Patent Application
20240353115
The present patent application claims priority to Chinese patent application No. 202110988654. X, filed on Aug. 26, 2021, and entitled “AIR CONDITIONER AND CROSS-FLOW FAN THEREOF” and Chinese patent application No. 202122029133. X, filed on Aug. 26, 2021, and entitled “AIR CONDITIONER AND CROSS-FLOW FAN THEREOF,” the entire contents of both of which are incorporated herein by reference.
The present disclosure relates to the field of electrical equipment, in particular to an air conditioner and a cross-flow fan thereof.
In the related art, an air conditioner usually uses a cross-flow fan for air supply. As shown in
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the protection scope of the claims.
The main purpose of embodiments of the present application is to provide a cross-flow fan, aiming at solving the technical problems that the air supply efficiency of the cross-flow fan is reduced and abnormal surge sound is generated due to the backflow of airflow to both ends.
In order to achieve the above purpose, an embodiment of the present application provides a cross-flow fan, which includes a volute internally provided with an air supply duct and a cross-flow fan wheel disposed in the air supply duct. The cross-flow fan wheel divides the air supply duct into an air inlet duct located upstream of the cross-flow fan wheel and an air outlet duct located downstream of the cross-flow fan wheel, and a flow guide member is disposed at a side wall of the air outlet duct close to an end of the cross-flow fan wheel.
In a schematic embodiment, the volute includes a surrounding plate, two side plates respectively covering two sides of the surrounding plate, and a volute tongue disposed between the two side plates, and two sides of the volute tongue are connected with the two side plates respectively. The two side plates, the surrounding plate and the volute tongue enclose to form the air supply duct, an axial direction of the cross-flow fan wheel is perpendicular to the side plates, and the flow guide member is disposed at an inward-facing surface of the side plate and is located at an end of the air outlet duct close to the cross-flow fan wheel.
In a schematic embodiment, the flow guide member is configured as a boss, a necking is disposed at the air outlet duct, and a distance between the surrounding plate and the volute tongue is minimal at the necking. The flow guide member covers at least a region of the side plate between the necking and the cross-flow fan wheel in the air outlet duct.
In a schematic embodiment, the flow guide member covers all regions of the side plates in the air outlet duct.
In a schematic embodiment, the flow guide member is a platform, and the height of the flow guide member is 3-6 mm.
In a schematic embodiment, the volute includes an air outlet disposed at an end of the air outlet duct facing away from the cross-flow fan wheel. The height of the flow guide member along the air outlet duct in a direction from the air outlet to the cross-flow fan wheel or a direction from the cross-flow fan wheel to the air outlet gradually increases.
In a schematic embodiment, the height of the flow guide member at the necking is 3-6 mm.
In a schematic embodiment, each of the side plates is provided with a plurality of flow guide members, and the flow guide members are configured as flow guide vanes protruding from the side plates. A cross section of each flow guide member includes a windward front end and a leeward tail end, and the included angle between an extending direction of the cross section at a tip of the tail end and a flow direction of the airflow at the position where the tip is located is an obtuse angle or a flat angle. The plurality of flow guide members are arranged sequentially at intervals from the volute tongue to the surrounding plate.
In a schematic embodiment, the included angle is in the range of 135°-180°.
In a schematic embodiment, the height of the flow guide member is in the range of 3-6 mm.
In a schematic embodiment, the projections of the plurality of flow guide members in a first direction are connected end-to-end in sequence, and an air outlet direction of the cross-flow fan and an axial direction of the cross-flow fan wheel are both perpendicular to the first direction.
In a schematic embodiment, a necking is disposed at the air outlet duct, and the distance between the surrounding plate and the volute tongue is minimal at the necking. The flow guide members are distributed in the regions of the side plates between the necking and the cross-flow fan wheel in the air outlet duct.
In a schematic embodiment, the flow guide member is configured as a rib, and the flow guide member extends from the surrounding plate to the volute tongue.
In a schematic embodiment, a necking is disposed at the air outlet duct, and the distance between the surrounding plate and the volute tongue is minimal at the necking. The flow guide member is disposed at the necking.
In a schematic embodiment, the flow guide member is configured as a column projecting from the side plate, and a plurality of flow guide members are provided.
In a schematic embodiment, a necking is disposed at the air outlet duct, and the distance between the surrounding plate and the volute tongue is minimal at the necking. The plurality of flow guide members are distributed in the regions of the side plates between the necking and the cross-flow fan wheel in the air outlet duct.
In a schematic embodiment, the plurality of flow guide members are arranged in a plurality of rows, and the plurality of flow guide members in each row of the flow guide members are arranged in a direction perpendicular to a flow direction of the airflow. The plurality of rows of flow guide members are arranged sequentially along the flow direction of the airflow, and the height of the flow guide members in a single row of flow guide members increases and the number of flow guide members in a single row of flow guide members increases along the flow direction of the airflow for the plurality of rows of flow guide members.
An embodiment of the present application also provides an air conditioner, which includes the cross-flow fan as described above.
In the embodiments of the present application, a flow guide member is disposed at an end of the air outlet duct near the cross-flow fan wheel. The flow guide member can increase the air pressure near an end of the cross-flow fan wheel and/or guide the flow direction of the airflow at the end of the air outlet duct near the cross-flow fan wheel, so as to weaken or even eliminate the phenomenon that the airflow in the air outlet duct flows back through the gap between an end face of the cross-flow fan wheel and the volute, thereby improving the air supply efficiency of the cross-flow fan wheel and reducing abnormal surge sound.
Other aspects will become apparent after reading and understanding the drawings and detailed description.
In order to more clearly explain embodiments of the present application or the technical solution in the related art, the drawings required to be used in the description of the embodiments or the related art will be briefly described below. It will be obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained from the structure shown in these drawings without paying creative effort for those of ordinary skills in the art.
1
a—volute; 2a—cross-flow fan wheel; 1—volute; 2—surrounding plate; 21—second contraction plate; 22—second expansion plate; 3—side plate; 31—flow guide member; 31a—flow guide member; 311a—front end; 312a—tail end; 31b—flow guide member; 31c—flow guide member; 31d—flow guide member; 4—volute tongue; 41—first contraction plate; 42—first expansion plate; 5—air supply duct; 51—air outlet duct; 511—contraction section; 512—expansion section; 513—necking; 52—air inlet duct; 53—air outlet; 54—air inlet; 6—cross-flow fan wheel; 7—air deflector; 8—heat exchanger; 9—electric heater.
The realization of the object, functional features and advantages of the embodiments of the present application will be further explained in connection with the embodiments with reference to the drawings.
A clear and complete description of technical solutions of embodiments of the present application will be given below in conjunction with the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skills in the art without paying creative efforts fall within the scope of protection of the present application.
It should be noted that all directivity indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain relative positional relationship, motion situation, etc., among various components under a specific posture (as shown in the drawings). If the specific posture changes, the directivity indications also change accordingly.
In addition, descriptions such as those relating to “first,” “second” and the like in the embodiments of the present application are for descriptive purposes only and cannot be construed as indicating or implying their relative importance or implying the number of technical features indicated. Thus, the features defined with “first” or “second” may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, “a plurality of” means at least two, e.g., two, three, etc., unless explicitly and specifically defined otherwise.
In the embodiments of the present application, the terms “connect,” “fix” and the like should be understood broadly unless otherwise expressly specified and limited. For example, “fix” may be a fixed connection, may be a detachable connection, or may be an integrated connection. It may be a mechanical connection or an electrical connection. It may be a direct connection or indirect connection through an intermediate medium, or may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise expressly defined. For those of ordinary skills in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.
In addition, the technical solutions among the various embodiments of the present application may be combined with each other, but must be on the basis that those of ordinary skills in the art can realize them. When the combination of technical solutions conflicts or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.
As shown in
In this embodiment, as shown in
The cross-flow fan wheel 6 is disposed in the air supply duct 5 of the volute 1. An axis of the cross-flow fan wheel 6 is perpendicular to the two side plates 3, and the cross-flow fan wheel 6 can rotate about its own axis. An inward-facing surface of the side plate 3 is an inner surface of an air outlet duct 51, and a gap is formed between the side plate 3 and an end face of the cross-flow fan wheel 6. The surrounding plate 2 and the volute tongue 4 half-surround the cross-flow fan wheel 6 in a circumferential direction of the cross-flow fan wheel 6. The cross-flow fan 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, flows through the air supply duct 5 and is discharged from the air outlet 53. The cross-flow fan wheel 6 divides the air supply duct 5 into an air inlet duct 52 and an air outlet duct 51. The air inlet duct 52 is located upstream of the cross-flow fan wheel 6, and the air outlet duct 51 is located downstream of the cross-flow fan. The air inlet 54 is located at an end of the air inlet duct 52 facing away from the cross-flow fan wheel 6, and the air outlet 53 is located at an end of the air outlet duct 51 facing away from the cross-flow fan wheel 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 disposed in the air inlet 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 the airflow. The air deflector 7 is disposed at the air outlet 53, and the angle of the air outlet and the opening degree of the air outlet 53 can be adjusted by rotating the air deflector 7.
A flow guide member 31 is disposed at the side plate 3. The flow guide member 31 is provided to reduce the width of the air outlet duct 51 in an axial direction of the cross-flow fan wheel 6 or guide the airflow to flow toward the downstream of the air outlet duct 51 to prevent the airflow in the air outlet duct 51 from flowing back to the cross-flow fan wheel 6. The flow guide member 31 may be configured as a boss. The flow guide member 31 is located on the side of the side plate 3 facing the cross-flow fan wheel 6, and protrudes into the air outlet duct 51. The flow guide member 31 is located downstream of the cross-flow fan wheel 6, and is also close to the cross-flow fan wheel 6.
When the air deflector 7 is rotated to a position where the opening degree of the air outlet 53 is small, if the flow guide member 31 is not provided, abnormal surge sound is easily generated at the end of the cross-flow fan wheel 6. By research, it is found that a gap must be provided between the end face of the cross-flow fan wheel 6 and the inner surface of the air outlet duct 51, which can prevent the end face of the cross-flow fan wheel 6 from rubbing against the inner surface of the air outlet duct 51. The width of the gap is usually more than 4 mm. The air pressure of a side of the cross-flow fan wheel 6 at the air outlet duct 51 is positive, the air pressure of a side of the cross-flow fan wheel at the air inlet duct 52 is negative, and the air pressure of the side of the cross-flow fan wheel 6 at the air outlet duct 51 is greater than that of the side of the cross-flow fan wheel at the air inlet duct 52. When the opening degree of the air outlet 53 is small, the airflow will flow back toward the air inlet duct 52 along the gap between the end face of the cross-flow fan wheel 6 and the inner surface of the air outlet duct 51, resulting in the decrease of the efficiency of the cross-flow fan wheel 6 and the generation of abnormal surge sound.
In a technical solution of this embodiment, as shown in
In a schematic embodiment, the flow guide member 31 is a platform, a top surface of the flow guide member 31 and the plate surface of the side plate 3 are parallel to each other, and the height H of the flow guide member 31 may be 3-6 mm. The height of the flow guide member 31 is a distance between an end of the flow guide member 31 near the side plate 3 and an end of the flow guide member 31 facing away from the side plate 3.
When the height of the flow guide member 31 is greater than 6 mm, the flow guide member 31 causes the wind resistance in the air outlet duct 51 to increase significantly, thereby affecting the flow of airflow in the air supply duct 5. When the height of the flow guide member 31 is less than 3 mm, the backflow prevention effect of the flow guide member 31 is not particularly obvious.
In a schematic embodiment, as shown in
The surrounding plate 2 includes a second contraction plate 21 and a second expansion 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 expansion plate 22 may be a flat plate. One end of the second contraction plate 21 is connected to the second expansion plate 22. There may be a smooth transition connection between the second contraction plate 21 and the second expansion plate 22.
Two ends of the first contraction plate 41 are respectively aligned with two ends of the second contraction plate 21. The first contraction plate 41, the second contraction plate 21 and the two side plates 3 enclose to form a contraction section 511 of the air outlet duct 51. The first expansion plate 42 and the second expansion plate 22 are located on the same side of the contraction section 511, and the first expansion plate 42, the second expansion plate 22 and the two side plates 3 enclose to form an expansion section 512 of the air outlet duct 51. The distance between the first contraction plate 41 and the second contraction plate 21 has a tendency to decrease in the direction close to the expansion section 512, and the distance between the first expansion plate 42 and the second expansion plate 22 has a tendency to decrease in the direction close to the contraction section 511. A portion of the air outlet duct 51 between the junction of the first contraction plate 41 and the first expansion plate 42 and the junction of the second contraction plate 21 and the second expansion plate 22 is a necking 513 of the air outlet duct 51. The distance between the surrounding plate 2 and the volute tongue 4 is minimal at the necking 513.
The air outlet duct 51 includes the above-mentioned contraction section 511 and the above-mentioned expansion section 512. One end of the contraction section 511 is connected to one end of the expansion section 512. The cross-flow fan wheel 6 is disposed at an end of the contraction section 511 facing away from the expansion section 512. The cross-sectional area of the contraction section 511 tends to decrease in a direction from an end of the contraction section 511 facing away from the expansion section 512 to an end of the contraction section 511 close to the expansion section 512. The cross-sectional area of the expansion section 512 tends to decrease in a direction from an end of the expansion section 512 facing away from the contraction section 511 to an end of the expansion section 512 close to the contraction section 511. The air outlet duct 51 is formed with a necking 513 at the junction between the contraction section 511 and the expansion section 512, and the cross-sectional area of the air outlet duct 51 is minimal at the necking 513.
As shown in
In a schematic embodiment, as shown in
When the flow guide member 31 covers this region, the region of the side plate 3 from the air outlet 53 to the cross-flow fan wheel 6 is covered with the flow guide member 31, and a wall surface of the air outlet duct 51 is continuous and has an aesthetics appearance. At the same time, this region includes the region of the side plate 3 between the necking 513 and the cross-flow fan wheel 6 in the air outlet duct 51, so that the backflow phenomenon and abnormal surge sound can be eliminated.
In a schematic embodiment, the height of the flow guide member 31 is gradually changed, and the height of the flow guide member 31 is gradually increased in the direction of the air outlet duct 51 from the air outlet 53 to the cross-flow fan wheel 6. At the necking 513, the height of the flow guide member 31 is 3-6 mm. The height of the flow guide member 31 is a distance between an end of the flow guide member 31 close to the side plate 3 and an end of the flow guide member 31 facing away from the side plate 3.
The height of the flow guide member 31 at a side thereof near the air outlet 53 is less than the height of the flow guide member 31 at a side thereof near the cross-flow fan wheel 6, so that the resistance of the flow guide member 31 to the airflow can be reduced and the airflow volume can be increased. At the same time, the height of a portion of the flow guide member 31 located at the necking 513 is 3-6 mm, and the flow guide member 31 has an obvious backflow prevention effect.
Therefore, this design can reduce the obstruction to airflow as much as possible, and at the same time maintain a good backflow prevention effect.
In a schematic 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 disposed in the air inlet duct 52 and is located downstream of the heat exchanger 8. The electric heater 9 can convert electric energy into heat energy after the power supply is turned on. In a heating mode of the air conditioner, the electric heater 9 can assist in heating the airflow.
A cross-flow fan of the second embodiment is different from the cross-flow fan of the first embodiment only in that the cross-flow fan of the second embodiment is different in the structure of the flow guide member. In order to avoid repeating, only the differences between the two embodiments are introduced below.
As shown in
The cross section of the flow guide member 31a is configured as a wing-shaped cross section. The cross section of the flow guide member 31a includes a front end 311a on the windward side of the flow guide member 31a and a tail end 312a on the leeward side of the flow guide member 31a. The front end 311a is smooth and the tail end 312a is sharp. At the tip of the tail end 312a, there is an included angle a between an extending direction of the cross section of the flow guide member 31a and a flow direction of the airflow at the position where the tip is located, which is an obtuse angle or a flat angle. The plurality of flow guide members 31a are arranged sequentially at intervals in a direction from the volute tongue 4 to the surrounding plate 2. A wind passage gap is formed between two adjacent flow guide members 31a. The projections of the plurality of flow guide members 31a in a first direction are connected end-to-end in sequence. The first direction is perpendicular to the air outlet direction of the air outlet 53 and to the axial direction of the cross-flow fan wheel 6.
As shown in
In a schematic embodiment, the included angle a between the extending direction of the cross section of the flow guide member 31a and the flow direction of the airflow at the position where the tip is located is in the range of 135°-180°.
The included angle a in this range has the best effect of blocking backflow, and surge is difficult to occur.
In a schematic embodiment, the height of the flow guide member 31a at the tip of the tail end 312a is in the range of 3-6 mm. The height of the flow guide member 31a is a distance between an end of the flow guide member 31a near the side plate 3 and an end of the flow guide member 31a facing away from the side plate 3.
When the height of the flow guide member 31a is greater than 6 mm, the flow guide member 31a significantly increases the wind resistance in the air outlet duct 51, thereby affecting the flow of the airflow in the air supply duct 5. When the height of the flow guide member 31a is less than 3 mm, the backflow prevention effect of the flow guide member 31a is not particularly obvious.
A cross-flow fan of the third embodiment is different from the cross-flow fan of the first embodiment only in that the cross-flow fan of the third embodiment is different in the structure of the flow guide member. In order to avoid repeating, only the differences between the two embodiments are introduced below.
As shown in
The height of the flow guide member 31b is gradually changed. The height of the flow guide member 31b is gradually increased in the direction from the cross-flow fan wheel 6 to the air outlet 53 along the air outlet duct 51, that is, in the flow direction of airflow. At the necking 513, the height of the flow guide member 31b is 3-6 mm. The height of the flow guide member 31b is a distance between an end of the flow guide member 31b near the side plate 3 and an end of the flow guide member 31b facing away from the side plate 3.
By providing the guide portion 31b on the side plate 3, the width of the air outlet duct 51 along the axial direction of the cross-flow fan wheel 6 at the flow guide member 31b may be reduced, and the width is less than the width of the air inlet duct 52 along the axial direction of the cross-flow fan wheel 6. Thus, the air pressure near the end of the cross-flow fan wheel 6 increases under the compression of the airflow, 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 face of the cross-flow fan wheel 6 and the side plate 3, thereby improving the efficiency of the cross-flow fan wheel 6 and reducing the abnormal surge sound. The height of the flow guide member 31b at a side thereof near the cross-flow fan wheel 6 is less than the height of the flow guide member 31b at a side thereof near the air outlet 53, so that the resistance of the flow guide member 31b to the airflow can be reduced and the airflow volume can be increased. Meanwhile, the height of a portion of the flow guide member 31b located at the necking 513 is 3-6 mm, and the flow guide member 31b has an obvious backflow prevention effect.
Therefore, this design can reduce the obstruction to airflow as much as possible, and at the same time maintain a good backflow prevention effect.
A cross-flow fan of the fourth embodiment is different from the cross-flow fan of the first embodiment only in that the cross-flow fan of the fourth embodiment is different in the structure of the flow guide member. In order to avoid repeating, only the differences between the two embodiments are introduced below.
As shown in
The flow guide member 31c provided on the side plate 3 can increase the resistance of the air outlet duct 51 at the flow guide member 31c, and the air pressure near the end of the cross-flow fan wheel 6 increases under the compression of the airflow, 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 face of the cross-flow fan wheel 6 and the side plate 3, thereby improving the efficiency of the cross-flow fan wheel 6 and reducing the abnormal surge sound.
A cross-flow fan of the fifth embodiment is different from the cross-flow fan of the first embodiment only in that the cross-flow fan of the fifth embodiment is different in the structure of the flow guide member. In order to avoid repeating, only the differences between the two embodiments are introduced below.
As shown in
The plurality of flow guide members 31d are arranged in a plurality of rows. The plurality of rows of flow guide members 31d are arranged sequentially along the flow direction of the airflow. The flow direction of the airflow is the direction from the cross-flow fan wheel 6 to the air outlet 53 along the air outlet duct 51. In each row of flow guide members, the plurality of flow guide members 31d are arranged perpendicular to the flow direction of the airflow. All the flow guide members 31d in the same row of flow guide members have the same height. The height of the flow guide members 31d in the single row of the flow guide members gradually increases in the flow direction of the airflow for the plurality of rows of flow guide members. The number of flow guide members 31d in the single row of flow guide members increases in the flow direction of the airflow for the plurality of rows of flow guide members 31d .
The plurality of rows of flow guide members 31d are distributed in a region of the side plate 3 between the necking 513 and the cross-flow fan wheel 6 in the air outlet duct 51. That is, the flow guide members 31d are distributed in a portion of the side plate 3 in the contraction section 511.
The plurality of rows of flow guide members disposed at the side plate 3 can increase the resistance of the air outlet duct 51 at the flow guide members 31d, and the air pressure near the end of the cross-flow fan wheel 6 increases under the compression of the airflow, 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 face of the cross-flow fan wheel 6 and the side plate 3, thereby improving the efficiency of the cross-flow fan wheel 6 and reducing the abnormal surge sound. Since the height of the flow guide members 31d gradually increases in the flow direction of the airflow and the number of the flow guide members 31d gradually increases, there is no large abrupt change in the wind resistance in the flow direction of the airflow and the airflow output is relatively smooth. Therefore, this design can minimize the obstruction to airflow as much as possible, and at the same time maintain a good backflow prevention effect.
The above descriptions are only preferred embodiments of the present application, and therefore do not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the description and drawings of the present application, or direct/indirect application in other related technical fields, within the concept of the present application, is included in the patent protection scope of the present application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110988654.X | Aug 2021 | CN | national |
| 202122029133.X | Aug 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/123603 | 10/13/2021 | WO |
