Oil nozzle, centrifugal fan and range hood
By designing the boss and groove structure in the oil nozzle of the range hood, the aerodynamic noise problem caused by the oil leakage hole is solved, and a better silent effect is achieved.
Patent Information
- Application Number
- CN202421608461.2
- 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, a boss and a groove. The boss is arranged according to the oil leakage hole to increase the contact area between the airflow and the oil nozzle, and the airflow is caused to generate multiple shocks and reflections through the groove, consuming kinetic energy, thereby reducing the flow rate and noise of the airflow.
By increasing the contact area between the airflow and the oil nozzle and consuming the air flow energy, the aerodynamic noise caused by the oil leakage hole is effectively reduced, and the silent effect of the range hood is improved.
Smart Images
Figure CN222925572U_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 the bottom of the volute and gather there, and then flow through the oil leakage hole 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 it flows into the oil cup.
[0003] It can be understood that the oil leakage hole can not only allow the grease to flow through, but also become a channel for the air flow in the volute to pass through the volute. The air flow leaking out from the oil leakage hole has a relatively high flow rate and thus generates a relatively large pneumatic noise. Summary of the Utility Model
[0004] The main purpose of the utility model is to provide an oil nozzle, a centrifugal fan and a range hood, aiming to improve the problem of large pneumatic noise caused by the oil leakage hole.
[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 an oil leakage hole. The oil nozzle includes:
[0006] An oil guiding main body, one end of the oil guiding main body forms an oil outlet, and includes a bottom plate and side plates arranged on the side edges of the bottom plate. A convex platform is convexly arranged on the upper surface of the bottom plate, and the convex platform corresponds to the oil leakage hole; at least part of the side plates protrude from the upper surface of the bottom plate, and a groove is formed at an interval between the inner side surface of the side plates and the side surface of the convex platform. The oil outlet is arranged on the upper surface of the bottom plate and / or the convex platform.
[0007] In an embodiment, in the axial direction of the oil leakage hole, the distance between the top surface of the convex platform and the oil leakage hole ranges from 5 mm to 30 mm.
[0008] In an embodiment, the bottom plate and the convex platform are integrally formed by stamping, and the convex platform 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 upper surface of the convex platform extends obliquely in the direction close to the upper surface of the bottom plate.
[0010] In one embodiment, the included angle between the upper surface of the boss and the upper surface of the bottom plate ranges from 3° to 15°.
[0011] In one embodiment, the oil outlet is provided on the upper surfaces of the bottom plate and the boss, and the lower end of the groove communicates with the oil outlet.
[0012] In one embodiment, the oil nozzle further includes a baffle provided on the oil guiding body. The lower side surface of the baffle is spaced from the upper surface of the bottom plate and the upper surface of the boss, and at least part of the oil outlet is formed by the spacing.
[0013] In one embodiment, there are two grooves. The two grooves are respectively arranged on opposite sides of the boss, and the distance between the two grooves gradually decreases in the direction close to the oil outlet.
[0014] In one embodiment, the upper side edge of the side plate is bent with a shielding flange, and the gap between the shielding flange and the side surface of the volute is 0.5 mm to 3 mm.
[0015] In one embodiment, at one end of the bottom plate away from the oil outlet, an end plate is bent upward, and the end plate is adjacent to or abuts against the volute.
[0016] The present invention also provides a centrifugal fan, including a volute and the aforementioned oil nozzle. The volute has an oil leakage hole, and the boss of the oil nozzle is arranged corresponding to the oil leakage hole.
[0017] The present invention also provides a range hood, including the aforementioned centrifugal fan.
[0018] In the technical solution of the present invention, by providing a boss on the bottom plate of the oil nozzle, it 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, after the leakage air flow enters the groove, it will generate multiple impacts and reflections between the two side surfaces of the groove to consume kinetic energy, thereby being able to reduce the flow velocity of the leakage air flow when flowing 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 levels. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0020] Figure 1 Partial structural schematic diagram of an embodiment of the centrifugal fan provided by the present utility model;
[0021] Figure 2 is Figure 1 The front view of the structure shown;
[0022] Figure 3 is Figure 2 The sectional view taken along A-A in
[0023] Figure 4 is Figure 1 The structural schematic diagram of the oil nozzle in at the lateral upward viewing angle;
[0024] Figure 5 is Figure 1 The structural schematic diagram of the oil nozzle in at the lateral downward viewing angle.
[0025] Explanation of the reference numerals in the drawings:
[0026] 10. Oil nozzle; 101. Oil outlet; 102. Groove; 11. Oil guiding main body; 111. Bottom plate; 112. Side plate; 113. Boss; 114. Blocking flange; 115. End plate; 12. Baffle; 13. Mounting flange;
[0027] 20. Volute; 21. Oil leakage hole; 22. Main air inlet; 23. Auxiliary air inlet; 24. Air outlet.
[0028] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments
[0029] 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 belong to the scope of protection of the present utility model.
[0030] 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.
[0031] In addition, if descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood 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, or 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 cannot 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.
[0032] 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 cooking fumes be discharged from the air inlet of the range hood to the exhaust port, but also the grease in the cooking fumes 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 they flow into the oil cup.
[0033] 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 relatively large aerodynamic noise.
[0034] 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 this oil nozzle can improve the problem of large aerodynamic noise caused by the oil leakage holes.
[0035] Without loss of generality, the range hood includes a housing having a smoke inlet, a smoke outlet and a smoke passage communicating between the smoke inlet and the smoke outlet. The centrifugal fan is disposed in the smoke passage, and the air inlet of the centrifugal fan is communicated with the smoke inlet, and the air outlet of the centrifugal fan is communicated with the smoke outlet. The centrifugal fan is usually installed in the range hood in a generally horizontal posture, that is, the axial directions of the centrifugal fan and the volute are parallel or substantially parallel to the horizontal plane.
[0036] 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 arranged 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. The main air inlet 22 forms a main air inlet passage (not shown in the drawings) at an interval from the front end plate of the casing (not shown in the drawings). At this time, most of the oil fume can flow from the smoke 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 smoke 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.
[0037] Please refer to Figures 3 to 5 , in one embodiment of the present utility model, the oil nozzle 10 includes:
[0038] An oil guiding main body 11, one end of the oil guiding main body 11 forms an oil outlet 101, and includes a bottom plate 111 and side plates 112 arranged on the side edges of the bottom plate 111. A convex platform 113 is convexly provided on the upper surface of the bottom plate 111, and the convex platform 113 is arranged corresponding to the oil leakage hole 21; at least part of the side plates 112 protrudes from the upper surface of the bottom plate 111, and a groove 102 is formed at an interval between the inner side surface of the side plates 112 and the side surface of the convex platform 113, and the oil outlet 101 is arranged on the upper surface of the bottom plate 111 and / or the convex platform 113.
[0039] In the technical solution of the present utility model, by providing the convex platform 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, after the leakage air flow enters the groove 102, multiple impacts and reflections will occur between the two groove side surfaces of the groove 102 to consume kinetic energy, thereby being able to reduce the flow velocity of the leakage air flow when flowing out of the oil nozzle 10, 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 21 is improved from multiple levels.
[0040] It can be understood that if the air flow leaking from the oil leakage hole 21 directly flows to 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.
[0041] Therefore, please refer to Figures 3 to 5, in the embodiment of the present utility model, optionally, the bottom plate 111 and the convex platform 113 extend downward 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 air flow in the main air inlet passage, but also the leakage air flow leaking out 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 air flow interferes with the air flow in the main air inlet passage, thereby ensuring the smoking effect of the range hood and reducing its overall noise.
[0042] 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.
[0043] Optionally, the smoke 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 air flow led out 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 of the secondary air inlet passage.
[0044] Of course, in other embodiments, it can also be that the bottom plate 111 and the convex platform 113 extend downward obliquely in the direction from the secondary air inlet 23 towards the main air inlet 22, or the bottom plate 111 and the convex platform 113 first extend downward obliquely and then upward obliquely. At this time, the oil outlet 101 is located at the lowest position in the middle of the bottom plate 111 and the convex platform 113.
[0045] Please refer to Figure 3 , optionally, in the axial direction of the oil leakage hole 21, the distance D between the top surface of the convex platform 113 and the oil leakage hole 21 ranges from 5 mm to 30 mm. Specifically, optionally, the range is from 10 mm to 20 mm, such as 15 mm or 18 mm, etc. That is, most of the leakage air flow flowing out from the oil leakage hole 21 needs to pass through a gap of 10 mm to 20 mm before reaching the top surface of the convex platform 113. In this way, the flow rate of the leakage air flow when it impacts on the convex platform 113 can be reduced, and the noise caused by the impact can be reduced. It can be understood that if the distance value is too large, on the premise of ensuring that the oil nozzle 10 has a certain inclination angle, it will cause the height dimension of the oil nozzle 10 to be larger and the occupied installation space to be larger, which is not conducive to the miniaturization design of the range hood. Of course, in other embodiments, the distance value between the top surface of the convex platform 113 and the oil leakage hole 21 can also be other value ranges.
[0046] 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 boss 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 top surface of the boss 113 and the oil leakage hole 21 in the up and down direction ranges from 5 mm to 30 mm.
[0047] Optionally, the bottom plate 111 and the boss 113 are integrally formed by stamping, and the boss 113 is formed by drawing from the bottom plate 111. That is, the bottom plate 111 is used as the reference plane for the drawing formation of the boss 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 boss 113 can be saved. Of course, in other embodiments, the bottom plate 111 and the boss 113 may also be separately provided and assembled and fixed together by means of screwing, riveting or welding.
[0048] 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 upper surface of the boss 113 extends obliquely in the direction close to the upper surface of the bottom plate 111. That is, with the bottom plate 111 as the reference plane for the drawing formation of the boss 113, the drawing depth of the boss 113 gradually decreases from top to bottom. Correspondingly, in the direction close to the oil outlet 101, the groove depth of the groove 102 gradually decreases. In this way, the upper surfaces of both the bottom plate 111 and the boss 113 can play a good guiding role to guide the liquid and air flow to the end where the oil outlet 101 is located. Secondly, when the nozzle 10 is applied to a centrifugal fan, the inclination angle of the upper surface of the boss 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 upper surface of the boss 113 may also be parallel to the upper surface of the bottom plate 111, or in the direction close to the oil outlet 101, the upper surface of the boss 113 extends obliquely away from the upper surface of the bottom plate 111.
[0049] Please refer to Figure 3 , optionally, the included angle θ between the upper surface of the boss 113 and the upper surface of the bottom plate 111 ranges from 3° to 15°, specifically optionally, the range is from 5° to 10°, such as 6° or 8°. 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 upper surface of the boss 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 upper end of the boss 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 upper surface of the boss 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.
[0050] Please refer to Figure 1and Figure 4 , optionally, the oil outlet 101 is provided on the upper surfaces of the bottom plate 111 and the boss 113, and the lower end of the groove 102 communicates with the oil outlet 101. That is, the groove 102 can also collect the liquid flowing from the upper surface of the boss 113 to the side and guide these liquids to the oil outlet 101. Thus, the groove 102 and the boss 113 simultaneously serve as oil guiding structures, that is, the upper surfaces of the bottom plate 111 and the boss 113 simultaneously serve as oil guiding surfaces, which is conducive to quickly draining the liquid on the nozzle 10. Of course, in other embodiments, the lower end of the groove 102 may be separately arranged from the oil outlet 101.
[0051] Please refer to Figure 2 and Figure 5 , in the direction close to the oil outlet 101, the width of the upper surface of the boss 113 is gradually reduced. In this way, it is not only conducive to making the liquid on the boss 113 converge into larger droplets (such as water droplets, oil droplets or oil-water mixed droplets) more quickly, and more of them can flow into the groove 102 to converge into larger droplets, thereby improving the fluidity of the droplets and facilitating the rapid drainage of the droplets. Of course, in other implementations, in the direction close to the oil outlet 101, the width of the upper surface of the boss 113 may remain unchanged or gradually increase.
[0052] Please refer to Figure 5 , in order to further improve the oil guiding effect of the nozzle 10, optionally, there are two grooves 102, and the two grooves 102 are respectively arranged on opposite sides of the boss 113. In the direction close to the oil outlet 101, the distance between the two grooves 102 is gradually reduced. In this way, there are grooves 102 on both sides of the boss 113, enabling the liquid on the nozzle 10 to converge together faster.
[0053] 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. The lower side surface of the baffle 12 is spaced from the upper surface of the bottom plate 111 and the upper surface of the boss 113, and at least part of the oil outlet 101 is formed by the spacing. That is, the baffle 12 is provided 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 from 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.
[0054] Please refer to Figure 2 and Figure 5, on the basis that a baffle 12 is provided above the oil outlet 101, in order to prevent a large amount of leaked air flow and noise from flowing out through the gap between the side plate 112 and the volute 20. Further, a shielding flange 114 is bent at the upper side edge of the side plate 112, and the gap between the shielding flange 114 and the side surface of the volute 20 is 0.5 mm to 3 mm, for example, taking a value of 0.5 mm or 1 mm. It can be understood that if the value of this gap is too small, it is still easy to have problems with difficult assembly between the nozzle 10 and the volute 20 within the range of manufacturing tolerances and assembly tolerances; if the value of this gap is too large, the blocking effect of the shielding flange 114 is very limited.
[0055] In this way, the shielding flange 114 can partially shield the gap between the side plate 112 and the volute 20, thereby avoiding the problem that after the leaked air flow is blocked by the baffle 12, it turns to flow out in large quantities through the gap between the side plate 112 and the volute 20, so that the aerodynamic resistance in the spaced space between the nozzle 10 and the volute 20 can be further increased, thereby reducing the leakage amount of the leaked air flow flowing out from the oil leakage hole 21 of the volute 20, and further reducing the degree of interference of the leaked air flow on the air flow in the main air inlet passage and the aerodynamic noise.
[0056] Please refer to Figure 2 and Figure 4 , further, at one end of the bottom plate 111 away from the oil outlet 101, an end plate 115 is bent upward, 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 gap between the end plate 115 and the volute 20 ranges from 0.5 mm to 3 mm. In this way, the problem of leaked 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.
[0057] Of course, in other embodiments, the end plate 115 may not be provided, or the gap between the end plate 115 and the volute 20 ranges from other numerical ranges, for example, taking a value of 10 mm to 30 mm. At this time, although there is a large gap between the end plate 115 and the front end face of the volute 20, due to the presence of the boss 113, most of the leaked air flow flows downward and backward, and even if a small amount of leaked air flow flows to the main air inlet passage through this gap, it will not cause great interference to the air flow in the main air inlet passage.
[0058] Please refer to Figure 1 , Figure 2 and Figure 4, Further, an installation flange 13 is bent from the upper side edge of the end plate 115. The installation flange 13 is connected to one end face of the volute 20 through fasteners, and the baffle 12 is connected to the other end face of the volute 20 through fasteners. In this way, the installation structure is simple and easy to implement. Of course, in other embodiments, the baffle 12 may not play the role of installation and fixation, or the installation flange 13 may not be provided and only rely on the baffle 12 for installation and fixation.
[0059] Optionally, the bottom plate 111, the boss 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 boss 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.
[0060] 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 passage, thereby reducing the interference effect of the leakage air flow on the air flow in the main air inlet passage and playing a role in noise reduction. At the same time, the sealing effect can also weaken the outward radiation of noise, which is also beneficial to reducing the overall noise of the range hood.
[0061] 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 boss of the oil nozzle is arranged corresponding to the oil leakage hole.
[0062] 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.
[0063] 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 direct / indirect application 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: An oil guide body, one end of which is formed with an oil outlet, and comprises a bottom plate, a side plate arranged at the side edge of the bottom plate, the upper surface of the bottom plate is provided with a boss, and the boss is arranged corresponding to the oil leakage hole; the side plate at least partially protrudes from the upper surface of the bottom plate, and a groove is formed between the inner side surface of the side plate and the side surface of the boss, and the oil outlet is arranged on the upper surface of the bottom plate and / or the boss.
2. The grease nozzle according to claim 1, characterized in that: In the axial direction of the oil leakage hole, the distance between the top surface of the boss and the oil leakage hole ranges from 5 mm to 30 mm.
3. The grease nozzle according to claim 1, characterized in that: The bottom plate and the boss are integrally formed by stamping, and the boss is drawn 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 upper surface of the boss extends obliquely in a direction close to 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 boss and the upper surface of the base plate ranges from 3° to 15°.
6. The grease nozzle according to claim 1, characterized in that: The oil outlet is arranged on the upper surfaces of the bottom plate and the boss, and the lower end of the groove is connected to the oil outlet.
7. The grease nozzle according to claim 6, characterized in that: The oil nozzle further comprises a baffle plate provided on the oil guide body, the lower side of the baffle plate is spaced apart from the upper surface of the bottom plate and the upper surface of the boss, and at least a part of the oil outlet is formed at intervals; And / or, there are two grooves, which are respectively arranged on opposite sides of the boss, and the distance between the two grooves is gradually reduced in the direction approaching the oil outlet.
8. The grease nozzle according to claim 1, characterized in that: The upper side edge of the side plate is bent to form a shielding flange, and the gap between the shielding flange and the side surface of the volute is 0.5mm to 3mm; 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 boss 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.