Low-noise fan

Abstract

The utility model discloses a low-noise fan which comprises a shell, the shell is provided with an installation cavity, the installation cavity is provided with an air inlet and an air outlet, the inner wall of the installation cavity is provided with an annular groove, and the annular groove extends along the end wall of the air inlet; the wind wheel is mounted in the mounting cavity, and the top end of the wind wheel and the annular groove are arranged in a spaced mode. The annular groove is formed in the inner wall of the mounting cavity of the shell to assemble the top end of the wind wheel, part of airflow is guided to flow back in the annular groove, vortex and turbulent flow are reduced, airflow flowing is more stable, and therefore noise is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a low-noise fan. Background Art

[0002] After the impeller of an existing fan is assembled with the casing, the top of the impeller usually directly rests against the inner wall of the casing. When the impeller rotates at high speed, the airflow flows in the narrow channel between the impeller and the casing, which easily forms eddies and turbulence. The eddies will increase the resistance to fluid flow, thereby generating noise, and the turbulence will cause instability in the fluid flow, further aggravating the generation of noise. In addition, it is also easy to cause resonance. That is, when the vibration frequency generated by the rotation of the impeller is close to the natural frequency of the casing, resonance will occur, resulting in noise amplification and a poor customer experience. Utility Model Content

[0003] In order to overcome at least one of the defects described in the above-mentioned prior art, the utility model provides a low-noise fan, in which an annular groove is provided on the inner wall of the shell mounting cavity, guiding part of the airflow to flow back in the annular groove, reducing the formation of eddies and turbulence, making the airflow flow smoother, and thus reducing noise.

[0004] The technical solution adopted by the present invention to solve the problem is:

[0005] A low-noise fan, comprising:

[0006] A housing having a mounting cavity provided with an air inlet and an air outlet; an inner wall of the mounting cavity provided with an annular groove extending along an end wall of the air inlet;

[0007] A wind wheel is installed in the installation cavity, and the top of the wind wheel is spaced apart from the annular groove.

[0008] Furthermore, the shell includes a first shell and a second shell, the air inlet is formed on the first shell, the first shell and the second shell are detachably connected, and the installation cavity and the air outlet are formed after the connection; a plurality of first locking parts are provided on the first shell, and the plurality of first locking parts are evenly distributed along the circumference of the first shell; a plurality of second locking parts are provided on the second shell, and the plurality of second locking parts are evenly distributed along the circumference of the second shell, and the plurality of second locking parts are arranged one by one corresponding to the plurality of first locking parts and are snap-connected to lock the shell; at least two first locking parts and at least two second locking parts are symmetrically distributed on both sides of the air outlet.

[0009] Furthermore, there are three first locking parts and three second locking parts respectively, the three first locking parts and the three second locking parts are distributed at intervals on the shell, and the two first locking parts and the two second locking parts are symmetrically distributed on both sides of the air outlet.

[0010] Furthermore, the first locking portion includes a buckle, which is provided with a snap-on groove; the outer periphery of the second shell is provided with a hook, which forms the second locking portion, and the buckle is used to abut against the outer periphery of the second shell when the first shell is connected to the second shell, and the hook is used to be snapped into the snap-on groove when the buckle abuts against the outer periphery of the second shell.

[0011] Furthermore, a guide surface is provided on the end wall of at least one of the hook or the engaging groove, and the guide surface is used to guide the hook to engage with or disengage from the engaging groove.

[0012] Furthermore, a first abutting step is provided at the bottom end of the first shell, a first limiting plate is provided on the outer side of the first abutting step, a second abutting step is provided on the top end of the second shell, and a second limiting plate is provided on the inner side of the second abutting step. When the first shell is connected to the second shell, the first abutting step abuts against the second abutting step, and the first limiting plate abuts against the second limiting plate, so that the first shell and the second shell fit together.

[0013] Furthermore, a snap-fit ​​piece is provided on the first abutting step, and a connecting notch is provided on the second limiting piece. The snap-fit ​​piece and the connecting notch are correspondingly arranged and located on one side of the air outlet. The snap-fit ​​piece is used to snap into the connecting notch when the first abutting step and the second abutting step abut against each other.

[0014] Furthermore, a positioning column is provided at the bottom of the first shell, and a positioning hole is provided at the top of the second shell. After the first shell and the second shell are connected, the positioning column extends into the positioning hole.

[0015] Furthermore, a connecting hole is provided in the positioning column, and the connecting hole is connected with the positioning hole and is used for passing a connecting piece.

[0016] Furthermore, a connecting shaft is provided at the bottom of the wind wheel, and a through hole is provided in the second shell. After the wind wheel is installed in the installation cavity, the connecting shaft is inserted into the through hole.

[0017] In summary, the low-noise fan provided by the present invention has the following technical effects:

[0018] After the impeller is installed in the installation cavity, the top of the impeller is spaced apart from the annular groove, thereby isolating the impeller from direct contact with the housing to a certain extent, reducing the transmission and amplification of vibration on the housing, and thus reducing noise generation;

[0019] In addition, when the wind wheel rotates in the shell, a specific space is formed between its top and the annular groove. This space allows part of the airflow to flow back during the rotation of the wind wheel. That is, the airflow entering from the air inlet forms a backflow in the space formed between the top of the wind wheel and the annular groove under the action of the wind wheel, that is, the airflow circulates in this space. On the one hand, the backflow airflow can slow down the direct impact of the airflow between the top of the wind wheel and the shell, thereby reducing the noise generated by the impact. On the other hand, the backflow airflow can also balance the airflow disturbance generated by the rotation of the wind wheel to a certain extent, making the overall airflow flow smoother and further reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure decomposition of the utility model;

[0022] Figure 3 This is a schematic structural diagram of the first shell in the present utility model;

[0023] Figure 4 This is a schematic structural diagram of the second housing in the present invention;

[0024] Figure 5 This is a schematic structural diagram of the wind wheel in the utility model;

[0025] The meanings of the reference numerals are as follows:

[0026] 10. Shell; 11. First shell; 111. Buckle; 1111. Snap-fit ​​groove; 112. Snap-fit ​​plate; 113. First abutment step; 1131. First limiting plate; 114. Air inlet; 115. Annular groove; 116. Positioning column; 1161. Connecting hole; 12. Second shell; 121. Hook; 1211. Guide surface; 122. Second abutment step; 1221. Second limiting plate; 1222. Connecting notch; 123. Positioning hole; 124. Through-hole; 13. Air outlet; 20. Wind wheel; 21. Connecting shaft. DETAILED DESCRIPTION

[0027] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] See Figures 1 to 5 The utility model discloses a low-noise fan, including a shell 10 and a wind wheel 20. The shell 10 has an installation cavity, the installation cavity is provided with an air inlet 114 and an air outlet 13, the inner wall of the installation cavity is provided with an annular groove 115, and the annular groove 115 is extended along the end wall of the air inlet 114. Specifically, the wind wheel 20 is installed in the installation cavity, and the top end of the wind wheel 20 is located below the annular groove 115 after the wind wheel 20 is installed in the installation cavity, and is spaced apart from the annular groove 115.

[0031] On the basis of the above structure, during assembly, after the wind wheel 20 is installed in the installation cavity, the top end of the wind wheel 20 is located below the annular groove 115. Since the annular groove 115 is extended along the end wall of the air inlet 114, when the wind wheel 20 rotates at high speed, the airflow can be introduced into the installation cavity at the air inlet 114 when the wind wheel 20 rotates at high speed, and then discharged from the air outlet 13, so that convection is formed in the installation cavity to generate wind energy.

[0032] Specifically, since the top of the wind wheel 20 is located below the annular groove 115 after installation, and the top of the wind wheel 20 is spaced apart from the annular groove 115, direct contact between the wind wheel 20 and the housing 10 can be isolated to a certain extent, reducing the transmission and amplification of vibration on the housing 10, thereby reducing noise generation;

[0033] At the same time, the gap between the top of the wind wheel 20 and the annular groove 115 also forms a specific space. When the wind wheel 20 rotates in the installation cavity, this space allows part of the airflow to flow back during the rotation of the wind wheel 20. That is, when the wind wheel 20 rotates at high speed, the airflow entering from the air inlet 114 forms a backflow in the space formed between the top of the wind wheel 20 and the annular groove 115, that is, the airflow circulates in this specific space. On the one hand, the backflow airflow can slow down the direct impact of the airflow between the top of the wind wheel 20 and the shell 10, thereby reducing the noise generated by the impact. On the other hand, the backflow airflow can also balance the airflow disturbance generated when the wind wheel 20 rotates to a certain extent, making the overall airflow flow smoother and further reducing noise.

[0034] It should be noted that in this embodiment, the inner diameter of the annular groove 115 is larger than the outer diameter of the wind wheel 20 to ensure that the wind wheel 20 does not rub or collide with the edge of the annular groove 115 during rotation, thereby avoiding additional resistance caused by friction, allowing the airflow to pass through the wind wheel 20 more smoothly and flow to the air outlet 13, reducing the noise generated by obstructed airflow.

[0035] Furthermore, the shell 10 includes a first shell 11 and a second shell 12, and the air inlet 114 is formed on the first shell 11. The first shell 11 and the second shell 12 are detachably connected, and an installation cavity and an air outlet 13 are formed after the connection. Specifically, a plurality of first locking parts are provided on the first shell 11, and the plurality of first locking parts are evenly distributed along the circumference of the first shell 11. A plurality of second locking parts are provided on the second shell 12, and the plurality of second locking parts are evenly distributed along the circumference of the second shell 12. The plurality of second locking parts are arranged one by one corresponding to the plurality of first locking parts and are snap-connected to lock the shell 10, and at least two first locking parts and at least two second locking parts are symmetrically distributed on both sides of the air outlet 13.

[0036] On the basis of this structure, during assembly, since the shell 10 is composed of the first shell 11 and the second shell 12, the wind wheel 20 can be assembled with the first shell 11 or the second shell 12 first, and then fixed and then the first shell 11 and the second shell 12 are snap-connected through multiple first locking parts and multiple second locking parts, so that the first shell 11 and the second shell 12 are connected and locked. Since the first locking part and the second locking part are snap-connected, the first shell 11 and the second shell 12 are detachable. In this way, when the wind wheel 20 or other accessories inside the shell 10 need to be maintained later, it is only necessary to detach the first locking part and the second locking part to make the first shell 11 and the second shell 12 in an unlocked state, which can be disassembled at any time for easy maintenance later.

[0037] More specifically, when the wind wheel 20 is running, the airflow is accelerated by the blades and concentratedly discharged from the air outlet 13, so the wind pressure at the air outlet 13 reaches a maximum value, and the airflow speed at the air outlet 13 will increase significantly, forming a local high-speed airflow, so the wind force is also the largest. Therefore, in this embodiment, at least two first locking parts and at least two second locking parts are symmetrically distributed on both sides of the air outlet 13, so that both sides of the air outlet 13 are locked at the same time, so as to provide more stable support for the air outlet 13 through the two symmetrical first locking parts and at least two second locking parts, thereby avoiding the vibration and noise caused by the shaking of the first shell 11 and the second shell 12 due to the wind force concentrated on the air outlet 13, thereby reducing the generation of noise.

[0038] In addition, the symmetrical arrangement makes the first locking portion and the second locking portion on both sides more evenly stressed, reducing the additional stress and vibration caused by uneven stress, thereby improving the overall safety and stability of the wind wheel 20 and further reducing noise generation.

[0039] It should be noted that the first locking portion can be a structure such as a buckle, a block or a snap strip formed on the first shell 11, while the second locking portion is formed by a corresponding slot, a snap hole or other structure formed on the second shell 12. Of course, the first locking portion can also be a structure such as a slot, a snap hole or other structure formed on the first shell 11, while the second locking portion is a corresponding buckle, a block or a snap strip or other structure. The specific setting can be based on actual needs.

[0040] Preferably, in this embodiment, there are three first locking parts and three second locking parts respectively, and the three first locking parts and the three second locking parts are symmetrically distributed in the circumference of the shell 10, and the two first locking parts and the two second locking parts are symmetrically distributed on both sides of the air outlet 13.

[0041] Based on the above structure, the three first locking parts and the three second locking parts are symmetrically distributed on the circumference of the shell 10, which can ensure that the first shell 11 and the second shell 12 are evenly stressed when locked, avoiding the problem of local stress concentration caused by uneven force. This distribution method can more effectively resist wind loads, reduce the vibration and swing of the shell 10 caused by excessive wind force, effectively reduce the generation of noise, and improve the stability of the entire structure.

[0042] More specifically, three first locking parts and three second locking parts are provided respectively, which can reduce unnecessary materials while ensuring the stability of the wind wheel 20, and is more environmentally friendly and economical.

[0043] Furthermore, the first locking portion includes a buckle 111, a snap-fit ​​groove 1111 is provided on the buckle 111, and a hook 121 is provided on the outer periphery of the second shell 12. The hook 121 forms a second locking portion. The buckle 111 is used to abut against the outer periphery of the second shell 12 when the first shell 11 and the second shell 12 are connected. The hook 121 is snapped into the snap-fit ​​groove 1111 when the buckle 111 abuts against the outer periphery of the second shell 12.

[0044] Specifically, when the first shell 11 is connected to the second shell 12, the buckle 111 rests against the outer periphery of the second shell 12 to preliminarily lock the second shell 12. At this time, the hook 121 on the second shell 12 is engaged with the engaging groove 1111 to lock the first shell 11 and the second shell 12. In this way, the structure of the first shell 11 and the second shell 12 after assembly is more stable and less prone to shaking, thereby reducing noise.

[0045] Furthermore, a guide surface 1211 is provided on at least one end wall of the hook 121 or the engaging groove 1111 . The guide surface 1211 is used to guide the hook 121 to engage with or disengage from the engaging groove 1111 .

[0046] Specifically, the guiding surface 1211 may be a sloped surface to reduce the friction between the hook 121 and the end wall of the engaging groove 1111 , so that the hook 121 can more easily slide into the engaging groove 1111 when approaching the engaging groove 1111 through the guidance of the sloped surface.

[0047] Of course, the guide surface 1211 can also be an arc surface, which provides a continuous and smooth transition so that the hook 121 can fit the shape of the slot more naturally when sliding into the engaging slot 1111. This natural transition reduces the obstruction and friction that may be encountered during the sliding process, making the sliding process smoother.

[0048] Furthermore, a first abutting step 113 is provided at the bottom end of the first shell 11, and a first limiting plate 1131 is provided on the outer side of the first abutting step 113. A second abutting step 122 is provided at the top end of the second shell 12, and a second limiting plate 1221 is provided on the inner side of the second abutting step 122. When the first shell 11 and the second shell 12 are connected, the first abutting step 113 abuts against the second abutting step 122, and the first limiting plate 1131 abuts against the second limiting plate 1221, so that the first shell 11 and the second shell 12 are fitted together.

[0049] Specifically, when the first shell 11 and the second shell 12 are connected, there is often a small gap due to factors such as manufacturing and installation. Therefore, in this embodiment, a first abutment step 113 is provided at the bottom end of the first shell 11 (that is, the end face connected to the second shell 12), and a first limiting piece 1131 is provided on the outer side of the first abutment step 113, and a second abutment step 122 is provided at the top end of the second shell 12 (that is, the end face connected to the first shell 11), and a second limiting piece 1221 is provided on the inner side of the second abutment step 122. When the first abutment step 113 abuts the second abutment step 122, the first limiting piece 1131 abuts the second limiting piece 1221, so as to indirectly increase the contact area of ​​the connection between the first shell 11 and the second shell 12, thereby enhancing the stability of the connection. When subjected to external forces, the steps can more effectively disperse and resist these forces, thereby preventing the first shell 11 and the second shell 12 from loosening or vibrating due to external forces, avoiding noise generation, and making the structure more stable.

[0050] More specifically, a snap-fit ​​piece 112 is provided on the first abutting step 113, and a connecting notch 1222 is provided on the second limiting piece 1221. The snap-fit ​​piece 112 and the connecting notch 1222 are correspondingly arranged and located on one side of the air outlet 13. Then, when the first abutting step 113 and the second abutting step 122 abut, the snap-fit ​​piece 112 can be snapped into the connecting notch 1222 to preliminarily lock the connection between the first shell 11 and the second shell 12. Thereafter, the hook 121 is snapped into the snap-fit ​​groove 1111 on the buckle 111, further locking the first shell 11 and the second shell 12. Since the snap-fit ​​piece 112 and the connecting notch 1222 are arranged on one side of the air outlet 13, the structure at the air outlet 13 is more stable. In this way, even if the wind force is concentrated on the air outlet 13, the connection between the first shell 11 and the second shell 12 at the air outlet 13 is not easy to shake, further reducing the probability of noise generation.

[0051] Furthermore, a positioning post 116 is provided at the bottom of the first shell 11 , and a positioning hole 123 is provided at the top of the second shell 12 . After the first shell 11 and the second shell 12 are connected, the positioning post 116 extends into the positioning hole 123 .

[0052] Specifically, when the first shell 11 and the second shell 12 are connected, the positioning post 116 extends into the positioning hole 123 to preliminarily lock the first shell 11 and the second shell 12, and then multiple locking is carried out through the snap-fit ​​piece 112 and the connecting notch 1222 and the snap 111 and the hook 121 to lock the first shell 11 and the second shell 12 layer by layer, making the connection between the two more stable and less likely to loosen or vibrate after being subjected to force, thereby achieving the effect of noise reduction.

[0053] More specifically, a connecting hole 1161 is provided in the positioning column 116, and the connecting hole 1161 is connected to the positioning hole 123. When the positioning column 116 is extended into the positioning hole 123, the connecting member (such as a screw or a screw, etc.) is passed through the connecting hole 1161 and the positioning hole 123 in turn to further lock the first shell 11 and the second shell 12 to prevent the two from loosening, and the overall structure is more stable.

[0054] Furthermore, a connecting shaft 21 is provided at the bottom of the wind wheel 20, and a through hole 124 is provided in the second shell 12. During the specific assembly, after the wind wheel 20 is installed in the installation cavity, the connecting shaft 21 can be rotatably passed through the through hole 124, so that the wind wheel 20 can be rotatably assembled in the installation cavity and can rotate after power is supplied.

[0055] It should be noted that the connecting shaft 21 is specifically arranged at the axis of the wind wheel 20, and the through hole 124 is coaxial with the connecting shaft 21 to ensure the stability of the wind wheel 20 during the rotation process.

[0056] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A low-noise fan, characterized in that: include: A housing having a mounting cavity, the mounting cavity being provided with an air inlet and an air outlet, an inner wall of the mounting cavity being provided with an annular groove, the annular groove extending along the end wall of the air inlet; A wind wheel, the wind wheel is installed in the installation cavity, and the top of the wind wheel is spaced apart from the annular groove; The shell includes a first shell and a second shell, the air inlet is formed on the first shell, the first shell and the second shell are detachably connected, and the installation cavity and the air outlet are formed after the connection; a plurality of first locking parts are provided on the first shell, and the plurality of first locking parts are evenly distributed along the circumference of the first shell; a plurality of second locking parts are provided on the second shell, and the plurality of second locking parts are evenly distributed along the circumference of the second shell, and the plurality of second locking parts are arranged one by one corresponding to the plurality of first locking parts and are snap-connected to lock the shell; at least two first locking parts and at least two second locking parts are symmetrically distributed on both sides of the air outlet.

2. The low-noise fan according to claim 1, wherein: There are three first locking parts and three second locking parts respectively, the three first locking parts and the three second locking parts are distributed at intervals on the shell, and the two first locking parts and the two second locking parts are symmetrically distributed on both sides of the air outlet.

3. The low-noise fan according to claim 2, wherein: The first locking portion includes a buckle, which is provided with a snap-on groove; the outer periphery of the second shell is provided with a hook, which forms the second locking portion, and the buckle is used to abut against the outer periphery of the second shell when the first shell is connected to the second shell, and the hook is used to be snapped into the snap-on groove when the buckle abuts against the outer periphery of the second shell.

4. The low-noise fan according to claim 3, wherein: A guide surface is provided on the end wall of at least one of the hook or the engaging groove, and the guide surface is used to guide the hook to engage with or disengage from the engaging groove.

5. The low-noise fan according to claim 4, wherein: A first abutting step is provided at the bottom end of the first shell, a first limiting plate is provided on the outer side of the first abutting step, a second abutting step is provided on the top end of the second shell, and a second limiting plate is provided on the inner side of the second abutting step. When the first shell is connected to the second shell, the first abutting step abuts against the second abutting step, and the first limiting plate abuts against the second limiting plate, so that the first shell and the second shell fit together.

6. The low-noise fan according to claim 5, wherein: A snap-fitting piece is provided on the first abutting step, and a connecting notch is provided on the second limiting piece. The snap-fitting piece and the connecting notch are correspondingly arranged and located on one side of the air outlet. The snap-fitting piece is used to snap into the connecting notch when the first abutting step and the second abutting step abut against each other.

7. The low-noise fan according to claim 1, wherein: A positioning column is provided at the bottom of the first shell, and a positioning hole is provided at the top of the second shell. After the first shell and the second shell are connected, the positioning column extends into the positioning hole.

8. The low-noise fan according to claim 7, wherein: A connecting hole is provided in the positioning column, the connecting hole is communicated with the positioning hole, and is used for passing a connecting piece.

9. The low-noise fan according to claim 1, wherein: A connecting shaft is provided at the bottom of the wind wheel, and a through hole is provided in the second shell. After the wind wheel is installed in the installation cavity, the connecting shaft is inserted into the through hole.

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