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 blades and the first-stage stationary blade hub are formed in a split mode, a plurality of casing holes matched with the first-stage stationary blades are formed in the circumferential wall of the stationary blade casing, the first-stage stationary blades are arranged to be inserted from the casing holes until the first-stage stationary blades abut against or stretch into the first-stage stationary blade hub, and the radial length of the first-stage stationary blades is not smaller than the distance between the stationary blade casing and the first-stage stationary blade hub. 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 of the first-stage stationary blade, the stationary blade case and the first-stage stationary blade hub is realized in an insertion manner, meanwhile, a gap between the first-stage stationary blade and the stationary blade case is eliminated, the flowing energy loss of airflow is reduced, the working efficiency of the fan is improved, and the 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 fumes.

[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 static vane assembly 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 from 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 some overlap from the axial direction. Therefore, the first-stage static vanes cannot be extracted from the mold along the axial direction (i.e., cannot be extracted from the mold along the axial direction). Therefore, to ensure the manufacturing process, the first-stage static vanes generally do not have a static vane casing, and the first-stage static vanes are assembled to the second-stage static vanes along 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, to ensure that the first-stage static vanes can be assembled into the casing, the condition D1 < D2 generally needs to be met.

[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 axial airflow. The tangential airflow will cause energy loss and generate aerodynamic noise. Because 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 axial airflow, resulting in a lot of energy loss, reduced fan efficiency, and increased noise. In addition, because the airflow in the gap between the static vanes is high-speed airflow, the high-speed airflow will generate a lot of noise in the gap, resulting in a large fan noise and poor sound quality. SUMMARY

[0005] The utility model wants to solve the technical problem that is to overcome the defects of low efficiency and loud noise of the fan in the prior art, provide a fan static vane diffuser structure and including its fan, household electrical appliances.

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

[0007] A fan static vane diffuser structure is connected to the dynamic impeller in the fan, the static vane diffuser structure includes a static vane casing and a first-stage vane assembly and at least one second-stage vane assembly arranged in the static vane casing in the flow direction of the airflow, the first-stage vane assembly includes a first-stage vane hub and a plurality of first-stage vanes arranged on the circumferential surface of the first-stage vane hub, the first-stage vane and the first-stage vane hub are formed separately, the first-stage vane has a cross section perpendicular to the radial direction of the first-stage vane hub, the circumferential wall of the static vane casing is provided with a plurality of casing holes matching the profile of the cross section, the first-stage vane is arranged to be inserted into the casing hole and the end of the first-stage vane abuts against the outer surface of the first-stage vane hub or extends into the circumferential wall of the first-stage vane hub, when the end of the first-stage vane abuts against the outer surface of the first-stage vane hub, the abutting end surface of the first-stage vane matches the outer surface of the first-stage vane hub, and the length of the first-stage vane in the radial direction is not less than the distance between the static vane casing and the first-stage vane hub.

[0008] In the present scheme, the fan static vane diffuser structure in the design of the first-stage vane, by opening the casing hole matching the cross section of the first-stage vane on the static vane casing, the first-stage vane is assembled with the static vane casing and the first-stage vane hub in the form of insertion, when the first-stage vane is inserted into the static vane casing and the other end thereof abuts against or extends into the circumferential wall of the first-stage vane hub, 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, when the end of the first-stage vane abuts against the outer surface of the first-stage vane hub, the abutting end surface of the first-stage vane matches the outer surface of the first-stage vane hub, ensuring that the abutting surface between the two has no gap, and the length of the first-stage vane in the radial direction is not less than the distance between the static vane casing and the first-stage vane hub, ensuring that the first-stage vane has sufficient length so that the two ends thereof have no gap with the static vane casing and the first-stage vane hub.

[0009] Preferably, the gap between the static vane casing and the first-stage vane located in the casing hole is filled with sealing material.

[0010] In the present scheme, by filling the sealing material, the air tightness between the static vane casing and the first-stage vane is further improved, ensuring no gap.

[0011] Preferably, when one end of the primary vane abuts against the outer surface of the primary vane hub, the length of the primary vane along the radial direction is equal to the sum of the distance between the vane casing and the primary vane hub and the wall thickness of the vane casing.

[0012] In this scheme, when one end of the primary vane abuts against the outer surface of the primary vane hub, the above arrangement is adopted so that the length of the primary vane will not be too long, and after the primary vane is inserted into the vane casing, the outer surface of the vane casing remains flat and more beautiful.

[0013] Preferably, when one end of the primary vane extends into the circumferential wall of the primary vane hub, the circumferential wall of the primary vane hub is provided with a plurality of hub grooves matching the profile of the cross section, and at least part of the hub grooves accommodate the primary vane.

[0014] In this scheme, through the above-mentioned hub grooves, a gapless fit between the primary vane and the primary vane hub is achieved, and the primary vane is accommodated in the hub groove, improving the reliability of the connection and the gapless reliability between the two. Wherein, the hub groove matches the hub of the cross section of the primary vane, which is conducive to the cooperation of the primary vane and the primary vane hub on the circumferential surface.

[0015] Preferably, the length of the primary vane along the radial direction is equal to the sum of the distance between the vane casing and the primary vane hub, the wall thickness of the vane casing, and the depth of the hub groove.

[0016] In this scheme, when one end of the primary vane extends into the hub groove of the primary vane hub, the above arrangement is adopted so that the length of the primary vane will not be too long, and after the primary vane is inserted into the vane casing, the outer surface of the vane casing remains flat and more beautiful.

[0017] Preferably, a sealing material is filled in the gap between the primary vane hub and the primary vane located in the hub groove.

[0018] In this scheme, by filling the sealing material, the air tightness between the primary vane hub and the primary vane is further improved to ensure gapless.

[0019] Preferably, the vane casing is provided with a chamfer at the profile edge of the casing hole.

[0020] In this scheme, by providing a chamfer at the profile edge of the casing hole, the primary vane is easily positioned and smoothly inserted.

[0021] Preferably, the secondary vane assembly comprises a secondary vane hub and a plurality of secondary vanes arranged at intervals on the circumferential surface of the secondary vane hub; the secondary vane hub, the secondary vanes and the vane casing are integrally formed.

[0022] In the scheme, the secondary static vane hub, the secondary static vane and the static vane casing are integrally formed, so that the secondary static vane has no gap between the two ends in the radial direction and the secondary static vane hub and the static vane casing, further improving the working efficiency of the fan and reducing the noise; and the assembly steps are reduced, and the assembly difficulty is reduced.

[0023] A fan, wherein a moving vane wheel and the static vane diffuser structure of the fan are installed in the fan, and the static vane diffuser structure is connected to the moving vane wheel.

[0024] In the scheme, the fan realizes the assembly of the primary static vane, the static vane casing and the primary static vane hub in an inserted manner by using the static vane diffuser structure, and eliminates the gap between the primary static vane and the static vane casing, reduces the energy loss of airflow, improves the working efficiency of the fan and reduces the noise.

[0025] A household appliance, wherein the household appliance comprises the fan.

[0026] In the scheme, the household appliance realizes the assembly of the primary static vane, the static vane casing and the primary static vane hub in an inserted manner by using the fan, and eliminates the gap between the primary static vane and the static vane casing, reduces the energy loss of airflow, improves the working efficiency of the fan and reduces the noise.

[0027] The positive progress effect of the fan, the fan comprising the static vane diffuser structure and the household appliance is that the assembly of the primary static vane, the static vane casing and the primary static vane hub is realized in an inserted manner, the gap between the primary static vane and the static vane casing is eliminated, the energy loss of airflow is reduced, the working efficiency of the fan is improved and the noise is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is an external structure schematic view of the fan of the embodiment 1 of the utility model (only the casing hole at one position of the static vane casing is shown in the figure, the casing hole is not shown at other positions of the circumferential outer wall of the static vane casing, but the casing hole should be arranged at all positions).

[0029] Figure 2 It is an internal structure schematic view of the fan of the embodiment 1 of the utility model.

[0030] Figure 3 It is an external structure schematic view of the static vane diffuser structure of the embodiment 1 of the utility model (only the casing hole at one position of the static vane casing is shown in the figure, the casing hole is not shown at other positions of the circumferential outer wall of the static vane casing, but the casing hole should be arranged at all positions).

[0031] Figure 4An internal structure schematic view of the vane diffuser structure of the embodiment 1 of the utility model.

[0032] Mark explanation:

[0033] Fan 1

[0034] Fan inlet 10

[0035] Moving blade wheel 2

[0036] Vane diffuser structure 3

[0037] Vane diffuser structure 3

[0038] Casing hole 311

[0039] Primary vane assembly 32

[0040] Primary vane hub 321

[0041] Primary vane 322

[0042] Secondary vane assembly 33

[0043] Secondary vane hub 331

[0044] Secondary vane 332

[0045] Motor 4

[0046] Motor output shaft 41

[0047] Motor housing 5

[0048] Air flow direction A

[0049] Radial direction of primary vane hub B

[0050] Axial direction of primary vane hub C Specific implementation

[0051] The utility model will be described in detail below with a preferred embodiment and in combination with the drawings.

[0052] Embodiment 1

[0053] This embodiment provides a vane diffuser structure 3 of fan 1, Figures 1-2The structure of the fan 1 is shown, which comprises a moving impeller 2, a stationary blade diffuser structure 3 and a motor 4 arranged in sequence along the air inlet direction (i.e. the flow direction A of the airflow), the motor 4 is arranged in a motor housing 5, the output shaft 41 of the motor is connected with the moving impeller 2 through the stationary blade diffuser structure 3, and the stationary blade diffuser structure 3 is also connected with the moving impeller 2 in the fan 1. The motor 4 drives the moving impeller 2 to rotate at high speed, the airflow is sucked from the fan inlet 10, obtains a large kinetic energy after passing through the high-speed rotating moving impeller 2, flows along the radial direction of the moving impeller 2 (the radial direction of the moving impeller 2 is the same as the radial direction B of the primary stationary blade hub 321), then flows out from the moving impeller 2 outlet, and then flows into the stationary blade diffuser structure 3 in the axial direction C for diffusing, and finally the airflow flows out through the motor housing.

[0054] As shown in Figures 3-4 The stationary blade diffuser structure 3 comprises a stationary blade casing 31 and a primary stationary blade assembly 32 and at least one secondary stationary blade assembly 33 arranged in sequence along the flow direction A of the airflow in the stationary blade casing 31, the primary stationary blade assembly 32 comprises a primary stationary blade hub 321 and a plurality of primary stationary vanes 322 arranged on the circumferential surface of the primary stationary blade hub 321.

[0055] The primary stationary vanes 322 and the primary stationary blade hub 321 are formed separately, the primary stationary vanes 322 have a cross section perpendicular to the radial direction of the primary stationary blade hub 321 (not shown in the figure), the circumferential wall of the stationary blade casing 31 is provided with a plurality of casing holes 311 matching the profile of the cross section, and the primary stationary vanes 322 are arranged to be inserted from the casing holes 311 and to abut against the outer surface of the primary stationary blade hub 321 or extend into the circumferential wall of the primary stationary blade hub 321 by one end of the primary stationary vanes 322, when the one end of the primary stationary vanes 322 abuts against the outer surface of the primary stationary blade hub 321, the abutting end surface of the primary stationary vanes 322 matches the outer surface of the primary stationary blade hub 321, and the length of the primary stationary vanes 322 along the radial direction B is not less than the distance between the stationary blade casing 31 and the primary stationary blade hub 321.

[0056] Specifically, in the embodiment, after the primary stationary vanes 322 are inserted into the casing holes 311, a plurality of primary stationary vanes 322 are arranged on the circumferential surface of the primary stationary blade hub 321 at the same inclination angle, the airflow is guided by the primary stationary vanes 322 to form a diagonal flow. The stationary blade diffuser structure 3 has only one secondary stationary blade assembly 33, forming a two-stage stationary blade structure, but in other embodiments, according to the needs of the effect, there can be multiple secondary stationary blade assemblies 33 or three-stage, four-stage stationary blade assemblies. In the embodiment, the connection between the primary stationary vanes 322 and the primary stationary blade hub 321 adopts the abutting mode, that is, after the primary stationary vanes 322 are inserted into the casing holes 311, the end surface thereof gradually approaches the primary stationary blade hub 321 until abutting against the outer surface of the primary stationary blade hub 321.

[0057] The vane diffuser structure 3 of the fan 1 is designed in the first-stage vane 322. A casing hole 311 matching the cross section of the first-stage vane 322 is formed on the vane casing 31. The first-stage vane 322 is inserted into the vane casing 31 and the first-stage vane hub 321. When the first-stage vane 322 is inserted into the vane casing 31 and the other end thereof abuts or extends into the circumferential wall of the first-stage vane hub 321, the gap is eliminated, the flow energy loss of the airflow is reduced, the working efficiency of the fan 1 is improved, and the noise is reduced. When the one end of the first-stage vane 322 abuts the outer surface of the first-stage vane hub 321, the abutting surface between the one end of the first-stage vane 322 and the outer surface of the first-stage vane hub 321 is matched, and the gap between the two is eliminated. The length of the first-stage vane 322 in the radial direction is not less than the distance between the vane casing 31 and the first-stage vane hub 321, so that the length of the first-stage vane 322 is sufficient to ensure that the two ends of the first-stage vane 322 are free of gaps with the vane casing 31 and the first-stage vane hub 321.

[0058] In order to better achieve the gap-free state, a sealing material can be filled in the gap between the vane casing 31 and the first-stage vane 322 located in the casing hole 311, further improving the air tightness between the vane casing 31 and the first-stage vane 322, and ensuring the gap-free state.

[0059] In this embodiment, the length of the first-stage vane 322 in the radial direction B is equal to the sum of the distance between the vane casing 31 and the first-stage vane hub 321 and the wall thickness of the vane casing 31, so that the length of the first-stage vane 322 is not too long, and the outer surface of the vane casing 31 remains flat after the first-stage vane 322 is inserted into the vane casing 31, which is more beautiful.

[0060] In other embodiments, the connection between the first-stage vane 322 and the first-stage vane hub 321 can also be achieved by extending the first-stage vane 322 into the circumferential wall of the first-stage vane hub 321. For example, the circumferential wall of the first-stage vane hub 321 is provided with a plurality of hub grooves (not shown in the figure) matching the cross-sectional profile, and the first-stage vane 322 is inserted into part or all of the hub grooves. Through the hub grooves, the first-stage vane 322 and the first-stage vane hub 321 are connected without gaps, and the first-stage vane 322 is accommodated in the hub grooves, improving the reliability of the connection between the two and the reliability of the gap-free state. The hub grooves match the cross-sectional profile of the first-stage vane 322, which is conducive to the cooperation of the first-stage vane 322 and the first-stage vane hub 321 on the circumferential surface.

[0061] At this time (i.e. the primary vanes 322 are inserted into the casing hole 311 and the hub groove in turn), the radial length of the primary vanes 322 is equal to the sum of the distance between the vane casing 31 and the primary vane hub 321, the wall thickness of the vane casing 31 and the depth of the hub groove, so that the length of the primary vanes 322 is not too long, and the outer surface of the vane casing 31 remains flat after the primary vanes 322 are inserted into the vane casing 31, which is more beautiful.

[0062] When the primary vanes 322 are inserted into the hub groove, the gap between the primary vane hub 321 and the primary vanes 322 located in the hub groove is filled with sealing material, further improving the air tightness between the primary vane hub 321 and the primary vanes 322, and ensuring no gap.

[0063] In this embodiment, the vane casing 31 is also provided with a chamfer (not shown in the figure) at the profile edge of the casing hole 311, which facilitates the positioning and smooth insertion of the primary vanes 322.

[0064] In this embodiment, the secondary vane assembly 33 includes a secondary vane hub 331 and a plurality of secondary vanes 332 arranged at intervals on the peripheral surface of the secondary vane hub 331; the secondary vane hub 331, the secondary vanes 332 and the vane casing 31 are integrally formed. In such a structure, 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 noise; and reducing the assembly steps and assembly difficulty.

[0065] Embodiment 2

[0066] This embodiment provides a fan 1, which is provided with a moving blade wheel 2 and a vane diffuser structure 3 as in Embodiment 1, and the vane diffuser structure 3 is connected to the moving blade wheel 2. The fan 1 realizes the assembly of the primary vanes 322, the vane casing 31 and the primary vane hub 321 in an inserted manner by using the above-mentioned vane diffuser structure 3, while eliminating the gap between the primary vanes 322 and the vane casing 31, reducing the energy loss of airflow, improving the working efficiency of the fan 1 and reducing noise.

[0067] Embodiment 3

[0068] The embodiment provides a household appliance, which comprises the fan 1 as in the embodiment 2, and the household appliance can be a range hood, a dust collector or the like, which adopts the fan 1 as in the embodiment 2 to realize the assembly of the first-stage vane 322, the vane casing 31 and the first-stage vane hub 321 in a plug-in mode, meanwhile, the gap between the first-stage vane 322 and the vane casing 31 is eliminated, the flow energy loss of air flow is reduced, the working efficiency of the fan 1 is improved and the noise is reduced.

[0069] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application 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 present application, but these changes and modifications all fall within the protection scope of the present application.

Claims

1. A vane diffuser structure of a fan, connected to an impeller in the fan, the vane diffuser structure comprising a vane casing and a first stage vane assembly and at least one second stage vane assembly arranged in the vane casing in sequence along a flow direction of an airflow, the first stage vane assembly comprising a first stage vane hub and a plurality of first stage vanes arranged on a circumferential surface of the first stage vane hub, characterized in that, the first stage vanes and the first stage vane hub are formed separately, the first stage vanes have a cross section perpendicular to a radial direction of the first stage vane hub, a circumferential wall of the vane casing is provided with a plurality of casing holes matching a profile of the cross section, the first stage vanes are arranged to be inserted from the casing holes and until an end of the first stage vanes abuts against an outer surface of the first stage vane hub or extends into the circumferential wall of the first stage vane hub, when the end of the first stage vanes abuts against the outer surface of the first stage vane hub, an abutting end surface of the first stage vanes matches the outer surface of the first stage vane hub, a length of the first stage vanes along the radial direction is not less than a distance between the vane casing and the first stage vane hub. A gap between the vane casing and the first stage vanes located in the casing holes is filled with a sealing material.

2. The stator vane diffuser structure of a fan according to claim 1, wherein When the end of the first stage vanes abuts against the outer surface of the first stage vane hub, the length of the first stage vanes along the radial direction is equal to a sum of the distance between the vane casing and the first stage vane hub and a wall thickness of the vane casing.

3. The stator vane diffuser structure of a fan according to claim 1, wherein When the end of the first stage vanes extends into the circumferential wall of the first stage vane hub, the circumferential wall of the first stage vane hub is provided with a plurality of hub grooves matching the profile of the cross section, and at least part of the hub grooves accommodate the first stage vanes.

4. The stator vane diffuser structure of a fan according to claim 1, wherein The length of the first stage vanes along the radial direction is equal to a sum of the distance between the vane casing and the first stage vane hub, the wall thickness of the vane casing and a depth of the hub grooves.

5. The stator vane diffuser structure of a fan according to claim 4, wherein A gap between the first stage vane hub and the first stage vanes located in the hub grooves is filled with a sealing material.

6. The stator vane diffuser structure of a fan according to claim 4, wherein The vane casing is provided with a chamfer at a profile edge of the casing hole.

7. The vane diffuser structure of a fan according to any one of claims 1 to 6, characterized in that, The second stage vane assembly comprises a second stage vane hub and a plurality of second stage vanes arranged on a circumferential surface of the second stage vane hub, and the second stage vane hub, the second stage vanes and the vane casing are integrally formed.

8. The stator vane diffuser structure of any one of claims 1-6, wherein, The fan is provided with an impeller and the vane diffuser structure of the fan according to any one of claims 1-8, and the vane diffuser structure is connected to the impeller.

9. A fan, characterized by The household appliance comprises the fan according to claim 9.

10. An electric home appliance characterized by comprising: ​

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