Mounting structure of centrifugal fan and range hood

Abstract

The utility model relates to a centrifugal fan installation structure and a range hood, the centrifugal fan installation structure comprises a fan frame, the fan frame comprises a U-shaped fan frame main body, the front part of the fan frame main body is open, the fan frame main body comprises a first side plate and a second side plate which are opposite left and right, and a rear side plate connected between the first side plate and the second side plate; the centrifugal fan comprises a volute, and the volute is connected to the first side plate and the second side plate; a first support is connected to the inner side wall of the first side plate, a second support is connected to the inner side wall of the second side plate, and a third support used for being connected with the first support and a fourth support used for being connected with the second support are arranged on a cover plate, facing the front opening of the fan frame body, of the volute. The utility model has the advantages of high appearance delicacy and convenience in assembly.

Description

TECHNICAL FIELD

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

[0002] Range hood is a kind of kitchen appliance for purifying kitchen environment.Range hood generally includes casing and centrifugal fan arranged in casing, and the casing includes fan frame and fume hood connected below fan frame, and the centrifugal fan is arranged in fan frame.At present, the installation mode of centrifugal fan is generally fixed by screw, that is, punching is carried out on the side plate of fan frame, and the volute support of centrifugal fan is connected with fan frame (side) by screw, so that there are many exposed screw heads on the outer surface of fan frame and fan cover, which destroys the appearance beauty, and in order to improve the appearance delicacy, a fan cover is usually installed outside fan frame to shield exposed screw, which increases production cost.

[0003] In order to solve the above technical problems, the utility model discloses a kind of fan frame of range hood and application has the range hood of this fan frame of Chinese utility model patent application No.CN202220351269.4 (authorized announcement No.CN217002414U), the fan frame includes front plate, back plate, left plate, right plate and top plate, the top plate and back plate are integrally formed to constitute the first part of fan frame, the left plate, front plate and right plate are integrally formed to constitute the second part of fan frame, and the connecting part of the first part and the second part is located on the top plate.The above structure design makes that common part of fan frame cannot be seen screw or hole by user, and it is not necessary to configure separate fan cover or decorative cover such purely decorative ugly parts, which reduces cost and also releases space.But the fan frame in the patent application still has certain deficiencies, the first part of the top plate and the back plate are integrally formed into L type, when assembling, it is necessary to ensure that the back plate and the corresponding part of the second part are centered, so as to be successfully assembled, the assembling process is relatively complicated, and since the first part of L type has relatively large volume, interference problem with other parts is inevitable, which reduces the assembling efficiency. UTILITY MODEL CONTENTS

[0004] The first technical problem to be solved by the utility model is to provide an installation structure of centrifugal fan with high appearance delicacy and convenient assembly according to the status of prior art.

[0005] The second technical problem to be solved by the utility model is to provide a range hood applying the above installation structure of centrifugal fan according to the status of prior art.

[0006] The technical scheme adopted by the utility model to solve the first technical problem is as follows: an installation structure of centrifugal fan, comprising:

[0007] The fan frame comprises a fan frame body which is integrally U-shaped and has an open front part, and the fan frame body comprises left and right first and second side plates and a rear side plate connected between the first and second side plates;

[0008] The centrifugal fan comprises a volute connected to the first and second side plates;

[0009] The first side plate is connected to a first bracket on an inner side wall thereof, the second side plate is connected to a second bracket on an inner side wall thereof, and the volute is provided with a third bracket for connecting to the first bracket and a fourth bracket for connecting to the second bracket on a side cover plate of the fan frame body which is open at the front part.

[0010] As an improvement, the first and second brackets are connected to the first and second side plates by welding. It is conceivable that the first and second brackets can also be connected to the corresponding first and second side plates by integral molding.

[0011] In order to ensure the firmness of the connection between the first and second brackets and the corresponding side plates, the first bracket is integrally L-shaped and comprises a first vertical plate which is connected to the inner side wall of the first side plate and a first horizontal plate which is bent and extends from the first vertical plate towards the side where the second side plate is located, and the first horizontal plate is connected to the third bracket by a first fastener.

[0012] The second bracket is integrally L-shaped and comprises a second vertical plate which is connected to the inner side wall of the second side plate and a second horizontal plate which is bent and extends from the second vertical plate towards the side where the first side plate is located, and the second horizontal plate is connected to the fourth bracket by a second fastener. The above structure design makes the first and second brackets have sufficient contact surfaces with the corresponding side plates to achieve more reliable welding therebetween, and the corresponding first and second horizontal plates can be fitted with the third and fourth brackets on the volute.

[0013] In order to facilitate the first horizontal plate of the first bracket and the second horizontal plate of the second bracket to be successfully and accurately centered with the corresponding third and fourth brackets and connected by the corresponding fasteners, the first vertical plate further has a first guide boss protruding into the fan frame towards the side where the second side plate is located, the second vertical plate further has a second guide boss protruding into the fan frame towards the side where the first side plate is located, the third bracket adjacent to the side of the first side plate has a first stop edge whose extension direction is parallel to the first side plate, and the top surface of the first stop edge abuts against the top surface of the first guide boss, and the fourth bracket adjacent to the side of the second side plate has a second stop edge whose extension direction is parallel to the second side plate, and the top surface of the second stop edge abuts against the top surface of the second guide boss.

[0014] As an improvement, the sidewalls of both the first and second guide bosses are conical structures whose dimensions gradually decrease from the root to the top. During the process of the centrifugal fan sliding into the fan frame from the side, the conical structures of the first and second guide bosses act as guides, allowing the third and fourth supports to smoothly slide into their designated positions.

[0015] In order to limit the third and fourth supports in the front-back direction so that they can be as close as possible to the corresponding first and second horizontal plates, thereby facilitating the installation of fasteners, the first vertical plate has a first limiting baffle extending into the wind turbine frame on the side facing the second side plate to restrict the movement of the third support towards the side where the rear side plate is located. The second vertical plate also has a second limiting baffle extending into the wind turbine frame on the side facing the first side plate to restrict the movement of the fourth support towards the side where the rear side plate is located.

[0016] In order to achieve the function of limiting movement in the front and rear directions, and to avoid jamming during the installation of the centrifugal fan due to excessive protrusion of the second end of the first limiting baffle and the second limiting baffle, the first limiting baffle has a first end with an opening adjacent to the main body of the fan frame and a second end with an opening away from the main body of the fan frame. The protrusion height of the first limiting baffle gradually increases from its second end to its first end, and the protrusion height of the first end of the first limiting baffle is greater than the protrusion height of the first guide boss, while the protrusion height of the second end of the first limiting baffle is less than the protrusion height of the first guide boss.

[0017] The second limiting baffle has a first end with an opening adjacent to the main body of the wind turbine frame and a second end with an opening away from the main body of the wind turbine frame. The protrusion height of the second limiting baffle gradually increases from its second end to its first end. The protrusion height of the first end of the second limiting baffle is greater than the protrusion height of the second guide boss, while the protrusion height of the second end of the second limiting baffle is less than the protrusion height of the second guide boss.

[0018] As an improvement, to ensure the reliable installation of the centrifugal fan, an air outlet plate connected to the top of the fan frame is also included. The air outlet plate has an opening, and the air outlet of the volute is connected to the periphery of the opening of the air outlet plate.

[0019] To avoid affecting the overall aesthetics of the range hood by connecting the fan cover plate and the fan frame body with screws visible from the side, the fan frame also includes a fan cover plate connected to the front opening of the fan frame body. A fifth bracket and a sixth bracket are welded to the inner wall of the fan cover plate. The fifth bracket has a first hook extending toward the inside of the fan frame, and the sixth bracket has a second hook extending toward the inside of the fan frame. The front edge of the first side plate of the fan frame body has a first folded edge extending toward the second side plate. The first folded edge has a first groove for the first hook to pass through and be limited therein. The front edge of the second side plate of the fan frame body has a second folded edge extending toward the first side plate. The second folded edge has a second groove for the second hook to pass through and be limited therein.

[0020] As an improvement, an air outlet plate is also included attached to the top of the fan frame. The top of the fan cover plate also has a flange that folds inward toward the fan frame. The flange rests above the side edge of the air outlet plate and is connected by a third fastener.

[0021] Considering the need for sound absorption and noise reduction, sound-absorbing boxes are often installed inside the fan frame. To facilitate the installation of the sound-absorbing boxes and avoid using screws close to the side for connection, a seventh bracket for installing the sound-absorbing box device is also welded on the inner wall of the fan cover.

[0022] The technical solution adopted by this utility model to solve the second technical problem is: a range hood, including the above-mentioned centrifugal fan installation structure.

[0023] Compared with the prior art, the advantages of this utility model are as follows: First and second supports are provided on the inner walls of the first and second side plates of the fan frame body. These supports are then connected to the third and fourth supports on the centrifugal fan casing. This avoids the need for screw holes on the corresponding first and second side plates, ensuring the overall aesthetics and refinement of the range hood. Furthermore, the third and fourth supports on the centrifugal fan casing are arranged on the cover plate facing the front opening of the fan frame body. Because the front of the fan frame body is open, there is sufficient operating space, allowing operators to easily perform installation operations at the opening, thus improving assembly efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the installation structure of the centrifugal fan according to an embodiment of the present utility model;

[0025] Figure 2 This is an exploded view of the installation structure of the centrifugal fan according to an embodiment of the present utility model;

[0026] Figure 3This is a three-dimensional structural diagram of the back of the fan cover plate according to an embodiment of the present utility model;

[0027] Figure 4 This is a three-dimensional structural diagram of the centrifugal fan installation structure of this embodiment of the present invention, omitting the fan cover plate;

[0028] Figure 5 This is a three-dimensional structural diagram of the inner side of the first side plate in an embodiment of the present utility model;

[0029] Figure 6 This is a three-dimensional structural diagram of the centrifugal fan installation structure from another angle, omitting the fan cover plate, according to an embodiment of the present utility model.

[0030] Figure 7 This is a three-dimensional structural diagram of the inner side of the second side plate according to an embodiment of the present utility model;

[0031] Figure 8 This is a bottom view of the main body of the wind turbine frame according to an embodiment of the present utility model;

[0032] Figure 9 The following is a bottom view of the centrifugal fan installation structure of this embodiment of the present invention, omitting the fan cover plate. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0035] Figures 1-9 The present invention illustrates the installation structure of the centrifugal fan and a preferred embodiment of the range hood.

[0036] The centrifugal fan mounting structure includes a fan frame, an outlet plate 24, and a centrifugal fan housed within the fan frame. The fan frame includes a main body and a fan cover plate 10. The main body of the fan frame is generally U-shaped, and includes a first side plate 21 and a second side plate 22 facing each other, as well as a rear side plate 23 connecting the rear edge of the first side plate 21 and the rear edge of the second side plate 22.

[0037] The front edge of the first side plate 21 of the wind turbine frame body has a first flange 211 extending toward the second side plate 22, and the front edge of the second side plate 22 has a second flange 221 extending toward the first side plate 21. A first slot 2110 is provided on the first flange 211, such as... Figure 2 As shown, there are two first slots 2110 arranged sequentially along the length of the first folded edge 211. A second slot 2210 is provided on the second folded edge 221, and there are also two second slots 2210 arranged sequentially along the length of the second folded edge 221. A fifth bracket 12 and a sixth bracket 13 are welded to the inner wall of the fan cover plate 10 at positions corresponding to the aforementioned first slots 2110 and second slots 2210. The fifth bracket 12 has a first hook 121 extending into the fan frame, and the sixth bracket 13 has a second hook 131 extending into the fan frame. A first slot 2110 is provided on the first folded edge 211 for the first hook 121 to pass through and be confined therein, and a second slot 2210 is provided on the second folded edge 221 for the second hook 131 to pass through and be confined therein. Both the first hook 121 and the second hook 131 are insert structures that extend forward and backward, with a downwardly protruding hook at the bottom of the insert. Correspondingly, the first slot 2110 and the second slot 2210 are strip-shaped slots adapted to the inserts. After the first hook 121 and the second hook 131 are inserted into the corresponding first slot 2110 and second slot 2210, they can be prevented from moving forward.

[0038] See Figure 2 The air outlet plate 24 is connected to the top of the fan frame and has an opening 240. The air outlet of the centrifugal fan casing 40 is connected to the periphery of the opening 240 of the air outlet plate 24. The top of the fan cover plate 10 also has a flange 11 that folds inward toward the fan frame. The flange 11 rests above the side edge of the air outlet plate 24 and is connected by a third fastener 63, which can be a screw.

[0039] During installation, the fan cover plate 10 can be placed at the front opening of the fan frame body, so that the first hook 121 and the second hook 131 slide down and engage with the corresponding first slot 2110 and second slot 2210. Finally, two screws are fixed at the top of the fan frame, that is, at the position of the flange 11 between the air outlet plate 24 and the fan cover plate 10. These two screws are on the top surface of the fan frame, so they are not visible from the front, ensuring aesthetics.

[0040] Considering the need for sound absorption and noise reduction, sound-absorbing boxes are often installed inside the fan frame. To facilitate the installation of the sound-absorbing boxes and avoid using screws close to the side for connection, a seventh bracket 14 for installing the sound-absorbing box device is welded to the inner wall of the fan cover 10. Figure 3The mounting bracket 50 of the sound-absorbing box device is shown connected to the seventh bracket 14 on the inner side of the fan cover plate 10.

[0041] The centrifugal fan includes a volute 40, an impeller, and a motor. The impeller is housed within the volute 40 and is driven to rotate by the motor. The axis of the impeller extends in the front-to-back direction. The volute 40 includes two opposing cover plates and an annular wall connecting the two cover plates. A third support 41 and a fourth support 42 are provided on the front open side cover plate of the volute 40 facing the fan frame body. Both the third support 41 and the fourth support 42 are plate-like structures, and their extension direction is substantially parallel to the front cover plate of the volute 40.

[0042] The volute 40 is connected to the first side plate 21 and the second side plate 22 via the third bracket 41 and the fourth bracket 42. Specifically, the first bracket 31 is connected to the inner wall of the first side plate 21, the second bracket 32 ​​is connected to the inner wall of the second side plate 22, the third bracket 41 on the volute 40 is connected to the first bracket 31, and the fourth bracket 42 on the volute 40 is connected to the second bracket 32.

[0043] See Figures 4-8The first bracket 31 is L-shaped and includes a first vertical plate 311 that fits against the inner wall of the first side plate 21 and a first horizontal plate 312 that bends and extends from the first vertical plate 311 toward the side where the second side plate 22 is located. The extension direction of the first horizontal plate 312 is the same as the extension direction of the third bracket 41. After they fit together, they are connected by a first fastener 61, which can be a screw. The side of the first vertical plate 311 facing the second side plate 22 also has a first guide boss 3111 protruding toward the fan frame. The side wall of the first guide boss 3111 is a tapered structure whose size gradually decreases from its root to its top. The side of the third bracket 41 adjacent to the first side plate 21 has a first stop that extends parallel to the first side plate 21. During centrifugal fan installation, the first stop of the third bracket 41 can abut against the top surface of the first guide boss 3111, thereby achieving alignment of the corresponding connecting holes on the third bracket 41 and the first bracket 31. The first vertical plate 311 also has a first limiting baffle 3112 extending inward toward the wind turbine frame on the side facing the second side plate 22, to restrict the movement of the third support 41 toward the side where the rear side plate 23 is located. The first limiting baffle 3112 is a long strip extending in the front-rear direction, and there is a certain distance between it and the first vertical plate 311, which can be slightly larger than the thickness of the third support 41. Specifically, the first limiting baffle 3112 has a first end with an opening adjacent to the main body of the wind turbine frame and a second end with an opening away from the main body of the wind turbine frame. The protrusion height of the first limiting baffle 3112 gradually increases from its second end to its first end, and the protrusion height of the first end of the first limiting baffle 3112 is greater than the protrusion height of the first guide boss 3111, while the protrusion height of the second end of the first limiting baffle 3112 is less than the protrusion height of the first guide boss 3111. The conical structure of the first guide boss 3111 serves as a guide, allowing the third support 41 of the centrifugal fan to slide smoothly to the set position. The protrusion height of the second end of the first limiting baffle 3112 is less than that of the first guide boss 3111, preventing jamming during the movement of the third support 41. Conversely, the protrusion height of the first end of the first limiting baffle 3112 is greater than that of the first guide boss 3111, providing limitation or support after the third support 41 has moved into position.

[0044] Similarly, the second bracket 32 ​​is generally L-shaped, including a second vertical plate 321 that fits and connects to the inner wall of the second side plate 22, and a second horizontal plate 322 that bends and extends from the second vertical plate 321 toward the side where the first side plate 21 is located. The second horizontal plate 322 is connected to the fourth bracket 42 by a second fastener 64. The extension direction of the second horizontal plate 322 is the same as the extension direction of the fourth bracket 42, and the two are connected by the second fastener 64 after fitting together. The second fastener 64 can be a screw. The side of the second vertical plate 321 facing the first side plate 21 also has a second guide boss 3211 protruding toward the inside of the fan frame. The side wall of the second guide boss 3211 is a tapered structure whose size gradually decreases from its root to its top. The side of the fourth bracket 42 adjacent to the second side plate 22 has a second stop whose extension direction is parallel to the second side plate 22. During centrifugal fan installation, the second stop edge of the fourth bracket 42 can be aligned with the top surface of the second guide boss 3211, thereby achieving alignment of the corresponding connecting holes on the fourth bracket 42 and the second bracket 32. The side of the second vertical plate 321 facing the first side plate 21 also has a second limiting baffle 3212 extending into the fan frame to restrict the movement of the fourth bracket 42 toward the side where the rear side plate 23 is located. The second limiting baffle 3212 is a long strip extending in the front-rear direction, and there is a certain distance between it and the second vertical plate 321, which can be slightly larger than the thickness of the fourth bracket 42. Specifically, the second limiting baffle 3212 has a first open end adjacent to the main body of the fan frame and a second open end away from the main body of the fan frame. The protrusion height of the second limiting baffle 3212 gradually increases from its second end to its first end, and the protrusion height of the first end of the second limiting baffle 3212 is greater than the protrusion height of the second guide boss 3211, while the protrusion height of the second end of the second limiting baffle 3212 is less than the protrusion height of the second guide boss 3211. The conical structure of the second guide boss 3211 can serve as a guide, allowing the fourth support 42 of the centrifugal fan to slide smoothly to the set position. The fact that the protrusion height of the second end of the second limiting baffle 3212 is less than the protrusion height of the second guide boss 3211 can prevent jamming during the movement of the fourth support 42. The fact that the protrusion height of the first end of the second limiting baffle 3212 is greater than the protrusion height of the second guide boss 3211 can limit or support the fourth support 42 after it has moved into place.

[0045] The centrifugal fan mounting mechanism of this embodiment allows the centrifugal fan to be installed either "side-lying" or "flat-lying." "Side-lying" installation means the opening of the fan frame body faces to the side (left or right), while "flat-lying" installation means the opening of the fan frame body faces upwards. During side-lying installation, the screw holes on the corresponding bracket are not affected by the gravity of the fan system. During flat-lying installation, the first limiting baffle 3112 and the second limiting baffle 3212 on the fan frame can be used for positioning, ensuring the screw holes are aligned.

[0046] The specific installation process for a side-lying position is as follows:

[0047] The first step is to lay the fan frame on its side, so that the pre-assembled centrifugal fan is inserted into the fan frame from right to left, and the air outlet of the volute 40 is aligned with the air outlet plate 24 on the top of the fan frame.

[0048] Step 2: Use 4 screws to fix the air outlet of the volute 40 to the periphery of the opening 240 of the air outlet plate 24.

[0049] Step 3: Push the centrifugal fan towards the side opening of the fan frame, so that the third bracket 41 and the fourth bracket 42 on the volute 40 climb onto the corresponding guide bosses on the first bracket 31 and the second bracket 32 ​​on the fan frame. After they are in place, the holes on the first bracket 31 and the second bracket 32 ​​will align with those on the third bracket 41 and the fourth bracket 42 of the volute 40. In addition, the first limiting baffle 3112 on the first bracket 31 and the second limiting baffle 3212 on the second bracket 32 ​​of the fan frame will restrict the third bracket 41 and the fourth bracket 42 from moving back, thus providing a good positioning effect.

[0050] Step 4: Drive in the corresponding fixing screws from the opening 240 side of the wind turbine frame body to connect the first bracket 31 with the third bracket 41 and the second bracket 32 ​​with the fourth bracket 42.

[0051] As can be seen from the above installation steps, when the third step is completed, the fan system is limited in the vertical direction by the first guide boss 3111 and the second guide boss 3211 on the first bracket 31, and in the front-back direction by the first limiting baffle 3112 of the first bracket 31 and the second limiting baffle 3212 of the second bracket 32. The left-right direction is limited by the fixing screws in the second step. Therefore, the positioning accuracy of the screw holes between the corresponding brackets is relatively high at this time, and screw installation can be convenient.

[0052] The installation process for lying flat is basically the same as that for lying on your side, with the following differences:

[0053] The wind turbine frame should be placed flat, meaning the opening of the main body of the wind turbine frame should face upwards.

[0054] Another point is that the lower end of the fan frame must first be connected to the smoke collection hood of the range hood to ensure that the width of the fan frame does not change significantly. This ensures that the first limiting baffle 3112 and the second limiting baffle 3212 on the corresponding bracket of the fan frame can support the centrifugal fan and prevent it from falling down.

[0055] This embodiment also relates to a range hood, which includes the aforementioned centrifugal fan mounting structure.

Claims

1. An installation structure for a centrifugal fan, comprising: The wind turbine frame includes a wind turbine frame body that is U-shaped and open at the front. The wind turbine frame body includes a first side plate (21) and a second side plate (22) that are opposite to each other on the left and right sides, and a rear side plate (23) connected between the first side plate (21) and the second side plate (22). Centrifugal fan, including a volute (40) connected to the first side plate (21) and the second side plate (22); The feature is that: a first bracket (31) is connected to the inner wall of the first side plate (21), a second bracket (32) is connected to the inner wall of the second side plate (22), and a third bracket (41) for connecting with the first bracket (31) and a fourth bracket (42) for connecting with the second bracket (32) are provided on the side cover of the volute (40) facing the front opening of the wind turbine frame body.

2. The installation structure of the centrifugal fan according to claim 1, characterized in that: The first bracket (31) and the second bracket (32) are both connected to the first side plate (21) and the second side plate (22) by welding.

3. The installation structure of the centrifugal fan according to claim 2, characterized in that: The first bracket (31) is L-shaped in general, and includes a first vertical plate (311) that can be attached to the inner wall of the first side plate (21) and a first horizontal plate (312) that bends and extends from the first vertical plate (311) toward the side where the second side plate (22) is located. The first horizontal plate (312) is connected to the third bracket (41) by a first fastener (61). The second bracket (32) is L-shaped in general. It includes a second vertical plate (321) that can be attached to the inner wall of the second side plate (22) and a second horizontal plate (322) that bends and extends from the second vertical plate (321) toward the side where the first side plate (21) is located. The second horizontal plate (322) is connected to the fourth bracket (42) by a second fastener (64).

4. The installation structure of the centrifugal fan according to claim 3, characterized in that: The first vertical plate (311) has a first guide boss (3111) protruding into the fan frame on the side facing the second side plate (22), and the second vertical plate (321) has a second guide boss (3211) protruding into the fan frame on the side facing the first side plate (21). The third bracket (41) has a first stop edge whose extension direction is parallel to the first side plate (21) on the side adjacent to the first side plate (21), and the first stop edge abuts against the top surface of the first guide boss (3111). The fourth bracket (42) has a second stop edge whose extension direction is parallel to the second side plate (22) on the side adjacent to the second side plate (22), and the second stop edge abuts against the top surface of the second guide boss (3211).

5. The installation structure of the centrifugal fan according to claim 4, characterized in that: The sidewalls of the first guide boss (3111) and the second guide boss (3211) are both conical structures whose dimensions gradually decrease from the root to the top.

6. The installation structure of the centrifugal fan according to claim 4, characterized in that: The first vertical plate (311) has a first limiting baffle (3112) extending into the wind turbine frame on the side facing the second side plate (22) to restrict the movement of the third support (41) toward the side where the rear side plate (23) is located. The second vertical plate (321) has a second limiting baffle (3212) extending into the wind turbine frame on the side facing the first side plate (21) to restrict the movement of the fourth support (42) toward the side where the rear side plate (23) is located.

7. The installation structure of the centrifugal fan according to claim 6, characterized in that: The first limiting baffle (3112) has a first end with an opening adjacent to the main body of the wind turbine frame and a second end with an opening away from the main body of the wind turbine frame. The protrusion height of the first limiting baffle (3112) gradually increases from its second end to its first end. The protrusion height of the first end of the first limiting baffle (3112) is greater than the protrusion height of the first guide boss (3111), while the protrusion height of the second end of the first limiting baffle (3112) is less than the protrusion height of the first guide boss (3111). The second limiting baffle (3212) has a first end with an opening adjacent to the main body of the wind turbine frame and a second end with an opening away from the main body of the wind turbine frame. The protrusion height of the second limiting baffle (3212) gradually increases from its second end to its first end. The protrusion height of the first end of the second limiting baffle (3212) is greater than the protrusion height of the second guide boss (3211), while the protrusion height of the second end of the second limiting baffle (3212) is less than the protrusion height of the second guide boss (3211).

8. The installation structure of the centrifugal fan according to any one of claims 1 to 7, characterized in that: It also includes an air outlet plate (24) connected to the top of the fan frame, the air outlet plate (24) having an opening (240), and the air outlet of the volute (40) being connected to the periphery of the opening (240) of the air outlet plate (24).

9. The installation structure of the centrifugal fan according to any one of claims 1 to 7, characterized in that: The wind turbine frame also includes a wind turbine cover plate (10) connected to the front opening of the wind turbine frame body. A fifth bracket (12) and a sixth bracket (13) are welded to the inner wall of the wind turbine cover plate (10). The fifth bracket (12) has a first hook (121) extending toward the inside of the wind turbine frame, and the sixth bracket (13) has a second hook (131) extending toward the inside of the wind turbine frame. The front edge of the first side plate (21) of the wind turbine frame body has a hook extending toward the... The first fold (211) extending from the second side plate (22) has a first groove (2110) for the first hook (121) to pass through and be limited therein. The front edge of the second side plate (22) of the main body of the fan frame has a second fold (221) extending toward the first side plate (21). The second fold (221) has a second groove (2210) for the second hook (131) to pass through and be limited therein.

10. The installation structure of the centrifugal fan according to claim 9, characterized in that: It also includes an air outlet plate (24) connected to the top of the fan frame, and the top of the fan cover plate (10) also has a flange (11) that folds inward toward the fan frame. The flange (11) rests above the side edge of the air outlet plate (24) and is connected by a third fastener (63).

11. The installation structure of the centrifugal fan according to claim 9, characterized in that: The inner wall of the fan cover (10) is also welded with a seventh bracket (14) for installing the sound-absorbing box device.

12. A range hood, characterized in that: The mounting structure includes any one of claims 1 to 11 for the centrifugal fan.

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