Range hood

Abstract

The present invention relates to the field of oil fume extraction equipment. Specifically, it relates to a deflector and a range hood. The deflector is used to be installed on the outer side of the smoke collecting hood. A convex portion is provided on the side of the deflector opposite to the smoke collecting hood. The convex portion is disposed opposite to the air inlet on the smoke collecting hood, and there is a gap between the two. Oil fume can flow into the air inlet on the smoke collecting hood along the surface of the convex portion. The range hood includes the above-mentioned deflector. The deflector and the range hood provided by the present invention are not prone to form a "swirling area" in the area between the deflector and the smoke collecting hood, the oil fume is not prone to escape, and the oil fume extraction effect is relatively good.

Description

Technical Field

[0001] The present invention relates to the field of oil fume extraction equipment, and more particularly, to an oil fume extractor. Background Art

[0002] Some oil fume extractors are equipped with a deflector outside the air inlet of the smoke collecting hood to use the deflector to block the air inlet and guide the oil fume to the air inlet.

[0003] However, when the existing oil fume extractor is in use, after the oil fume enters the area between the deflector and the smoke collecting hood, it is easy to break away from the deflector, causing air flow disorder and forming a "swirling area", resulting in oil fume escape and poor oil fume extraction effect.

[0004] In summary, how to overcome the above defects of the deflector of the existing oil fume extractor is a technical problem that those skilled in the art need to solve urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a deflector and an oil fume extractor to alleviate the technical problem that a "swirling area" is easily formed in the area between the deflector and the smoke collecting hood of the existing oil fume extractor.

[0006] The deflector provided by the present invention is used to be installed outside the smoke collecting hood. A convex portion is provided on the side of the deflector opposite to the smoke collecting hood; the convex portion is disposed opposite to the air inlet on the smoke collecting hood, and there is a gap between the two, and the oil fume can flow into the air inlet on the smoke collecting hood along the surface of the convex portion.

[0007] Preferably, as an implementable manner, the convex portion is a spherical surface.

[0008] Preferably, as an implementable manner, the center position of the convex portion is disposed opposite to the center position of the air inlet on the smoke collecting hood.

[0009] Preferably, as an implementable manner, the distance between the edge of the deflector and the smoke collecting hood ranges from 30 to 40 mm, and the chord height of the spherical surface ranges from 5 to 10 mm.

[0010] Correspondingly, the present invention also provides an oil fume extractor including the above deflector.

[0011] Preferably, as an implementable manner, the oil fume extractor further includes an oil receiving cup and a diversion seat.

[0012] The condensate formed by the cooking fumes on the deflector plate can flow along the deflector plate to the deflector seat, and the condensate flowing onto the deflector seat and the condensate formed by the cooking fumes on the deflector seat can both flow along the deflector seat to the oil collecting cup; and / or, the deflector seat is provided with a groove with an opening facing the deflector plate, and the lower end of the deflector plate is located in the groove.

[0013] Preferably, as an implementable embodiment, the bottom surface of the deflector seat is an arc surface that extends upward respectively toward the left and right sides of the range hood.

[0014] Preferably, as an implementable embodiment, at the part of the smoke collecting hood close to the air inlet, there are a plurality of concave areas arranged circumferentially along the air inlet; the surface of the concave area is inclined gradually in a direction away from the center position of the air inlet from the outside to the inside relative to the air inlet.

[0015] Preferably, as an implementable embodiment, the arrangement density of the concave areas gradually increases from the top end to the bottom end of the air inlet on the smoke collecting hood.

[0016] Preferably, as an implementable embodiment, a retaining ring is provided at the air inlet of the fan system of the range hood, and the retaining ring has an arc-shaped convex part and a conical cylinder part. The arc-shaped convex part is an annular structure with an arc-shaped cross section, and the shape of the barrel wall of the conical cylinder part is the same as the shape of the side wall of a frustum of a cone.

[0017] The conical cylinder part extends into the impeller of the fan system. The cross section of the conical cylinder part gradually decreases from the outside to the inside. The flared end of the conical cylinder part is smoothly connected to the inner circular edge of the arc-shaped convex part, and there is a gap between the constricted end of the conical cylinder part and the inner circle of the impeller.

[0018] The beneficial effects of the deflector plate and the range hood provided by the present invention are:

[0019] The deflector plate can block the cooking fumes. Under the action of the negative pressure and the wall attachment effect at the air inlet of the smoke collecting hood, the blocked cooking fumes can flow along the plate surface of the deflector plate away from the smoke collecting hood toward the edge of the deflector plate and bypass the deflector plate to enter the area between the deflector plate and the smoke collecting hood; the cooking fumes entering the area between the deflector plate and the smoke collecting hood will flow toward the inside of the air inlet of the smoke collecting hood under the action of the negative pressure at the air inlet of the smoke collecting hood.

[0020] It should be noted that the raised portion provided on the side of the deflector opposite to the smoke collecting hood conforms more closely to the flow direction of the cooking fumes flowing inside the air inlet towards the smoke collecting hood. Under the negative pressure of the air inlet of the smoke collecting hood, the cooking fumes will flow along the surface of the raised portion towards the part of the raised portion closest to the air inlet of the smoke collecting hood. On this basis, the raised portion is arranged opposite to the air inlet on the smoke collecting hood. In this way, the cooking fumes in the area between the deflector and the smoke collecting hood can smoothly enter the air inlet of the smoke collecting hood along the surface of the raised portion. Thus, the wall attachment effect of the raised portion on the cooking fumes is utilized more fully, the flow direction of the cooking fumes is better sorted out, and under the influence of the wall attachment effect generated by the raised portion on the cooking fumes, the flow rate will decrease. Therefore, when the cooking fumes enter the air inlet of the smoke collecting hood, there is a sequence, and it is not easy to cause air flow disorder, and the probability of generating a "swirling area" is relatively low.

[0021] Therefore, the area between the deflector and the smoke collecting hood provided by the present invention is not easy to form a "swirling area".

[0022] The range hood provided by the present invention includes the above-mentioned deflector.

[0023] Therefore, for the range hood provided by the present invention, the area between the deflector and the smoke collecting hood is not easy to form a "swirling area", the cooking fumes are not easy to escape, and the smoke extraction effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic cross-sectional structure view of the range hood provided by the embodiment of the present invention;

[0026] Figure 2 It is a schematic three-dimensional structure view of the deflector provided by the embodiment of the present invention;

[0027] Figure 3 It is a front view of a partial structure of the smoke collecting hood in the range hood provided by the embodiment of the present invention;

[0028] Figure 4 It is a schematic cross-sectional view of a partial structure of the smoke collecting hood in the range hood provided by the embodiment of the present invention;

[0029] Figure 5 It is a schematic three-dimensional structure view of the deflector seat in the range hood provided by the embodiment of the present invention;

[0030] Figure 6Schematic cross-sectional structure diagram of the retaining ring in the range hood provided by the embodiment of the present invention.

[0031] Icon:

[0032] 100 - Deflector; 110 - Protruding part;

[0033] 200 - Smoke collecting hood; 210 - Concave area;

[0034] 300 - Oil receiving cup;

[0035] 400 - Deflection seat;

[0036] 500 - Fan system; 510 - Retaining ring; 511 - Arc-shaped protruding part; 512 - Conical cylinder part; 520 - Impeller. Detailed implementation manners

[0037] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] Next, the present invention will be further described in detail through specific embodiments in conjunction with the accompanying drawings.

[0041] See Figure 1 and Figure 2The present embodiment provides a guide plate 100 for installation on the outside of a smoke hood 200. A protrusion 110 is provided on the side of the guide plate 100 opposite to the smoke hood 200. The protrusion 110 is arranged opposite to the air inlet on the smoke hood 200, and there is a gap between the two. The oil smoke can flow into the air inlet on the smoke hood 200 along the surface of the protrusion 110.

[0042] On the basis of the above structure, the guide plate 100 can block the oil smoke. Under the action of the negative pressure at the air inlet of the smoke hood 200 and the wall attachment effect, the blocked oil smoke can flow along the guide plate 100 away from the plate surface of the smoke hood 200 toward the edge of the guide plate 100, and bypass the guide plate 100 to enter the area between the guide plate 100 and the smoke hood 200; the oil smoke entering the area between the guide plate 100 and the smoke hood 200 will flow toward the inside of the air inlet of the smoke hood 200 under the action of the negative pressure at the air inlet of the smoke hood 200.

[0043] It should be noted that the raised portion 110 arranged on the side opposite to the guide plate 100 and the smoke hood 200 is more in line with the flow direction of the oil smoke flowing toward the inside of the air inlet of the smoke hood 200. Under the negative pressure of the air inlet of the smoke hood 200, the oil smoke will flow along the surface of the raised portion 110 toward the part of the raised portion 110 closest to the air inlet of the smoke hood 200. On this basis, the raised portion 110 is arranged opposite to the air inlet on the smoke hood 200. In this way, the oil smoke flowing toward the inside of the air inlet of the smoke hood 200 is more in line with the flow direction of the oil smoke flowing toward the inside of the air inlet of the smoke hood 200. The oil smoke in the area between the smoke hoods 200 can smoothly enter the air inlet of the smoke hood 200 along the surface of the protrusion 110, thereby more fully utilizing the wall attachment effect of the protrusion 110 on the oil smoke, so that the flow direction of the oil smoke is better combed, and the oil smoke is affected by the wall attachment effect of the protrusion 110. The flow velocity of the oil smoke will be reduced. Therefore, when the oil smoke enters the air inlet of the smoke hood 200, there is a sequence, air flow turbulence is less likely to occur, and the probability of generating a "swirl zone" is low.

[0044] Therefore, the area between the guide plate 100 and the smoke collecting hood 200 provided in this embodiment is not likely to form a “rotation zone”.

[0045] The raised portion 110 can be set to a spherical surface, so that the direction of the airflow on the raised portion 110 changes smoothly, and the oil smoke can flow more smoothly along the raised portion 110 to the part of the raised portion 110 closest to the air inlet of the smoke hood 200, thereby reducing the amount of oil smoke that instantly leaves the raised portion 110 and improving the combing effect of the oil smoke.

[0046] Preferably, the central position of the convex portion 110 is disposed opposite to the central position of the air inlet on the smoke collecting hood 200. Thus, while the oil fume flows along the convex portion 110 towards the portion of the convex portion 110 closest to the air inlet of the smoke collecting hood 200, it also flows towards the central position of the air inlet on the smoke collecting hood 200. Therefore, the convex portion 110 has a better effect of combing the oil fume.

[0047] Specifically, the distance range between the edge of the deflector 100 and the smoke collecting hood 200 is set to 30 - 40 mm, and the chord height range of the spherical surface is set to 5 - 10 mm. Thus, the convex portion 110 has a better effect of guiding the oil fume.

[0048] An annular flat portion may also be provided on the side of the deflector 100 opposite to the smoke collecting hood 200, and the outer edge of the flat portion is made to coincide with the edge of the deflector 100, and the inner edge of the flat portion intersects with the outer edge of the convex portion 110. Thus, the deflector 100 is not easily interfered with by other structures (such as hooks for connecting the deflector 100 and the smoke collecting hood 200) located between the deflector 100 and the smoke collecting hood 200.

[0049] See Figure 1 , this embodiment also provides a range hood, which includes the above-mentioned deflector 100.

[0050] Therefore, in the range hood provided by this embodiment, it is not easy to form a "swirling area" in the area between the deflector 100 and the smoke collecting hood 200, the oil fume is not easily escaped, and the oil fume suction effect is better.

[0051] See Figure 1 and Figure 5 , in the specific structure of the range hood, an oil drip cup 300 and a diversion seat 400 are provided.

[0052] The condensate formed by the oil fume on the deflector 100 can flow along the deflector 100 to the diversion seat 400, and is diverted by the diversion seat 400 into the oil drip cup 300. Moreover, the oil fume condensed on the diversion seat 400 can also be diverted by the diversion seat 400 into the oil drip cup 300. Thus, the amount of condensate dripping onto the stove top below the range hood can be reduced. Furthermore, the cleanliness of the stove top can be maintained, and the labor cost for cleaning the stove top can be saved.

[0053] A groove with an opening facing the deflector 100 is provided on the diversion seat 400, and the lower end of the deflector 100 is extended into the inside of the groove. Thus, the oil fume rising to the diversion seat 400 will be blocked by the diversion seat 400, and under the action of the wall attachment effect, it can flow along the lower surface of the diversion seat 400 towards the periphery, and then enter the gap between the deflector 100 and the smoke collecting hood 200.

[0054] It should be noted that during the upward movement of the cooking fumes, they will accumulate in the lower region of the deflector 100. In this embodiment, a deflector seat 400 is added at the lower end of the deflector 100, which can use the deflector seat 400 to block the accumulated cooking fumes and divert the cooking fumes, so that the accumulated cooking fumes can be dispersed, alleviating the problem that a large amount of cooking fumes directly pour into the gap between the deflector 100 and the smoke collecting hood 200 from the lower end of the deflector 100. Thus, the problem of cooking fume escape caused by a relatively large local cooking fume density can be alleviated, and the cooking fume suction effect can be improved.

[0055] Specifically, the bottom surface of the deflector seat 400 can be set as an arc surface that extends upward respectively toward the left and right sides of the range hood (the left and right sides of the user relative to the orientation after the range hood is installed), so that the diversion effect of the deflector seat 400 on the cooking fumes can be improved.

[0056] See Figure 1 - Figure 4 , at the part of the smoke collecting hood 200 close to the air inlet, a number of recessed areas 210 arranged circumferentially along the air inlet can be provided; the surface of the recessed area 210 is set to be inclined gradually in a direction away from the center position of the air inlet from the outside to the inside relative to the air inlet. The setting of the recessed area 210 can increase the air inlet area of the air inlet of the smoke collecting hood 200 and can conduct the cooking fumes, which can not only alleviate the problem of the "whirlpool area" generated by the accumulation of cooking fumes, but also make better use of the wall attachment effect, so that the flow rate of the cooking fumes is further reduced and the cooking fume escape is reduced.

[0057] Preferably, the arrangement density of the recessed areas 210 can be set to gradually increase from the top end to the bottom end of the air inlet on the smoke collecting hood 200, that is, the density of the recessed areas 210 in the main air inlet area where the cooking fumes are likely to accumulate is relatively large. Thus, the cooking fumes in the main air inlet area can be better conducted, and the cooking fume escape situation can be better alleviated.

[0058] See Figure 1 and Figure 6 , at the air inlet of the fan system 500 of the range hood, a retaining ring 510 is provided. The retaining ring 510 has an arc-shaped convex portion 511 and a conical cylinder portion 512. Among them, the arc-shaped convex portion 511 is an annular structure with an arc-shaped cross section, and the shape of the wall of the conical cylinder portion 512 is the same as the shape of the side wall of a frustum of a cone; the conical cylinder portion 512 is extended into the impeller 520 of the fan system 500, and the cross section of the conical cylinder portion 512 gradually decreases from the outside to the inside, and the flared end (i.e., the outer end) of the conical cylinder portion 512 is smoothly connected to the inner circular edge of the arc-shaped convex portion 511.

[0059] When the range hood is working, after the cooking fumes pass through the air inlet on the smoke collecting hood 200, the fumes at the edge will first flow through the arc-shaped protrusion of the retaining ring 510, and then enter the conical cylinder part 512. The air flow entering the conical cylinder part 512 gradually gathers under the guidance of the conical cylinder part 512, and finally enters the inside of the impeller 520 and is discharged by the fan system 500. Among them, the arc-shaped protrusion part 511 can guide the air flow, so that the air flow outside the arc-shaped protrusion part 511 can smoothly enter the conical cylinder part 512 along the smooth curved surface. The air flow continues to flow along the smooth curved surface towards the inside of the impeller 520 in the conical cylinder part 512, which can alleviate the problem of the reduction of the oil fume suction efficiency of the fan system 500 caused by the generation of eddy currents at the folding angle, and improve the oil fume suction effect.

[0060] The reduced end of the conical cylinder part 512 is set to have a gap with the inner circle of the impeller 520. In this way, there is no triangular area between the conical cylinder part 512 and the inner circle of the impeller 520, which can reduce the possibility of generating eddy currents, and thus improve the oil fume suction efficiency of the fan system 500 and reduce the noise generated due to the eddy current problem.

[0061] Specifically, the axis of the conical cylinder part 512 coincides with the axis of the impeller 520 in the fan system 500. In this way, the conveying effect of the fan system 500 on the cooking fumes can be improved.

[0062] Specifically, the gap between the reduced end of the conical cylinder part 512 and the inner circle of the impeller 520 is set to 5 mm. With this gap value, not only can the possibility of generating eddy currents be well reduced, the oil fume suction efficiency of the fan system 500 be improved, but also the reduced end of the conical cylinder part 512 can maintain a relatively large air inlet area.

[0063] Specifically, the range of the angle β between the side wall of the conical cylinder part 512 and the end plane of the air inlet of the fan system 500 can be set to 110° - 125°; the contraction angle α of the arc-shaped protrusion part 511 (that is, the angle between the outer edge of the arc-shaped protrusion part 511 and the end plane of the air inlet of the fan system 500) can be set between 40° - 60°.

[0064] An arc-shaped flanging that turns outward can be provided at the reduced end of the conical cylinder part 512, which can further alleviate the problem of the eddy current area generated at the reduced end of the conical cylinder part 512 and improve the oil fume suction effect.

[0065] Specifically, the radius corresponding to the circular cross-section of the above-mentioned arc-shaped flanging can be selected as any value between 8 mm and 12 mm.

[0066] The range hood provided in the present embodiment is provided with a guide seat 400 below the guide plate 100. The guide seat 400 has a groove with an opening facing the guide plate 100, so that the lower end of the guide plate 100 can penetrate into the groove of the guide seat 400. The oil smoke rising to the guide seat 400 will be blocked by the guide seat 400 and flow toward the peripheral side along the lower surface of the guide seat 400, and then enter the gap between the guide plate 100 and the smoke collecting hood 200. In this way, the guide seat 400 forms a first barrier for the range hood. A spherical protrusion 110 is provided on the side of the guide plate 100 opposite to the smoke hood 200, and the center position of the protrusion 110 is opposite to the center position of the air inlet on the smoke hood 200. The oil smoke entering the gap between the guide plate 100 and the smoke hood 200 can flow along the protrusion 110 to the air inlet of the smoke hood 200. In this way, the protrusion 110 forms a second drainage for the range hood; the edge of the air inlet of the smoke hood 200 is provided with a plurality of concave areas 21 arranged along the circumferential direction. 0, the surface of the recessed area 210 is gradually inclined from the outside to the inside relative to the air inlet in a direction away from the center of the air inlet, so that the oil smoke passing through the air inlet can flow along the surface of the recessed area 210 to the inside of the air inlet, so that the recessed area 210 forms a third level of drainage for the range hood; the retaining ring 510 at the air inlet of the fan system 500 has an arc-shaped protrusion 511 and a conical cylinder 512 from the outside to the inside, wherein the conical cylinder 512 extends into the impeller 520 of the fan system 500 , and the cross-section of the conical cylinder 512 gradually decreases from the outside to the inside. After the oil smoke enters from the air inlet of the smoke hood 200, it will enter the impeller 520 through the air inlet surrounded by the retaining ring 510. In this way, the retaining ring 510 forms a fourth drainage for the range hood. In summary, the range hood provided in this embodiment can form a four-fold drainage for the oil smoke. Therefore, under the condition that the air inlet area is limited by factors such as appearance, the wind speed at the air inlet of the range hood can be increased as much as possible, thereby reducing the escape of oil smoke and improving the oil smoke extraction effect.

[0067] In summary, the present invention discloses a guide plate and a range hood, which overcomes many technical defects of the guide plate of the conventional range hood. The guide plate and the range hood provided in this embodiment are not easy to form a "roundabout area" in the area between the guide plate 100 and the fume hood 200, so that the oil fume is not easy to escape, and the oil fume extraction effect is better.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil fume extractor, characterized in that, it includes: a smoke collecting hood and a deflector installed outside the smoke collecting hood (200); a convex portion (110) is provided on one side of the deflector (100) opposite to the smoke collecting hood (200); the convex portion (110) is disposed opposite to the air inlet on the smoke collecting hood (200), and there is a gap between the two, and oil fume can flow into the air inlet on the smoke collecting hood (200) along the surface of the convex portion (110); at a position of the smoke collecting hood (200) close to the air inlet, there are a plurality of recessed areas (210) arranged circumferentially along the air inlet; the surface of the recessed area (210) is inclined gradually from outside to inside relative to the air inlet in a direction away from the center position of the air inlet.

2. The oil fume extractor according to claim 1, characterized in that, the surface of the convex portion (110) is a spherical surface.

3. The oil fume extractor according to claim 2, characterized in that, the central position of the convex portion (110) is disposed opposite to the central position of the air inlet on the smoke collecting hood (200).

4. The oil fume extractor according to claim 2 or 3, characterized in that, the distance between the edge of the deflector (100) and the smoke collecting hood (200) ranges from 30 to 40 mm, and the chord height of the spherical surface ranges from 5 to 10 mm.

5. The oil fume extractor according to claim 1, characterized in that, the oil fume extractor further includes an oil receiving cup (300) and a deflector seat (400); the condensate formed by the oil fume on the deflector (100) can flow along the deflector (100) to the deflector seat (400), and the condensate flowing onto the deflector seat (400) and the condensate formed by the oil fume on the deflector seat (400) can both flow along the deflector seat (400) into the oil receiving cup (300); and / or, the deflector seat (400) is provided with a groove with an opening facing the deflector (100), and the lower end of the deflector (100) is located in the groove.

6. The oil fume extractor according to claim 5, characterized in that, the bottom surface of the deflector seat (400) is an arc surface extending upward respectively toward the left and right sides of the oil fume extractor.

7. The oil fume extractor according to claim 1, characterized in that, the arrangement density of the recessed areas (210) gradually increases from the top end to the bottom end of the air inlet on the smoke collecting hood (200).

8. The oil fume extractor according to any one of claims 5 - 7, characterized in that, a retaining ring (510) is provided at the air inlet of the fan system (500) of the oil fume extractor, and the retaining ring (510) has an arc-shaped convex portion (511) and a conical cylinder portion (512), the arc-shaped convex portion (511) is an annular structure with an arc-shaped cross-section, and the shape of the barrel wall of the conical cylinder portion (512) is the same as the shape of the side wall of a frustum of a cone; The conical cylinder part (512) extends into the impeller (520) of the fan system (500). The cross-section of the conical cylinder part (512) gradually decreases from outside to inside. The flared end of the conical cylinder part (512) is smoothly connected to the inner circular edge of the arc-shaped convex part (511), and there is a gap between the narrowed end of the conical cylinder part (512) and the inner circle of the impeller (520).

Images