the electrode sheets, the heating rod needs to add a ceramic substrate outside the electrode sheets to ensure that there are no gaps in the heat transfer path from the heating chip to the electrode sheet to the ceramic substrate to the insulating film to the aluminum tube, resulting in a high cost. The injection-molded electrode sheets also need to customize injection molds for heaters of different sizes, with poor versatility. Moreover, only a ceramic substrate is arranged on one side of the injection-molded electrode sheet, and a heating chip, a common terminal electrode sheet, and a ceramic substrate are arranged on the other side. This causes the plastic thickness on both sides of the injection-molded electrode sheet to be inconsistent, easily leading to structural warping. The inner cavity structure of the injection-molded structure will have rounded corners due to limitations such as injection mold design. Therefore, the parts placed inside the injection-molded electrode sheet need to be designed with smaller sizes or synchronously increase the rounded corners to ensure that the structure does not interfere, which reduces the space utilization rate and increases the part cost. In addition, the operating temperature and voltage of the injection-molded electrode sheets are also strictly restricted. The heat distortion temperatures of the currently commonly used high-temperature plastic particle materials are all below 250°C, which further restricts the temperature of the PTC heating chips. The plastic particles are materials that can cause leakage tracking. In order to avoid insulation failures between the common terminal electrode sheet and the injection-molded electrode sheet, it is necessary to increase the thickness of the heating chips as much as possible, resulting in an increase in cost. Summary of the Invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a PTC heating rod and a PTC heater with zoned heating, which can at least solve some problems of the prior art.

[0004] To achieve the above purpose, the technical solution of the present invention is a PTC heating rod with zoned heating, including a heating structure. The heating structure includes a common terminal electrode sheet. First ceramic sheets and second ceramic sheets are respectively arranged at both ends of the common terminal electrode sheet. A plurality of third ceramic sheets are arranged between the first ceramic sheet and the second ceramic sheet to form a plurality of heating zones arranged at intervals in sequence. At least one PTC heating chip is arranged in each heating zone, and a zoned electrode sheet is arranged above the PTC heating chip in each heating zone.

[0005] As one of the embodiments, the pins of the common terminal electrode sheet and the pins of each zoned electrode sheet all extend to the same side of the heating structure.

[0006] As one of the implementation manners, along the direction from the first ceramic sheet to the second ceramic sheet, the widths of the PTC heating chips in the plurality of heating zones decrease in sequence.

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

[0008] As one of the implementation manners, a bent-side slotted groove is provided on the side of the bent portion away from connecting the corresponding lead.

[0009] As one of the implementation manners, a first lead slotted groove and a second lead slotted groove for the leads of the partition electrode sheets to pass through are respectively provided on the top surfaces of the third ceramic sheet and the second ceramic sheet.

[0010] As one of the implementation manners, except for the heating zone near the first ceramic sheet, a fourth ceramic sheet is further provided on one side of the PTC heating chips in each of the other heating zones, and lead slotted grooves for the leads of the partition electrode sheets to pass through are respectively provided on the top surfaces of the fourth ceramic sheet, the third ceramic sheet, and the second ceramic sheet.

[0011] As one of the implementation manners, 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 partition electrode sheet.

[0012] As one of the implementation manners, the PTC heating rod further includes an aluminum tube and an insulating film, the heating structure is coated with the insulating film and is installed in the aluminum tube.

[0013] The present invention further provides a PTC heater, including 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) The present invention separates the PTC heating chips in the PTC heating rod through ceramic sheets to form a plurality of heating zones, and partition electrode sheets are respectively provided in each heating zone and cooperate with the common terminal electrode sheet, so as to realize the partition heating function. The structure is simple, not easy to deform, and there is no need for a plastic frame or a ceramic substrate, and the cost is low;

[0016] (2) By combining different numbers of ceramic sheets and different numbers of PTC heating chips, the present invention can realize heating rods with a partition heating function of various specifications, so as to adapt to heaters of various sizes, and there is no need to customize an injection mold;

[0017] (3) The temperature resistance range of the PTC heating rod of the present invention is a wide temperature range from -60°C to 300°C, and it can be used under a voltage of 1200V or less, which can cover the high-voltage power supply voltage range of mainstream new energy vehicles on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is an exploded view of the PTC heating rod with zoned heating provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the semi-finished product zoning of the PTC heating rod with zoned heating provided by an embodiment of the present invention;

[0021] Figure 3 It is an assembly drawing of the PTC heating rod with zoned heating provided by an embodiment of the present invention;

[0022] Figure 4 It is a partial detailed drawing of the PTC heating rod with zoned heating provided by an embodiment of the present invention;

[0023] In the figure: 1. First zoned electrode plate; 2. Second zoned electrode plate; 3. Positioning rubber plug; 4. First PTC heating chip; 5. Second PTC heating chip; 6. First ceramic sheet; 7. Second ceramic sheet; 8. Third ceramic sheet; 9. Fourth ceramic sheet; 10. Common terminal electrode plate; 11. Insulating film; 12. Aluminum tube; 13. First heating zone; 14. Second heating zone; 15. Bent side slot; 16. Bent part; 17. First pin slot; 18. Second pin slot; 19. Third pin slot; 20. First pin; 21. Second pin; 22. Third pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0026] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "several" is one or more, and the meaning of "multiple" is two or more.

[0027] As Figures 1-4 shown, an embodiment of the present invention provides a PTC heating rod with zoned heating, including a heating structure. The heating structure includes a common terminal electrode plate 10. First ceramic sheets 6 and second ceramic sheets 7 are respectively arranged at both ends of the common terminal electrode plate 10. A plurality of third ceramic sheets 8 are arranged between the first ceramic sheet 6 and the second ceramic sheet 7 to be separated to form a plurality of heating zones arranged at intervals in sequence. Each heating zone is provided with at least one PTC heating chip, and a zoned electrode plate is arranged above the PTC heating chip of each heating zone. In this embodiment, the PTC heating chips in the PTC heating rod are separated by ceramic sheets to form a plurality of heating zones, and zoned electrode plates are respectively arranged in each heating zone and cooperate with the common terminal electrode plate 10, so as to realize the zoned heating function. Its structure is simple, not easy to deform, and there is no need for a plastic frame or a ceramic substrate, and the cost is low; by combining different numbers of ceramic sheets and different numbers of PTC heating chips, heating rods with zoned heating functions of various specifications can be realized, so as to adapt to heaters of various sizes without customizing injection molds. Moreover, the temperature resistance of the ceramic sheet usually reaches above 1000°C, which improves the temperature range of the PTC heating chips that can be selected in this embodiment. At the same time, the ceramic sheet will not produce tracking and erosion phenomena in the use environment, and only the creepage distance and electrical clearance of the product need to be considered in the design and use, reducing the development difficulty and reducing the product volume.

[0028] In this embodiment, the bottom surface of the PTC heating chip in each heating zone contacts the common terminal electrode sheet 10, and the top surface contacts the corresponding zone electrode sheet. In this embodiment, each zone electrode sheet serves as the negative electrode of the corresponding heating zone, and the length of the common terminal electrode sheet 10 covers all the heating zones and serves as the positive electrode of all the heating zones. When the heater is turned off, the positive electrode corresponding to the common terminal electrode sheet 10 is still conducting, and the negative electrodes corresponding to each zone electrode sheet are turned off, so that a loop cannot be formed in the PTC heating rod. When corresponding to different heating requirements, the heater power relay or controller conducts the corresponding negative electrode, that is, when a certain heating zone needs to be turned on, the corresponding zone electrode sheet is connected to the power supply circuit.

[0029] To optimize the above embodiment, the pins of the common terminal electrode sheet 10 and the pins of each of the zone electrode sheets extend to the same side of the heating structure. Preferably, the pins of the common terminal electrode sheet 10 and all the zone electrode sheets extend to the side of the PTC heater power supply, so as to facilitate connection to the power supply and reduce the length and complexity of the connecting wires.

[0030] In some embodiments, along the direction from the first ceramic sheet 6 to the second ceramic sheet 7, the widths of the PTC heating chips in multiple heating zones decrease in sequence. In this embodiment, the width direction of the PTC heating chip is the same as the width direction of the common terminal electrode sheet 10. By arranging multiple heating zones at intervals in sequence along the length direction of the common terminal electrode sheet 10 and decreasing the widths of the PTC heating chips in multiple heating zones in sequence, it is not only possible to achieve different heat generation amounts in multiple heating zones, but also convenient for the pins of all the zone electrode sheets to be led out from the same side of the heating structure.

[0031] Furthermore, except for the zone electrode sheet close to the second ceramic sheet 7, one side of the end of each of the other zone electrode sheets is bent downward to form a bent portion 16 and is 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 7. As Figure 1 shown, the pins of the zone electrode sheets close to the second ceramic sheet 7 are arranged horizontally and are led out from the top surface of the second ceramic sheet 7 to one side of the second ceramic sheet 7; one side of the end of the other zone electrode sheets is bent downward to form a bent portion 16 and is connected to one end of the corresponding pin, so that the pins of the other zone electrode sheets can be arranged vertically and extend from one side of the remaining zone electrode sheets to one side of the second ceramic sheet 7, which can not only effectively utilize the space and make the heating structure more compact in the width direction, but also make the pins of the other zone electrode sheets not protrude from the top surface of the zone electrode sheets, avoiding the additional thickness caused by the protruding pins and making the heating structure thinner and lighter in the thickness direction.

[0032] Furthermore, a bent side slot 15 is provided on the side of the bent portion 16 facing away from the connection to the corresponding pin. As Figure 4As shown, by providing a bending side groove 15 at a position near the end of the side of the partition electrode sheet, it is not only convenient to form a bending portion 16 at the end of the partition electrode sheet, but also a sufficient insulation distance can be provided between the bending portion 16 and the side of the corresponding PTC heating chip, thereby preventing the partition electrode sheet from short-circuiting to the common electrode sheet 10 through the corresponding PTC heating chip; at the same time, the bending side groove 15 can ensure that the bending of the partition electrode sheet during processing will not affect the large surface of the partition electrode sheet, thereby ensuring the stability of the product appearance structure.

[0033] In some embodiments, 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 for the pins of the partitioned electrode sheet 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 partition on the side away from 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 close thereto, and the first pin slots 17 and the 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 sheet 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 through the corresponding first pin slots 17 and second pin slots 18. Furthermore, in addition to the heating partition close to the first ceramic sheet 6, a fourth ceramic sheet 9 is also provided on one side of the PTC heating chip of each of the other heating partitions, and a third pin slot 19 for the pins of the partition electrode sheet to pass through is provided on the top surface of the fourth ceramic sheet 9. In this embodiment, a plurality of third pin slots 19 corresponding to the first pin slots 17 on the third ceramic sheet 8 on the side away from the second ceramic sheet 7 are provided on the top surface of each fourth ceramic sheet 9, and the first pin slots 17, the second pin slots 18, and the third pin slots 19 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 partition electrode sheet close to the second ceramic sheet 7, the pins of the other partition electrode sheets can be led out from one side of the second ceramic sheet 7 through the corresponding first pin slots 17, the second pin slots 18, and the third pin slots 19.

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

[0035] When there are three heating partitions on the common terminal electrode sheet 10, two third ceramic sheets 8 are provided between the first ceramic sheet 6 and the second ceramic sheet 7. A first pin slot 17 is provided on the top surface of the third ceramic sheet 8 close to the first ceramic sheet 6, and two first pin slots 17 are provided on the top surface of the third ceramic sheet 8 close to the second ceramic sheet 7. A third pin slot 19 is provided on the top surface of the fourth ceramic sheet 9 between the third ceramic sheet 8 and the third ceramic sheet 8, and two third pin slots 19 are provided on the top surface of the fourth ceramic sheet 9 between the third ceramic sheet 8 and the second ceramic sheet 7. Two second pin slots 18 are provided on the top surface of the second ceramic sheet 7. The pins of the partition electrode sheet of the heating partition close to the first ceramic sheet 6 are led out from one side of the second ceramic sheet 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 partition electrode sheet of the middle heating partition are led out from one side of the second ceramic sheet 7 after passing through a first pin slot 17, a third pin slot 19, and a second pin slot 18 in sequence. Through the pin slots, the pins of the partition electrode sheet can be led out orderly, avoiding the confusion and intersection of the pins.

[0036] Further, 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 slots.

[0037] Further, the thickness of the fourth ceramic sheet 9 is slightly thicker than the thickness of the first ceramic sheet 6, the second ceramic sheet 7, and the third ceramic sheet 8. The thicknesses of the first ceramic sheet 6, the second ceramic sheet 7, and the third ceramic sheet 8 are the same as 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. Through the design of the thickness of the fourth ceramic sheet 9, the pins of the partition electrode sheet are bent and completely sunk into the ceramic sheet slots. At the same time, the partition electrode sheets of other heating zones on one side of its pins are restricted by the size of the corresponding fourth ceramic sheet 9 and cannot move towards the pins of this partition electrode sheet, ensuring that the partition electrode sheets maintain an insulating distance during production and subsequent use.

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

[0040] In this embodiment, a positioning rubber plug 3 is provided on one side of the heating structure. A plurality of positioning holes are provided on the positioning rubber plug 3, and the pins of the common terminal electrode sheet 10 and the pins of each partition electrode sheet respectively extend out through different positioning holes. As Figure 1 shown, the positioning holes on the positioning rubber plug 3 correspond one-to-one with the pins of the common terminal electrode sheet 10 and the pins of each partition electrode sheet. By extending the pins of the common terminal electrode sheet 10 and each partition electrode sheet out through the corresponding positioning holes on the positioning rubber plug 3, it ensures that each pin can be accurately positioned and installed.

[0041] Furthermore, the PTC heating rod further includes an aluminum tube 12 and an insulating film 11. The heating structure is wrapped with the insulating film 11 and is installed in the aluminum tube 12. Since the electrode sheets in the heating structure of this embodiment have no frame, the electrode sheets can directly contact the insulating film 11, reducing the use of ceramic substrates, thereby reducing the weight and cost of the product.

[0042] In this embodiment, the insulating film 11 is preferably made of a polyimide film, which has excellent insulating properties; the aluminum tube 12 is formed by enclosing two wide side walls on the upper and lower sides and two narrow side walls on the left and right sides, and the two narrow side walls are recessed 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] Taking the common terminal electrode sheet 10 as the assembly basis, place the second ceramic sheet 7 and the PTC heating chip above the common terminal electrode sheet 10 starting from one end of the pin, then alternately place the third ceramic sheet 8 and the PTC heating chip in sequence towards the tail direction, and place the fourth ceramic sheet on one side of the PTC heating chip between the third ceramic sheet 8 and the third ceramic sheet 8 and between the third ceramic sheet 8 and the second ceramic sheet 7. Then place the first ceramic sheet 6 on the other side of the PTC heating chip at the tail. Then place the corresponding partition electrode sheets above the PTC heating chips in each heating partition in sequence, and lead out the pins of other partition electrode sheets except the partition electrode sheet close to the second ceramic sheet 7 through the corresponding pin slots on the third ceramic sheet 8, the fourth ceramic sheet, and the second ceramic sheet 7 to one side of the second ceramic sheet 7. Install the positioning rubber plug 3, and the positioning rubber plug 3 is closely attached to the large surfaces of the second ceramic sheet 7, the partition electrode sheet, and the common terminal electrode sheet 10, and extend the pins of the electrode sheet out from the corresponding positioning holes on the positioning rubber plug 3. Thus, a semi-finished heating structure is assembled, and multiple heating partitions are formed. Then wind or paste the insulating film 11 outside the semi-finished heating structure, and then put on the aluminum tube 12, and apply pressure to deform the aluminum tube 12 to complete the encapsulation of the heating rod assembly.

[0045] The present invention also provides a PTC heater, including at least one PTC heating rod as described in any one of the above. The PTC heating rod with partition heating in this embodiment can be applied to a PTC heater with multi-partition requirements, and each heating partition is separately controlled through a controller integrated in the PTC heater or the whole vehicle to achieve the function of partition heating.

[0046] In some embodiments, the PTC heater includes two or more PTC heating rods as described in any one of the above. By combining and using two or more PTC heating rods and cooperating with the power control of the controller, the function of different heat generation amounts can be achieved for multiple heating partitions of the PTC heater, thereby providing a greater heating power and a wider heating area.

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

[0048] As Figures 1-4As shown, a zoned heating PTC heating rod includes a heating structure, which includes a common end electrode sheet 10, on which a first ceramic sheet 6, a third ceramic sheet 8 and a second ceramic sheet 7 are sequentially arranged along its length direction, a first heating zone 13 is formed between the first ceramic sheet 6 and the third ceramic sheet 8, the first heating zone 13 is provided with a plurality of first PTC heating chips 4, and the first zone electrode sheet 1 is arranged on the plurality of first PTC heating chips 4; a second heating zone 14 is formed between the third ceramic sheet 8 and the second ceramic sheet 7, the second heating zone 14 is provided with a plurality of second PTC heating chips 5, and the second zone electrode sheet 2 is arranged on the plurality of second PTC heating chips 5. The first partition electrode sheet 1 on one side of the multiple first PTC heating chips 4 acts as the negative electrode of the first heating partition 13, and the second partition electrode sheet 2 on one side of the multiple second PTC heating chips 5 acts as the negative electrode of the second heating partition 14. The length of the common terminal electrode sheet 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 acts as the positive electrode of all PTC heating chips. By connecting the loop between the common terminal electrode sheet 10 and the first partition electrode sheet 1, the first heating partition 13 can be heated. By connecting the loop between the common terminal electrode sheet 10 and the second partition electrode sheet 2, the second heating partition 14 can be heated. When corresponding to different heating requirements, different partition heating can be achieved by connecting the corresponding loops.

[0049] The pin of the first partition electrode sheet 1 is the first pin 20, the pin of the second partition electrode sheet 2 is the second pin 21, and the pin of the common terminal electrode sheet 10 is the 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 sheet 7 away from the second heating partition 14 to facilitate connection with the power supply of the PTC heater.

[0050] The multiple first PTC heating chips 4 have the same size, the multiple second PTC heating chips 5 have 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 sheet 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 bending portion 16, and is 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 bending side groove 15 is provided on the first partition electrode on the side of the bending portion 16 away from the first pin 20.

[0052] 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 on the top surfaces, a fourth ceramic sheet 9 is provided on one side of the second PTC heating chip 5 of the second heating partition 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, and the first pin 20 of the first partition electrode sheet 1 passes through the first pin slot 17, the third pin slot 19 and the second pin slot 18 in sequence and then extends to the side of the second ceramic sheet 7 away from the second heating partition 14.

[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 consistent with 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, and less than the sum of the thickness 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 of this embodiment. The positioning plug 3 is provided with three positioning holes. The third pin 22 of the common electrode sheet 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 of this embodiment further includes an aluminum tube 12 and an insulating film 11 . The heating structure is coated with the insulating film 11 , and the heating structure coated with the insulating film 11 is installed in the aluminum tube 12 .

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

[0057] With the common terminal electrode sheet 10 as the assembly basis, the second ceramic sheet 7 and the second PTC heating chip 5 are placed above the common terminal electrode sheet 10 starting from one end of the pin, and then the third ceramic sheet 8 and the first PTC heating chip 4 are sequentially placed towards the tail direction. The fourth ceramic sheet is placed on one side of the PTC heating chip between the third ceramic sheet 8 and the second ceramic sheet 7. Then, the first ceramic sheet 6 is placed on the other side of the PTC heating chip at the tail. Then, the corresponding first partition electrode sheet 1 and second partition electrode sheet 2 are placed above 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 sheet 7 through the first pin slot 17, the third pin slot 19, and the second pin slot 18. The positioning rubber plug 3 is installed. The positioning rubber plug 3 is closely attached to the large surfaces of the second ceramic sheet 7, the second partition electrode sheet 2, and the common terminal electrode sheet 10. The first pin 20, the second pin 21, and the third pin 22 are extended from the corresponding positioning holes on the positioning rubber plug 3. Thus, a semi-finished heating structure is assembled, and the first heating partition 13 and the second heating partition 14 are formed. Then, an insulating film 11 is wound or pasted outside the semi-finished heating structure, and then an aluminum tube 12 is sleeved, and pressure is applied to deform the aluminum tube 12 to complete the encapsulation of the heating rod assembly.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PTC heating rod for zone heating, comprising a heating structure, characterized in that: The heating structure includes a common-end electrode sheet, and a first ceramic sheet and a second ceramic sheet are respectively arranged on both ends of the common-end electrode sheet. The first ceramic sheet and the second ceramic sheet are separated by a plurality of third ceramic sheets to form a plurality of heating partitions arranged in sequence, each of the heating partitions is provided with at least one PTC heating chip, and a partition electrode sheet is arranged above the PTC heating chip of each heating partition.

2. The PTC heating rod according to claim 1, characterized in that: The pins of the common electrode sheet and the pins of each of the partitioned electrode sheets extend to the same side of the heating structure.

3. The PTC heating rod according to claim 1, characterized in that: Along the direction from the first ceramic sheet to the second ceramic sheet, the widths of the PTC heating chips of the plurality of heating partitions decrease sequentially.

4. The PTC heating rod according to claim 3, characterized in that: Except for the partitioned electrode sheet close to 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 a 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 according to claim 4, characterized in that: A bending side slot is arranged on a side of the bending portion away from the corresponding pin.

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

7. The PTC heating rod according to 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 partition electrode sheet.

8. The PTC heating rod according to claim 1, characterized in that: A positioning rubber plug is provided on one side of the heating structure. A plurality of positioning holes are provided on the positioning rubber plug. The pins of the common-end electrode sheet and the pins of each of the partitioned electrode sheets extend out through different positioning holes respectively.

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

10. A PTC heater, characterized in that: Comprising at least one PTC heating rod according to any one of claims 1 to 9.

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