A retaining ring structure for a compressor and a method of installation

Abstract

The application discloses a holding ring structure and mounting method of a compressor and belongs to the technical field of gas turbines, which comprises an upper half inner cylinder and a lower half inner cylinder in an arc shape, further comprises: two fixing members; the two fixing members are connected to fix the upper half inner cylinder and the lower half inner cylinder; a plurality of clamping grooves are arranged on each fixing member; a rotor assembly is coaxially arranged between the upper half inner cylinder and the lower half inner cylinder, and a plurality of groups of dynamic blade sets are distributed on the rotor assembly along the axial direction of the rotor assembly; a plurality of fixing rings are coaxially sleeved on the plurality of groups of dynamic blade sets and have gaps between the plurality of groups of dynamic blade sets, and a locking part corresponding to the clamping grooves on the two fixing members is arranged on each fixing ring, and the locking part is engaged with the corresponding clamping groove; a guide vane set is arranged and is spaced between adjacent dynamic blade sets; the single fixing ring is small in volume, light in mass and low in thermal inertia, and the risk of tip rub of the dynamic blade is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine technology, and particularly relates to a holding ring structure of a compressor and a mounting method. BACKGROUND

[0002] As the core working component of gas turbines, aero-engines and industrial compression systems, the performance of an axial compressor directly determines the efficiency and reliability of the whole machine. In the field of compressor design, the accurate control of the tip clearance is a key technical problem that affects the aerodynamic performance, stability margin and mechanical safety. The tip clearance is defined as the radial distance between the tip of the rotor blade and the inner wall of the holding ring, and its dynamic characteristics are influenced by multiple factors such as thermal-mechanical coupling effect, aerodynamic load fluctuation and rotor dynamics.

[0003] In the existing holding ring structure, the holding ring (equivalent to the fixed ring of the present application) is usually of a monolithic structure, and the guide vane is directly fixed to the inner wall of the holding ring through a tenon and groove or a bolt. This design has significant limitations in dealing with the high load and fast start-stop operation requirements of modern gas turbines:

[0004] Thermal response speed lag: The monolithic holding ring structure is thick and heavy, and has relatively large mass and heat capacity, so the thermal inertia is high. Under the transient operating conditions of unit startup, shutdown or rapid load change, the thermal expansion / contraction speed of the holding ring significantly lags behind the high-speed rotating rotor blade, which easily leads to the risk of tip rub of the rotor blade and affects the safe operation of the unit.

[0005] Therefore, a new type of holding ring structure and its mounting method are needed, which can optimize the thermal response characteristics and adapt to the thermal expansion requirements. SUMMARY

[0006] The holding ring structure and mounting method of the compressor provided by the embodiments of the present application solve the problems in the prior art.

[0007] The embodiment of the present application adopts the technical scheme as follows: a holding ring structure of a compressor, comprising an upper half inner cylinder and a lower half inner cylinder in arc shape, further comprising: two fixing members; two installation gaps are formed between the upper half inner cylinder and the lower half inner cylinder, and the two fixing members are respectively located in the two installation gaps to connect and fix the upper half inner cylinder and the lower half inner cylinder; a plurality of clamping grooves are arranged on each fixing member; a rotor assembly is coaxially arranged between the upper half inner cylinder and the lower half inner cylinder, and a plurality of groups of dynamic blade sets are arranged on the rotor assembly in the axial direction; each group of dynamic blade sets is configured as a plurality of annular dynamic blades connected to the rotor assembly; a plurality of fixing rings are coaxially sleeved on the plurality of groups of dynamic blade sets and have gaps therebetween, and each fixing ring is provided with a locking part corresponding to the clamping grooves on the two fixing members; the locking part is engaged with the corresponding clamping groove to fix the fixing ring; a guide vane set is arranged between adjacent dynamic blade sets; the guide vane set is at least partially located on the adjacent two fixing rings to axially limit the guide vane set; each guide vane set is configured as a plurality of annularly arrayed guide vanes, and the plurality of guide vanes are installed on the adjacent two fixing rings by a quick release assembly to radially limit the guide vanes.

[0008] Preferably, the upper half outer cylinder and the lower half outer cylinder in arc shape are coaxially connected to form a sleeve-shaped outer cylinder structure, the upper half inner cylinder, the lower half inner cylinder and the two fixing members are defined as an inner cylinder structure, the outer cylinder structure is sleeved outside the inner cylinder structure, and the axial direction of the outer cylinder structure is the same as that of the inner cylinder structure; a gap adjusting structure is installed on the outer cylinder structure, and the gap adjusting structure is used to adjust the position of the inner cylinder structure in the outer cylinder structure.

[0009] Preferably, each guide vane comprises an arc-shaped inner ring, a plurality of vane bodies connected to the outer side of the inner ring in a ring shape, and an arc-shaped outer ring connected to the outer side of the plurality of vane bodies, the outer ring is coaxially arranged with the inner ring, the inner ring is coaxially arranged with the rotor assembly, and a gap is left between the inner ring and the outer peripheral wall of the rotor assembly.

[0010] Preferably, the outer ring is formed with two oppositely arranged arc-shaped pieces, the two sides of each fixing ring are coaxially formed with annular grooves, and the two arc-shaped pieces on the outer ring are respectively embedded in the annular grooves of the adjacent two fixing rings and abut against the inner peripheral walls of the annular grooves to axially limit the guide vanes.

[0011] Preferably, the quick release assembly comprises a plurality of arc-shaped top spacers and an arc-shaped end spacer; the plurality of top spacers and the end spacer are arranged in a ring shape to form a complete ring-shaped spacer group, the spacer group is embedded in the annular groove, and the inner circumferential surface of the spacer group abuts against the outer ring of the plurality of guide vanes, and the outer circumferential surface of the spacer group abuts against the outer circumferential wall of the annular groove to achieve radial positioning of the plurality of guide vanes.

[0012] Preferably, the fixing ring is provided with at least two mounting grooves penetrating the outer circumferential wall thereof into the two annular grooves, respectively, the mounting grooves on the adjacent two fixing rings correspond to each other to form a mounting window, the width of the mounting window in the circumferential direction is not less than the width of the top spacer and the end spacer in the circumferential direction, the plurality of top spacers and the end spacer enter the annular groove through the mounting window, and the end spacer is located at the mounting window; the threaded end of the locking bolt penetrates the end spacer and the outer ring of the guide vane to be locked on the corresponding fixing ring to fix the plurality of guide vanes.

[0013] Preferably, the width of the mounting window in the circumferential direction is not less than the maximum width of the guide vane in the circumferential direction; the guide vane is mounted between the adjacent two dynamic impeller groups through the mounting window.

[0014] Preferably, the fixing ring is provided with two notches corresponding to each clamping groove, the part of the fixing ring between the two notches is the locking part; the locking part is embedded in the corresponding clamping groove to achieve axial positioning and radial positioning of the fixing ring, and the fixing part is at least partially embedded in the corresponding two notches to limit the circumferential rotation of the fixing ring.

[0015] Preferably, the gap adjusting structure comprises at least three eccentric pin structures fixed on the outer cylinder structure, the plurality of eccentric pin structures are distributed along the circumference of the outer cylinder structure, the outer circumferential wall of the inner cylinder structure is provided with adjusting holes corresponding to the plurality of eccentric pin structures one by one, and the movable end of the eccentric pin structure is inserted into the corresponding adjusting hole.

[0016] A mounting method of a retaining ring structure of a compressor, comprising the following steps:

[0017] S1: after the lower half outer cylinder is adjusted in place, the lower half inner cylinder is installed; the fixing ring is axially installed on the corresponding dynamic impeller group, and the rotor assembly, the dynamic impeller group and the fixing ring are installed together in the lower half inner cylinder;

[0018] S2: the two fixing parts are preliminarily placed on the upper flange surfaces on the left and right sides of the lower half inner cylinder, respectively, and the locking part of the fixing ring is engaged with the clamping grooves on the corresponding fixing parts, at this time, the mounting window of the fixing ring is located at the top.

[0019] S3: install several guide vanes and several top and end spacers through the installation window; the several guide vanes form a guide vane group, and the two arc-shaped pieces of each guide vane are respectively embedded in the annular grooves of two adjacent fixed rings and abut against the inner circumferential walls of the annular grooves; the several top and end spacers are located in the annular grooves and form a complete ring-shaped spacer group;

[0020] S4: the threaded end of the locking bolt penetrates through the end spacer and the outer circle of the guide vane and is locked on the corresponding fixed ring, so as to fix the several guide vanes.

[0021] S5: place the upper half inner cylinder on the two fixed parts, and fix the upper half inner cylinder, the fixed parts and the lower half inner cylinder through bolts.

[0022] S6: place and connect the upper half outer cylinder on the lower half outer cylinder; at this time, the movable ends of the several eccentric pin structures are inserted into the corresponding adjusting holes, and the position of the inner cylinder structure is adjusted by adjusting the several eccentric pin structures, so that the gap between the inner cylinder structure and the outer cylinder structure reaches a preset value.

[0023] The above-mentioned at least one technical scheme adopted by the embodiment of the present application can achieve the following beneficial effects:

[0024] Firstly, the present application sets the traditional single-piece and large-volume fixed ring into several split small fixed rings, the volume and mass of a single fixed ring are small, and the thermal inertia is low; when the unit starts or stops or the load rapidly changes, the thermal response speed is close to that of the rotor assembly, which can reduce the rotor (equivalent to the rotor assembly and the moving blade) and the stator (the part of the rotor that is fixed and does not move) gap fluctuation caused by thermal expansion difference, and reduce the risk of blade tip rub.

[0025] Secondly, the multiple fixed rings are independently installed and can freely expand along the radial direction; therefore, when a single fixed ring is damaged, the entire fixed ring does not need to be disassembled, and the blade can be replaced individually through the quick release assembly, thereby reducing the maintenance cost. Moreover, only the inner wall of the fixed ring needs to be sprayed with a wear-resistant coating, and the large-area inner wall of the traditional whole-piece fixed ring does not need to be treated, thereby reducing the waste of coating material. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate certain illustrative embodiments of the application and together with the description serve to explain the application. In the drawings:

[0027] Figure 1 is a schematic view of the three-dimensional structure of the present application;

[0028] Figure 2 is a sectional view of the three-dimensional structure of the present application;

[0029] Figure 3Figure 1 is a longitudinal sectional view of the present application;

[0030] Figure 4 Figure 2 is a perspective view of the present application after disassembling the upper half inner cylinder and the upper half outer cylinder;

[0031] Figure 5 Figure 3 is a perspective view of the present application; Figure 4 Figure 4 is a perspective sectional view of the present application;

[0032] Figure 6 Figure 5 is an exploded view of the present application;

[0033] Figure 7 Figure 6 is an installation view of the present application;

[0034] Figure 8 Figure 7 is an installation view of the present application;

[0035] Figure 9 Figure 8 is a perspective view of the present application.

[0036] Reference signs

[0037] 1 - inner cylinder structure; 11 - upper half inner cylinder; 12 - lower half inner cylinder; 13 - adjusting hole;

[0038] 2 - fixing member; 21 - clamping groove;

[0039] 3 - rotor assembly;

[0040] 4 - moving blade assembly; 41 - moving blade;

[0041] 5 - fixing ring; 51 - locking portion; 52 - annular groove; 53 - installation groove; 54 - notch;

[0042] 6 - guide vane assembly; 61 - guide vane; 611 - inner ring; 612 - vane body; 613 - outer ring; 6131 - arc-shaped piece;

[0043] 7 - quick release assembly; 71 - top spacer; 72 - end spacer; 73 - locking bolt;

[0044] 8 - outer cylinder structure; 81 - upper half outer cylinder; 82 - lower half outer cylinder;

[0045] 9 - eccentric pin structure. DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] The technical solutions provided by the embodiments of the present application will be described in detail below in connection with the drawings.

[0048] Referring to Figures 1 to 9 As shown in the figure, the embodiment of the present application provides a holding ring structure of a compressor, belonging to the field of gas turbines, comprising an arc-shaped upper half inner cylinder 11, a lower half inner cylinder 12, a fixing member 2, a rotor assembly 3, a plurality of fixing rings 5 and a guide vane wheel set 6. The rotor assembly 3 is coaxially arranged between the upper half inner cylinder 11 and the lower half inner cylinder 12, and a plurality of sets of movable vane wheel sets 4 are distributed along the axial direction of the rotor assembly 3. Each set of movable vane wheel sets 4 is configured as a plurality of annular movable vanes 41 connected to the rotor assembly 3.

[0049] The fixing member 2 is configured with two; two installation gaps are formed between the upper half inner cylinder 11 and the lower half inner cylinder 12, and the two fixing members 2 are respectively located in the two installation gaps to connect and fix the upper half inner cylinder 11 and the lower half inner cylinder 12; a plurality of clamping grooves 21 are arranged on each fixing member 2; a plurality of fixing rings 5 are coaxially sleeved on a plurality of sets of movable wheel sets and have gaps therebetween, and each fixing ring 5 is provided with a locking portion 51 corresponding to the clamping grooves 21 on the two fixing members 2, and the locking portion 51 is engaged with the corresponding clamping groove 21 to fix the fixing ring 5; the guide vane wheel set 6 is configured with a plurality of sets and is spaced apart between adjacent movable vane wheel sets 4; the guide vane wheel set 6 is at least partially abutted on the adjacent two fixing rings 5 to realize the axial positioning of the guide vane wheel set 6; each set of guide vane wheel sets 6 is configured as a plurality of annularly arrayed guide vanes 61; generally, the adjacent two guide vanes 61 are close to each other in the circumferential direction and have a small gap reserved to give a certain circumferential expansion space when the guide vanes 61 are heated and expanded; a plurality of guide vanes 61 are installed on the adjacent two fixing rings 5 by being provided with a set of quick release assemblies 7 to realize the radial positioning of the guide vanes 61.

[0050] In the embodiment, the compressor holding ring structure can solve the problems of fixing and thermal expansion adaptation of the guide vanes 61; the upper half inner cylinder 11 and the lower half inner cylinder 12 are connected through two fixing members 2, the fixing members 2 are embedded in the mounting gap formed by the two, and an integral annular frame is formed. A plurality of clamping grooves 21 are processed on the fixing member 2 to provide a positioning reference for the fixing ring 5. A plurality of fixing rings 5 are coaxially sleeved outside the rotor blade wheel set 4, each fixing ring 5 covers only one set of blade wheel set 4, and the locking part 51 on the outer periphery of the fixing ring 5 is engaged with the clamping groove 21 of the fixing member 2 to fix the fixing ring 5, while maintaining a predetermined gap with the blade wheel set 4, avoiding the risk of collision or friction caused by the thermal expansion of the moving vane 41 during work.

[0051] A set of guide vane wheel sets 6 are distributed between adjacent fixing rings 5, and the axial ends of the guide vane wheel sets 6 abut against the fixing rings 5 respectively to form axial constraints to prevent the fixing rings 5 from shaking or shifting along the axis of the rotor assembly 3. The guide vanes 61 are arranged in an annular array to form the guide vane wheel set 6, and adjacent guide vanes 61 abut in the circumferential direction and are fixed on the adjacent two fixing rings 5 through the quick release assembly 7 to realize the radial limiting and quick disassembly of the guide vanes 61.

[0052] Therefore, the application sets the traditional single-piece and large-volume fixing ring 5 as a plurality of split small fixing rings 5, and the volume and mass of the single fixing ring 5 are small, and the thermal inertia is low. When the unit starts or stops or the load changes rapidly, the thermal response speed is close to that of the moving vane 41 on the rotor assembly 3, which can reduce the gap fluctuation between the rotor (equivalent to the rotor assembly 3 and the moving vane 41) and the stator (the part fixed outside the rotor) caused by the thermal expansion difference, and reduce the risk of tip rubbing of the moving vane 41.

[0053] In addition, the plurality of fixing rings 5 are independently installed and can freely expand in the radial direction; therefore, when a single fixing ring 5 is damaged, the vane can be replaced through the quick release assembly 7 without disassembling the entire holding ring, which reduces the maintenance cost. Moreover, only the inner wall of the fixing ring 5 needs to be sprayed with a wear-resistant coating, and the large-area inner wall of the traditional whole-piece holding ring does not need to be treated, which reduces the waste of coating materials.

[0054] In some practical applications, as shown in Figures 1 to 3 The holding ring structure further includes arc-shaped upper half outer cylinder 81 and lower half outer cylinder 82, which are coaxially connected to form a sleeve-shaped outer cylinder structure 8, the upper half inner cylinder 11, the lower half inner cylinder 12 and the two fixing members 2 are defined as an inner cylinder structure 1, and the outer cylinder structure 8 is sleeved outside the inner cylinder structure 1, and the axial direction of the outer cylinder structure 8 is the same as that of the inner cylinder structure 1; the outer cylinder structure 8 is provided with a gap adjusting structure for adjusting the position of the inner cylinder structure 1 in the outer cylinder structure 8. Specifically, the gap adjusting structure can adopt the following structure: referring to Figure 3As shown, it comprises at least three eccentric pin structures 9 fixed on the outer cylinder structure 8 (which is the prior art in the field of gas turbine, please refer to the horizontal eccentric structure in the patent document 201520069453.X), a plurality of eccentric pin structures 9 are distributed along the circumference of the outer cylinder structure 8, the outer peripheral wall of the inner cylinder structure 1 is formed with adjusting holes 13 corresponding to the plurality of eccentric pin structures 9, and the movable end of the eccentric pin structure 9 is inserted into the corresponding adjusting hole 13.

[0055] At least three eccentric pins (usually 4) are distributed along the circumference of the outer cylinder structure 8, and the movable end (eccentric shaft section) of the eccentric pin is inserted into the adjusting hole 13 of the outer peripheral wall of the inner cylinder. The axis of the eccentric pin is eccentric to the axis of the fixing hole of the outer cylinder. By rotating the eccentric pin, the eccentric shaft section pushes the inner cylinder structure 1 to move radially (for example, when the eccentric pin rotates clockwise, the inner cylinder structure 1 moves away from the rotation center; when it rotates counterclockwise, it moves close to it). Since a plurality of eccentric pins are distributed along the circumference, the overall concentricity adjustment or local gap compensation of the inner cylinder structure 1 can be achieved by joint adjustment (for example, the inner cylinder structure 1 and the outer cylinder structure 8 have a gap deviation in a certain direction). After adjustment, the position of the eccentric pin is fixed by a nut or a locking pin.

[0056] During the operation of the gas turbine, the inner cylinder structure 1, the fixed ring 5 and the rotor assembly 3 will all expand due to the increase in temperature, and the expansion amount may differ due to different materials and positions. By adjusting the position of the inner cylinder structure 1 in the outer cylinder structure 8 through the eccentric pin, the rotor-stator gap can be compensated to avoid excessive gap or excessive small gap from causing rubbing.

[0057] In some practical applications, the guide vane 61 can be installed by the following structure: as shown in Figure 2 、 Figure 5 and Figure 7 , each guide vane 61 comprises an arc-shaped inner ring 611, a plurality of vane bodies 612 connected around the outer side of the inner ring 611, and an arc-shaped outer ring 613 connected to the outer side of the plurality of vane bodies 612, the outer ring 613 is coaxially arranged with the inner ring 611, the inner ring 611 is coaxially arranged with the rotor assembly 3, and a gap is left between the inner ring 611 and the outer peripheral wall of the rotor assembly 3.

[0058] Specifically, as shown in Figure 5 、 Figure 7 and Figure 9 , the outer ring 613 is formed with two oppositely arranged arc-shaped pieces 6131, each side end of the fixed ring 5 is coaxially formed with an annular groove 52, and the two arc-shaped pieces 6131 on the outer ring 613 are respectively embedded in the annular grooves 52 of the adjacent two fixed rings 5, and the arc-shaped pieces 6131 abut against the inner peripheral wall of the annular grooves 52 to achieve the axial limiting of the guide vane 61.

[0059] In particular, referring to Figures 4 to 9 As shown in the figure, the quick release assembly 7 includes several arc-shaped top spacers 71 and an arc-shaped end spacer 72; the several top spacers 71 and the end spacer 72 are annularly distributed to form a complete ring-shaped spacer group, which is embedded in the annular groove 52, and the inner circumferential surface of the spacer group abuts against the outer ring 613 of the several guide vanes 61, and the outer circumferential surface of the spacer group abuts against the outer circumferential wall of the annular groove 52 to achieve radial positioning of the several guide vanes 61.

[0060] In this embodiment, a single guide vane 61 includes an inner ring 611, a vane body 612, and an outer ring 613; the inner ring 611 is coaxial with the rotor assembly 3 with a gap (to avoid rotor-stator interference); the vane body 612: several (as shown in the figure, one, or more) are uniformly distributed along the outer circumference of the inner ring 611 to form a guide vane aerodynamic passage; the outer ring 613: an arc-shaped structure connecting the outer side of the vane body 612, coaxial with the inner ring 611, and having two arc-shaped pieces 6131 symmetrically arranged on the outer circumference.

[0061] On the axial end surfaces of the two adjacent stationary rings 5, annular grooves 52 (cross-section in U shape) are coaxially machined, and the two arc-shaped pieces 6131 of the outer ring 613 of the guide vane 61 are respectively inserted into the annular grooves 52 of the adjacent stationary rings 5 to form axial fixation. The top spacers 71 (several) and the end spacer 72 (one) are both arc-shaped structures, and their radii are matched with the annular groove 52. By being sequentially installed in the annular groove 52, a complete ring-shaped spacer group is formed. The spacer group is embedded in the annular groove 52 of the stationary ring 5, the inner circumferential surface of the spacer group abuts against the outer circumferential surface of the outer ring 613 of the guide vane 61, and the outer circumferential surface of the spacer group abuts against the outer circumferential wall of the annular groove 52 to achieve radial clamping of the guide vane 61.

[0062] Based on the above quick release assembly 7, it further includes two locking bolts 73 (as shown in the figure Figure 4 and Figure 5 ), and the stationary ring 5 is formed with at least two installation grooves 53 passing through the two annular grooves 52 from the outer circumferential wall thereof, the installation grooves 53 on the two adjacent stationary rings 5 correspond to each other and form an installation window, the width of the installation window in the circumferential direction is not less than the width of the top spacers 71 and the end spacer 72 in the circumferential direction, and the several top spacers 71 and the end spacer 72 enter the annular groove 52 through the installation window, and the end spacer 72 is located at the installation window; the threaded end of the locking bolt 73 penetrates the end spacer 72 and the outer ring 613 of the guide vane 61 to be locked on the corresponding stationary ring 5, thereby fixing the several guide vanes 61.

[0063] In particular, the width of the installation window in the circumferential direction is not less than the maximum width of the guide vane 61 in the circumferential direction; the guide vane 61 is installed between the two adjacent moving impellers 4 through the installation window.

[0064] In the embodiment, the fixing ring 5 is processed with a mounting groove 53 penetrating from the outer peripheral wall to the annular groove 52, and the mounting grooves 53 of two adjacent fixing rings 5 correspond to form a mounting window (for example, as shown in Figure 4 and Figure 7 ). The end spacer 72 (located at the mounting window) is sequentially penetrated by the threaded end of the locking bolt 73, the outer ring 613 of the guide vane 61, and finally screwed into the threaded hole (not shown in the figure) of the fixing ring 5, realizing the locking of the spacer group-guide vane 61 outer ring 613-fixing ring 5.

[0065] The width of the mounting window in the circumferential direction is not less than the maximum circumferential width of the guide vane 61, and not less than the circumferential width of the top spacer 71 and the end spacer 72, ensuring that the guide vane 61 can be embedded in the annular groove 52 of the adjacent fixing ring 5 through the mounting window, and the spacer group can be placed in the annular groove 52 through the mounting window and spliced into a complete ring. Therefore, the mounting window can be used for the installation of a single guide vane 61 and a single top spacer 71 into the groove (annular groove 52) at the same time. It should be noted that, in the actual installation process, in order to ensure that the position of the top spacer 71 away from the mounting window side corresponds to the position of the outer ring 613 on the corresponding position guide vane 61, a special tool is generally used for auxiliary installation, that is, the positions of the top spacer 71 and the outer ring 613 away from the mounting window side are ensured to be accurate (since the protection point of the present application is a holding ring structure, the special tool will not be described in detail).

[0066] When disassembling, only the locking bolt 73 needs to be disassembled to take out the end spacer 72, and then the limiting of the entire spacer group is removed, which is beneficial to the taking out of the several top spacers 71 and guide vanes 61 (the taking out of the remaining top spacers 71 and guide vanes 61 requires the fixing member 2 to be removed).

[0067] In some actual applications, based on any of the above embodiments, the connection mode between the fixing ring 5 and the fixing member 2 is as follows: referring to Figure 2 , Figure 6 and Figure 9 , the fixing ring 5 is formed with two notches 54 corresponding to each clamping groove 21, and the part of the fixing ring 5 between the two notches 54 is the locking part 51; the locking part 51 is embedded in the corresponding clamping groove 21 to realize the axial and radial limiting of the fixing ring 5, and the fixing member 2 is at least partially embedded in the corresponding two notches 54 to limit the circumferential rotation of the fixing ring 5.

[0068] The fixed ring 5 and the fixing member 2 are positioned in multiple directions through the embedding of the gap 54 and the locking portion 51; the fixed ring 5 is provided with two gaps 54 (extending radially along the fixed ring 5) at the positions corresponding to the clamping grooves 21 of the fixing member 2, and the remaining part between the two gaps 54 is the locking portion 51 (the width of which matches the clamping groove 21). The locking portion 51 is embedded in the clamping groove 21 of the fixing member 2, and the gap 54 accommodates the corresponding protruding part around the clamping groove 21 of the fixing member 2 (i.e., the fixing member 2 is at least partially embedded in the gap 54), forming a concave-convex complementary locking connection structure.

[0069] Specifically, the front and rear end faces (two outer side walls in the axial direction) of the locking portion 51 are in contact with the front and rear side walls (two inner side walls in the axial direction) of the clamping groove 21, limiting the movement of the fixed ring 5 in the direction of the rotor axis through surface contact. The radial side of the locking portion 51 is in contact with the clamping groove 21, preventing the fixed ring 5 from moving in the radial direction; as shown in the figure, the radial side of the locking portion 51 has a certain sinking, i.e., it is lower than the outer circumferential surface of the fixed ring 5, and in other embodiments, the radial side of the locking portion 51 can also be directly configured as the outer circumferential surface of the fixed ring 5, i.e., the radial side has no sinking design.

[0070] The fixing member 2 is embedded in the two gaps 54 of the fixed ring 5, and the two side faces of the gap 54 in the circumferential direction are in contact with the two side faces of the fixing member 2 relative to the fixed ring 5 in the circumferential direction, preventing the fixed ring 5 from rotating around the axis of the rotor assembly 3. Therefore, the fixed ring 5 is quickly positioned through the concave-convex matching of the locking portion 51 and the gap 54, and the circumferential, axial, and radial fixation can be completed without complex structure, and the installation time of the single-stage fixed ring 5 can be shortened to a certain extent.

[0071] When several fixed rings 5 need to be disassembled, only the fixing member 2 needs to be removed (i.e., after the connection between the fixing member 2 and the inner cylinder structure 1 is released, the fixing member 2 can be pulled or pushed in the radial direction), which can simultaneously release the positioning of multiple fixed rings 5.

[0072] A mounting method of a holding ring structure of a compressor, comprising the following steps:

[0073] S1: After the lower half outer cylinder 82 is adjusted in place, the lower half inner cylinder 12 is installed; the fixed ring 5 is axially installed on the corresponding moving impeller set 4, and the rotor assembly 3, the moving impeller set 4, and the fixed ring 5 are installed together in the lower half inner cylinder 12;

[0074] S2: The two fixing members 2 are preliminarily placed on the upper flange faces on the left and right sides of the lower half inner cylinder 12, and the locking portion 51 of the fixed ring 5 is matched with the clamping groove 21 on the corresponding fixing member 2, at this time the installation window of the fixed ring 5 is located at the top;

[0075] S3: install several guide vanes 61, and several top spacers 71 and end spacers 72 through the installation window; the several guide vanes 61 form a guide vane set 6, two arc-shaped pieces 6131 of each guide vane 61 are respectively embedded in the annular grooves 52 of two adjacent fixed rings 5, and the arc-shaped pieces 6131 abut against the inner circumferential walls of the annular grooves 52; the several top spacers 71 and end spacers 72 are all located in the annular grooves 52 and form a complete ring-shaped spacer set;

[0076] S4: the threaded end of the locking bolt 73 is locked on the corresponding fixed ring 5 through the end spacer 72 and the outer ring 613 of the guide vane 61, so as to fix the several guide vanes 61.

[0077] S5: place the upper half inner cylinder 11 on the two fixed parts 2, and fix the upper half inner cylinder 11, the fixed part 2 and the lower half inner cylinder 12 through the bolt.

[0078] S6: place and connect the upper half outer cylinder 81 on the lower half outer cylinder 82; at this time, the movable ends of the several eccentric pin structures 9 are all inserted into the corresponding adjusting holes 13, the position of the inner cylinder structure 1 is adjusted by adjusting the several eccentric pin structures 9, so that the gap between the inner cylinder structure 1 and the outer cylinder structure 8 reaches the preset value.

[0079] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A holding ring structure of a compressor comprising an upper half inner cylinder (11) and a lower half inner cylinder (12) in an arc shape, characterized in that, Also include: Fixing piece (2), configured with two; The upper half inner cylinder (11) and the lower half inner cylinder (12) form two installation gaps, and two fixing pieces (2) are respectively located in two installation gaps to connect and fix the upper half inner cylinder (11) and the lower half inner cylinder (12); Each fixing piece (2) is provided with a plurality of clamping grooves (21); Rotor assembly (3), coaxially arranged between the upper half inner cylinder (11) and the lower half inner cylinder (12), a plurality of groups of dynamic impeller groups (4) are distributed on the rotor assembly (3) along the axial direction, and each group of dynamic impeller groups (4) is configured as a plurality of annular dynamic blades (41) connected to the rotor assembly (3); A plurality of fixed rings (5) are coaxially sleeved on a plurality of groups of dynamic impeller groups (4) and have gaps therebetween, and each fixed ring (5) is provided with a locking portion (51) corresponding to the clamping groove (21) on the two fixing pieces (2), and the locking portion (51) is engaged with the corresponding clamping groove (21) to realize the fixation of the fixed ring (5); Guide vane group (6), configured with a plurality of and spaced between adjacent dynamic impeller groups (4); The guide vane group (6) is at least partially abutted on the adjacent two fixed rings (5), so as to realize the axial limiting of the guide vane group (6); Each guide vane group (6) is configured as a plurality of annular array distributed guide vanes (61), and a plurality of guide vanes (61) are installed on the adjacent two fixed rings (5) by being provided with a quick release assembly (7), so as to realize the radial limiting of the guide vane (61); Each guide vane (61) comprises an arc-shaped inner ring (611), a plurality of blade bodies (612) connected to the outer side of the inner ring (611), and an arc-shaped outer ring (613) connected to the outer side of the plurality of blade bodies (612), the outer ring (613) is coaxially arranged with the inner ring (611), the inner ring (611) is coaxially arranged with the rotor assembly (3), and a gap is left between the inner ring (611) and the outer peripheral wall of the rotor assembly (3); The outer ring (613) is formed with two oppositely arranged arc-shaped pieces (6131), and each fixed ring (5) is coaxially formed with an annular groove (52) at both sides; The two arc-shaped pieces (6131) on the outer ring (613) are respectively embedded in the annular grooves (52) of the adjacent two fixed rings (5), and the arc-shaped pieces (6131) abut against the inner circumferential wall of the annular grooves (52), so as to realize the axial limiting of the guide vane (61); The quick release assembly (7) comprises a plurality of arc-shaped top spacers (71) and an arc-shaped end spacer (72); A plurality of top spacers (71) and end spacers (72) are annularly distributed to form a complete ring-shaped spacer group, the spacer group is embedded in the annular groove (52), and the inner circumferential surface of the spacer group abuts against the outer ring (613) of the plurality of guide vanes (61), and the outer circumferential surface of the spacer group abuts against the outer circumferential wall of the annular groove (52), so as to realize the radial limiting of the plurality of guide vanes (61).

2. A retaining ring structure for a compressor according to claim 1, wherein Further comprise arc shape upper half outer cylinder (81) and lower half outer cylinder (82), the upper half outer cylinder (81) and lower half outer cylinder (82) coaxial connection form the sleeve-like outer cylinder structure (8), the upper half inner cylinder (11), lower half inner cylinder (12) and two fixed parts (2) are defined as inner cylinder structure (1), the outer cylinder structure (8) is sleeved in the outer side of the inner cylinder structure (1), and the axial direction of the outer cylinder structure (8) is same with the axial direction of the inner cylinder structure (1);The outer cylinder structure (8) is installed with gap adjusting structure, and the gap adjusting structure is used for adjusting the position of the inner cylinder structure (1) in the outer cylinder structure (8).

3. A retaining ring structure for a compressor according to claim 1, wherein The fixing ring (5) is formed with at least two installation grooves (53) penetrating into two annular grooves (52) from the outer peripheral wall respectively, the installation grooves (53) on the adjacent two fixing rings (5) correspond and form an installation window, the width of the installation window in the circumferential direction is not less than the width of the top spacer (71) and the end spacer (72) in the circumferential direction, and the top spacer (71) and the end spacer (72) enter the annular groove (52) through the installation window, and the end spacer (72) is located at the installation window;The threaded end of the locking bolt (73) penetrates the end spacer (72) and the outer circle (613) of the guide blade (61), and is locked on the corresponding fixing ring (5), and a plurality of guide blades (61) are fixed.

4. A retaining ring structure for a compressor according to claim 3, wherein The width of the installation window in the circumferential direction is not less than the maximum width of the guide blade (61) in the circumferential direction;The guide blade (61) is installed between the adjacent two dynamic impeller groups (4) through the installation window.

5. The retention ring structure of claim 1, wherein The fixing ring (5) is formed with two notches (54) corresponding to each clamping groove (21), and the part of the fixing ring (5) between the two notches (54) is the locking part (51);The locking part (51) is embedded in the corresponding clamping groove (21) to realize the axial and radial positioning of the fixing ring (5), and the fixing part (2) is at least partially embedded in the corresponding two notches (54) to limit the circumferential rotation of the fixing ring (5).

6. A retaining ring structure for a compressor according to claim 2, wherein The gap adjusting structure comprises at least three eccentric pin structures (9) fixed on the outer cylinder structure (8), a plurality of eccentric pin structures (9) are distributed along the circumference of the outer cylinder structure (8), and the outer peripheral wall of the inner cylinder structure (1) is formed with adjusting holes (13) corresponding to the plurality of eccentric pin structures (9) one by one, and the movable end of the eccentric pin structure (9) is inserted into the corresponding adjusting hole (13).

7. A method of mounting a retaining ring structure of a compressor, applied to the retaining ring structure of a compressor according to any one of claims 1 to 6, characterized by, The method comprises the following steps: S1: after the lower half outer cylinder (82) is adjusted in place, the lower half inner cylinder (12) is installed;The fixing ring (5) is axially installed on the corresponding dynamic impeller group (4), and the rotor assembly (3), the dynamic impeller group (4) and the fixing ring (5) are installed in the lower half inner cylinder (12) together; S2: two fixing parts (2) are preliminarily placed on the upper flange surface on the left and right sides of the lower half inner cylinder (12), and the locking part (51) of the fixing ring (5) is matched with the clamping groove (21) on the corresponding fixing part (2), at this time, the installation window of the fixing ring (5) is located at the top. S3: Install several guide vanes (61), and several top spacers (71) and end spacers (72) through the installation window; the several guide vanes (61) form a guide vane group (6), two arc-shaped pieces (6131) of each guide vane (61) are respectively embedded in the annular grooves (52) of the adjacent two fixed rings (5), and the arc-shaped pieces (6131) abut against the inner circumferential walls of the annular grooves (52); the several top spacers (71) and end spacers (72) are all located in the annular grooves (52) and form a complete ring-shaped spacer group; S4: The threaded end of the locking bolt (73) penetrates the end spacer (72) and the outer ring (613) of the guide vane (61) and is locked on the corresponding fixed ring (5), so as to fix the several guide vanes (61); S5: Place the upper half inner cylinder (11) on the two fixed parts (2), and fix the upper half inner cylinder (11), the fixed part (2) and the lower half inner cylinder (12) through the bolt; S6: Place and connect the upper half outer cylinder (81) on the lower half outer cylinder (82); at this time, the movable ends of the several eccentric pin structures (9) are all inserted into the corresponding adjusting holes (13), by adjusting the several eccentric pin structures (9), the position of the inner cylinder structure (1) is adjusted, so that the gap between the inner cylinder structure (1) and the outer cylinder structure (8) reaches a preset value.

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