CN109909433B - Machining tool and machining method for centrifugal compressor - Google Patents
Machining tool and machining method for centrifugal compressor Download PDFInfo
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- CN109909433B CN109909433B CN201910252958.2A CN201910252958A CN109909433B CN 109909433 B CN109909433 B CN 109909433B CN 201910252958 A CN201910252958 A CN 201910252958A CN 109909433 B CN109909433 B CN 109909433B
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Abstract
The invention discloses a processing tool and a processing method of a centrifugal compressor, which comprise a mandrel, a first pressure plate, a second pressure plate and a compression nut; the first pressure plate is coaxially and fixedly arranged on the mandrel in a relative position and is arranged close to the end part of the mandrel, and a first positioning hole and a first riveting through hole for fixing the casing are formed in the first pressure plate; a second through hole is formed in the axis position of the second pressure plate, the second through hole is sleeved on the mandrel in a sliding mode, second riveting through holes which correspond to the positions of the pre-processed riveting holes of the diffuser in a one-to-one mode are formed in the second pressure plate, and the positions of the second riveting through holes correspond to the positions of the first riveting through holes in a one-to-one mode; and the compression nut is in threaded fit with the mandrel and is used for pressing the second pressure plate to the first pressure plate. The processing tool avoids the problem that riveting holes are not aligned and cannot be installed, and then the yield of riveting installation is improved.
Description
Technical Field
The invention relates to the technical field of centrifugal compressors, in particular to a machining tool and a machining method of a centrifugal compressor.
Background
The centrifugal compressor is an important component of the turbocharger, and is widely applied due to high single-stage supercharging ratio and simple structure. The compressor casing and the diffuser are important parts of the centrifugal compressor, so the performance of the centrifugal compressor is directly influenced by the performance of the compressor casing and the diffuser. The compressor casing is internally provided with a rotating impeller, and higher requirements are put forward on the coaxiality of the compressor casing and the diffuser.
The processing and manufacturing process of the existing centrifugal compressor mainly adopts a mode of separate processing and reassembly, the coaxiality of a casing and a diffuser of the compressor is difficult to guarantee by the processing mode, and the impeller is easy to rub with the casing after being installed; and the riveting holes of the compressor casing and the diffuser are not aligned and riveted easily in a separate processing and assembling mode. Therefore, the existing processing mode generally has the problems that the processing precision is not easy to guarantee and the yield is low. And a certain processing tool is required to be designed to reduce errors and improve the precision and the yield.
In summary, how to solve the problems that the machining precision of the centrifugal compressor is not easy to be ensured and the yield is low has become a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a machining tool and a machining method for a centrifugal compressor, and solves the problems that the machining precision of the centrifugal compressor is not easy to guarantee and the yield is low.
In order to achieve the purpose, the invention provides a machining tool of a centrifugal compressor, which comprises a mandrel, a first pressing plate, a second pressing plate and a compression nut, wherein the mandrel is arranged on the first pressing plate;
the first pressure plate is coaxially and fixedly arranged on the mandrel in a relative position and is arranged close to the end part of the mandrel, and a first positioning hole and a first riveting through hole for fixing a casing of the centrifugal compressor are formed in the first pressure plate;
a second through hole is formed in the axis position of the second pressure plate, the second through hole is sleeved on the mandrel in a sliding mode, second riveting through holes which correspond to the positions of the pre-processed riveting holes of the diffuser of the centrifugal compressor in a one-to-one mode are formed in the second pressure plate, and the positions of the second riveting through holes correspond to the positions of the first riveting through holes in a one-to-one mode;
the compression nut is in threaded fit with the mandrel, and the compression nut is used for pressing the second pressure plate to the first pressure plate.
Preferably, the first pressure plate and the mandrel are of an integrally formed structure.
Preferably, the first pressure plate and the mandrel are of a split structure, a first through hole is formed in the axis position of the first pressure plate, and the first through hole is fixedly sleeved on the mandrel.
Preferably, the dabber is the step shaft, the step shaft include with the big footpath section of the well through-hole looks adaptation of machine casket and with the path section of the well through-hole looks adaptation of diffuser, first pressure disk is located on the big footpath section, connect big footpath section with the interaxial being used for of path section with the one end of the well through-hole of diffuser offsets, the second pressure disk be used for with the other end of the well through-hole of diffuser offsets.
Preferably, the first pressure plate is further provided with an ejection hole for detaching the casing.
Preferably, the ejection holes are plural in number and are uniformly arranged in the circumferential direction of the first platen.
Preferably, a threaded fixing hole matched with the fixed end of the lathe is formed in the end face of one end of the mandrel, and a top mounting hole matched with the top end of the lathe is formed in the end face of the other end of the mandrel.
Preferably, still cover on the dabber and be equipped with spring washer and flat pad, spring washer with flat pad all is located the second pressure disk with between the gland nut, just flat pad sets up spring washer with between the gland nut.
Preferably, the second platen is slidable only in the axial direction of the spindle.
Compared with the introduction content of the background technology, the processing tool of the centrifugal compressor comprises a mandrel, a first pressing plate, a second pressing plate and a compression nut; the first pressure plate is coaxially and fixedly arranged on the mandrel in a relative position and is arranged close to the end part of the mandrel, and a first positioning hole and a first riveting through hole for fixing the casing are formed in the first pressure plate; a second through hole is formed in the axis position of the second pressure plate, the second through hole is sleeved on the mandrel in a sliding mode, second riveting through holes which correspond to the positions of the pre-processed riveting holes of the diffuser in a one-to-one mode are formed in the second pressure plate, and the positions of the second riveting through holes correspond to the positions of the first riveting through holes in a one-to-one mode; and the compression nut is in threaded fit with the mandrel and is used for pressing the second pressure plate to the first pressure plate. The processing tool fixes a casing of a centrifugal compressor through a first positioning hole on a first pressure plate, a diffuser and a second pressure plate are sequentially sleeved from one end of a mandrel away from the first pressure plate, and a first riveting through hole is opposite to a second riveting through hole, then the second pressure plate is pressed towards the first pressure plate through a pressing nut, so that the casing is matched and attached to the diffuser, because the first riveting through hole on the first pressure plate and the second riveting through hole on the second pressure plate are in one-to-one correspondence, a punching tool can punch the corresponding position of the casing through the second riveting through hole and a riveting hole pre-processed on a blade of the diffuser, and because the casing is punched through the riveting hole pre-processed on the blade of the diffuser during punching, the matching degree of the positions of the riveting hole processed on the casing and the riveting hole pre-processed on the diffuser is better, the problem of riveting the hole pair unaligned unable installation has been avoided, has improved the yield of riveting installation then, simultaneously because first pressure disk and second pressure disk all arrange with the dabber is coaxial, consequently can guarantee the axiality of first pressure disk and second pressure disk, also guaranteed the axiality between well through-hole on the machine casket and the well through-hole on the diffuser, then make the machining precision guarantee more easily.
In addition, the invention also provides a processing method of the centrifugal compressor, the processing method adopts the processing tool of the centrifugal compressor described in any scheme, and the processing method comprises the following steps:
step S1: sleeving a casing of the centrifugal compressor into a mandrel from one end, far away from a first pressure plate, of the mandrel, and fixing the casing on the first pressure plate through a first positioning hole;
step S2: a diffuser and a second pressure plate are sleeved in sequence from one end of the mandrel, which is far away from the first pressure plate;
step S3: screwing a compression nut into one end of the mandrel, which is far away from the first pressure plate, pressing the diffuser on the matching end surface of the casing by rotating the compression nut, and enabling the first riveting through hole to be opposite to the second riveting through hole when the compression nut rotates to the position;
step S4: drilling a riveting hole to be machined of the casing through a riveting hole which is pre-machined in the blade of the diffuser and penetrates through the second riveting through hole by using a drilling tool;
step S5: riveting operation is carried out on the riveting hole in the diffuser and the riveting hole in the casing through riveting equipment to obtain a riveted centrifugal compressor;
step S6: and sequentially taking down the compression nut, the second pressure plate and the riveted centrifugal compressor.
Because the processing method adopts the processing tool of the centrifugal compressor and the processing tool has the technical effect, the processing method also has the corresponding technical effect, and the details are not repeated herein.
Drawings
Fig. 1 is a schematic overall cross-sectional structural view of a machining tool for a centrifugal compressor according to an embodiment of the present invention;
FIG. 2 is a left side view of the structure of FIG. 1;
fig. 3 is a schematic cross-sectional structural diagram of a casing of a centrifugal compressor according to an embodiment of the present invention;
FIG. 4 is a left side view of the structure of FIG. 3;
FIG. 5 is a schematic cross-sectional view of a diffuser of a centrifugal compressor according to an embodiment of the present invention;
fig. 6 is a left side view of the structure of fig. 5.
In the above figures 1-6 of the drawings,
the riveting device comprises a mandrel 1, a large-diameter section 11, a small-diameter section 12, a thread fixing hole 13, a top mounting hole 14, a shaft shoulder 15, a first pressure plate 2, a first positioning hole 21, a first riveting through hole 22, a top ejecting hole 23, a second pressure plate 3, a second riveting through hole 31, a gland nut 4, a casing 5, a middle through hole 50 of the casing, a second positioning hole 51, a diffuser 6, a middle through hole 60 of the diffuser, a pre-processed riveting hole 61, a spring washer 7 and a flat gasket 8.
Detailed Description
The core of the invention is to provide a processing tool and a processing method of a centrifugal compressor, which solve the problems that the processing precision of the centrifugal compressor is not easy to guarantee and the yield is low.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 6, a machining tool for a centrifugal compressor according to an embodiment of the present invention includes a mandrel 1, a first platen 2, a second platen 3, and a compression nut 4; the first pressure plate 2 is coaxially and fixedly arranged on the mandrel 1 in a relative position and is arranged close to the end part of the mandrel 1, and the first pressure plate 2 is provided with a first positioning hole 21 and a first riveting through hole 22 for fixing a casing 5 of the centrifugal compressor; a second through hole is formed in the axis position of the second pressure plate 3, the second through hole is slidably sleeved on the mandrel 1, second riveting through holes 31 which correspond to the positions of the pre-processed riveting holes 61 of the diffuser 6 of the centrifugal compressor one by one are formed in the second pressure plate 3, and the positions of the second riveting through holes 31 correspond to the positions of the first riveting through holes 22 one by one; the compression nut 4 is in threaded fit with the mandrel 1, and the compression nut 4 is used to press the second pressure plate 3 towards the first pressure plate 2.
According to the processing tool of the centrifugal compressor, in the actual use process, the casing of the centrifugal compressor is fixed through the first positioning hole in the first pressure plate, the diffuser and the second pressure plate are sequentially sleeved from one end, far away from the first pressure plate, of the mandrel, the first riveting through hole is required to be opposite to the second riveting through hole, then the second pressure plate is pressed towards the first pressure plate through the pressing nut, the casing is matched and attached to the diffuser, the positions of the first riveting through hole in the first pressure plate and the second riveting through hole in the second pressure plate are in one-to-one correspondence, therefore, a punching tool can punch holes in the corresponding positions of the casing through the second riveting through hole and the riveting hole which is processed in advance in the blade of the diffuser sequentially, and the positions of the riveting hole which is processed in advance in the blade of the diffuser are punched during punching, so that the matching degree of the positions of the riveting hole which is processed in the casing and the riveting hole which is processed in advance in the diffuser is matched with the position The problem that riveting holes are not aligned and cannot be installed is solved, the yield of riveting installation is improved, and meanwhile, due to the fact that the first pressure plate and the second pressure plate are arranged coaxially with the core shaft, the coaxiality of the first pressure plate and the second pressure plate can be guaranteed, the coaxiality between the middle through hole in the casing and the middle through hole in the diffuser is guaranteed, and machining accuracy is guaranteed easily.
It should be noted that, an integrally formed structure may be provided between the first pressure plate 2 and the mandrel 1, or a split structure may be provided, for example, a first through hole is provided at the axis position of the first pressure plate 2, the first through hole is fixedly sleeved on the mandrel 1, and the fixing mode may be a key connection or a welding mode, etc. In the practical application process, the selection can be carried out according to the practical requirements.
It should be noted that, as will be understood by those skilled in the art, after the central through hole 50 of the casing 5 and the central through hole 60 of the diffuser 6 of the centrifugal compressor are inserted into the mandrel 1, the central through hole and the central through hole should be matched with the mandrel, so as to ensure the coaxiality of the casing and the diffuser, and then ensure the machining precision of the casing and the diffuser and the matching precision after machining. The number of the first riveting through hole 22 and the second riveting through hole 31 is specifically selected according to a riveting tool required to be used for riveting corresponding to the structural form of the compressor, for example, for a certain type of compressor, 13 holes with the diameter of 16mm can be adopted for the first riveting through hole and the second riveting through hole, and the first riveting through hole and the second riveting through hole are used for penetrating a riveting gun and a top iron in actual use.
In a further embodiment, the spindle 1 is preferably a stepped shaft, the stepped shaft includes a large diameter section 11 adapted to the middle through hole 50 of the casing 5 and a small diameter section 12 adapted to the middle through hole 60 of the diffuser 6, the first pressure plate 2 is located on the large diameter section 11, a shoulder 15 connecting the large diameter section 11 and the small diameter section 12 is used for abutting against one end of the middle through hole 60 of the diffuser 6, and the second pressure plate 3 is used for abutting against the other end of the middle through hole 60 of the diffuser 6. Through designing into the structural style of step shaft with dabber 1 for it is more convenient that casing and diffuser match with the dabber respectively, and offset with the terminal surface of shaft shoulder and second pressure disk respectively through the both ends face with the well through-hole of diffuser, make gland nut at the precession in-process, avoid diffuser and casing direct production too big extrusion force and the condition of damaging to take place.
It should be noted that, as will be understood by those skilled in the art, the specific size of the large-diameter section of the machining mandrel 1 is determined by the size of the through hole in the casing 5 and the size of the through hole in the diffuser 6 of the actual centrifugal compressor; the end surface of the mandrel 1 is provided with a thread fixing hole and a top mounting hole which are matched with corresponding lathe standard parts; and the first positioning hole 21 on the first pressure plate should be sized with the corresponding second positioning hole 51 on the casing 5, and the first positioning hole 21 and the second positioning hole 51 are fixedly connected by bolts. It should be noted that the length of the large-diameter section (excluding the portion occupied by the first pressure plate) should be adapted to the thickness of the front section of the compressor (i.e. the length of the through hole in the casing); the length of the small diameter section is slightly longer than the sum of the length of the through hole in the diffuser and the thickness of the second pressure plate, and the extra part is used for adapting parts such as a spring washer, a compression nut and the like. For example, in the invention, for a certain type of centrifugal compressor, the diameter of the large-diameter section is 32mm, the diameter of the small-diameter section is 30mm, and the large-diameter section and the small-diameter section are both finish machined and are matched with the inner diameters of a casing and a diffuser of the compressor. The threaded fixing hole on the front end face of the mandrel is matched with a standard M6 countersunk screw, and the top mounting hole on the rear end face of the mandrel is matched with an M6 countersunk screw (the depth is 8 mm).
In a further embodiment, in order to facilitate the convenient and fast disassembly from the mandrel after the drilling and integral riveting assembly of the casing, the first pressure plate 2 is further provided with an ejection hole 23 for disassembling the casing 5. Through the design of the ejection hole, the processed compressor can be ejected out easily through the wedge.
Here, the number of the ejection holes 23 may be one or more. The embodiment of the invention preferably adopts a mode of arranging a plurality of ejection holes and evenly arranging the ejection holes along the circumferential direction of the first pressure plate, so that when the processed part is ejected through the ejection holes, the ejection holes along the circumferential direction can be ejected step by step, thereby avoiding the generation of shear stress and ensuring that the ejection holes eject the part smoothly.
It should be understood by those skilled in the art that the machining tool needs to fix the mandrel during use, and generally, the mandrel is fixedly machined by being mounted on a lathe, and is conveniently fixed on the lathe, a threaded fixing hole 13 adapted to a fixed end of the lathe is formed in an end face of one end of the mandrel 1, and a top mounting hole 14 adapted to a tip end of the lathe is formed in an end face of the other end of the mandrel 1. It is understood that the above-mentioned fixing manner by using a lathe is only a preferred example of the embodiment of the present invention, and other fixing manners commonly used by those skilled in the art may also be used in the practical application, such as a manner that a sleeve flange is matched with a positioning pin arranged perpendicular to the sleeve flange to position and fix a mandrel, and the like.
In some more specific embodiments, in order to prevent the second pressure plate from loosening after being pressed and maintain a certain pre-tightening force, a spring washer 7 is further sleeved on the mandrel 1, and the spring washer 7 is located between the second pressure plate 3 and the pressing nut 4. The locking force of the compression nut can be always kept to be a certain pretightening force through the action of the spring washer, and the loosening condition is avoided.
Furthermore, in order to ensure the service life of the compression nut and at the same time to increase the effective pressure end face, a flat washer 8 is arranged between the spring washer 7 and the compression nut 4.
In addition, in order to promote the location convenience that the processing frock use is, practice thrift the position adjustment time of second pressure disk, this second pressure disk 2 is preferred to be only can to slide along the axial direction of dabber 1, can make second pressure disk itself assemble to the spindle time like this, has just guaranteed the position one-to-one of second for riveting perforating hole and first for riveting perforating hole, has all need the loaded down with trivial details operation of regulation when having avoided using at every turn. In an actual manner, the part of the mandrel, which is correspondingly sleeved with the second pressure plate, is designed into a mandrel structure with a transverse cutting notch, and the second through hole of the second pressure plate corresponds to the cross section shape of the mandrel at the position, so that the second pressure plate can be limited to rotate on the mandrel after being assembled, and can only slide along the axial direction. It is understood that the above implementation manner is only a preferred example of the embodiment of the present invention, and in the practical application process, other structural forms that are commonly used by those skilled in the art may also be used, for example, a protruding key structure is provided on the inner wall of the second through hole corresponding to the second pressure plate, and a key groove is designed on the mandrel at a position corresponding to the key structure, so as to achieve the purpose of limiting rotation.
In addition, the invention also provides a processing method of the centrifugal compressor, the processing method adopts the processing tool of the centrifugal compressor described in any scheme, and the processing method specifically comprises the following steps:
step S1: sleeving a casing 5 of the centrifugal compressor into the mandrel 1 from one end, far away from the first pressure plate 2, of the mandrel 1, and fixing the casing 5 on the first pressure plate 2 through a first positioning hole 21;
step S2: a diffuser 6 and a second pressure plate 3 are sleeved in sequence from one end of the mandrel 1 far away from the first pressure plate 2;
step S3: a compression nut 4 is screwed in from one end of the mandrel 1 far away from the first pressure plate 2, the diffuser 6 is tightly pressed on the matching end surface of the casing 5 by rotating the compression nut 4, and when the compression nut 4 rotates to a position, the first riveting through hole 22 is opposite to the second riveting through hole 31;
step S4: drilling a riveting hole to be machined of the casing 5 through a punching tool which penetrates through the second riveting through hole 31 and passes through a riveting hole 61 which is machined in advance in the blade of the diffuser 6;
step S5: riveting operation is carried out on the riveting hole 61 on the diffuser 6 and the riveting hole on the casing 5 through riveting equipment to obtain a riveted centrifugal compressor;
step S6: and sequentially taking down the compression nut 4, the second pressure plate 3 and the riveted centrifugal compressor.
The details of the processing tool and the processing method of the centrifugal compressor provided by the invention are described above. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The machining tool for the centrifugal compressor is characterized by comprising a mandrel (1), a first pressing plate (2), a second pressing plate (3) and a compression nut (4);
the first pressure plate (2) is coaxially and fixedly arranged on the mandrel (1) in a relative position and is arranged close to the end part of the mandrel (1), and a first positioning hole (21) and a first riveting through hole (22) for fixing a casing (5) of the centrifugal compressor are arranged on the first pressure plate (2);
a second through hole is formed in the axis position of the second pressure plate (3), the second through hole is sleeved on the mandrel (1) in a sliding mode, second riveting through holes (31) which correspond to the positions of the pre-processed riveting holes (61) of the diffuser (6) of the centrifugal compressor one by one are formed in the second pressure plate (3), and the positions of the second riveting through holes (31) correspond to the positions of the first riveting through holes (22) one by one;
and the compression nut (4) is in threaded fit with the mandrel (1), and the compression nut (4) is used for pressing the second pressure plate (3) to the first pressure plate (2).
2. The machining tool for the centrifugal compressor according to claim 1, wherein the first pressure plate (2) and the mandrel (1) are of an integrally formed structure.
3. The machining tool for the centrifugal compressor according to claim 1, wherein the first pressure plate (2) and the mandrel (1) are of a split structure, a first through hole is formed in the axis position of the first pressure plate (2), and the first through hole is fixedly sleeved on the mandrel (1).
4. The machining tool for the centrifugal compressor according to any one of claims 1 to 3, wherein the mandrel (1) is a stepped shaft, the stepped shaft comprises a large-diameter section (11) adapted to a middle through hole (50) of the casing (5) and a small-diameter section (12) adapted to a middle through hole (60) of the diffuser (6), the first pressure plate (2) is located on the large-diameter section (11), a shaft shoulder (15) connecting the large-diameter section (11) and the small-diameter section (12) is used for abutting against one end of the middle through hole (60) of the diffuser (6), and the second pressure plate (3) is used for abutting against the other end of the middle through hole (60) of the diffuser (6).
5. The tooling for machining a centrifugal compressor according to claim 1, characterized in that the first pressure plate (2) is further provided with an ejection hole (23) for detaching the casing (5).
6. The tooling for machining the centrifugal compressor according to claim 5, wherein the number of the ejection holes (23) is multiple and is uniformly arranged along the circumferential direction of the first pressure plate (2).
7. The machining tool for the centrifugal compressor according to claim 1, wherein a threaded fixing hole (13) matched with the fixed end of a lathe is formed in the end face of one end of the mandrel (1), and a jacking hole (14) matched with the top end of the lathe is formed in the end face of the other end of the mandrel (1).
8. The machining tool for the centrifugal compressor according to claim 1, wherein a spring washer (7) and a flat gasket (8) are further sleeved on the mandrel (1), the spring washer (7) and the flat gasket (8) are located between the second pressing plate (3) and the compression nut (4), and the flat gasket (8) is arranged between the spring washer (7) and the compression nut (4).
9. The machining tool for the centrifugal compressor according to claim 1, characterized in that the second pressure plate (3) can only slide in the axial direction of the mandrel (1).
10. A machining method of a centrifugal compressor, characterized in that the machining method adopts the machining tool of the centrifugal compressor according to any one of claims 1 to 9, and the machining method comprises the following steps:
step S1: sleeving a casing (5) of the centrifugal compressor into a mandrel (1) from one end, far away from a first pressure plate (2), of the mandrel (1), and fixing the casing (5) on the first pressure plate (2) through a first positioning hole (21);
step S2: a diffuser (6) and a second pressure plate (3) are sleeved in sequence from one end of the mandrel (1) far away from the first pressure plate (2);
step S3: a compression nut (4) is screwed in from one end, far away from the first pressure plate (2), of the mandrel (1), the diffuser (6) is pressed on the matching end face of the casing (5) by rotating the compression nut (4), and when the compression nut (4) rotates to a position, the first riveting through hole (22) is opposite to the second riveting through hole (31);
step S4: drilling a riveting hole to be machined of the casing (5) through a punching tool which penetrates through the second riveting through hole (31) and passes through a riveting hole (61) which is machined in advance in the blade of the diffuser (6);
step S5: riveting operation is carried out on the riveting hole (61) on the diffuser (6) and the riveting hole on the casing (5) through riveting equipment to obtain a riveted centrifugal compressor;
step S6: and sequentially taking down the compression nut (4), the second pressure plate (3) and the riveted centrifugal compressor.
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