Impeller locking structure of centrifugal compressor

Abstract

The utility model discloses an impeller locking structure of a centrifugal compressor, which relates to the technical field of impeller locking and comprises an impeller, a first tensioning structure and a second tensioning structure, the impeller comprises a plurality of blades, and a power shaft is inserted into a middle hole of the impeller through double flat keys and double key grooves. The first tensioning structure and the second tensioning structure are located on the left side and the right side of the impeller correspondingly, and the first tensioning structure comprises an external thread section arranged on the outer circle face of the left end of the power shaft. During use, through the first tensioning structure and the second tensioning structure, the tensioning cap is connected to the left end of the power shaft in a threaded and sleeved mode, meanwhile, the two plug rings are plugged into a gap between the two limiting rings, and therefore the tensioning cap is matched with the plug rings and the limiting rings, and an impeller can be reliably locked through a pure physical structure; the locking force of the locking structure is ensured not to be reduced when the impeller rotates and works quickly, and the reliability and firmness of locking the impeller are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to impeller locking technical field, especially in centrifugal compressor's impeller locking structure. BACKGROUND

[0002] Centrifugal compressor is a kind of compressor, its structure and operating principle are similar to centrifugal blower, can make gas obtain higher pressure, processing capacity is larger, efficiency is higher, exhaust pressure is higher than 0.015 megapascal, gas mainly along the radial flow turbine compressor, also called radial flow compressor, centrifugal compressor is widely used in various process flows, to transport air, various process gases or mixed gas, and improve its pressure.

[0003] Impeller is the main working part of centrifugal compressor, when working, it will rotate at high speed with power shaft, torque is transmitted to impeller by power shaft, since there is a large gas pressure difference between the working side of impeller and the back side of impeller, impeller will be subjected to a large axial thrust, therefore, the reliability of locking structure between centrifugal impeller and power shaft is very important.

[0004] The Chinese utility model patent with patent application number CN201720916055.6 records a kind of device for locking centrifugal compressor impeller, it is stretched by the hydraulic jack set, the hydraulic jack is used to stretch impeller shaft first and then tighten locking nut, use the elastic deformation of impeller shaft to ensure that the expected locking force is reached, both improve the fixing effect of impeller shaft, and have the advantages such as simple structure, easy operation, solve the problems, such as complex structure and inconvenient operation of locking device in prior art, however, the locking force of the above-mentioned impeller locking structure mainly relies on the tension of hydraulic jack, and the stability of the tension of hydraulic jack is not enough when it rotates at high speed with impeller and power shaft, tension reduction is prone to occur, which leads to the decrease of locking force, and further reduces the reliability and firmness of locking. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of impeller locking structure of centrifugal compressor, to solve the problem of poor locking reliability and firmness of the impeller locking structure of existing centrifugal compressor in the above background art.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of impeller locking structure of centrifugal compressor, including impeller, impeller includes multiple blades, the double flat key and double key groove are inserted with power shaft in the hole of impeller, further include first tight structure and second tight structure, the first tight structure and second tight structure are located at the left and right sides of impeller respectively;

[0007] The first tensioning structure comprises an external thread segment formed on the outer circumferential surface of the left end of the power shaft, and a tensioning cap is threadedly connected to the left end of the power shaft through the external thread segment, and the right side surface of the tensioning cap abuts against the left side surface of the impeller;

[0008] The second tensioning structure comprises two limiting rings symmetrically and fixedly connected to the right side surface of the impeller and the outer circumferential surface of the power shaft, and further comprises two plug rings symmetrically inserted between the two limiting rings, and the thickness of the plug ring and the spacing between the two limiting rings are in interference fit.

[0009] Preferably, the second tensioning structure further comprises an annular limiting groove formed on the outer circumferential surface of the power shaft, and further comprises two semicircular limiting protrusions symmetrically and fixedly connected to the side surfaces close to the two plug rings, and the two limiting protrusions are inserted into the limiting groove. This arrangement has the advantages that it ensures that the installation operation of the locking structure can be conveniently and smoothly completed, improves the practicality and convenience of the locking structure, and at the same time, the limiting protrusion cooperating with the limiting groove can enhance the tensile strength of the second tensioning structure, thereby improving the reliability and firmness of the locking structure.

[0010] Preferably, the two limiting rings are symmetrically frustoconical, and the left and right ends of the plug ring are also symmetrically semifrustoconical, and the semifrustoconical surfaces of the left and right ends of the plug ring are respectively matched with and abut against the frustoconical surfaces of the two limiting rings. This arrangement has the advantages that the plug ring can be more smoothly inserted into the gap between the two limiting rings, and further improves the practicality and convenience of the locking structure.

[0011] Preferably, the first tensioning structure comprises a first threaded hole formed in the left end of the power shaft, the left side surface of the tensioning cap is provided with a counterbore, the right side inner wall of the counterbore is provided with a through hole, and the counterbore, the through hole and the first threaded hole are coaxially distributed, and the first tensioning structure further comprises an anti-escape screw rod which penetrates through the counterbore and the through hole and is threadedly inserted into the first threaded hole. This arrangement has the advantages that the tensioning cap can be more reliably abutted against the left side surface of the impeller, thereby more reliably locking the impeller in cooperation with the second tensioning structure, and effectively improves the firmness and reliability of the locking structure.

[0012] Preferably, the second tensioning structure further comprises two reinforcing rings which are symmetrically and fixedly sleeved, and further comprises two pairs of reinforcing grooves symmetrically formed on the side surfaces close to the two plug rings, and the two reinforcing rings are respectively inserted into the two pairs of reinforcing grooves, and the thickness of the reinforcing ring and the thickness of the reinforcing groove are in interference fit. This arrangement has the advantages that it can further enhance the tensile strength of the second tensioning structure, thereby effectively preventing the impeller from slipping along the power shaft in the axial direction, and further improves the reliability and firmness of the locking structure.

[0013] In summary, the technical effects and advantages of the utility model are as follows:

[0014] 1. In the utility model, the first and second tensioning structures are arranged, the tensioning cap is threadedly connected to the left end of the power shaft, and the two plug rings are inserted into the gap between the two limiting rings, so that the tensioning cap, the plug ring and the limiting ring can reliably lock the impeller through a simple physical structure, the locking force of the locking structure is not reduced when the impeller rotates rapidly, and the reliability and firmness of the impeller locking are improved.

[0015] 2. In the utility model, the limiting protrusion and the limiting groove are arranged, the limiting protrusion is inserted into the limiting groove, the plug ring is guided when being inserted into the gap between the two limiting rings, the plug ring can be smoothly inserted into the gap between the two limiting rings, the installation operation of the locking structure can be conveniently and smoothly completed, the practicality and convenience of the locking structure are improved, the tensile strength of the second tensioning structure is improved by matching the limiting protrusion with the limiting groove, and the reliability and firmness of the locking structure are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0017] Figure 1 It is a structure schematic view of the impeller locking structure of the centrifugal compressor in the embodiment of the utility model.

[0018] Figure 2 It is a first partial structure schematic view of the impeller locking structure of the centrifugal compressor in the embodiment of the utility model.

[0019] Figure 3 It is a second partial structure schematic view of the impeller locking structure of the centrifugal compressor in the embodiment of the utility model.

[0020] Figure 4 It is a third partial structure schematic view of the impeller locking structure of the centrifugal compressor in the embodiment of the utility model.

[0021] Figure 5 It is an enlarged schematic view of position A in the embodiment of the utility model. Figure 3

[0022] Figure 6 It is an enlarged schematic view of position B in the embodiment of the utility model. Figure 4 ​​

[0023] Fig. 1, impeller; 11, blade; 2, power shaft; 3, first tensioning structure; 31, external thread section; 32, tensioning cap; 33, first threaded hole; 34, anti-dropping cap; 4, second tensioning structure; 41, limiting ring; 42, plug ring; 43, limiting groove; 44, limiting protrusion; 45, reinforcing ring; 46, reinforcing groove; 47, second threaded hole; 48, fastening screw. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 labor fall within the scope of protection of the present application.

[0025] Embodiment 1

[0026] Please refer to Figures 1-6 The impeller locking structure of the centrifugal compressor shown in the figure comprises an impeller 1, the impeller 1 comprises a plurality of blades 11, a power shaft 2 is inserted into the middle hole of the impeller 1 through double keys and double key grooves, and the impeller locking structure further comprises a first tensioning structure 3 and a second tensioning structure 4, the first tensioning structure 3 and the second tensioning structure 4 are respectively located on the left and right sides of the impeller 1.

[0027] The first tensioning structure 3 comprises an external thread section 31 provided on the outer circumferential surface of the left end of the power shaft 2, the left end of the power shaft 2 is threadedly sleeved with a tensioning cap 32 through the external thread section 31, and the right side surface of the tensioning cap 32 abuts against the left side surface of the impeller 1.

[0028] The second tensioning structure 4 comprises two limiting rings 41 symmetrically fixedly connected to the right side surface of the impeller 1 and the outer circumferential surface of the power shaft 2, and further comprises two plug rings 42 symmetrically inserted between the two limiting rings 41, the thickness of the plug ring 42 and the spacing between the two limiting rings 41 are in interference fit.

[0029] Reference Figures 3-6 The second tensioning structure 4 further comprises an annular limiting groove 43 provided on the outer circumferential surface of the power shaft 2, and further comprises two semicircular limiting protrusions 44 symmetrically fixedly connected to the side surfaces close to each other of the two plug rings 42, the two limiting protrusions 44 can be inserted into the limiting groove 43.

[0030] Specifically, the limiting protrusion 44 is inserted into the limiting groove 43, which can guide the insertion of the plug ring 42 between the two limiting rings 41, so that the plug ring 42 can be smoothly inserted into the gap between the two limiting rings 41, and the installation operation of the locking structure can be conveniently and smoothly completed, thereby improving the practicability and convenience of the locking structure. Meanwhile, the limiting protrusion 44 cooperates with the limiting groove 43 to enhance the tensile strength of the second tension structure 4, thereby improving the reliability and firmness of the locking structure.

[0031] With reference to Figure 5 and Figure 6 , the two limiting rings 41 are symmetrical circular truncated cones, and the left and right ends of the plug ring 42 are also symmetrical semi-circular truncated cones, and the semi-circular truncated surfaces of the left and right ends of the plug ring 42 are adapted to and tightly abut against the circular truncated surfaces of the two limiting rings 41.

[0032] Specifically, the plug ring 42 can be more smoothly inserted into the gap between the two limiting rings 41, thereby further improving the practicability and convenience of the locking structure.

[0033] With reference to Figure 1 and Figure 2 , the first tension structure 3 comprises a first threaded hole 33 formed in the left end of the power shaft 2, and a counterbore is formed in the left side surface of the tension cap 32, a through hole is formed in the right inner wall of the counterbore, and the counterbore, the through hole and the first threaded hole 33 are coaxially distributed, the first tension structure 3 further comprises an anti-dropping screw rod, the anti-dropping screw rod penetrates through the counterbore and the through hole and is threadedly inserted into the first threaded hole 33.

[0034] The first tension structure 3 further comprises an anti-dropping cap 34, the right side surface of the anti-dropping cap 34 is fixedly connected with a plug column, the plug column is inserted into the counterbore, the outer diameter of the plug column and the inner diameter of the counterbore are in interference fit, and the left end of the anti-dropping cap 34 is hemispherical. The anti-dropping cap 34 can limit the anti-dropping screw rod, thereby further improving the firmness of the first tension structure 3.

[0035] Specifically, the tension cap 32 can be more reliably tightly abutted against the left side surface of the impeller 1, thereby cooperating with the second tension structure 4 to more reliably lock the impeller 1, thereby effectively improving the firmness and reliability of the locking structure.

[0036] With reference to Figures 3-6 , the second tension structure 4 further comprises two symmetrical reinforcing rings 45, and the second tension structure 4 further comprises two pairs of reinforcing grooves 46 symmetrically formed on the side surfaces of the two plug rings 42, the two reinforcing rings 45 are respectively inserted into the two pairs of reinforcing grooves 46, and the thickness of the reinforcing ring 45 and the thickness of the reinforcing groove 46 are in interference fit.

[0037] Specifically, the tensile strength of the second locking structure 4 can be further enhanced, so that the impeller 1 can be effectively prevented from slipping along the power shaft 2 in the axial direction, and the reliability and firmness of the locking structure are further improved.

[0038] The second locking structure 4 further comprises two pairs of second threaded holes 47 symmetrically formed on the side surfaces of the two plug rings 42, and two pairs of second threaded holes 47 are also symmetrically formed on the outer side surfaces of the two reinforcing rings 45. The two pairs of second threaded holes 47 on the two plug rings 42 are respectively aligned with the two pairs of second threaded holes 47 on the two reinforcing rings 45, and two pairs of fastening screws 48 are symmetrically screwed into the two pairs of second threaded holes 47 on the two plug rings 42. The two pairs of fastening screws 48 are simultaneously screwed into the two pairs of second threaded holes 47 on the two reinforcing rings 45, so that the two plug rings 42 can be firmly plugged into the gap between the two limiting rings 41, and the locking firmness of the locking structure is improved.

[0039] Finally, it should be noted that the above is only the preferred embodiment of the present application, and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. shall be included in the protection scope of the present application.

Claims

1. An impeller locking structure for a centrifugal compressor, comprising an impeller (1), characterized in that: The impeller (1) includes multiple blades (11). A power shaft (2) is inserted into the central hole of the impeller (1) through a double flat key and a double keyway. It also includes a first tensioning structure (3) and a second tensioning structure (4). The first tensioning structure (3) and the second tensioning structure (4) are located on the left and right sides of the impeller (1), respectively. The first tensioning structure (3) includes an external thread section (31) opened on the outer circular surface of the left end of the power shaft (2). The left end of the power shaft (2) is threaded with a tensioning cap (32) through the external thread section (31). The right side of the tensioning cap (32) is pressed against the left side of the impeller (1). The second tensioning structure (4) includes two limiting rings (41) symmetrically fixedly connected to the right side of the impeller (1) and the outer circumference of the power shaft (2). The second tensioning structure (4) also includes two plug rings (42) symmetrically inserted between the two limiting rings (41). The thickness of the plug rings (42) and the distance between the two limiting rings (41) are interference fit.

2. The impeller locking structure of a centrifugal compressor according to claim 1, characterized in that: The second tensioning structure (4) also includes an annular limiting groove (43) opened on the outer peripheral surface of the power shaft (2). The second tensioning structure (4) also includes two semi-circular limiting protrusions (44) symmetrically fixedly connected to the adjacent sides of the two plug rings (42). The two limiting protrusions (44) can be inserted into the limiting groove (43).

3. The impeller locking structure of a centrifugal compressor according to claim 2, characterized in that: The two limiting rings (41) are symmetrical frustum shapes, and the left and right ends of the plug ring (42) are also symmetrical semi-frustum shapes. The semi-frustum surfaces of the left and right ends of the plug ring (42) are respectively adapted to and tightly abutted against the frustum surfaces of the two limiting rings (41).

4. The impeller locking structure of a centrifugal compressor according to claim 3, characterized in that: The first tensioning structure (3) includes a first threaded hole (33) opened at the left end of the power shaft (2). The tensioning cap (32) has a countersunk hole on the left side and a through hole on the right inner wall of the countersunk hole. The countersunk hole, the through hole and the first threaded hole (33) are coaxially distributed. The first tensioning structure (3) also includes an anti-detachment screw, which passes through the countersunk hole and the through hole and is threaded into the first threaded hole (33).

5. The impeller locking structure of a centrifugal compressor according to claim 4, characterized in that: The second tension structure (4) further includes two reinforcing rings (45) symmetrically fixedly sleeved on the two reinforcing rings (45). The second tension structure (4) also includes two pairs of reinforcing grooves (46) symmetrically opened on the side of the two plug rings (42) close to each other. The two reinforcing rings (45) are respectively inserted into the two pairs of reinforcing grooves (46). The thickness of the reinforcing rings (45) and the thickness of the reinforcing grooves (46) are interference fit.

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