Oil nozzle, centrifugal fan and range hood
By designing a sink structure in the oil nozzle of the range hood, increasing the surface area and oil conduction surface spacing, the aerodynamic noise problem caused by the oil leakage hole is solved, and lower noise propagation is achieved.
Patent Information
- Application Number
- CN202421606181.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-08
AI Technical Summary
In existing range hoods, the aerodynamic noise caused by the oil leakage hole is relatively high, affecting the silent effect of the equipment.
A oil nozzle is designed, including an oil conduction body and a sinking groove. The sinking groove is arranged corresponding to the oil leakage hole, which increases the surface area of the oil nozzle and the spacing between the oil conduction surface and the oil leakage hole, reduces the airflow impact flow rate and increases the noise radiation path.
By increasing the contact area between the airflow and the oil nozzle and extending the radiation path of the airflow, the noise intensity propagated by the oil nozzle is effectively reduced, and the aerodynamic noise problem caused by the oil leakage hole is improved.
Smart Images
Figure CN222925568U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of range hoods, and particularly relates to an oil nozzle, a centrifugal fan and a range hood. Background Art
[0002] In the prior art, a centrifugal fan is usually arranged in the inner cavity of a range hood and has a volute and a centrifugal impeller rotatably arranged in the volute. Through the high-speed rotation of the centrifugal impeller, not only can the oil fume be discharged from the air inlet of the range hood to the exhaust port, but also the grease in the oil fume can be separated under the action of centrifugal force. These greases separated inside the volute will flow naturally under the action of gravity to gather at the bottom of the volute, and flow through the oil leakage holes at the bottom to the oil nozzle below the volute, and then flow to the bottom of the range hood through the oil nozzle until flowing into the oil cup.
[0003] It can be understood that the oil leakage holes can not only allow the grease to flow through, but also become the channels for the air flow in the volute to penetrate out of the volute. The air flow leaking out from the oil leakage holes has a relatively high flow rate and thus generates relatively large aerodynamic noise. Summary of the Utility Model
[0004] The main purpose of the utility model is to propose an oil nozzle, a centrifugal fan and a range hood, aiming at improving the problem of large aerodynamic noise caused by the oil leakage holes.
[0005] To achieve the above purpose, the oil nozzle proposed by the utility model is applied to the volute of a centrifugal fan. The volute is provided with oil leakage holes. The oil nozzle includes:
[0006] An oil guiding main body, including a bottom plate and a side plate arranged on the side edge of the bottom plate. At least part of the side plate protrudes from the upper surface of the bottom plate. A sunken groove is formed on the upper surface of the bottom plate. The sunken groove corresponds to the oil leakage holes. An oil outlet is formed at the lower end of the sunken groove.
[0007] In an embodiment, in the axial direction of the oil leakage holes, the distance between the bottom surface of the sunken groove and the oil leakage holes ranges from 20 mm to 50 mm.
[0008] In an embodiment, the bottom plate and the sunken groove are integrally formed by stamping, and the sunken groove is formed by stretching from the bottom plate.
[0009] In an embodiment, in the direction close to the oil outlet, the upper surface of the bottom plate extends downward obliquely, and the bottom surface of the sunken groove extends obliquely in a direction away from the upper surface of the bottom plate.
[0010] In an embodiment, the included angle between the upper surface of the sunken groove and the upper surface of the bottom plate ranges from 5° to 25°.
[0011] In one embodiment, in the direction close to the oil outlet, the width of the bottom surface of the sinking groove is gradually decreased.
[0012] In one embodiment, there are two side plates, which are respectively arranged on opposite sides of the sinking groove and are spaced from the notch of the sinking groove. In the direction close to the oil outlet, the distance between the two side plates is gradually decreased.
[0013] In one embodiment, the oil nozzle further includes a baffle plate arranged on the oil guiding main body, and the baffle plate is spaced above the oil outlet.
[0014] In one embodiment, at one end of the bottom plate far from the oil outlet, an end plate is bent upward, and the end plate is adjacent to or abuts against the volute.
[0015] The present utility model also provides a centrifugal fan, including a volute and the aforementioned oil nozzle. The volute has an oil leakage hole, and the sinking groove of the oil nozzle is arranged corresponding to the oil leakage hole.
[0016] The present utility model also provides a range hood, including the aforementioned centrifugal fan.
[0017] The technical solution of the present utility model, by arranging a sinking groove on the bottom plate of the oil nozzle, is equivalent to increasing the surface area of the upper surface of the bottom plate, thereby increasing the impact contact area between the leakage air flow passing through the oil leakage hole and the oil nozzle, and increasing the radiation path of the noise, so as to reduce the intensity of the noise transmitted from the oil nozzle. Secondly, forming a sinking groove by downward depression on the basis of the plate surface of the bottom plate is equivalent to increasing the distance between the oil leakage hole and the oil guiding surface of the oil nozzle (i.e., the bottom surface of the sinking groove), thereby being able to reduce the flow velocity of the leakage air flow when it impacts on the oil guiding surface, and reducing the noise caused by the impact. Furthermore, after the leakage air flow enters the sinking groove, it will generate multiple impacts and reflections between the two side walls of the sinking groove to consume kinetic energy, thereby being able to reduce the flow velocity of the leakage air flow when it flows out of the oil nozzle, and thus being able to reduce the aerodynamic noise brought by the leakage air flow. In this way, the problem of large aerodynamic noise caused by the oil leakage hole is improved from multiple aspects. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the structures shown in these drawings.
[0019] Figure 1 It is a partial structural schematic diagram of an embodiment of the centrifugal fan provided by the present utility model;
[0020] Figure 2 The front view of the structure shown Figure 1 ;
[0021] Figure 3 The sectional view taken along line A-A in Figure 1 ;
[0022] Figure 4 The schematic structural diagram of the nozzle in Figure 1 at a lateral upward viewing angle;
[0023] Figure 5 The schematic structural diagram of the nozzle in Figure 1 at a lateral downward viewing angle.
[0024] Explanation of the reference numerals in the drawings:
[0025] 10. Nozzle; 101. Oil outlet; 11. Oil guiding main body; 111. Bottom plate; 112. Side plate; 113. Sunk groove; 115. End plate; 12. Baffle; 13. Installation flange;
[0026] 20. Volute; 21. Oil leakage hole; 22. Main air inlet; 23. Auxiliary air inlet; 24. Air outlet.
[0027] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners
[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.
[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0030] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0031] In the prior art, a centrifugal fan is usually disposed in the inner cavity of a range hood and has a volute and a centrifugal impeller rotatably disposed in the volute. Through the high-speed rotation of the centrifugal impeller, not only can the oil fume be discharged from the air inlet of the range hood to the smoke exhaust port, but also the grease in the oil fume can be separated under the action of centrifugal force. These greases separated inside the volute will flow naturally under the action of gravity, flow to and gather at the bottom of the volute, and flow through the oil leakage holes at the bottom to the oil nozzle below the volute, and then flow to the bottom of the range hood through the oil nozzle until flowing into the oil cup.
[0032] It can be understood that the oil leakage holes can not only allow the grease to flow through, but also become the channels for the air flow inside the volute to penetrate out of the volute. The air flow leaking out from the oil leakage holes has a relatively high flow rate and thus generates a relatively large pneumatic noise.
[0033] In view of this, the present utility model provides an oil nozzle, a centrifugal fan and a range hood. Among them, the oil nozzle is applied to the volute of the centrifugal fan, and the oil nozzle can improve the problem of large pneumatic noise caused by the oil leakage holes.
[0034] Without loss of generality, the range hood includes a housing having a fume inlet, a fume outlet and a smoke passage communicating between the fume inlet and the fume outlet. The centrifugal fan is disposed in the smoke passage, and the air inlet of the centrifugal fan is communicated with the fume inlet, and the air outlet of the centrifugal fan is communicated with the fume outlet. The centrifugal fan is usually installed in the range hood in a substantially horizontal posture, that is, the axial directions of the centrifugal fan and the volute are parallel or substantially parallel to the horizontal plane.
[0035] It can be understood that the number of air inlets of the centrifugal fan can be either one or two, that is, the centrifugal fan can be provided with air inlets on both opposite end faces. For example, please refer to Figures 1 to 3, in one embodiment, main air inlets 22 and auxiliary air inlets 23 are respectively provided at opposite ends of the volute 20. The auxiliary air inlet 23 is adjacent to the rear end plate of the casing (not shown in the drawings) and forms an auxiliary air inlet passage (not shown in the drawings) at an interval from the rear end plate. A main air inlet passage (not shown in the drawings) is formed at an interval between the main air inlet 22 and the front end plate of the casing (not shown in the drawings). At this time, most of the oil fume can flow from the oil fume inlet through the main air inlet passage, the main air inlet 22 and into the volute 20, and a small part of the oil fume can flow from the oil fume inlet through the auxiliary air inlet passage, the auxiliary air inlet 23 and into the volute 20. Of course, in other embodiments, the auxiliary air inlet 23 and the auxiliary air inlet passage may not be provided, or the main air inlet 22 and the main air inlet passage are located on the rear end face of the volute 20.
[0036] Please refer to Figures 3 to 5 , in one embodiment of the present invention, the oil nozzle 10 includes:
[0037] An oil guiding main body 11, including a bottom plate 111 and side plates 112 provided at the side edges of the bottom plate 111. At least part of the side plates 112 protrudes above the upper surface of the bottom plate 111. A sunken groove 113 is formed in the upper surface of the bottom plate 111. The sunken groove 113 is provided corresponding to the oil leakage hole 21, and an oil outlet 101 is formed at the lower end of the sunken groove.
[0038] In the technical solution of the present invention, by providing the sunken groove 113 on the bottom plate 111 of the oil nozzle 10, it is equivalent to increasing the surface area of the upper surface of the bottom plate 111, thereby increasing the impact contact area between the leakage air flow passing through the oil leakage hole 21 and the oil nozzle 10, and increasing the radiation path of the noise, so as to reduce the intensity of the noise transmitted from the oil nozzle 10. Secondly, by forming the sunken groove 113 by recessing downward on the basis of the plate surface of the bottom plate 111, it is equivalent to increasing the distance between the oil leakage hole 21 and the oil guiding surface (i.e., the bottom surface of the sunken groove) of the oil nozzle 10, thereby being able to reduce the flow velocity of the leakage air flow when it impacts on the oil guiding surface, and reducing the noise caused by the impact. Furthermore, after the leakage air flow enters the sunken groove 113, multiple impacts and reflections will occur between the two groove side walls of the sunken groove 113 to consume kinetic energy, thereby being able to reduce the flow velocity of the leakage air flow when it flows out of the oil nozzle 10, and thus being able to reduce the pneumatic noise brought by the leakage air flow. In this way, the problem of large pneumatic noise caused by the oil leakage hole 21 is improved from multiple levels.
[0039] It can be understood that if the air flow leaking from the oil leakage hole 21 directly flows into the main air inlet passage of the range hood, it will interfere with the air flow in the main air inlet passage, thereby affecting the smoke exhaust effect of the range hood and increasing the overall noise of the range hood.
[0040] Therefore, please refer to Figures 3 to 5, in the embodiment of the present utility model, optionally, the upper surface of the bottom plate 111 and the bottom surface of the sunken groove 113 extend downwardly and obliquely in the direction of the independent air inlet 22 towards the secondary air inlet 23, that is, the oil outlet 101 is located at one end of the oil nozzle 10 close to the secondary air inlet 23. In this way, not only can the liquid collected on the oil nozzle 10 be guided to the side away from the main air inlet passage, so as to avoid the problem that the liquid dripping from the oil nozzle 10 drifts or splashes arbitrarily under the influence of the airflow in the main air inlet passage, but also the leakage airflow leaking from the oil leakage hole 21 can be guided to the side away from the main air inlet passage, so as to avoid the problem that the leakage airflow interferes with the air flow in the main air inlet passage, thereby ensuring the smoke extraction effect of the range hood and reducing its overall noise.
[0041] It should be noted that in the embodiment of the present utility model, the liquid includes but is not limited to grease or water or a mixture of oil and water. For example, when the centrifugal fan is applied to a range hood with a steam cleaning function, the volute 20 can also collect the sewage (i.e., a mixture of oil and water) after steam cleaning, and at this time, the sewage can flow into the oil nozzle 10 through the oil leakage hole 21.
[0042] Optionally, the oil fume inlet is located at the lower side of the volute 20, and the secondary air inlet passage is located at the upper end of the volute 20, that is, the secondary air inlet passage is located above the oil nozzle 10. Then, the leakage airflow derived from the oil outlet 101 of the oil nozzle 10 will not only not interfere with the air flow in the secondary air inlet passage, but also can enter the volute 20 again from the secondary air inlet 23 under the negative pressure action of the secondary air inlet passage.
[0043] Of course, in other embodiments, it may also be that in the direction from the secondary air inlet 23 towards the main air inlet 22, the upper surface of the bottom plate 111 and the bottom surface of the sunken groove 113 extend downwardly and obliquely, or the upper surface of the bottom plate 111 and the bottom surface of the sunken groove 113 first extend downwardly and obliquely and then upwardly and obliquely. At this time, the oil outlet 101 is located at the lowest position in the middle of the bottom plate 111 and the sunken groove 113.
[0044] Please refer to Figure 3, optionally, in the axial direction of the oil leakage hole 21, the distance D between the bottom surface of the sinking groove 113 and the oil leakage hole 21 ranges from 20 mm to 50 mm. Specifically, optionally, the range is from 30 mm to 40 mm, such as 35 mm or 38 mm, etc. That is, most of the leakage air flow flowing out of the oil leakage hole 21 needs to pass through a gap of 20 mm to 50 mm before reaching the bottom surface of the sinking groove 113 (i.e., the oil guiding surface of the oil nozzle 10). In this way, the flow velocity of the leakage air flow when impacting on the sinking groove 113 can be reduced, and the noise caused by the impact can be reduced. It can be understood that if the value of this distance is too large, on the premise of meeting a certain inclination angle of the oil nozzle 10, it will lead to a larger height dimension of the oil nozzle 10 and a larger installation space occupied, which is not conducive to the miniaturization design of the range hood. Of course, in other embodiments, the value of the distance between the bottom surface of the sinking groove 113 and the oil leakage hole 21 can also be other numerical ranges.
[0045] Optionally, the oil leakage hole 21 is provided at the bottom of the volute 20 and penetrates through the side wall of the volute 20 in the up and down direction, and the sinking groove 113 is located below the oil leakage hole 21. In this embodiment, the axial direction of the oil leakage hole 21 is the up and down direction, that is, the distance D between the bottom surface of the sinking groove 113 and the oil leakage hole 21 in the up and down direction ranges from 20 mm to 50 mm.
[0046] Optionally, the bottom plate 111 and the sinking groove 113 are integrally formed by stamping, and the sinking groove 113 is drawn and formed from the bottom plate 111. That is, the bottom plate 111 is used as the reference plane for the drawing and forming of the sinking groove 113. In this way, the structure is simple and easy to form, and the assembly or fixing steps of the bottom plate 111 and the sinking groove 113 can be saved. Secondly, since the sinking groove 113 is further drawn and formed on the basis of the bottom plate 111, compared with the oil nozzle with a bottom plate of the same width, the oil nozzle of this embodiment does not need to additionally increase the stamping blanking size, thus saving the blanking cost. Of course, in other embodiments, the bottom plate 111 and the sinking groove 113 can also be separately provided and assembled and fixed together by means of screwing, riveting or welding.
[0047] Please refer to Figure 3 and Figure 4, optionally, in the direction close to the oil outlet 101, the upper surface of the bottom plate 111 extends obliquely downward, and the bottom surface of the sinking groove 113 extends obliquely away from the upper surface of the bottom plate 111. That is, taking the bottom plate 111 as the reference plane for the drawing forming of the sinking groove 113, the drawing depth of the sinking groove 113 gradually increases from top to bottom. Thus, when the nozzle 10 is applied to a centrifugal fan, the inclination angle of the bottom surface of the sinking groove 113 relative to the horizontal plane is larger, which is more conducive to guiding the liquid and air flow to the oil outlet 101. Of course, in other embodiments, the bottom surface of the sinking groove 113 may also be arranged parallel to the upper surface of the bottom plate 111, or, in the direction close to the oil outlet 101, the bottom surface of the sinking groove 113 extends obliquely toward the upper surface of the bottom plate 111.
[0048] Please refer to Figure 3 , optionally, the included angle θ between the bottom surface of the sinking groove 113 and the upper surface of the bottom plate 111 ranges from 5° to 25°, specifically optionally, the range is from 10° to 20°, such as 12°, 15° or 18°. It can be understood that if the included angle θ is too large, on the one hand, the distance between the upper end of the bottom surface of the sinking groove 113 and the oil leakage hole 21 is too small, which is not conducive to weakening the flow velocity of the leakage air flow to reduce the pneumatic noise; on the other hand, it will cause the drawing depth of the lower end of the sinking groove 113 to be too large and prone to problems such as cracks. If the included angle θ is too small, the inclination angle of the bottom surface of the sinking groove 113 relative to the horizontal plane is not large enough, which is not conducive to guiding the liquid and air flow to the oil outlet 101.
[0049] Please refer to Figure 2 and Figure 5 , in the direction close to the oil outlet 101, the width of the bottom surface of the sinking groove 113 is gradually decreased. Thus, it is beneficial for the liquid in the sinking groove 113 to gather into larger droplets (such as water droplets, oil droplets or oil-water mixed droplets) more quickly, thereby improving the fluidity of the droplets and facilitating the rapid discharge of the droplets. Of course, in other implementations, in the direction close to the oil outlet 101, the width of the bottom surface of the sinking groove 113 may also be unchanged or gradually increased.
[0050] Please refer to Figure 5 , optionally, there are two side plates 112, and the two side plates 112 are respectively arranged on the opposite sides of the sinking groove 113 and are spaced from the groove opening of the sinking groove 113. In the direction close to the oil outlet 101, the distance between the two side plates 112 is gradually decreased. Thus, there are side plates 112 on both sides of the sinking groove 113, which can increase the structural strength of the oil guiding main body 11. Of course, in other embodiments, only one side plate 112 may also be provided.
[0051] Please refer to Figure 1 and Figure 5, Further, the nozzle 10 further includes a baffle 12 provided on the oil guiding main body 11, and the baffle 12 is spaced above the oil outlet 101. In this way, the baffle 12 can play a certain role in blocking the leakage air flow and noise, and can increase the aerodynamic resistance in the spaced space between the nozzle 10 and the volute 20, thereby reducing the leakage amount of the leakage air flow flowing out of the oil leakage hole 21 of the volute 20, and further reducing the interference degree of the leakage air flow on the air flow in the main air inlet passage and the aerodynamic noise. Of course, in other embodiments, the baffle 12 may not be provided.
[0052] Please refer to Figure 2 and Figure 4 , Further, one end of the bottom plate 111 away from the oil outlet 101 is bent upward to form an end plate 115, and the end plate 115 is adjacent to or abuts against the volute 20. That is, the end plate 115 is located at one end of the oil guiding main body 11 close to the main air inlet 22, and the clearance value range between the end plate 115 and the volute 20 is 0.5 mm to 3 mm. In this way, the problem of leakage air flow and noise flowing from the nozzle 10 to the main air inlet passage can be further improved, and it is convenient to install and fix the nozzle 10 on the volute 20.
[0053] Of course, in other embodiments, the end plate 115 may not be provided, or the clearance value range between the end plate 115 and the volute 20 is other numerical ranges, such as 10 mm to 30 mm. At this time, although there is a large clearance between the end plate 115 and the front end face of the volute 20, due to the existence of the sinking groove 113, most of the leakage air flow flows downward and backward, and even if a small amount of leakage air flow flows through this clearance to the main air inlet passage, it will not cause great interference to the air flow in the main air inlet passage.
[0054] Please refer to Figure 1 , Figure 2 and Figure 4 , Further, an installation flange 13 is bent on the upper side edge of the end plate 115, and the installation flange 13 is connected to one end face of the volute 20 through a fastener, and the baffle 12 is connected to the other end face of the volute 20 through a fastener. In this way, the installation structure is simple and easy to implement. Of course, in other embodiments, the baffle 12 may not play a role in installation and fixation, or the installation flange 13 may not be provided and only rely on the baffle 12 for installation and fixation.
[0055] Optionally, the bottom plate 111, the sinking groove 113, the side plate 112, the end plate 115 and the baffle 12 are integrally formed by stamping. The side plate 112 is bent and formed from the side edge of the bottom plate 111, and the end plate 115 is bent and formed from the end edge of the bottom plate 111. In this way, the structure is simple and easy to implement. Of course, in other embodiments, at least one of the bottom plate 111, the sinking groove 113, the side plate 112, the end plate 115 and the baffle 12 may be separately provided, and the separate parts are assembled and fixed to other parts by screwing, riveting or welding.
[0056] It can be understood that the oil guiding main body 11, the side plate 112 and the end plate 115 together play a certain degree of sealing effect to prevent the leakage air flow blown out from the oil leakage hole 21 from directly flowing to the main air inlet channel, thereby reducing the interference effect of the leakage air flow on the air flow in the main air inlet channel and playing a role in noise reduction. At the same time, the sealing effect can also weaken the outward radiation of noise and is also beneficial to reducing the overall noise of the range hood.
[0057] The present utility model also provides a centrifugal fan, which includes a volute and an oil nozzle. The specific structure of the oil nozzle refers to the above embodiments. Since this centrifugal fan adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the volute has an oil leakage hole, and the sinking groove of the oil nozzle corresponds to the oil leakage hole.
[0058] The present utility model also provides a range hood, which includes the aforementioned centrifugal fan. The centrifugal fan includes a volute and an oil nozzle. The specific structure of the oil nozzle refers to the above embodiments. Since this range hood adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.
[0059] The above are only exemplary embodiments of the present utility model and do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.
Claims
1. An oil nozzle, applied to a volute of a centrifugal fan, wherein the volute is provided with an oil leakage hole, characterized in that: The oil nozzle comprises: The oil guide body includes a bottom plate and a side plate arranged at the side edge of the bottom plate, wherein the side plate at least partially protrudes from the upper surface of the bottom plate, and a groove is recessed on the upper surface of the bottom plate. The groove is arranged corresponding to the oil leakage hole, and an oil outlet is formed at the lower end of the groove.
2. The grease nozzle according to claim 1, characterized in that: In the axial direction of the oil leakage hole, the distance between the bottom surface of the sink groove and the oil leakage hole ranges from 20 mm to 50 mm.
3. The grease nozzle according to claim 1, characterized in that: The bottom plate and the sink are integrally formed by stamping, and the sink is formed by drawing from the bottom plate.
4. The grease nozzle according to claim 1, characterized in that: In a direction close to the oil outlet, the upper surface of the bottom plate extends obliquely downward, and the bottom surface of the sink groove extends obliquely in a direction away from the upper surface of the bottom plate.
5. The grease nozzle according to claim 4, characterized in that: The angle between the upper surface of the sink and the upper surface of the bottom plate ranges from 5° to 25°.
6. The grease nozzle according to claim 1, characterized in that: In the direction approaching the oil outlet, the width of the bottom surface of the sink groove is gradually reduced.
7. The grease nozzle according to claim 6, characterized in that: There are two side plates, which are respectively arranged on opposite sides of the sink and spaced apart from the notch of the sink. In the direction approaching the oil outlet, the distance between the two side plates is gradually reduced.
8. The grease nozzle according to claim 1, characterized in that: The oil nozzle further comprises a baffle plate arranged on the oil guide body, and the baffle plate is arranged above the oil outlet at intervals; And / or, the bottom plate is bent upward to form an end plate at one end away from the oil outlet, and the end plate is adjacent to or abuts against the volute.
9. A centrifugal fan, characterized in that: It comprises a volute, and an oil nozzle as claimed in any one of claims 1 to 8, wherein the volute has an oil leakage hole, and the sink groove of the oil nozzle is arranged corresponding to the oil leakage hole.
10. A range hood, characterized in that: Comprising the centrifugal fan as claimed in claim 9.