Electric heater

Abstract

The present invention relates to an electric heater, comprising: a shell, a first air inlet and a first air outlet are provided on the shell, the shell has a first air duct connected between the first air inlet and the first air outlet, the shell has a top surface, and the first air outlet is provided on the top surface; a heating element installed in the first air duct, the heating element is used to heat the gas entering the first air duct from the first air inlet when powered on; and a fan and a guide member both installed on the shell, the fan and the guide member are connected to blow air to the guide member to drive the hot air flowing out of the first air outlet to blow out from the side of the shell. Under the action of the fan and the guide member, the hot air flowing out of the first air outlet is blown out from the side of the shell, and the blown hot air floats up after flowing along the side of the shell for a certain distance, thereby avoiding the hot air from being directly discharged from the first air outlet located on the top surface of the shell and then floating up, thereby improving the heat transfer rate in the personnel activity area.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, in particular to an electric heater. Background Art

[0002] In order to improve the environment and reduce environmental pollution caused by coal-fired heating, more and more cities are vigorously promoting the "coal to electricity" project and encouraging the use of electric heating technology for heating.

[0003] Electric heaters generally rely on natural convection heat transfer and radiation heat transfer. Natural convection heat transfer uses the density difference between cold and hot gases as power to drive indoor gas circulation, thereby regulating the indoor temperature. The heat from radiation heat transfer is easily absorbed by the human body and the clothes worn by the human body, which has a good heating effect on the human body and is highly efficient and energy-saving.

[0004] However, during the heating process of traditional electric heaters, due to natural convection, the gas floats directly upward and the convection heat is directly transported to the top of the room, while the heat transfer rate in the local activity area of ​​​​people (the area at a certain distance from the side of the electric heater) is slower, resulting in low heat utilization efficiency and poor thermal comfort for the human body. Summary of the invention

[0005] Based on this, it is necessary to provide an electric heater that can improve the heat utilization rate in order to address the problem of low heat utilization rate of traditional electric heaters.

[0006] An electric heater, comprising:

[0007] A housing, wherein a first air inlet and a first air outlet are formed on the housing, the housing has a first air duct connected between the first air inlet and the first air outlet, the housing has a top surface, and the first air outlet is formed on the top surface;

[0008] a heating element installed in the first air duct, the heating element being used to heat the gas entering the first air duct from the first air inlet when powered on; and

[0009] A fan and a guide member are both mounted on the housing, and the fan is connected to the guide member to blow air toward the guide member to drive the hot air flowing out of the first air outlet to be blown out from the side of the housing.

[0010] The above-mentioned electric heater, under the action of the fan and the guide member, makes the hot air flowing out from the first air outlet blow out from the side of the outer shell, and the blown hot air floats up after flowing along the side of the outer shell for a certain distance, thereby avoiding the hot air being directly discharged from the first air outlet located on the top surface of the outer shell and then floating up, thereby improving the heat transfer rate in the personnel activity area, and further improving the heat utilization rate and human comfort.

[0011] In one of the embodiments, the fan is connected to the outside, and is used to suck in external airflow and blow the external airflow toward the guide member.

[0012] In one of the embodiments, the housing further has an assembly cavity, and the fan is assembled in the assembly cavity.

[0013] In one embodiment, the shell includes a main body and an air inlet grille, the air inlet grille is mounted on the main body and defines the assembly cavity with the main body, the fan is connected to the outside through the air inlet grille, and the fan is used to inhale external airflow and blow the external airflow toward the guide member.

[0014] In one embodiment, the assembly cavity and the first air duct are not connected to each other.

[0015] In one embodiment, the guide member is provided with a second air inlet and a second air outlet, and a second air duct connecting the second air inlet and the second air outlet is formed in the guide member;

[0016] The second air inlet is connected to the fan, and the second air outlet is connected to the first air outlet. The airflow blown out from the second air outlet drives the hot air flowing out from the first air outlet to be blown out from the side of the shell.

[0017] In one embodiment, the guide member is a plate-shaped structure, and the guide member has a first end and a second end connected to each other, and the second end extends toward the first end and partially overlaps the inner side of the first end;

[0018] The second air inlet is formed at one end of the guide member close to the fan, the first end and the second end are arranged to form the second air duct, and the second air outlet is formed between the inner part of the second end overlapping the first end and the first end.

[0019] In one embodiment, a first guide curved surface is formed on the inner side of the second end, and the first guide curved surface is adjacent to the second air outlet and is used to guide the airflow in the second air duct to be discharged to the second air outlet.

[0020] In one embodiment, the second air duct has a closed end and an open end that are connected to each other, the open end is connected to the second air outlet, and the closed end is arranged away from the second air outlet relative to the open end;

[0021] The difference between the cross-sectional area of ​​the opening end and the cross-sectional area of ​​the second air outlet is greater than a first preset threshold, so that the flow rate of the airflow blown out from the second air outlet is greater than the second preset threshold to form a negative pressure outside the guide member.

[0022] In one of the embodiments, a cross-sectional area of ​​the second air outlet gradually decreases from an end close to the opening end to an end far from the opening end.

[0023] In one embodiment, a second guide curved surface is formed on the outside of the guide member facing the first air outlet, and the second guide curved surface includes a first sub-guide surface and a second sub-guide surface that are connected to each other, the first sub-guide surface is adjacent to the second air outlet, the first sub-guide surface is inclined relative to the second air outlet toward a side away from the first air outlet, and the end of the second sub-guide surface away from the first sub-guide surface is parallel to the horizontal direction.

[0024] In one embodiment, the air outlet direction of the second air outlet is arranged toward the first air outlet, and the air outlet axis of the second air outlet is arranged obliquely with respect to the air outlet axis of the first air outlet.

[0025] In one embodiment, the second air duct has a closed end and an open end that are connected to each other, the open end is connected to the second air outlet, and the closed end is arranged away from the second air outlet relative to the open end;

[0026] Wherein, the cross-sectional area of ​​the open end is larger than the cross-sectional area of ​​the closed end.

[0027] In one embodiment, the electric heater has a first working mode and a second working mode;

[0028] Wherein, in the first working mode, the heating element is turned on and the fan is turned off; in the second working mode, the heating element is turned on and the fan is turned on.

[0029] In one embodiment, the housing further includes a bottom surface and a side surface connected between the top surface and the bottom surface, and the first air inlet is opened on the bottom surface and / or the side surface.

[0030] In one embodiment, the first air inlet includes a first sub-air inlet and a second sub-air inlet, the first sub-air inlet is opened on the bottom surface, and the second sub-air inlet is opened on the side surface;

[0031] Wherein, the heating element is used for radiant heat transfer, and the second sub-air inlet is also used as a heat radiation port.

[0032] In one embodiment, the housing includes a body and a radiation grid, the radiation grid is mounted on the body, and the heat radiation port is formed on the radiation grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A cross-sectional view of a cross section of an electric heater provided by an embodiment of the present invention;

[0034] Figure 2 for Figure 1 The partial structural diagram of the electric heater shown in ;

[0035] Figure 3 for Figure 1 Axonometric view of the electric heater shown in;

[0036] Figure 4 for Figure 1 A sectional view of another cross section of the electric heater shown in ;

[0037] Figure 5 for Figure 1 An exploded view of a portion of the structure of the electric heater shown in FIG.

[0038] Figure 6 for Figure 2 An enlarged view of point A of the electric heater shown in FIG.

[0039] Figure 7 for Figure 1 The partial structural diagram of the electric heater shown in ;

[0040] Figure 8 for Figure 4 An enlarged view of point B of the electric heater shown in FIG.

[0041] Fig. 9 for Figure 1 The structural diagram of the guide member of the electric heater shown in ;

[0042] Fig.10 for Figure 1 Flow vector diagram of hot air in the electric heater in the first working mode shown in ;

[0043] Fig.11 for Figure 1 FIG. 1 is a flow diagram of hot air of the electric heater in the second working mode.

[0044] 100. Electric heater; 10. Shell; 11. First air inlet; 111. First sub-air inlet; 112. Second sub-air inlet; 12. First air duct; 13. First air outlet; 14. Top surface; 15. Bottom surface; 161. First side surface; 17. Main body; 18. Radiation grille; 19. Air inlet grille; 110. Assembly cavity; 20. Heating element; 21. Heating plate; 30. Fan; 31. Casing; 311. First air inlet end; 312. First air outlet end; 32. Main body; 40. Guide member; 41. Second air inlet; 42. Second air outlet; 43. Second air duct; 431. Closed end; 432. Open end; 44. First end; 45. Second end; 46. First guide curved surface; 47. Second guide curved surface; 471. First sub-guide surface; 472. Second sub-guide surface. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0051] See also Figure 1 An embodiment of the present invention provides an electric heater 100, which is used to heat gas when powered on, and the heated gas flows into the room by convection to meet the heating needs of users. The electric heater 100 includes a housing 10 and a heating element 20, and the heating element 20 is arranged in the housing 10 to heat gas when powered on, and the heated gas flows into the room by convection to meet the heating needs of users.

[0052] The housing 10 is provided with a first air inlet 11 (see Figure 2 ) and the first air outlet 13 (see Figure 3 ), the housing 10 has a first air duct 12 connected between the first air inlet 11 and the first air outlet 13 (see Figure 4 ), the heating element 20 is disposed in the first air duct 12. In this way, the heating element 20 is connected to the outside through the first air inlet 11 and the first air outlet 13, and the outside air enters the first air duct 12 through the first air inlet 11 and exchanges heat with the heating element 20 and then flows out from the first air outlet 13.

[0053] Continue reading Figure 3The housing 10 has a top surface 14, a bottom surface 15, and a side surface (not shown) connected between the top surface 14 and the bottom surface 15. The first air inlet 11 is provided on the bottom surface 15 and / or the side surface of the housing 10, and the first air outlet 13 is provided on the top surface 14 of the housing 10. In this specific embodiment, the first air inlet 11 is provided on the bottom surface 15 and the side surface of the housing 10. Through the above arrangement, the external cold air enters the first air duct 12 from the first air inlet 11 located on the bottom surface 15 and the side surface of the housing 10, and after being heated by the heating element 20, it flows out from the first air outlet 13 located on the top surface 14 of the housing 10, which is convenient for the entry of cold air and the discharge of hot air.

[0054] The housing 10 is a hollow rectangular parallelepiped structure. In this case, the side surfaces of the housing 10 include first side surfaces 161 (see Figure 2 ), the second side surface (not marked in the figure), the third side surface (not marked in the figure) and the fourth side surface (not marked in the figure), the first side surface 161 is arranged opposite to the third side surface, and the second side surface is arranged opposite to the fourth side surface. Specifically, the area of ​​the first side surface 161 and the third side surface is greater than the area of ​​the second side surface and the fourth side surface, and the first air inlet 11 is opened on the bottom surface 15, the first side surface 161 and the third side surface.

[0055] Since one side of the housing 10 faces the human body in normal use, this side is defined as the front side, the side opposite to this side is defined as the rear side, and the other two sides are defined as the left side and the right side. The following is a detailed description using the first side 161 facing the human body as an example. In this case, the side of the housing 10 having the first side 161 is defined as the front side, the side having the third side is defined as the rear side, the side having the second side is defined as the left side, and the side having the fourth side is defined as the right side.

[0056] Continue reading Figure 2 Specifically, the first air inlet 11 includes a first sub-air inlet 111 and a second sub-air inlet 112. The first sub-air inlet 111 is opened on the bottom surface 15 of the housing 10, and the second sub-air inlet 112 is opened on the first side surface 161 and the third side surface of the housing 10. The heating element 20 is used for radiant heat transfer, and the second sub-air inlet 112 is also used as a heat radiation port. That is, the heating element 20 can use radiant heat transfer and convection heat transfer at the same time, and radiates heat to the outside through the second sub-air inlet 112 (the air inlet can take in air and radiate heat to the outside), directly transferring the radiated heat to the human body, and quickly raising the human body temperature.

[0057] Furthermore, the heating element 20 can be one of mica electric heating film, silicon crystal electric heating film, carbon crystal heating plate and high emissivity coated aluminum alloy heating plate. The surface of the heating element 20 is made of high emissivity material, and the surface emissivity is ≥0.8. The higher the surface emissivity of the heating element 20, the more far-infrared heat radiated outward through the second sub-air inlet 112. The far-infrared heat can be directly transferred to human clothing or the human body, quickly increasing the surface temperature of human clothing or the human body, improving the far-infrared heating effect, and the far-infrared radiation can promote human blood circulation, which is beneficial to human health.

[0058] See also Figure 5 , the heating element 20 includes a plurality of heating plates 21, the plurality of heating plates 21 are parallel to each other, and the inclination angle a of the plurality of heating plates 21 with respect to the length direction of the housing 10 is 0°-45°. It should be understood that in other embodiments, the arrangement of the heating element 20 is not limited thereto, such as the heating element 20 may include a single heating plate 21, or the heating element 20 includes a plurality of heating plates 21, and the inclination angles a of the plurality of heating plates 21 with respect to the length direction of the housing 10 are different.

[0059] Continue reading Figure 2 and Figure 3 In one embodiment, the housing 10 includes a body 17 and a radiation grid 18, the radiation grid 18 is mounted on the body 17, and the heat radiation port is formed on the radiation grid 18. The opening shape of the radiation grid 18 can be circular, square, diamond or track-shaped. Since the higher the opening rate of the radiation grid 18, the more far-infrared heat radiated outward by the heating element 20, and the better the human body heating effect, the opening rate of the radiation grid 18 can be set to be ≥50%.

[0060] Continue reading Figure 2 The electric heater 100 also includes a fan 30 and a guide member 40, both of which are mounted on the housing 10. The fan 30 is connected to the guide member 40 to blow air to the guide member 40. The airflow blown to the guide member 40 is guided by the guide member 40 and drives the hot air flowing out of the first air outlet 13 to be blown out from the side of the housing 10.

[0061] The electric heater 100 provided in this embodiment, under the action of the fan 30 and the guide member 40, causes the hot air flowing out of the first air outlet 13 to be blown out from the side of the outer shell 10, and the blown hot air floats up after flowing along the lateral direction of the outer shell 10 for a certain distance, thereby avoiding the hot air being directly discharged from the first air outlet 13 located on the top surface 14 of the outer shell 10 and then floating up, thereby improving the heat transfer rate in the personnel activity area, and further improving the heat utilization rate and human comfort.

[0062] In one embodiment, the electric heater 100 has a first working mode and a second working mode. In the first working mode, the heating element 20 is turned on and the fan 30 is turned off; in the second working mode, the heating element 20 is turned on and the fan 30 is turned on. By setting the electric heater 100 with the first working mode and the second working mode, different needs of users can be met.

[0063] When the user needs to sleep, in order to reduce the noise generated by the fan 30, the first working mode of the electric heater 100 can be turned on, and the hot air generated by the electric heater 100 is directly discharged from the first air outlet 13; when the user needs to heat up quickly, the second working mode of the electric heater 100 can be turned on, and the fan 30 works, and the air flow is blown by the flow guide 40 to drive the hot air flowing out of the first air outlet 13 to be blown out from the side of the outer shell 10, which can quickly increase the temperature of the human body activity area and improve the utilization rate of heat.

[0064] The electric heater 100 further includes a controller (not shown), and the heating element 20 and the fan 30 are both electrically connected to the controller, and the controller controls the coordinated operation of the heating element 20 and the fan 30 .

[0065] In one embodiment, the fan 30 is connected to the outside, and is used to inhale the outside airflow and blow the outside airflow to the air guide 40. The airflow blown to the air guide 40 drives the hot air flowing out of the first air outlet 13 to be blown out from the side of the housing 10 after being guided by the air guide 40. In this way, the outside airflow is mixed with the hot air flowing out of the first air outlet 13 and then blown out from the side of the housing 10. The temperature of the gas blown out from the side of the housing 10 is slightly lower than that of the hot air directly flowing out of the first air outlet 13, thereby achieving the effect of lowering the temperature of the gas blown out from the heater and ensuring the comfort of the human body.

[0066] It should be understood that in other embodiments, the fan 30 may also directly inhale the hot air exhausted from the electric heater 100 and blow the hot air to the guide member 40, and the airflow blown to the guide member 40 drives the hot air flowing out of the first air outlet 13 to be blown out from the side of the housing 10 after being guided by the guide member 40. In other embodiments, the fan 30 may also simultaneously inhale a mixed gas of the outside gas and the hot air exhausted from the electric heater 100, and blow the mixed gas to the guide member 40, and the airflow blown to the guide member 40 drives the hot air flowing out of the first air outlet 13 to be blown out from the side of the housing 10 after being guided by the guide member 40, which is not limited here.

[0067] Continue reading Figure 2In one embodiment, the housing 10 further has an assembly cavity 110, which is opened on the second side or the fourth side of the housing 10, and the fan 30 is assembled in the assembly cavity 110. It can be understood that in other embodiments, the housing 10 can also omit the assembly cavity 110, which is not limited here.

[0068] Furthermore, in order to ensure that the air sucked by the fan 30 is all external air, the assembly cavity 110 and the first air duct 12 are not connected to each other.

[0069] Continue reading Figure 3 Furthermore, the housing 10 includes a body 17 and an air inlet grille 19. The air inlet grille 19 is mounted on the body 17 and defines the above-mentioned mounting cavity 110 with the body 17. The fan 30 is connected to the outside through the air inlet grille 19. It can be understood that in other embodiments, the air inlet grille 19 can be omitted, and the fan 30 is directly connected to the outside, which is not limited here.

[0070] The opening shape of the air inlet grille 19 can be circular, square, diamond or runway, which is not limited here. The larger the opening rate of the grille, the smaller the air inlet resistance, and the larger the air volume of the fan 30. In order to ensure the air volume of the fan 30, the opening rate of the air inlet grille 19 is set to be ≥50%.

[0071] The fan 30 inhales external air from the air inlet grille 19 and blows the external air to the guide member 40 . The air blown to the guide member 40 is guided by the guide member 40 and drives the hot air flowing out of the first air outlet 13 to be blown out from the front side of the housing 10 .

[0072] See also Figure 6 In one embodiment, the guide member 40 is provided with a second air inlet 41 and a second air outlet 42, and the guide member 40 has a second air duct 43 connecting the second air inlet 41 and the second air outlet 42. The second air inlet 41 is connected to the fan 30, and the second air outlet 42 is connected to the first air outlet 13. The fan 30 inhales external air from the air inlet grille 19 and blows the external air from the second air inlet 41 into the second air duct 43 of the guide member 40, and flows from the second air duct 43 to the second air outlet 42 and blows out. The gas blown out from the second air outlet 42 drives the hot air flowing out from the first air outlet 13 to be blown out from the front side of the housing 10.

[0073] It should be understood that in other embodiments, the guide member 40 may also be arranged in other ways. For example, the guide member 40 omits the second air inlet 41, the second air outlet 42 and the second air duct 43, and is instead arranged as an arc-shaped guide plate or a straight-line guide plate structure, which is not limited here.

[0074] Continue reading Figure 2The fan 30 includes a casing 31 and a body 32. The body 32 is disposed in the casing 31. The casing 31 has a first air inlet end 311 and a first air outlet end 312 connected to each other (see Figure 7 ), the first air outlet end 312 is connected to the guide member 40, so that the body 32 is connected to the second air inlet 41 of the guide member 40. Specifically, the fan 30 can be a centrifugal fan, a mixed flow fan, a turbine fan or an axial flow fan, as long as it can blow air to the guide member 40, and it is not limited here.

[0075] Furthermore, the length of the air guide 40 is arranged to span the entire first air duct 12 , that is, along the line connecting the left side and the right side of the housing 10 , the length of the air guide 40 is equal to the length of the first air duct 12 .

[0076] Specifically, the guide member 40 is connected to the body 17 of the housing 10 to form the second air duct 43, that is, part of the air duct wall of the second air duct 43 is formed on the housing 10. It should be understood that in other embodiments, all the air duct walls of the second air duct 43 are formed on the guide member 40, which is not limited here.

[0077] See also Figure 8 and Fig. 9 The guide member 40 is a plate-shaped structure, and has a first end 44 and a second end 45 connected to each other. The second end 45 extends toward the first end 44 and partially overlaps the inner side of the first end 44. The second air inlet 41 is formed at one end of the guide member 40 close to the fan 30. The first end 44 and the second end 45 are arranged to form a second air duct 43. The second air outlet 42 is formed between the part of the second end 45 overlapping the inner side of the first end 44 and the first end 44.

[0078] Furthermore, the guide member 40 passes through along the line connecting the left side and the right side of the outer shell 10. At this time, the first end 44, the second end 45 and the outer shell 10 of the guide member 40 are surrounded to form a second air duct 43, and the second end 45 overlaps with the inner part of the first end 44, the first end 44 and the outer shell 10 to form a second air outlet 42.

[0079] It is understandable that in other embodiments, the guide member 40 may be arranged to be non-through along the direction of the line connecting the left side and the right side of the outer shell 10, and the first end 44 and the second end 45 are directly arranged to form a second air duct 43, and the second end 45 overlaps the inner part of the first end 44 and directly forms a second air outlet 42 between the first end 44, which is not limited here.

[0080] It can also be understood that the formation of the second air inlet 41, the second air outlet 42 and the second air duct 43 is not limited to this. For example, the guide member 40 can be set as a block structure, and the second air inlet 41, the second air outlet 42 and the second air duct 43 are all directly opened on the guide member 40, which is not limited here.

[0081] Continue reading Figure 8 In one embodiment, the second air duct 43 has a closed end 431 and an open end 432 that are connected to each other, the open end 432 is connected to the second air outlet 42, and the closed end 431 is arranged away from the second air outlet 42 relative to the open end 432. The cross-sectional area of ​​the open end 432 is larger than the cross-sectional area of ​​the closed end 431, so that when the airflow flows to the open end 432, the cross-sectional area of ​​the open end 432 is larger, so the uniformity of the airflow can be increased.

[0082] The difference between the cross-sectional area of ​​the opening end 432 and the cross-sectional area of ​​the second air outlet 42 is greater than a first preset threshold value, so that the flow rate of the airflow blown out from the second air outlet 42 is greater than the second preset threshold value to form a negative pressure outside the guide member 40, and the hot air flowing out of the first air outlet 13 is sucked toward the airflow flowing out of the second air outlet 42 under the action of the negative pressure, and is discharged from the front side of the outer shell 10 together with the airflow flowing out of the second air outlet 42.

[0083] Specifically, the cross-sectional area of ​​the second air outlet 42 gradually decreases from one end close to the opening end 432 to the end away from the opening end 432 to further increase the flow rate of the air flow flowing out of the second air outlet 42 and form a larger negative pressure to facilitate the inhalation of the hot air flowing out of the first air outlet 13.

[0084] In a specific embodiment, the width of the second air outlet 42 is 0.8 mm-2 mm. If the direction from the left side to the right side of the housing 10 is defined as the first direction, in the first direction, the length of the second air outlet 42 is equal to that of the second air duct 43, and the size of the second air outlet 42 along the second direction perpendicular to the first direction is 0.8 mm-2 mm. It can be understood that in other embodiments, the width of the second air outlet 42 is not limited.

[0085] See also Fig. 9 A first guide curved surface 46 is formed on the inner side of the second end 45 of the guide member 40 . The first guide curved surface 46 is adjacent to the second air outlet 42 and is used to guide the airflow in the second air duct 43 to be discharged to the second air outlet 42 .

[0086] Continue reading Figure 4 Further, the air outlet direction of the second air outlet 42 is set toward the first air outlet 13, and the air outlet axis of the second air outlet 42 is set obliquely to the air outlet axis of the first air outlet 13. It should be understood that in other embodiments, the air outlet axis of the second air outlet 42 can also be set perpendicular to the air outlet axis of the first air outlet 13, which is not limited here.

[0087] Continue reading Figure 8 and Fig. 9In one embodiment, a second guide curved surface 47 is formed on the outside of the guide member 40 on a side facing the first air outlet 13. The second guide curved surface 47 includes a first sub-guide surface 471 and a second sub-guide surface 472 that are connected to each other. The first sub-guide surface 471 is adjacent to the second air outlet 42. The first sub-guide surface 471 is inclined relative to the second air outlet 42 toward a side away from the first air outlet 13. An end of the second sub-guide surface 472 away from the first sub-guide surface 471 is parallel to the horizontal direction.

[0088] Through the above arrangement, the airflow ejected from the second air outlet 42 can form a negative pressure to absorb the hot air flowing out of the first air outlet 13. Under the Coanda effect (the fluid has a tendency to deviate from the original flow direction and flow along the protruding surface of the object. When there is surface friction between the fluid and the surface of the object it flows through (it can also be said to be fluid viscosity), as long as the curvature is not large, the fluid will flow along the surface of the object.), it will flow along the first sub-guiding surface 471 to the second sub-guiding surface 472, and flow out from the second sub-guiding surface 472. The airflow is relatively stable; and because the airflow velocity is large, the flow distance of the airflow along the side of the shell 10 is increased. And because the end of the second sub-guiding surface 472 away from the first sub-guiding surface 471 is parallel to the horizontal direction, it is ensured that the airflow is discharged from the front side of the shell 10 in the horizontal direction. Compared with the case of discharge in other directions, the airflow discharged in the horizontal direction flows a longer distance in the horizontal direction, further improving the utilization rate of heat.

[0089] The working principle of the electric heater 100 provided in the embodiment of the present invention is as follows:

[0090] In the first working mode:

[0091] When the electric heater 100 is turned on and powered on, the heating element 20 generates heat, and the heating element 20 can radiate heat outward from the second sub-inlet 112. At the same time, the indoor air flows into the electric heater 100 from the first sub-inlet 111 and the second sub-inlet 112, and heat exchanges with the heating element 20 to form hot air that flows out from the first outlet 13. After the hot air flows out from the first outlet 13, it flows above the electric heater 100 under the action of buoyancy, and at the same time draws in the surrounding air for heat diffusion. After the hot air flows to the top of the room, it flows and diffuses around the room, and then flows back to the lower part of the room to heat the entire indoor space during sleep.

[0092] In the second working mode:

[0093] The electric heater 100 is turned on, the heating element 20 generates heat, the fan 30 is turned on, and the heating element 20 can radiate heat outward from the second sub-inlet 112. Indoor air flows into the electric heater 100 from the first sub-inlet 111 and the second sub-inlet 112, and heat exchanges with the heating element 20 to form hot air that flows out from the first outlet 13. At the same time, the fan 30 inhales indoor air from the air inlet grille 19, and blows the indoor air from the second inlet 41 of the guide member 40 into the second air duct 43 of the guide member 40, and ejects it from the second outlet 42 of the guide member 40 at a high speed under the wind pressure of the fan 30. The ejection speed is fast, forming a negative pressure, and under the action of the second guide curved surface 47, a greater negative pressure is generated. Under the action of the above negative pressure, the hot air discharged from the first outlet 13 is sucked into the airflow discharged from the second outlet 42, and the two airflows meet and then directly enter the activity area of ​​​​the personnel under the action of the second sub-guide surface 472. The intersection of the two air flows not only increases the flow rate, which quickly heats up the area where people are active, but also increases the air supply distance, thereby improving the utilization rate of heat and enhancing human comfort.

[0094] See also Fig.10 and Fig.11 Compared with the first working mode, in the second working mode, the distance that the hot air flows to the front side of the housing 10 is longer, and the heating range of the front side of the electric heater 100 is larger. For example, at a distance of 0.8m from the front side of the electric heater 100 and 0.8m above the ground, the temperature in the second working mode is 21.9°C, and the temperature in the first working mode is 17.5°C. At a distance of 1.2m from the front side of the electric heater 100 and 0.8m above the ground, the temperature in the second working mode is 17.3°C, and the temperature in the first working mode is 17.1°C.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electric heater, characterized in that: include: A housing (10), wherein a first air inlet (11) and a first air outlet (13) are provided on the housing (10), the housing (10) has a first air duct (12) connected between the first air inlet (11) and the first air outlet (13), the housing (10) has a top surface (14), and the first air outlet (13) is provided on the top surface (14); a heating element (20) mounted in the first air duct (12), the heating element (20) being used to heat the gas entering the first air duct (12) from the first air inlet (11) when powered on; as well as a fan (30) and a flow guide (40) both mounted on the housing (10); the fan (30) being in communication with the flow guide (40) and being used to blow air toward the flow guide (40) so as to drive hot air flowing out of the first air outlet (13) to be blown out from a side of the housing (10); and the fan (30) being in communication with the outside and being used to inhale outside air flow and blow the outside air flow toward the flow guide (40); The guide member (40) is provided with a second air inlet (41) and a second air outlet (42), and a second air duct (43) communicating with the second air inlet (41) and the second air outlet (42) is formed in the guide member (40); the second air inlet (41) is communicated with the fan (30), and the second air outlet (42) is communicated with the first air outlet (13), and the airflow blown out from the second air outlet (42) drives the hot air flowing out from the first air outlet (13) to be blown out from the side of the housing (10); the second air duct (43) has a closed end (431) and an open end (432) that are communicated with each other, the open end (432) is communicated with the second air outlet (42), and the closed end (431) is arranged away from the second air outlet (42) relative to the open end (432); The difference between the cross-sectional area of ​​the opening end (432) and the cross-sectional area of ​​the second air outlet (42) is greater than a first preset threshold value, so that the flow rate of the airflow blown out from the second air outlet (42) is greater than the second preset threshold value to form a negative pressure outside the guide member (40).

2. The electric heater according to claim 1, characterized in that: The housing (10) further comprises an assembly cavity (110), and the fan (30) is assembled in the assembly cavity (110).

3. The electric heater according to claim 2, characterized in that: The housing (10) comprises a body (17) and an air inlet grille (19); the air inlet grille (19) is mounted on the body (17) and defines the mounting cavity (110) with the body (17); the fan (30) is connected to the outside through the air inlet grille (19); the fan (30) is used to inhale external airflow and blow the external airflow toward the guide member (40).

4. The electric heater according to claim 2, characterized in that: The assembly cavity (110) and the first air duct (12) are not connected to each other.

5. The electric heater according to claim 1, characterized in that: The guide member (40) is a plate-shaped structure, and comprises a first end (44) and a second end (45) connected to each other, wherein the second end (45) extends toward the first end (44) and partially overlaps the inner side of the first end (44); The second air inlet (41) is formed at one end of the air guide member (40) close to the fan (30), the first end (44) and the second end (45) are arranged to form the second air duct (43), and the second end (45) overlaps the inner side of the first end (44) to form the second air outlet (42) between the first end (44).

6. The electric heater according to claim 5, characterized in that: A first flow guiding curved surface (46) is formed on the inner side of the second end (45), and the first flow guiding curved surface (46) is adjacent to the second air outlet (42) and is used to guide the airflow in the second air duct (43) to be discharged to the second air outlet (42).

7. The electric heater according to claim 1, characterized in that: The cross-sectional area of ​​the second air outlet (42) gradually decreases from an end close to the opening end (432) to an end far from the opening end (432).

8. The electric heater according to claim 1, characterized in that: A second flow-guiding curved surface (47) is formed on the outside of the flow-guiding member (40) on a side facing the first air outlet (13); the second flow-guiding curved surface (47) comprises a first sub-flow-guiding surface (471) and a second sub-flow-guiding surface (472) which are connected to each other; the first sub-flow-guiding surface (471) is adjacent to the second air outlet (42); the first sub-flow-guiding surface (471) is inclined relative to the second air outlet (42) toward a side away from the first air outlet (13); and an end of the second sub-flow-guiding surface (472) away from the first sub-flow-guiding surface (471) is parallel to the horizontal direction.

9. The electric heater according to claim 1, characterized in that: The air outlet direction of the second air outlet (42) is arranged towards the first air outlet (13), and the air outlet axis of the second air outlet (42) is arranged obliquely to the air outlet axis of the first air outlet (13).

10. The electric heater according to claim 1, characterized in that: The second air duct (43) has a closed end (431) and an open end (432) which are connected to each other, the open end (432) is connected to the second air outlet (42), and the closed end (431) is arranged away from the second air outlet (42) relative to the open end (432); Wherein, the cross-sectional area of ​​the open end (432) is greater than the cross-sectional area of ​​the closed end (431).

11. The electric heater according to claim 1, characterized in that: The electric heater has a first working mode and a second working mode; Wherein, in the first working mode, the heating element (20) is turned on and the fan (30) is turned off; in the second working mode, the heating element (20) is turned on and the fan (30) is turned on.

12. The electric heater according to claim 1, characterized in that: The housing (10) further comprises a bottom surface (15) and a side surface connected between the top surface (14) and the bottom surface (15), and the first air inlet (11) is opened on the bottom surface (15) and / or the side surface.

13. The electric heater according to claim 12, characterized in that: The first air inlet (11) comprises a first sub-air inlet (111) and a second sub-air inlet (112), the first sub-air inlet (111) being opened on the bottom surface (15), and the second sub-air inlet (112) being opened on the side surface; The heating element (20) is used for radiant heat transfer, and the second sub-air inlet (112) is also used as a heat radiation port.

14. The electric heater according to claim 13, characterized in that: The housing (10) comprises a body (17) and a radiation grid (18); the radiation grid (18) is mounted on the body (17); and the heat radiation port is formed on the radiation grid (18).

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