Flow collector mounting structure of centrifugal fan, centrifugal fan and range hood

Abstract

The utility model relates to a current collector mounting structure of a centrifugal fan, the centrifugal fan and a range hood. The current collector mounting structure comprises a volute, a flow guide plate and a flow guide plate, the flow collector is connected to the air inlet of the front side plate and comprises an annular flow guide part and a connecting ring; the connecting ring is further provided with a locking knob, the locking knob comprises a knob body rotatably arranged on the connecting ring and a limiting rib arranged on the knob body, and the front side plate is provided with a front-back through limiting hole for the limiting rib to penetrate through. The locking knob at least has a locking state in which the limiting rib is limited at the rear side of the peripheral edge of the limiting hole so as to limit the limiting rib to be forwards separated from the limiting hole along with the change of the rotating position of the locking knob relative to the connecting ring, and an unlocking state in which the limiting rib moves to a position opposite to the limiting hole so as to allow the limiting rib to be forwards separated from the limiting hole. The current collector has the advantages that the current collector is more convenient to disassemble and assemble and is firmer after being installed.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field especially, relates to a kind of flow collector mounting structure of centrifugal fan, centrifugal fan and range hood. BACKGROUND

[0002] Range hood is a kind of kitchen appliance for purifying kitchen environment, for the oil fume generated in the cooking process is rapidly drawn away, improve kitchen environment. Among them, volute is an important component of range hood, it generally includes front cover plate, rear cover plate and the ring wall between front cover plate and rear cover plate, and front cover plate air inlet is equipped with flow collector. The front cover plate of traditional volute and flow collector are generally assembled together by screw connection mode, and disassembly is very inconvenient.

[0003] There is also a mounting structure that flow collector is connected on volute by buckle mode, such as the Chinese patent application for invention with application No. CN201010576162.1 (authorized announcement No. CN102478269B) discloses a volute and range hood provided with the volute, wherein, air inlet ring is provided with at least one clamping protrusion on its surface towards the air inlet; front baffle is provided with the same number of clamping notches as the number of clamping protrusions at its air inlet, the clamping notches correspond to the clamping protrusions one by one, and the clamping notches are for corresponding clamping protrusions to pass through; the inner surface of front baffle is provided with the same number of clamping channels as the number of clamping protrusions at the air inlet, and the clamping channels correspond to the clamping notches one by one, and the clamping channels are connected with corresponding clamping notches; the clamping protrusion can pass through the corresponding clamping notch, and then rotate the air inlet ring around the center of the air inlet, and the clamping protrusion can enter the corresponding clamping channel, so that the air inlet ring is clamped on the front baffle. In the above patent application, volute and air inlet ring are connected by rotating clamping mode, and in order to avoid the air inlet ring from being reversed out after installation, corresponding anti-reverse protrusion needs to be arranged in clamping channel, and such structure arrangement makes the disassembly process of air inlet ring still have certain difficulty, especially, the arrangement of anti-reverse protrusion makes users need to use special tools to make clamping protrusion reverse out, which is time-consuming and laborious, and assembly efficiency is not high.

[0004] There are also installation structures for connecting the current collector to the volute by snap connection, such as the Chinese utility model patent application No. CN202121628486.5 (authorized publication No. CN215861006U) discloses a connection structure of an inlet ring and a volute for a centrifugal fan, which comprises: a volute having an inlet; an inlet ring connected at the inlet of the volute, comprising a ring-shaped flow guide portion and a ring wall extending radially outward from the flow guide portion; the ring wall and the volute are detachably connected together through a snap assembly, and the snap assembly comprises a snap on the inner side of the ring wall and a socket on the volute for inserting the snap. The snap connection is convenient to disassemble and assemble, but also has certain disadvantages. The snap connection may loosen due to uneven stress or fatigue during long-term operation or under a large wind pressure, thereby affecting the sealing and stability between the inlet ring and the volute. On the other hand, the snap connection may cause vibration and noise during the operation of the fan, which not only affects the operation efficiency of the fan, but also may cause damage to other parts of the fan.

[0005] Therefore, the current collector mounting structure of the centrifugal fan needs to be further improved. Utility model content

[0006] The first technical problem to be solved by the utility model is to provide a centrifugal fan current collector mounting structure which is convenient to disassemble and assemble and can effectively improve the problem of unstable current collector mounting.

[0007] The second technical problem to be solved by the utility model is to provide a centrifugal fan applying the above-mentioned current collector mounting structure.

[0008] The third technical problem to be solved by the utility model is to provide an extractor hood applying the above-mentioned centrifugal fan.

[0009] The technical scheme adopted by the utility model to solve the first technical problem is: a centrifugal fan current collector mounting structure, comprising:

[0010] A volute comprising a front side plate, a rear side plate and a ring wall connected between the front side plate and the rear side plate, the front side plate being provided with an inlet;

[0011] A current collector connected at the inlet of the front side plate, comprising a ring-shaped flow guide portion and a connecting ring extending radially outward from the flow guide portion;

[0012] The connecting ring is further provided with a locking knob, the locking knob comprises a knob main body rotatably arranged on the connecting ring and a limiting rib arranged on the knob main body, the front side plate is provided with a limiting hole penetrating front and back and allowing the limiting rib to pass through, and the locking knob has at least a locking state of limiting the limiting rib on the rear side of the peripheral edge of the limiting hole to limit the limiting rib from escaping forward from the limiting hole and an unlocking state of allowing the limiting rib to escape forward from the limiting hole by moving to a position opposite to the limiting hole with the change of the rotating position of the locking knob relative to the connecting ring.

[0013] The collector is connected with the front side plate of the volute by the locking knob, when the collector needs to be installed on the front side plate of the volute, only the limiting rib of the locking knob needs to be rotated by a certain angle after passing through the limiting hole on the front side plate of the volute, and the limiting rib is limited on the rear side of the peripheral edge of the limiting hole and cannot escape forward from the limiting hole, thereby being in the locking state. When the collector needs to be disassembled, the locking knob is rotated to the position opposite to the limiting hole, so that the limiting rib can escape forward from the limiting hole to realize unlocking. The locking and unlocking by the locking knob are more convenient for the operator to operate, the disassembly process is more labor-saving, and the loosening or loosening problem caused by the movement and vibration of the fan is less likely to occur, thereby ensuring the reliability of the connection between the collector and the front side plate of the volute.

[0014] In order to simplify the structure of the locking knob, the knob main body comprises a limiting disc, a knob operating part protruding from the front side of the limiting disc, and a protruding column extending rearward from the rear side of the limiting disc, and the limiting rib protrudes radially outward from the peripheral wall of the protruding column.

[0015] In order to facilitate the limiting rib to pass rearward through the limiting hole of the front side plate of the volute, the limiting rib extends along the axial direction of the protruding column, and the size of the limiting rib protruding outward relative to the protruding column gradually increases from rear to front.

[0016] In order to avoid the loss of the locking knob, the locking knob can be rotationally limited on the connecting ring of the collector, that is, the locking knob and the collector form a combined assembly without disassembly. In order to realize the rotational connection of the locking knob and the connecting ring, the connecting ring is provided with an axial hole for rotationally limiting the protruding column therein, and the peripheral wall of the protruding column is provided with an annular limiting groove for clamping the peripheral edge of the axial hole therein. It is conceivable that the locking knob can also be a separate component that can be conveniently disassembled from the connecting ring of the collector. In this way, the connecting ring of the collector can be correspondingly provided with a hole groove structure opposite to the limiting hole, and when the collector is installed, the hole groove of the connecting ring of the collector can be first centered with the limiting hole on the front side plate of the volute, and then the limiting rib of the locking knob can be rotated by a certain angle to pass through the hole groove of the connecting ring and the limiting hole on the front side plate of the volute to realize locking.

[0017] In order to avoid the problem of shaking after the current collector is installed in place, further guarantee the firmness of the current collector installation, and further improve the installation efficiency of the current collector, the limiting disc has a part of the outer periphery edge exposed outside the connecting ring, and the limiting disc has a limiting convex shaft extending rearward on the part of the outer periphery edge exposed outside the connecting ring.

[0018] In order to effectively prompt the locking knob to be in the unlocked state, further improve the installation efficiency of the current collector, the limiting disc has a part of the outer periphery edge exposed outside the connecting ring, and the limiting disc has a limiting convex shaft extending rearward on the part of the outer periphery edge exposed outside the connecting ring.

[0019] In order to meet the installation needs of the locking knob and save the material of the current collector, the outer periphery edge of the connecting ring has a lug portion extending outward, and the locking knob is arranged to rotate on the lug portion.

[0020] Generally, the connecting ring of the current collector can be connected with the volute through two or more locking knobs arranged in the circumferential direction, but considering the cost and the firmness of the installation, other conventional pin connection cooperation modes can be used to realize the installation of the current collector.

[0021] In order to further guarantee the firmness of the current collector installation, the two pins are arranged at the bottom of the connecting ring and extend downward.

[0022] After the pins of the current collector are installed in place, in order to enable the current collector to better abut against the outer side plate of the volute, the position where the pin is connected with the connecting ring is inclined rearward to form a limiting step.

[0023] In order to effectively prompt the locking knob to be in the locked state, further improve the installation efficiency of the current collector, the front side plate further has two positioning protrusions arranged along the circumferential direction of the locking knob on the side wall surface inside the volute, and the limiting rib is limited between the two positioning protrusions when the locking knob is in the locked state.

[0024] The technical scheme adopted by the utility model to solve the second technical problem is: a centrifugal fan, including a volute, an impeller rotating in the volute, and a motor for driving the impeller to rotate, an air inlet is arranged on the front side plate of the volute, a current collector is arranged at the air inlet, and the current collector is installed on the front side plate of the volute by using the current collector installation structure of the centrifugal fan.

[0025] The utility model solves the technical scheme that the third technical problem adopts: a range hood, fan system including the fan system adopts the centrifugal fan above.

[0026] Compared with the prior art, the utility model has the advantages that: the flow collector is connected with the front side plate of the volute by the locking knob, when the flow collector needs to be installed on the front side plate of the volute, only need to rotate a certain angle after the limiting rib of the locking knob passes through the limiting hole on the front side plate of the volute, the limiting rib can be limited on the rear side of the outer peripheral edge of the limiting hole, and cannot be taken out of the limiting hole to be in the locked state. When the flow collector needs to be disassembled, the locking knob is rotated to the position where the limiting rib is opposite to the limiting hole, so that the limiting rib can be taken out of the limiting hole to be unlocked. The locking and unlocking mode of the locking knob is more convenient for the operator to operate, the disassembly process is more labor-saving, and the loosening or loosening problem caused by the movement and vibration of the fan is not easy to occur, so that the connection reliability between the flow collector and the front side plate of the volute is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a three-dimensional structure schematic view of the centrifugal fan of the utility model embodiment;

[0028] Figure 2 It is a three-dimensional structure schematic view of the flow collector of the centrifugal fan of the utility model embodiment in the separation state;

[0029] Figure 3 It is the right view of the flow collector of the utility model embodiment;

[0030] Figure 4 It is the front view of the front side plate of the volute after installing the flow collector (the locking knob is in the unlocked state) of the utility model embodiment;

[0031] Figure 5 It is the front view of the front side plate of the volute after installing the flow collector (the locking knob is in the locked state) of the utility model embodiment;

[0032] Figure 6 It is the rear view of the front side plate of the volute after installing the flow collector (the locking knob is in the unlocked state) of the utility model embodiment;

[0033] Figure 7 It is the rear view of the front side plate of the volute after installing the flow collector (the locking knob is in the locked state) of the utility model embodiment;

[0034] Figure 8 It is the three-dimensional structure schematic view of the locking knob, the flow collector and the front side plate of the volute of the utility model embodiment in the split open state;

[0035] Figure 9A three-dimensional structure schematic view of a partial area of the current collector. DETAILED DESCRIPTION

[0036] The utility model will be described in further detail below with reference to the drawings.

[0037] In the description and claims of the utility model, terms of direction, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom" and the like, are used to describe various example structural parts and elements of the utility model, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the utility model can be arranged in different directions, these terms of direction are only used for description and should not be regarded as limitation, for example, "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0038] Figures 1-9 A preferred embodiment of the current collector mounting structure of the centrifugal fan, the centrifugal fan and the range hood of the utility model is shown. The range hood comprises a casing and a centrifugal fan arranged in the casing, and the casing generally comprises a fan frame and a smoke collecting hood arranged at the bottom of the fan frame, and the inner cavity of the fan frame is in communication with the inner cavity of the smoke collecting hood. An air inlet 110 is formed in the front side wall of the smoke collecting hood, and external smoke gas can enter the smoke collecting hood through the air inlet 110. The centrifugal fan is arranged in the fan frame, and the centrifugal fan generates negative pressure when operating, and external oil fume can be sucked into the smoke collecting hood through the air inlet 110. An oil screen is further arranged at the air inlet 110 of the smoke collecting hood for filtering oil fume.

[0039] The centrifugal fan comprises a volute 1, an impeller 21 rotatably arranged in the volute 1 and a motor 22 for driving the impeller 21 to rotate. The volute 1 comprises a front side plate 11, a rear side plate 12 and a ring wall 13 connected between the front side plate 11 and the rear side plate 12, and the air inlet 110 is formed in the front side plate 11. The air inlet 110 of the front side plate 11 of the volute 1 is provided with a current collector 3. The current collector 3 comprises a flow guide part 31 in the form of a ring and a connecting ring 32 extending radially outward from the flow guide part 31. The flow guide plate of the current collector 3 generally comprises a radial flow guide part in the form of a circular arc and an axial flow guide part extending circumferentially from the inner side of the radial flow guide part. The center opening of the flow guide part 31 of the current collector 3 is further provided with a filter screen 30. The connecting ring 32 of the current collector 3 is a flat annular plate structure, which can be attached to the outer peripheral edge of the air inlet 110 of the front side plate 11 of the volute 1.

[0040] Referring to Figure 9The outer periphery of the connecting ring 32 of the current collector 3 of the embodiment has an outwardly extending lug portion 321 at the edge thereof, and the locking knob 4 is rotatably arranged at the lug portion 321. The locking knob 4 comprises a knob body 40 and a limiting rib 44 arranged on the knob body 40. The knob body 40 comprises a limiting disc 42, a knob operating portion 41 protruding from the front side of the limiting disc 42, and a protruding column 43 extending rearward from the rear side of the limiting disc 42, wherein the knob operating portion 41 is a one-letter type knob. The lug portion 321 of the connecting ring 32 is provided with an axial hole 3210 therein for rotationally limiting the protruding column 43, and the outer peripheral wall of the protruding column 43 is provided with an annular limiting groove 430 for clamping the peripheral edge of the axial hole 3210 therein.

[0041] The protruding column 43 is sleeved with a limiting spring 45 at the root portion adjacent to the limiting disc 42. The limiting spring 45 of the embodiment is elastically stretchable in the axial direction of the protruding column 43, and the limiting spring 45 is arranged between the limiting disc 42 and the connecting ring 32. Under the action of the limiting spring 45, the axial gap of the peripheral edge of the axial hole 3210 of the connecting ring 32 that can enter the annular limiting groove 430 of the protruding column 43 can be effectively eliminated or compensated, and the problem of axial shaking of the locking knob 4 can be avoided. On the other hand, when the current collector 3 is installed on the front side plate 11 of the volute 1, the locking knob 4 is slightly pressed rearward, the limiting spring 45 can be appropriately compressed, the limiting rib 44 can smoothly pass over the edge of the limiting hole 111 of the volute 1 and rotate, and the front end of the limiting rib 44 is arranged on the rear side of the front side wall of the volute 1 after the locking knob 4 is rotated, so that the problem of shaking can be avoided and the firmness of the installation of the current collector 3 can be further ensured.

[0042] The limiting rib 44 protrudes radially outward from the peripheral wall of the protruding column 43, and a certain gap is also left between the front end of the limiting rib 44 and the limiting disc 42. In the preferred embodiment, the limiting rib 44 is in the form of a rib plate structure extending in the axial direction of the protruding column 43, and the size of the outward protrusion of the limiting rib 44 gradually increases from rear to front, that is, the outer edge of the limiting rib 44 forms a guide slope, so that the limiting rib 44 can be conveniently passed through the limiting hole 111 of the front side plate 11 of the volute 1 rearward during installation.

[0043] Referring to Figures 4-7 The front side plate 11 of the volute 1 is provided with a limiting hole 111 extending through the front and rear sides, and the limiting rib 44 of the locking knob 4 can pass through the limiting hole 111 rearward and be limited on the rear side of the peripheral edge of the limiting hole 111 of the front side plate 11 after being rotated by a certain angle. Specifically, the locking knob 4 has at least a locking state in which the limiting rib 44 is limited on the rear side of the peripheral edge of the limiting hole 111 to limit the limiting rib 44 from being pulled out of the limiting hole 111 forward, and an unlocking state in which the limiting rib 44 is moved to a position opposite to the limiting hole 111 to allow the limiting rib 44 to be pulled out of the limiting hole 111 forward, according to the change of the rotational position of the connecting ring 32.

[0044] The limiting disc 42 of the locking knob 4 has a part of the outer peripheral edge exposed outside the connecting ring 32, and the part of the outer peripheral edge of the connecting ring 32 exposed by the limiting disc 42 has a limiting protruding shaft 421 extending rearward. When the limiting protruding shaft 421 is rotated to the position abutting against the outer peripheral edge of the connecting ring 32 (at this time, the limiting position of the locking knob 4 is the limit position of the counterclockwise rotation of the locking knob 4), the limiting rib 44 of the locking knob 4 is just opposite to the limiting hole 111 of the front side plate 11 of the volute 1, that is, the locking knob 4 is in the unlocking state, thereby effectively prompting that the locking knob 4 is in the unlocking state, and improving the installation efficiency of the current collector 3. Similarly, in order to effectively prompt that the locking knob 4 is in the locking state and further improve the installation efficiency of the current collector 3, the front side plate 11 further has two positioning protrusions 112 arranged along the circumference of the locking knob 4 on the side wall surface facing the inside of the volute 1, and the limiting rib 44 is limited between the two positioning protrusions 112 when the locking knob 4 is in the locking state. The distance between the two positioning protrusions 112 is matched with the thickness of the limiting rib 44 of the locking knob 4, thereby effectively limiting the left and right swing of the limiting rib 44, so that the locking knob 4 can be stably kept in the locking state. The top of the positioning protrusion 112 can be designed as a smooth convex curved surface, so that the front end of the limiting rib 44 can smoothly pass through the opposite positioning protrusion 112 and be limited between the two positioning protrusions 112 during the rotation of the locking knob 4. The design of the limiting protrusion can also prompt the feeling of rotation to the position during the rotation of the locking knob 4, and improve the user experience.

[0045] Referring to Figure 2 and Figure 3 , the outer peripheral edge of the connecting ring 32 of the embodiment has an outwardly extending plug 322, and the front side plate 11 is provided with a positioning socket 113 for inserting the plug 322. The position where the plug 322 connects with the connecting ring 32 is inclined rearward to form a limiting step 323. After the plug 322 of the current collector 3 is installed in place, the limiting step 323 allows the current collector 3 to be deflected rearward around the plug 322, so that the connecting ring 32 of the current collector 3 is better attached to the outer side plate of the volute 1. In order to further ensure the firmness of the installation of the current collector 3, the plug 322 of the current collector 3 of the embodiment has two plugs 322, which are located at the bottom of the connecting ring 32 and extend downward. The plug 322 is arranged at the bottom of the current collector 3, which is more in line with the operation habit of the operator to install downward, and facilitates the operator to insert the plug 322 into the positioning socket 113 of the front side plate 11 of the volute 1.

[0046] The current embodiment of the current collector 3 is connected with the front side plate 11 of the volute 1 by the locking knob 4. When the current collector 3 needs to be installed on the front side plate 11 of the volute 1, only need to rotate the limiting rib 44 of the locking knob 4 through the limiting hole 111 on the front side plate 11 of the volute 1 by a certain angle, and the limiting rib 44 can be limited on the rear side of the outer peripheral edge of the limiting hole 111, and will not be forwardly out of the limiting hole 111 and be in the locked state. When the current collector 3 needs to be disassembled, the locking knob 4 is turned to the position where the limiting rib 44 is opposite to the limiting hole 111, so that the limiting rib 44 can be forwardly out of the limiting hole 111 to realize unlocking. The locking and unlocking mode by the locking knob 4 is more convenient for the operator to operate, the disassembly process is more labor-saving, and the loosening or loosening problem is not easy to occur due to the movement and vibration of the fan, so as to ensure the reliability of the connection between the current collector 3 and the front side plate 11 of the volute 1.

Claims

1. A collector mounting structure of a centrifugal fan, comprising: a volute (1) including a front side plate (11), a rear side plate (12), and a ring wall (13) connected between the front side plate (11) and the rear side plate (12), the front side plate (11) being provided with an air inlet (110); a collector (3) connected at the air inlet (110) of the front side plate (11) and including a flow guide portion (31) in the form of a ring and a connecting ring (32) extending radially outward from the flow guide portion (31); characterized in that the connecting ring (32) is further provided with a locking knob (4), the locking knob (4) including a knob main body (40) rotatably arranged on the connecting ring (32) and a limiting rib (44) arranged on the knob main body (40), the front side plate (11) being provided with a limiting hole (111) extending through the front side plate (11) and allowing the limiting rib (44) to pass through, the locking knob (4) having at least a locking state in which the limiting rib (44) is limited on the rear side of the limiting hole (111) to prevent the limiting rib (44) from being pulled out of the limiting hole (111) and an unlocking state in which the limiting rib (44) is moved to a position opposite to the limiting hole (111) to allow the limiting rib (44) to be pulled out of the limiting hole (111).

2. The centrifugal fan collector mounting structure according to claim 1, characterized by: The knob main body (40) includes a limiting disc (42), a knob operation portion (41) protruding from the front side of the limiting disc (42), and a protruding column (43) extending rearward from the rear side of the limiting disc (42), the limiting rib (44) protruding radially outward from the peripheral wall of the protruding column (43).

3. The centrifugal fan collector mounting structure according to claim 2, characterized by: The limiting rib (44) extends along the axial direction of the protruding column (43), and the dimension of the limiting rib (44) protruding outward relative to the protruding column (43) gradually increases from the rear to the front.

4. The centrifugal fan collector mounting structure according to claim 2, characterized by: The connecting ring (32) is provided with an axial hole (3210) allowing the protruding column (43) to rotate and be limited therein, and the peripheral wall of the protruding column (43) is provided with an annular limiting groove (430) allowing the peripheral edge of the axial hole (3210) to be clamped therein.

5. The centrifugal fan collector mounting structure according to claim 4, characterized in that: Further comprising a limiting spring (45) sleeved on the protruding column (43), the limiting spring (45) abutting between the limiting disc (42) and the connecting ring (32).

6. The centrifugal fan collector mounting structure according to claim 2, characterized by: The limiting disc (42) has a part of the outer periphery exposed outside the connecting ring (32), and the part of the limiting disc (42) exposed outside the connecting ring (32) is provided with a limiting protruding shaft (421) extending rearward, and in the unlocking state of the locking knob (4), the limiting protruding shaft (421) rotates with the limiting disc (42) to a position abutting against the outer periphery of the connecting ring (32).

7. The centrifugal fan collector mounting structure according to claim 1, characterized by: The connecting ring (32) is provided with a lug portion (321) extending outward at the outer periphery thereof, and the locking knob (4) is rotatably arranged on the lug portion (321).

8. The centrifugal fan collector mounting structure according to any one of claims 1 to 7, characterized by: The connecting ring (32) has outwardly extending pins (322) at the outer peripheral edge, and the front side plate (11) has positioning sockets (113) into which the pins (322) are inserted.

9. The centrifugal fan collector mounting structure according to claim 8, characterized in that: The pins (322) are two, and both extend downward from the bottom of the connecting ring (32).

10. The centrifugal fan collector mounting structure according to claim 8, characterized by: The position where the pins (322) connect with the connecting ring (32) is inclined backward to form a limiting step (323).

11. The collector mounting structure of a centrifugal fan according to any one of claims 1 to 10, characterized in that: The front side plate (11) further has two positioning protrusions (112) on the side wall surface inside the volute (1) and spaced apart along the circumference of the locking knob (4), and the limiting rib (44) is limited between the two positioning protrusions (112) when the locking knob (4) is in the locked state.

12. A centrifugal fan, comprising a volute (1), an impeller (21) rotatably arranged in the volute (1), and a motor (22) for driving the impeller (21) to rotate, a front side plate (11) of the volute (1) is provided with an air inlet (110), and a flow collector (3) is arranged at the air inlet (110), characterized in that: The collector (3) is installed on the front side plate (11) of the volute (1) by using the collector mounting structure of the centrifugal fan according to any one of claims 1-11.

13. A range hood comprising a fan system, characterized by: The fan system is the centrifugal fan according to claim 12.

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