Convection radiation electric heater

Abstract

The utility model belongs to the technical field of heating equipment, and particularly relates to a convection radiation electric heater. The heating module and the reflecting plate are arranged in the heating cavity front and back, the heating module is used for generating heat after being electrified, and the reflecting plate is used for reflecting the heat of the heating module into the heating cavity; heat dissipation grid holes are formed in the front surface of the heating cavity and are used for radiation heat dissipation; the upper portion and the lower portion of the heating cavity are provided with convection air exhaust grille holes and convection air inlet grille holes respectively, and the convection air exhaust grille holes and the convection air inlet grille holes are used for convection heat dissipation of hot air in the heating cavity. The utility model has the functions of convective heat and radiant heat, and has the advantages of wide application range, high heat efficiency, no noise and excellent biological environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of heating equipment, and specifically relates to a convective radiant electric heater. Background Technology

[0002] Electric heating equipment comes in many forms, including direct heating types using heating tubes or heating wires, and types that use a heat exchange medium, such as hot air, hot water, hot oil, or chemically synthesized media. Each type has its own characteristics depending on its application and context. For heat exchange systems that release heat through a medium, achieving optimal thermal efficiency is difficult. This is because the energy conversion between any two substances can never be 100%, directly impacting thermal efficiency. Therefore, under the constraints of technological limitations, direct-heating electric heaters offer the highest thermal efficiency.

[0003] Traditional direct-heating electric heaters, whether using heat pipes or heating wires, essentially dissipate heat directly to the heated object or environment. However, the timely dissipation of heat by the heating element requires certain external conditions. The rationality of these external structural conditions directly affects heat dissipation efficiency, heat source utilization, and even safe operation. Previous products had several shortcomings in improving heat dissipation capacity. Firstly, the heat pipe support structure did not consider the heat pipe temperature; at a given power density, a suitable spatial structure is needed to generate convection for timely heat dissipation. Secondly, the directionality of heat dissipation in many situations was not taken into account, preventing the product from operating at its optimal state. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a convection-radiation electric heater to solve the problem of low heat dissipation efficiency in existing direct-heating electric heaters.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a convective radiant heater, including a heating cavity and a heating module and a reflector plate disposed at the front and rear of the heating cavity. The heating module generates heat after being powered on, and the reflector plate reflects the heat from the heating module into the heating cavity. The front of the heating cavity is provided with heat dissipation grille holes for radiative heat dissipation. The upper and lower parts of the heating cavity are respectively provided with convective exhaust grille holes and convective inlet grille holes for convective heat dissipation of hot air inside the heating cavity.

[0007] The heating cavity is a flat, upright structure formed by fastening the panel and the housing. The reflector is connected to the housing, and a gap is left between the reflector and the housing for airflow.

[0008] The upper end of the heating cavity is a contraction structure that accelerates the hot airflow.

[0009] The panel includes a facade, a top surface, and a transition slope connecting the facade and the top surface.

[0010] The convection exhaust grille includes a front convection exhaust grille and a top convection exhaust grille, wherein the front convection exhaust grille is disposed on the transition slope of the panel, and the top convection exhaust grille is disposed on the top surface of the panel.

[0011] The convection air intake grille includes a front convection air intake grille, a bottom convection air intake grille, and a rear convection air intake grille. The front convection air intake grille and the rear convection air intake grille are respectively located on the lower part of the panel and the housing, and the bottom convection air intake grille is located on the bottom of the housing.

[0012] The heating module includes at least one heating element, which is mounted on a heating element bracket by a heating element fixing clamp. The heating element bracket spans the outside of the reflector and is connected to the housing, with a gap between the heating element and the reflector.

[0013] The heating element is a U-shaped finned heating element, and the heating element is arranged laterally in the heating cavity.

[0014] The panel is equipped with a temperature control knob for controlling the temperature of the heating module.

[0015] The reflector is a high-gloss mirror with a saddle-shaped structure.

[0016] The advantages and positive effects of this utility model are as follows: The convection radiant electric heater provided by this utility model adopts a flat structure, which is simple in structure, has high heating efficiency, and makes full use of heat. It not only improves heat dissipation performance and increases the safety of the electric heater, but also reduces material costs and weight. Attached Figure Description

[0017] Figure 1 This is a front view of the convective radiant electric heater of this utility model;

[0018] Figure 2 for Figure 1 AA section view;

[0019] Figure 3 for Figure 1 of Figure 1 Top view;

[0020] Figure 4 for Figure 1 Rear view;

[0021] Figure 5This is an isometric view of the present invention after the panel has been removed.

[0022] In the diagram: 1-panel, 101-facade, 102-transition slope, 103-top surface, 2-front convection exhaust grille hole, 3-front convection air inlet grille hole, 4-temperature control knob, 5-housing, 6-power cord, 7-plug-in mounting plate, 8-top convection exhaust grille hole, 9-bottom convection air inlet grille hole, 10-rear convection air inlet grille hole, 11-heating tube bracket, 12-heating tube, 13-heating tube fixing clamp, 14-reflector, 16-heat dissipation grille hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] See Figures 1 to 5 As shown, this utility model provides a convective radiant heater, including a heating cavity and a heating module and a reflector 14 disposed at the front and rear of the heating cavity. The heating module is used to generate heat after being powered on, and the reflector 14 is used to reflect the heat of the heating module into the heating cavity. The front of the heating cavity is provided with a heat dissipation grille hole 16, which is used for radiative heat dissipation. The upper and lower parts of the heating cavity are respectively provided with a convective exhaust grille hole and a convective inlet grille hole, which are used for convective heat dissipation of hot air in the heating cavity.

[0025] See Figure 1 and Figure 2 As shown in the embodiment of this utility model, the heating cavity is a vertically flat structure formed by fastening the panel 1 and the housing 5 together. The reflector 14 is connected to the housing 5, and a gap is left between the reflector 14 and the housing 5 for airflow. The panel 1 is provided with a temperature control knob 4 for controlling the temperature of the heating module. When different temperature controllers are selected, the adjustable temperature range is 80% of the temperature range of the electric heater, or it can be adjusted in the full range. The side wall of the housing 5 is provided with a power cord 6 connected to the heating module, and the outer side of the housing 5 is provided with a plug-in mounting plate 7 for connecting to external fixed objects.

[0026] In this embodiment of the invention, the reflector 14 is a high-gloss mirror with a saddle-shaped structure. Specifically, the reflector 14 is made of stainless steel.

[0027] Furthermore, the upper part of the heating cavity is a contracting structure that accelerates the hot airflow. In this embodiment, the upper part of the heater is a trapezoidal structure, which converges at the top, forming a shape that is wider at the bottom and narrower at the top. This shape allows some of the rising hot airflow to overflow from the heating cavity in advance, increasing the convection of the hot airflow. On the other hand, the internal space of the heating cavity gradually narrows, which increases the flow speed of the rising hot airflow and enhances thermal convection.

[0028] See Figure 2 As shown in the embodiment of this utility model, the panel 1 includes a facade 101, a top surface 103, and a transition slope 102 connecting the facade 101 and the top surface 103.

[0029] See Figures 1 to 3 As shown in the embodiment of this utility model, the convection exhaust grille holes include a front convection exhaust grille hole 2 and a top convection exhaust grille hole 8. The front convection exhaust grille hole 2 is disposed on the transition slope 102 of the panel 1, and the top convection exhaust grille hole 8 is disposed on the top surface 103 of the panel 1. Preferably, the front convection exhaust grille hole 2 and the heat dissipation grille hole 16 are evenly spaced vertical elongated holes to enhance the convection and radiation heat dissipation effects.

[0030] Furthermore, the top convection exhaust grille hole 8 includes a set of evenly spaced transverse elongated holes and a set of evenly spaced longitudinal elongated holes. The transverse elongated holes are arranged close to the housing 5, and the longitudinal elongated holes are arranged close to the panel 1.

[0031] See Figure 1 , Figure 4 and Figure 3 As shown in the embodiment of this utility model, the convection air inlet grille includes a front convection air inlet grille 3, a bottom convection air inlet grille 9, and a rear convection air inlet grille 10. The front convection air inlet grille 3 and the rear convection air inlet grille 10 are respectively opened on the lower part of the panel 1 and the housing 5, and the bottom convection air inlet grille 9 is disposed on the bottom of the housing 5.

[0032] Preferably, the front convection air intake grille hole 3 and the rear convection air intake grille hole 10 are both vertically elongated holes that are evenly spaced, and the area of ​​the rear convection air intake grille hole 10 only occupies about one-eighth of the rear back plate of the housing 5; the bottom convection air intake grille hole 9 is a horizontally elongated hole that is evenly spaced to enhance convection heat dissipation.

[0033] See Figure 5 As shown in the embodiment of this utility model, the heating module includes at least one electric heating tube 12. The electric heating tube 12 is mounted on multiple spaced electric heating tube supports 11 by electric heating tube fixing clamps 13. Each electric heating tube support 11 spans the outside of the reflector plate 14 and its two ends are connected to the housing 5. A gap is left between the electric heating tube 12 and the reflector plate 14.

[0034] Preferably, the heating element 12 is a U-shaped finned heating element, and the heating element 12 is arranged laterally in the heating chamber. In this embodiment, there are two sets of heating elements 12, and the two sets of heating elements 12 are connected in parallel. The heating element support 11 has a W-shaped structure, which supports the heating element 12 so that the heating element 12 does not contact the reflector 14. The heating element fixing clamp 13 also has a W-shaped structure, which fixes the two sides of the U-shaped finned heating element to the heating element support 11.

[0035] This utility model provides a convective radiant heater, the working principle of which is as follows:

[0036] When the heating element 12 is powered on, current flows through the heating wire inside the heating element 12. The current is hindered by the resistance of the conductor to generate current heat. The heat diffuses to the tube wall of the heating element 12 and is dissipated to the surrounding area through the fins set on the outside of the tube wall. After reaching a certain temperature, the heat generation and heat dissipation tend to reach a certain temperature equilibrium, and the heating element 12 operates smoothly.

[0037] The heat generated by the electric heating element 12 diffuses to the outside in both convection and radiation modes.

[0038] Convective diffusion heat: When the heat generated by the heating element 12 heats the surrounding air through the fins, the increased air temperature creates an upward buoyancy force. Driven by this buoyancy, the airflow moves upward and overflows through the convection exhaust grille holes at the top of the heating chamber. The heated airflow diffuses and conducts heat around the heated body. Hot air continuously overflows through the convection exhaust grille holes at the top of the heating chamber, while low-temperature air is continuously replenished through the convection inlet grille holes at the bottom of the heating chamber. This airflow, with its temperature decreasing at the bottom and increasing at the top, forms a continuous cycle. This circulating airflow raises the temperature within a certain space, achieving the purpose of heating.

[0039] Radiative heat diffusion: A saddle-shaped reflector 14 is installed between the back plate of the housing 5 and the heating element 12. The side of the reflector 14 facing the heating element 12 has a high-gloss mirror surface. The reflector 14 has three functions: First, the mirror surface of the reflector 14 can reflect heat radiation away, preventing the heat generated by the heating element 12 from heating the back plate of the housing 5, which could cause a safety hazard due to the high temperature of the housing 5. Second, the close proximity of the reflector 14 to the heating element 12 creates a wall-mounted structure between the heating element 12 and the reflector 14, accelerating the upward flow of hot air. This principle originates from Bernoulli's principle of "the wall-attachment effect of a jet".

[0040] Meanwhile, because the reflector 14 has a saddle-shaped structure, a spatial channel is formed between the reflector 14 and the back plate of the housing 5. While isolating the back plate of the housing 5 from heat, the existence of the spatial channel enhances the airflow and strengthens the heat circulation function.

[0041] In this embodiment of the invention, front convection air inlet grille 3, heat dissipation grille 16, front convection exhaust grille 2, and top convection exhaust grille 8 are provided on the panel 1. The opening area of ​​the panel 1 is close to 50%. This structural feature ensures a specific form that enhances convection and radiation heat dissipation, allowing the radiant heat generated by the heating element 12 to radiate directly to the front surface from the openings on the panel 1. The heat radiated by the heating element 12 towards the back plate of the housing 5 is reflected by the reflector 14 towards the panel 1, causing the heat on the front surface of the heater to be concentrated onto the heated body. The lower part of the back plate of the housing 5 has a vertically opening rear convection air inlet grille 10. This structure makes the housing 5 and the panel 1 form a confined three-dimensional shape, with a "chimney"-like function, which enhances the flow of hot air. The upper part of the heater has a converging trapezoidal structure, which is beneficial for the escape of hot gas and the accelerated flow of hot air inside the housing, greatly improving the heat dissipation efficiency of the heater. The saddle-shaped reflector 14 can reflect the heat radiated by the heating tube 12 towards the back plate of the housing and reflect it forward, so that the heat can be fully utilized. At the same time, it protects the back plate of the housing 5 from high temperature baking and increases the safety of the heater.

[0042] This utility model provides a convection-radiation electric heater with a flat structure, simple design, and high heating efficiency. It improves heat dissipation performance while reducing material costs and weight. This utility model is suitable for many applications requiring heating, insulation, and temperature control, including offices, production sites, equipment maintenance, and home heating. It is also suitable for food-grade products undergoing dehydration and drying, as well as other baking applications. This utility model has a wide range of applications, high thermal efficiency, and combines the functions of convection and radiation heating. Because the heat source is electrically generated, it is completely environmentally friendly. Furthermore, its superior feature in environments with human activity and habitation is its quiet operation, eliminating any noise and creating an excellent biological environment.

[0043] The above description is merely an embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A convective-radiative electric heater, characterized in that, It includes a heating chamber and heating modules and a reflector (14) arranged in front and behind the heating chamber. The heating modules are used to generate heat after being powered on, and the reflector (14) is used to reflect the heat of the heating modules into the heating chamber. The front of the heating chamber is provided with heat dissipation grille holes (16), which are used for radiative heat dissipation. The upper and lower parts of the heating chamber are respectively provided with convection exhaust grille holes and convection inlet grille holes, which are used for convection heat dissipation of hot air in the heating chamber.

2. The convective radiant heater according to claim 1, characterized in that, The heating cavity is a flat, upright structure formed by fastening the panel (1) and the housing (5). The reflector (14) is connected to the housing (5), and a gap is left between the reflector (14) and the housing (5) for airflow.

3. The convective radiant heater according to claim 2, characterized in that, The upper end of the heating cavity is a contraction structure that accelerates the hot airflow.

4. The convective radiant heater according to claim 3, characterized in that, The panel (1) includes a facade (101), a top surface (103), and a transition slope (102) connecting the facade (101) and the top surface (103).

5. The convective radiant heater according to claim 4, characterized in that, The convection exhaust grille includes a front convection exhaust grille (2) and a top convection exhaust grille (8), wherein the front convection exhaust grille (2) is disposed on the transition slope (102) of the panel (1), and the top convection exhaust grille (8) is disposed on the top surface (103) of the panel (1).

6. The convective radiant heater according to claim 2, characterized in that, The convection air intake grille includes a front convection air intake grille (3), a bottom convection air intake grille (9), and a rear convection air intake grille (10). The front convection air intake grille (3) and the rear convection air intake grille (10) are respectively opened on the lower part of the panel (1) and the housing (5), and the bottom convection air intake grille (9) is located at the bottom of the housing (5).

7. The convective radiant heater according to claim 2, characterized in that, The heating module includes at least one heating element (12), which is mounted on a heating element bracket (11) by a heating element fixing clamp (13). The heating element bracket (11) spans the outside of the reflector (14) and is connected to the housing (5). There is a gap between the heating element (12) and the reflector (14).

8. The convective radiant heater according to claim 7, characterized in that, The heating element (12) is a U-shaped finned heating element, and the heating element (12) is arranged laterally in the heating cavity.

9. The convective radiant heater according to claim 2, characterized in that, The panel (1) is provided with a temperature control knob (4) for controlling the temperature of the heating module.

10. The convective radiant heater according to claim 1, characterized in that, The reflector (14) is a high-gloss mirror with a saddle-shaped structure.

Images