CN113513499A - Assembly precision is from correcting formula compressor - Google Patents
Assembly precision is from correcting formula compressor Download PDFInfo
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- CN113513499A CN113513499A CN202110749670.3A CN202110749670A CN113513499A CN 113513499 A CN113513499 A CN 113513499A CN 202110749670 A CN202110749670 A CN 202110749670A CN 113513499 A CN113513499 A CN 113513499A
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- impeller
- tooth
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- rotating shaft
- correcting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an assembly precision self-correcting 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-aligning ring has a hardness less than that of the impeller. From type ring of correcting adopts macromolecular material, possesses self-lubricating characteristic, when the impeller is when starting test in advance, can scrape from type ring of correcting for "turning profile" according to the impeller is scraped and is corrected from type ring of correcting, makes from type ring of correcting automatically according to the operating condition of impeller correct, eliminates the error that produces during the compressor assembly, ensures the holistic operating stability of compressor.
Description
Technical Field
The invention relates to the technical field of production and manufacturing of compressors, in particular to a self-correcting compressor with assembly precision.
Background
The rotor is a core component of a centrifugal compressor, which not only affects the aerodynamic performance of the compressor, but also is an important factor affecting the rotordynamic characteristics of the compressor. The first-stage impeller of the single-shaft cantilever type centrifugal air compressor is in a cantilever form, and the impeller is connected with the main shaft and driven by the prime motor to do work.
The existing connection mode of the impeller and the main shaft is flange connection, the impeller is tightly fastened with the pinion shaft through bolts, so that the contact surface of the impeller and the flange of the pinion shaft generates friction force in the running process, and the force is used for avoiding the relative displacement of the two flanges possibly generated in the running process. This connection has the following disadvantages:
(1) the installation degree of difficulty is big, and the assembly precision is lower.
(2) The flange end face is easy to grind in the installation process, and damage is caused to the rotor.
(3) After the installation, in the operation process, relative displacement easily takes place for impeller and flange, increases the rotor uneven volume, is unfavorable for steady operation.
The above three points are important factors influencing the stable operation of the rotor.
For example, chinese patent document (publication No. CN 107178521A) discloses "a single-shaft centrifugal compressor rotor and an assembling method thereof", which includes a main shaft having a tapered shaft head, and an impeller fitted to the shaft head; the invention also discloses an assembly method of the single-shaft centrifugal compressor rotor, and the rotor structure of the single-shaft centrifugal compressor assembled by the assembly method has the characteristics of simple assembly process, high assembly precision, large transmission torque, no relative displacement and the like.
Although the technical scheme can improve the stability of the rotor in operation to a certain extent and reduce the amplitude of rotor vibration in the operation process, when the rotating speed of the compressor reaches over 20000 revolutions, the assembly precision requirement of the power core of the compressor is extremely high, 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 machine is scrapped, and the consequence is very serious.
Disclosure of Invention
Aiming at the problems that the assembly requirement of a high-speed compressor is extremely high and blades can be damaged due to vibration after a rotating shaft is started, the invention provides the self-correcting compressor with the assembly precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
the assembly precision self-correcting 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, 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. The power core of compressor is including setting up the impeller pivot in the casing, the impeller pivot drives the high-speed rotation of impeller, and the casing front end passes through the spiral case and seals, the type ring of correcting certainly is used for filling the clearance between impeller and the spiral case, prevent that the compression medium from leaking outward to the cavity, adopt the better type ring of correcting certainly of sealed effect as axle head sealing member, in this application, the type ring of correcting certainly adopts macromolecular material, possess self-lubricating characteristic, when the impeller is when the start test in advance, can scrape the type ring of correcting certainly, make the type ring of correcting certainly correct according to the "profile of rotation" of impeller by scraping, make the type ring of correcting certainly correct according to the operating condition automatic correction of impeller, the error that produces when eliminating the compressor assembly, ensure the holistic operational stability of compressor.
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.
Preferably, the branch grooves are distributed on a spiral line where the tooth grooves are located, the spiral line is distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring, and the branch grooves are distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring. The spiral line where the tooth grooves are located 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 on the inner side of the tooth-shaped sealing ring are more dense than the branch grooves on the outer edge. The flow velocity is increased by the narrow branch groove after the air flow enters from the inner branch groove on the tooth-shaped sealing ring, the air flow flows from inside to outside along the radial direction after entering the main groove and leaves the tooth-shaped sealing ring from the outer branch groove, and the vibration caused when the air flow leaves the branch groove is larger than the vibration caused when the air flow enters the branch groove due to the increase of the flow velocity. Therefore, if the supporting grooves of the outer ring reach a certain number, the vibration states of the inner ring and the outer ring of the tooth-shaped sealing ring are uneven, which greatly affects the stability of the sealing ring, so that the supporting grooves of the inner ring are dense in the supporting grooves of the outer ring to balance the vibration stability of the two sides. Furthermore, the supporting grooves are distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring, namely, the inner supporting grooves are further more than the outer supporting grooves, so that the vibration states of two sides can be further 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.
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, 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 impeller middle part is provided with an assembly cylinder, the assembly cylinder comprises a front part and a rear part with an inner diameter larger than the front part, the end part of the impeller rotating shaft is in interference connection with the rear part, a fixing nail penetrates through the assembly cylinder, the tail part of the fixing nail is fixedly connected with the end part of the impeller rotating shaft, the head part of the fixing nail is provided with a fairing, and the fairing abuts against the front end of the impeller. 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, firstly, the impeller rotating shaft is guaranteed not to be separated from the rear portion of the assembling barrel, secondly, a gap layer is generated between the fixing nail and the front portion of the assembling barrel, and the situation that the fixing nail and the impeller are connected integrally to cause incapability of disassembly due to the fact that the fixing nail and the impeller are connected integrally after the compressor is used for a long time is avoided.
The application also discloses an assembling method of the self-correcting compressor with the assembling precision, which comprises the following steps:
s1: installing an impeller rotating shaft in the middle of the shell, and respectively installing a front end bearing and a rear end bearing at two ends of the impeller rotating shaft;
s2: installing a vibration damping gasket outside the rear end bearing, and installing a connecting seat outside the front end bearing;
s3: cutting the inner edge of the tooth-shaped sealing ring along the radial direction to form a main groove, and then drilling the groove bottom of the tooth groove along the axial direction to form a branch groove;
s4: inserting an assembling cylinder in the middle of the impeller into the front end of an impeller rotating shaft in an interference manner, and fixedly connecting a fixing nail to the impeller rotating shaft after penetrating through the fairing and the assembling cylinder;
s5: the volute 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, and finally the flange is fixed at the outer end of the volute and fixed with the self-correcting ring.
The front end bearing and the rear end bearing ensure that the impeller rotating shaft smoothly rotates after being assembled in the shell, and the vibration reduction gasket is arranged at the rear end of the impeller rotating shaft, so that the vibration intensity of the impeller rotating shaft is reduced and a certain noise reduction performance is obtained; the connecting seat and the tooth-shaped sealing ring are arranged at the front part of the rotating shaft of the impeller, the contact area between the impeller and the impeller assembly component is reduced while the impeller is supported, the influence of the friction phenomenon on the high-speed rotation of the impeller is avoided, in addition, the tooth-shaped sealing ring with a special structure is matched with the macromolecule 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.
Therefore, the invention has the following beneficial effects: (1) the self-correcting ring is made of high polymer materials and has self-lubricating property, and when the impeller is subjected to a pre-starting test, the self-correcting ring can be scraped, so that the self-correcting ring is scraped and corrected according to the 'rotating profile' of the impeller, the self-correcting ring is automatically corrected according to the working state of the impeller, errors generated during assembly of the compressor are eliminated, and the overall operation stability of the compressor is ensured; (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 schematic structural view of the tooth-shaped sealing ring in fig. 1.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
Fig. 4 is a front view of the tooth seal ring of fig. 1.
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 invention 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 invention and are not to be construed as limiting the invention.
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, the assembly precision self-correcting 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.
As shown in fig. 4, a connection plate 9 is provided at the rear of the impeller 2, and is connected to the casing as a base plate portion of the impeller 2, and a seal portion for reducing the influence of vibration during rotation of the blade is fixedly attached to the connection plate 9. 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.
After the air flow enters from the inner ring branch groove 13 on the tooth-shaped sealing ring 6, the flow velocity is increased by the narrow branch groove 13, the air flow enters the main groove 12 and then flows from inside to outside along the radial direction, and leaves the tooth-shaped sealing ring 6 from the outer ring branch groove 13, and the vibration caused when the air flow leaves the branch groove 13 is larger than the vibration caused when the air flow enters the branch groove 13 due to the increase of the flow velocity. Therefore, if the number of the supporting grooves 13 close to the outer ring reaches a certain number, the vibration states of the inner ring and the outer ring of the tooth-shaped sealing ring 6 are uneven, which greatly affects the stability of the sealing ring, so that the vibration stability of both sides can be balanced only when the supporting grooves 13 of the inner ring are dense in the supporting grooves 13 of the outer ring. Furthermore, the branch grooves 13 are distributed from dense to sparse along the radial direction of the tooth-shaped sealing ring 6, namely the inner branch grooves 13 are further more than the outer branch grooves 13, so that the vibration states of two sides can be further balanced, the vibration intensity of the tooth-shaped sealing ring 6 on the connecting seat is reduced, and the effects of eliminating vibration and reducing noise are achieved.
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 self-correcting compressor with the assembling precision, 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 (10)
1. The assembly precision self-correcting 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; wherein the self-aligning ring has a hardness less than that of the impeller.
2. The compressor with the self-correcting assembly precision as recited in claim 1, wherein a connecting disc is arranged at the rear end of the impeller, 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.
3. The compressor of claim 2, wherein the sealing portion comprises a tooth-shaped sealing ring, the tooth-shaped sealing ring comprises a contact portion and a filling portion, the contact portion is provided with teeth of which the front ends are in contact with the rear end of the impeller, and tooth grooves are formed between the teeth; the filling part is arranged at the outer edge of the contact part.
4. The compressor of claim 3, wherein the tooth grooves are distributed in a spiral line along a 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.
5. The compressor as claimed in claim 4, wherein the grooves are distributed on a spiral line where the tooth grooves are located, the spiral line is distributed from dense to sparse along the radial direction of the tooth-shaped seal ring, and the grooves are distributed from dense to sparse along the radial direction of the tooth-shaped seal ring.
6. The self-correcting compressor with the assembling accuracy according to claim 3, wherein the filling part comprises a polymerization groove which is opened towards 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.
7. The compressor as claimed in any one of claims 1 to 6, wherein a vibration-damping washer is provided at the rear end of the rotating shaft of the impeller, the vibration-damping washer is of a composite structure and comprises an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are corrugated washers, and the middle layer is a graphite layer.
8. The self-correcting compressor for assembly accuracy according to claim 7, wherein the middle layer is provided with micro holes.
9. The compressor as claimed in any one of claims 1 to 6, wherein an assembly barrel is disposed in the middle of the impeller, the assembly barrel includes a front portion and a rear portion having a larger inner diameter than the front portion, the end portion of the rotating shaft of the impeller is in interference fit with the rear portion, a fixing nail is inserted through the assembly barrel, the tail portion of the fixing nail is fixedly connected with the end portion of the rotating shaft of the impeller, a fairing is disposed on the end portion of the fixing nail, and the fairing abuts against the front end of the impeller.
10. A method of assembling a self-correcting compressor according to any one of claims 1 to 9, comprising the steps of:
s1: installing an impeller rotating shaft in the middle of the shell, and respectively installing a front end bearing and a rear end bearing at two ends of the impeller rotating shaft;
s2: installing a vibration damping gasket outside the rear end bearing, and installing a connecting seat outside the front end bearing;
s3: cutting the inner edge of the tooth-shaped sealing ring along the radial direction to form a main groove, and then drilling the groove bottom of the tooth groove along the axial direction to form a branch groove;
s4: inserting an assembling cylinder in the middle of the impeller into the front end of an impeller rotating shaft in an interference manner, and fixedly connecting a fixing nail to the impeller rotating shaft after penetrating through the fairing and the assembling cylinder;
s5: the volute is sleeved on the outer edge of the connecting seat, the ring is installed between the impeller and the volute, and finally the flange is fixed at the outer end of the volute and fixed with the ring.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110749670.3A CN113513499B (en) | 2021-07-02 | 2021-07-02 | Assembly precision is from correcting formula compressor |
| PCT/CN2021/140647 WO2023273232A1 (en) | 2021-07-02 | 2021-12-23 | Assembly accuracy self-correcting compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110749670.3A CN113513499B (en) | 2021-07-02 | 2021-07-02 | Assembly precision is from correcting formula compressor |
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| CN113513499B CN113513499B (en) | 2022-04-26 |
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Cited By (1)
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| WO2023273232A1 (en) * | 2021-07-02 | 2023-01-05 | 鑫磊压缩机股份有限公司 | Assembly accuracy self-correcting compressor |
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| CN113513499B (en) | 2022-04-26 |
| WO2023273232A1 (en) | 2023-01-05 |
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