Cross-flow fan, indoor unit, and air conditioner

Abstract

The embodiment provides a cross-flow fan, an indoor unit and an air conditioner, and belongs to the technical field of air conditioners. The cross-flow fan comprises a cross-flow fan, a front volute and a rear volute. The front volute and the rear volute are oppositely arranged, and one side forms an air outlet and the other side forms an air inlet. The cross-flow fan is rotatably arranged between the front volute and the rear volute. The side, close to the air inlet, of the front volute is provided with a front volute tongue, and the side, close to the air inlet, of the rear volute is provided with a rear volute tongue. The shortest line between the front volute tongue and the rear volute tongue and the setting direction of the air outlet has an included angle, wherein the shortest line passes through the center of the cross-flow fan, the included angle is A, and 25°<A<35°. The application improves the air volume of the cross-flow fan by adjusting the positions of the front volute tongue and the rear volute tongue.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a cross-flow fan, an indoor unit, and an air conditioner. Background Technology

[0002] Crossflow fans, also known as cross-flow fans, are characterized by high outlet dynamic pressure, long blowing distance, flat and uniform airflow, slender and compact structure, and low noise. They are widely used in air purification and dust removal, ventilation, automobiles, air conditioning, and many household appliances.

[0003] A cross-flow fan mainly consists of three parts: an impeller, a duct, and a motor. The impeller is a multi-bladed, long cylindrical shape with forward-curving multi-bladed blades. When the impeller rotates, the airflow enters the blade cascade from the open part of the impeller, passes through the interior of the impeller, and is discharged into the volute from the other side of the blade cascade, forming the working airflow.

[0004] The existing cross-flow fans have unreasonable duct structure settings, resulting in a small air volume output. Summary of the Invention

[0005] The problem solved by this invention is that the existing cross-flow fan has an unreasonable duct structure, resulting in a small air volume.

[0006] To address the aforementioned problems, embodiments of the present invention provide a cross-flow fan, an indoor unit, and an air conditioner. These solutions can improve the problem of unreasonable ductwork design in cross-flow fans and increase the airflow volume of the cross-flow fan.

[0007] In a first aspect, the present invention provides a cross-flow fan, comprising a cross-flow fan, a front volute, and a rear volute; the front volute and the rear volute are disposed opposite to each other, with an air outlet on one side and an air inlet on the other side; the cross-flow fan is rotatably disposed between the front volute and the rear volute; a front volute tongue is provided on the side of the front volute near the air inlet, and a rear volute tongue is provided on the side of the rear volute near the air inlet; the shortest line connecting the front volute tongue and the rear volute tongue forms an angle with the direction of the air outlet, wherein the shortest line passes through the center of the cross-flow fan, and the angle is A, where 25° < A < 35°.

[0008] This application improves the air volume of the cross-flow fan by adjusting the positions of the front and rear volute tongues and setting an angle A between the shortest line connecting the front and rear volute tongues through the center of the cross-flow fan and the direction of the air outlet, and ensuring that the angle A satisfies 25° < A < 35°.

[0009] In an optional implementation, 28° < A < 32°. Angle A satisfying 28° < A < 32° allows for a larger airflow from the cross-flow fan.

[0010] In an optional embodiment, the rear volute further includes a straight segment and an arc segment, the straight segment and the rear volute tongue being connected to both ends of the arc segment respectively, and the straight segment extending towards the front volute; the front volute includes a diffuser segment connected at an angle to the front volute tongue, the front volute tongue being disposed opposite to the cross-flow fan, the diffuser segment being disposed opposite to the straight segment, and the air outlet being formed between the end of the diffuser segment away from the front volute tongue and the end of the straight segment away from the arc segment.

[0011] The rear volute is formed by connecting a straight section, an arc section, and a rear volute tongue in sequence. This allows control over the diffusion level of the fluid within the flow channel, making the flow channel more conducive to fluid flow. The front volute is formed by connecting an angled diffuser section and a front volute tongue to make the flow field smoother, thereby increasing the airflow.

[0012] In an optional embodiment, the end of the rear volute tongue away from the arc segment extends away from the cross-flow fan, and the line connecting the end of the rear volute tongue near the arc segment and the end of the front volute tongue away from the diffuser segment is the shortest connection line. Extending the end of the rear volute tongue away from the arc segment away from the cross-flow fan increases the inlet flow rate. The shortest connection line between the end of the rear volute tongue near the arc segment and the end of the front volute tongue away from the diffuser segment allows the cross-flow fan to be closer to the inner side of the fan and the front volute, significantly reducing backflow at the front volute tongue, thereby increasing airflow and creating a smoother flow field.

[0013] In an optional embodiment, the straight line segment forms an angle with the direction in which the air outlet is located, and the angle is B, where 20° < B < 30°.

[0014] Setting the angle between the straight section and the air outlet to 20° < B < 30° can control the degree of fluid diffusion in the flow channel, making the flow channel more conducive to fluid flow.

[0015] In an optional implementation, 22.5° < B < 27.5°.

[0016] In an optional embodiment, the length of the straight segment is L1, the diffuser segment is straight, and the length of the diffuser segment is L2, where 2.2 < L1:L2 < 2.8.

[0017] This application optimizes the air outlet path by setting the ratio of the length L1 of the straight section to the length L2 of the diffuser section to 2.2 < L1:L2 < 2.8, which can better control the degree of diffusion of the fluid in the flow channel, thereby making the air outlet path more conducive to the flow of the fluid.

[0018] In an optional implementation, 2.4 < L1: L2 < 2.6.

[0019] Secondly, the present invention provides an indoor unit, including the cross-flow fan described in any of the foregoing embodiments.

[0020] This application adjusts the positions of the front and rear volutes, setting an angle A between the shortest line connecting the front and rear volutes through the center of the cross-flow fan and the direction of the air outlet, ensuring that angle A satisfies 25° < A < 35°. This changes the arrangement of the front and rear casings, thereby increasing the air volume of the indoor unit.

[0021] Thirdly, the present invention provides an air conditioner including the indoor unit described in the foregoing embodiments.

[0022] This application adjusts the positions of the front and rear volutes, setting an angle A between the shortest line connecting the front and rear volutes through the center of the cross-flow fan and the direction of the air outlet, ensuring that angle A satisfies 25° < A < 35°. This changes the arrangement of the front and rear casings, thereby increasing the air volume of the air conditioner. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the indoor unit provided in an embodiment of the present invention;

[0024] Figure 2 A comparison chart of the air volume of the cross-flow fan before and after the improvement provided in this embodiment of the invention.

[0025] Icons: 100-Cross-flow fan; 110-Cross-flow vent; 111-Air outlet; 113-Air inlet; 130-Front volute; 131-Front volute tongue; 133-Diffuser section; 150-Rear volute; 151-Rear volute tongue; 153-Straight section; 155-Circular section; 200-Indoor unit; 210-Rear panel; 230-Evaporator; 250-Panel; 251-Air outlet duct; 253-Air guide plate; 260-Accommodation space. Detailed Implementation

[0026] The existing cross-flow fans have unreasonable duct structure settings, resulting in a small air volume output.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, an embodiment of the present invention provides an air conditioner. The air conditioner includes an indoor unit 200 and an outdoor unit (not shown). The indoor unit 200 and the outdoor unit are connected by a pipe (not shown).

[0029] In this embodiment, the indoor unit 200 includes a rear panel 210, an evaporator 230, a cross-flow fan 100, and a panel 250. The rear panel 210 and the panel 250 enclose a receiving space 260, within which the cross-flow fan 100 and the evaporator 230 are both disposed. The air inlet 113 of the cross-flow fan 100 is positioned opposite to the evaporator 230. The panel 250 has an air outlet duct 251 communicating with the air outlet 111 of the cross-flow fan 100. A guide vane 253 is rotatably disposed within the air outlet duct 251.

[0030] In this embodiment, the cross-flow fan 100 includes a cross-flow fan 110, a front volute 130, and a rear volute 150. The front volute 130 and the rear volute 150 are arranged opposite to each other, with an air outlet 111 on one side and an air inlet 113 on the other side. The cross-flow fan 110 is rotatably disposed between the front volute 130 and the rear volute 150. A front volute tongue 131 is provided on the side of the front volute 130 near the air inlet 113, and a rear volute tongue 151 is provided on the side of the rear volute 150 near the air inlet 113. The shortest line connecting the front volute tongue 131 and the rear volute tongue 151 forms an angle with the direction of the air outlet 111, wherein the shortest line passes through the center of the cross-flow fan 110, and the angle is A, where 25° < A < 35°.

[0031] This application sets an angle A between the shortest line connecting the front volute 131 and the rear volute 151 through the center of the cross-flow fan 110 and the direction of the air outlet 111, and makes the angle A satisfy 25° < A < 35°, thereby changing the arrangement of the front volute 130 and the rear casing and increasing the air volume of the cross-flow fan 100.

[0032] It should be noted that the air outlet 111 is oriented in the front-rear direction of the indoor unit 200. After the indoor unit 200 is installed, the direction corresponding to the air outlet channel 251 on the panel 250 is front, and the direction corresponding to the rear panel 210 is rear. The air outlet 111 can also be oriented perpendicular to the plane where the air outlet 111 is located. The center of the cross-flow fan 110 refers to the rotation center of the cross-flow fan 110. The shortest connection line refers to the shortest connection line between the front volute 131 and the rear volute 151 through the center of the cross-flow fan 110. This shortest connection line is determined by rotating along the center of the cross-flow fan 110.

[0033] In this embodiment, the included angle A satisfies 28° < A < 32°. The air volume of the cross-flow fan 100 follows a normal distribution with respect to the included angle A. When the included angle A satisfies 28° < A < 32°, the air volume of the cross-flow fan 100 can be increased. Further, optionally, A is 32°.

[0034] In other embodiments of this application, the two endpoints of the range of A can also be any two integer values ​​among 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, and 35°. For example, A satisfies 28° < A < 35°, 27° < A < 32°, etc. The range of A can also be any sub-interval of 25° < A < 35°, without limiting the endpoint values ​​to integers, such as 25.5° < A < 34.5°, 30.5° < A < 34.5°, etc. It is understood that as long as the range of A is within the interval 25° < A < 35°, it is within the protection scope of this application.

[0035] In this embodiment, the rear volute 150 further includes a straight segment 153 and an arc segment 155. The straight segment 153 and the rear volute tongue 151 are respectively connected to both ends of the arc segment 155. The straight segment 153 extends towards the front volute 130. The front volute 130 includes a diffuser segment 133 connected at an angle to the front volute tongue 131. The front volute tongue 131 is disposed opposite to the cross-flow fan 110. The diffuser segment 133 is disposed opposite to the straight segment 153. An air outlet 111 is formed between the end of the diffuser segment 133 away from the front volute tongue 131 and the end of the straight segment 153 away from the arc segment 155. The rear volute 150 is formed by sequentially connecting the straight segment 153, the arc segment 155, and the rear volute tongue 151, which can control the degree of diffusion of the fluid in the flow channel, making the flow channel more conducive to fluid flow. The front volute 130 is formed by connecting the angled diffuser section 133 and the front volute tongue 131 to make the flow field smoother, thereby achieving the effect of increasing air volume.

[0036] In this embodiment, the end of the rear volute tongue 151 away from the arc segment 155 extends away from the cross-flow fan 110, and the line connecting the end of the rear volute tongue 151 near the arc segment 155 and the end of the front volute tongue 131 away from the diffuser segment 133 is the shortest connection line.

[0037] In this embodiment, the arc segment 155 is involute, with the distance from the end connecting the rear volute tongue 151 towards the end connecting the straight segment 153 and the edge of the cross-flow fan 110 increasing. This causes the flow channel formed by the cross-flow fan 110 and the arc segment 155 to gradually widen, facilitating airflow. The narrowest point of the flow channel is formed at the connection between the arc segment 155 and the rear volute tongue 151, preventing fluid leakage from the flow channel. The angle A can be changed by adjusting the position of the overall rear volute 150, or by shortening the length of the arc segment 155 or increasing the length of the rear volute tongue 151, thus changing the angle A between the shortest connecting line and the direction of the air outlet 111.

[0038] In this embodiment, the straight segment 153 and the air outlet 111 are arranged at an angle B, where 20° < B < 30°. Further, it can be selected as 22.5° < B < 27.5°. Setting the angle between the straight segment 153 and the air outlet 111 to 20° < B < 30° can control the degree of fluid diffusion within the flow channel, making the flow channel more conducive to fluid flow.

[0039] In this embodiment, the angle B between the straight line segment 153 and the setting direction of the air outlet 111 is 25°. Setting the angle B to 25° can increase the air volume of the air outlet 111, making the air volume of the air outlet 111 larger.

[0040] In other embodiments of this application, the two endpoints of the range of B can also be any two integer values ​​among 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, and 30°, for example, 22° < B < 27°, 25° < B < 29°. Of course, B is not limited to integers; the range of B can also be, for example, 22.5° < B < 27.5°, 20.5° < B < 29.5°, etc. It is understood that as long as the range of A is within the interval 20° < B < 30°, it is within the protection scope of this application.

[0041] In this embodiment, the length of the straight segment 153 is L1, and the diffuser segment 133 is straight. The length of the diffuser segment 133 is L2, where 2.2 < L1:L2 < 2.8. Setting the ratio of the length L1 of the straight segment 153 to the length L2 of the diffuser segment 133 to 2.2 < L1:L2 < 2.8 allows for better control of the diffusion degree of the fluid within the flow channel and improves backflow, thus facilitating fluid flow. Further, optionally, the ratio of the length L1 of the straight segment 153 to the length L2 of the diffuser segment 133 is 2.4 < L1:L2 < 2.6.

[0042] In this embodiment, L1:L2=2.5. This setting allows for better control of the diffusion degree of the fluid within the flow channel and improves backflow, thus promoting fluid flow.

[0043] In other embodiments of this application, the endpoints of the ratio range between the length L1 of the straight segment 153 and the length L2 of the diffuser segment 133 can also be any two values ​​from 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, and 2.8. For example, 2.3 < L1:L2 < 2.5 and 2.5 < L1:L2 < 2.5. It is understood that the ratio range between the length L1 of the straight segment 153 and the length L2 of the diffuser segment 133, within the range of 2.2 < L1:L2 < 2.8, is within the protection scope of this application.

[0044] like Figure 2An experiment was conducted to compare the airflow of the original cross-flow fan 100 and the improved cross-flow fan 100 of this application. The horizontal axis represents the rotational speed of the cross-flow fan 110, and the vertical axis represents the airflow of the cross-flow fan 100. Figure 2 It can be seen that the air volume of the improved cross-flow fan 100 is significantly better than that of the original cross-flow fan 100, especially the effect is more obvious when the speed of the cross-flow fan 110 is higher.

[0045] The working principle and beneficial effects of the cross-flow fan 100, indoor unit 200, and air conditioner provided in this embodiment include:

[0046] This application sets an angle A between the shortest line connecting the front volute 131 and the rear volute 151 through the center of the cross-flow fan 110 and the direction of the air outlet 111, and makes the angle A satisfy 25° < A < 35°, thereby changing the arrangement of the front volute 130 and the rear casing and increasing the air volume of the cross-flow fan 100.

[0047] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A cross-flow fan, used in an indoor unit, the indoor unit comprising an evaporator, characterized in that, The cross-flow fan (110), the front volute (130) and the rear volute (150); The front volute (130) is arranged opposite to the rear volute (150), and one side forms an air outlet (111) and the other side forms an air inlet (113); The air inlet (113) is arranged opposite to the evaporator; The cross-flow fan (110) is rotatably arranged between the front volute (130) and the rear volute (150); The front volute (130) is provided with a front volute tongue (131) on the side close to the air inlet (113), and the rear volute (150) is provided with a rear volute tongue (151) on the side close to the air inlet (113); The shortest line through the center of the cross-flow fan (110) between the front volute tongue (131) and the rear volute tongue (151) and the setting direction of the air outlet (111) has an included angle A, 25°<A<35°.

2. The cross-flow fan according to claim 1, characterized by 28°＜A＜32°。 3. The cross-flow fan according to claim 1 or 2, characterized in that, The rear volute (150) further comprises a straight line segment (153) and a circular arc segment (155), the straight line segment (153) and the rear volute tongue (151) are connected to the two ends of the circular arc segment (155) respectively, and the straight line segment (153) extends towards the front volute (130); The front volute (130) comprises an expansion section (133) which is connected to the front volute tongue (131) at an angle, the front volute tongue (131) is arranged opposite to the cross-flow fan, the expansion section (133) is arranged opposite to the straight line segment (153), and the end of the expansion section (133) away from the front volute tongue (131) and the end of the straight line segment (153) away from the circular arc segment (155) form the air outlet (111).

4. The cross-flow fan according to claim 3, characterized in that, The end of the rear volute tongue (151) away from the circular arc segment (155) extends away from the cross-flow fan (110), and the line connecting the end of the rear volute tongue (151) close to the circular arc segment (155) and the end of the front volute tongue (131) away from the expansion section (133) is the shortest line.

5. The cross-flow fan of claim 3, wherein The straight line segment (153) and the setting direction of the air outlet (111) have an included angle B, 20°<B<30°.

6. The cross-flow fan of claim 5, wherein, 22.5°＜B＜27.5°。 7. The cross-flow fan of claim 3, wherein The length of the straight line segment (153) is L1, the expansion section (133) is in a straight line shape, the length of the expansion section (133) is L2, and 2.2<L1:L2<2.

8.

8. The cross-flow fan of claim 7, wherein, 2.4<L1:L2<2.

6.

9. An indoor unit, characterized by comprising: The cross-flow fan (100) of any one of claims 1-8.

10. An air conditioner characterized by comprising: The indoor unit (200) of claim 9.

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