Fan

Abstract

The utility model relates to the technical field of fans, and provides a fan which comprises a machine shell, a motor and an impeller. The shell is provided with a shell wall part and a motor mounting part connected with the shell wall part; an annular wall part is arranged on the periphery of the motor mounting part; a motor is mounted on the motor mounting part; an impeller is mounted on the motor; the impeller is provided with an impeller cup part and a plurality of large fan blades uniformly distributed on the outer wall of the impeller cup part; the open end of the impeller cup part corresponds to the annular wall part in the vertical direction and does not make contact with the annular wall part. A plurality of small fan blades are evenly arranged at the open end of the impeller cup part in the circumferential direction. According to the utility model, the air volume of the fan can be enhanced, the heat dissipation effect is improved, and dust and foreign matters are prevented from entering the motor.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a fan. Background Technology

[0002] Cooling fans can be installed in various devices and are used in a variety of scenarios. A common fan structure involves an impeller mounted on a motor, which in turn is mounted on the fan housing. The motor drives the impeller and its blades to rotate, achieving a cooling effect. There is a gap between the impeller and the fan housing to allow for proper impeller operation.

[0003] Because there is a gap between the impeller and the casing, dust and foreign objects may be sucked in when the blades guide the air, and enter the motor. Over time, this can damage the motor and cause fan failure. Utility Model Content

[0004] This invention primarily addresses the technical problem of existing fans where a gap exists between the impeller and the casing, allowing dust and foreign objects to be sucked in during airflow and enter the motor, potentially causing motor damage and fan malfunction over time. The invention proposes a fan that enhances airflow, improves heat dissipation, and prevents dust and foreign objects from entering the motor.

[0005] This utility model provides a fan, including: a housing, a motor, and an impeller;

[0006] The housing has a housing wall portion and a motor mounting portion connected to the housing wall portion;

[0007] The outer periphery of the motor mounting portion has an annular wall portion; a motor is mounted on the motor mounting portion; an impeller is mounted on the motor;

[0008] The impeller has an impeller cup and multiple large blades evenly distributed on the outer wall of the impeller cup;

[0009] The opening end of the impeller cup corresponds vertically to the annular wall but does not contact it; multiple small fan blades are evenly arranged circumferentially at the opening end of the impeller cup.

[0010] Preferably, the small fan blades are curved.

[0011] Preferably, the small fan blades protrude axially toward the annular wall portion of the impeller cup portion;

[0012] The small fan blades protrude radially inward from the impeller cup portion.

[0013] Preferably, the small fan blades and the large fan blades extend in the same radially outward direction.

[0014] Preferably, each large fan blade corresponds to two or more small fan blades.

[0015] Preferably, the position of the small fan blade is offset from the position of the root of the large fan blade.

[0016] Preferably, the inner wall of the impeller cup is uniformly provided with a plurality of extended ribs;

[0017] The position of the extended rib is offset from the position of the small fan blade.

[0018] Preferably, the motor mounting portion is connected to the housing wall portion by multiple connecting ribs.

[0019] This invention provides a fan with small blades in the impeller cup. While the large blades rotate, the small blades also perform work and generate airflow, enhancing the fan's air volume. Furthermore, the rotation of the small blades dissipates heat generated within the motor, improving heat dissipation, reducing temperature rise, and enhancing motor performance. Simultaneously, the rotation of the small blades blows out foreign objects from the motor, preventing dust and other debris from entering and extending the motor's lifespan. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the fan provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the fan provided by this utility model;

[0022] Figure 3 This is an axial sectional view of the fan provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the housing provided by this utility model;

[0024] Figure 5 This is a schematic diagram of the impeller provided by this utility model.

[0025] Reference numerals: 1. Casing; 2. Impeller; 3. Motor; 101. Casing wall; 102. Motor mounting part; 103. Annular wall; 104. Connecting rib; 201. Impeller cup; 202. Large fan blade; 203. Small fan blade; 204. Extending rib. Detailed Implementation

[0026] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0027] like Figure 1-3 As shown in the figure, a fan provided by this utility model embodiment includes: a housing 1, a motor 3, and an impeller 2.

[0028] like Figure 4 As shown, the housing 1 has a housing wall portion 101 and a motor mounting portion 102 connected to the housing wall portion 101. The motor mounting portion 102 is connected to the housing wall portion 101 by multiple connecting ribs 104. The outer periphery of the motor mounting portion 102 has an annular wall portion 103; a motor 3 is mounted on the motor mounting portion 102; and an impeller 2 is mounted on the motor 3.

[0029] like Figure 5 As shown, the impeller 2 has an impeller cup portion 201 and a plurality of large fan blades 202 evenly distributed on the outer wall of the impeller cup portion 201; the open end of the impeller cup portion 201 corresponds vertically to the annular wall portion 103 but does not contact it; a plurality of small fan blades 203 are evenly arranged circumferentially at the open end of the impeller cup portion 201. The small fan blades 203 are curved. Specifically, the small fan blades 203 protrude axially toward the annular wall portion 103 of the impeller cup portion 201; the small fan blades 203 protrude radially inward toward the impeller cup portion 201.

[0030] Each large fan blade 202 corresponds to two or more small fan blades 203. The positions of the small fan blades 203 are offset from the root positions of the large fan blades 202 to avoid affecting the large fan blades 202. The small fan blades 203 extend radially outward in the same direction as the large fan blades 202. When the large fan blades 202 rotate, the small fan blades 203 can also do work simultaneously, generating airflow at the same time as the large fan blades 202. The small fan blades 203 rotate in the same direction as the large fan blades 202. The total airflow of this fan is equal to the sum of the airflow generated by the large fan blades 202 and the airflow generated by the small fan blades 203. The small fan blades 203 can enhance the airflow of the fan.

[0031] In addition, a plurality of extended ribs 204 are evenly provided on the inner wall of the impeller cup portion 201; the positions of the extended ribs 204 are staggered from the positions of the small fan blades 203 to avoid affecting the small fan blades 203. The extended ribs 204 are used to cooperate and connect with the magnet holder of the motor 3.

[0032] This invention features a small fan blade 203 in the impeller cup section 201. While the large fan blade 202 rotates, the small fan blade 203 also performs work and generates airflow, enhancing the fan's air volume. Furthermore, the rotation of the small fan blade 203 dissipates heat generated within the motor, improving heat dissipation, reducing temperature rise, and enhancing motor performance. Simultaneously, the rotation of the small fan blade 203 blows out foreign objects from inside the motor, extending its lifespan.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fan, characterized in that, include: Casing (1), motor (3) and impeller (2); The housing (1) has a housing wall (101) and a motor mounting part (102) connected to the housing wall (101); The outer periphery of the motor mounting part (102) has an annular wall part (103); a motor (3) is mounted on the motor mounting part (102); an impeller (2) is mounted on the motor (3); The impeller (2) has an impeller cup (201) and a plurality of large blades (202) evenly distributed on the outer wall of the impeller cup (201); The opening end of the impeller cup (201) corresponds vertically to the annular wall (103) but does not contact it; a plurality of small fan blades (203) are evenly arranged circumferentially at the opening end of the impeller cup (201).

2. The fan according to claim 1, characterized in that, The small fan blades (203) are curved.

3. The fan according to claim 2, characterized in that, The small fan blade (203) protrudes axially toward the annular wall portion (103) of the impeller cup portion (201); The small fan blade (203) protrudes radially inward from the impeller cup portion (201).

4. The fan according to claim 2, characterized in that, The small fan blade (203) extends radially outward in the same direction as the large fan blade (202).

5. The fan according to claim 4, characterized in that, Each large fan blade (202) corresponds to two or more small fan blades (203).

6. The fan according to claim 5, characterized in that, The position of the small fan blade (203) is offset from the root position of the large fan blade (202).

7. The fan according to claim 1, characterized in that, The inner wall of the impeller cup (201) is uniformly provided with a plurality of extended ribs (204); The position of the extended rib (204) is offset from the position of the small fan blade (203).

8. The fan according to claim 1, characterized in that, The motor mounting part (102) is connected to the housing wall part (101) by multiple connecting ribs (104).

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