Heating device

Abstract

The invention discloses a heating device which is characterized in that a heating wire comprises an insulating core, a heating wire and an outer insulator, the insulating core is coated with the outer insulator, and the heating wire is arranged between the insulating core and the outer insulator. Through the arrangement of the structure, after electrification, the heating wire is heated to form a heating area, then heat is transmitted to the outer insulator, the first face makes contact with a packaging bag needing to be sealed, the outer insulator transmits the heat to the packaging bag through the first face, and the distance between the second face and the heating wire in the longitudinal direction is larger than that between the first face and the heating wire in the longitudinal direction. More heat can be concentrated on the first surface, so that the heat transferred to the part which does not need to be heated is reduced; meanwhile, when the heating wire is manufactured, the main body part of the heating wire is manufactured firstly, and then the heating wire with the corresponding length is cut according to the requirement and then is crimped, so that the manufacturing process of the heating device is simplified, and most use requirements can be met.

Description

Technical Field

[0001] The invention relates to a heating device, in particular to a heating wire and a heating device. Background Art

[0002] Sealing machines are mainly used to seal packaging bags. They are widely used in food, medicine, cosmetics and other fields. They can provide a strong sealing effect to ensure that the products remain intact during transportation and storage. The heating element is a key component of the sealing machine to achieve the sealing of packaging bags. Common heating elements include heating wires, ceramic heating plates, infrared heaters, etc. Among them, the cost of heating wires is low, and the manufacturing process and installation process are simple. Therefore, using heating wires as heating elements in sealing machines is the first choice of more manufacturers and consumers.

[0003] In the prior art, the insulating material wrapped around the heating wire is relatively complex, and some are even multi-layered, and the spacing between the heating wire and the outer insulator is set the same. When the heating device is placed in the sealing machine, when the heating wire works at high temperature, the installation position of the heating device will also heat up, and the heat generated may affect the life of the sealing machine.

[0004] To this end, the present invention provides a heating device that can effectively solve the above problems, has a simple structure, is easy to manufacture, and has wide applicability. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a heating device which has a simple structure, is easy to manufacture and has wide applicability.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A heating device, characterized in that it comprises:

[0008] A heating wire comprises an insulating core, a heating wire and an outer insulator, wherein the outer insulator covers the insulating core, and the heating wire is arranged between the insulating core and the outer insulator.

[0009] As an improvement of the present invention, the outer insulator includes a first surface and a second surface opposite to each other, and the distance between the first surface and the heating wire in the longitudinal direction is smaller than the distance between the second surface and the heating wire in the longitudinal direction.

[0010] As an improvement of the present invention, the second surface is provided with a plurality of marks, and the marks are used to indicate the installation position of the heating device.

[0011] As an improvement of the present invention, the heating wire is wound on the insulating core in a spiral shape.

[0012] As an improvement of the present invention, the insulating core is Teflon silica gel or glass fiber.

[0013] As an improvement of the present invention, the outer insulator is silica gel.

[0014] As an improvement of the present invention, the following steps are included:

[0015] S1: Provide a heating wire, comprising: an insulating core, a heating wire and an outer insulator, wherein the outer insulator covers the insulating core, and the heating wire is arranged between the insulating core and the outer insulator;

[0016] S2: measuring and cutting the heating wire;

[0017] S3: stripping off the outer insulator at the end of the heating wire to expose the heating wire and the insulating core inside;

[0018] S4: providing a wire, stripping off the insulation layer at the end of the wire to expose the conductor inside;

[0019] S5: Provide a tension spring, the tension spring comprising a straight end and a hook end, and provide a terminal; insert the heating wire, the conductor, the straight end, the insulating core and the outer insulator into the terminal respectively, and crimp and fix them.

[0020] As an improvement of the present invention, in step S5, the terminal includes a first partition, a second partition and a third partition, and the heating wire, the conductor, the straight end, the insulating core and the outer insulator are respectively located in different partitions.

[0021] As an improvement of the present invention, step S5 includes the following steps:

[0022] S51: inserting the outer insulator into the first partition and crimping and fixing it.

[0023] S52: inserting the heating wire, the conductor and the insulating core into the second partition and crimping and fixing them.

[0024] S53: inserting the conductor and the straight end into the third partition and crimping and fixing them.

[0025] As an improvement of the present invention, in step S5, the terminal is a copper strip.

[0026] The beneficial effects of the present invention are as follows: through the arrangement of the above-mentioned structure, after power is turned on, the heating wire heats up to form a heating area, and then transfers heat to the outer insulator, the first surface contacts the packaging bag to be sealed, and the outer insulator transfers heat to the packaging bag through the first surface, and the longitudinal distance between the second surface and the heating wire is greater than the longitudinal distance between the first surface and the heating wire, which can ensure that more heat is concentrated on the first surface and reduce the heat transfer to the part that does not need to be heated; at the same time, when making the heating wire, the main part of the heating wire is first made, and then the heating wire is cut into corresponding lengths as needed and then crimped, which simplifies the manufacturing process of the heating device and can meet most usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention from an angle;

[0030] Figure 2 yes Figure 1 Enlarged view of circle A;

[0031] Figure 3 is a schematic diagram of the overall structure of the first embodiment of the present invention from another angle;

[0032] Figure 4 is a schematic cross-sectional view of a first embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0034] Figure 6 yes Figure 5 Enlarged view of circle B;

[0035] Figure 7 is a schematic cross-sectional structural diagram of a second embodiment of the present invention;

[0036] Figure 8 is a schematic cross-sectional view of a third embodiment of the present invention;

[0037] Fig. 9 It is a schematic diagram of the overall steps of the method of the present invention;

[0038] Fig.10It is a detailed step flow diagram of step S5 of the method of the present invention.

[0039] Description of reference numerals:

[0040] 10. Insulating core; 20. Heating wire; 30. External insulator; 31. First side; 32. Second side; 33. Mark; 40. Terminal; 41. First partition; 42. Second partition; 43. Third partition; 50. Wire; 51. Conductor; 60. Tension spring; 61. Straight end; 62. Hook end. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0047] Reference Figures 1 to 8 , a heating device, characterized in that it comprises:

[0048] The heating wire comprises an insulating core 10 , a heating wire 20 and an outer insulator 30 . The outer insulator 30 covers the insulating core 10 , and the heating wire 20 is arranged between the insulating core 10 and the outer insulator 30 .

[0049] By setting the above structure, the heating wire 20 is set between the two insulating materials to ensure the working efficiency of the heating wire 20, reduce the heat loss in the direction where heating is not required, thereby concentrating the heat output and dissipating the heat evenly. The insulating core 10 and the outer insulator 30 can effectively isolate the direct contact between the heating wire 20 and the external conductor, avoid possible short circuit or other electrical failures, and enhance the reliability of the system.

[0050] In this embodiment, the outer insulator 30 includes a first surface 31 and a second surface 32 that are opposite to each other, and the longitudinal distance between the first surface 31 and the heating wire 20 is smaller than the longitudinal distance between the second surface 32 and the heating wire 20. With the arrangement of the above structure, after power is turned on, the heating wire 20 heats up to form a heating area, and the heating wire 20 transfers heat to the outer insulator 30. The first surface 31 contacts the packaging bag to be sealed, and the outer insulator 30 transfers heat to the packaging bag through the first surface 31. After the packaging bag reaches an appropriate temperature, it begins to melt and combine together to complete the sealing process. In the first and second embodiments, the longitudinal distance between the second surface 32 and the heating wire 20 is larger than the longitudinal distance between the first surface 31 and the heating wire 20, such as Figure 4 and Figure 7 As shown, by making the distance between the first surface 31 and the heating wire 20 smaller, more heat can be concentrated on the first surface 31, reducing the heat transfer to the part that does not need to be heated; the larger distance provides better heat dissipation conditions for the second surface 32, thereby improving the safety of the sealing machine. This design reduces the heat loss of the heating wire 20, improves the sealing efficiency of the sealing machine, extends the service life of the sealing machine, and is more energy-saving, economical and environmentally friendly. In the third embodiment, from the overall appearance of the heating wire, there is no difference between the second embodiment and the third embodiment. However, as Figure 8 As shown, there is no difference in the spacing between the heating wire 20 and each surface of the outer insulator 30, and the heating efficiency of each surface is the same. Manufacturers and consumers can choose appropriate heating wires according to different usage scenarios.

[0051] In this embodiment, the second surface 32 is provided with a plurality of marks 33, and the marks 33 are used to indicate the installation position of the heating device. Figure 1 and Figure 4 As shown, there are several marks 33 on the second side 32. The second side 32 is far away from the heating wire 20 in the longitudinal direction and has no contact with the packaging bag to be sealed. The second side 32 is placed in the sealing machine as an installation position. When the sealing machine is working, the heating wire 20 receives the current from the wire 50 and then starts to work and heat up, forming a heating area. The design of the second side 32 away from the heating wire 20 ensures that the installation position where the heating wire contacts the sealing machine will not be damaged due to the increase in temperature. Preferably, the outer insulator 30 is recessed inward on the second side 32 to form the mark 33, that is, the mark 33 is embedded in the second side 32, and the mark 33 can be formed without additional processes.

[0052] In this embodiment, the heating wire 20 is wound on the insulating core 10 in a spiral shape. Through the above-mentioned structure, the heating wire 20 is wound on the insulating core 10 in a spiral shape, which can achieve a larger heating area or more efficient heat generation in a limited space; such a design can save space and effectively utilize the length of the insulating core 10. The closely arranged spiral heating wires 20 can reduce heat loss and transfer heat to the required area more concentratedly, thereby improving the heating efficiency of the entire heating wire. Optionally, the heating wire 20 can be a nickel-chromium alloy wire, a copper-nickel alloy wire, a tungsten wire, a molybdenum wire, a platinum wire, a copper-aluminum alloy wire, a nickel-aluminum alloy, and the like.

[0053] In this embodiment, the insulating core 10 is Teflon silicone or glass fiber. Through the above-mentioned structure, Teflon silicone combines the advantages of Teflon and silicone. The addition of Teflon makes Teflon silicone have excellent chemical corrosion resistance and is almost unaffected by most chemicals; the characteristics of silicone give Teflon silicone good flexibility and elasticity, and it can maintain excellent characteristics even at extremely high temperatures, which is very important for applications where the heating wire is bent or deformed. Teflon and silicone both have good electrical insulation properties, can maintain their own stable performance in a large temperature range, and still have excellent performance when the sealing machine is working. These advantages make Teflon silicone an ideal choice for the insulating core 10 of the heating wire. Similarly, glass fiber has good high temperature tolerance and electrical insulation, can withstand the high temperature generated when the heating wire is working without decomposition or melting, and good electrical insulation properties can effectively prevent current leakage and ensure the safety of users. In addition, glass fiber is also easy to bend and easy to shape, which can meet different production requirements. Optionally, the insulating core 10 can also be other insulating materials, such as PVC, ceramics, mica, silicone rubber, polyimide, etc.

[0054] In this embodiment, the outer insulator 30 is silica gel. Through the above-mentioned structure, the waterproof performance and sealing ability of silica gel enable the outer insulator 30 to effectively prevent moisture intrusion, protect the internal components from moisture, and improve the overall safety and reliability of the heating wire; silica gel can tightly wrap the heating wire 20 and the insulating core 10, and has a tight sealing effect to prevent moisture and other pollutants from entering the interior. At the same time, silica gel is a non-toxic and odorless material that meets the standards of food contact and medical equipment, ensuring the safety of sealing food packaging bags. In addition, silica gel can maintain stable performance over a large temperature range, even in the process of high-temperature heating of the heating wire, which is the basic advantage of silica gel itself. Silicone also has good flexibility and ductility, and can be bent. Even if the heating wire is bent due to improper use, it will not affect the overall function of the heating wire. Optionally, the outer insulator 30 can also be other insulating materials, such as PVC, glass fiber, ceramic, mica, silicone rubber, polyimide, etc.

[0055] Reference Figures 9 and 10 , a method for manufacturing a heating device, comprising the following steps:

[0056] S1: A heating wire is provided, comprising: an insulating core 10, a heating wire 20 and an outer insulator 30, wherein the outer insulator 30 covers the insulating core 10, and the heating wire 20 is arranged between the insulating core 10 and the outer insulator 30.

[0057] S2: Measure and cut the heating wire. Measure the required length of the heating wire according to the size of the sealing machine or the target device, and mark the position where it needs to be cut. When measuring, a certain distance needs to be reserved for subsequent processing of the end of the heating wire. According to the measurement results, use a cutting tool to cut the heating wire, ensuring that it is completely aligned with the previously marked line. When cutting, it is necessary to pay attention to maintaining the flatness of the cutting surface. The insulating core 10, the heating wire 20 and the outer insulator 30 should be cut on the same plane to avoid any tilted or irregular cutting.

[0058] S3: Strip the outer insulator 30 at the end of the heating wire to expose the internal heating wire 20 and the insulating core 10. Use a wire stripping tool to strip the outer insulator 30 according to the reserved distance. Carefully check the area after stripping the outer insulator 30 to ensure that the internal heating wire 20 and the insulating core 10 are not damaged.

[0059] S4: Provide a wire 50, strip off the insulation layer at the end of the wire 50, and expose the internal conductor 51. Determine the length of the insulation layer of the wire 50 to be stripped according to the structure of the wire 50, and use a wire stripping tool to strip the insulation layer of the wire 50. After stripping the insulation layer of the wire 50, carefully check the exposed conductor 51 to ensure that the conductor 51 is not damaged and can be used normally.

[0060] S5: Provide a tension spring 60, the tension spring 60 includes a straight end 61 and a hook end 62, and provide a terminal 40; insert the heating wire 20, the conductor 51, the straight end 61, the insulating core 10 and the outer insulator 30 into the terminal 40 respectively, and crimp and fix them. Fix the heating wire 20 and the conductor 51 to the terminal 40 by mechanical crimping to ensure good electrical contact and mechanical stability. Accurately inserting the heating wire 20 and the conductor 51 into the terminal 40 for crimping and fixing is a key step to realize the heating function of the heating wire.

[0061] In this embodiment, in step S5, the terminal 40 includes a first partition 41, a second partition 42 and a third partition 43, and the heating wire 20, the conductor 51, the straight end 61, the insulating core 10 and the outer insulator 30 are respectively located in different partitions. By setting the above structure, the terminal 40 is divided into different partitions, and the components that need to be crimped can be fixed in the partitions, and each partition can be crimped according to a specific component. The three partitions have different sizes and structures, and different components are fixed according to the specific structure to improve the current transmission efficiency of the heating wire 20 and the conductor 51.

[0062] In this embodiment, step S5 includes:

[0063] S51: insert the outer insulator 30 into the first partition 41 and perform crimping and fixing. Because the outer insulator 30 has a certain thickness, by fixing the outer insulator 30 to the first partition 41 of the terminal 40, the crimping and fixing of the entire terminal 40 can be made more secure; at the same time, the outer insulator 30 can form additional insulation protection for the crimping of the second partition 42, further preventing the occurrence of short circuits and other electrical faults.

[0064] S52: Insert the heating wire 20, the conductor 51 and the insulating core 10 into the second partition 42 and crimp them. The conductor 51 is the key to current transmission. The conductor 51, the heating wire 20 and the insulating core 10 are fixed to the second partition 42 in the middle of the terminal 40 to ensure that the connection position between the heating wire 20 and the conductor 51 has sufficient mechanical strength and good conductivity. The heating wire 20 is spirally wound on the insulating core 10 and fixed in the second partition 42, and the conductor 51 is also fixed in the second partition 42, which can increase the contact area between the heating wire 20 and the conductor 51 and increase the efficiency of current transmission from the conductor 51 to the heating wire 20.

[0065] S53: Insert the conductor 51 and the straight end 61 into the third partition 43 and crimp them to fix. The third partition 43 is in an 8-shaped structure, consisting of two interconnected semi-annular parts, one of which allows the conductor 51 to pass through, and the other allows the straight end 61 to pass through. The straight end 61 is crimped and fixed in the third partition 43 to facilitate the hook end 62 to fix the heating device to the installation position of the sealing machine or other target equipment; at the same time, the tension spring 60 also provides a certain deformation space to prevent damage to the heating wire due to excessive stretching or compression, and also allows the sealing machine to make full use of the heating area of ​​the heating wire. In addition, because the wire 50 generates current and requires electrical connection, the conductor 51 passes through the second partition 42 and the third partition 43 and then passes through the terminal 40 to connect to the power supply.

[0066] In this embodiment, the terminal 40 is a copper strip. Through the above-mentioned structure, copper has a very low resistivity and can effectively transmit current to the heating wire 20. Copper with low resistivity can effectively reduce energy loss and improve heating efficiency. Copper, as an excellent electrical conductor, can ensure that the wire 50 stably transmits current to the heating wire 20, which is crucial to maintaining the working temperature of the heating wire 20. Optionally, the terminal 40 can also be other metals, such as copper-zinc alloy, tin-plated copper, silver-plated copper, nickel-plated metal, etc. When selecting the material of the terminal 40, it is necessary to consider that the terminal 40 not only acts as a power terminal in addition to crimping and fixing.

[0067] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. A heating device, characterized in that: include: A heating wire comprises an insulating core (10), a heating wire (20) and an outer insulator (30), wherein the outer insulator (30) covers the insulating core (10), and the heating wire (20) is arranged between the insulating core (10) and the outer insulator (30).

2. The heating device according to claim 1, characterized in that: The outer insulator (30) comprises a first surface (31) and a second surface (32) which are opposite to each other, and the longitudinal distance between the first surface (31) and the heating wire (20) is smaller than the longitudinal distance between the second surface (32) and the heating wire (20).

3. The heating device according to claim 2, characterized in that: The second surface (32) is provided with a plurality of marks (33), and the marks (33) are used to indicate the installation position of the heating device.

4. The heating device according to claim 1, characterized in that: The heating wire (20) is wound in a spiral shape on the insulating core (10).

5. The heating device according to claim 1, characterized in that: The insulating core (10) is Teflon silica gel or glass fiber.

6. The heating device according to claim 1, characterized in that: The outer insulator (30) is silica gel.

7. A method for manufacturing a heating device, characterized in that: The following steps are involved: S1: A heating wire is provided, comprising: an insulating core (10), a heating wire (20) and an outer insulator (30), wherein the outer insulator (30) covers the insulating core (10), and the heating wire (20) is arranged between the insulating core (10) and the outer insulator (30); S2: measuring and cutting the heating wire; S3: stripping off the outer insulator (30) at the end of the heating wire to expose the heating wire (20) and the insulating core (10) inside; S4: providing a wire (50), stripping off the insulation layer at the end of the wire (50) to expose the conductor (51) inside; S5: Provide a tension spring (60), wherein the tension spring (60) includes a straight end (61) and a hook end (62), and provide a terminal (40); insert the heating wire (20), the conductor (51), the straight end (61), the insulating core (10) and the outer insulator (30) into the terminal (40) respectively, and crimp and fix them.

8. The method for manufacturing a heating device according to claim 7, characterized in that: In step S5, the terminal (40) includes a first partition (41), a second partition (42) and a third partition (43), and the heating wire (20), the conductor (51), the straight end (61), the insulating core (10) and the outer insulator (30) are respectively located in different partitions.

9. The method for manufacturing a heating device according to claim 8, wherein step S5 comprises: S51: inserting the outer insulator (30) into the first partition (41) and crimping and fixing it; S52: inserting the heating wire (20), the conductor (51) and the insulating core (10) into the second partition (42) and crimping and fixing them; S53: inserting the conductor (51) and the straight end (61) into the third partition (43) and crimping and fixing them.

10. The method for manufacturing a heating device according to claim 7, wherein in step S5, the terminal (40) is a copper strip.

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