WO2023024223A1 - Air conditioner and cross-flow fan thereof - Google Patents

Abstract

An air conditioner and a cross-flow fan thereof. The cross-flow fan comprises a volute (1) internally provided with an air supply duct (5), and a cross-flow fan wheel (6) arranged in the air supply duct (5), wherein the cross-flow fan wheel (6) divides the air supply duct (5) into an air inlet duct (52) located upstream of the cross-flow fan wheel (6) and an air outlet duct (51) located downstream of the cross-flow fan wheel (6), and a flow guide portion (31) is arranged on a side wall of the air outlet duct (51) that is close to an end portion of the cross-flow fan wheel (6). The technical scheme aims to solve the technical problems in an existing cross-flow fan that the air supply efficiency is reduced and abnormal surge sound is generated due to the fact that an airflow flows back to two ends.

Description

Air conditioner and its cross-flow fan

cross reference

This patent application requires that the application date is August 26, 2021, the application number is 202110988654.X, and the Chinese patent application titled "air conditioner and its cross-flow fan" is August 26, 2021, and the application number is 202122029133 .X. The priority of the Chinese patent application titled "Air Conditioner and Its Cross-flow Fan", the disclosures of the above two Chinese patent applications are hereby incorporated by reference in their entirety.

technical field

The invention relates to the field of electrical equipment, in particular to an air conditioner and a cross-flow fan thereof.

Background technique

In related technologies, the air conditioner usually uses a cross-flow fan for air supply. As shown in Figures 1 and 2, the cross-flow fan includes a cross-flow fan wheel 2a and a volute 1a. The cross-flow wind wheel 2a is arranged in the volute 1a. When the opening of the air outlet of the volute 1a is small, the airflow output from the middle of the cross-flow impeller 2a will flow back to both ends of the cross-flow impeller 2a, resulting in a decrease in air supply efficiency and a surge noise.

Summary of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

The main purpose of the embodiment of the present application is to provide a cross-flow fan, aiming to solve the technical problems of the cross-flow fan that the air supply efficiency is reduced and the surge noise is generated due to the backflow of air to both ends of the cross-flow fan.

In order to achieve the above purpose, a cross-flow fan proposed in the embodiment of the present application includes a volute with an air supply duct inside and a cross-flow fan wheel arranged in the air supply duct;

Wherein, the cross-flow wind wheel divides the air supply duct into an air inlet duct located upstream of the cross-flow wind rotor and an air outlet duct located downstream of the cross-flow wind rotor, and the air outlet duct is close to the A guide part is arranged on the side wall of the end part of the cross-flow wind wheel.

In an exemplary embodiment, the volute includes a shroud, two side plates covering both sides of the shroud, and a volute arranged between the two side plates and connected to the two side plates on both sides. tongue;

The two side plates, the coaming plate and the volute tongue enclose the air supply duct, the axial direction of the cross-flow fan wheel is perpendicular to the side plates, and the guide part is arranged on the The side plate faces inwardly and is located at an end of the air outlet channel close to the cross-flow rotor.

In an exemplary embodiment, the guide part is configured as a boss, and a constriction is provided on the air outlet duct, and the distance between the shroud and the volute tongue at the constriction is minimum;

The air guide part at least covers the area of the side plate in the air outlet duct from the constriction to the cross-flow fan wheel.

In an exemplary embodiment, the air guide part covers all areas of the side panel in the air outlet duct.

In an exemplary embodiment, the guide part is a platform, and the height of the guide part is 3-6 mm.

In an exemplary embodiment, the volute includes an air outlet arranged at the end of the air outlet channel away from the cross-flow fan wheel;

Along the air outlet duct, in the direction from the air outlet to the cross-flow rotor or in the direction from the cross-flow rotor to the air outlet, the height of the guide portion gradually increases.

In an exemplary embodiment, at the constriction, the height of the guide part is 3-6mm.

In an exemplary embodiment, each of the side plates is provided with a plurality of the guide parts, and the guide parts are configured as guide vanes protruding from the side plates;

The cross-section of the guide part includes a windward front end and a leeward end, and the angle between the extension direction of the cross-section at the end of the end and the air flow direction at the end is an obtuse angle or a flat angle;

A plurality of guide parts are arranged at intervals in sequence from the volute tongue to the coaming plate.

In an exemplary embodiment, the included angle ranges from 135° to 180°.

In an exemplary embodiment, the height of the guide part ranges from 3 to 6 mm.

In an exemplary embodiment, the projections of the plurality of guide parts on the first direction are sequentially connected end to end, and the air outlet direction of the cross-flow fan and the axial direction of the cross-flow fan wheel are both perpendicular to the first direction.

In an exemplary embodiment, a constriction is provided on the air outlet duct, and the distance between the shroud and the volute tongue is the smallest at the constriction;

The guide part is distributed in the area between the side plate in the air outlet duct from the constriction to the cross-flow fan wheel.

In an exemplary embodiment, the flow guide part is configured as a rib, and the flow guide part extends from the shroud to the volute tongue.

In an exemplary embodiment, a constriction is provided on the air outlet duct, and the distance between the shroud and the volute tongue is the smallest at the constriction;

The flow guiding part is arranged at the constriction.

In an exemplary embodiment, the air guide part is configured as a column protruding from the side plate, and there are a plurality of the air guide parts.

In an exemplary embodiment, a constriction is provided on the air outlet duct, and the distance between the shroud and the volute tongue is the smallest at the constriction;

A plurality of the guide parts are distributed in the area of the side plate in the air outlet channel from the constriction to the cross-flow fan wheel.

In an exemplary embodiment, a plurality of the air guides are arranged in multiple rows, and in each row of the air guides, the plurality of air guides are arranged along a direction perpendicular to the flow direction of the airflow;

The multiple rows of air guides are arranged sequentially along the direction of air flow, and the height of the air guides in the single row of air guides increases along the direction of the air flow, and the height of the air guides in the single row of air guides increase in number.

The embodiment of the present application also provides an air conditioner, which includes the above-mentioned cross-flow fan.

In the embodiment of the present application, the air outlet duct is provided with a guide part at the end close to the cross-flow wind rotor, and the guide part can increase the air pressure near the end of the cross-flow air duct and/or guide the end of the air outlet duct close to the cross-flow rotor The flow direction of the airflow, thereby weakening or even eliminating the phenomenon that the airflow in the air outlet channel flows back through the gap between the end face of the cross-flow impeller and the volute, thereby improving the air supply efficiency of the cross-flow impeller and reducing the abnormal sound of surge.

Other aspects will be apparent to others upon reading and understanding the drawings and detailed description.

Figure overview

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative effort.

Fig. 1 is the schematic diagram of the return air of cross-flow fan in the prior art;

Fig. 2 is the local schematic diagram of the return air of the cross-flow fan in the prior art;

FIG. 3 is a schematic cross-sectional view of the air conditioner according to Embodiment 1 of the present application;

Fig. 4 is a partial three-dimensional schematic diagram of the volute of Embodiment 1 of the present application;

Fig. 5 is a partial schematic diagram of the air conditioner in Embodiment 1 of the present application;

FIG. 6 is a schematic cross-sectional view of the air conditioner according to Embodiment 1 of the present application;

Fig. 7 is a schematic cross-sectional view of the distribution area of the air-conditioning display guide part in Embodiment 1 of the present application;

Fig. 8 is a schematic cross-sectional view showing the distribution area of the air guide part of the air conditioner according to an embodiment of the present application;

Fig. 9 is a partial schematic diagram of the air conditioner in Embodiment 2 of the present application;

Fig. 10 is a schematic cross-sectional view of the air conditioner in Embodiment 2 of the present application;

Fig. 11 is a schematic diagram of the air supply state of the air conditioner in Embodiment 2 of the present application when the air outlet resistance is small;

Fig. 12 is a schematic diagram of the air supply state of the air conditioner in Embodiment 2 of the present application when the air outlet resistance is relatively large;

Fig. 13 is a partial schematic diagram of the side panel of Embodiment 3 of the present application;

Fig. 14 is a partial schematic diagram of a side panel of Embodiment 4 of the present application;

Fig. 15 is a partial schematic diagram of the side panel of Embodiment 5 of the present application.

Explanation of reference numbers:

1a, volute; 2a, cross-flow wind wheel; 1, volute; 2, coaming plate; 21, second contraction plate; 22, second diffuser plate; 3, side plate; 31, guide part; 31a, guide 311a, front end; 312a, end; 31b, guide part; 31c, guide part; 31d, guide part; 4, volute tongue; 41, first contraction plate; 42, first diffuser plate; Wind duct; 51, air outlet duct; 511, contraction section; 512, expansion section; 513, shrinkage; 52, air inlet duct; 53, air outlet; 54, air inlet; 6, cross-flow wind wheel; 7. Wind deflector; 8. Heat exchanger; 9. Electric heater.

The realization of the purpose, functional features and advantages of the embodiments of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detail

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative work, all belong to the scope of protection of this application.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relationship between the components in a certain posture (as shown in the drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the embodiments of the present application, the descriptions involving "first", "second", etc. are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features . Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the embodiments of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this embodiment of the application, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

In addition, the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by this application.

Embodiment one

As shown in Figure 3, Figure 3 shows the air conditioner in Embodiment 1. The air conditioner includes a heat exchanger 8 , a cross-flow fan and an air deflector 7 . The cross-flow fan includes a volute 1 and a cross-flow fan wheel 6 . The volute 1 is provided with an air inlet 54 and an air outlet 53, and the volute 1 is provided with an air supply duct 5, the air inlet 54 is located at one end of the air supply duct 5, and the air outlet 53 is located at the other end of the air supply duct 5 . Both the heat exchanger 8 and the cross-flow wind wheel 6 are arranged in the air supply duct 5 of the volute 1 . The air conditioner may be an integral air conditioner, and the cross-flow fan is located on the indoor side of the integral air conditioner.

In this embodiment, as shown in FIGS. 3 and 4 , the volute 1 includes a shroud 2 , a volute tongue 4 and two side plates 3 . The side plates 3 can be configured as a roughly flat plate structure, and the two side plates 3 are parallel to each other. The shroud 2 and the volute tongue 4 are arranged between two side plates 3 . The shroud 2 is configured as a bent plate. Two side panels 3 are respectively connected to opposite sides of the shroud 2 . The volute tongue 4 can be a plate-shaped structure, and the volute tongue 4 is arranged on the inner side of the shroud 2 . The opposite sides of the volute tongue 4 are connected with two side plates 3 respectively. The board surfaces of the coaming plate 2 and the volute tongue 4 are all perpendicular to the side plate 3 . The coaming plate 2, the volute tongue 4 and two side plates 3 enclose the air supply duct 5.

The cross-flow wind wheel 6 is arranged in the air supply duct 5 of the volute 1 . The axis of the cross-flow wind wheel 6 is perpendicular to the two side plates 3, and the cross-flow wind wheel 6 can rotate around its own axis. The inward surface of the side plate 3 is the inner surface of the air outlet duct 51 , and a gap is formed between the side plate 3 and the end surface of the cross-flow fan wheel 6 . The shroud 2 and the volute tongue 4 surround the cross-flow wind wheel 6 halfway around the circumference of the cross-flow wind wheel 6 . The cross-flow wind wheel 6 can drive the airflow to flow along the air supply duct 5 , and the airflow enters the air supply duct 5 from the air inlet 54 , and is discharged from the air outlet 53 after passing through the air supply duct 5 . The cross-flow wind wheel 6 divides the air supply air duct 5 into an air inlet air duct 52 and an air outlet air duct 51 . The air inlet duct 52 is located upstream of the cross-flow fan 6 , and the air outlet duct 51 is located downstream of the cross-flow fan. The air inlet 54 is located at the end of the air inlet duct 52 away from the cross-flow rotor 6 , and the air outlet 53 is located at the end of the outlet duct 51 away from the cross-flow rotor 6 . In this embodiment, the air inlet duct 52 and the air outlet duct 51 are respectively located on two sides of the volute tongue 4 .

The heat exchanger 8 is arranged in the air intake duct 52 . The airflow exchanges heat with the heat exchanger 8 when passing through the heat exchanger 8, so that the heat exchanger 8 can heat or cool down the airflow. The air deflector 7 is arranged at the air outlet 53 , and the angle of the air outlet and the opening of the air outlet 53 can be adjusted by rotating the air deflector 7 .

A flow guiding portion 31 is disposed on the side plate 3 . The guide part 31 is set to reduce the width of the air outlet duct 51 in the axial direction of the cross-flow rotor 6 or guide the airflow to flow downstream of the outlet duct 51 to prevent the airflow in the outlet duct 51 from flowing toward the cross-flow rotor 6. reflow. The flow guide 31 can be configured as a boss. The air guide part 31 is located on the side of the side plate 3 facing the cross-flow fan 6 , and the air guide part 31 protrudes into the air outlet duct 51 . The guide part 31 is located downstream of the cross-flow rotor 6 , and the guide part 31 is also close to the cross-flow rotor 6 .

When the air deflector 7 is rotated to a position where the opening of the air outlet 53 is small, when the guide part 31 is not provided, the end of the cross-flow wind wheel 6 is prone to abnormal surge sound. It is found through research that due to A gap must be set between the end face of the cross-flow wind wheel 6 and the inner surface of the air outlet duct 51. This gap can prevent the end face of the cross-flow wind wheel 6 from rubbing against the inner surface of the air outlet duct 51. The width of the gap is usually 4 mm. Above, because the air pressure on the side of the air outlet duct 51 of the cross-flow wind wheel 6 is positive pressure, and the air pressure on the side of the air inlet air duct 52 of the cross-flow shunt is negative pressure, the air pressure of the cross-flow wind wheel 6 on the side of the air outlet air duct 51 is negative pressure. The air pressure on one side is greater than the air pressure on the air inlet duct 52 side of the cross-flow split flow. When the opening of the air outlet 53 is small, the airflow will follow the gap between the end surface of the cross-flow fan wheel 6 and the inner surface of the air outlet duct 51. The backflow to the side of the air inlet duct 52 will cause the efficiency of the cross-flow wind wheel 6 to decrease, and generate abnormal surge noise.

In the technical solution of this embodiment, as shown in Figure 4, the air supply duct 5 is surrounded by a shroud 2, a volute tongue 4 and two side plates 3, and the guide part 31 is arranged on the side plate 3 towards On the inner board surface, the side plate 3 is provided with a deflector 31, and the deflector 31 is close to the end of the cross-flow fan wheel 6, as shown in Figure 5, so that the air outlet duct 51 can be positioned at the deflector. The width at 31 along the axial direction of the cross-flow rotor 6 decreases, which is smaller than the width of the air inlet duct 52 along the axial direction of the cross-flow rotor 6, so that under the extrusion of the air flow, the cross-flow rotor The air pressure near the end of 6 increases, which can weaken or even eliminate the phenomenon that the airflow in the air outlet duct 51 flows back through the gap between the end surface of the cross-flow wind wheel 6 and the side plate 3, thereby improving the efficiency of the cross-flow wind wheel 6. Reduce surge noise.

In an exemplary embodiment, the air guide part 31 is a platform, the top surface of the air guide part 31 is parallel to the board surface of the side plate 3 , and the height H of the air guide part 31 may be 3-6 mm. The height of the air guiding portion 31 is the distance from the end of the air guiding portion 31 close to the side plate 3 to the end of the air guiding portion 31 facing away from the side plate 3 .

When the height of the air guide part 31 is greater than 6 mm, the air guide part 31 will significantly increase the wind resistance in the outlet air duct 51 , thereby affecting the air flow in the air supply air duct 5 . When the height of the flow guide part 31 is less than 3 mm, the anti-backflow effect of the flow guide part 31 is not particularly obvious.

In an exemplary embodiment, as shown in FIG. 6 , the volute tongue 4 includes a first contraction plate 41 and a first diffuser plate 42 . One end of the first contraction plate 41 is connected to one end of the first diffuser plate 42 . There is an included angle between the first shrinking plate 41 and the first diffusing plate 42, and the included angle may be an acute angle.

The shroud 2 includes a second contraction plate 21 and a second diffuser plate 22 . The second contraction plate 21 may be a curved plate, and the second contraction plate 21 may extend along an involute. The second diffuser plate 22 may be a flat plate. One end of the second contraction plate 21 is connected to the second diffuser plate 22 . There may be a smooth transition connection between the second contraction plate 21 and the second diffuser plate 22 .

Both ends of the first contraction plate 41 are respectively aligned with two ends of the second contraction plate 21 . The first contraction board 41 , the second contraction board 21 and the two side boards 3 enclose the contraction section 511 of the air outlet duct 51 . The first diffuser plate 42 and the second diffuser plate 22 are located on the same side of the constricted section 511 , and the first diffuser plate 42 , the second diffuser plate 22 and the two side plates 3 enclose the diffuser section 512 of the air outlet duct 51 . The distance between the first shrinkage plate 41 and the second shrinkage plate 21 tends to decrease in the direction close to the diffuser section 512 , and the distance between the first diffuser plate 42 and the second diffuser plate 22 tends to decrease in the direction close to the shrinkage section 511 has a decreasing trend. The portion of the air outlet duct 51 between the connection of the first contraction plate 41 and the first diffuser plate 42 to the joint of the second contraction plate 21 and the second diffuser plate 22 is the constriction 513 of the air outlet duct 51 . The constriction 513 is the place where the distance between the shroud 2 and the volute tongue 4 is the smallest.

The air outlet duct 51 includes the above-mentioned constriction section 511 and the above-mentioned diffuser section 512 . One end of the contraction section 511 is connected to one end of the diffuser section 512 . The cross-flow rotor 6 is arranged at the end of the constriction section 511 away from the diffuser section 512 . In the direction from the end of the constricted section 511 away from the diffuser section 512 to the end of the constricted section 511 close to the diffuser section 512, the cross-sectional area of the constricted section 511 tends to decrease. In the direction from the end of the diffuser section 512 away from the constricted section 511 to the end of the diffuser section 512 close to the constricted section 511 , the cross-sectional area of the diffuser section 512 tends to decrease. The air outlet duct 51 forms a constriction 513 at the junction of the constriction section 511 and the diffuser section 512 , and the constriction 513 is the minimum cross-sectional area of the air outlet duct 51 .

As shown in FIG. 7 , the guide part 31 covers at least the area between the side plate 3 in the air outlet duct 51 from the constriction 513 to the cross-flow fan 6 , that is, the guide part 31 covers the side plate 3 in the constricted section 511 Area. When the air guide part 31 covers at least this area, it can prevent the airflow in the air outlet duct 51 from passing through the gap between the end face of the through-flow fan wheel 6 and the side plate 3 of the air outlet duct 51, and further improve the overall flow rate. Streamline the efficiency of the wind wheel 6 and eliminate the abnormal sound of surge.

In an exemplary embodiment, as shown in FIG. 8 , the air guide part 31 covers the area between the air outlet 53 and the cross-flow fan wheel 6 of the side plate 3 in the air outlet duct 51, that is, the air guide part 31 covers the side All areas of the plate 3 in the air outlet duct 51 .

When the guide part 31 covers this area, the area between the side plate 3 from the air outlet 53 to the cross-flow fan 6 is covered with the guide part 31 , and the wall surface of the air outlet duct 51 of this section is continuous, and the appearance is beautiful. At the same time, this area includes the area between the side plate 3 in the air outlet duct 51 from the constriction 513 to the cross-flow fan wheel 6, so that the backflow phenomenon and the abnormal sound of surge can be eliminated.

In an exemplary embodiment, the height of the air guide part 31 gradually changes, and along the direction of the air outlet duct 51 from the air outlet 53 to the cross-flow fan wheel 6, the height of the air guide part 31 gradually increases. At the constriction 513, the height of the flow guide part 31 is 3-6mm. The height of the air guiding portion 31 is the distance from the end of the air guiding portion 31 close to the side plate 3 to the end of the air guiding portion 31 facing away from the side plate 3 .

The height of the guide part 31 near the air outlet 53 is smaller than the height of the guide part 31 near the side of the cross-flow fan 6, so that the resistance of the guide part 31 to the airflow can be reduced and the air volume can be increased. At the same time, the height of the part of the flow guide part 31 located at the constriction 513 is 3-6 mm, and the flow guide part 31 has an obvious effect of preventing backflow.

Therefore, this design can minimize the obstruction to the airflow while maintaining a good anti-backflow effect.

In an exemplary embodiment, the air conditioner further includes an electric heater 9 . The electric heater 9 may be a PTC electric heater. The electric heater 9 is arranged in the air inlet duct 52 , and the electric heater 9 is located downstream of the heat exchanger 8 . The electric heater 9 can convert electric energy into heat energy after being powered on. When the air conditioner is in the heating mode, the electric heater 9 can assist in heating the airflow.

Embodiment two

The difference between the cross-flow fan of Embodiment 2 and the cross-flow fan of Embodiment 1 is only that the structure of the flow guide part of the cross-flow fan of Embodiment 2 is different. In order to avoid repetition, only the differences between the two are introduced below.

As shown in FIGS. 9 and 10 , the guide portion 31 a is configured as a guide vane. The air guiding portion 31 a protrudes from the inward surface of the side plate 3 . Each side plate 3 is provided with a plurality of guide parts 31 a, and the plurality of guide parts 31 a are located in the constricted section 511 of the air outlet duct 51 . The number of guide parts 31 a on the guide part 31 may be three.

The cross-section of the flow guide 31 a is configured as an airfoil-shaped cross-section. The cross section of the air guiding part 31a includes a front end 311a and a terminal end 312a, the front end 311a is the windward side of the air guiding part 31a, and the rear end is the leeward side of the air guiding part 31a. The front end 311a is round and the end 312a is sharp. At the end of the end 312a, there is an included angle α between the extension direction of the cross section of the flow guiding portion 31a and the flow direction of the airflow at the position of the end, and the included angle α is an obtuse angle or a flat angle. A plurality of flow guiding parts 31 a are arranged at intervals in sequence from the volute tongue 4 to the shroud 2 . A wind passage gap is formed between two adjacent flow guiding parts 31a. The projections of the plurality of air guiding parts 31 a on the first direction are sequentially connected end to end, wherein the first direction is not only perpendicular to the air outlet direction of the air outlet 53 , but also perpendicular to the axial direction of the cross-flow fan wheel 6 .

As shown in Figure 11, when the opening of the air outlet 53 is large, the wind resistance at the air outlet 53 is small, the air volume output by the cross-flow wind wheel 6 is large, and there is no risk of backflow, and part of the air flow can pass through the air guide vanes. The wind gap passes. As shown in Figure 12, when the opening of the air outlet 53 is small, the air resistance of the air outlet 53 is large, the air volume output by the cross-flow wind wheel 6 is small, and the pressure on both sides of the end of the cross-flow wind wheel 6 drops. When the airflow in 51 flows back toward the end of the cross-flow impeller 6, the airflow will be blocked by the guide part 31a and cannot continue to flow back, thereby avoiding the occurrence of surge.

In an exemplary embodiment, the angle α between the extension direction of the cross-section of the air guide portion 31 a and the airflow direction at the position of the end portion ranges from 135° to 180°.

When the included angle α is within this value range, it has the best effect of blocking backflow, and surge is difficult to occur.

In an exemplary embodiment, at the end of the end 312a, the height of the flow guide part 31a ranges from 3mm to 6mm. The height of the air guide part 31 a is the distance from the end of the air guide part 31 a close to the side plate 3 to the end of the air guide part 31 a away from the side plate 3 .

When the height of the air guide part 31 a is greater than 6 mm, the air guide part 31 a will significantly increase the wind resistance in the outlet air duct 51 , thereby affecting the air flow in the air supply air duct 5 . When the height of the flow guide part 31a is less than 3 mm, the anti-backflow effect of the flow guide part 31a is not particularly obvious.

Embodiment Three

The difference between the cross-flow fan of Embodiment 3 and the cross-flow fan of Embodiment 1 is only that the structure of the flow guide part of the cross-flow fan of Embodiment 3 is different. In order to avoid repetition, only the differences between the two are introduced below.

As shown in FIG. 13 , a flow guiding portion 31 b is provided on the side plate 3 , and the flow guiding portion 31 b is configured as a boss. The air guide portion 31b is located on the side of the side plate 3 facing the cross-flow fan 6 , and the air guide portion 31b protrudes into the air outlet duct 51 . The flow guide part 31 b is located downstream of the cross-flow rotor 6 , and the flow guide part 31 b is also close to the cross-flow rotor 6 . The guide part 31 b covers at least the area of the side plate 3 in the air outlet duct 51 from the constriction 513 to the cross-flow impeller 6 , that is, the guide part 31 b covers the part of the side plate 3 in the constricted section 511 .

The height of the air guide portion 31b gradually changes, and along the direction of the air outlet duct 51 from the cross-flow fan 6 to the air outlet 53 , that is, in the direction of air flow, the height of the air guide portion 31b gradually increases. At the constriction 513, the height of the flow guide part 31b is 3-6 mm. The height of the air guiding portion 31b is the distance from the end of the air guiding portion 31b close to the side plate 3 to the end of the air guiding portion 31b facing away from the side plate 3 .

The guide part 31b is provided on the side plate 3 so that the width of the air outlet duct 51 along the axial direction of the cross-flow rotor 6 at the guide part 31b is reduced, and the width is smaller than that of the air inlet duct 52 along the axial direction of the cross-flow rotor 6. In this way, under the extrusion of the air flow, the air pressure near the end of the cross-flow wind wheel 6 rises, which can weaken or even eliminate the airflow in the air outlet duct 51 passing through the end surface of the cross-flow wind wheel 6 and The phenomenon of backflow in the gap between the side plates 3 improves the efficiency of the cross-flow wind wheel 6 and reduces the abnormal sound of surge. The height of the guide part 31b near the cross-flow rotor 6 is smaller than the height of the guide part 31b near the air outlet 53, so that the resistance of the guide part 31b to the airflow can be reduced and the air volume can be increased. At the same time, the height of the part of the flow guide part 31b located at the constriction 513 is 3-6mm, and the flow guide part 31b has an obvious effect of preventing backflow.

Therefore, this design can minimize the obstruction to the airflow while maintaining a good anti-backflow effect.

Embodiment four

The difference between the cross-flow fan of Embodiment 4 and the cross-flow fan of Embodiment 1 is only that the structure of the flow guide part of the cross-flow fan of Embodiment 4 is different. In order to avoid repetition, only the differences between the two are introduced below.

As shown in FIG. 14 , a flow guiding portion 31c is provided on the side plate 3 , and the flow guiding portion 31c is configured as a rib. The air guide part 31 c is located on the side of the side plate 3 facing the cross-flow fan 6 , and the air guide part 31 c protrudes into the air outlet duct 51 . The flow guide portion 31c is located downstream of the cross-flow impeller 6 . The deflector 31c extends from the volute tongue 4 to the shroud 2 . The air guide part 31c may be substantially perpendicular to the air flow direction, and the air flow direction is along the air outlet duct 51 from the cross-flow fan wheel 6 to the air outlet 53. The flow guide part 31c may be disposed at the constriction 513 .

The air guide part 31c is provided on the side plate 3 to increase the resistance of the air outlet duct 51 at the guide part 31c. Under the extrusion of the air flow, the air pressure near the end of the cross-flow fan wheel 6 rises, which can weaken or even reduce the air pressure. The phenomenon that the airflow in the air outlet duct 51 flows back through the gap between the end face of the cross-flow rotor 6 and the side plate 3 is eliminated, thereby improving the efficiency of the cross-flow rotor 6 and reducing the abnormal sound of surge.

Embodiment five

The difference between the cross-flow fan in Embodiment 5 and the cross-flow fan in Embodiment 1 is that the structure of the flow guide part of the cross-flow fan in Embodiment 5 is different. In order to avoid repetition, only the differences between the two are introduced below.

As shown in FIG. 15 , each side plate 3 is provided with a plurality of flow guiding parts 31d. The flow guide 31d is configured as a cylinder, preferably a cylinder. The guide part 31d is located on the side of the side plate 3 facing the cross-flow impeller 6 , and the guide part 31d protrudes into the air outlet duct 51 . The flow guide portion 31 d is located downstream of the cross-flow rotor 6 , and the flow guide portion 31 d is also close to the cross-flow rotor 6 .

The plurality of flow guides 31d are arranged in a plurality of rows. The multiple rows of air guiding parts 31d are arranged in sequence along the flow direction of the airflow. The air flow direction is the direction along the air outlet duct 51 from the cross-flow fan wheel 6 to the air outlet 53 . In each row of air guides, a plurality of air guides 31d are arranged along a direction perpendicular to the flow direction of the airflow. All the flow guides 31d in the same row of flow guides have the same height. The height of the air guide part 31d in the single row air guide part increases gradually along the air flow direction of the multiple rows of air guide parts. The number of air guides 31d in the single row of air guides increases along the flow direction of the airflow.

The multiple rows of guide parts 31d are distributed in the area between the side plate 3 in the air outlet duct 51 from the constriction 513 to the cross-flow fan 6 , that is, the guide parts 31d are distributed in the part of the side plate 3 in the constricted section 511 .

The side plate 3 is provided with multiple rows of deflectors to increase the resistance of the air outlet duct 51 at the deflector 31d. Under the extrusion of the air flow, the air pressure near the end of the cross-flow fan wheel 6 rises, which can weaken the It even eliminates the phenomenon that the airflow in the air outlet duct 51 flows back through the gap between the end surface of the cross-flow rotor 6 and the side plate 3 , thereby improving the efficiency of the cross-flow rotor 6 and reducing the abnormal sound of surge. The height of the guide portion 31d gradually increases in the direction of the air flow, and the number of the guide portion 31d gradually increases. Therefore, there is no large sudden change in the wind resistance in the direction of the air flow, so that the output of the air flow is smoother. Therefore, this design can minimize the obstruction to the airflow while maintaining a good anti-backflow effect.

The above is only the preferred embodiment of the application, and does not limit the patent scope of the application. Under the conception of the application, the equivalent structural transformation made by using the specification and drawings of the application, or directly/indirectly used in Other relevant technical fields are included in the scope of patent protection of this application.

Claims (18)

1. A cross-flow fan, comprising a volute with an air supply duct inside and a cross-flow rotor arranged in the air supply duct;

   Wherein, the cross-flow wind wheel divides the air supply duct into an air inlet duct located upstream of the cross-flow wind rotor and an air outlet duct located downstream of the cross-flow wind rotor, and the air outlet duct is close to the A guide part is arranged on the side wall of the end part of the cross-flow wind wheel.
2. The cross-flow fan according to claim 1, wherein the volute comprises a shroud, two side plates respectively covering both sides of the shroud, and two side plates arranged between the two side plates and connected to two sides respectively. volute tongue of a side panel;

   The two side plates, the coaming plate and the volute tongue enclose the air supply duct, the axial direction of the cross-flow fan wheel is perpendicular to the side plates, and the guide part is arranged on the The side plate faces inwardly and is located at an end of the air outlet channel close to the cross-flow rotor.
3. The cross-flow fan according to claim 2, wherein, the guide part is configured as a boss, and a constriction is provided on the air outlet channel, and at the constriction, the shroud and the volute minimal spacing between tongues;

   The air guide part at least covers the area of the side plate in the air outlet duct from the constriction to the cross-flow fan wheel.
4. The cross-flow fan according to claim 3, wherein the guide part covers all areas of the side plate in the air outlet duct.
5. The cross-flow fan according to any one of claims 2 to 4, wherein the guide part is a platform, and the height of the guide part is 3-6mm.
6. The cross-flow fan according to claim 3 or 4, wherein the volute includes an air outlet arranged at the end of the air outlet channel away from the cross-flow rotor;

   Along the air outlet duct, in the direction from the air outlet to the cross-flow rotor or in the direction from the cross-flow rotor to the air outlet, the height of the guide portion gradually increases.
7. The cross-flow fan according to claim 6, wherein, at the constriction, the height of the guide part is 3-6mm.
8. The cross-flow fan according to claim 2, wherein each of the side plates is provided with a plurality of the guide parts, and the guide parts are configured as guide vanes protruding from the side plates;

   The cross-section of the guide part includes a windward front end and a leeward end, and the angle between the extension direction of the cross-section at the end of the end and the air flow direction at the end is an obtuse angle or a flat angle;

   A plurality of guide parts are arranged at intervals in sequence from the volute tongue to the coaming plate.
9. The cross-flow fan according to claim 8, wherein the value range of the included angle is 135°-180°.
10. The cross-flow fan according to claim 8, wherein the value range of the height of the guide part is 3-6mm.
11. The cross-flow fan according to claim 8, wherein the projections of the plurality of flow guiding parts on the first direction are sequentially connected end to end, and the air outlet direction of the cross-flow fan and the axial direction of the cross-flow fan wheel are both perpendicular to the first direction. one direction.
12. The cross-flow fan according to any one of claims 8 to 11, wherein a constriction is provided on the air outlet duct, and at the constriction, the gap between the shroud and the volute tongue Minimum spacing;

    The guide part is distributed in the area between the side plate in the air outlet duct from the constriction to the cross-flow fan wheel.
13. The cross-flow fan according to claim 2, wherein the guide part is configured as a rib, and the guide part extends from the shroud to the volute tongue.
14. The cross-flow fan according to claim 13, wherein a constriction is provided on the air outlet duct, and the distance between the shroud and the volute tongue is the smallest at the constriction;

    The flow guiding part is arranged at the constriction.
15. The cross-flow fan according to claim 2, wherein the air guide part is configured as a column protruding from the side plate, and there are a plurality of the air guide parts.
16. The cross-flow fan according to claim 15, wherein a constriction is provided on the air outlet duct, and the distance between the shroud and the volute tongue is the smallest at the constriction;

    A plurality of the guide parts are distributed in the area of the side plate in the air outlet channel from the constriction to the cross-flow fan wheel.
17. The cross-flow fan according to claim 16, wherein a plurality of the guide parts are arranged in multiple rows, and in each row of guide parts, a plurality of guide parts are arranged along a direction perpendicular to the flow direction of the airflow;

    The multiple rows of air guides are arranged sequentially along the direction of air flow, and the height of the air guides in the single row of air guides increases along the direction of the air flow, and the height of the air guides in the single row of air guides increase in number.
18. An air conditioner, comprising the cross-flow fan according to any one of claims 1-17.

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