Volute and fan assembly with same

Abstract

The volute comprises a volute body, a fan cavity is formed in the volute body, an air inlet communicated with the fan cavity is formed in one axial end of the volute body, and a mounting hole of a motor is formed in the other axial end of the volute body. A silencing cavity surrounding the mounting hole is formed in the side wall of the end, away from the air inlet, of the volute body, and an open hole communicating with the silencing cavity is formed in the inner wall face of the end, away from the air inlet, of the fan cavity. According to the volute, the silencing cavity surrounding the mounting hole is formed in the side wall of the end, away from the air inlet, of the volute body, the open hole communicating with the silencing cavity is formed in the inner wall face of the end, away from the air inlet, of the fan cavity, and airflow sound waves in the fan cavity can enter the silencing cavity through the open hole; the sound waves are reflected when reaching the closed boundary of the silencing cavity, and the reflected sound waves can be superposed and offset with incident sound waves with opposite phases under the same frequency, so that a good silencing effect can be achieved, and the use experience of a user is enhanced.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of fans, and in particular to a volute and a fan assembly having the same. Background Art

[0002] Various types of fans have been widely used in devices, equipment or systems such as air conditioners, purifiers, refrigerators, etc., bringing convenience to people's work and daily life. In the prior art, a large number of fan products have been provided to meet different application requirements. The rotation of the fan will generate a lot of noise, which is easy to affect the user experience. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a volute, which can achieve good noise reduction effect and enhance the user's experience.

[0004] The present invention also provides a fan assembly, the fan assembly comprising the above-mentioned volute

[0005] According to an embodiment of the present invention, the volute includes a volute body. The volute body has a fan cavity, one axial end of the volute body has an air inlet connected to the fan cavity, and the other axial end has a motor mounting hole, a muffler cavity is provided in the side wall of the end of the volute body away from the air inlet, and an opening connected to the muffler cavity is provided on the inner wall surface of the end of the fan cavity away from the air inlet, and the muffler cavity includes a first muffler cavity, the first muffler cavity is a circular ring arranged around the mounting hole, the first muffler cavity includes a plurality of first sub-muffler cavities spaced apart, the first sub-muffler cavity includes a plurality of second sub-muffler cavities, the plurality of second sub-muffler cavities are arranged in the radial direction of the first muffler cavity and are connected to each other, each of the second sub-muffler cavities extends along the circumferential direction of the first muffler cavity, and each of the first sub-muffler cavities has the opening connected to the fan cavity on the wall surface facing the fan cavity.

[0006] According to the volute of the embodiment of the present invention, a fan cavity is arranged in the volute body, a fan is installed in the fan cavity, a motor is used to drive the fan to rotate, and under the action of the fan, the airflow enters the fan cavity from the air inlet. A muffler cavity is provided in the side wall of the end of the volute body away from the air inlet, the muffler cavity includes a first muffler cavity arranged around the mounting hole, the first muffler cavity includes a plurality of first sub-muffler cavities spaced apart, the first sub-muffler cavity includes a plurality of second sub-muffler cavities arranged in the radial direction of the first muffler cavity and interconnected, each first sub-muffler cavity has an opening connected to the fan cavity on the wall surface facing the fan cavity, the airflow sound waves in the fan cavity can enter the plurality of first sub-muffler cavities through the opening, and flow along the second sub-muffler cavity directly entered, and are reflected at the circumferential edge of the second sub-muffler cavity to the second sub-muffler cavity adjacent and connected in the radial direction, the airflow sound waves are reflected in the plurality of second sub-muffler cavities, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good muffler effect and enhance the user experience.

[0007] In some embodiments of the present invention, at least one end of two adjacent second sub-muffler cavities among the plurality of second sub-muffler cavities within the same first sub-muffler cavity along the circumferential direction of the first muffler cavity is flush or uneven.

[0008] In some embodiments of the present invention, the volute further includes: a first sealing rib and a second sealing rib. The first sealing rib is arranged in the first silencer cavity, the first sealing rib is annular and arranged around the mounting hole, and the first sealing rib is a plurality of ribs arranged at intervals along the radial direction of the first silencer cavity, and the first silencer cavity is defined between the two first sealing ribs located at the outermost and innermost sides of the first silencer cavity in the radial direction; a plurality of second sealing ribs arranged at intervals along the circumferential direction of the first silencer cavity are arranged between any two adjacent first sealing ribs, and the plurality of first sealing ribs and the plurality of second sealing ribs jointly define a plurality of second sub-silencer cavities, and the first sealing rib between two adjacent second sub-silencer cavities in the same first sub-silencer cavity has a notch connecting the two second sub-silencer cavities.

[0009] In some embodiments of the present invention, the notch is located at one end of the first sealing rib located inside the first sub-muffler chamber along the circumferential direction of the first muffler chamber.

[0010] In some embodiments of the present invention, when the number of the second sub-silence chambers in the same first sub-silence chamber is greater than or equal to 3, the two notches connecting the three adjacent second sub-silence chambers are respectively located at the two ends of the parts of the two first sealing ribs located in the first sub-silence chamber along the circumferential direction of the first silencer chamber.

[0011] In some embodiments of the present invention, each opening connecting the first sub-muffler chamber to the fan chamber connects to the outermost second sub-muffler chamber or the innermost second sub-muffler chamber in the first sub-muffler chamber along the radial direction of the first muffler chamber.

[0012] In some embodiments of the present invention, along the circumferential direction of the first silencing cavity, the opening is located at an end of the second sub-silencing cavity away from the notch.

[0013] In some embodiments of the present invention, the width between two adjacent first sealing ribs is 4-14 mm; and / or the thickness of the first sealing rib is 0.6-2.5 mm; and / or the thickness of the second sealing rib is 0.6-2.5 mm.

[0014] In some embodiments of the present invention, the width between two adjacent first sealing ribs is Wc, and the thickness of the first sealing rib is h. c , the outer diameter of the first sealing rib located at the radially outermost side of the first muffler cavity among the plurality of first sealing ribs is D, the inner diameter of the first sealing rib located at the radially innermost side of the first muffler cavity among the plurality of first sealing ribs is d, and the following conditions are satisfied:

[0015] N c +(N+1)h c =0.5(Dd)

[0016] Wherein, N is a positive integer greater than or equal to 4.

[0017] In some embodiments of the present invention, the number of the first sub-muffler chambers is greater than or equal to ten.

[0018] In some embodiments of the present invention, a high-speed airflow zone is provided on the inner wall of the fan cavity on the side facing away from the air inlet, and at least one of the two ends of the second sub-muffler cavity located at the outermost radial direction of the first muffler cavity in the first sub-muffler cavity along the circumferential direction of the first muffler cavity and the two ends of the second sub-muffler cavity located at the innermost radial direction of the first muffler cavity along the circumferential direction of the first muffler cavity are located outside the high-speed airflow zone, wherein the high-speed airflow zone includes a first area and a second area, a fan is provided in the fan cavity, the volute body has a volute tongue, a straight line tangent to the volute tongue profile line is drawn from the center of the fan, a fan-shaped area formed by rotating 60° along the rotation direction of the fan with the center of the fan as the axis is the first area, and a circular area between two circles with the center of the fan as the center and 90% and 110% of the diameter of the fan is the second area.

[0019] In some embodiments of the present invention, the opening is provided at an end of the first sub-muffler cavity away from the high-speed airflow area.

[0020] In some embodiments of the present invention, the number of openings in the high-speed airflow zone does not exceed 15% of the total number of openings.

[0021] In some embodiments of the present invention, Z of the first silencing cavity satisfies:

[0022]

[0023] Where n represents the ordinal number of the first sub-muffler cavity, Z OC represents the acoustic impedance of the first sub-muffler cavity and the opening portion of the volute body and satisfies:

[0024]

[0025] Where φ is the area correction factor, is the acoustic impedance of the second sub-muffler cavity connected to the opening, Z ORF represents the acoustic impedance of the opening portion of the volute body; Z ORF satisfy:

[0026]

[0027] satisfy:

[0028]

[0029] Among the plurality of second sub-silencing cavities in the same first sub-silencing cavity, the second sub-silencing cavity connected to the opening is a first section cavity, and along the radial direction of the first sub-silencing cavity, the second sub-silencing cavities are arranged in sequence. i is the equivalent length of the second sub-muffler cavity of the i-th section, μ is the dynamic viscosity of air, is the local area correction coefficient, ΔNL is the nonlinear effect correction coefficient, ΔAM is the sound quality correction coefficient, is the local equivalent wavelength, is the local air equivalent characteristic impedance:

[0030]

[0031]

[0032] Among them, l ci It is equivalent to the midline length of the second sub-silence chamber of the i-th section, Equivalent to the air density of the second sub-silence chamber in the i-th section, is equivalent to the speed of sound in the air of the second sub-silence chamber of the i-th section, ρ0 is the air density, μ′ is the air thermal viscosity, ω is the working angular frequency, γ is the specific heat rate, and P0 is the atmospheric pressure.

[0033] In some embodiments of the present invention, the silencer chamber further includes a second silencer chamber, the second silencer chamber is located radially outside the first silencer chamber, and the inner wall surface of the end of the fan chamber away from the air inlet has the opening connected to the second silencer chamber.

[0034] In some embodiments of the present invention, the second muffler cavity comprises a plurality of spaced-apart third sub-muffler cavities, and each of the third sub-muffler cavities has an opening communicating with the fan cavity on a wall surface facing the fan cavity.

[0035] In some embodiments of the present invention, the height of the muffler chamber in the axial direction of the volute body is 2-20 mm.

[0036] In some embodiments of the present invention, the opening extends along a radial direction of the mounting hole.

[0037] In some embodiments of the present invention, the length of the opening along the radial direction of the mounting hole is greater than 1 / 4 of the width of the second sub-muffler chamber along the radial direction of the mounting hole and is not greater than the width of the second sub-muffler chamber along the radial direction of the mounting hole.

[0038] In some embodiments of the present invention, the opening is a square hole or a fan-shaped hole.

[0039] In some embodiments of the present invention, the width of the opening along the circumferential direction of the mounting hole is 1-5 mm.

[0040] In some embodiments of the present invention, the axis of the opening is parallel to or at an angle to the axis of the volute body.

[0041] In some embodiments of the present invention, the axis of the opening is a straight line or a spiral line.

[0042] In some embodiments of the present invention, the volute body includes a body part and a sealing cover plate. The fan chamber is arranged in the body part, the air inlet and the mounting hole are respectively arranged at two axial ends of the body part, the opening is arranged on a side of the body part away from the air inlet and penetrates the body part; the sealing cover plate is arranged on a side of the body part away from the air inlet and connected to the body part, and the silencing chamber is defined between the sealing cover plate and the body part.

[0043] The fan assembly according to the embodiment of the present invention comprises a fan, a motor and the above-mentioned volute. The fan is arranged in the fan cavity; the motor is arranged in the mounting hole and connected to the fan.

[0044] According to the fan assembly of the embodiment of the present invention, a fan cavity is set in the volute body, and the fan is installed in the fan cavity. The motor is used to drive the fan to rotate. Under the action of the fan, the air flow enters the fan cavity from the air inlet. A silencer cavity is provided in the side wall of the volute body at the end facing away from the air inlet, the silencer cavity includes a first silencer cavity arranged around the mounting hole, the first silencer cavity includes a plurality of first sub-silencer cavity spaced apart, the first sub-silencer cavity includes a plurality of second sub-silencer cavity arranged in the radial direction of the first silencer cavity and interconnected, each first sub-silencer cavity has an opening connected to the fan cavity on the wall surface facing the fan cavity, the airflow sound waves in the fan cavity can enter the plurality of first sub-silencer cavity through the opening, and flow along the second sub-silencer cavity directly entered, and are reflected at the circumferential edge of the second sub-silencer cavity to the second sub-silencer cavity adjacent and connected in the radial direction, the airflow sound waves are reflected in the plurality of second sub-silencer cavity, the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencer effect and enhance the user experience.

[0045] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0047] Figure 1 is an exploded view of a fan assembly according to an embodiment of the present invention;

[0048] Figure 2 is an exploded view from another angle of a fan assembly according to an embodiment of the present invention;

[0049] Figure 3 is an exploded view of a fan assembly according to an embodiment of the present invention from a side view;

[0050] Figure 4 is a three-dimensional diagram of a portion of a volute body and a fan of a fan assembly according to an embodiment of the present invention;

[0051] Figure 5 is a front view of a fan assembly according to an embodiment of the present invention with a sealing cover plate removed;

[0052] Figure 6 is a three-dimensional view of a fan assembly without a sealing cover plate according to an embodiment of the present invention;

[0053] Figure 7 is a front view of a fan assembly according to an embodiment of the present invention;

[0054] Figure 8 is a perspective view of a fan assembly according to an embodiment of the present invention;

[0055] Fig. 9 is a side view of a fan assembly according to an embodiment of the present invention;

[0056] Fig.10 is a stereoscopic view of a portion of a volute body of a fan assembly according to an embodiment of the present invention.

[0057] Reference numerals:

[0058] 1000. Fan assembly;

[0059] 100. Snail case;

[0060] 1. Volute body;

[0061] 11. Main body; 111. Opening; 12. Sealing cover; 13. Fan cavity; 14. Mounting hole;

[0062] 2. Silencer chamber;

[0063] 21, first silencer cavity; 211, first sub-silencer cavity; 2111, first sealing rib; 21111, notch; 2112, second sealing rib; 2113, second sub-silencer cavity; 22, second silencer cavity; 221, third sub-silencer cavity;

[0064] 200. Fan. DETAILED DESCRIPTION

[0065] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] The volute 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0069] like Figure 1 and Fig. 9 As shown, a volute 100 according to an embodiment of the present invention includes a volute body 1 .

[0070] Specifically, Figure 4 and Fig.10 As shown, a fan cavity 13 is provided in the volute body 1. When the volute 100 is used for the fan assembly 1000, the fan 200 is installed in the fan cavity 13. One axial end of the volute body 1 has an air inlet connected to the fan cavity 13, and the other axial end has a mounting hole 14 for a motor. The motor is used to drive the fan 200 to rotate. Under the action of the fan 200, the airflow enters the fan cavity 13 from the air inlet.

[0071] The volute body 1 may be composed of two half shells split along the axial direction, so that the processing of the air inlet and the processing of the mounting hole 14 are separated, and the processing of the volute body 1 is more convenient.

[0072] Optionally, the fan 200 may be a centrifugal wind wheel.

[0073] like Figure 2 , Figure 4 and Figure 5As shown, a muffler cavity 2 is provided in the side wall of the volute body 1 at one end away from the air inlet. Figure 4-Figure 10 As shown, the inner wall surface of the end of the fan chamber 13 facing away from the air inlet has an opening 111 connected to the silencer chamber 2. The airflow sound waves in the fan chamber 13 can enter the silencer chamber 2 through the opening 111, and the airflow sound waves can be dissipated in the silencer chamber 2, thereby enhancing the user experience.

[0074] The silencer chamber 2 includes a first silencer chamber 21, which is an annular shape arranged around the mounting hole 14, so that the silencer chamber 2 can better absorb the noise generated by the airflow at various positions of the fan 200. The first silencer chamber 21 includes a plurality of first sub-silencer chambers 211 spaced apart, and the first sub-silencer chamber 211 includes a plurality of second sub-silencer chambers 2113, which are arranged in the radial direction of the first silencer chamber 21 and are interconnected, and each second sub-silencer chamber 2113 extends along the circumferential direction of the first silencer chamber 21, and each first sub-silencer chamber 211 has an opening 111 on the wall surface facing the fan chamber 13, which is connected to the fan chamber 13.

[0075] That is to say, the airflow sound waves in the fan cavity 13 can enter into the multiple first sub-silence chambers 211 through the opening 111, and flow along the second sub-silence chamber 2113 directly entered, and are reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 adjacent and connected in the radial direction. The airflow sound waves are reflected in the multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect. The airflow sound waves in the fan cavity 13 can be dissipated in the multiple first sub-silence chambers 211, thereby enhancing the user experience.

[0076] According to the volute 100 of the embodiment of the present invention, a fan chamber 13 is provided in the volute body 1, and a fan 200 is installed in the fan chamber 13. A motor is used to drive the fan 200 to rotate. Under the action of the fan 200, airflow enters the fan chamber 13 from the air inlet. A muffler chamber 2 is provided in the side wall of the volute body 1 at the end away from the air inlet. The muffler chamber 2 includes a first muffler chamber 21 arranged around the mounting hole 14. The first muffler chamber 21 includes a plurality of first sub-muffler chambers 211 spaced apart. The first sub-muffler chamber 211 includes a plurality of second sub-muffler chambers 2113 arranged in the radial direction of the first muffler chamber 21 and connected to each other. Each first sub-muffler chamber 211 has an opening 111 connected to the fan chamber 13 on the wall surface facing the fan chamber 13. The muffler chamber 213 in the fan chamber 13 is provided with a plurality of first sub-muffler chambers 2113 arranged in the radial direction of the first muffler chamber 21 and connected to each other. The airflow sound waves can enter into the multiple first sub-silence chambers 211 through the opening 111, and flow along the second sub-silence chamber 2113 that is directly entered, and are reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 that is adjacent and connected in the radial direction. The airflow sound waves are reflected in the multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect and enhance the user experience.

[0077] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, two adjacent second sub-muffler cavities 2113 among the multiple second sub-muffler cavities 2113 within the same first sub-muffler cavity 211 have at least one end that is flush or uneven along the circumferential direction of the first muffler cavity 21. It can be understood that two adjacent second sub-muffler cavities 2113 among the multiple second sub-muffler cavities 2113 within the same first sub-muffler cavity 211 have at least one end that is flush along the circumferential direction of the first muffler cavity 21, so that when the airflow sound waves flow in the second sub-muffler cavity 2113 to the flush end along the circumferential direction of the first muffler cavity 21, they can be reflected to the adjacent second sub-muffler cavity 2113 relatively smoothly, so that the airflow can flow relatively smoothly; or multiple second sub-muffler cavities 2113 within the same first sub-muffler cavity 211 At least one end of two adjacent second sub-silence chambers 2113 in the second sub-silence chamber 2113 is uneven along the circumferential direction of the first silence chamber 21, so that when the airflow sound waves flow in the second sub-silence chamber 2113 to the uneven end along the circumferential direction of the first silence chamber 21, the airflow sound waves can be reflected multiple times at the positions of the adjacent end portions of the two second sub-silence chambers 2113 along the circumferential direction of the first silence chamber 21, which can enhance the silencing effect of the airflow sound waves in the first sub-silence chamber 211.

[0078] In some embodiments of the present invention, Figure 5 and Figure 6As shown, the volute 100 further includes a first sealing rib 2111 and a second sealing rib 2112. The first sealing rib 2111 is disposed in the first muffler cavity 21. The first sealing rib 2111 is annular and disposed around the mounting hole 14. The first sealing rib 2111 is a plurality of first sealing ribs spaced apart along the radial direction of the first muffler cavity 21. The first sealing rib 2111 can divide the first muffler cavity 21 into a plurality of circular rings. The first sealing rib 2111 can define a flow channel for airflow sound waves along the radial direction of the first muffler cavity 21. The first muffler cavity 21 is defined between the two first sealing ribs 2111 located at the outermost and innermost sides of the first muffler cavity 21 in the radial direction, so that the first muffler cavity 21 can better absorb the noise generated by the airflow at various positions of the fan 200.

[0079] A plurality of second sealing ribs 2112 are provided between any two adjacent first sealing ribs 2111 and are spaced apart along the circumferential direction of the first silencer chamber 21. The plurality of first sealing ribs 2111 and the plurality of second sealing ribs 2112 jointly define a plurality of second sub-silencer chambers 2113. A notch 21111 for connecting the two second sub-silencer chambers 2113 is provided on the first sealing rib 2111 between two adjacent second sub-silencer chambers 2113 in the same first sub-silencer chamber 211.

[0080] That is to say, the airflow sound waves in the fan cavity 13 can enter into the multiple second sub-silence chambers 2113 through the opening 111 and flow along the second sub-silence chambers 2113 that are directly entered, and are reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 that is adjacent and connected in the radial direction. The airflow sound waves are reflected in the multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect. The airflow sound waves in the fan cavity 13 can be dissipated in the multiple second sub-silence chambers 2113, thereby enhancing the user experience.

[0081] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the notch 21111 is located at one end of the first sealing rib 2111 inside the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21. After the airflow sound waves in the fan chamber 13 enter the plurality of second sub-muffler chambers 2113 through the opening 111, the airflow sound waves flow to one end of the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21, and the airflow sound waves can enter the adjacent second sub-muffler chamber 2113 through the notch 21111, so that the airflow sound waves can flow more smoothly in the first sub-muffler chamber 211, thereby improving the muffler effect of the first sub-muffler chamber 211.

[0082] In some embodiments of the present invention, Figure 5 and Figure 6As shown, when the number of the second sub-muffler chambers 2113 in the same first sub-muffler chamber 211 is greater than or equal to 3, the two notches 21111 connecting the three adjacent second sub-muffler chambers 2113 are respectively located at the two ends of the portion of the two first sealing ribs 2111 located in the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21. When the airflow sound waves flow between the three adjacent second sub-muffler chambers 2113, the airflow sound waves can fully flow along the circumferential direction of the corresponding second sub-muffler chamber 2113, and can flow to the adjacent second sub-muffler chamber 2113 at the edge, and the flow path of the airflow sound waves is longer, which can achieve a good muffler effect.

[0083] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the opening 111 connecting each first sub-muffler cavity 211 with the fan cavity 13 is connected to the outermost second sub-muffler cavity 2113 or the innermost second sub-muffler cavity 2113 in the radial direction of the first muffler cavity 21 in the first sub-muffler cavity 211 . That is to say, the airflow sound waves in the fan chamber 13 can enter the second sub-silence chamber 2113 which is the outermost in the radial direction of the first silencer chamber 21 in the first sub-silence chamber 211 through the opening 111, or the airflow sound waves in the fan chamber 13 can enter the second sub-silence chamber 2113 which is the innermost in the radial direction of the first silencer chamber 21 in the first sub-silence chamber 211 through the opening 111; and flow along the second sub-silence chamber 2113 which is directly entered, and be reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 which is adjacent and connected in the radial direction, and the airflow sound waves are reflected in multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect, and the airflow sound waves in the fan chamber 13 can be eliminated in multiple second sub-silence chambers 2113, thereby enhancing the user experience.

[0084] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, along the circumferential direction of the first silencer cavity 21, the opening 111 is located at one end of the second sub-silencer cavity 2113 away from the notch 21111. After the airflow sound waves in the fan cavity 13 enter the first sub-silencer cavity 211 through the opening 111, the airflow flow direction in the first sub-silencer cavity 211 is relatively uniform, and the silencing effect of the first sub-silencer cavity 211 can be better achieved.

[0085] In some embodiments of the present invention, the width between two adjacent first sealing ribs 2111 is 4-14 mm. It is understood that the width between two adjacent first sealing ribs 2111 can be 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm or 14 mm. The width between two adjacent first sealing ribs 2111 is not less than 4 mm, which can make the radial size of the second sub-silence chamber 2113 larger, so that the space available for sound wave reflection in the second sub-silence chamber 2113 can be larger, and the second sub-silence chamber 2113 has a certain sound-absorbing effect; the width between two adjacent first sealing ribs 2111 is not greater than 14 mm, which can avoid the size of the second sub-silence chamber 2113 being too large, so that the first silencer chamber 21 can be divided into more first sub-silence chambers 211, and the first sub-silence chamber 211 can be divided into more second sub-silence chambers 2113, so that the airflow sound waves in the fan chamber 13 can be eliminated in multiple second sub-silence chambers 2113, which can achieve a better sound-absorbing effect and enhance the user experience.

[0086] In some embodiments of the present invention, the thickness of the first sealing rib 2111 is 0.6-2.5mm. It is understandable that the thickness of the first sealing rib 2111 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm or 2.5mm. The thickness of the first sealing rib 2111 is not less than 0.6mm, which can make the strength of the first sealing rib 2111 greater and the structure of the second sub-muffler chamber 2113 more reliable; the thickness of the first sealing rib 2111 is not more than 2.5mm, which can prevent the first sealing rib 2111 from affecting the size of the muffler space of the first muffler chamber 21, and can prevent the first sealing rib 2111 from affecting the muffler effect of the first muffler chamber 21.

[0087] In some embodiments of the present invention, the thickness of the second sealing rib 2112 is 0.6-2.5mm. It is understandable that the thickness of the second sealing rib 2112 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm or 2.5mm. The thickness of the second sealing rib 2112 is not less than 0.6mm, which can make the strength of the second sealing rib 2112 larger and the structure of the second sub-muffler chamber 2113 more reliable; the thickness of the second sealing rib 2112 is not more than 2.5mm, which can prevent the second sealing rib 2112 from affecting the size of the muffler space of the first muffler chamber 21, and can prevent the second sealing rib 2112 from affecting the muffler effect of the first muffler chamber 21.

[0088] In some embodiments of the present invention, the width between two adjacent first sealing ribs 2111 is Wc, and the thickness of the first sealing rib 2111 is h. c , the outer diameter of the first sealing rib 2111 located at the radially outermost side of the first muffler cavity 21 among the plurality of first sealing ribs 2111 is D, the inner diameter of the first sealing rib 2111 located at the radially innermost side of the first muffler cavity 21 among the plurality of first sealing ribs 2111 is d, and the following conditions are satisfied:

[0089] N c +(N+1)h c =0.5(Dd)

[0090] Wherein, N is a positive integer greater than or equal to 4.

[0091] It can be understood that N is the number of circular ring layers in the first silencer chamber 21, that is, the first sealing rib 2111 divides the first silencer chamber 21 into at least four circular ring layers. At this time, at least five circles of the first sealing rib 2111 are required. Along the radial direction of the first silencer chamber 21, the width of the first silencer chamber 21 is the same as the middle value of the inner and outer diameters of the first silencer chamber 21. The layout of the first sealing rib 2111 and the size of the first silencer chamber 21 can be set correspondingly, which can improve the silencing effect of the first silencer chamber 21.

[0092] Among them, the outer diameter of the first sealing rib 2111 located at the radially outermost side of the first silencer cavity 21 among the plurality of first sealing ribs 2111 may be the outer diameter of the first silencer cavity 21, and the inner diameter of the first sealing rib 2111 located at the radially innermost side of the first silencer cavity 21 among the plurality of first sealing ribs 2111 may be the inner diameter of the first silencer cavity 21. Compared with the outer diameter of the fan 200, the outer diameter of the first silencer cavity 21 may be 50 mm smaller than the outer diameter of the fan 200, or the outer diameter of the first silencer cavity 21 may be 100 mm larger than the outer diameter of the fan 200, so that the first silencer cavity 21 has a larger silencing range. Compared with the inner diameter of the first silencer cavity 21 and the diameter of the mounting hole 14 of the motor, the inner diameter of the first silencer cavity 21 may be roughly equivalent to the diameter of the mounting hole 14, so that the first silencer cavity 21 is provided with a silencer cavity 2 at a position close to the radial center of the fan 200, so that the first silencer cavity 21 has a larger silencing range.

[0093] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the number of the first sub-silence chambers 211 is greater than or equal to 10. At this time, the number of the first sub-silence chambers 211 is relatively large, so that the airflow sound waves in the fan chamber 13 can be dispersed into multiple first sub-silence chambers 211, so that the airflow sound waves can be dissipated in multiple first sub-silence chambers 211, which can achieve a better silencing effect and enhance the user experience.

[0094] In some embodiments of the present invention, a high-speed airflow zone is provided on the inner wall of the fan chamber 13 on the side facing away from the air inlet, and at least one of the two ends of the second sub-muffler chamber 2113 located at the outermost side in the radial direction of the first muffler chamber 21 in the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21 and the two ends of the second sub-muffler chamber 2113 located at the innermost side in the radial direction of the first muffler chamber 21 along the circumferential direction of the first muffler chamber 21 are located outside the high-speed airflow zone. It can be understood that the airflow velocity in the high-speed airflow area is faster and more noise is generated. The closed end of the second sub-muffler chamber 2113 located at the outermost radial direction of the first muffler chamber 21 in the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21 can be located outside the high-speed airflow area, which can avoid as much as possible the accumulation of more airflow sound waves at the closed end of the second sub-muffler chamber 2113 located at the outermost radial direction of the first muffler chamber 21, and can avoid the airflow generating more difficult-to-dispel noise here; the closed end of the second sub-muffler chamber 2113 located at the innermost radial direction of the first muffler chamber 21 in the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21 can be located outside the high-speed airflow area, which can avoid as much as possible the accumulation of more airflow sound waves at the closed end of the second sub-muffler chamber 2113 located at the innermost radial direction of the first muffler chamber 21, and can avoid the airflow generating more difficult-to-dispel noise here.

[0095] The high-speed airflow area includes a first area and a second area. A fan 200 is arranged in the fan cavity 13. The volute body 1 has a volute tongue. A straight line tangent to the volute tongue profile line is drawn from the center of the fan 200. The fan-shaped area formed by rotating 60° along the rotation direction of the fan 200 with the center of the fan 200 as the axis is the first area. The vortex airflow generated when the fan 200 is working is affected by the volute tongue and the direction is changed, and the speed of the airflow near the volute tongue increases. The annular area between two circles with the center of the fan 200 as the center and 90% and 110% of the diameter of the fan 200 is the second area; it can be understood that the airflow at the radial edge of the fan 200 can form a high-pressure airflow, so that the flow rate of the airflow sound wave is faster. There is an overlapping part between the first area and the second area, and the overlapping part and the non-overlapping part are both regarded as high-speed airflow areas.

[0096] In some embodiments of the present invention, the opening 111 is disposed at one end of the first sub-muffler cavity 211 away from the high-speed airflow area. This can prevent the high-speed airflow from directly entering the first sub-muffler cavity 211 from the opening 111 as much as possible, and prevent the high-speed airflow from directly entering the first sub-muffler cavity 211 to generate new noise, thereby ensuring the muffler effect of the first muffler cavity 21.

[0097] In some embodiments of the present invention, the number of openings 111 in the high-speed airflow zone does not exceed 15% of the total number of openings 111. This can reduce the probability of high-speed airflow directly entering the first sub-muffler cavity 211 from the openings 111, and reduce the probability of new noise generated when high-speed airflow directly enters the first sub-muffler cavity 211, thereby ensuring the muffler effect of the first muffler cavity 21.

[0098] In some embodiments of the present invention, Z of the first muffler cavity 21 satisfies:

[0099]

[0100] Wherein, Z is the acoustic impedance of the first silencing cavity 21, n represents the ordinal number of the first sub-silencing cavity 212, and Z OC It represents the acoustic impedance of the first sub-muffler cavity 212 and the opening portion of the volute body 1 and satisfies:

[0101]

[0102] Where φ is the area correction factor, is the acoustic impedance of the second sub-muffler cavity 2113 connected to the opening 111, Z ORF represents the acoustic impedance of the opening 111 on the volute body 1; Z ORF satisfy:

[0103]

[0104] satisfy:

[0105]

[0106] Among the plurality of second sub-muffler cavities 2113 in the same first sub-muffler cavity 211, the second sub-muffler cavity 2113 connected to the opening is a first section cavity. Along the radial direction of the first muffler cavity 21, the second sub-muffler cavities 2113 are arranged in sequence. i is the equivalent length of the second sub-silencing cavity 2113 of the i-th section, μ is the dynamic viscosity of air, is the local area correction coefficient, ΔNL is the nonlinear effect correction coefficient, ΔAM is the sound quality correction coefficient, is the local equivalent wavelength, is the local air equivalent characteristic impedance:

[0107]

[0108]

[0109] Among them, l ci is equivalent to the midline length of the second sub-silence chamber 2113 of the i-th section, is equivalent to the air density of the second sub-silence chamber 2113 of the i-th section, is equivalent to the speed of sound in the air of the second sub-silencing cavity 2113 of the i-th section, ρ0 is the air density, μ′ is the air thermal viscosity, ω is the working angular frequency, γ is the specific heat rate, and P0 is the atmospheric pressure.

[0110] It can be understood that the sound absorption coefficient α of the volute 100 can be calculated from the acoustic impedance Z of the first silencing cavity 21. When the sound absorption coefficient α of the volute 100 satisfies a certain value, a better silencing effect can be obtained, from which the width Wc between two adjacent first sealing ribs 2111 and the thickness h of the first sealing rib 2111 can be obtained. c and the midline length l of the second sub-muffler cavity 2113 ci The various parameters of the second sub-silence chamber 2113 can be designed according to the above value range, and can be designed in combination with the shape of the fan chamber 13. The shape of the first sub-silence chamber 211 composed of multiple second sub-silence chambers 2113 can be more reasonable, and the shape of the first sub-silence chamber 21 composed of multiple first sub-silence chambers 211 can be more reasonable.

[0111] At this time, each first sub-muffler cavity 211 connected to the opening 111 is essentially a composite muffler based on a perforated plate and a folded cavity, which can resonate at a specific frequency to reach a sound absorption peak. This series of cavities forms acoustic coupling in space and frequency domain, thereby achieving a broadband sound absorption effect with a bandwidth exceeding 500 Hz.

[0112] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the silencing chamber 2 also includes a second silencing chamber 22, which is located radially outside the first silencing chamber 21, and the inner wall surface of the end of the fan chamber 13 away from the air inlet is provided with an opening 111 connected to the second silencing chamber 22. The airflow sound waves radially outside the fan 200 in the fan chamber 13 can enter the second silencing chamber 22 through the opening 111, and the sound waves are reflected when reaching the closed boundary of the second silencing chamber 22. The reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect and enhance the user experience.

[0113] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the second muffler cavity 22 includes a plurality of spaced third sub-muffler cavities 221, and each third sub-muffler cavity 221 has an opening 111 on the wall facing the fan cavity 13, which is connected to the fan cavity 13. In other words, the airflow sound waves in the fan cavity 13 can enter the plurality of third sub-muffler cavities 221 through the opening 111, and the airflow sound waves in the fan cavity 13 can be dissipated in the plurality of third sub-muffler cavities 221. In addition, the second muffler cavity 22 is provided with a plurality of third sub-muffler cavities 221 with muffler effect, which can achieve a better muffler effect and enhance the user experience.

[0114] In some embodiments of the present invention, the height of the muffler chamber 2 in the axial direction of the volute body 1 is 2-20 mm. It is understandable that the height of the muffler chamber 2 in the axial direction of the volute body 1 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm. The height of the muffler chamber 2 in the axial direction of the volute body 1 can be selected according to the size of the fan 200. The height of the muffler chamber 2 in the axial direction of the volute body 1 is not less than 2 mm, which can make the space available for sound wave reflection in the muffler chamber 2 larger, so that the muffler chamber 2 has a certain muffler effect, and the noise of the fan 200 is eliminated when it is working; the height of the muffler chamber 2 in the axial direction of the volute body 1 is not more than 20 mm, which can make the size of the muffler chamber 2 smaller and the volute 100 smaller.

[0115] In some embodiments of the present invention, Figure 4 and Fig.10 As shown, the opening 111 extends in the radial direction of the mounting hole 14. That is, the length direction of the opening 111 is close to the radial direction of the mounting hole 14, so that the size of the opening 111 can be smaller than that of the muffler cavity 2, and the muffler cavity 2 can have a better muffler effect.

[0116] In some embodiments of the present invention, the length of the opening 111 along the radial direction of the mounting hole 14 is greater than half 1 / 4 of the width of the silencer chamber 2 along the radial direction of the mounting hole 14 where the opening 111 is located, and is not greater than the width of the second sub-silencer chamber 2113 along the radial direction of the mounting hole 14. This allows the airflow sound waves in the fan chamber 13 to enter the silencer chamber 2 from the opening 111 more smoothly, thereby ensuring the silencer effect of the silencer chamber 2. At the same time, the length of the opening 111 along the radial direction of the mounting hole 14 is not greater than the width of the second sub-silencer chamber 2113 along the radial direction of the mounting hole 14, thereby allowing each opening 111 to be connected only to the corresponding second sub-silencer chamber 2113, thereby protecting the silencer effect of the second sub-silencer chamber 2113.

[0117] In some embodiments of the present invention, Figure 4 and Fig.10 As shown, the opening 111 is a square hole or a fan-shaped hole. It is understandable that the four sides of the square hole are straight sides, and the two sides of the fan-shaped hole spaced apart in the radial direction of the mounting hole 14 are arc sides, and the shape of the opening 111 can be selected according to the silencing requirements of the silencing chamber 2 and the processing method.

[0118] In some embodiments of the present invention, the width of the opening 111 along the circumferential direction of the mounting hole 14 is 1-5 mm. It is understandable that the width of the opening 111 along the circumferential direction of the mounting hole 14 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm. The width of the opening 111 along the circumferential direction of the mounting hole 14 is not less than 1 mm, so that the opening 111 has a certain size, so that the airflow sound waves in the fan chamber 13 can pass through the opening 111 more conveniently, ensuring the silencing effect of the silencer chamber 2; the width of the opening 111 along the circumferential direction of the mounting hole 14 is not more than 5 mm, so that the silencing chamber 2 can make the boundary of the silencing chamber 2 for sound wave reflection larger, ensuring the silencing effect of the silencing chamber 2.

[0119] In some embodiments of the present invention, the axis of the opening 111 is parallel to or at an angle to the axis of the volute body 1. It is understood that the line connecting the center points on any cross section of the opening 111 perpendicular to the axis of the volute body 1 is the axis of the opening 111. When the two surfaces of the opening 111 extending in the radial direction of the mounting hole 14 are perpendicular to the wall surface of the fan chamber 13, the axis of the opening 111 is parallel to the axis of the volute body 1; when the two surfaces of the opening 111 extending in the radial direction of the mounting hole 14 are not perpendicular to the wall surface of the fan chamber 13, the axis of the opening 111 is at an angle to the axis of the volute body 1. The axial direction of the opening 111 can be selected according to the size of the fan 200 and the data of the sound waves generated during operation.

[0120] In some embodiments of the present invention, the axis of the opening 111 is a straight line or a spiral line. In other words, the axis of the opening 111 can be processed in a straight line or a spiral line, and can be selected according to the processing process and the tool required for processing the opening 111, so that the processing of the opening 111 is more convenient.

[0121] In some embodiments of the present invention, Figure 3 , Figure 7 and Figure 8 As shown, the volute body 1 includes a body 11 and a sealing cover plate 12. The fan chamber 13 is arranged in the body 11, the air inlet and the mounting hole 14 are respectively arranged at the axial ends of the body 11, and the opening 111 is arranged on the side of the body 11 away from the air inlet and penetrates the body 11. After the fan 200 drives the airflow into the fan chamber 13 from the air inlet, the silencer chamber 2 is arranged on the side of the body 11 away from the air inlet and is connected to the opening 111, and the airflow sound waves can enter the silencer chamber 2 from the opening 111 along the axial direction of the body 11 more smoothly, thereby ensuring the silencer effect of the volute 100. The sealing cover plate 12 is arranged on the side of the body 11 away from the air inlet and is connected to the body 11, and the silencer chamber 2 is defined between the sealing cover plate 12 and the body 11. The silencer chamber 2 can be obtained by separately processing and connecting the sealing cover plate 12 and the main body 11 , so that the processing of the silencer chamber 2 is more convenient.

[0122] A volute 100 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings. It should be understood that the following description is merely exemplary and is intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0123] like Figure 1 As shown, a volute 100 according to an embodiment of the present invention includes a volute body 1 .

[0124] Specifically, a fan cavity 13 is provided in the volute body 1. When the volute 100 is used in the fan assembly 1000, the fan 200 can be a centrifugal wind wheel. The fan 200 is installed in the fan cavity 13. One axial end of the volute body 1 has an air inlet connected to the fan cavity 13, and the other axial end has a mounting hole 14 for a motor. The motor is used to drive the fan 200 to rotate. Under the action of the fan 200, the airflow enters the fan cavity 13 from the air inlet.

[0125] A silencer chamber 2 is provided in the side wall of the volute body 1 at the end facing away from the air inlet, and an opening 111 connected to the silencer chamber 2 is provided on the inner wall surface of the end facing away from the air inlet of the fan chamber 13. The airflow sound waves in the fan chamber 13 can enter the silencer chamber 2 through the opening 111. The silencer chamber 2 includes a first silencer chamber 21, which is a circular ring shape arranged around the mounting hole 14, so that the silencer chamber 2 can better absorb the noise generated by the airflow at various positions of the fan 200. The first silencer chamber 21 includes a plurality of first sub-silencer chambers 211 spaced apart from each other, the first sub-silencer chamber 211 includes a plurality of second sub-silencer chambers 2113, the plurality of second sub-silencer chambers 2113 are arranged in the radial direction of the first silencer chamber 21 and are interconnected, each second sub-silencer chamber 2113 extends along the circumferential direction of the first silencer chamber 21, and each first sub-silencer chamber 211 has an opening 111 on the wall surface facing the fan chamber 13, which is connected to the fan chamber 13.

[0126] The airflow sound waves in the fan cavity 13 can enter into the multiple first sub-silence chambers 211 through the opening 111, and flow along the second sub-silence chamber 2113 directly entered, and are reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 adjacent and connected in the radial direction. The airflow sound waves are reflected in the multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect. The airflow sound waves in the fan cavity 13 can be eliminated in the multiple first sub-silence chambers 2111, thereby enhancing the user experience.

[0127] Two adjacent second sub-muffler cavities 2113 in the plurality of second sub-muffler cavities 2113 in the same first sub-muffler cavity 211 have at least one end that is flush or uneven along the circumferential direction of the first muffler cavity 21. Two adjacent second sub-muffler cavities 2113 in the plurality of second sub-muffler cavities 2113 in the same first sub-muffler cavity 211 have at least one end that is flush along the circumferential direction of the first muffler cavity 21, so that when the airflow sound waves flow in the second sub-muffler cavity 2113 to the flush end along the circumferential direction of the first muffler cavity 21, they can be relatively smoothly reflected to the adjacent second sub-muffler cavity 2113, so that the airflow can flow relatively smoothly; or multiple second sub-muffler cavities in the same first sub-muffler cavity 211 At least one end of two adjacent second sub-silence chambers 2113 in the sound chamber 2113 along the circumferential direction of the first silencer chamber 21 is uneven, so that when the airflow sound waves flow in the second sub-silence chamber 2113 to the uneven end along the circumferential direction of the first silencer chamber 21, the airflow sound waves can be reflected multiple times at the positions of the adjacent end portions of the two second sub-silence chambers 2113 along the circumferential direction of the first silencer chamber 21, which can enhance the silencing effect of the airflow sound waves in the first sub-silence chamber 211.

[0128] The volute 100 further includes a first sealing rib 2111 and a second sealing rib 2112. The first sealing rib 2111 is disposed in the first muffler cavity 21. The first sealing rib 2111 is annular and disposed around the mounting hole 14. The first sealing rib 2111 is a plurality of first sealing ribs spaced apart along the radial direction of the first muffler cavity 21. The first sealing rib 2111 can divide the first muffler cavity 21 into a plurality of circular rings. The first sealing rib 2111 can define a flow channel for airflow sound waves along the radial direction of the first muffler cavity 21. The first muffler cavity 21 is defined between the two first sealing ribs 2111 located at the outermost and innermost sides of the first muffler cavity 21 in the radial direction, so that the first muffler cavity 21 can better absorb the noise generated by the airflow at various positions of the fan 200.

[0129] A plurality of second sealing ribs 2112 are provided between any two adjacent first sealing ribs 2111 and are spaced apart along the circumferential direction of the first silencer chamber 21. The plurality of first sealing ribs 2111 and the plurality of second sealing ribs 2112 jointly define a plurality of second sub-silencer chambers 2113. A notch 21111 for connecting the two second sub-silencer chambers 2113 is provided on the first sealing rib 2111 between two adjacent second sub-silencer chambers 2113 in the same first sub-silencer chamber 211.

[0130] That is to say, the airflow sound waves in the fan cavity 13 can enter into the multiple second sub-silence chambers 2113 through the opening 111 and flow along the second sub-silence chambers 2113 that are directly entered, and are reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 that is adjacent and connected in the radial direction. The airflow sound waves are reflected in the multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect. The airflow sound waves in the fan cavity 13 can be dissipated in the multiple second sub-silence chambers 2113, thereby enhancing the user experience.

[0131] The notch 21111 is located at one end of the first sealing rib 2111 located inside the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21. After the airflow sound waves in the fan chamber 13 enter the multiple second sub-muffler chambers 2113 through the opening 111, the airflow sound waves flow to one end of the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21, and the airflow sound waves can enter the adjacent second sub-muffler chamber 2113 through the notch 21111, so that the airflow sound waves can flow more smoothly in the first sub-muffler chamber 211, thereby improving the muffler effect of the first sub-muffler chamber 211. When the number of second sub-muffler chambers 2113 in the same first sub-muffler chamber 211 is greater than or equal to 3, the two notches 21111 connecting the three adjacent second sub-muffler chambers 2113 are respectively located at the two ends of the parts of the two first sealing ribs 2111 located inside the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21. When the airflow sound waves flow between three adjacent second sub-silencer chambers 2113, the airflow sound waves can fully flow along the circumferential direction of the corresponding second sub-silencer chamber 2113, and can flow toward the adjacent second sub-silencer chamber 2113 at the edge. The flow path of the airflow sound waves is longer, which can achieve a good sound-absorbing effect.

[0132] The opening 111 through which each first sub-muffler cavity 211 communicates with the fan cavity 13 is connected to the outermost second sub-muffler cavity 2113 or the innermost second sub-muffler cavity 2113 in the radial direction of the first muffler cavity 21 in the first sub-muffler cavity 211 . The airflow sound waves in the fan chamber 13 can enter the second sub-silence chamber 2113 which is the outermost in the radial direction of the first silencer chamber 21 in the first sub-silence chamber 21 through the opening 111, or the airflow sound waves in the fan chamber 13 can enter the second sub-silence chamber 2113 which is the innermost in the radial direction of the first silencer chamber 21 in the first sub-silence chamber 21 through the opening 111; and flow along the second sub-silence chamber 2113 which is directly entered, and be reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 which is adjacent and connected in the radial direction, and the airflow sound waves are reflected in multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect, and the airflow sound waves in the fan chamber 13 can be eliminated in multiple second sub-silence chambers 2113, thereby enhancing the user experience.

[0133] Along the circumferential direction of the first muffler cavity 21, the opening 111 is located at one end of the second sub-muffler cavity 2113 away from the notch 21111. After the airflow sound waves in the fan cavity 13 enter the first sub-muffler cavity 211 through the opening 111, the airflow flow direction in the first sub-muffler cavity 211 is relatively uniform, and the muffler effect of the first sub-muffler cavity 211 can be better achieved.

[0134] The first sealing rib 2111 divides the first silencer chamber 21 into at least four layers of circular rings. At this time, at least five circles of the first sealing rib 2111 are required. Along the radial direction of the first silencer chamber 21, the width of the first silencer chamber 21 is the same as the middle value of the inner and outer diameters of the first silencer chamber 21. The layout of the first sealing rib 2111 and the size of the first silencer chamber 21 can be set correspondingly, which can improve the silencer effect of the first silencer chamber 21.

[0135] The outer diameter of the first sealing rib 2111 located at the radially outermost side of the first muffler cavity 21 among the plurality of first sealing ribs 2111 may be the outer diameter of the first muffler cavity 21, and the inner diameter of the first sealing rib 2111 located at the radially innermost side of the first muffler cavity 21 among the plurality of first sealing ribs 2111 may be the inner diameter of the first muffler cavity 21. Compared with the outer diameter of the fan 200, the outer diameter of the first muffler cavity 21 may be 50 mm smaller than the outer diameter of the fan 200, or the outer diameter of the first muffler cavity 21 may be 100 mm larger than the outer diameter of the fan 200, so that the muffler range of the first muffler cavity 21 is larger. Compared with the inner diameter of the first muffler cavity 21 and the diameter of the mounting hole 14 of the motor, the inner diameter of the first muffler cavity 21 may be roughly equivalent to the diameter of the mounting hole 14, so that the first muffler cavity 21 is provided with a muffler cavity 2 at a position close to the radial center of the fan 200, so that the muffler range of the first muffler cavity 21 is larger.

[0136] The number of the first sub-silence chambers 211 is greater than or equal to 10. At this time, the number of the first sub-silence chambers 211 is large, which can disperse the airflow sound waves in the fan chamber 13 into multiple first sub-silence chambers 211, so that the airflow sound waves can be dissipated in multiple first sub-silence chambers 211, which can achieve a better silencing effect and enhance the user experience.

[0137] The inner wall of the fan chamber 13 on the side away from the air inlet has a high-speed airflow area, which includes a first area and a second area. A fan 200 is arranged in the fan chamber 13, and the volute body 1 has a volute tongue. A straight line tangent to the volute tongue profile line is drawn from the center of the fan 200. The fan-shaped area formed by rotating 60° along the rotation direction of the fan 200 with the center of the fan 200 as the axis is the first area. The vortex-shaped airflow generated when the fan 200 is working is affected by the volute tongue and the direction is changed, and the speed of the airflow near the volute tongue increases. The annular area between two circles with the center of the fan 200 as the center and 90% and 110% of the diameter of the fan 200 is the second area; it can be understood that the airflow at the radial edge of the fan 200 can form a high-pressure airflow, so that the flow rate of the airflow sound wave is faster. At least one of the two ends of the second sub-muffler chamber 2113 located at the outermost radial direction of the first muffler chamber 21 in the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21 and the two ends of the second sub-muffler chamber 2113 located at the innermost radial direction of the first muffler chamber 21 along the circumferential direction of the first muffler chamber 21 are located outside the high-speed airflow area. It can be understood that the airflow velocity in the high-speed airflow area is faster and more noise is generated. The closed end of the second sub-muffler chamber 2113 located at the outermost radial direction of the first muffler chamber 21 in the first sub-muffler chamber 211 along the circumferential direction of the first muffler chamber 21 can be located outside the high-speed airflow area, which can avoid as much as possible the accumulation of more airflow sound waves at the closed end of the second sub-muffler chamber 2113 located at the outermost radial direction of the first muffler chamber 21, and avoid the airflow generating more difficult-to-dissipate noise here.

[0138] The closed end of the second sub-silence chamber 2113 located at the innermost side of the first silencer chamber 21 in the radial direction of the first silencer chamber 21 can be located outside the high-speed airflow area, so as to avoid as much as possible the accumulation of more airflow sound waves at the closed end of the second sub-silence chamber 2113 located at the innermost side of the first silencer chamber 21 in the radial direction, and to avoid the airflow from generating more noise that is difficult to eliminate here.

[0139] The opening 111 is arranged at one end of the first sub-muffler cavity 211 away from the high-speed airflow area, and the number of the openings 111 in the high-speed airflow area does not exceed 15% of the total number of the openings 111. The probability of the high-speed airflow directly entering the first sub-muffler cavity 211 from the opening 111 can be reduced, and the probability of generating new noise when the high-speed airflow directly enters the first sub-muffler cavity 211 can be reduced, thereby ensuring the muffler effect of the first muffler cavity 21.

[0140] The silencer chamber 2 also includes a second silencer chamber 22, which is located radially outside the first silencer chamber 21. The second silencer chamber 22 includes a plurality of spaced third sub-silencer chambers 221, and each third sub-silencer chamber 221 has an opening 111 on the wall facing the fan chamber 13 that is connected to the fan chamber 13. In other words, the airflow sound waves in the fan chamber 13 can enter the plurality of third sub-silencer chambers 221 through the opening 111, and the airflow sound waves in the fan chamber 13 can be dissipated in the plurality of third sub-silencer chambers 221. The second silencer chamber 22 is provided with a plurality of third sub-silencer chambers 221 with a silencing effect, which can achieve a better silencing effect and enhance the user experience.

[0141] The opening 111 extends in the radial direction of the mounting hole 14, and the length of the opening 111 in the radial direction of the mounting hole 14 is greater than half 1 / 4 of the width of the silencer chamber 2 in the radial direction of the mounting hole 14 where the opening 111 is located, and is not greater than the width of the second sub-silencer chamber 2113 in the radial direction of the mounting hole 14. This allows the airflow sound waves in the fan chamber 13 to enter the silencer chamber 2 from the opening 111 more smoothly, thereby ensuring the silencer effect of the silencer chamber 2. At the same time, the length of the opening 111 in the radial direction of the mounting hole 14 is not greater than the width of the second sub-silencer chamber 2113 in the radial direction of the mounting hole 14, so that each opening 111 can be connected only to the corresponding second sub-silencer chamber 2113, thereby protecting the silencer effect of the second sub-silencer chamber 2113.

[0142] The opening 111 is a square hole or a fan-shaped hole. The four sides of the square hole are straight sides, and the two sides of the fan-shaped hole spaced apart in the radial direction of the mounting hole 14 are arc sides. The shape of the opening 111 can be selected according to the silencing requirements of the silencing chamber 2 and the processing method.

[0143] The axis of the opening 111 is parallel to or at an angle to the axis of the volute body 1. The line connecting the center points on any cross section of the opening 111 perpendicular to the axis of the volute body 1 is the axis of the opening 111. When the two surfaces of the opening 111 extending in the radial direction of the mounting hole 14 are perpendicular to the wall surface of the fan chamber 13, the axis of the opening 111 is parallel to the axis of the volute body 1; when the two surfaces of the opening 111 extending in the radial direction of the mounting hole 14 are not perpendicular to the wall surface of the fan chamber 13, the axis of the opening 111 is at an angle to the axis of the volute body 1. The axial direction of the opening 111 can be selected according to the size of the fan 200 and the data of the sound waves generated during operation. The axis of the opening 111 is a straight line or a spiral line. In other words, the axis of the opening 111 can be processed in a straight line or a spiral line, and can be selected according to the processing process and the tool required for processing the opening 111, so that the processing of the opening 111 is more convenient.

[0144] The volute body 1 includes a main body 11 and a sealing cover plate 12. A fan chamber 13 is provided in the main body 11, an air inlet and a mounting hole 14 are respectively provided at two axial ends of the main body 11, and an opening 111 is provided on the side of the main body 11 away from the air inlet and penetrates the main body 11. After the fan 200 drives the airflow into the fan chamber 13 from the air inlet, the silencer chamber 2 is provided on the side of the main body 11 away from the air inlet and communicates with the opening 111, and the airflow sound waves can enter the silencer chamber 2 from the opening 111 along the axial direction of the main body 11 relatively smoothly, thereby ensuring the silencer effect of the volute 100. The sealing cover plate 12 is provided on the side of the main body 11 away from the air inlet and is connected to the main body 11, and the silencer chamber 2 is defined between the sealing cover plate 12 and the main body 11. The silencer chamber 2 can be obtained by separately processing and connecting the sealing cover plate 12 and the main body 11 , so that the processing of the silencer chamber 2 is more convenient.

[0145] The fan assembly 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0146] Specifically, the fan assembly 1000 according to the embodiment of the present invention includes a fan 200, a motor and the above-mentioned volute 100. The fan 200 is arranged in the fan cavity 13, and the motor is arranged in the mounting hole 14 and connected to the fan 200, and the motor can drive the fan 200 to rotate.

[0147] According to the fan assembly 1000 of the embodiment of the present invention, a fan cavity 13 is provided in the volute body 1, and a fan 200 is installed in the fan cavity 13. A motor is used to drive the fan 200 to rotate. Under the action of the fan 200, the airflow enters the fan cavity 13 from the air inlet. A muffler cavity 2 is provided in the side wall of the volute body 1 at the end away from the air inlet. The muffler cavity 2 includes a first muffler cavity 21 provided around the mounting hole 14. The first muffler cavity 21 includes a plurality of first sub-muffler cavities 211 spaced apart. The first sub-muffler cavity 211 includes a plurality of second sub-muffler cavities 2113 arranged in the radial direction of the first muffler cavity 21 and connected to each other. Each first sub-muffler cavity 211 has an opening 111 connected to the fan cavity 13 on the wall surface facing the fan cavity 13. The muffler cavity 213 in the fan cavity 13 has a plurality of second sub-muffler cavities 2113 arranged in the radial direction of the first muffler cavity 21 and connected to each other. The airflow sound waves can enter into the multiple first sub-silence chambers 211 through the opening 111, and flow along the second sub-silence chamber 2113 that is directly entered, and are reflected at the circumferential edge of the second sub-silence chamber 2113 to the second sub-silence chamber 2113 that is adjacent and connected in the radial direction. The airflow sound waves are reflected in the multiple second sub-silence chambers 2113, and the reflected sound waves can be superimposed and offset with the incident sound waves with opposite phases at the same frequency, which can achieve a good silencing effect and enhance the user experience.

[0148] Other structures and operations of the volute 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0149] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0150] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A volute, characterized in that: include: A volute body, wherein the volute body has a fan cavity, an axial end of the volute body has an air inlet connected to the fan cavity, and the other axial end has a motor mounting hole, a side wall of the volute body at one end away from the air inlet has a silencer cavity, and an inner wall surface of the fan cavity at one end away from the air inlet has an opening connected to the silencer cavity, The silencer cavity includes a first silencer cavity, which is a circular ring shape arranged around the mounting hole, and includes a plurality of first sub-silencer cavities spaced apart from each other, and the first sub-silencer cavity includes a plurality of second sub-silencer cavities, and the plurality of second sub-silencer cavities are arranged in the radial direction of the first silencer cavity and are interconnected, and each of the second sub-silencer cavities extends along the circumferential direction of the first silencer cavity, and each of the first sub-silencer cavities has the opening connected to the fan cavity on the wall surface facing the fan cavity.

2. The volute according to claim 1, characterized in that: Two adjacent second sub-silencer cavities in the same first sub-silencer cavity have at least one end aligned or uneven along the circumferential direction of the first sub-silencer cavity.

3. The volute according to claim 1, characterized in that: Also includes: A first sealing rib, the first sealing rib is arranged in the first muffler cavity, the first sealing rib is annular and arranged around the mounting hole, and the first muffler cavity is defined between two first sealing ribs located at the outermost and innermost sides of the first muffler cavity in the radial direction; A second sealing rib, a plurality of second sealing ribs spaced apart along the circumferential direction of the first silencer cavity are provided between any two adjacent first sealing ribs, the plurality of first sealing ribs and the plurality of second sealing ribs jointly define a plurality of second sub-silencer cavities, and a notch connecting the two second sub-silencer cavities is provided on the first sealing rib between two adjacent second sub-silencer cavities in the same first sub-silencer cavity.

4. The volute according to claim 3, characterized in that: The notch is located at one end of the first sealing rib located inside the first sub-muffler chamber along the circumferential direction of the first muffler chamber.

5. The volute according to claim 4, characterized in that: When the number of the second sub-silence chambers in the same first sub-silence chamber is greater than or equal to 3, the two notches connecting the three adjacent second sub-silence chambers are respectively located at the two ends of the parts of the two first sealing ribs located in the first sub-silence chamber along the circumferential direction of the first silencer chamber.

6. The volute according to claim 4, characterized in that: The openings connecting each of the first sub-muffler chambers with the fan chamber are connected to the outermost second sub-muffler chamber or the innermost second sub-muffler chamber in the first sub-muffler chamber along the radial direction of the first muffler chamber.

7. The volute according to claim 6, characterized in that: Along the circumferential direction of the first silencing cavity, the opening is located at an end of the second sub-silencing cavity away from the notch.

8. The volute according to claim 3, characterized in that: The width between two adjacent first sealing ribs is 4-14 mm; And / or, the thickness of the first sealing rib is 0.6-2.5 mm; And / or, the thickness of the second sealing rib is 0.6-2.5 mm.

9. The volute according to claim 3, characterized in that: The width between two adjacent first sealing ribs is Wc, and the thickness of the first sealing rib is h c , the outer diameter of the first sealing rib located at the radially outermost side of the first muffler cavity among the plurality of first sealing ribs is D, the inner diameter of the first sealing rib located at the radially innermost side of the first muffler cavity among the plurality of first sealing ribs is d, and the following conditions are satisfied: Nw c +(N+1)h c =0.5(Dd) Wherein, N is a positive integer greater than or equal to 4.

10. The volute according to claim 1, characterized in that: The number of the first sub-silencing cavities is greater than or equal to 10.

11. The volute according to claim 1, characterized in that: The inner wall of the fan cavity on the side away from the air inlet has a high-speed airflow area, and at least one of the two ends of the second sub-muffler cavity located at the outermost side of the first muffler cavity in the radial direction of the first muffler cavity and the two ends of the second sub-muffler cavity located at the innermost side of the first muffler cavity in the radial direction of the first muffler cavity along the circumferential direction of the first muffler cavity are located outside the high-speed airflow area. Wherein, the high-speed airflow zone includes a first area and a second area, a fan is arranged in the fan chamber, the volute body has a volute tongue, a straight line tangent to the volute tongue profile line is drawn from the center of the fan, and a fan-shaped area formed by rotating 60° along the rotation direction of the fan with the center of the fan as the axis is the first area, and an annular area between two circles with the center of the fan as the center and 90% and 110% of the diameter of the fan is the second area.

12. The volute according to claim 11, characterized in that: The opening is arranged at an end of the first sub-muffler cavity away from the high-speed airflow area.

13. The volute according to claim 11, characterized in that: The number of openings in the high-speed airflow zone does not exceed 15% of the total number of openings.

14. The volute according to claim 1, characterized in that: The Z of the first silencing cavity satisfies: Where n represents the ordinal number of the first sub-muffler cavity, Z OC represents the acoustic impedance of the first sub-muffler cavity and the opening portion of the volute body and satisfies: Where φ is the area correction factor, is the acoustic impedance of the second sub-muffler cavity connected to the opening, Z ORF represents the acoustic impedance of the opening portion of the volute body; Z oRF satisfy: satisfy: Among the plurality of second sub-silencing cavities in the same first sub-silencing cavity, the second sub-silencing cavity connected to the opening is a first section cavity, and along the radial direction of the first sub-silencing cavity, the second sub-silencing cavities are arranged in sequence. i is the equivalent length of the second sub-muffler cavity of the i-th section, μ is the dynamic viscosity of air, is the local area correction coefficient, ΔNL is the nonlinear effect correction coefficient, ΔAM is the sound quality correction coefficient, is the local equivalent wavelength, is the local air equivalent characteristic impedance: Among them, l ci It is equivalent to the midline length of the second sub-silence chamber of the i-th section, Equivalent to the air density of the second sub-silence chamber in the i-th section, is equivalent to the speed of sound in the air of the second sub-silence chamber of the i-th section, ρ0 is the air density, μ′ is the air thermal viscosity, ω is the working angular frequency, γ is the specific heat rate, and P0 is the atmospheric pressure.

15. The volute according to claim 1, characterized in that The silencing chamber further comprises a second silencing chamber, which is located radially outside the first silencing chamber, and the inner wall surface of one end of the fan chamber away from the air inlet has the opening connected to the second silencing chamber.

16. The volute according to claim 15, characterized in that The second muffler cavity comprises a plurality of spaced-apart third sub-muffler cavities, and each of the third sub-muffler cavities has an opening communicating with the fan cavity on a wall surface facing the fan cavity.

17. The volute according to any one of claims 1 to 16, characterized in that: The height of the silencer chamber in the axial direction of the volute body is 2-20 mm.

18. The volute according to any one of claims 1 to 16, characterized in that: The opening extends along a radial direction of the mounting hole.

19. The volute according to any one of claims 1 to 16, characterized in that: The length of the opening along the radial direction of the mounting hole is greater than 1 / 4 of the width of the second sub-muffler cavity along the radial direction of the mounting hole and is not greater than the width of the second sub-muffler cavity along the radial direction of the mounting hole.

20. The volute according to any one of claims 1 to 16, characterized in that: The opening is a square hole or a fan-shaped hole.

21. The volute according to any one of claims 1 to 16, characterized in that: The width of the opening along the circumferential direction of the mounting hole is 1-5 mm.

22. The volute according to any one of claims 1 to 16, characterized in that: The axis of the opening is parallel to or at an angle to the axis of the volute body.

23. The volute according to any one of claims 1 to 16, characterized in that: The axis of the opening is a straight line or a spiral line.

24. The volute according to any one of claims 1 to 16, characterized in that: The volute body comprises: A main body, the fan chamber is arranged in the main body, the air inlet and the mounting hole are respectively arranged at two axial ends of the main body, and the opening is arranged on a side of the main body away from the air inlet and passes through the main body; A sealing cover plate is disposed on a side of the main body away from the air inlet and connected to the main body, and the silencer cavity is defined between the sealing cover plate and the main body.

25. A fan assembly, characterized in that: include: The volute according to any one of claims 1 to 24; A fan, wherein the fan is disposed in the fan cavity; A motor is arranged in the mounting hole and connected to the fan.

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