Volute assembly of centrifugal compressor

Abstract

The utility model relates to a volute assembly of a centrifugal compressor. Positioning bolts are vertically and evenly distributed on the lower volute in the circumferential direction, holes corresponding to the positioning bolts are evenly distributed in the upper volute in the circumferential direction, and the upper volute is assembled in the mode that the holes correspond to the positioning bolts of the lower volute. Supporting lugs are arranged on the two sides of the bottom of the lower volute, and supports used for supporting the volute assembly are arranged at the bottoms of the supporting lugs. A guide sliding groove penetrating front and back in the axial direction of the volute is formed in the bottom of the supporting lug, and the guide sliding groove is in sliding connection with a guide block on the support. The design of an upper volute and a lower volute is adopted, only bolts on a horizontal split face flange need to be loosened during overhauling, the upper half volute is lifted and moved away, the field overhauling workload and labor intensity are reduced, meanwhile, under the cooperation of a guide groove and a guide block, the volute freely expands in the direction of a guide key when heated to expand, and the service life of the volute is prolonged. Therefore, the generation of thermal deformation stress of the volute is avoided, and the phenomenon that the horizontal offset of the compressor is too large due to the original integral volute design is improved.

Description

Technical Field

[0001] The utility model relates to the field of compressor volute equipment, in particular to a volute assembly of a centrifugal compressor. Background Art

[0002] At present, when a centrifugal compressor is overhauled, the first-stage volute must be completely disassembled before the rotor can be taken out of the machine. When disassembling the first-stage volute, it is required to be very careful, first pull it out horizontally, and then move it in other directions. During installation, care must also be taken to avoid damaging parts such as the impeller and seal. Since the first-stage volute outlet pipe is connected to the middle air pipeline in the form of a flange under the base, the flange bolts must be loosened when disassembling the volute, and the space under the fuselage is small and the volute is very heavy, so such a disassembly and assembly procedure design is very inconvenient. Utility Model Content

[0003] In order to solve or partially solve the problems existing in the related technology, the solution provided by the utility model adopts the design of upper volute and lower volute, which can be carried out by loosening the positioning bolts on the horizontal split surface flange and lifting and removing the upper volute during maintenance, thereby reducing the workload of on-site maintenance and alleviating labor intensity; at the same time, during the disassembly and assembly process, with the cooperation of the guide rod and the guide sleeve, the upper volute and the lower volute are prevented from being damaged by skew collision before lifting and separation, and with the cooperation of the guide groove and the guide block, the upper volute and the lower volute are allowed to expand freely along the direction of the guide block when heated and expanded, thereby avoiding the generation of thermal deformation stress of the volute and improving the phenomenon that the horizontal offset of the compressor is too large due to the original overall volute design.

[0004] The first aspect of the utility model provides a volute assembly of a centrifugal compressor.

[0005] A volute assembly of a centrifugal compressor, characterized in that it comprises an upper volute, a lower volute, a guide block, and a stud;

[0006] The lower volute is evenly and vertically provided with positioning bolts along the circumference, the upper volute is evenly and circumferentially provided with holes corresponding to the positioning bolts, and the upper volute is assembled through the holes corresponding to the positioning bolts of the lower volute;

[0007] The lower volute is provided with support ears along both sides of the bottom, and the bottom of the support ears is provided with a support for supporting the volute assembly;

[0008] The bottom of the support ear is formed with a guide slot that runs through the volute axially in the front and back directions, and the guide slot is slidably connected to the guide block on the support;

[0009] The support ears are connected to the support base via installed studs and nuts.

[0010] Optionally, a groove corresponding to the guide slot is formed on the support, the guide block is placed in the groove, and the guide block is slidably connected to the guide slot.

[0011] Optionally, a guide sleeve is provided on the support, and a guide rod matching the guide sleeve is installed on the upper volute.

[0012] Optionally, a first through hole is opened on the top of the support, a second through hole is opened on the supporting ear, and a third through hole is opened on the lower volute. The first through hole, the second through hole, and the third through hole correspond to each other in vertical positions, and a jack corresponding to the first through hole, the second through hole, and the third through hole is placed on the support.

[0013] The technical solution provided by the utility model may have the following beneficial effects:

[0014] The solution provided by the utility model adopts the design of the upper and lower volute structures, so that during maintenance, it is only necessary to loosen the bolts on the flange of the horizontal split surface, and lift and remove the upper part of the volute, thereby reducing the workload of on-site maintenance and alleviating the labor intensity. At the same time, during the disassembly and assembly process, with the cooperation of the guide rod and the guide sleeve, the upper and lower volutes are prevented from being damaged by skew collision before being lifted and separated. With the cooperation of the guide groove and the guide block, the volute is allowed to expand freely along the direction of the guide key when it is heated and expanded, thereby avoiding the generation of thermal deformation stress of the volute, and improving the phenomenon that the horizontal offset of the compressor is too large due to the original overall volute design. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of a partially enlarged structure of an embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of placing a jack according to an embodiment of the utility model.

[0019] Figure markings: 1-upper volute, 2-lower volute, 3-support ear, 4-support, 5-jack, 6-guide rod, 7-guide sleeve, 8-guide slot, 9-guide block, 10-positioning bolt, 11-first through hole, 12-second through hole, 13-third through hole, 14-stud, 15-nut. DETAILED DESCRIPTION

[0020] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0021] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0024] At present, when disassembling the first-stage volute, it is required to be very careful. First, pull it out horizontally, and then move it in other directions. During installation, care must be taken to avoid damaging parts such as the impeller and seal. Since the first-stage volute outlet pipe is connected to the intermediate air pipeline in the form of a flange under the machine base, the flange bolts must be loosened when disassembling the volute. However, the space under the fuselage is small and the volute is very heavy. Such a disassembly and assembly procedure design is very inconvenient.

[0025] In view of the above-mentioned problems, the solution provided by the utility model adopts the design of the upper volute 1 and the lower volute 2, so that during maintenance, only the positioning bolts 10 on the horizontal split surface flange need to be loosened, and the upper volute 1 can be lifted and removed, thereby reducing the workload of on-site maintenance and alleviating the labor intensity; at the same time, during the disassembly and assembly process, with the cooperation of the guide rod 6 and the guide sleeve 7, the upper volute 1 and the lower volute 2 are prevented from being damaged by tilting and colliding before being lifted and separated, and with the cooperation of the guide groove 8 and the guide block 9, the upper volute 1 and the lower volute 2 are allowed to expand freely along the direction of the guide block 9 when they are heated and expanded, thereby avoiding the generation of thermal deformation stress of the volute and improving the phenomenon that the horizontal offset of the compressor is too large due to the original overall volute design.

[0026] The technical solution of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0027] See also Figure 1-3 The utility model provides a volute assembly device of a centrifugal compressor, comprising an upper volute 1, a lower volute 2, a support ear 3, a support 4, a guide slide 8, a guide block 9, a positioning bolt 10, and a stud 14;

[0028] In this embodiment, the lower volute 2 is vertically and evenly distributed with positioning bolts 10 along the circumference, and the upper volute 1 is circumferentially and evenly distributed with holes corresponding to the positioning bolts 10. The upper volute 1 is assembled with the positioning bolts 10 corresponding to the holes of the lower volute 2, and after installation, it is locked by installing nuts 15 to ensure a basic airtightness of the equipment;

[0029] Specifically, the lower volute 2 is provided with support ears 3 along both sides of the bottom, and the bottom of the support ears 3 is equipped with a support 4 for supporting the volute assembly; the bottom of the support ears 3 is formed with a guide slot 8 that runs through the volute axially forward and backward, and the guide slot 8 is slidably connected with the guide block 9 on the support 4. By providing the guide slot and the guide block 9, the offset and thermal stress of the volute axis position can be reduced, so that the volute can slide axially along the guide key to maintain the concentricity between the units under any circumstances. Specifically, the support ears 3 are connected to the support 4 by installing studs 14 and nuts 15 to ensure the final locking state.

[0030] In this embodiment, a groove corresponding to the guide slot 8 is formed on the support 4, and a guide block 9 slidingly connected to the guide slot 8 is placed in the groove to ensure that the volute can expand freely along the guide key direction when it is heated and expanded, thereby avoiding the generation of thermal deformation stress of the volute and improving the phenomenon that the horizontal offset of the compressor is too large due to the overall volute design. At the same time, the support ear 3 is connected to the support 4 by installing studs 14 and nuts 15. The guide slot 8 and the groove clamp the guide block 9 in the middle, and the guide block 9 will not be displaced. During long-term use, the guide block 9 will not be worn. It can be replaced during the maintenance of the separation equipment to prevent the problem of being unable to replace and ensure the use effect due to the fixed structure during long-term use.

[0031] In this embodiment, a guide sleeve 7 is provided on the support 4, and a guide rod 6 cooperating therewith is installed on the upper volute 1. It is ensured that the upper volute 1 and the lower volute 2 are prevented from being damaged by tilting and collision before being hoisted and separated, and that they are prevented from being offset in the vertical position, thereby ensuring safety during operation.

[0032] On the basis of the above embodiments, in this embodiment, a first through hole 11 is opened on the top of the support 4, a second through hole 12 is opened on the support ear 3, and a third through hole 13 is opened on the lower volute 2. The first through hole 11, the second through hole 12, and the third through hole 13 correspond to each other in vertical positions, and are used to contact the upper volute 1 after the jack 5 is placed on the support 4, and to lift the upper volute 1 and separate it from the lower volute 2 during the disassembly process. That is, in this embodiment, no lifting is required for maintenance, and a large-stroke hydraulic jack 5 can be equipped for use to separate the upper and lower volutes 2. During the separation process, under the protection of the guide rod 6 and the guide sleeve 7, no rollover accident in the horizontal position will occur, and it can be achieved by simply placing the jack 5.

[0033] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A volute assembly of a centrifugal compressor, characterized in that: Including upper volute, lower volute, guide block, stud; The lower volute is evenly and vertically provided with positioning bolts along the circumference, the upper volute is evenly and circumferentially provided with holes corresponding to the positioning bolts, and the upper volute is assembled through the holes corresponding to the positioning bolts of the lower volute; The lower volute is provided with support ears along both sides of the bottom, and the bottom of the support ears is provided with a support for supporting the volute assembly; The bottom of the support ear is formed with a guide slot that runs through the volute axially in the front and back directions, and the guide slot is slidably connected to the guide block on the support; The support ears are connected to the support base via installed studs and nuts.

2. The volute assembly of a centrifugal compressor according to claim 1, characterized in that: A groove corresponding to the guide slot is formed on the support, the guide block is placed in the groove, and the guide block is slidably connected to the guide slot.

3. The volute assembly of a centrifugal compressor according to claim 1 or 2, characterized in that: A guide sleeve is arranged on the support, and a guide rod matching the guide sleeve is installed on the upper volute.

4. The volute assembly of a centrifugal compressor according to claim 3, characterized in that: A first through hole is formed on the top of the support, a second through hole is formed on the support ear, and a third through hole is formed on the lower volute. The first through hole, the second through hole, and the third through hole correspond to each other in vertical positions, and a jack corresponding to the first through hole, the second through hole, and the third through hole is placed on the support.

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