Cross-flow fan and duct type air conditioner

Abstract

The invention relates to the technical field of air conditioners, and discloses a cross-flow fan and a duct type air conditioner. The cross-flow fan comprises a volute; a mounting space is defined by the volute tongue structure and the volute; the cross-flow impeller is rotationally positioned in the mounting space; wherein the volute tongue structure partially protrudes to form a plurality of volute tongues, and the multiple volute tongues are used for reducing eccentric vortexes of the cross-flow fan. The multiple volute tongues can change the flow field of airflow at the eccentric vortex, reduce the backflow amount of air, restrain the size of the eccentric vortex and further reduce the eccentric vortex, and therefore the air volume and pressure of the cross-flow fan can be improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, for example to a cross-flow fan and a duct air conditioner. Background Technology

[0002] Most household appliances, especially air conditioner indoor units, use cross-flow fans, making them a widely used component in the home appliance industry. However, cross-flow fans in related technologies suffer from significant airflow loss and low pressure due to backflow and the formation of eccentric vortices at the volute tongue.

[0003] A cross-flow fan in related technologies generally includes a housing with an installation space inside; a volute housed within the installation space, the volute having an inlet duct and an outlet duct connected sequentially along the airflow direction; a cross-flow impeller rotatably mounted within the inlet duct; and a volute tongue structure located at the connection between the inlet and outlet ducts, the volute tongue structure having a guide side and a guide side on its adjacent sides, the guide side being opposite to the cross-flow impeller to define a return flow channel, the guide side being oriented towards the outlet duct, the volute tongue structure defining a jet channel, one end of the jet channel extending to the guide side to form a jet inlet, and the other end extending to the guide side to form a jet outlet, the jet channel having a speed-reducing structure to reduce the flow velocity of the jet within the jet channel.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] Although the jet channel in the cross-flow fan in the related technology can reduce the backflow of air and increase the air volume and pressure, the airflow impact in the jet channel will still cause sound and cause a lot of noise.

[0006] It should be noted that the information disclosed in the background section above 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 those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a cross-flow fan that can both increase the air volume and pressure of the cross-flow duct and reduce the noise of the cross-flow fan.

[0009] This disclosure provides a cross-flow fan, which includes: a volute; a volute tongue structure defining an installation space with the volute; and a cross-flow impeller rotatably located within the installation space; wherein the volute tongue structure protrudes to form multiple volute tongues, which are used to reduce the eccentric vortex of the cross-flow fan.

[0010] Optionally, the installation space includes an air inlet duct and an air outlet duct arranged sequentially along the airflow direction, and the plurality of volutes include: a first volute; and a second volute, located on the side of the first volute facing the air inlet duct, and the second volute protruding from the side of the first volute facing the cross-flow impeller.

[0011] Optionally, the horizontal distance between the first volute tongue and the second volute tongue is 0.02D≤d1≤0.18D, where D is the outer diameter of the cross-flow impeller; or, the horizontal distance between the first volute tongue and the second volute tongue is 0.089D≤d1≤0.092D, where D is the outer diameter of the cross-flow impeller.

[0012] Optionally, the vertical distance between the first volute tongue and the second volute tongue is 0.02D≤h1≤0.16D, where D is the outer diameter of the cross-flow impeller; or, the vertical distance between the first volute tongue and the second volute tongue is 0.08D≤h1≤0.09D, where D is the outer diameter of the cross-flow impeller.

[0013] Optionally, the horizontal distance between the second volute tongue and the center of the cross-flow impeller is 0.51D≤d2≤0.61D, where D is the outer diameter of the cross-flow impeller; and / or, the second volute tongue is located above the center of the cross-flow impeller, and the vertical distance between the second volute tongue and the center of the cross-flow impeller is 0.07D≤h2≤0.17D, where D is the outer diameter of the cross-flow impeller.

[0014] Optionally, the cross-flow fan further includes: an arc-shaped connecting edge connected between the first volute tongue and the second volute tongue, with the opening of the arc-shaped connecting edge facing upward.

[0015] Optionally, the angle between the tangent of the arc-shaped connecting edge toward the end of the second volute tongue and the vertical direction is in the range of 65°≤a≤100°; or, the cross-flow fan further includes: a first straight segment connected between the end of the arc-shaped connecting edge and the second volute tongue, the angle between the first straight segment and the vertical direction being in the range of 65°≤b≤100°.

[0016] Optionally, the cross-flow fan further includes: the angle between the tangent of the arc-shaped connecting edge facing the end of the first volute and the center line of the first volute is in the range of -30°≤c≤100°, and the center line of the first volute is a straight line extending vertically and passing through the end of the first volute; or, the cross-flow fan further includes: a second straight segment connecting the other end of the arc-shaped connecting edge and the first volute, the angle between the second straight segment and the center line of the first volute is in the range of -30°≤d≤100°, and the center line of the first volute is a straight line extending vertically and passing through the end of the first volute.

[0017] Optionally, the shortest distance between the volute tongue structure and the outer circumferential surface of the cross-flow impeller is 0.55D≤L1≤0.65D, where D is the outer diameter of the cross-flow impeller.

[0018] This disclosure also provides a duct air conditioner, which includes a cross-flow fan as described in any of the above embodiments.

[0019] The cross-flow fan and duct air conditioner provided in this disclosure can achieve the following technical effects:

[0020] In this embodiment of the cross-flow fan, the cross-flow impeller rotates within the installation space. The volute structure and volute casing work together to drive the airflow. The volute structure has multiple volutes, which can alter the airflow field at the eccentric vortex, reduce air backflow, suppress the size of the eccentric vortex, and thus reduce its size, thereby increasing the airflow and pressure of the cross-flow fan. Furthermore, by using multiple volutes, there is no need to open a jet channel in the volute structure, which avoids airflow impact with the jet channel and reduces the noise of the cross-flow fan.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a cross-sectional structural diagram of a duct air conditioner provided in an embodiment of this disclosure;

[0024] Figure 2 This is a cross-sectional structural schematic diagram of another duct machine provided in this embodiment of the present disclosure;

[0025] Figure 3 This is a simulation diagram of a ducted air conditioner provided in an embodiment of this disclosure;

[0026] Figure 4This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0027] Figure 5 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0028] Figure 6 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0029] Figure 7 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0030] Figure 8 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0031] Figure 9 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0032] Figure 10 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0033] Figure 11 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0034] Figure 12 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0035] Figure 13 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0036] Figure 14 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0037] Figure 15 This is a simulation diagram of another ducted air conditioner provided in this embodiment of the disclosure;

[0038] Figure 16 This is a partial structural schematic diagram of a duct air conditioner provided in an embodiment of this disclosure;

[0039] Figure 17 This is a partial structural schematic diagram of another ducted air handling unit provided in this embodiment of the present disclosure;

[0040] Figure 18 This is a partial structural schematic diagram of another ducted air handling unit provided in this embodiment of the present disclosure;

[0041] Figure 19 This is a partial structural schematic diagram of another ducted air handling unit provided in this embodiment of the present disclosure;

[0042] Figure 20This is a partial structural schematic diagram of another duct machine provided in an embodiment of this disclosure.

[0043] Figure label:

[0044] 10. Cross-flow fan; 101. Volute casing; 102. Volute tongue structure; 103. First volute tongue; 104. Second volute tongue; 105. Air inlet duct; 106. Air outlet duct; 107. Cross-flow impeller; 108. Arc-shaped connecting edge; 109. Second straight section; 20. Shell; 201. Heat exchanger; 202. Air inlet; 203. Air outlet. Detailed Implementation

[0045] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0046] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0047] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0048] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0049] Unless otherwise stated, the term "multiple" means two or more.

[0050] 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.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0052] For ease of description, the top, bottom, front, back, left, and right sides of this application are as follows: Figure 1 As shown.

[0053] The cross-flow fan 10 has advantages such as small radial dimension, low speed, low noise, and uniform air output. Its axial length can be arbitrarily extended without affecting the gas flow state, and it is widely used in flat and long household appliances such as wall-mounted air conditioners, floor-standing air conditioners, and tower fans. Currently, to address the problem of insufficient static pressure boosting capacity of the cross-flow fan 10, the airflow at the outlet 203 is generally introduced directly into the cross-flow impeller 107 through the air diversion channel. This can increase the strength of the eccentric vortex in the middle of the cross-flow impeller 107 and increase the static pressure coefficient of the fan. However, the direct impact of the airflow in the diversion channel on the cross-flow impeller 107 will cause significant impact noise, and the quality of the cross-flow fan 10 will be significantly reduced.

[0054] Combination Figures 1 to 20 As shown, this embodiment of the present disclosure provides a cross-flow fan 10, which includes a volute 101, a volute tongue structure 102, and a cross-flow impeller 107. The volute tongue structure 102 and the volute 101 define an installation space; the cross-flow impeller 107 rotates within the installation space.

[0055] In this embodiment, the volute 101 and the volute tongue structure 102 define an installation space for mounting the cross-flow impeller 107, which is rotatably disposed within the installation space. The installation space has an inlet duct 105 and an outlet duct 106 arranged sequentially along the airflow direction. The inlet duct 105 is provided with a fan inlet 202, and the outlet duct 106 is provided with a fan outlet 203. When the cross-flow impeller 107 rotates, the airflow driving the fan inlet 202 flows into the cross-flow impeller 107 through the inlet duct 105, flows radially along the cross-flow impeller 107, and then, under the action of the volute tongue structure 102 and the volute 101, flows radially out of the cross-flow impeller 107 into the outlet duct 106, and then flows out from the fan outlet 203.

[0056] The cross-flow impeller 107 includes multiple blades, which are arranged circumferentially along the axis of the cross-flow impeller 107 to form a cylindrical structure.

[0057] The volute tongue structure 102 is located on one side of the cross-flow impeller 107, and is spaced apart from the cross-flow impeller 107. The portion of the volute tongue structure 102 that protrudes towards the wall of the cross-flow fan 10 forms the volute tongue. The main function of the volute tongue is to prevent the flowing air from reciprocating within the volute casing 101, to block the airflow channel, and to change the airflow direction. Simultaneously, the airflow in the area corresponding to the volute tongue is very complex. An eccentric vortex is formed near the volute tongue and the cross-flow impeller 107, which affects the flow field and noise level of the cross-flow fan 10. The blades of the cross-flow impeller 107 drive the airflow to periodically and continuously impact the volute tongue. The impact between the airflow and the volute tongue generates pulsating rotational noise. The rotational speed of the cross-flow impeller 107 and the shape of the airflow corresponding to the volute tongue both affect the noise level.

[0058] The function of the volute 101 is to collect and guide the gas leaving the cross-flow impeller 107, so that the airflow velocity gradually decreases and some kinetic energy is converted into static pressure. The flow channel of the volute 101 gradually expands along the circumference of the cross-flow impeller 107.

[0059] Optionally, the volute 101 has a rectangular cross-section, which simplifies its manufacturing process and facilitates welding. Furthermore, any change in any structural parameter of the volute 101 will affect the internal flow field distribution of the indoor unit of the air conditioner, thereby affecting noise levels. Therefore, the volute 101 in the cross-flow fan 10 not only collects and guides gas but also influences the fan's noise performance through its structural parameters.

[0060] The air outlet principle of the cross-flow fan 10 is mainly based on Bernoulli's principle and the law of continuity. When the fan rotates, the blades of the cross-flow impeller 107 draw air into the interior of the impeller 107, compressing and accelerating it along the axial direction. As the airflow passes through the impeller, pressure and kinetic energy change. Ultimately, the compressed air passes through the inlet and outlet at high speed, generating a strong airflow.

[0061] Optionally, the fan inlet 202 faces downward and the fan outlet 203 faces forward.

[0062] In this way, when the cross-flow impeller 107 rotates, the driving airflow flows in from the fan inlet 202 below and then flows out from the fan outlet 203 in front, so as to form multiple air outlet patterns and improve the air outlet flexibility of the component where the cross-flow fan 10 is located.

[0063] Optionally, such as Figure 1 and Figure 2 As shown, the volute tongue structure 102 has a portion of protrusions forming multiple volute tongues, which are used to reduce the eccentric vortex of the cross-flow fan 10.

[0064] In this embodiment, the volute tongue structure 102 is constructed with multiple volute tongues, which can change the airflow smoothness in the corresponding area of ​​the volute tongues, reduce the air backflow, suppress the size of the eccentric vortex, and thus reduce the size of the eccentric vortex. This can improve the airflow and pressure of the cross-flow fan 10. This not only ensures airflow but also reduces noise.

[0065] Optionally, the number of volutes can be two, three, or more. In actual use, the number of volutes can be set according to the needs.

[0066] Optionally, multiple volute tongues are arranged sequentially at intervals along the circumferential direction of the wall of the volute tongue structure facing the cross-flow impeller. This can change the airflow field of the eccentric vortex, reduce the return air volume, and thus reduce the size of the eccentric vortex.

[0067] In some alternative embodiments, the plurality of volutes include a first volute 103 and a second volute 104, the second volute 104 being located on the side of the first volute 103 facing the air inlet duct 105, and the second volute 104 protruding from the side of the first volute 103 facing the cross-flow impeller 107.

[0068] In this embodiment, the second volute 104 and the first volute 103 are sequentially arranged along the direction from the air inlet duct 105 to the air outlet duct 106. This allows both the first volute 103 and the second volute 104 to block the recirculating airflow between the volute structure 102 and the cross-flow impeller 107, reducing the amount of recirculated air. Furthermore, this prevents the formation of a large eccentric vortex between the volute structure 102 and the cross-flow impeller 107, reducing the size of the eccentric vortex and minimizing airflow loss. The second volute 104 protrudes from the side of the first volute 103 facing the cross-flow impeller 107; that is, the distance between the second volute 104 and the cross-flow impeller 107 is less than the distance between the first volute 103 and the cross-flow impeller 107. This brings the second volute 104 closer to the cross-flow impeller 107, causing the center of the eccentric vortex to deviate from the center of the fan, reducing the size of the eccentric vortex, thereby reducing duct resistance and increasing airflow.

[0069] As shown in Table 1, the airflow data for single and double volute tongues are as follows:

[0070] Table 1

[0071]

[0072] From Table 1 and Figure 3 and Figure 4 It can be seen that the eccentric vortex of a single volute tongue is like... Figure 3 As shown, its eccentric vortex is close to the center of the cross-flow impeller 107, resulting in greater airflow resistance and smaller air volume. In contrast, the eccentric vortex of the double volute tongue... Figure 4 As shown, its eccentric vortex is significantly reduced and deviates from the center of the cross-flow impeller 107, which can increase the air volume.

[0073] Optionally, such as Figure 2 As shown, the horizontal distance between the first volute tongue 103 and the second volute tongue 104 is 0.02D≤d1≤0.18D, where D is the outer diameter of the cross-flow impeller 107.

[0074] In this embodiment, when the horizontal distance between the first volute tongue 103 and the second volute tongue 104 is less than 0.02D, the difference in the distance between their protrusions toward the cross-flow impeller 107 is small. This results in a smaller influence of the first volute tongue 103 and the second volute tongue 104 on the eccentric vortex, making it less effective at changing the center of the eccentric vortex and weakening its suppression effect on the eccentric vortex size, thus failing to significantly improve airflow. When the horizontal distance between the first volute tongue 103 and the second volute tongue 104 is greater than 0.18D, the distance is too great, causing either the first volute tongue 103 to move too far away from the cross-flow impeller 107 or the second volute tongue 104 to move too close to the cross-flow impeller 107. The first volute tongue 103 moving away from the cross-flow impeller 107 has a smaller impact on the return airflow and the eccentric vortex, while the second volute tongue 104 moving too close to the cross-flow impeller 107 affects the normal airflow output. Therefore, when the distance between the first volute tongue 103 and the second volute tongue 104 in the horizontal direction is within the range of 0.02D≤d1≤0.18D, it can not only ensure the normal air output of the cross-flow fan 10, but also reduce the eccentric vortex, increase the air volume, and reduce the noise.

[0075] Optionally, the horizontal distance between the first volute tongue 103 and the second volute tongue 104 is 0.05D≤d1≤0.1D, where D is the outer diameter of the cross-flow impeller 107.

[0076] In this embodiment of the present disclosure, the horizontal distance between the first volute tongue 103 and the second volute tongue 104 is further reduced, which can further improve the influence of the first volute tongue 103 and the second volute tongue 104 on the airflow field and reduce the eccentric vortex.

[0077] Optionally, the horizontal distance between the first volute tongue 103 and the second volute tongue 104 is in the range of 0.089D≤d1≤0.092D, where D is the outer diameter of the cross-flow impeller 107.

[0078] In this embodiment of the disclosure, when the distance between the first volute tongue 103 and the second volute tongue 104 in the horizontal direction is within the range of 0.089D≤d1≤0.092D, the size of the eccentric vortex can be further reduced, the air volume can be increased, and the noise can be reduced.

[0079] It should be noted that the horizontal distance between the first volute tongue 103 and the second volute tongue 104 refers to the horizontal distance between the ends of the first volute tongue 103 and the ends of the second volute tongue 104.

[0080] For example, the horizontal distance d1 between the first volute tongue 103 and the second volute tongue 104 can be 0.02D, 0.03D, 0.04D, 0.05D, 0.06D, 0.07D, 0.08D, 0.085D, 0.089D, 0.09D, 0.091D, 0.092D, 0.095D, 0.1D, 0.15D, 0.18D, etc.

[0081] Optionally, the outer diameter D of the cross-flow impeller 107 is in the range of 100mm≤D≤110mm.

[0082] Optionally, the vertical distance between the first volute tongue 103 and the second volute tongue 104 is in the range of 0.02D≤h1≤0.16D, where D is the outer diameter of the cross-flow impeller 107.

[0083] In this embodiment, the vertical distance between the first volute tongue 103 and the second volute tongue 104 affects the flow field of the return airflow. When the vertical distance between the first volute tongue 103 and the second volute tongue 104 is less than 0.02D, the distance between them is too close, resulting in a small impact on the airflow and thus greater resistance and lower air volume. When the vertical distance between the first volute tongue 103 and the second volute tongue 104 is greater than 0.16D, the distance is too far, which also weakens the influence of the first volute tongue 103 and the second volute tongue 104 on the airflow, resulting in greater resistance and lower air volume.

[0084] Optionally, the vertical distance between the first volute tongue 103 and the second volute tongue 104 is in the range of 0.05D≤h1≤0.1D, where D is the outer diameter of the cross-flow impeller 107.

[0085] In this embodiment of the present disclosure, the vertical distance between the first volute tongue 103 and the second volute tongue 104 is further reduced, so that the first volute tongue 103 and the second volute tongue 104 are within a suitable range, so as to further reduce the size of the eccentric vortex and increase the air volume.

[0086] Optionally, the vertical distance between the first volute tongue 103 and the second volute tongue 104 is in the range of 0.08D≤h1≤0.09D, where D is the outer diameter of the cross-flow impeller 107.

[0087] In this embodiment, when the distance between the first volute tongue 103 and the second volute tongue 104 is less than 0.08D, the airflow preventing backflow is relatively small, resulting in a smaller air volume. When the vertical distance between the first volute tongue 103 and the second volute tongue 104 is greater than 0.09D, although the air volume can be increased, it will lead to an increase in fan power, resulting in greater noise. Therefore, when the vertical distance between the first volute tongue 103 and the second volute tongue 104 is between 0.08D and 0.09D, both air volume can be guaranteed and noise can be reduced.

[0088] For example, the vertical distance between the first volute tongue 103 and the second volute tongue 104 is 0.02D, 0.04D, 0.05D, 0.07D, 0.08D, 0.084D, 0.09D, 0.1D, 0.11D, 0.12D, etc.

[0089] It should be noted that the vertical distance between the first volute tongue 103 and the second volute tongue 104 refers to the vertical distance between the ends of the first volute tongue 103 and the second volute tongue 104.

[0090] With other parameters of the cross-flow fan 10 remaining the same, this application provides three embodiments: Embodiment 1: the vertical distance h1 between the first volute tongue 103 and the second volute tongue 104 is 0.084D; Embodiment 2: the vertical distance h1 between the first volute tongue 103 and the second volute tongue 104 is 0.074D; Embodiment 3: the vertical distance h1 between the first volute tongue 103 and the second volute tongue 104 is 0.093D. The simulation results of the above three embodiments are shown in the figure. It can be seen that Embodiment 1 has a small eccentric vortex and the smallest ratio of airflow to power, thus ensuring airflow while reducing noise.

[0091] Table 2

[0092]

[0093] From Table 2 and Appendix Figure 5 To be continued Figure 8 As shown, in Embodiment 1, the eccentric vortex is smaller, its center is farther from the center of the cross-flow impeller 107, and its airflow is larger while its power is smaller, resulting in a smaller power-to-airflow ratio. Thus, the cross-flow fan 10 in Embodiment 1 can ensure both airflow and air pressure while avoiding a large power-to-airflow ratio that would cause excessive noise. (See Table 2 and Appendix...) Figure 9 To be continued Figure 11As shown, in Example 2, the eccentric vortex is smaller, and its center is far from the center of the cross-flow impeller 107. However, its airflow and power are also smaller. Thus, although the power-to-airflow ratio is smaller, the airflow is still smaller. (See Table 2 and Appendix...) Figure 12 To be continued Figure 15 As shown, the eccentric vortex in Example 3 is smaller, and the center of the eccentric vortex is far away from the center of the cross-flow impeller 107, but its air volume and power are larger, resulting in greater noise from the cross-flow fan 10.

[0094] Optionally, the horizontal distance between the center of the second volute tongue 104 and the center of the cross-flow impeller 107 is in the range of 0.51D≤d2≤0.61D, where D is the outer diameter of the cross-flow impeller 107.

[0095] In this embodiment, the distance between the second volute 104 and the cross-flow impeller 107 affects the return air volume and the size of the eccentric vortex. When the horizontal distance between the center of the second volute 104 and the center of the cross-flow impeller 107 is less than 0.51D, the distance between the second volute 104 and the cross-flow impeller 107 is too close, affecting the formation of the eccentric vortex, resulting in higher noise levels and affecting the air output of the cross-flow fan 10. When the horizontal distance between the center of the second volute 104 and the center of the cross-flow impeller 107 is greater than 0.61D, the distance between the second volute 104 and the cross-flow impeller 107 is relatively large, and the influence of the second volute 104 on the eccentric vortex is weak, failing to effectively reduce the size of the eccentric vortex.

[0096] For example, the horizontal distance between the center of the second volute tongue 104 and the center of the cross-flow impeller 107 is 0.51D, 0.52D, 0.54D, 0.55D, 0.56D, 0.58D, 0.59D, 0.6D, 0.61D, etc.

[0097] It should be noted that the horizontal distance between the second volute tongue 104 and the center of the cross-flow impeller 107 refers to the horizontal distance between the end of the second volute tongue 104 and the center of the cross-flow impeller 107.

[0098] Optionally, the second volute tongue 104 is located above the center of the cross-flow impeller 107, and the vertical distance between the second volute tongue 104 and the center of the cross-flow impeller 107 is in the range of 0.07D≤h2≤0.17D, where D is the outer diameter of the cross-flow impeller 107.

[0099] In this embodiment, the second volute tongue 104 is located above the circle of the cross-flow impeller 107, so that the second volute tongue 104 is close to the air outlet duct 106. This allows the second volute tongue 104 to influence the center of the eccentric vortex, causing the eccentric vortex to move away from the center of the cross-flow impeller 107 and increasing the air volume.

[0100] For example, the vertical distance between the center of the second volute tongue 104 and the center of the cross-flow impeller 107 is 0.07D, 0.08D, 0.09D, 0.10D, 0.11D, 0.115D, 0.12D, 0.13D, 0.15D, 0.17D, etc.

[0101] Optionally, the cross-flow fan 10 also includes an arc-shaped connecting edge 108, which is connected between the first volute tongue 103 and the second volute tongue 104, with the opening of the arc-shaped connecting edge 108 facing upward.

[0102] In this embodiment, the arc-shaped connecting edge 108 connects the first volute tongue 103 and the second volute tongue 104, allowing the airflow at the first volute tongue 103 to flow along the arc-shaped connecting edge 108 to the second volute tongue 104. The opening of the arc-shaped connecting edge 108 faces upward, allowing the airflow to move upward along the arc-shaped connecting edge 108, forming small vortices, thereby reducing the size of the eccentric vortex and increasing the airflow.

[0103] Optionally, the angle between the tangent of the arc-shaped connecting edge 108 toward the end of the second volute tongue 104 and the vertical direction is in the range of 65°≤a≤100°.

[0104] In this embodiment, when the angle between the tangent of the end of the arc-shaped connecting edge 108 facing the second volute tongue 104 and the vertical direction is less than 65°, the distance between the first volute tongue 103 and the second volute tongue 104 is too close, affecting the influence of the two volute tongues on the eccentric vortex. When the angle between the tangent of the end of the arc-shaped connecting edge 108 facing the second volute tongue 104 and the vertical direction is greater than 100°, the curvature angle of the arc-shaped connecting edge 108 is small, resulting in a smaller guiding effect on the airflow direction and thus a weaker effect on the eccentric vortex. Therefore, when the angle between the tangent of the end of the arc-shaped connecting edge 108 facing the second volute tongue 104 and the vertical direction is between 65° and 100°, it can guide the airflow and reduce the eccentric vortex.

[0105] Optionally, the cross-flow fan 10 also includes a first straight segment, which is connected between one end of the arc-shaped connecting edge 108 and the second volute tongue 104. The angle between the first straight segment and the vertical direction is in the range of 65°≤b≤100°.

[0106] In this embodiment of the present disclosure, a first straight segment is provided between the arc-shaped connecting edge 108 and the second volute tongue 104. The angle of the first straight segment is within the above-mentioned range, which can also guide the airflow and reduce the eccentric vortex.

[0107] Alternatively, 75°≤a≤90°, or 70°≤a≤80°, or 65°≤a≤80°.

[0108] Alternatively, 75°≤b≤90°, or 70°≤b≤80°, or 65°≤b≤80°.

[0109] This can further enhance the guiding effect of the curved connecting edge on the airflow, allowing the airflow to form vortices more quickly and reducing the size of the eccentric vortex.

[0110] For example, the angle α between the tangent of the arc-shaped connecting edge 108 toward the end of the second volute tongue 104 and the vertical direction is 65°, 70°, 75°, 80°, 85°, 90°, 90°, 100°, etc.

[0111] For example, the angle b between the first straight line segment and the vertical direction is 65°, 70°, 75°, 80°, 85°, 90°, 90°, 100°, etc.

[0112] Optionally, the angle between the tangent of the arc-shaped connecting edge 108 toward one end of the first volute tongue 103 and the center line of the first volute tongue 103 is in the range of -30°≤c≤100°. The center line of the first volute tongue 103 refers to the straight line that extends vertically and passes through the end of the first volute tongue 103.

[0113] In this embodiment, the arc-shaped connecting edge 108 can be directly connected to the first volute tongue 103. The angle between the tangent of the end of the arc-shaped connecting edge 108 facing the first volute tongue 103 and the centerline of the first volute tongue 103 can affect the flow direction of the airflow from the first volute tongue 103 to the second volute tongue 104. When c is less than -30°, the arc-shaped connecting edge 108 will be too long or the second volute tongue 104 will not be able to protrude from the first volute tongue 103, affecting the effect of the second volute tongue 104 on the airflow. When c is greater than 100°, the second volute tongue 104 will be too close to the cross-flow impeller 107, affecting the normal airflow of the cross-flow fan 10.

[0114] For example, c can be -30°, -10°, 0°, 10°, 29°, 30°, 40°, 60°, 80°, 90°, 100°, etc.

[0115] Optionally, such as Figures 16 to 18 As shown, the cross-flow fan 10 also includes a second straight segment 109, which is connected between the other end of the arc-shaped connecting edge 108 and the first volute tongue 103. The angle between the second straight segment 109 and the vertical direction is in the range of -30°≤d≤100°.

[0116] In this embodiment, the second straight segment 109 connects the first volute tongue 103 and the arc-shaped connecting edge 108. The angle between the second straight segment 109 and the vertical direction can affect the flow direction of the airflow from the first volute tongue 103 to the second volute tongue 104. When the angle between the second straight segment 109 and the vertical direction is less than -30°, the arc-shaped connecting edge 108 will be too long or the second volute tongue 104 will not be able to protrude beyond the first volute tongue 103, affecting the effect of the second volute tongue 104 on the airflow. When the angle between the second straight segment 109 and the vertical direction is greater than 100°, the second volute tongue 104 will be too close to the cross-flow impeller 107, affecting the normal airflow of the cross-flow fan 10.

[0117] Alternatively, -10°≤c≤60°. Or, 10°≤c≤60°, or 20°≤c≤35°.

[0118] Alternatively, -10° ≤ d ≤ 60°. Or, 10° ≤ d ≤ 60°, or 20° ≤ d ≤ 35°.

[0119] This ensures that the distance between the first and second volute tongues is moderate, which facilitates the setting of the arc-shaped connecting edge and avoids too many bends in the airflow path, thus preventing airflow loss.

[0120] For example, d can be -30°, -10°, 0°, 10°, 30°, 40°, 60°, 80°, 90°, 100°, etc.

[0121] Optionally, the shortest distance between the volute tongue structure 102 and the outer peripheral surface of the cross-flow impeller 107 is 0.55D≤L1≤0.65D, where D is the outer diameter of the cross-flow impeller 107.

[0122] In this embodiment, the shortest distance between the volute tongue and the cross-flow impeller 107 and its outer peripheral surface affects the airflow volume and flow field between the volute tongue structure 102 and the cross-flow impeller 107. The shortest distance between the volute tongue structure 102 and the outer peripheral surface of the cross-flow impeller 107 is between 0.55D and 0.65D, which can ensure the air output of the cross-flow fan 10, increase the air volume, and reduce noise.

[0123] This disclosure also provides a duct air conditioner, which includes a cross-flow fan 10 as described in any of the above embodiments.

[0124] The duct air conditioner of this disclosure includes the cross-flow fan 10 of any of the above embodiments, and therefore has the beneficial effects of the cross-flow fan 10 of any of the above embodiments, which will not be repeated here.

[0125] Optionally, the duct unit includes a housing 20 and a heat exchanger 201. The housing 20 defines an installation cavity. The cross-flow fan 10 and the heat exchanger 201 are located inside the installation cavity. An air inlet 202 is provided at the bottom of the installation cavity, and an air outlet 203 is provided at the front side of the installation cavity. The cross-flow fan 10 can drive airflow to flow in from the air inlet 202 and out from the air outlet 203. The cross-flow fan 10 and the heat exchanger 201 are arranged in sequence along the airflow in the installation cavity.

[0126] Optionally, the length D1 of the air inlet 202 in the front-to-back direction is in the range of 1.4D≤D1≤1.6D.

[0127] In this embodiment of the disclosure, the length of the air inlet 202 along the front-to-back direction affects the air intake volume of the air inlet 202. When the length D1 is less than 1.4D, the area of ​​the air inlet 202 is small, which affects the air intake volume of the duct 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 duct air conditioner.

[0128] For example, D1 can be 1.4D, 1.45D, 1.5D, 1.55D, 1.6D, etc.

[0129] Optionally, the length D2 of the air outlet 203 in the vertical direction is in the range of 1.5D≤D2≤1.7D.

[0130] In this 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, resulting in greater air resistance and affecting the air volume. When D2 is greater than 1.7D, the area of ​​the air outlet 203 is large, making it prone to air leakage and affecting the cooling and heating effect.

[0131] For example, D2 is 1.5D, 1.55D, 1.6D, 1.65D, 1.7D, etc.

[0132] Optionally, the housing 20 also includes a protrusion that protrudes upward from the bottom wall of the housing 20 and is located below the air outlet 203. The distance between the protrusion and the bottom wall of the housing 20 is 0.25D-0.30D.

[0133] In this 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 cross-flow impeller 107. 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 airflow and easy 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, obstructing the airflow from the fan and causing greater wind resistance, thus affecting airflow.

[0134] Optionally, the distance in the front-rear direction of the housing 20 is in the range of 3D≤L≤4D.

[0135] In this embodiment, when the front-to-back distance of the housing 20 is less than 3D, the length of the housing 20 is relatively small, which makes it inconvenient to arrange the heat exchanger 201 and the fan. It also results in a shorter airflow path, which is not conducive to sufficient heat exchange between the heat exchanger 201 and the airflow, thus hindering the improvement of cooling efficiency.

[0136] The foregoing description and accompanying drawings fully illustrate 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. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. 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 its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cross-flow fan, characterized in that, include: Snail shell; The volute tongue structure, together with the volute shell, defines the installation space; The cross-flow impeller rotates within the installation space. The volute tongue structure protrudes to form multiple volute tongues, which are used to reduce the eccentric vortex of the cross-flow fan.

2. The cross-flow fan according to claim 1, characterized in that, The installation space includes an air inlet duct and an air outlet duct arranged sequentially along the airflow direction, and the multiple volutes include: First cochlear tongue; The second volute tongue is located on the side of the first volute tongue facing the air inlet duct, and the second volute tongue protrudes from the side of the first volute tongue facing the cross-flow impeller.

3. The cross-flow fan according to claim 2, characterized in that, The horizontal distance between the first and second volute tongues is 0.02D ≤ d1 ≤ 0.18D, where D is the outer diameter of the cross-flow impeller; or, The horizontal distance between the first and second volute tongues is 0.089D≤d1≤0.092D, where D is the outer diameter of the cross-flow impeller.

4. The cross-flow fan according to claim 2, characterized in that, The vertical distance between the first and second volute tongues is 0.02D ≤ h1 ≤ 0.16D, where D is the outer diameter of the cross-flow impeller; or, The vertical distance between the first and second volute tongues is 0.08D≤h1≤0.09D, where D is the outer diameter of the cross-flow impeller.

5. The cross-flow fan according to claim 2, characterized in that, The horizontal distance between the second volute tongue and the center of the cross-flow impeller is within the range of 0.51D ≤ d2 ≤ 0.61D, where D is the outer diameter of the cross-flow impeller; and / or, The second volute is located above the center of the cross-flow impeller. The vertical distance between the second volute and the center of the cross-flow impeller is 0.07D≤h2≤0.17D, where D is the outer diameter of the cross-flow impeller.

6. The cross-flow fan according to claim 2, characterized in that, Also includes: An arc-shaped connecting edge connects the first and second volute tongues, with the opening of the arc-shaped connecting edge facing upwards.

7. The cross-flow fan according to claim 6, characterized in that, The angle between the tangent of the arc-shaped connecting edge towards the end of the second volute tongue and the vertical direction is in the range of 65°≤a≤100°; or, Also includes: The first straight segment connects one end of the arc-shaped connecting edge to the second volute tongue, and the angle between the first straight segment and the vertical direction is 65°≤b≤100°.

8. The cross-flow fan according to claim 6, characterized in that, Also includes: The angle between the tangent of the arc-shaped connecting edge towards the end of the first volute tongue and the centerline of the first volute tongue is in the range of -30°≤c≤100°, where the centerline of the first volute tongue is a straight line extending vertically and passing through the end of the first volute tongue; or, Also includes: The second straight segment connects the other end of the arc-shaped connecting edge to the first volute tongue. The angle between the second straight segment and the center line of the first volute tongue is in the range of -30°≤d≤100°. The center line of the first volute tongue is a straight line that extends vertically and passes through the end of the first volute tongue.

9. The cross-flow fan according to any one of claims 1 to 8, characterized in that, The shortest distance between the volute tongue structure and the outer circumferential surface of the cross-flow impeller is 0.55D≤L1≤0.65D, where D is the outer diameter of the cross-flow impeller.

10. A ducted air conditioner, characterized in that, Includes the cross-flow fan as described in any one of claims 1 to 9.

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