Heating elements and heating equipment

Abstract

This utility model discloses a heating tube and a heating device. The heating tube includes an insulating ceramic tube, a conductive heating layer, and a temperature control switch. A heating channel is formed inside the insulating ceramic tube, and a mounting position is provided on the outer surface of the insulating ceramic tube. The conductive heating layer is disposed on the outer surface of the insulating ceramic tube and includes a heating film layer and at least two wiring portions. The wiring portions are electrically connected to the heating film layer, and the conductive heating layer is disposed away from the mounting position. The temperature control switch is disposed at the mounting position and spaced apart from the conductive heating layer. This utility model can reduce the molding difficulty and production cost of the heating tube, and effectively reduce the temperature when the heating tube is abnormally dry-burned.

Description

Technical Field

[0001] This utility model relates to the field of electric heating technology, and in particular to a heating tube and a heating device. Background Technology

[0002] In heating equipment, to prevent the heating tube from burning dry and causing equipment damage, fire and other safety accidents, a temperature control switch is usually installed on the heating tube. However, in some heating tubes with ceramic as the base material, due to the low coefficient of thermal expansion of the ceramic base material, it is difficult to match an insulating film with a corresponding coefficient of thermal expansion on the surface of the heating film after the heating film layer is made. Furthermore, the surface of the heating film layer is conductive, so it is impossible to directly place the temperature control switch on the surface of the heating film layer, making the production of heating tubes difficult. Utility Model Content

[0003] The main purpose of this invention is to provide a heating tube that facilitates production and assembly.

[0004] To achieve the above objectives, the heating tube proposed in this utility model includes:

[0005] An insulating ceramic tube, wherein a heating channel is formed inside the insulating ceramic tube, and a mounting position is provided on the outer surface of the insulating ceramic tube;

[0006] A conductive heating layer is disposed on the outer surface of the insulating ceramic tube. The conductive heating layer includes a heating film layer and at least two wiring portions, the wiring portions being electrically connected to the heating film layer. The conductive heating layer is disposed away from the mounting position.

[0007] A temperature control switch is located at the mounting position and spaced apart from the conductive heating layer.

[0008] Optionally, the insulating ceramic tube is a silicon nitride ceramic tube.

[0009] Optionally, the mounting position is in the form of an elongated strip extending along the length of the insulating ceramic tube.

[0010] Optionally, the mounting position extends from one end of the conductive heating layer to the other end.

[0011] Optionally, a plurality of the wiring portions are spaced apart along the length of the insulating ceramic tube.

[0012] Optionally, the number of the wiring terminals is two, and the heating film layer is located between the two wiring terminals; or, the number of the wiring terminals is not less than three, and the heating film layer is provided between any two adjacent wiring terminals.

[0013] Optionally, the wiring portion is in the form of a ring extending circumferentially along the insulating ceramic tube.

[0014] Optionally, the wiring portion is spaced apart from the end face of the insulating ceramic tube to form a fixed position.

[0015] This utility model also proposes a heating device, including a device body and a heating tube. The heating tube includes an insulating ceramic tube, a conductive heating layer, and a temperature control switch. A heating channel is formed inside the insulating ceramic tube, and a mounting position is provided on the outer surface of the insulating ceramic tube. The conductive heating layer is disposed on the outer surface of the insulating ceramic tube, and the conductive heating layer includes a heating film layer and at least two wiring portions. The wiring portions are electrically connected to the heating film layer, and the conductive heating layer is disposed away from the mounting position. The temperature control switch is disposed at the mounting position and spaced apart from the conductive heating layer. The device body is provided with a fluid delivery channel, and the fluid delivery channel is connected to the heating channel of the heating tube.

[0016] Optionally, the heating device is a water heater or a hot air blower.

[0017] This invention provides a mounting position on the outer surface of an insulating ceramic tube, allowing the conductive heating layer to bypass the mounting position. Since the mounting position itself is non-conductive, the temperature control switch can be directly placed there, avoiding the need to install an insulating layer outside the conductive heating layer before installing the temperature control switch. This simplifies the installation of the temperature control switch and the production and assembly of the heating tube, reducing the molding difficulty and production cost. Furthermore, the separation between the temperature control switch and the conductive heating layer prevents heat generated by the conductive heating layer from directly transferring to the temperature control switch, extending the lifespan of the temperature control switch's contact spring. The temperature control switch's tripping temperature is also significantly reduced, effectively lowering the temperature during abnormal dry burning of the heating tube and improving safety. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the heating tube of this utility model;

[0020] Figure 2 This is a schematic diagram of another embodiment of the heating tube of this utility model.

[0021] Explanation of icon numbers:

[0022] 10. Insulating ceramic tube; 11. Heating channel; 12. Mounting position; 13. Fixing position; 20. Conductive heating layer; 21. Heating film layer; 22. Wiring part; 30. Temperature control switch.

[0023] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

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

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] This utility model proposes a heating tube.

[0028] In the embodiments of this utility model, such as Figure 1 As shown, the heating tube includes an insulating ceramic tube 10, a conductive heating layer 20, and a temperature control switch 30. A heating channel 11 is formed inside the insulating ceramic tube 10, and a mounting position 12 is provided on the outer surface of the insulating ceramic tube 10. The conductive heating layer 20 is disposed on the outer surface of the insulating ceramic tube 10. The conductive heating layer 20 includes a heating film layer 21 and at least two wiring portions 22. The wiring portions 22 are electrically connected to the heating film layer 21. The conductive heating layer 20 is disposed away from the mounting position 12. The temperature control switch 30 is disposed at the mounting position 12 and spaced apart from the conductive heating layer 20.

[0029] Specifically, during production, a conductive heating layer 20 can be formed on the outer surface of the insulating ceramic tube 10 first, and then a laser or other equipment can be used to remove the conductive heating layer 20 from the corresponding area on the outer surface of the insulating ceramic tube 10 to form the mounting position 12; alternatively, the mounting position 12 can be avoided directly when forming the conductive heating layer 20 (i.e., the conductive heating layer 20 is only formed in the area outside the mounting position 12). The specific composition and forming method of the conductive heating layer 20 (such as the vapor deposition method) can refer to the prior art, and will not be described in detail in this utility model.

[0030] The number of mounting positions 12 can be one or more. When there are multiple mounting positions 12, the multiple mounting positions 12 are distributed at intervals along the circumference of the insulating ceramic tube 10 or at intervals along the length of the insulating ceramic tube 10. In addition, an insulating layer can be provided outside the conductive heating layer 20, or an insulating film can be provided outside the heating tube.

[0031] This invention provides a mounting position 12 on the outer surface of the insulating ceramic tube 10, allowing the conductive heating layer 20 to be positioned away from the mounting position 12. Since the mounting position 12 itself is non-conductive, the temperature control switch 30 can be directly placed there, avoiding the need to install an insulating layer outside the conductive heating layer 20 before installing the temperature control switch 30. This simplifies the installation of the temperature control switch 30 and the production and assembly of the heating tube, reducing the molding difficulty and production cost. Furthermore, the separation between the temperature control switch 30 and the conductive heating layer 20 prevents heat generated by the conductive heating layer 20 from being directly transferred to the temperature control switch 30, extending the lifespan of the temperature control switch 30's contact spring. The starting temperature of the temperature control switch 30 is also significantly reduced, effectively lowering the temperature during abnormal dry burning of the heating tube and improving safety.

[0032] In some embodiments, the insulating ceramic tube 10 is a silicon nitride ceramic tube, that is, the insulating ceramic tube 10 is made of silicon carbide material, which makes the insulating ceramic tube 10 have good resistance to thermal shock.

[0033] In some embodiments, the mounting position 12 is an elongated strip extending along the length of the insulating ceramic tube 10, which facilitates the installation of the temperature control switch 30. Optionally, the mounting position 12 extends from one end of the conductive heating layer 20 to the other end.

[0034] In some embodiments, a plurality of wiring portions 22 are spaced apart along the length of the insulating ceramic tube 10. This allows the heating film layer 21 to be evenly distributed between adjacent wiring portions 22 and at positions other than the mounting position 12, simplifying the structure of the heating film layer 21 and reducing the difficulty of molding the heating film layer 21.

[0035] In some embodiments, the number of wiring portions 22 is two, and the heating film layer 21 is located between the two wiring portions 22; or, the number of wiring portions 22 is not less than three (see reference). Figure 2 A heating film layer 21 is provided between any two adjacent wiring sections 22. The number of wiring sections 22 can be selected according to actual needs. When there are two wiring sections 22, the heating tube is a single-segment heating element with a simple structure. When there are three or more wiring sections 22, the heating tube is a multi-segment heating element.

[0036] In some embodiments, the wiring portion 22 is in the form of a ring extending circumferentially along the insulating ceramic tube 10, which can improve the contact effect between the wiring portion 22 and the heating film layer 21, ensure electrical conductivity reliability, and improve the reliability of the heating tube.

[0037] In some embodiments, the wiring portion 22 is spaced apart from the end face of the insulating ceramic tube 10 to form a fixing position 13, that is, the heating tube can be fixed on the fixing structure of the heating device through the fixing position 13, which facilitates the installation of the heating tube.

[0038] This utility model also proposes a heating device, which includes a device body and a heating tube. The specific structure of the heating tube is as described in the above embodiments. Since this heating device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The device body is provided with a fluid delivery channel, which is connected to the heating channel 11 of the heating tube.

[0039] Alternatively, the heating device may be a water heater or a hot air blower.

[0040] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A heating tube, characterized by, include: An insulating ceramic tube, wherein a heating channel is formed inside the insulating ceramic tube, and a mounting position is provided on the outer surface of the insulating ceramic tube; A conductive heating layer is disposed on the outer surface of the insulating ceramic tube. The conductive heating layer includes a heating film layer and at least two wiring portions, the wiring portions being electrically connected to the heating film layer. The conductive heating layer is disposed away from the mounting position. A temperature control switch is located at the mounting position and spaced apart from the conductive heating layer.

2. The heating tube of claim 1 wherein, The insulating ceramic tube is a silicon nitride ceramic tube.

3. The heating tube of claim 1 wherein, The mounting position is a long strip extending along the length of the insulating ceramic tube.

4. The heating tube of claim 3 wherein, The mounting position extends from one end of the conductive heating layer to the other end.

5. The heating tube as described in claim 1, characterized in that, The plurality of the wiring portions are spaced apart along the length of the insulating ceramic tube.

6. The heating tube of claim 5 wherein, The number of the wiring terminals is two, and the heating film layer is located between the two wiring terminals; or, the number of the wiring terminals is not less than three, and the heating film layer is provided between any two adjacent wiring terminals.

7. The heating tube according to any one of claims 1 to 6, wherein The wiring portion is in the form of a ring extending circumferentially along the insulating ceramic tube.

8. The heating tube of claim 1 wherein, The wiring portion is spaced apart from the end face of the insulating ceramic tube to form a fixed position.

9. A heating device, characterized by The device includes a main body and a heating tube as described in any one of claims 1 to 8, wherein the main body is provided with a fluid delivery channel, and the fluid delivery channel is connected to the heating channel of the heating tube.

10. The heating apparatus of claim 9, wherein, The heating device is a water heater or a hot air blower.

Images