Centrifugal fan volute support assembly and centrifugal fan

Abstract

The utility model relates to a kind of support assembly and centrifugal fan for centrifugal fan volute, support assembly includes support main body and suction cup component, support main body includes first connecting base plate, multiple mounting channels are opened in first connecting base plate, suction cup component includes operating plate, piston rod, suction cup and axial telescopic elastic telescopic pipe, suction cup is located in the side of the first side of first connecting base plate, operating plate is located in the side of the second side of first connecting base plate, operating hole is opened in operating plate, valve port is formed on the inner wall of operating hole, elastic telescopic pipe is arranged in the mounting channel, the first end of elastic telescopic pipe is connected with the suction cup, and with the internal space of suction cup communication, the second end of elastic telescopic pipe is connected with operating plate, and with corresponding operating hole on operating plate communication, piston rod is movably limited in operating hole, and opens and closes valve port.Advantage lies in: can adapt to different types of fan machine case and good damping effect.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to a support assembly for a centrifugal fan volute and a centrifugal fan. Background Technology

[0002] Centrifugal fans are a key component of range hoods. To improve the user experience, existing range hoods have relatively strict vibration and noise control. Traditional centrifugal fans typically use a hard-contact mounting method between the sheet metal bracket on the back of the volute and the casing. Vibration of the volute is directly transmitted to the casing, easily causing resonance throughout the range hood and generating significant abnormal noise, resulting in a poor user experience. The aforementioned fixed structure of the traditional volute bracket also cannot dynamically adjust its size according to different fan models, leading to relatively poor adaptability. Furthermore, the fan volute bracket is prone to structural failure under high pressure and high vibration conditions, and the step-by-step molding process and passive vibration damping design cannot meet the dual requirements of efficiency and reliability in industrial settings. Most brackets rely on passive vibration damping designs (such as rubber pads or springs), which cannot suppress high-frequency vibrations in real time. For example, Chinese utility model patent application CN201921759900.9, entitled "A Volute Mounting Bracket," discloses a similar passive vibration damping structure design.

[0003] Therefore, the existing support assembly for centrifugal fan casings needs further improvement. Utility Model Content

[0004] The first technical problem to be solved by this utility model is to provide a support assembly for centrifugal fan volutes that can be adapted to different types of chassis and has a good vibration reduction effect, in light of the current state of the technology.

[0005] The second technical problem to be solved by this utility model is to provide a centrifugal fan that adopts the above-mentioned volute support assembly, in view of the current status of the prior art.

[0006] The technical solution adopted by this utility model to solve the first technical problem is as follows: a support assembly for a centrifugal fan volute, including a support body and a suction cup assembly connected to the support body. The support body includes a first connecting base plate, which has a first side facing the component to be installed and a second side away from the component to be installed. The first connecting base plate has a plurality of mounting channels extending from its first side to its second side. The suction cup assembly includes an operating plate, a piston rod, a suction cup, and an axially retractable elastic telescopic tube. The suction cup is located on the side of the first connecting base plate where the first side is located, and the operating plate is located on the side of the second side of the first connecting base plate. The operating plate has an operating hole, and a valve port is formed on the inner wall of the operating hole. The elastic telescopic tube passes through the mounting channel. The first end of the elastic telescopic tube is connected to the suction cup and communicates with the internal space of the suction cup. The second end of the elastic telescopic tube is connected to the operating plate and communicates with the corresponding operating hole on the operating plate. The piston rod is movably limited in the operating hole and opens and closes the valve port.

[0007] As an improvement, an annular groove is formed on the outer peripheral wall of the piston rod near its free end, and a first sealing flange and a second sealing flange are formed on opposite sides of the annular groove. The second sealing flange can extend into the inner cavity of the elastic telescopic tube and form a seal with the inner peripheral wall of the inner cavity of the elastic telescopic tube. The first sealing flange can abut against the outer peripheral edge of the valve port to form a seal. The inner cavity of the elastic telescopic tube also has an outwardly recessed pressure relief chamber at a position corresponding to the annular groove of the piston rod, and the pressure relief chamber is located outside the annular groove. The annular groove and the pressure relief chamber cooperate to achieve rapid pressure relief and adsorption release; the double sealing flange design enhances sealing reliability and prevents air leakage during operation.

[0008] Considering that multi-suction cup assemblies require individual operation of the piston rods, which is inefficient and prone to asynchrony, all the piston rods are arranged sequentially on the same straight line, and the outer ends of each piston rod are connected by a crossbar to form a single unit. The crossbar links all the piston rods, enabling one-button synchronous operation; on the other hand, it also simplifies the structure and improves ease of operation and installation efficiency.

[0009] Considering that the easy displacement of the operating plate may lead to misalignment between the piston rod and the valve port, resulting in sealing failure, a mounting groove is also provided on the second side of the first connecting base plate, recessed towards its first side. The shape of the operating plate is adapted to the shape of the mounting groove, and the operating plate is movable and limited within the mounting groove along the axial direction of the piston rod. The mounting groove precisely limits the operation plate, ensuring that the piston rod and the valve port are aligned; it also avoids displacement caused by external force collisions, improving system stability.

[0010] As an improvement, the elastic telescopic tube is made of silicone. In particular, silicone tubes with a certain wall thickness are preferred.

[0011] To facilitate connection with the sidewall of the casing and ensure that the suction cup assembly on the first connecting base plate can effectively adhere to the inner sidewall of the chassis, the main body of the bracket also includes a second connecting base plate connected to the first connecting base plate, the second connecting base plate being perpendicular to the first connecting base plate. The L-shaped bracket main body structure enhances spatial adaptability and can fit snugly against the sidewall of the casing.

[0012] To ensure the overall strength of the support body, the second connecting base plate and the first connecting base plate are provided with reinforcing ribs at the connection position.

[0013] The technical solution adopted by this utility model to solve the second technical problem is: a centrifugal fan, including a volute and a connecting bracket detachably connected to the side wall of the volute, wherein the connecting bracket adopts the above-mentioned centrifugal fan volute bracket assembly.

[0014] Compared with existing technologies, the advantages of this invention are as follows: The suction cup assembly forms a closed negative pressure air chamber, utilizing the axial expansion and contraction characteristics of the elastic telescopic tube to absorb multidimensional vibration energy, directly cutting off the hard transmission path between the volute and the chassis. Compared with passive rubber pads, this structure actively dissipates high-frequency vibrations through the air cushion effect, effectively suppressing resonance. The elastic telescopic tube has axial free travel, allowing the suction cup to conform to chassis walls of different thicknesses / curvatures. During installation, only pressing the operation panel triggers negative pressure adsorption, eliminating the need for customized hole matching, improving compatibility, and adapting to various fan models. The integrated pneumatic sealing structure avoids the risk of bolt loosening in split brackets; the piston rod control valve port achieves "one-click adsorption / release," effectively improving disassembly and assembly efficiency, maintaining stable adsorption force under high-pressure conditions, and preventing structural failure. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the centrifugal fan according to an embodiment of the present utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the bracket assembly according to an embodiment of the present utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the bracket assembly from another angle according to an embodiment of the present utility model;

[0018] Figure 4 This is a cross-sectional view of the bracket assembly according to an embodiment of the present utility model, with the suction cup assembly in a sealed state;

[0019] Figure 5 This is a partial cross-sectional view of the bracket assembly according to an embodiment of the present invention, showing the suction cup assembly in a deflated state. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] 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.

[0022] Figures 1-5 This invention illustrates a preferred embodiment of the centrifugal fan casing support assembly and the centrifugal fan of the present invention. The centrifugal fan casing support assembly includes a support body 1 and a suction cup assembly. The support body 1 is composed of a first connecting base plate 11 and a second connecting base plate 12. The first connecting base plate 11 is a rectangular plate structure with a first side 111 facing the inner wall of the casing and a second side 112 facing away from the casing. The first connecting base plate 11 has a plurality of circular mounting holes 110 penetrating the first side 111 and the second side 112, which are spaced apart sequentially along the length of the first connecting base plate 11. The second connecting base plate 12 is vertically fixedly connected to the first connecting base plate 11, forming an L-shaped structure; triangular reinforcing ribs 13 are provided at the connection point to enhance the overall rigidity. The second connecting base plate 12 is used for detachable mounting to the side wall of the centrifugal fan casing 30 by bolts.

[0023] See Figure 4 and Figure 5 The suction cup assembly includes an operation plate 21, a piston rod 221, a suction cup 24, and an elastic telescopic tube 23. The suction cup 24 is made of bowl-shaped silicone material and is located on one side 111 of the first connecting substrate 11, with its open end facing the inner wall of the chassis. The elastic telescopic tube 23 is a silicone tube with a certain wall thickness, possessing axial telescopic characteristics (the telescopic range is generally 5–20 mm), and is inserted into the mounting hole 110 of the first connecting substrate 11. The first end of the elastic telescopic tube 23 is bonded and fixed to the center of the suction cup 24 and communicates with the internal space of the suction cup 24; the second end extends to one side 112 of the second connecting substrate 11.

[0024] The operating plate 21 is a rectangular plate located on one side of the second side 112 of the first connecting base plate 11. Multiple operating holes 210 are formed on the operating plate 21 (the number is the same as the number of suction cups 24 and elastic telescopic tubes 23). An annular valve port 211 is machined on the inner wall of each operating hole 210 near its port. The operating plate 21 is fixed by bonding to the second end of the elastic telescopic tube 23, allowing the operating holes 210 to communicate with the inner cavity of the elastic telescopic tube 23. The piston rod 221 can be a cylindrical metal rod, movably inserted into the operating hole 210, and can move axially. The free end of the piston rod 221 (the end away from the crossbar 22) has an annular groove 2210, with a first sealing flange 2211 and a second sealing flange 2212 formed on both sides of the groove. The first sealing flange 2211 abuts against the outer periphery of the valve port 211 to achieve a seal, and the second sealing flange 2212 can simultaneously be inserted into the inner cavity of the elastic telescopic tube 23 and form a seal with an interference fit to the inner wall. The inner cavity of the elastic telescopic tube 23 is provided with an annular pressure relief chamber 230 (radially concave outward) corresponding to the position of the annular groove 2210. When the piston rod 221 moves, the annular groove 2210 communicates with the pressure relief chamber 230 to achieve pressure relief.

[0025] See Figure 2 and Figure 3 In this embodiment, multiple piston rods 221 are coaxially arranged in a straight line, and their outer ends are welded and fixed by a metal crossbar 22 to form a single piece. The second side 112 of the first connecting base plate 11 is machined with a rectangular mounting groove 113. The operating plate 21 is embedded in the groove and can slide along the axial direction of the piston rod 221 to ensure that the piston rod 221 is always aligned with the valve port 211.

[0026] See Figure 1 This embodiment also relates to a centrifugal fan, which includes a volute 30 and the aforementioned support assembly. The sidewall of the volute 30 is connected to the second connecting base plate 12 of the support body 1 by bolts. During installation, the operating plate 21 can be pressed towards the inner wall of the casing, the suction cup 24 adheres to the inner wall of the casing, and the crossbar 22 is pushed to drive all piston rods 221 to move inward synchronously. At this time, the first sealing edge 2211 seals and adheres to the valve port 211, and the second sealing edge 2212 enters the inner cavity of the elastic telescopic tube 23 to form a secondary seal. A negative pressure is formed in the suction cup 24 to adsorb the casing. After releasing the crossbar 22, the piston rod 221, under the action of air pressure, seals the valve port 211 with the first sealing edge 2211, maintaining the adsorption state. During disassembly, the crossbar 22 is pulled in the opposite direction so that the annular groove 2210 is aligned with the pressure relief chamber 230, and air enters the suction cup 24 to release the negative pressure.

[0027] In this embodiment, the suction cup assembly of the bracket forms a closed negative pressure air chamber. Utilizing the axial extension and retraction characteristics of the elastic telescopic tube 23, it absorbs multidimensional vibration energy, directly cutting off the hard transmission path between the volute 30 and the chassis. Compared to passive rubber pads, this structure actively dissipates high-frequency vibrations through the air cushion effect, effectively suppressing resonance. The elastic telescopic tube 23 has axial free travel (generally adjustable from 5-20mm), allowing the suction cup 24 to conform to chassis walls of different thicknesses / curvatures. During installation, only pressing the operation panel 21 triggers negative pressure adsorption, eliminating the need for customized hole matching, improving compatibility, and adapting to various fan models. The integrated pneumatic sealing structure avoids the risk of bolt loosening associated with split brackets; the piston rod 221 controls the valve port 211 to achieve "one-click adsorption / release," effectively improving disassembly and assembly efficiency, maintaining stable adsorption force under high-pressure conditions, and preventing structural failure.

Claims

1. A support assembly for a centrifugal fan casing, characterized in that: The device includes a support body (1) and a suction cup assembly connected to the support body (1). The support body (1) includes a first connecting base plate (11), which has a first side (111) facing the component to be installed and a second side (112) away from the component to be installed. The first connecting base plate (11) has a plurality of mounting channels (110) extending from its first side (111) to its second side (112). The suction cup assembly includes an operating plate (21), a piston rod (221), a suction cup (24), and an axially retractable elastic telescopic tube (23). The suction cup (24) is located on the side where the first side (111) of the first connecting base plate (11) is located. The operating plate (21) Located on the side of the second side (112) of the first connecting base plate (11), the operation plate (21) is provided with an operation hole (210), and a valve port (211) is formed on the inner wall of the operation hole (210). The elastic telescopic tube (23) is inserted into the mounting channel (110). The first end of the elastic telescopic tube (23) is connected to the suction cup (24) and communicates with the internal space of the suction cup (24). The second end of the elastic telescopic tube (23) is connected to the operation plate (21) and communicates with the corresponding operation hole (210) on the operation plate (21). The piston rod (221) is movably limited in the operation hole (210) and opens and closes the valve port (211).

2. The centrifugal fan casing support assembly according to claim 1, characterized in that: An annular groove (2210) is provided on the outer peripheral wall of the piston rod (221) near its free end. A first sealing flange (2211) and a second sealing flange (2212) are formed on the two opposite sides of the annular groove (2210). The second sealing flange (2212) can extend into the inner cavity of the elastic telescopic tube (23) and form a seal with the inner peripheral wall of the inner cavity of the elastic telescopic tube (23). The first sealing flange (2211) can abut against the outer peripheral edge of the valve port (211) to form a seal. The inner cavity of the elastic telescopic tube (23) is also provided with an outwardly recessed pressure relief chamber (230) at a position corresponding to the annular groove (2210) of the piston rod (221). The pressure relief chamber (230) is located outside the annular groove (2210).

3. The centrifugal fan volute support assembly according to claim 2, characterized in that: The piston rods (221) are arranged sequentially on the same straight line, and the outer ends of the piston rods (221) are connected by a crossbar (22) to form a single piece.

4. The centrifugal fan volute support assembly according to claim 2, characterized in that: The second side (112) of the first connecting base plate (11) is also provided with a mounting groove (113) that is recessed toward its first side (111). The shape of the operating plate (21) is adapted to the shape of the mounting groove (113). The operating plate (21) is movable and limited in the mounting groove (113) along the axial direction of the piston rod (221).

5. The centrifugal fan casing support assembly according to any one of claims 1 to 4, characterized in that: The elastic telescopic tube (23) is a silicone component.

6. The centrifugal fan casing support assembly according to any one of claims 1 to 4, characterized in that: The support body (1) further includes a second connecting substrate (12) connected to the first connecting substrate (11), and the second connecting substrate (12) is perpendicular to the first connecting substrate (11).

7. The centrifugal fan casing support assembly according to claim 6, characterized in that: The second connecting substrate (12) and the first connecting substrate (11) are provided with reinforcing ribs (13) at the connection position.

8. A centrifugal fan, comprising a volute (30) and a connecting bracket detachably connected to the side wall of the volute (30), characterized in that: The connecting bracket adopts the centrifugal fan casing bracket assembly described in any one of 1 to 7.

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