CN215817790U

CN215817790U - Motor rotating shaft mounting structure for air compressor

Info

Publication number: CN215817790U
Application number: CN202121506116.4U
Authority: CN
Inventors: 钟仁志; 袁军; 韩春江
Original assignee: Xinlei Compressor Co Ltd
Current assignee: Xinlei Compressor Co Ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2022-02-11
Anticipated expiration: 2031-07-02

Abstract

The utility model discloses a motor rotating shaft mounting structure for an air compressor, which comprises a shell and an impeller rotating shaft arranged in the middle of the shell, wherein an impeller is arranged at the front end of the impeller rotating shaft, an assembly component is arranged on the outer side of the impeller, the assembly component comprises a self-correcting ring arranged at the front end of the impeller, and a volute is arranged on the outer edge of the self-correcting ring; wherein the self-correcting ring has a hardness less than that of the impeller; the rear end of the impeller rotating shaft is provided with a vibration reduction gasket which is of a composite structure. Form the seal to the power core through setting up the self-correcting type ring that hardness is less than the impeller on the casing, the damping gasket that cooperation impeller pivot afterbody set up, through the impeller self-correcting type ring cutting self-correcting type ring accomplish the automatic correction of assembly precision in the operation process, weaken the vibration intensity simultaneously, improve organism stability.

Description

Motor rotating shaft mounting structure for air compressor

Technical Field

The utility model relates to the technical field of compressor production and manufacturing, in particular to a motor rotating shaft mounting structure for an air compressor.

Background

The compressor is a driven fluid machine for raising low-pressure gas into high-pressure gas, and is a heart of a refrigeration system, and sucks low-temperature and low-pressure refrigerant gas from an air suction pipe, drives a piston to compress the refrigerant gas through the operation of a motor, and discharges the high-temperature and high-pressure refrigerant gas to an air discharge pipe to provide power for a refrigeration cycle, so that the refrigeration cycle of compression → condensation (heat release) → expansion → evaporation (heat absorption) is realized. The rotating shaft of the impeller is a core driving part of the impeller, and whether the assembling precision meets the requirement is one of the decisive factors of the working stability of the compressor after the whole machine is installed.

For example, chinese patent document (publication No. CN 202560564U) discloses a "scroll air compressor", which includes a compressor main unit and a motor unit, wherein the compressor main unit includes a fixed scroll, a movable scroll, a connecting frame, a main shaft, an eccentric shaft section and a driving bearing, the fixed scroll and the movable scroll are engaged with each other, the eccentric shaft section is disposed at a shaft end of the main shaft and is eccentrically arranged with the main shaft, the movable scroll is mounted on the eccentric shaft section through the driving bearing, and the connecting frame is connected with the fixed scroll; the motor part comprises a motor front cover, a motor shell, a stator part, a rotor part and a motor shaft, wherein the stator part is arranged in a cavity of the motor shell, and the rotor part is arranged on the motor shaft. The motor part is fixed on a connecting frame of a compressor main body part through a motor front cover, and a motor shaft is directly formed by extending a main shaft for driving the movable scroll disk to the direction of a cavity of a motor shell.

Although the technical scheme can be small in size and low in cost, when the rotating speed of the compressor reaches 20000 revolutions or above, the assembly precision of the power core of the compressor is sensitive to the whole compressor, once the assembly defect occurs, the micro-vibration generated after the impeller is started can interfere with the shell, the blade is broken or even the whole compressor is scrapped, and the consequence is very serious.

Disclosure of Invention

Aiming at the problems that the assembly requirement of a high-speed compressor main shaft is extremely high and the work of the compressor is influenced by vibration after the rotating shaft is started in the background technology, the utility model provides a motor rotating shaft mounting structure for an air compressor.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a motor rotating shaft mounting structure for an air compressor comprises a shell and an impeller rotating shaft arranged in the middle of the shell, wherein an impeller is arranged at the front end of the impeller rotating shaft; a fixing nail penetrates through the assembly cylinder, the tail of the fixing nail is fixedly connected with the front end of the rotating shaft of the impeller, a fairing is arranged at the head of the fixing nail, and the fairing abuts against the front end of the impeller; the rear end of the impeller rotating shaft is provided with a vibration reduction gasket which is of a composite structure. The power core of the compressor comprises a shell and an impeller rotating shaft arranged in the middle of the shell, wherein an impeller is arranged at the front end of the impeller rotating shaft, the power core of the compressor comprises the impeller rotating shaft arranged in the shell, the impeller rotating shaft drives the impeller to rotate at a high speed, and the front end of the shell is sealed through a volute. The impeller rotating shaft is in interference connection with the impeller, the impeller rotating shaft is guaranteed to be capable of driving the impeller to rotate synchronously, the fixing nail is matched with the fairing to fix the impeller on the impeller rotating shaft in a stable pressing mode, and the rear portion of the assembling barrel is guaranteed not to be separated from the impeller rotating shaft. The vibration reduction gasket is used for obtaining better elastic property, wear resistance and high temperature resistance, and ensures that the impeller rotating shaft runs stably after being installed.

Preferably, the rear end of the impeller is provided with a connecting disc, the rotating shaft of the impeller is sleeved with the connecting disc, and the connecting disc is connected with the shell; and one side of the connecting disc, which is close to the impeller, is provided with a sealing part. The connecting disc is arranged at the rear part of the impeller and is connected to the shell as a base disc part of the impeller, and the sealing part is fixedly arranged on the connecting disc and is used for reducing the vibration influence in the rotating process of the impeller.

Furthermore, the sealing portion comprises a tooth-shaped sealing ring, the tooth-shaped sealing ring comprises a contact portion and a filling portion, teeth with front ends contacting with the rear end of the impeller are arranged on the contact portion, tooth grooves are formed among the teeth, and the filling portion is arranged on the outer edge of the contact portion. The sealing part is a tooth-shaped sealing groove, the tooth-shaped sealing ring supports the impeller to a certain degree through teeth on one hand, on the other hand, the phenomenon that the outer end face of the whole sealing ring is contacted with the impeller to generate large friction force to influence the operation of the high-speed impeller is avoided, and meanwhile, the tooth-shaped sealing ring can play a role in installing and positioning when the impeller is installed.

Preferably, the tooth socket is in spiral line distribution along the radial direction of the tooth-shaped sealing ring, a through groove is formed in the middle of the tooth-shaped sealing ring, the through groove comprises a main groove extending along the radial direction of the tooth-shaped sealing ring and a plurality of branch grooves extending along the axial direction of the tooth-shaped sealing ring, and the branch grooves extend from the bottom of the tooth groove of the tooth-shaped sealing ring to the middle of the tooth-shaped sealing ring and are communicated with the main groove. The tooth socket is different from the structure on the traditional tooth-shaped sealing ring and is distributed according to concentric circles, but is distributed from inside to outside along a spiral line structure, and the branch grooves are arranged according to tooth socket extending tracks, so that the branch grooves communicated with the main groove are distributed along the spiral line structure on the surface of the tooth-shaped sealing ring. When the impeller rotates, compressed gas flows at a high speed along the axial direction of the impeller rotating shaft, the impeller blades control airflow to flow and generate lift force far away from the impeller rotating shaft, and the airflow flows to the main groove through the branch groove, so that heat generated by rotation of the impeller can be quickly transferred to the tooth-shaped sealing ring and is radiated to the shell through good heat conductivity of the tooth-shaped sealing ring. In addition, if tooth grooves of the tooth-shaped sealing ring are distributed according to concentric circles in the structure of the traditional tooth-shaped sealing ring, the branch grooves are also distributed on the tooth-shaped sealing ring according to the concentric circles, and compressed gas generated in the stable rotation process of the impeller also flows at a high speed through branch groove passages regularly distributed in the tooth-shaped sealing ring, the process can be continuously accompanied with the whole working process of the compressor, as the airflow flow passage line is regular, once the vibration frequency generated by the tooth-shaped sealing ring is consistent with the vibration frequency of the impeller rotating shaft, a resonance phenomenon can occur, which causes great hidden danger to the motion stability of the impeller rotating shaft and the impeller in the shell, the resonance can be continuously acted until the compressor stops working, and the impeller rotating shaft can bear great resonance radial load during the period, which causes serious influence to the service life of the compressor. And the branch groove that is helical line structure and distributes can avoid compressed gas to carry out the law along concentric circles distribution mode and flow and produce resonance phenomenon, eliminates the load hidden danger that resonance leads to, improves compressor power core's life, avoids the production of scotoma.

Further, the filling part comprises a polymerization groove with an opening facing the contact part, the polymerization groove is communicated with the main groove, and the filling part and the contact part are of an integrated structure; wherein, an adsorption layer is arranged in the polymerization tank. The sealing ring is characterized in that a plurality of positioning grooves are uniformly formed in the contact part, fixing pieces fixedly connected with the connecting seat are arranged in the positioning grooves, and the positioning grooves are communicated with the main groove and used as main heat dissipation holes of the sealing ring to circulate high-speed airflow. According to the Bernoulli principle, the pressure of the outer edge of the impeller is smaller than the pressure of the inner edge of the impeller, so that when air flows to the outside in the main tank, self-correcting ring scraps, which are produced by scraping the high polymer material by the impeller to realize automatic correction of assembly precision and are not discharged out of the compressor, are collected to the polymerization tank, and are adhered and collected by the adsorption layer arranged in the polymerization tank, so that the phenomenon that the self-correcting ring scraps provide a caking core for a lubricant in the shell to cause lubricant caking to influence the lubricating effect of the shell is avoided.

Preferably, an assembly component is arranged on the outer side of the impeller, the assembly component comprises a self-correcting ring arranged at the front end of the impeller, and a volute is arranged on the outer edge of the self-correcting ring; wherein the self-aligning ring has a hardness less than that of the impeller. Self-correcting type ring is used for filling the clearance between impeller and the spiral case, prevent that the compression medium from leaking outside the cavity, adopt the better self-correcting type ring of sealed effect as the axle head sealing member, in this application, self-correcting type ring adopts macromolecular material, possess self-lubricating characteristic, when the impeller is when the start-up is experimental in advance, can scrape to self-correcting type ring, make self-correcting type ring "turning profile" according to the impeller by scraping and correcting, make self-correcting type ring according to the operating condition automatic correction of impeller, the error that produces when eliminating the compressor assembly, ensure the holistic operating stability of compressor.

Preferably, the rear end of the impeller rotating shaft is provided with a vibration reduction gasket which is of a composite structure, the vibration reduction gasket comprises an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are corrugated gaskets, and the middle layer is a graphite layer. Furthermore, micropores are arranged on the middle layer. The damping gasket is different from traditional combined type graphite metal wave form gasket, traditional combined type graphite metal wave form gasket is made by graphite paper soft layer and metal wave form gasket pressfitting, mainly used obtains better elastic property, wear resistance and high temperature resistance, and the damping gasket is made by two wave form gasket middle parts press from both sides unification graphite layers in this application, this damping gasket is except above-mentioned good performance, the noise that microporous structure on the graphite layer in the middle part still can be utilized produces impeller pivot operation process is fallen the noise and is handled, utilize the micropore on the graphite layer to transmit sound to the inside sound effect of realizing of low density graphite fast.

Preferably, the assembly cylinder comprises a front part and a rear part with the inner diameter larger than that of the front part, the front end of the impeller rotating shaft is in interference connection with the rear part, and a gap layer is arranged between the fixing nail and the front part. A gap layer is formed between the fixing nail and the front part of the assembly cylinder, so that the condition that the fixing nail and the impeller are integrally connected due to the cold welding phenomenon after the compressor is used for a long time and the disassembly cannot be realized is avoided.

Therefore, the utility model has the following beneficial effects: (1) the front end of the rotating shaft of the impeller is provided with the fixing nail and the fairing for pressing and fixing the impeller, and the vibration reduction gasket is arranged at the rear end of the rotating shaft of the impeller in a matching way, so that the vibration intensity is weakened and the stability of the machine body is improved by ensuring the stable operation of the impeller on the main shaft of the impeller in the operation process; (2) the spiral lines are distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring, the branch grooves are distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring, the vibration states of two sides of the tooth-shaped sealing ring are balanced, the vibration intensity of the tooth-shaped sealing ring on the connecting seat is reduced, and the effects of eliminating vibration and reducing noise are achieved; (3) the branch grooves distributed in the spiral line structure can avoid resonance caused by regular flow of compressed gas along a concentric circle distribution mode, eliminate load hidden danger caused by resonance, prolong the service life of a power core of the compressor and avoid dark injury; (4) the fixing nail is matched with the fairing to fix the impeller on the impeller rotating shaft in a stable pressing mode, firstly, the impeller rotating shaft is ensured not to be separated from the rear portion of the assembling barrel, secondly, a clearance layer is generated between the fixing nail and the front portion of the assembling barrel, and the phenomenon that the fixing nail and the impeller are connected integrally along with the long-term use of the compressor and then the phenomenon that the fixing nail and the impeller are cold welded is avoided, so that the situation that the impeller cannot be disassembled is caused.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

Fig. 2 is a side cross-sectional view of the tooth seal ring of fig. 1.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

In the figure: 1. the impeller comprises an impeller rotating shaft, 11, a vibration reduction gasket, 2, an impeller, 3, a self-correcting ring, 4, a fairing, 5, a fixing nail, 6, a tooth-shaped sealing ring, 61, a contact part, 62, a filling part, 63, a tooth groove, 7, a fixing part, 8, a flange, 9, a connecting disc, 10, a volute, 12, a main groove, 13, a branch groove, 14, a polymerization groove, 15 and an adsorption layer.

Detailed Description

The utility model is further described with reference to the following detailed description and accompanying drawings. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1

As shown in fig. 1, a motor rotating shaft mounting structure for an air compressor comprises a housing and an impeller rotating shaft 1 arranged in the middle of the housing, wherein an impeller 2 is arranged at the front end of the impeller rotating shaft 1, an assembly component is arranged on the outer side of the impeller 2, the assembly component comprises a self-correcting ring 3 arranged at the front end of the impeller 2, and a volute 10 is arranged on the outer edge of the self-correcting ring 3; wherein, the hardness of the self-correcting ring 3 is less than that of the impeller 2. The power core of compressor is including setting up impeller pivot 1 in the casing, impeller pivot 1 drives the high-speed rotation of impeller 2, and the casing front end is sealed through spiral case 10, from correcting the type ring and being used for filling the clearance between impeller 2 and the spiral case 10, prevent that the compression medium from leaking outward to the cavity, adopt the better from correcting the type ring of sealed effect as the axle head sealing member, in this application, from correcting the type ring and adopting macromolecular material, possess self-lubricating characteristic, when impeller 2 is when the start test in advance, can scrape to correcting the type ring from correcting, make correct the type ring from correcting by scraping according to impeller 2's "profile of rotation", make correct according to impeller 2's operating condition automatic correction from correcting the type ring, the error that produces when eliminating the compressor assembly, ensure the holistic operational stability of compressor. In the embodiment, the rotating speed of the impeller 2 is 25000 r/min, and the self-correcting ring material adopts the copolyoxymethylene, so that the density, the crystallinity, the melting point and the strength are lower, but the thermal stability is good, and the decomposition is not easy. The impeller 2 is made of 7075 aluminum alloy, is cold-processed forging alloy, and is light in weight, high in strength, compact in structure and strong in corrosion resistance. The impeller 2 can scrape the self-correcting ring to finish the assembly precision correction.

As shown in fig. 2 and 3, the rear end of the impeller 2 is provided with a connecting disc 9, the impeller rotating shaft 1 is sleeved with the connecting disc 9, and the connecting disc 9 is connected with the shell; wherein, one side of the connecting disc 9 close to the impeller 2 is provided with a sealing part. Further, the sealing portion comprises a tooth-shaped sealing ring 6, the tooth-shaped sealing ring 6 comprises a contact portion 61 and a filling portion 62, teeth with front ends contacting with the rear end of the impeller 2 are arranged on the contact portion 61, tooth grooves 63 are formed between the teeth, and the filling portion 62 is arranged on the outer edge of the contact portion 61. The tooth socket 63 is spirally distributed along the radial direction of the tooth-shaped sealing ring 6, a through groove is arranged in the middle of the tooth-shaped sealing ring 6 and comprises a main groove 12 extending along the radial direction of the tooth-shaped sealing ring 6 and a plurality of branch grooves 13 extending along the axial direction of the tooth-shaped sealing ring 6, and the branch grooves 13 extend from the bottom of the tooth socket 63 of the tooth-shaped sealing ring 6 to the middle of the tooth-shaped sealing ring 6 and are communicated with the main groove 12.

The connecting disc 9 is arranged at the rear part of the impeller 2 and is connected to the shell as a base disc part of the impeller 2, and a sealing part is fixedly arranged on the connecting disc 9 and is used for reducing the vibration influence in the rotating process of the impeller. The sealing part is a tooth-shaped sealing groove, the tooth-shaped sealing ring 6 supports the impeller 2 to a certain degree through teeth on one hand, on the other hand, the phenomenon that the outer end face of the whole sealing ring is contacted with the impeller 2 to generate large friction force to influence the operation of the high-speed impeller 2 is avoided, and meanwhile, the tooth-shaped sealing ring 6 can play a role in installation and positioning when the impeller 2 is installed. Tooth's socket 63 is different from the structure on traditional profile of tooth sealing washer 6 and distributes according to the concentric circles, but distributes from inside to outside along the helix structure, and branch groove 13 sets up according to tooth's socket 63 extension orbit, therefore the branch groove 13 that communicates with main groove 12 distributes along the helix structure on profile of tooth sealing washer 6 surface. The branch grooves 13 are distributed on a spiral line where the tooth grooves 63 are located, the spiral line is distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring 6, and the branch grooves 13 are distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring 6. The spiral line of the tooth grooves 63 is different from the traditional equal-width spiral line, but the spiral line gradually widens from inside to outside, namely the spiral line is distributed from dense to sparse along the radial direction, so that the branch grooves 13 on the inner side of the tooth-shaped sealing ring 6 are more dense than the branch grooves 13 on the outer edge. In this embodiment, the tooth-shaped seal ring 6 is made of 6061 aluminum alloy, and has good formability, weldability and machinability, so that the main groove 12 and the branch groove 13 can be conveniently formed.

When the impeller 2 rotates, compressed gas flows at a high speed along the axial direction of the impeller rotating shaft 1, the blades of the impeller 2 control the flow of air flow and generate lift force far away from the impeller rotating shaft 1, the air flow flows to the main groove 12 through the branch groove 13, heat generated by the rotation of the impeller 2 can be quickly transferred to the tooth-shaped sealing ring 6, and the heat is dissipated to the shell through the good heat conductivity of the tooth-shaped sealing ring 6. In addition, if the tooth grooves 63 of the tooth-shaped sealing ring 6 are distributed according to concentric circles in the structure of the conventional tooth-shaped sealing ring 6, the supporting grooves 13 are also distributed on the tooth-shaped sealing ring 6 according to concentric circles, and the compressed gas generated in the stable rotation process of the impeller 2 also flows at high speed in the branch groove 13 channels regularly distributed in the tooth-shaped sealing ring 6, and the process is continuously accompanied with the whole working process of the compressor, since the air flow circulation route is regular, once the vibration frequency generated by the tooth-shaped sealing ring 6 is consistent with the vibration frequency of the impeller rotating shaft 1, namely, resonance phenomenon can occur, which causes great hidden trouble to the motion stability of the impeller rotating shaft 1 and the impeller in the shell, and this resonance will continue to be active until the compressor stops, during which the impeller shaft 1 will be subjected to a very large resonant radial load, which will have a severe effect on the service life of the compressor. And the branch grooves 13 distributed in the spiral line structure can avoid the phenomenon that the compressed gas regularly flows along a concentric circle distribution mode to generate resonance, eliminate the hidden load trouble caused by resonance, prolong the service life of the power core of the compressor and avoid the hidden damage.

The filling part 62 includes a polymerization tank 14 opening toward the contact part 61, the polymerization tank 14 communicates with the main tank 12, and the filling part 62 and the contact part 61 are of an integral structure; wherein, an adsorption layer 15 is provided in the polymerization tank 14. The contact part 61 is evenly provided with a plurality of positioning grooves, the positioning grooves are internally provided with fixing pieces 7 with the tail parts fixedly connected with the connecting seat, and the positioning grooves are communicated with the main groove 12 and are used as main heat dissipation holes of the sealing ring for high-speed airflow circulation. According to the Bernoulli principle, the pressure of the outer edge of the impeller is smaller than the pressure of the inner edge of the impeller, so when air flows to the outside in the main tank 12, self-correcting ring scraps, which are generated by scraping a high polymer material by the impeller to realize automatic correction of assembly precision and are not discharged out of a compressor, are collected into the polymerization tank 14, and are adhered and collected by the adsorption layer 15 arranged in the polymerization tank 14, so that the self-correcting ring scraps are prevented from providing a caking core for a lubricant in a shell, and the lubricant caking is prevented from influencing the lubricating effect. In this embodiment, the polymerization tank 14 is a horn-shaped structure, and the opening width is smaller than the bottom width, so as to ensure that the abrasive dust will not come off after entering the polymerization tank 14. The adsorption layer 15 adopts a non-drying glue layer.

The back end of the impeller rotating shaft 1 is provided with a vibration damping gasket 11, the vibration damping gasket 11 is of a composite structure, the vibration damping gasket 11 comprises an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are corrugated gaskets, and the middle layer is a graphite layer. Furthermore, the middle layer is provided with micropores. Damping gasket 11 is different from traditional combined type graphite metal wave form gasket, traditional combined type graphite metal wave form gasket is made by graphite paper soft layer and metal wave form gasket pressfitting, mainly used obtains better elastic property, wear resistance and high temperature resistance, and damping gasket 11 is made by two wave form gasket middle parts clamp unification graphite layers in this application, this damping gasket 11 is except above-mentioned good performance, the noise that microporous structure on the graphite layer in the middle part still can be utilized produces impeller pivot 1 operation process is fallen the noise and is handled, utilize the micropore on the graphite layer to transmit sound to the inside sound effect of realizing of low density graphite fast.

The application also discloses an assembling method of the air compressor, which comprises the following steps:

s1: an impeller rotating shaft 1 is arranged in the middle of a shell, and a front end bearing and a rear end bearing are respectively arranged at two ends of the impeller rotating shaft 1;

s2: installing a vibration damping gasket 11 at the outer side of the rear end bearing, and installing a connecting seat at the outer side of the front end bearing;

s3: cutting the inner edge of the tooth-shaped sealing ring 6 along the radial direction to form a main groove 12, and then drilling along the axial direction from the bottom of the tooth groove 63 to form a branch groove 13;

s4: inserting an assembly cylinder in the middle of the impeller into the front end of the impeller rotating shaft 1 in an interference manner, and fixedly connecting a fixing nail 5 with the impeller rotating shaft 1 after penetrating through the fairing 4 and the assembly cylinder;

s5: the volute 10 is sleeved and installed on the outer edge of the connecting seat, then the self-correcting ring is installed between the impeller and the volute 10, finally the flange 8 is fixed at the outer end of the volute 10, and the flange 8 and the self-correcting ring are fixed.

The impeller middle part is provided with an assembly section of thick bamboo, and the assembly section of thick bamboo is greater than anterior rear portion including anterior and internal diameter, and 1 tip of impeller pivot is connected with the rear portion interference, and it has staple 5 to run through to have connect in the assembly section of thick bamboo, and the staple afterbody is provided with radome fairing 4 with 1 tip fixed connection of impeller pivot, radome fairing 4 butt impeller front end with the staple bolt head. Impeller pivot 1 and impeller interference are connected, guarantee that impeller pivot 1 can drive the synchronous rotation of impeller, and staple cooperation radome fairing 4 is fixed the impeller on impeller pivot 1 with the stable pressfitting of impeller, firstly ensure that assembly section of thick bamboo rear portion can not deviate from impeller pivot 1, secondly produce the clearance layer between staple 5 and assembly section of thick bamboo front portion, avoid producing "cold welding" phenomenon with the impeller along with the compressor uses for a long time after staple 5 and the connection of an organic whole, cause the unable condition of dismantling. The front end bearing and the rear end bearing ensure that the impeller rotating shaft 1 is assembled in the shell and then smoothly rotates, and the vibration reduction gasket 11 is arranged at the rear end of the impeller rotating shaft 1, so that the vibration strength of the impeller rotating shaft 1 is reduced, and a certain noise reduction performance is obtained; the connecting seat and the tooth-shaped sealing ring 6 are arranged at the front part of the impeller rotating shaft 1, the contact area between the impeller and the impeller assembly component is reduced while the impeller is supported, the influence of a friction phenomenon on the high-speed rotation of the impeller is avoided, in addition, the tooth-shaped sealing ring 6 with a special structure is matched with a polymer self-correcting ring to automatically correct the precision error generated in the assembly process of the compressor, the heat dissipation performance of the high-speed impeller is improved, the possibility of resonance between the impeller and the assembly structure is eliminated, and the power core of the compressor with excellent performance is obtained.

In addition to the above embodiments, the technical features of the present invention can be re-selected and combined to form new embodiments within the scope of the claims and the specification of the present invention, which are all realized by those skilled in the art without creative efforts, and thus, the embodiments of the present invention which are not described in detail should be regarded as the specific embodiments of the present invention and are within the protection scope of the present invention.

Claims

1. A motor rotating shaft mounting structure for an air compressor comprises a shell and an impeller rotating shaft arranged in the middle of the shell, wherein an impeller is arranged at the front end of the impeller rotating shaft; a fixing nail penetrates through the assembly cylinder, the tail of the fixing nail is fixedly connected with the front end of the rotating shaft of the impeller, a fairing is arranged at the head of the fixing nail, and the fairing abuts against the front end of the impeller; the rear end of the impeller rotating shaft is provided with a vibration reduction gasket which is of a composite structure.

2. The motor rotating shaft mounting structure for the air compressor as claimed in claim 1, wherein a connecting disc is provided inside the impeller, the rotating shaft of the impeller is sleeved with the connecting disc, and the connecting disc is connected with the housing; and one side of the connecting disc, which is close to the impeller, is provided with a sealing part.

3. The motor rotating shaft mounting structure for the air compressor as claimed in claim 2, wherein the sealing portion includes a tooth-shaped sealing ring, the tooth-shaped sealing ring includes a contact portion and a filling portion, the contact portion is provided with teeth of which front ends are in contact with the inner side of the impeller, tooth spaces are arranged between the teeth, and the tooth spaces are distributed in a spiral line along the radial direction of the tooth-shaped sealing ring; the filling part is arranged at the outer edge of the contact part.

4. The motor shaft mounting structure for the air compressor according to claim 3, wherein the middle portion of the tooth-shaped sealing ring is provided with a through groove, the through groove comprises a main groove extending along a radial direction of the tooth-shaped sealing ring and a plurality of branch grooves extending along an axial direction of the tooth-shaped sealing ring, and the branch grooves extend from a bottom portion of the tooth-shaped sealing ring to the middle portion of the tooth-shaped sealing ring and are communicated with the main groove.

5. The motor shaft mounting structure for the air compressor as claimed in claim 3, wherein the filling portion includes a polymerization groove opened toward the contact portion, the polymerization groove communicates with the main groove, and the filling portion and the contact portion are of an integrated structure; wherein, an adsorption layer is arranged in the polymerization tank.

6. The motor rotating shaft mounting structure for the air compressor as claimed in claim 1, wherein an assembly member is provided at an outer side of the impeller, the assembly member includes a self-aligning ring provided at a front end of the impeller, and a volute is provided at an outer edge of the self-aligning ring; wherein the self-aligning ring has a hardness less than that of the impeller.

7. The structure of any one of claims 1 to 6, wherein the vibration-damping gasket comprises an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are corrugated gaskets, and the middle layer is a graphite layer.

8. The structure of claim 7, wherein the upper and lower layers are respectively bonded to the two sides of the middle layer, and the middle layer has micro holes.

9. The motor rotating shaft mounting structure for the air compressor as claimed in any one of claims 1 to 6, wherein the assembling cylinder includes a front portion and a rear portion having an inner diameter greater than that of the front portion, the front end of the impeller rotating shaft is in interference connection with the rear portion, and a gap layer is provided between the fixing nail and the front portion.