Electric heater

Abstract

The utility model discloses an electric heater which comprises an electric heater body and a direct current fan, and the direct current fan is installed on the electric heater body. The direct-current fan comprises a direct-current motor and fan blades which are electrically connected with the electric heater body, and the fan blades are detachably installed on the direct-current motor. According to the electric heater, the fan blades are detachably installed on the direct-current motor, the air volume can be increased to adapt to higher power output of the electric heater, and the fan blades are convenient to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, in particular to an electric heater. Background Art

[0002] Traditional electric heaters use AC motors to drive fan blades to dissipate heat from the heating element to achieve the purpose of blowing out hot air. Figure 1 As shown, there are some electric heaters on the market that use DC motors to drive fan blades. They generally use square-shaped DC fans to blow air and dissipate heat. However, it is difficult for the current square-shaped DC fans to achieve a relatively high wind speed and ventilation volume, and they are even lower than the wind speed and ventilation volume of the traditional AC motor-driven fan blades, so the power that the product can achieve is lower than the traditional one.

[0003] For electric heaters, the greater the ventilation volume, the greater the power can be. If the ventilation volume is not enough, forcing the power to be increased will cause safety risks and fail to meet safety standards. The greater the power of the electric heater, the better the heating effect when heating is required. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an electric heater.

[0005] The technical solution adopted by the utility model to solve the technical problem is: an electric heater, comprising an electric heater body and a DC fan, wherein the DC fan is installed on the electric heater body;

[0006] The DC fan comprises a DC motor and fan blades which are electrically connected to the electric heater body, and the fan blades are detachably mounted on the DC motor.

[0007] In some embodiments, the DC fan further includes a fixing cover, and the fan blades are detachably connected to the rotor end of the DC motor through the fixing cover.

[0008] In some embodiments, the DC motor comprises an outer rotor, an inner stator assembly, a rotor shell and a base, wherein the inner stator assembly is fixedly mounted on the base, and the outer rotor is sleeved outside the inner stator assembly; the rotor shell is fixedly sleeved on the outer rotor and rotates with the outer rotor, and is rotatably connected to the base through a rotating shaft;

[0009] The fan blade is detachably connected to the end of the rotor shell through the fixing cover.

[0010] In some embodiments, the rotor shell includes an annular side wall, an end wall and a protruding shaft, wherein the end wall is connected to one end of the annular side wall, and the protruding shaft is connected to the center of the end wall and extends along the axial direction of the annular side wall;

[0011] The extending shaft passes through the fan blades, extends into the interior of the fixing cover, and is detachably connected to the fixing cover.

[0012] In some embodiments, the fixed cover includes a cover body and a fixed cap, wherein the fixed cap is disposed in the middle of the cover body and protrudes along the outside of the cover body;

[0013] The fixing cap is provided with an inner groove and is sleeved or screwed with the extending shaft.

[0014] In some embodiments, the inner groove of the fixing cap is provided with an internal thread, the extending shaft is provided with an external thread, and the fixing cap is screwed and fixed to the extending shaft;

[0015] or

[0016] The extending shaft is provided with a first connecting hole, and the fixing cap is provided with a first through hole. The first through hole and the first connecting hole are connected and fixed by a fastener.

[0017] In some embodiments, the rotor housing further comprises a plurality of positioning posts, which are disposed around the outer periphery of the extended shaft and fixedly connected to the end wall;

[0018] The positioning post passes through the fan blade and the fixing cover to achieve positioning, or the positioning post passes through the fan blade and the fixing cover and is detachably connected to the fan blade and the fixing cover through fasteners.

[0019] In some embodiments, the rotor shell further includes a plurality of reinforcing ribs, wherein the reinforcing ribs are fixedly connected to the end wall and are respectively connected to the extending shaft and the positioning column.

[0020] In some embodiments, the reinforcing ribs include an inner ring convex rib, an outer ring convex rib and a plurality of intermediate connecting ribs, the inner ring convex rib is arranged outside the protruding shaft, the outer ring convex rib is arranged outside the inner ring convex rib, and each of the intermediate connecting ribs sequentially connects the protruding shaft, the positioning column and the outer ring convex rib.

[0021] In some embodiments, the base includes a bottom and an intermediate connecting shaft, the intermediate connecting shaft is rotatably connected to the bottom, and the intermediate connecting shaft is fixedly connected to the extending shaft.

[0022] By implementing the utility model, the following beneficial effects are achieved:

[0023] The utility model electric heater has the fan blades detachably mounted on the DC motor, which can not only increase the air volume to adapt to the higher power output of the electric heater, but also facilitate the replacement of the fan blades. DC Motor The speed can be easily adjusted through the control circuit, so that the electric heater can use a higher speed in the high power gear and a lower speed in the low power gear, so as to achieve the purpose of low-speed silent heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0025] Figure 1 It is a cross-sectional view of a square-shaped DC fan of a conventional electric heater;

[0026] Figure 2 It is a schematic diagram of an explosion of an electric heater according to the first embodiment of the utility model;

[0027] Figure 3 yes Figure 2 Exploded diagram of the DC motor;

[0028] Figure 4 yes Figure 2 A schematic diagram of the structure of the middle fixed cover;

[0029] Figure 5 yes Figure 2 Schematic diagram of the structure of the middle fan blade. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a chemical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] like Figure 1 The figure shows a cross-sectional view of a conventional electric heater's square-shaped DC fan, wherein the DC fan's blades are fixedly connected to the DC motor and cannot be disassembled, and the blades are connected to the inner rotor of the blades. As a result, the wind speed and ventilation volume of the DC fan are lower than those of the conventional AC motor driving the fan blades, and the power that can be achieved is also lower than that of the conventional one. The electric heater of the present utility model can solve the above problems. The following are several implementation methods of the electric heater of the present utility model:

[0035] Embodiment 1:

[0036] See also Figures 2 to 5 Embodiment 1 of the utility model discloses an electric heater, including an electric heater body and a DC fan, wherein the DC fan is mounted on the electric heater body. The DC fan includes a DC motor 3 and a fan blade 4 electrically connected to the electric heater body, wherein the fan blade 4 is detachably mounted on the DC motor 3. The electric heater body includes a housing 1, a heating element 2 and a control circuit, wherein the heating element 2 is mounted on the housing 1 and electrically connected to the control circuit, and the DC motor 3 is fixedly mounted inside the housing 1 and electrically connected to the control circuit. The housing 1 is a hollow structure with ventilation at both ends, which is convenient for ventilation of the DC fan.

[0037] It can be understood that the control circuit avoids the heating element 2 and the DC motor 3 and is installed inside the housing 1 to prevent hot melting. The heating element 2 is installed on the back of the fan blade 4, and the heat is taken out by blowing air through the fan blade 4 to form hot air. Compared with the related art, the utility model can utilize the energy-saving advantages and speed regulation advantages of the DC motor 3, and the fan blade 4 can be detachably connected to the DC motor 3, so that the wind speed and air volume of the fan blade installed by the AC motor can be achieved, which is suitable for the high-power output of the electric heater and is also convenient for replacing the fan blade. In addition, the fan blade 4 can be easily regulated by the control circuit, so that the electric heater can use high speed in high power gear and low speed in low power gear to achieve the purpose of low-speed silent heating. Among them, the housing 1, the heating element 2 and the control circuit are prior art, which will not be repeated here, and are not shown in the control circuit diagram. The housing 1 and the heating element 2 in the figure are only an example, and the utility model does not limit their structure and shape.

[0038] Furthermore, the DC fan also includes a fixing cover 5 , through which the fan blades 4 are detachably connected to the rotor end of the DC motor 3 and are arranged opposite to the heating element 2 .

[0039] Furthermore, if Figure 3 As shown, the DC motor 3 includes an outer rotor 31, an inner stator assembly 32, a rotor shell 33 and a base 34. The inner stator assembly 32 is fixedly mounted on the base 34, and the outer rotor 31 is sleeved outside the inner stator assembly 32. The rotor shell 33 is fixedly sleeved on the outer rotor 31 and rotates with the outer rotor 31, and is rotatably connected to the base 34 through a rotating shaft. The fan blades 4 are detachably connected to the ends of the rotor shell 33 through a fixed cover 5. It can be understood that the rotation of the outer rotor 31 drives the rotor shell 33 to rotate, and the rotation of the rotor shell 33 drives the fan blades 4 to rotate, and the fixed cover 5 prevents the fan blades 4 from detaching from the outer rotor 31 under high-speed rotation.

[0040] Further, the rotor housing 33 includes an annular side wall 331, an end wall 332 and a protruding shaft 333. The end wall 332 is connected to one end of the annular side wall 331, and the protruding shaft 333 is connected to the center of the end wall 332 and extends along the axial direction of the annular side wall 331. The protruding shaft 333 passes through the fan blade 4 and extends into the interior of the fixed cover 5 and is detachably connected to the fixed cover 5. It can be understood that the outer rotor 31 is fixedly connected to the annular side wall 331 and the end wall 332, and can also be connected to the annular side wall 331 separately. The fan blade 4 is provided with a through hole 41 (such as Figure 4 As shown), the through hole 41 is sleeve-connected and fixed with the extending shaft 333, or can be screwed and fixed.

[0041] Furthermore, if Figure 5 As shown, the fixed cover 5 includes a cover body 51 and a fixed cap 52. The fixed cap 52 is arranged in the middle of the cover body 51 and protrudes along the outside of the cover body 51. The fixed cap 52 is provided with an inner groove and is detachably sleeved with the extended shaft 333.

[0042] Preferably, in order to realize the detachable sleeve connection between the fixing cap 52 and the extension shaft 333, the extension shaft 333 is provided with a first connecting hole 334, the fixing cap 52 is provided with a first through hole 53, and the first through hole 53 is connected and fixed to the first connecting hole 334 by a fastener. The fixing cap 5 is prevented from axially moving along the extension shaft 333, thereby limiting the axial movement of the fan blade 4. It can be understood that the first connecting hole 334 can be provided at the end or side of the first connecting hole 334, and similarly, the first through hole 53 can be provided at the end or side of the first connecting hole 334.

[0043] Furthermore, the rotor housing 33 further includes a plurality of positioning posts 335, which are arranged around the outer periphery of the extended shaft 333 and fixedly connected to the end wall 332. The positioning posts 335 pass through the fan blades 4 and the fixed cover 5 to achieve positioning. It can be understood that in some other embodiments, the positioning posts 335 pass through the fan blades 4 and the fixed cover 5 and are detachably connected to the fan blades 4 and the fixed cover 5 through fasteners, which can strengthen the connection between the fan blades 4 and the fixed cover 5 and the rotor housing 33.

[0044] Preferably, the fixing cover 5 is further provided with the same number of first positioning holes 54 as the positioning posts 335, and the fan blade 4 is further provided with the same number of second positioning holes 42 as the positioning posts 335 (eg, Figure 4 As shown in FIG. 3 , the second positioning hole 42 and the first positioning hole 54 are sequentially sleeved on the positioning column 335. The positioning column 335 can achieve a positioning function and prevent radial relative rotation between the fan blade 4 and the fixed cover 5 and the extension shaft 333. These positioning columns 335 can also be positioning ribs, convex points and other features to prevent rotation.

[0045] Furthermore, the rotor housing 33 further includes a plurality of reinforcing ribs, which are fixedly connected to the end wall 332 and respectively connected to the extension shaft 333 and the positioning column 335, so as to enhance the stability of the extension shaft 333 and the positioning column 335 and prevent deformation or breakage.

[0046] Further, the reinforcing ribs include an inner ring convex rib 336, an outer ring convex rib 337 and a plurality of intermediate connecting ribs 338, the inner ring convex rib 336 is arranged outside the extension shaft 333, the outer ring convex rib 337 is arranged outside the inner ring convex rib 336, and each intermediate connecting rib 338 sequentially connects the extension shaft 333, the positioning column 335 and the outer ring convex rib 337. It can be understood that the reinforcing ribs are used to strengthen the connection between the extension shaft 333 and the positioning column 335 and the end wall 332 and to evenly and disperse the force. The reinforcing ribs can be arranged in various ways, and the inner ring convex rib 336, the outer ring convex rib 337 and the plurality of intermediate connecting ribs 338 are only an example. The utility model does not limit the structure of the reinforcing ribs.

[0047] Further, the base 34 includes a bottom 341 and an intermediate connecting shaft 342, the intermediate connecting shaft 342 is rotatably connected to the bottom 341, and the intermediate connecting shaft 342 is fixedly connected to the extension shaft 333. The intermediate connecting shaft 342 needs to pass through the middle of the inner stator assembly 32 and leave a gap between the inner stator assembly 32. Preferably, the extension shaft 333 is also provided with an inner groove to be sleeved with the intermediate connecting shaft 342. When the rotor housing rotates, the intermediate connecting shaft 342 can limit the movement of the rotor housing along its axial direction.

[0048] Furthermore, the fan blade 4 is an integrated structure made of plastic material or metal material. The fan blade 4 is a fan blade 4 made of plastic material, or the fan blade 4 is a fan blade 4 made of metal material.

[0049] Embodiment 2:

[0050] Embodiment 2 of the present utility model discloses an electric heater, including an electric heater body and a DC fan, wherein the DC fan is mounted on the electric heater body. The DC fan includes a DC motor 3 and a fan blade 4 electrically connected to the electric heater body, wherein the fan blade 4 is detachably mounted on the DC motor. The electric heater body includes a housing 1, a heating element 2 and a control circuit, wherein the heating element 2 is mounted on the housing 1 and electrically connected to the control circuit, and the DC motor 3 is fixedly mounted inside the housing 1 and electrically connected to the control circuit. The housing 1 is a hollow structure with ventilation at both ends, which is convenient for ventilation of the DC fan.

[0051] Furthermore, the DC fan also includes a fixing cover 5 , through which the fan blades 4 are detachably connected to the rotor end of the DC motor 3 and are arranged opposite to the heating element 2 .

[0052] The fixing cover 5 includes a cover body 51 and a fixing cap 52, wherein the fixing cap 52 is arranged in the middle of the cover body 51 and protrudes along the outside of the cover body 51. The fixing cap 52 is provided with an inner groove and is screwed with the extension shaft 333, and the fixing between the fixing cap 52 and the extension shaft 333 can be achieved without the aid of fasteners. Preferably, the inner groove of the fixing cap 52 is provided with an internal thread, the extension shaft 333 is provided with an external thread, and the fixing cap 52 is screwed and fixed with the extension shaft 333. Among them, this embodiment is not shown in the figure, and the other structures of the electric heater are the same as those in the first embodiment, and are not described here.

[0053] Embodiment three:

[0054] Embodiment 3 of the present utility model discloses an electric heater, including an electric heater body and a DC fan, wherein the DC fan is mounted on the electric heater body. The DC fan includes a DC motor 3 and a fan blade 4 electrically connected to the electric heater body, wherein the fan blade 4 is detachably mounted on the DC motor. The electric heater body includes a housing 1, a heating element 2 and a control circuit, wherein the heating element 2 is mounted on the housing 1 and electrically connected to the control circuit, and the DC motor 3 is fixedly mounted inside the housing 1 and electrically connected to the control circuit. The housing 1 is a hollow structure with ventilation at both ends, which is convenient for ventilation of the DC fan.

[0055] Furthermore, the fan blade 4 is detachably locked to the DC motor 3 by fasteners. Specifically, the rotor housing 33 further includes a plurality of positioning posts 335, which are arranged around the outer periphery of the extended shaft 333 and fixedly connected to the end wall 332. The positioning posts pass through the fan blade 4 and are detachably connected to the fan blade 4 by fasteners, without the need for fixing the fixing cover 5. Among them, this embodiment is not shown in the figure, and the other structures of the electric heater are the same as those in the first embodiment, and are not described here.

[0056] By implementing the utility model, the following beneficial effects are achieved:

[0057] The electric heater of the utility model has the fan blade 4 detachably mounted on the DC motor 3, which can not only increase the air volume to adapt to the higher power output of the electric heater, but also facilitate the replacement of the fan blade. DC Motor The speed can be easily adjusted through the control circuit, so that the electric heater can use a higher speed in the high power gear and a lower speed in the low power gear, so as to achieve the purpose of low-speed silent heating.

[0058] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the utility model; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. An electric heater, characterized in that: It comprises an electric heater body and a DC fan, wherein the DC fan is mounted on the electric heater body; The DC fan comprises a DC motor (3) electrically connected to the electric heater body and fan blades (4); the fan blades (4) are detachably mounted on the DC motor (3).

2. The electric heater according to claim 1, characterized in that: The DC fan also includes a fixing cover (5), and the fan blades (4) are detachably connected to the rotor end of the DC motor (3) via the fixing cover (5).

3. The electric heater according to claim 2, characterized in that: The DC motor (3) comprises an outer rotor (31), an inner stator assembly (32), a rotor shell (33) and a base (34); the inner stator assembly (32) is fixedly mounted on the base (34), and the outer rotor (31) is sleeved outside the inner stator assembly (32); the rotor shell (33) is fixedly sleeved on the outer rotor (31) to rotate with the outer rotor (31), and is rotationally connected to the base (34) via a rotating shaft; The fan blade (4) is detachably connected to the end of the rotor shell (33) via the fixing cover (5).

4. The electric heater according to claim 3, characterized in that: The rotor shell (33) comprises an annular side wall (331), an end wall (332) and a protruding shaft (333), wherein the end wall (332) is connected to one end of the annular side wall (331), and the protruding shaft (333) is connected to the center of the end wall (332) and extends along the axial direction of the annular side wall (331); The extending shaft (333) passes through the fan blade (4), extends into the interior of the fixing cover (5), and is detachably connected to the fixing cover (5).

5. The electric heater according to claim 4, characterized in that: The fixed cover (5) comprises a cover body (51) and a fixed cap (52), wherein the fixed cap (52) is arranged in the middle of the cover body (51) and protrudes along the outside of the cover body (51); The fixing cap (52) is provided with an inner groove and is sleeved or threadedly connected to the extending shaft (333).

6. The electric heater according to claim 5, characterized in that: The inner groove of the fixing cap (52) is provided with an internal thread, the extending shaft (333) is provided with an external thread, and the fixing cap (52) and the extending shaft (333) are screwed and fixed; or The extending shaft (333) is provided with a first connecting hole (334), the fixing cap (52) is provided with a first through hole (53), and the first through hole (53) and the first connecting hole (334) are connected and fixed by a fastener.

7. The electric heater according to any one of claims 4 to 6, characterized in that: The rotor housing (33) further comprises a plurality of positioning posts (335), wherein the plurality of positioning posts (335) are arranged around the outer periphery of the extending shaft (333) and are fixedly connected to the end wall (332); The positioning column (335) passes through the fan blade (4) and the fixing cover (5) to achieve positioning, or the positioning column (335) passes through the fan blade (4) and the fixing cover (5) and is detachably connected to the fan blade (4) and the fixing cover (5) via fasteners.

8. The electric heater according to claim 7, characterized in that: The rotor shell (33) further comprises a plurality of reinforcing ribs, wherein the reinforcing ribs are fixedly connected to the end wall (332) and are respectively connected to the extending shaft (333) and the positioning column (335).

9. The electric heater according to claim 8, characterized in that: The reinforcing ribs include an inner ring convex rib (336), an outer ring convex rib (337) and a plurality of intermediate connecting ribs (338); the inner ring convex rib (336) is arranged outside the extending shaft (333); the outer ring convex rib (337) is arranged outside the inner ring convex rib (336); and each of the intermediate connecting ribs (338) sequentially connects the extending shaft (333), the positioning column (335) and the outer ring convex rib (337).

10. The electric heater according to any one of claims 4 to 6, characterized in that: The base (34) comprises a bottom (341) and an intermediate connecting shaft (342), wherein the intermediate connecting shaft (342) is rotatably connected to the bottom (341), and the intermediate connecting shaft (342) is fixedly connected to the extending shaft (333).

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