A volute tongue structure of a crossflow air duct, an air duct system and an air conditioner indoor unit

Abstract

The present invention relates to the field of air conditioning equipment, and specifically discloses a volute tongue structure of a cross-flow air duct, an air duct system and an air conditioning indoor unit, which includes a volute tongue body, on which a windward surface and a wind guide surface are provided, and the cross-flow air duct also includes a fan, and the gap between the windward surface and the outer contour of the fan gradually decreases along the flow direction of the airflow. According to the present invention, the gap between the windward surface of the volute tongue and the outer contour of the fan is designed to gradually decrease along the flow direction of the airflow, forming a gradual channel, reducing the size of the eccentric vortex inside the fan, gradually differentiating and slowing down the impact of the airflow, so as to adapt to the change of the airflow driven by the fan when it returns from the windward surface side of the volute tongue to the inside of the air duct, so that the airflow returns smoothly to the inside of the air duct, reducing the disturbance to the operation of the fan, and making the fan airflow stable, especially when the resistance increases (that is, when the filter screen and the heat exchanger are dirty and blocked), the stability of the airflow is maintained to avoid abnormal noise caused by airflow fluctuations.

Description

Technical Field

[0001] The invention relates to the field of air conditioning equipment, and in particular to a volute tongue structure of a crossflow air duct, an air duct system and an air conditioning indoor unit. Background Art

[0002] The existing household air conditioner indoor unit includes a body, an air duct system, a heat exchanger, a fan, a swing blade and a transverse wind plate. The outdoor unit compressor compresses the refrigerant to form a low-temperature gas, which flows into the evaporator. The fan drives the airflow through the heat exchanger for heat exchange, and is discharged into the room through the swing blades, transverse plates and other outlet components, thereby achieving the purpose of regulating the indoor temperature and improving the environment. In the prior art, the gap between the fan and the volute tongue remains unchanged, the size of the eccentric vortex inside the fan is large, and the airflow stability is poor, resulting in poor air intake of the fan, resulting in a reduction in the air volume at the air outlet, uneven wind speed distribution, and inducing a "chirp" sound from the indoor unit or a panting sound that varies from time to time. This sound sounds very uncomfortable, especially at night, which greatly reduces the customer's auditory comfort. It is also one of the faults that customers complain about the most in recent years. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a volute tongue structure of a cross-flow air duct with strong air flow stability and noise reduction, an air duct system and an air conditioner indoor unit.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The first aspect of the present invention provides a volute tongue structure of a cross-flow air duct, which includes a volute tongue body, on which a windward surface and a wind guide surface are provided. The cross-flow air duct also includes a fan, and the gap between the windward surface and the outer contour of the fan gradually decreases along the airflow direction.

[0006] As a preferred solution of the volute tongue structure of the above-mentioned crossflow air duct, the windward surface and the wind guiding surface are transitioned by an arc surface, the wind guiding surface is a plane, and the windward surface is a concave curved surface.

[0007] Furthermore, the ratio of the cross-sectional arc curvature radius R1 of the concave curved surface to the circumferential radius R0 of the fan is constant.

[0008] Furthermore, a ratio of a radius of curvature R1 of a cross-section arc of the concave curved surface to a circumferential radius R0 of the fan is 0.7-1.

[0009] Furthermore, the ratio of the cross-sectional arc curvature radius R1 of the concave curved surface to the circumferential radius R0 of the fan is 0.7-0.8.

[0010] Furthermore, the minimum gap between the windward surface and the outer contour of the fan is 3 mm to 5 mm, and the maximum gap between the windward surface and the outer contour of the fan is between 1.5 and 2.5 times the minimum gap.

[0011] Furthermore, the maximum gap between the windward surface and the outer contour of the fan is between 1.8 and 2.2 times the minimum gap.

[0012] A second aspect of the present invention provides an air duct system, which includes a volute, a fan and the volute tongue structure of the cross-flow air duct as described in the above contents, the fan is installed in the volute, the volute tongue structure of the cross-flow air duct is arranged on the volute and is located on the air outlet side of the fan, and the windward surface of the volute tongue structure of the cross-flow air duct is arranged directly opposite to the fan.

[0013] As a preferred solution of the above-mentioned air duct system, the fan is a cross-flow fan, and the volute tongue structure of the cross-flow air duct is arranged parallel to the axial direction of the cross-flow fan.

[0014] A third aspect of the present invention provides an air conditioner indoor unit, which includes a body, and the air duct system described in the above items is provided in the body.

[0015] Compared with the prior art, the volute tongue structure of a crossflow air duct provided by the present invention has the following beneficial effects:

[0016] The embodiment of the present invention designs the gap between the windward surface of the volute tongue and the outer contour of the fan to gradually decrease along the flow direction of the airflow to form a gradual channel, reduce the size of the eccentric vortex inside the fan, gradually differentiate and mitigate the impact of the airflow, so as to adapt to the change of the airflow driven by the fan when it returns from the windward side of the volute tongue to the inside of the air duct, so that the airflow returns smoothly to the inside of the air duct, reduces the disturbance to the operation of the fan, and makes the fan airflow stable, especially when the resistance increases (that is, when the filter and the heat exchanger are dirty and clogged), maintains the stability of the airflow, and avoids abnormal noise caused by airflow fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a volute tongue structure of a crossflow air duct provided by an embodiment of the present invention;

[0019] Figure 2is a structural schematic diagram of an air duct system provided by an embodiment of the present invention;

[0020] In the figure, 1. volute tongue body; 11. windward surface; 12. wind guiding surface; 13. arc surface; 2. volute casing; 3. fan. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be understood that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1 As shown, an embodiment of the present invention provides a volute tongue structure of a cross-flow air duct, which includes a volute tongue body 1, on which a windward surface 11 and a wind guide surface 12 are provided. The cross-flow air duct also includes a fan 3, and a gap between the windward surface 11 and the outer contour of the fan 3 gradually decreases along the airflow direction.

[0025] Therefore, the embodiment of the present invention designs the gap between the windward surface 11 of the volute tongue and the outer contour of the fan 3 to gradually decrease along the airflow flow direction to form a gradual channel, reduce the size of the eccentric vortex inside the fan, gradually differentiate and mitigate the impact of the airflow, so as to adapt to the changes of the airflow driven by the fan when it returns from the windward surface 11 of the volute tongue to the inside of the air duct, so that the airflow returns smoothly to the inside of the air duct, reduces the disturbance to the operation of the fan, and makes the fan airflow stable, especially when the resistance increases (that is, when the filter and the heat exchanger are dirty and clogged), maintains the stability of the airflow, and avoids abnormal noise caused by airflow fluctuations.

[0026] For example, the windward surface 11 and the wind guide surface 12 are transitioned by an arc surface 13, the wind guide surface 12 is a plane, and the windward surface 11 is a concave curved surface. Such a design can make the gradual passage between the windward surface 11 of the volute tongue and the outer contour of the fan 3 smoother, and the airflow transition is more natural and smooth, thereby further improving the airflow stability of the fan.

[0027] In specific implementation, considering that when the gap between the windward surface 11 and the outer contour of the fan 3 is too large, the airflow is likely to cause an increase in return air at a low speed of the fan 3, resulting in a flow loss on the wind-guiding side; when the gap between the windward surface 11 and the outer contour of the fan 3 is too small, the eddy noise generated by the airflow will increase significantly. Therefore, the ratio of the cross-sectional arc curvature radius R1 of the concave curved surface to the circumferential radius R0 of the fan 3 is constant, and the constant ratio is selected between 0.7 and 1, preferably between 0.7 and 0.8; the minimum gap d2 between the windward surface 11 and the outer contour of the fan 3 is 3 mm to 5 mm, and the maximum gap d1 between the windward surface 11 and the outer contour of the fan 3 is between 1.5 and 2.5 times the minimum gap d2, preferably between 1.8 and 2.2 times.

[0028] like Figure 2 As shown, an air duct system provided by an embodiment of the present invention includes a volute 2, a fan 3, and the volute tongue structure of the cross-flow air duct described in the above items, wherein the fan 3 is installed in the volute 2, the volute tongue structure of the cross-flow air duct is arranged on the volute 2 and is located on the air outlet side of the fan 3, and the windward surface 11 of the volute tongue structure of the cross-flow air duct is arranged opposite to the fan 3. Among them, the fan 3 is a cross-flow fan, and the volute tongue structure of the cross-flow air duct is arranged parallel to the axial direction of the cross-flow fan. Since the air duct system includes the above-mentioned volute tongue structure of the cross-flow air duct, it has all the beneficial effects of the above-mentioned volute tongue structure of the cross-flow air duct, which are not described one by one here.

[0029] Furthermore, an embodiment of the present invention also provides an air conditioner indoor unit, which includes a body, and the air duct system described in the above items is provided in the body. Since the air conditioner indoor unit includes the above air duct system, it has all the beneficial effects of the above air duct system, which are not described one by one here. In addition, more preferably, the body is wall-mounted. That is, the air conditioner indoor unit is a wall-mounted indoor unit.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A volute tongue structure of a crossflow duct, characterized in that: It includes a volute tongue body, on which a windward surface and a wind-guiding surface are provided, and the cross-flow air duct also includes a fan, and the gap between the windward surface and the outer contour of the fan gradually decreases along the flow direction of the airflow; the windward surface and the wind-guiding surface are transitioned by an arc surface, the wind-guiding surface is a plane, and the windward surface is a concave surface; the ratio of the cross-sectional arc curvature radius R1 of the concave surface to the circumferential radius R0 of the fan is constant, and the ratio is 0.7 to 1; the minimum gap between the windward surface and the outer contour of the fan is 3 mm to 5 mm, and the maximum gap between the windward surface and the outer contour of the fan is between 1.5 and 2.5 times the minimum gap.

2. The volute tongue structure of a crossflow air duct according to claim 1, characterized in that: The ratio of the cross-sectional arc curvature radius R1 of the concave curved surface to the circumferential radius R0 of the fan is 0.7-0.

8.

3. The volute tongue structure of a crossflow air duct according to claim 1, characterized in that: The maximum gap between the windward surface and the outer contour of the fan is between 1.8 and 2.2 times the minimum gap.

4. An air duct system, characterized in that: It comprises a volute, a fan and a volute tongue structure of a cross-flow air duct as described in any one of claims 1 to 3, wherein the fan is installed in the volute, the volute tongue structure of the cross-flow air duct is arranged on the volute and located on the air outlet side of the fan, and the windward surface of the volute tongue structure of the cross-flow air duct is arranged directly opposite to the fan.

5. An air duct system according to claim 4, characterized in that: The fan is a cross-flow fan, and the volute tongue structure of the cross-flow air duct is arranged parallel to the axial direction of the cross-flow fan.

6. An air conditioner indoor unit, comprising a body, characterized in that: The air duct system as claimed in claim 4 or 5 is arranged inside the machine body.

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