High-efficiency detachable electric heater heat source component with filtering function

Abstract

A highly efficient and detachable electric heater heat source component with filtering function includes a heat source component, and multiple heat source components are installed in cooperation with the interior of the electric heater. The structure of a single heat source component is: a tube shell with a cylindrical structure, the two ports of the tube shell are open, a flange is fixed to one end of the tube shell, and a plurality of first long strip holes are spaced apart on the tube wall in the circumferential direction of the other end of the tube shell, and a cone structure is installed in cooperation with the end; a resistor tube element is installed in cooperation with the tube shell, and the installation structure of the resistor tube element is: an electrode plate parallel to the flange is also provided inside the tube shell, and an "S"-shaped resistor tube is installed between the flange and the electrode plate. By adopting a component-type structure, during maintenance, there is no need to pull out the entire electric heating component, and only one of the damaged components needs to be pulled out, which greatly reduces the workload, and the maintenance is fast, efficient, and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of electric heaters, in particular to a highly efficient detachable electric heater heat source component with a filtering function. 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 electric heater in the prior art has a complex structure and uses an integral electric heating component inside. When the equipment fails, the entire electric heating component inside needs to be pulled out and the whole core is pulled out. The maintenance workload is huge, the time cycle is long, the work is cumbersome, the maintenance cost is high, and the heating effect is poor. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured, efficient and detachable electric heater heat source component with filtering function, which can be easily repaired by simply pulling out one of the damaged components without having to pull out the entire electric heating component, thereby greatly reducing the workload and making maintenance quick and efficient.

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

[0006] A high-efficiency detachable electric heater heat source component with filtering function, comprising a heat source component, a plurality of heat source components are cooperatively installed inside the electric heater,

[0007] The structure of a single heat source assembly is: a tube shell of a cylindrical structure, the two ends of the tube shell are open, a flange is fixed to one end of the tube shell, a plurality of first long strip holes are spaced apart on the tube wall in the circumferential direction of the other end of the tube shell, and a cone structure is installed at the end;

[0008] The tube shell is equipped with a resistor tube element.

[0009] The installation structure of the resistor tube element is as follows: an electrode plate parallel to the flange is also arranged inside the tube shell, and an "S"-shaped resistor tube is installed between the flange and the electrode plate.

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

[0011] The individual heat source components are extracted from the electric heater.

[0012] The resistance tube element inside the single heat source assembly is withdrawn from the tube shell.

[0013] The cone structure is provided with a plurality of second elongated holes spaced evenly apart.

[0014] 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, the tail of the second layer of resistor tubes is connected to the third layer of resistor tubes through a second adapter, the head of the first layer of resistor tubes passes through the flange, and the tail of the third layer of resistor tubes passes through the electrode plate; a plurality of spaced ceramic support members are installed on the flange, the first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes.

[0015] The total length of the first layer of resistor tubes, the second layer of resistor tubes and the third layer of resistor tubes is three times the length of a single resistor tube.

[0016] The exterior of the ceramic support is made of silicon nitride material or alumina ceramic material, and a metal lining is arranged inside, and the metal lining cooperates with the resistor tube of each layer.

[0017] The wall thickness and diameter of the first layer resistor tube, the second layer resistor tube and the third layer resistor tube are increased in sequence from small to large.

[0018] The wall thickness of the first layer of resistor tube is 1.6-1.8 mm, the wall thickness of the second layer of resistor tube is 1.7-1.9 mm, and the wall thickness of the third layer of resistor tube is 1.8-2 mm.

[0019] 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.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention has a compact and reasonable structure and is easy to operate. By adopting a component-type structure, the heat source components inside the electric heater are arranged as independent component structures. When maintenance is required, there is no need to pull out all the electric heating components, but only one of the damaged components needs to be pulled out, which greatly reduces the workload, makes maintenance fast, efficient and low-cost.

[0022] The present invention adopts GH3030 resistance tube as the heating source, and the heating core is a multi-group parallel structure. Each group of heating elements can be independently pulled out. A single heating component is light in weight and has a fast heating and cooling rate (under the condition of a certain heating power, the heating and cooling rate of an object is inversely proportional to its weight, that is, the lighter the weight, the higher the heating and cooling rate). At the same time, the heating component is light in weight, which can reduce the difficulty of maintenance. The outlet temperature of the medium is relatively high. In order to meet the long-term working life, the electric heating element must be able to withstand high temperature. The material can withstand a high temperature of 1200°C for a short time. When the working temperature is ≤900°C and the pressure difference between the inside and outside of the tube is ≤30KPa (the difference from the conventional use condition is that the large internal pressure at high temperature will cause the resistance tube to swell, so not only the high temperature resistance performance should be considered, but also its high temperature strength). It can work stably for a long time.

[0023] The present invention adopts an "S"-shaped resistor tube to reduce the length of the heating core to 1 / 3 of the original length, effectively reducing 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 under stress.

[0024] The "S"-shaped resistor tube structure described in the present invention can greatly improve the heat exchange efficiency.

[0025] 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.

[0026] 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.

[0027] In actual use, the present invention adopts external circulating water or heat-conducting oil cooling for the electrode, and will not cause damage to the ceramic due to internal cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an application diagram of the present invention.

[0029] Figure 2 This is an application diagram (partial view) of the present invention.

[0030] Figure 3 Schematic diagram of the structure of a single tube shell of the present invention (Example 1).

[0031] Figure 4 Schematic diagram of the structure of a single tube shell of the present invention (Example 2).

[0032] Figure 5 It is a schematic diagram of the structure of the resistor tube element of the present invention.

[0033] Among them: 1. Sealing cover; 2. Sealing cover connector; 3. Flange; 4. Heat source assembly; 5. Support plate; 6. Inner shell; 7. Outer shell; 8. First layer resistor tube; 9. Second adapter; 10. Ceramic support; 11. Second layer resistor tube; 12. Third layer resistor tube; 13. First adapter; 14. Electrode plate;

[0034] 401, tube shell; 402, first elongated hole; 403, cone structure; 404, second elongated hole. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0036] like Figure 1-Figure 5 As shown, the heat source assembly of the highly efficient and detachable electric heater with filtering function of this embodiment includes a heat source assembly 4. A plurality of heat source assemblies 4 are cooperatively installed inside the electric heater.

[0037] The electric heater only needs to include an inner shell 6, and a plurality of support plates 5 are installed at intervals inside the inner shell 6. A circular hole is opened on the support plate 5 to pass through the heat source component 4. Each heat source component 4 passes through each support plate 5. A cover connector 2 extends from one end of the inner shell 6. The cover connector 2 is connected to the cover 1 by a fastener. An outer shell 7 is arranged on the outside of the inner shell 6, and a connecting hole is opened at the other end of the inner shell 6 and the outer shell 7.

[0038] The structure of a single heat source assembly 4 is as follows: a tube shell 401 having a cylindrical structure, the two ends of the tube shell 401 are open, a flange 3 is fixed to one end of the tube shell 401, a plurality of first long strip holes 402 are spaced apart on the tube wall in the circumferential direction of the other end of the tube shell 401, and a cone structure 403 is installed at the end;

[0039] The tube shell 401 is equipped with a resistor element.

[0040] The installation structure of the resistor tube element is as follows: an electrode plate 14 parallel to the flange 3 is also arranged inside the tube shell 401, and an "S"-shaped resistor tube is installed between the flange 3 and the electrode plate 14 so as to be relatively arranged.

[0041] A single heat source assembly 4 is extracted from the electric heater.

[0042] The resistance tube element inside a single heat source assembly 4 is pulled out from the tube shell 401.

[0043] The cone structure 403 is provided with a plurality of second elongated holes 404 which are evenly spaced apart.

[0044] The structure of a single "S"-shaped resistor tube is as follows: a first-layer resistor tube 8, a second-layer resistor tube 11 and a third-layer resistor tube 12 are arranged in sequence from top to bottom, the tail of the first-layer resistor tube 8 is connected to the second-layer resistor tube 11 through a first adapter 13, the tail of the second-layer resistor tube 11 is connected to the third-layer resistor tube 12 through a second adapter 9, the head of the first-layer resistor tube 8 passes through the flange 3, and the tail of the third-layer resistor tube 12 passes through the electrode plate 14; a plurality of spaced ceramic support members 10 are installed on the flange 3, the first-layer resistor tube 8, the second-layer resistor tube 11 and the third-layer resistor tube 12.

[0045] The total length of the first layer of resistor tubes 8, the second layer of resistor tubes 11 and the third layer of resistor tubes 12 is three times the length of a single resistor tube.

[0046] The exterior of the ceramic support 10 is made of silicon nitride material or alumina ceramic material, and a metal lining is provided inside, and the metal lining cooperates with the resistor tubes of each layer.

[0047] The wall thickness and diameter of the first layer resistor tube 8, the second layer resistor tube 11 and the third layer resistor tube 12 are increased in sequence from small to large.

[0048] The wall thickness of the first layer of resistor tube 8 is 1.6-1.8 mm, the wall thickness of the second layer of resistor tube 11 is 1.7-1.9 mm, and the wall thickness of the third layer of resistor tube 12 is 1.8-2 mm.

[0049] The diameter of the first layer resistor tube 8 is 20 mm, the diameter of the second layer resistor tube 11 is 21 mm, and the diameter of the third layer resistor tube 12 is 22 mm.

[0050] During actual use, when it is found that one set of heat source components 4 is damaged or malfunctions, it is only necessary to stop the machine, open the cover 1, remove the damaged heat source component 4, and repair it. After the repair, it can be installed again.

[0051] During maintenance, only the resistor tube element inside the tube shell 401 can be removed for maintenance, and then the tube shell 401 can be installed again after maintenance. This effectively avoids the troublesome operation of removing the entire core body in the prior art, greatly reduces the workload, and facilitates maintenance.

[0052] The design of the tube shell 401 described in the present invention has a first elongated hole 402 in the circumferential direction of the tail portion, and a second elongated hole 404 on the conical structure 403. When the ceramic support 10 inside the tube shell 401 is damaged, the broken pieces will not flow out with the strong airflow, but can fall into the tube shell 401, thereby playing a better filtering and protective role.

[0053] The present invention adopts a first layer of resistor tube 8 with a small diameter, a second layer of resistor tube 11 with a medium diameter, and a third layer of resistor tube 12 with a large diameter. The principle is: the first layer of resistor tube 8 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 condition, 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, the equipment cost can be reduced, space can be saved, and the equipment volume can be reduced. 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 resistivity of the third layer is small.

[0054] The present invention can also add a radiation tube (not shown in the figure) between the two "S"-shaped resistor tubes. One end of the radiation tube (not shown in the figure) is connected to the flange 3, and the other end is suspended on the inner side of the electrode plate 14. The design of the radiation tube (not shown in the figure) is high temperature resistant and has high radiation and receiving radiation rates. It is used to supplement the circulation channel when the equipment requires a larger circulation cross-section. This tube is not connected to the power supply, and is radiantly heated by the circumferentially distributed energized resistor tubes, so as to increase the heat transfer area and the circulation channel and reduce the temperature of the heating combination element.

[0055] Control the maximum gas flow rate in each resistance tube to ≤35m / s.

[0056] Control the pressure drop inside the tube to ≤30KPa. A large internal pressure at high temperature will cause the resistor tube to swell.

[0057] Reduce the support span of the resistor tube, and the unsupported span between 5 adjacent support plates is ≤350mm

[0058] The gap size of the ceramic support 10 is reasonably designed to reduce the thermal shock of the ceramic and resist the flow impact force of the resistor tube on the ceramic. Silicon nitride ceramic is used as the supporting ceramic and the ceramic is lined with a metal sleeve as a protective structure. The metal liner is integrally molded and there are gaps between it and the resistor tube and silicon nitride ceramic respectively.

[0059] 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 highly efficient and detachable electric heater heat source assembly with filtering function, characterized in that: It comprises a heat source component (4), wherein a plurality of heat source components (4) are cooperatively installed inside the electric heater. The structure of a single heat source component (4) is as follows: it comprises a tube shell (401) of a cylindrical structure, the two ends of the tube shell (401) are open, a flange (3) is fixed to one end of the tube shell (401), a plurality of first long strip holes (402) are spaced apart on the tube wall in the circumferential direction of the other end of the tube shell (401), and a conical structure (403) is mounted on the end in cooperation; A resistor tube element is installed in the tube shell (401). The installation structure of the resistor tube element is as follows: an electrode plate (14) parallel to the flange (3) is also arranged inside the tube shell (401); an "S"-shaped resistor tube is installed between the flange (3) and the electrode plate (14) and is arranged opposite to each other; a plurality of second long strip holes (404) are opened on the cone structure (403) at even intervals; the structure of a single "S"-shaped resistor tube is as follows: a first layer of resistor tubes (8), a second layer of resistor tubes (11) and a third layer of resistor tubes (12) are arranged in sequence from top to bottom, and the first layer The tail of the resistor tube (8) is connected to the second layer resistor tube (11) via a first adapter (13), the tail of the second layer resistor tube (11) is connected to the third layer resistor tube (12) via a second adapter (9), the head of the first layer resistor tube (8) passes through the flange (3), and the tail of the third layer resistor tube (12) passes through the electrode plate (14); a plurality of spaced ceramic support members (10) are installed on the flange (3), the first layer resistor tube (8), the second layer resistor tube (11) and the third layer resistor tube (12).

2. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: A single heat source assembly (4) is extracted from the electric heater.

3. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: The resistance tube element inside a single heat source assembly (4) is pulled out from the tube shell (401).

4. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: The total length of the first layer of resistor tubes (8), the second layer of resistor tubes (11) and the third layer of resistor tubes (12) is three times the length of a single resistor tube.

5. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: The ceramic support (10) is made of silicon nitride material or alumina ceramic material on the outside, and is provided with a metal lining on the inside, the metal lining being matched with the resistor tubes of each layer.

6. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: The wall thickness and diameter of the first layer resistor tube (8), the second layer resistor tube (11) and the third layer resistor tube (12) all increase in sequence from small to large.

7. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: The wall thickness of the first layer of resistor tube (8) is 1.6-1.8 mm, the wall thickness of the second layer of resistor tube (11) is 1.7-1.9 mm, and the wall thickness of the third layer of resistor tube (12) is 1.8-2 mm.

8. The high-efficiency detachable electric heater heat source assembly with filtering function as claimed in claim 1, characterized in that: The diameter of the first layer of resistor tubes (8) is 20 mm, the diameter of the second layer of resistor tubes (11) is 21 mm, and the diameter of the third layer of resistor tubes (12) is 22 mm.

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