Stationary blade diffusion structure of fan, fan comprising stationary blade diffusion structure and household appliance comprising stationary blade diffusion structure

Abstract

The utility model provides a stationary blade diffusion structure of a fan, the fan comprising the stationary blade diffusion structure and a household appliance comprising the stationary blade diffusion structure, the stationary blade diffusion structure comprises a stationary blade casing, a first-stage stationary blade assembly and at least one second-stage stationary blade assembly, and the first-stage stationary blade assembly comprises a first-stage stationary blade hub and a plurality of first-stage stationary blades; the first-stage stationary blade comprises a fixed blade and a telescopic blade, one end of the fixed blade is fixed on the first-stage stationary blade hub, and the other end of the fixed blade is telescopically connected to the telescopic blade; the outer end face of the telescopic blade is matched with the outline of the inner wall of the stationary blade casing, when the telescopic blade is contracted, the outer end face and the inner wall of the stationary blade casing are arranged in a spaced mode, and when the telescopic blade stretches out, the outer end face abuts against the inner wall of the stationary blade casing. According to the stationary blade diffusion structure of the fan, the fan comprising the stationary blade diffusion structure and the household appliance comprising the stationary blade diffusion structure, the assembly requirement of the first-stage stationary blade is met, a gap between the first-stage stationary blade and the stationary blade casing is eliminated, the flowing energy loss of airflow is reduced, the working efficiency of the fan is improved, and noise is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of household appliances, especially to a fan static vane diffuser structure and a fan and household appliance equipment comprising the same. BACKGROUND

[0002] The fan used by the range hood is generally a multi-wing centrifugal fan, but its efficiency is low. With the development of technology, the axial flow or multi-stage axial flow fan is gradually applied to the range hood fan, and its efficiency is much higher than that of the multi-wing centrifugal fan. For example, the patents with the patent application numbers CN202310968785.0 and CN202410061836.6 all use this type of fan as the main fan. The motor of these fans drives the rotating impeller, the airflow is sucked into the fan inlet, obtains a large kinetic energy after passing through the high-speed rotating impeller, and then flows into the axial diffuser from the outlet of the impeller along the radial direction of the impeller. To ensure the diffuser effect, the diffuser is generally composed of two stages of static vanes, and then the airflow flows out of the casing and is discharged to the public flue with oil smoke.

[0003] The structure of the diffuser generally includes a static vane casing and two-stage static vane assemblies arranged in the static vane casing. Each stage of static vane assemblies includes a static vane hub at the center and a plurality of static vanes arranged at intervals on the circumferential surface of the static vane hub. Each static vane is arranged obliquely on the circumferential surface of the static vane hub. The airflow flowing into the diffuser in the axial direction is guided to flow through the gaps between the static vanes to form an axial flow. To ensure the diffuser effect, the first-stage static vanes and the adjacent static vanes generally have a partial overlap in the axial direction. Therefore, the first-stage static vanes cannot be extracted in the axial direction (i.e., cannot be extracted from the mold in the axial direction), and thus the first-stage static vanes are generally not provided with a static vane casing. The first-stage static vanes are assembled to the second-stage static vanes in the axial direction. If the outer diameter of the first-stage static vanes is D1 and the inner diameter of the static vane casing is D2, the condition D1 < D2 generally needs to be met to ensure that the first-stage static vanes can be assembled into the casing.

[0004] However, the function of the static vane diffuser is to convert the airflow with tangential rotational flow from the outlet of the impeller to the axial airflow. The tangential airflow will cause energy loss and generate aerodynamic noise. Since there is a gap between the static vanes and the static vane casing, the airflow with tangential velocity in the gap between the static vanes cannot be converted to the axial airflow, resulting in a large energy loss and an increase in noise. In addition, the airflow in the gap between the static vanes is a high-speed airflow, which will generate a large amount of noise in the gap, resulting in a large noise of the fan and poor sound quality. SUMMARY

[0005] The utility model wants to solve the technical problem of overcoming the defects of low efficiency and loud noise of the fan in the prior art, and provides a static blade pressure expansion structure of a fan, a fan comprising the same and a household appliance.

[0006] The utility model solves the above technical problem through the following technical scheme:

[0007] A static blade pressure expansion structure of a fan is connected to a moving impeller in the fan, the static blade pressure expansion structure comprises a static blade casing, a first-stage static blade assembly and at least one second-stage static blade assembly arranged in the static blade casing in sequence along the flow direction of airflow, the first-stage static blade assembly comprises a first-stage static blade hub and a plurality of first-stage static blades arranged on the circumferential surface of the first-stage static blade hub at intervals;

[0008] The first-stage static blade comprises a fixed blade and a telescopic blade, one end of the fixed blade is fixed to the first-stage static blade hub along the radial direction of the first-stage static blade hub, and the other end of the fixed blade is telescopically connected to the telescopic blade;

[0009] The outer end surface of the telescopic blade towards the static blade casing is matched with the inner wall contour of the static blade casing, when the telescopic blade is retracted, the outer end surface is arranged at intervals from the inner wall of the static blade casing, and when the telescopic blade is extended, the outer end surface abuts against the inner wall of the static blade casing.

[0010] In the scheme, in the design of the first-stage static blade of the static blade pressure expansion structure of the fan, the telescopic blade and the fixed blade are telescopically connected, when the telescopic blade is retracted, there is a gap between the first-stage static blade and the static blade casing, which meets the requirement of installing the first-stage static blade in the axial direction (the axial direction is the axial direction of the static blade hub), and when the telescopic blade is extended, the first-stage static blade abuts against the inner wall of the static blade casing, the gap is eliminated, the flow energy loss of the airflow is reduced, the working efficiency of the fan is improved, and the noise is reduced. The outer end surface of the telescopic blade towards the static blade casing is matched with the inner wall contour of the static blade casing, so that the outer end surface of the telescopic blade is attached to the inner wall of the static blade casing, and the gap is eliminated.

[0011] Preferably, the fixed blade and the telescopic blade are elastically connected, when the telescopic blade is not elastically compressed and is completely extended, the total length of the fixed blade and the telescopic blade along the radial direction is greater than the distance between the outer wall of the first-stage static blade hub and the inner wall of the static blade casing.

[0012] In the scheme, the elastic connection mode is adopted between the fixed blade and the retractable blade to realize the retractable connection. Compared with other retractable modes, the elastic retractable mode is more flexible, and the elastic force can ensure that the outer end surface of the retractable blade is tightly attached to the inner wall of the static blade casing, thereby improving the reliability of the attachment. When the retractable blade is not compressed by the elasticity and is completely extended, through the above setting, that is, the total length of the fixed blade and the retractable blade in the radial direction is greater than the distance between the outer wall of the primary static blade hub and the inner wall of the static blade casing, the retractable blade is extended by a sufficient length, and the inner wall of the static blade casing can be abutted.

[0013] Preferably, the fixed blade comprises a hollow structure, at least one elastic member is arranged in the hollow structure, and at least part of the retractable blade is arranged in the hollow structure. The two ends of the elastic member in the radial direction are respectively abutted against the inner wall of the fixed blade in the hollow structure and the retractable blade.

[0014] In the scheme, by arranging the elastic member and at least part of the retractable blade in the hollow structure, the retractable movement space of the retractable blade is limited in the hollow structure and is not disturbed by the outside, which is beneficial to improve the stability of the retractable movement.

[0015] Preferably, the elastic member is a spring.

[0016] In the scheme, the elastic member is a spring, which has a simple structure and reliable elastic force. According to different retractable length requirements, different materials and lengths of springs can be selected flexibly.

[0017] Preferably, along the axial direction of the primary static blade hub, the retractable blade is attached to the inner wall of the fixed blade.

[0018] In the scheme, through the above setting, the upper and lower surfaces of the retractable blade in the axial direction of the primary static blade hub are attached to the inner wall of the fixed blade, and the gap is small, which reduces the shaking in the retractable movement process and further improves the stability of the retractable blade in the retractable movement process.

[0019] Preferably, a plurality of elastic members are arranged in the hollow structure, and the plurality of elastic members are arranged at intervals in the circumferential direction of the fixed blade.

[0020] In the scheme, through the above setting, the force at each contact position of the retractable blade and the inner wall of the static blade casing in the circumferential direction is uniform, which avoids the shaking of the retractable blade under the impact of high-speed airflow, thereby avoiding the generation of additional noise.

[0021] Preferably, the fixed blade and the primary static blade hub are integrally formed.

[0022] In the scheme, the fixed blade and the first-stage vane hub are integrally formed, reliably ensuring no gap between the fixed blade and the first-stage vane hub, and reducing assembly steps and assembly difficulty.

[0023] Preferably, the second-stage vane assembly comprises a second-stage vane hub and a plurality of second-stage vanes arranged on the circumferential surface of the second-stage vane hub.

[0024] The second-stage vane hub, the second-stage vanes and the vane casing are integrally formed.

[0025] In the scheme, the second-stage vane hub, the second-stage vanes and the vane casing are integrally formed, reliably ensuring no gap between the two ends of the second-stage vanes in the radial direction and the second-stage vane hub and the vane casing, further improving fan working efficiency and reducing noise, and reducing assembly steps and assembly difficulty.

[0026] A fan, wherein a moving blade wheel and a vane diffuser structure of the fan are installed in the fan, and the vane diffuser structure is connected to the moving blade wheel.

[0027] In the scheme, the fan meets the assembly requirements of the first-stage vanes and eliminates the gap between the first-stage vanes and the vane casing by using the vane diffuser structure, reduces airflow energy loss, improves fan working efficiency and reduces noise.

[0028] A household appliance, wherein the household appliance comprises the fan.

[0029] In the scheme, the household appliance reduces airflow energy loss, improves fan working efficiency and reduces noise by using the fan.

[0030] The positive progress effect of the fan vane diffuser structure and the fan and the household appliance comprising the fan vane diffuser structure lies in that the fan vane diffuser structure meets the assembly requirements of the first-stage vanes and eliminates the gap between the first-stage vanes and the vane casing, reduces airflow energy loss, improves fan working efficiency and reduces noise. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is an external structure schematic view of the fan of the utility model embodiment 1.

[0032] Figure 2 It is an internal structure schematic view of the fan of the utility model embodiment 1.

[0033] Figure 3 It is an external structure schematic view of the fan vane diffuser structure of the utility model embodiment 1.

[0034] Figure 4It is the internal structure schematic view of the vane diffuser structure of the embodiment 1 of the utility model.

[0035] Figure 5 It is the structure schematic view of the primary vane assembly of the embodiment 1 of the utility model.

[0036] Figure 6 It is the overhead view of the primary vane assembly of the embodiment 1 of the utility model.

[0037] Figure 7 It is the sectional view of the partial structure of the primary vane assembly of the embodiment 1 of the utility model.

[0038] Mark explanation:

[0039] Fan 1

[0040] Fan inlet 10

[0041] Moving vane 2

[0042] Vane diffuser structure 3

[0043] Vane diffuser structure 3

[0044] Primary vane assembly 32

[0045] Primary vane hub 321

[0046] Primary vane 322

[0047] Fixed blade 3220

[0048] Hollow structure 3221

[0049] Telescopic blade 3223

[0050] Elastic member 324

[0051] Secondary vane assembly 33

[0052] Secondary vane hub 331

[0053] Secondary vane 332

[0054] Motor 4

[0055] Motor output shaft 41

[0056] Motor housing 5

[0057] Airflow flow direction A

[0058] Primary vane hub radial direction B

[0059] Primary vane hub axial direction C Specific implementation

[0060] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0061] Example 1

[0062] This embodiment provides a stator vane diffuser structure 3 for a fan 1. Figures 1-2 The structure of fan 1 is shown. Fan 1 includes a moving impeller 2, a stationary vane diffuser structure 3, and a motor 4 arranged sequentially along the air inlet direction. The motor 4 is housed in a motor housing 5. The output shaft 41 of the motor passes through the stationary vane diffuser structure 3 and is connected to the moving impeller 2. The stationary vane diffuser structure 3 is also connected to the moving impeller 2 inside the fan 1. The motor 4 drives the moving impeller 2 to rotate at high speed. Airflow is drawn in from the fan inlet 10. After gaining significant kinetic energy through the high-speed rotating moving impeller 2, the airflow flows radially along the moving impeller 2 (the radial direction of the moving impeller 2 is the same as the radial direction B of the first-stage stationary impeller hub), then flows out from the outlet of the moving impeller 2, and then flows axially into the stationary vane diffuser structure 3 for diffusion. Finally, the airflow flows out through the casing.

[0063] like Figures 3-7 As shown, the stator diffuser structure 3 includes a stator casing 31 and a primary stator assembly 32 and at least one secondary stator assembly 33 arranged sequentially in the stator casing 31 along the flow direction of the airflow. The primary stator assembly 32 includes a primary stator hub 321 and a plurality of primary stator blades 322 spaced apart on the circumferential surface of the primary stator hub 321.

[0064] The primary stationary vane 322 includes a fixed vane 3220 and a retractable vane 3223. Along the radial direction B of the primary stationary vane hub 321, one end of the fixed vane 3220 is fixed to the primary stationary vane hub 321, and the other end of the fixed vane 3220 is retractably connected to the retractable vane 3223. The outer end face of the retractable vane 3223 facing the stationary vane housing 31 matches the contour of the inner wall of the stationary vane housing 31. When the retractable vane 3223 is retracted, the outer end face is spaced apart from the inner wall of the stationary vane housing 31. When the retractable vane 3223 is extended, the outer end face abuts against the inner wall of the stationary vane housing 31.

[0065] Specifically, in this embodiment, several primary stator vanes 322 are arranged at the same inclination angle on the circumferential surface of the primary stator vane hub 321. The airflow is guided by the primary stator vanes 322, forming an oblique flow. The retractable vane 3223 and the fixed vane 3220 are retractably connected by an elastic member 324. In other embodiments, there are various structural forms for achieving the retractable connection. Depending on the structural fit requirements, other connection structures that can also achieve retractability can also be used. In this embodiment, the stator vane diffuser structure 3 has only one secondary stator vane assembly 33, forming a two-stage stator vane structure. However, in other embodiments, depending on the desired effect, there can be multiple secondary stator vane assemblies 33 or tertiary and quaternary stator vane assemblies.

[0066] In the design of the primary stationary blade 322 of the fan 1, the telescopic blade 3223 is connected to the fixed blade 3220 in a telescopic manner. This allows for a gap between the primary stationary blade 322 and the stationary blade casing 31 when retracted, satisfying the requirement for axial (axial direction C is the axis of the stationary blade hub) installation of the primary stationary blade 322. Conversely, when extended, the primary stationary blade 322 abuts against the inner wall of the stationary blade casing 31, eliminating the gap, reducing airflow energy loss, improving the working efficiency of the fan 1, and reducing noise. Specifically, the outer end face of the telescopic blade 3223 facing the stationary blade casing 31 is designed to match the contour of the inner wall of the stationary blade casing 31, ensuring that the outer end face of the telescopic blade 3223 fits snugly against the inner wall of the stationary blade casing 31, eliminating the gap.

[0067] As explained above, in this embodiment, the fixed blade 3220 and the retractable blade 3223 are elastically connected. When the retractable blade 3223 is not elastically compressed and is fully extended, the total length of the fixed blade 3220 and the retractable blade 3223 along the radial direction B is greater than the distance between the outer wall of the first-stage stationary blade hub 321 and the inner wall of the stationary blade casing 31. The elastic connection between the fixed blade 3220 and the retractable blade 3223 achieves a retractable connection. Compared with other retractable methods, this elastic retraction method is more flexible, and the elastic force can ensure that the outer end face of the retractable blade 3223 is tightly attached to the inner wall of the stationary blade casing 31, improving the reliability of the fit. When the retractable blade 3223 is not elastically compressed and is fully extended, the above-mentioned arrangement ensures that the total length of the fixed blade 3220 and the retractable blade 3223 along the radial direction B is greater than the distance between the outer wall of the first-stage stationary blade hub 321 and the inner wall of the stationary blade casing 31, so that the retractable blade 3223 extends to a sufficient length to ensure that it can abut against the inner wall of the stationary blade casing 31.

[0068] Among them, such as Figure 7 As shown, the fixed leaf 3220 includes a hollow structure 3221. Three elastic elements 324 are provided within the hollow structure 3221. A portion of the retractable leaf 3223 is placed within the hollow structure 3221. The two ends of the elastic elements 324 along the radial direction B abut against the inner wall of the fixed leaf 3220 within the hollow structure 3221 and the retractable leaf 3223, respectively. By placing the elastic elements 324 and a portion of the retractable leaf 3223 within the hollow structure 3221, the telescopic movement space of the retractable leaf 3223 is confined within the hollow structure 3221, free from external interference, which helps improve the stability of the telescopic movement.

[0069] In other embodiments, the number of elastic members 324 arranged in the hollow structure 3221 can be adjusted as needed according to the size of the hollow structure 3221 and the size of the spring, but there is at least one elastic member 324. According to the type and size of the elastic member 324, the telescopic blade 3223 can be partially or entirely placed in the hollow structure 3221, as long as the length of the telescopic blade 3223 is sufficient to abut against the inner wall of the vane casing 31 when the telescopic blade 3223 is pushed out by the elastic member 324.

[0070] In this embodiment, the elastic member 324 is a spring, which has a simple structure and reliable elastic force. In addition, different materials and lengths of springs can be selected flexibly according to different telescopic length requirements.

[0071] As shown in Figure 7 , along the axial direction C of the primary vane hub 321, the telescopic blade 3223 is attached to the inner wall of the fixed blade 3220. Through such a design, the upper and lower surfaces of the telescopic blade 3223 along the axial direction C of the primary vane hub 321 are attached to the inner wall of the fixed blade 3220 with a small gap, and the telescopic blade 3223 slides in the hollow structure 3221 with a small gap, reducing the shaking during the telescopic movement and further improving the stability of the telescopic blade 3223 during the telescopic movement.

[0072] Among them, the three elastic members 324 in the hollow structure 3221 are arranged at intervals along the circumferential direction of the fixed blade 3220, so that the force on each contact position between the telescopic blade 3223 and the inner wall of the vane casing 31 in the circumferential direction is uniform, avoiding the shaking of the telescopic blade 3223 under the impact of high-speed airflow, which causes additional noise.

[0073] Among them, in this embodiment, the fixed blade 3220 is integrally formed with the primary vane hub 321, reliably ensuring that there is no gap between the fixed blade 3220 and the primary vane hub 321, and reducing the assembly steps and the assembly difficulty.

[0074] Among them, as shown in Figure 4 , the secondary vane assembly 33 includes a secondary vane hub 331 and a plurality of secondary vanes 332 arranged at intervals on the circumferential surface of the secondary vane hub 331; the secondary vane hub 331, the secondary vanes 332 and the vane casing 31 are integrally formed. Similarly, the secondary vane hub 331, the secondary vanes 332 and the vane casing 31 are integrally formed, reliably ensuring that there is no gap between the two ends of the secondary vanes 332 along the radial direction B and the secondary vane hub 331 and the vane casing 31, further improving the working efficiency of the fan 1 and reducing the noise; and reducing the assembly steps and the assembly difficulty.

[0075] Embodiment 2

[0076] The embodiment provides a fan 1, wherein a movable impeller 2 and a stationary blade diffuser structure 3 as in the embodiment 1 are arranged in the fan 1, and the stationary blade diffuser structure 3 is connected to the movable impeller 2. The fan 1 meets the assembly requirement of the first-stage stationary blade 322 and eliminates the gap between the first-stage stationary blade 322 and the stationary blade casing 31 by adopting the stationary blade diffuser structure 3, reduces the flow energy loss of airflow, improves the working efficiency of the fan 1 and reduces noise.

[0077] Embodiment 3

[0078] The embodiment provides a household appliance, which comprises the fan 1 as in the embodiment 2. The household appliance can be a range hood, a dust collector or the like, and the fan 1 as in the embodiment 2 is adopted, so that the flow energy loss of airflow is reduced, the working efficiency of the fan 1 is improved and noise is reduced.

[0079] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, but these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A stator vane diffuser structure of a fan, connected to a rotor in the fan, the stator vane diffuser structure comprising a stator vane casing and a primary stator vane assembly and at least one secondary stator vane assembly arranged in sequence along a flow direction of an airflow in the stator vane casing, the primary stator vane assembly comprising a primary stator vane hub and a plurality of primary stator vanes spaced apart on a circumferential surface of the primary stator vane hub; characterized in that the primary stator vanes comprise a fixed vane and a retractable vane, one end of the fixed vane being fixed to the primary stator vane hub and the other end of the fixed vane being retractably connected to the retractable vane along a radial direction of the primary stator vane hub; the retractable vane has an outer end face that matches a profile of an inner wall of the stator vane casing, the outer end face being spaced apart from the inner wall of the stator vane casing when the retractable vane is retracted and abutting against the inner wall of the stator vane casing when the retractable vane is extended. The fixed vane and the retractable vane are elastically connected, and when the retractable vane is not elastically compressed and is fully extended, a total length of the fixed vane and the retractable vane along the radial direction is greater than a distance between an outer wall of the primary stator vane hub and the inner wall of the stator vane casing. The fixed vane comprises a hollow structure, at least one elastic member is arranged in the hollow structure, and at least part of the retractable vane is arranged in the hollow structure, both ends of the elastic member along the radial direction abutting against an inner wall of the fixed vane in the hollow structure and the retractable vane respectively. The elastic member is a spring.

2. The stator vane diffuser structure of a fan according to claim 1, wherein Along an axial direction of the primary stator vane hub, the retractable vane abuts against an inner wall of the fixed vane.

3. The stator vane diffuser structure of a fan according to claim 2, wherein A plurality of elastic members are arranged in the hollow structure, and the plurality of elastic members are spaced apart along a circumferential direction of the fixed vane.

4. The stator vane diffuser structure of a fan according to claim 3, wherein The fixed vane and the primary stator vane hub are integrally formed.

5. The stator vane diffuser structure of a fan according to claim 3, wherein The secondary stator vane assembly comprises a secondary stator vane hub and a plurality of secondary stator vanes spaced apart on a circumferential surface of the secondary stator vane hub.

6. The stator vane diffuser structure of a fan according to claim 3, wherein The secondary stator vane hub, the secondary stator vanes and the stator vane casing are integrally formed.

7. The stator vane diffuser structure of a fan according to claim 1, wherein A rotor and the stator vane diffuser structure of the fan according to any one of claims 1-8 are installed in the fan, and the stator vane diffuser structure is connected to the rotor.

8. The vane diffuser structure of a fan according to any one of claims 1 to 7, characterized in that, The household appliance comprises the fan according to claim 9. ​ 9. A fan, characterized by ​ 10. An electric home appliance characterized by comprising: ​

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