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, airflow sound waves in the fan cavity can enter the noise reduction cavity through the open holes, the sound waves are reflected when reaching the closed boundary of the noise reduction cavity, the reflected sound waves can be overlapped with incident sound waves with opposite phases under the same frequency and offset the incident sound waves, the good noise reduction 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, which includes 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, the other axial end has a mounting hole for the motor, the side wall of the volute body at the end facing away from the air inlet has a silencer cavity arranged around the mounting hole, and the inner wall surface of the fan cavity at the end facing away from the air inlet has an opening connected to the silencer cavity.

[0006] According to the volute of the embodiment of the present invention, a fan cavity is provided in the volute body, and the fan is installed in the 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 mounting hole for a motor. The motor is used to drive the fan to rotate. Under the action of the fan, the airflow enters the fan cavity from the air inlet. The side wall of the volute body at the end away from the air inlet has a silencer cavity arranged around the mounting hole, and the inner wall surface of the fan cavity at the end away from the air inlet has an opening connected to the silencer cavity. The airflow sound waves in the fan cavity can enter the silencer cavity through the opening, and the sound waves are reflected when reaching the closed boundary of the 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.

[0007] 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.

[0008] In some embodiments of the present invention, the silencer chamber includes a first silencer chamber, which is in a circular ring shape arranged around the mounting hole, and the inner wall surface of the fan chamber at one end facing away from the air inlet has the opening connected to the first silencer chamber.

[0009] In some embodiments of the present invention, a first sealing rib is provided in the first silencer chamber, the first sealing rib is in a ring shape surrounding the mounting hole, and the first sealing rib is a plurality of ribs spaced apart along the radial direction of the first silencer chamber, and each of the first sealing ribs is connected to the inner wall of the first silencer chamber at both ends along the axial direction of the volute body, respectively, for dividing the first silencer chamber into a plurality of first sub-silencer chambers spaced apart along the radial direction of the first silencer chamber, and each of the first sub-silencer chambers has the opening connected to the fan chamber on the wall surface facing the fan chamber.

[0010] In some embodiments of the present invention, the thickness of the first sealing rib along the radial direction of the first silencing cavity is greater than or equal to 1 mm.

[0011] In some embodiments of the present invention, the width of the first sub-muffler cavity along the radial direction of the first muffler cavity is 6-20 mm.

[0012] In some embodiments of the present invention, each of the first sub-silence chambers has a plurality of second sealing ribs spaced apart along the circumferential direction of the first sub-silence chamber, and each of the second sealing ribs is connected to the inner wall of the first silencer chamber at both ends along the axial direction of the volute body, and each of the second sealing ribs is connected to two adjacent first sealing ribs at both ends along the radial direction of the first silencer chamber, so as to divide the first sub-silence chamber into a plurality of second sub-silence chambers spaced apart along the circumferential direction of the first sub-silence chamber, and each of the second sub-silence chambers has the opening connected to the fan chamber on the wall surface facing the fan chamber.

[0013] In some embodiments of the present invention, the thickness of the second sealing rib along the circumferential direction of the first muffler cavity is greater than or equal to 1 mm.

[0014] In some embodiments of the present invention, the second sealing rib extends along the radial direction of the first muffler cavity.

[0015] In some embodiments of the present invention, half of the sum of the lengths of the two side walls of the second sub-muffler cavity opposite to each other in the radial direction of the first muffler cavity in the circumferential direction of the first muffler cavity is L1, and L1 satisfies:

[0016]

[0017] Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, ρ is the air density, and the Laplace variable s = iω, ω Q =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L pis the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, v is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass at the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency.

[0018] 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 one end of the fan chamber facing away from the air inlet has the opening connected to the second silencer chamber.

[0019] In some embodiments of the present invention, the second silencer chamber includes a plurality of spaced-apart third sub-silencer chambers, wherein the third sub-silencer chambers extend along the circumferential direction of the first silencer chamber, and at least some of the third sub-silencer chambers are spaced along the radial direction of the first silencer chamber, and each of the third sub-silencer chambers has an opening connected to the fan chamber on the wall surface facing the fan chamber.

[0020] In some embodiments of the present invention, the width of the third sub-muffler cavity is 6-20 mm.

[0021] In some embodiments of the present invention, at least part of the third sub-silence chamber has a plurality of third sealing ribs spaced apart along the circumferential direction of the first silencer chamber, and each of the third sealing ribs is respectively connected to the inner wall of the third sub-silence chamber at both ends along the axial direction of the volute body, and each of the third sealing ribs is respectively connected to the inner wall of the third sub-silence chamber at both ends along the radial direction of the first silencer chamber, so as to divide the third sub-silence chamber into a plurality of fourth sub-silence chambers spaced apart along the circumferential direction of the first silencer chamber, and each of the fourth sub-silence chambers has the opening connected to the fan chamber on the wall surface facing the fan chamber.

[0022] In some embodiments of the present invention, half of the sum of the lengths of two side walls of the third sub-muffler chamber opposite to each other in the radial direction of the first muffler chamber in the circumferential direction of the first muffler chamber is L2, and L2 satisfies:

[0023]

[0024] Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, ρ is the air density, and the Laplace variable s = iω, ω Q =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P ris the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass at the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency.

[0025] In some embodiments of the present invention, the opening extends along a radial direction of the mounting hole.

[0026] In some embodiments of the present invention, the length of the opening along the radial direction of the mounting hole is greater than half the width of the muffler cavity where the opening is located along the radial direction of the mounting hole.

[0027] In some embodiments of the present invention, the opening is a square hole or a fan-shaped hole.

[0028] In some embodiments of the present invention, the width of the opening along the circumferential direction of the mounting hole is 1-5 mm.

[0029] 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.

[0030] In some embodiments of the present invention, the axis of the opening is a straight line or a spiral line.

[0031] 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 silencer chamber is defined between the sealing cover plate and the body part.

[0032] In some embodiments of the present invention, the muffler cavity covers the entire side wall of the volute body at one end facing away from the air inlet.

[0033] 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.

[0034] According to the fan assembly of the embodiment of the present invention, a fan cavity is provided in the volute body, and the fan is installed in the 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 mounting hole for the motor. The motor is used to drive the fan to rotate. Under the action of the fan, the airflow enters the fan cavity from the air inlet. The side wall of the volute body at the end away from the air inlet has a silencer cavity arranged around the mounting hole, and the inner wall surface of the fan cavity at the end away from the air inlet has an opening connected to the silencer cavity. The airflow sound waves in the fan cavity can enter the silencer cavity through the opening, and the sound waves are reflected when reaching the closed boundary of the 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.

[0035] 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

[0036] 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:

[0037] Figure 1 is a perspective view of a fan assembly according to an embodiment of the present invention;

[0038] Figure 2 is a three-dimensional diagram of a partial structure of a fan assembly according to an embodiment of the present invention;

[0039] Figure 3 is a three-dimensional diagram of a partial structure of a volute according to an embodiment of the present invention;

[0040] Figure 4 is a top view of a partial structure of a body portion of a volute according to an embodiment of the present invention;

[0041] Figure 5 is a bottom view of a partial structure of a body portion of a volute according to an embodiment of the present invention;

[0042] Figure 6 is a perspective view of a partial structure of a body portion of a volute according to an embodiment of the present invention;

[0043] Figure 7 is a three-dimensional diagram of a sealing cover plate of a volute according to an embodiment of the present invention;

[0044] Figure 8 is a top view of a sealing cover plate of a volute according to an embodiment of the present invention;

[0045] Fig. 9 1 is a three-dimensional view of the sealing cover plate of the volute according to an embodiment of the present invention from another angle.

[0046] Reference numerals:

[0047] 1000. Fan assembly;

[0048] 100. Snail case;

[0049] 1. Volute body;

[0050] 11. Main body; 111. Opening; 12. Sealing cover; 13. Fan cavity; 15. Mounting hole;

[0051] 2. Silencer chamber;

[0052] 21, first silencer chamber; 211, first sealing rib; 212, first sub-silencer chamber; 2121, second sealing rib; 2122, second sub-silencer chamber; 22, second silencer chamber; 221, third sub-silencer chamber; 222, third sealing rib; 223, fourth sub-silencer chamber;

[0053] 200. Fan. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The volute 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0058] like Figure 1 As shown, a volute 100 according to an embodiment of the present invention includes a volute body 1 .

[0059] Specifically, Figure 1 and Figure 2 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 15 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.

[0060] Optionally, the fan 200 may be a centrifugal wind wheel.

[0061] like Figure 3 , Figure 7-Figure 9 As shown, the side wall of the volute body 1 at one end away from the air inlet has a silencer cavity 2 arranged around the mounting hole 15, as shown in FIG. Figure 4-Figure 6 As shown, the inner wall surface of the end of the fan chamber 13 facing away from the air inlet is provided with 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. The sound waves are reflected when reaching the closed boundary of the silencer chamber 2. 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.

[0062] 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. One axial end of the volute body 1 has an air inlet connected to the fan chamber 13, and the other axial end has a motor mounting hole 15, and the motor is used to drive the fan 200 to rotate. Under the action of the fan 200, the airflow enters the fan chamber 13 from the air inlet. The side wall of the end of the volute body 1 away from the air inlet has a silencer chamber 2 arranged around the mounting hole 15, and the inner wall surface of the end of the fan chamber 13 away from the air inlet has an opening 111 connected to the silencer chamber 2. The airflow sound wave in the fan chamber 13 can enter the silencer chamber 2 through the opening 111, and the sound wave is reflected when reaching the closed boundary of the silencer chamber 2. The reflected sound wave can be superimposed and offset with the incident sound wave with the opposite phase at the same frequency, which can achieve a good silencer effect and enhance the user experience.

[0063] 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.

[0064] In some embodiments of the present invention, Figure 7-Figure 9 As shown, the silencing chamber 2 includes a first silencing chamber 21, which is a circular ring shaped around the mounting hole 15, so that the silencing chamber 2 can better absorb the noise generated by the airflow at various positions of the fan 200. An opening 111 connected to the first silencing chamber 21 is provided on the inner wall surface of the end of the fan chamber 13 away from the air inlet. The airflow sound waves in the fan chamber 13 can enter the first silencing chamber 21 through the opening 111, and the sound waves are reflected when reaching the closed boundary of the first silencing chamber 21. 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.

[0065] In some embodiments of the present invention, Figure 7 and Figure 8As shown, the first silencer chamber 21 has a first sealing rib 211 in it, and the first sealing rib 211 is annularly arranged around the mounting hole 15. There are multiple first sealing ribs 211 spaced apart along the radial direction of the first silencer chamber 21, and both ends of each first sealing rib 211 along the axial direction of the volute body 1 are respectively connected to the inner wall of the first silencer chamber 21, and are used to divide the first silencer chamber 21 into multiple first sub-silencer chambers 212 spaced apart along the radial direction of the first silencer chamber 21. The first sub-silencer chambers 212 form an annular silencer chamber, and each first sub-silencer chamber 212 has an opening 111 connected to the fan chamber 13 on the wall surface facing the fan chamber 13. That is to say, the airflow sound waves in the fan cavity 13 can enter the multiple first sub-silence chambers 212 through the opening 111, and the airflow sound waves in the fan cavity 13 can be dissipated in the multiple first sub-silence chambers 212. The sound waves are reflected when reaching the closed boundary of the first sub-silence chamber 212. 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.

[0066] In this embodiment, the fan 200 is a centrifugal wind wheel, and the annular first sub-muffler chamber 212 can better absorb the airflow sound waves brought by the rotation of the centrifugal wind wheel, so that the first sub-muffler chamber 212 has a better muffler effect.

[0067] In some embodiments of the present invention, the thickness of the first sealing rib 211 along the radial direction of the first muffler cavity 21 is greater than or equal to 1 mm. It is understandable that the thickness of the first sealing rib 211 along the radial direction of the first muffler cavity 21 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc., which can make the strength of the first sealing rib 211 greater and the structure of the first sub-muffler cavity 212 more reliable.

[0068] In some embodiments of the present invention, the width of the first sub-muffler cavity 212 along the radial direction of the first muffler cavity 21 is 6-20 mm. It is understandable that the width of the first sub-muffler cavity 212 along the radial direction of the first muffler cavity 21 can be 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 width of the first sub-silence chamber 212 along the radial direction of the first silencer chamber 21 is not less than 6 mm, so that the size of the first sub-silence chamber 212 can be larger, and the space available for sound wave reflection in the first sub-silence chamber 212 can be larger, so that the first sub-silence chamber 212 has a certain silencer effect; the width of the first sub-silence chamber 212 along the radial direction of the first silencer chamber 21 is not greater than 20 mm, which can avoid the size of the first sub-silence chamber 212 being too large, so that the first silencer chamber 21 can be divided into more first sub-silence chambers 212, and the airflow sound waves in the fan chamber 13 can be dissipated in multiple first sub-silence chambers 212, which can achieve a better silencer effect and enhance the user experience.

[0069] In some embodiments of the present invention, Figure 7 and Figure 8 As shown, each first sub-muffler chamber 212 has a plurality of second sealing ribs 2121 spaced apart along the circumferential direction of the first sub-muffler chamber 212, and each second sealing rib 2121 is connected to the inner wall of the first muffler chamber 21 at both ends along the axial direction of the volute body 1, and each second sealing rib 2121 is connected to two adjacent first sealing ribs 211 at both ends along the radial direction of the first muffler chamber 21, so as to divide the first sub-muffler chamber 212 into a plurality of second sub-muffler chambers 2122 spaced apart along the circumferential direction of the first sub-muffler chamber 212, and each second sub-muffler chamber 2122 has an opening 111 on the wall facing the fan chamber 13, which is connected to the fan chamber 13. That is to say, the airflow sound waves in the fan chamber 13 can enter the plurality of second sub-muffler chambers 2122 through the opening 111, and the airflow sound waves in the fan chamber 13 can be dissipated in the plurality of second sub-muffler chambers 2122, which can achieve a better muffler effect and enhance the user experience.

[0070] In some embodiments of the present invention, the thickness of the second sealing rib 2121 along the circumferential direction of the first muffler cavity 21 is greater than or equal to 1 mm. It is understandable that the thickness of the second sealing rib 2121 along the circumferential direction of the first muffler cavity 21 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc., which can make the second sealing rib 2121 stronger and the structure of the second sub-muffler cavity 2122 more reliable.

[0071] In some embodiments of the present invention, Figure 7 and Figure 8As shown, the second sealing rib 2121 extends along the radial direction of the first muffler cavity 21. The second sealing rib 2121 can divide the single annular first sub-sealed cavity into more second sub-sealed cavities, and the first muffler cavity 21 has a better muffler effect.

[0072] In some embodiments of the present invention, Figure 7 and Figure 8 As shown, in the axial direction of the silencer chamber 2, the two side surfaces of the second sealing rib 2121 along the circumferential direction of the first sub-silencer chamber 212 can be inclined toward the rotation direction of the fan 200, so as to avoid the airflow from contacting the sharp corners when blowing toward the second sealing rib 2121 driven by the fan 200 to produce a sharp whistle sound, thereby avoiding the generation of more noise.

[0073] In some embodiments of the present invention, half of the sum of the lengths of the two opposite side walls of the second sub-muffler chamber 2122 in the radial direction of the first muffler chamber 21 in the circumferential direction of the first muffler chamber 21 is L1, and L1 satisfies:

[0074]

[0075] Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, ρ is the air density, L1 is half of the sum of the lengths of the two opposite side walls of the second sub-muffler cavity 2122 in the radial direction of the first muffler cavity 21 in the circumferential direction of the first muffler cavity 21, which can be compared to the characteristic length of a quarter-wavelength tube, and the Laplace variable s=iω, ω Q =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass of the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency. At this time, the acoustic impedance of a single second sub-muffler cavity 2122 can reach that of a single quarter-wavelength tube, and the second sub-muffler cavity 2122 has a better muffler effect.

[0076] In some embodiments of the present invention, Figure 7-Figure 9As shown, the silencing chamber 2 also includes a second silencing chamber 22, which is located radially outside the first silencing chamber 21, and an opening 111 connected to the second silencing chamber 22 is provided on the inner wall surface of the end of the fan chamber 13 that is away from the air inlet. 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.

[0077] In some embodiments of the present invention, Figure 7 and Figure 8 As shown, the second muffler chamber 22 includes a plurality of spaced third sub-muffler chambers 221, the third sub-muffler chambers 221 extend along the circumferential direction of the first muffler chamber 21, at least part of the third sub-muffler chambers 221 are spaced along the radial direction of the first muffler chamber 21, and each third sub-muffler 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-muffler 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-muffler chambers 221, and the second muffler chamber 22 is provided with a plurality of third sub-muffler chambers 221 with a muffler effect, which can achieve a better muffler effect and enhance the user experience.

[0078] In some embodiments of the present invention, the width of the third sub-muffler chamber 221 is 6-20 mm. It is understandable that the width of the third sub-muffler chamber 221 can be 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 width of the third sub-muffler chamber 221 is not less than 6 mm, which can make the size of the third sub-muffler chamber 221 larger and ensure the silencing effect of the third sub-muffler chamber 221; the width of the third sub-muffler chamber 221 is not more than 20 mm, which can avoid the size of the third sub-muffler chamber 221 being too large, so that the second muffler chamber 22 can be divided into more third sub-muffler chambers 221, so that the airflow sound waves in the fan chamber 13 can be dissipated in the third sub-muffler chamber 221, which can achieve a better silencing effect and enhance the user experience.

[0079] In some embodiments of the present invention, Figure 7 and Figure 8As shown, at least part of the third sub-muffler chamber 221 has a plurality of third sealing ribs 222 spaced apart along the circumferential direction of the first muffler chamber 21, and both ends of each third sealing rib 222 along the axial direction of the volute body 1 are respectively connected to the inner wall of the third sub-muffler chamber 221, and both ends of each third sealing rib 222 along the radial direction of the first muffler chamber 21 are respectively connected to the inner wall of the third sub-muffler chamber 221, which is used to divide the third sub-muffler chamber 221 into a plurality of fourth sub-muffler chambers 223 spaced apart along the circumferential direction of the first muffler chamber 21, and each fourth sub-muffler chamber 223 has an opening 111 connected to the fan chamber 13 on the wall surface facing the fan chamber 13. In other words, the airflow sound waves in the fan chamber 13 can enter the plurality of fourth sub-muffler chambers 223 through the opening 111, and the airflow sound waves in the fan chamber 13 can be dissipated in the plurality of fourth sub-muffler chambers 223, which can achieve a better muffler effect and enhance the user experience.

[0080] In some embodiments of the present invention, in the axial direction of the silencer chamber 2, the two side surfaces of the third sealing rib 222 along the circumferential direction of the first sub-silencer chamber 212 can be inclined toward the rotation direction of the fan 200 to avoid the airflow from contacting the sharp corners when blowing toward the third sealing rib 222 driven by the fan 200 to produce a sharp whistle sound, thereby avoiding the generation of more noise.

[0081] In some embodiments of the present invention, half of the sum of the lengths of the two opposite side walls of the third sub-muffler chamber 221 in the radial direction of the first muffler chamber 21 in the circumferential direction of the first muffler chamber 21 is L2, and L2 satisfies:

[0082]

[0083] Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, ρ is the air density, L2 is half of the sum of the lengths of the two opposite side walls of the third sub-muffler cavity 221 in the radial direction of the first muffler cavity 21 in the circumferential direction of the first muffler cavity 21, which can be compared to the characteristic length of a quarter-wavelength tube, and the Laplace variable s=iω, ω Q =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass of the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency. At this time, the acoustic impedance of a single third sub-muffler cavity 221 can reach that of a single quarter-wavelength tube, and the third sub-muffler cavity 221 has a better muffler effect.

[0084] Of course, the present invention is not limited thereto, and a single fourth sub-muffler cavity 223 can also achieve the acoustic impedance of a single quarter-wavelength tube, and the fourth sub-muffler cavity 223 has a better muffler effect.

[0085] In some embodiments of the present invention, Figure 3 and Figure 5 As shown, the opening 111 extends in the radial direction of the mounting hole 15. That is, the length direction of the opening 111 is close to the radial direction of the mounting hole 15, 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.

[0086] In some embodiments of the present invention, the length of the opening 111 along the radial direction of the mounting hole 15 is greater than half the width of the silencer cavity where the opening 111 is located along the radial direction of the mounting hole 15. This allows the airflow sound waves in the fan cavity 13 to enter the silencer cavity from the opening 111 more smoothly, ensuring the silencer effect of the silencer cavity. At the same time, the length of the opening 111 along the radial direction of the mounting hole 15 is less than the width of the silencer cavity where the opening 111 is located along the radial direction of the mounting hole 15, so that each opening 111 can be connected only to the corresponding silencer cavity, protecting the silencer effect of the silencer cavity.

[0087] In some embodiments of the present invention, 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 15 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.

[0088] In some embodiments of the present invention, the width of the opening 111 along the circumferential direction of the mounting hole 15 is 1-5 mm. It is understandable that the width of the opening 111 along the circumferential direction of the mounting hole 15 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 15 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 15 is not greater than 5 mm, so that the silencing chamber 2 can have a larger boundary for sound wave reflection in the silencing chamber 2, ensuring the silencing effect of the silencing chamber 2.

[0089] 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 15 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 15 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.

[0090] 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.

[0091] In some embodiments of the present invention, Figure 3 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 15 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 processing and connecting the sealing cover plate 12 and the main body 11 separately, so that the processing of the silencer chamber 2 is more convenient. And the main body 11 can 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 15 and the opening 111 are separated, and the processing of the main body 11 is more convenient.

[0092] In some embodiments of the present invention, Figure 3 As shown, the silencing cavity 2 covers the side wall of the end of the volute body 1 away from the air inlet. The distribution area of ​​the silencing cavity 2 can be increased, so that more silencing cavities 2 can be arranged in the volute 100, thereby increasing the silencing effect of the volute 100.

[0093] 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.

[0094] like Figure 1 and Figure 2 As shown, a volute 100 according to an embodiment of the present invention includes a volute body 1 .

[0095] Specifically, 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 15 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.

[0096] Optionally, the fan 200 may be a centrifugal wind wheel.

[0097] A silencer chamber 2 arranged around the mounting hole 15 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, and the sound waves are reflected when reaching the closed boundary of the silencer chamber 2. 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.

[0098] The height of the silencer chamber 2 in the axial direction of the volute body 1 is 2-20 mm. The silencer chamber 2 includes a first silencer chamber 21. The first silencer chamber 21 is a circular ring arranged around the mounting hole 15, so that the silencer chamber 2 can better absorb the noise generated by the airflow at various positions of the fan 200. An opening 111 connected to the first silencer chamber 21 is provided on the inner wall surface of the end of the fan chamber 13 away from the air inlet. The airflow sound waves in the fan chamber 13 can enter the first silencer chamber 21 through the opening 111. The sound waves are reflected when they reach the closed boundary of the first silencer chamber 21. 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.

[0099] The first silencer chamber 21 has a first sealing rib 211 therein, and the first sealing rib 211 is annularly arranged around the mounting hole 15. There are multiple first sealing ribs 211 spaced apart along the radial direction of the first silencer chamber 21, and both ends of each first sealing rib 211 along the axial direction of the volute body 1 are respectively connected to the inner wall of the first silencer chamber 21, so as to divide the first silencer chamber 21 into multiple first sub-silencer chambers 212 spaced apart along the radial direction of the first silencer chamber 21, and the first sub-silencer chambers 212 form an annular silencer chamber, and each first sub-silencer chamber 212 has an opening 111 on the wall surface facing the fan chamber 13, which is connected to the fan chamber 13. That is to say, the airflow sound waves in the fan cavity 13 can enter the multiple first sub-muffler cavities 212 through the opening 111, and the airflow sound waves in the fan cavity 13 can be dissipated in the multiple first sub-muffler cavities 212. The sound waves are reflected when they reach the closed boundary of the first sub-muffler cavity 212. 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. The fan 200 is a centrifugal wind wheel, and the annular first sub-muffler cavity 212 can better absorb the airflow sound waves brought by the rotation of the centrifugal wind wheel, so that the muffler effect of the first sub-muffler cavity 212 is better. The thickness of the first sealing rib 211 along the radial direction of the first muffler cavity 21 is greater than or equal to 1mm, and the width of the first sub-muffler cavity 212 along the radial direction of the first muffler cavity 21 is 6-20mm.

[0100] Each first sub-muffler chamber 212 has a plurality of second sealing ribs 2121 spaced apart along the circumferential direction of the first sub-muffler chamber 212, and the two ends of each second sealing rib 2121 along the axial direction of the volute body 1 are respectively connected to the inner wall of the first muffler chamber 21, and the two ends of each second sealing rib 2121 along the radial direction of the first muffler chamber 21 are respectively connected to two adjacent first sealing ribs 211, which are used to divide the first sub-muffler chamber 212 into a plurality of second sub-muffler chambers 2122 spaced apart along the circumferential direction of the first sub-muffler chamber 212, and each second sub-muffler chamber 2122 has an opening 111 connected to the fan chamber 13 on the wall surface facing the fan chamber 13. In other words, the airflow sound waves in the fan chamber 13 can enter the plurality of second sub-muffler chambers 2122 through the opening 111, and the airflow sound waves in the fan chamber 13 can be dissipated in the plurality of second sub-muffler chambers 2122, which can achieve a better muffler effect and enhance the user experience. The thickness of the second sealing rib 2121 along the circumferential direction of the first muffler cavity 21 is greater than or equal to 1 mm. The second sealing rib 2121 extends along the radial direction of the first muffler cavity 21. The second sealing rib 2121 can divide the single annular first sub-sealed cavity into more second sub-sealed cavities, and the first muffler cavity 21 has a better muffler effect.

[0101] In the axial direction of the silencer chamber 2, the two side surfaces of the second sealing rib 2121 along the circumferential direction of the first sub-silencer chamber 212 can be inclined toward the rotation direction of the fan 200 to avoid the airflow from contacting the sharp corners when blowing toward the second sealing rib 2121 driven by the fan 200 to produce a sharp whistle sound, thereby avoiding the generation of more noise.

[0102] Half of the sum of the lengths of the two side walls of the second sub-muffler chamber 2122 opposite to each other in the radial direction of the first muffler chamber 21 in the circumferential direction of the first muffler chamber 21 is L1, and L1 satisfies:

[0103]

[0104] Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, ρ is the air density, L1 is half of the sum of the lengths of the two opposite side walls of the second sub-muffler cavity 2122 in the radial direction of the first muffler cavity 21 in the circumferential direction of the first muffler cavity 21, which can be compared to the characteristic length of a quarter-wavelength tube, and the Laplace variable s=iω, ω Z =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass of the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency. At this time, the acoustic impedance of a single second sub-muffler cavity 2122 can reach that of a single quarter-wavelength tube, and the second sub-muffler cavity 2122 has a better muffler effect.

[0105] The silencer chamber 2 also includes a second silencer chamber 22, which is located radially outside the first silencer chamber 21. An opening 111 connected to the second silencer chamber 22 is provided on the inner wall surface of the end of the fan chamber 13 that is away from the air inlet. The airflow sound waves radially outside the fan 200 in the fan chamber 13 can enter the second silencer chamber 22 through the opening 111, and the sound waves are reflected when reaching the closed boundary of the second silencer 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.

[0106] The second muffler cavity 22 includes a plurality of spaced third sub-muffler cavities 221, the third sub-muffler cavities 221 extend along the circumferential direction of the first muffler cavity 21, at least part of the third sub-muffler cavities 221 are spaced along the radial direction of the first muffler cavity 21, and each third sub-muffler cavity 221 has an opening 111 connected to the fan cavity 13 on the wall surface facing 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, and 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. The width of the third sub-muffler cavity 221 is 6-20 mm.

[0107] At least part of the third sub-muffler chamber 221 has a plurality of third sealing ribs 222 spaced apart along the circumferential direction of the first muffler chamber 21, and both ends of each third sealing rib 222 along the axial direction of the volute body 1 are respectively connected to the inner wall of the third sub-muffler chamber 221, and both ends of each third sealing rib 222 along the radial direction of the first muffler chamber 21 are respectively connected to the inner wall of the third sub-muffler chamber 221, which is used to divide the third sub-muffler chamber 221 into a plurality of fourth sub-muffler chambers 223 spaced apart along the circumferential direction of the first muffler chamber 21, and each fourth sub-muffler chamber 223 has an opening 111 connected to the fan chamber 13 on the wall surface facing the fan chamber 13. In other words, the airflow sound waves in the fan chamber 13 can enter the plurality of fourth sub-muffler chambers 223 through the opening 111, and the airflow sound waves in the fan chamber 13 can be dissipated in the plurality of fourth sub-muffler chambers 223, which can achieve a better muffler effect and enhance the user experience.

[0108] In the axial direction of the silencer chamber 2, the two side surfaces of the third sealing rib 222 along the circumferential direction of the first sub-silencer chamber 212 can be inclined toward the rotation direction of the fan 200 to avoid the airflow from contacting the sharp corners when blowing toward the third sealing rib 222 driven by the fan 200 to produce a sharp whistle sound, thereby avoiding the generation of more noise.

[0109] Half of the sum of the lengths of the two opposite side walls of the third sub-muffler chamber 221 in the radial direction of the first muffler chamber 21 in the circumferential direction of the first muffler chamber 21 is L2, and L2 satisfies:

[0110]

[0111] Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, ρ is the air density, L2 is half of the sum of the lengths of the two opposite side walls of the third sub-muffler cavity 221 in the radial direction of the first muffler cavity 21 in the circumferential direction of the first muffler cavity 21, which can be compared to the characteristic length of a quarter-wavelength tube, and the Laplace variable s=iω, ωQ =c / 2L is the resonant angular frequency of the quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass of the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency. At this time, the acoustic impedance of a single third sub-muffler cavity 221 can reach that of a single quarter-wavelength tube, and the third sub-muffler cavity 221 has a better muffler effect.

[0112] Of course, the present invention is not limited thereto, and a single fourth sub-muffler cavity 223 can also achieve the acoustic impedance of a single quarter-wavelength tube, and the fourth sub-muffler cavity 223 has a better muffler effect.

[0113] The opening 111 extends along the radial direction of the mounting hole 15. That is to say, the length direction of the opening 111 is close to the radial direction of the mounting hole 15, so that the size of the opening 111 can be smaller than that of the silencer cavity, and the silencer cavity can have a better silencer effect. The length of the opening 111 along the radial direction of the mounting hole 15 is greater than half of the width of the silencer cavity 2 along the radial direction of the mounting hole 15 where the opening 111 is located. The airflow sound waves in the fan cavity 13 can enter the silencer cavity 2 from the opening 111 more smoothly, ensuring the silencer effect of the silencer cavity 2. At the same time, the length of the opening 111 along the radial direction of the mounting hole 15 is less than the width of the silencer cavity 2 along the radial direction of the mounting hole 15 where the opening 111 is located, so that each opening 111 can be connected only to the corresponding silencer cavity, protecting the silencer effect of the silencer cavity. The opening 111 is a fan-shaped hole. The width of the opening 111 along the circumferential direction of the mounting hole 15 is 1-5mm.

[0114] The axis of the opening 111 is at an angle to the axis of the volute body 1, and 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 15 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 axis of the opening 111 is a straight line, and the axis of the opening 111 can be processed as a straight line.

[0115] 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 15 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 muffler chamber 2 is arranged on the side of the body 11 away from the air inlet and communicates with the opening 111, and the airflow sound waves can enter the muffler chamber 2 from the opening 111 along the axial direction of the body 11 relatively smoothly, thereby ensuring the muffler 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 connected to the body 11, and the muffler chamber 2 is defined between the sealing cover plate 12 and the body 11. The muffler chamber 2 can be obtained by processing and connecting the two parts of the sealing cover plate 12 and the body 11 separately, so that the processing of the muffler chamber 2 is more convenient. The main body 11 can be composed of two half shells split in the axial direction, so that the processing of the air inlet and the processing of the mounting hole 15 and the opening 111 are split, and the processing of the main body 11 is more convenient. The silencing cavity 2 covers the side wall of the end of the volute body 1 away from the air inlet. The distribution area of ​​the silencing cavity 2 can be increased, so that more silencing cavities 2 can be arranged in the volute 100, thereby increasing the silencing effect of the volute 100.

[0116] The fan assembly 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0117] 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 15 and connected to the fan 200, and the motor can drive the fan 200 to rotate.

[0118] 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. 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 motor mounting hole 15, and 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. The side wall of the end of the volute body 1 away from the air inlet has a silencer cavity 2 arranged around the mounting hole 15, and the inner wall surface of the end of the fan cavity 13 away from the air inlet has an opening 111 connected to the silencer cavity 2. The airflow sound wave in the fan cavity 13 can enter the silencer cavity 2 through the opening 111, and the sound wave is reflected when reaching the closed boundary of the silencer cavity 2. The reflected sound wave can be superimposed and offset with the incident sound wave with the opposite phase at the same frequency, which can achieve a good silencing effect and enhance the user experience.

[0119] In some embodiments of the present invention, the silencer chamber 2 includes a first silencer chamber 21, which is a circular ring-shaped chamber arranged around the mounting hole 15. The outer diameter of the first silencer chamber 21 is compared with the outer diameter of the fan 200. The outer diameter of the first silencer chamber 21 can be 50 mm smaller than the outer diameter of the fan 200, or the outer diameter of the first silencer chamber 21 can be 100 mm larger than the outer diameter of the fan 200, so that the silencer range of the first silencer chamber 21 is larger.

[0120] 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.

[0121] 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.

[0122] 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, one axial end of the volute body has an air inlet connected to the fan cavity, the other axial end has a mounting hole for a motor, the side wall of the volute body at the end facing away from the air inlet has a silencer cavity arranged around the mounting hole, and the inner wall surface of the fan cavity at the end facing away from the air inlet has an opening connected to the silencer cavity.

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

3. The volute according to claim 1, characterized in that: The silencing chamber comprises a first silencing chamber, which is in a circular shape surrounding the mounting hole, and the inner wall surface of one end of the fan chamber away from the air inlet is provided with the opening connected to the first silencing chamber.

4. The volute according to claim 3, characterized in that: The first silencer chamber has a first sealing rib in the form of a ring surrounding the mounting hole. The first sealing rib is a plurality of first sealing ribs spaced apart along the radial direction of the first silencer chamber, and each of the first sealing ribs is connected to the inner wall of the first silencer chamber at both ends along the axial direction of the volute body, respectively, for dividing the first silencer chamber into a plurality of first sub-silencer chambers spaced apart along the radial direction of the first silencer chamber, and each of the first sub-silencer chambers has an opening connected to the fan chamber on the wall surface facing the fan chamber.

5. The volute according to claim 4, characterized in that: The thickness of the first sealing rib along the radial direction of the first silencing cavity is greater than or equal to 1 mm.

6. The volute according to claim 4, characterized in that: The width of the first sub-muffler cavity along the radial direction of the first muffler cavity is 6-20 mm.

7. The volute according to claim 4, characterized in that: Each of the first sub-silencer chambers has a plurality of second sealing ribs spaced apart along the circumferential direction of the first sub-silencer chamber, and each of the second sealing ribs is connected to the inner wall of the first silencer chamber at both ends along the axial direction of the volute body, and each of the second sealing ribs is connected to two adjacent first sealing ribs at both ends along the radial direction of the first silencer chamber, so as to divide the first sub-silencer chamber into a plurality of second sub-silencer chambers spaced apart along the circumferential direction of the first sub-silencer chamber, and each of the second sub-silencer chambers has an opening connected to the fan chamber on the wall surface facing the fan chamber.

8. The volute according to claim 7, characterized in that: The thickness of the second sealing rib along the circumferential direction of the first silencing chamber is greater than or equal to 1 mm.

9. The volute according to claim 7, characterized in that: The second sealing rib extends along the radial direction of the first muffler chamber.

10. The volute according to claim 7, characterized in that: Half of the sum of the lengths of the two side walls of the second sub-muffler cavity opposite to each other in the radial direction of the first muffler cavity in the circumferential direction of the first muffler cavity is L1, and L1 satisfies: Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, σ is the air density, and the Laplace variable s = iω, ω Q =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass at the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency.

11. The volute according to claim 3, 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 is provided with the opening connected with the second silencing chamber.

12. The volute according to claim 11, characterized in that: The second silencer chamber includes a plurality of spaced-apart third sub-silencer chambers, wherein the third sub-silencer chambers extend along the circumferential direction of the first silencer chamber, and at least some of the third sub-silencer chambers are spaced along the radial direction of the first silencer chamber. Each of the third sub-silencer chambers has an opening connected to the fan chamber on the wall surface facing the fan chamber.

13. The volute according to claim 12, characterized in that: The width of the third sub-muffler cavity is 6-20 mm.

14. The volute according to claim 12, characterized in that: At least part of the third sub-silence chamber has a plurality of third sealing ribs spaced apart along the circumferential direction of the first silencer chamber, and both ends of each of the third sealing ribs along the axial direction of the volute body are respectively connected to the inner wall of the third sub-silence chamber, and both ends of each of the third sealing ribs along the radial direction of the first silencer chamber are respectively connected to the inner wall of the third sub-silence chamber, so as to divide the third sub-silence chamber into a plurality of fourth sub-silence chambers spaced apart along the circumferential direction of the first silencer chamber, and each of the fourth sub-silence chambers has the opening connected to the fan chamber on the wall surface facing the fan chamber.

15. The volute according to claim 12, characterized in that: Half of the sum of the lengths of the two side walls of the third sub-muffler chamber opposite to each other in the radial direction of the first muffler chamber in the circumferential direction of the first muffler chamber is L2, and L2 satisfies: Among them, Z HH represents the acoustic impedance of a single quarter-wavelength tube, σ is the air density, and the Laplace variable s = iω, ω Q =πc / 2L is the resonant angular frequency of a quarter-wavelength tube, L p is the actual length of the quarter-wavelength tube, w is the characteristic width of the quarter-wavelength tube opening, υ is the dynamic viscosity of air, γ is the specific heat rate, P r is the Prandtl number, ζ Q is the pressure loss coefficient, is the average airflow mass at the opening, A is the opening cross-sectional area, and ω is the excitation angular frequency.

16. The volute according to any one of claims 1 to 15, characterized in that: The opening extends along a radial direction of the mounting hole.

17. The volute according to any one of claims 1 to 15, characterized in that: The length of the opening along the radial direction of the mounting hole is greater than half the width of the muffler cavity where the opening is located along the radial direction of the mounting hole.

18. The volute according to any one of claims 1 to 15, characterized in that: The opening is a square hole or a fan-shaped hole.

19. The volute according to any one of claims 1 to 15, characterized in that: The width of the opening along the circumferential direction of the mounting hole is 1-5 mm.

20. The volute according to any one of claims 1 to 15, characterized in that: The axis of the opening is parallel to or at an angle to the axis of the volute body.

21. The volute according to any one of claims 1 to 15, characterized in that: The axis of the opening is a straight line or a spiral line.

22. The volute according to any one of claims 1 to 15, 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 silencing cavity is defined between the sealing cover plate and the main body.

23. The volute according to claim 3, characterized in that The muffler cavity covers the side wall of the volute body at one end away from the air inlet.

24. A fan assembly, characterized in that: include: The volute according to any one of claims 1 to 23; 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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