CN215486701U

CN215486701U - Fan impeller with unloading angle

Info

Publication number: CN215486701U
Application number: CN202121155092.2U
Authority: CN
Inventors: 郑泳良
Original assignee: Shanghai Erhuajie Electromechanical Equipment Manufacturing Co ltd
Current assignee: Shanghai Erhuajie Electromechanical Equipment Manufacturing Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-01-11
Anticipated expiration: 2031-05-26

Abstract

The application relates to a fan impeller with an unloading angle, which comprises a hub fixed on a fan impeller shaft and blades uniformly fixed on the hub, wherein the included angle between a blade handle of each blade and the vertical plane of the axis of the hub is alpha, and the numerical range of the alpha is 1-5 degrees; the hub comprises a shaft sleeve and a fixing piece, the fixing piece is evenly fixed on the shaft sleeve, and the blades are fixed at the outer end of the fixing piece. This application has the reliability of reinforcing impeller, and reduction in production cost simultaneously to the wheel hub and the petiole design of equivalent strength, fan wheel in this application can bear bigger wind pressure, adapts to the cooling tower of higher requirement.

Description

Fan impeller with unloading angle

Technical Field

The application relates to a fan impeller of a cooling tower in the petrochemical industry, in particular to a fan impeller with an unloading angle.

Background

The cooling tower fan is generally composed of an impeller, a speed reducer, a transmission shaft, an oil system, a motor and other parts, wherein the impeller is driven by power to rotate, air is sucked from the lower part of the impeller and is vertically blown upwards through the impeller to flow through an air duct as a cooling medium, so that the air duct medium is cooled. The impeller is a group of parts which are particularly critical in the system and is assembled by a set of hub assembly and a set of blades, and the design of the impeller relates to the operation life, the cooling effect and the like.

In the petrochemical industry, the working environment of the cooling tower is severe, and the requirement on the performance of the fan is high, so that the fan impeller is expected to be more reliable and have longer service life. The blade of impeller passes through fixing device in the trade and fixes the petiole position on the bottom plate, the plane that the axle center of a set of blade is located the horizontal plane, and is perpendicular with the rotation center, the blade has received perpendicular decurrent self gravity, wind pressure and horizontal direction centrifugal force and fixing device to its frictional force and the pressure effect in the vertical direction in the operation process, the power of vertical direction produces very big moment of flexure to blade fixing device and petiole department, it is very high to fixing device and petiole intensity requirement, the intensity is not enough can cause accidents such as fixing bolt fracture, petiole fracture, traditional impeller intensity that does not have the uninstallation angle is limited, the reliability is low, if need to improve intensity can increase a large amount of manufacturing cost.

Therefore, the fan impeller with the unloading angle is required to be designed, the included angle is designed between the axis of the blade and the horizontal plane after the impeller is installed, in the operation process, the centrifugal force of the blade has an upward component force in the vertical direction, and can offset a part of vertical downward force, so that the requirements on the strength of the fixing device and the blade handle are greatly reduced, the cost is reduced, the occurrence of accidents is reduced, and the reliability of the impeller and the service life of the fan are enhanced.

SUMMERY OF THE UTILITY MODEL

In order to solve not enough among the prior art, improve fan wheel's reliability, reduce the cost of fan, this application provides a fan wheel at area uninstallation angle.

The application provides a take fan wheel at uninstallation angle adopts following technical scheme:

a fan impeller with an unloading angle comprises a hub fixed on a fan impeller shaft and blades uniformly fixed on the hub, wherein the included angle between a blade handle of each blade and the vertical plane of the axis of the hub is alpha, and the numerical range of the alpha is 1-5 degrees.

By adopting the technical scheme, after the blades are installed, the plane where the blades and the hub are located forms an alpha included angle, a part of vertical downward force can be unloaded by the blades in the operation process, the bending moment born by the hub and the blade handles is reduced, the stability of the hub and the blade handles is improved, the operation of the impeller is more reliable, the design strength of the hub and the blade handles can be properly reduced, and the product cost is reduced.

Preferably, the hub comprises a shaft sleeve and fixing pieces, the fixing pieces are arranged in one-to-one correspondence with the blades, the fixing pieces are uniformly fixed on the shaft sleeve, and the blades are fixed at the outer ends of the fixing pieces.

By adopting the technical scheme, the blades can be conveniently fixed on the hub, and the weight of the hub is reduced to a certain extent.

Preferably, the fixing part comprises two bottom plates and N groups of mounting plates, the two mounting plates are of a group structure, each group of mounting plates corresponds to one blade, the two bottom plates are fixed on two sides of the shaft sleeve, the two mounting plates in each group are respectively mounted on opposite sides of the two bottom plates, an arc concave surface is formed in the opposite side of each group of mounting plates, and the arc concave surfaces are matched with the blade handles of the blades.

Through adopting above-mentioned technical scheme, the circular arc concave surface on the mounting panel and the petiole looks adaptation of blade accomplish the stable fixed to the blade.

Preferably, the bottom plate is detachably and fixedly connected with the shaft sleeve through a first bolt assembly.

Through adopting above-mentioned technical scheme, the bottom plate of being convenient for is installed on the axle sleeve.

Preferably, the outer side of the shaft sleeve is provided with a positioning groove matched with the bottom plate, and the outer end face of the bottom plate and the end face of the shaft sleeve are arranged in a coplanar manner.

Through adopting above-mentioned technical scheme, fix a position the bottom plate for the installation effectiveness of bottom plate can subtract heavy to the axle sleeve simultaneously.

Preferably, the mounting plate is detachably and fixedly connected with the bottom plate through a second bolt assembly

Through adopting above-mentioned technical scheme, realize the installation board in the installation of the blade of being convenient for in the dismantled fixed connection of bottom plate.

Preferably, the mounting plate is of a block structure formed by die-casting an aluminum alloy material.

Through adopting above-mentioned technical scheme, the mounting panel that the aluminum alloy was made, its density is lower, when guaranteeing structural strength, alleviates the quality of mounting panel.

Preferably, the included angle α between the blade handle of the blade and the vertical plane of the hub axis is 3 °.

By adopting the technical scheme, the bending moment borne by the hub and the blade handle is reduced to the maximum extent.

In summary, the present application includes at least one of the following beneficial technical effects:

this application forms alpha contained angle through blade and wheel hub place plane, makes the blade installation back can unload partly vertical decurrent power in the operation process, has reduced the moment of flexure that wheel hub and petiole bore to improve the stability of wheel hub and petiole, the impeller operation is more reliable, and the design strength of wheel hub and blade petiole can suitably reduce, thereby has reduced product cost. Compared with the traditional fan impeller without an unloading angle, the fan impeller can bear larger wind pressure in the design of the hub and the petiole with the same strength, and provides the impeller with higher performance to adapt to a cooling tower with higher requirements.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a mounting plate in an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a mounting plate in an embodiment of the present application;

fig. 4 is a schematic structural diagram of an embodiment of the present application.

Description of reference numerals: 1. a shaft sleeve; 2. a base plate; 3. mounting a plate; 4. a blade; 5. a first bolt assembly; 6. a second bolt assembly.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

For the field of petrochemical industry, the working environment of a cooling tower is severe, and the requirement on the performance of a fan is high, so that the fan impeller is expected to be more reliable and have longer service life. The blade of the traditional fan impeller is fixed on a hub through a fixing device, and the plane of the axis of the installed blade group is positioned on the horizontal plane and is vertical to the rotation center. The conventional impeller without the unloading angle has limited strength and low reliability, and the requirement of improving the strength can increase a large amount of production cost.

The embodiment of the application discloses a fan impeller with an unloading angle, which is used for the petrochemical industry.

As shown in fig. 1 and 2, the fan impeller with the unloading angle comprises a hub and blades 4, wherein the hub is arranged on a fan impeller shaft, the blades 4 are arranged on the side surface of the hub, the blades 4 are uniformly distributed on the side surface of the hub, and the included angle between the blade handle axis of each blade 4 and the vertical plane of the hub axis is alpha, generally, alpha is more than 1 degree and less than 5 degrees.

In this embodiment, α is 3 °, that is, the axis of the blade 4 forms a conical surface, the included angle between the generatrix of the conical surface and the horizontal plane is 3 °, and the fan impeller with the unloading angle is formed, so that the bending moment borne by the blade 4 and the bending moment applied to the fixed structure can be reduced to the maximum extent, thereby increasing the stability and reliability of the impeller, and reducing the production cost to a certain extent.

As shown in fig. 1, the hub includes a shaft sleeve 1 and a fixing member, the shaft sleeve 1 is mounted on the fan impeller shaft, the fixing member is mounted on the periphery side of the shaft sleeve 1, the blades 4 are mounted on the fixing member, and the connection between the blades 4 and the shaft sleeve 1 is realized through the fixing member. In the present embodiment, the fixing members are uniformly fixed to the side of the shaft sleeve 1, so that the vanes 4 are uniformly distributed on the shaft sleeve 1.

In the present application, as shown in fig. 4, the number of the blades 4 is not limited, and may be an even number or an odd number. In fig. 1, six blades 4 are provided, and this embodiment will be explained.

As shown in fig. 1, a plurality of fixing elements are uniformly distributed on the circumferential side of the shaft sleeve 1, and the structure is the same, and the structural features of any one fixing element are selected for explanation.

The mounting all includes two bottom plates 2 and N group's mounting panel 3, and N's quantity is six.

Two bottom plates 2 are fixed on the two opposite sides of the same position of the shaft sleeve 1, specifically, the bottom plates 2 are detachably and fixedly connected with the shaft sleeve 1 through the first bolt assemblies 5, each first bolt assembly 5 comprises a first bolt and a first nut, the first bolt penetrates through the bottom plates 2 and the shaft sleeve 1 and is fixed with the first nut in a threaded mode, and the bottom plates 2 and the shaft sleeve 1 are fixed after the first bolt assemblies 5 are locked.

In the present embodiment, in order to realize stable fixation of the base plate 2 and the boss 1, the number of the first bolt assemblies 5 is six.

The installation efficiency of the upper bottom plate 2 and the shaft sleeve 1 is lower, in order to improve the installation efficiency of the bottom plate 2 and the shaft sleeve 1, positioning grooves corresponding to the bottom plate 2 are uniformly formed in the peripheral sides of the shaft sleeve 1, installation hole positions of the first bolt assemblies 5 are formed in the positioning grooves, and after the bottom plate 2 is installed on the surface of the shaft sleeve 1, one outer side surface of the bottom plate 2 is coplanar with the end surface of the shaft sleeve 1.

In addition, the thickness of the bushing 1 is thick, which is inconvenient for a drilling machine to drill holes on the bushing 1. In order to facilitate the opening of the mounting hole positions, the outer side surface of the shaft sleeve 1 is provided with an avoiding groove, and meanwhile, the shaft sleeve 1 can be lightened.

As shown in fig. 1 and 3, two mounting plates 3 in each group are mounted on opposite surfaces of two base plates 2, and arc grooves are formed in opposite sides of the two mounting plates 3, the radius of each arc groove is the same as that of the blade shanks of the blades 4, and then the arc concave surfaces are matched with the blade shanks of the blades 4, so that the blades 4 can be stably fixed.

In this embodiment, the mounting plate 3 can be formed integrally with the bottom plate 2, and the fixing member of an integral stainless steel structure is heavy, and although the fixing member can stably fix the blade handles of the blades 4, under the same condition, compared with a traditional fan impeller, the cost is reduced to a certain extent, and overall, the cost is still to be reduced.

If the cost is further reduced, the mounting plate 3 and the bottom plate 2 are of a split structure, so that the structural strength of the mounting plate 3 is ensured, and meanwhile, the material of the mounting plate 3 needs to be replaced.

Preferably, the mounting plate 3 can be a block structure formed by die-casting an aluminum alloy material, and the die-casting processing mode enables the size and the quality of a product to be more reliable. The mounting plate 3 made of aluminum alloy has lower density, thereby reducing the mass of the mounting plate 3 and further reducing the cost while ensuring the structural strength of the mounting plate 3.

As shown in fig. 1, the opposite ends of the mounting plates 3 are detachably and fixedly connected with the base plate 2 through second bolt assemblies 6, and the blade shanks of the blades 4 are arranged between the two mounting plates 3 in a penetrating manner. The second bolt assembly 6 comprises a second bolt and a second nut, the second bolt penetrates through the bottom plate 2 and the mounting plate 3 and then is in threaded fixation with the second nut, and the bottom plate 2, the mounting plate 3 and the blade 4 are fixed after the second bolt assembly 6 is locked.

In the present embodiment, in order to stably fix the three of the base plate 2, the mounting plate 3 and the blades 4, four sets of second bolt assemblies 6 are required for fixing each blade 4, and the second bolt assemblies 6 are uniformly distributed at four corners of the mounting plate 3.

The implementation principle of the fan impeller with the unloading angle in the embodiment of the application is as follows:

this application forms alpha contained angle through blade 4 and wheel hub place plane, makes the blade 4 installation back can unload partly vertical decurrent power in the operation process, has reduced the moment of flexure that wheel hub and petiole bore to improve the stability of wheel hub and petiole, the impeller operation is more reliable, and the design strength of wheel hub and 4 petioles of blade can suitably reduce, thereby has reduced product cost. Compared with the traditional fan impeller without an unloading angle, the fan impeller can bear larger wind pressure in the design of the hub and the petiole with the same strength, and provides the impeller with higher performance to adapt to a cooling tower with higher requirements.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a fan wheel at area uninstallation angle which characterized in that: the fan blade comprises a hub fixed on a fan impeller shaft and blades (4) uniformly fixed on the hub, wherein the included angle between the blade handle of each blade (4) and the vertical plane of the axis of the hub is alpha, and the numerical range of alpha is 1-5 degrees.

2. The fan impeller with the unloading angle as recited in claim 1, wherein: the hub comprises a shaft sleeve (1) and fixing pieces, the fixing pieces are uniformly fixed on the shaft sleeve (1), and the blades (4) are fixed at the outer ends of the fixing pieces.

3. The fan impeller with the unloading angle as recited in claim 2, wherein: the fixing piece comprises two bottom plates (2) and N groups of mounting plates (3), wherein the two mounting plates (3) are of a group structure, each group of mounting plates (3) corresponds to one blade (4), the two bottom plates (2) are fixed on two sides of the shaft sleeve (1), the two mounting plates (3) in each group are respectively mounted on two opposite sides of the bottom plates (2), each group of mounting plates (3) is provided with arc concave surfaces on opposite sides, and the arc concave surfaces are matched with the blade handles of the blades (4).

4. The fan impeller with the unloading angle as recited in claim 3, wherein: the bottom plate (2) is detachably and fixedly connected with the shaft sleeve (1) through a first bolt assembly (5).

5. The fan impeller with the unloading angle as recited in claim 4, wherein: the outer side of the shaft sleeve (1) is provided with a positioning groove matched with the bottom plate (2), and the outer end face of the bottom plate (2) and the end face of the shaft sleeve (1) are arranged in a coplanar manner.

6. The fan impeller with the unloading angle as recited in claim 3, wherein: the mounting plate (3) is detachably and fixedly connected with the bottom plate (2) through a second bolt component (6).

7. The fan impeller with the unloading angle as recited in claim 3, wherein: the mounting plate (3) is of a block structure formed by die-casting an aluminum alloy material.

8. The fan impeller with the unloading angle as recited in claim 1, wherein: the included angle alpha between the blade handle of the blade (4) and the vertical plane of the axis of the hub is 3 degrees.