Segmented variable power resistance tube heating core structure

Abstract

The utility model discloses a sectional type variable power resistance tube heating core structure which comprises a plurality of sectional type variable power resistance tube assemblies which are arranged on a top layer fixing tube plate at equal intervals through front end fixing pieces and insulation limiting assemblies. A plurality of resistance heating tubes with different heating powers are adopted to form the sectional type variable power resistance tube assemblies, and the sectional type variable power resistance tube assemblies can be assembled according to actual requirements, so that the sectional type variable power resistance tube assemblies can be assembled according to the actual requirements, and the sectional type variable power resistance tube assemblies can be assembled according to the actual requirements. By adjusting the power of different intervals of the sectional type variable power resistance tube assembly, the utilization rate of the sectional type variable power resistance tube assembly in the length direction can be effectively improved, and the material cost is saved; the heating pipe wall temperature at the inlet end of the resistance heating pipe is increased, larger temperature driving force is provided for a heated medium, the temperature difference between the rear end temperature of the resistance heating pipe and the medium temperature is reduced, and the surface temperature is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of electric heater technology, specifically relating to a segmented variable power resistance tube heating core structure. Background Technology

[0002] Currently, in the fields of air, nitrogen, inert gas and other non-explosive gas heating in aerospace, steam turbine test benches and waste treatment industries, there is a need for gas temperatures that can be raised to above 800°C in a short time.

[0003] The above gas heating conditions share the following common requirements: 1. The heating equipment uses clean energy electric heating; 2. Extremely high flow resistance requirements for the medium; 3. High cleanliness requirements for the heated medium; 4. High temperature rise rate requirements for the medium; 5. High heat exchange efficiency requirements for the heating equipment; 6. Wide range of heating conditions; 7. Certain limitations on the size of the heating equipment; 8. Generally high heating power; 9. High heating temperature of the medium.

[0004] Currently, mainstream heaters on the market cannot simultaneously meet the above nine requirements, especially the flow resistance requirement, which is difficult to meet. Their heating range is also limited, necessitating the use of multiple heating devices connected in series or parallel to meet the demands. This results in excessively large equipment size and increased initial operating costs. Furthermore, due to the high heating temperatures, using a single device would inevitably result in a low unit load, again leading to bulky heating equipment and additional costs. In summary, current heaters have the following problems:

[0005] 1. Conventional resistance tube heating elements have constant power at both the front and back ends, and the surface load of the heating element is the same in both the high-temperature and low-temperature ranges. However, its temperature rise capability is relatively weak in the low-temperature range.

[0006] 2. Due to the low temperature of the inlet airflow, the temperature of the heating element on the cold fluid side is relatively low. Conventional resistance tube heating elements cannot locally increase their temperature and provide a greater temperature driving force to the heated medium.

[0007] 3. In the past, the heating element insulation limiting assembly at the top fixed tube sheet used a relatively complex insulation component to isolate the tube sheet and the heating element. Due to the material itself, such insulation components are difficult to process and have high usage costs.

[0008] 4. In the past, the intermediate insulation support plate assembly structure used a single thick plate with holes for support and limitation, which made the support plate assembly itself heavy and the material cost high.

[0009] Therefore, we propose a segmented variable power resistance tube heating core structure. Utility Model Content

[0010] The purpose of this invention is to provide a segmented variable power resistance tube heating core structure to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a segmented variable power resistance tube heating core structure, comprising,

[0012] The segmented variable power resistor tube assembly is provided in several parts, and the segmented variable power resistor tube assemblies are arranged at equal intervals on the top fixed tube plate through front end fixing parts and insulation limiting parts.

[0013] An intermediate insulation support assembly is provided, and several intermediate insulation support assemblies are provided, which are arranged between several segmented variable power resistor tube assemblies.

[0014] A tie rod assembly, wherein a plurality of tie rod assemblies are provided, and the plurality of tie rod assemblies are disposed between a plurality of intermediate insulating support assemblies.

[0015] Preferably, the segmented variable power resistance tube assembly includes a plurality of resistance heating tubes connected in sequence, the plurality of resistance heating tubes having the same inner diameter, and the length and wall thickness of the plurality of resistance heating tubes being designed and processed according to different heating powers.

[0016] Preferably, the outermost two resistance heating tubes are respectively provided with a front-end connector and a rear-end connector at their outer ends;

[0017] The front-end connector is positioned on the resistance heating tube at the location corresponding to the front-end fixing component.

[0018] The tail-end connector is positioned at the tail end of the resistance heating tube, corresponding to the position of the tail-end fixing piece.

[0019] Preferably, the insulating limiting assembly includes an insulating sleeve, an insulating pressure ring, a metal pressure ring, and a locking nut;

[0020] A through hole is provided on the top fixed tube plate corresponding to the position of the resistance heating tube. The front end fixing member is sleeved on the resistance heating tube and extends into the through hole. The insulating sleeve is sleeved on the front end fixing member corresponding to the position of the through hole. Both ends of the insulating sleeve are provided with insulating pressure rings that are limited and sleeved with the front end fixing member. Metal pressure rings are provided on the outer sides of the two insulating pressure rings. The lower end of the metal pressure ring is limited and snapped with the front end fixing member. A locking nut that is threadedly connected to the front end fixing member is provided on the upper metal pressure ring.

[0021] Preferably, the intermediate insulation support assembly includes a support plate, a fastening bolt limiting ring, fastening bolts, a support insulation ring, a tie rod limiting ring, and a tie rod connecting end;

[0022] The support plate is provided in two parts, and the two support plates are separated and fixed by the fastening bolt limiting ring and the pull rod limiting ring. The fastening bolt limiting ring and the pull rod limiting ring are respectively fixedly connected to the two support plates by the fastening bolt and the pull rod connecting end, respectively.

[0023] A plurality of supporting insulating rings are provided at equal intervals between the two supporting plates, and the resistance heating tube is sleeved inside the supporting insulating rings.

[0024] Preferably, the support plate is a thin sheet metal support plate.

[0025] Preferably, the tie rod assembly includes a connecting tie rod and a tie rod fastening nut;

[0026] The connecting rod is positioned between the two intermediate insulating support components via a connecting rod end, and the connecting rod end is fixed to the support plate by a connecting rod fastening nut.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. This utility model uses several resistance heating tubes with different heating powers to form a segmented variable power resistance tube assembly. In the design process of the resistance heating tube, the wall thickness and length of the resistance heating tube are set manually to control the axial resistance difference of the resistance heating tube. The power of different sections of the segmented variable power resistance tube assembly can be adjusted according to actual needs, which can effectively improve the utilization rate of the segmented variable power resistance tube assembly in the length direction and save material costs. It increases the wall temperature of the heating tube at the inlet end of the resistance heating tube, giving the heated medium a greater temperature driving force. After the medium temperature at the rear end is heated, it is already at a high temperature. By reducing the power of the rear end of the resistance heating tube, the temperature difference between the temperature of the medium and the temperature of the medium is reduced, thereby reducing the surface temperature of the medium.

[0029] 2. This utility model uses two thin sheet-like support plates to support the fastening bolt limiting pressure ring, the support insulation ring and the pull rod limiting pressure ring, so as to achieve effective insulation and fixation of the segmented variable power resistor tube assembly, effectively reduce the weight of the support plate, avoid the support plate from softening due to its own weight at high temperature, and reduce material costs.

[0030] 3. This utility model uses an insulating limit component and a pull rod component to insulate and fix the segmented variable power resistor tube assembly. It reasonably optimizes the structure of the insulating component, optimizes the relatively complex structure of the insulating component, reduces the processing difficulty, reduces material waste, reduces manufacturing costs, and improves the connection stability of the segmented variable power resistor tube assembly. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the insulating limiting component of this utility model;

[0033] Figure 3 This is a schematic diagram of the intermediate insulation support assembly of this utility model;

[0034] Figure 4 This is a schematic diagram of the segmented variable power resistor assembly of this utility model;

[0035] Figure 5 This is a schematic diagram of the tie rod assembly of this utility model.

[0036] In the diagram: 1. Segmented variable power resistor tube assembly; 101. Resistance heating tube; 2. Front end fixing component; 3. Insulation limiting component; 301. Insulation sleeve; 302. Insulation pressure ring; 303. Metal pressure ring; 304. Locking nut; 4. Top layer fixing tube plate; 5. Intermediate insulation support component; 501. Support plate; 502. Fastening bolt limiting pressure ring; 503. Fastening bolt; 504. Support insulation ring; 505. Pull rod limiting pressure ring; 506. Pull rod connecting end; 6. Pull rod assembly; 601. Connecting pull rod; 602. Pull rod fastening nut; 7. Front end connector; 8. Tail end connector; 9. Tail end fixing component. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Please see Figures 1-5 The segmented variable power resistance tube heating core structure provided by this utility model includes,

[0039] The segmented variable power resistor tube assembly 1 comprises several segments, which are evenly spaced on the top fixed tube plate 4 via front-end fixing parts 2 and insulating limiting parts 3. Each segmented variable power resistor tube assembly 1 includes several resistance heating tubes 101 connected in sequence. The inner diameter of each resistance heating tube 101 is the same, and the length and wall thickness of each resistance heating tube 101 are designed and processed according to different heating powers. The outermost two resistance heating tubes 101 are respectively provided with a front-end connecting piece 7 and a tail-end connecting piece 8. The front-end connecting piece 7 is located on the resistance heating tube 101 at the position corresponding to the front-end fixing part 2. The tail-end connecting piece 8 is located at the tail of the resistance heating tube 101 at the position corresponding to the tail-end fixing part 9.

[0040] This utility model uses several resistance heating tubes 101 with different heating powers to form a segmented variable power resistance tube assembly 1. In the design process of the resistance heating tube 101, the axial resistance difference of the resistance heating tube 101 is controlled by manually setting the wall thickness and length of the resistance heating tube 101. Since the two sections of resistance are equivalent to being connected in series, the current flowing through them is the same. When one section has a higher resistance, the corresponding power will be greater, and when the resistance is lower, the corresponding power will be smaller.

[0041] In actual heating process, the temperature of the resistance heating tube 101 at the medium inlet side is relatively low, and the resistance heating tube 101 can withstand a large unit surface load. The temperature of the resistance heating tube 101 at the outlet end is relatively high, and the resistance heating tube 101 cannot withstand a large unit surface load, so the resistance value needs to be reduced accordingly. Different power can be set according to different temperature ranges to control the unit surface load of the resistance heating tube 101. This segmented resistance heating tube 101 is not limited to two segments and can be added according to actual conditions. The power of different ranges of the segmented variable power resistance tube assembly 1 can be adjusted according to actual needs, which can effectively improve the utilization rate of the segmented variable power resistance tube assembly 1 in the length direction and save material costs.

[0042] Because the inlet gas temperature of the resistance heating tube 101 is low, the temperature of the resistance heating tube 101 on the cold fluid side is relatively low. A larger power can be set at the inlet end of the resistance heating tube 101, thereby greatly increasing the wall temperature of the heating tube at the inlet end of the resistance heating tube 101 and giving the heated medium a greater temperature driving force. After the medium at the rear end is heated, it is already at a high temperature. By reducing the power at the rear end of the resistance heating tube 101, the temperature difference between the temperature of the medium and the temperature of the medium is reduced, thereby reducing its surface temperature.

[0043] The insulating limiting assembly 3 includes an insulating sleeve 301, an insulating pressure ring 302, a metal pressure ring 303, and a locking nut 304. A through hole is provided on the top fixed tube plate 4 at the position corresponding to the resistance heating tube 101. The front fixing member 2 is sleeved on the resistance heating tube 101 and extends into the through hole. The insulating sleeve 301 is sleeved on the front fixing member 2 at the position corresponding to the through hole. Both ends of the insulating sleeve 301 are provided with insulating pressure rings 302 that are limited and sleeved with the front fixing member 2. A metal pressure ring 303 is provided on the outer side of both insulating pressure rings 302. The lower end of the metal pressure ring 303 is limited and snapped with the front fixing member 2. A locking nut 304 that is threadedly connected to the front fixing member 2 is provided on the upper metal pressure ring 303.

[0044] Intermediate insulation support assembly 5, of which several intermediate insulation support assemblies 5 are provided, and several intermediate insulation support assemblies 5 are arranged between several segmented variable power resistor tube assemblies 1. The intermediate insulation support assembly 5 includes a support plate 501, a fastening bolt limiting ring 502, a fastening bolt 503, a support insulation ring 504, a pull rod limiting ring 505, and a pull rod connecting end 506. There are two support plates 501, which are separated and fixed by the fastening bolt limiting ring 502 and the pull rod limiting ring 505. The fastening bolt limiting ring 502 and the pull rod limiting ring 505 are respectively fixedly connected to the two support plates 501 by the fastening bolt 503 and the pull rod connecting end 506. Several support insulation rings 504 are arranged at equal intervals between the two support plates 501. The resistance heating tube 101 is sleeved in the support insulation ring 504. The support plate 501 is a thin sheet metal support plate.

[0045] This utility model uses two thin sheet-like support plates 501 to support the fastening bolt limiting pressure ring 502, the support insulation ring 504 and the pull rod limiting pressure ring 505, so as to achieve effective insulation and fixation of the segmented variable power resistor tube assembly 1, effectively reduce the weight of the support plate, avoid the support plate from becoming soft and sagging due to its own weight at high temperature, and reduce material costs at the same time.

[0046] A pull rod assembly 6 is provided, and several pull rod assemblies 6 are arranged between several intermediate insulating support assemblies 5. The pull rod assembly 6 includes a connecting pull rod 601 and a pull rod fastening nut 602. The connecting pull rod 601 is arranged between two intermediate insulating support assemblies 5 through a pull rod connecting end 506, and the pull rod connecting end 506 is fixedly arranged on the support plate 501 through the pull rod fastening nut 602.

[0047] This utility model uses an insulating limit component 3 and a pull rod component 6 to insulate and fix the segmented variable power resistor tube assembly 1. It reasonably optimizes the structure of the insulating component, optimizes the relatively complex structure of the insulating component, reduces the processing difficulty, reduces material waste, reduces manufacturing costs, and improves the connection stability of the segmented variable power resistor tube assembly 1.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A segmented variable power resistance tube heating core structure, characterized in that, include, Segmented variable power resistor tube assembly (1), wherein a plurality of segmented variable power resistor tube assemblies (1) are provided, and the plurality of segmented variable power resistor tube assemblies (1) are arranged at equal intervals on the top fixed tube plate (4) through front end fixing member (2) and insulation limiting member (3). Intermediate insulation support assembly (5), wherein a plurality of intermediate insulation support assemblies (5) are provided, and the plurality of intermediate insulation support assemblies (5) are disposed between the plurality of segmented variable power resistor tube assemblies (1); A pull rod assembly (6) is provided in a plurality of such pull rod assemblies (6), and the plurality of pull rod assemblies (6) are arranged between the plurality of intermediate insulating support assemblies (5).

2. The segmented variable power resistance tube heating core structure according to claim 1, characterized in that: The segmented variable power resistance tube assembly (1) includes a number of resistance heating tubes (101) connected in sequence. The inner diameter of the number of resistance heating tubes (101) is the same, and the length and wall thickness of the number of resistance heating tubes (101) are designed and processed according to different heating powers.

3. The segmented variable power resistance tube heating core structure according to claim 2, characterized in that: The outermost two resistance heating tubes (101) are respectively provided with a front-end connector (7) and a tail-end connector (8). The front-end connector (7) is positioned on the resistance heating tube (101) at the position corresponding to the front-end fixing member (2); The tail end connector (8) is positioned at the tail end of the resistance heating tube (101) corresponding to the tail end fixing piece (9).

4. The segmented variable power resistance tube heating core structure according to claim 3, characterized in that: The insulating limiting assembly (3) includes an insulating sleeve (301), an insulating pressure ring (302), a metal pressure ring (303), and a locking nut (304). A through hole is provided on the top fixed tube plate (4) at the position corresponding to the resistance heating tube (101). The front end fixing member (2) is sleeved on the resistance heating tube (101) and extends into the through hole. The insulating sleeve (301) is sleeved on the front end fixing member (2) at the position corresponding to the through hole. Both ends of the insulating sleeve (301) are provided with insulating pressure rings (302) that are limited and sleeved with the front end fixing member (2). Metal pressure rings (303) are provided on the outer side of the two insulating pressure rings (302). The lower end of the metal pressure ring (303) is limited and snapped with the front end fixing member (2). The upper metal pressure ring (303) is provided with a locking nut (304) that is threadedly connected to the front end fixing member (2).

5. The segmented variable power resistance tube heating core structure according to claim 2, characterized in that: The intermediate insulation support assembly (5) includes a support plate (501), a fastening bolt limiting ring (502), a fastening bolt (503), a support insulation ring (504), a pull rod limiting ring (505), and a pull rod connecting end (506). Two support plates (501) are provided. The two support plates (501) are separated and fixed by the fastening bolt limiting ring (502) and the pull rod limiting ring (505). The fastening bolt limiting ring (502) and the pull rod limiting ring (505) are respectively fixedly connected to the two support plates (501) by the fastening bolt (503) and the pull rod connecting end (506). A plurality of support insulating rings (504) are provided at equal intervals between the two support plates (501), and the resistance heating tube (101) is sleeved inside the support insulating rings (504).

6. The segmented variable power resistance tube heating core structure according to claim 5, characterized in that: The support plate (501) is a thin sheet metal support plate.

7. The segmented variable power resistance tube heating core structure according to claim 5, characterized in that: The pull rod assembly (6) includes a connecting pull rod (601) and a pull rod fastening nut (602). The connecting rod (601) is set between the two intermediate insulating support components (5) through the connecting rod end (506), and the connecting rod end (506) is fixed on the support plate (501) by the connecting rod fastening nut (602).

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