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

Abstract

The utility model 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 utility model relates to the technical field of air-conditioning products, in particular to a cross-flow duct structure and a cabinet-type air-conditioning indoor unit. Background Art

[0002] In cabinet air conditioners, the crossflow fan is typically a multi-blade crossflow fan, consisting of multiple impellers connected in series along the axis of rotation. The fan's diameter is significantly smaller than its axial length. The air duct structure of a crossflow cabinet air conditioner is a crossflow duct system, consisting of a volute and a rear volute. These structures typically maintain their overall shape along the fan's axis of rotation.

[0003] In practice, when a crossflow fan rotates at high speeds, the indoor unit of an air conditioner often experiences abnormal mid-to-high frequency noise. This noise is often related to blade-frequency noise. To address this noise, existing technologies utilize the characteristic of a crossflow fan that its length is much greater than its diameter. These include modifying the volute tongue structure to a sawtooth or wavy pattern, connecting the fan's multiple impellers in a regular pattern, and adding wavy steps to the rear volute's curved surface along the axis of rotation.

[0004] Patent applications numbered 202420665174.9 and 202420665223.9 claim a technical solution that uses U-shaped or V-shaped guide plates on the outside of a split flow guide structure to reduce noise. However, this solution requires the guide plates to be installed separately from the split flow guide structure and to be relatively adaptable and fixed, making implementation complex. Utility Model Content

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

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A cross-flow duct structure, a cross-flow fan is arranged in the cross-flow duct structure, the cross-flow duct structure includes a volute 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 cross-flow fan is D, and it is characterized in that it also includes a plurality of second guide frames, with the side close to the cross-flow duct inlet as the front and the side away from the cross-flow 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 cross-flow fan, the extension direction of the second guide frame is consistent with the axial direction of the cross-flow 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 cross-flow fan, and the upper end is arranged in an undulating shape.

[0008] In this 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 remains unchanged relative to the front edge of the segmented guide structure, 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 cross-flow blower, 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 cross-flow 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 crests of the second guide frame is no greater than 0.1D.

[0017] In some embodiments, the second guide frames are provided in parallel in a plurality, and on a section perpendicular to the axis of the cross-flow 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 preferred 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 utility model 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 the cabinet-type air-conditioning indoor unit provided by the present utility model;

[0024] Figure 2 for Figure 1 3D schematic diagram of the mid-rear volute structure;

[0025] Figure 3 for Figure 1 Schematic cross-section of the indoor unit of a cabinet-type air conditioner;

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

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

[0028] Figure 6 This is a schematic diagram of the shape of the guide frame in the utility model.

[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 path surface NS, and outer guide flow path surface WS. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to 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 intended to limit the present invention.

[0032] Example 1

[0033] like Figures 1-4 As shown, the utility model provides a cabinet-type air-conditioning indoor unit.

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

[0035] A relatively sealed internal space is formed between the crossflow duct structure, the heat exchanger 4, and the air conditioner indoor unit housing 1 and the heat exchanger 4. This ensures that 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 through 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 cross-flow duct structure, i.e., 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 cross-flow duct structure, i.e., 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 part where air flows through both sides of the wall of the rear volute structure 5 is 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 cross-flow fan 3 is the inner guide flow path surface NS; the side of the divided guide structure 5-1 away from the cross-flow 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 this application, several second guide frames BL2 are added, with the side closest to the crossflow duct inlet as the front and the side furthest from the crossflow duct inlet as the rear. These second guide frames BL2 are arranged on the side of the split guide structure 5-1 away from the crossflow fan 3, i.e., on the outer guide flow path surface WS. Specifically, they are arranged in the forward area of ​​the side of the split guide structure 5-1 away from the crossflow fan 3. The second guide frames BL2 extend in the same direction as the axis of the crossflow fan 3. The upper and lower ends of the second guide frames BL2 are connected to the outer guide flow path surface WS in the height direction, and the upper end is configured 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 air guide frame 5-1-1 of the segmented air guide structure 5-1 is also configured in an undulating pattern, forming a first air guide frame BL1. The undulations are typically wave-like or sawtooth-like. The undulations extend in the same direction as the axis of the crossflow fan 3. While the front edge of the segmented air guide structure 5-1 remains constant along the axis of the crossflow fan 3, the multiple undulations of the first and second air guide frames BL1 and BL2 enhance the airflow dispersion effect.

[0042] Regular undulations such as Figure 6 As shown in BK1 and BK2, it is obvious that the peak or trough can be a point or a line segment; the peaks or troughs can be irregularly distributed to provide more airflow patterns. From the perspective of the normal direction of the outer guide flow path surface WS near the front air guide frame 5-1-1, the highest and lowest points of the undulating shape correspond to the peaks and troughs 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 crests and troughs in the undulations, or irregular shapes of crests and 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 breaking up the airflow.

[0045] In this embodiment, on a section perpendicular to the axis of the cross-flow blower 3, 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 peaks and troughs of the first guide frame BL1 and the distance between the peaks and troughs of the second guide frame BL2 are both no greater than 0.08D; on a section perpendicular to the axis of the cross-flow blower 3, the distance between the lower end of the second guide frame BL2 and the trough of the first guide frame BL1 is 0.01D-0.04D; the distance between two adjacent peaks of the second guide frame BL2 is no greater than 0.1D; and the maximum height of the second guide frame BL2 is no greater than 0.12D. These parameters are preferred to provide a good noise reduction effect.

[0046] Example 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 parallel second guide frames BL2 are provided. Preferably, each second guide frame BL2 should be long enough, for example, matching the length L of the cross-flow fan 3 to cover the entire air inlet area.

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

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

[0051] Based on the first embodiment, alternatively, the undulations 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 undulations, or irregular shapes of wave crests and wave troughs in the undulations.

[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 replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

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

2. The cross-flow air duct structure according to claim 1, wherein: 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, wherein: 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, wherein On a section perpendicular to the axis of the cross-flow fan (3), in the 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 cross-flow 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 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.

6. The cross-flow air duct structure according to any one of claims 2 to 4, wherein 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 trough of the first guide frame (BL1) is 0.01D-0.04D.

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

10. Cabinet type air conditioner indoor unit, characterized by: It comprises the cross-flow air duct structure according to any one of claims 1 to 9.

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