阅读说明：本技术 扩压器、离心压气机及扩压器的装配工艺 (Diffuser, centrifugal compressor and assembling process of diffuser ) 是由 王月华 王建方 王国文 于 2020-04-28 设计创作，主要内容包括：本发明提出一种扩压器、离心压气机及扩压器的装配工艺,扩压器包含机匣本体、多个扩压器叶片以及机匣盖板。多个扩压器叶片设置于机匣本体的前端面并在周向上间隔布置,至少一个扩压器叶片的前端面设置有凸台。机匣盖板设置于多个扩压器叶片的前端面,机匣盖板开设有与凸台一一对应的通槽。凸台容置于通槽,且凸台的前端面显露于机匣盖板的前端面,机匣盖板通过凸台与通槽的焊接设置于多个扩压器叶片。通过上述设计,本发明提出的扩压器在装配过程中,能够在凸台与通槽的接缝处进行焊接,而实现机匣盖板与扩压器叶片的焊接,从而能够大幅降低焊接难度,避免虚焊和漏焊等不良的发生,进而可以避免焊接部位在工作中出现裂纹或断裂故障。(The invention provides a diffuser, a centrifugal compressor and an assembling process of the diffuser. The diffuser blades are arranged on the front end face of the casing body and are arranged at intervals in the circumferential direction, and a boss is arranged on the front end face of at least one diffuser blade. The casing cover plate is arranged on the front end faces of the diffuser blades and is provided with through grooves corresponding to the bosses one by one. The boss is accommodated in the through groove, the front end face of the boss is exposed out of the front end face of the casing cover plate, and the casing cover plate is arranged on the diffuser blades through welding of the boss and the through groove. Through the design, the diffuser provided by the invention can be welded at the joint of the boss and the through groove in the assembling process, so that the welding of the casing cover plate and the diffuser blade is realized, the welding difficulty can be greatly reduced, the poor occurrence of insufficient welding, missing welding and the like is avoided, and the occurrence of cracks or fracture faults of the welding part in the working process can be further avoided.)

1. A diffuser disposed in a centrifugal compressor, the diffuser comprising:

a case body;

the diffuser blades are arranged on the front end face of the casing body and are arranged at intervals in the circumferential direction, and a boss is arranged on the front end face of at least one diffuser blade; and

the casing cover plate is arranged on the front end surfaces of the diffuser blades and is provided with through grooves corresponding to the bosses one by one;

the lug boss is accommodated in the through groove, the front end face of the lug boss is exposed out of the front end face of the casing cover plate, and the casing cover plate is arranged on the diffuser blades through welding of the lug boss and the through groove.

2. The diffuser of claim 1, wherein the diffuser vane includes two bosses disposed on a front end surface thereof, the two bosses being disposed at opposite ends of the diffuser vane.

3. The diffuser of claim 1, wherein the diffuser vane includes three bosses disposed on a front end surface thereof, two of the three bosses are disposed on two end portions of the diffuser vane, and another one of the three bosses is disposed in a middle portion of the diffuser vane.

4. The diffuser of claim 1, wherein the through slot matches a shape of the boss.

5. The diffuser of claim 1, wherein the through slot is in clearance fit with the boss such that a fit gap is formed between the through slot and the boss, and solder is disposed in the fit gap.

6. The diffuser of claim 1, wherein the boss is disposed on each of the leading end surfaces of the plurality of diffuser vanes.

7. The diffuser of claim 6 wherein the bosses provided on the leading end surface of each of the diffuser vanes are disposed in the same number and arrangement.

8. A centrifugal compressor comprising a diffuser, wherein the diffuser is as claimed in any one of claims 1 to 7.

9. A process for assembling a diffuser, comprising the steps of:

a diffuser blade is arranged on the front end face of the casing body;

a boss is arranged on the front end surface of the diffuser blade;

a through groove is formed in the casing cover plate;

covering the casing cover plate on the front side of the casing body, wherein the boss is accommodated in the through groove; and

and welding the lug boss and the through groove.

10. The process for assembling a diffuser according to claim 9, wherein the through groove is in clearance fit with the boss, so that a fit gap is formed between the through groove and the boss; wherein, the assembling process of the diffuser further comprises the following steps:

pouring solder into the matching gap;

and the lug boss and the through groove are welded by welding flux in the matching gap.

Technical Field

The invention relates to the technical field of centrifugal compressors, in particular to a diffuser, a centrifugal compressor and a diffuser assembling process.

Background

Fig. 1 shows a structural form of a diffuser blade 110 of a diffuser structure of a conventional centrifugal compressor, and fig. 2 shows a partial sectional view of the diffuser structure of the conventional centrifugal compressor. As shown in fig. 1, a diffuser blade 110 of a conventional centrifugal compressor generally adopts a structural form with a thin inlet and outlet thickness and a large middle thickness, and has a small blade height and a large chord length. As shown in fig. 2, the body casing 120 and the diffuser blade 110 of the conventional diffuser structure are generally manufactured by integral molding, and the diffuser blade 110 and the cover plate 130 are welded to form a single body.

Since the consistency (the ratio of the chord length of the vane to the distance between two adjacent vanes in the circumferential direction) of the diffuser vane 110, especially the radial diffuser vane 110, is usually large, and the height of the vane is small, the operation space for welding operation between the diffuser vane 110 and the cover plate 130 is small, the welding difficulty is very large, and poor welding and missing welding are easily caused.

With the increase of the rotating speed of the compressor rotor or the increase of the pneumatic load, the diffuser blade 110 bears a large pneumatic load, and the blade, especially the blade root (including the welding part) bears a large steady-state stress in the working process, and when the welding part has a cold joint and a missing joint, the steady-state stress borne by the welding part will be increased sharply due to the stress concentration effect; meanwhile, due to the influence of aerodynamic performance, the diffuser blade 110 is generally small in thickness and low in rigidity, blade vibration or resonance caused by airflow is easy to occur in work, a blade root (including a welding part) bears large vibration stress, when the welding part is subjected to insufficient welding or leakage welding, the rigidity of the blade is further reduced, the vibration or resonance phenomenon of the blade is further aggravated, and due to the stress concentration effect, the vibration stress borne by the welding part is also sharply increased.

Based on the above factors, the welding portion between the diffuser blade 110 and the cover plate 130 of the conventional diffuser is subjected to a large stress (including a steady-state stress and a vibration stress), so that the welding portion is prone to crack or fracture failure, and when a cold joint or a skip joint exists, the failure of the welding portion is more common.

Disclosure of Invention

It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a diffuser with low soldering difficulty and capable of effectively avoiding the generation of cold solder and solder skip.

Another main object of the present invention is to overcome at least one of the drawbacks of the prior art described above and to provide a centrifugal compressor having the diffuser described above.

It is a further primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a process for assembling a diffuser.

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

according to one aspect of the invention, a diffuser is provided for a centrifugal compressor. The diffuser comprises a casing body, a plurality of diffuser blades and a casing cover plate. The diffuser blades are arranged on the front end face of the casing body and are arranged at intervals in the circumferential direction, and a boss is arranged on the front end face of at least one diffuser blade. The casing cover plate is arranged on the front end faces of the diffuser blades, and through grooves corresponding to the bosses one to one are formed in the casing cover plate. The lug boss is accommodated in the through groove, the front end face of the lug boss is exposed out of the front end face of the casing cover plate, and the casing cover plate is arranged on the diffuser blades through welding of the lug boss and the through groove.

According to one embodiment of the invention, the front end surface of the diffuser vane is provided with two bosses which are respectively located at two end parts of the diffuser vane.

According to one embodiment of the invention, the front end surface of the diffuser blade is provided with three bosses, two of the three bosses are respectively located at two end parts of the diffuser blade, and the other boss is located in the middle part of the diffuser blade.

According to one of the embodiments of the present invention, the through groove matches the shape of the boss.

According to one embodiment of the invention, the through groove and the boss are in clearance fit, so that a fit gap is formed between the through groove and the boss, and solder is arranged in the fit gap.

According to one embodiment of the present invention, the front end surfaces of the plurality of diffuser blades are provided with the bosses.

According to one embodiment of the invention, the number and the arrangement positions of the bosses arranged on the front end surface of each diffuser blade are the same.

According to another aspect of the invention, a centrifugal compressor is provided that includes a diffuser. The diffuser is the diffuser proposed by the present invention and described in the above embodiments.

According to yet another aspect of the present invention, a process for assembling a diffuser is provided. The assembling process of the diffuser comprises the following steps:

a diffuser blade is arranged on the front end face of the casing body;

a boss is arranged on the front end surface of the diffuser blade;

a through groove is formed in the casing cover plate;

covering the casing cover plate on the front side of the casing body, wherein the boss is accommodated in the through groove; and

and welding the lug boss and the through groove.

According to one embodiment of the present invention, the through groove and the boss are in clearance fit, so that a fit gap is formed between the through groove and the boss. The assembling process of the diffuser further comprises the step of pouring solder into the matching gap. And the lug boss and the through groove are welded by welding flux in the matching gap.

According to the technical scheme, the diffuser, the centrifugal compressor and the assembling process of the diffuser have the advantages and positive effects that:

the diffuser provided by the invention comprises a casing body, a plurality of diffuser blades and a casing cover plate. The diffuser blades are arranged on the front end face of the casing body and are arranged at intervals in the circumferential direction, and a boss is arranged on the front end face of at least one diffuser blade. The casing cover plate is arranged on the front end faces of the diffuser blades and is provided with through grooves corresponding to the bosses one by one. The lug boss is accommodated in the through groove, the front end face of the lug boss is exposed out of the front end face of the casing cover plate, and the casing cover plate is arranged on the diffuser blades through welding of the lug boss and the through groove. Through the design, the diffuser provided by the invention can be welded at the joint of the boss and the through groove in the assembling process, so that the welding of the casing cover plate and the diffuser blade is realized, the welding difficulty can be greatly reduced, the poor occurrence of insufficient welding, missing welding and the like is avoided, and the occurrence of cracks or fracture faults of the welding part in the working process can be further avoided.

Drawings

Various objects, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

FIG. 1 is a schematic view of a diffuser vane of a diffuser structure of a prior art centrifugal compressor;

FIG. 2 is a partial cross-sectional view of a prior art diffuser configuration for a centrifugal compressor;

FIG. 3 is a partial schematic view of a casing body of a diffuser shown in accordance with an exemplary embodiment;

FIG. 4 is a partial schematic view of a casing cover plate of the diffuser shown in FIG. 3;

FIG. 5 is a partial assembly schematic view of a casing body and casing cover plate of the diffuser shown in FIG. 3.

The reference numerals are explained below:

110. diffuser vanes; 120. a body casing; 130. a cover plate; 210. diffuser vanes; 211. a first boss; 212. a second boss; 220. a case body; 230. a casing cover plate; 231. a through groove.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are accordingly to be regarded as illustrative in nature and not as restrictive.

In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of the invention.

Referring to fig. 3, a partial schematic view of a casing body of a diffuser in accordance with the present invention is representatively illustrated. In the exemplary embodiment, the diffuser proposed by the present invention is described as being applied to a centrifugal compressor as an example. Those skilled in the art will readily appreciate that various modifications, additions, substitutions, deletions, or other changes may be made to the embodiments described below in order to utilize the inventive concepts of the present invention in other types of diffusers or other arrangements, and still fall within the spirit of the presently disclosed diffusers.

As shown in fig. 3, in the present embodiment, the diffuser provided in the present invention can be disposed in a centrifugal compressor, and the diffuser includes a casing body 220, a plurality of diffuser blades 210, and a casing cover 230. Referring to fig. 4 and 5 in combination, a partial schematic view of a casing cover plate 230 of a diffuser capable of embodying principles of the present invention is representatively illustrated in fig. 4; a schematic illustration of a partial assembly of a casing body 220 and casing cover plate 230 of a diffuser capable of embodying principles of the present invention is representatively illustrated in fig. 5. The structure, connection and functional relationship of the main components of the diffuser according to the present invention will be described in detail with reference to the drawings.

As shown in fig. 3 to 5, in the present embodiment, a plurality of diffuser blades 210 are provided on the front end surface of the casing body 220 and arranged at intervals in the circumferential direction. Wherein, the front end surface of each diffuser vane 210 is provided with a boss. The casing cover 230 is disposed at the front side of the casing body 220 and welded to the front end surfaces of the plurality of diffuser blades 210, and the casing cover 230 is provided with through grooves corresponding to the bosses one by one. Accordingly, when the casing cover 230 is mounted on the casing body 220, the casing cover 230 is disposed on the front end surfaces of the diffuser blades 210, and the bosses are respectively received in the through slots, and the front end surfaces of the bosses are exposed from the front end surface of the casing cover 230 through the through slots. The casing cover 230 is welded between the bosses and the through grooves, and is disposed on the casing cover 230. Through the design, in the assembling process of the diffuser provided by the invention, the joint between the boss and the through groove can be welded, so that the welding between the casing cover plate 230 and the diffuser blade 210 is realized, the welding difficulty can be greatly reduced, the poor occurrence of insufficient welding, missing welding and the like is avoided, and the occurrence of cracks or fracture faults at the welding part in the working process can be further avoided.

Preferably, as shown in fig. 3 and 4, in the present embodiment, the front end surface of the diffuser blade 210 may preferably be provided with two bosses, which are defined as the first boss 211 in the present specification, for convenience of understanding and explanation, and to be distinguished from the boss provided at the middle portion of the diffuser blade 210 described below. The two first bosses 211 are preferably located at two ends of the diffuser vane 210, that is, two first bosses 211 are respectively disposed at two ends of the diffuser vane 210 close to the inlet and the outlet of the diffuser.

Accordingly, as shown in fig. 3 and 5, based on the design that the two end portions of the front end surface of the diffuser blade 210 are respectively provided with the first bosses 211, in the present embodiment, the casing cover plate 230 is respectively provided with through grooves corresponding to the first bosses 211, and for convenience of understanding and description, the through grooves are distinguished from the through grooves corresponding to the second bosses of the diffuser blade 210, which are defined as the first through grooves 231 in the present specification. That is, the casing cover plate 230 has a plurality of first through grooves 231 formed therein, and the first through grooves 231 are respectively arranged in one-to-one correspondence with the plurality of first bosses 211.

Further, in other embodiments, it is also preferable that a boss is provided at the middle portion of the diffuser blade 210, based on the design that the first bosses 211 are provided at both end portions of the diffuser blade 210, respectively. In order to distinguish the first bosses 211 provided at both end portions of the diffuser vane 210, the boss provided at the middle portion of the diffuser vane 210 is defined as a second boss in the present specification. Wherein, the second boss can be one or more.

Correspondingly, based on the design that the middle of the diffuser blade 210 is provided with the second bosses, the casing cover plate 230 is respectively provided with a plurality of through grooves corresponding to the second bosses. In order to distinguish the first through groove 231 from the second through groove, the through groove corresponding to the second boss is defined as the second through groove in the present specification.

For example, in another embodiment of the present invention, the front end surface of the diffuser vane 210 is provided with three bosses, which are two first bosses 211 provided at both end portions of the front end surface of the diffuser vane 210 and one second boss provided at the middle portion of the front end surface of the diffuser vane 210, respectively. Accordingly, the casing cover 230 has two first through grooves 231 and one second through groove corresponding to the diffuser blade 210. Accordingly, when the casing cover 230 is disposed on the diffuser blade 210, the two first through grooves 231 respectively receive the two first bosses 211 of the diffuser blade 210, and the second through groove receives the second boss of the diffuser blade 210.

Preferably, as shown in fig. 3, in the present embodiment, the shapes of the through groove and the boss may preferably match each other. The above description of mutual matching can be understood as that the shape of the through groove is the same as that of the boss, and the size of the through groove is equal to or slightly larger than that of the boss.

Preferably, in the present embodiment, the engagement between the through groove and the boss may preferably be a clearance fit. That is, the size of the through slot is larger than the size of the boss with which it is fitted. Therefore, when the boss is accommodated in the through groove matched with the boss, a matching gap is formed between the through groove and the boss. On the basis, a solder may be preferably provided in the fitting gap to solder the solder at the position during the assembly process, so as to realize the welding of the casing cover plate 230 and the diffuser blade 210.

Preferably, in the present embodiment, the diffuser proposed by the present invention may preferably be provided with a boss at the front end surface of all the diffuser blades 210 thereof. Accordingly, the casing cover 230 may be coupled to all of the diffuser blades 210 by the engagement of the through slots and the bosses.

Further, based on the design that all the diffuser blades 210 of the diffuser are provided with the bosses, in the present embodiment, the number and the arrangement positions of the bosses provided on the front end surface of each diffuser blade 210 may preferably be the same. In other embodiments, when all of the diffuser blades 210 are provided with bosses, or when more than one of the diffuser blades 210 are provided with bosses, the number and arrangement of the bosses on the diffuser blades 210 provided with bosses may not be completely the same or different, which is not limited to this embodiment.

It should be noted herein that the diffusers shown in the drawings and described in the present specification are but a few examples of the wide variety of diffusers that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the diffuser or any of the components of the diffuser shown in the drawings or described in the present specification.

Based on the above detailed description of one exemplary embodiment of the diffuser proposed by the present invention, an exemplary embodiment of the centrifugal compressor proposed by the present invention will be described below.

In this embodiment, the centrifugal compressor proposed by the present invention includes a diffuser. The diffuser is the diffuser proposed by the present invention and described in detail in the above embodiments.

It should be noted herein that the centrifugal compressors shown in the drawings and described in the present specification are only a few examples of the many types of centrifugal compressors that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the centrifugal compressor or any of the components of the centrifugal compressor shown in the drawings or described in the specification.

Based on the above detailed description of one exemplary embodiment of the diffuser proposed by the present invention, an exemplary embodiment of an assembling process of the diffuser proposed by the present invention will be described below.

In this embodiment, the assembling process of the diffuser provided by the present invention comprises the following steps:

a diffuser blade is arranged on the front end face of the casing body;

a boss is arranged on the front end surface of the diffuser blade;

a through groove is formed in the casing cover plate;

covering the casing cover plate on the front side of the casing body, and accommodating the boss in the through groove; and

and welding the lug bosses and the through grooves.

Preferably, in the present embodiment, the engagement relationship between the through slot and the boss may preferably be a clearance fit, so that a fit gap is formed between the through slot and the boss. On the basis, in the assembling process of the diffuser, the step of pouring solder into the matching gap is further included. That is, in the step of soldering the boss and the through groove, the solder in the fitting gap is soldered.

It should be noted herein that the assembly process of the diffuser shown in the drawings and described in this specification is but a few examples of the many types of assembly processes that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any details or any steps of the assembly process shown in the drawings or described in this specification.

In summary, the diffuser provided by the present invention includes a casing body, a plurality of diffuser blades, and a casing cover plate. The diffuser blades are arranged on the front end face of the casing body and are arranged at intervals in the circumferential direction, and a boss is arranged on the front end face of at least one diffuser blade. The casing cover plate is arranged on the front side of the casing body and welded with the front end faces of the diffuser blades, and the casing cover plate is provided with through grooves corresponding to the bosses one to one. The boss is accommodated in the through groove, and the front end face of the boss is exposed out of the front end face of the casing cover plate. Through the design, the diffuser provided by the invention can be welded at the joint of the boss and the through groove in the assembling process, so that the welding of the casing cover plate and the diffuser blade is realized, the welding difficulty can be greatly reduced, the poor occurrence of insufficient welding, missing welding and the like is avoided, and the occurrence of cracks or fracture faults of the welding part in the working process can be further avoided.

In addition, in order to verify the technical effect of the diffuser provided by the invention, the applicant installs the diffuser in a turboshaft engine which has acquired China civil aviation airworthiness, and a large number of bench tests are carried out, and the experimental result and the outfield use condition show that when the diffuser provided by the invention is adopted, the welding part of the diffuser blade and the casing cover plate is firmly welded, no crack or fracture fault occurs, and the use result is reliable.

Exemplary embodiments of the diffuser, centrifugal compressor and assembly process of the diffuser proposed by the present invention are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and the description are used merely as labels, and are not numerical limitations of their objects.

While the present invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.