WO2022032875A1 - Air guide ring, centrifugal fan, and range hood - Google Patents

Abstract

An air guide ring, a centrifugal fan, and a range hood having same. The air guide ring (100) is used for the centrifugal fan (1000), the air guide ring (100) is configured to be installed at an air inlet (310) of the centrifugal fan (1000), and the air guide ring (100) comprises: an annular air guide portion (10), wherein at least part of the annular air guide portion (10) is arranged in a necking-down manner in the air inlet direction, the inner edge of the annular air guide portion (10) is configured to extend into a volute (300) of the centrifugal fan (1000), the inner edge of the annular air guide portion (10) comprises a shallowest extension point (N) and a deepest extension point (M), and the deepest extension point (M) protrudes out of the shallowest extension point (N) in the air inlet direction; and an installation portion (20) which is arranged at the outer edge of the annular air guide portion (10). According to the centrifugal fan, the air guide ring has good back pressure resistance, such that the backflow phenomenon is weakened; and the air guide ring has a large air inlet quantity, such that the air supply effect of the centrifugal fan is ensured.

Description

Air guides, centrifugal fans and range hoods

This application claims the priority of the Chinese patent application filed on August 10, 2020, the application number is 202010799470.4, and the title is "air guide ring, centrifugal fan and range hood", which is hereby incorporated by reference in its entirety.

technical field

The present application relates to the technical field of centrifugal fans, in particular to an air guide ring, a centrifugal fan and a range hood.

Background technique

In some application scenarios, the centrifugal fan needs to send the air into a specific environment with unstable wind pressure. In the public flue, but when the wind pressure in a specific environment is too high, that is, when the centrifugal fan is used in a high back pressure condition, return air/return will be generated.

In view of the above problems, in the related art, an air guide ring is arranged at the air inlet of the volute of the centrifugal fan. On the other hand, the gas at the air inlet can be guided to flow into the volute to achieve flow diversion.

However, after continued research, it was found that the wind guide ring usually adopts the design form of uniform longitudinal section, and the depth of its insertion into the air inlet of the centrifugal fan is uniform, which cannot adapt to different air supply environments.

SUMMARY OF THE INVENTION

The main purpose of this application is to propose an air guide ring, which aims to improve the adaptability of the centrifugal fan to different air supply environments.

In order to achieve the above purpose, the present application proposes an air guide ring for a centrifugal fan. The air guide ring is configured to be installed at the air inlet of the centrifugal fan, and the air guide ring includes:

an annular air guide part, the annular air guide part is arranged at least partially in the form of a constriction in the air inlet direction, the inner edge of the annular air guide part is configured to extend into the air inlet, and the inner edge of the annular air guide part is configured to extend into the air inlet. The edge includes a shallowest point of intrusion and a deepest point of intrusion, the deepest point of protrusion protruding from the shallowest point of protrusion in the air inlet direction; and

The installation part is arranged on the outer edge of the annular air guide part.

In one embodiment, the inner edge of the annular air guide portion further includes two extended connecting lines connecting the shallowest point and the deepest point, the extended connecting lines passing through the extending The projection of the shallowest point and the longitudinal section extending into the deepest point is an oblique line segment, a curved line segment, or a stepped line segment.

In one embodiment, the shallowest point of intrusion and the deepest point of intrusion are located on a longitudinal section passing through the centerline of the wind deflector.

In one embodiment, the two extending connecting lines are symmetrically arranged with respect to the longitudinal section passing through the shallowest point of intrusion, the deepest point of intrusion and the center line of the wind guide ring.

In one embodiment, an adjustable installation position is provided on the installation portion, and the adjustable installation position is configured to be connected with the volute of the centrifugal fan, so that when the air guide ring is installed on the centrifugal fan When the air inlet is installed, the installation angle of the air guide ring in the circumferential direction of the air inlet is adjustable.

In an embodiment, the adjustable installation position includes a plurality of first connection holes spaced along the circumferential direction of the annular air guide portion, and the plurality of first connection holes are configured to cooperate with the volute to form There are a plurality of matching connection positions distributed in sequence in the circumferential direction of the air inlet, and the air guide ring is configured to be installed on the volute through one of the matching connection positions, so that the air guide ring can be installed in the volute. The installation angle in the circumferential direction of the air inlet is adjustable; or,

The adjustable installation position includes an installation ring protrusion or an installation ring groove, and the air guide ring is configured to be rotatably installed on the volute through the installation ring protrusion or the installation ring groove, so that the air guide ring is rotatably installed on the volute. The installation angle of the ring in the circumferential direction of the air inlet is adjustable.

In one embodiment, the distance between the deepest point and the plane where the outer edge of the annular air guide part is located is greater than or equal to 2 mm and less than or equal to 20 mm.

In one embodiment, the distance between the deepest point of penetration and the shallowest point of penetration in the air inlet direction is greater than or equal to 5 mm and less than or equal to 25 mm.

In one embodiment, the annular air guide portion includes an annular guide portion that is constricted in the air inlet direction and an annular extension portion that is arranged on the inner edge of the annular guide portion, and the annular extension portion is in the air inlet direction. extending, the mounting part is arranged on the outer edge of the annular guide part; the inner edge of the annular extension part is used to form at least part of the inner edge of the annular air guide part.

In an embodiment, the longitudinal section of the annular guide portion is two arc segments, so that the annular guide portion is arranged in a constricted manner in the air inlet direction; or, the longitudinal section of the annular guide portion is two A diagonal line segment is formed, so that the annular guide portion is arranged in a constricted manner in the air inlet direction.

In one embodiment, the longitudinal section of the annular extension is two straight line segments.

In one embodiment, the mounting portion is a mounting ring disposed on the outer edge of the annular air guide portion; or,

The mounting portion is a plurality of mounting lugs arranged on the outer edge of the annular air guide portion and distributed at intervals along the circumferential direction of the annular air guide portion.

The application also proposes a centrifugal fan, comprising:

volute;

a centrifugal wind wheel, arranged in the volute; and

In the above air guide ring, the air guide ring is installed at the air inlet of the volute.

In one embodiment, when the centrifugal fan is in a high back pressure condition, the deepest point of the air guide ring is arranged close to the air outlet of the centrifugal fan;

When the centrifugal fan is in a low back pressure condition, the shallowest point of the air guide ring is configured to be close to the air outlet of the centrifugal fan.

In one embodiment, the longitudinal section that defines the deepest point and the center line of the wind guide ring is the first installation adjustment surface;

The longitudinal section that defines the center line of the air guide ring and is perpendicular to the first installation and adjustment surface is the second installation and adjustment surface;

The longitudinal section that defines the centerline of the wind wheel of the centrifugal fan and is perpendicular to the air supply direction of the centrifugal fan is the first installation reference surface;

When the centrifugal fan is in a high back pressure condition, the included angle between the second installation adjustment surface and the first installation reference surface is greater than or equal to 30 degrees and less than or equal to 120 degrees.

In one embodiment, the longitudinal section that defines the shallowest point of intrusion and the center line of the wind guide ring is the third installation adjustment surface;

The longitudinal section that defines the center line of the air guide ring and is perpendicular to the third installation and adjustment surface is the fourth installation and adjustment surface;

The longitudinal section that defines the centerline of the wind wheel of the centrifugal fan and is perpendicular to the air supply direction of the centrifugal fan is the first installation reference surface;

When the centrifugal fan is in a low back pressure condition, the included angle between the fourth installation adjustment surface and the first installation reference surface is greater than or equal to 30 degrees and less than or equal to 120 degrees.

In one embodiment, a section that defines the centerline of the air outlet of the centrifugal fan and is parallel to the centerline of the rotor of the centrifugal fan is the second installation reference surface;

When the centrifugal fan is in a high back pressure condition, the deepest point of penetration is located on the second installation reference surface; and/or, when the centrifugal fan is in a low back pressure condition, the deepest penetration point is The shallow point is located on the second mounting reference surface.

The present application also proposes a range hood, including the above centrifugal fan.

The wind guide ring of the present application, by forming the shallowest point and the deepest point on the inner edge of the annular air guide portion, the inner edge of the annular air guide portion can be divided in the circumferential direction of the annular air guide portion. In order to extend into the shallower section of the volute and the deeper section into the volute, the annular air guide section corresponding to the deeper section can have better backflow prevention. Therefore, the efficiency of the fan system can be improved, and the maximum standard static pressure of the fan system can be increased; the annular air guide part extending into the shallower section has a better air suction effect, thereby increasing the air intake.

In this way, the air guide ring can be made to have better anti-back pressure capability to reduce the backflow phenomenon, and the air guide ring can have a larger air intake to ensure the air supply effect of the centrifugal fan; furthermore, the centrifugal fan can be improved. Adaptability to different air supply environments.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without any creative effort.

1 is a schematic structural diagram of an embodiment of an air guide ring of the application;

Fig. 2 is the front view of the wind guide ring in Fig. 1;

Fig. 3 is a sectional view of the wind guide ring in Fig. 1;

FIG. 4 is a schematic structural diagram of another embodiment of the wind guide ring of the present application from a viewing angle;

5 is a schematic structural diagram of the wind guide ring in FIG. 4 from another perspective;

FIG. 6 is a schematic structural diagram from a perspective of some embodiments of the wind guide ring of the present application;

FIG. 7 is a schematic structural diagram of the wind guide ring in FIG. 6 from another perspective;

FIG. 8 is a schematic structural diagram from a viewing angle of other embodiments of the wind guide ring of the present application;

FIG. 9 is a schematic structural diagram of the wind guide ring in FIG. 8 from another perspective;

10 is a schematic structural diagram from a perspective of some other embodiments of the wind guide ring of the present application;

FIG. 11 is a schematic structural diagram of the wind guide ring in FIG. 10 from another perspective;

12 is a schematic structural diagram of yet another embodiment of an air guide ring of the present application;

Figure 13 is a front view of the wind guide ring in Figure 12;

Figure 14 is a cross-sectional view of the wind guide ring in Figure 12;

15 is a schematic structural diagram of an embodiment of a centrifugal fan of the present application;

16 is a schematic structural diagram of the application when the wind guide ring is installed; wherein, the deepest point of the extension is configured to be set close to the air outlet;

Fig. 17 is a schematic structural diagram of the air guide ring of the present application when it is installed; wherein, the shallowest point that extends into the air guide ring is configured to be set close to the air outlet.

Description of reference numbers:

label	name	label		name
100	wind guide	M	reach the deepest point
10	annular air guide	N	reach the shallowest point
11	ring guide	S	Second installation adjustment surface
111	first introductory segment	Q	Fourth installation adjustment surface
112	second lead	R	First Mounting Reference Surface
1121	guide protrusion	20	Installation Department
12	annular extension	1000	Centrifugal fan
10a	into the shallower section	200	Centrifugal impeller
10b	Reach deeper	300	volute
10c	first step	310	Inlet
10d	second step	320	air outlet
10e	third step

The realization, functional characteristics and advantages of the purpose of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.

It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of this application, the descriptions of "first", "second", etc. are only used for description purposes, and should not be construed as instructions or Implicit their relative importance or implicitly indicate the number of technical features indicated. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature.

In addition, the meaning of "and/or" in the whole text is to include three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, scheme B, or scheme that A and B satisfy at the same time.

The present application proposes an air guide ring and a centrifugal fan. The structure of the air guide ring will be described below in conjunction with the structure of the centrifugal fan.

In an embodiment of the present application, as shown in FIG. 15 , the centrifugal fan 1000 includes a volute 300 , a centrifugal fan wheel 200 and an air guide ring 100 . The centrifugal fan wheel 200 is arranged in the volute 300 , and the guide The wind ring 100 is installed on the air inlet 310 of the volute 300 . Specifically, the volute 300 has an air inlet 310 , an air outlet 320 and a centrifugal air duct disposed between the air inlet 310 and the air outlet 320 , and the centrifugal wind wheel 200 is arranged in the centrifugal air duct.

In an embodiment of the present application, as shown in FIGS. 1-14 , the air guide ring 100 includes an annular air guide portion 10 and a mounting portion 20 disposed on the outer edge of the annular air guide portion 10 . The mounting portion 20 is configured with In order to be installed on the volute 300, the air guide ring 100 is installed on the air inlet 310 of the volute 300; the annular air guide portion 10 is at least partially constricted in the air inlet direction, so as to be configured to guide the airflow into the volute inside the shell 300.

Specifically, the inner edge of the air guide ring 100 extends into the volute 300 through the air inlet 310 , and the mounting portion 20 is installed on the side wall of the volute 300 to fix the air guide ring 100 .

In a specific embodiment, the mounting portion 20 can be configured as an annular shape, that is, the mounting portion 20 is a mounting ring provided on the outer edge of the annular air guide portion 10; it can also be configured as a plurality of mounting convex portions, as described above. The mounting portion 20 is a plurality of mounting lugs protruding from the outer edge of the annular air guide portion 10 and distributed at intervals along the circumferential direction of the annular air guide portion 10; The air inlet 310 of the casing 300 is sufficient.

In this embodiment, the mounting portion 20 is a mounting ring, so as to facilitate the airtight mounting of the air guide ring 100 and the volute 300 . Specifically, the side surface of the mounting ring is attached to the outer surface of the side wall of the volute 300 .

Specifically, as shown in FIGS. 1-3 , the inner edge of the annular air guide portion 10 includes a shallowest point N and a deepest point M, and the deepest point M is convex in the air inlet direction Out of the shallowest point N of the penetration. Wherein, the shallowest point N that extends into the inner edge of the annular air guide portion 10 refers to the shallowest point that extends into the volute 300 on the inner edge of the annular air guide portion 10 , and the shallowest point N extends into the outer edge of the annular air guide portion 10 The plane distance is the smallest; the deepest point M that extends into the inner edge of the annular air guide portion 10 refers to the deepest point that extends into the volute 300, which extends into the deepest point M and the plane where the outer edge of the annular air guide portion 10 is located. maximum distance.

It can be understood that by forming the shallowest point N and the deepest point M on the inner edge of the annular air guide portion 10 , the inner edge of the annular air guide portion 10 can be formed on the circumference of the annular air guide portion 10 . It is divided into two sections upward, that is, the shallower section 10a that extends into the shallowest point N and the deeper section 10b that extends into the deepest section, the shallower section 10a that extends into the volute 300. The depth is relatively shallow, and the deep penetration section 10b protrudes into the volute 300 to a relatively deep depth. As shown in FIG. 1-3, the extended penetration section 10b protrudes beyond the extension into the shallower section 10a.

It can be understood that the more protruding/protruding the inner edge of the annular air guide portion 10 is in the air inlet direction, the wider the axial width of the annular air guide portion 10 (ie the width in the air inlet direction), the wider the annular air guide portion 10 is. The deeper the air portion 10 extends into the volute 300, the stronger the blocking effect of the annular air guide portion 10 on the backflow gas, but the blocking effect of the annular air guide portion 10 on the airflow entering the volute 300 through the air inlet 310 is also. The stronger it is, it is not conducive to increasing the air intake. Conversely, the narrower the axial width of the annular air guide portion 10 (that is, the width in the air inlet direction), the shallower the depth of the annular air guide portion 10 extending into the volute 300, the smaller the annular air guide portion 10 is to the return gas. The weaker the blocking effect is, the weaker the blocking effect of the annular air guide 10 on the airflow entering the volute 300 through the air inlet 310 is, which is beneficial to increase the air intake volume.

In the present application, by forming the shallowest point N and the deepest point M on the inner edge of the annular air guide portion 10 , the inner edge of the annular air guide portion 10 can be formed on the circumference of the annular air guide portion 10 . Upward is divided into a shallower section 10a and a deeper section 10b, and the deeper section 10b protrudes from the shallower section 10a in the air inlet direction, so that: the corresponding section 10b extends into the deeper The depth of the annular air guide portion 10 extending into the volute 300 is relatively deep. The blocking effect of the air guide portion 10 on the airflow entering the volute 300 through the air inlet 310 is also strong; The annular air guide portion 10 corresponding to 10a has a weak blocking effect on the backflow gas, but the annular air guide portion 10 corresponding to the shallower section 10a also has a weak blocking effect on the airflow entering the volute 300 through the air inlet 310 .

In the wind guide ring 100 of the present application, by forming the shallowest point N and the deepest point M on the inner edge of the annular wind guide part 10 , the inner edge of the annular wind guide part 10 can be formed on the inner edge of the annular wind guide part 10 The circumferential direction of the part 10 is divided into a shallower section 10a extending into the volute 300 and a deeper section 10b extending into the volute 300, so that the corresponding The annular air guide portion 10 has a good effect of preventing backflow, thereby improving the efficiency of the fan system and increasing the maximum standard static pressure of the fan system; the annular air guide portion 10 corresponding to the shallower section 10a has better suction wind effect, so as to increase the air intake. That is to say, in this way, the air guide ring 100 can be made to have better anti-back pressure capability to reduce the backflow phenomenon, and the air guide ring 100 can have a larger air intake to ensure the air supply effect of the centrifugal fan 1000. ; Further, the adaptability of the centrifugal fan 1000 to the air supply environment with unstable wind pressure can be improved.

In general, the wind guide ring 100 of the present application increases the axial gap between the wind guide ring 100 and the centrifugal wind wheel 200 , and effectively reduces the eddy current between the wind guide ring 100 and the centrifugal wind wheel 200 .

In the following, according to the air supply characteristics of the centrifugal fan 1000 , the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 will be illustrated as an example, so as to further describe the characteristics of the air guide ring 100 .

It can be understood that when the wind pressure in the air supply environment of the centrifugal fan 1000 (such as the public flue of a range hood, which is described below by taking the public flue as an example) is low (that is, the centrifugal fan 1000 is in a low back pressure condition) When no backflow occurs or the backflow phenomenon is weak, the airflow entering the volute 300 from the air inlet 310 flows to the air outlet 320, then the air flow at the edge of the air inlet 310 adjacent to the air outlet 320 is larger and the flow rate is higher. Fast, the air flow at the edge of the air inlet 310 away from the air outlet 320 is small and the flow rate is slow.

When the air pressure in the air supply environment of the centrifugal fan 1000 (such as the common flue of the range hood) is relatively high (that is, the centrifugal fan 1000 is in a high back pressure condition) and backflow occurs, the backflow air first enters through the air outlet 320 Inside the volute 300 , the backflow phenomenon at the edge of the air inlet 310 adjacent to the air outlet 320 is more common or serious, and the backflow phenomenon at the edge of the air inlet 310 away from the air outlet 320 is less common or milder.

That is to say, the air flow entering the volute 300 through the air inlet 310 is unevenly distributed in the circumferential direction of the air inlet 310 .

Therefore, when the wind pressure in the common flue is high (ie, high back pressure), when the wind guide ring 100 is installed on the volute 300, the inner edge of the annular wind guide portion 10 can be extended into the deeper section 10b Close to the air outlet 320 of the volute 300, the inner edge of the annular air guide 10 extends into the shallower section 10a away from the air outlet 320 of the volute 300; that is, the inner edge of the annular air guide 10 extends into the deeper section 10b is disposed corresponding to the edge of the air inlet 310 adjacent to the air outlet 320, so that the shallower section 10a of the inner edge of the annular air guide 10 is disposed corresponding to the edge of the air inlet 310 away from the air outlet 320.

In this way, on the one hand, by extending into the annular air guide portion 10 corresponding to the deeper section 10b, the backflow phenomenon at the air inlet 310 can be weakened (that is, extending into the deeper section 10b can block the backflow airflow, so that it needs to bypass longer The backflow phenomenon can be formed by the path of the centrifugal fan 1000 and the range hood, and the anti-back pressure capability and high static pressure capability of the centrifugal fan 1000 and the range hood are improved, and the maximum (standard) static pressure of the air supply system is increased. On the other hand, by extending into the annular air guide portion 10 corresponding to the shallower section 10a, the airflow blocked by the air guide ring 100 can be reduced, so as to increase the air intake volume.

When the wind pressure in the common flue is low (ie low back pressure), when the wind guide ring 100 is installed on the volute 300, the shallower section 10a of the inner edge of the annular wind guide part 10 can be inserted adjacent to the scroll The air outlet 320 of the casing 300 is arranged, and the deeper section 10b of the inner edge of the annular air guide 10 is arranged away from the air outlet 320 of the volute 300; The air inlet 310 is disposed adjacent to the edge of the air outlet 320 , so that the deeper extending section 10b of the inner edge of the annular air guide 10 is disposed corresponding to the edge of the air inlet 310 away from the air outlet 320 .

In this way, the blocking of the air guide ring 100 at the edge of the air inlet 310 adjacent to the air outlet 320 can be reduced, so as to further increase the air intake volume.

In this embodiment, when the wind guide ring 100 is installed on the volute 300 , the inner edge of the annular wind guide portion 10 can be at least partially in the axial direction of the centrifugal wind wheel 200 . The upper part is spaced from the end edge of the centrifugal wind wheel 200, and the inner edge of the annular air guide part 10 extends into the deeper section 10b at least partially into the centrifugal wind wheel 200, so that the annular guide section corresponding to the deeper section 10b extends. The wind portion 10 has a better effect of preventing backflow, and the annular wind guide portion 10 extending into the corresponding shallower section 10a has a better air suction effect. At the same time, the inner edge of the annular air guide portion 10 and the centrifugal wind wheel 200 have an appropriate radial gap, so as to prevent radial leakage and also prevent howling caused by too small radial gap.

Therefore, when the air guide ring 100 is applied to the centrifugal fan 1000, the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 can be adjusted, so as to adjust the air guide ring 100 according to the pressure change in the public flue. In order to improve the adaptability of centrifugal fan 1000 to the air supply environment with unstable wind pressure.

All in all, under different design requirements, the maximum static pressure value has different requirements, and the circumferential installation angle of the air guide ring 100 is adjusted according to different design requirements. For example, for "the proportion of the shallower section 10a extending into the inner edge of the annular air guide 10 is 1/2, and the proportion of the deeper section 10b extending into the inner edge of the annular air guide 10 is 1/2. In the 1/2" solution, the shallower section 10a and the deeper section 10b have two intersecting lines on the first bisector, and the value range of the angle between the first bisector and the horizontal plane is 0 ~ 360 degrees, which can be adjusted according to different design requirements.

In this embodiment, the air guide ring 100 is a circular ring.

Of course, in other embodiments, the air guide ring 100 can also be fixedly installed on the air inlet 310 , and the deeper extending section 10b of the inner edge of the annular air guide 10 is disposed close to the air outlet 320 of the volute 300 . In this way, under the condition of high back pressure, the backflow phenomenon at the air inlet 310 can be weakened, and the anti-back pressure capability of the centrifugal fan 1000 and the range hood can be improved; The setting can also significantly reduce the distribution of the low pressure area, which is beneficial to more suction airflow under low pressure conditions.

Further, an adjustable installation position is provided on the installation portion 20, and the adjustable installation position is configured to be connected with the volute 300 of the centrifugal fan 1000, so that when the air guide ring 100 is installed on the centrifugal fan 1000, When the air inlet 310 of the fan 1000 is installed, the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 10 is adjustable.

Specifically, the adjustable installation position is a general installation position. In this way, by setting the adjustable installation position on the installation portion 20 , the air guide ring 100 and the volute 300 can be formed around the air inlet 310 . There are a plurality of matching connection positions distributed in sequence upward, and the air guide ring 100 is alternatively installed on the volute 300 through one of the matching connection positions, so that the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 can be adjusted. tune.

In this embodiment, the adjustable installation position includes a plurality of first connection holes (specifically, the plurality of connection holes may be distributed on the installation ring at intervals along the circumference of the annular air guide portion, Alternatively, a plurality of connection holes may be distributed on the mounting lugs), and a plurality of the first connection holes are configured to cooperate with the mating positions on the volute to form a sequence distributed in the circumferential direction of the air inlet (310). Multiple mating connection bits.

Specifically, the fitting position includes a plurality of second connection holes on the side wall of the volute 300 and distributed along the circumferential direction of the air inlet 310 at intervals, so as to pass through the connection between the different first connection holes and the second connection holes. Combined, multiple mating connection positions can be formed. It can be understood that, the greater the number of matching connection positions, the more and more refined the adjustable angles of the air guide ring 100 .

In some embodiments, the plurality of first connection holes can be evenly distributed, and the number of the second connection holes is the same as that of the first connection holes. For example, there are 4 first connection holes, and they are No. 1 first Connecting holes, No. 2 first connecting holes, No. 3 first connecting holes, No. 4 first connecting holes; there are four second connecting holes, and they are No. 1 second connecting holes and No. 2 second connecting holes respectively. , No. 3 second connection hole, No. 4 second connection hole. Then, when the No. 1 first connection hole is connected with the No. 1 second connection hole, the No. 2 first connection hole is connected with the No. 2 second connection hole, the No. 3 first connection hole is connected with the No. 3 second connection hole, and the No. When the No. 4 first connection hole is connected with the No. 4 second connection hole, a mating connection position can be formed. When the No. 1 first connection hole is connected with the No. 2 second connection hole, the No. 2 first connection hole is connected with the No. 3 second connection hole, the No. 3 first connection hole is connected with the No. 4 second connection hole, and the No. 4 first connection hole is connected with the No. When a connection hole is connected with the No. 1 second connection hole, another mating connection position can be formed. etc.

In another partial embodiment, the number of the first connection holes may be greater than the number of the second connection holes, and the plurality of first connection holes are divided into multiple groups, and the number of the first connection holes in each group is connected with the second connection holes The number of holes is the same, and multiple sets of first connection holes are selectively connected with the second connection holes to form a plurality of matching connection positions, so that the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 can be adjusted. . For example, there are 6 first connecting holes, which are No. 1 first connecting hole, No. 2 first connecting hole, No. 3 first connecting hole, No. 4 first connecting hole, No. 5 first connecting hole, No. 6 first connection hole; there are three second connection holes, which are respectively No. 1 second connection hole, No. 2 second connection hole, and No. 3 second connection hole.

Then, when the No. 1 first connection hole is connected with the No. 1 second connection hole, while the No. 3 first connection hole is connected with the No. 2 second connection hole, and the No. 5 first connection hole is connected with the No. 3 second connection hole, A mating connection can be formed. When the No. 2 first connection hole is connected with the No. 1 second connection hole, while the No. 4 first connection hole is connected with the No. 2 second connection hole, and the No. 6 first connection hole is connected with the No. 3 second connection hole, it can be formed. Another mating connection bit.

Of course, in other embodiments, the adjustable installation position can also be a rotatable installation position, so that the air guide ring 100 can be rotatably installed on the volute 300, so that the air guide ring 100 can be rotatably installed in the volute. The installation angle of the tuyere 310 in the circumferential direction is adjustable. For example, the adjustable installation position may include an installation ring protrusion or an installation ring groove, and the air guide ring 100 is configured to be rotatably installed on the volute 300 through the installation ring protrusion or the installation ring groove, so that the air guide ring 100 is rotatably installed on the volute 300 The installation angle of the ring 100 in the circumferential direction of the air inlet 310 is adjustable. Specifically, in some embodiments, one of the mounting ring and the side wall of the volute 300 can be provided with a mounting ring protrusion, and the other is mounted with a mounting ring groove, and the mounting ring protrusion is slidable The air guide ring 100 is rotatably installed on the volute 300 .

Specifically, in order to facilitate the description of the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310, some auxiliary features need to be defined. Specifically, the longitudinal section that defines the deepest point M and the center line of the air guide ring 100 is the first installation adjustment surface, and defines the center line of the air guide ring 100 and is connected to the first installation adjustment surface. The vertical longitudinal section is the second installation adjustment surface S. The longitudinal section defined through the shallowest point N and the center line of the air guide ring 100 is the third installation adjustment surface; the longitudinal section defined through the center line of the air guide ring 100 and perpendicular to the third installation adjustment surface The cross section is the fourth installation adjustment surface Q. Wherein, when the protruding shallowest point N and the protruding deepest point M are located on the same longitudinal section passing through the center line of the air guide ring (100), the first installation adjustment surface and the third installation adjustment surface are the same The second installation adjustment surface S and the fourth installation adjustment surface Q are the same plane.

The longitudinal section that defines the centerline of the rotor of the centrifugal fan 1000 and is perpendicular to the air supply direction of the centrifugal fan 1000 is the first installation reference plane R; defines the centerline of the air outlet 320 of the centrifugal fan 1000, and A section parallel to the centerline of the rotor of the centrifugal fan 1000 is the second reference installation surface, wherein the first reference installation surface R is perpendicular to the second reference installation surface.

Further, when the centrifugal fan 1000 is in a high back pressure condition, the included angle between the second installation adjustment surface S and the first installation reference surface R is greater than or equal to 30 degrees and less than or equal to 120 degrees.

Specifically, when the centrifugal fan 1000 is in a high back pressure condition, the deepest point M is located on the second installation reference surface.

In this way, it can be achieved: under the condition of high back pressure, the backflow of the air outlet is blocked, that is, it extends into a deeper section to block the backflow air flow, and a longer path needs to be bypassed to form backflow, so as to achieve the maximum/larger air flow. Improve its ability to resist high static pressure and improve the ability to reverse blowing. At the same time, the shallowest point N can be kept far away from the air outlet, so that the position of the shallowest point N can be the most/more important air inlet position; among them, the shallowest point N can be the most/maximum and reduce the air inlet. Obstruction, the maximum / maximum increase the air intake.

Correspondingly, when the centrifugal fan 1000 is in a low back pressure condition, the angle between the fourth installation adjustment surface Q and the first installation reference surface R is greater than or equal to 30 degrees and less than or equal to 120 degrees, if possible. The shallowest point N of protruding is located on the second installation reference surface.

In this way, it can be achieved that the blocking of the air guide ring 100 at the edge of the air inlet 310 adjacent to the air outlet 320 can be reduced to the greatest extent, so as to further increase the air intake volume.

Of course, in the case where the wind pressure in the air supply environment does not change much, but the wind pressure is low (such as the exhaust air duct of a low-rise building), when the air guide ring 100 is applied to the centrifugal fan 1000, the guide ring 100 can also be used to make the guide The installation angle of the air ring 100 in the circumferential direction of the air inlet 310 is fixed, and the first section 10a of the inner edge of the annular air guide 10 is disposed adjacent to the air outlet 320 of the volute 300, and the second section of the inner edge of the annular air guide 10 10b is disposed away from the air outlet 320 of the volute 300 .

Of course, in the case where the wind pressure in the air supply environment does not change much, but the wind pressure is relatively high (such as the exhaust air duct of a high-rise building), when the wind guide ring 100 is applied to the centrifugal fan 1000, the The installation angle of the air ring 100 in the circumferential direction of the air inlet 310 is fixed, and the deeper section 10b of the inner edge of the annular air guide 10 is arranged adjacent to the air outlet 320 of the volute 300, and the inner edge of the annular air guide 10 extends. The shallow inlet section 10a is disposed away from the air outlet 320 of the volute 300 .

In this way, the adaptability of the centrifugal fan 1000 to different air supply environments can also be improved.

Therefore, the design of the air guide ring 100 of the present application can not only facilitate guiding the airflow into the volute 300, but also prevent the backflow phenomenon under high back pressure.

In this way, the air guide ring 100 of the present application does not significantly increase the cost of the complete range hood, and can achieve a better or optimal configuration in terms of the flow rate, standard static pressure and noise performance of the range hood.

In a specific embodiment, there are many structural forms in which the inner edge of the annular air guide portion 10 includes the shallowest point N and the deepest point M, which will be described with examples below.

As shown in FIGS. 1-3 , it can be understood that the inner edge of the annular air guide portion 10 gradually extends from the shallowest point N to the deepest point M along the circumferential direction in the air inlet direction. That is, the inner edge of the annular air guide portion 10 extends from the shallowest point N extending into the deepest point M along the circumferential direction from both sides of the shallowest point N. Therefore, the inner edge of the annular air guide portion 10 also includes two extending connecting lines extending into the shallowest point N and extending into the deepest point M.

In a specific embodiment, the change of the extending connection line in the direction of the air intake may be gradual or stepwise.

In this embodiment, as shown in Figures 1-3, the change of the extension connecting line in the air inlet direction is gradual, so as to better balance the anti-high static pressure capability of the air guide ring and increase the air intake volume The relationship between. Specifically, the projection of the extension connecting line in the longitudinal section overextending into the shallowest point N and extending into the deepest point M is an oblique line segment or a curved line segment.

Further, the extending into the shallowest point N and extending into the deepest point M are located on the longitudinal section passing through the center line of the wind guide ring 100, that is, the extending into the shallowest point N and extending into the deepest point M are located in the middle of the wind guide ring. 100 longitudinal sections.

Specifically, the two extending connecting lines are symmetrically arranged with respect to the longitudinal section passing through the shallowest point N, the deepest point M and the center line of the wind guide ring 100 . In this way, the ability to resist high static pressure can be more significantly improved and the air intake volume can be greatly improved.

Specifically, as shown in FIGS. 1-3 , the inner edge of the annular air guide portion 10 is located on the same oblique (cut) plane; or, the inner edge of the annular air guide portion 10 is located on the same arc (cut) face (convex or concave). In this way, the manufacturing difficulty of the wind guide ring 100 can also be reduced.

In this embodiment, as shown in FIGS. 2 and 3 , the inner edges of the annular air guide portion 10 are located on the same oblique (cut) plane.

It can be understood that when extending to a certain position/point in the extending direction of the shallowest point N of extending into the deepest point M, that is, extending from the protruding shallower section 10a to forming the deeper protruding section 10b, this position The change point is the boundary between the shallower section 10a and the deeper section 10b. In this way, it is convenient to divide the inner edge of the annular air guide portion 10 into a shallower section 10a and a deeper section 10b.

Further, the protruding shallower section 10a accounts for more than or equal to 1/4 of the inner edge of the annular air guide 10, and is less than or equal to 3/4; correspondingly, the protruding deeper section 10b accounts for The proportion of the inner edge of the annular air guide portion 10 is less than or equal to 3/4, and greater than or equal to 1/4. In this way, the ratio of extending into the shallower section 10a and extending into the deeper section 10b can be designed according to different structures of the centrifugal fan 1000 .

As in this embodiment, the protruding shallower section 10 a accounts for 1/2 of the inner edge of the annular air guide 10 , and the deeper protruding section 10 b accounts for 1/2 of the inner edge of the annular air guide 10 . The proportion is 1/2, that is, the shallow extending section 10a occupies half of the inner edge of the annular air guide 10 , and the deeper extending section 10b occupies the other half of the inner edge of the annular air guide 10 . In this way, the structure of the air guide ring 100 is simplified, and the air guide ring 100 can have better performance.

Of course, the proportion of the shallower extending section 10a to the inner edge of the annular air guide 10 can also be 2/5, and the deeper extending section 10b can also account for the proportion of the inner edge of the annular air guide 10 Alternatively, the protruding shallower section 10a may account for 3/5 of the inner edge of the annular air guide 10, and the deeper protruding section 10b may occupy the inner edge of the annular air guide 10 The proportion of the edge is 2/5; alternatively, the proportion of the shallower section 10a extending into the inner edge of the annular air guide 10 can be 1/3, and the deeper section 10b extending into the annular air guide can be made to account for 1/3. The proportion of the inner edge of the annular air guide portion 10 is 2/3; alternatively, the proportion of the inner edge of the annular air guide portion 10 may be 2/3 of the shallower section 10a, the deeper section 10b may be The proportion of the inner edge of the annular air guide portion 10 is 1/3; alternatively, the portion 10a extending into the shallower portion of the inner edge of the annular air guide portion 10 can be made to account for 0.45, and the portion extending deeper The ratio of the segment 10b to the inner edge of the annular air guide portion 10 is 0.55; alternatively, the portion 10a extending into the shallower portion of the inner edge of the annular air guide portion 10 can be 0.55, and the protruding deeper portion can be made to account for 0.55. The proportion of the segment 10b to the inner edge of the annular air guide 10 is 0.45; and so on.

Further, as shown in FIGS. 1-3 , the annular air guide portion 10 includes an annular guide portion 11 that is constricted in the air inlet direction and an annular extension portion 12 that is disposed on the inner edge of the annular guide portion 11 . The annular extension portion 12 extends in the air inlet direction, and the inner edge of the annular extension portion 12 is used to form at least part of the inner edge of the annular air guide portion 10 , and the mounting portion 20 is provided outside the annular guide portion 11 . edge.

Specifically, the axial width of the annular extending portion 12 varies in the circumferential direction, so as to be configured to form the shallowest point N and the deepest point M, etc. on the inner edge of the annular air guide portion 10 . Moreover, since the inner edge of the annular extension portion 12 is used to form at least part of the inner edge of the annular air guide portion 10 , the axial width of the annular extension portion 12 is gradual in the circumferential direction.

In this way, the suction wind resistance of the wind guide ring 100 can be reduced. Among them, the axial width of the annular extension portion 12 has a great influence on the maximum static pressure.

Further, as shown in FIG. 3 , the longitudinal section of the annular guide portion 11 is two arc segments, so that the annular guide portion 11 is provided with a constriction in the air inlet direction; or, the annular guide portion The longitudinal section of 11 is two oblique line segments, so that the annular guide portion 11 is arranged in a constricted manner in the air inlet direction.

In this embodiment, the longitudinal section of the annular guide portion 11 is two arc line segments.

Further, as shown in FIG. 3 , the longitudinal section of the annular extension portion 12 is two straight line segments.

Optionally, the two straight line segments are parallel to the center line of the wind guide ring 100 .

It should be noted that, if the annular extension portion 12 is a half ring with a notch/opening, the longitudinal section of the annular extension portion 12 may also be a straight segment.

It should be explained that 1) the air guide ring 100 is usually a thin plate structure. When describing the longitudinal cross-sectional shapes of the annular guide portion 11 and the annular extension portion 12, for ease of understanding, the thickness of the air guide ring 100 is ignored. 2) The longitudinal cross-sections of the annular guide portion 11 and the annular extension portion 12 are cross-sections passing through the center line of the wind guide ring 100 .

Further, the deepest point M is formed at the widest axial width of the annular extension 12, and the axial width of the annular extension 12 at the widest axial width is greater than or equal to 2 mm and less than or equal to 24mm.

It can be understood that, as shown in FIG. 3 , the wider the axial width at the widest axial width of the annular extension portion 12 is, the easier it is to make the deepest point M protruding/protruding in the air inlet direction, then The larger the effective blocking area extending into the deeper section 10b, the better the backflow prevention effect, but the greater the wind resistance.

Therefore, in order to take into account the backflow prevention effect and the air intake volume, the axial width D at the widest axial width of the annular extension portion 12 can be greater than or equal to 2 mm, and less than or equal to 24 mm, optionally greater than or equal to 2 mm, and less than or equal to 20 mm; such as 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, etc.

Further, as shown in FIG. 3 , the distance H between the shallowest point N and the deepest point M in the air inlet direction is greater than or equal to 4 mm and less than or equal to 30 mm.

It can be understood that if the distance H between the shallowest point N and the deepest point M in the air inlet direction is too small, the effect of the wind guide ring 100 will be poor; If the axial width of the annular air guide portion 10 corresponding to the shallower section 10a is too small, or the axial width of the annular air guide portion 10 corresponding to the shallower section 10a is too large, the air intake will be too small. Therefore, the distance between the shallowest point N and the deepest point M in the air inlet direction can be greater than or equal to 4 mm and less than or equal to 30 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm. mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26mm, 27mm, 28mm, 29mm, etc.

It should be noted here that the annular extension portion 12 can be either a complete ring structure/closed ring structure or a half ring structure with a gap/opening. When the annular extension portion 12 is a half-ring structure, the inner end of the annular guide portion 11 can be chamfered to form the shallowest point N; therefore, in practical applications, the shallowest point N and the deepest point M are The distance in the air inlet direction may also be greater than the axial width at the widest axial width of the annular extension 12 .

It should be specially mentioned here that the annular air guide portion 10 may not be subdivided, that is, the longitudinal section of the annular air guide portion 10 is two arc segments or two oblique line segments, so that the annular air guide portion 10 is in the air inlet direction. Narrow setting on top.

In another embodiment of the present application, as shown in FIGS. 4-11 , the change of the extending connecting line in the air inlet direction is a step change, so that the inner edge of the annular air guide portion 10 is stepped. distributed.

Specifically, the inner edge of the annular air guide portion 10 includes a first step 10c and a second step 10d that are oppositely arranged, the shallowest point N is set on the first step 10c, and the deepest point M is provided on the second step 10d.

Specifically, the first step 10c is the shallowest step extending into the volute 300, that is, the first step 10c is the step closest to the plane where the outer edge of the annular air guide 10 is located; the second step The step 10d is the deepest step extending into the volute 300, that is, the second step 10d is the step with the farthest distance from the plane where the outer edge of the annular air guide 10 is located, so that the deeper section 10b extends into the air inlet. The direction protrudes into the shallower section 10a.

It can be understood that the protruding shallower section 10a includes a first step 10c, and the deeper protruding section 10b includes a second step 10d.

In this embodiment, by distributing the inner edge of the annular air guide portion 10 in a stepped shape, the air guide ring 100 can have a better anti-back pressure and anti-return air intake area, so as to increase the maximum standard of the fan system Static pressure, and has a large flow air intake area to ensure the air supply effect of the fan system; thus, the adaptability of the centrifugal fan 1000 to different air supply environments can be improved.

Moreover, by distributing the inner edge of the annular air guide portion 10 in a stepped shape, the effective axial gap between the inner edge of the air guide ring 100 and the centrifugal wind wheel 200 can be increased, so that the air guide ring 100 and the centrifugal wind can be effectively reduced. At the same time, the stepped air guide ring 100 can play a role of turbulence, so as to reduce the turbulent flow phenomenon at the outlet end of the air guide ring 100, and play a role in reducing noise.

In this application, the air guide ring 100 can ensure that the volute 300 does not leak air under the condition of high back pressure, and can improve the static pressure; the air guide ring 100 can also ensure that the main air inlet area ( The flow extending into the area corresponding to the shallower section 10a) can increase the air volume.

In this embodiment, the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 is also adjustable.

In this embodiment, further, when the wind pressure in the common flue is high (ie, high back pressure), the second step 10d is arranged close to the air outlet 320 of the volute 300, and the first step 10c is far away from the scroll The air outlet 320 of the casing 300 is provided. In this way, on the one hand, the backflow phenomenon at the air inlet 310 can be weakened (that is, the deep section 10b with the second step 10d can block the backflow airflow, so that it needs to bypass a longer path to form the backflow phenomenon), and the The anti-back pressure capability of centrifugal fan 1000 and range hood and its anti-high static pressure capability increase the maximum (standard) static pressure of the air supply system. On the other hand, through the annular air guide portion 10 with the first step 10c extending into the shallower section 10a corresponding to the air guide ring 100, the airflow can be reduced and the air intake volume can be increased.

In this embodiment, further, when the wind pressure in the common flue is relatively high (ie, when the back pressure is high), the midpoint of the second step 10d can be located at the second installation reference surface.

In this embodiment, when the wind pressure in the common flue is low (that is, when the back pressure is low), the first step 10c can be arranged close to the air outlet 320 of the volute 300, and the second step 10d is far away from the volute 300 The air outlet 320 is set. In this way, the blocking of the air guide ring 100 at the edge of the air inlet 310 adjacent to the air outlet 320 can be reduced, so as to further increase the air intake volume.

In this embodiment, further, when the wind pressure in the common flue is low (that is, when the back pressure is low), the midpoint of the first step 10c can be located at the second installation reference surface.

Of course, in this embodiment, the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 can also be made non-adjustable, and the second step 10d is arranged close to the air outlet 320; The midpoint of the two steps 10d is located on the second installation reference surface.

Understandably, it can be assumed that the midpoint of the second step 10d is the deepest point M, and the midpoint of the first step 10c is the shallowest point N.

In this embodiment, specifically, the number of steps formed by the inner edge of the annular air guide portion 10 is greater than or equal to 2, and less than or equal to 12, such as 3 steps, 4 steps, 5 steps, 6 steps, 7th, 8th, 9th, 10th, or 11th, etc.

It can be understood that the number of steps of the wind guide ring 100 can be adjusted according to the performance requirements of the fan system. The greater the number of steps, the smaller the average axial gap between the wind guide ring 100 and the centrifugal rotor 200, the greater the maximum standard static pressure of the fan system, the lower the air volume of the fan system, and the greater the noise level. The smaller the number of steps, the larger the average axial gap between the air guide ring 100 and the centrifugal wind wheel 200, the smaller the maximum standard static pressure of the fan system, the higher the air volume of the fan system, and the gap between the impeller and the wind guide ring 100. The eddy current is better and the noise level is improved.

In this embodiment, the order of the steps formed by the inner edge of the annular air guide portion 10 is greater than 2. Specifically, the inner edge of the annular air guide portion 10 further includes at least one third step 10e disposed between the first step 10c and the second step 10d, as shown in FIGS. 4 and 5 . In an embodiment, there may be one third step 10e, or, as shown in FIGS. 6 and 7, in some embodiments of the wind guide ring 100 of the present application, there may be two third steps 10e, or, as shown in FIGS. 9, in some other embodiments of the wind guide ring 100 of the present application, there may be three third steps 10e, or, as shown in FIGS. 10 and 11, in some other embodiments of the wind guide ring 100 of the present application, There may be four third steps 10e, etc. In this way, the anti-turbulence effect can be enhanced.

In this embodiment, optionally, the proportion of the first step 10 c to the inner edge of the annular air guide portion 10 is greater than or equal to 1/4, and the second step 10 d accounts for the inner edge of the annular air guide portion 10 . The proportion is greater than or equal to 1/4.

In this embodiment, the annular air guide portion 10 includes an annular guide portion 11 that is constricted in the air inlet direction, and an annular extension portion 12 that is disposed on the inner edge of the annular guide portion 11. The installation portion 20 is provided at The outer edge of the annular guide portion 11 ; the inner edge of the annular extension portion 12 is used to form at least part of the inner edge of the annular air guide portion 10 .

In this embodiment, further, the annular extension portion 12 has a notch, the first step 10 c is formed at the notch of the annular extension portion 12 , and the second step 10 d is formed in the annular extension portion 12 . In this way, the intake air volume extending into the shallower section 10a can be easily increased.

In this embodiment, further, as shown in FIGS. 4-7 , the inner edge of the annular extending portion 12 forms a second step 10d; at this time, the inner edge of the annular guiding portion 11 in the notch may form a second step 10d. For a step 10c, the inner edge of the annular guide portion 11 in the notch can also be distributed in a stepped shape to form a first step 10c and a third step 10e between the first step 10c and the second step 10d.

Of course, in other embodiments, as shown in FIGS. 8-11 , the inner edge of the annular extension portion 12 can also be distributed in a stepped shape to form the second step 10d and the second step 10c and the second step. The third step 10e between 10d; at this time, either the inner edge of the annular guide portion 11 in the gap can form the first step 10c, or the inner edge of the annular guide portion 11 in the gap can be distributed in a stepped shape, so as to form a first step 10c. A first step 10c and a third step 10e provided between the first step 10c and the second step 10d are formed.

In this embodiment, optionally, there is a second bisector, and the second bisector is a longitudinal section passing through the midpoint of the first step 10c and the midpoint of the second step 10d, and the inner portion of the annular extension 12 The edges are arranged symmetrically about this second bisector.

Of course, in other embodiments, the annular extension portion 12 can also be a closed ring structure, and the inner edge of the annular extension portion 12 is distributed in a stepped shape, so that the inner edge of the annular air guide portion 10 is arranged in a stepped shape. Step-like distribution (the inner edge of the annular extension portion 12 is the inner edge of the annular air guide portion 10 ); the first step 10c is formed at the narrowest axial width of the annular extension portion 12 , and the second step 10d is formed at the widest axial width of the annular extension 12 .

In this embodiment, further, the longitudinal section of the annular guide portion 11 is two arc segments, so that the annular guide portion 11 is provided with a constriction in the air inlet direction; alternatively, the annular guide portion The longitudinal section of 11 is two oblique line segments, so that the annular guide portion 11 is arranged in a constricted manner in the air inlet direction.

In this embodiment, specifically, the longitudinal section of the annular guide portion 11 is two arc line segments.

In this embodiment, further, the longitudinal section of the annular extension portion 12 is two straight line segments. Optionally, the two straight line segments are parallel to the center line of the wind guide ring 100 .

It should be noted that, if the annular extension portion 12 is a half-ring structure with a notch, the longitudinal section of the annular extension portion 12 may also be a straight line segment.

The present application also continues to improve the structure of the annular guide portion 11, so that the air guiding ring 100 has different air guiding performances in the circumferential direction of the air inlet 310. The specific structure is described below.

In yet another embodiment of the present application, as shown in FIGS. 12-14 , the air guide ring 100 includes an annular air guide portion 10 and a mounting portion 20 .

In this embodiment, as shown in FIGS. 12-14 , the annular air guide portion 10 includes an annular guide portion 11 , and the annular guide portion 11 is provided with a constriction in the air inlet direction, and the annular guide portion 11 The longitudinal section is two arc segments.

The annular guide portion 11 includes a first guide segment 111 and a second guide segment 112 distributed in the circumferential direction of the annular guide portion 11 , and the second guide segment 112 includes protrusions in the opposite direction of the air inlet direction. on the guide protrusion 1121 of the first guide section 111 . Specifically, the annular guide portion 11 is divided into two segments in the circumferential direction of the annular guide portion 11 , namely, a first guide segment 111 and a second guide segment 112 .

Wherein, the structure of the mounting portion 20 can be referred to the above embodiments, and it is not necessary to describe it in detail here.

It can be understood that the air guide ring 100 in this embodiment of the present application is divided into a first guide segment 111 and a second guide segment 112 by dividing the annular guide portion 11 of the air guide ring 100 into a first guide segment 111 and a second guide segment 112 in the circumferential direction, and the second guide segment 112 Including a guide protrusion 1121 protruding from the first guide section 111 in the opposite direction of the air inlet direction, the guide protrusion 1121 can further guide the airflow near the air inlet 310 to enter the volute 300 It is smoother, thereby increasing the air inlet speed and reducing noise; at the same time, the air guiding performance of the air guiding ring 100 in the circumferential direction of the air inlet 310 can be different, thereby improving the adaptability of the centrifugal fan 1000 to different air supply environments .

When the air guide ring 100 is applied to the centrifugal fan 1000 and the range hood, the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 will be described in detail below.

It can be seen from the above analysis that when the wind pressure in the public flue is low (ie, low back pressure), the air flow at the edge of the air inlet 310 adjacent to the air outlet 320 is larger and the flow velocity is faster, and the air inlet 310 is far away from the air outlet 320. The air flow at the edge of the air outlet 320 is relatively small and the flow velocity is relatively slow. At this time, when the air guide ring 100 is installed on the volute 300 , the second guide section 112 can be disposed close to/near the air outlet 320 of the volute 300 , and the first guide section 111 can be disposed away from the air outlet 320 of the volute 300 That is, the second guide segment 112 is arranged corresponding to the edge of the air inlet 310 adjacent to the air outlet 320, and the first guide segment 111 is arranged corresponding to the edge of the air inlet 310 away from the air outlet 320. In this way, the air flow can be further guided to flow into the volute 300 from the edge of the air inlet 310 adjacent to the air outlet 320, so as to further increase the air intake volume.

When the wind pressure in the common flue is high (ie, high back pressure), the backflow phenomenon at the edge of the air inlet 310 away from the air outlet 320 is rare or mild. At this time, when the air guide ring 100 is installed on the volute 300 , the first guide section 111 can be disposed close to/near the air outlet 320 of the volute 300 , and the second guide section 112 can be disposed away from the air outlet 320 of the volute 300 That is, the first guide segment 111 is arranged corresponding to the edge of the air inlet 310 adjacent to the air outlet 320 , and the second guide segment 112 is arranged corresponding to the edge of the air inlet 310 away from the air outlet 320 . In this way, the air flow can be further guided to flow into the volute 300 from the edge of the air inlet 310 away from the air outlet 320, so as to further increase the air intake volume.

Therefore, in this embodiment, when the air guide ring 100 is applied to the centrifugal fan 1000, the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 can be adjusted to adjust according to the pressure change in the common flue. to adjust the installation angle of the air guide ring 100 to improve the adaptability of the centrifugal fan 1000 to the air supply environment with unstable wind pressure.

For the structural form that makes the installation angle of the air guide ring 100 in the circumferential direction of the air inlet 310 adjustable, reference may be made to the above embodiments, which need not be described in detail here.

In this embodiment, when the centrifugal fan 1000 is in a high back pressure condition, the middle of the first guide section 111 is close to the second installation reference surface (the second installation reference surface). and/or, when the centrifugal fan 1000 is in a low back pressure condition, the second guide section 112 is disposed close to the second installation reference surface.

In this embodiment, as shown in FIGS. 12-14 , the inner edge of the annular guide portion 11 is located in the first plane. The manufacturing difficulty of the wind guide ring 100 can be reduced.

In this embodiment, as shown in FIGS. 12-14 , further, the outer edge of the annular guide portion 11 is located on the second plane.

In this way, by placing the outer edge of the annular guide portion 11 on the second plane, the mounting portion 20 can be easily disposed, so as to facilitate the sealing connection between the mounting portion 20 and the volute 300 .

In this embodiment, as shown in FIGS. 12-14 , the longitudinal section of the annular guide portion 11 is two arc line segments. In this way, the wind guide performance can be improved.

In this embodiment, as shown in FIGS. 12-14 , the radius of the longitudinal section of the second guide segment 112 gradually increases in the direction away from the first guide segment 111 in the circumferential direction.

Specifically, the first guide segment 111 and the second guide segment 112 have two connection points, and at any connection point, the radius of the longitudinal section of the second guide segment 112 is away from the first guide segment 111 in the circumferential direction gradually increases in the direction of the second guide segment, and increases to a maximum at the middle/midpoint in the circumferential direction of the second guide segment.

In this way, the uniformity of the air guide can be improved to prevent sudden changes in the airflow.

In this embodiment, the radius of the longitudinal section of the first guide section 111 is unchanged, and the radius of the longitudinal section of the first guide section 111 is greater than or equal to 8 mm, and less than or equal to 32 mm, such as preferably 9 mm, 10 mm, 12 mm, 14 mm, 16 mm, 17 mm, 18 mm, 20 mm, 21 mm, 22 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, or 29 mm, etc.

In this embodiment, the radius of the longitudinal section of the second guide section 112 is larger than the radius of the longitudinal section of the first guide section 111 . And the radius of the longitudinal section of the second guide section 112 is greater than or equal to 10 mm and less than or equal to 55 mm, such as 11 mm, 12 mm, 14 mm, 16 mm, 17 mm, 18 mm, 20 mm, 21 mm mm, 22 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 34 mm, 36 mm, 38 mm, mm, 40 mm, 42 mm, 44 mm, 45 mm mm, 47 mm, 49 mm, 50 mm, 52 mm, 53 mm, 54 mm, or 55 mm, etc.

The selection of the radius of the longitudinal section of the first guide section 111 and the radius of the longitudinal section of the second guide section 112 can be selected according to design requirements, such as air intake volume requirements, and the specifications of the centrifugal fan 1000 and the range hood, etc. .

In this embodiment, further, as shown in FIGS. 12-14 , the annular air guide portion 10 further includes an annular extension portion 12 disposed on the inner edge of the annular guide portion 11 , and the inner edge of the annular extension portion 12 It is used to form at least part of the inner edge of the annular air guide portion 10 .

In this embodiment, specifically, the axial width of the annular extending portion 12 is set to vary (ie, change) in the circumferential direction of the annular air guiding portion 10 , so that the annular air guiding portion 10 The inner edge includes a shallowest point N configured to protrude into the volute and a deepest point M configured to protrude into the volute, the shallowest point N10a corresponding to the second guide section 112 The middle of the first guide section 111 is arranged in the middle, and the deepest point M10b that extends in corresponds to the middle of the first guide section 111 .

Specifically, the inner edge of the annular air guide portion 10 is divided into two sections in the circumferential direction of the annular air guide portion 10 , namely, the shallower section 10a including the shallowest point N and the shallowest section 10a including the deepest The protruding deeper segment 10b, the protruding shallower segment 10a protruding into the volute 300 has a shallower depth, and the protruding deeper segment 10b protruding into the volute 300 has a deeper depth, and the protruding depth into the volute 300 is relatively deep. The deeper entry section 10b protrudes from the shallower entry section 10a in the air inlet direction. The shallow protruding section 10 a is provided corresponding to the second guide section 112 , and the deep protruding section 10 b is provided corresponding to the first guide section 111 .

For the structures, functions and formation methods of the shallower section 10a and the deeper section 10b, refer to the above embodiments, for example, the inner edge of the annular air guide portion 10 also includes the connection and the shallowest point N and two extending connecting lines extending into the deepest point M, the change of the extending connecting lines in the direction of the air intake can be either gradual or stepwise, etc.; and so on. It is unnecessary to elaborate here.

However, it should be particularly pointed out that the guiding protrusions 1121 of the second guiding section 112 can enhance the drainage and drainage effects, and the arrangement extending into the shallower section 10a can also enhance the drainage and drainage effects, and the corresponding arrangement of the two can greatly enhance the drainage and drainage effects. The drainage and drainage effect of the air guide ring 100 can greatly increase the air intake volume.

That is to say, the air guide ring 100 can ensure that the volute 300 does not leak air under the condition of high back pressure, which can increase the static pressure, improve the back pressure resistance of the range hood, and at the same time prevent more airflow backflow/return phenomenon; the air guide ring 100 can also ensure that under the condition of low back pressure and large flow, the flow of the main air inlet area (extending into the area corresponding to the shallower section 10a) is not hindered, and the air inlet volume can be increased. Moreover, the air flow can be further guided by the guiding protrusions 1121 of the second guiding section 112, so that the air flow is smoother and the noise is lower.

In this embodiment, the larger the proportion of the second guide section 112 in the circumferential direction of the annular guide portion 11, the more obvious the enhancement effect on the flow guidance and flow guidance effect of the wind guide ring 100 is.

In this embodiment, further, the proportion of the first guide segment 111 or the second guide segment 112 in the circumferential direction of the annular guide portion 11 is the same as the proportion extending into the deeper segment 10b or into the shallower segment 10a The proportion of the inner edge of the annular air guide portion 10 corresponds to that. For example, optionally, the first guide segment 111 or the second guide segment 112 equally divides the annular guide portion 11 in the circumferential direction of the annular guide portion 11 .

The application also proposes a range hood, which includes a centrifugal fan. The specific structure of the centrifugal fan refers to the above-mentioned embodiments. All the beneficial effects brought by the technical solutions of the embodiments will not be repeated here.

Specifically, the range hood includes a smoke collecting chamber and a fan system, and the fan system includes a centrifugal fan.

The above descriptions are only optional embodiments of the present application, and are not intended to limit the patent scope of the present application. Under the inventive concept of the present application, any equivalent structural transformations made by using the contents of the description and drawings of the present application, or direct/indirect Applications in other related technical fields are included in the scope of patent protection of this application.

Claims (19)

1. An air guide ring is used for a centrifugal fan, wherein the air guide ring is configured to be installed at an air inlet of the centrifugal fan, and the air guide ring includes:

   an annular air guide part, the annular air guide part is at least partially constricted in the air inlet direction, the inner edge of the annular air guide part is configured to extend into the volute of the centrifugal fan, the annular air guide part is The inner edge of the portion includes a shallowest point of intrusion and a deepest point of intrusion, the deepest point of protrusion protruding from the shallowest point of protrusion in the air inlet direction; and

   The installation part is arranged on the outer edge of the annular air guide part.
2. The air guide ring according to claim 1, wherein the inner edge of the annular air guide part further comprises two extending connecting lines connecting the shallowest point and the deepest point, the extending connection The projection of the line in the longitudinal section passing through the shallowest point and the deepest point is an oblique line segment, a curved line segment, or a stepped line segment.
3. The wind guide ring according to claim 2, wherein the shallowest point of intrusion and the deepest point of protrusion are located on a longitudinal section passing through the center line of the wind guide ring.
4. The wind guide ring according to claim 3, wherein the two extending connecting lines are symmetrically arranged with respect to the longitudinal section passing through the shallowest point, the deepest point and the center line of the wind guide ring .
5. The air guide ring according to claim 1, wherein an adjustable installation position is provided on the installation part, and the adjustable installation position is configured to be connected with the volute of the centrifugal fan, so that when the air guide is used When the ring is installed at the air inlet of the centrifugal fan, the installation angle of the air guide ring in the circumferential direction of the air inlet can be adjusted.
6. The air guide ring according to claim 5, wherein the adjustable installation position comprises a plurality of first connection holes distributed at intervals along the circumferential direction of the annular air guide portion, and the plurality of first connection holes are configured as In cooperation with the matching positions on the volute, a plurality of matching connecting positions distributed in sequence in the circumferential direction of the air inlet are formed, and the air guide ring is configured to be alternatively installed on the scroll through one of the matching connecting positions. shell, so that the installation angle of the air guide ring in the circumferential direction of the air inlet can be adjusted; or,

   The adjustable installation position includes an installation ring protrusion or an installation ring groove, and the air guide ring is configured to be rotatably installed on the volute through the installation ring protrusion or the installation ring groove, so that the air guide ring is rotatably installed on the volute. The installation angle of the ring in the circumferential direction of the air inlet is adjustable.
7. The air guide ring according to any one of claims 1 to 6, wherein the annular air guide portion comprises an annular guide portion arranged in a constricted manner in the air inlet direction and an annular guide portion arranged on an inner edge of the annular guide portion an extension part, the annular extension part extends in the air inlet direction, the mounting part is provided on the outer edge of the annular guide part; the inner edge of the annular extension part is used to form at least part of the annular air guide part inner edge.
8. The air guide ring according to claim 7, wherein the longitudinal section of the annular guide portion is two arc segments, so that the annular guide portion is arranged in a constricted manner in the air inlet direction; or, the annular guide portion is The longitudinal section of the guide portion is two oblique line segments, so that the annular guide portion is provided with a constriction in the air inlet direction.
9. The wind guide ring according to claim 7, wherein the longitudinal section of the annular extension portion is two straight line segments.
10. The wind guide ring according to claim 7, wherein the deepest point is formed at the widest axial width of the annular extension portion, and the axial width of the annular extension portion at the widest axial width is greater than or equal to 2 mm and less than or equal to 20 mm.
11. The wind guide ring according to claim 10, wherein the distance between the deepest point of penetration and the shallowest point of penetration in the wind inlet direction is greater than or equal to 5 mm and less than or equal to 25 mm.
12. The air guide ring according to any one of claims 1 to 6, wherein the mounting portion is a mounting ring provided on the outer edge of the annular air guide portion; or,

    The mounting portion is a plurality of mounting lugs arranged on the outer edge of the annular air guide portion and distributed at intervals along the circumferential direction of the annular air guide portion.
13. A centrifugal fan, comprising:

    volute;

    a centrifugal wind wheel, arranged in the volute; and

    The air guide ring according to any one of claims 1 to 12, wherein the air guide ring is installed at the air inlet of the volute.
14. The centrifugal fan according to claim 13, wherein when the centrifugal fan is in a high back pressure condition, the deepest point of the air guide ring is arranged close to the air outlet of the centrifugal fan;

    When the centrifugal fan is in a low back pressure condition, the shallowest point of the air guide ring is configured to be close to the air outlet of the centrifugal fan.
15. The centrifugal fan according to claim 14, wherein, the longitudinal section that defines the deepest point and the center line of the wind guide ring is the first installation adjustment surface;

    The longitudinal section that defines the center line of the air guide ring and is perpendicular to the first installation and adjustment surface is the second installation and adjustment surface;

    The longitudinal section that defines the centerline of the wind wheel of the centrifugal fan and is perpendicular to the air supply direction of the centrifugal fan is the first installation reference surface;

    When the centrifugal fan is in a high back pressure condition, the included angle between the second installation adjustment surface and the first installation reference surface is greater than or equal to 30 degrees and less than or equal to 120 degrees.
16. The centrifugal fan according to claim 14, wherein, the longitudinal section that defines the centerline of the shallowest point and the wind guide ring is the third installation adjustment surface;

    The longitudinal section that defines the center line of the air guide ring and is perpendicular to the third installation and adjustment surface is the fourth installation and adjustment surface;

    The longitudinal section that defines the centerline of the wind wheel of the centrifugal fan and is perpendicular to the air supply direction of the centrifugal fan is the first installation reference surface;

    When the centrifugal fan is in a low back pressure condition, the included angle between the fourth installation adjustment surface and the first installation reference surface is greater than or equal to 30 degrees and less than or equal to 120 degrees.
17. The centrifugal fan according to claim 14, wherein a section that defines the centerline of the air outlet of the centrifugal fan and is parallel to the centerline of the rotor of the centrifugal fan is the second installation reference surface;

    When the centrifugal fan is in a high back pressure condition, the deepest point of penetration is located on the second installation reference surface; and/or, when the centrifugal fan is in a low back pressure condition, the deepest penetration point is The shallow point is located on the second mounting reference surface.
18. The centrifugal fan according to claim 13, wherein the deepest point of the air guide ring is arranged close to the air outlet of the centrifugal fan.
19. A range hood comprising the centrifugal fan according to any one of claims 13 to 18.

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