Centrifugal fan and air treatment device

Abstract

The utility model discloses a centrifugal fan and an air treatment device, and belongs to the technical field of fans. The centrifugal fan comprises a volute, the volute is provided with an air outlet part forming an air outlet, the air outlet part comprises a first side wall and a second side wall which are oppositely arranged, and the first side wall corresponds to the volute tongue side; the air outlet end of the first side wall is provided with a plurality of notches arranged at intervals. A plurality of concave carding grooves are formed in the inner surface of the second side wall and extend in the airflow flowing direction. The air treatment device comprises the centrifugal fan. According to the invention, noise can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a centrifugal fan and an air treatment device. Background Art

[0002] The centrifugal fan mainly consists of a volute and an impeller. In a centrifugal fan, the gas enters the impeller from the axial direction, and the gas flow direction is changed to radial direction under the action of centrifugal force, and then discharged through the volute. Since the number of blades in the impeller is limited, there are gaps in the actual air flow. Affected by the discontinuity of the blades, the speed difference of the air flow causes an unstable pressure difference, which makes the air flows at different times at the outlet affect each other, causing unstable flow and thus causing noise problems. Utility Model Content

[0003] The present application provides a centrifugal fan and an air treatment device, which can reduce the outlet vortex volume and turbulence intensity to achieve the purpose of reducing noise.

[0004] In one aspect of the present application, a centrifugal fan is used to drive airflow, the centrifugal fan comprising: a volute, the volute having an air outlet portion forming an air outlet, the air outlet portion comprising a first side wall and a second side wall arranged opposite to each other, the first side wall corresponding to the volute tongue side;

[0005] The air outlet end of the first side wall is provided with a plurality of gaps arranged at intervals; the inner surface of the second side wall is provided with a plurality of recessed combing grooves, and the combing grooves extend along the flow direction of the airflow.

[0006] In some embodiments, multiple notches are distributed along the edge of the first side wall, and the air outlet end of the first side wall includes a first notch area, a second notch area, and a third notch area, and the second notch area is located between the first notch area and the third notch area; the notches in the second notch area are defined as first notches, and the notches in the first notch area and the third notch area are defined as second notches; the distance between two adjacent first notches is smaller than the distance between two adjacent second notches.

[0007] In some embodiments, the edge width of the second notch is greater than that of the first notch.

[0008] In some embodiments, the edge width D2 of the notch and the length H from the edge of the notch to the root of the notch satisfy: H=(0.8-1.2)D2.

[0009] In some embodiments, the air outlet end of the first side wall is sawtooth-shaped or wavy-shaped.

[0010] In some embodiments, in a cross section perpendicular to the flow direction of the airflow, the combing groove is in an arc shape.

[0011] In some embodiments, the depth of the combing groove gradually increases in a direction approaching the air outlet.

[0012] In some embodiments, the length of the combing slot is not less than 10 mm.

[0013] In some embodiments, the depth T of the combing groove and the width D5 of the combing groove satisfy: T=(0.8-1.5)D5.

[0014] In another aspect of the present application, an air handling device includes: a housing having a return air port and a supply air port;

[0015] The centrifugal fan as mentioned above is arranged in the housing and is used to drive air to flow to the air supply outlet through the return air outlet and the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 and Figure 2 shows a schematic diagram of an air conditioner according to some embodiments;

[0017] Figure 3 shows a cross-sectional view of an air conditioner according to some embodiments;

[0018] Figure 4 shows a perspective view of a volute according to some embodiments;

[0019] Figure 5 A simulation diagram of the vortex intensity and turbulence intensity at the volute outlet in the prior art is shown;

[0020] Figure 6 shows a side view of a volute according to some embodiments;

[0021] Figure 7 According to some embodiments Figure 6 Sectional view along AA direction;

[0022] Figure 8 Shows Figure 7 Enlarged view of the middle I direction;

[0023] Fig. 9 A simulation diagram showing the air flow velocity at the volute outlet;

[0024] Fig.10 According to some other embodiments Figure 6 Sectional view along AA direction;

[0025] Fig.11 According to some other embodiments Figure 6 Sectional view along AA direction;

[0026] Fig.12 According to some further embodiments, Figure 6 Sectional view along AA direction;

[0027] Fig.13 shows a side view of a volute according to some embodiments;

[0028] Fig.14 Shows Fig.13 Cross-sectional view along the BB direction;

[0029] Fig.15 Shows Fig.14 Enlarged view of the II direction.

[0030] In the above figures, 10, housing; 11, return air outlet; 12, air supply outlet; 13, partition; 20, heat exchanger;

[0031] 100. Centrifugal fan; 110. Volute; 111. Cylinder; 112. Air outlet; 1121. Outlet; 113. First side wall; 1130. Notch; 1131. First notch area; 1132. Second notch area; 1133. Third notch area; 1134. Fourth notch area; 1135. Fifth notch area; 1136. First notch; 1137. Second notch; 114. Second side wall; 1140. Combing groove; 120. Impeller. DETAILED DESCRIPTION

[0032] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0033] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 an indirect connection 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 this application can be understood according to specific circumstances.

[0036] The air treatment device of the present application may be an air conditioner, an air purifier, a fresh air blower, a total heat exchanger, etc. A fan, such as a centrifugal fan, is required in the air treatment device to drive the flow of air.

[0037] The present application mainly improves the structure of the centrifugal fan. Therefore, all air treatment devices using the centrifugal fan of the present application are within the protection scope of the present application.

[0038] The following is a detailed introduction taking the air conditioner in the air handling device as an example:

[0039] The air conditioner in this application performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0040] The compressor compresses the refrigerant gas in a low temperature and low pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0041] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0042] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0043] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0044] The air conditioner according to the embodiment of the present application may be an all-in-one unit in which an indoor unit and an outdoor unit are integrated in one housing, or may be a split unit in which the indoor unit and the outdoor unit are independently and separately installed.

[0045] The following is an introduction using the indoor unit in a split unit and the indoor unit as a duct unit as an example:

[0046] Reference Figures 1 to 3 According to an embodiment of the present application, the air treatment device includes a housing 10 in which a plurality of components constituting a refrigeration cycle are installed.

[0047] The housing 10 is in a rectangular box shape, and a return air port 11 is provided on the rear side of the housing 10, and the return air port 11 is used to allow indoor air to enter the housing 10. An air supply port 12 is provided on the front side of the housing 10, and the air supply port 12 is used to circulate the treated indoor air to the indoor space.

[0048] In an application scenario, the return air outlet 11 may be arranged corresponding to the air inlet grille on the wall, and the air supply outlet 12 is connected to the room through an air duct.

[0049] A partition 13 is provided in the middle of the shell 10, and the partition 13 divides the space in the shell 10 into a first space and a second space, wherein the return air port 11 is located on the side wall of the first space, and the supply air port 12 is located on the side wall of the second space.

[0050] The air handling device may include a fan, which is used to drive the flow of air so that the air in the indoor space enters the housing 10 from the return air port 11 and is blown out from the supply air port 12 .

[0051] The fan may be a centrifugal fan 100, the outlet end of the centrifugal fan 100 is arranged corresponding to the connecting port on the partition 13, and the centrifugal fan 100 may be arranged in the first space, and the centrifugal fan 100 blows the air in the first space to the second space.

[0052] The air treatment device may include a heat exchanger 20, which is disposed in the second space and located on the air movement path from the outlet of the centrifugal fan 100 to the air outlet 12. The heat exchanger 20 is used to absorb heat from the air blown out by the centrifugal fan 100 or transfer heat to the air.

[0053] The water receiving pan may be provided below the heat exchanger 20 to collect moisture condensed in the heat exchanger 20. The water receiving pan may be connected to a drain hose connected to the outside of the housing 10, and may discharge the condensed moisture to the outside of the housing 10.

[0054] When the air handling device is working, the centrifugal fan 100 runs, so that the air in the indoor space enters from the return air port 11, then passes through the centrifugal fan 100, flows to the heat exchanger 20, exchanges heat with the heat exchanger 20, and is sent to the indoor space through the air supply port 12.

[0055] Reference Figure 3 and Figure 4 According to an embodiment of the present application, a centrifugal fan 100 includes a volute 110 and an impeller 120 .

[0056] The impeller 120 may be connected to an output shaft of the motor to be driven by the motor to rotate.

[0057] The volute 110 includes a cylindrical portion 111. The cylindrical portion 111 is cylindrical, and the impeller 120 is disposed in the cylindrical portion 111. Air suction ports are disposed on both axial side surfaces of the cylindrical portion 111 for allowing air to flow into the volute 110.

[0058] The volute 110 includes an air outlet 112 extending outward from the circumference of the cylindrical portion 111 . The end of the air outlet 112 forms an outlet 1121 of the volute 110 . The air flow in the volute 110 is discharged from the outlet 1121 .

[0059] By simulating the outlet end of the centrifugal fan in the prior art: Figure 5 ,From the figure, it can be seen that the outlet turbulence intensity and vortex intensity of the centrifugal fan are relatively high, and the outlet air flow is unstable.

[0060] In order to solve the noise problem caused by the unstable airflow at the outlet of the centrifugal fan 100, the present application proposes the following embodiments:

[0061] In some embodiments, reference Figure 4 , Figures 6 to 8 The air outlet portion 112 includes a first side wall 113, which is formed by extending from the volute tongue of the volute 110 toward the air outlet direction. From the overall orientation of the air duct machine, the first side wall 113 is the lower side wall of the air outlet portion 112.

[0062] The outlet end of the first side wall 113 is provided with a plurality of gaps 1130 arranged at intervals. The gaps 1130 may be sawtooth-shaped, blunt petal-shaped or sinusoidal-shaped. The gaps 1130 may play a role in combing and breaking vortices, making large vortices finer, reducing the outlet vortex volume and turbulence intensity, and achieving the purpose of reducing outlet flow noise.

[0063] Taking the sawtooth-shaped notch 1130 as an example, the edge width D2 of the notch 1130 is 5-20 mm, the length H from the edge of the notch 1130 to its root is (0.8-1.2) D2, and the distance D1 between two adjacent notches 1130 is (1-1.5) D2.

[0064] Among them, H = (0.8-1.2) D2, which can ensure the combing effect of the notch on the vortex. If H is too large, the length of the notch 1130 in the airflow direction is relatively large, which cannot improve the combing effect of the notch, and the structural strength of the first side wall 113 is reduced due to the too long notch 1130. If H is too small, the length of the notch 1130 in the airflow direction is relatively small, which will reduce the combing effect of the notch 1130.

[0065] Among them, D1 = (1-1.5) D2, and this size relationship determines the density between the notches 1130, and improves the combing effect of the notches 1130 as much as possible on the basis of ensuring the strength of the edge of the first side wall 113. If D1 is too large, the arrangement of the notches 1130 is relatively sparse, and the combing effect will inevitably be weakened; if D1 is too small, the arrangement of the notches 1130 is relatively compact, and the structural strength of the serrations between the notches 1130 will be reduced, and it is easy to break.

[0066] The notch 1130 and the tip of the saw teeth are rounded to prevent the tip from hurting people.

[0067] In some embodiments, the notches 1130 are arranged non-uniformly on the first sidewall 113 .

[0068] The density of the notches 1130 corresponds to the working area at the outlet of the fan. Fig. 9 The darker the red color in the figure, the greater the flow rate. As can be seen from the figure, the flow rate in the middle of the outlet is relatively large, and the flow rates on both sides of the middle are relatively small. Therefore, in the present application, the notches 1130 in the middle of the first side wall 113 can be set to be relatively small and dense, and the denser notches 1130 are used to comb the working area.

[0069] Reference Fig.10 The edge of the first side wall 113 includes a first notch area 1131, a second notch area 1132 and a third notch area 1133. The second notch area 1132 is located in the middle and between the first notch area 1131 and the third notch area 1133.

[0070] The gap in the second gap region 1132 is defined as a first gap 1136 , and the gaps in the first gap region 1131 and the third gap region 1133 are defined as second gaps 1137 .

[0071] Among them, the distance between two adjacent first notches 1136 is d11, and the distance between two adjacent second notches 1137 is d12, and d11 is smaller than d12. Therefore, the first notches 1136 in the second notch area 1132 are relatively dense, and the second notches 1137 in the first notch area 1131 and the third notch area 1133 are arranged relatively sparsely, so that targeted combing can be achieved according to the size of the working area. The notches are relatively close in places with large working areas, which can ensure the combing effect, and the notches are relatively sparse in places with small working areas, which can improve the structural strength.

[0072] In some embodiments, reference Fig.11 , the area of ​​the second notch 1137 is larger than the area of ​​the first notch 1136 .

[0073] Specifically, the edge width d22 of the second notch 1137 is greater than the edge width d21 of the first notch 1136. In this way, the density of the first notch 1136 and the second notch 1137 can be distinguished.

[0074] The edge of the first side wall 113 may include a fourth notch region 1134 and a fifth notch region 1135. The fourth notch region 1134 and the second notch region 1132 are located on both sides of the first notch region 1131, and the fifth notch region 1135 and the second notch region 1132 are located on both sides of the third notch region 1133. That is, the fourth notch region 1134 and the fifth notch region 1135 are close to the left and right ends, respectively.

[0075] The size and arrangement of the gaps 1130 in the fourth gap region 1134 and the fifth gap region 1135 are the same as those in the second gap region 1132 .

[0076] In other embodiments, reference Fig.12 , the size of each part of the second notch 1137 is 1.2 to 2.5 times that of the first notch 1136.

[0077] The edge width of the second notch 1137 is greater than that of the first notch 1136, and the distance between two adjacent second notches 1137 is greater than the distance between two adjacent first notches 1136. The length from the edge of the second notch 1137 to its root is greater than that of the first notch 1136.

[0078] In some embodiments, reference Figures 13 to 15 The air outlet portion 112 includes a second side wall 114 , and the second side wall 114 is opposite to the first side wall 113 , that is, the first side wall 113 is located at the lower end, and the second side wall 114 is located at the upper end.

[0079] A plurality of recessed combing grooves 1140 are provided on the inner wall surface of the second side wall 114. The length direction of the combing grooves 1140 is consistent with the flow direction of the airflow.

[0080] The combing groove 1140 can comb the airflow at the upper part of the outlet of the volute 110 to improve the stability of the outlet airflow and reduce the airflow noise.

[0081] The combing groove 1140 may be arc-shaped in a cross section perpendicular to the airflow direction. The length D3 of the combing groove 1140 is not less than 10 mm to ensure the combing effect of the combing groove 1140 on the airflow. If the combing groove 1140 is too short, the combing effect will be reduced. In some examples, D3 = 20 to 80 mm.

[0082] The groove width D5 of the combing groove 1140 is 1-5 mm, and the groove interval D4 is 1-10 mm. The width of the combing groove 1140 is set relatively narrow, and the interval is set relatively dense, which can improve the combing effect.

[0083] In some embodiments, the depth T of the combing groove 1140 gradually increases along the direction of the airflow. As a result, the depth of the inner end of the combing groove 1140 is relatively shallow, and the airflow can smoothly flow into the combing groove 1140. In addition, the combing groove 1140 is relatively deep only at the outlet side, which can minimize the influence of the combing groove 1140 on the structural strength of the second side wall 114.

[0084] The depth T of the combing groove 1140 is (0.8-1.5) D5, which can improve the combing effect of the airflow as much as possible while ensuring the structural strength. If the depth is too large, the structural strength of the second side wall 114 will be affected, and if the depth is too small, the combing effect will not be achieved.

[0085] In some embodiments, the combing grooves 1140 can also be arranged in a sparse and dense manner according to the outlet working area, just like the notches 1130. Fig. 9 As can be seen from the figure, the working area at the top of the outlet of the volute 110 is relatively long in the left-right direction, so the combing grooves 1140 can be evenly arranged.

[0086] In other embodiments, the air flow velocity at the left and right ends of the top of the outlet is relatively low, and the combing grooves 1140 at the left and right ends can be arranged more sparsely, that is, the intervals between the combing grooves 1140 can be set larger.

[0087] In the present application, a plurality of spaced-apart notches 1130 are provided on the first side wall 113 corresponding to the volute tongue side at the outlet end of the volute 110. The notches 1130 can comb the vortex and refine the large vortex groups, thereby making the outlet airflow more stable and achieving the purpose of reducing flow noise.

[0088] In the present application, by providing a plurality of combing grooves 1140 arranged at intervals on the inner side of the second side wall 114 at the outlet end of the volute 110 , the outlet airflow can be combed and the flow noise can be reduced.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0090] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A centrifugal fan for driving airflow, characterized in that: include: A volute, wherein the volute has an air outlet portion forming an air outlet, wherein the air outlet portion includes a first side wall and a second side wall arranged opposite to each other, wherein the first side wall corresponds to a volute tongue side; The air outlet end of the first side wall is provided with a plurality of gaps arranged at intervals; the inner surface of the second side wall is provided with a plurality of recessed combing grooves, and the combing grooves extend along the airflow direction; The plurality of notches are distributed along the edge of the first side wall, the air outlet end of the first side wall includes a first notch area, a second notch area and a third notch area, and the second notch area is located between the first notch area and the third notch area; The gap in the second gap area is defined as a first gap, and the gaps in the first gap area and the third gap area are defined as second gaps; and the distance between two adjacent first gaps is smaller than the distance between two adjacent second gaps.

2. The centrifugal fan according to claim 1, characterized in that: The edge width of the second notch is greater than that of the first notch.

3. The centrifugal fan according to claim 1, characterized in that: The edge width D2 of the notch and the length H from the edge of the notch to the root of the notch satisfy: H=(0.8-1.2)D2.

4. The centrifugal fan according to claim 1, characterized in that: The air outlet end of the first side wall is sawtooth-shaped or wavy-shaped.

5. The centrifugal fan according to claim 1, characterized in that: In a cross section perpendicular to the airflow direction, the combing groove is in an arc shape.

6. The centrifugal fan according to claim 1, characterized in that: In the direction approaching the air outlet, the depth of the combing groove gradually increases.

7. The centrifugal fan according to claim 1, characterized in that: The length of the combing groove is not less than 10 mm.

8. The centrifugal fan according to claim 1, characterized in that: The depth T of the combing groove and the width D5 of the combing groove satisfy: T=(0.8-1.5)D5.

9. An air treatment device, characterized in that: include: A housing having an air return port and an air supply port; The centrifugal fan according to any one of claims 1 to 8 is arranged in the housing and is used to drive air through the return air port and the centrifugal fan to flow toward the supply air port.

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