CN214196764U - Novel connecting structure of centrifugal compressor impeller and power shaft - Google Patents

Abstract

The utility model relates to a novel connection structure of centrifugal compressor impeller and power shaft belongs to compressor technical field, is to impeller and power shaft and has the defect of running stability difference to propose when equipping, and it includes: the end face tooth structure I is processed at the outer edge of the end face of the power shaft, the connecting section is arranged in the center of the end face of the power shaft and extends outwards, the end face tooth structure II is processed at the back side of the wheel disc wheel, and the annular flange is arranged at the back side of the wheel disc wheel; the center of rim plate is seted up the central through-hole of echelonment along its length direction, and the linkage segment has the echelonment structure of internal and external screw thread for the tip processing, and the central through-hole is worn to locate by the linkage segment, and the tip of linkage segment stretches out back and lock nut threaded connection in the rim plate, realizes through lock nut that the terminal surface tooth structure I of driving shaft is connected with the terminal surface tooth structure II of rim plate compresses tightly, is equipped with stop screw between linkage segment and lock nut. The utility model relates to a connect reliably, stability is high.

Description

Novel connecting structure of centrifugal compressor impeller and power shaft

The technical field is as follows:

the utility model belongs to the technical field of the compressor, concretely relates to novel connection structure of centrifugal compressor impeller and power shaft.

Background art:

a centrifugal compressor is a mechanical device that rotates at high speed to obtain high pressure and temperature of a gas. The impeller is used as a main working component of the centrifugal compressor, when the centrifugal compressor works, the impeller rotates at a high speed along with the power shaft, torque is transmitted to the impeller from the power shaft, and the impeller is subjected to a larger axial thrust action due to a larger gas pressure difference between the working side of the impeller and the back side of the impeller, so that the reliability of the connection between the centrifugal impeller and the power shaft is very important.

The common shape of the joint of the impeller and the shaft is provided with a cylindrical shaft hole and a triangular shaft hole, wherein the cylindrical shaft hole needs to adopt a key to transmit power, and a gap often exists between the shaft and the hole, so that the power shaft and the impeller are easy to generate eccentricity and further generate vibration in the operation process, and the impeller is only suitable for equipment with lower rotating speed and lower precision requirement; the triangular shaft hole can avoid the defect generated by the combination of the high-speed main shaft and the cylindrical surface of the impeller, increases the matching degree of the matching surface, improves the running stability, and can be suitable for high-speed rotation.

The invention content is as follows:

the utility model discloses an overcome and have the defect of running stability difference when current impeller and power shaft assemble, provide a novel connection structure of centrifugal compressor impeller and power shaft, this connection structure can be connected to high-speed centrifugal compressor's impeller and centrifugal compressor's power shaft reliably and be in the same place, gives centrifugal compressor's impeller with power shaft output torque safety, reliably transmission to satisfy the work needs.

The utility model discloses a technical scheme lie in: a novel centrifugal compressor impeller and power shaft connecting structure comprises: the end face tooth structure I is processed at the outer edge of the end face of the power shaft, the connecting section is arranged in the center of the end face of the power shaft and extends outwards, the end face tooth structure II is processed at the back side of the wheel disc wheel, and the annular flange is arranged at the back side of the wheel disc wheel, and the end face tooth structure I is meshed with the end face tooth structure II; the center of the wheel disc is provided with a stepped central through hole along the length direction of the wheel disc, the connecting section is of a stepped structure with inner and outer threads processed at the end part, the connecting section penetrates through the central through hole and is matched with the central through hole, the end part of the connecting section extends out of the wheel disc and then is in threaded connection with the locking nut, the end face tooth structure I of the power shaft is in compression connection with the end face tooth structure II of the wheel disc through the locking nut, and a locking screw is further arranged between the connecting section and the locking nut.

Preferably, the central through hole adopts a three-step structure, and the middle part of the central through hole is in interference fit with the connecting section.

Preferably, a countersunk hole is formed in the top end of the lock nut, and the anti-loose screw penetrates through the countersunk hole and is screwed with the end part of the connecting section.

Preferably, a stop washer is arranged in the countersunk hole, and the anti-loose screw penetrates through the stop washer to be connected with the connecting section.

Preferably, the blades are uniformly distributed on the working side of the wheel disc in the circumferential direction and are of a bent plate-shaped structure.

The utility model has the advantages that:

1. the utility model discloses design the link into an organic whole structure with the power shaft, adopt face of cylinder interference fit form with link and rim plate, effectively solved a series of problems that lead to because of the axiality is inconsistent between power shaft, link and the rim plate, avoided bringing the not hard up danger of impeller because of sectional type screw thread transmission, the cooperation between locking screw, lock nut, the link has also effectively reduced the not hard up danger that leads to the departure of impeller simultaneously.

2. The utility model relates to a simple structure, processing is convenient, and the centering precision is high, and it is comparatively convenient to install, dismantle, can realize safe and reliable ground with centrifugal impeller and power shaft and be connected, guarantees the stability of compressor during operation impeller.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a three-dimensional schematic view of a power shaft;

FIG. 3 is a cross-sectional view of the power shaft;

FIG. 4 is a three-dimensional schematic view of an impeller;

FIG. 5 is a cross-sectional view of the impeller;

wherein: the structure comprises a power shaft 1, 11 end face tooth structures I and 12 connecting sections, a wheel disc 2, 21 end face tooth structures II, 22 annular flanges, 23 central through holes, 3 locking nuts, 4 locking screws, 5 stop washers and 6 blades.

The specific implementation mode is as follows:

as shown in fig. 1, the utility model relates to a novel connection structure of centrifugal compressor impeller and power shaft, include: the locking device comprises a face tooth structure I11 processed on the outer edge of the end face of the power shaft 1, a connecting section 12 arranged at the center of the end face of the power shaft 1 and extending outwards, a face tooth structure II21 processed on the back side of the wheel 2, an annular flange 22 arranged on the back side of the wheel 2, a locking nut 3, a locking screw 4 and a stop washer 5.

As shown in fig. 2 and 3, the power shaft 1 is a source of rotational torque of the centrifugal compressor impeller and provides power for normal operation of the entire centrifugal compressor. The end face tooth structure I11 is processed on the outer edge of the end face of the connecting end of the power shaft 1 and the wheel disc 2 and is used for being matched with the wheel disc 2 to realize torque transmission. The connecting section 12 is a part of the end face center of the connecting end of the power shaft 1 and the wheel disc 2 extending outwards, a stepped shaft-shaped structure with internal and external threads is processed at the end part of the connecting section 12, and an external cylindrical surface with a larger diameter and a central hole of the wheel disc 2 are in interference fit with each other through a cylindrical surface, so that the concentricity is ensured, and the transmission of torque can be realized; an external thread used for being connected with the lock nut 3 is arranged at the end part of the connecting section 12, and an internal thread hole used for being matched with the anti-loosening screw 4 is arranged at the center of the end part of the connecting section 12 so as to prevent the nut 3 from loosening.

As shown in fig. 4 and 5, the impeller includes a wheel disc 2 and blades 6, the wheel disc 2 is a disc-shaped part, one side of the wheel disc 2 is a working side, the working side is an arc surface, the blades 6 are uniformly distributed on the working side of the wheel disc 2 in the circumferential direction, the blades 6 are bent plate-shaped structures and are obliquely fixed on the wheel disc 2, and the gas rotates at a high speed under the action of the blades 6 to increase the pressure; the other side of the wheel disc 2 is a wheel back side, a short shaft is arranged on the wheel back side of the wheel disc 2, a face tooth structure II21 is machined at the end of the short shaft, and the face tooth structure II21 is matched with a face tooth structure I11 of the power shaft 1 to realize torque transmission. An annular flange 22 is provided in the middle of the wheel back of the wheel disc 2, said annular flange 22 serving for sealing against high-pressure gas. A three-step central through hole 23 is arranged at the center of the wheel disc 2 along the length direction, and the central through hole 23 at the middle position is in interference fit with the outer cylindrical surface of the connecting section 12.

The connecting section 12 penetrates through the central through hole 23, the end part of the connecting section 12 extends out of the wheel disc 2 and then is in threaded connection with the locking nut 3, and the locking nut 3 is used for realizing the compression connection after the end face tooth structure I11 of the power shaft 1 is meshed with the end face tooth structure II21 of the wheel disc 2, so that the impeller can work safely and reliably. The shape of the lock nut 3 is a combination of a hemispherical surface and a conical surface, an internal thread matched with the external thread of the connecting section 12 is arranged at the center of one end of the lock nut 3, and the pretightening force of the lock nut and the external thread can be increased after the lock nut is screwed down; the other end of the locking nut 3 is provided with a counter bore. Still be equipped with locking screw 4 between linkage segment 12 and lock nut 3, locking screw 4 is standard hexagon socket head cap screw, locking screw 4 passes the counter bore and screws with the internal thread of linkage segment 12 tip, prevent that lock nut 3 from being used for producing not hard up when high-speed rotatory, and be equipped with lock washer 5 in the counter bore, cooperate with locking screw 4 through lock washer 5, can effectively avoid locking screw 4 to drop because of not hard up production, lock washer 5 screws up the back with locking screw 4, can be with the counter bore edge part of lock nut 3 tip part firmly, further reduce the not hard up possibility of locking screw 4.

The installation process comprises the following steps:

the connecting section 12 at the end part of the power shaft 1 extends into the central through hole 23 of the wheel disc 2, the middle position of the central through hole 23 is in interference fit with the outer cylindrical surface of the connecting section 12, at the moment, the end face tooth structure I11 is meshed with the end face tooth structure II21, then the lock nut 3 is in threaded connection with the end part of the connecting section 12, the lock washer 5 is installed in a countersunk hole of the lock nut 3, and finally the lock screw 4 penetrates through the lock washer 5 and then is in threaded connection with the connecting section 12.

The above description is only the preferred embodiments of the present invention, and these embodiments are all based on the present invention, and the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. The utility model provides a novel connection structure of centrifugal compressor impeller and power shaft which characterized in that includes: the end face tooth structure comprises an end face tooth structure I (11) machined on the outer edge of the end face of the power shaft (1), a connecting section (12) arranged in the center of the end face of the power shaft (1) and extending outwards, an end face tooth structure II (21) machined on the back side of a wheel of the wheel disc (2) and an annular flange (22) arranged on the back side of the wheel disc (2), wherein the end face tooth structure I (11) is meshed with the end face tooth structure II (21); offer central through-hole (23) of echelonment at the center of rim plate (2) along its length direction, linkage segment (12) have the echelonment structure of internal and external screw thread for the tip processing, linkage segment (12) are worn to locate central through-hole (23), and rather than the adaptation, the tip of linkage segment (12) stretches out back and lock nut (3) threaded connection in following rim plate (2), realize through lock nut (3) that the terminal surface tooth structure I (11) of power shaft (1) is connected with compressing tightly of the terminal surface tooth structure II (21) of rim plate (2), still be equipped with locking screw (4) between linkage segment (12) and lock nut (3).

2. The structure for connecting a centrifugal compressor impeller and a power shaft as claimed in claim 1, wherein: the central through hole (23) adopts a three-step structure, and the middle part of the central through hole (23) is in interference fit with the connecting section (12).

3. The structure for connecting a centrifugal compressor impeller and a power shaft as claimed in claim 2, wherein: the top end of the locking nut (3) is provided with a counter bore, and the anti-loosening screw (4) penetrates through the counter bore and is screwed with the end part of the connecting section (12).

4. A novel centrifugal compressor impeller and power shaft connection structure as claimed in claim 3, wherein: a stop washer (5) is arranged in the countersunk hole, and the anti-loose screw (4) penetrates through the stop washer (5) to be connected with the connecting section (12).

5. A new connecting structure of centrifugal compressor impeller and power shaft according to any one of claims 1-4, characterized in that: blades (6) are uniformly distributed on the working side of the wheel disc (2) in the inclined circumferential direction, and the blades (6) are of a bent plate-shaped structure.

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