High efficiency electric heater long process resistance tube element

Abstract

A high-efficiency electric heater long-flow resistor tube element, including a flange and an electrode plate arranged at intervals, an "S"-shaped resistor tube relatively arranged between the flange and the electrode plate, and a single "S"-shaped resistor tube having the following structure: a first layer resistor tube, a second layer resistor tube and a third layer resistor tube arranged in sequence from top to bottom, the tail of the first layer resistor tube is connected to the second layer resistor tube through a first adapter, the tail of the second layer resistor tube is connected to the third layer resistor tube through a second adapter, the head of the first layer resistor tube passes through the flange, and the tail of the third layer resistor tube passes through the electrode plate; multiple ceramic supports are installed on the flange, the first layer resistor tube, the second layer resistor tube and the third layer resistor tube. The heat exchange efficiency is improved, the length of the equipment is reduced, the maximum surface temperature of the electric heating element is reduced, the service life of the equipment is increased, and the reliability of use is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating elements, in particular to a long-flow resistance tube element of a high-efficiency electric heater. Background Art

[0002] The electric heater is a core electric heating device for the technical research and development and performance verification of key military equipment. It is used to heat the flowing gaseous medium. When the heating medium passes through the heating chamber of the electric heater under pressure, the huge heat generated by the internal operation of the electric heating element is evenly taken away by the principle of fluid thermodynamics, so that the temperature of the heated medium meets the process requirements.

[0003] The resistance tube of the electric heater in the prior art usually adopts a long strip structure. In actual use, increasing the heating length of the resistance tube is the most effective way to reduce the temperature of the electric heating element. Through multiple simulation calculations, under most high-temperature conditions, an extremely long resistance tube heat exchange length is required to meet the design requirements. However, due to the limitations of installation space, actual manufacturing difficulty and the expansion of the resistance tube during use, longer resistance tubes are obviously not desirable. Summary of the invention

[0004] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a rationally structured and efficient electric heater long-flow resistor tube element, which adopts an assembled resistor tube structure and is connected in series end to end, effectively overcoming the problems of resistor tube temperature exceeding the limit, long installation size, difficulty in manufacturing and large expansion during use, and can keep the air mass flow rate in the tube unchanged, thereby ensuring that the heat transfer coefficient is not reduced. Under the premise of the same length size, the heating surface area of ​​the resistor tube used is 3 times the heating surface area of ​​the ordinary resistor tube, thereby improving the heat exchange efficiency, reducing the length size of the equipment, reducing the maximum surface temperature of the electric heating element, increasing the service life of the equipment, and greatly improving the reliability of use.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A high-efficiency electric heater long-flow resistance tube element comprises a flange and an electrode plate arranged at intervals, and an "S"-shaped resistance tube arranged oppositely is installed between the flange and the electrode plate.

[0007] The structure of a single "S"-shaped resistor tube is: a first layer of resistor tubes, a second layer of resistor tubes and a third layer of resistor tubes are arranged in sequence from top to bottom. The tail of the first layer of resistor tubes is connected to the second layer of resistor tubes through a first adapter, and the tail of the second layer of resistor tubes is connected to the third layer of resistor tubes through a second adapter.

[0008] The head of the first layer of resistance tube passes through the flange, and the tail of the third layer of resistance tube passes through the electrode plate;

[0009] A plurality of ceramic support members are installed on the flange, the first layer of resistance tubes, the second layer of resistance tubes and the third layer of resistance tubes.

[0010] As a further improvement of the above technical solution:

[0011] The first layer resistor tube, the second layer resistor tube and the third layer resistor tube are all slender tubes, and each slender tube passes through a plurality of spaced ceramic support members.

[0012] The first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes all adopt a combined structure. The head of the first layer of resistor tube is connected to the first resistor tube joint. The head of the first resistor tube joint passes through the flange and is supported by a ceramic support. The tail of the first resistor tube joint is installed with the first connected resistor tube through the ceramic support. The tail of the first connected resistor tube is also installed with the second connected resistor tube through the ceramic support. The tail of the second connected resistor tube is installed with the second layer of resistor tube through the first adapter. The tail of the second layer of resistor tube is installed with the third layer of resistor tube through the second adapter. The tail of the third layer of resistor tube is connected to the second resistor tube joint. The second resistor tube joint passes through the electrode plate.

[0013] The structure of the ceramic support is as follows: it includes a middle cylindrical structure, and a first cylindrical structure and a second cylindrical structure are respectively extended from both ends of the middle cylindrical structure; metal linings are installed inside the first cylindrical structure, the middle cylindrical structure and the second cylindrical structure at the same time, and the metal linings cooperate with the resistor tube; the first cylindrical structure, the middle cylindrical structure and the second cylindrical structure are all made of silicon carbide material or alumina ceramic material.

[0014] The wall thicknesses of the first layer resistor tube, the second layer resistor tube and the third layer resistor tube increase in sequence from small to large.

[0015] The wall thickness of the first layer of resistor tube is 1.6-1.8mm, the wall thickness of the second layer of resistor tube is 1.7-1.9mm, and the wall thickness of the third layer of resistor tube is 1.8-2mm.

[0016] The diameters of the first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes increase in sequence from small to large.

[0017] The diameter of the first layer of resistor tubes is 20 mm, the diameter of the second layer of resistor tubes is 21 mm, and the diameter of the third layer of resistor tubes is 22 mm.

[0018] A radiation tube is installed between the two "S"-shaped resistance tubes, one end of the radiation tube is connected to the flange, and the other end of the radiation tube is spaced from the electrode plate.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention has a compact and reasonable structure and is easy to operate. By changing the structure of the resistor tube, the original long tube is changed into an "S"-shaped resistor tube, and adopting an assembled structure, the length of the heating core is reduced to 1 / 3 of the original length, which effectively reduces the deformation caused by inconsistent temperature. At the same time, the deformation can be effectively released through the connection between the 6 resistor tubes, thereby avoiding the resistor tube from being bent and deformed by force.

[0021] The "S"-shaped resistor tube structure described in the present invention can greatly improve the heat exchange efficiency.

[0022] The "S"-shaped resistor tube structure described in the present invention increases the heat exchange length, which is equivalent to three devices connected in series. This structure can effectively reduce the operating temperature of the resistor tube and ensure its service life.

[0023] The present invention adopts a double-group "S"-shaped resistor tube connection structure, which can fully release the temperature difference deformation of the resistor tube and avoid bending and deformation of the resistor tube and ceramic breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a schematic structural diagram of the ceramic support member of the present invention.

[0026] Wherein: 1. flange; 2. first resistor pipe joint; 3. second adapter; 4. ceramic support; 5. first connection resistor tube; 6. second connection resistor tube; 7. first adapter; 8. second resistor pipe joint; 9. electrode plate;

[0027] 401, first cylindrical structure; 402, metal lining; 403, middle cylindrical structure; 404, second cylindrical structure. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, the high-efficiency electric heater long-flow resistance tube element of this embodiment includes a flange 1 and an electrode plate 9 arranged at intervals, and an "S"-shaped resistance tube is installed between the flange 1 and the electrode plate 9.

[0030] The structure of a single "S"-shaped resistor tube is: a first layer of resistor tubes, a second layer of resistor tubes and a third layer of resistor tubes are arranged in sequence from top to bottom. The tail of the first layer of resistor tubes is connected to the second layer of resistor tubes through a first adapter 7, and the tail of the second layer of resistor tubes is connected to the third layer of resistor tubes through a second adapter 3.

[0031] The head of the first layer of resistance tube passes through the flange 1, and the tail of the third layer of resistance tube passes through the electrode plate 9;

[0032] A plurality of ceramic support members 4 are installed on the flange 1, the first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes.

[0033] The first layer resistor tube, the second layer resistor tube and the third layer resistor tube are all slender tubes, and each slender tube passes through a plurality of spaced ceramic support members 4 .

[0034] The first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes all adopt a combined structure. The head of the first layer of resistor tube is connected to the first resistor tube joint 2. The head of the first resistor tube joint 2 passes through the flange 1 and is supported by the ceramic support 4. The tail of the first resistor tube joint 2 is installed with the first connected resistor tube 5 through the ceramic support 4. The tail of the first connected resistor tube 5 is also installed with the second connected resistor tube 6 through the ceramic support 4. The tail of the second connected resistor tube 6 is installed with the second layer of resistor tube through the first adapter 7. The tail of the second layer of resistor tube is installed with the third layer of resistor tube through the second adapter 3. The tail of the third layer of resistor tube is connected to the second resistor tube joint 8. The second resistor tube joint 8 passes through the electrode plate 9.

[0035] like Figure 2 As shown, the structure of the ceramic support 4 is: it includes a middle cylindrical structure 403, and the first cylindrical structure 401 and the second cylindrical structure 404 are respectively extended at both ends of the middle cylindrical structure 403, and the first cylindrical structure 401, the middle cylindrical structure 403 and the second cylindrical structure 404 are simultaneously installed with a metal lining 402, and the metal lining 402 cooperates with the resistor tube; the first cylindrical structure 401, the middle cylindrical structure 403 and the second cylindrical structure 404 are all made of silicon carbide material or alumina ceramic material.

[0036] The wall thicknesses of the first layer resistor tube, the second layer resistor tube and the third layer resistor tube increase in sequence from small to large.

[0037] The wall thickness of the first layer of resistor tube is 1.6-1.8mm, the wall thickness of the second layer of resistor tube is 1.7-1.9mm, and the wall thickness of the third layer of resistor tube is 1.8-2mm.

[0038] The diameters of the first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes increase in sequence from small to large.

[0039] The diameter of the first layer of resistor tubes is 20 mm, the diameter of the second layer of resistor tubes is 21 mm, and the diameter of the third layer of resistor tubes is 22 mm.

[0040] A radiation tube is installed between the two "S"-shaped resistor tubes, one end of the radiation tube is connected to the flange 1, and the other end of the radiation tube is spaced apart from the electrode plate 9.

[0041] A radiation tube (not shown in the figure) is installed between the two "S"-shaped resistor tubes. One end of the radiation tube (not shown in the figure) is connected to the flange 1, and the other end of the radiation tube is spaced apart from the electrode plate 9.

[0042] The diameter of the first layer of resistor tubes is small, the diameter of the second layer of resistor tubes is medium, and the diameter of the third layer of resistor tubes is large. The principle is: the first layer of resistor tubes has a low inlet temperature, a small volume flow rate, and a small required flow cross-section. The first layer is medium, and the third layer is larger. Under the same thickness conditions, the smaller the diameter, the greater the resistance, and the greater the heat generation. The heating power can be high at the beginning and low at the end, and the heat transfer coefficient can be improved (usually, the smaller the heat transfer distance, the higher the heat transfer coefficient). At the same time, it can reduce equipment costs, save space, and reduce equipment volume. Not limited to changing the diameter, the power can also be high at the beginning and low at the end by changing the resistivity of the material. The resistivity of the first layer is large, the second layer is medium, and the third layer is small.

[0043] The design of the radiation tube (not shown in the figure) of the present invention is resistant to high temperatures and has high radiation and receiving radiation rates. It is used to supplement the flow channel when the equipment requires a larger flow cross-section. This resistance tube is not connected to a power source, and is radiantly heated by circumferentially distributed energized resistance tubes, thereby increasing the heat transfer area and the flow channel and reducing the temperature of the heating assembly element.

[0044] The resistor tube element of the present invention can be directly installed in the tube shell to form a detachable electric heater heat source component.

[0045] The resistor tube element described in the present invention is installed in an electric heater. The electric heater mainly includes an air intake rectification chamber, a heat transfer oil cooling jacket, a pressure cylinder, a container insulation liner, an air-cooled inner jacket, a core-removable resistor tube, etc. The cold medium first enters the gas rectification chamber. There are several small holes in the rectification chamber, which play a role in equalizing the flow and reducing the speed of the air intake. The uniform gas enters the air-cooled inner jacket to cool the pressure cylinder. The air-cooled jacket will first perform preliminarily heating on the low-temperature air, and then enter the resistor tube for secondary heating to obtain an air temperature that meets the process requirements.

[0046] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A high-efficiency electric heater long-flow resistor tube element, characterized in that: It comprises a flange (1) and an electrode plate (9) which are arranged at intervals, wherein an "S"-shaped resistance tube which is arranged opposite to each other is installed between the flange (1) and the electrode plate (9). The structure of a single "S"-shaped resistor tube is: a first layer of resistor tubes, a second layer of resistor tubes and a third layer of resistor tubes are arranged in sequence from top to bottom, the tail of the first layer of resistor tubes is connected to the second layer of resistor tubes via a first adapter (7), the tail of the second layer of resistor tubes is connected to the third layer of resistor tubes via a second adapter (3), The head of the first layer of resistance tubes passes through the flange (1), and the tail of the third layer of resistance tubes passes through the electrode plate (9); A plurality of ceramic support members (4) are installed on the flange (1), the first layer resistor tube, the second layer resistor tube and the third layer resistor tube; the first layer resistor tube, the second layer resistor tube and the third layer resistor tube are all slender tubes, and each slender tube passes through a plurality of spaced ceramic support members (4); the first layer resistor tube, the second layer resistor tube and the third layer resistor tube all adopt a combined structure, and the head of the first layer resistor tube is connected to a first resistor tube joint (2), and the head of the first resistor tube joint (2) passes through the flange (1) and is connected to the flange (1) through the ceramic support member (4). ), the tail of the first resistor tube joint (2) is mounted with a first connection resistor tube (5) through a ceramic support member (4), the tail of the first connection resistor tube (5) is also mounted with a second connection resistor tube (6) through the ceramic support member (4), the tail of the second connection resistor tube (6) is mounted with a second layer resistor tube through a first adapter (7), the tail of the second layer resistor tube is mounted with a third layer resistor tube through a second adapter (3), the tail of the third layer resistor tube is connected to a second resistor tube joint (8), and the second resistor tube joint (8) passes through the electrode plate (9).

2. The high-efficiency electric heater long-flow resistor tube element according to claim 1, characterized in that: The structure of the ceramic support member (4) is as follows: it comprises a middle cylindrical structure (403), the two ends of the middle cylindrical structure (403) are respectively extended with a first cylindrical structure (401) and a second cylindrical structure (404), the first cylindrical structure (401), the middle cylindrical structure (403) and the second cylindrical structure (404) are simultaneously installed with a metal lining (402) inside, the metal lining (402) cooperates with the resistor tube; the first cylindrical structure (401), the middle cylindrical structure (403) and the second cylindrical structure (404) are all made of silicon carbide material or alumina ceramic material.

3. The high-efficiency electric heater long-flow resistor tube element according to claim 1, characterized in that: The wall thicknesses of the first layer resistor tube, the second layer resistor tube and the third layer resistor tube increase in sequence from small to large.

4. The high-efficiency electric heater long-flow resistor tube element according to claim 1, characterized in that: The wall thickness of the first layer of resistor tube is 1.6-1.8mm, the wall thickness of the second layer of resistor tube is 1.7-1.9mm, and the wall thickness of the third layer of resistor tube is 1.8-2mm.

5. The high-efficiency electric heater long-flow resistor tube element according to claim 1, characterized in that: The diameters of the first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes increase in sequence from small to large.

6. The high-efficiency electric heater long-flow resistor tube element according to claim 1, characterized in that: The diameter of the first layer of resistor tubes is 20 mm, the diameter of the second layer of resistor tubes is 21 mm, and the diameter of the third layer of resistor tubes is 22 mm.

7. The high-efficiency electric heater long-flow resistor tube element according to claim 1, characterized in that: A radiation tube is installed between the two "S"-shaped resistance tubes, one end of the radiation tube is connected to the flange (1), and the other end of the radiation tube is spaced apart from the electrode plate (9).

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