WO2023103121A1

WO2023103121A1 - Volute casing, air passage assembly, and air conditioner

Info

Publication number: WO2023103121A1
Application number: PCT/CN2021/142500
Authority: WO
Inventors: 代思全; 张勇; 杨林; 迟莽
Original assignee: Tcl空调器(中山)有限公司
Priority date: 2021-12-08
Filing date: 2021-12-29
Publication date: 2023-06-15
Also published as: CN116241505A

Abstract

A volute casing structure (100), an air passage assembly (200), and an air conditioner, comprising a volute casing body (150), having a body portion (110) and an outlet portion (120), and a volute tongue (130) being formed at a connection position between the body portion (110) and the outlet portion (120); and a hedging hole (140), provided on the volute tongue (130), and being used for communicating the atmosphere with the volute casing body (150) and forming a hedging airflow at a position close to the volute tongue (130) to block the airflow in the body portion (110) from impacting the volute tongue (130). The hedging airflow can be formed by providing the hedging hole (140) and using a low-pressure area (A1) to absorb air in an external space; the hedging airflow forms a gas protection layer (P) at the volute tongue (130); the gas protection layer (P) can slow down the airflow in the body portion (110), and can reduce or prevent the direct impact of the airflow in the body portion (110) on the side surface of the volute tongue (130), thereby reducing or eliminating aerodynamic noise caused by large impact.

Description

Volute structure, air duct assembly and air conditioner

This application claims the priority of the Chinese patent application with the application number 202111491738.9 and the title of the invention "volute structure, air duct assembly and air conditioner" filed with the State Intellectual Property Office of China on December 8, 2021, the entire contents of which are incorporated by reference incorporated in this application.

technical field

The present application relates to the technical field of air conditioning, in particular to a volute structure, an air duct assembly and an air conditioner.

Background technique

The fresh air fan can input fresh outdoor air into the room and discharge the dirty air from the room to the outdoor air circulation purification equipment. In order to realize the drive of the airflow, the existing fresh air fans generally use forward centrifugal fans as power devices.

During the operation of the centrifugal fan, the gas flows out from the air outlet along the air outlet direction; however, the gas is easy to form a backflow at the air outlet near the volute tongue, and the gas of the backflow air will impact the volute tongue, and it is easy to generate a large impact noise. poor.

technical problem

The present application provides a volute structure, an air duct assembly and an air conditioner to solve the technical problem in the prior art that the backflow wind at the volute tongue causes impact noise.

technical solution

In one aspect, the present application provides a volute structure, comprising:

The volute body has a body part and an outlet part, and a volute tongue is formed at the connection between the body part and the outlet part;

The counter-punching hole is arranged on the volute tongue, and penetrates the volute body to communicate with the external space to form a pair of counter-punching airflows, which are used to block the airflow in the body part that impinges on the volute tongue.

In a possible implementation manner of the present application, the volute tongue includes an arc-shaped segment and connecting segments arranged at both ends of the arc-shaped segment, and the connecting segments at both ends of the arc-shaped segment are connected to the body part respectively. and the outlet portion, the punching hole is arranged on the arc segment.

In a possible implementation manner of the present application, microholes are provided on the connecting section, and the cross-sectional area of the microholes is not larger than the cross-sectional area of the counter-punching hole.

In a possible implementation manner of the present application, the volute structure has an installation cavity for installing the centrifugal blade, and the center line of the counter-punched hole is tangent to the upper edge of the centrifugal blade near the outlet. .

In a possible implementation manner of the present application, the counter punching hole is waist-shaped.

In a possible implementation manner of the present application, the volute structure includes a restrictor plate, and the restrictor plate is installed on a side of the counter-punching hole away from the body part.

In a possible implementation manner of the present application, a deflector is arranged in the volute body, the deflector is installed at the outlet, and the extension direction of the deflector is parallel to the wind outlet direction. .

In a possible implementation manner of the present application, the volute structure includes a guide ring, the guide ring is installed in the volute body, the guide ring includes a circular arc segment and a straight line segment, the The arc segment is connected to the straight line segment, and the straight line segment is arranged opposite to the volute tongue.

On the other hand, the present application also provides an air duct assembly, including the above-mentioned volute structure and the centrifugal fan, and the centrifugal fan is installed in the volute body.

On the other hand, the present application also provides an air conditioner, including the air duct assembly as described above.

Beneficial effect

A volute structure, an air duct assembly and an air conditioner provided by the application include a volute body having a body part and an outlet part, a volute tongue is formed at the connection between the body part and the outlet part; It is used to communicate with the atmosphere and the volute body, and forms a pair of opposing airflow near the volute tongue to block the airflow in the body part that impacts the volute tongue. After the airflow flows through the annular channel between the body and the centrifugal blades, part of the airflow enters the outlet, and the other part flows back into the annular channel; the rapid flow of these two parts forms a low-pressure area at the volute tongue. By arranging counter punch holes and using the low-pressure area to absorb the air in the external space, a counter air flow can be formed, and the counter air flow will form a gas protection layer at the volute tongue; the gas protection layer can slow down the air flow in the main body, and can reduce or prevent the air flow in the main body. The direct impact of the airflow on the side surface of the volute tongue, thereby reducing or eliminating the aerodynamic noise caused by the large impact.

Description of drawings

The technical solutions and other beneficial effects of the present application will be apparent through the detailed description of the specific embodiments of the present application below in conjunction with the accompanying drawings.

Fig. 1 is the structural representation of the volute structure provided by the embodiment of the present application;

Fig. 2 is the sectional view of the volute structure of the prior art at K in Fig. 1;

Fig. 3 is a structural schematic diagram of the casing of the volute structure part provided by the embodiment of the present application;

Fig. 4 is a cross-sectional view of the volute structure at K in Fig. 1 provided by the embodiment of the present application;

Fig. 5 is the enlarged schematic view of E place in Fig. 4;

Fig. 6 is a structural schematic view of another viewing angle of the volute structure provided by the embodiment of the present application;

Fig. 7 is the enlarged schematic diagram of place D in Fig. 6;

FIG. 8 is a schematic structural diagram of a guide ring provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an air duct assembly provided by an embodiment of the present application.

Reference signs:

Volute structure 100, body part 110, annular flow channel 111, outlet part 120, air outlet 121, upper side plate 122, lower side plate 123, volute tongue 130, arc section 131, connecting section 132, opposite punching hole 140, volute Shell body 150, deflector 170, first part 171, second part 172, deflector ring 180, arc segment 181, straight segment 182, restrictor plate 190, air duct assembly 200, filter cover 210, air outlet direction F1, low pressure area A1, high pressure area A2, gas protective layer P.

Embodiments of the present invention

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In this application, unless otherwise expressly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The following disclosure provides many different implementations or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and arrangements of specific examples are described below. Of course, they are examples only and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or reference letters in various instances, such repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

Please refer to FIG. 1 to FIG. 5 , the embodiment of the present application provides a volute structure 100, including: a volute body 150 with a body part 110 and an outlet part 120, and a volute tongue is formed at the connection between the body part 110 and the outlet part 120 130 : the counter-punching hole 140 is provided on the volute tongue 130 and penetrates the volute body 150 to communicate with the external space to form a pair of counter-punching airflow for blocking the airflow in the body part 110 impacting the volute tongue 130 .

It should be noted that the volute structure 100 is shaped like a snail shell. In the embodiment of the present application, the volute structure 100 is enclosed by two volute-shaped volute bodies 150; in addition, the volute structure 100 can also be surrounded by a plurality of side plates and other structural forms. This is not too limited.

The volute body 150 has a body portion 110 and an outlet portion 120 connected to each other. Wherein, the cross-sectional shape of the body part 110 is approximately circular, and a centrifugal fan blade (not shown in the figure) can be arranged inside it, and the airflow flows through the annular flow channel 111 between the body part 110 and the centrifugal fan blade, and then flows from the outlet part 120 discharge. The outlet portion 120 may be surrounded by four side plates including an upper side plate 122 and a lower side plate 123 . Wherein, the tangential direction of the closest edge of the centrifugal blade to the upper side plate 122 is usually the air outlet direction F1, which is usually the uppermost end of the centrifugal blade installed in the volute body 150 . The air outlet 121 is located at an end of the outlet portion 120 away from the main body portion 110 and has a rectangular shape. A volute tongue 130 is formed at the junction of the body part 110 and the outlet part 120, that is, a volute tongue 130 is formed at the junction of the lower side plate 123 and the body part 110. In order to avoid shock waves or noises generated by the airflow passing through sharp objects, the volute tongue 130 is mostly arc-shaped with smooth surface.

It should also be noted that when the centrifugal fan blade rotates, the airflow first enters the centrifugal fan blade from the external space, and is accelerated to flow out along the tangential direction at the edge of the centrifugal fan blade by the influence of centrifugal force; then enters the annular flow channel 111 and flows along it, and part of the airflow finally flows out along the outlet 120 . Another part of the airflow does not enter the outlet portion 120 because it has just entered the centrifugal blade or is affected by the volute tongue 130 and the body portion 110 , and thus enters the annular flow channel 111 . Therefore, two parts of high-speed air flow pass through both sides of the volute tongue 130 , and the high-speed air flow drives the air flow near the volute tongue 130 to flow away, thereby forming a low-pressure area A1 near the volute tongue 130 , that is, a backflow area. Part of the air entering the outlet 120 or the annular channel 111 will flow back to the return area under the suction of the low-pressure area A1, and form a return air in the return area. The return air is mostly a vortex air flow, and the return air will continue. Impact the volute tongue 130 and generate aerodynamic noise.

After the airflow flows through the annular flow channel 111 between the body part 110 and the centrifugal fan blade, part of the airflow enters the outlet part 120, and the other part of the airflow reflows into the annular flow channel 111; these two parts flow quickly at the volute tongue 130 A low pressure area A1 is formed. By setting the counter-punching hole 140 and using the low-pressure area A1 to absorb the air in the external space, a counter-airflow can be formed, and the counter-airflow will form a gas protection layer P at the volute tongue 130; the gas protection layer P can slow down the airflow in the main body 110 , can reduce or prevent the direct impact of the airflow in the body part 110 on the side surface of the volute tongue 130, thereby reducing or eliminating the aerodynamic noise caused by the large impact.

In some embodiments, the volute tongue 130 includes an arcuate segment 131 and connecting segments 132 at both ends of the arcuate segment 131, the connecting segments 132 at both ends of the arcuate segment 131 are respectively connected to the body part 110 and the outlet part 120, opposite to the punching hole 140 is disposed on the arc segment 131 .

It can be understood that the volute tongue 130 is formed at the junction of the main body portion 110 and the outlet portion 120, and the shape of the volute tongue 130 is “Λ” due to the angle between the side wall of the annular channel 111 and the lower side plate 123 glyph. In order to avoid the shock wave or noise generated by the air flow passing through the tip of the “Λ”-shaped volute tongue 130 , the tip is usually rounded, which is the arc segment 131 . Correspondingly, the two downwardly extending ends of the “Λ”-shaped volute tongue 130 are connecting sections 132 , and the two connecting sections 132 are respectively connected to the main body 110 and the outlet 120 .

It can be known from the above that the backflow air is usually formed near the volute tongue 130, and the extending direction of the arc section 131 usually corresponds to the central area of the backflow air. Therefore, the counter-punching hole 140 is provided on the arc-shaped section 131 , and the air in the external space enters into the main body 110 through the counter-punching hole 140 to form a counter-current airflow. In addition, the opposing air flow can be aimed at the central area of the return air, which can maximize the offset against the return air; that is, the gas protection layer P formed by the opposing air flow can cover the volute tongue 130 as much as possible, so as to avoid the impact of the return air on the volute tongue 130 to the greatest extent, reducing the aerodynamic noise.

It should also be noted that since the outlet 120 provided in the embodiment of the present application is trumpet-shaped, the space on the side of the outlet 120 close to the air outlet 121 will become larger, and the air flow will be easily located on the lower side plate with a larger inclination angle. 123 on reflux. Under the combined influence of the low-pressure area A1 at the volute tongue 130 , the area where the backflow air is formed may be on the volute tongue 130 near the outlet portion 120 .

Therefore, optionally, the punching hole 140 may also be provided on the connecting section 132 connecting the outlet portion 120 . The volute structure 100 of the flared outlet portion 120 can be better adapted.

Further, in some other embodiments, the counter punching hole 140 can also be provided on the connecting section 132 connecting the main body part 110, or at the connection between the arc segment 131 and the connecting segment 132, etc., only needing to meet the flow direction alignment of the counter airflow The central area of the return air is sufficient, and there is no excessive limitation here.

In some embodiments, microholes (not shown in the figure) are provided on the connecting section 132 , and the cross-sectional area of the microholes is not larger than the cross-sectional area of the counter-punching hole 140 .

It should be noted that if the counter-punching hole 140 is arranged on the arc segment 131, the thickness of the gas protection layer P formed by the counter-flow will gradually decrease on the volute tongue 130 along the direction away from the arc segment 131, so when the connecting segment 132 is away from the arc segment The far end of the shaped section 131 may have a thin gas protection layer P or no gas protection layer P, and the backflow wind may still impact the volute tongue 130 .

It should also be noted that when air flows through the micropores, tiny air columns will be formed in the micropores and the vicinity of the micropores, and the air columns can further extend to form a small-scale protective layer in the vicinity of the micropores. When the airflow such as the backflow wind hits the air column or the protective layer, it will cancel each other with the air column or the protective layer, thereby reducing the kinetic energy of the backflow wind and the wind speed of the backflow wind, thereby reducing the aerodynamic noise.

Therefore, by arranging the micropores in the connecting section 132, it is possible to avoid opening the counter-punching hole 140 with a larger aperture in the connecting section 132, thereby causing the wind pressure of the opposing airflow to decrease and weaken the thickness of the gas protective layer P, or the opposing airflow of the connecting section 132 is relatively small. It is likely to interfere with the gas flow in the outlet portion 120 and the annular channel 111 ; a thinner gas protection layer P can also be formed at the far end of the connecting section 132 away from the arc section 131 . It not only prevents the backflow wind from impacting the volute tongue 130, but also reduces the aerodynamic noise; it also reduces the influence of the protective layer formed by the opposing airflow on the airflow in the outlet part 120 and the annular flow channel 111, and improves the aerodynamic efficiency of the volute structure 100.

Preferably, a plurality of microholes can be arranged in an array on the connection section 132 disposed near the outlet portion 120 .

It can be seen from the above that the connection section 132 disposed close to the outlet portion 120 may still form backflow air. Therefore, by providing a plurality of microholes on the connecting section 132 near the outlet 120 , the impact of the backflow air on the connecting section 132 can be avoided, and the aerodynamic noise can be reduced.

Moreover, the regularly arranged multiple micropores can make the air column or the protective layer evenly and regularly arranged on the surface of the connecting section 132 , which improves the noise reduction effect of the volute tongue 130 .

Further, in some other embodiments, the microholes may also be provided on the connection section 132 provided close to the body part 110 , or microholes may be provided on both connection sections 132 , etc., which are not limited here.

Furthermore, in some other embodiments, the plurality of micropores may also be arranged randomly, which is not limited too much here.

Preferably, the micropores are circular.

The round micro-holes have a smooth surface to further reduce aerodynamic noise.

Further, in some other embodiments, the microholes may also be rectangular or elliptical, etc., which are not limited here too much.

In some embodiments, the porosity of the volute tongue 130 is B, where B satisfies: 10%≤B≤50%.

By arranging a plurality of microholes and counter-punching holes 140 , the coverage of the air column or protective layer on the volute tongue 130 can be increased as much as possible, and the aerodynamic noise formed when the backflow wind hits the volute tongue 130 can be further reduced.

Furthermore, in some other embodiments, B may also satisfy: 5%≤B<10%, or 50%<B≤60%, etc., which will not be limited too much here.

In some embodiments, the volute structure 100 has an installation cavity for installing the centrifugal fan, and the center line of the punching hole 140 is tangent to the upper edge of the centrifugal fan near the outlet portion 120 .

It can be seen from the above that, after the air enters the centrifugal blade, it will be accelerated to flow out along the tangential direction at the edge of the centrifugal blade under the influence of the centrifugal force. And because the centrifugal fan blades are mostly circular, the centrifugal fan blades will accelerate the airflow at 360 degrees in the annular flow channel 111; The tongue 130 flows, thereby increasing the air volume of the return air and aggravating the aerodynamic noise.

By setting the counter punching hole 140 such that the centerline is tangent to the upper edge, the counter punching hole 140 can be directed to the part of the airflow of the volute tongue 130 in the direction of the tangent. This part of the airflow can be better counteracted, thereby reducing the airflow entering the recirculation area, weakening the air volume and wind speed of the recirculation air, and further reducing the aerodynamic noise.

It can be understood that, the part of the airflow directed to the volute tongue 130 in the tangential direction to the punching hole 140 can better block and separate this part of the airflow. However, in the prior art, some centrifugal fan blades are arc-shaped, so the tangential direction of the airflow may be slightly deflected.

Accordingly, there is an included angle between the center line of the punching hole 140 and the line connecting the center line of the punching hole 140 and the upper edge, that is, the center line of the punching hole 140 can float slightly up and down on the upper edge, for example, -10° to 10° , the punching hole 140 can be better aligned with the airflow blowing to the volute tongue 130 , which is not limited here.

In some embodiments, the punching hole 140 is waist-shaped.

By setting the waist-shaped counter-punching hole 140, the distance between the side walls of the counter-punching hole 140 can be reduced, which facilitates the convergence of the counter-punching air; and the inner surface of the waist-shaped counter-punching hole 140 is smooth, which can reduce noise.

Further, in some other embodiments, the punching hole 140 may also be rectangular, or circular, etc., which will not be limited too much here.

In some embodiments, the cross-sectional shape of the punching hole 140 is trumpet-shaped.

It should be noted that the flow velocity will change after the air flow passes through the channels with different outlet and inlet cross-sectional areas.

The counter-punching hole 140 with a trumpet-shaped cross-section can be used to adjust the flow rate of the counter-airflow, thereby adjusting the thickness and extension range of the gas protection layer P, and improving the noise reduction effect.

Preferably, the cross-sectional area of the outlet of the punching hole 140 located in the body part 110 is smaller than the cross-sectional area of the entrance located in the external space. That is, the flow velocity of the opposing airflow can be further increased, thereby improving the counteracting effect on the return airflow and improving the noise reduction effect.

Further, in some other embodiments, the cross-sectional area of the outlet of the punching hole 140 located in the body portion 110 may also be greater than the cross-sectional area of the entrance located in the external space, which is not limited here.

In some embodiments, the volute structure 100 includes a plurality of counter-punching holes 140 arranged at intervals.

A plurality of spaced opposing holes 140 can make a larger opposing airflow into multiple smaller opposing airflows, so that the distribution of the gas protection layer P is more uniform.

Please refer to FIG. 4 to FIG. 7 , in some embodiments, the volute structure 100 includes a restrictor plate 190 , and the restrictor plate 190 is mounted on a side of the punching hole 140 away from the body portion 110 .

It should be noted that the gas flow field in the outer space is relatively complex. The airflows of different flow directions are easy to enter into the body part 110 through the punching hole 140 at the same time, and the airflows in each flow direction impact and offset each other, which not only reduces the airflow volume of the counterflow airflow, but also weakens the hedging effect on the return airflow; it may also interfere with the outlet part 120 and the annular The airflow in the flow channel 111 causes local airflow turbulence, which reduces the aerodynamic efficiency of the volute structure 100 .

Therefore, by installing the restrictor plate 190 on the side of the punching hole 140 away from the body portion 110 , that is, the restrictor plate 190 is installed in the external space. The airflow in a specific direction can be blocked from entering the body part 110 through the counter-punching hole 140 , so that the airflow can enter the counter-punching hole 140 along one or more defined directions, thereby improving the airflow quality of the counter-airflow.

Preferably, the embodiment of the present application includes two restrictor plates 190 , which together with the volute body 150 form a cavity with an opening in only one direction. The counter-punching hole 140 can suck air through the cavity, and the airflow can enter the body part 110 along a defined path, which improves the airflow quality of the counter-punching airflow.

In some embodiments, a deflector 170 is disposed inside the volute body 150 , and the deflector 170 is installed at the outlet portion 120 , and the extension direction of the deflector 170 is parallel to the wind outlet direction F1 .

It should be noted that, due to the influence of factors such as the outlet part 120 being generally trumpet-shaped and part of the gas entering the annular flow channel 111, a high-pressure area A2 will be formed in the outlet part 120 and above the volute tongue 130. In the high-pressure area A2 Part of the airflow will flow back to the low-pressure area A1 near the volute tongue 130, which intensifies the formation of the backflow wind and increases the aerodynamic noise.

It should also be noted that the deflector 170 is installed above the centrifugal blades.

By arranging the deflector 170 to at least partially isolate the air flow in the high-pressure area A2, the distribution of the flow field in the vicinity of the volute tongue 130 and the outlet portion 120 is changed. Part of the airflow in the high-pressure zone A2 is not affected by the low-pressure zone A1 and directly flows out from the outlet 120, which can reduce the flow of air entering the low-pressure zone A1, thereby weakening the flow rate of the return air and reducing aerodynamic noise.

Specifically, both sides of the deflector 170 abut against the volute body 150 .

As above, the gap between the deflector 170 and the housing body can be reduced, thereby reducing the aerodynamic noise. The principle is the same or similar to that described above, and will not be elaborated here.

Further, in some other embodiments, the extending direction of the deflector 170 may also have an included angle with the wind outlet direction F1, for example, 5°, or 10°, etc., which will not be limited too much here.

In some embodiments, the deflector 170 includes a first part 171 and a second part 172, the first part 171 is located at the end of the second part 172 away from the air outlet 121, and the extension directions of the first part 171 and the second part 172 are different. .

It should be noted that the first part 171 can be arranged in the annular flow channel 111, and the second part 172 can be arranged in the outlet part 120; since the annular flow channel 111 is circular, the circular airflow in the annular flow channel 111 flows in the same direction as The direction of the linear airflow in the outlet portion 120 is different.

By setting the first part 171 to guide and disperse the air flow in the annular flow channel 111, and by setting the second part 172 to guide and disperse the air flow in the outlet part 120; the air flow entering the low-pressure area A1 can be further reduced, thereby weakening the The flow rate of the return air reduces the aerodynamic noise.

Specifically, both the first part 171 and the second part 172 are straight plate bodies, and the angle between the extension directions of the first part 171 and the second part 172 ranges from 10° to 30°, and the first part 171 faces Extending in the direction close to the centrifugal fan blades.

Further, in some other embodiments, the first part 171 can also be an arc-shaped plate body, whose shape is adapted to the annular flow channel 111; it can reduce the resistance of the first part 171 to the airflow in the annular flow channel 111, and reduce the Aerodynamic noise is not limited too much here.

Further, in some other embodiments, the angle range between the extension directions of the first portion 171 and the second portion 172 may also be 5° to 10°, or 30° to 45°, etc., and no excessive limitation is made here. .

Please refer to FIG. 4, FIG. 5, and FIG. 8. In some embodiments, the volute structure 100 includes a guide ring 180, and the guide ring 180 is installed in the volute body 150. The guide ring 180 includes an arc segment 181 and a straight line. segment 182 , the arc segment 181 connects to the straight segment 182 , and the straight segment 182 is arranged opposite to the volute tongue 130 .

It can be understood that the cross-sectional shape of the guide ring 180 is a combination of a circular arc and a straight line, and the distance from each point on the straight line to the center of the circle is smaller than the radius of the circular arc; 111 is generally a regular circle, so the distance between the volute tongue 130 and the straight line segment 182 is greater than the width of the annular flow channel 111 . Correspondingly, the airflow near the volute tongue 130 in the annular flow channel 111 has more space to flow, and the airflow can flow closer to the straight line section 182 here; thereby reducing the airflow entering the low-pressure area A1 and weakening the return air , reducing aerodynamic noise.

Please refer to FIG. 9 , the present application also provides an air duct assembly 200 , including the above-mentioned volute structure 100 and centrifugal fan blades installed in the volute body 150 . Since the air duct assembly 200 has the above-mentioned volute structure 100 , it has all the same beneficial effects, and the present application will not repeat them here.

In addition, the type of the air duct assembly 200 may be determined according to actual needs, and may be an indoor air duct assembly, a fresh air duct assembly, etc., which is not limited in this embodiment of the present application.

In some embodiments, the air duct assembly 200 may further include a filter housing 210 . The filter cover 210 is installed on the volute structure 100, the air enters the volute body 150 through the filter cover 210, and the filter cover 210 can filter the air to improve the air quality.

The present application also provides an air conditioner (not shown in the figure), including the air duct assembly 200 as described above. Since the air conditioner has the above-mentioned air duct assembly 200 , it has all the same beneficial effects, and the present application will not repeat them here.

In addition, the type of the air conditioner may be determined according to actual needs, such as a cabinet type air conditioner or a wall type air conditioner, which is not limited in this embodiment of the present application.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

The volute structure 100, the air duct assembly 200 and the air conditioner provided by the embodiment of the present application have been described above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present application. The description of the above embodiments It is only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; However, these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

A volute structure comprising:

The volute body has a body part and an outlet part, and a volute tongue is formed at the connection between the body part and the outlet part;

The counter-punching hole is arranged on the volute tongue, and penetrates the volute body to communicate with the external space to form a pair of counter-punching airflows, which are used to block the airflow in the body part that impinges on the volute tongue.
The volute structure according to claim 1, wherein the volute tongue comprises an arc segment and connecting segments arranged at both ends of the arc segment, and the connecting segments at both ends of the arc segment respectively connect the The body part and the outlet part, the pair of punching holes are arranged on the arc segment.
The volute structure according to claim 1, comprising an installation cavity for installing a centrifugal blade, the center line of the counter-punched hole is tangent to the upper edge of the centrifugal blade near the outlet.
The volute structure according to claim 1, wherein the counter punching hole is waist-shaped.
The volute structure according to claim 1, wherein the cross-sectional shape of the counter-punched holes is trumpet-shaped.
The volute structure according to claim 1, comprising a plurality of said counter-punching holes arranged at intervals.
The volute structure according to claim 2, wherein micro-holes are provided on the connecting section, and the cross-sectional area of the micro-holes is not larger than the cross-sectional area of the counter-punching hole.
The volute structure according to claim 7, wherein a plurality of said microholes are arranged in an array on said connecting section near said outlet.
The volute structure according to claim 7, wherein the microholes are circular.
The volute structure according to claim 1, wherein the porosity on the volute tongue is B, wherein B satisfies: 10%≤B≤50%.
The volute structure according to claim 1, wherein the volute structure comprises a restrictor plate, and the restrictor plate is installed on a side of the counter-punching hole away from the body part.
The volute structure according to claim 1, wherein a deflector is arranged in the volute body, the deflector is installed at the outlet, and the extension direction of the deflector is parallel to the wind outlet direction .
The volute structure according to claim 1, which comprises a guide ring, the guide ring is installed in the volute body, the guide ring includes a circular arc segment and a straight line segment, and the circular arc segment connects The straight line segment is arranged relative to the volute tongue.
The volute structure according to claim 2, which comprises a guide ring installed in the volute body, the guide ring includes a circular arc segment and a straight line segment, and the circular arc segment connects The straight line segment is arranged relative to the volute tongue.
The volute structure according to claim 3, which comprises a guide ring, the guide ring is installed in the volute body, the guide ring includes a circular arc segment and a straight line segment, and the circular arc segment connects The straight line segment is arranged relative to the volute tongue.
The volute structure according to claim 7, which comprises a guide ring installed in the volute body, the guide ring includes a circular arc segment and a straight line segment, and the circular arc segment connects The straight line segment is arranged relative to the volute tongue.
The volute structure according to claim 10, which comprises a guide ring, the guide ring is installed in the volute body, the guide ring includes a circular arc segment and a straight line segment, and the circular arc segment connects The straight line segment is arranged relative to the volute tongue.
The volute structure according to claim 11, which comprises a guide ring, the guide ring is installed in the volute body, the guide ring includes an arc segment and a straight line segment, and the arc segment connects The straight line segment is arranged relative to the volute tongue.
An air duct assembly, comprising the volute structure according to claim 1 and the centrifugal fan, the centrifugal fan is installed in the volute body.
An air conditioner, comprising the air duct assembly according to claim 19.