Mineral insulation electric heater with metal protective sleeve

Abstract

The utility model belongs to the technical field of electric heaters, and provides a mineral insulation electric heater with a metal protective sleeve, which comprises a shell, a heating element and a cable, a fixed end sealing material and a connecting end sealing material are arranged in the shell, and a filler is filled between the fixed end sealing material and the connecting end sealing material; the heating element extends into the filler in the shell, and the cable also extends into the filler in the shell and is connected with the heating element. The mineral substance insulation electric heater with the metal protective sleeve has good insulativity and oxidation resistance and has a function of protecting internal heating of the mineral substance insulation electric heater with the metal protective sleeve.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric heaters, and in particular relates to a mineral insulated electric heater with a metal protective sleeve. Background Art

[0002] In the construction of railway houses in northern China, preventing frost damage is a key task, which is directly related to the safety and operation quality of railway transportation. As the temperature in winter is often below minus ten degrees Celsius, the water supply, heating and fire protection pipelines inside the station house and the drainage facilities on the roof, such as gutters and downspouts, are easily damaged by freezing, such as cracks, leaks or bursts. In order to prevent these problems, mineral insulated electric heaters with metal protective sleeves are often used to heat and insulate these equipment.

[0003] The electric heaters currently used are generally in the shape of long strips, which can provide uniform heating over a large surface area. These heaters are usually composed of an internal PTC semiconductor heating element and an external polyethylene or polyvinyl chloride protective layer. However, these protective layers are prone to aging and losing their original insulation and protection capabilities under long-term exposure to harsh weather conditions such as wind, sun, rain and snow. This aging not only reduces the effectiveness of the protective layer, but may also cause circuit short circuits and fire risks.

[0004] For this purpose we offer a mineral insulated electric heater with a metal protective sheath. Utility Model Content

[0005] The utility model provides a mineral insulated electric heater with a metal protective sleeve, aiming to solve the problems raised by the above background technology.

[0006] The utility model is implemented as follows, comprising a housing, a heating element and a cable, wherein a fixed end sealant and a connection end sealant are arranged in the housing, and a filler is filled between the fixed end sealant and the connection end sealant; the heating element extends into the filler in the housing, and the cable also extends into the filler in the housing and is connected to the heating element;

[0007] The heating element comprises a metal protective sleeve, a heating wire and a mineral insulating layer, wherein the mineral insulating layer is arranged on the metal protective sleeve, and the heating wire is arranged inside the mineral insulating layer; the heating wire is a nickel-chromium alloy heating wire;

[0008] The cable comprises a copper core and a sheath, wherein the copper core is arranged in the sheath; and the copper core is connected to the heating wire.

[0009] Optionally, the mineral insulation layer is magnesium oxide powder.

[0010] Optionally, the heating element further includes an anti-oxidation layer, and the anti-oxidation layer is sleeved on the outside of the metal protective sleeve.

[0011] Optionally, the copper core is connected to the heating wire through an insulating sleeve.

[0012] Optionally, the diameter of the cross section of the heating element is 3 mm.

[0013] Optionally, the filler is magnesium oxide powder.

[0014] Optionally, an insulating porcelain tower is further provided in the shell, and the insulating porcelain tower is connected to the connecting end sealing material.

[0015] Optionally, the metal protective sleeve is made of stainless steel.

[0016] Optionally, at least two frames are further included, wherein the frames are in a strip shape, and the heating elements are arranged on the frames in a serpentine shape.

[0017] Optionally, the frame is made of stainless steel.

[0018] The beneficial effects achieved by the utility model are that the anti-oxidation, fireproof and radiation-proof performance of the heating element can be improved by providing a metal protective sleeve and an anti-oxidation layer. A mineral insulation layer is provided inside the heating element, because the mineral insulation layer has excellent corrosion resistance and electrical insulation at high temperatures, high heat conduction efficiency, energy saving and environmental protection, and high stability. At the same time, the electric heating wire can be fixed, insulated and flame-retardant. Therefore, a mineral insulated electric heater with a metal protective sleeve can effectively prevent the material from aging and losing the insulation effect, and can protect the function of the internal heating element. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the heating element provided by the utility model;

[0021] Figure 2 It is a three-dimensional schematic diagram of a mineral insulated electric heater with a metal protective sleeve provided by the utility model;

[0022] Figure 3 This is a schematic cross-sectional view of a mineral insulated electric heater with a metal protective sleeve provided by the utility model;

[0023] Figure 4 The utility model is a schematic diagram of a mineral insulated electric heater frame structure with a metal protective cover.

[0024] The reference numerals are as follows:

[0025] 1-shell, 2-fixed end sealing material, 3-connecting end sealing material, 4-filler, 5-heating element, 51-metal protective sleeve, 52-heating wire, 53-mineral insulation layer, 6-cable, 61-copper core, 62-jacket, 7-insulating porcelain tower, 8-insulating sleeve, 9-frame. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0027] The terms "first" and "second" in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps, operations, components or modules is not limited to the listed steps, operations, components or modules, but may optionally include steps, operations, components or modules that are not listed, or may optionally include other steps, operations, components or modules that are inherent to these processes, methods, products or devices.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] like Figures 1 to 3 As shown, a mineral insulated electric heater with a metal protective sleeve of an exemplary embodiment includes a shell 1, a heating element 5 and a cable 6. A fixed end seal 2 and a connecting end seal 3 are arranged in the shell 1, and a filler 4 is filled between the fixed end seal 2 and the connecting end seal 3; the heating element 5 extends into the filler 4 in the shell 1, and the cable 6 also extends into the filler 4 in the shell 1 and is connected to the heating element 5;

[0030] The heating element 5 comprises a metal protective sleeve 51, a heating wire 52 and a mineral insulating layer 53. The mineral insulating layer 53 is arranged in the metal protective sleeve 51, and the heating wire 52 is arranged in the mineral insulating layer 53. The heating wire 52 is a nickel-chromium alloy heating wire.

[0031] The cable 6 includes a copper core 61 and a jacket 62 . The copper core 61 is disposed inside the jacket 62 . The copper core 61 is connected to the heating wire 52 .

[0032] The fixed end sealing material 2 and the connection end sealing material 3 are arranged in the housing 1 , and can insulate and fix the heating element 5 and the cable 6 , thereby improving the sealing effect between the housing 1 and the heating element 5 and the cable 6 .

[0033] Furthermore, the fixed end sealing material 2 and the connection end sealing material 3 are both insulating resin adhesives, which have excellent insulating properties and can remain stable under high voltage and high temperature environments, and can effectively prevent current leakage and short circuit.

[0034] The heating wire 52 is a nickel-chromium alloy heating wire, which has high high temperature strength, is not easy to deform under high temperature use, has a structure that is not easy to change, has good plasticity, is easy to repair, has high emissivity, is non-magnetic, has strong corrosion resistance, and has a long service life. The softening point temperature of the nickel-chromium alloy wire is above 600 degrees, and the maximum use temperature can reach 1200 degrees.

[0035] The solid structure composed of the metal protective sleeve 51 and the mineral insulating layer 53 fundamentally prevents the intrusion of flammable gasoline and flames, has good insulation performance, ensures the normal operation of the circuit, and has high safety performance. Compared with traditional heating cables, it is a truly fireproof and explosion-proof heating element. At the same time, the metal protective sleeve 51 fundamentally avoids the corrosion of the cable, and neither acid, alkali liquid nor gas can penetrate into the cable. The metal protective sleeve 51 and the mineral insulating layer 53 are inorganic substances, and will not release toxic and harmful gases at high temperatures, meeting environmental protection requirements.

[0036] In actual use, the copper core 61 of the cable 6 is connected to a power source. When current passes through the copper core 61, it is transferred to the heating wire 52, specifically, to the nickel-chromium alloy heating wire. Nickel-chromium alloy has high resistance characteristics, high heating efficiency, and is not easily deformed or damaged in a high temperature environment, making it an ideal heating material. At this time, the heating wire 52 generates heat, which is transferred to the outside of the heater through the metal protective sheath 51.

[0037] The metal protective sleeve 51 not only conducts heat, but also effectively prevents the intrusion of external factors, such as flammable liquids or gases, thereby increasing safety. At the same time, the mineral insulating layer 53 ensures the insulation performance around the heating wire 52, prevents the risk of current leakage and short circuit, and ensures the stable operation of the heater.

[0038] As an optional implementation, the mineral insulating layer 53 is magnesium oxide powder.

[0039] Furthermore, one of the main uses of magnesium oxide is as a flame retardant. Traditional flame retardant materials widely use flame retardant mixtures composed of halogen-containing polymers or halogen-containing flame retardants. Once a fire occurs, due to thermal decomposition and combustion, a large amount of smoke and toxic corrosive gases will be generated. Therefore, in addition to flame retardant efficiency, non-toxicity and odorlessness are also important characteristics of magnesium oxide. Magnesium oxide has excellent corrosion resistance and electrical insulation at high temperatures, high thermal conductivity efficiency, energy saving and environmental protection, high stability, low price, large storage capacity and other advantages, so it is widely used as a high-temperature heat-resistant material.

[0040] As an optional implementation, the heating element 5 further includes an anti-oxidation layer 54 , and the anti-oxidation layer 54 is sleeved on the outside of the metal protective sleeve 51 .

[0041] The anti-oxidation layer 54 may be, but is not limited to, aluminum oxide, zinc oxide or chromium oxide, and may provide heat resistance and corrosion resistance to the metal protective cover 51 , thereby increasing the service life of the metal protective cover 51 .

[0042] As an optional implementation, the copper core 61 is connected to the heating wire 52 through the insulating sleeve 8 .

[0043] The insulating sleeve 8 is made of polytetrafluoroethylene, which has excellent chemical stability, heat resistance and electrical insulation, and can effectively protect the copper core 61 and the heating wire 52 .

[0044] As an optional embodiment, the diameter of the cross section of the heating element 5 is 3 mm.

[0045] Since the cross section of the heating element 5 is small, it is easier to bend and shape, and can meet complex or small design requirements.

[0046] As an optional implementation, the filler 4 is magnesium oxide powder.

[0047] Magnesium oxide is an excellent refractory material that can withstand extremely high temperatures without melting or decomposing. Magnesium oxide has a high melting point and is suitable for high temperature environments.

[0048] As an optional implementation, an insulating porcelain tower 7 is further provided in the housing 1 , and the insulating porcelain tower 7 is connected to the connection end sealing material 3 .

[0049] The insulating porcelain tower 7 has extremely high electrical insulation performance, which can effectively prevent current leakage and short circuit, thereby protecting the transmission line. At the same time, the insulating porcelain tower 7 can withstand high temperature and severe weather conditions, including corrosive environments such as strong acid, strong alkali and salt spray, ensuring the long-term stable operation of the mineral insulated electric heater with a metal protective sleeve. And the insulating porcelain tower 7 has good mechanical strength and stability, and can withstand the influence of strong winds, hail and other natural factors. The insulating porcelain tower 7 has a longer service life than other materials such as plastics or composite materials, reducing the need for maintenance and replacement.

[0050] As an optional implementation, the metal protective cover 51 is made of stainless steel.

[0051] Stainless steel has good anti-electromagnetic radiation and shielding effect, and its performance indicators will not change when working in a radiation-exposed place. Traditional electric heating cables do not have anti-radiation function.

[0052] As an optional embodiment, at least two frames 9 are further included, the frames 9 are in a strip shape, and the heating element 5 is arranged in a serpentine shape on the frames 9. The heating element 5 can be fixed on the frames 9 by the frames 9, so that the longer heating element 5 can be arranged as a whole.

[0053] As an optional implementation, the frame 9 is made of stainless steel.

[0054] The frame 9 is made of stainless steel, which is corrosion-resistant and has a good deformation effect, so the frame 9 can be bent better. When in use, the frame 9 can be bent into a circle so that the heating element 5 heats a cylindrical object, and the frame 9 can also be bent into a rectangle so that the heating element 5 heats a rectangular object. The specific shape can be changed according to the actual use process.

[0055] Therefore, through the above technical solution, the mineral insulated electric heater with a metal protective sleeve has good insulation, oxidation resistance and the function of protecting the internal heating of the mineral insulated electric heater with a metal protective sleeve.

[0056] The exemplary embodiments of the present application may be combined with each other, and the exemplary embodiments obtained by the combination also fall within the scope of the present application.

[0057] This application uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core idea of ​​this application. At the same time, for technical personnel in this field, according to the idea of ​​this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

Claims

1. A mineral insulated electric heater with a metal protective sleeve, characterized in that: The invention comprises a housing (1), a heating element (5) and a cable (6); a fixed end sealing material (2) and a connecting end sealing material (3) are arranged in the housing (1); a filler (4) is filled between the fixed end sealing material (2) and the connecting end sealing material (3); the heating element (5) extends into the filler (4) in the housing (1); the cable (6) also extends into the filler (4) in the housing (1) and is connected to the heating element (5); The heating element (5) comprises a metal protective sleeve (51), a heating wire (52) and a mineral insulating layer (53); the mineral insulating layer (53) is arranged on the metal protective sleeve (51), and the heating wire (52) is arranged inside the mineral insulating layer (53); the heating wire (52) is a nickel-chromium alloy heating wire; The cable (6) comprises a copper core (61) and a jacket (62); the copper core (61) is arranged inside the jacket (62); and the copper core (61) is connected to the heating wire (52).

2. A mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: The mineral insulating layer (53) is magnesium oxide powder.

3. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: The heating element (5) further comprises an anti-oxidation layer (54), wherein the anti-oxidation layer (54) is sleeved on the outside of the metal protective sleeve (51).

4. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: The copper core (61) is connected to the heating wire (52) via an insulating sleeve (8).

5. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: The cross-sectional diameter of the heating element (5) is 3 mm.

6. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: The filler (4) is magnesium oxide powder.

7. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: An insulating porcelain tower (7) is also provided in the housing (1), and the insulating porcelain tower (7) is connected to the connection end sealing material (3).

8. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: The metal protective sleeve (51) is made of stainless steel.

9. The mineral insulated electric heater with a metal protective sleeve according to claim 1, characterized in that: It also comprises at least two frames (9), the frames (9) being in a strip shape, and the heating elements (5) being arranged on the frames (9) in a serpentine shape.

10. The mineral insulated electric heater with a metal protective sleeve according to claim 9, characterized in that: The frame (9) is made of stainless steel.

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