CN111927824B

CN111927824B - Turbine rotor assembly and turbofan

Info

Publication number: CN111927824B
Application number: CN202010987822.9A
Authority: CN
Inventors: 张龙飞; 王永红; 李国斌; 孙杰
Original assignee: Vofon Turbo Systems Ningbo Co ltd
Current assignee: Ningbo Fengwo booster Technology Co.,Ltd.
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2020-12-22
Anticipated expiration: 2040-09-18
Also published as: CN111927824A

Abstract

The invention discloses a turbine rotor assembly and a turbine fan, which comprise an impeller and a transmission shaft, wherein the impeller comprises an impeller body and a cover body, one side of the impeller body is provided with a plurality of blades, raised lines are formed on the blades, the blades and the cover body are fixed by welding, the transmission shaft is provided with a first shaft section and a second shaft section, the first shaft section is clamped with the impeller body, the second shaft section is used for being in transmission connection with a motor, the first shaft section is made of a first material, the second shaft section is made of a second material, and the heat conductivity coefficient of the first material is greater than that of the second material. According to the turbine rotor assembly and the turbine fan, the impeller body and the cover body are stably connected, the impeller body and the transmission shaft are stably connected, the turbine rotor assembly and the turbine fan can be suitable for high-speed rotation, and the overall reliability of a turbine rotor assembly system is high.

Description

Turbine rotor assembly and turbofan

Technical Field

The invention relates to the technical field of fans, in particular to a turbine rotor assembly and a turbine fan.

Background

With the gradual appearance of the aging society, the respiratory mucosa of the old people gradually shrinks, the secretion function is reduced, the respiratory function is weakened, and the quantity of the inhaled and discharged gas in the body is correspondingly reduced, so that the exhaust of waste gas and the inhalation of fresh air are influenced. The respirator is a medical instrument which can replace or assist the respiratory function of a person, the ventilation capacity of the lung is increased through a fan in the respirator, the respiratory function is improved, the consumption of the respiratory function is reduced, the oxygen metabolism is improved, and continuous ventilation and respiration can be maintained when the patient stops breathing and loses the autonomous respiratory function, so that the metabolism and the life continuation are maintained.

The fan is the core spare part of breathing machine, and the performance of fan is closely related with breathing machine treatment, has decided the performance of breathing machine good and bad, and the fan includes impeller and brushless high speed motor, drives impeller through brushless high speed motor and rotates, and prior art's problem mainly lies in: the output shaft of the brushless high-speed motor is fixedly connected with the impeller through press fitting interference fit, so that poor bonding force between the output shaft of the brushless high-speed motor and the impeller is caused, the connection strength between the impeller and the cover body is poor, when the output shaft of the brushless high-speed motor rotates at high speed, the impeller and the output shaft as well as the impeller and the cover body are easy to loosen, the use of the fan is influenced, in addition, the pressure and the flow of the fan are higher and higher, the size is strictly limited, the brushless high-speed motor has to be improved in rotating speed and increased in current to deal with, therefore, the brushless high-speed motor can generate a large amount of heat, if the heat cannot be taken away in time, the temperature of the brushless high-speed motor is greatly increased, and the electrical safety.

Disclosure of Invention

The turbine rotor assembly and the turbofan are provided aiming at the defects of the prior art, the impeller body and the cover body are connected stably, the impeller body and the transmission shaft are connected stably, the turbine rotor assembly and the turbofan are suitable for high-speed rotation, and the system reliability is high.

In order to achieve the above object, the present invention provides the following technical solutions.

A turbine rotor assembly comprises an impeller made of plastic materials and a transmission shaft made of metal materials, wherein the impeller comprises an impeller body and a cover body, a plurality of blades are arranged on the impeller body, and the impeller body and the cover body are welded into a whole through raised lines arranged on the upper end surfaces of the blades; the transmission shaft is composed of a first shaft section and a second shaft section in fixed connection, the first shaft section is connected with the impeller body, the second shaft section is used for being in transmission connection with the motor, the first shaft section is made of a first material, the second shaft section is made of a second material, and the heat conductivity coefficient of the first material is larger than that of the second material.

The invention has the beneficial effects that: according to the turbine rotor assembly, the raised strips are formed on the blades, so that the welding between the blades and the cover body is facilitated, the strength after welding can be enhanced, in addition, the transmission shaft is arranged into the first shaft section and the second shaft section, the first shaft section is connected with the impeller body, the bonding force between the first shaft section and the impeller body is strong, the connection is stable, the first shaft section and the second shaft section are arranged into two different materials, the heat conductivity coefficient of the first material is larger than that of the second material, the heat conduction effect of the first shaft section is good, heat generated during rotation can be dissipated timely, the heating is reduced, and the reliability of a system is improved.

As an improvement of the invention, each blade is provided with 1-2 convex strips, the width of each convex strip is 0.2-0.5mm, and the height of each convex strip is 0.1-0.2 mm. Through the improvement, the welding between the blade and the cover body is convenient.

As an improvement of the invention, a plurality of grooves for filling the melting material at the welding position are arranged at the position of the lower end surface of the cover body corresponding to the convex strips. Through the improvement, the groove is beneficial to increasing the welding area and eliminating the residues at the welding position.

As an improvement of the invention, the first material is copper or aluminum material, and the second material is steel material; the first shaft section and the second shaft section are welded or bonded into a whole. Through the improvement, the heat conduction effect of copper is good, heat can be timely dissipated, and the first shaft section and the second shaft section are convenient to connect.

As an improvement of the invention, the first shaft section is sequentially provided with a connecting part adjacent to the second shaft section, a supporting part matched with an inner hole of the impeller body and a combining part connected with the impeller, the diameter of the combining part is larger than that of the supporting part, and the impeller and the transmission shaft are integrally injected through the combining part. Through the improvement, cohesion between increase transmission shaft joint portion and the impeller is compared with interference pressure equipment among the current scheme, the impeller pass through the joint portion with the transmission shaft mould plastics as an organic wholely, the cohesion strengthens greatly, the axiality between impeller and the transmission shaft is better, make to be connected stably between transmission shaft and the impeller, the setting of joint portion can increase the surface area of first shaft section moreover, thereby make the heat radiating area of first shaft section bigger, the heat that produces when being favorable to rotating first shaft section effluvium, reduce and generate heat, improve system reliability.

As an improvement of the invention, the combining part is composed of at least two combining parts which are arranged at intervals along the axial direction and are in a cone frustum shape, a combining groove can be formed between the adjacent combining parts, the sizes of the combining parts are gradually reduced from bottom to top, each combining part is provided with an arc envelope line matched with the impeller body, a plurality of radial notches are symmetrically formed on the combining parts, connecting blocks are formed between the adjacent radial notches, and the impeller body is provided with connecting grooves matched with the connecting blocks. Through setting up the notch, strengthened impeller anti-rotation's cohesion.

As an improvement of the present invention, a convex portion exposed to the upper end surface of the impeller body is further disposed at the top end of the first shaft section. Through the improvement, the dynamic balance weight removal is facilitated, and the heat dissipation effect is facilitated.

As an improvement of the invention, the transmission shaft is provided with a vent hole along the axial direction.

As an improvement of the invention, the periphery of the cover body is provided with a dynamic balance weight-removing ring, the width of the dynamic balance weight-removing ring is 2-5mm, and the thickness of the dynamic balance weight-removing ring is 1.2-1.8 mm. Through the improvement, dynamic balance weight removal is facilitated.

The utility model provides a turbofan, includes spiral case, atmoseal board, motor and turbine rotor subassembly, the spiral case set up turbine rotor subassembly periphery, the atmoseal board set up in impeller body and motor between, just atmoseal board and motor end cover fixed connection.

Drawings

FIG. 1 is a schematic view of a turbine rotor assembly and an electric machine of the present invention.

Fig. 2 is a schematic view (another angle) of the turbine rotor assembly of the present invention and an electric machine.

Fig. 3 is a schematic view of the matching structure of the motor and the transmission shaft of the invention.

Fig. 4 is a schematic view of the structure of the first shaft section and the impeller body.

Fig. 5 is a schematic structural view of the impeller body of the present invention.

Fig. 6 is a schematic view of the structure of the cover body of the present invention.

Fig. 7 is a schematic view (another angle) of the cover structure of the present invention.

Fig. 8 is a schematic view of the first shaft segment configuration of the present invention.

Fig. 9 is a schematic view of a turbofan configuration of the present invention.

Fig. 10 is a cross-sectional schematic view of fig. 9 of the present invention.

Fig. 11 is an enlarged view of a portion of fig. 10 according to the present invention.

Figure 12 is a schematic view of the volute configuration of the present invention.

In the figure, 1, impeller; 1.1, an impeller body; 1.11, a blade; 1.12, convex strips; 1.13, connecting grooves; 1.2, a cover body; 1.21, a groove; 1.22, a dynamic balance weight-removing ring; 2. a drive shaft; 2.1, a first shaft section; 2.11, a connecting part; 2.12, a support part; 2.13, a joint part; 2.14, convex parts; 2.15, radial notches; 2.16, vent holes; 2.2, a second shaft section; 3. a motor; 4. a volute; 4.1, a cavity; 4.2, an air inlet; 4.3, an air outlet; 4.4, an air duct; 5. and an air seal plate.

Detailed Description

The invention is further explained with reference to the drawings.

Referring to fig. 1 to 7, the turbine rotor assembly includes an impeller 1 made of a plastic material and a transmission shaft 2 made of a metal material, the impeller 1 includes an impeller body 1.1 and a cover body 1.2, the impeller body 1.1 is provided with a plurality of blades 1.11, and the impeller body 1.1 and the cover body 1.2 are welded together by a convex strip 1.12 arranged on the upper end surface of the blade 1.11; each blade 1.11 is provided with 1-2 convex strips 1.12, the width of the convex strips 1.12 is 0.2-0.5mm, and the height is 0.1-0.2 mm. The number and the size of the convex strips 1.12 are moderate, so that the convex strips 1.12 are prevented from being designed too much, are not beneficial to processing, and have poor strength after welding; in this embodiment, the blade 1.11 and the cover 1.2 are welded together by ultrasonic welding, so that the low-melting-point material is more easily welded by ultrasonic welding, and the loss of strength after welding is smaller compared with the high-melting-point material.

The lower end of the cover body 1.2 is provided with a plurality of grooves 1.21 for filling the melting stock at the welding position at the position corresponding to the convex strips 1.12. Through setting up this recess 1.21, both be favorable to increasing the welding area, also be favorable to eliminating the welding process residue of welding department.

The impeller 1 is of plastics material, which may be PA6, with the addition of 15% glass fibre and suitable glass beads. Through the improvement, the strength of the impeller 1 is good, and the deformation amount is smaller. Furthermore, tests have shown that it is difficult for the reinforced glass or carbon fibers to reach a molten state at the weld, and thus it is difficult to contribute to the strength of the weld and sometimes adversely affect it. Experiments show that for the strength of a welding position, the PA6 glass fiber with the content of 15% and the proper glass beads are selected to have better strength and more economical efficiency than the PA66GF40 high glass fiber content and the high-temperature nylon PPGF 30 glass fiber.

According to the turbine rotor assembly, the raised strips 1.12 are formed on the blades 1.11, welding between the blades 1.11 and the cover body 1.2 is facilitated, strength after welding can be enhanced, in addition, the transmission shaft 2 is arranged into the first shaft section 2.1 and the second shaft section 2.2, the first shaft section 2.1 is connected with the impeller body 1.1, the bonding force between the first shaft section 2.1 and the impeller body 1.1 is strong, connection is stable, the first shaft section 2.1 and the second shaft section 2.2 are arranged into two different materials, the heat conductivity coefficient of the first material is larger than that of the second material, the heat conduction effect of the first shaft section 2.1 is good, heat generated when the motor 3 rotor rotates can be dissipated timely, heating is reduced, and the overall reliability of the turbine rotor assembly is improved.

The transmission shaft 2 is formed by fixedly connecting a first shaft section 2.1 and a second shaft section 2.2, the first shaft section 2.1 is connected with the impeller body 1.1, the second shaft section 2.2 is used for being in transmission connection with the motor 3, wherein the first shaft section 2.1 is made of a first material, the second shaft section 2.2 is made of a second material, and the heat conductivity coefficient of the first material is greater than that of the second material; the second material is a magnetically permeable material.

The first material is copper or aluminum material, and the second material is steel material; the heat conduction of copper is effectual, can in time dispel the heat, and the intensity of steel is good, and the steel more accords with 3 rotor materials of motor, is connected the back with motor 3, and load effect is good, and first shaft section 2.1 and second shaft section 2.2 are as an organic whole through friction weld, laser welding or glue bonding for it is convenient to be connected between first shaft section 2.1 and the second shaft section 2.2.

As shown in fig. 8, the first shaft section 2.1 is sequentially provided with a connecting portion 2.11 adjacent to the second shaft section 2.2, a supporting portion matched with an inner hole of the impeller body 1.1, a combining portion 2.13 connected with the impeller 1, and a convex portion 2.14 with the top end exposed out of the upper end surface of the impeller body 1.1, and the diameter of the combining portion 2.13 is larger than that of the supporting portion, so that the combining portion 2.13 can extend into the impeller 1, and the impeller 1 and the transmission shaft 2 are integrally injection-molded through the combining portion 2.13; through the improvement, the binding force between the first shaft section 2.1 and the impeller 1 is increased, compared with the interference press-fitting in the existing scheme, the axial size of the insert in the existing scheme is smaller, the assembly error of more than 10 micrometers exists between the insert and a mold, the tolerance of an inner hole of the insert is 10-15 micrometers, and the press-fitting may bring about an error of 20-30 micrometers. In the scheme of the application, the center of the joint part 2.13 of the first shaft section 2.1 is the center of the impeller 1, the one-time injection molding is integrated, the coaxiality of the first shaft section 2.1 and the impeller 1 is high, the error can be controlled to be 5-8 micrometers, the original unbalance of the turbofan can be well controlled, the problem of high-speed rotating noise caused by dynamic balance is greatly reduced, the binding force is greatly enhanced, the first shaft section 2.1 and the impeller 1 are stably connected, the surface area of the first shaft section 2.1 can be increased due to the arrangement of the joint part 2.13, the heat dissipation area of the first shaft section 2.1 is larger, heat generated when the first shaft section 2.1 rotates can be dissipated, heating is reduced, and the reliability of the system is improved.

Specifically, the combining part 2.13 is composed of at least two combining parts which are arranged along the axial direction at intervals and are in a cone frustum shape, a combining groove is formed between every two adjacent combining parts respectively, the sizes of the combining parts are gradually reduced from bottom to top, a plurality of radial notches 2.15 are symmetrically formed in the combining parts, a connecting block is formed between every two adjacent radial notches 2.15, the impeller body 1.1 is provided with a connecting groove 1.13 matched with the connecting block, when the first shaft section 2.1 is connected with the impeller 1, the connecting block is clamped in the connecting groove 1.13, the combining force between the combining parts and the impeller 1 is increased, compared with the interference press mounting in the existing scheme, the combining force of the scheme is greatly enhanced, the coaxiality is better, and the connection between the transmission shaft 2 and the impeller. Through forming the combination groove along between the adjacent binder of axial, impeller 1 stretches into the combination inslot, increased the axial cohesion between transmission shaft 2 and the impeller 1, can carry out the axial spacing, through radially having set up radial notch 2.15 along the binder, form the connecting block between the adjacent radial notch 2.15, the connecting block cooperatees with spread groove 1.13, radial cohesion between impeller 1 and the transmission shaft 2 has been strengthened, can carry out the circumference spacing, can effectively prevent the possibility of the potential drunkenness when transmission shaft 2 high-speed rotatory. In addition, each connector is provided with an arc envelope line matched with the impeller body 1.1, the first shaft section 2.1 can drive the connectors to rotate when working, so that the arc envelope lines are arranged on the connectors to meet the fluid design requirements of the impeller 1, the connectors have larger area and are directly exposed in flowing gas, and the heat dissipation is facilitated. The top end of the first shaft section 2.1 is also provided with a convex part 2.14 exposed out of the upper end surface of the impeller body 1.1, so that the extending part of the end part of the first shaft section 2.1 is exposed out, and the heat dissipation and the dynamic balance weight removal are facilitated.

The transmission shaft 2 is provided with air vents 2.16 along the axial direction, so that air flow can be well formed during rotation, and heat generated by the rotor of the motor 3 is taken out. The periphery of the cover body 1.2 is provided with a dynamic balance weight-removing ring 1.22, the width of the dynamic balance weight-removing ring 1.22 is 2-5mm, and the thickness is 1.2-1.8 mm. Through the improvement, dynamic balance weight removal is facilitated.

Referring to fig. 9 to 12, the turbofan includes a volute 4, an air seal plate 5, a motor 3 and a turbine rotor assembly, the volute 4 is disposed at the periphery of the turbine rotor assembly, the air seal plate 5 is disposed between an impeller body 1.1 and the motor 3, and the air seal plate 5 is fixedly connected to an end cover of the motor 3. The volute 4 is provided with a cavity 4.1, an air inlet 4.2 communicated with the cavity 4.1, an air duct 4.4 communicated with the cavity 4.1 and an air outlet 4.3 arranged on the air duct 4.4, and the connecting groove 1.13 is arranged adjacent to the air inlet 4.2. Therefore, when the transmission shaft 2 is connected with the impeller 1, the connecting block is also arranged adjacent to the air inlet 4.2, so that heat can be dissipated from the air outlet 4.3 in time, the heat can be prevented from being concentrated in the cavity 4.1, and the stability of the system is further improved.

When the motor 3 works, the second shaft section 2.2 is driven to rotate and then is transmitted to the first shaft section 2.1, so that the impeller 1 is driven to rotate, external air flow is sucked into the cavity 4.1 from the air inlet by the rotation of the impeller 1, and the external air flow is sprayed out from the air outlet 4.3 through the air duct 4.4 after being pressurized.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.

Claims

1. The utility model provides a turbine rotor subassembly, includes plastic material's impeller and metal material's transmission shaft, its characterized in that: the impeller comprises an impeller body and a cover body, wherein the impeller body is provided with a plurality of blades, each blade is provided with 1-2 convex strips, and the lower end surface of the cover body is provided with a plurality of grooves for filling molten materials at welding positions corresponding to the convex strips; the impeller body and the cover body are welded into a whole through the raised lines arranged on the upper end surfaces of the blades; the transmission shaft is formed by fixedly connecting a first shaft section and a second shaft section, the first shaft section is connected with the impeller body, the second shaft section is used for being in transmission connection with the motor, the first shaft section is made of a first material, the second shaft section is made of a second material, the heat conductivity coefficient of the first material is greater than that of the second material, the first material is copper or aluminum, and the second material is steel; the first shaft section and the second shaft section are welded or bonded into a whole; the first shaft section is sequentially provided with a connecting part adjacent to the second shaft section, a supporting part matched with an inner hole of the impeller body and a combining part connected with the impeller, the diameter of the combining part is larger than that of the supporting part, and the impeller and the transmission shaft are integrally molded through the combining part; the combined part consists of at least two combined parts which are arranged at intervals along the axial direction and are in a cone frustum shape, a combined groove can be formed between the adjacent combined parts, the impeller extends into the combined groove, the axial combining force between the transmission shaft and the impeller is increased, and the axial limiting can be carried out; the size of the combining parts is gradually reduced from bottom to top, each combining part is provided with an arc envelope line matched with the impeller body, a plurality of radial notches are symmetrically formed in the combining parts, connecting blocks are formed between adjacent radial notches, the impeller body is provided with connecting grooves matched with the connecting blocks, the radial binding force between the impeller and the transmission shaft is enhanced, and circumferential limiting can be achieved.

2. The turbine rotor assembly of claim 1 wherein: the width of the convex strip is 0.2-0.5mm, and the height of the convex strip is 0.1-0.2 mm.

3. The turbine rotor assembly of claim 1 wherein: the top end of the first shaft section is also provided with a convex part exposed out of the upper end surface of the impeller body.

4. The turbine rotor assembly of claim 1 wherein: the transmission shaft is provided with a vent hole along the axial direction.

5. The turbine rotor assembly of claim 1 wherein: the periphery of the cover body is provided with a dynamic balance weight-removing ring, the width of the dynamic balance weight-removing ring is 2-5mm, and the thickness of the dynamic balance weight-removing ring is 1.2-1.8 mm.

6. A turbofan, characterized by: the turbine rotor assembly comprises a volute, an air sealing plate, a motor and the turbine rotor assembly according to any one of claims 1 to 5, wherein the volute is arranged on the periphery of the turbine rotor assembly, the air sealing plate is arranged between the impeller body and the motor, and the air sealing plate is fixedly connected with a motor end cover.