An electric heater

Abstract

The present invention provides an electric heater, wherein a side housing is connected to a main housing, at least a part of the side housing is provided with an air return opening, and a through hole for air to pass through is provided between the main housing and the side housing. In the present invention, by providing the air return opening, the cold air from the outside can cool the side housing and the electrical components inside the side housing. First, it can prevent the heat inside the side housing from causing the side housing and the electrical components inside to have too high a temperature rise, shortening the service life of the electrical components, or even short-circuiting and burning out. Second, the heat inside the side housing can be used to preliminarily heat the cold air entering the side housing. The preliminarily heated cold air enters the main housing. Since the cold air has been preliminarily heated at this time, the power consumption of the heating device itself can be reduced, which helps to reduce the overall energy consumption and improve the heat utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heaters, and particularly to an electric heater that can effectively reduce the temperature of electrical components inside the side housing. Background Art

[0002] Electric heaters are widely used electrical appliances in people's lives, and the indoor temperature can be quickly increased through an electric heater. An electric heater usually includes a main housing and a side housing. A heating device is arranged inside the main housing, and electrical components are arranged inside the side housing. The electrical components are used to control the start and heating time of the heating device.

[0003] In the existing electric heaters, the heat generated by the heating device usually enters the side housing. The side housing of the electric heater is generally an injection molded part, which is easy to absorb the heat radiation, resulting in too high temperatures of the side housing of the electric heater, the electrical components and the power supply lines inside the side housing, and further problems such as the temperature of the components exceeding the standard, the aging of the lines accelerating, and the reliability decreasing. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the side housing and the electrical components inside the side housing of the existing electric heater are easily damaged by heat.

[0005] To this end, the present invention provides an electric heater, including: a main housing, inside which an air outlet grille and a heating device are arranged; a fan, arranged inside the main housing; a side housing, connected to the main housing, at least a part of the side housing is provided with an air return opening, and a through hole for air to pass through is arranged between the main housing and the side housing.

[0006] For the electric heater provided by the present invention, an accommodation cavity is arranged inside the side housing, the accommodation cavity includes an air guiding cavity located above, and a heating cavity arranged below the air guiding cavity and communicated with the air guiding cavity, and the through hole is arranged on the air guiding cavity.

[0007] For the electric heater provided by the present invention, the fan is a cross-flow fan.

[0008] For the electric heater provided by the present invention, the cross-flow fan is arranged opposite to the air outlet grille.

[0009] For the electric heater provided by the present invention, the cross-flow fan and the air outlet grille are arranged at the lower position of the main housing.

[0010] For the electric heater provided by the present invention, a fan air duct is arranged inside the main housing below the cross-flow fan, one end of the fan air duct faces the air guiding cavity, and the other end faces the air outlet grille.

[0011] The electric heater provided by the present invention has an electrothermal film as the heating device, and heat dissipation holes are provided at the position of the main housing corresponding to the radiation surface of the electrothermal film.

[0012] The technical solution of the present invention has the following advantages:

[0013] 1. For the electric heater provided by the present invention, the side housing is connected to the main housing, at least a part of the side housing is provided with an air return opening, and a through hole for air to pass through is provided between the main housing and the side housing.

[0014] During the operation of the electric heater, the outside cold air enters the side housing through the air return opening on the side housing, and then further enters the main housing through the through hole between the side housing and the main housing. Under the action of the heating device and the blower, the outside cold air is heated up and then flows out from the air outlet grille.

[0015] In the present invention, by providing the air return opening, the outside cold air can cool the side housing and the electrical components inside the side housing. First, it can prevent the heat inside the side housing from causing the temperature rise of the side housing and the electrical components inside to be too high, shortening the service life of the electrical components, or even short-circuiting and burning out. It can also preliminarily heat the cold air entering the side housing through the heat inside the side housing. The cold air that has been preliminarily heated enters the main housing. Since the cold air has been preliminarily heated at this time, the power consumption of the heating device itself can be reduced, which helps to reduce the overall energy consumption and improve the heat utilization efficiency.

[0016] 2. For the electric heater provided by the present invention, an accommodation cavity is provided inside the side housing. The accommodation cavity includes an air guiding cavity located above and a heating cavity provided below the air guiding cavity and communicating with the air guiding cavity. The through hole is provided on the air guiding cavity.

[0017] By providing the air guiding cavity and the through hole, the outside cold air directly flows to the position of the heating device through the upper part of the accommodation cavity of the side housing, and sufficient heat exchange is carried out with the heating device.

[0018] 3. For the electric heater provided by the present invention, the cross-flow blower is arranged opposite to the air outlet grille. At this time, the hot air accelerated by the cross-flow blower will directly flow out to the outside of the electric heater through the air outlet grille, which can avoid the hot air being blocked by other parts of the main housing and causing the wind force to be damaged.

[0019] 3. For the electric heater provided by the present invention, the cross-flow blower and the air outlet grille are arranged at the lower position of the main housing.

[0020] Since the air flowing in through the side housing first flows into the lower heating chamber through the air guiding chamber located above, at this time, the cross-flow fan is arranged below the main housing, so that the air entering the main housing can fully exchange heat with the heating device above the cross-flow fan, thereby increasing the heating capacity of the air.

[0021] 4. For the electric heater provided by the present invention, a fan air duct is arranged below the cross-flow fan inside the main housing, one end of the fan air duct faces the air guiding chamber, and the other end faces the air outlet grille.

[0022] By arranging the fan air duct, the hot air flowing down from above the main housing can fully flow to the position of the air outlet grille, avoiding the hot air flowing below the air outlet grille, which will cause disturbance to the normal flow of the hot air inside the main housing while losing heat.

[0023] 5. For the electric heater provided by the present invention, heat dissipation holes are arranged at the part of the main housing corresponding to the radiation surface of the electrothermal film.

[0024] Since the electrothermal film is used for heating, at this time, the electrothermal film will generate certain heat radiation. Therefore, in order to make full use of this part of heat radiation, heat dissipation holes are arranged on the main housing. At this time, the heat radiation will directly act on the human body through the heat dissipation holes, improving the utilization rate of heat radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the electric heater provided in Embodiment 1 of the present invention;

[0027] Figure 2 It is the first layout diagram of the air return opening in the electric heater provided by the present invention;

[0028] Figure 3 It is the second layout diagram of the air return opening in the electric heater provided by the present invention;

[0029] Figure 4 It is the third layout diagram of the air return opening in the electric heater provided by the present invention;

[0030] Figure 5 It is a schematic structural diagram of the electric heater provided in Embodiment 2 of the present invention;

[0031] Figure 6Schematic diagram of the flow of hot air in the electric heater provided by the present invention.

[0032] Explanation of reference numerals:

[0033] 1 - Main housing; 2 - Air outlet grille; 3 - Fan; 4 - Side housing; 5 - Air return opening; 6 - Air guiding cavity; 7 - Heating cavity; 8 - Fan air duct; 9 - Heat dissipation holes; 10 - Electric heating film; 11 - PTC thermistor. Detailed implementation manners

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Embodiment 1

[0039] This embodiment provides an electric heater, as Figure 1 shown, including: a main housing 1, inside which an air outlet grille 2 and a heating device are provided; a fan 3, arranged inside the main housing 1; a side housing 4, connected to the main housing 1, at least a part of the side housing 4 is provided with an air return opening 5, and a through hole for air to pass through is provided between the main housing 1 and the side housing 4, and the through hole is not shown in the figure.

[0040] In this embodiment, by providing an air return opening 5, the cold air from the outside can cool the side housing 4 and the electrical components inside the side housing 4. First, it can prevent the heat inside the side housing from causing the temperature of the side housing and the internal electrical components to rise too high, shortening the service life of the electrical components, or even causing short circuits and burnout. It can also preliminarily heat the cold air entering the side housing 4 with the heat inside the side housing 4. The preliminarily heated cold air enters the main housing 1. Since the cold air has been preliminarily heated at this time, the power consumption of the heating device itself can be reduced, which helps to reduce the overall energy consumption and improve the heat utilization efficiency. Specifically, as Figure 6 shown, which shows the air flow path in the electric heater provided in this embodiment.

[0041] Specifically, the shapes of the air return opening 5 and the through hole are not overly restricted in this embodiment and can be round holes, square holes, or any other shape. At the same time, the number of the air return opening 5 and the through hole is also not restricted and can be adaptively adjusted according to the actual working conditions.

[0042] In this embodiment, in order to achieve the air connection between the side housing 4 and the main housing 1, a receiving cavity is provided inside the side housing 4. As Figure 2 shown, the receiving cavity includes an air guiding cavity 6 located above, and a heating cavity 7 provided below the air guiding cavity 6 and communicating with the air guiding cavity 6. The through hole is provided on the air guiding cavity 6. By providing the air guiding cavity 6 and the through hole, the outside cold air can directly flow to the position of the heating device through the upper part of the receiving cavity of the side housing 4 and exchange heat with the heating device sufficiently. Specifically, the air guiding cavity 6 and the heating cavity 7 communicate with each other.

[0043] As a variant, the through hole can also be provided on the heating cavity 7. At this time, in order to achieve a better guiding effect, the air return opening 5 can be correspondingly lowered so that the air return opening 5 and the through hole are oppositely arranged.

[0044] As a preferred embodiment, in this embodiment, as Figure 1 shown, the air return opening 5 is provided at the upper position of the side housing 4. As a variant, as Figure 2 , Figure 3 and Figure 4 shown, the air return opening 5 can be provided on the side wall position of the entire side housing 4, or at the lower position of the side housing 4, or at the upper position of the side housing 4. At the same time, the air return opening can be provided on a part of the side wall of the side housing 4 or on the entire side wall of the side housing 4.

[0045] In the electric heater provided in this embodiment, the blower 3 is a cross-flow blower 3. As a variant, the blower 3 can adopt other forms as long as it can achieve the air guiding function.

[0046] Specifically, the cross-flow fan 3 is disposed opposite to the air outlet grille 2. At this time, the hot air accelerated by the cross-flow fan 3 will directly flow out to the outside of the electric heater through the air outlet grille 2, which can prevent the hot air from being blocked by other parts of the main housing 1 and causing damage to the wind force.

[0047] As a variant, the cross-flow fan 3 can be disposed above or below the air outlet grille 2. At this time, since there is a certain angle between the cross-flow fan 3 and the air outlet grille 2, the wind flowing out from the air outlet grille 2 can form a certain angle with the ground.

[0048] In this embodiment, the cross-flow fan 3 and the air outlet grille 2 are disposed at the lower position of the main housing 1. Since the wind flowing in through the side housing 4 first flows into the lower heating chamber 7 through the upper air guiding chamber 6, at this time, by disposing the cross-flow fan 3 below the main housing 1, the wind entering the main housing 1 can fully exchange heat with the heating device above the cross-flow fan 3, thereby increasing the heating capacity of the wind.

[0049] Meanwhile, in order to further improve the utilization rate of the hot air, a fan air duct 8 is disposed below the cross-flow fan 3 inside the main housing 1. One end of the fan air duct 8 faces the air guiding chamber 6, and the other end faces the air outlet grille 2. By providing the fan air duct 8, the hot air flowing down from above the main housing 1 can fully flow to the position of the air outlet grille 2, preventing the hot air from flowing below the air outlet grille 2, losing heat, and disturbing the normal flow of the hot air inside the main housing 1.

[0050] Specifically, the fan air duct 8 itself has a certain curvature. The fan air duct 8 can be set with the same curvature as the corresponding section of the cross-flow fan 3, or can be adjusted according to the actual working conditions. One end of the fan air duct 8 abuts against the inner wall of the main housing 1, and the other end abuts against the bottom position of the air outlet grille 2.

[0051] The electric heater provided in this embodiment, as Figure 1 shown, the heating device is an electric heating film 10. At the same time, heat dissipation holes 9 are provided at the part of the main housing 1 corresponding to the radiation surface of the electric heating film 10.

[0052] Since the electric heating film is used for heating, at this time, the electric heating film 10 will generate a certain amount of heat radiation. Therefore, in order to make full use of this part of the heat radiation, heat dissipation holes 9 are provided on the main housing 1. At this time, the heat radiation will directly act on the human body through the heat dissipation holes 9, improving the utilization rate of the heat radiation.

[0053] Specifically, the electric heating film 10 extends along the length direction of the main housing 1, that is, the same as the extension direction of the cross-flow fan 3.

[0054] Embodiment 2

[0055] This embodiment is based on Embodiment 1. In this embodiment, the heating device is the PTC thermistor 11. As Figure 5 shown, at this time, the cross-flow fan 3 is arranged above the PTC thermistor, and the air outlet grille 2 is arranged below the PTC thermistor.

[0056] Obviously, the above embodiments are only examples given for clear illustration, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An electric heater, characterized in that, Comprising: A main housing (1) with an air outlet grille (2) and a heating device disposed inside; A blower (3) disposed inside the main housing (1); A side housing (4) connected to the main housing (1), at least a part of the side housing (4) is provided with an air return opening (5). By providing the air return opening, the cold air from the outside can cool the side housing and the electrical components inside the side housing. There is a through hole for air to pass through between the main housing (1) and the side housing (4); an accommodation cavity is provided inside the side housing (4), and the accommodation cavity includes an air guiding cavity (6) located above and a heating cavity (7) disposed below the air guiding cavity (6) and communicating with the air guiding cavity (6). The through hole is provided on the air guiding cavity (6); The blower (3) is a cross-flow blower. The cross-flow blower (3) and the air outlet grille (2) are disposed at the lower position of the main housing (1). The air flowing in through the side housing (4) first flows into the lower heating cavity (7) through the upper air guiding cavity (6); a blower air duct (8) is provided inside the main housing (1) below the cross-flow blower (3). One end of the blower air duct (8) faces the air guiding cavity (6), and the other end faces the air outlet grille (2).

2. The electric heater according to claim 1, characterized in that, The cross-flow blower is disposed opposite to the air outlet grille (2).

3. The electric heater according to claim 1, characterized in that, The heating device is an electrothermal film (10).

4. The electric heater according to claim 3, characterized in that, Heat dissipation holes (9) are provided at the part of the main housing (1) corresponding to the radiation surface of the electrothermal film (10).

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