Volute, centrifugal fan and air conditioner

Abstract

The invention discloses a volute, a centrifugal fan and an air conditioner, the volute is used for the centrifugal fan, the volute comprises a coaming, the coaming comprises a main body section arranged in a spiral bending mode, an air outlet section and a volute tongue section, and the air outlet section and the volute tongue section are connected with the two ends of the main body section; one end, far away from the main body section, of the air outlet section is spaced from one end, far away from the main body section, of the volute tongue section so as to define an air outlet, and the volute tongue section is provided with a tongue tip point, a minimum air gap point and a connecting section for connecting the tongue tip point and the minimum air gap point; the volute tongue section is further provided with a protruding point located between the tongue tip point and the minimum air gap point, and the protruding point protrudes out of other parts of the connecting section in the direction perpendicular to the plane where the cross section of the air outlet is located. According to the technical scheme, the air volume of the centrifugal fan can be increased, and the requirement for miniaturization of the centrifugal fan is met.

Description

Technical Field

[0001] The present invention relates to the field of ventilation technology, and in particular to a volute, a centrifugal fan and an air conditioner. Background Art

[0002] With the development and progress of ventilation technology, especially the continuous development of fresh air air conditioning, users have put forward further requirements for the air volume, noise and miniaturization of the fresh air system. In general, in order to meet the noise requirements, the speed of the fresh air centrifugal fan cannot be too high. Since there is a contradiction between the large air volume and small size of the fan, how to achieve a fan system with a larger air volume within a smaller size range under a certain speed is a topic with important application value.

[0003] As one of the components of a centrifugal fan, the structure of the volute has a significant impact on the air volume and noise of the fan. The volute of an existing centrifugal fan includes a front cover, a rear cover and an intermediate enclosure connecting the front cover and the rear cover. The volute tongue is located near the air outlet of the intermediate enclosure. The volute tongue can prevent some gases from circulating in the volute. When the airflow at the outlet of the blade channel of the impeller passes near the volute tongue, the volute tongue will divert the airflow. Most of the airflow flows along the channel to the air outlet, and a small amount of airflow flows back to the volute through the gap between the volute tongue and the impeller. After rotating with the impeller for one circle in the volute, it returns to the volute to participate in new diversion. In the existing volute design, after the design of the volute helix and the outlet section is completed, a volute tongue is formed by making an arc transition at the top formed by the end of the volute helix and the outlet section, and different volute tongue schemes are obtained by adjusting the diameter of the top arc. In this type of design scheme, the minimum air gap of the volute tongue is at the arc. It is an industry consensus that the change in the radius of the arc at the top of the volute tongue has no obvious effect on the aerodynamic performance of the fan. Therefore, in this type of scheme, only adjusting the diameter of the top arc has no obvious effect on the fan performance, and it is impossible to achieve the ideal fan air volume or meet the demand for miniaturization of the fan. Summary of the invention

[0004] The main purpose of the present invention is to provide a volute, a centrifugal fan and an air conditioner, aiming to increase the air volume of the centrifugal fan and meet the miniaturization requirements of the centrifugal fan.

[0005] To achieve the above-mentioned purpose, the present invention provides a volute for a centrifugal fan, wherein the volute includes a surrounding plate, the surrounding plate includes a main body section arranged in a spiral shape, and an air outlet section and a volute tongue section connecting the two ends of the main body section, the air outlet section is away from the end of the main body section and the end of the volute tongue section is away from the main body section. The air outlet section is spaced apart from each other to define an air outlet, the volute tongue section has a tongue tip point and a minimum air gap point, and a connecting section connecting the tongue tip point and the minimum air gap point, and the volute tongue section is also provided with a protruding point located between the tongue tip point and the minimum air gap point, and in the plane direction perpendicular to the cross section of the air outlet, the protruding point protrudes from other parts of the connecting section.

[0006] Optionally, in the direction of the plane perpendicular to the cross section of the air outlet, the distance that the protruding point protrudes from the minimum air gap point is less than or equal to 3 mm.

[0007] Optionally, there is a first angle between the line connecting the center of the base circle of the volute and the minimum air gap point and the perpendicular line of the cross section of the air outlet, and there is a second angle between the line connecting the center of the base circle of the volute and the tongue tip point and the perpendicular line of the cross section of the air outlet, and the ratio of the first angle to the second angle is greater than or equal to 0 and less than or equal to 0.3.

[0008] Optionally, there is a third angle between the line connecting the center of the base circle of the volute and the protruding point and the perpendicular line of the cross section of the air outlet, and there is a second angle between the line connecting the center of the base circle of the volute and the tongue tip point and the perpendicular line of the cross section of the air outlet, and the ratio of the third angle to the second angle is greater than or equal to 0.5 and less than 1.

[0009] Optionally, the angle between the line between the center of the base circle of the volute and the tongue tip point and the perpendicular line of the cross section of the air outlet is greater than or equal to 25° and less than or equal to 40°.

[0010] Optionally, a perpendicular line of the cross section of the air outlet passes through the center of the base circle of the volute and has an intersection with the enclosure, and the volute tongue segment includes a smooth curve segment connecting the intersection, the minimum air gap point, the protruding point, and the tongue tip point.

[0011] Optionally, the end surface of the air outlet is arranged as a flat surface, and the cross section of the air outlet includes the end surface of the air outlet.

[0012] The present invention also provides a centrifugal fan, comprising an impeller and a volute as described above, wherein the impeller is arranged in the volute, and the center of the impeller coincides with the center of a base circle of the volute.

[0013] Optionally, the ratio of the air gap at the minimum air gap point to the radius of the impeller is greater than or equal to 0.06 and less than or equal to 0.1.

[0014] Optionally, the volute tongue segment includes an arc segment, the tongue tip point is formed on the arc segment, and the ratio of the radius of the arc segment to the radius of the impeller is greater than or equal to 0.03 and less than or equal to 0.08.

[0015] The present invention also provides an air conditioner, comprising the centrifugal fan as described above.

[0016] In the technical solution of the present invention, the volute includes a surrounding plate, the surrounding plate includes a main body section arranged in a spiral bend, and an air outlet section and a volute tongue section connecting the two ends of the main body section, the air outlet section is spaced apart from one end of the main body section and one end of the volute tongue section is spaced apart from the main body section to define an air outlet, the volute tongue section has a tongue tip point and a minimum air gap point, and a connecting section connecting the tongue tip point and the minimum air gap point, and the volute tongue section is also provided with a protruding point located between the tongue tip point and the minimum air gap point, and the protruding point protrudes in the plane direction perpendicular to the cross section of the air outlet. It is arranged in other parts of the connecting section, so that the minimum air gap point is arranged away from the tongue tip point, and a protruding point is also provided between the tongue tip point and the minimum air gap point, forming a special-shaped volute tongue section design, which reduces the impact of the airflow on the tongue tip point, reduces the airflow flow resistance, and improves the flow condition at the volute tongue section, thereby improving the workability of the centrifugal fan and increasing the air volume of the centrifugal fan. This special-shaped volute tongue section design is particularly suitable for fresh air centrifugal fans with very short outlet sections, and can meet the needs of miniaturization of centrifugal fans, thereby increasing the air volume of the centrifugal fan and meeting the needs of miniaturization of the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural perspective view of an embodiment of a centrifugal fan provided by the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of a top view of the structure of a centrifugal fan;

[0020] Figure 3 for Figure 1A schematic diagram of the structural cross section of a centrifugal fan;

[0021] Figure 4 for Figure 3 Schematic diagram of the partial structural cross section of the centrifugal fan.

[0022] Description of Figure Numbers:

[0023]

[0024]

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] With the development and progress of ventilation technology, especially the continuous development of fresh air air conditioning, users have put forward further requirements for the air volume, noise and miniaturization of the fresh air system. In general, in order to meet the noise requirements, the speed of the fresh air centrifugal fan cannot be too high. Since there is a contradiction between the large air volume and small size of the fan, how to achieve a fan system with a larger air volume within a smaller size range under a certain speed is a topic with important application value.

[0030] As one of the components of a centrifugal fan, the structure of the volute has a significant impact on the air volume and noise of the fan. The volute of an existing centrifugal fan includes a front cover, a rear cover and an intermediate enclosure connecting the front cover and the rear cover. The volute tongue is located near the air outlet of the intermediate enclosure. The volute tongue can prevent some gases from circulating in the volute. When the airflow at the outlet of the blade channel of the impeller passes near the volute tongue, the volute tongue will divert the airflow. Most of the airflow flows along the channel to the air outlet, and a small amount of airflow flows back to the volute through the gap between the volute tongue and the impeller. After rotating with the impeller for one circle in the volute, it returns to the volute to participate in new diversion. In the existing volute design, after the design of the volute helix and the outlet section is completed, a volute tongue is formed by making an arc transition at the top formed by the end of the volute helix and the outlet section, and different volute tongue schemes are obtained by adjusting the diameter of the top arc. In this type of design scheme, the minimum air gap of the volute tongue is at the arc. It is an industry consensus that the change in the radius of the arc at the top of the volute tongue has no obvious effect on the aerodynamic performance of the fan. Therefore, in this type of scheme, only adjusting the diameter of the top arc has no obvious effect on the fan performance, and it is impossible to achieve the ideal fan air volume or meet the demand for miniaturization of the fan.

[0031] In view of this, the present invention provides a volute, a centrifugal fan and an air conditioner, aiming to increase the air volume of the centrifugal fan and meet the miniaturization requirements of the centrifugal fan. Figures 1 to 4 This is an embodiment of the centrifugal fan provided by the present invention.

[0032] In the embodiments of the present invention, please refer to the accompanying drawings, especially to the accompanying drawings. Figure 4The volute 100 is used for a centrifugal fan 1000. The volute 100 includes a shroud 1. The shroud 1 includes a main body section 11 arranged in a spiral shape, and an air outlet section 13 and a volute tongue section 12 connecting the two ends of the main body section 11. The air outlet section 13 is spaced apart from one end of the main body section 11 and one end of the volute tongue section 12 is spaced apart from the main body section 11 to define an air outlet 4. The volute tongue section 12 has a tongue tip point C and a minimum air gap point B, and a connecting section connecting the tongue tip point C and the minimum air gap point B. The volute tongue section 12 is also provided with a protruding point D located between the tongue tip point C and the minimum air gap point B. In the plane direction perpendicular to the cross section X of the air outlet 4, the protruding point D is The outlet point D is arranged to protrude from other parts of the connecting section, so that the minimum air gap point B is arranged away from the tongue tip point C, and a protruding point D is further arranged between the tongue tip point C and the minimum air gap point B, forming a special-shaped volute tongue segment 12 design, which reduces the impact of the airflow on the tongue tip point C, reduces the airflow flow resistance, and improves the flow condition at the volute tongue segment 12, thereby improving the workability of the centrifugal fan 1000 and increasing the air volume of the centrifugal fan 1000. This special-shaped volute tongue segment 12 design is particularly suitable for the fresh air centrifugal fan 1000 with a very short outlet section, and can meet the miniaturization requirements of the centrifugal fan 1000, thereby increasing the air volume of the centrifugal fan 1000 and meeting the miniaturization requirements of the centrifugal fan 1000.

[0033] It should be noted that the enclosure 1 includes the main body section 11, and the air outlet section 13 and the volute tongue section 12 connecting the two ends of the main body section 11. The main body section 11 is the main part of the enclosure 1, which refers to the part corresponding to the impeller 200 and the enclosure 1 of the volute 100 after the impeller 200 is placed in the volute 100. The enclosure 1 of the volute 100 is spirally bent to form a shape that matches the impeller 200. Correspondingly, the shapes of the upper cover plate 2 of the volute 100 and the lower cover plate 3 of the volute 100 in this part are also matched with the enclosure 1 of the volute 100. It can be understood that the main body section 11 of the volute 100 is spirally bent and includes various forms, such as, all of the main body sections 11 are located on the same logarithmic spiral line, and the main body section 11 includes multiple enclosure sections connected in sequence, and the multiple enclosure sections are located on different logarithmic spiral lines and are formed by smooth connection, etc. In addition, the main body segment 11 is spirally bent, which means that the main body segment 11 is spirally bent as a whole, but it does not exclude that in some cases, the main body segment 11 is cut off to make way, for example, as shown in the attached Figure 3As shown, in order to control the size of the volute 100 and improve the airflow smoothness in the volute 100, a clearance cut is made on the main section 11, and the clearance cut forms the straight line section located at the top in the figure. In addition, the volute tongue section 12 refers to the part of the enclosure 1 that has the volute tongue function, and the volute tongue section 12 can only include a functional section that forms the volute tongue function, and the functional section and the air outlet section 13 define the air outlet 4; the volute tongue section 11 can also include a functional section and an air outlet matching section connected to one end of the functional section, the air outlet matching section is set away from the main section 11, and the air outlet matching section and the air outlet section 13 define the air outlet 4; the volute tongue section 12 can also include a transition section connected between the main section 11 and the functional section, and the transition section can be located on the spiral bending line of the main section 11 or the transition section can also be other curved sections connecting the main section 11 and the functional section. It should also be noted that the definition of the minimum air gap point B is a consensus in the industry. When the impeller 200 is installed in the volute 100, there is an air gap between the outer contour of the impeller 200 and the shroud 1. The minimum air gap point B is the point in the shroud 1 with the smallest air gap value between the outer contour of the impeller 200. The base circle of the volute 100 refers to the starting circle of the spiral bending of the main section 11 of the volute 100, which is also a consensus in the industry. In addition, the tongue tip point C is the most prominent point in the volute tongue section 12 toward the airflow side, or it can be understood that a straight line passing through the center O of the base circle has a tangent point with the volute tongue section 12 to form the tongue tip point C. The present technical solution mainly improves the volute tongue section 12. The definitions of the main section 11, the air outlet section 13, the minimum air gap point B, the base circle, and the tongue tip point C can be understood with reference to the prior art.

[0034] In this embodiment, in the plane direction perpendicular to the cross section X of the air outlet 4, the distance of the protruding point D protruding from the minimum air gap point B is less than or equal to 3 mm, that is, Figure 3 and Figure 4 As shown, the plane where the cross-section X of the air outlet 4 is located is understood as a horizontal plane, and the height difference h between the protruding point D and the minimum air gap point B is less than or equal to 3 mm. Controlling the height difference h between the protruding point D and the minimum air gap point B can better achieve the effect of increasing the air volume and is conducive to the miniaturization of the centrifugal fan 1000.

[0035] In this embodiment, Figure 3 and Figure 4As shown, there is a first angle a between the line connecting the center O of the base circle of the volute 100 and the minimum air gap point B and the perpendicular line Y of the cross section X of the air outlet 4 (it can be understood that the first angle a, the second angle b and the third angle c hereinafter are located on the same plane, and the selection of the perpendicular line Y of the cross section X of the air outlet 4 does not affect the size of the first angle a, the second angle b and the third angle c. For the convenience of description, the figure schematically shows the perpendicular line Y passing through the center O of the base circle of the volute 100), and there is a second angle b between the line connecting the center O of the base circle of the volute 100 and the tongue tip point C and the perpendicular line Y of the cross section X of the air outlet 4. The first angle a and The ratio of the second angle b is greater than or equal to 0 and less than or equal to 0.3. When the ratio of the first angle a and the second angle b is equal to 0, that is, the first angle a is equal to 0, that is, the vertical line Y and the enclosure 1 have an intersection A, and the minimum air gap point B coincides with the intersection A. The ratio of the first angle a and the second angle b is greater than 0 and less than or equal to 0.3, that is, the minimum air gap point B is between the intersection A and the tongue tip point C. By defining the first angle a and the second angle b and controlling the ratio, the positions of the minimum air gap point B and the tongue tip point C can be conveniently constrained. The volute tongue segment 12 set in this way can better achieve the effect of increasing the air volume and is conducive to the miniaturization of the centrifugal fan 1000.

[0036] Continue reading Figure 3 and Figure 4 In this embodiment, a third angle c is formed between a line connecting the center O of the base circle of the volute 100 and the protruding point D and a perpendicular line Y to the cross section X of the air outlet 4, a second angle b is formed between a line connecting the center O of the base circle of the volute 100 and the tongue tip point C and a perpendicular line Y to the cross section X of the air outlet 4, a ratio of the third angle c to the second angle b is greater than or equal to 0.5 and less than 1, that is, the angle of the third angle c is 0.5 to 1 of the angle of the second angle b, and a ratio of the third angle c to the second angle b is less than 1, that is, the protruding point D and the tongue tip point C do not overlap, and by defining the third angle c and the second angle b and controlling the ratio, the positions of the protruding point D and the tongue tip point C can be conveniently constrained, and the volute tongue segment 12 configured in this way can better achieve the effect of increasing the air volume and is conducive to the miniaturization of the centrifugal fan 1000. It can be understood that the above two embodiments can exist at the same time. By controlling the ratio of the first angle a and the second angle b, and the ratio of the third angle c and the second angle b, the positions of the minimum air gap point B, the protruding point D, and the tongue tip point C can be conveniently constrained. The volute tongue segment 12 set in this way can better achieve the effect of increasing the air volume and is conducive to the miniaturization of the centrifugal fan 1000.

[0037] In this embodiment, see Figure 3 and Figure 4 , the angle between the line between the center O of the base circle of the volute 100 and the tongue tip point C and the vertical line Y of the cross section X of the air outlet 4 is greater than or equal to 25° and less than or equal to 40°, that is, the second angle b is greater than or equal to 25° and less than or equal to 40°, which can conveniently constrain the position of the tongue tip point C. The volute tongue segment 12 set in this way can better achieve the effect of increasing the air volume and is conducive to the miniaturization of the centrifugal fan 1000. It can be understood that this embodiment can exist simultaneously with one of the above two embodiments, or can exist simultaneously with the above two embodiments. By controlling the size of the first angle a, the second angle b, and the third angle c, the position of the minimum air gap point B, the protruding point D, and the tongue tip point C can be conveniently constrained. The volute tongue segment 12 set in this way can better achieve the effect of increasing the air volume and is conducive to the miniaturization of the centrifugal fan 1000.

[0038] Continue reading Figure 3 and Figure 4 , a perpendicular line Y of the cross section X of the air outlet 4 passes through the center O of the base circle of the volute 100, and has an intersection A with the enclosure 1, the volute tongue segment 12 includes a smooth curve segment connecting the intersection A, the minimum air gap point B, the protruding point D, and the tongue tip point C, by determining the positions of the intersection A, the minimum air gap point B, the protruding point D and the tongue tip point C, and then smoothly connecting the above four points to determine the shape of the volute tongue segment 12, the volute tongue segment 12 includes a smooth curve segment, which reduces the air flow resistance and improves the gas flow of the volute tongue segment 12, so that the effect of increasing the air volume can be better achieved, and it is conducive to the miniaturization of the centrifugal fan 1000.

[0039] In this embodiment, see Figure 3 and Figure 4The end face of the air outlet 4 is set as a flat surface, and the cross-section X of the air outlet 4 includes the end face of the air outlet 4. In this way, it is convenient to constrain the protruding point D through the end face of the air outlet 4, thereby constraining the shape of the volute tongue segment 12. In the accompanying drawings, the end face of the air outlet 4 is set as a horizontal plane. It should be supplemented that, in other cases, for example, when the end face of the air outlet 4 is set as a non-straight surface, the cross-section X of the air outlet 4 is confirmed by other means. For example, when the main section 11 is located on a logarithmic spiral, the volute 100 has a spiral end section, and the cross-section X of the air outlet 4 is understood to be a straight surface parallel to the spiral end section. For example, the profile of the air outlet section 13 and the profile of the main section 11 have a tangent point E, and the cross-section X of the air outlet 4 is understood to be a straight surface parallel to the straight line passing through the center O of the base circle of the volute 100 and the tangent point E. For example, the cross-section X of the air outlet 4 can be understood as a straight surface perpendicular to the air outlet direction of the air outlet 4.

[0040] The present invention also provides a centrifugal fan 1000, which includes an impeller 200 and a volute 100 as described above, wherein the impeller 200 is arranged in the volute 100, and the center of the impeller 200 coincides with the center point O of the base circle of the volute 100. The specific arrangement of the volute 100 refers to all the above-mentioned embodiments. The centrifugal fan 1000 has the technical solutions of the above-mentioned embodiments, and therefore has at least the technical effects of all the above-mentioned embodiments, which will not be repeated here.

[0041] In this embodiment, the ratio of the air gap at the minimum air gap point B to the radius R of the impeller 200 is greater than or equal to 0.06 and less than or equal to 0.1, that is, the minimum air gap is 0.06 to 0.1 of the radius R of the impeller 200. It can be understood that if the air gap is too large, the working efficiency of the fan will decrease, the air volume will decrease, the noise will increase, and it may even directly affect the service life of the fan. If the air gap is too small, it will cause friction between the impeller 200 and the volute 100, inducing failure. By constraining the minimum air gap value, the centrifugal fan 1000 can have better working efficiency and be able to output a larger air volume.

[0042] The present technical solution does not limit the specific structure of the volute tongue segment 12. It can be understood that the volute tongue segment 12 includes a curved segment capable of forming the tongue tip point C. In the present embodiment, the curved segment of the volute tongue segment 12 capable of forming the tongue tip point C is an arc segment, and the ratio of the radius of the arc segment to the radius R of the impeller 200 is greater than or equal to 0.03 and less than or equal to 0.08, that is, the radius of the arc segment is 0.03 to 0.08 of the radius R of the impeller 200. The volute tongue segment 12 is arranged in this way, which can ensure that the pressure and efficiency of the centrifugal fan 1000 are high and the noise is low.

[0043] The following is a more detailed description of the technical solution with a specific embodiment. Figures 1 to 4 In the following description, the direction of the air outlet 4 of the volute 100 is taken as Figure 1 The normal direction of the cover plate 2 is taken as Figure 2 In this embodiment, the centrifugal fan 1000 includes an impeller 200 and a volute 100. The impeller 200 is installed in the volute 100. The radius R of the impeller 200 is 76 mm. The volute 100 includes an upper cover plate 2, a surrounding plate 1 and a lower cover plate 3. The volute 100 has an air inlet 5 and an air outlet 4. The upper cover plate 2 is provided with an air inlet 5. The surrounding plate 1 has a special-shaped volute tongue section 12 at the air outlet 4. The volute tongue segment 12 includes a smooth curve segment connecting the intersection A, the minimum air gap point B, the protruding point D, and the tongue tip point C, wherein the second angle b is 30°, the ratio of the first angle a to the second angle b is 0.25, the ratio of the third angle c to the second angle b is 0.8, and the distance from the protruding point D to the minimum air gap point B is 1.4 mm. Through the same test method, at a rotation speed of 2061RPM, the air volume of the existing volute tongue solution is 56.7CMH, and the air volume of the technical solution of the present application is 61.3CMH, and the air volume increase is 8.1%.

[0044] The present invention also provides an air conditioner, the air conditioner includes a centrifugal fan 1000, the specific configuration of the centrifugal fan 1000 refers to all the above embodiments, the air conditioner has the technical solutions of the above embodiments, and therefore has at least the technical effects of all the above embodiments, which will not be repeated here. The air conditioner has high requirements for air volume, noise, and miniaturization, and through the use of the centrifugal fan 1000, a more significant technical effect can be achieved.

[0045] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A volute for a centrifugal fan, characterized in that: The volute includes a surrounding plate, which includes a main body section arranged in a spiral bend, and an air outlet section and a volute tongue section connecting the two ends of the main body section. The air outlet section is spaced apart from one end of the main body section and one end of the volute tongue section is spaced apart from the main body section to define an air outlet. The volute tongue section has a tongue tip point and a minimum air gap point, and a connecting section connecting the tongue tip point and the minimum air gap point. The volute tongue section is also provided with a protruding point located between the tongue tip point and the minimum air gap point. In the plane direction perpendicular to the cross section of the air outlet, the protruding point protrudes from other parts of the connecting section.

2. The volute according to claim 1, characterized in that: In the direction of the plane perpendicular to the cross section of the air outlet, the distance that the protruding point protrudes from the minimum air gap point is less than or equal to 3 mm.

3. The volute according to claim 1, characterized in that: There is a first angle between the line connecting the center of the base circle of the volute and the minimum air gap point and the perpendicular line of the cross section of the air outlet, and there is a second angle between the line connecting the center of the base circle of the volute and the tongue tip point and the perpendicular line of the cross section of the air outlet, and the ratio of the first angle to the second angle is greater than or equal to 0 and less than or equal to 0.

3.

4. The volute according to claim 1, characterized in that: There is a third angle between the line connecting the center of the base circle of the volute and the protruding point and the perpendicular line of the cross section of the air outlet, and there is a second angle between the line connecting the center of the base circle of the volute and the tongue tip point and the perpendicular line of the cross section of the air outlet, and the ratio of the third angle to the second angle is greater than or equal to 0.5 and less than 1.

5. The volute according to any one of claims 1, characterized in that: The angle between the line between the center of the base circle of the volute and the tongue tip point and the perpendicular line of the cross section of the air outlet is greater than or equal to 25° and less than or equal to 40°.

6. The volute according to any one of claims 1, characterized in that: A perpendicular line of the cross section of the air outlet passes through the center of the base circle of the volute and has an intersection with the enclosure, and the volute tongue section includes a smooth curve section connecting the intersection, the minimum air gap point, the protruding point, and the tongue tip point.

7. The volute according to claim 1, characterized in that: The end surface of the air outlet is arranged as a flat surface, and the cross section of the air outlet includes the end surface of the air outlet.

8. A centrifugal fan, characterized in that: The centrifugal fan comprises an impeller and a volute according to any one of claims 1 to 7, wherein the impeller is arranged in the volute, and the center of the impeller coincides with the center of a base circle of the volute.

9. The centrifugal fan according to claim 8, characterized in that: The ratio of the air gap at the minimum air gap point to the radius of the impeller is greater than or equal to 0.06 and less than or equal to 0.

1.

10. The centrifugal fan according to claim 9, characterized in that: The volute tongue segment includes an arc segment, the tongue tip point is formed in the arc segment, and the ratio of the radius of the arc segment to the radius of the impeller is greater than or equal to 0.03 and less than or equal to 0.

08.

11. An air conditioner, characterized in that: The air conditioner comprises the centrifugal fan according to any one of claims 8 to 10.

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