Cross-flow fan and air conditioner

Abstract

The utility model relates to the technical field of air conditioning, and discloses a cross-flow fan and an air conditioner. The cross-flow fan comprises a volute; the volute tongue and the volute define a mounting space with an air inlet channel and an air outlet channel; the cross-flow impeller is rotationally positioned in the mounting space; a backflow air channel is defined by the volute tongue, an outlet of the backflow air channel is communicated with the installation space, an inlet of the backflow air channel is communicated with the air outlet channel, and the backflow air channel is arranged in the extending direction of the backflow air channel in an equal-width mode. The volute tongue is provided with a backflow air duct which can restrain airflow from flowing back in the fan, eccentric vortexes are reduced, and the air volume and the pressure are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, for example, to a cross-flow fan and an air conditioner. Background Art

[0002] Most existing household appliances, especially indoor units of air conditioners, use cross-flow fans, so cross-flow fans have become a very widely used component in the field of household appliances.

[0003] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0004] The cross-flow fan in the related art has a large air volume loss and low pressure due to the backflow and the formation of eccentric vortex at the volute tongue.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Utility Model Content

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide a cross-flow fan and an air conditioner to suppress the backflow of air inside the fan, reduce eccentric vortices, and increase air volume and pressure.

[0008] An embodiment of the present disclosure provides a cross-flow fan, which includes: a volute; a volute tongue, which defines an installation space with an air inlet channel and an air outlet channel together with the volute; and a cross-flow impeller, which rotates within the installation space; wherein the volute tongue defines a return air duct, the outlet of the return air duct is connected to the installation space, the inlet of the return air duct is connected to the air outlet channel, and the return air duct is arranged with equal width along the extension direction of the return air duct.

[0009] Optionally, the width d of the return air duct is in the range of 0.008D≤d≤0.028D, where D is the outer diameter of the cross-flow impeller.

[0010] Optionally, the return air duct has a width d=0.0187D, where D is the outer diameter of the cross-flow impeller; and / or the return air duct is an arc-shaped channel that curves away from the volute.

[0011] Optionally, the shortest distance between the volute tongue and the outer peripheral surface of the cross-flow impeller is in the range of 0.55D≤L1≤0.65D, where D is the outer diameter of the cross-flow impeller.

[0012] Optionally, the volute tongue includes: a lower volute tongue; an upper volute tongue, located above the lower volute tongue, the upper volute tongue and the lower volute tongue are spaced apart, and the upper volute tongue and the lower volute tongue define a return air duct; wherein, the shortest distance between the center of the upper volute tongue and the side wall of the return air duct toward the lower volute tongue is in the range of 0.08D≤L2≤0.15D, and D is the outer diameter of the through-flow impeller.

[0013] Optionally, a horizontal distance between the center of the upper volute tongue and the center of the cross-flow impeller ranges from 0.52D≤L3≤0.72D.

[0014] Optionally, the center of the upper volute tongue is located above the center of the cross-flow impeller, and the vertical distance between the center of the upper volute tongue and the center of the cross-flow impeller is in the range of 0.08D≤L4≤0.28D.

[0015] Optionally, the side wall of the upper volute tongue facing away from the lower volute tongue is arc-shaped, and the arc bends toward the lower volute tongue, wherein the shortest distance between the arc-shaped side wall and the center of the upper volute tongue is in the range of 0.064D≤L5≤0.084D.

[0016] Optionally, an angle range between a tangent line of a lower end portion of the upper volute tongue facing the side wall of the cross-flow impeller and a radial direction of the cross-flow impeller is 45°≤a≤135°.

[0017] An embodiment of the present disclosure further provides an air conditioner, which includes the cross-flow fan as described in any one of the above embodiments.

[0018] The crossflow fan and air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0019] In the crossflow blower of the disclosed embodiment, the crossflow impeller rotates within the installation space, and the volute and volute cooperate to drive the airflow. The crossflow impeller drives airflow from the air inlet duct into the installation space, and then from the installation space to the air outlet duct. The volute is provided with a return air duct, which prevents air from flowing back inside the crossflow blower, reduces eccentric vortices, and effectively increases air volume and pressure.

[0020] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0022] Figure 1 This is a schematic cross-sectional view of a ducted air conditioner provided by an embodiment of the present disclosure;

[0023] Figure 2is a schematic cross-sectional view of another duct unit provided by an embodiment of the present disclosure;

[0024] Figure 3 This is a partial structural diagram of a ducted air conditioner provided by an embodiment of the present disclosure;

[0025] Figure 4 This is a simulation schematic diagram of a ducted air conditioner provided by an embodiment of the present disclosure;

[0026] Figure 5 is a simulation schematic diagram of another ducted air conditioner provided by an embodiment of the present disclosure;

[0027] Figure 6 is a simulation schematic diagram of another ducted air conditioner provided by an embodiment of the present disclosure;

[0028] Figure 7 is a simulation schematic diagram of another ducted air conditioner provided by an embodiment of the present disclosure;

[0029] Figure 8 is a simulation schematic diagram of another ducted air conditioner provided by an embodiment of the present disclosure;

[0030] Figure 9 is a simulation schematic diagram of another ducted air conditioner provided by an embodiment of the present disclosure;

[0031] Figure 10 is a simulation schematic diagram of another ducted air conditioner provided by an embodiment of the present disclosure;

[0032] Figure 11 This is a simulation schematic diagram of another duct air conditioner provided in an embodiment of the present disclosure.

[0033] Reference numerals:

[0034] 10. Crossflow fan; 101. Volute; 102. Volute tongue; 103. Return air duct; 1031. Upper volute tongue; 1032. Lower volute tongue; 104. Air inlet channel; 105. Air outlet channel; 106. Crossflow impeller; 107. Installation space; 20. Casing; 201. Heat exchanger; 202. Air inlet; 203. Air outlet. DETAILED DESCRIPTION

[0035] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0036] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that such terms are interchangeable where appropriate to describe the embodiments of the present disclosure. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0038] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0039] Unless otherwise stated, the term "plurality" means two or more.

[0040] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0042] For the convenience of description, the front, back, top and bottom directions of the embodiment of the present disclosure are as follows: Figure 1 shown.

[0043] The cross-flow fan 10 has the advantages of small radial size, low speed, low noise, and uniform air output. Its axial length can be arbitrarily lengthened without affecting the gas flow state. It is widely used in flat and long household appliances such as wall-mounted air conditioners, cabinet units, and tower fans.

[0044] Combine Figures 1 to 11As shown, an embodiment of the present disclosure provides a cross-flow blower 10, which includes a volute 101, a volute tongue 102 and a cross-flow impeller 106. The volute tongue 102 and the volute 101 define an installation space 107 having an air inlet channel 104 and an air outlet channel 105; the cross-flow impeller 106 rotates in the installation space 107.

[0045] In the disclosed embodiment, the volute 101 and the volute tongue 102 define an installation space 107, which is used to install the crossflow impeller 106. The crossflow impeller 106 is rotatably disposed within the installation space 107. The installation space 107 has an air inlet channel 104 and an air outlet channel 105, which are arranged in sequence along the direction of airflow. The air inlet channel 104 is provided with an air inlet 202, and the air outlet channel 105 is provided with an air outlet 203. When the crossflow impeller 106 rotates, the airflow from the air inlet 202 is driven to flow through the air inlet channel 104 into the crossflow impeller 106, flow in the radial direction of the crossflow impeller 106, and then, under the action of the volute tongue 102 and the volute 101, flow out in the radial direction of the crossflow impeller 106 into the air outlet channel 105, and then flow out through the air outlet 203.

[0046] The cross-flow impeller 106 includes a plurality of blades, which are arranged along the circumference of the axis of the cross-flow impeller 106 to form a cylindrical structure.

[0047] The volute tongue 102 is located on one side of the cross-flow impeller 106, and the volute tongue 102 is spaced apart from the cross-flow impeller 106. The volute tongue 102 is raised toward the wall portion of the cross-flow fan 10 to form the volute tongue 102. The main function of the volute tongue 102 is to prevent the flowing air from rotating back and forth in the volute 101, to cut off the airflow channel, and to change the direction of the airflow. At the same time, the airflow in the area corresponding to the volute tongue 102 is very complex, and an eccentric vortex of airflow is formed near the volute tongue 102 and the cross-flow impeller 106. The eccentric vortex will affect the flow field and noise level of the cross-flow fan 10. The blades of the cross-flow impeller 106 push the airflow to periodically and continuously impact the volute tongue 102. The collision of the airflow and the volute tongue 102 produces pulsating rotational noise. The rotation speed of the cross-flow impeller 106 and the shape of the volute tongue 102 corresponding to the airflow will affect the noise value.

[0048] The volute 101 collects and guides the gas leaving the crossflow impeller 106, gradually reducing the speed of the gas flow and converting part of the kinetic energy into static pressure. The flow path of the volute 101 gradually expands along the circumference of the crossflow impeller 106.

[0049] Optionally, the cross-section of the volute 101 is rectangular, so that the manufacturing process of the volute 101 is simple and easy to weld.

[0050] The air flow principle of the crossflow fan 10 is primarily based on Bernoulli's principle and the law of continuity. As the fan rotates, the blades of the crossflow impeller 106 rotate, drawing air into the impeller 106 and compressing and accelerating it axially. As the air passes through the impeller, its pressure and kinetic energy change. Ultimately, the compressed air passes through the inlet and outlet at high speed, generating a strong airflow.

[0051] Optionally, the air inlet 202 faces downward and the air outlet 203 faces forward.

[0052] In this way, when the cross-flow impeller 106 rotates, the driving airflow flows in from the lower air inlet 202 and then flows out from the front air outlet 203, so as to form a variety of air outlet forms and improve the air outlet flexibility of the components of the cross-flow fan 10.

[0053] Alternatively, as Figures 1 to 3 As shown, the volute tongue 102 defines a return air duct 103 , the outlet of the return air duct 103 is connected to the installation space 107 , and the inlet of the return air duct 103 is connected to the air outlet channel 105 .

[0054] In the disclosed embodiment, the inlet of the return air duct 103 is connected to the outlet air duct 105, and the outlet of the return air duct 103 corresponds to the crossflow impeller 106. In this way, part of the airflow from the outlet air duct 105 can flow through the return air duct 103 to the crossflow impeller 106, that is, flow back into the installation space 107. This can prevent the airflow from flowing back in the installation space 107, and can also prevent the formation of eccentric vortices and reduce the size of the eccentric vortices. This can effectively increase the air volume and pressure.

[0055] Optionally, the return air duct 103 is arranged to have a constant width along the extension direction of the return air duct 103 .

[0056] In the embodiment of the present disclosure, the return air duct 103 is set to have equal width, which can improve the processing convenience of the return air duct 103. Moreover, the setting of the return air duct 103 with equal width can ensure the flow speed of the airflow and avoid the airflow speed being too fast or too slow. This can reduce the impact of the airflow on the wall of the return air duct 103, thereby reducing the noise during the flow of the airflow, which can improve the comfort of the cross-flow fan 10 and the air conditioner during operation.

[0057] Alternatively, as Figure 2 As shown, the width d of the return air duct 103 is in the range of 0.008D≤d≤0.028D, where D is the outer diameter of the cross-flow impeller 106 .

[0058] In the disclosed embodiment, when the width d of the return duct 103 is less than 0.008D, the width of the return duct 103 is too small, resulting in greater resistance to airflow, affecting air volume and causing noise. When the width d of the return duct 103 is greater than 0.028D, the width of the return duct 103 is too large, causing a greater amount of airflow to flow into the return duct 103, affecting the air output of the cross-flow fan 10. Therefore, when the return duct 103 is within the above-mentioned width range, it can not only ensure the smooth flow of air in the return duct 103, but also reduce noise and ensure the air output volume and pressure of the cross-flow fan 10.

[0059] Optionally, the width d of the return air duct 103 is in the range of 0.015D≤d≤0.028D, or in the range of 0.01D≤d≤0.02D, or in the range of 0.01D≤d≤0.0195D, or in the range of d=0.0187D.

[0060] In the embodiment of the present disclosure, when the width of the return air duct 103 is 0.0187D, the width of the return air duct 103 can not only ensure the smooth flow of the airflow in the return air duct 103 and reduce the resistance of the return air duct 103, but also can control the size of the eccentric vortex, reduce the eccentric vortex, and increase the air volume and pressure.

[0061] For example, the width d of the return air duct 103 can be 0.015D, 0.016D, 0.017D, 0.0175D, 0.018D, 0.0185D, 0.0186D, 0.0187D, 0.0188D, 0.0189D, 0.019D, 0.02D, 0.025D, 0.028D, etc.

[0062] As shown in Table 1, the air volume data of the original solution (the solution without the return air duct) and the embodiment of the present disclosure are shown in Table 1:

[0063] Table 1

[0064]

[0065] From Table 1, Figure 4 and Figure 5 It can be seen that Figure 4 The initial duct mass flow rate of the Zhongyuan solution at the outlet with zero resistance is 0.486 kg / s, which is converted to a volume flow rate of 827 m3 / h. Figure 5 In the embodiment disclosed herein, when the outlet resistance is zero, the air duct mass flow rate is 0.672 kg / s, which is converted into a volume flow rate of 1144 m3 / h, and the air volume is increased by 33%.

[0066] Optionally, the return air duct 103 is an arc-shaped channel, and the arc-shaped channel bends in a direction away from the volute 101 .

[0067] In the embodiment of the present disclosure, the arc-shaped channel bends in a direction away from the volute 101, which can increase the length of the return air duct 103, and the arc-shaped channel can guide the airflow flowing into the inlet of the return air duct 103 to the cross-flow impeller 106, thereby improving the inhibitory effect of the return air duct 103 on the eccentric vortex.

[0068] Alternatively, as Figure 2 As shown, the shortest distance between the volute tongue 102 and the outer peripheral surface of the cross-flow impeller 106 is in the range of 0.55D≤L1≤0.65D.

[0069] In the embodiment of the present disclosure, the shortest distance between the volute tongue 102 and the outer peripheral surface of the cross-flow impeller 106 affects the airflow rate and flow field between the volute tongue 102 and the cross-flow impeller 106. The shortest distance between the volute tongue 102 and the outer peripheral surface of the cross-flow impeller 106 is between 0.55D and 0.65D, which can ensure the air outlet of the cross-flow fan 10, increase the air volume and reduce noise.

[0070] For example, the shortest distance between the volute tongue 102 and the outer peripheral surface of the cross-flow impeller 106 may be 0.55D, 0.57D, 0.58D, 0.59D, 0.60D, 0.62D, 0.65D, etc.

[0071] Alternatively, as Figure 1 and Figure 2 As shown, the volute tongue 102 includes a lower volute tongue 1032 and an upper volute tongue 1031, the upper volute tongue 1031 is located above the lower volute tongue 1032, the upper volute tongue 1031 and the lower volute tongue 1032 are spaced apart, and the upper volute tongue 1031 and the lower volute tongue 1032 define the return air duct 103; wherein, the shortest distance between the center of the upper volute tongue 1031 and the side wall of the return air duct 103 toward the lower volute tongue 1032 is in the range of 0.08D≤L2≤0.15D.

[0072] In the embodiment of the present disclosure, when the shortest distance between the center of the upper volute tongue 1031 and the side wall of the return air duct 103 facing the lower volute tongue 1032 is less than 0.08D, the return air duct 103 is too close to the crossflow impeller 106, so that the airflow in the outlet channel 105 is not easy to flow into the return air duct 103, making the return air duct 103 less effective in suppressing eccentric vortices. When the shortest distance between the center of the upper volute tongue 1031 and the side wall of the return air duct 103 facing the lower volute tongue 1032 is greater than 0.15D, the distance between the return air duct 103 and the crossflow impeller 106 is too large, and the distance between the return air duct 103 is also increased, and the distance from the outlet channel 105 to the crossflow impeller 106 is increased, which will result in greater flow resistance and poor power of the airflow, and the smoothness of the airflow in the return air duct 103 cannot be guaranteed. Therefore, the shortest distance between the center of the upper volute tongue 1031 and the side wall of the return air duct 103 toward the lower volute tongue 1032 is set within the above range. This can not only facilitate the airflow in the outlet channel 105 to flow into the return air duct 103, but also avoid the path of the return air duct 103 being too long and the airflow resistance being too large, thereby ensuring the suppression of the eccentric vortex and ensuring the air volume and pressure.

[0073] Optionally, the shortest distance between the center of the upper volute tongue 1031 and the side wall of the return air duct 103 facing the lower volute tongue 1032 is in the range of 0.1D≤L2≤0.12D.

[0074] Preferably, the shortest distance L2 between the center of the upper volute tongue 1031 and the side wall of the return air duct 103 facing the lower volute tongue 1032 is 0.11D.

[0075] In the embodiment of the present disclosure, the distance between the return air duct 103 and the upper volute tongue 1031 is set at this value, so as to ensure that the distance of the return air duct 103 is appropriate, and the return air duct 103 can prevent backflow of the cross-flow fan 10, suppress the size of the eccentric vortex, and thus ensure the air volume and pressure of the cross-flow fan 10.

[0076] Alternatively, as Figure 2 As shown, the horizontal distance between the center of the upper volute tongue 1031 and the center of the cross-flow impeller 106 ranges from 0.52D≤L3≤0.72D.

[0077] In the disclosed embodiment, the horizontal distance between the center of the upper volute 1031 and the center of the crossflow impeller 106 affects the return air volume and the size of the eccentric vortex. When the horizontal distance between the center of the upper volute 1031 and the center of the crossflow impeller 106 is less than 0.52D, the distance between the upper volute 1031 and the crossflow impeller 106 is too close, affecting the formation of the eccentric vortex, causing high noise and affecting the air output of the crossflow fan 10. When the horizontal distance between the upper volute 1031 and the center of the crossflow impeller 106 is greater than 0.62D, the distance between the upper volute 1031 and the crossflow impeller 106 is relatively large, and the upper volute 1031 has a weaker effect on the eccentric vortex, failing to effectively reduce the size of the eccentric vortex.

[0078] Optionally, a horizontal distance between the center of the upper volute tongue 1031 and the center of the cross-flow impeller 106 is in the range of 0.58D≤L3≤0.65D.

[0079] For example, the horizontal distance L3 between the center of the upper volute tongue 1031 and the center of the cross-flow impeller 106 is 0.52D, 0.54D, 0.55D, 0.57D, 0.6D, 0.62D, 0.65D, 0.7D, 0.71D, and 0.72D.

[0080] Optionally, the center of the upper volute tongue 1031 is located above the center of the cross-flow impeller 106 , and the vertical distance between the center of the upper volute tongue 1031 and the center of the cross-flow impeller 106 is in the range of 0.08D≤L4≤0.28D.

[0081] In the disclosed embodiment, the upper volute tongue 1031 is located above the center of the crossflow impeller 106. In this way, the return air duct 103 formed by the upper volute tongue 1031 and the lower volute tongue 1032 is close to the outlet air duct. In this way, the upper volute tongue 1031 can affect the center of the eccentric vortex, causing the eccentric vortex to move away from the center of the crossflow impeller 106, thereby increasing the air volume. When the vertical distance between the center of the upper volute tongue 1031 and the center of the crossflow impeller 106 is less than 0.08D, the upper volute tongue 1031 is too close to the center of the crossflow impeller 106, causing the eccentric vortex to approach the center of the crossflow impeller 106, thereby affecting the air volume. When the vertical distance between the center of the upper volute tongue 1031 and the center of the crossflow impeller 106 is greater than 0.28D, the upper volute tongue 1031 is close to the upper edge of the crossflow impeller 106, which will cause the eccentric vortex to be too close to the top or fail to form, thereby affecting the normal operation of the fan.

[0082] Optionally, a vertical distance between the center of the upper volute tongue 1031 and the center of the cross-flow impeller 106 ranges from 0.15D≤L4≤0.2D.

[0083] For example, the vertical distance between the center of the upper volute tongue 1031 and the center of the cross-flow impeller 106 is 0.08D, 0.09D, 0.1D, 0.11D, 0.13D, 0.15D, 0.18D, 0.2D, 0.25D, 0.28D, etc.

[0084] Optionally, the side wall of the upper volute tongue 1031 facing away from the lower volute tongue 1032 is arc-shaped and bends toward the lower volute tongue 1032 , wherein the shortest distance between the arc-shaped side wall and the center of the upper volute tongue 1031 is in the range of 0.064D≤L5≤0.084D.

[0085] In the disclosed embodiment, the sidewall of the upper volute tongue 1031 facing away from the lower volute tongue 1032 is curved. This allows the airflow between the upper volute tongue 1031 and the crossflow impeller 106 to flow along the sidewall of the upper volute tongue 1031 facing away from the lower volute tongue 1032, thereby reducing resistance to the airflow, reducing airflow losses, and ensuring the air volume of the crossflow fan 10. When the shortest distance between the curved sidewall and the center of the upper volute tongue 1031 is less than 0.064D, the size of the upper volute tongue 1031 is small, resulting in a small size of the return air duct 103, which is not conducive to the formation of eccentric vortices and also weakens the backflow suppression effect of the return air duct 103. When the shortest distance between the curved sidewall and the center of the upper volute tongue 1031 is greater than 0.084D, the size of the upper volute tongue 1031 is too large, increasing the resistance to the airflow and making it difficult to form eccentric vortices. The path of the return air duct 103 is also increased, reducing the air output efficiency of the crossflow fan 10.

[0086] Optionally, the shortest distance between the arc-shaped side wall and the center of the upper volute tongue 1031 is in the range of 0.07D≤L5≤0.075D.

[0087] For example, the shortest distance between the curved side wall and the center of the upper volute tongue 1031 can be 0.064D, 0.066D, 0.068D, 0.07D, 0.071D, 0.074D, 0.075D, 0.078D, 0.08D, 0.084D, etc.

[0088] Alternatively, as Figure 3 As shown, the angle range between the tangent line of the lower end portion of the upper volute tongue 1031 facing the side wall of the cross-flow impeller 106 and the radial direction of the cross-flow impeller 106 is 45°≤a≤135°.

[0089] In the disclosed embodiment, if the angle between the tangent line of the lower end of the upper volute tongue 1031 facing the side wall of the crossflow impeller 106 and the radial direction of the crossflow impeller 106 is less than 45 degrees, the distance between the upper volute tongue 1031 and the crossflow impeller 106 is too close, affecting the flow of air, reducing air volume, and increasing noise. If the angle between the tangent line of the lower end of the upper volute tongue 1031 facing the side wall of the crossflow impeller 106 and the radial direction of the crossflow impeller 106 is greater than 135 degrees, the distance between the upper volute tongue 1031 and the crossflow impeller 106 is too far, affecting the effect of the volute tongue 102 on the airflow, and thus affecting the normal operation of the crossflow blower 10.

[0090] Optionally, the angle range between the tangent line of the lower end of the upper volute tongue 1031 toward the side wall of the cross flow impeller 106 and the straight line where the radial direction of the cross flow impeller 106 lies is 90°≤a≤135°, or 60°≤a≤120°, or 100°≤a≤135°, etc.

[0091] Table 2

[0092]

[0093] From Table 2 and Figure 6 As shown in Table 2 and the attached diagram, the eccentric vortex of Example 1 is larger and the air volume is smaller. Figure 7 To the attached Figure 9 The eccentric vortex of the embodiment 2 shown is small, and the center of the eccentric vortex is far away from the center of the crossflow impeller 106. The air volume is large, the power is small, and the ratio of power to air volume is small. In this way, the crossflow fan 10 of embodiment 2 can not only ensure the air volume and air pressure, but also avoid the large ratio of power to air volume and the resulting large noise. Figure 10 To the attached Figure 11 As shown, the eccentric vortex of Example 3 is smaller, and the center of the eccentric vortex is far away from the center of the crossflow impeller 106, but its air volume and power are larger, resulting in a large noise of the crossflow blower 10.

[0094] An embodiment of the present disclosure further provides an air conditioner, which includes the cross-flow fan 10 according to any one of the above embodiments.

[0095] The air conditioner of the disclosed embodiment includes the cross-flow fan 10 of any of the above embodiments, and thus has the beneficial effects of the cross-flow fan 10 of any of the above embodiments, which will not be described in detail here.

[0096] Optionally, the air conditioner is a ducted air conditioner, a ceiling air conditioner, or a wall-mounted air conditioner.

[0097] Alternatively, as Figure 1 and Figure 2As shown, when the air conditioner is a ducted air conditioner, the ducted air conditioner includes a shell 20 and a heat exchanger 201. The shell 20 defines an installation cavity. The cross-flow fan 10 and the heat exchanger 201 are located in the installation cavity. An air inlet 202 is provided at the bottom of the installation cavity, and an air outlet 203 is provided on the front side of the installation cavity. The cross-flow fan 10 can drive the air flow to flow in from the air inlet 202 and then flow out from the air outlet 203. Along the flow of the air in the installation cavity, the cross-flow fan 10 and the heat exchanger 201 are arranged in sequence.

[0098] Optionally, along the front-to-back direction, the length D1 of the air inlet 202 is in the range of 1.4D≤D1≤1.6D.

[0099] In the disclosed embodiment, the length of the air inlet 202 along the front-to-back direction affects the air volume of the air inlet 202. When the length D1 is less than 1.4D, the area of the air inlet 202 is small, affecting the air volume of the ducted air conditioner. When D1 is greater than 1.6D, the area of the air inlet 202 is too large, which is prone to air leakage and affects the normal air output of the ducted air conditioner.

[0100] For example, D1 is 1.4D, 1.45D, 1.5D, 1.55D, 1.6D, etc.

[0101] Optionally, along the vertical direction, the length D2 of the air outlet 203 is in the range of 1.5D≤D2≤1.7D.

[0102] In the disclosed embodiment, the vertical length of the air outlet 203 affects the air volume. When D2 is less than 1.5D, the area of the air outlet 203 is small, the wind resistance is large, and the air volume is affected. When D2 is greater than 1.7D, the area of the air outlet 203 is large, and air leakage is likely to occur, affecting the cooling and heating effects.

[0103] For example, D2 is 1.5D, 1.55D, 1.6D, 1.65D, 1.7D, etc.

[0104] Optionally, the shell 20 further includes a protrusion, which protrudes upward from the bottom wall of the shell 20. The protrusion is located below the air outlet 203, and the distance between the protrusion and the bottom wall of the shell 20 is 0.25D-0.30D.

[0105] In the disclosed embodiment, the height of the protrusion affects the opening area of the air outlet 203 and the distance between the bottom of the air outlet 203 and the crossflow impeller 106. When the distance between the protrusion and the bottom wall of the housing 20 is less than 0.25D, the protrusion height is too low, resulting in excessive air flow and air leakage. When the distance between the protrusion and the bottom wall of the housing 20 is greater than 0.30D, the protrusion height is too high, significantly blocking the air flow from the fan, causing significant wind resistance and affecting air flow.

[0106] Optionally, the distance range of the housing 20 in the front-to-back direction is 3D≤L≤4D.

[0107] In the disclosed embodiment, when the distance between the front and rear directions of the housing 20 is less than 3D, the length of the housing 20 is short, making it inconvenient to install the heat exchanger 201 and the fan. This also results in a shorter airflow path, which is not conducive to sufficient heat exchange between the heat exchanger 201 and the airflow, thereby improving the cooling effect.

[0108] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cross-flow fan, characterized in that: include: volute; The volute tongue defines an installation space with an air inlet channel and an air outlet channel together with the volute; A cross-flow impeller, rotating within the installation space; The volute tongue defines a return air duct, the outlet of the return air duct is connected to the installation space, the inlet of the return air duct is connected to the air outlet channel, and the return air duct is arranged with equal width along the extension direction of the return air duct.

2. The cross flow fan according to claim 1, characterized in that The width d of the return air duct is in the range of 0.008D≤d≤0.028D, where D is the outer diameter of the cross-flow impeller.

3. The cross flow fan according to claim 1, characterized in that The width of the return air duct is d=0.0187D, where D is the outer diameter of the cross-flow impeller; and / or, The return air duct is an arc-shaped channel, and the arc-shaped channel bends in a direction away from the volute.

4. The cross flow fan according to claim 1, characterized in that The shortest distance between the volute tongue and the outer peripheral surface of the cross-flow impeller is in the range of 0.55D≤L1≤0.65D, where D is the outer diameter of the cross-flow impeller.

5. The cross flow fan according to claim 1, characterized in that The snail tongue includes: inferior cochlear tongue; An upper volute tongue is located above the lower volute tongue, the upper volute tongue and the lower volute tongue are spaced apart, and the upper volute tongue and the lower volute tongue define a return air duct; The shortest distance between the center of the upper volute tongue and the side wall of the return air duct toward the lower volute tongue is in the range of 0.08D≤L2≤0.15D, where D is the outer diameter of the cross-flow impeller.

6. The cross flow fan according to claim 5, characterized in that The horizontal distance between the center of the upper volute tongue and the center of the cross-flow impeller ranges from 0.52D≤L3≤0.72D.

7. The cross flow fan according to claim 5, characterized in that The center of the upper volute tongue is located above the center of the cross-flow impeller, and the distance between the center of the upper volute tongue and the center of the cross-flow impeller in the vertical direction ranges from 0.08D≤L4≤0.28D.

8. The cross flow fan according to claim 5, characterized in that The side wall of the upper volute tongue facing away from the lower volute tongue is arc-shaped and bends toward the lower volute tongue, wherein the shortest distance between the arc-shaped side wall and the center of the upper volute tongue is in the range of 0.064D≤L5≤0.084D.

9. The cross flow blower according to any one of claims 5 to 8, characterized in that: An angle range between a tangent line of a lower end portion of the upper volute tongue facing the side wall of the crossflow impeller and a radial direction of the crossflow impeller is 45°≤a≤135°.

10. An air conditioner, characterized in that: The invention comprises the cross flow blower according to any one of claims 1 to 9.

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