A heating uniformity air duct type electric heater

Abstract

The utility model relates to a kind of air duct type electric heater of uniform heating, belong to air duct type electric heater technical field, including air inlet ventilation pipeline, heating pipeline, air outlet ventilation pipeline, electric heater main body, honeycomb rectifier, air mixing frame, helical static mixer, air inlet ventilation pipeline, heating pipeline, air outlet ventilation pipeline are sequentially communicated, and electric heater main body is connected with heating pipeline, and electric heater main body is provided with electric heating tube.The utility model can avoid that electric heating element is arranged in the center of air duct or one side, significantly improve temperature uniformity, ensure that the heat power input of unit area on the cross section of air duct is as uniform as possible, avoid overheating caused by excessive power in local area, and the heating tube arrangement design of front dense and rear sparse can reduce unnecessary overheating waste.

Description

Technical Field

[0001] This utility model relates to the field of duct-type electric heater technology, and in particular to a duct-type electric heater that provides uniform heating. Background Technology

[0002] A duct-type electric heater is an electric heating device specifically designed for installation in ventilation duct systems. Its core function is to convert electrical energy into heat energy and then deliver the heat to the area that needs to be heated through forced airflow driven by a fan.

[0003] A search revealed that Chinese Patent CN202321822403.5 discloses a duct-type electric heater with uniform heating. Multiple electric heating tubes are installed in a row inside the heater body through a connecting assembly, so that the airflow can be heated evenly during use, thereby improving heating efficiency. When in use, because multiple electric heating tubes are fixed in a row inside the heater body, the air entering from the air inlet passes through a row of electric heating tubes, so the incoming air can be heated evenly and quickly, thereby improving heating efficiency.

[0004] The above-mentioned technical solutions have the following drawbacks: traditional duct electric heaters often use a centralized heating tube layout, which easily leads to uneven heating of the air. There is a "cold front, hot back" gradient in the axial direction of the ventilation duct, with the temperature at the center of the cross-section being higher than that at the edge. Moreover, the turbulent airflow organization forms local high-temperature zones, causing overheating risks. To overcome the problem of uneven temperature distribution in traditional duct heaters, a duct-type electric heater with uniform heating is proposed. The duct-type electric heater is divided into a flow equalization section, a multi-stage heating section, and a mixing section. The flow equalization section can convert the turbulence in the air inlet duct into laminar flow and distribute the flow velocity evenly. The multi-stage heating section is equipped with uniformly staggered high-density finned heating tubes, which can transfer heat to the flowing air faster and more evenly. The mixing section can force the mixing of cold and hot air and eliminate temperature stratification.

[0005] In view of this, this work improves and solves the above problems. Through dedicated research and application of theoretical principles, a technical solution with a reasonable design that can effectively improve the above defects has finally been proposed.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] This invention provides a duct-type electric heater that provides uniform heating, solving the problems mentioned in the background. It avoids arranging the heating elements in the center or on one side of the duct, significantly improving temperature uniformity and ensuring that the heat power input per unit area on the duct cross-section is as uniform as possible, avoiding excessive power in local areas that could lead to overheating and reducing unnecessary overheating waste.

[0008] The present invention provides the following solution to the above-mentioned technical problems: A uniformly heated duct-type electric heater includes an inlet ventilation duct, a heating duct, an outlet ventilation duct, an electric heater body, a honeycomb rectifier, an air mixing frame, and a spiral static mixer. The inlet ventilation duct, the heating duct, and the outlet ventilation duct are connected in sequence. The electric heater body is connected to the heating duct. The electric heater body is provided with electric heating tubes, and five sets of electric heating tubes are provided. Heating fins are uniformly installed on the outer wall of the electric heating tubes. The arrangement density of the five sets of electric heating tubes decreases sequentially along the airflow direction. The heating duct is equipped with a positioning slot. The honeycomb rectifier and the air mixing frame are positioned through the positioning slot and connected to the heating duct by screws.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the arrangement density of the five groups of electric heating tubes along the airflow direction is arranged in the following order: dense spacing, medium spacing, low spacing, loose spacing, and dispersed spacing. The electric heating tubes with dense spacing are used to quickly increase the base temperature; the electric heating tubes with medium and low spacing are used to balance the axial temperature gradient; the electric heating tubes with loose spacing are used to compensate for the heat in the edge area; and the electric heating tubes with dispersed spacing are used to eliminate the cross-sectional temperature difference.

[0011] Furthermore, the heating pipe is divided into a flow equalization section, a multi-stage heating section, and a flow mixing section by positioning slots. The flow equalization section converts turbulence into laminar flow and distributes the flow velocity evenly. The multi-stage heating section eliminates flow dead zones through staggered electric heating tubes and heating fins.

[0012] Furthermore, the heating fins of adjacent electric heating tubes are arranged in an alternating manner, and the electric heating tubes and heating fins can form a finned electric heating tube to heat the air passing through.

[0013] Furthermore, the positioning slot is provided in two places, and the spiral static mixer is provided with multiple connections to the air mixing frame via screws. This connection structure facilitates disassembly and replacement.

[0014] Furthermore, temperature sensors are installed at both the inlet and outlet of the heating pipe, which can monitor the heating effect of the air.

[0015] Furthermore, the positioning slots on both sides are respectively provided with slots corresponding to the honeycomb rectifier and the air mixing frame, and the heating pipe is provided with mounting holes corresponding to the honeycomb rectifier and the air mixing frame, so that the honeycomb rectifier and the air mixing frame can be easily disassembled, installed, inspected and maintained on the heating pipe.

[0016] Furthermore, the inner wall of the positioning slot is fitted with a sealing gasket, and both the honeycomb rectifier and the air mixing frame are fixedly fitted with handles.

[0017] Furthermore, the spiral static mixer includes a stainless steel duct, spiral blades, end flanges, a support frame, and turbulent micro-protrusions. The support frame is installed on the inner wall of the stainless steel duct, and the spiral blades are rotatably connected to the support frame. The spiral blades continuously twist along the axial direction to force the airflow to rotate and mix. The stainless steel duct is provided with end flanges, and the turbulent micro-protrusions are welded to the spiral blades. In this way, the micro-protrusions on the surface enhance local turbulence.

[0018] Furthermore, the end flange is connected to the air mixing frame by screws, and the air mixing frame is provided with mounting holes corresponding to the stainless steel air duct.

[0019] This invention provides a duct-type electric heater that provides uniform heating, and has the following advantages:

[0020] 1. The honeycomb rectifier in the flow equalization section can convert turbulence into laminar flow and distribute the flow velocity evenly, transforming disordered turbulence into uniform laminar flow. This can effectively eliminate the temperature deviation caused by the inlet effect, allowing the air to contact the electric heating tube more evenly and improving heating efficiency.

[0021] 2. The electric heating tubes are divided into five groups, with decreasing density along the airflow direction. The densely spaced electric heating tubes are used to quickly increase the base temperature, the medium and low spacing electric heating tubes are used to balance the axial temperature gradient, the loosely spaced electric heating tubes are used to compensate for the heat in the edge area, and the dispersed spacing electric heating tubes are used to eliminate the cross-sectional temperature difference. The staggered arrangement of electric heating tubes and heating fins can effectively eliminate the flow dead zone.

[0022] 3. Uniformly heated air can be discharged to the air mixing rack, and the spiral static mixer can force the mixing of hot and cold air to eliminate temperature stratification;

[0023] 4. This type of duct-type electric heater avoids arranging the heating elements in the center or on one side of the duct, significantly improving temperature uniformity and ensuring that the heat power input per unit area on the duct cross-section is as uniform as possible, avoiding excessive power in local areas that could lead to overheating. In addition, the dense front and sparse back heating tube arrangement design can reduce unnecessary overheating waste.

[0024] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 A schematic diagram of the structure of a duct-type electric heater for uniform heating, provided in one embodiment of this utility model;

[0027] Figure 2 A front view of a duct-type electric heater for uniform heating, provided in an embodiment of the present invention;

[0028] Figure 3 A split view of a duct-type electric heater for uniform heating according to an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the arrangement of electric heating tubes in a duct-type electric heater for uniform heating, provided as an embodiment of this utility model;

[0030] Figure 5 A schematic diagram of the structure of a spiral static mixer in a duct-type electric heater for uniform heating, provided as an embodiment of this utility model;

[0031] Figure 6 A schematic diagram of the structure of a duct-type electric heater for uniform heating, provided in an embodiment of this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of a honeycomb rectifier in a duct-type electric heater that provides uniform heating, according to an embodiment of the present invention.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Inlet ventilation duct; 2. Heating duct; 3. Outlet ventilation duct; 4. Electric heater body; 5. Electric heating tube; 6. Heating fins; 7. Positioning slot; 8. Flow equalization section; 9. Multi-stage heating section; 10. Mixing section; 11. Honeycomb rectifier; 12. Air mixing frame; 13. Spiral static mixer; 1301. Stainless steel air duct; 1302. Spiral blades; 1303. End flange; 1304. Support frame; 1305. Turbulent micro-protrusion; 14. Temperature sensor; 15. Sealing gasket; 16. Handle. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-7 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0036] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] like Figure 1-2As shown, a duct-type electric heater for uniform heating includes an inlet ventilation duct 1, a heating duct 2, an outlet ventilation duct 3, an electric heater body 4, a honeycomb rectifier 11, an air mixing frame 12, and a spiral static mixer 13. The inlet ventilation duct 1, heating duct 2, and outlet ventilation duct 3 are connected sequentially. The electric heater body 4 is connected to the heating duct 2. The electric heater body 4 is equipped with electric heating tubes 5, and there are five sets of electric heating tubes 5. Heating fins 6 are evenly installed on the outer wall of the electric heating tubes 5. The arrangement density of the five sets of electric heating tubes 5 decreases sequentially along the airflow direction. The heating pipe 2 is equipped with positioning slots 7. The honeycomb rectifier 11 and the air mixing frame 12 are positioned through the positioning slots 7 and connected to the heating pipe 2 with screws. Temperature sensors 14 are installed at both the inlet and outlet of the heating pipe 2. The temperature sensors 14 can monitor the heating effect of the air. The positioning slots 7 on both sides are respectively provided with slots for the honeycomb rectifier 11 and the air mixing frame 12. The heating pipe 2 is provided with mounting holes for the honeycomb rectifier 11 and the air mixing frame 12, so that the honeycomb rectifier 11 and the air mixing frame 12 can be easily disassembled, installed, inspected and maintained on the heating pipe 2.

[0039] like Figure 4 As shown, the arrangement density of the five sets of electric heating tubes 5 along the airflow direction is arranged in the order of dense spacing, medium spacing, low spacing, loose spacing and dispersed spacing. The heating fins 6 of adjacent electric heating tubes 5 are staggered. The electric heating tubes 5 and heating fins 6 can form a finned electric heating tube to heat the passing air. The inner wall of the positioning slot 7 is equipped with a sealing gasket 15.

[0040] like Figure 6-7 As shown, both the honeycomb rectifier 11 and the air mixing frame 12 are fixedly installed with handles 16, and there are two positioning slots 7. The spiral static mixer 13 is provided with multiple screws connected to the air mixing frame 12. This connection structure facilitates disassembly and replacement.

[0041] like Figure 3 As shown, the heating pipe 2 is divided into a flow equalization section 8, a multi-stage heating section 9, and a mixing section 10 by positioning slots 7. The flow equalization section 8 converts turbulence into laminar flow and distributes the flow velocity evenly. The multi-stage heating section 9 eliminates the flow dead zone by staggered electric heating tubes 5 and heating fins 6.

[0042] like Figure 5As shown, the spiral static mixer 13 includes a stainless steel duct 1301, a spiral blade 1302, an end flange 1303, a support frame 1304, and a turbulent micro-protrusion 1305. The support frame 1304 is installed on the inner wall of the stainless steel duct 1301. The spiral blade 1302 is rotatably connected to the support frame 1304. The spiral blade 1302 continuously twists along the axial direction, forcing the airflow to rotate and mix. The stainless steel duct 1301 is provided with an end flange 1303. The turbulent micro-protrusion 1305 is welded to the spiral blade 1302. This micro-protrusion on the surface enhances local turbulence. The end flange 1303 is connected to the air mixing frame 12 by screws. The air mixing frame 12 is provided with mounting holes corresponding to the stainless steel duct 1301.

[0043] The specific working principle and usage method of this utility model are as follows: External air is introduced into the heating pipe 2 through the air intake ventilation pipe 1. The honeycomb rectifier 11 of the flow equalization section 8 can convert turbulence into laminar flow and distribute the flow velocity evenly, so that the air can be evenly discharged to the multi-stage heating section 9. The electric heating tubes 5 of the electric heater body 4 can evenly heat the air. The electric heating tubes 5 are divided into five groups with decreasing density along the airflow direction. The densely spaced electric heating tubes 5 are used to quickly increase the base temperature, the medium and low spacing electric heating tubes 5 are used to balance the axial temperature gradient, the loosely spaced electric heating tubes 5 are used to compensate for the heat in the edge area, and the dispersed spacing electric heating tubes 5 are used to eliminate the cross-sectional temperature difference. The electric heating tubes 5 and the heating fins 6 are arranged in an alternating manner to effectively eliminate the flow dead zone. The evenly heated air can be discharged to the air mixing rack 12. The spiral static mixer 13 can force the mixing of cold and hot air and eliminate temperature stratification.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A uniformly heated duct-type electric heater, comprising an inlet ventilation duct (1), a heating duct (2), an outlet ventilation duct (3), an electric heater body (4), a honeycomb rectifier (11), an air mixing frame (12), and a spiral static mixer (13), characterized in that: The air intake ventilation duct (1), heating duct (2), and air outlet ventilation duct (3) are connected in sequence. The electric heater body (4) is connected to the heating duct (2). The electric heater body (4) is provided with electric heating tubes (5). There are five sets of electric heating tubes (5). Heating fins (6) are evenly installed on the outer wall of the electric heating tubes (5). The arrangement density of the five sets of electric heating tubes (5) decreases sequentially along the airflow direction. The heating duct (2) is equipped with a positioning slot (7). The honeycomb rectifier (11) and air mixing rack (12) are positioned through the positioning slot (7) and connected to the heating duct (2) with screws.

2. The duct-type electric heater with uniform heating according to claim 1, characterized in that, The arrangement density of the five groups of electric heating tubes (5) along the airflow direction is arranged in the following order: dense spacing, medium spacing, low spacing, loose spacing, and dispersed spacing.

3. The uniformly heated duct-type electric heater according to claim 1, characterized in that, The heating pipe (2) is divided into a flow equalization section (8), a multi-stage heating section (9), and a flow mixing section (10) by a positioning slot (7).

4. The duct-type electric heater with uniform heating according to claim 1, characterized in that, The heating fins (6) of adjacent electric heating tubes (5) are arranged alternately.

5. The uniformly heated duct-type electric heater according to claim 1, characterized in that, Two positioning slots (7) are provided, and multiple spiral static mixers (13) are provided and connected to the air mixing frame (12) by screws.

6. The uniformly heated duct-type electric heater according to claim 1, characterized in that, Temperature sensors (14) are installed at both the inlet and outlet of the heating pipe (2).

7. The duct-type electric heater with uniform heating according to claim 1, characterized in that, The positioning slots (7) on both sides are respectively provided with slots for the honeycomb rectifier (11) and the air mixing rack (12), and the heating pipe (2) is provided with mounting holes for the honeycomb rectifier (11) and the air mixing rack (12).

8. The uniformly heated duct-type electric heater according to claim 1, characterized in that, The inner wall of the positioning slot (7) is fitted with a sealing gasket (15), and the honeycomb rectifier (11) and the air mixing rack (12) are both fixedly fitted with handles (16).

9. The uniformly heated duct-type electric heater according to claim 1, characterized in that, The spiral static mixer (13) includes a stainless steel duct (1301), a spiral blade (1302), an end flange (1303), a support frame (1304), and a turbulent micro-protrusion (1305). The support frame (1304) is installed on the inner wall of the stainless steel duct (1301). The spiral blade (1302) is rotatably connected to the support frame (1304). The spiral blade (1302) rotates continuously along the axial direction to force the airflow to rotate and mix. The stainless steel duct (1301) is provided with an end flange (1303). The turbulent micro-protrusion (1305) is welded to the surface of the spiral blade (1302).

10. A duct-type electric heater for uniform heating according to claim 9, characterized in that, The end flange (1303) is connected to the air mixing frame (12) by screws, and the air mixing frame (12) is provided with mounting holes corresponding to the stainless steel air duct (1301).

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