Omnidirectional damping double-air-inlet centrifugal fan

Abstract

The utility model relates to the technical field of fans, in particular to an omni-directional damping double-air-inlet centrifugal fan which solves the problems that a damping structure between a stator shaft and a support of an existing fan is complex, part machining difficulty is large and the like. The two ends, extending out of the outer rotor, of the stator shaft are fixed to the volute through supports at the air inlets in the two sides of the volute respectively, the impeller is fixed to the outer rotor, each support comprises three supporting arms which are distributed circumferentially and formed by steel plates, and clamping sections of the three supporting arms sequentially and fixedly define a clamping space for the stator shaft in a surrounding mode. A transition piece comprising a shaft sleeve and an elastic ring is arranged in the clamping space, the shaft sleeve is sleeved on the stator shaft in a rotation stopping manner, a non-circular inner ring of the elastic ring is sleeved on a non-circular outer ring of the shaft sleeve, and the three supporting arm clamping sections are sequentially and fixedly arranged in a surrounding manner and then circumferentially clamp the elastic ring in a rotation stopping manner; two side wings extending in the radial direction are formed on the clamping section of the supporting arm, and folding lugs folded between the two side wings and the inner and outer end faces of the shaft sleeve are integrally arranged on the elastic ring.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to an omnidirectional vibration-damping dual-inlet centrifugal fan. Background Technology

[0002] Centrifugal fans have relatively large air volume and air pressure, and long exhaust and supply distances. In a dual-inlet centrifugal fan, gas enters axially from both ends of the stator shaft into the centrifugal impeller driven by the outer rotor, and under the action of the centrifugal force of the impeller and the volute structure, the gas flows out radially. Both ends of the stator shaft are fixedly supported by brackets fixed to the air inlet of the volute.

[0003] The bracket at the air inlet is shaped like a Y-shaped three-pronged fork. The stator shaft is fixed to the core of the bracket, and the outer ends of the three forked arms of the bracket are fixed to the outer or inner wall of the volute. Existing brackets are either integral or split. The structure of the integral bracket is like the omnidirectional vibration-damping dual-inlet centrifugal fan disclosed in patent publication number CN119778288A. This fan has shortcomings in terms of vibration damping structure and bracket structure: First, the stator shaft is set on the mounting plate in a vibration damping manner, using an elastic structure similar to that on an elastic coupling. In order to achieve radial and axial vibration damping, radial vibration damping structures and axial vibration damping structures are set respectively. The integral structure has many parts, and the processing of multiple irregular parts is difficult, and the assembly is complicated. Second, the bracket has poor manufacturability. Different specifications of fans use brackets with different shapes and sizes, and the compatibility between production tooling of different brackets is poor, which is not conducive to small-batch production. Third, the centering accuracy and stability of the bracket are not good. The bracket is fixed through three fixing holes on the thin-walled volute. If the axis of the centrifugal impeller deviates from the axis of the volute, it will reduce the efficiency of the fan and increase the noise. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an omnidirectional shock-absorbing dual-inlet centrifugal fan with the same shock absorption effect, overcoming the problems of complex shock absorption structure between the stator shaft and the support of existing fans and the difficulty in processing parts.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an omnidirectional vibration damping dual-inlet centrifugal fan, which has a volute and an outer rotor motor and a centrifugal impeller inside the volute. The volute has air inlets on both sides. The two ends of the stator shaft extending from the outer rotor are fixed to the volute by brackets at the air inlets on both sides. The centrifugal impeller is fixed to the outer rotor. The bracket is a split bracket. The split bracket includes three identical support arms formed from steel plates that are evenly distributed around the circumference. The inner section of the support arm is a clamping section for supporting the stator shaft, and the outer section is a fixing section for fixing the bracket to the volute. The clamping section and the fixing section are connected by a connecting section.

[0006] The clamping section has a first connecting hole that is close to the fixed section and a second connecting hole that is far from the fixed section. In the clockwise direction or in the counterclockwise direction, any support arm is fixed with a stud at the first connecting hole and the second connecting hole of the next support arm. The clamping sections of the three support arms of the bracket are sequentially fixed to form a clamping space for the stator shaft.

[0007] The clamping space is provided with a transition component, which includes a bushing and an elastic ring. The bushing is circumferentially anti-rotationally fitted on the stator shaft, and the non-circular inner ring of the elastic ring is fitted on the non-circular outer ring of the bushing to prevent circumferential rotation of both. The three support arm clamping sections are sequentially fixed to surround the rear circumferentially anti-rotation clamping elastic ring.

[0008] The support arm clamping section is formed with radially extending side wings to prevent the transition piece from moving in both directions axially. The elastic ring is integrally provided with folded ears that fold towards the side wings and the inner and outer end faces of the bushing.

[0009] Specifically, the structure in which the three support arm clamping sections of the bracket are sequentially fixed and surrounded by a circumferential anti-rotation clamping elastic ring is such that the cross-sectional shape of the clamping space and the outer ring of the elastic ring are both non-circular, which can achieve circumferential anti-rotation of the elastic ring on the bracket.

[0010] Specifically, the structure of the bushing circumferentially anti-rotation type sleeve on the stator shaft is that the bushing is screwed with a fastening screw that presses against the outer circumferential surface of the stator shaft.

[0011] Specifically, the stator shaft is provided with a positioning step that rests on the inner end face of the bushing.

[0012] Specifically, in order to make the support axis, the air inlet axis and the motor axis as consistent as possible, improve the centering accuracy of the support for the stator shaft, and improve the stability of the support, the volute air inlet has a guide arc portion that facilitates airflow entry, and the fixed section is formed with a positioning arc portion, the concave arc surface of the positioning arc portion is attached to the convex arc surface of the guide arc portion.

[0013] Specifically, in order to reduce air intake resistance and improve the rigidity of the support, the connecting section of the steel plate forming support arm is a flat plate with reinforcing ribs, and the plane of the flat plate is parallel to the air intake direction.

[0014] The beneficial effects of this utility model are:

[0015] I. The omnidirectional shock-absorbing dual-inlet centrifugal fan of this utility model consists of three support arms of the same shape forming a clamping space for the stator shaft. Only a bushing and an elastic ring are set between the stator shaft and the support arms. The non-circular structure achieves anti-rotation and circumferential and radial shock absorption, and the folded lug on the elastic ring achieves axial shock absorption. The omnidirectional shock absorption structure is simple, with few parts and easy processing.

[0016] Second, a positioning arc is set on the bracket so that it fits against the air guide arc of the volute air inlet, making the bracket axis, air inlet axis and motor axis as consistent as possible, improving the fan accuracy. The fit of the arc surface improves the stability of the bracket, and the positioning arc of the bracket also has the effect of guiding the air.

[0017] Third, for brackets of different specifications, the clamping section and the fixing section can be formed using the same mold, and only the connecting section can be formed using a different mold to create reinforcing ribs. The bracket is easy to process and has low wind resistance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the front view of this utility model;

[0020] Figure 2 yes Figure 1 AA partial sectional view;

[0021] Figure 3 This is a left view of the present invention;

[0022] Figure 4 yes Figure 3 Enlarged view of point B;

[0023] Figure 5 This is an exploded view of the bracket and transition component in this utility model;

[0024] Figure 6 yes Figure 5 The C-direction view;

[0025] Figure 7 yes Figure 5 DD sectional view.

[0026] In the attached diagram: 1. Volute; 1-1. Guide arc;

[0027] 2. Centrifugal impeller;

[0028] 3. Stator shaft;

[0029] 4. Support arm; 4-1. Clamping section; 4-1-1. First connecting hole; 4-1-2. Second connecting hole; 4-1-3. Side wing; 4-2. Fixing section; 4-2-1. Positioning arc; 4-3. Connecting section; 4-3. Reinforcing rib.

[0030] 5. Transition parts; 5-1. Bushing; 5-2. Elastic ring; 5-2-1. Folding lug;

[0031] 6. Tighten the screws. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] As attached Figure 1 Main view and appendix Figure 3 The left view shows an omnidirectional vibration-damping dual-inlet centrifugal fan, comprising a volute 1 and an outer rotor motor and a centrifugal impeller 2 within the volute 1. The volute 1 has air inlets on both sides. The stator shaft 3, extending from the outer rotor, is fixed to the volute 1 at both ends via brackets at the air inlets. The centrifugal impeller 2 is fixed to the outer rotor. The brackets are split-type brackets. Figure 5 Exploded view of the stent and Figure 6 The C-direction view of the support arm 4 shows that the split bracket includes three identical support arms 4 formed from steel plates and evenly distributed around the circumference. The inner section of the support arm 4 is the clamping section 4-1 that supports the stator shaft 3, and the outer section is the fixing section 4-2 that fixes the bracket to the volute 1. The clamping section 4-1 and the fixing section 4-2 are connected by the connecting section 4-3.

[0034] The clamping section 4-1 has a first connecting hole 4-1-1 that is close to the fixed section 4-2 and a second connecting hole 4-1-2 that is far from the fixed section 4-2. In the clockwise direction, any support arm 4 is studded at the first connecting hole 4-1-1 and the second connecting hole 4-1-2 of the next support arm 4. The clamping sections 4-1 of the three support arms 4 of the bracket are sequentially fixed to form a clamping space for the stator shaft 3.

[0035] The clamping space is provided with a transition piece 5, which includes a bushing 5-1 and an elastic ring 5-2. The bushing 5-1 is circumferentially anti-rotation fitted onto the stator shaft 3, such as... Figure 4As shown, two fastening screws 6 are screwed onto the bushing 5-1, pressing against the outer circumferential surface of the stator shaft 3. A flat surface can be machined on the outer circumferential surface of the stator shaft 3 to facilitate the pressing and anti-rotation action of the fastening screws 6. The bushing 5-1 and the stator shaft 3 can also be connected by a key to achieve anti-rotation. The stator shaft 3 also has positioning steps that press against the inner end face of the bushing 5-1. The positioning steps at both ends of the stator shaft 3 press against the left and right bushings 5-1, thereby axially fixing the stator shaft 3. The non-circular inner ring of the elastic ring 5-2 is fitted onto the bushing. The non-circular outer ring of 5-1 prevents the elastic ring 5-2 and the bushing 5-1 from rotating circumferentially. The three support arms 4 clamping sections are sequentially fixed to clamp the elastic ring 5-2 in a circumferential anti-rotation manner. The cross-sectional shape of the clamping space and the outer ring of the elastic ring 5-2 are both non-circular to achieve the circumferential anti-rotation of the elastic ring 5-2 on the support. Alternatively, if the cross-sectional shape of the clamping space and the outer ring of the elastic ring 5-2 are both circular, then screws need to be installed on the support arms 4 to press against the elastic ring 5-2.

[0036] The support arm 4 clamping section 4-1 is formed with radially extending side wings 4-1-3 to prevent the transition piece 5 from moving axially in both directions, such as... Figure 5 and Figure 4 As shown, the elastic ring 5-2 is integrally provided with folded lugs 5-2-1 between the two side wings 4-1-3 and the inner and outer end faces of the bushing 5-1. The shape of the part before assembly of the elastic ring 5-2 is as follows. Figure 5 and Figure 7 As shown, the shape of the assembled elastic ring 5-2 is as follows: Figure 4 As shown, after assembly, the folded lug 5-2-1 of the elastic ring 5-2 bends relative to the body of the elastic ring 5-2.

[0037] like Figure 1 and Figure 2 The volute 1 has a guide arc 1-1 at the air inlet to facilitate airflow entry, and the fixed section 4-2 is formed with a positioning arc 4-2-1, the concave arc surface of the positioning arc 4-2-1 is attached to the convex arc surface of the guide arc 1-1.

[0038] The connecting section 4-3 of the steel plate forming support arm 4 is a flat plate with reinforcing ribs 4-3-1, and the plane direction of the flat plate is parallel to the airflow direction.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An omnidirectional vibration-damping dual-inlet centrifugal fan, comprising a volute (1) and an outer rotor motor and a centrifugal impeller (2) within the volute (1), wherein the volute (1) has air inlets on both sides, and the stator shaft (3) extending from the outer rotor is fixed to the volute (1) via supports at the air inlets on both sides, and the centrifugal impeller (2) is fixed on the outer rotor, characterized in that: The bracket is a split bracket, which includes three identical support arms (4) formed from steel plates and evenly distributed around the circumference. The inner section of the support arm (4) is a clamping section (4-1) that supports the stator shaft (3), and the outer section is a fixing section (4-2) that fixes the bracket to the volute (1). The clamping section (4-1) and the fixing section (4-2) are connected by a connecting section (4-3). The clamping section (4-1) has a first connecting hole (4-1-1) similar to the fixed section (4-2) and a second connecting hole (4-1-2) far from the fixed section (4-2). In the clockwise or counterclockwise direction, any support arm (4) is studded at the first connecting hole (4-1-1) and the second connecting hole (4-1-2) of the next support arm (4). The clamping sections (4-1) of the three support arms (4) of the bracket are sequentially fixed to form a clamping space for the stator shaft (3). The clamping space is provided with a transition piece (5), which includes a bushing (5-1) and an elastic ring (5-2). The bushing (5-1) is circumferentially anti-rotation fitted on the stator shaft (3), and the non-circular inner ring of the elastic ring (5-2) is fitted on the non-circular outer ring of the bushing (5-1) to prevent circumferential rotation of both. The clamping sections of the three support arms (4) are sequentially fixed to clamp the elastic ring (5-2) in a circumferentially anti-rotation manner. The support arm (4) clamping section (4-1) is formed with radially extending side wings (4-1-3) to prevent the transition piece (5) from moving in both directions axially. The elastic ring (5-2) is integrally provided with folded ears (5-2-1) between the side wings (4-1-3) and the inner and outer end faces of the bushing (5-1).

2. The omnidirectional vibration-damping dual-inlet centrifugal fan according to claim 1, characterized in that: The structure of the three support arms (4) of the bracket, which are sequentially fixed to the clamping section (4-1) and surround the circumferential anti-rotation clamping elastic ring (5-2), is such that the cross-sectional shape of the clamping space and the outer ring of the elastic ring (5-2) are both non-circular to achieve circumferential anti-rotation of the elastic ring (5-2) on the bracket.

3. The omnidirectional vibration-damping dual-inlet centrifugal fan according to claim 1, characterized in that: The structure of the bushing (5-1) being circumferentially anti-rotation sleeved on the stator shaft (3) is such that the bushing (5-1) is screwed with a fastening screw (6) that presses against the outer circumferential surface of the stator shaft (3).

4. The omnidirectional vibration-damping dual-inlet centrifugal fan according to claim 1, characterized in that: The stator shaft (3) is provided with a positioning step that rests on the inner end face of the bushing (5-1).

5. The omnidirectional vibration-damping dual-inlet centrifugal fan according to claim 1, characterized in that: The volute (1) has a guide arc (1-1) at the air inlet to facilitate airflow entry, and the fixed section (4-2) is formed with a positioning arc (4-2-1). The concave arc surface of the positioning arc (4-2-1) is attached to the convex arc surface of the guide arc (1-1).

6. The omnidirectional vibration-damping dual-inlet centrifugal fan according to claim 1, characterized in that: The connecting section (4-3) of the steel plate forming support arm (4) is a flat plate with reinforcing ribs (4-3-1) formed, and the plane direction of the flat plate is parallel to the airflow direction.

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