Two-stage fan with oil removal function and range hood

Abstract

A two-stage fan with an oil removal function comprises a shell, axial flow fan blades and a centrifugal fan impeller, the shell is provided with a first-stage air inlet and an air outlet, and the axial flow fan blades and the centrifugal fan impeller are arranged in the shell and sequentially arranged in the direction from the first-stage air inlet to the air outlet; a filtering piece is fixed on the axial flow fan blade, and is provided with an overflowing channel for airflow to circulate; the section, capable of allowing airflow to circulate, of the axial flow fan blade is a first section, and the first section is covered with the filtering piece. The utility model further provides a range hood using the two-stage fan. Compared with the prior art, the two-stage fan is provided with the axial flow fan blade and the centrifugal fan impeller, and the filter piece is fixed on the axial flow fan blade, so that the suction capacity is ensured, the two-stage fan has the self-cleaning capacity, and the lampblack filtering effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of range hood fans, and particularly relates to a two-stage fan with an oil removal function and a range hood using the two-stage fan. Background Art

[0002] At present, the existing range hoods use centrifugal fans to suck oil fumes. However, in actual use, the oil fumes will adhere to the impeller when being extracted, resulting in changes in the arc and smoothness of the impeller surface, a decrease in the air extraction efficiency, and a deterioration in the air extraction effect. In addition, after the range hood has been used for a period of time, the inner wall of the range hood and the air outlet pipe are all covered with oil stains, and the hygiene is poor.

[0003] In the face of this problem, the existing solutions are to regularly clean the oil stains to keep the fan impeller clean. Although these solutions are feasible, their comprehensive cleaning cost is high, the cleaning process is troublesome, and during the cleaning process, most of the oil fumes are finally discharged into the atmosphere, which will cause air pollution. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a two-stage fan with an oil removal function.

[0005] To achieve the above purpose, the utility model discloses a two-stage fan with an oil removal function, which includes a housing, an axial flow fan blade, and a centrifugal fan impeller. The housing is provided with a first-stage air inlet and an air outlet, and the axial flow fan blade and the centrifugal fan impeller are arranged in the housing and are sequentially arranged along the direction from the first-stage air inlet to the air outlet;

[0006] A filter element is fixed on the axial flow fan blade, and the filter element is provided with a flow-through channel for air flow;

[0007] The cross-section of the axial flow fan blade through which air flow can pass is a first cross-section, and the filter element covers the first cross-section.

[0008] Preferably, a wind shield ring is arranged outside the axial flow fan blade on the housing. In the axial direction of the shaft of the axial flow fan blade, the wind shield ring blocks the gap between the axial flow fan blade and the housing or the gap between the filter element and the housing.

[0009] Further preferably, the wind shield ring completely blocks the gap between the axial flow fan blade and the housing or the gap between the filter element and the housing.

[0010] Further preferably, the outer wall of the wind shield ring is in a hook shape to form a wind guiding surface.

[0011] Further preferably, an oil collecting groove is arranged inside the wind shield ring.

[0012] Further preferably, an oil leakage hole penetrating through to the oil sump is provided on the wind shield ring, and the oil leakage hole is arranged in the vertical direction.

[0013] Preferably, there are two filter elements, and the two filter elements are respectively arranged on the inner and outer sides of the axial flow fan blades.

[0014] Preferably, the cross-section of the axial flow fan blades through which air can flow is the first cross-section, and the filter element is in a net shape and covers the first cross-section.

[0015] Preferably, the axial flow fan blades and the centrifugal fan impeller are driven to rotate by the same motor shaft.

[0016] The present utility model also provides an oil fume extractor using the above-mentioned double-stage fan.

[0017] An oil fume extractor includes a fan, and the fan is the double-stage fan with an oil removal function described in any one of the above.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] The axial flow fan blades and the centrifugal fan impeller are sequentially arranged along the direction from the first-stage air inlet to the air outlet. A filter element is fixed on the axial flow fan blades, and an air flow passage for air to flow through is provided on the filter element. When sucking oil fume, the external oil fume flows along the direction of its rotating shaft under the action of the axial flow fan blades and passes through the filter element. When the oil fume passes through the filter element, it is swept by the filter element, and the filter element filters the oil in the oil fume. Thus, when the oil fume flows to the centrifugal fan impeller, since the oil in the air flow is basically filtered, the situation of oil stain adhesion on the centrifugal fan impeller is greatly reduced, and the oil fume suction effect and hygiene of the centrifugal fan impeller are improved.

[0020] Since the filter element is fixed on the axial flow fan blades and can rotate with the axial flow fan blades, the oil stain on the filter element will be subjected to centrifugal force, and under the action of this force, the oil will be thrown onto the inner wall of the housing. In this way, after long-term use, the oil content on the filter element is less, and it still has a good filtering effect, avoiding the problems of high use cost and poor experience caused by the need to replace the filter element after a period of use.

[0021] After the oil is thrown onto the inner wall of the housing, it flows to the oil fume tank, and the user only needs to clean the oil stain in the oil fume tank, which is convenient to clean.

[0022] The axial flow fan blades are selected for this utility model. Compared with the centrifugal fan blades, the oil fume can flow stably along the direction of the blade rotating shaft, and there will be no turbulent flow at the position of the first-stage air inlet. Its oil fume suction effect is good, which is beneficial to improving the oil fume suction capacity. Since the filter element is fixed on the axial flow fan blades, its suction capacity is relatively weak. Therefore, through the mutual cooperation of the axial flow fan blades and the centrifugal fan impeller, the suction capacity of the whole fan is ensured, and the oil fume suction effect is improved. Description of the Drawings

[0023] Figure 1 The oil fume extractor with a two-stage fan with an oil removal function in Embodiment 1;

[0024] Figure 2 is Figure 1 the cross-sectional schematic diagram of the oil fume extractor in

[0025] Figure 3 is Figure 1 the bottom view of the oil fume extractor in

[0026] Figure 4 the structural schematic diagram of the axial flow fan blades;

[0027] Shell 1; First-stage air inlet 11; Air outlet 12; Windshield ring 13; Oil collecting tank 14; Oil leakage hole 15;

[0028] Axial flow fan blades 2;

[0029] Centrifugal fan impeller 3; Second-stage air inlet 31;

[0030] Filter element 4;

[0031] Bolt 5;

[0032] Cover plate 6;

[0033] Motor 7; Motor shaft 71. Detailed Embodiment

[0034] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0035] Embodiment 1

[0036] A two-stage fan with an oil removal function, refer to Figure 1 - Figure 2, including a housing 1, an axial-flow fan blade 2 and a centrifugal fan impeller 3. Among them, the axial-flow fan blade 2 and the centrifugal fan impeller 3 can adopt existing structures, and their structures will not be elaborated here. The housing 1 is provided with a first-stage air inlet 11 and an air outlet 12. The first-stage air inlet 11 faces downward, and the air outlet 12 is matched with the air outlet direction of the centrifugal fan impeller 3. In this embodiment, the centrifugal fan impeller 3 and the axial-flow fan blade 2 are coaxially arranged, and the air outlet 12 is located beside the centrifugal fan impeller 3. The axial-flow fan blade 2 and the centrifugal fan impeller 3 are arranged in the housing 1 and are arranged in sequence along the direction from the first-stage air inlet 11 to the air outlet 12; a filter element 4 is fixed on the axial-flow fan blade 2, and the filter element 4 is provided with a flow-through channel for air flow. The cross-section of the axial-flow fan blade 2 through which air can flow is the first cross-section, and the filter element covers the first cross-section to ensure the filtering effect.

[0037] The above double-click fan has the following effects: First, by arranging the axial-flow fan blade 2 and the centrifugal fan impeller 3 in sequence along the direction from the first-stage air inlet 11 to the air outlet 12, a filter element 4 is fixed on the axial-flow fan blade 2, and the filter element 4 is provided with a flow-through channel for air flow. When sucking oil fume, the external oil fume flows along the direction of its rotating shaft under the action of the axial-flow fan blade 2 and passes through the filter element 4. When the oil fume passes through the filter element 4, it is swept by the filter element 4, and the filter element 4 filters the oil in the oil fume. Thus, when the oil fume flows to the centrifugal fan impeller 3, since the oil in the air flow is basically filtered, the situation of oil stain adhesion on the centrifugal fan impeller 3 is greatly reduced, and the oil fume sucking effect and hygiene of the centrifugal fan impeller 3 are improved. Second, since the filter element 4 is fixed on the axial-flow fan blade 2 and can rotate with the axial-flow fan blade 2, the oil stain on the filter element 4 will be subjected to centrifugal force. Under the action of this force, the oil will be thrown onto the inner wall of the housing 1. In this way, after long-term use, the oil content on the filter element 4 is less, and it still has a good filtering effect, avoiding the problems of the filter element 4 needing to be replaced after being used for a period of time, high use cost, and poor experience. Third, after the oil is thrown onto the inner wall of the housing 1, it flows to the oil fume tank, and the user only needs to clean the oil stain in the oil fume tank, which is convenient to clean. Fourth, by selecting the axial-flow fan blade 2, compared with the centrifugal fan blade, the oil fume can flow stably along the direction of the blade rotating shaft, and there will be no turbulent flow at the position of the first-stage air inlet 11, and its oil fume sucking effect is good, which is beneficial to improving the oil fume sucking capacity. Since a filter element 4 is fixed on the axial-flow fan blade 2, its sucking capacity is relatively weak. Therefore, through the mutual cooperation of the axial-flow fan blade 2 and the centrifugal fan impeller 3, the sucking capacity of the entire fan is ensured, and the oil fume sucking effect is improved.

[0038] In practice, due to the gap between the axial flow fan blade 2 and the housing 1 or the gap between the filter element 4 and the housing 1 (which depends on the dimensions between the axial flow fan blade 2 and the filter element 4. In this embodiment, the size of the filter element 4 is larger than that of the axial flow fan blade 2, so the gap is between the filter element 4 and the housing 1), a small amount of oil fume can flow through this gap to the centrifugal fan impeller 3, which will reduce the filtering effect and affect the centrifugal fan impeller 3. Therefore, in this embodiment, refer to Figure 1 - Figure 3 , on the housing 1, a windshield ring 13 is provided outside the axial flow fan blade 2. In the axial direction of the rotating shaft of the axial flow fan blade 2, the windshield ring 13 blocks the gap between the axial flow fan blade 2 and the housing 1 or the gap between the filter element 4 and the housing 1. In this way, the oil fume basically cannot flow through the above-mentioned gap, and basically all the oil fume will be filtered to remove oil before flowing to the centrifugal fan impeller 3, which improves the filtering effect and ensures the suction effect.

[0039] Preferably, the windshield ring 13 completely blocks the gap between the axial flow fan blade 2 and the housing 1 or the gap between the filter element 4 and the housing 1.

[0040] Among them, refer to Figure 2 , the outer wall of the windshield ring 13 is in a hooked shape to form a wind guiding surface. In this way, when the oil fume flows to the outer wall of the windshield ring 13, the oil fume will flow along the wind guiding surface to the axial flow fan blade 2 and form a wind wall, which can further block the oil fume from flowing to the gap between the housing 1 and the filter element 4 and further improve the oil fume filtering effect.

[0041] Among them, refer to Figure 2 , an oil collecting groove 14 is provided inside the windshield ring 13. When the oil is thrown to the outer shell, it flows to the oil collecting groove 14 under its own gravity. When cleaning, only the oil stain in the oil collecting groove 14 needs to be cleaned, which is convenient for cleaning.

[0042] Furthermore, for the convenience of cleaning, an oil leakage hole 15 penetrating through to the oil collecting groove 14 is provided on the windshield ring 13, and the oil leakage hole 15 is arranged in the vertical direction. In this way, the oil in the oil collecting groove 14 automatically flows out through the oil leakage hole 15 under its own gravity.

[0043] In this embodiment, there are two filter elements 4, and the two filter elements 4 are respectively detachably connected to the inner and outer sides of the axial flow fan blade 2. In this way, the oil fume filtering effect is improved. In addition, one of the filter elements 4 is located outside the axial flow fan blade 2, which can first filter the oil fume and reduce the situation of oil fume adhering to the axial flow fan blade 2.

[0044] In this embodiment, the filter element 4 is in a mesh shape, and its mesh holes are in a strip shape. Specifically, the thickness of the filter element 4 is less than 0.4 mm, the width of the mesh wire is less than 0.4 mm, the included angle between the extension lines of two adjacent mesh wires is between 1° and 2°, and the pore area is at least twice the area of the second air inlet 31 of the centrifugal fan (or the diagonal flow mixed-flow fan). With such a setting, the filtering effect can be ensured, and at the same time, the rotational stability of the axial flow fan blade 2 can be ensured, avoiding problems such as poor filtering effect caused by too small thickness, too small width of the mesh wire, and too large included angle between two adjacent mesh wires, and also avoiding the problem that the filter element 4 is too large and affects the rotational stability of the axial flow fan blade 2. Of course, the filter element 4 can also be of other shapes. The cross-section through which the air can flow on the axial flow fan blade (that is, the cross-section formed by the blades on the axial flow fan blade during rotation) is the first cross-section, and the filter screen covers the first cross-section, which ensures the filtering effect.

[0045] In this embodiment, the filter element 4 is fixed on the axial flow fan blade 2 by bolts 5. Of course, other fixing methods can also be used. In order to improve the installation effect, a cover plate 6 can be provided on the filter element 4.

[0046] In this embodiment, the axial flow fan blade 2 and the centrifugal fan impeller 3 are driven to rotate by the motor shaft 71 of the same motor 7. In this way, the structure is simple, the cost is low, and at the same time, it is beneficial to reduce the volume of the fan and the range hood, which is convenient for actual installation and use.

[0047] Embodiment 2

[0048] A range hood includes a fan, wherein the fan is a two-stage fan with an oil removal function as described in Embodiment 1.

[0049] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A two-stage fan with an oil removal function, characterized in that: It includes a housing, axial flow fan blades and a centrifugal fan impeller. The housing is provided with a first-stage air inlet and an air outlet. The axial flow fan blades and the centrifugal fan impeller are arranged inside the housing and are sequentially arranged along the direction from the first-stage air inlet to the air outlet. A filter element is fixed on the axial flow fan blades, and the filter element is provided with a flow-through channel for air flow. The cross-section of the axial flow fan blades through which air can flow is a first cross-section, and the filter element covers the first cross-section.

2. The two-stage blower with an oil removal function according to claim 1, characterized in that: A wind shield ring is provided outside the axial flow fan blades on the housing. In the axial direction of the rotating shaft of the axial flow fan blades, the wind shield ring blocks the gap between the axial flow fan blades and the housing or the gap between the filter element and the housing.

3. The two-stage fan with an oil removal function according to claim 2, wherein: The wind shield ring completely blocks the gap between the axial flow fan blades and the housing or the gap between the filter element and the housing.

4. The two-stage fan with an oil removal function according to claim 2, characterized in that: The outer wall of the wind shield ring is in a hook shape to form a wind guiding surface.

5. The two-stage fan with an oil removal function according to claim 2, wherein: An oil collecting groove is arranged inside the wind shield ring.

6. The two-stage fan with an oil removal function according to claim 5, characterized in that: Oil leakage holes penetrating through to the oil collecting groove are arranged on the wind shield ring, and the oil leakage holes are arranged in the vertical direction.

7. The two-stage fan with an oil removal function according to any one of claims 1-5, characterized in that: There are two filter elements, and the two filter elements are respectively arranged on the inner and outer sides of the axial flow fan blades.

8. The two-stage fan with an oil removal function according to any one of claims 1-5, characterized in that: The filter element is in a mesh shape.

9. The two-stage fan with an oil removal function according to any one of claims 1-5, characterized in that: The axial flow fan blades and the centrifugal fan impeller are driven to rotate by the same motor shaft.

10. An oil fume extractor, comprising a fan, characterized in that: The fan is a two-stage fan with an oil removal function according to any one of claims 1-9.

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