CN219282011U

CN219282011U - Spiral case formula centrifugal fan

Info

Publication number: CN219282011U
Application number: CN202320238478.2U
Authority: CN
Inventors: 梁炜亮; 叶涛; 覃万翔; 韦宏茂
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-06-30
Anticipated expiration: 2033-02-17

Abstract

The utility model discloses a volute type centrifugal fan, which comprises a volute and a centrifugal wind wheel, wherein the centrifugal wind wheel is rotatably arranged in the volute; the top of the centrifugal wind wheel is provided with a flow blocking ring in a protruding mode, the inner wall of the volute is provided with a mounting groove in an inward concave mode, and the mounting groove is used for accommodating the flow blocking ring; an operation gap is reserved between the mounting groove and the choke ring, and the distance between the inner groove wall of the mounting groove and the inner side wall of the choke ring is less than or equal to 2mm. The volute type centrifugal fan provided by the scheme can effectively reduce the loss of main air flow energy, so that the purpose of improving the fan efficiency is achieved, meanwhile, the whole air flow entering the centrifugal wind wheel can flow smoothly, the structure is simple and reasonable, the installation is convenient and quick, the cost is low, and the defects in the prior art are overcome.

Description

Spiral case formula centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a volute type centrifugal fan.

Background

Centrifugal fans are machines that increase the pressure of a gas by mechanical energy and then transport the gas out. The centrifugal fan in the prior art generally comprises a volute and a centrifugal wind wheel, and the operation principle is as follows: the centrifugal wind wheel is driven by the motor to rotate in the volute, does work on gas in the volute, changes the flow direction of the gas through the volute and increases the pressure of the gas, so that a pressure difference is formed between an air inlet and an air outlet of the volute, and the circulation of the gas is ensured.

In order to ensure smooth rotation of the centrifugal wind wheel inside the volute, a gap is generally formed between the centrifugal wind wheel and the volute in the conventional centrifugal fan. In the running process of the centrifugal fan, part of air flow entering the centrifugal wind wheel can enter the gap and then is converged into main air flow at the outlet of the centrifugal wind wheel, so that the energy loss of the main air flow is caused, and the efficiency of the centrifugal fan is reduced.

Disclosure of Invention

The utility model aims to provide a volute type centrifugal fan which can effectively reduce the loss of energy of main air flow, thereby achieving the purpose of improving the efficiency of the fan, and simultaneously enabling the air flow entering a centrifugal wind wheel to flow smoothly as a whole.

To achieve the purpose, the utility model adopts the following technical scheme:

the volute type centrifugal fan comprises a volute and a centrifugal wind wheel, wherein the centrifugal wind wheel is rotatably arranged in the volute;

the top of the centrifugal wind wheel is provided with a flow blocking ring in a protruding mode, the inner wall of the volute is provided with a mounting groove in an inward concave mode, and the mounting groove is used for accommodating the flow blocking ring; an operation gap is reserved between the mounting groove and the choke ring, and the distance between the inner groove wall of the mounting groove and the inner side wall of the choke ring is less than or equal to 2mm.

Preferably, the distance between the bottom of the mounting groove and the top of the choke ring is less than or equal to 2mm.

Preferably, the distance between the inner groove wall of the mounting groove and the inner side wall of the choke ring is more than 0.5mm, and the distance between the inner groove wall of the mounting groove and the inner side wall of the choke ring is less than 2mm.

Preferably, the distance between the bottom of the mounting groove and the top of the choke ring is more than 0.5mm, and the distance between the bottom of the mounting groove and the top of the choke ring is less than 2mm.

Preferably, the width of the choke ring is 0.5-3 mm.

Preferably, the height of the outer side wall of the choke ring is 1-3 mm.

Preferably, the centrifugal wind wheel comprises an air inlet guide ring, blades and a chassis which are sequentially arranged from top to bottom, the flow blocking ring is arranged at the top of the air inlet guide ring, and the flow blocking ring is positioned at the outer side edge of the air inlet guide ring.

Preferably, the number of the choke rings is at least one.

Preferably, the volute comprises an upper shell and a lower shell, and the mounting groove is formed in the upper shell;

the edge of the upper shell is provided with a buckle in a protruding mode, the edge of the lower shell is provided with a clamping block in a protruding mode, and the clamping block is detachably installed on the buckle.

Preferably, the shape of the choke ring is a closed circular ring.

The technical scheme provided by the embodiment of the application can comprise the following beneficial effects:

through arranging the convex choke ring at the top of the centrifugal wind wheel and arranging the concave mounting groove at the corresponding position of the volute, the air flow entering between the volute and the gap of the centrifugal wind wheel is blocked, so that the air flow is difficult to sink into the main air flow at the outlet of the centrifugal wind wheel, thereby effectively reducing the energy loss of the main air flow and achieving the purpose of improving the efficiency of the fan; meanwhile, the air flow entering the gap between the volute and the centrifugal wind wheel is reduced, so that the whole flow of the air flow entering the centrifugal wind wheel is smoother.

Drawings

Fig. 1 is a schematic structural view of a scroll type centrifugal fan according to the present utility model.

Fig. 2 is an exploded view of a scroll-type centrifugal fan according to the present utility model.

Fig. 3 is an exploded view of another view of a scroll-type centrifugal fan of the present utility model.

Fig. 4 is a partial structural sectional view of a scroll type centrifugal fan according to the present utility model.

Wherein: the volute casing 1, the upper casing 11, the mounting groove 111, the buckle 112, the lower casing 12 and the clamping block 121;

the centrifugal wind wheel 2, an air inlet guide ring 21, blades 22, a chassis 23 and a choke ring 211.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The technical scheme provides a volute type centrifugal fan, which comprises a volute 1 and a centrifugal wind wheel 2, wherein the centrifugal wind wheel 2 is rotatably arranged in the volute 1;

a choke ring 211 is arranged on the top of the centrifugal wind wheel 2 in a protruding mode, a mounting groove 111 is formed in the inner wall of the volute 1 in an inward recessed mode, and the mounting groove 111 is used for accommodating the choke ring 211; an operation gap is reserved between the mounting groove 111 and the choke ring 211, and the distance between the inner groove wall of the mounting groove 111 and the inner side wall of the choke ring 211 is less than or equal to 2mm.

Therefore, in order to solve the above technical problems, the present technical solution proposes a volute type centrifugal fan, as shown in fig. 1-4, including a volute 1 and a centrifugal wind wheel 2 rotatably installed inside the volute 1. Specifically, the top of the centrifugal wind wheel 2 is provided with a flow blocking ring 211 in a protruding manner, the inner wall of the volute 1 is provided with a mounting groove 111 for accommodating the flow blocking ring 211 in an inward concave manner, and through arranging the convex flow blocking ring 211 at the top of the centrifugal wind wheel 2 and arranging the concave mounting groove 111 at the corresponding position of the volute 1, the air flow entering a gap between the volute 1 and the centrifugal wind wheel 2 can be blocked, so that the air flow is difficult to be converged into the main air flow at the outlet of the centrifugal wind wheel 2, thereby effectively reducing the energy loss of the main air flow and achieving the purpose of improving the efficiency of a fan; meanwhile, the air flow entering the gap between the volute 1 and the centrifugal wind wheel 2 is reduced, so that the whole flow of the air flow entering the centrifugal wind wheel 2 is smoother.

Further, in order to avoid interference between the centrifugal wind wheel 2 and the volute casing 1 during high-speed rotation, an operation gap is left between the installation groove 111 and the choke ring 211 in the scheme, but the distance between the inner groove wall of the installation groove 111 and the inner side wall of the choke ring 211 in the operation gap is limited to be less than or equal to 2mm, as shown by a distance m in fig. 4, the choke effect of the choke ring 211 is effectively ensured.

Further, the distance between the bottom of the installation groove 111 and the top of the choke ring 211 is less than or equal to 2mm.

Still further, in order to further enhance the choke effect of the choke ring 211, it is still further preferable that the distance between the bottom of the installation groove 111 and the top of the choke ring 211 is defined to be 2mm or less, as shown by the distance n in fig. 4, to further enhance the operation efficiency of the centrifugal fan.

Further, the distance between the inner sidewall of the mounting groove 111 and the inner sidewall of the choke ring 211 is > 0.5mm, and the distance between the inner sidewall of the mounting groove 111 and the inner sidewall of the choke ring 211 is < 2mm.

To further illustrate, the distance between the bottom of the mounting groove 111 and the top of the choke ring 211 is > 0.5mm, and the distance between the bottom of the mounting groove 111 and the top of the choke ring 211 is < 2mm.

In order to achieve smooth running and flow blocking at the same time, the distance between the inner groove wall of the mounting groove 111 and the inner side wall of the flow blocking ring 211 in the running clearance and the distance between the groove bottom of the mounting groove 111 and the top of the flow blocking ring 211 are also optimized in the scheme.

Further, the width of the choke ring 211 is 0.5-3 mm.

Since the protruding choke ring 211 may have deformation risk when the centrifugal wind wheel 2 rotates at high speed, in order to prevent the occurrence of structural deformation of the choke ring 211, and considering the production cost and the structural weight of the centrifugal wind wheel 2, the width of the choke ring 211 is preferably 0.5-3 mm in this scheme, as shown by the distance d in fig. 4.

Further, the height of the outer sidewall of the choke ring 211 is 1-3 mm.

Furthermore, the height of the outer side wall of the choke ring 211 is preferably 1-3 mm, which is beneficial to ensuring that the air flow path between the volute 1 and the centrifugal wind wheel 2 is prolonged, thereby improving the air flow blocking effect of the choke ring 211.

Further, the centrifugal wind wheel 2 includes an air intake guide ring 21, blades 22 and a chassis 23 sequentially arranged from top to bottom, the choke ring 211 is disposed at the top of the air intake guide ring 21, and the choke ring 211 is disposed at the outer edge of the air intake guide ring 21.

In a preferred embodiment of the present disclosure, the choke ring 211 is disposed at the outer edge of the air intake guide ring 21, which is beneficial to enlarging the accommodating space of the mounting groove 111 and ensuring stable installation of the choke ring 211 inside the mounting groove 111.

Further, the number of choke rings 211 is at least one.

Further describing, the volute 1 includes an upper housing 11 and a lower housing 12, and the mounting groove 111 is formed in the upper housing 11;

the edge of the upper shell 11 is provided with a clamp 112 in a protruding mode, the edge of the lower shell 12 is provided with a clamp block 121 in a protruding mode, and the clamp block 121 is detachably installed on the clamp 112.

In another preferred embodiment of the present solution, the volute 1 comprises a removably mounted upper housing 11 and lower housing 12, which facilitates the installation and replacement of the centrifugal rotor 2 in order to extend the service life of the volute type centrifugal fan.

Further illustratively, the choke ring 211 is in the shape of a closed circular ring.

In a preferred embodiment of the present disclosure, the shape of the choke ring 211 is a closed ring, which is more beneficial to ensure the airflow blocking effect of the choke ring 211.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. The utility model provides a spiral case formula centrifugal fan which characterized in that: the centrifugal wind wheel is rotatably arranged in the volute;

2. A volute centrifugal fan according to claim 1, wherein: the distance between the bottom of the mounting groove and the top of the choke ring is less than or equal to 2mm.

3. A volute centrifugal fan according to claim 1, wherein: the distance between the inner groove wall of the mounting groove and the inner side wall of the choke ring is more than 0.5mm, and the distance between the inner groove wall of the mounting groove and the inner side wall of the choke ring is less than 2mm.

4. A volute centrifugal fan according to claim 2, wherein: the distance between the bottom of the mounting groove and the top of the choke ring is more than 0.5mm, and the distance between the bottom of the mounting groove and the top of the choke ring is less than 2mm.

5. A volute centrifugal fan according to claim 1, wherein: the width of the choke ring is 0.5-3 mm.

6. A volute centrifugal fan according to claim 1, wherein: the height of the outer side wall of the choke ring is 1-3 mm.

7. A volute centrifugal fan according to claim 1, wherein: the centrifugal wind wheel comprises an air inlet guide ring, blades and a chassis which are sequentially arranged from top to bottom, the flow blocking ring is arranged at the top of the air inlet guide ring, and the flow blocking ring is positioned at the outer side edge of the air inlet guide ring.

8. A scroll type centrifugal fan according to claim 1 or 7, wherein: the number of the choke rings is at least one.

9. A volute centrifugal fan according to claim 1, wherein: the volute comprises an upper shell and a lower shell, and the mounting groove is formed in the upper shell;

10. A volute centrifugal fan according to claim 1, wherein: the shape of the choke ring is a closed circular ring.