Electric heating element integrated with thermocouple

Abstract

The utility model belongs to the technical field of electric heaters, and particularly discloses an electric heating element integrated with a thermocouple, which comprises a metal tube, an installation space is arranged in the metal tube, and an insulation sleeve column is arranged in the installation space. The mounting pipes are arranged on the insulating sleeve columns, one end of each mounting pipe is provided with a wire penetrating out of the metal pipe, and an electric heating wire is arranged between the other ends of the mounting pipes; and the thermocouple is arranged on the insulating sleeve column, and one end of the thermocouple penetrates out of the metal tube. The metal tube provides an installation environment, the installation tube is arranged in the metal tube, the connection stability of the heating wire and the wire can be improved, meanwhile, a protective cap does not need to be arranged outside the metal tube, the thermocouple can be directly installed, and sealant is arranged after the thermocouple is welded and installed subsequently. Compared with the prior art, the electric heating element has the advantages of fewer parts, lower cost and more optimized installation process, can realize the installation of the thermocouple, and improves the overall performance and service life of the electric heating element.

Description

Technical Field

[0001] This utility model relates to the field of electric heater technology, and in particular to an electric heating element with an integrated thermocouple. Background Technology

[0002] An electric heating element uses a metal tube as its outer shell and an alloy heating wire as its heating element. It has leads (wires) at one or both ends. The metal tube is filled with a dense magnesium oxide powder insulating medium to fix the heating element in place. When current passes through the heating wire, it overcomes resistance and does work, thus converting electrical energy into heat energy. For some heating elements that require temperature measurement and control, an internal thermocouple is needed to accurately measure the internal operating temperature of the heater. This thermocouple interacts with an external power controller to control the heater's power in real time.

[0003] In existing technologies, most tubular electric heating elements are U-shaped, double-ended, and manufactured using a powder-filling method. However, the U-shaped tubular structure has bends, preventing the internal installation of thermocouples. Single-ended metal tubular electric heating elements are typically manufactured using a magnesium oxide sleeve method. When welding to flange covers, the temperature at the weld joint is much higher than the maximum operating temperature of the sealant. Therefore, the cold end of the element can only be sealed with sealant and the copper wire connected to the lead rod after welding is complete. Due to the welding process, single-ended metal tubular electric heating elements are currently mostly externally connected. This involves brazing the copper wire to the exposed lead rod, adding a protective cap, and finally sealing the cap with sealant. However, this manufacturing process is only suitable for producing standalone metal tubular electric heating elements. Adding an internal armored thermocouple during welding would damage the already formed sealant. Therefore, externally connected single-ended tubular elements cannot be used in large quantities for welding to flange covers. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an electric heating element with an integrated thermocouple, so as to solve the problem that tubular electric heating elements in the prior art cannot install thermocouples.

[0005] To achieve the above and other related objectives, this utility model provides an electric heating element with an integrated thermocouple, comprising:

[0006] A metal tube, wherein an installation space is provided inside the metal tube, and an insulating sleeve post is provided within the installation space;

[0007] An installation tube is provided on the insulating sleeve post. One end of the installation tube is provided with a wire that passes through the metal tube, and the other end of the installation tube is provided with a heating wire.

[0008] A thermocouple is mounted on the insulating sleeve post, with one end of the thermocouple extending through the metal tube.

[0009] Optionally, the mounting tube is provided with a fixed channel, the wire is disposed at the end of the fixed channel away from the heating wire, and a connector is provided at the end of the fixed channel close to the heating wire, and the heating wire is connected to the connector.

[0010] Optionally, both the mounting pipe and the connector are copper pipes.

[0011] Optionally, the number of mounting tubes is two, and the heating wire is connected in series between the mounting tubes.

[0012] Optionally, the insulating sleeve post is provided with a first mounting hole and a second mounting hole, the first mounting hole being used to install the mounting tube and the second mounting hole being used to install the thermocouple.

[0013] Optionally, one end of the metal tube is provided with a plug, and the other end of the metal tube is provided with sealant. The plug and the sealant form the installation space, and the insulating sleeve is disposed between the plug and the sealant.

[0014] Optionally, the distance between the thermocouple and the wire is ≥1mm.

[0015] Optionally, the end of the thermocouple furthest from the plug extends through the sealant.

[0016] Optionally, the wire is crimped to the end of the mounting tube away from the heating wire.

[0017] As described above, the electric heating element with integrated thermocouple proposed in this utility model has the following beneficial effects:

[0018] Compared with existing technologies, the metal tube in this invention provides an installation environment. The wires and heating wires are installed inside the metal tube through the installation space inside the metal tube. Furthermore, the installation tube inside the metal tube improves the connection stability of the heating wires and wires. Therefore, this invention eliminates the need for a protective cap on the outside of the metal tube, allowing direct installation of the thermocouple. Sealant is then applied after the thermocouple is installed and welded. Compared with existing technologies, this invention uses fewer parts, has lower costs, and a more optimized process. It also enables the installation of thermocouples, improving the overall performance and service life of the electric heating element. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural schematic of an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Metal tube; 2. Plug; 3. Insulating sleeve; 4. Thermocouple; 5. Mounting tube; 6. Fixing channel; 7. Wire; 8. Connector; 9. Heating wire; 10. Sealant. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0023] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components related to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0024] like Figure 1 As shown, this utility model proposes an electric heating element with an integrated thermocouple 4.

[0025] In one exemplary embodiment, the electric heating element integrating the thermocouple 4 includes:

[0026] Metal tube 1, with an installation space inside the metal tube 1, and an insulating sleeve 3 installed inside the installation space;

[0027] The mounting tube 5 is set on the insulating sleeve post 3. One end of the mounting tube 5 is provided with a wire 7 that passes through the metal tube 1, and the other end of the mounting tube 5 is provided with a heating wire 9.

[0028] Thermocouple 4 is mounted on insulating sleeve post 3, with one end of thermocouple 4 extending out of metal tube 1.

[0029] In this embodiment, the metal tube 1 provides an installation environment. The wire 7 and the heating wire are installed inside the metal tube 1 through the installation space inside the metal tube 1. The installation tube 5 is set inside the metal tube 1, which can improve the connection stability of the heating wire 9 and the wire 7. Therefore, this utility model does not need to set a protective cap on the outside of the metal tube 1. The thermocouple 4 can be installed directly. After the thermocouple 4 is installed and welded, the sealant 10 is applied. Compared with the prior art, fewer parts are used, the cost is lower, the process is more optimized, and the installation of the thermocouple 4 can be realized, which improves the overall performance and service life of the electric heating element.

[0030] It is worth noting that in this embodiment, the metal tube 1 is a circular metal tube 1 with a through-hole. The metal tube 1 is the outer shell of the entire electric heating element. The mounting tube 5 is placed inside the metal tube 1, and the mounting tube 5 is an intermediate connector 8, which connects the wire 7 and the heating wire 9. Therefore, during installation, the end of the wire 7 can be directly installed inside the metal tube 1. When installing the wire 7, it is fixed to the right end of the mounting tube 5 by crimping. The free end of the wire 7 passes through the metal tube 1 and is connected to the power supply for circuit conduction.

[0031] It should also be noted that in this embodiment, the through space inside the metal tube 1 is the installation space, and the insulating sleeve 3 fits perfectly into the installation space. Therefore, the insulating sleeve 3 is also cylindrical, and it has through holes for installing the tube 5 and the thermocouple 4. In this embodiment, the length of the insulating sleeve 3 is less than the length of the metal tube 1.

[0032] In an exemplary embodiment, the mounting tube 5 is provided with a fixing channel 6, the wire 7 is provided at the end of the fixing channel 6 away from the heating wire 9, and the fixing channel 6 is provided with a connector 8 at the end near the heating wire 9, and the heating wire 9 is connected to the connector 8.

[0033] In this embodiment, the fixed channel 6 enables the mounting tube 5 to connect the wire 7 and the heating wire 9. However, since the diameter of the mounting tube 5 is relatively large, it is not convenient to directly connect the end to the heating wire 9. Therefore, a connector 8 is provided at the left end of the fixed channel 6. After the connector 8 is connected to the heating wire 9, the connector 8 is then connected to the mounting tube 5, thereby indirectly connecting the heating wire 9 and the wire 7. In this embodiment, both the connector 8 and the mounting tube 5 are made of materials with good conductivity, so that the current on the wire 7 can be quickly conducted to the heating wire 9 through the mounting tube 5 and the connector 8.

[0034] For example, in this embodiment, the connector 8 is made of copper tubing, with an outer diameter smaller than that of the fixed channel 6 and an inner diameter larger than that of the heating wire 9. The heating wire 9 and the connector 8 are connected by crimping. In this embodiment, the heating wire 9 is crimped onto the left end of the connector 8. After the connection is completed, the connector 8 is then fitted into the fixed channel 6 of the mounting tube 5, and the connector 8 and the mounting tube 5 are crimped together. The crimping method ensures that the heating wire 9 and the connector 8 are in full contact, and the connector 8 and the mounting tube 5 are in full contact, so as to facilitate the conduction of current.

[0035] It is worth noting that in this embodiment, the mounting tube 5 is also made of copper. Since both the connecting tube and the mounting tube 5 are made of copper, they have good electrical conductivity, are inexpensive, are lightweight, and have a certain degree of deformation capability during crimping.

[0036] It should also be noted that in this embodiment, there are two mounting tubes 5, and the heating wire 9 is connected in series between the mounting tubes 5. The two mounting tubes 5 are connected by the heating wire 9 to form a circuit, facilitating power connection. In this embodiment, there can be one pair or multiple pairs of mounting tubes 5 to form multiple heating circuits, thereby improving the heating efficiency of the electric heating element.

[0037] In an exemplary embodiment, the insulating sleeve 3 is provided with a first mounting hole and a second mounting hole. The first mounting hole is used to install the mounting tube 5, and the second mounting hole is used to install the thermocouple 4.

[0038] In this embodiment, both the first mounting hole and the second mounting hole are through holes. The first mounting hole can be used to fix the mounting tube 5, and the second mounting hole can be used to install the thermocouple 4. When fixing the mounting tube 5, the right end of the mounting tube 5 (the end without the heating wire 9) is inserted into the first mounting hole so that the entire mounting tube 5 is located inside the insulating sleeve post 3. When installing the thermocouple 4, the thermocouple 4 is inserted from the right end of the second mounting hole.

[0039] For example, in this embodiment, the insulating sleeve 3 is selected as a magnesium oxide sleeve, which is fitted inside the metal tube 1. After the insulating sleeve 3 is installed, the metal tube 1 is shrunk, and the size of the metal tube 1 is reduced. The magnesium oxide sleeve is squeezed into powder due to spatial deformation and is evenly filled in the installation space to cover the heating wire 9 and the installation tube 5.

[0040] For example, the distance between thermocouple 4 and wire 7 is ≥1mm. This ensures that thermocouple 4 can perform its normal temperature measurement function while also preventing thermocouple 4 from getting too close to heating wire 9.

[0041] It is worth noting that magnesium oxide is chosen for the insulating sleeve column 3 in this embodiment because it has high thermal conductivity and maintains stability at high temperatures, enabling it to reliably transfer heat to the metal tube 1. Other insulating materials with good thermal conductivity and high stability can also be used in this embodiment.

[0042] In an exemplary embodiment, a plug 2 is provided at one end of the metal tube 1, and a sealant 10 is provided at the other end of the metal tube 1. The plug 2 and the sealant 10 form an installation space, and an insulating sleeve 3 is disposed between the plug 2 and the sealant 10.

[0043] In this embodiment, the end of the metal tube 1 can be sealed by the plug 2 to prevent magnesium oxide powder from escaping from the metal tube 1.

[0044] For example, in this embodiment, since thermocouple 4 is installed, sealant 10 is applied to the right end of metal tube 1 after thermocouple 4 is welded to flange. After sealant 10 is applied, the above-mentioned tube shrinking process is performed.

[0045] It is worth noting that in this embodiment, the welding end of the thermocouple 4 protrudes through the sealant 10, allowing it to be welded to the flange.

[0046] In summary, the metal tube 1 in this invention provides an installation environment. The wire 7 and the heating wire are installed inside the metal tube 1 through the installation space inside the metal tube 1. Furthermore, the installation tube 5 inside the metal tube 1 improves the connection stability between the heating wire 9 and the wire 7. Therefore, this invention eliminates the need for a protective cap on the outside of the metal tube 1, allowing direct installation of the thermocouple 4. After the thermocouple 4 is installed and welded, the sealant 10 is applied. Compared with existing technologies, this invention uses fewer parts, has lower costs, and a more optimized process. It also enables the installation of the thermocouple 4, improving the overall performance and service life of the electric heating element.

[0047] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An electric heating element integrating a thermocouple, characterized in that, include: A metal tube, wherein an installation space is provided inside the metal tube, and an insulating sleeve post is provided within the installation space; An installation tube is provided on the insulating sleeve post. One end of the installation tube is provided with a wire that passes through the metal tube, and the other end of the installation tube is provided with a heating wire. A thermocouple is mounted on the insulating sleeve post, with one end of the thermocouple extending through the metal tube.

2. The electric heating element of the integrated thermocouple according to claim 1, characterized in that: The mounting tube is provided with a fixed channel, the wire is located at the end of the fixed channel away from the heating wire, and the fixed channel is provided with a connector at the end close to the heating wire, and the heating wire is connected to the connector.

3. The electric heating element of the integrated thermocouple according to claim 2, characterized in that: Both the mounting pipe and the connector are copper pipes.

4. The electric heating element of the integrated thermocouple according to claim 2, characterized in that: The number of mounting tubes is two, and the heating wire is connected in series between the mounting tubes.

5. The electric heating element of the integrated thermocouple according to claim 4, characterized in that: The insulating sleeve post is provided with a first mounting hole and a second mounting hole. The first mounting hole is used to install the mounting tube, and the second mounting hole is used to install the thermocouple.

6. The electric heating element of the integrated thermocouple according to claim 1, characterized in that: One end of the metal tube is provided with a plug, and the other end of the metal tube is provided with sealant. The plug and the sealant form the installation space, and the insulating sleeve is disposed between the plug and the sealant.

7. The electric heating element of the integrated thermocouple according to claim 1, characterized in that: The distance between the thermocouple and the wire is ≥1mm.

8. The electric heating element of the integrated thermocouple according to claim 6, characterized in that: The thermocouple is positioned so that the end furthest from the plug extends through the sealant.

9. The electric heating element of the integrated thermocouple according to claim 1, characterized in that: The wire is crimped to the end of the mounting tube away from the heating wire.

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