CN218522848U - Stable volute structure for centrifugal fan - Google Patents

Abstract

The utility model belongs to the technical field of fan equipment, concretely relates to stable spiral case structure that centrifugal fan used, include: the spiral case comprises a front spiral case body, a rear spiral case body, a spiral case lining plate, a spiral case baffle plate, a spiral case protecting plate, a spiral case lining plate, a spiral case baffle plate and a spiral case baffle plate, wherein the front spiral case body and the rear spiral case body are provided with arc-shaped spiral case protecting plates at the front side and the rear side; an air inlet is embedded in the volute protective plate on one side, the tail end of the air inlet is connected with a flow guide cavity, the tail end of the flow guide cavity is connected with an air outlet, and a centrifugal impeller is coaxially sleeved on the air inlet; the front end of the diversion cavity is coaxially provided with a choke hole with gradually-changed and contracted aperture, and the centrifugal impeller is electrically connected with an external speed regulating motor. The choke hole is additionally arranged to improve the flow velocity of the airflow, partial dynamic pressure of the airflow is released to be static pressure, and the rib plate divides the choke hole into a plurality of shunting cavities, so that the reinforcement is maintained stably and the shunting is balanced; the volute tongue is convenient for drawing out wind and guiding, and the sound absorption layer filters residual sound, so that the effects of improving the flow speed and eliminating noise of the stable volute structure for the centrifugal fan are comprehensively realized.

Description

Stable volute structure for centrifugal fan

Technical Field

The utility model belongs to the technical field of fan equipment, concretely relates to stable spiral case structure that centrifugal fan used.

Background

The centrifugal fan is a fluid machine which can input energy, improve gas pressure and exhaust gas, and is widely applied to cooling and ventilation of industrial and mining, tunnels, transportation, buildings and air-conditioning household appliances due to the characteristics of large suction force, low noise and compact structure.

The centrifugal fan comprises a volute and a centrifugal fan, air inlets are formed in two single-side sides of the volute, an air outlet is formed in the tangential direction of the volute, the centrifugal fan drives a centrifugal impeller and fluid to rotate to generate centrifugal force, the fluid obtains kinetic energy along a blade flow channel and enters the volute at high speed, the fluid is decelerated due to the gradual width of the flow channel, part of the kinetic energy is converted into static pressure energy, and higher pressure flows to the air outlet.

The volute is a volute type drainage chamber for short, the section of the volute is gradually reduced to ensure uniform discharge to the guide mechanism, meanwhile, necessary flow is formed in advance before flowing to reduce the guide strength, and the proper size is maintained to avoid too fast energy attenuation; the structural type of the metal volute is more closely related to the size of a matched device interface. The section of the volute diversion cavity is nearly circular, the thickness of the steel plate is correspondingly set according to different stress of the volute section, and the thickness of the volute air inlet section is generally larger and smaller when the volute air inlet section is closer to the nose; the stress of the metal volute is related to the local stress caused by different thicknesses and different intensities at the joint of the base of the volute and the longitudinal section of the volute besides the thin-wall stress caused by the internal pressure.

The air flows through the volute, the center line is bent to generate centrifugal force in the bent flow channel, so that pressure difference is generated between the inner edge and the outer edge of the volute, the pressure difference depends on the air flow speed and the profile mutation condition of the cross section, the average flow speed is in direct proportion to the flow passing through the cross section, and the differential pressure value between the inner edge and the outer edge of the volute reflects the relative flow value of the fan.

In order to reduce or eliminate the pressure fluctuation, effective pressure stabilization measures are that symmetrical linear damping such as throttling pressure stabilization equipment and the like are added on the basis of a pressure transmission system; the flow velocity is accelerated, and the possibility that the air flow characteristic is changed from laminar flow to turbulent flow is finally aggravated, the turbulent flow is an important expression of the turbulent flow state of fluid turbulence, so that the flow velocity of the air flow is intentionally improved in the positive direction, and meanwhile, active measures are taken to avoid and reduce the concomitant phenomenon of the turbulent flow.

Chinese patent with current publication number CN214887930U discloses an evaporation fan, including spiral case front bezel, spiral case air duct board, spiral case back plate, outlet flue connecting plate and outlet flue, the spiral case front bezel is provided with into the mouth of cigarette, and the board encloses into the outlet flue behind spiral case front bezel, spiral case air duct board, the spiral case, and outlet flue connecting plate and outlet flue are located outlet flue top, its characterized in that: the volute air duct plate comprises a volute front plate, a volute rear plate and a volute air duct plate extending part, wherein the volute front plate is provided with a plurality of volute air duct plate extending parts, the volute front plate is provided with a volute front plate elongated hole matched with the volute air duct plate extending part, the volute rear plate is provided with a volute rear plate elongated hole matched with the volute air duct plate extending part, the volute air duct plate extending part penetrates through the volute front plate elongated hole to be bent and fastened, and the volute air duct plate extending part penetrates through the volute rear plate elongated hole to be bent and fastened. The utility model discloses a through overcoming welding defect, thereby effectively overcome the oil smoke and corrode and age invasion and attack increase of service life, simple structure to reduce tooling die's cost of manufacture.

The above prior art solutions have the following drawbacks: although the problem of welding defects is solved by additionally arranging the volute air duct plate and the rear plate, the stable volute structure for the centrifugal fan is still lacked, so that the problems of improving the air blowing flow speed and reducing the air blowing noise are fundamentally solved structurally.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a stable spiral case structure that centrifugal fan used satisfies the demand that improves the blast air velocity of flow and reduce the blast air noise to effectively guarantee the safety and stability and the reliable perfect of stable spiral case structure that centrifugal fan used.

In order to solve the technical problem, the utility model provides a centrifugal fan is with stabilizing spiral case structure, include: the volute casing protection plates on the front side and the rear side are symmetrical, a volute casing lining plate is connected between the inner outlines of the volute casing protection plates, a volute casing baffle plate is connected between the outer outlines of the volute casing protection plates, a flow guide cavity is defined by the volute casing protection plates, the volute casing lining plate and the volute casing baffle plate, and an air inlet is embedded in one side of the volute casing protection plate; the air inlet end-to-end connection the water conservancy diversion chamber, water conservancy diversion chamber end-to-end connection has the air outlet, the coaxial cover of air inlet is equipped with centrifugal impeller, centrifugal impeller turn to with the water conservancy diversion chamber moves towards corresponding the setting, the coaxial choke hole that shrinks that is equipped with the aperture gradual change of water conservancy diversion chamber front end, the electric connection of centrifugal impeller peripheral hardware adjustable speed motor.

Furthermore, a speed-increasing and noise-reducing choke device is formed for a stable volute structure for the propulsion centrifugal fan, a plurality of rib plates are arranged in the choke hole, and the plurality of rib plates equally divide the choke hole into a plurality of symmetrically distributed shunting cavities.

Further, for the stable spiral case structure internal choking device for centrifugal fan has good effect setting, the trend of the diversion cavity is formed with a connection arc, and the starting end of the choking hole is arranged at the curvature distortion position of the connection arc.

Further, strengthen the reasonable structure setting of air intake for the stable spiral case structure that causes centrifugal fan to use, centrifugal impeller include the collector with the coaxial guard shield that inlays in the collector, the coaxial streamlined blade around being equipped with a plurality of equipartitions in guard shield center, the guard shield periphery evenly surrounds and is equipped with a plurality of grid poles.

Furthermore, a surface mechanism for noise reduction is constructed for a stable volute structure for pushing the centrifugal fan, and a plurality of micro counter bores for noise reduction are densely arranged on the side wall of the volute liner plate.

Furthermore, for achieving the process flow of pollution removal and noise reduction of the stable volute structure for the centrifugal fan, a filter screen is arranged on the outer side of the air inlet, and smooth arcs are arranged on the inner edges of the air inlet and the current collector.

Furthermore, the centrifugal fan has important supplement of speed increasing and noise reduction for adjusting a stable volute structure for the centrifugal fan, a volute tongue for drawing wind and conducting flow is arranged at the bottom end of the air outlet, and a sound absorption layer is arranged on the inner wall of the volute lining plate.

Furthermore, in order to promote the stable volute structure for the centrifugal fan to improve the strength and weaken the noise, reinforcing sleeves used for reinforcing and reducing noise are sleeved on the inner peripheries of the air inlet and the air outlet.

Furthermore, in order to create a solution that the stable volute structure for the centrifugal fan has flexible, convenient and standby treatment, the volute lining plate, the volute baffle, the choke hole and the shunt cavity are arranged into split or integrated structures.

The beneficial effects of the utility model are that:

1. the centrifugal impeller is embedded with a current collector, so that the airflow at the air inlet can smoothly and efficiently enter the centrifugal impeller, the streamline blades can apply work to the air and improve the kinetic energy of the airflow, and the grating rod is enclosed into a shield to play a role in safety protection; the volute casing guard plate, the volute casing lining plate and the volute casing baffle plate are enclosed to form an effective flow guide cavity, so that the volute casing is favorable for concentrating the air flow entering the centrifugal impeller, guiding the air flow gradually and extending the air flow to the air outlet, and converting partial dynamic pressure into static pressure; the volute diversion cavity generally follows the trend of a regular curve and gradually changes from a narrow part to a wide part, the kinetic energy, potential energy and pressure intensity of fluid in a closed area are kept in a conservation law according to the Bernoulli equation, the space is enlarged, the energy loss causes the reduction of flow velocity, a diversion cavity which is connected with the arc curvature direction and has distortion is selected to be additionally provided with a choke hole, the flow velocity of air flow is obviously improved, partial dynamic pressure of the air flow is effectively released to be static pressure, and higher pressure is formed to flow to an air outlet; the rib plates divide the choke holes into symmetrical shunting cavities uniformly, so that not only can the stability be enhanced and maintained, but also the active balanced shunting is promoted to avoid and reduce the turbulence phenomenon; the volute liner plate side wall is suggested to be integrally cast or forged with a micro counter bore with variable diameter and different depth, a resistive resonance-resistant silencer is formed by a multi-cavity structure of the counter bore, and the adjustable arrangement of the bore depth and the bore diameter changes the frequency spectrum performance, so that the silencing, noise-reducing and noise-removing effects are influenced, and the requirements of improving the flow rate and reducing the noise of a stable volute structure for the centrifugal fan are further met.

2. Dirt is removed and impurities are filtered by additionally arranging a filter screen, smooth arc noise elimination and noise reduction are realized, and the phenomenon of hoarseness and squeal possibly caused by windward large areas is avoided; the volute tongue is additionally arranged in front of the air outlet to facilitate wind-pulling and drainage, so that the rapid gathering and gathering of airflow is accelerated; the reinforcement sleeve is used for strengthening, maintaining, stabilizing, silencing and noise reducing, and the sound absorption layer filters residual sound; the function of making an uproar is fallen to the acceleration when volute welt, volute baffle, choke hole and reposition of redundant personnel chamber establish to components of a whole that can function independently structure and more stable outstanding, sets up to well the integrated structure of adorning and reduces the manufacturing degree of difficulty for the advantage of production progress, the stable volute structure safe and reliable and stable lasting effect that further realization centrifugal fan used.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic elevation view of a stabilized volute structure for a centrifugal fan according to the present invention;

FIG. 2 is a cross-sectional view of a choke hole in a stabilized volute structure for a centrifugal fan according to the present invention;

fig. 3 is an enlarged view at a in fig. 2.

In the figure:

1. a volute casing guard plate; 2. a volute liner plate; 3. a volute baffle; 4. a flow guide cavity; 5. an air inlet; 6. an air outlet; 7. a centrifugal impeller; 8. a choke hole; 9. a rib plate; 10. a shunting cavity; 11. a connecting arc; 12. a current collector; 13. a shield; 14. a streamlined blade; 15. a grid rod; 16. micro counter bores; 17. filtering with a screen; 18. Smoothing the arc; 19. a volute tongue; 20. a sound absorbing layer; 21. and (5) reinforcing the sleeve.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention are described clearly and completely below with reference to the accompanying drawings. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to fig. 3, the utility model discloses a stable spiral case structure for centrifugal fan, include: the spiral case comprises arc spiral case guard plates 1 arranged on the front side and the rear side, the spiral case guard plates 1 on the front side and the rear side are symmetrical to each other, spiral case lining plates 2 are connected between the inner outlines of the spiral case guard plates 1, spiral case baffles 3 are connected between the outer outlines of the spiral case guard plates 1, and flow guide cavities 4 are enclosed by the spiral case guard plates 1, the spiral case lining plates 2 and the spiral case baffles 3; an air inlet 5 is embedded in the volute casing guard plate 1 on one side, the tail end of the air inlet 5 is connected with a flow guide cavity 4, and the tail end of the flow guide cavity 4 is connected with an air outlet 6; the air inlet 5 is coaxially sleeved with a centrifugal impeller 7, the direction of the centrifugal impeller 7 is correspondingly set with the direction of the flow guide cavity 4, the front end of the flow guide cavity 4 is coaxially provided with a choke hole 8 with gradually-changed and contracted aperture, and the centrifugal impeller 7 is electrically connected with an external speed regulating motor. A plurality of ribbed plates 9 are arranged in each throttling hole 8, and the plurality of ribbed plates 9 equally divide the throttling hole 8 into a plurality of flow dividing cavities 10 which are symmetrically distributed. The trend of the diversion cavity 4 forms a connecting arc 11, and the starting end of the choking hole 8 is arranged at the curvature distortion position of the connecting arc 11. The centrifugal impeller 7 comprises a current collector 12 and a protective cover 13 coaxially embedded in the current collector 12, a plurality of uniformly distributed streamline blades 14 are coaxially wound in the center of the protective cover 13, and a plurality of grid rods 15 are uniformly arranged on the periphery of the protective cover 13 in a surrounding mode.

The side wall of the volute liner plate 2 is densely provided with a plurality of micro counter bores 16 for noise reduction.

Obviously, in the present embodiment, a current collector 12 is additionally arranged in the centrifugal impeller 7 to attract air flow to smoothly and efficiently enter the centrifugal impeller 7 from the air inlet 5, the streamline blades 14 apply work to the air and improve the kinetic energy of the air flow, and the grille rod 15 encloses the shield 13 for safety protection; the volute casing guard plate 1, the volute casing lining plate 2 and the volute casing baffle plate 3 are divided into effective flow guide cavities 4, airflow of the centrifugal impeller 7 is concentrated and gradually guided to extend to the air outlet 6, and partial dynamic pressure is converted into static pressure; the curvature distortion of the connecting arc 11 is positioned in front of the air outlet 5, a choke hole 8 is additionally arranged on the necessary path to increase the flow velocity of the airflow, partial dynamic pressure of the airflow is converted into static pressure, and the high-pressure airflow rushes to the air outlet; the rib plates 9 are used for symmetrically dividing the choke hole 8 into the diversion cavities 10, and the division into 4 equal parts is recommended but not limited, so that the stability and the stability are enhanced, and active balanced diversion is promoted to avoid turbulence; the proposal is that but not limited to the integral casting or forging of the uniform distribution of the variable-diameter different-depth micro-counter bore 16 in the volute liner plate 2, a resistive anti-resonance silencer is formed by a counter bore multi-cavity structure, the depth and the aperture of the counter bore are adjusted to change the frequency spectrum to influence the silencing effect, and the purposes of improving the flow rate and reducing the noise of the stable volute structure for the centrifugal fan are realized.

As shown in fig. 1 to 3, a filter screen 17 is disposed outside the air inlet 5, and a smooth arc 18 is disposed along the inner edge of each of the air inlet 5 and the collector 12. The bottom end of the air outlet 6 is provided with a volute tongue 19 for drawing wind and guiding flow, and the inner wall of the volute liner plate 2 is provided with a sound absorption layer 20. The inner circumferences of the air inlet 5 and the air outlet 6 are respectively sleeved with a reinforcing sleeve 21 for reinforcing and reducing noise.

The volute liner plate 2, the volute baffle plate 3, the choke hole 8 and the flow dividing cavity 10 are arranged in a split structure.

More specifically, in the embodiment, the filter screen 17 removes dirt and impurities, the smooth arc 18 eliminates noise, and avoids windward resonance or the phenomenon of hoarseness and squeal; the volute tongue 19 draws wind and conducts drainage; the reinforcing sleeve 21 reinforces and reduces noise, the sound absorbing layer 20 filters residual sound, and the split structure enhances the speed-increasing and noise-reducing functions, so that the aims of safety, reliability, stability and durability of the stable volute structure for the centrifugal fan are comprehensively fulfilled.

Example two

As shown in fig. 1 to 3, the present invention is different from the first embodiment in that the volute casing lining plate 2, the volute baffle plate 3, the choke hole 8 and the diversion cavity 10 may be configured as an integrated structure.

It is emphasized that, in this embodiment, the volute liner plate 2, the volute baffle plate 3, the choke hole 8 and the flow dividing cavity 10 are integrated in a split-die involution casting or forging manner, so that the manufacturing difficulty is reduced, the production progress is accelerated, and the effect of safety, reliability, stability and durability of the stable volute structure for the centrifugal fan is flexibly realized.

In summary, the centrifugal impeller 7 with the stable volute structure for the centrifugal fan of the present invention sucks the air flow to form air pressure, the current collector 12 promotes the air flow to smoothly and efficiently enter the centrifugal impeller 7, the streamline blades 14 continuously apply work to the air and improve the kinetic energy of the air flow, and the protective cover 13 can safely protect the air flow; the flow guide cavity is beneficial to guiding the air flow of the centrifugal impeller 7 to flow to the air outlet 6 in a centralized manner; a choke hole 8 is additionally arranged to increase the flow velocity of the airflow and release partial dynamic pressure of the airflow as static pressure; the choke hole 8 is divided into a plurality of shunting cavities 10 by the rib plates 9, so that the reinforcement, the maintenance and the stable balanced shunting are realized to avoid turbulence; the micro counter bore 16 with the variable diameter and different depth adjustment function is a resistive anti-resonance silencer, the filter screen 17 can remove dirt and filter impurities, the volute tongue 19 can be used for drawing wind and conducting flow, the reinforcing sleeve 21 is used for reinforcing, stabilizing, silencing and noise reducing, the sound absorbing layer 20 is used for filtering remaining sound, the split structure is favorable for reinforcing speed acceleration and noise reduction, the split and opposite-mounting integrated structure is favorable for reducing the process difficulty and improving the production efficiency, and the effects of improving the flow speed and eliminating the noise of the stable volute structure for the centrifugal fan are further achieved.

In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or relationships based on the orientations or relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (9)

1. A stable volute structure for a centrifugal fan is characterized by comprising a volute body; the spiral case comprises spiral case protection plates (1) which are arc-shaped and arranged on the front side and the rear side, wherein the spiral case protection plates (1) on the front side and the rear side are symmetrical, a spiral case lining plate (2) is connected between the inner outlines of the spiral case protection plates (1), and a spiral case baffle plate (3) is connected between the outer outlines of the spiral case protection plates (1);

a flow guide cavity (4) is surrounded by the volute guard plate (1), the volute liner plate (2) and the volute baffle plate (3);

an air inlet (5) is embedded in the volute casing protection plate (1) on one side;

the tail end of the air inlet (5) is connected with the flow guide cavity (4);

the tail end of the flow guide cavity (4) is connected with an air outlet (6);

the air inlet (5) is coaxially sleeved with a centrifugal impeller (7);

the centrifugal impeller (7) turns to and the flow guide cavity (4) moves towards and is correspondingly arranged:

a choke hole (8) with gradually-changed and contracted aperture is coaxially arranged at the front end of the flow guide cavity (4);

the centrifugal impeller (7) is electrically connected with an external speed regulating motor.

2. The stabilizing volute structure for centrifugal blowers according to claim 1, wherein the chokes (8) each have ribs (9) therein;

the throttling hole (8) is equally divided into a plurality of symmetrically distributed shunting cavities (10) by a plurality of rib plates (9).

3. The stabilized volute structure for centrifugal fans according to claim 1, wherein the baffle chamber (4) is shaped with a connecting arc (11);

the starting end of the choke hole (8) is arranged at the curvature distortion of the connecting arc (11).

4. The stabilized volute structure for centrifugal fans according to claim 1, wherein the centrifugal impeller (7) comprises a collector (12) and a shroud (13) coaxially embedded in the collector (12);

a plurality of uniformly distributed streamline blades (14) are coaxially wound at the center of the shield (13);

and a plurality of grid rods (15) are uniformly arranged on the periphery of the shield (13).

5. The stable volute structure for centrifugal fans according to claim 1, wherein the side wall of the volute liner plate (2) is densely provided with a plurality of micro-counter bores (16) for noise reduction and noise reduction.

6. The stabilizing volute structure for centrifugal blowers according to claim 4, wherein a filter screen (17) is provided outside the inlet (5);

and both the air inlet (5) and the current collector (12) are provided with smooth arcs (18) at the inner edges.

7. The stable volute structure for centrifugal fans according to claim 1, wherein the bottom end of the air outlet (6) is provided with a volute tongue (19) for draught diversion;

and a sound absorption layer (20) is arranged on the inner wall of the volute casing lining plate (2).

8. The stable volute structure for centrifugal blower according to claim 1, wherein the inner peripheries of the inlet (5) and the outlet (6) are provided with a reinforcing sleeve (21) for reinforcing and reducing noise.

9. The stabilized volute structure for centrifugal fans according to claim 2, wherein the volute liner (2), the volute baffle (3), the choke hole (8) and the diverging chamber (10) are provided as a separate or integrated structure.

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