Volute, centrifugal fan and air conditioner

Abstract

The present invention provides a volute, a centrifugal fan and an air conditioner, wherein the volute has an air inlet, a receiving chamber, a first air outlet and a first air outlet duct, the receiving chamber is used to receive an impeller, the receiving chamber is connected to the air inlet, the first air outlet is connected to a circumferential portion of the receiving chamber through the first air outlet duct, and the first air outlet duct has a guide surface, the guide surface includes an inner guide surface and an outer guide surface connected to each other, the inner guide surface extends from the circumferential side of the receiving chamber toward the other side opposite to the air inlet, and the outer guide surface extends outward relative to the connection between the inner guide surface and the outer guide surface to reduce the impact of the airflow on the guide surface. The inner guide surface of the present invention is used to change the flow direction of the airflow, and the outer guide surface hardly changes the flow direction of the airflow, so that the airflow has little impact on the guide surface when it flows through the outer guide surface, thereby preventing the airflow from continuously impacting the guide surface, reducing the continuous impact of the airflow on the guide surface when it flows out, reducing noise, and improving user experience satisfaction.

Description

Technical Field

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

[0002] With the development of the air-conditioning industry, more and more air-conditioning cabinet products that can achieve upward and downward air outlets are appearing on the market, and most of these products use centrifugal fans. The centrifugal fan includes a volute and an impeller. The volute has an air inlet, a receiving chamber, an air outlet and an air outlet duct. The impeller is arranged in the receiving chamber, and the air outlet is connected to the circumferential part of the receiving chamber through the air outlet duct. One wall of the air outlet duct is a guide arc surface extending from the circumference of the impeller to the rear side, wherein the rear side refers to the other side opposite to the air inlet. The airflow is sucked in by the impeller from the front side where the air inlet is located, thrown out from the circumference of the impeller, and then flows to the rear side along the guide arc surface. Since the guide arc surface is single and continuous, the airflow continuously impacts the guide arc surface when it flows out, and the noise is relatively large. Summary of the invention

[0003] The main purpose of the present invention is to provide a volute, a centrifugal fan and an air conditioner to solve the problem in the prior art that the airflow continuously impacts the guide arc surface when it flows out, causing relatively large noise.

[0004] To achieve the above-mentioned objectives, the present invention provides a volute, comprising an air inlet, a accommodating chamber, a first air outlet and a first air outlet duct, the accommodating chamber being used to accommodate an impeller, the accommodating chamber being connected to the air inlet, the first air outlet being connected to a circumferential portion of the accommodating chamber through the first air outlet duct, the first air outlet having a guide surface, the guide surface comprising an inner guide surface and an outer guide surface connected to each other, the inner guide surface extending from the circumferential side of the accommodating chamber toward the other side opposite to the air inlet, and the outer guide surface extending outward relative to the connection between the inner guide surface and the outer guide surface to weaken the impact of the airflow on the guide surface.

[0005] Furthermore, the inner guide surface is a curved surface, and the first air outlet duct further has a first wall surface arranged opposite to the inner guide surface, and the distance between the inner guide surface and the first wall surface gradually decreases from the inside to the outside.

[0006] Further, one side edge of the curved surface connected to the volute tongue of the volute is arranged close to the first wall surface relative to the other side edge of the curved surface, and / or the inner guide surface is a curved surface.

[0007] Furthermore, the outer guide surface is an inclined surface inclined relative to the axis of the impeller.

[0008] Furthermore, the angle between the inclined surface and the axis of the impeller is in the range of 50° to 65°.

[0009] Furthermore, the width of the inner guide surface gradually increases along the air outlet direction of the first air outlet duct.

[0010] Furthermore, the volute also has a volute tongue, and the starting point and the outer edge of the inner guide surface are respectively located on the inner side and the outer side of the horizontal plane where the tangent line of the side surface of the volute tongue facing the accommodating chamber is located.

[0011] Furthermore, a distance H1 between a starting point of the inner guide surface and a horizontal plane is in a range of 50 mm to 60 mm.

[0012] Furthermore, the maximum distance between a point on the outer edge of the inner guide surface and the horizontal plane is H2, and H2=H1.

[0013] Furthermore, the guide surface also includes a middle guide surface connected between the inner guide surface and the outer guide surface, and the middle guide surface is a straight surface extending in the vertical direction.

[0014] Further, the height H3 of the middle guide surface is equal to the distance H1 between the starting point of the inner guide surface and the horizontal plane.

[0015] Furthermore, the volute also has a second wall surface and a third wall surface that are arranged opposite to each other, and the second wall surface and the third wall surface are respectively connected to the two side edges of the guide surface. The volute also has a guide cover, and the two side edges of the guide cover surface of the guide cover are respectively connected to the second wall surface and the third wall surface, and the inner side of the guide cover surface is connected to the outer side of the first wall surface.

[0016] Furthermore, the guide cover surface includes a first guide cover surface and a second guide cover surface, one side of the first guide cover surface is connected to the second wall surface, the other side of the first guide cover surface is connected to one side of the second guide cover surface, the other side of the second guide cover surface is connected to the third wall surface, and the first guide cover surface is parallel to the outer guide surface.

[0017] Furthermore, the guide surface also includes a middle guide surface connected between the inner guide surface and the outer guide surface, the innermost point on the first guide cover surface and the innermost point on the middle guide surface are in the same horizontal plane, or the innermost point on the first guide cover surface is 10mm~20mm lower than the innermost point on the middle guide surface.

[0018] Furthermore, a height H4 of the first air guide cover surface along the vertical direction is in the range of 85 mm to 95 mm.

[0019] Furthermore, the air guide cover surface also includes a third air guide cover surface, the third air guide cover surface is connected to the outer edge of the first air guide cover surface and the outer edge of the second air guide cover surface, and the third air guide cover surface is a straight surface extending in the vertical direction.

[0020] Furthermore, a height H5 of the third air guide cover surface along the vertical direction is in the range of 40 mm to 50 mm.

[0021] Furthermore, the first wall surface is a straight surface extending in the vertical direction.

[0022] Furthermore, the first air outlet is an upper air outlet.

[0023] Furthermore, the volute also has a second air outlet and a second air outlet duct, the second air outlet is connected with a circumferential portion of the accommodating cavity through the second air outlet duct, and the second air outlet is a lower air outlet.

[0024] The present invention also provides a centrifugal fan, comprising the above-mentioned volute.

[0025] The present invention also provides an air conditioner, comprising the centrifugal fan.

[0026] The technical solution of the present invention has the following advantages: the airflow is sucked in by the impeller from the air inlet, thrown out from the circumference of the impeller, and then flows along the guide surface to the other side opposite to the air inlet, the guide surface includes an inner guide surface and an outer guide surface, the inner guide surface extends from the circumference of the accommodating cavity toward the other side opposite to the air inlet, and the outer guide surface extends outward relative to the connection between the inner guide surface and the outer guide surface. The inner guide surface and the outer guide surface are discontinuous arc-shaped surfaces, the inner guide surface is used to change the flow direction of the airflow, and the outer guide surface is used to guide the airflow flowing out of the inner guide surface to the first air outlet, and the flow direction of the airflow is almost not changed, so that the airflow has little impact on the guide surface when flowing through the outer guide surface, thereby preventing the airflow from continuously impacting the guide surface, weakening the continuous impact of the airflow on the guide surface when it flows out, reducing noise, and improving user experience satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic front view of the volute provided by the present invention is shown;

[0029] Figure 2 Shows Figure 1 A schematic side view of a volute;

[0030] Figure 3 Shows Figure 1 The main schematic diagram of the left volute of the volute;

[0031] Figure 4 Shows Figure 1 A schematic front view of the right volute of the volute;

[0032] Figure 5 Shows Figure 1 A schematic cross-sectional view of a volute;

[0033] Figure 6 Shows Figure 1 Schematic diagram of the air outlet of the volute.

[0034] Description of reference numerals:

[0035] 11. Accommodating cavity; 12. First air outlet; 13. First air outlet duct; 131. Inner guide surface; 132. Outer guide surface; 133. Middle guide surface; 134. First wall surface; 14. Snail tongue; 15. Guide cover; 151. First guide cover surface; 152. Second guide cover surface; 153. Third guide cover surface; 16. Second air outlet; 17. Second air outlet duct. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] 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.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] like Figures 1 to 3 and Figure 6As shown, the volute of this embodiment has an air inlet, a accommodating chamber 11, a first air outlet 12 and a first air outlet duct 13. The accommodating chamber 11 is used to accommodate an impeller. The accommodating chamber 11 is connected to the air inlet. The first air outlet 12 is connected to a circumferential part of the accommodating chamber 11 through the first air outlet duct 13. The first air outlet duct 13 has a guide surface, and the guide surface includes an inner guide surface 131 and an outer guide surface 132 connected to each other. The inner guide surface 131 extends from the circumferential side of the accommodating chamber 11 toward the other side opposite to the air inlet, and the outer guide surface 132 extends outward relative to the connection between the inner guide surface 131 and the outer guide surface 132 to reduce the impact of the airflow on the guide surface.

[0041] With the volute of this embodiment, the airflow is sucked in by the impeller from the air inlet, thrown out from the circumference of the impeller, and then flows along the guide surface to the other side opposite to the air inlet. The guide surface includes an inner guide surface 131 and an outer guide surface 132. The inner guide surface 131 extends from the circumference of the accommodating cavity 11 toward the other side opposite to the air inlet, and the outer guide surface 132 extends outward relative to the connection between the inner guide surface 131 and the outer guide surface 132. The inner guide surface 131 and the outer guide surface 132 are discontinuous arc-shaped surfaces. The inner guide surface 131 is used to change the flow direction of the airflow, and the outer guide surface 132 is used to guide the airflow flowing out of the inner guide surface 131 to the first air outlet 12, and the flow direction of the airflow is almost not changed. In this way, when the airflow flows through the outer guide surface 132, the impact on the guide surface is very small, so that the airflow will not continuously impact the guide surface, weaken the continuous impact of the airflow on the guide surface when it flows out, reduce noise, and improve user experience satisfaction.

[0042] In this embodiment, one side of the curved surface connected to the volute tongue 14 of the volute is arranged close to the first wall surface 134 relative to the other side of the curved surface. In other words, the curved surface is an inclined curved surface. Figure 6 The inner guide surface 131 is two lines. If the airflow from the impeller hits the wall of the volute at the same time, a strong fan fundamental frequency noise will be generated. In this embodiment, the inner guide surface 131 is designed as an inclined curved surface, which avoids the continuous impact of the airflow from the impeller on the same cross-sectional position of the inner guide surface 131, effectively reducing the sound pressure level peak at the fundamental frequency in the fan noise spectrum, thereby reducing the total noise level of the fan.

[0043] In this embodiment, if Figure 3 and Figure 4 As shown, the inner guide surface 131 is a curved surface, and the first air outlet 13 further has a first wall surface 134 arranged opposite to the inner guide surface 131. The distance between the inner guide surface 131 and the first wall surface 134 gradually decreases from the inside to the outside, so that the airflow flows more smoothly and the resistance is smaller. Specifically, the inner guide surface 131 is a curved surface, which further makes the airflow flow smoother, the resistance is smaller, the air outlet efficiency is higher, and it is easy to process and reduces the difficulty of processing.

[0044] In this embodiment, the outer guide surface 132 is an inclined surface inclined relative to the axis of the impeller. The inclined surface can not only further reduce the continuous impact of the airflow on the guide surface when it flows out, but also facilitates processing and manufacturing, reducing costs. Specifically, the angle between the inclined surface and the axis of the impeller is in the range of 50° to 65°. Of course, the angle between the inclined surface and the axis of the impeller is not limited to this, and needs to be adjusted according to the position of the first air outlet.

[0045] In this embodiment, the width of the inner guide surface 131 gradually increases along the air outlet direction of the first air outlet 13, so as to facilitate cooperation with other wall surfaces of the first air outlet. The volute also has a second wall surface and a third wall surface that are arranged opposite to each other, and the second wall surface and the third wall surface are respectively connected to the two side edges of the guide surface, and the distance between the second wall surface and the third wall surface gradually increases along the air outlet direction, and the width of the inner guide surface 131 matches the width between the second wall surface and the third wall surface.

[0046] In this embodiment, the volute further has a volute tongue 14, and the starting point and the outer edge of the inner guide surface 131 are respectively located on the inner side and the outer side of the horizontal plane where the tangent line of the side surface of the volute tongue 14 facing the accommodating chamber 11 is located. The starting point of the inner guide surface 131 is close to the accommodating chamber 11, shortening the air outlet path. Specifically, the distance H1 between the starting point of the inner guide surface 131 and the horizontal plane is in the range of 50 mm to 60 mm. The second wall surface is connected to the outer edge of the volute tongue.

[0047] In this embodiment, the maximum distance between a point on the outer edge of the inner guide surface 131 and the horizontal plane is H2, H2=H1, and the vertical height of the inner guide surface 131 is set within a reasonable range, thereby controlling the noise within a reasonable range.

[0048] In this embodiment, the guide surface also includes a middle guide surface 133 connected between the inner guide surface 131 and the outer guide surface 132, and the middle guide surface 133 is a straight surface extending in the vertical direction. The setting of the middle guide surface 133 increases the first air outlet and can increase the air volume. Specifically, the height H3 of the middle guide surface 133 is equal to the distance H1 between the starting point of the inner guide surface 131 and the horizontal plane. The height of the middle guide surface is set within a reasonable range to avoid the situation where the height of the middle guide surface is too high and the volume of the volute is large. In addition, the inner guide surface 131, the middle guide surface 133 and the outer guide surface 132 are dislocated in the air outlet direction, so that the airflow noise at each location forms a phase difference, which reduces the noise to a certain extent.

[0049] In this embodiment, if Figure 4 and Figure 5As shown, the volute also has a guide cover 15, and the two sides of the guide cover surface of the guide cover 15 are respectively connected to the second wall surface and the third wall surface, and the inner side of the guide cover surface is connected to the outer side of the first wall surface 134. The guide cover plays a role of guiding airflow, which can make the airflow flow upward. Specifically, the guide cover surface includes a first guide cover surface 151 and a second guide cover surface 152, one side of the first guide cover surface 151 is connected to the second wall surface, the other side of the first guide cover surface 151 is connected to the one side of the second guide cover surface 152, and the other side of the second guide cover surface 152 is connected to the third wall surface, and the first guide cover surface 151 is parallel to the outer guide surface 132. The first guide cover surface 151 plays a guiding role, and the second guide cover surface 152 plays a role of transitionally connecting the first guide cover surface 151 and the third wall surface. The second guide cover surface 152 is a curved surface.

[0050] In this embodiment, the guide surface also includes a middle guide surface 133 connected between the inner guide surface 131 and the outer guide surface 132, and the innermost point on the first guide cover surface 151 and the innermost point on the middle guide surface 133 are in the same horizontal plane, or the innermost point on the first guide cover surface 151 is 10 mm to 20 mm lower than the innermost point on the middle guide surface 133.

[0051] In this embodiment, the height H4 of the first air guide surface 151 along the vertical direction is in the range of 85 mm to 95 mm, which can control the first air outlet to be at a suitable position.

[0052] In this embodiment, the air guide surface further includes a third air guide surface 153, which is connected to the outer edge of the first air guide surface 151 and the outer edge of the second air guide surface 152. The third air guide surface 153 is a straight surface extending in the vertical direction, which can further make the air flow flow upward. Specifically, the height H5 of the third air guide surface 153 in the vertical direction is within the range of 40 mm to 50 mm, which can control the first air outlet to be at a suitable position.

[0053] In this embodiment, the width between the inner guide surface 131 and the first wall surface 134 gradually decreases from the inside to the outside, the width between the middle guide surface 133 and the lower part of the first guide cover surface 151 gradually increases from the inside to the outside, the width between the lower part of the outer guide surface 132 and the upper part of the first guide cover surface 151 remains unchanged from the inside to the outside, and the width between the upper part of the outer guide surface 132 and the third guide cover surface 153 gradually decreases from the inside to the outside, that is, the width of the first air outlet duct 13 along the axial direction of the impeller decreases, increases, remains unchanged, and then decreases from the inside to the outside. In this way, the direction of the airflow has changed when the airflow flows out from the inner guide surface 131, and the outer guide surface 132 is used to guide the airflow flowing out of the inner guide surface 131 to the first air outlet 12, and almost does not change the flow direction of the airflow. In this way, the impact of the airflow on the guide surface when the airflow flows through the outer guide surface 132 is very small, so that the airflow will not continuously impact the guide surface, thereby reducing the continuous impact of the airflow on the guide surface when it flows out, reducing noise, and improving user experience satisfaction.

[0054] In this embodiment, the first wall surface 134 is a straight surface extending along the vertical direction.

[0055] In this embodiment, the first air outlet 12 is an upper air outlet. In this embodiment, the volute also has a second air outlet 16 and a second air outlet duct 17. The second air outlet 16 is connected to the circumferential part of the accommodating chamber 11 through the second air outlet duct 17. The second air outlet 16 is a lower air outlet. The second air outlet duct 17 has the same air outlet direction as a traditional centrifugal fan, that is, the airflow direction does not change after the airflow flows out of the lower air outlet. Of course, the second air outlet can also adopt the structure of the first air outlet.

[0056] In this embodiment, the volute includes a left volute and a right volute, the left volute has an air inlet and a guide surface, and the right volute has a guide cover surface and a first wall surface. Figure 5 The left side portion is the left volute and the right side portion is the right volute, which is convenient for processing and manufacturing the guide surface and the guide cover surface. As an alternative embodiment, the first air outlet is the lower air outlet and the second air outlet is the upper air outlet.

[0057] As an alternative embodiment, no air deflector is provided.

[0058] As an alternative implementation, the width of the first air outlet duct along the axial direction of the impeller first decreases and then increases from the inside to the outside. In this case, the third air guide surface is not provided and the height of the first air guide surface in the vertical direction is reduced.

[0059] As an alternative implementation, the outer guide surface is a curved surface.

[0060] The present invention also provides a centrifugal fan, comprising the above-mentioned volute and impeller, the impeller being arranged in the accommodating cavity, the air flow being sucked in by the impeller from the air inlet, thrown out from the circumference of the impeller, and then flowing along the guide surface to the other side opposite to the air inlet, thereby changing the air outlet direction of the centrifugal fan and diversifying the structure of the centrifugal fan.

[0061] By performing air volume and noise tests on the centrifugal fan of the present invention and the centrifugal fan in the prior art, the test data are shown in Table 1 below.

[0062] Table 1

[0063]

[0064] It can be seen from Table 1 that, compared with the centrifugal fan in the prior art, the air volume of the centrifugal fan of the present invention is significantly larger than that of the centrifugal fan in the prior art, and the noise of the centrifugal fan of the present invention is also significantly smaller than that of the centrifugal fan in the prior art.

[0065] The present invention also provides an air conditioner, comprising the centrifugal fan, that is, the centrifugal fan is applied to the air conditioner. Of course, the centrifugal fan can also be applied to other electrical appliances.

[0066] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0067] The guide surface of the upper air outlet duct of the volute is divided into multiple sections. The multiple guide surfaces guide the air out, which can effectively weaken the continuous impact of the airflow on the duct wall and reduce the total noise value by 1~2dB to a certain extent. It can also play a good guiding role, greatly improve the pressure distribution of the upper air outlet section, and play a role in increasing the air volume. It effectively solves the problem of reduced air volume and high noise at the air outlet of the centrifugal fan for cabinet units, and improves user experience satisfaction.

[0068] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A volute, comprising an air inlet, a receiving chamber (11), a first air outlet (12) and a first air outlet duct (13), wherein the receiving chamber (11) is used to receive an impeller, the receiving chamber (11) is in communication with the air inlet, and the first air outlet (12) is in communication with a circumferential portion of the receiving chamber (11) via the first air outlet duct (13). It is characterized in that The first air outlet duct (13) has a guide surface, the guide surface comprising an inner guide surface (131) and an outer guide surface (132) connected to each other, the inner guide surface (131) extending from the peripheral side of the accommodating cavity (11) toward the other side opposite to the air inlet, and the outer guide surface (132) extending outward relative to the connection between the inner guide surface (131) and the outer guide surface (132) to reduce the impact of the airflow on the guide surface; The first air outlet duct (13) further comprises a first wall surface (134) arranged opposite to the inner flow guide surface (131), and the volute further comprises a second wall surface and a third wall surface arranged opposite to each other, the second wall surface and the third wall surface are respectively connected to two side edges of the flow guide surface, and the second wall surface is connected to the outer edge of the volute tongue of the volute; The first air outlet (12) is an upper air outlet; The volute further comprises a second air outlet (16) and a second air outlet duct (17); the second air outlet (16) is connected to a circumferential portion of the accommodating chamber (11) via the second air outlet duct (17); the second air outlet (16) is a lower air outlet.

2. The volute according to claim 1, characterized in that: The inner flow guide surface (131) is a curved surface, and the distance between the inner flow guide surface (131) and the first wall surface (134) gradually decreases from the inside to the outside.

3. The volute according to claim 2, characterized in that: One side edge of the curved surface connected to the volute tongue (14) of the volute is arranged close to the first wall surface (134) relative to the other side edge of the curved surface, and / or the inner flow guide surface (131) is a curved surface.

4. The volute according to any one of claims 1 to 3, characterized in that: The outer flow guide surface (132) is an inclined surface inclined relative to the axis of the impeller.

5. The volute according to claim 4, characterized in that: The angle between the inclined surface and the axis of the impeller is in the range of 50° to 65°.

6. The volute according to any one of claims 1 to 3, characterized in that: The width of the inner guide surface (131) gradually increases along the air outlet direction of the first air outlet channel (13).

7. The volute according to any one of claims 1 to 3, characterized in that: The volute further comprises a volute tongue (14), wherein a starting point of the inner flow guide surface (131) and an outer edge thereof are respectively located on the inner side and the outer side of a horizontal plane where a tangent line of a side surface of the volute tongue (14) facing the accommodating chamber (11) is located.

8. The volute according to claim 7, characterized in that: The distance H1 between the starting point of the inner guide surface (131) and the horizontal plane is in the range of 50 mm to 60 mm.

9. The volute according to claim 8, characterized in that: The maximum distance between a point on the outer edge of the inner guide surface (131) and the horizontal plane is H2, where H2=H1.

10. The volute according to claim 7, characterized in that: The flow guide surface further comprises a middle flow guide surface (133) connected between the inner flow guide surface (131) and the outer flow guide surface (132), and the middle flow guide surface (133) is a straight surface extending in a vertical direction.

11. The volute according to claim 10, characterized in that: The height H3 of the middle flow guiding surface (133) is equal to the distance H1 between the starting point of the inner flow guiding surface (131) and the horizontal plane.

12. The volute according to any one of claims 1 to 3, characterized in that: The volute further comprises a deflector cover (15), the two side edges of the deflector cover surface of the deflector cover (15) are respectively connected to the second wall surface and the third wall surface, and the inner edge of the deflector cover surface is connected to the outer edge of the first wall surface (134).

13. The volute according to claim 12, characterized in that: The flow guide cover surface comprises a first flow guide cover surface (151) and a second flow guide cover surface (152); one side edge of the first flow guide cover surface (151) is connected to the second wall surface; the other side edge of the first flow guide cover surface (151) is connected to one side edge of the second flow guide cover surface (152); the other side edge of the second flow guide cover surface (152) is connected to the third wall surface; and the first flow guide cover surface (151) is parallel to the outer flow guide surface (132).

14. The volute according to claim 13, characterized in that The flow guide surface further comprises a middle flow guide surface (133) connected between the inner flow guide surface (131) and the outer flow guide surface (132); the innermost point on the first flow guide cover surface (151) and the innermost point on the middle flow guide surface (133) are in the same horizontal plane, or the innermost point on the first flow guide cover surface (151) is 10 mm to 20 mm lower than the innermost point on the middle flow guide surface (133).

15. The volute according to claim 13, characterized in that: The height H4 of the first air guide cover surface (151) along the vertical direction is in the range of 85 mm to 95 mm.

16. The volute according to claim 13, characterized in that: The deflector surface further comprises a third deflector surface (153), wherein the third deflector surface (153) is connected to the outer edge of the first deflector surface (151) and the outer edge of the second deflector surface (152), and the third deflector surface (153) is a straight surface extending in a vertical direction.

17. The volute according to claim 16, characterized in that The height H5 of the third air guide cover surface (153) along the vertical direction is in the range of 40 mm to 50 mm.

18. The volute according to any one of claims 1 to 3, characterized in that: The first wall surface (134) is a straight surface extending in a vertical direction.

19. A centrifugal fan, characterized in that: The volute comprises the volute as claimed in any one of claims 1 to 18.

20. An air conditioner, characterized in that: Including the centrifugal fan as described in claim 19.

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