High-power-density K-type heating element

Abstract

The invention provides a high-power-density K-type heating element which comprises a flat plate heating element, an upper folded plate is arranged on the upper portion of a non-radiating surface of the flat plate heating element, upper folded plate windowing fins are arranged on the upper folded plate, a lower folded plate is arranged on the lower portion of the non-radiating surface of the flat plate heating element, and lower folded plate windowing fins are arranged on the lower folded plate. On the basis of a flat plate heating element, a certain number of windowing fins are additionally arranged on non-radiating surfaces of an upper flat plate and a lower flat plate, heat convection of the non-radiating surfaces of the heating element is increased, and more heat quickly enters a room through heat convection without affecting the radiating effect. And meanwhile, the surface temperature of a heating element is reduced, so that the thickness of the flat plate is reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of household heaters, in particular to a K-type heating element with high power density. Background Art

[0002] In the field of household heaters, different types of heaters use different heating elements. Most radiant heaters use black-sprayed flat heating elements. The structure is that the heating tube is connected to a heating fin plate with a corrugated surface above and below. The surface of the plate is sprayed black to enhance radiation heat exchange. However, the above heating element has the following problems:

[0003] 1. The power density of the heating element in the existing radiant heater is relatively low, that is, a larger heating element is required under the same power, which is costly and the size of the whole machine is larger;

[0004] 2. The heating element in the existing radiant heater exchanges heat by radiation, conduction and convection, but the effect of convection is not ideal. Therefore, according to the temperature rise requirements of the whole machine, its inherent structure cannot improve its power density;

[0005] 3. The existing flat heating element has poor heat exchange effect and high body temperature, so it is necessary to thicken the plate and increase the material to prevent the plate from bending during use, which will affect its service life and the temperature rise of the whole machine.

[0006] Therefore, there is an urgent need for a high power density K-type heating element that can solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a K-type heating element with high power density, which solves the problems raised in the background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a high-power-density K-type heating element, comprising a flat heating element, wherein an upper folding plate is provided on the upper portion of a non-radiating surface of the flat heating element, an upper folding plate is provided on the upper folding plate, and an upper folding plate window fin is provided on the upper folding plate; a lower folding plate is provided on the lower portion of the non-radiating surface of the flat heating element, and a lower folding plate window fin is provided on the lower folding plate.

[0010] Preferably, the flat heating element includes a heating tube, the upper part of the heating tube is connected to an upper flat plate, the upper folding plate is obliquely arranged on the non-radiating surface of the upper flat plate, the lower part of the heating tube is connected to a lower flat plate, and the lower folding plate is obliquely arranged on the non-radiating surface of the lower flat plate.

[0011] Preferably, the upper plate and the lower plate are both heating fin plates with corrugated surfaces, and the surfaces are sprayed black.

[0012] Preferably, a maximum distance L1 between the upper folding plate and the upper flat plate and a maximum distance L2 between the lower folding plate and the lower flat plate are both less than or equal to 15 mm.

[0013] Preferably, the included angle θ1 between the upper folding plate and the upper flat plate and the included angle θ2 between the lower folding plate and the lower flat plate are both less than or equal to 20°.

[0014] Preferably, the height H4 of the upper folding plate is less than or equal to H1 / cosθ1, and the height H5 of the lower folding plate is less than or equal to H2 / cosθ2, wherein H1 is the height of the upper flat plate, and H2 is the height of the lower flat plate.

[0015] Preferably, the included angle θ between the upper folding plate and the upper folding plate window fin and the included angle θ between the lower folding plate and the lower folding plate window fin are both 90°.

[0016] Preferably, the number n of the upper folding plate window fins and the number n of the lower folding plate window fins are both less than L / (L3+L4), and 1≤L3 / L4≤2, wherein L is the length of the flat heating element, L3 is the height of the window fin, and L4 is the distance between two adjacent window fins.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a high-power-density K-type heating element, comprising a flat heating element, wherein an upper folding plate is provided on the upper portion of a non-radiating surface of the flat heating element, and an upper folding plate with window fins is provided on the upper folding plate; a lower folding plate is provided on the lower portion of the non-radiating surface of the flat heating element, and a lower folding plate with window fins is provided on the lower folding plate; on the basis of the flat heating element, a certain number of window fins are added to the non-radiating surface design of the upper and lower flat plates, so as to increase the convective heat exchange of the non-radiating surface of the heating element, and more heat is quickly introduced into the room through convective heat exchange without affecting the radiation effect, so as to heat the room faster and reduce the surface temperature of the heating element at the same time, thereby reducing the thickness of the flat plate and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a high power density K-type heating element provided by the present invention;

[0021] Figure 2 A schematic diagram of the structure of a window-opening fin portion in a high-power-density K-type heating element provided by the present invention;

[0022] Figure 3 A longitudinal cross-sectional view of a high power density K-type heating element provided by the present invention;

[0023] Figure 4 It is a partial orthographic projection view of a window-opening fin of a high-power-density K-type heating element provided by the present invention;

[0024] Figure 5 A schematic diagram of the height direction of the window fin portion of a high power density K-type heating element provided by the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1 and 2 The present invention provides a technical solution: a high power density K-type heating element, comprising a flat heating element, an upper folding plate 6 is provided on the upper part of the non-radiating surface of the flat heating element, an upper folding plate 6 is provided with an upper folding plate window fin 7, a lower folding plate 5 is provided on the lower part of the non-radiating surface of the flat heating element, and a lower folding plate 5 is provided with a lower folding plate window fin 8.

[0029] As an embodiment, the flat heating element includes a heating tube, which is a cylindrical structure with an inner wall 1 and an outer wall 2. The upper part of the heating tube is connected to an upper flat plate 3, and an upper folding plate 6 is obliquely arranged on the non-radiating surface of the upper flat plate 3. The lower part of the heating tube is connected to a lower flat plate 4, and a lower folding plate 5 is obliquely arranged on the non-radiating surface of the lower flat plate 4.

[0030] As an implementation mode, both the upper plate 3 and the lower plate 4 are heating fin plates with corrugated surfaces, and the surfaces are sprayed black, which is the same as the traditional flat plate heating element.

[0031] As an implementation method, Figure 2-5 As shown, due to the limitation of the size of the whole machine, the maximum distance L1 between the upper folding plate 6 and the upper flat plate 3 and the maximum distance L2 between the lower folding plate 5 and the lower flat plate 4 are both less than or equal to 15 mm.

[0032] As an implementation mode, the angle θ1 between the upper folding plate 6 and the upper flat plate 3 and the angle θ2 between the lower folding plate 5 and the lower flat plate 4 are both less than or equal to 20°. Within this angle range, the longest convection heat exchange flow channel can be obtained without occupying a large width of the heat-generating element (the length of the upper heat exchange flow channel is H4×cosθ1 and the length of the lower heat exchange flow channel is H5×cosθ2, where H4 is the height of the upper folding plate 6 and H5 is the height of the lower folding plate 5), so as to fully exchange heat with the air and achieve the best heat exchange effect.

[0033] As an implementation manner, the height H4 of the upper folding plate is less than or equal to H1 / cosθ1, and the height H5 of the lower folding plate is less than or equal to H2 / cosθ2, wherein H1 is the height of the upper flat plate, and H2 is the height of the lower flat plate.

[0034] As an implementation method, the angle θ between the upper folding plate and the upper folding plate window fin and the angle θ between the lower folding plate and the lower folding plate window fin are both 90°, so as to ensure that the hot runner formed between the window pieces has a maximum inlet area to increase the inflow air flow rate to take away more heat.

[0035] As an implementation method, in order to open a larger number of window pieces while ensuring the strength of the folding piece after the window is opened, the number n of window fins on the upper folding plate and the number n of window fins on the lower folding plate are both less than L / (L3+L4), and 1≤L3 / L4≤2, wherein L is the length of the flat heating element, L3 is the height of the window fin, and L4 is the distance between two adjacent window fins.

[0036] The present invention provides a high power density K-type heating element. On the basis of a flat heating element, a certain number of window fins are added to the non-radiating surfaces of the upper and lower flat plates to increase the convective heat exchange of the non-radiating surfaces of the heating element. Without affecting the radiation effect, more heat is quickly introduced into the room through convective heat exchange, so as to achieve the effect of heating the room faster and reducing the surface temperature of the heating element to reduce the thickness of the flat plate and reduce the cost. According to calculations, when the width of the same heating element is compared, the power density of the K-type heating element is 1.5≤P / L≤2.2 (wherein the length of the heating element is L and the power is P), and the power density of the original flat heating element is less than 1.5. After the heat exchange effect is enhanced, when the power of the heating element is the same, the surface temperature of the heating element is lowered relative to the surface temperature of the original flat heating element, the minimum thickness of the corresponding deformation is reduced, and the material can be reduced to reduce the cost. At the same time, after the heat exchange effect is improved, under the same temperature rise limit of the whole machine, the power of the heating element can be increased to improve the power density, so as to achieve higher power with the same size, that is, the heater with the same power can be reduced in size.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high power density K-type heating element, comprising a flat heating element, characterized in that: An upper folding plate is provided on the upper part of the non-radiating surface of the flat heating element, and an upper folding plate with an upper folding plate window fin is provided on the upper part of the flat heating element. A lower folding plate is provided on the lower part of the non-radiating surface of the flat heating element, and a lower folding plate with a lower folding plate window fin is provided on the lower part of the flat heating element.

2. The high power density K-type heating element according to claim 1, characterized in that: The flat heating element comprises a heating tube, the upper portion of the heating tube is connected to an upper flat plate, the upper folding plate is obliquely arranged on the non-radiating surface of the upper flat plate, the lower portion of the heating tube is connected to a lower flat plate, and the lower folding plate is obliquely arranged on the non-radiating surface of the lower flat plate.

3. The high power density K-type heating element according to claim 2, characterized in that: The upper plate and the lower plate both adopt heating fin plates with corrugated surfaces, and the surfaces thereof are sprayed black.

4. The high power density K-type heating element according to claim 2, characterized in that: A maximum distance L1 between the upper folding plate and the upper flat plate and a maximum distance L2 between the lower folding plate and the lower flat plate are both less than or equal to 15 mm.

5. The high power density K-type heating element according to claim 2, characterized in that: An included angle θ1 between the upper folding plate and the upper flat plate and an included angle θ2 between the lower folding plate and the lower flat plate are both less than or equal to 20°.

6. The high power density K-type heating element according to claim 5, characterized in that: The height H4 of the upper folding plate is less than or equal to H1 / cosθ1, and the height H5 of the lower folding plate is less than or equal to H2 / cosθ2, wherein H1 is the height of the upper flat plate, and H2 is the height of the lower flat plate.

7. The high power density K-type heating element according to claim 1, characterized in that: The included angle θ between the upper folding plate and the window fin of the upper folding plate and the included angle θ between the lower folding plate and the window fin of the lower folding plate are both 90°.

8. The high power density K-type heating element according to claim 1, characterized in that: The number n of the upper folding plate window fins and the number n of the lower folding plate window fins are both less than L / (L3+L4), and 1≤L3 / L4≤2, wherein L is the length of the flat heating element, L3 is the height of the window fin, and L4 is the distance between two adjacent window fins.

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