CN218971455U - Ultralow-vibration vertical axial flow fan - Google Patents

Abstract

The utility model discloses an ultralow vibration vertical axial flow fan which comprises an air duct, wherein an inner cylinder is arranged in the air duct, a motor is arranged in the inner cylinder, the rotating end of the motor is connected with an impeller, a plurality of blades are arranged on the impeller, a plurality of guide vanes are arranged between the air duct and the inner cylinder, the impeller is connected with a guide cover, and the number of the blades of the impeller and the number of the guide vanes are prime numbers. The utility model improves the precision and the matching precision of each part through reasonable structural design and installation assembly, and realizes the overall low vibration requirement of the ventilator. The utility model has simple integral structure, convenient installation and operation, can greatly reduce the vibration of the fan, and can be used in special occasions with strong applicability.

Description

Ultralow-vibration vertical axial flow fan

Technical Field

The utility model relates to the technical field of ventilation equipment, in particular to an ultralow-vibration vertical axial flow fan.

Background

The vibration of the existing ventilator is generally checked and delivered according to the limit value in the industry standard, namely, the vibration is 2.8mm/s when in rigid support, and 4.5mm/s when in flexible support; however, in some special occasions, the requirements of customers on vibration are higher, and even the balance quality grade is improved to G1.0, the required index cannot be achieved.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides an ultra-low vibration vertical axial flow fan, which can greatly reduce the vibration of the fan and meet the use in some special occasions.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an ultralow vibration vertical axial fan, includes the dryer, be provided with the inner tube in the dryer, install the motor in the inner tube, the rotating end of motor is connected with the impeller, be provided with a plurality of blades on the impeller, the dryer with be provided with a plurality of guide vanes between the inner tube, the impeller is connected with the kuppe, the blade number of impeller with the quantity of guide vane is prime number each other.

The motor is installed on the inner tube through the bolt, and the inner tube is fixed through stator and dryer, and the pivot of impeller fixed at the motor stretches out the end, and the kuppe is connected on the impeller. The installation angle of the guide vane is determined according to the attack angle of the air flow by modeling and CFD pneumatic analysis in the pneumatic design process of the ventilator, and the attack angle is generally selected from-3 degrees to +3 degrees; the number of blades of the impeller and the number of the guide vanes are prime numbers, so that the impact of air flow on the guide vanes can be avoided, and the pulse of the air flow is reduced; and finally, the air flow in the ventilator flows uniformly, and structural vibration caused by aerodynamic force excitation is reduced.

Further, the mounting positions of the inner cylinder and the motor are located on the central line of the air duct, the offset size is not more than 5mm, and the central height is not more than half of the height of the air duct. The height of the center of gravity of the ventilator is reduced, thereby increasing the stability of the ventilator.

Further, when the structure of the wind cylinder, the inner cylinder, the guide vane and the impeller is designed, the thickness of the impeller is increased, so that 2-6-order modes of the impeller meet the following requirements, the minimum margin of the natural frequency of the 2-order mode is more than or equal to 15%, the minimum margin of the natural frequency of the 3-order mode is more than or equal to 8%, the minimum margin of the natural frequency of the 4-order mode is more than or equal to 6%, the minimum margin of the natural frequency of the 5-order mode is more than or equal to 5%, and the minimum margin of the natural frequency of the 6-order mode is more than or equal to 4%; secondly, by adding reinforcing ribs on the air duct, increasing the thickness t of the air duct, increasing the thickness t1 of the inner cylinder and increasing the number of guide vanes, the rigidity of the ventilator is changed by combining one or more modes, so that the first 6-order natural frequency of a ventilator shell (the air duct, the inner cylinder and the guide vanes) avoids 1.1 times of the excitation frequency of a rotor of the motor, and the avoiding amount is not lower than 20Hz.

Further, the wind barrel is provided with a reinforcing rib, the reinforcing rib is added on the wind barrel, and the rigidity of the ventilator is changed.

Further, the impeller and the guide vane are formed by die machining, the dimension is ensured to be close to the theoretical design linearity, and the accuracy of the outer diameter of the impeller is within the error range of-0.05-0 mm. The dimension processing precision is controlled, the adaptation degree is improved, and the vibration during operation is reduced.

Further, a wave spring is arranged in the motor, and the wave spring selects 3-7 wave numbers. The bearing position of the motor is selected by a wave spring, and proper wave numbers are selected from 3-7 wave numbers according to the stress condition, so that the rigidity of the motor is changed, and the axial clearance is ensured.

Furthermore, the impeller and the rotor of the motor reach G0.4 by improving the balance quality grade, when the impeller and the rotor of the motor perform a dynamic balance test independently, the dynamic balance precision is improved to G0.4, and after the ventilator is assembled, the vibration of the shaft frequency of the ventilator can be reduced by adopting a field integral balance mode, the whole machine is subjected to field integral balance by using a field dynamic balance instrument, and the balance residual quantity of the integral balance is controlled within 50 mg.

Further, the impeller and the motor are in interference fit, so that vibration caused by large gaps between the impeller shaft hole and the motor rotating shaft is reduced.

Further, the impeller is provided with a shaft hole connected with a rotating shaft of the motor, the tolerance of the shaft hole is H7, and the tolerance of the rotating shaft of the motor is j6.

After the measures, the vibration of the ventilator can reach 0.44mm/s.

In conclusion, the precision and the matching precision of all the parts are improved through reasonable structural design and assembly, and the overall low vibration requirement of the ventilator is realized. The utility model has simple integral structure, convenient installation and operation, can greatly reduce the vibration of the fan, and can be used in special occasions with strong applicability.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model.

Labeling and describing: 1. An air duct; 1.1, reinforcing ribs; 2. a guide cover; 3. an impeller; 4. an inner cylinder; 5. a guide vane; 6. an electric motor.

Detailed Description

An embodiment of an ultra-low vibration vertical type axial flow fan according to the present utility model will be further described with reference to fig. 1.

The utility model provides an ultralow vibration vertical axial fan, includes dryer 1, be provided with inner tube 4 in the dryer 1, install motor 6 in the inner tube 4, motor 6's rotation end is connected with impeller 3, be provided with a plurality of blades on the impeller 3, dryer 1 with be provided with a plurality of guide vanes 5 between the inner tube 4, impeller 3 is connected with kuppe 2, impeller 3's blade number with the quantity of guide vane 5 is the prime number each other.

The motor 6 is installed on the inner cylinder 4 through the bolt, and the inner cylinder 4 is fixed with dryer 1 through stator 5, and impeller 3 is fixed at the pivot end that stretches out of motor 6, and kuppe 2 is connected on impeller 3. The installation angle of the guide vane 5 is determined according to the attack angle of the air flow by modeling and CFD pneumatic analysis optimization in the pneumatic design process of the ventilator, and the attack angle is generally selected from-3 degrees to +3 degrees; the number of blades of the impeller 3 and the number of the guide vanes 5 are prime numbers, so that the impact of air flow on the guide vanes 5 can be avoided, and the pulse of the air flow is reduced; and finally, the air flow in the ventilator flows uniformly, and structural vibration caused by aerodynamic force excitation is reduced.

In this embodiment, the installation positions of the inner cylinder 4 and the motor 6 are preferably located on the central line of the air duct 1, the offset dimension is not more than 5mm, and the central height is not more than half of the height of the air duct 1. The height of the center of gravity of the ventilator is reduced, thereby increasing the stability of the ventilator.

In the embodiment, preferably, when the structure of the wind tunnel 1, the inner cylinder 4, the guide vane 5 and the impeller 3 is designed, the thickness of the impeller 3 is increased to enable the impeller 32-6 order mode to meet the following requirements, wherein the minimum margin of the 2-order mode natural frequency is more than or equal to 15%, the minimum margin of the 3-order mode natural frequency is more than or equal to 8%, the minimum margin of the 4-order mode natural frequency is more than or equal to 6%, the minimum margin of the 5-order mode natural frequency is more than or equal to 5%, and the minimum margin of the 6-order mode natural frequency is more than or equal to 4%; secondly, by adding the reinforcing ribs 1.1 on the air duct 1, increasing the thickness t of the air duct 1, increasing the thickness t1 of the inner cylinder 4 and increasing the number of the guide vanes 5, the rigidity of the ventilator is changed by combining one or a plurality of modes, so that the front 6 th order natural frequency of the ventilator shell (the air duct 1, the inner cylinder 4 and the guide vanes 5) avoids 1.1 times of the excitation frequency of the rotor of the motor 6, and the avoiding amount is not lower than 20Hz.

In this embodiment, the air duct 1 is preferably provided with a reinforcing rib 1.1, and the reinforcing rib 1.1 is added on the air duct 1 to change the rigidity of the ventilator.

In this embodiment, the impeller 3 and the guide vane 5 are preferably formed by die machining, so that the dimension is close to the theoretical design linearity, and the accuracy of the outer diameter of the impeller 3 is within the error range of-0.05-0 mm. The dimension processing precision is controlled, the adaptation degree is improved, and the vibration during operation is reduced.

In this embodiment, preferably, a wave spring is disposed inside the motor 6, and the wave spring selects 3-7 wave numbers. The bearing position of the motor 6 is selected by a wave spring, and the rigidity of the motor is changed by selecting a proper wave number from 3-7 wave numbers according to the stress condition, so that the axial clearance is ensured.

In this embodiment, preferably, the rotor of the impeller 3 and the rotor of the motor 6 reach G0.4 by improving the balance quality level, when the impeller 3 and the rotor of the motor 6 perform the dynamic balance test independently, the dynamic balance accuracy is improved to G0.4, and after the ventilator is assembled, the vibration of the shaft frequency of the ventilator can be reduced by adopting a field overall balance mode, the field overall balance is performed on the whole machine by using a field dynamic balance instrument, and the balance residual amount of the overall balance is controlled within 50 mg.

In this embodiment, the impeller 3 and the motor 6 are preferably in interference fit, so as to reduce vibration caused by a large gap between the shaft hole of the impeller 3 and the rotating shaft of the motor 6.

In this embodiment, preferably, the impeller 3 is provided with a shaft hole connected to the rotation shaft of the motor 6, the tolerance of the shaft hole is H7, and the tolerance of the rotation shaft of the motor 6 is j6.

After the measures, the vibration of the ventilator can reach 0.44mm/s.

The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (9)

1. An ultralow vibration vertical axial flow fan which is characterized in that: the novel air conditioner comprises an air duct, an inner cylinder is arranged in the air duct, a motor is arranged in the inner cylinder, the rotating end of the motor is connected with an impeller, a plurality of blades are arranged on the impeller, a plurality of guide vanes are arranged between the air duct and the inner cylinder, the impeller is connected with a guide cover, and the number of the blades of the impeller and the number of the guide vanes are prime numbers.

2. The ultra-low vibration vertical axial flow fan according to claim 1, wherein: the installation positions of the inner cylinder and the motor are positioned on the central line of the air duct, the offset size is not more than 5mm, and the central height is not more than half of the height of the air duct.

3. The ultra-low vibration vertical axial flow fan according to claim 1, wherein: when the structure of the wind tunnel, the inner cylinder, the guide vane and the impeller is designed, the 2-6-order mode of the impeller meets the following requirements, wherein the minimum margin of the natural frequency of the 2-order mode is more than or equal to 15%, the minimum margin of the natural frequency of the 3-order mode is more than or equal to 8%, the minimum margin of the natural frequency of the 4-order mode is more than or equal to 6%, the minimum margin of the natural frequency of the 5-order mode is more than or equal to 5%, and the minimum margin of the natural frequency of the 6-order mode is more than or equal to 4%; and secondly, the first 6-order natural frequency of the wind barrel, the inner barrel and the guide vane avoids 1.1 times of the excitation frequency of the rotor of the motor, and the avoiding amount is not lower than 20Hz.

4. The ultra-low vibration vertical axial flow fan according to claim 3, wherein: the wind cylinder is provided with a reinforcing rib.

5. The ultra-low vibration vertical axial flow fan according to claim 1, wherein: the impeller and the guide vane are formed by die machining, the dimension is ensured to be close to the theoretical design linearity, and the accuracy of the outer diameter of the impeller is within the error range of-0.05-0 mm.

6. The ultra-low vibration vertical axial flow fan according to claim 1, wherein: the motor is internally provided with a wave spring, and the wave spring selects 3-7 wave numbers.

7. The ultra-low vibration vertical axial flow fan according to claim 1, wherein: the impeller and the rotor of the motor reach G0.4 by improving the balance quality level.

8. The ultra-low vibration vertical axial flow fan according to claim 1, wherein: the impeller and the motor are in interference fit.

9. The ultra-low vibration vertical axial flow fan according to claim 8, wherein: the impeller is provided with a shaft hole connected with a rotating shaft of the motor, the tolerance of the shaft hole is H7, and the tolerance of the rotating shaft of the motor is j6.

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