Integrated injection molding type heating device

Abstract

The utility model particularly relates to an integrated injection molding type heating device, which comprises a PCB (printed circuit board) and a rubber-coated shell, at least one end face of the PCB is provided with a resistance heating body electrically connected with the PCB, the middle part of the rubber-coated shell is provided with a first through hole penetrating through the rubber-coated shell from top to bottom, the middle part of the PCB is provided with a second through hole penetrating through the PCB from top to bottom, and the first through hole is communicated with the second through hole. A containing cavity used for containing the PCB and the resistance heating body is formed in the rubber-coated shell, and the rubber-coated shell is integrally formed in an injection molding mode. According to the integrated injection molding type heating device, after the resistance heating body electrically connected with the PCB is arranged on the flat PCB, the rubber coating shell is formed in an injection molding mode to coat the PCB and the resistance heating body, so that the resistance heating body, the PCB and the rubber coating shell form an integrated structure, the resistance heating body is reliably sealed, internal wiring can be simplified, and the cost is reduced. The product reliability is improved, the service life is prolonged, and the product structure is compact.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heating body, concretely relates to an integral injection molding type heating device. BACKGROUND

[0002] At present, people often use aromatherapy machines and liquid electric mosquito repellents and other volatile products in daily life. When using the aromatherapy machines and liquid electric mosquito repellents and other products, the liquid volatile medium is usually placed in a container, and then the volatile medium is volatilized into the air through the heating of the electric heating assembly. The electric heating volatilizer can heat the wick on the volatilizer through the heating device, so that the volatile medium absorbed by the wick is volatilized and then dispersed in the air to produce an effect. The existing heating assembly device usually includes a heating body and a mounting seat for fixing the heating body. The mounting seat has a through hole for the heating body to pass through and a wire passing hole for the wire to pass through. The mounting seat and the heating body are usually combined by mechanical splicing or compression. This can easily cause gaps between the mounting seat and the heating body, poor sealing of the heating body, and displacement of the wire during production. This can affect the reliability of the product and complicate the production process, which needs to be further improved. SUMMARY

[0003] To overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide an integral injection molding type heating device. The injection molding type heating device installs a resistance heating body electrically connected to a PCB board on the flat PCB board. The resistance heating body is covered by a glue-coated shell formed by injection molding, so that the resistance heating body, the PCB board, and the glue-coated shell form an integrated structure. The resistance heating body is reliably sealed, the internal wiring is simplified, the reliability and service life of the product are improved, the product structure is compact, the product is convenient to use, and the product is easy to process.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: an integral injection molding type heating device includes a PCB board and a glue-coated shell. At least one end surface of the PCB board is provided with a resistance heating body electrically connected to the PCB board. The middle part of the glue-coated shell is provided with a first through hole penetrating the glue-coated shell from top to bottom. The middle part of the PCB board is provided with a second through hole penetrating the PCB board from top to bottom. The glue-coated shell is provided with a containing cavity for placing the PCB board and the resistance heating body. The glue-coated shell is integrally injection molded.

[0005] Furthermore, the encapsulated housing includes an inner wall surrounding the first through hole, an outer wall surrounding the inner wall and spaced apart from it, an upper seat connected to the upper ends of the inner wall and the outer wall, and a base connected to the lower ends of the inner wall and the outer wall. The inner wall, outer wall, upper seat, and base form a receiving cavity. A resistive heating element electrically connected to the PCB board is provided on the upper surface of the PCB board, and the resistive heating element is located inside the receiving cavity.

[0006] Furthermore, the front and rear ends of the PCB board protrude forward and backward from the outer wall of the housing, respectively. The front end of the PCB board is provided with two spaced external pins, which protrude outward from the outer wall of the housing. The resistive heating element is electrically connected to the external pins via the PCB board.

[0007] Furthermore, there are multiple resistive heating elements, which are evenly distributed around the outer periphery of the second through hole.

[0008] Furthermore, the resistive heating element includes a heating resistor and a rubber coating film covering the surface of the heating resistor.

[0009] Furthermore, there are two resistive heating elements, which are symmetrically arranged on the outer periphery of the second through hole.

[0010] Furthermore, the two ends of the resistive heating element are respectively connected to fixed pins, and the fixed pins are electrically connected to the PCB board.

[0011] Furthermore, the front end of the rubber-coated housing is provided with a plurality of forward-extending first extension arms, which are spaced apart, and the front end of each first extension arm is provided with a positioning post for insertion into an external device.

[0012] Furthermore, the front end of the rubber-coated housing is provided with two forward-extending first extension arms, which are spaced apart. The front end of each first extension arm is provided with a positioning post for connecting to an external device, and two external pins are located between the two first extension arms.

[0013] Furthermore, the integrated injection-molded heating device also includes a plastic connecting part. There are two encapsulated shells and two PCB boards. Each PCB board has a resistive heating element electrically connected to the PCB board on its upper surface. The PCB board and the resistive heating element are both disposed in the accommodating cavity of the corresponding encapsulated shell. The two encapsulated shells are respectively connected to the two ends of the plastic connecting part.

[0014] Furthermore, the front ends of the two rubber-coated housings are provided with forward-extending first extension arms, and the front end of the connecting part is provided with forward-extending second extension arms. The first extension arms and the two second extension arms are spaced apart, and the front ends of the first extension arms and the two extension arms are provided with positioning posts for insertion into external devices.

[0015] The beneficial effects of this utility model are as follows: The injection-molded heating device of this utility model sets a resistive heating element electrically connected to the PCB board on a flat PCB board, and forms a rubber shell by injection molding to cover the PCB board and the resistive heating element, so that the resistive heating element, PCB board and rubber shell form an integrated structure. The resistive heating element is reliably sealed, and the internal wiring can be simplified, which improves the reliability and service life of the product. The product has a compact structure, is easy to use and easy to process. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the integrated injection-molded heating device of Example 1.

[0017] Figure 2 This is a three-dimensional structural diagram of the integrated injection-molded heating device of Example 1 from another perspective.

[0018] Figure 3 This is an exploded view of the integrated injection-molded heating device of Example 1.

[0019] Figure 4 This is a three-dimensional structural diagram of the integrated injection-molded heating device of Example 2.

[0020] Figure 5 This is a three-dimensional structural diagram of the integrated injection-molded heating device of Example 2 from another perspective.

[0021] Figure 6 This is an exploded view of the integrated injection-molded heating device of Example 2.

[0022] Figure 7 This is a three-dimensional structural diagram of the integrated injection-molded heating device of Example 3.

[0023] Figure 8 This is a three-dimensional structural diagram of the integrated injection-molded heating device of Example 3 from another perspective.

[0024] Figure 9 This is an exploded view of the integrated injection-molded heating device of Example 3.

[0025] The reference numerals in the attached drawings include: 1. Rubber-coated housing; 11. First through hole; 12. Inner wall of housing; 13. Outer wall of housing; 14. First extension arm; 141. Positioning post; 15. Rubber ring; 16. Protruding post; 17. Enclosure; 2. PCB board; 21. Second through hole; 22. Fixing pin; 23. Slot; 3. Resistive heating element; 4. External pin; 5. Plastic connecting part; 51. Second extension arm; 511. Bending part; 52. Buckle. Detailed Implementation

[0026] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0027] Example 1

[0028] like Figures 1-3 As shown, an integral injection-molded heating device includes a PCB board 2 and a rubber-coated housing 1. The upper end face of the PCB board 2 is provided with a resistive heating element 3 electrically connected to the PCB board 2. The middle part of the rubber-coated housing 1 is provided with a first through hole 11 extending from top to bottom through the rubber-coated housing 1. The middle part of the PCB board 2 is provided with a second through hole 21 extending from top to bottom through the PCB board 2. The rubber-coated housing 1 is provided with a receiving cavity for placing the PCB board 2 and the resistive heating element 3. The rubber-coated housing 1 is integrally injection molded.

[0029] In this embodiment, the injection-molded heating device pre-installs a resistive heating element 3 electrically connected to the flat PCB board 2, and then uses injection molding to form a rubber-coated shell 1 to cover the PCB board 2 and the resistive heating element 3. This makes the resistive heating element 3, PCB board 2, and rubber-coated shell 1 an integral structure. The rubber-coated shell 1 has good sealing performance, which can achieve good sealing of the resistive heating element 3, improve the reliability and service life of the product, simplify internal wiring, reduce the adverse effects of repeated bending of wires, and make the product compact, easy to use, and easy to process. In this embodiment, the rubber-coated shell 1 is integrally injection molded, and an internal cavity is formed for placing the PCB board 2 and the resistive heating element 3, which not only simplifies the assembly process but also improves the sealing and durability of the heating device. The second through hole 21 is used for the core rod of the liquid container to pass through.

[0030] Furthermore, the encapsulated housing 1 includes an inner wall 12 surrounding the first through hole 11, an outer wall 13 surrounding the inner wall 12 and spaced apart from it, an upper seat connected to the upper ends of the inner wall 12 and the outer wall 13, and a base connected to the lower ends of the inner wall 12 and the outer wall 13. The inner wall 12, the outer wall 13, the upper seat, and the base form a receiving cavity, and the resistive heating element 3 is located within the receiving cavity. At least one end of the PCB board 2 protrudes outward from the outer wall 13. In this embodiment, the encapsulated housing 1 is integrally injection molded, and the housing is tightly integrated with the internal components, improving the waterproof and dustproof performance of the heating device, while enhancing the stability of the structure. The encapsulated housing 1 has good protective performance, providing long-term protection for the internal PCB board and the resistive heating element 3, adapting to different usage environments and working conditions, enhancing the durability of the product, and expanding its application range.

[0031] Furthermore, the front and rear ends of the PCB board 2 protrude forward and backward from the outer wall 13 of the housing, respectively. In this embodiment, the front and rear ends of the PCB board 2 extend forward and backward, respectively, protruding from the outer wall 13 of the rubber-coated housing 1. The front and rear ends of the PCB board 2 are respectively provided with slots 23 to facilitate connection with external devices.

[0032] Furthermore, the upper and lower ends of the coated housing 1 are respectively provided with upwardly extending and downwardly extending rubber rings 15, which surround the outer periphery of the first through hole 11. This structure helps to increase the length of the first through hole 11, thereby increasing the heating effect on the mandrel passing through it. In this embodiment, both the first through hole 11 and the second through hole 21 are cylindrical through holes, and the rubber ring 15 is annular. The annular shape of the rubber ring 15 matches the cylindrical through hole, facilitating the passage of the mandrel through the cylindrical first through hole 11; the shape of the second through hole 21 matches the first through hole 11, facilitating the placement of the PCB board 2 inside the coated housing 1, achieving a good fit between the two.

[0033] Furthermore, the number of resistive heating elements 3 is two, and the two resistive heating elements 3 are symmetrically arranged on the outer periphery of the second through hole 21. In this embodiment, the two resistive heating elements 3 are symmetrically arranged on the outer periphery of the second through hole 21, which allows heat to be dissipated relatively evenly in all directions during operation. Compared with a single resistive heating element 3, the symmetrical distribution can better avoid local overheating, making the temperature distribution more even and helping to improve the heating effect. In other embodiments of this utility model, different numbers of resistive heating elements 3 can be set as needed and the resistive heating elements 3 can be evenly arranged.

[0034] Furthermore, the resistive heating element 3 is a horizontally placed cylindrical shape, and its two ends are respectively connected to fixed pins 22, which are electrically connected to the PCB board 2. The fixed pins 22 serve as an electrical connection, connecting the resistive heating element 3 to the PCB board 2 to generate heat, and can also be used to fix the resistive heating element 3, ensuring its stable position in the device. In this embodiment, the resistive heating element 3 can be fixed to the PCB board 2 via a solder plate or wire bonding connection. The resistive heating element 3 includes a heating resistor and an adhesive film covering the surface of the heating resistor. The adhesive film provides good protection and isolation for the heating resistor, improving the safety and reliability of the product.

[0035] In this embodiment, the lower end face of the rubber-coated housing 1 is provided with a plurality of spaced protrusions 16. The fixing pin 22 is inserted into the corresponding protrusion 16, which helps to fix the position of the resistive heating element 3 and prevent it from being displaced during use.

[0036] Example 2

[0037] like Figures 4-6 As shown, the front and rear ends of the PCB board 2 protrude forward and backward from the outer wall 13 of the housing, respectively. The front end of the PCB board 2 has two spaced-apart external pins 4, which protrude outward from the outer wall 13 of the housing. The resistive heating element 3 is electrically connected to the external pins 4 via the PCB board 2. In this embodiment, the front and rear ends of the PCB board 2 extend forward and backward, respectively, and protrude from the outer wall 13 of the rubber-coated housing 1. The front and rear ends of the PCB board 2 are each provided with a slot 23 for easy connection to external devices. The external pins 4 are used to connect to an external power supply or control circuit to power the resistive heating element 3, and allow the heating device to be quickly plugged in and out of external devices, facilitating installation and maintenance.

[0038] Furthermore, the front end of the rubber-coated housing 1 is provided with two forward-extending first extension arms 14, which are spaced apart. The front end of each first extension arm 14 is provided with a positioning post 141 for insertion into an external device. Two external pins 4 are located between the two first extension arms 14. The positioning post 141 allows the heating device to be quickly and accurately installed into the external device, and helps increase the connection strength between the heating device and the external device, preventing it from falling off. The two external pins 4, located between the two first extension arms 14, make better use of space, making the heating device structure more compact. The cooperation between the external pins 4 and the positioning post 141 ensures more accurate alignment and a more stable connection when the heating device is inserted.

[0039] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0040] Example 3

[0041] like Figures 7-9 As shown, in this embodiment, the integrated injection-molded heating device further includes a plastic connecting part 5. There are two of each of the encapsulated housing 1 and PCB board 2. Each PCB board 2 has a resistance heating element 3 electrically connected to its upper surface. Both the PCB board 2 and the resistance heating element 3 are housed within the corresponding cavity of the encapsulated housing 1. The two encapsulated housings 1 are respectively connected to the two ends of the plastic connecting part 5. This embodiment's heating device forms two independent heating units by setting two spaced-apart encapsulated housings 1. Each encapsulated housing has a PCB board 2 and a resistance heating element 3. The resistance heating elements 3 installed on different PCB boards 2 can work simultaneously or alternately. In this embodiment, the two heating units can be set to work simultaneously to improve heating efficiency, or set to zone temperature control. When one heating unit fails, the other can continue to work, improving the reliability of the device. The plastic connecting part 5 and the two encapsulated housings 1 are integrally injection molded. The plastic connecting part 5 is located between the two encapsulated housings 1, connecting them into a whole, enhancing the structural strength of the heating device, and simplifying the installation process and product maintenance.

[0042] Furthermore, the front end of the PCB board 2 protrudes forward from the outer wall 13 of the housing, and each PCB board 2 has two spaced external pins 4 at its front end. The external pins 4 protrude outward from the outer wall 13 of the housing, and the resistive heating element 3 is electrically connected to the external pins 4 via the PCB board 2.

[0043] Furthermore, the front ends of the two rubber-coated housings 1 are provided with forward-extending first extension arms 14, and the front end of the plastic connecting part 5 is provided with forward-extending second extension arms 51. The second extension arms 51 and the two first extension arms 14 are spaced apart. The front ends of both the first extension arms 14 and the second extension arms 51 are provided with positioning posts 141 for insertion into external devices. The second extension arm 51 cooperates with the first extension arms 14 for connection to external devices, which can further enhance the connection stability and installation accuracy of the heating device to external devices.

[0044] Furthermore, the front end of the second extension arm 51 is provided with a downwardly extending bent portion 511. The bent portion 511 is L-shaped, and its lower end extends forward. The positioning post 141 is disposed at the front end of the bent portion 511. In this embodiment, the second extension arm 51 and the two first extension arms 14 are arranged in a triangular shape, which can enhance the connection strength between the heating device and the external device, prevent loosening or detachment during operation, and facilitate insertion with the external device.

[0045] Furthermore, the rear end of the plastic connecting part 5 is provided with a buckle 52 for engaging with an external device. The buckle 52 allows the heating device of this embodiment to be quickly installed into an external device with a secure connection, and also allows the heating device to be easily disassembled when maintenance or replacement is required.

[0046] Furthermore, the upper and lower ends of the rubber-coated housing 1 are respectively provided with upwardly extending and downwardly extending rubber rings 15, which surround the outer periphery of the first through hole 11. The lower end face of the rubber-coated housing 1 is provided with a plurality of spaced protrusions 16, and the fixing pin 22 is inserted into the corresponding protrusion 16. In this embodiment, the four protrusions 16 are rectangular and surround the rubber rings 15.

[0047] Furthermore, the lower end face of the rubber-coated housing 1 is provided with a surrounding wall 17, which forms a downward-opening receiving groove. The rubber ring 15 and the protruding post 16 are both located within the receiving groove. Due to the above-mentioned structural design, the rubber-coated housing 1 has a compact structure and is easy to install and mate with external devices.

[0048] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0049] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An integrated injection-molded heating device, characterized in that: The device includes a PCB board and a rubber-coated housing. At least one end face of the PCB board is provided with a resistive heating element electrically connected to the PCB board. The middle part of the rubber-coated housing is provided with a first through hole penetrating the rubber-coated housing from top to bottom. The middle part of the PCB board is provided with a second through hole penetrating the PCB board from top to bottom. The rubber-coated housing is provided with a receiving cavity for placing the PCB board and the resistive heating element. The rubber-coated housing is integrally injection molded.

2. The integrated injection-molded heating device according to claim 1, characterized in that: The encapsulated housing includes an inner wall surrounding the first through hole, an outer wall surrounding the inner wall and spaced apart from it, an upper seat connected to the upper ends of the inner wall and the outer wall, and a base connected to the lower ends of the inner wall and the outer wall. The inner wall, outer wall, upper seat, and base form a receiving cavity. A resistive heating element electrically connected to the PCB board is provided on the upper surface of the PCB board, and the resistive heating element is located inside the receiving cavity.

3. The integrated injection-molded heating device according to claim 2, characterized in that: The front and rear ends of the PCB board protrude forward and backward from the outer wall of the housing, respectively. The front end of the PCB board is provided with two spaced external pins that protrude outward from the outer wall of the housing. The resistive heating element is electrically connected to the external pins via the PCB board.

4. The integrated injection-molded heating device according to claim 1, characterized in that: The number of resistive heating elements is multiple, and the multiple resistive heating elements are evenly distributed on the outer periphery of the second through hole.

5. The integrated injection-molded heating device according to claim 1, characterized in that: The resistive heating element includes a heating resistor and a rubber coating film covering the surface of the heating resistor.

6. The integrated injection-molded heating device according to claim 1, characterized in that: The two ends of the resistive heating element are respectively connected to fixed pins, and the fixed pins are electrically connected to the PCB board.

7. The integrated injection-molded heating device according to claim 1, characterized in that: The front end of the rubber-coated housing is provided with a plurality of forward-extending first extension arms, which are spaced apart. The front end of each first extension arm is provided with a positioning post for insertion into an external device.

8. The integrated injection-molded heating device according to claim 3, characterized in that: The front end of the rubber-coated housing is provided with two forward-extending first extension arms, which are spaced apart. The front end of each first extension arm is provided with a positioning post for connecting to an external device, and two external pins are located between the two first extension arms.

9. The integrated injection-molded heating device according to claim 1, characterized in that: The heating device also includes a plastic connecting part. There are two plastic-coated shells and two PCB boards. Each PCB board has a resistive heating element electrically connected to the PCB board on its upper surface. The PCB board and the resistive heating element are both disposed in the accommodating cavity of the corresponding plastic-coated shell. The two plastic-coated shells are respectively connected to the two ends of the plastic connecting part.

10. The integrated injection-molded heating device according to claim 9, characterized in that: The front ends of the two rubber-coated housings are provided with a first extension arm extending forward, and the front end of the connecting part is provided with a second extension arm extending forward. The first extension arm and the two second extension arms are spaced apart, and the front ends of the first extension arm and the two extension arms are provided with a positioning post for insertion with an external device.

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