Cross-flow air duct structure and cabinet type air conditioner indoor unit

Abstract

The invention discloses a cross-flow air duct structure and a cabinet type air conditioner indoor unit in the technical field of air conditioner products. The cross-flow air duct structure comprises a volute tongue structure and a rear volute structure, the portions, where airflow passes through, of the two sides of the rear volute structure are partition flow guide structures, and the diameter of the cross-flow fan is D. The cross-flow fan is characterized by further comprising a plurality of second flow guide frames, and the side, close to an inlet of the cross-flow air duct, of each second flow guide frame serves as the front and the side, away from the inlet of the cross-flow air duct, of each second flow guide frame. The second flow guide frame is arranged in the front area of the side, away from the cross-flow fan, of the division flow guide structure, the extending direction of the second flow guide frame is consistent with the axis direction of the cross-flow fan, the upper end and the lower end of the second flow guide frame in the height direction are connected with the side, away from the cross-flow fan, of the division flow guide structure, and the upper end is fluctuant. The second flow guide frame is additionally arranged, so that in the process that airflow enters the cross-flow fan along the rear volute structure, the flow velocity of the airflow is scattered under the fluctuating action, the problem that energy is concentrated due to stable flow velocity is solved, and noise in a certain range of an air duct is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning products, and in particular to a cross-flow duct structure and a cabinet-type air-conditioning indoor unit. Background Art

[0002] In cabinet air conditioners, crossflow fans are generally multi-wing crossflow fans, which are composed of multiple impellers connected in sequence along the axis of rotation. The diameter of the crossflow fan is much smaller than the axial length. The air duct structure of a crossflow cabinet air conditioner is a crossflow air duct system, including a volute structure and a rear volute structure. The overall shape of the volute structure and the rear volute structure usually remains unchanged along the axis of the crossflow fan.

[0003] In actual work, when the crossflow fan speed is high, the indoor unit of the air conditioner often has abnormal noise in the middle and high frequencies, which is mostly related to the blade frequency noise. In order to solve this abnormal noise, the existing technical means mainly include changing the volute tongue structure to a sawtooth or wave type, connecting the multiple sub-impellers of the crossflow fan according to a certain regular distribution, and setting wave steps on the rear volute curved surface along the rotation axis direction, etc., by taking advantage of the fact that the length of the crossflow fan is much larger than the diameter.

[0004] In the patent applications with application numbers: 202420665174.9 and 202420665223.9, a technical solution of setting a U-shaped guide plate or a V-shaped guide plate on the outside of the split guide structure is applied to reduce noise. However, in this solution, the guide plate needs to be additionally provided relative to the split guide structure, and it needs to be relatively adaptable and fixed, which makes the implementation more complicated. Summary of the invention

[0005] In order to overcome the technical problem that the existing cabinet-type air-conditioning indoor unit is prone to high-frequency noise, the present invention provides a cross-flow duct structure and a cabinet-type air-conditioning indoor unit.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A crossflow duct structure, a crossflow fan is arranged in the crossflow duct structure, the crossflow duct structure includes a volute tongue structure and a rear volute structure, the parts on both sides of the rear volute structure through which air flows are divided and guided structures, the diameter of the crossflow fan is D, and it is characterized in that it also includes a plurality of second guide frames, with the side close to the crossflow duct inlet as the front and the side away from the crossflow duct inlet as the rear, the second guide frame is arranged in the front area of ​​the side of the divided guide structure away from the crossflow fan, the extension direction of the second guide frame is consistent with the axial direction of the crossflow fan, the upper and lower ends of the second guide frame in the height direction are connected to the side of the divided guide structure away from the crossflow fan, and the upper end is arranged in an undulating shape.

[0008] In the present application, a second guide frame is added so that when the airflow enters the cross-flow fan along the rear volute structure, the airflow velocity is dispersed under the action of the undulating shape, thereby avoiding the problem of energy concentration due to stable flow velocity, thereby reducing the noise in a certain range of the air duct.

[0009] In some embodiments, the front end of the split guide structure is also configured to be undulating to form a first guide frame.

[0010] In this embodiment, the axis of the cross-flow fan at the front edge of the split guide structure remains unchanged, and the airflow breaking effect can be enhanced under the action of multiple undulations.

[0011] In some embodiments, the undulations of the first guide frame are irregularly distributed, or the undulations of the second guide frame are irregularly distributed, or the wave crests of the first guide frame and the second guide frame are staggered.

[0012] In this embodiment, the above configuration is used to enhance the airflow breaking effect.

[0013] In some embodiments, on a section perpendicular to the axis of the crossflow blower, in a direction from front to back, an angle between the first guide frame and the frontmost second guide frame is 90°-120°.

[0014] In some embodiments, the distance between the wave crest and the wave trough of the first guide frame and the distance between the wave crest and the wave trough of the second guide frame are both no greater than 0.08D.

[0015] In some embodiments, on a section perpendicular to the axis of the crossflow blower, a distance between a lower end of the frontmost second guide frame and a trough of the first guide frame is 0.01D-0.04D.

[0016] In some embodiments, the distance between two adjacent wave peaks of the second guide frame is no greater than 0.1D.

[0017] In some embodiments, the second guide frames are arranged in parallel in a plurality, and on a section perpendicular to the axis of the crossflow blower, a distance between adjacent second guide frames is 0.03D-0.06D.

[0018] In some embodiments, the maximum height of the second guide frame is no greater than 0.12D.

[0019] The above parameters are preferably selected to provide a good noise reduction effect.

[0020] The present invention also provides a cabinet-type air-conditioning indoor unit, comprising the cross-flow air duct structure described in any one of the above embodiments.

[0021] The beneficial effects of the present invention are:

[0022] By adding a second guide frame, the airflow velocity is dispersed under the action of the undulating shape when the airflow enters the cross-flow fan along the rear volute structure, thereby avoiding the problem of energy concentration due to stable flow velocity, thereby reducing the noise in a certain range of the air duct; this technical solution is equivalent to directly adding a reinforcing rib type on the basis of the original parts, with a simple structure and easy manufacturing and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the internal structure of a cabinet-type air-conditioning indoor unit provided by the present invention;

[0024] Figure 2 for Figure 1 Three-dimensional schematic diagram of the mid-rear volute structure;

[0025] Figure 3 for Figure 1 A cross-sectional schematic diagram of a central cabinet air conditioner indoor unit;

[0026] Figure 4 for Figure 3 A magnified view of middle;

[0027] Figure 5 This is a structural schematic diagram of another implementation of the guide plate in the embodiment;

[0028] Figure 6 It is a schematic diagram of the shape of the guide frame in the present invention.

[0029] Marked in the figure are the air conditioner indoor unit casing 1, air inlet 2, cross-flow fan 3, heat exchanger 4, rear volute structure 5, split guide structure 5-1, air guide frame 5-1-1, volute tongue structure 6, first guide frame BL1, second guide frame BL2, inner guide flow channel surface NS, and outer guide flow channel surface WS. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Embodiment 1

[0033] like Figure 1-Figure 4 As shown, the present invention provides a cabinet type air conditioner indoor unit.

[0034] The cabinet air conditioner indoor unit of the present invention comprises: a crossflow duct structure, an air conditioner indoor unit casing 1 and a heat exchanger 4, the heat exchanger 4 is arranged in the crossflow duct structure, the crossflow duct structure includes a volute tongue structure 6 and a rear volute structure 5, the crossflow fan 3 is arranged in the crossflow duct structure, the diameter of the crossflow fan 3 is D, and the length of the crossflow fan 3 along the axial direction is L.

[0035] A relatively sealed internal space is formed between the crossflow duct structure and the heat exchanger 4, the air conditioner indoor unit housing 1 and the heat exchanger 4, so as to ensure that the airflow enters the heat exchanger 4 from the indoor unit air inlet 2, then enters the inlet of the crossflow duct structure, and is discharged to the outside along the outlet of the crossflow duct structure and the indoor unit outlet under the action of the crossflow fan 3.

[0036] The inlet of the aforementioned cross-flow duct structure, namely the volute tongue structure 6 and the rear volute structure 5, is close to the edge of the heat exchanger 4; the outlet of the aforementioned cross-flow duct structure, namely the volute tongue structure 6 and the rear volute structure 5, is close to the edge of the indoor unit air outlet.

[0037] The internal area between the heat exchanger 4 and the inlet of the cross-flow duct structure is assembled by the heat exchanger 4, the volute tongue structure 6 and the rear volute structure 5 to form a sealed area to ensure that the airflow enters the inlet of the cross-flow duct structure from the heat exchanger 4.

[0038] Among them, the parts on both sides of the wall of the rear volute structure 5 through which air flows are called the divided guide structure 5-1 of the rear volute structure 5; the side of the divided guide structure 5-1 close to the crossflow fan 3 is the inner guide flow path surface NS; the side of the divided guide structure 5-1 away from the crossflow fan 3 is the outer guide flow path surface WS; the front end air guide frame 5-1-1 of the divided guide structure 5-1, that is, the intersection of the outer guide flow path surface WS and the inner guide flow path surface NS.

[0039] In the present application, a plurality of second guide frames BL2 are added, with the side close to the inlet of the crossflow duct as the front and the side away from the inlet of the crossflow duct as the back. The second guide frame BL2 is arranged on the side of the split guide structure 5-1 away from the crossflow fan 3, that is, on the outer guide flow channel surface WS. Specifically, it is arranged in the front area of ​​the side of the split guide structure 5-1 away from the crossflow fan 3; the extension direction of the second guide frame BL2 is consistent with the axial direction of the crossflow fan 3, the upper and lower ends of the second guide frame BL2 in the height direction are connected to the outer guide flow channel surface WS, and the upper end is arranged in an undulating shape.

[0040] In the present application, a second guide frame BL2 is added so that when the airflow enters the cross-flow fan 3 along the rear volute structure 5, the airflow velocity is dispersed under the action of the undulating shape, thereby avoiding the problem of energy concentration due to stable flow velocity, thereby reducing the noise in a certain range of the air duct.

[0041] In this embodiment, the front end air guide frame 5-1-1 of the split air guide structure 5-1 is also set to be undulating to form a first air guide frame BL1, and the undulation is generally wave undulation or sawtooth undulation. The undulation extends in the same direction as the axis of the crossflow fan 3. With respect to the front end edge of the split air guide structure 5-1 remaining unchanged along the axis of the crossflow fan 3, the airflow breaking effect can be enhanced under the action of the multiple undulations of the first guide frame BL1 and the second guide frame BL2.

[0042] Conventional fluctuations such as Figure 6 As shown in BK1 and BK2, it is obvious that the location of the wave crest or wave trough can be a point or a line segment; the wave crest or wave trough can be irregularly distributed to provide more airflow entry forms. From the perspective of the normal direction of the outer guide flow channel surface WS close to the front wind guide frame 5-1-1, the highest and lowest points of the undulating shape correspond to the wave crest and wave trough of the undulating shape.

[0043] like Figure 6 As shown in BK1, the undulations of the second guide frame BL2 or the first guide frame BL1 may not be regularly distributed, specifically including irregular appearance of wave crests and wave troughs in the undulations, or irregular shapes of wave crests and wave troughs in the undulations.

[0044] Furthermore, the wave crests of the first guide frame BL1 and the second guide frame BL2 are staggered. The irregular distribution of the undulations or the staggered distribution here can enhance the effect of airflow dispersion.

[0045] In this embodiment, on a section perpendicular to the axis of the cross-flow fan 3, in the direction from front to back, the angle a between the first guide frame BL1 and the second guide frame BL2 is 90°-120°; the distance between the wave crest and the wave trough of the first guide frame BL1 and the distance between the wave crest and the wave trough of the second guide frame BL2 are both no greater than 0.08D; on a section perpendicular to the axis of the cross-flow fan 3, the distance between the lower end of the second guide frame BL2 and the wave trough of the first guide frame BL1 is 0.01D-0.04D; the distance between two adjacent wave crests of the second guide frame BL2 is no greater than 0.1D; the maximum height of the second guide frame BL2 is no greater than 0.12D. The above parameters are preferred to provide a good noise reduction effect.

[0046] Embodiment 2

[0047] like Figure 5 As shown, the number of the second guide frames BL2 disclosed in this embodiment is different from that in the first embodiment.

[0048] In this embodiment, two second guide frames BL2 are provided in parallel. Preferably, each second guide frame BL2 should be long enough, for example, matching the length L of the crossflow fan 3 to cover the entire air inlet area.

[0049] In this embodiment, on a section perpendicular to the axis of the cross-flow fan 3, in the direction from front to back, the angle a between the first guide frame BL1 and the second guide frame BL2 at the front is 90°-120°; the distance between the wave crest and the wave trough of the first guide frame BL1 and the distance between the wave crest and the wave trough of the second guide frame BL2 are both no greater than 0.08D; on a section perpendicular to the axis of the cross-flow fan 3, the distance between the lower end of the second guide frame BL2 at the front and the wave trough of the first guide frame BL1 is 0.01D-0.04D; the distance between two adjacent wave crests of the second guide frame BL2 is no greater than 0.1D; the maximum height of the second guide frame BL2 is no greater than 0.12D. The above parameters are preferred to provide a good noise reduction effect.

[0050] Preferably, on a section perpendicular to the axis of the crossflow fan 3 , the distance between adjacent second guide frames BL2 is 0.03D-0.06D.

[0051] Based on the first embodiment, alternatively, the undulating shapes of the plurality of second guide frames BL2 may not be regularly distributed, specifically including irregular appearance of wave crests and wave troughs in the undulating shapes, or irregular shapes of wave crests and wave troughs in the undulating shapes.

[0052] Furthermore, the wave crests of the plurality of second guide frames BL2 may be staggered. The irregular distribution of the undulations or the staggered distribution here can both enhance the airflow dispersion effect.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crossflow air duct structure, wherein the crossflow fan (3) is arranged in the crossflow air duct structure, the crossflow air duct structure comprises a volute tongue structure (6) and a rear volute structure (5), the parts on both sides of the rear volute structure (5) through which air flows are divided into flow guide structures (5-1), the crossflow fan (3) has a diameter of D, and is characterized in that: It also comprises a plurality of second guide frames (BL2), with the side close to the inlet of the crossflow air duct as the front and the side away from the inlet of the crossflow air duct as the rear. The second guide frames (BL2) are arranged in the front area of ​​the side of the split guide structure (5-1) away from the crossflow fan (3). The extension direction of the second guide frame (BL2) is consistent with the axial direction of the crossflow fan (3). The upper and lower ends of the second guide frame (BL2) in the height direction are connected to the side of the split guide structure (5-1) away from the crossflow fan (3), and the upper end is arranged in an undulating shape.

2. The cross-flow air duct structure according to claim 1, characterized in that: The front end of the split flow-guiding structure (5-1) is also arranged in an undulating shape to form a first flow-guiding frame (BL1).

3. The cross-flow air duct structure according to claim 2, characterized in that: The undulations of the first guide frame (BL1) are irregularly distributed, or the undulations of the second guide frame (BL2) are irregularly distributed, or the wave crests of the first guide frame (BL1) and the second guide frame (BL2) are staggered.

4. The cross-flow air duct structure according to claim 2, characterized in that On a section perpendicular to the axis of the crossflow fan (3), in a direction from front to back, the angle between the first flow guide frame (BL1) and the frontmost second flow guide frame (BL2) is 90°-120°.

5. The crossflow air duct structure according to any one of claims 2 to 4, characterized in that: The distance between the wave crest and the wave trough of the first flow guiding frame (BL1) and the distance between the wave crest and the wave trough of the second flow guiding frame (BL2) are both no greater than 0.08D.

6. The crossflow duct structure according to any one of claims 2 to 4, characterized in that On a section perpendicular to the axis of the cross-flow fan (3), the distance between the lower end of the frontmost second guide frame (BL2) and the wave valley of the first guide frame (BL1) is 0.01D-0.04D.

7. The cross-flow air duct structure according to claim 1, characterized in that: The distance between two adjacent wave crests of the second guide frame (BL2) is no greater than 0.1D.

8. The cross-flow air duct structure according to claim 1, characterized in that: The second flow guide frames (BL2) are arranged in parallel in plurality, and on a section perpendicular to the axis of the cross-flow fan (3), the distance between adjacent second flow guide frames (BL2) is 0.03D-0.06D.

9. The cross-flow air duct structure according to claim 1, characterized in that: The maximum height of the second guide frame (BL2) is not higher than 0.12D.

10. A cabinet-type air conditioner indoor unit, characterized in that: It comprises the cross-flow air duct structure as described in any one of claims 1 to 9.

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