Electric heating element of air duct type heater

Abstract

The utility model provides an electric heating element of an air duct type heater, and relates to the technical field of air duct heating. An air duct guide assembly; the air duct guiding assembly comprises an air guiding threaded block fixedly connected in the shell, one end of the air guiding threaded block is fixedly connected with an air inducing block, a fixing hole is formed in the air inducing block, the fixing hole is fixedly connected with a heating resistance wire, and the end, close to the air guiding threaded block, of the heating resistance wire is fixedly connected with a heat conduction head; an air supply assembly is fixedly connected into the shell. By means of the design, airflow is evenly guided and accelerated in a heating area, the air flowing resistance is reduced, the problem that vortex is generated or local flow speed is too high due to the staggered and obliquely-arranged flow guide plates is solved, heat exchange between the airflow and the heating surface is effectively improved through the structure of the air guide threaded blocks and the airflow disturbance design, and the heating effect is improved. And the heat conduction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of air duct heating technology, and in particular to an electric heating element for an air duct heater. Background Technology

[0002] The heating element of a duct heater is usually a resistance wire or resistance strip made of high-quality alloy material. When current passes through the resistance wire, electrical energy is converted into heat energy. The heat is efficiently transferred to the air flowing in the duct through the metal sheath, thereby achieving rapid heating of the air.

[0003] To address the issues of airflow passing quickly through the heating element in duct-type hot air heaters, which reduces the heater's thermal efficiency and causes damage to the heating element due to air impact, some existing technologies use staggered, obliquely arranged guide plates to make the airflow through the heating element flow in an S-shape, thereby reducing the impact on the heating element.

[0004] However, in actual use, the staggered and oblique arrangement of the guide vanes may cause poor airflow, resulting in eddies or excessively high local flow velocities, which will affect heating efficiency and air uniformity. In addition, the staggered and oblique arrangement of the guide vanes may also increase airflow resistance, leading to increased energy consumption.

[0005] Therefore, this utility model provides an electric heating element for a duct-type heater. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a heating element for a duct-type heater.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a duct-type heater electric heating element, comprising;

[0008] shell;

[0009] Air duct guiding assembly; the air duct guiding assembly includes an air guide threaded block fixedly connected inside the housing, one end of the air guide threaded block being fixedly connected to an air guide block, and the air guide block having an opening inside.

[0010] A fixing hole is provided, on which a heating resistance wire is fixedly connected. A heat-conducting head is fixedly connected to one end of the heating resistance wire near the air guide threaded block.

[0011] An air supply assembly is fixedly connected inside the outer casing.

[0012] In a preferred embodiment, the air supply assembly includes a conical column fixedly connected inside the housing, with a fan mounted at one end of the conical column.

[0013] In a preferred embodiment, the outer casing has an air inlet at one end near the air guide thread block, and an air outlet at the other end away from the air inlet.

[0014] In a preferred embodiment, the end of the conical column furthest from the fan is fixedly connected to a mounting bracket.

[0015] The outer side of the mounting column is fixedly connected to the heating resistance wire, and the end of the mounting column away from the conical column is fixedly connected to the inner wall of the outer shell.

[0016] In a preferred embodiment, a mounting base is fixedly connected to the bottom outer side of the housing.

[0017] In a preferred embodiment, the diameter of the air guide threaded block is larger than the diameter of the air intake block, and an axially through air duct is formed inside the air intake block.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0019] This invention utilizes the operation of a fan to generate airflow, which draws in outside air through the air inlet. Guided by a conical column, the airflow is accelerated and concentrated, ensuring a stable entry into the heating zone. As the airflow passes through the guide screw block, the screw design disturbs the airflow boundary layer, increasing heat exchange between the airflow and the surface of the guide screw block. Since the diameter of the guide screw block is larger than that of the air intake block, the airflow gradually converges after passing through the guide screw block and continues to flow through the axial ventilation channel of the air intake block. The air is effectively heated as it passes through the heating resistance wire and is finally discharged through the air outlet. This design ensures uniform guidance and acceleration of the airflow within the heating zone, reducing airflow resistance and avoiding problems such as vortices or excessively high local flow velocities caused by the staggered, obliquely arranged guide plates. Furthermore, the structure of the guide screw block and the airflow disturbance design effectively increase heat exchange between the airflow and the heating surface, improving heat conduction efficiency. Attached Figure Description

[0020] Figure 1 is a perspective view of an electric heating element of a duct-type heater provided by this utility model;

[0021] Figure 2 is a schematic diagram of the internal structure of the heating element of a duct-type heater provided by this utility model;

[0022] Figure 3 is a schematic diagram of the air supply assembly structure of the electric heating element of the duct type heater provided by this utility model;

[0023] Figure 4 is a schematic diagram of the air duct guide assembly structure of an electric heating element of an air duct type heater provided by this utility model;

[0024] Figure 5 is a schematic diagram of the airflow of the heating element of the air duct type heater provided by this utility model.

[0025] Legend:

[0026] 1. Outer shell;

[0027] 2. Air duct guiding assembly; 21. Air guide threaded block; 22. Air intake block; 23. Fixing hole; 24. Heating resistance wire; 25. Heat conduction head;

[0028] 3. Air supply assembly; 31. Fan; 32. Conical column; 33. Air inlet; 34. Air outlet; 35. Mounting column;

[0029] 4. Fixture. Detailed Implementation

[0030] 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.

[0031] As shown in Figure 1, this embodiment provides a technical solution: a duct-type heater heating element, comprising;

[0032] The outer casing 1 has a fixed base 4 fixedly connected to its outer bottom end;

[0033] The outer casing 1 is the main external structure of the entire duct-type heater's heating element, playing a crucial role in protecting the internal components and providing positioning and support for the entire device. It houses the internal components such as the duct guide assembly 2.

[0034] The structure is housed within the internal space to prevent external environmental factors from interfering with the internal structure and working state of the heating element. The mounting base 4 can stably install the entire heating element in the corresponding working position to ensure its stability during use.

[0035] As shown in Figure 1- Figure 5 As shown, the air duct guiding assembly 2 includes an air guide threaded block 21 fixedly connected inside the housing 1, and an air guide block 22 fixedly connected to one end of the air guide threaded block 21.

[0036] The diameter of the air guide threaded block 21 is larger than the diameter of the air duct block 22. An axially through air duct is formed inside the air duct block 22. A fixing hole 23 is opened inside the air duct block 22. A heating resistance wire 24 is fixedly connected to the fixing hole 23. A heat conduction head 25 is fixedly connected to one end of the heating resistance wire 24 near the air guide threaded block 21.

[0037] The air guide threaded block 21 is fixedly connected inside the outer casing 1, and its diameter is larger than that of the air guide block 22.

[0038] This size design helps to create a specific airflow structure, which plays an initial guiding role in airflow.

[0039] Furthermore, the design of the conical column 32 allows for a smoother flow of air into the subsequent duct structure. Simultaneously, the threaded design on the guide screw block 21 increases the contact area between the airflow and the surface of the guide screw block 21, facilitating heat transfer and distribution. This allows the airflow to initially absorb some heat as it passes through the guide screw block 21. The air intake block 22 is fixedly connected to one end of the guide screw block 21, forming an axially continuous airflow channel. This channel is the main flow path for the airflow, allowing it to flow from one end of the air intake block 22 to the other, thus achieving directional airflow. When air flows over the threaded surface of the guide screw block 21, the thread shape causes airflow disturbance, helping to disrupt the airflow boundary layer and allowing for more thorough heat exchange between the airflow and the surface of the guide screw block 21. By increasing the turbulence of the airflow, the heat transfer coefficient can be improved, thereby increasing the heating efficiency of the air. Secondly, the threaded design increases the heat exchange area, meaning more heat can be transferred to the air, further improving heating efficiency. The diameter of the air intake block 22 is smaller than that of the guide screw block 21. The diameter of the airflow is such that the airflow gradually converges after passing through the guide screw block 21, increasing the airflow speed, enhancing the airflow's fluidity and heat removal capacity, thus improving heating efficiency. The fixing hole 23 is located inside the air guide block 22, and its main function is to fix and connect the heating resistance wire 24. Through the fixing hole 23, the heating resistance wire 24 can be stably installed in a suitable position inside the air guide block 22, ensuring that the heating resistance wire 24 will not shift or loosen during operation.

[0040] The heating element is fixed to the fixing hole 23 to ensure the stability and uniformity of heating. The position and size of the fixing hole 23 should match the shape and size of the heating resistance wire 24 to facilitate its installation and fixation. This also ensures a suitable distance between the heating resistance wire 24 and the air duct inside the air intake block 22, allowing the airflow to fully contact the heating resistance wire 24 for heat exchange. The heating resistance wire 24, fixedly connected to the fixing hole 23, is the core heating component of the duct-type heater. When current passes through the heating resistance wire 24, electrical energy is converted into heat energy due to the resistance of the wire, causing the heating resistance wire 24 to heat up. A heat-conducting head 25 is fixedly connected to one end near the air intake thread block 21. The heat-conducting head 25 quickly transfers the heat generated by the heating resistance wire 24 to the air intake thread block 21, and then to the airflow passing through the duct, thus heating the air. The heat-conducting head 25 rapidly conducts the heat generated by the heating resistance wire 24 to the air intake block 22. It is usually made of materials with good thermal conductivity, such as copper and aluminum, which can quickly absorb the heat of the heating resistance wire 24 and evenly transfer it to the air guide thread block 21, so that the temperature of the air guide thread block 21 rises rapidly, thereby accelerating the heat transfer speed to the airflow and improving the heating efficiency.

[0041] As shown in Figure 1- Figure 3 As shown, an air supply assembly 3 is fixedly connected inside the outer casing 1. The air supply assembly 3 includes a conical column 32 fixedly connected inside the outer casing 1. A fan 31 is installed at one end of the conical column 32. An air inlet 33 is opened at one end of the outer casing 1 near the air guide thread block 21, and an air outlet 34 is opened at one end of the outer casing 1 away from the air inlet 33. A mounting column 35 is fixedly connected at one end of the conical column 32 away from the fan 31. The outer side of the mounting column 35 is fixedly connected to the heating resistance wire 24, and the end of the mounting column 35 away from the conical column 32 is fixedly connected to the inner wall of the outer casing 1.

[0042] The conical column 32 is conical in shape. This design helps guide airflow to the inner wall of the housing 1. The fan 31 is installed at one end of the conical column 32 and is the power source for the air supply assembly 3. Its main function is to generate airflow, drawing outside air into the housing 1 through the air inlet 33, and guiding the airflow to the vicinity of the heating resistance wire 24 under the guidance of the conical column 32. The air inlet 33 is the entrance for air to enter the heating element of the duct-type heater, while the air outlet 34 is located at the end of the housing 1 away from the air inlet 33 and is the outlet for the heated air to exit. The air heated by the heating resistance wire 24 is then fanned by the fan 31.

[0043] Under the action of air outlet 34, the heating resistance wire 24 is discharged and delivered to the area or equipment that needs to be heated. The function of the mounting column 35 is to fix and support the heating resistance wire 24, so that the heating resistance wire 24 can be stably installed in the predetermined position during operation and will not be displaced or loosened due to the impact of airflow or other external forces.

[0044] Working principle:

[0045] As shown in Figures 1-5:

[0046] In use: First, the fan 31 starts running after being powered on, generating airflow. Outside air is drawn into the housing 1 through the air inlet 33. Then, guided by the conical column 32, the airflow is directed towards the vicinity of the heating resistance wire 24. Due to the conical design of the column 32, the airflow gradually accelerates and concentrates, allowing it to enter the heating area more smoothly. At this time, the mounting column 35 fixes and supports the heating resistance wire 24, ensuring its stable installation inside the housing 1 and preventing displacement or loosening due to airflow impact. When the airflow passes through the guide thread block 21, the thread design causes turbulence, disrupting the airflow boundary layer and increasing heat exchange between the airflow and the surface of the guide thread block 21. The diameter of the guide thread block 21 is larger than that of the air intake block 22, causing the airflow to gradually converge after passing through it. The airflow continues through the axial ventilation channel inside the air intake block 22. The thread design of the air intake block 22 also increases airflow turbulence. The heating resistance wire 24 generates heat when current passes through it, and the heat conduction head 25... Heat is quickly transferred to the air guide thread block 21, and then to the airflow to heat the air. Finally, the heated air is discharged from the air outlet 34 and delivered to the area or equipment that needs to be heated.

[0047] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A heating element for a duct-type heater, characterized in that, include; Outer shell (1); Air duct guiding assembly (2); the air duct guiding assembly (2) includes an air guide threaded block (21) fixedly connected inside the outer shell (1), an air guide block (22) fixedly connected to one end of the air guide threaded block (21), a fixing hole (23) is provided inside the air guide block (22), a heating resistance wire (24) is fixedly connected to the fixing hole (23), and a heat conduction head (25) is fixedly connected to one end of the heating resistance wire (24) near the air guide threaded block (21); An air supply assembly (3) is fixedly connected inside the outer casing (1).

2. The heating element of a duct-type heater according to claim 1, characterized in that: The air supply assembly (3) includes a conical column (32) fixedly connected inside the housing (1), and a fan (31) is installed at one end of the conical column (32).

3. The heating element of a duct-type heater according to claim 2, characterized in that: An air inlet (33) is provided at one end of the outer casing (1) near the air guide thread block (21), and an air outlet (34) is provided at the other end of the outer casing (1) away from the air inlet (33).

4. The heating element of a duct-type heater according to claim 2, characterized in that: The tapered column (32) is fixedly connected to a mounting column (35) at the end away from the fan (31). The outer side of the mounting column (35) is fixedly connected to the heating resistance wire (24), and the end of the mounting column (35) away from the tapered column (32) is fixedly connected to the inner wall of the outer shell (1).

5. The heating element of a duct-type heater according to claim 1, characterized in that: A fixing seat (4) is fixedly connected to the bottom outer side of the outer shell (1).

6. The heating element of a duct-type heater according to claim 1, characterized in that: The diameter of the air guide threaded block (21) is larger than the diameter of the air duct block (22), and an axially penetrating air duct is formed inside the air duct block (22).

Images