CN111486500A

CN111486500A - Electric heater

Info

Publication number: CN111486500A
Application number: CN202010459539.9A
Authority: CN
Inventors: 于博; 张健; 赵万东
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2020-08-04

Abstract

The electric heater provided by the invention comprises: the shell comprises an accommodating cavity and a heat dissipation opening, and the heat dissipation opening is arranged along the lateral direction of the shell and is communicated with the accommodating cavity; the heating plate is arranged in the accommodating cavity and comprises a first heating surface and a second heating surface which are arranged oppositely, the first heating surface faces the heat dissipation opening, and the surface radiation rate of the first heating surface is higher than that of the second heating surface. Set up the board that generates heat that has different surface radiance surfaces in the casing, the board that generates heat is with the one side orientation thermovent that the radiance is high, through the form of heat radiation, to the regional high-efficient heat transfer of heating, improves the regional temperature of heating fast, and the one side orientation that the radiance is low sets up the thermovent dorsad, reduces the heat to casing conduction, reduces the heat and scatters and disappears, improves thermal utilization efficiency, realizes the one-way heat transfer of high performance.

Description

Electric heater

Technical Field

The invention relates to the technical field of household appliances, in particular to an electric heater.

Background

The electric heater includes as common heating installation in daily life: PTC electric heater, heat radiation electric heater, electric heat spit of fland room heater, different types such as electric heat diaphragm type electric heater, wherein the electric heat diaphragm type electric heater is as using natural convection heat transfer and radiation heat transfer as the principle, and natural convection utilizes the density difference of cold and hot air as power, drives the room air circulation, adjusts indoor temperature, and radiation heat is absorbed by the human body and the clothes of wearing easily, and human body heating is effectual, energy-efficient.

However, the electric heating film type electric heater is directly floated due to natural convection hot air in the heating process, heat is directly conveyed to the top of a room and cannot be directly conveyed to a personnel activity area, so that the air temperature of the upper part in the room is higher, the air temperature of the personnel activity area of the lower part is lower, the temperature layering in the vertical direction is obvious, the heat utilization efficiency is lower, and the thermal comfort of a human body is poorer.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect of low heat utilization efficiency of the electric heater in the prior art, thereby providing the electric heater.

The invention provides an electric heater, comprising:

the shell comprises an accommodating cavity and a heat dissipation port, and the heat dissipation port is arranged along the lateral direction of the shell and is communicated with the accommodating cavity;

the heating plate is arranged in the accommodating cavity and comprises a first heating surface and a second heating surface which are arranged oppositely, the first heating surface faces the heat dissipation opening, and the surface radiation rate of the first heating surface is higher than that of the second heating surface.

The electric heater still includes: the air guide cavity is formed between one side of the shell, which is different from the heat dissipation opening, and the heating plate;

the air inlet cavity is arranged at the bottom side of the air guide cavity and is provided with an air inlet, the air inlet cavity is communicated with the air guide cavity, and a cross-flow fan is arranged in the air inlet cavity and is suitable for providing power for the flow of air;

the baffles are respectively arranged on two sides of the heating plate, an air outlet cavity formed by the baffles is formed between the heating plate and the shell, and air flow entering the air guide cavity flows out through the air outlet cavity.

And an air outlet is arranged at the position of the shell corresponding to the air outlet cavity.

The air outlet is in a strip slit shape, is arranged along the vertical direction and is respectively arranged at two sides of the heat dissipation opening.

The air guide cavity further comprises a guide plate, and the guide plate is arranged on one side of the heating plate back to the heat dissipation port.

The guide plate with generate heat the board parallel arrangement, on the guide plate with generate heat the side that the board is relative be the plane of reflection, the plane of reflection is suitable for the reflection heat radiation, the surface radiance of plane of reflection is less than the surface radiance of first face of generating heat.

The electric heater also comprises an air guide plate which is arranged in the air inlet cavity, and the upper end of the air guide plate is connected with the lower end of the guide plate.

A mesh enclosure is arranged at the heat dissipation opening, and the aperture ratio of the mesh enclosure is not less than 50%;

the air inlet is provided with a grating, and the aperture ratio of the grating is not less than 50%.

The surface emissivity of the first heating surface is not lower than 0.8, the surface emissivity of the second heating surface is not higher than 0.3, and the surface emissivity of the reflecting surface is not higher than 0.3.

The air outlet cavity and the air guide cavity are arranged in a square shape and are perpendicular to each other.

The technical scheme of the invention has the following advantages:

1. the electric heater provided by the invention comprises: the shell comprises an accommodating cavity and a heat dissipation port, wherein the heat dissipation port is arranged along the lateral direction of the shell and is communicated with the accommodating cavity; the heating plate is arranged in the accommodating cavity and comprises a first heating surface and a second heating surface which are arranged oppositely, the first heating surface faces the heat dissipation opening, and the surface radiation rate of the first heating surface is higher than that of the second heating surface.

Set up the board that generates heat that has different surface radiance surfaces in the casing, the board that generates heat is with the one side orientation thermovent that the radiance is high, through the form of heat radiation, to the regional high-efficient heat transfer of heating, improves the regional temperature of heating fast, and the one side orientation that the radiance is low sets up the thermovent dorsad, reduces the heat to casing conduction, reduces the heat and scatters and disappears, improves thermal utilization efficiency, realizes the one-way heat transfer of high performance.

2. According to the electric heater provided by the invention, the air outlet is formed in the position, corresponding to the air outlet cavity, of the shell.

The air inlet cavity is arranged at the bottom side of the air guide cavity, the air outlet cavity is formed by the baffles at two sides of the heating plate and is communicated with the air guide cavity, and meanwhile, the air inlet corresponds to the air outlet cavity in position, so that the air inlet is arranged at the lower end of the air outlet, the air outlet blows out air flow heated by the heating plate and diffuses towards the surrounding air, and hot air flow can float upwards under the action of buoyancy.

3. According to the electric heater provided by the invention, the air outlet is in a strip seam shape, is arranged along the vertical direction and is respectively arranged at two sides of the heat dissipation opening.

The air outlet sets up like this, the air current that the messenger was heated by the board that generates heat blows off from the air outlet that is the strip seam form, the hot gas flow diffuses gradually at the flow in-process, and carry out the heat exchange with cold air on every side, cold air around the heating, adopt the design of two strip seam type air outlets, on the one hand, the air outlet is narrower, air-out speed is faster, the hot gas flow is farther to the place ahead transmission distance, enlarge personnel's heating region, on the other hand, the setting in many air outlets, make the regional air temperature homogeneity of heating better, improve personnel's activity region environment thermal.

4. According to the electric heater provided by the invention, the guide plate and the heating plate are arranged in parallel, the side surface of the guide plate opposite to the heating plate is a reflecting surface, the reflecting surface is suitable for reflecting heat radiation, and the surface radiance of the reflecting surface is smaller than that of the first heating surface.

The guide plate is relative and parallel arrangement with the board that generates heat, air heating runner has been constituted, at the in-process that the guide air flows, the heated air, and simultaneously, the plane of reflection on the guide plate is through improving the reflectivity, reduce the surface radiance, come the heat radiation that the reflection part comes from the second surface of generating heat, reduce the heat absorption of guide plate to heat radiation, reduce the heat that the board that generates heat scatters and disappears from the electric fan heater backshell, reduce electric fan heater backshell temperature, effectively improve the thermal efficiency of device, in addition, still give out heat to the lower second surface of generating heat of surface radiance and supply, guarantee that the air that gets into and hold the chamber is by.

5. According to the electric heater provided by the invention, the mesh enclosure is arranged at the heat dissipation opening, and the aperture ratio of the mesh enclosure is not less than 50%; the air inlet is provided with a grating, and the aperture ratio of the grating is not less than 50%.

The mesh enclosure and the grille are arranged at the heat dissipation opening and the air inlet respectively, so that a user is prevented from contacting with the heating plate or the cross-flow fan, the safety of the electric heater is improved, and the situations that the heating plate or the cross-flow fan contacts with the outside and is further damaged by collision and the like are also avoided; on the other hand, the high aperture ratio of the air inlet where the grille is positioned can reduce the air inlet resistance and improve the air inlet quantity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of an electric heater provided in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the electric heater shown in FIG. 1;

fig. 3 is a schematic view of an internal structure of the electric heater shown in fig. 1;

fig. 4 is a schematic view of an internal structure of the electric heater shown in fig. 1 at another angle;

fig. 5 is a schematic cross-sectional view of the electric heater shown in fig. 1 at another angle.

Description of reference numerals:

1-a shell; 2-a heating plate; 3-a flow guide plate; 4-a holding cavity; 5-a heat dissipation port; 6-cross flow fan; 41-a wind guide cavity; 42-an air inlet cavity; 43-air outlet cavity; 421-an air inlet; 431-an air outlet; 31-a reflective surface; 52-mesh enclosure; 422-a grid; 21-a first heating surface; 22-second heating surface.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 5, the present embodiment provides an electric heater including a housing 1 and a base. The shell 1 is a square shell 1, and two strip-shaped bearing bases are arranged on the bottom side of the shell in parallel.

Casing 1 is including holding chamber 4 and thermovent 5, wherein thermovent 5 with hold chamber 4 intercommunication, and set up on the biggest one side of casing 1 week side area, the last setting of thermovent 5 has screen panel 52, the aperture ratio of screen panel 52 is not less than 50%, the restriction is not done to the concrete form of screen panel 52, can be circular, rhombus or waist type poroid etc. in this embodiment, be even round hole on the screen panel 52, and screen panel 52 sets up with casing 1 surface is integrative, the setting range of mesh suits with the size of board 2 that generates heat, the shared area is similar the same.

The heating plate 2 is in a square plate shape and is fixed inside the accommodating cavity 4, and comprises a first heating surface 21 and a second heating surface 22 which are oppositely arranged, the first heating surface 21 faces the heat dissipation opening 5, the heating plate 2 is parallel to the surface of the shell 1 where the heat dissipation opening 5 is located, the surface radiation rate of the first heating surface 21 is higher than that of the second heating surface 22, and the radiation rate is the capacity of measuring the relative strength of the surface of an object in the form of radiation, so that the heating quantity of the first heating surface 21 is higher than that of the second heating surface 22 in a unit time in the working process of the heating plate 2, in the embodiment, the heating plate 2 is a high-radiation-rate coated aluminum alloy heating plate, as other embodiments, the heating plate 2 can also be an electric heating element such as a mica electric heating film, a silicon crystal, a carbon crystal heating plate, and the like, the first heating surface 21 is coated by a high-radiation-rate material, and the surface radiation rate is not less than 0.8, the second heating surface 22 is made of low-emissivity material, and the surface emissivity is less than or equal to 0.3.

Set up the board 2 that generates heat that has different surface radiance surfaces in casing 1, the one side that the board 2 that generates heat is high with the radiance is towards thermovent 5, through the form of heat radiation, to the regional high-efficient heat transfer of heating, improves the regional temperature of heating fast, and the one side orientation that the radiance is low sets up in the thermovent 5 dorsad, reduces to the heat of casing 1 conduction, reduces the heat and scatters and disappears, improves thermal utilization efficiency, realizes the one-way heat transfer of high performance.

As shown in fig. 2-4, the accommodating chamber 4 includes an air guiding chamber 41, an air inlet chamber 42 and an air outlet chamber 43.

In this embodiment, the air guiding cavity 41 is defined by the heating plate 2, the air guiding plate 3 and a part of the baffle plates, the air guiding plate 3 is in a square plate shape and is arranged on one side of the heating plate 2, which faces away from the heat dissipating port 5, the second heating surface 22 of the heating plate 2 is arranged towards the inner side of the air guiding cavity 41, the air guiding plate 3 is fixed with two lateral baffle plates perpendicular to the air guiding cavity 3, in addition, two lateral baffle plates are also arranged on two sides of the heating plate 2, and the air guiding cavity 41 and the air outlet cavity 43 are jointly formed by the air guiding plate 3, the heating plate 2 and the corresponding. The air outlet cavity 43 is arranged at two sides of the air guide cavity, the guide plate 3 and the heating plate 2 are arranged in parallel, the side surface of the guide plate 3 opposite to the second heating surface 22 is a reflecting surface 31, the surface of the reflecting surface 31 is made of a material with low emissivity and high reflectivity, the heat radiation can be partially reflected, and the surface emissivity of the reflecting surface 31 is less than or equal to 0.3 and is smaller than that of the first heating surface 21.

Guide plate

3 and 2 relative and parallel arrangement of board that generate heat, the air heating runner has been constituted, at the in-process that the guide air flows, heating air, and simultaneously, reflecting surface 31 on the guide plate 3 is through improving the reflectivity, reduce the surface radiance, come the heat radiation that the reflection part comes from second heating surface 22, reduce the heat absorption of guide plate 3 to heat radiation, reduce the heat that board 2 that generates heat scatters and disappears from the electric fan heater backshell, reduce electric fan heater backshell temperature, effectively improve the device's thermal efficiency, in addition, still give out heat to the lower second heating surface 22 of surface radiance and supply, guarantee that the air that gets into and hold chamber 4 is by effective heating.

As an alternative embodiment, the baffle 3 may not be provided, and the air guiding chamber 41 may be composed of the inner wall of the casing 1 on the side different from the heat dissipation port 5 and the heat generating plate 2.

In this embodiment, the air inlet cavity 42 is disposed at the bottom side of the air guiding cavity 41 and is provided with an air inlet 421, the air outlet cavity 43 is disposed at two sides of the air guiding cavity 41 and is communicated with the air guiding cavity 41, an air outlet 431 is disposed at a corresponding position on the air outlet cavity 43, the air inlet 421, the air outlet 431 and the heat dissipating port 5 are disposed on the same end surface of the housing 1, the air outlet 431 is disposed at two sides of the mesh enclosure 52, and the air inlet 421 provided with the grille 422 is disposed at the bottom side of. As an alternative embodiment, the air outlet 431 and the air outlet chamber 43 may be disposed in a staggered manner and communicate with each other by way of a pipe or the like.

The top end of one side of the air inlet cavity 42, which is back to the air inlet 421, is provided with an air guide channel communicated with the air guide cavity 41, an air deflector in the air inlet cavity is in a curved surface shape, the bottom end of the air deflector is fixed with the bottom surface of the air inlet cavity, the top end of the air deflector is fixed with the lower end of the air deflector, the air inlet cavity 42 and the air guide cavity 41 are separated by a horizontally arranged bearing plate part, one end of the bearing plate, which is back to the heat dissipation opening 5, is fixed with a heating plate 2, the arrangement jointly forms the air guide channel, and the.

As shown in fig. 3, the air outlet chamber 43 and the air guiding chamber 41 are both arranged in a square space, are perpendicular to each other, are communicated with each other, and are in a concave shape after being communicated with each other.

Because the air inlet cavity 42 is arranged at the bottom side of the air guide cavity 41, the air outlet cavity 43 is formed by baffles at two sides of the heating plate 2 and is communicated with the air guide cavity 41, and meanwhile, the air inlet 421 corresponds to the air outlet cavity 43, the air inlet 421 is arranged at the lower end of the air outlet 431, the air outlet 431 blows out the air flow heated by the heating plate 2 and diffuses towards the ambient air, and the hot air flow floats upwards under the action of buoyancy, the arrangement prevents the hot air flow blown out from the air outlet 431 from being sucked into the electric heater by the cross flow fan 6 to be heated again and sucking air with lower temperature at the bottom side, and improves the heating efficiency of the device.

In the present embodiment, the air outlets 431 are slit-shaped and are disposed along the vertical direction and are respectively disposed on two sides of the heat dissipation opening 5, and the extending length of the air outlets 431 is approximately equal to the extending length of the mesh openings of the mesh enclosure 52 in the vertical direction. The air outlet 431 is arranged like this, make the air current that is heated by the heating plate 2 blow off from being the air outlet 431 of strip seam form, the hot gas flow spreads gradually in the flow process, and carry out the heat exchange with cold air on every side, heat cold air on every side, adopt the design of two strip seam type air outlets 431, on the one hand, the air outlet 431 is narrower, the air-out speed is faster, hot gas flow is farther to the place ahead transmission distance, enlarge personnel's heating region, on the other hand, the setting of many air outlets 431, make the regional air temperature homogeneity of heating better, improve the regional thermal comfort of personnel's activity.

The width of the air outlet 431 is 1mm to 4mm, in this embodiment, the air outlet 431 is a rectangular long hole, and the horizontal width is 2.5 mm. As an alternative embodiment, the width of the outlet 431 may be adjusted according to factors such as the type of the cross flow fan 6. In the specific implementation, the design of double slit type air outlets is adopted, compared with the prior art, the hot air flow is farther to the front, the heating range in front of the electric heater is larger, the air temperature is 20.3 ℃ higher than that of the position 0.8m away from the electric heater and 0.8m away from the ground, 2.8 ℃ higher than that of the upper air outlet, and the air temperature is 0.6 ℃ higher than that of the position 1.2m away from the electric heater and 0.8m away from the ground.

In this embodiment, the mesh enclosure 52 and the grille 422 are respectively disposed at the heat dissipation opening 5 and the air inlet 421, and the aperture ratio of the mesh enclosure 52 and the grille 422 is not less than 50%. The arrangement avoids the contact between a user and the heating plate 2 or the cross flow fan 6, improves the safety of the electric heater, and also avoids the contact between the heating plate 2 or the cross flow fan 6 and the outside, further the collision and damage and other situations, in addition, the aperture ratio of the mesh enclosure 52 and the grating 422 is not less than 50 percent, and on one hand, the aperture ratio of the heat dissipation port 5 where the mesh enclosure 52 is positioned is high, so that the heat radiated to the outside by the heating plate 2 can be increased, and the heating effect of a human body is improved; on the other hand, the high opening rate of the air inlet 421 where the grille 422 is located can reduce the air inlet resistance and improve the air inlet volume.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. An electric heater, comprising:

the shell (1) comprises an accommodating cavity (4) and a heat dissipation port (5), wherein the heat dissipation port (5) is arranged along the lateral direction of the shell (1) and is communicated with the accommodating cavity (4);

the heating plate (2) is arranged in the accommodating cavity (4) and comprises a first heating surface (21) and a second heating surface (22) which are arranged oppositely, the first heating surface (21) faces the heat dissipation opening (5), and the surface radiance of the first heating surface (21) is higher than that of the second heating surface (22).

2. The electric heater of claim 1, further comprising:

the air guide cavity (41) is formed between one side of the shell (1), which is different from the heat dissipation port (5), and the heating plate (2);

the air inlet cavity (42) is arranged at the bottom side of the air guide cavity (41) and is provided with an air inlet (421), the air inlet cavity (42) is communicated with the air guide cavity (41), and a cross-flow fan (6) is arranged in the air inlet cavity and is suitable for providing power for the flow of air;

the baffles are respectively arranged on two sides of the heating plate (2), an air outlet cavity (43) formed by the baffles is formed between the heating plate (2) and the shell (1), and air flow entering the air guide cavity (41) flows out through the air outlet cavity (43).

3. The electric heater according to claim 2, characterized in that an air outlet (431) is provided at a position of the housing (1) corresponding to the air outlet chamber (43).

4. The electric heater according to claim 3, characterized in that the air outlet (431) is slit-shaped, is arranged along the vertical direction, and is respectively arranged at two sides of the heat dissipation opening (5).

5. The electric heater according to any of the claims 2-4, characterized in that the air guiding cavity (41) further comprises a guiding plate (3), and the guiding plate (3) is disposed on a side of the heating plate (2) facing away from the heat dissipating opening (5).

6. The electric heater according to claim 5, characterized in that the flow guiding plate (3) and the heating plate (2) are arranged in parallel, the side of the flow guiding plate (3) opposite to the heating plate (2) is a reflecting surface (31), the reflecting surface (31) is suitable for reflecting heat radiation, and the surface emissivity of the reflecting surface (31) is smaller than the surface emissivity of the first heating surface (21).

7. The electric heater according to claim 6, further comprising an air guiding plate disposed in the air inlet chamber (42), wherein an upper end of the air guiding plate is connected to a lower end of the air guiding plate (3).

8. The electric heater of claim 2,

a mesh enclosure (52) is arranged at the heat dissipation port (5), and the aperture ratio of the mesh enclosure (52) is not less than 50%;

the air inlet (421) is provided with a grating (422), and the aperture ratio of the grating (422) is not less than 50%.

9. The electric heater according to claim 6, wherein the surface emissivity of the first heating surface (21) is not lower than 0.8, the surface emissivity of the second heating surface (22) is not higher than 0.3, and the surface emissivity of the reflecting surface (31) is not higher than 0.3.

10. The electric heater according to claim 2, characterized in that the air outlet cavity (43) and the air guide cavity (41) are both square and perpendicular to each other.