A temperature-measuring thin-film heater

Abstract

This application discloses a temperature-sensing thin-film heater, belonging to the technical field of thin-film heaters. It includes: a thin-film body with a temperature-sensing device mounted on it; and a protective shell mounted on the thin-film body, protecting the temperature-sensing device and forming a space for adhesive injection. The thin-film body comprises: a first insulating film, a heating wire, and a second insulating film distributed sequentially from top to bottom. The upper surface of the second insulating film has an installation area, the heating wire is not distributed within the installation area, the temperature-sensing device is mounted in the installation area, and welding pins are also provided within the installation area, with the temperature-sensing device electrically connected to the welding pins. The beneficial effect of this application is that it provides a temperature-sensing thin-film heater. The temperature-sensing device enables temperature measurement of the thin-film body, avoiding inaccurate temperature measurements. The protective shell protects the temperature-sensing device, preventing any impact on the overall insulation and protective properties of the heater.

Description

Technical Field

[0001] This application relates to the field of thin-film heater technology, and more specifically, to a temperature-measuring thin-film heater. Background Technology

[0002] Thin-film heaters are thin-film heating devices that lay conductive heating elements in thin-film materials, such as polyimide (PI) heating films, which use polyimide film as the outer insulator and metal foil or metal wire as the inner conductive heating elements, and are formed by high-temperature and high-pressure heat sealing. Thin-film heaters have excellent insulation strength, excellent dielectric strength, excellent thermal conductivity, and excellent resistance stability. This makes them widely applicable in the heating field and able to achieve fairly high temperature control accuracy. However, in conventional thermal control implementation work, it is usually necessary to arrange temperature measuring elements, such as PT100, thermocouples, and thermistors, to measure the temperature of the thin-film heater. However, in actual use, this method has some drawbacks, such as: (1) the temperature measuring elements are arranged near the thin-film heater, the temperature measurement is inaccurate, and it may even cause the heater to overheat and fail; (2) arranging temperature measuring elements separately greatly reduces the production efficiency of thermal control implementation work and affects the progress of subsequent work. Therefore, in the existing technology, temperature sensing elements or temperature control switches are directly installed on the thin-film heater for temperature measurement and control, such as in the patent document with publication number CN202738131U. In order to ensure the overall insulation and protection of the heater, the temperature sensing elements need to be protected. Usually, a protective shell is set to protect the temperature sensing elements. In order to prevent the contact points of the temperature sensing elements from being oxidized by high temperature, glue needs to be injected into the protective shell to improve the protection. However, during glue injection, the glue is easy to overflow from the gaps and temperature sensing lines, which affects the processing.

[0003] Therefore, a temperature-sensing thin-film heater is needed to solve the above problems. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section, some embodiments of this application provide a temperature-sensing thin-film heater, comprising: a thin-film body on which a temperature-sensing device is mounted; and a protective shell mounted on the thin-film body to protect the temperature-sensing device and form a glue-filling space. The thin-film body includes: a first insulating film, a heating wire, and a second insulating film distributed sequentially from top to bottom. The heating wire is pressed between the second insulating film and the first insulating film. The heating wire is connected to a heating wire, which is electrically connected to the heating wire. The heating wire is distributed in a serpentine pattern on the upper surface of the second insulating film. The upper surface of the second insulating film has an installation area, where the heating wire is not distributed. The temperature-sensing device is mounted in the installation area, and a welding pin is also provided in the installation area. The temperature-sensing device is electrically connected to the welding pin, and a temperature-sensing wire is connected to the welding pin. The temperature-sensing wire is electrically connected to the temperature-sensing device through the welding pin.

[0006] The temperature measuring device is located in the middle area of ​​the thin film body. The temperature measuring device can measure the temperature of the thin film body, avoiding inaccurate temperature measurement. The protective shell can protect the temperature measuring device and prevent it from affecting the overall insulation and protection of the heater.

[0007] Furthermore, a notch is provided on the first insulating film, which is located at the installation area, so that the first insulating film does not cover the temperature measuring device and the soldering pin.

[0008] The notch is designed to protect the heating wire by the first and second insulating films when the film body is pressed together, while also preventing the temperature measuring device from being pressed between the first and second insulating films, thus avoiding wrinkles or bubbles from forming on the first and second insulating films.

[0009] Furthermore, a protective shell is provided at the notch position and covers the notch. The protective shell includes an upper shell and a lower shell located on the upper and lower sides of the film body, respectively. The upper shell and the lower shell have portions protruding from the side of the film body. The portion of the lower shell protruding from the film body is provided with two through holes. The portion of the upper shell protruding from the film body is provided with two bolt holes. Bolts passing through the through holes are installed in the bolt holes.

[0010] With the upper and lower housings configured, when the protective housing protects the temperature measuring device, the upper and lower housings are connected by bolts to cover the gap area and avoid affecting the insulation and protection.

[0011] Furthermore, a glue injection cavity is provided inside the upper housing, and the temperature measuring device and welding pin are located inside the glue injection cavity. A sealing ring groove is also provided inside the upper housing around the glue injection cavity, and a sealing rubber ring is installed in the sealing ring groove, with the sealing ring groove surrounding the outside of the notch.

[0012] When the protective shell is installed on the film body, the upper shell is located on the upper surface of the first insulating film, so that the sealing rubber ring abuts against the first insulating film and seals the glue injection cavity.

[0013] Furthermore, the upper housing has a wire hole for the temperature measuring wire to pass through, and a sealing cavity is provided inside the upper housing on one side of the glue injection cavity. The sealing cavity is located on the side of the upper housing that protrudes from the film body. A sliding plate is slidably connected inside the sealing cavity, and a sealing bladder is provided between the sliding plate and the side wall of the sealing cavity near the glue injection cavity. The temperature measuring wire passes through the sealing cavity from the glue injection cavity and exits from the temperature measuring wire. Both the sliding plate and the sealing bladder have through holes for the temperature measuring wire to pass through.

[0014] The sliding plate and sealing bladder can seal the gap where the temperature measuring wire passes through the glue injection cavity, preventing glue from overflowing from the gap during injection.

[0015] Furthermore, a second abutment block is provided on the lower housing and inserted into the sealing cavity. A first abutment block is fixedly provided on the sliding plate and abuts against the second abutment block. Both the second abutment block and the first abutment block are provided with inclined surfaces that abut against each other. When the second abutment block is inserted into the sealing cavity, the second abutment block pushes the first abutment block, causing the sliding plate to move towards the side closer to the glue injection cavity and squeeze the sealing bladder.

[0016] By using the sealing bladder and the first abutting block, when the lower housing and the upper housing are installed, the sliding plate can be pushed to squeeze the sealing bladder, so that the sealing bladder abuts against the outside of the temperature measuring wire and against the side wall of the sealing cavity, preventing glue from overflowing from the glue injection cavity into the sealing cavity, and also preventing glue from overflowing from the through hole where the temperature measuring wire passes through the side wall of the glue injection cavity.

[0017] Furthermore, the upper shell is provided with an injection hole and an air vent that extend to the injection cavity. Glue is injected into the injection cavity through the injection hole, and the air vent ensures the air pressure balance in the injection cavity.

[0018] The beneficial effects of this application are as follows:

[0019] 1. The temperature measuring device can measure the temperature of the film body, avoiding inaccurate temperature measurement. The protective shell can protect the temperature measuring device and prevent it from affecting the overall insulation and protection of the heater.

[0020] 2. The notch is designed so that the heating wire can be protected by the first insulating film and the second insulating film when the film body is pressed together. It also prevents the temperature measuring device from being pressed between the first insulating film and the second insulating film, which would cause wrinkles or bubbles to form on the first insulating film and the second insulating film.

[0021] 3. By using the sealing bladder and the first abutting block, when the lower housing and the upper housing are installed, the sliding plate can be pushed to squeeze the sealing bladder, so that the sealing bladder abuts against the outside of the temperature measuring wire and against the side wall of the sealing cavity, preventing glue from overflowing from the glue injection cavity into the sealing cavity, and also preventing glue from overflowing from the through hole where the temperature measuring wire passes through the side wall of the glue injection cavity. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0023] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0024] In the attached diagram:

[0025] Figure 1 This is an overall schematic diagram according to one embodiment of the present application;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of the thin film body in the embodiment;

[0027] Figure 3 yes Figure 1 A schematic diagram of the installation area in the embodiment;

[0028] Figure 4 yes Figure 1 A schematic diagram of the installation structure of the upper and lower housings in the embodiment;

[0029] Figure 5 yes Figure 1 A schematic diagram of the internal structure of the glue injection cavity in the embodiment;

[0030] Figure 6 yes Figure 1 The embodiment shows a schematic diagram of the installation of the sealing bladder.

[0031] Figure label:

[0032] 10. Thin film body; 11. Temperature measuring device; 12. Protective shell; 13. Heating wire; 14. Temperature measuring wire; 15. Mounting area; 16. Welding pin; 17. First insulating film; 18. Heating wire; 19. Second insulating film; 20. Upper shell; 21. Lower shell; 22. Glue injection hole; 23. Vent hole; 24. Wire hole; 25. Glue injection cavity; 26. Sealing ring groove; 27. Sealing cavity; 28. Sliding plate; 29. ​​First abutment block; 30. Sealing bladder; 31. Second abutment block; 32. Bolt; 33. Screw hole; 34. Notch. Detailed Implementation

[0033] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0034] It should also be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0035] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0036] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0037] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Reference Figure 1-6A temperature-sensing thin-film heater includes: a thin-film body 10, a temperature-sensing device 11, a protective shell 12, a heating wire 13, a mounting area 15, welding pins 16, and a temperature-sensing wire 14. The thin-film body 10 includes a first insulating film 17, a heating wire 18, and a second insulating film 19. The heating wire 18 is pressed between the first insulating film 17 and the second insulating film 19, forming a sandwich structure from top to bottom. The heating wire 18 is used for heating when energized and is connected to the heating wire 13, which is connected to a power supply. The heating wire 18 is serpentinely distributed on the upper surface of the second insulating film 19. The upper surface of the second insulating film 19 has a mounting area 15, where the heating wire 18 is not distributed. The temperature-sensing device 11 is mounted in the mounting area 15, and welding pins 16 are also provided within the mounting area 15. The temperature sensing device 11 is mounted on the thin film body 10 and located in the mounting area 15. The power-on terminal and signal output terminal of the temperature sensing device 11 are respectively soldered to the soldering pins 16. Temperature sensing wires 14 are soldered onto the soldering pins 16, and the power supply is connected and a signal is output through the temperature sensing wires 14. The number of soldering pins 16 can be adjusted according to the model of the temperature sensing device 11, which can be selected as a PT100 temperature sensor.

[0039] To ensure overall insulation and protection, a protective shell 12 is also installed on the film body 10. The protective shell 12 protects the temperature measuring device 11 and forms a glue injection space covering the temperature measuring device 11. A first insulating film 17 is formed on the first insulating film 17, facing the mounting area 15, so that the first insulating film 17 does not cover the soldering pins 16 and the temperature measuring device 11. This avoids the formation of wrinkles on the first insulating film 17 and the second insulating film 19 when the first insulating film 17, heating wire 18, and second insulating film 19 are heat-pressed together, due to the thickness of the temperature measuring device 11, and also avoids the occurrence of air bubbles. A protective shell 12 is positioned at and covers the notch 34. The protective shell 12 includes an upper shell 20 and a lower shell 21 located on the upper and lower sides of the film body 10, respectively. The upper shell 20 and the lower shell 21 have portions protruding from the sides of the film body 10. The portion of the lower shell 21 protruding from the film body 10 has two through holes, and the portion of the upper shell 20 protruding from the film body 10 has two bolt holes. Bolts 32 passing through the through holes are installed in the bolt holes 33. The upper shell 20 has a wire hole 24 for the temperature measuring wire 14 to pass through. During installation, the temperature measuring wire 14 is passed through the upper shell 20, which covers the first insulating film 17 and is located at the notch 34. At the same time, the lower shell 21 is located below the second insulating film 19. The lower shell 21 and the upper shell 20 are connected by bolts 32, so that the upper shell 20 covers the temperature measuring device 11 and the welding pin 16. When the upper shell 20 and the lower shell 21 protrude from the side of the film body 10 and abut against each other, there is a gap in the part that does not protrude from the film body 10 to accommodate the film body 10.

[0040] An injection cavity 25 is provided inside the upper housing 20. The temperature measuring device 11 and the welding pin 16 are located inside the injection cavity 25. A sealing ring groove 26 is also provided inside the upper housing 20, surrounding the injection cavity 25. A sealing rubber ring is installed in the sealing ring groove 26, with the lower end of the sealing rubber ring protruding from the sealing ring groove 26. The sealing ring groove 26 surrounds the outside of the notch 34. To prevent glue from overflowing from the gap between the upper housing 20 and the temperature measuring wire 14 during injection into the injection cavity 25, a sealing cavity 27 is provided inside the upper housing 20, located on one side of the injection cavity 25. The sealing cavity 27 is located on the side of the upper housing 20 that protrudes from the film body 10. A through hole is provided on the end wall between the injection cavity 25 and the sealing cavity 27 for the temperature measuring wire 14 to pass through. A sliding plate 28 is slidably connected inside the sealing cavity 27. A sealing bladder 30 is provided between the sliding plate 28 and the side wall of the sealing cavity 27 near the glue injection cavity 25. The temperature measuring wire 14 passes through the glue injection cavity 25, passes through the sealing cavity 27, and exits. Both the sliding plate 28 and the sealing bladder 30 have through holes for the temperature measuring wire 14 to pass through.

[0041] The lower housing 21 is provided with a second abutment block 31 that inserts into the sealing cavity 27. A first abutment block 29 that abuts against the second abutment block 31 is fixedly provided on the sliding plate 28. Both the second abutment block 31 and the first abutment block 29 have mutually abutting inclined surfaces. When the second abutment block 31 is inserted into the sealing cavity 27, it pushes the first abutment block 29, causing the sliding plate 28 to move towards the side closer to the glue injection cavity 25 and compress the sealing bladder 30. When the bolt 32 connects the lower housing 21 and the upper housing 20, the sliding plate 28 compresses the sealing bladder 30 against the side wall of the sealing cavity 27 near the glue injection cavity 25, simultaneously deforming the sealing bladder 30 to seal the gap between the temperature measuring wire 14 and the protective shell 12, preventing glue overflow. It should be noted that the sealing bladder 30 is made of rubber, similar to an inflatable sealing ring in the prior art.

[0042] The upper housing 20 has an injection hole 22 and an vent 23 that extend to the injection cavity 25. Glue is injected into the injection cavity 25 through the injection hole 22, and the vent 23 ensures that the air pressure inside the injection cavity 25 is balanced. Thermally conductive potting compound can be used for injection.

[0043] Working process or usage method:

[0044] 1. After pressing the first insulating film 17, heating wire 18, and second insulating film 19 together, the temperature measuring device 11 is bonded and installed in the installation area 15. The power-on terminal and signal output terminal of the temperature measuring device 11 are soldered to the soldering pins 16 respectively. At this time, the temperature measuring wire 14 is passed out of the upper housing 20 through the wire hole 24 from the glue injection cavity 25. The temperature measuring wire 14 will pass through the through hole of the sealing bag 30 and the sliding plate 28. The upper housing 20 is adjusted to be above the first insulating film 17 and located at the notch 34. The lower housing 21 is placed below the second insulating film 19 and directly opposite the upper housing 20. The upper housing 20 and the lower housing 21 are connected by bolts 32. At this time, the second abutment block 31 will be inserted into the sealing cavity 27.

[0045] 2. When the second abutting block 31 abuts against the first abutting block 29 and pushes the sliding plate 28 to squeeze the sealing bladder 30, the sealing bladder 30 abuts against the side wall of the sealing cavity 27 and is fitted with the sealing temperature measuring wire 14 to prevent glue from overflowing from the glue injection cavity 25. After the upper shell 20 and the lower shell 21 are installed, the rubber sealing ring abuts against the first insulating film 17 and cooperates with the sealing bladder 30 to prevent glue from overflowing from the glue injection cavity 25. At this time, glue is injected into the installation area 15 through the glue injection hole 22 to ensure overall insulation and protection.

[0046] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the application involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A temperature measuring thin film heater characterized by ,include: A thin film body (10) is provided, and a temperature measuring device (11) is installed on the thin film body (10); A protective shell (12) is installed on the film body (10) to protect the temperature measuring device (11) and form a glue injection space; The thin film body (10) includes: The first insulating film (17), heating wire (18), and second insulating film (19) are arranged sequentially from top to bottom. The heating wire (18) is pressed between the second insulating film (19) and the first insulating film (17). The heating wire (18) is connected to a heating wire (13), which is electrically connected to the heating wire (18). The heating wire (18) is distributed in a serpentine manner on the upper surface of the second insulating film (19). The upper surface of the second insulating film (19) has an installation area (15). The heating wire (18) is not distributed in the installation area (15). The temperature measuring device (11) is installed in the installation area (15). The installation area (15) is also provided with a welding pin (16). The temperature measuring device (11) is electrically connected to the welding pin (16). A temperature measuring wire (14) is connected to the welding pin (16). The temperature measuring wire (14) is electrically connected to the temperature measuring device (11) through the welding pin (16).

2. The temperature-measuring thin-film heater according to claim 1, characterized in that: The first insulating film (17) has a notch (34) located in the mounting area (15). The notch (34) prevents the first insulating film (17) from covering the temperature measuring device (11) and the soldering pin (16).

3. A temperature-measuring thin-film heater according to claim 2, characterized in that: The protective shell (12) is set at the notch (34) and covers the notch (34). The protective shell (12) includes an upper shell (20) and a lower shell (21) located on the upper and lower sides of the film body (10). The upper shell (20) and the lower shell (21) have portions protruding from the side of the film body (10). The portion of the lower shell (21) protruding from the film body (10) is provided with two through holes. The portion of the upper shell (20) protruding from the film body (10) is provided with two bolt holes. The bolt holes (33) are fitted with bolts (32) that pass through the through holes.

4. A temperature-measuring thin-film heater according to claim 3, characterized in that: The upper housing (20) has a glue injection cavity (25) inside, the temperature measuring device (11) and the welding pin (16) are located in the glue injection cavity (25), and the upper housing (20) also has a sealing ring groove (26) arranged around the glue injection cavity (25), a sealing rubber ring is installed in the sealing ring groove (26), and the sealing ring groove (26) surrounds the outside of the notch (34).

5. A temperature-measuring thin-film heater according to claim 4, characterized in that: The upper housing (20) has a wire hole (24) for the temperature measuring wire (14) to pass through. The upper housing (20) has a sealing cavity (27) located on one side of the glue injection cavity (25). The sealing cavity (27) is located on the side of the upper housing (20) that protrudes from the film body (10). A sliding plate (28) is slidably connected in the sealing cavity (27). A sealing bladder (30) is provided between the sliding plate (28) and the side wall of the sealing cavity (27) near the glue injection cavity (25). The temperature measuring wire (14) passes through the sealing cavity (27) from the glue injection cavity (25) and exits from the sealing cavity (27). Both the sliding plate (28) and the sealing bladder (30) have through holes for the temperature measuring wire (14) to pass through.

6. A temperature-measuring thin-film heater according to claim 5, characterized in that: The lower housing (21) is provided with a second abutting block (31) that is inserted into the sealing cavity (27). The sliding plate (28) is fixedly provided with a first abutting block (29) that abuts against the second abutting block (31). Both the second abutting block (31) and the first abutting block (29) are provided with inclined surfaces that abut against each other. When the second abutting block (31) is inserted into the sealing cavity (27), the second abutting block (31) pushes the first abutting block (29) to make the sliding plate (28) move towards the side closer to the glue injection cavity (25) and squeeze the sealing bladder (30).

7. A temperature-measuring thin-film heater according to claim 4, characterized in that: The upper housing (20) is provided with an injection hole (22) and an air outlet (23) that extend to the injection cavity (25). Glue is injected into the injection cavity (25) through the injection hole (22), and the air pressure in the injection cavity (25) is balanced through the air outlet (23).

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