Fan volute, fan and cleaning robot

Abstract

The application discloses a fan volute, a fan and a cleaning robot, wherein the fan volute comprises a volute body and a buffer convex part; the volute body has a shell cavity for rotation of an impeller, an annular air duct is formed between a side wall of the shell cavity and a peripheral edge of the impeller, an air outlet is formed on the side wall of the shell cavity, and a volute tongue is formed on the side wall of the shell cavity at the air outlet; the buffer convex part is arranged on the side wall of the shell cavity and extends from the volute tongue along the annular air duct in a direction away from the air outlet, so that airflow generated by rotation of the impeller and impacting on the volute tongue is guided along the buffer convex part in a direction away from the volute tongue. The technical scheme can weaken the superposition effect of airflow noise in the fan and effectively reduce the airflow noise.

Description

Technical Field

[0001] The present invention relates to the field of fans, and in particular to a fan volute, a fan and a cleaning robot. Background Art

[0002] Generally speaking, a centrifugal fan consists of a rotating impeller and a stationary volute.

[0003] In the traditional design, the airflow flowing out from different axial positions of the impeller outlet simultaneously impacts the point where the gap between the inner surface of the volute and the impeller is smallest (i.e., the junction of the volute tongue and the shell cavity), thereby superimposing a strong airflow noise (whose frequency is the product of the impeller rotation frequency and the number of blades).

[0004] In some applications, such as when the fan operates at a high speed and the minimum clearance between the volute and the impeller is small, traditional designs often face the problem of obvious airflow noise. Summary of the Invention

[0005] The main purpose of the present invention is to provide a fan volute, a fan and a sweeping robot, aiming to weaken the superposition effect of airflow noise in the fan to reduce the airflow noise.

[0006] To achieve the above object, the present invention provides a fan volute, comprising:

[0007] A volute body, the volute body having a shell cavity for rotating an impeller, an annular air duct formed between the side wall of the shell cavity and the periphery of the impeller, an air outlet opened on the side wall of the shell cavity, and a volute tongue formed on the side wall of the shell cavity at the air outlet;

[0008] A buffer convex portion is provided on the side wall of the shell cavity, extending from the volute tongue along the annular air duct in a direction away from the air outlet, so that the airflow generated by the rotation of the impeller and impacting the volute tongue is guided along the buffer convex portion in a direction away from the volute tongue.

[0009] Optionally, the buffer convex portion includes:

[0010] a buffer surface connected to the side wall of the shell cavity, extending from the volute tongue along the annular air duct, and used for bearing the impact of the airflow;

[0011] a base surface connected to the side wall of the shell cavity, extending from the volute tongue along the annular air duct, and disposed opposite to the buffer surface;

[0012] a supporting surface connected between the buffer surface and the base surface;

[0013] Wherein, as the volute tongue extends along the annular air duct, the distance between the buffer surface and the base surface in the axial direction gradually increases.

[0014] Optionally, the base surface is arranged to fit the bottom wall of the shell cavity.

[0015] Optionally, the buffer surface extends from the volute tongue along the annular air duct, and the width of the buffer surface in the radial direction of the impeller gradually decreases.

[0016] Optionally, the buffer surface is one of a curved surface, a flat surface, and a stepped surface, or a combination thereof.

[0017] Optionally, there are multiple buffer protrusions, and the multiple buffer protrusions are arranged in sequence and at intervals along the circumferential direction of the annular air duct.

[0018] Optionally, the volute body includes an upper volute and a lower volute, and the inner side wall of the upper volute and / or the lower volute is provided with the buffer protrusion.

[0019] Optionally, the number of the buffer protrusions is two, and the two buffer protrusions are provided on the upper volute and the lower volute;

[0020] The two buffer protrusions are symmetrically arranged on the plane where the upper volute and the lower volute are connected;

[0021] Alternatively, the buffer surfaces of the two buffer protrusions face the same side, the buffer surface is connected to the side wall of the shell cavity, extends from the volute tongue along the annular air duct, and is used to withstand the impact of airflow.

[0022] Optionally, the upper volute and the lower volute cover each other, and the joint between the upper volute and the lower volute is snap-fitted, welded or bonded.

[0023] Optionally, the inner side walls of the upper volute and the lower volute are respectively provided with buffer protrusions, the buffer protrusions of the upper volute and the buffer protrusions of the lower volute are symmetrically arranged on the plane where the upper volute and the lower volute are connected, and an end of the buffer protrusion of the upper volute away from the volute tongue is connected to an end of the buffer protrusion of the lower volute away from the volute tongue;

[0024] Alternatively, the buffer surfaces of the two buffer protrusions face the same side, and one end of the buffer protrusion of the upper volute away from the volute tongue and one end of the buffer protrusion of the lower volute away from the volute tongue are offset from each other.

[0025] To achieve the above objectives, the present invention also proposes a fan, which includes a fan volute, an impeller and a motor as described in any one of the above embodiments, wherein the impeller is rotatably arranged in the wind cavity of the fan volute, and the motor is transmission-connected to the impeller.

[0026] Optionally, the angle between the lines formed by connecting the end of the buffer protrusion close to the volute tongue and the end of the buffer protrusion away from the volute tongue and the rotation axis of the impeller is set to a first angle, and the angle between the lines formed by connecting the tips of two adjacent blades on the impeller and the rotation axis of the impeller is set to a second angle;

[0027] Wherein, the first angle is greater than or equal to the second angle.

[0028] To achieve the above-mentioned object, the present invention further provides a cleaning robot, which includes the blower described in any one of the above embodiments.

[0029] In the technical solution of the present invention, the buffer convex portion protrudes from the circumferential side wall of the shell cavity of the volute body, and extends from the volute tongue along the annular air duct in the direction away from the air outlet. In this way, the airflow generated by the rotation of the impeller and impacting the volute tongue can be guided along the extension direction of the buffer convex portion, and impact different parts of the buffer convex portion according to different time delays, thereby overcoming the problem of strong airflow noise superimposed by airflows of different axial heights simultaneously impacting the junction of the volute tongue and the shell cavity (the minimum gap in the annular air duct) in traditional fans. The superposition effect of airflow noise can be weakened without affecting the performance of the fan, thereby effectively reducing the airflow noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of a fan of the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the lower volute of the fan;

[0033] Figure 3 for Figure 1 Schematic diagram of the structure of the upper volute of the fan;

[0034] Figure 4 for Figure 3 A top view of

[0035] Figure 5 for Figure 1 Schematic diagram of the structure of the fan assembly clamp;

[0036] Figure 6 for Figure 5Schematic diagram of the structure of the fan with the clamp removed;

[0037] Figure 7 for Figure 6 Schematic diagram of the fan structure from another perspective;

[0038] Figure 8 for Figure 5 Schematic diagram of the structure of the clamp.

[0039] Description of Figure Numbers:

[0040] Label name Label name 100 fan 131 buffer surface 10 Fan volute 132 Support surface 11 Upper volute 20 impeller 111 air inlet 21 blade 112 air outlet 30 Clamps 113 Annular air duct 31 Clamping part 114 Cochlear tongue 311 Card convex 115 card slot 3111 Connection end 116 Snap-on protrusion 3112 Extension end 117 Second positioning protrusion 32 Connection 12 Lower volute 321 First positioning groove 121 Card Block 33 Bending section 13 Buffer convex part 40 seals

[0041] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The present invention provides a fan volute 10 .

[0046] In the embodiment of the present invention, Figure 1As shown, the fan volute 10 includes a volute body and a buffer protrusion 13; the volute body has a shell cavity for the impeller 20 to rotate, and an annular air duct 113 is formed between the side wall of the shell cavity and the periphery of the impeller 20, an air outlet 112 is opened on the side wall of the shell cavity, and a volute tongue 114 is formed on the side wall of the shell cavity at the air outlet 112; the buffer protrusion 13 is provided on the side wall of the shell cavity, extending from the volute tongue 114 along the annular air duct 113 in a direction away from the air outlet 112, so that the airflow generated by the rotation of the impeller 20 and impacting the volute tongue 114 is guided along the buffer protrusion 13 in a direction away from the volute tongue 114.

[0047] Specifically, according to the needs of the process, the volute body can be an integrally formed part or a component composed of two parts, the upper volute 11 and the lower volute 12, which is not limited by the present invention. It is easy to understand that in addition to the air outlet 112 connected to the annular air duct 113 provided on the side wall of the shell cavity, the volute body is also provided with an air inlet 111 connected to the annular air duct 113 on the bottom wall of the shell cavity. Among them, the impeller 20 is installed in the shell cavity and driven by a motor. When the impeller 20 rotates, it draws the outside air into the shell cavity from the air inlet 111, thereby generating an air flow, which flows and converges along the annular air duct 113 and finally flows out from the air outlet 112. Among them, due to the structure of the annular air duct 113, part of the air flow will impact the volute tongue 114 and flow back into the annular air duct 113. The specific structure of the volute body can adopt the existing technology and will not be repeated here.

[0048] In the technical solution of the present invention, the buffer protrusion 13 protrudes from the circumferential side wall of the shell cavity of the volute body, and extends from the volute tongue 114 along the annular air duct 113 in the direction away from the air outlet 112. In this way, the airflow generated by the rotation of the impeller 20 and impacting the volute tongue 114 can be guided along the extension direction of the buffer protrusion 13, and impact different parts of the buffer protrusion 13 according to different time delays, thereby overcoming the problem of strong airflow noise superimposed due to the simultaneous impact of airflows of different axial heights on the junction of the volute tongue 114 and the shell cavity (the minimum gap of the annular air duct 113) in the traditional fan 100. The superposition effect of airflow noise can be weakened without affecting the performance of the fan 100, thereby effectively reducing the airflow noise.

[0049] As an alternative implementation, see Figure 1The buffer protrusion 13 includes a buffer surface 131, a base surface (not shown), and a support surface 132. The buffer surface 131 is connected to the side wall of the shell cavity, extends from the volute tongue 114 along the annular air duct 113, and is used to withstand the impact of the airflow. The base surface is connected to the side wall of the shell cavity, extends from the volute tongue 114 along the annular air duct 113, and is arranged opposite to the buffer surface 131. The support surface 132 is connected between the buffer surface 131 and the base surface. The distance between the buffer surface 131 and the base surface in the axial direction gradually increases from the volute tongue 114 along the annular air duct 113. It should be noted that the axial direction here refers to the extension direction of the rotation axis of the impeller 20.

[0050] In this embodiment, the buffer protrusion 13 is integrally formed on the side wall of the shell cavity of the volute body. The surface of the buffer protrusion 13 may include a base surface, a support surface 132, and a buffer surface 131 connected in sequence, and the base surface, the support surface 132, and the buffer surface 131 are all connected to the side wall of the shell cavity, so that the buffer protrusion 13 forms a closed entity. Among them, since the buffer surface 131 and the base surface extend from the volute tongue 114 along the annular air duct 113, the distance between the buffer surface 131 and the base surface in the axial direction of the impeller 20 gradually increases. When the airflow generated by the rotation of the impeller 20 flows along the annular air duct 113 and impacts the junction of the volute tongue 114 and the shell cavity (the minimum gap of the annular air duct 113), the airflow at different axial heights of the impeller 20 will be guided along the buffer surface 131 of the buffer protrusion 13 and impact different areas of the buffer surface 131 in the circumferential direction according to different time delays. This can prevent airflows at different axial heights from simultaneously impacting the volute tongue 114 and superimposing strong airflow noise, and can weaken the superposition effect of airflow noise, thereby effectively reducing airflow noise.

[0051] It is understandable that the base surface and the bottom of the upper volute 11 or the lower volute 12 may be spaced apart, which is not specifically limited herein.

[0052] As an alternative implementation, see Figure 1 The base surface is fitted with the bottom wall of the shell cavity.

[0053] In this embodiment, the base surface of the buffer protrusion 13 is arranged parallel to the bottom wall of the shell cavity and directly fits with the bottom wall of the shell cavity. In this way, the molding surface of the buffer protrusion 13 can be reduced, which is conducive to the integral molding of the buffer protrusion 13 and the volute body, reduces the processing difficulty, and facilitates production. Moreover, when the buffer protrusion 13 extends from the volute tongue 114 along the annular air duct 113, when the axial height of the buffer surface 131 of the buffer protrusion 13 from the bottom wall of the shell cavity gradually changes, the extension length of the buffer protrusion 13 in this embodiment can be set to be longer, which can further enhance the buffering effect of the buffer protrusion 13 on the airflow, weaken the superposition effect of the airflow noise, and thus effectively reduce the airflow noise.

[0054] As an alternative implementation, see Figure 1The width of the buffer surface 131 gradually decreases along the annular air duct 113 from the volute tongue 114 in the radial direction of the impeller 20. It should be noted that the radial direction here refers to the direction perpendicular to the rotation axis of the impeller 20 extending outward.

[0055] In this embodiment, the width of the buffer surface 131 gradually changes from large to small in the direction away from the volute tongue 114, and finally joins with the side wall of the shell cavity. On the one hand, the width of the buffer protrusion 13 near the end of the volute tongue 114 is larger, which can withstand more airflow impacting the volute tongue 114. As the airflow is guided along the buffer protrusion 13 and impacts different areas of the buffer surface 131, the airflow gradually decreases, and the width of the buffer protrusion 13 also gradually decreases accordingly. On the other hand, through the above-mentioned arrangement, the annular air duct 113 (the gap between the side wall of the shell cavity and the impeller 20) can change from small to large along the radial direction of the impeller 20 when it circulates from the volute tongue 114 to the air outlet 112. This is conducive to the airflow generated by the rotation of the impeller 20 flowing along the annular air duct 113 and converging to flow out of the air outlet 112.

[0056] As an alternative implementation, see Figure 1 The buffer surface 131 is one of a curved surface, a flat surface, a stepped surface, or a combination thereof.

[0057] The present invention does not limit the bevel angle of the buffer surface 131 of the buffer convex portion 13. In a preferred embodiment, the buffer surface 131 is an inclined plane, which can simplify the structure of the buffer convex portion 13 and facilitate the integral molding of the buffer convex portion 13 and the volute body for easy production.

[0058] It is understandable that when the buffer surface 131 is a curved surface and / or a stepped surface, the area of ​​the curved surface and / or the stepped surface impacted by the airflow can be increased, thereby further avoiding the superposition of strong airflow noise.

[0059] As an optional embodiment, there are multiple buffer protrusions 13 , and the multiple buffer protrusions 13 are sequentially spaced apart along the circumferential direction of the annular air duct 113 .

[0060] In order to further improve the noise reduction effect, this embodiment is provided with a plurality of buffer protrusions 13 in the circumferential direction of the annular air duct 113. In this way, when the impeller 20 rotates to generate airflow and flows along the annular air duct 113, each buffer protrusion 13 can guide the airflow in each area within the annular air duct 113, further weakening the superposition effect of the airflow noise, thereby effectively reducing the airflow noise.

[0061] As an alternative implementation, see Figure 1 The volute body includes an upper volute 11 and a lower volute 12 , and a buffer protrusion 13 is provided on the inner side wall of the upper volute 11 and / or the lower volute 12 .

[0062] As a split structure, the volute body includes an upper volute 11 and a lower volute 12. The upper volute 11 is provided with an air inlet 111. The upper volute 11 and the lower volute 12 cover each other and form a shell cavity therebetween. The side walls of the upper volute 11 and the lower volute 12 are jointly provided with an air outlet 112. The buffer convex portion 13 can be selectively provided on the upper volute 11 and / or the lower volute 12 according to actual needs: for example, the buffer convex portion 13 is provided only on the inner side wall of the upper volute 11; for another example, the buffer convex portion 13 is provided only on the inner side wall of the lower volute 12; for another example, a buffer convex portion 13 is provided on both the upper volute 11 and the lower volute 12, and the buffer convex portion 13 extends from the upper volute 11 to the lower volute 12; for another example, a buffer convex portion 13 is provided on each of the upper volute 11 and the lower volute 12.

[0063] As an optional embodiment, the upper volute 11 and the lower volute 12 cover each other, and the joint between the upper volute 11 and the lower volute 12 is clamped, welded or bonded.

[0064] As a split structure, when the upper volute 11 and the lower volute 12 are covered with each other to form a fan volute 10, the annular edge of the upper volute 11 and the annular edge of the lower volute 12 are connected to each other. The specific connection method can be set according to actual needs. For example, a clamping structure (such as a clamping structure) that can be clamped to each other is provided on the annular edge of the upper volute 11 and the annular edge of the lower volute 12. Figure 1 As shown, the edge of the upper volute 11 is provided with a card groove 115, and the edge of the lower volute 12 is provided with a corresponding card block 121), so that the upper volute 11 and the lower volute 12 are clamped and fixed; for example, adhesive is applied to the annular edge of the upper volute 11 and the annular edge of the lower volute 12, so that the upper volute 11 and the lower volute 12 are bonded and fixed; for example, the annular edge of the upper volute 11 and the annular edge of the lower volute 12 are ultrasonically welded together by an ultrasonic welding machine, so that the upper volute 11 and the lower volute 12 are fixed to each other.

[0065] In the preferred embodiment, please refer to Figures 1 to 4 There are two buffer protrusions 13, each provided on the inner sidewall of the upper volute 11 and the lower volute 12. The buffer protrusions 13 of the upper volute 11 and the buffer protrusions 13 of the lower volute 12 are symmetrically arranged about the plane where the upper volute 11 and the lower volute 12 are connected. Furthermore, the end of the buffer protrusion 13 of the upper volute 11 away from the volute tongue 114 is connected to the end of the buffer protrusion 13 of the lower volute 12 away from the volute tongue 114.

[0066] In this embodiment, the airflow impacting the volute tongue 114 is simultaneously guided by the buffer protrusion 13 of the upper volute 11 and the buffer protrusion 13 of the lower volute 12, so that the airflow can be guided separately along the buffer protrusion 13 of the upper volute 11 and the buffer protrusion 13 of the lower volute 12, and the airflow impacts different parts of the buffer protrusion 13 of the upper volute 11 and different parts of the buffer protrusion 13 of the lower volute 12 according to different time delays, thereby overcoming the problem of strong airflow noise in the traditional fan 100 caused by the airflow of different axial heights simultaneously impacting the junction of the volute tongue 114 and the shell cavity (the minimum gap of the annular air duct 113). Compared with a single buffer protrusion 13, the two relative buffer protrusions 13 in this embodiment can achieve a double vibration reduction effect, more significantly weaken the superposition effect of airflow noise, and effectively reduce airflow noise. Among them, the buffer protrusion 13 of the upper volute 11 and the buffer protrusion 13 of the lower volute 12 are connected at the volute tongue 114, so that the extension length of the buffer protrusion 13 of the upper volute 11 and the extension length of the buffer protrusion 13 of the lower volute 12 can be set longer to maximize the noise reduction effect.

[0067] As an alternative implementation, see Figures 1 to 4 The inner sidewalls of the upper and lower volutes 11, 12 are each provided with a buffering protrusion 13. The buffering surfaces 131 of the two buffering protrusions 13 face the same side. The buffering surfaces 131 are connected to the sidewalls of the housing cavity and extend from the volute tongue 114 along the annular air duct 113 to withstand the impact of the airflow. Furthermore, the end of the buffering protrusion 13 of the upper volute 11 away from the volute tongue 114 is offset from the end of the buffering protrusion 13 of the lower volute 12 away from the volute tongue 114.

[0068] Specifically, taking the lower volute 12 as an example, the base surface of the buffer protrusion 13 of the lower volute 12 is arranged to fit the inner bottom wall of the lower volute 12. As the buffer surface 131 of the buffer protrusion 13 of the lower volute 12 extends from the volute tongue 114 along the annular air duct 113, it gradually approaches the upper volute 11. When the airflow flowing out of the annular air duct 113 impacts the lower half of the volute, airflows at different heights will be guided along the buffer surface 131 of the buffer protrusion 13 of the lower volute 12 and impact different areas of the buffer surface 131 of the lower volute 12 in the circumferential direction according to different time delays. This can prevent airflows at different axial heights from simultaneously impacting the volute tongue 114 and generating strong airflow noise. This can weaken the superposition effect of airflow noise, thereby effectively reducing airflow noise.

[0069] The present invention also provides a fan 100, such as Figure 1As shown, the fan 100 includes a fan volute 10, an impeller 20, and a motor (not shown). The specific structure of the fan volute 10 is similar to the above-mentioned embodiments. Since the fan 100 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here. Among them, the impeller 20 is rotatably disposed in the air cavity of the fan volute 10, and the motor is drivingly connected to the impeller 20.

[0070] As a preferred embodiment, see Figure 2 The angle between the lines formed by connecting one end of the buffer protrusion 13 close to the volute tongue 114 and the other end of the buffer protrusion 13 away from the volute tongue 114 with the rotation axis of the impeller 20 is set to a first angle θ1, and the angle between the lines formed by connecting the ends of two adjacent blades 21 on the impeller 20 with the rotation axis of the impeller 20 is set to a second angle θ2; wherein the first angle θ1 is greater than or equal to the second angle θ2 (that is, θ1≥θ2).

[0071] Specifically, when the impeller 20 rotates, the airflow flows out from between two adjacent blades 21 on the impeller 20, flows along the annular channel, and finally flows out from the air outlet 112. Part of the airflow impacts the junction between the volute tongue 114 and the shell cavity (the minimum gap of the annular air duct 113). By setting the span of the buffer protrusion 13 to be greater than or equal to the air outlet angle between any two adjacent blades 21 on the impeller 20, the buffer protrusion 13 can effectively buffer and guide the airflow, so that airflows of different axial heights impact different areas of the buffer surface 131 of the buffer protrusion 13 in the circumferential direction, thereby weakening the superposition effect of airflow noise, reducing airflow noise, and avoiding the limitation of the noise reduction effect due to the excessively short extension length of the buffer protrusion 13.

[0072] In one embodiment, see Figures 5 to 7 The fan volute 10 is provided with a clamp 30; the clamp 30 includes two clamping portions 31 that are opposite and spaced apart, and a connecting portion 32 (such as Figure 8 wherein the two clamping portions 31 clamp the upper volute 11 and the lower volute 12 of the fan volute 10 so that the upper volute 11 and the lower volute 12 are clamped to each other (as shown in FIG. Figure 5 shown).

[0073] Specifically, the clamp 30 has a certain elastic deformation capability. For example, the clamp 30 can be stamped from a spring steel sheet to form a sheet-like clamping portion 31 and a sheet-like connecting portion 32, wherein the two clamping portions 31 are symmetrically arranged about the connecting portion 32.

[0074] When the motor drives the impeller 20 to rotate, it causes the upper volute 11 and the lower volute 12 to vibrate, resulting in noise. In the technical solution of the present invention, a clamp 30 is used to clamp between the upper volute 11 and the lower volute 12 of the fan volute 10. Specifically, one clamping portion 31 of the clamp 30 is in close contact with the surface of the upper volute 11, and the other clamping portion 31 of the clamp 30 is in close contact with the surface of the lower volute 12. The elastic action of the clamp 30 clamps the upper volute 11 and the lower volute 12 together.

[0075] Among them, the upper volute 11 and the lower volute 12 themselves have a certain fixed frequency. When the clamp 30 tightens the upper volute 11 and the lower volute 12, the assembly stability between the upper volute 11 and the lower volute 12 is improved, and the structure of the fan volute 10 is strengthened. When the motor drives the impeller 20 to rotate, vibration and noise will be generated. After the vibration is transmitted to the upper volute 11 and the lower volute 12, the elastic properties of the clamp 30 are used to enhance the natural frequency of the upper volute 11 and the lower volute 12, so as to buffer the vibration and reduce the noise, so that the vibration peak of the upper volute 11 and the lower volute 12 is reduced, and the modal frequency of the upper volute 11 and the lower volute 12 is greatly improved, thereby effectively improving the vibration and noise problem of the product.

[0076] In one embodiment, see Figure 8 A bending portion 33 is provided at the connection between the clamping portion 31 and the connecting portion 32 , and the bending portion 33 bends from the connecting portion 32 toward the clamping portion 31 .

[0077] Specifically, the bend 33 between the clamping portion 31 and the connecting portion 32 can be arc-shaped, and the arc-shaped bend 33 protrudes toward the intersection of the extending surfaces of the clamping portion 31 and the connecting portion 32. By providing a curved bend 33 between the planar clamping portion 31 and the planar connecting portion 32, the elastic deformation capability of the clamp 30 can be enhanced. In particular, the bending angle of the bend 33 can help adjust the clamping capacity of the clamp 30. As the clamping force of the clamp 30 increases, the clamp 30 exerts a stronger rigidity on the fan volute 10, resulting in a higher natural frequency, thereby more effectively improving the vibration and noise issues of the product.

[0078] Further, see Figure 8 The clamping portion 31 includes a plurality of latching protrusions 311 , and the plurality of latching protrusions 311 are arranged at intervals on the edge of the connecting portion 32 .

[0079] In order to further improve the clamping force of the clamp 30 on the fan volute 10, the technical solution sets the clamping part 31 as a plurality of spaced-apart clamping protrusions 311, and the clamping protrusions 311 are bent and protruded in the direction of the other clamping part 31. When the clamping part 31 of the clamp 30 is attached to the surfaces of the upper volute 11 and the lower volute 12 of the fan volute 10, the clamp 30 contacts the surfaces of the upper volute 11 and the lower volute 12 through the plurality of clamping protrusions 311, and can concentrate the clamping force on each clamping protrusion 311, so that the clamping part 30 clamps the fan volute 10 more firmly and powerfully, and makes the natural frequency of the fan volute 10 higher, so as to further improve the vibration and noise problem of the product.

[0080] Specifically, see Figure 8 The clamping protrusion 311 includes a connecting end 3111 and an extending end 3112. The connecting end 3111 is connected to the connecting portion 32 and is bent in a direction toward the other clamping portion 31. The extending end 3112 is connected to a side of the connecting end 3111 away from the connecting portion 32 and is bent in a direction away from the other clamping portion 31.

[0081] In this embodiment, in order to cooperate with the use of the clamping protrusion 311, the upper volute 11 and / or the lower volute 12 are provided with a clamping groove 115 or a clamping protrusion 116 (such as Figures 6 to 7 As shown), when the clamp 30 clamps the fan volute 10, the portion where the connecting end 3111 and the extending end 3112 of the clamp 30 are connected clamps the clamping groove 115 or the clamping protrusion 116 (as shown Figure 5 As shown), the clamping member 30 can clamp the fan volute 10 more firmly and powerfully, and the natural frequency of the fan volute 10 can be higher, so as to further improve the vibration and noise problem of the product.

[0082] Optionally, see Figure 8 The connecting portion 32 is provided with a first positioning groove 321 and / or a first positioning protrusion.

[0083] When the clamp 30 is clamped on the fan volute 10, the impeller 20 in the fan volute 10 is in operation and vibration is generated. The vibrating fan volute 10 may cause displacement between the clamp 30 and the fan volute 10, resulting in a deviation in the relative position between the clamp 30 and the fan volute 10, which will weaken the vibration and noise reduction effect. In this technical solution, a first positioning groove 321 and / or a first positioning protrusion (such as Figure 8 As shown), accordingly, the upper volute 11 and / or the lower volute 12 of the fan volute 10 are provided with a second positioning protrusion 117 that cooperates with the first positioning groove 321 or a second positioning groove (as shown) that cooperates with the first positioning protrusion Figure 5By the cooperation between the first positioning groove 321 and the second positioning protrusion 117, or the cooperation between the first positioning protrusion and the second positioning groove, the clamp 30 can be positioned in a fixed position of the fan volute 10 (as shown). Figure 5 As shown), the clamp 30 can ensure the vibration and noise reduction effect on the fan volute 10.

[0084] Further, see Figure 8 The connecting portion 32 is connected to the clamping portion 31 on both sides parallel to the length direction, and the connecting portion 32 is provided with a first positioning groove 321 and / or a first positioning protrusion on both sides perpendicular to the length direction.

[0085] In this embodiment, a plurality of clamping protrusions 311 are provided on the edge of the connecting portion 32 parallel to the length direction, and the first positioning groove 321 and / or the first positioning protrusion are provided on the edge of the connecting portion 32 perpendicular to the length direction. The first positioning groove 321 can be a semicircular groove, and the first positioning protrusion can be a semicircular protrusion. By positioning the clamp 30 on both sides of the length direction of the connecting portion 32 (such as Figure 5 (as shown), the positioning of the clamp 30 can be made more stable, so that the clamp 30 is fixed in a fixed position on the fan volute 10, thereby ensuring the vibration and noise reduction effect of the clamp 30 on the fan volute 10. Furthermore, to facilitate manufacturing, the first positioning grooves 321 and / or first positioning protrusions on both sides of the connecting portion 32 in the longitudinal direction can be symmetrically arranged.

[0086] Optionally, the clamp 30 is made by stamping a metal sheet; or, the clamp 30 is made by bending and winding a metal wire.

[0087] The clamp 30 can be manufactured in a variety of ways. For example, it can be stamped from spring steel sheets, which simplifies the process, is easy to manufacture, and is suitable for large-scale applications. Alternatively, the clamp 30 can be formed by bending and rewinding spring steel wire to create a similar structure. This design enhances elastic deformation, strengthens clamping capabilities, and improves vibration and noise reduction.

[0088] In one embodiment, see Figure 5 The fan volute 10 includes a centrifugal portion and an air outlet portion, and the clamping portion 31 is located at the air outlet portion.

[0089] After the upper volute 11 and lower volute 12 of the fan volute 10 are joined, the portion containing the housing cavity forms a centrifugal portion. An outlet passage extends between the housing cavity and the air outlet 112, and the portion containing the outlet passage forms the outlet portion. The clamp 30 is clamped to the portion of the fan volute 10 where the outlet passage is located. This is primarily because the outlet portion is the space where the annular airflow converges and flows through. The impact of the airflow on the outlet portion causes the strongest vibration in the entire fan volute 10. When the clamp 30 is clamped to the outlet portion of the fan volute 10, it maximizes the vibration and noise reduction effects.

[0090] Optionally, see Figure 8 The clamping portion 31 includes a plurality of clamping protrusions 311, and the clamping protrusions 311 include a connecting end 3111 and an extending end 3112. The connecting end 3111 is connected to the connecting portion 32, and the extending end 3112 is connected to the side of the connecting end 3111 away from the connecting portion 32. The portion where the connecting end 3111 and the extending end 3112 are connected is bent in a direction away from the connecting portion 32; a clamping groove 115 or a clamping protrusion 116 (such as Figures 6 to 7 As shown), the portion where the connecting end 3111 and the extending end 3112 are connected is the clamping groove 115 or the clamping protrusion 116 (as shown Figure 8 shown).

[0091] In this embodiment, the clamping portion 31 of the clamp 30 is set to a plurality of spaced-apart clamping protrusions 311. To cooperate with the use of the clamping protrusions 311, a clamping groove 115 or a clamping protrusion 116 is provided on the upper volute 11 and / or the lower volute 12. When the clamp 30 clamps the fan volute 10, the part where the connecting end 3111 and the extension end 3112 of the clamp 30 are connected clamps the clamping groove 115 or the clamping protrusion 116. The clamp 30 contacts the surface of the upper volute 11 and the lower volute 12 through the plurality of clamping protrusions 311, and can concentrate the clamping force on each clamping protrusion 311, so that the clamp 30 can clamp the fan volute 10 more firmly and powerfully, and make the natural frequency of the fan volute 10 higher, so as to further improve the vibration and noise problem of the product.

[0092] Optionally, see Figures 5 to 7 , a first positioning groove 321 and / or a first positioning protrusion is provided on the connecting portion 32; the upper volute 11 and / or the lower volute 12 is provided with a second positioning protrusion 117 that cooperates with the first positioning groove 321 or a second positioning groove (such as Figure 6 shown).

[0093] When the clamp 30 is clamped on the fan volute 10, the impeller 20 inside the fan volute 10 is in operation, which generates vibration. The vibrating fan volute 10 may cause displacement between the clamp 30 and the fan volute 10, resulting in a deviation in the relative position between the clamp 30 and the fan volute 10, which will weaken the vibration reduction and noise reduction effect. In this embodiment, a first positioning groove 321 and / or a first positioning protrusion are provided on the connecting portion 32 of the clamp 30. Accordingly, a second positioning protrusion 117 that cooperates with the first positioning groove 321 or a second positioning groove that cooperates with the first positioning protrusion is provided on the upper volute 11 and / or lower volute 12 of the fan volute 10. Through the cooperation of the first positioning groove 321 and the second positioning protrusion 117, or the cooperation of the first positioning protrusion and the second positioning groove, the clamp 30 can be positioned in a fixed position on the fan volute 10, thereby ensuring the vibration reduction and noise reduction effect of the clamp 30 on the fan volute 10.

[0094] Optionally, a first air outlet slot is provided on the side wall of the upper volute 11, and a second air outlet slot is provided on the side wall of the lower volute 12. The first air outlet slot and the second air outlet slot are combined to form an air outlet channel. A seal 40 is sleeved on the outer walls of the upper volute 11 and the lower volute 12 where the air outlet channel is located.

[0095] In this embodiment, the seal 40 is elastic and can be a rubber sleeve. When the air outlet of the fan volute 10 is connected to other components, the seal 40 is sleeved on the air outlet to achieve a sealing function, tightly connecting the air outlet with other components and ensuring the air outlet effect. In addition, the elastic seal 40 can also partially attenuate vibration noise.

[0096] The present invention also proposes a cleaning robot, which includes a fan 100. The specific structure of the fan 100 refers to the above embodiment. Since this cleaning robot adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0097] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fan volute, characterized in that: The fan volute comprises: A volute body, the volute body having a shell cavity for rotating an impeller, an annular air duct formed between the side wall of the shell cavity and the periphery of the impeller, an air outlet opened on the side wall of the shell cavity, and a volute tongue formed on the side wall of the shell cavity at the air outlet; a buffer convex portion, the buffer convex portion being provided on a side wall of the shell cavity and extending from the volute tongue along the annular air duct in a direction away from the air outlet, so as to guide the airflow generated by the rotation of the impeller and impacting the volute tongue along the buffer convex portion in a direction away from the volute tongue; The volute body includes an upper volute and a lower volute, and the inner side walls of the upper volute and the lower volute are respectively provided with the buffer protrusion; The buffer protrusion of the upper volute and the buffer protrusion of the lower volute are symmetrically arranged on the plane where the upper volute and the lower volute are connected, and the end of the buffer protrusion of the upper volute away from the volute tongue is connected to the end of the buffer protrusion of the lower volute away from the volute tongue; or, the buffer surface of the buffer protrusion of the upper volute and the buffer surface of the buffer protrusion of the lower volute face the same side, and the end of the buffer protrusion of the upper volute away from the volute tongue and the end of the buffer protrusion of the lower volute away from the volute tongue are staggered with each other; When the volute tongue extends along the annular air duct, the axial height of the buffer surface of the buffer protrusion from the bottom wall of the shell cavity gradually changes.

2. The fan volute according to claim 1, characterized in that: The buffer convex portion includes: a buffer surface connected to the side wall of the shell cavity, extending from the volute tongue along the annular air duct, and used for bearing the impact of the airflow; a base surface connected to the side wall of the shell cavity, extending from the volute tongue along the annular air duct, and disposed opposite to the buffer surface; a supporting surface connected between the buffer surface and the base surface; Wherein, as the volute tongue extends along the annular air duct, the distance between the buffer surface and the base surface in the axial direction gradually increases.

3. The fan volute according to claim 2, characterized in that: The base surface is arranged in contact with the bottom wall of the shell cavity.

4. The fan volute according to claim 2, wherein: The width of the buffer surface in the radial direction of the impeller gradually decreases as it extends from the volute tongue along the annular air duct.

5. The fan volute according to claim 2, characterized in that: The buffer surface is one of a curved surface, a flat surface, and a stepped surface, or a combination thereof.

6. The fan volute according to claim 1, characterized in that: There are multiple buffer convex portions, and the multiple buffer convex portions are sequentially spaced apart along the circumferential direction of the annular air duct.

7. The fan volute according to claim 1, wherein: The upper volute and the lower volute cover each other, and the joint between the upper volute and the lower volute is clamped, welded or bonded.

8. A fan, characterized in that: The fan comprises a fan volute as claimed in any one of claims 1 to 7, an impeller and a motor, the impeller being rotatably disposed in an air cavity of the fan volute, and the motor being transmission-connected to the impeller.

9. The fan according to claim 8, characterized in that The angle between the lines connecting the end of the buffer protrusion close to the volute tongue and the end of the buffer protrusion away from the volute tongue and the rotation axis of the impeller is set to a first angle, and the angle between the lines connecting the ends of two adjacent blades on the impeller and the rotation axis of the impeller is set to a second angle; Wherein, the first angle is greater than or equal to the second angle.

10. A cleaning robot, characterized in that: The cleaning robot comprises the blower according to claim 8 or 9.

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