Longitudinal flow hollow ring electric heater

Abstract

The utility model discloses a longitudinal flow hollow ring electric heater, which comprises an outer guide cylinder and an electric heater cylinder body, the outer guide cylinder is communicated with the electric heater cylinder body, one end of the electric heater cylinder body facing the outer guide cylinder is provided with a beveled inlet, and the beveled inlet extends into the outer guide cylinder; a plurality of electric heating pipes distributed in the circulation direction of the electric heater cylinder are arranged in the electric heater cylinder through a hollow ring supporting assembly, and a longitudinal heating flow channel is formed between the plurality of electric heating pipes and the electric heater cylinder. The arrangement of the heating pipes is not affected, the problems of large local flow velocity and large pressure drop in an inlet area are avoided, the hollow ring supporting structure changes fluid into longitudinal flow, flow resistance is reduced, the resonance influence of gas and the electric heating pipes is effectively restrained, machining and manufacturing are easy, and the application range is wide.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric heaters, and in particular relates to a longitudinal flow hollow ring electric heater. Background Art

[0002] The existing electric heaters mainly adopt: bow-shaped baffle electric heaters, support mesh electric heaters, disc-ring baffles and other forms. At present, the electric heaters for gas heating in the industrial field mainly use a single bow baffle to support the tube bundle. The main disadvantages are that the gas flow rate is relatively large, and the fully arranged electric heating pipe area at the inlet will lead to a large local pressure drop and uneven gas distribution. The fluid resistance caused in the baffle area is large and there is a heating dead zone. The shell-side pressure drop is high, the vibration resistance is poor, and the adaptability is not strong, which cannot meet most application conditions. For this reason, we propose a longitudinal flow hollow ring electric heater. Utility Model Content

[0003] The utility model aims to provide a longitudinal flow hollow ring electric heater to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a longitudinal flow hollow ring electric heater, comprising an outer guide tube and an electric heater cylinder, the outer guide tube and the electric heater cylinder are connected, and an oblique inlet is provided on one end of the electric heater cylinder facing the outer guide tube, and the oblique inlet extends to the interior of the outer guide tube;

[0005] The interior of the electric heater cylinder is provided with a plurality of electric heating tubes distributed along the flow direction of the electric heater cylinder through a hollow ring support assembly, and a longitudinal heating flow channel is formed between the plurality of electric heating tubes and the electric heater cylinder.

[0006] Preferably, the outer guide tube and the electric heater cylinder are both annular structures, and the cross-sectional area of ​​the outer guide tube is larger than the cross-sectional area of ​​the electric heater cylinder.

[0007] Preferably, a gas inlet is provided on the outer guide tube, the most convex end of the beveled inlet is aligned with the outer circle of the gas inlet, and the beveled surface of the beveled inlet is distributed opposite to the gas inlet.

[0008] Preferably, a plurality of the hollow ring support assemblies are provided, and the plurality of the hollow ring support assemblies are arranged at equal intervals inside the cylinder of the electric heater.

[0009] Preferably, the hollow ring support assembly comprises a hollow ring and reinforcing ribs;

[0010] There are a plurality of hollow rings, which are evenly distributed in the cross-sectional direction of the electric heater cylinder, and are connected by the reinforcing ribs;

[0011] A plurality of the electric heating tubes are arranged between a plurality of the hollow rings and the electric heater cylinder.

[0012] Preferably, the hollow ring is a short-section hollow steel pipe.

[0013] Preferably, a gas outlet is provided on one end of the electric heater cylinder away from the oblique inlet.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model is provided with an outer guide tube and an oblique inlet. The outer guide tube is used to distribute the gas to be heated in an annular manner, which has the characteristics of low resistance and good distribution effect. The oblique inlet prevents the gas to be heated from directly flushing the electric heating tube, which protects the electric heating tube on the one hand and reduces the gas resistance and the gas flow rate at the inlet of the electric heater cylinder on the other hand, prolongs the service life of the peripheral electric heating tube, reduces the flow and heat transfer dead zone, and improves the heat transfer performance.

[0016] 2. The utility model adopts hollow rings and reinforcing ribs as supporting structures to form a longitudinal flow pattern inside the cylinder of the electric heater, so that the gas axially heats the tube, promotes the turbulence of the fluid in the cross section of the heating tube, and serves as a heating tube support to support all heating tubes, playing an anti-vibration role. The gas passes through the hollow ring to form a jet, disturbs the gas, strengthens the heat transfer, and has the characteristics of low resistance and good anti-vibration effect. At the same time, the diameter of the hollow ring and the distance of the hollow ring support group can be designed according to the fluid characteristics by calculating the fluid thermodynamics;

[0017] 3. Compared with other baffle plate heaters, the longitudinal flow hollow ring electric heater of the utility model not only avoids the previous cross-flow dead zone that easily leads to local overheating of the electric heating element, but also adopts a hollow ring support structure to greatly reduce gas resistance. Since the heat transfer performance of the hollow ring heater of the present invention is improved and the heating temperature is uniform, the load of the electric heating tube element can be increased under certain heat load conditions, so it is compact in size, saves equipment and consumables, and reduces investment and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0019] Figure 2 It is a partial cross-sectional structural schematic diagram of the utility model;

[0020] Figure 3It is a schematic diagram of the distribution structure of the hollow ring support assembly and the electric heating tube of the utility model;

[0021] Figure 4 It is a partial cross-sectional structural schematic diagram of the utility model.

[0022] In the figure: 1. outer guide tube; 2. electric heater cylinder; 3. oblique inlet; 4. hollow ring support assembly; 401. hollow ring; 402. reinforcing rib; 5. electric heating tube; 6. gas inlet; 7. gas outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 4 The utility model provides a longitudinal flow hollow ring electric heater, comprising an outer guide tube 1 and an electric heater cylinder 2, the outer guide tube 1 and the electric heater cylinder 2 are connected, the outer guide tube 1 and the electric heater cylinder 2 are both annular structures, and the cross-sectional area of ​​the outer guide tube 1 is larger than the cross-sectional area of ​​the electric heater cylinder 2, and an oblique inlet 3 is provided on the electric heater cylinder 2 at one end facing the outer guide tube 1, the oblique inlet 3 extends to the inside of the outer guide tube 1, a gas inlet 6 is provided on the outer guide tube 1, the most convex end of the oblique inlet 3 is aligned with the outer circle of the gas inlet 6, and the oblique surface of the oblique inlet 3 is distributed opposite to the gas inlet 6, and a gas outlet 7 is provided on the end of the electric heater cylinder 2 away from the oblique inlet 3;

[0025] The interior of the electric heater cylinder 2 is provided with a plurality of electric heating tubes 5 distributed along the flow direction of the electric heater cylinder 2 through a hollow ring support assembly 4, a plurality of hollow ring support assemblies 4 are provided, and the plurality of hollow ring support assemblies 4 are evenly spaced inside the electric heater cylinder 2, and the hollow ring support assembly 4 includes a hollow ring 401 and a reinforcing rib 402; a plurality of hollow rings 401 are provided, and the plurality of hollow rings 401 are evenly distributed in the cross-sectional direction of the electric heater cylinder 2, and the plurality of hollow rings 401 are connected by reinforcing ribs 402; a plurality of electric heating tubes 5 are provided between the plurality of hollow rings 401 and the electric heater cylinder 2, and the hollow rings 401 are short-section hollow steel pipes, and a longitudinal heating flow channel is formed between the plurality of electric heating tubes 5 and the electric heater cylinder 2.

[0026] The utility model is provided with an outer guide tube 1 and an oblique inlet 3. The outer guide tube 1 is used to perform annular distribution of the gas to be heated, which has the characteristics of low resistance and good distribution effect. The oblique inlet 3 prevents the gas to be heated from directly flushing the electric heating tube 5, which protects the electric heating tube 5 on the one hand and reduces the gas resistance on the other hand, reduces the gas flow rate at the inlet of the electric heater cylinder 2, prolongs the service life of the peripheral electric heating tube, reduces the flow and heat transfer dead zone, and improves the heat transfer performance.

[0027] The utility model adopts the hollow ring 401 and the reinforcing rib 402 as the supporting structure, so that a longitudinal flow pattern is formed inside the electric heater cylinder 2, so that the gas axially heats the tube, promotes the turbulence of the fluid in the cross section of the heating tube, and serves as a heating tube support to support all the heating tubes, playing an anti-vibration role. The gas passes through the hollow ring to form a jet, disturbs the gas, strengthens the heat transfer, and has the characteristics of low resistance and good anti-vibration effect. At the same time, the diameter of the hollow ring and the distance of the hollow ring support group can be designed according to the fluid characteristics by calculating the fluid thermodynamics;

[0028] Compared with other baffle plate heaters, the longitudinal flow hollow ring electric heater of the utility model not only avoids the previous cross-flow dead zone that easily leads to local overheating of the electric heating element, but also adopts a hollow ring support structure to greatly reduce gas resistance. Since the heat transfer performance of the hollow ring heater of the present invention is improved and the heating temperature is uniform, the load of the electric heating tube element can be increased under certain heat load conditions, so it is compact in size, saves equipment and consumables, and reduces investment and operating costs.

[0029] To sum up, the method of use provided in this embodiment is: the gas to be heated enters the outer guide tube 1 from the gas inlet 6, and then cooperates with the bevel inlet 3 to distribute the gas to be heated, so that the gas to be heated enters the electric heater cylinder 2, and at this time the electric heating tube 5 starts to heat the gas to be heated, and the gas to be heated flows longitudinally in the electric heating tube 5 and the hollow ring 401 to complete the gas heating, and then is discharged from the gas outlet 7.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A longitudinal flow hollow ring electric heater, characterized in that: The electric heater cylinder (2) comprises an outer guide tube (1) and an electric heater cylinder (2), wherein the outer guide tube (1) and the electric heater cylinder (2) are connected to each other, and an oblique inlet (3) is provided on one end of the electric heater cylinder (2) facing the outer guide tube (1), and the oblique inlet (3) extends to the interior of the outer guide tube (1); The interior of the electric heater cylinder (2) is provided with a plurality of electric heating tubes (5) distributed along the flow direction of the electric heater cylinder (2) via a hollow ring support assembly (4), and a longitudinal heating flow channel is formed between the plurality of electric heating tubes (5) and the electric heater cylinder (2).

2. A longitudinal flow hollow ring electric heater according to claim 1, characterized in that: The outer flow guide tube (1) and the electric heater cylinder (2) are both annular structures, and the cross-sectional area of ​​the outer flow guide tube (1) is larger than the cross-sectional area of ​​the electric heater cylinder (2).

3. A longitudinal flow hollow ring electric heater according to claim 1, characterized in that: The outer guide tube (1) is provided with a gas inlet (6), the most convex end of the beveled inlet (3) is aligned with the outer circle of the gas inlet (6), and the beveled surface of the beveled inlet (3) is distributed opposite to the gas inlet (6).

4. A longitudinal flow hollow ring electric heater according to claim 1, characterized in that: A plurality of the hollow ring support assemblies (4) are provided, and the plurality of the hollow ring support assemblies (4) are arranged at equal intervals inside the electric heater cylinder (2).

5. A longitudinal flow hollow ring electric heater according to claim 4, characterized in that: The hollow ring support assembly (4) comprises a hollow ring (401) and a reinforcing rib (402); A plurality of the hollow rings (401) are provided, the plurality of the hollow rings (401) are evenly distributed in the cross-sectional direction of the electric heater cylinder (2), and the plurality of the hollow rings (401) are connected via the reinforcing ribs (402); The plurality of electric heating tubes (5) are arranged between the plurality of hollow rings (401) and the electric heater cylinder (2).

6. A longitudinal flow hollow ring electric heater according to claim 5, characterized in that: The hollow ring (401) is a short hollow steel pipe.

7. The longitudinal flow hollow ring electric heater according to claim 1, characterized in that: A gas outlet (7) is provided on the end of the electric heater cylinder (2) away from the oblique inlet (3).

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