High-performance cross-flow fan with improved structure

Abstract

The utility model discloses a high-performance cross-flow fan with an improved structure, which comprises a shell, an impeller and a motor, a side cutting edge is arranged on the side surface of the shell, a non-convex air outlet with a plane structure is formed on the side surface of an air outlet of the shell through the side cutting edge, and the air outlet is communicated with the inside of the shell; at least one circle of reinforcing ring is arranged on the periphery of each blade, and the reinforcing rings are connected with the outer sides of the blades to form a reinforcing structure for the blades. According to the utility model, the flat air outlet is formed by cutting one side of the air outlet of the shell in a similar manner, and a traditional structure of forming a volute type air outlet by extension is not adopted any more, so that the overall size can be obviously reduced, and the requirement of miniaturization is met; the shaft support and the stator base support are used for installing the shaft core and the stator base respectively, the assembling structure is simpler, and stability is good. The blades are thicker, and a circle of reinforcing ring is arranged on the outer side of each blade, so that the structural strength of the whole impeller is higher, and the stability is better during high-speed operation.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and in particular to a cross-flow fan mainly used in automobile air conditioners, new energy industries, industrial control, servers, game equipment, air conditioning cabinets, smart home appliances and other products. Background Art

[0002] A crossflow fan, also known as a crossflow fan, features a multi-bladed, elongated cylindrical impeller with forward-facing, multi-wing blades. As the impeller rotates, air flows through the impeller's open cascade, passing through the impeller's interior and exiting through the cascade on the other side into the volute, forming the working airflow. Advantages include low noise, uniform airflow, and unlimited axial length. Consequently, crossflow fans are used in a wide range of products, such as automotive air conditioners, power supplies, industrial control systems, servers, industrial equipment, and air conditioning cabinets. Current crossflow fans often suffer from the following drawbacks: First, the air outlet of the casing typically extends outward for a certain length, forming a volute. This results in a large casing, which does not meet current miniaturization requirements and is difficult to install in some applications. Second, the mounting structure for the shaft and stator is complex, resulting in poor stability. Third, the blades are often made of metal, which consumes a lot of power. Plastic blades, for example, are thinner, typically 1-2 mm thick, and can deform at high speeds of 3,000 rpm, negatively impacting performance. Fourth, there is usually only one circle of connecting ribs connecting each blade to the rubber shell, resulting in insufficient structural strength of the impeller. Utility Model Content

[0003] The utility model aims to solve the shortcomings of the prior art and provides a high-performance cross-flow fan with an improved structure, simpler assembly structure, good stability when the impeller runs at high speed, high strength, and smaller overall size.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a high-performance cross-flow fan with an improved structure, comprising a casing, an impeller and a motor, the motor being installed in the middle of the impeller, the impeller and the motor casing being installed on the stator, and the stator seat of the motor being assembled and fixed to the casing; the impeller having a plurality of blades arranged along the axial direction, and the blades being connected to form an integral structure by connecting ribs, characterized in that: a side cut edge is provided on the side of the casing, and a non-convex air outlet with a planar structure is formed on the side of the casing through the side cut edge, and the air outlet is connected to the interior of the casing; at least one circle of reinforcement ring is provided on the periphery of each blade, and the reinforcement ring is connected to the outer side of each blade to form a reinforcement structure for the blade.

[0005] Furthermore, arc-shaped air guide rings are respectively provided at the air inlets at both ends of the shell. The two air guide rings respectively extend inward to positions close to both ends of the impeller and are opposite to the air inlet ends of the impeller.

[0006] Furthermore, a shaft end bracket is installed at one end of the outer shell, and the shaft end bracket passes inward through the air guide ring at this end and extends into the interior of the impeller, and the shaft core of the motor and the shaft end bracket are assembled through the base; a stator seat bracket is installed at the other end of the outer shell, and the stator seat bracket passes inward through its corresponding air guide ring and extends into the interior of the impeller and is assembled and fixed with the stator seat of the motor.

[0007] Furthermore, the shaft end bracket is a tripod structure, the outer end of which is locked and fixed to the end face of the outer shell and the air guide ring by screws, and the inner end gathers toward the middle to form a fixed seat, through which the entire shaft end bracket forms an integrated structure, and the shaft core and the fixed seat are movably assembled.

[0008] Furthermore, a bearing is installed in the fixed seat through a bearing sleeve, and the shaft core and the bearing are assembled and fixed; a screw or a retaining ring is provided on the shaft core between the bearing and the motor and is sleeved with a spring or a spring, one end of the spring or spring is against the retaining ring, and the other end is against the bearing through a gasket.

[0009] Furthermore, the stator seat bracket includes three legs and an annular portion, and the annular portion and the three legs are connected to form an integrated structure; the three legs are locked and fixed to the end face of the outer shell and the air guide ring by screws at intervals of 120 degrees, and the annular portion extends into the impeller and abuts against the bottom surface of the stator seat to support the stator seat.

[0010] Furthermore, the motor housing of the motor is fixed to the impeller through a rubber-coated shell, and the rubber-coated shell is connected to the blades through connecting ribs to form an integrated structure; 8 groups of magnetic tiles are provided on the inner wall of the motor housing, corresponding to 8 poles.

[0011] Furthermore, the side cut edge is a whole straight edge, and the side cut edges at both ends are in contact with the outer edges of the air guide rings at both ends to reduce the size as much as possible.

[0012] Preferably, the thickness of each blade is 2-3 mm, such as 2.5 mm, which is thicker than the traditional 1-2 mm, thereby improving the structural strength and preventing deformation even at high rotation speeds (such as 3000 rpm).

[0013] The utility model forms a flat air outlet by similarly cutting off one side of the outer shell, and no longer adopts the traditional structure of forming a volute-type air outlet through extension, which can significantly reduce the overall size and meet the requirements of miniaturization; the shaft bracket and the stator seat bracket are used to respectively install the shaft core and the stator seat, which not only makes the assembly structure simpler but also has good stability; the blades are made thicker, and a circle of reinforcing rings are provided on the outside of the blades, so that the structural strength of the entire impeller is higher and the stability is better when running at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional structural diagram of the utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the utility model from another angle;

[0016] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0017] Figure 4 This is a bottom view schematic diagram of the utility model;

[0018] Figure 5 This is a graph showing the relationship between air volume and air pressure of a traditional fan;

[0019] Figure 6 This is a curve diagram showing the relationship between air volume and air pressure of the present utility model.

[0020] In the figure, 1 is the outer shell, 11 is the air guide ring, 12 is the side cut edge, 13 is the air outlet, 2 is the impeller, 21 is the blade, 22 is the rubber shell, 23 is the connecting rib, 24 is the reinforcement ring, 31 is the motor shell, 32 is the magnetic tile, 33 is the stator seat, 4 is the PCB board, 5 is the shaft core, 51 is the bearing sleeve, 52 is the spring, 53 is the retaining ring, 54 is the bearing, 6 is the shaft end bracket, 61 is the fixing seat, and 7 is the stator seat bracket. DETAILED DESCRIPTION

[0021] In this embodiment, refer to Figures 1-4 The high-performance cross-flow fan with the improved structure includes a housing 1 (generally an iron housing), an impeller 2, a PCB board 4 and a motor. The motor is installed in the middle of the impeller 2, and the impeller 2 is installed on the stator together with the motor housing 31. The stator seat 33 of the motor is assembled and fixed to the housing 1, and the PCB board 4 is installed in the stator seat 33; the impeller 2 has a plurality of blades 21 arranged along the axial direction, that is, forming a cross-flow fan, and the blades 21 are connected to each other by connecting ribs 23 to form an integral structure; a side cut edge 12 is provided on the side of the housing 1, and the side cut edge 12 forms a non-protruding air outlet 13 with a planar structure on the side of the housing 1, and the air outlet 13 is connected to the interior of the housing 1; at least one circle of reinforcement ring 24 is provided on the periphery of each blade 21, and the reinforcement ring 24 is connected to the outer side of each blade 21 to form a reinforcement structure for the blade 21, so that the structural strength of the impeller can be improved, thereby achieving a higher speed under the same conditions.

[0022] Arc-shaped air guide rings 11 (made of metal, such as aluminum alloy or iron rings) are respectively provided at the air inlets at both ends of the housing 1. The two air guide rings 11 extend inward to positions close to the two ends of the impeller 2 and are opposite to the air inlet ends of the impeller 2. Air enters the impeller 2 through the air guide rings 11, then enters the housing 1 through the gaps between the blades 21, and is finally discharged from the air outlet 13.

[0023] A shaft end bracket 6 is installed at one end of the outer shell 1, and the shaft end bracket 6 extends inward through the air guide ring 11 at this end into the interior of the impeller 2. The motor shaft core 5 and the shaft end bracket 6 are connected and assembled through bearings; a stator seat bracket 7 is installed at the other end of the outer shell 1, and the stator seat bracket 7 extends inward through its corresponding air guide ring 11 into the interior of the impeller 2 and is assembled and fixed with the stator seat 33 of the motor.

[0024] The shaft end bracket 6 is a tripod structure made of metal. Its outer end is locked and fixed to the end face of the shell 1 and the air guide ring 11 by screws, and the inner end gathers toward the middle to form a fixed seat 61. Through the fixed seat 61, the entire shaft end bracket 6 forms an integrated structure, and the shaft core 5 and the fixed seat 61 are movably assembled through a bearing connection.

[0025] A bearing 54 is mounted within a fixed seat 61 via a bearing sleeve 51. The shaft core 5 is fixed to the bearing 51 for rotation. A retaining ring 53 is located between the bearing 54 and the motor on the shaft core 5, and a spring 52 is sleeved thereon. One end of the spring 52 abuts against the retaining ring 53, while the other end abuts against the bearing 54 via a washer. This provides a buffering effect, reducing vibration and noise. Conventional rigid connections result in significant vibration.

[0026] The stator seat bracket 7 includes three legs and an annular portion, and the annular portion and the three legs are connected to form an integral structure; the three legs are locked and fixed to the end face of the shell 1 and the air guide ring 11 by screws at intervals of 120 degrees, and the annular portion extends into the impeller 2 and abuts against the bottom surface of the stator seat 33 to support the stator seat 33, so that the installation structure of the stator seat 33 is stable.

[0027] The motor housing 31 is secured to the impeller 2 via a rubber-coated shell 22, which is then connected to the impeller 21 via connecting ribs 23. Eight sets of magnetic tiles 32 are located on the inner wall of the motor housing 31, corresponding to eight poles. Using these strong magnetic tiles 32 instead of traditional rubber magnets increases the strength of the magnetic field, thereby improving the motor's efficiency.

[0028] The side cut edges 12 are a whole straight edge, and the side cut edges at both ends are in contact with the outer edges of the air guide rings 11 at both ends to minimize the size.

[0029] The thickness of each blade 21 is 2-3 mm, such as 2.5 mm, which is thicker than the traditional 1-2 mm, thereby improving the structural strength and preventing deformation even at high speeds, such as when the maximum speed is increased from 1500 rpm to 3000 rpm.

[0030] This can also significantly increase the air volume and air pressure. The test results are shown in Tables 1 and 2, where Table 1 is the performance test results of a traditional fan and Table 2 is the performance test results of the fan of the present invention.

[0031] Table 1 Traditional fan performance test results

[0032]

[0033] Table 2 Performance test results of the fan of the utility model

[0034]

[0035] It can be seen from Table 1 and Table 2 that the maximum wind pressure of the fan of the present invention is 71.20 mmAq, and the maximum air volume is 823.40 CFM (when the fan speed is 2340 rpm); while the maximum wind pressure of the traditional fan is 38.90 mmAq, and the maximum air volume is 751.70 CFM (when the fan speed is 1440 rpm). Obviously, the wind pressure and air volume of the present invention are greater than those of the traditional fan, and the performance mutation of the traditional fan is more drastic and the performance stability is poor.

[0036] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A high-performance crossflow fan with an improved structure, comprising a housing, an impeller, and a motor, wherein the motor is mounted in the middle of the impeller, the impeller and the motor housing are mounted on the stator, and the stator seat of the motor is assembled and fixed to the housing; the impeller has a plurality of axially arranged blades, each blade connected to form an integral structure by connecting ribs, and is characterized by: A side cut edge is provided on the side of the shell, and a non-convex air outlet with a planar structure is formed on the side of the shell through the side cut edge, and the air outlet is connected to the interior of the shell; at least one circle of reinforcement ring is provided on the periphery of each blade, and the reinforcement ring is connected to the outer side of each blade to form a reinforcement structure for the blade.

2. The high-performance crossflow blower with an improved structure according to claim 1, characterized in that: Arc-shaped air guide rings are respectively provided at the air inlets at both ends of the shell. The two air guide rings extend inwardly to positions close to both ends of the impeller and are opposite to the air inlet ends of the impeller.

3. The high-performance crossflow blower with an improved structure according to claim 2, characterized in that: A shaft end bracket is installed at one end of the outer shell, and the shaft end bracket passes inward through the air guide ring at this end and extends into the interior of the impeller, and the shaft core of the motor is movably assembled with the shaft end bracket; a stator seat bracket is installed at the other end of the outer shell, and the stator seat bracket passes inward through its corresponding air guide ring and extends into the interior of the impeller and is assembled and fixed with the stator seat of the motor.

4. The high-performance crossflow blower with an improved structure according to claim 3, characterized in that: The shaft end bracket is a tripod structure, the outer end of which is locked and fixed to the end face of the shell and the air guide ring by screws, and the inner end gathers toward the middle to form a fixed seat, through which the entire shaft end bracket forms an integrated structure, and the shaft core and the fixed seat are movably assembled.

5. The high-performance cross-flow blower with an improved structure according to claim 4, characterized in that: A bearing is installed in the fixed seat through a bearing sleeve, and the shaft core and the bearing are assembled and fixed; a screw or a retaining ring is provided on the shaft core between the bearing and the motor and is sleeved with a spring or a spring, one end of the spring or spring is against the retaining ring, and the other end is against the bearing through a gasket.

6. The high-performance cross-flow fan with an improved structure according to claim 3, characterized in that: The stator seat bracket includes three legs and an annular portion, and the annular portion and the three legs are connected to form an integral structure; the three legs are locked and fixed to the end face of the shell and the air guide ring by screws at intervals of 120 degrees, and the annular portion extends into the impeller and abuts against the bottom surface of the stator seat to support the stator seat.

7. The high-performance crossflow blower with an improved structure according to claim 1, characterized in that: The motor housing of the motor is fixed to the impeller through a rubber-coated shell, and the rubber-coated shell is connected to the blades through connecting ribs to form an integrated structure; 8 groups of magnetic tiles are arranged on the inner wall of the motor housing.

8. The high-performance cross-flow fan with an improved structure according to claim 2, characterized in that: The side cut edge air outlet is a whole straight edge, and the side cut edges at both ends are in contact with the outer edges of the air guide rings at both ends.

9. The high-performance cross-flow blower with an improved structure according to claim 1, characterized in that: The thickness of each leaf is 2-3 mm.

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