A high-efficiency energy-saving heating tube and preparation method thereof

Abstract

The present invention discloses a high-efficiency and energy-saving heating tube and a preparation method thereof, wherein the heating tube comprises a heating film and copper sheets, molybdenum sheets, mortise screws and wires are arranged at both ends of the heating film, wherein the copper sheets, heating film, molybdenum sheets and copper sheets are mortised together by mortise screws to form a heating film combination structure, and both ends are connected to the molybdenum sheets by wires; the heating film combination structure is encapsulated in a packaging tube, and the wires are led out after passing through a ceramic joint. The preparation method comprises the following steps: applying silver paste on both sides of the heating film and curing the paste, and then mortising the copper sheets, heating film, molybdenum sheets and copper sheets by mortise screws to obtain a heating film combination structure; the two ends are connected to the molybdenum sheets by wires; finally, the heating film combination structure is placed in a packaging tube, and a ceramic joint is used to vacuum encapsulate the two ends of the packaging tube, and the wires are led out of the packaging tube through a ceramic head. The high-efficiency and energy-saving heating tube provided by the present invention has the advantages of low voltage, low energy consumption, environmental protection, long service life and fast heating speed.

Description

Technical Field

[0001] The invention belongs to the field of electric heating, and in particular relates to a high-efficiency energy-saving heating tube and a preparation method thereof. Background Art

[0002] The surface temperature of the high-temperature heating rod is 400-500℃. The traditional high-temperature heating rod is made of tungsten wire and graphite. Tungsten wire heating and graphite rod heating are currently the main materials for heating in quartz heating tubes. The voltage and power are relatively high. Two-dimensional graphene is a new material with good electrical conductivity and electrothermal conversion efficiency. Graphene is made into a thin film with the advantages of light texture, high strength, and fast heating. The conventional tungsten wire heating and graphite rod heating generally require 220V voltage and 350-450W power. The voltage and energy consumption are relatively large. At the same time, the heating temperature is not high, the heating process time is long, and the thermoelectric conversion efficiency is low, which leads to the use of the above method. The material service life is not high, generally about 5000 hours, which leads to low material utilization and increased costs. Summary of the invention

[0003] The purpose of the present invention is to provide a high-efficiency and energy-saving heating tube and a preparation method thereof in order to overcome the above-mentioned deficiencies in the prior art. By combining a specific structure and materials, the heating rate and the operating voltage of the heating tube are improved, the energy consumption is reduced, and the electrical conversion efficiency is improved.

[0004] The present invention is achieved through the following technical solutions:

[0005] A high-efficiency and energy-saving heating tube comprises a heating film and copper sheets, molybdenum sheets, fixing screws and wires are arranged at both ends of the heating film, wherein the copper sheets, heating film, molybdenum sheets and copper sheets are arranged in sequence and then fixed together by fixing screws to form a heating film combination structure, both ends of the heating film combination structure are connected to the molybdenum sheets by wires; the heating film combination structure is packaged in a packaging tube, and both ends of the packaging tube are vacuum packaged by ceramic joints, and the wires are led out after passing through the ceramic joints.

[0006] Furthermore, in the high-efficiency energy-saving heating tube, the heating film is a carbon material heating film.

[0007] Furthermore, in the described high-efficiency energy-saving heating tube, the parts where both ends of the heating film are combined with the copper sheet and the molybdenum sheet are coated with a silver paste layer.

[0008] Furthermore, in the high-efficiency energy-saving heating tube, the ceramic joint is vacuum-packaged and then a protective gas is filled into the packaging tube.

[0009] Furthermore, in the high-efficiency and energy-saving heating tube, the carbon material heating film can be selected from any one of graphene film, carbon nanotube film, carbon fiber film or graphene-carbon fiber-carbon nanotube composite film.

[0010] Furthermore, in the high-efficiency and energy-saving heating tube, the packaging tube is any one of a quartz tube, a glass tube, a ceramic tube or an alumina tube.

[0011] Furthermore, in the high-efficiency energy-saving heating tube, the protective gas is nitrogen or an inert gas.

[0012] Furthermore, the high-efficiency and energy-saving heating tube has a packaging tube with a diameter of 10-100 mm and a wall thickness of 2-10 mm.

[0013] The high-efficiency energy-saving heating tube described in any of the above items is used in the fields of electric ovens, electric heating furnaces, bathroom heaters, paint-baking far-infrared heating lamps, chemical heating or medical heating and disinfection.

[0014] A method for preparing the above-mentioned high-efficiency energy-saving heating tube comprises the following steps:

[0015] Step 1: Apply silver paste on both sides of the heating film and solidify it;

[0016] Step 2, attaching the two ends of the heating film after the silver paste is cured together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixing them together by fixing screws to obtain a heating film assembly structure;

[0017] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0018] Step 4, place the heating film assembly structure in the packaging tube, use ceramic joints to seal the two ends of the packaging tube, and lead the wires through the ceramic heads to the outside of the packaging tube. During the packaging process, the packaging tube is evacuated and filled with inert gas.

[0019] In the high-efficiency and energy-saving heating tube provided by the present invention, a copper sheet, a molybdenum sheet and a heating film surface are coated with silver paste to form a heating film combination structure. The molybdenum sheet is used as an electrical connector to achieve good integration. The insulation protection of both ends of the heating tube is achieved through a ceramic joint. A specific joint electrical connection structure is formed by silver paste, copper sheet, molybdenum sheet and fixing screws, which not only fixes the heating film, but also can well form the heating tube as a whole, and synergistically exert good heating performance.

[0020] The heating film in the high-efficiency and energy-saving heating tube provided by the present invention adopts any one of graphene film, carbon nanotube film, graphene-carbon nanotube composite film, graphene-carbon fiber composite film, and graphene-carbon fiber-carbon nanotube composite film to replace traditional tungsten wire and graphite rod. The conditions during use are 60-80V voltage and 150-200W power, which effectively reduces energy consumption and has a service life of more than 10,000 hours.

[0021] The high-efficiency and energy-saving heating tube heating film provided by the present invention has the advantages of low voltage, low power and low energy consumption, and can be quickly heated within 10 seconds and reach a specified heating temperature (such as 400°C) within 20 seconds.

[0022] At present, the thermoelectric conversion efficiency of conventional tungsten wire and graphite rod is about 70%, and the film thermoelectric conversion efficiency of the high-efficiency energy-saving heating tube provided by the present invention reaches about 98%. The present invention can be well applied to electric ovens, electric heating furnaces, paint far-infrared heating lamps, chemical heating industry, medical heating and disinfection and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a high-efficiency energy-saving heating tube provided in Example 1 of the present invention;

[0024] Figure 2 A schematic diagram of a connection structure of one end of a heating film combination structure in a high-efficiency energy-saving heating tube provided in Example 1 of the present invention;

[0025] Figure 3 A side view of a connection structure at one end of a heating film combination structure in a high-efficiency and energy-saving heating tube provided in Example 1 of the present invention;

[0026] above Figure 1-Figure 3 In the figure, 1 is a heating film, 2 is a packaging tube, 3 is a ceramic joint, 4 is a silver paste layer, 5 is a copper sheet, 6 is a molybdenum sheet, 7 is a fixing screw, and 8 is a wire. DETAILED DESCRIPTION

[0027] The following examples are provided to further help those skilled in the art to understand the present invention, but do not limit the modification and breakthrough of the present invention. Any modification made without departing from the present invention shall fall within the protection scope of the present invention.

[0028] Example 1

[0029] like Figure 1-Figure 3As shown, they are respectively a schematic diagram of the high-efficiency energy-saving heating tube provided in this embodiment and a schematic diagram and a side view of the connection structure of one end of the heating film combination structure, including a heating film 1 and copper sheets 5, molybdenum sheets 6, mortise screws 7 and wires 8 are respectively arranged at both ends of the heating film 1, wherein the arrangement method is to arrange them in the order of copper sheets 5, heating film 1, molybdenum sheets 6 and copper sheets 5, and then mortise them together by mortise screws 7 to form a heating film combination structure, and both ends of the heating film combination structure are connected to the molybdenum sheets 6 by wires 8; the heating film combination structure is encapsulated in a packaging tube 2, and both ends of the packaging tube 2 are vacuum-encapsulated by ceramic joints 3, and the wires 8 are led out after passing through the ceramic joints 3.

[0030] The heating film 1 described above can adopt a heating film made of carbon material, specifically any one of a graphene film, a carbon nanotube film, a carbon fiber film or a graphene-carbon fiber-carbon nanotube composite film; the parts where the two ends of the heating film 1 are combined with the copper sheet 5 and the molybdenum sheet 6 are coated with a silver paste layer; the packaging tube can adopt any one of a quartz tube, a glass tube, a ceramic tube or an alumina tube; after the ceramic joint is vacuum packaged, a protective gas is filled in the packaging tube.

[0031] The high-efficiency and energy-saving heating tube provided in the present embodiment adopts a heating film combination structure composed of a copper sheet, a molybdenum sheet and a heating film coated with a silver paste layer, realizes integration through tack screws, and realizes insulation protection at both ends of the heating tube through ceramic joints. A specific joint electrical connection structure is formed by silver paste, copper sheet, molybdenum sheet and tack screws, which not only plays a role in fixing the heating film, but also can well form the heating tube as a whole, and synergistically exert good heating performance.

[0032] Example 2

[0033] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0034] Step 1: Apply silver paste to both ends of a graphene film with a size of 300 mm × 10 mm and then cure it at 100° C. for 30 minutes;

[0035] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0036] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0037] Step 4, place the heating film assembly structure in a quartz tube, seal both ends of the quartz tube with ceramic joints, and lead the wires through the ceramic seals to the outside of the quartz tube. During the sealing process, the quartz tube is evacuated and filled with inert gas.

[0038] Example 3

[0039] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0040] Step 1: Apply silver paste to both ends of a graphene film with a size of 300 mm × 20 mm and then cure it at 100° C. for 30 minutes;

[0041] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0042] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0043] Step 4, place the heating film combination structure in a 300mm long, 20mm wide, and 2mm thick ceramic tube, use ceramic joints to seal both ends of the ceramic tube, and pass the wires through the ceramic heads to lead out of the packaging tube. During the packaging process, the ceramic tube is evacuated and filled with inert gas.

[0044] Example 4

[0045] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0046] Step 1: Apply silver paste to both ends of a 300 mm × 30 mm carbon nanotube film and then cure it at 100° C. for 30 min.

[0047] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0048] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0049] Step 4, place the heating film combination structure in a glass tube of 300 mm long, 30 mm wide and 2 mm thick, seal both ends of the glass tube with ceramic joints, and lead the wires through the ceramic heads to the outside of the glass tube. During the sealing process, the glass tube is evacuated and filled with inert gas.

[0050] Example 5

[0051] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0052] Step 1: Apply silver paste to both ends of a 300 mm × 10 mm graphene-carbon nanotube composite film and then cure it at 100° C. for 30 min;

[0053] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0054] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0055] Step 4, place the heating film combination structure in an alumina tube of 300 mm long, 10 mm wide, and 2 mm thick, use ceramic joints to seal both ends of the alumina tube, and pass the wires through the ceramic heads to lead out of the alumina tube. During the packaging process, the alumina tube is evacuated and filled with nitrogen.

[0056] Example 6

[0057] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0058] Step 1: Apply silver paste to both ends of a 400 mm × 10 mm graphene-carbon fiber composite membrane and then cure it at 100° C. for 30 min.

[0059] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0060] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0061] Step 4, place the heating film combination structure in a quartz tube of 400 mm long, 15 mm wide and 4 mm thick, use ceramic joints to seal both ends of the quartz tube, and pass the wires through the ceramic heads to lead out of the quartz tube. During the packaging process, the quartz tube is evacuated and filled with inert gas.

[0062] Example 7

[0063] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0064] Step 1: Apply silver paste to both ends of a 400 mm × 20 mm graphene-carbon nanotube-carbon fiber composite membrane and then cure it at 100° C. for 30 min;

[0065] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0066] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0067] Step 4, place the heating film combination structure in a quartz tube of 400 mm long, 30 mm wide and 10 mm thick, use ceramic joints to seal both ends of the quartz tube, and pass the wires through the ceramic heads to lead out of the quartz tube. During the packaging process, the quartz tube is evacuated and filled with inert gas.

[0068] Example 8

[0069] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0070] Step 1: Apply silver paste to both ends of a 300 mm × 10 mm graphene-carbon nanotube composite film and then cure it at 100° C. for 30 min;

[0071] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0072] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0073] Step 4, place the heating film combination structure in a ceramic tube of 300 mm long, 20 mm wide and 10 mm thick, use ceramic joints to seal both ends of the ceramic tube, and pass the wires through the ceramic heads to lead out of the packaging tube. During the packaging process, the ceramic tube is evacuated and filled with inert gas.

[0074] Example 9

[0075] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0076] Step 1: Apply silver paste to both ends of a 400 mm × 30 mm graphene film and then cure it at 100 ° C for 30 minutes;

[0077] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0078] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0079] Step 4, place the heating film combination structure in a glass tube of 400 mm long, 30 mm wide and 10 mm thick, use ceramic joints to seal both ends of the glass tube, and pass the wires through the ceramic heads to lead out of the glass tube. During the packaging process, the glass tube is evacuated and filled with inert gas.

[0080] Example 10

[0081] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0082] Step 1: Apply silver paste to both ends of a graphene film with a size of 500 mm × 20 mm and then cure it at 100° C. for 30 minutes;

[0083] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0084] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0085] Step 4, place the heating film combination structure in an alumina tube of 500 mm long, 20 mm wide, and 8 mm thick, use ceramic joints to seal both ends of the alumina tube, and pass the wires through the ceramic heads to lead out of the alumina tube. During the packaging process, the alumina tube is evacuated and filled with inert gas.

[0086] Embodiment 11

[0087] A method for preparing a high-efficiency energy-saving heating tube comprises the following steps:

[0088] Step 1: Apply silver paste to both ends of a graphene film with a size of 500 mm × 30 mm and then cure it at 100°C for 30 minutes;

[0089] Step 2, the two ends of the graphene film after the silver paste is solidified are respectively attached together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixed together by fixing screws to obtain a heating film combined structure;

[0090] Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires;

[0091] Step 4, place the heating film combination structure in an alumina tube of 500 mm long, 30 mm wide, and 10 mm thick, use ceramic joints to seal both ends of the alumina tube, and pass the wires through the ceramic heads to lead out of the alumina tube. During the packaging process, the alumina tube is evacuated and filled with inert gas.

[0092] The high-efficiency and energy-saving heating tube prepared in the above embodiment has the characteristics of fast heating speed, low energy consumption and high electrical conversion rate through performance testing. The working voltage is 60-80V, the working power is 150-200W, and it can be heated to 400-500°C within 20 seconds. At the same time, the thermoelectric conversion efficiency reaches 98%, which is far better than the 70% of the prior art.

Claims

1. A method for preparing an energy-efficient heating tube, characterized in that: The following steps are involved: Step 1: Apply silver paste on both sides of the heating film and solidify it; Step 2, attaching the two ends of the heating film after the silver paste is cured together in the order of copper sheet, heating film, molybdenum sheet, and copper sheet, and then fixing them together by fixing screws to obtain a heating film assembly structure; Step 3, connecting the two ends of the heating film assembly structure to the molybdenum sheet using wires; Step 4, placing the heating film assembly structure in a packaging tube, using ceramic joints to seal both ends of the packaging tube, and passing the wires through the ceramic sealing heads to lead out of the packaging tube. During the packaging process, the packaging tube is evacuated and filled with inert gas; The heating film is a carbon material heating film, and the carbon material heating film is any one of a graphene film, a carbon nanotube film, or a graphene-carbon fiber-carbon nanotube composite film.

2. The method for preparing the high-efficiency energy-saving heating tube according to claim 1, characterized in that: The packaging tube is any one of a quartz tube, a glass tube, a ceramic tube or an alumina tube.

3. The method for preparing the high-efficiency energy-saving heating tube according to claim 1, characterized in that: The packaging tube has a diameter of 10-100 mm and a wall thickness of 2-10 mm.

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