Fan with overlapped blades

Abstract

The utility model belongs to the technical field of fans, and particularly relates to an overlapped blade fan which comprises a first impeller, a connecting shaft, a bearing, a stator, a rotor, a support and a second impeller, the first impeller comprises a shell and a plurality of first blades arranged along the outer side of the shell, a mounting cavity with a bottom opening is formed in the inner side of the shell, and the rotor and the connecting shaft are arranged in the mounting cavity. A middle pipe extending upwards is arranged on the top side of the support, the stator sleeves the middle pipe, the bearing is arranged in the middle pipe, the second impeller comprises a cylinder and a plurality of second blades arranged along the periphery of the cylinder, a positioning portion is arranged on the cylinder, the bottom end of the connecting shaft penetrates through the middle pipe and the bearing, a positioning part is arranged on the periphery, close to the bottom end, of the connecting shaft, and the positioning part is connected with the positioning part in an inserted mode. The first impeller and the second impeller are coaxially arranged and located at the upper end and the lower end of the support respectively. The double impellers synchronously work through single drive, the heat dissipation air volume and efficiency of a single fan are effectively improved, the higher heat dissipation use requirement is met, and the experience feeling of a user is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fan technical field, especially relate to a superposition leaf fan. BACKGROUND

[0002] With the rapid development of science and technology, the operation efficiency of various electronic devices today is much higher than before, and the heat generated during operation is also much higher than before. The performance of the fan as the main heat dissipation device determines the heat dissipation capacity of the electronic device. The fan usually has an impeller, and the more blades on the impeller, the better the heat dissipation performance of the fan of the same size. However, the heat dissipation efficiency of a single fan is still limited, and multiple fans are connected in series to provide sufficient heat dissipation efficiency.

[0003] The Chinese patent document with publication number CN221033212U discloses a fan and a fan group, which includes a fan frame, an impeller assembly, a first fastener, a first electric connector, a second fastener, a second electric connector, a first magnetic attraction member, and a second magnetic attraction member magnetically attracted and matched with the first magnetic attraction member. The fan frame has a first side edge and a second side edge, and the first side edge and the second side edge are arranged opposite to each other. The impeller assembly is arranged in the fan frame. The first fastener and the second fastener are respectively attached to the first side edge and the second side edge. The first electric connector is arranged on the first fastener and exposed on the first side edge, and the second electric connector is arranged on the second fastener and exposed on the second side edge. The first electric connector and the second electric connector are respectively electrically connected to the impeller assembly. The first magnetic attraction member and the second magnetic attraction member are respectively arranged on the first side edge and the second side edge.

[0004] In the technical solution of the above patent document, one fan of the fan group is connected to another fan through the first electric connector with the first magnetic attraction member or the second electric connector with the second magnetic attraction member, realizing easy combination and mutual electrical connection of two or more fans. Although multiple fans effectively improve the heat dissipation efficiency, they occupy more horizontal space, and multiple electric connectors need to be arranged on a single fan, increasing the complexity of the circuit and the cost. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a superposition leaf fan, solving the problem that most existing fans have only one impeller, the heat dissipation efficiency of a single fan is limited, and multiple fan combinations increase the complexity of the circuit and the cost.

[0006] To achieve the above object, the utility model discloses an overlapping leaf fan, including first impeller, connecting shaft, bearing, stator, rotor, support and second impeller, the first impeller includes the casing, the plurality of first blade of setting along the casing outside, the casing inside is equipped with the installation cavity of bottom opening, the installation cavity is equipped with the rotor and connecting shaft, the support top side is equipped with the middle pipe that extends upwards, the stator is sleeved in the middle pipe outside, the bearing is located in the middle pipe, the second impeller includes the barrel, the plurality of second blade of setting along the barrel periphery, be equipped with the positioning part on the barrel, the bottom end of connecting shaft passes through the middle pipe, bearing, the outer periphery of connecting shaft is equipped with the positioning piece close to the bottom end, the positioning piece is inserted with the positioning part, makes the first impeller, second impeller coaxial arrangement and is located the upper and lower both ends of support respectively.

[0007] Further, the positioning part is a positioning groove, and the positioning piece is a positioning table formed by inwardly recessing the outer periphery of the connecting shaft, and the second impeller is sleeved on the positioning table through the positioning groove.

[0008] Further, it further includes a clamping ring, the positioning groove penetrates the barrel, the bottom end of the connecting shaft is recessed inward to form a clamping groove, the bottom end of the connecting shaft passes through the positioning groove to make the clamping groove extend out of the barrel, and the clamping ring is connected with the clamping groove and is used to lock the connecting shaft and the second impeller.

[0009] Further, the barrel is provided with a cavity with an opening at the top side, the bottom surface of the cavity faces the top side and is provided with an upwardly protruding mounting table, the mounting table is provided with the positioning groove, and the bottom of the mounting table and the bottom of the barrel form an empty slot.

[0010] Further, the height of the highest point of the top surface of the mounting table is less than or equal to the height of the open end of the barrel.

[0011] Further, the size of the first blade is greater than the size of the second blade, and the gap of the first blade is greater than the gap of the second blade.

[0012] Further, the casing is provided with a stepped hole, and the top end of the connecting shaft is provided with a limiting boss matched with the stepped hole.

[0013] Further, it further includes a spring, the spring is sleeved on the outer periphery of the connecting shaft, and the top end and the bottom end of the spring abut against the inner bottom surface of the casing and the bearing respectively.

[0014] The overlapping leaf fan provided by the utility model embodiment has at least the following technical effects:

[0015] When the stator is powered to drive the rotor to rotate, the first impeller rotates through the connecting shaft to drive the second impeller to rotate synchronously, realizing single driving to make the double impellers work synchronously, effectively improving the heat dissipation air volume and efficiency of a single fan, and meeting higher heat dissipation use requirements. Because the first impeller and the second impeller are located at the upper and lower ends of the bracket, the structure is compact, compared with the combination form of double fans in series, the use space and energy loss are reduced, the complexity of the circuit is reduced, and the cost is saved. The fan structure can be applied to heat dissipation fans in daily life, improves the overall air volume of the fan, and improves the experience of users. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Fig. 1 An exploded view of the overlapping leaf fan is provided for the embodiments of the present application.

[0018] Fig. 2 A sectional view of the overlapping leaf fan is provided for the embodiments of the present application.

[0019] Fig. 3 A structure diagram of the connecting shaft of the overlapping leaf fan is provided for the embodiments of the present application.

[0020] Fig. 4 A structure diagram of the second impeller of the overlapping leaf fan is provided for the embodiments of the present application.

[0021] In the figure, 100, the first impeller, 110, the shell, 111, the mounting cavity, 112, the stepped hole, 120, the first blade, 130, the rotor, 140, the spring;

[0022] 200, the connecting shaft, 210, the positioning piece, 220, the clamping groove, 230, the limiting boss;

[0023] 300, the bracket, 310, the middle pipe, 320, the stator, 330, the bearing;

[0024] 400, the second impeller, 410, the cylinder, 411, the positioning part, 412, the cavity, 420, the second blade, 430, the buckle ring, 440, the mounting table, 441, the air avoidance groove. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.

[0026] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0027] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0028] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0029] In an embodiment of the overlapping leaf fan of the present application, please refer to Figs. 1 to 4The overlapping blade fan comprises a first impeller 100, a connecting shaft 200, a bearing 330, a stator 320, a rotor 130, a bracket 300 and a second impeller 400. The first impeller 100 comprises a shell 110, a plurality of first blades 120 arranged on the outer side of the shell 110, a bottom-opened mounting cavity 111 arranged on the inner side of the shell 110, and the rotor 130 and the connecting shaft 200 arranged in the mounting cavity 111. The bracket 300 is provided with a middle pipe 310 extending upward on the top side. The stator 320 is sleeved on the outer side of the middle pipe 310. The bearing 330 is arranged in the middle pipe 310. The second impeller 400 comprises a cylinder 410 and a plurality of second blades 420 arranged on the outer periphery of the cylinder 410. The cylinder 410 is provided with a positioning part 411. The bottom end of the connecting shaft 200 penetrates through the middle pipe 310 and the bearing 330. The outer periphery of the connecting shaft 220 near the bottom end is provided with a positioning part 210. The positioning part 210 is inserted into the positioning part 411, so that the first impeller 100 and the second impeller 400 are coaxially arranged and located at the upper and lower ends of the bracket 300, respectively.

[0030] Specifically, since the first impeller 100 and the second impeller 400 share the same connecting shaft 200, when the stator 320 is energized to drive the rotor 130 to rotate, the first impeller 100 rotates to drive the second impeller 400 to rotate synchronously through the connecting shaft 200, so that single driving is realized to make the double impellers work synchronously. The heat dissipation air volume and efficiency of a single fan are effectively improved, and higher heat dissipation use requirements are met. Since the first impeller 100 and the second impeller 400 are located at the upper and lower ends of the bracket 200, the structure is compact, the use space is reduced compared with the combination form of double fans in series, the energy loss is reduced, the complexity of the circuit is reduced, and the cost is saved. The fan structure can be applied to heat dissipation fans in daily life, the overall air volume of the fan is improved, and the experience of the user is improved.

[0031] Further, the positioning part 411 is a positioning groove, and the positioning part 210 is a positioning table formed by inwardly recessing the outer periphery of the connecting shaft 200. The second impeller 400 is sleeved on the positioning table through the positioning groove. Specifically, the connecting mode through groove positioning makes the assembly operation simple.

[0032] Further, a clamping ring 430 is further included. The positioning groove 411 penetrates through the cylinder 410. The bottom end of the connecting shaft 200 is recessed inward to form a clamping groove 220. The bottom end of the connecting shaft 200 penetrates through the positioning groove 411 to make the clamping groove 220 extend out of the cylinder 410. The clamping ring 430 is connected with the clamping groove 220 and is used for locking the connecting shaft 200 and the second impeller 400. Specifically, the clamping ring 430 is connected with the clamping groove 220 to lock the one end of the connecting shaft 200 at the bottom of the second impeller 400, so as to prevent loosening and ensure the fixing effect of the connecting shaft 200 with the first impeller 100 and the second impeller 400. In addition, the clamping ring 430 facilitates maintenance and replacement of parts.

[0033] Further, the cylinder body 410 is provided with a top-side open cavity 412, the bottom surface of the cavity 412 is provided with an upwardly protruding mounting table 440, the mounting table 440 is provided with a positioning groove 411, and the bottom of the mounting table 440 and the bottom of the cylinder body 410 form an empty groove 441. Specifically, the end of the connecting shaft 200 and the snap ring 430 are located in the empty groove 411, so as to avoid interference with other parts when the connecting shaft 200 rotates and affect the rotation effect, and the upwardly protruding mounting table 440 enhances the structural strength of the positioning groove 411.

[0034] Further, the height of the highest point of the top surface of the mounting table 440 is less than or equal to the height of the open end of the cylinder body 410. Specifically, the higher the mounting table 440 is, the greater the contact area of the positioning groove 411 and the connecting shaft 200 is, and the stability of the connection is increased.

[0035] Further, the size of the first blade 120 is greater than the size of the second blade 420, and the gap of the first blade 120 is greater than the gap of the second blade 420. Specifically, the number of the second blades 420 is greater than the number of the first blades 120, the large first blades 120 of the first impeller are used to ensure the basic air volume, and the small second blades 420 of the second impeller are used to accelerate the airflow and enhance the directional air supply capacity, so as to realize the output of greater air volume.

[0036] Further, the shell 110 is provided with a stepped hole 112, and the connecting shaft 200 is provided with a limiting boss 230 matched with the stepped hole 112. Specifically, the connecting shaft and the first impeller can be separated, so as to reduce the assembly and production difficulty.

[0037] Further, a spring 140 is further included, the spring 140 is sleeved on the outer periphery of the connecting shaft 200, and the top end and the bottom end of the spring 140 abut against the inner bottom surface of the shell 110 and the bearing 330 respectively. Specifically, the spring 140 provides axial buffering and support, and reduces noise.

[0038] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An overlapping blade fan characterized by comprising: The first impeller, connecting shaft, bearing, stator, rotor, bracket and second impeller, the first impeller comprises a shell, a plurality of first blades arranged along the outer side of the shell, the inner side of the shell is provided with a bottom opening mounting cavity, the mounting cavity is provided with a rotor and a connecting shaft, the top side of the bracket is provided with an upwardly extending middle tube, the stator is sleeved outside the middle tube, the bearing is arranged in the middle tube, the second impeller comprises a barrel, a plurality of second blades arranged along the outer periphery of the barrel, the barrel is provided with a positioning part, the bottom end of the connecting shaft passes through the middle tube and the bearing, the outer periphery of the connecting shaft near the bottom end is provided with a positioning piece, the positioning piece is inserted with the positioning part, the first impeller and the second impeller are coaxially arranged and located at the upper and lower ends of the bracket respectively.

2. The overlapping leaf fan of claim 1, wherein: The positioning part is a positioning groove, and the positioning piece is a positioning table formed by inwardly recessing the outer periphery of the connecting shaft, and the second impeller is sleeved on the positioning table through the positioning groove.

3. The overlapping leaf fan of claim 2, wherein: Further comprising a buckle ring, the positioning groove penetrates the barrel, the bottom end of the connecting shaft is recessed inwardly to form a clamping groove, the bottom end of the connecting shaft passes through the positioning groove so that the clamping groove extends out of the barrel, the buckle ring is connected with the clamping groove and used for locking the connecting shaft and the second impeller.

4. The overlapping leaf fan of claim 3, wherein: The barrel is provided with a top side opening cavity, the bottom surface of the cavity is provided with an upwardly protruding mounting table towards the top side, the mounting table is provided with the positioning groove, and the bottom of the mounting table and the bottom of the barrel form an empty slot.

5. The overlapping leaf fan of claim 4, wherein: The height of the top surface of the mounting table is less than or equal to the height of the open end of the barrel.

6. The shrouded fan of any of claims 1-5, wherein: The size of the first blade is greater than that of the second blade, and the gap of the first blade is greater than that of the second blade.

7. The shrouded fan of any of claims 1-5, wherein: The shell is provided with a stepped hole, and the top end of the connecting shaft is provided with a limiting boss matched with the stepped hole.

8. The overlapping leaf fan of claim 7, wherein: Further comprising a spring, the spring is sleeved on the outer periphery of the connecting shaft, and the top end and the bottom end of the spring abut against the inner bottom surface of the shell and the bearing respectively.

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