Impeller structure and centrifugal compressor

Abstract

The utility model provides an impeller structure and a centrifugal compressor, the impeller structure comprises a wheel disc, the wheel disc is provided with a plurality of main blades arranged at intervals, and a fluid channel is formed between every two adjacent main blades; the guide vane assembly comprises guide vanes movably connected with the wheel disc, and the guide vanes are arranged in the fluid channel; and the driving mechanism is used for driving the flow guide blades to move in the axial direction of the wheel disc so that the flow guide blades can move between the retraction position and the stretching position, and when the flow guide blades reach the stretching position, the flow guide blades divide the fluid in the fluid channel. By means of the impeller structure, the technical problems that in the related technology, a centrifugal compressor is poor in operation stability under the low-load working condition, and rotation stall and surge are prone to occurring are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal compressors, in particular to an impeller structure and a centrifugal compressor. Background Art

[0002] When used for refrigeration and other purposes, centrifugal compressors have the advantages of large load, stable operation, high efficiency, etc., and have great application value in industry. However, the centrifugal compressors in the prior art have limited operating range under different loads. The centrifugal compressors have poor operating stability under low-load non-design conditions, and usually have performance degradation and rotational stall. In severe cases, surge problems may occur, affecting the performance and life of the centrifugal compressor. This characteristic is determined by the characteristics of the centrifugal compressor itself.

[0003] Therefore, the prior art needs to be further developed. Utility Model Content

[0004] The purpose of the utility model is to overcome the above technical deficiencies and provide an impeller structure and a centrifugal compressor to solve the technical problems in the related art that the centrifugal compressor has poor operating stability under low load conditions and is prone to rotational stall and surge.

[0005] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: an impeller structure is provided, including: a wheel disc, on which a plurality of main blades arranged at intervals are arranged, and a fluid channel is formed between two adjacent main blades; a guide vane assembly, the guide vane assembly includes a guide vane movably connected to the wheel disc, and the guide vane is arranged in the fluid channel; a driving mechanism, the driving mechanism is used to drive the guide vane to move along the axial direction of the wheel disc so that the guide vane moves between a retracted position and an extended position, and when the guide vane reaches the extended position, the guide vane diverts the fluid in the fluid channel.

[0006] Furthermore, the wheel disc comprises a mounting hole arranged between two adjacent main blades, the mounting hole passes through the wheel disc, and the guide blade is movably connected to the mounting hole.

[0007] Furthermore, a guide hole is opened on the side of the wheel disc away from the main blade, and the guide hole is arranged corresponding to the mounting hole; the guide vane assembly includes a guide rod, the guide rod is fixedly connected to the guide vane, the extension direction of the guide rod is parallel to the axial direction of the wheel disc, and the guide rod is movably connected to the guide hole.

[0008] Furthermore, an elastic member is installed in the guide hole, and two ends of the elastic member are respectively in contact with the guide hole and the guide rod. When the guide vane reaches the extended position, the elastic member is in a compressed state.

[0009] Furthermore, the guide vane assembly includes a driving base, on which the guide vanes and guide rods are fixedly arranged; the driving mechanism includes a movable driving component, which abuts against one end of the driving base away from the guide vanes to drive the guide vanes to move.

[0010] Furthermore, the driving mechanism comprises a driving connecting rod, one end of which is fixedly connected to the driving component, and the other end of which protrudes from the driving component, and the driving connecting rod is movably arranged.

[0011] Furthermore, the driving component is an annular structure, and the driving base is an arc-shaped structure that matches the shape of the driving component.

[0012] Further, the driving component includes a first abutting surface abutting against the driving base, and the first abutting surface is an arcuate surface; the driving base includes a second abutting surface abutting against the driving component, and the second abutting surface is an arcuate surface.

[0013] Further, the guide vane is wing-shaped; and / or the guide vane is close to the suction surface of the main blade.

[0014] Furthermore, the guide vane assembly includes a plurality of guide vanes, each of which is drivingly connected to the driving mechanism, and the plurality of guide vanes are nested in layers from small to large in terms of cross-sectional area and are slidably fitted.

[0015] Furthermore, the multiple guide blades include: a first guide blade; a second guide blade, the second guide blade is hollow and has a first slide groove slidably connected to the first guide blade; a third guide blade, the third guide blade is hollow and has a second slide groove slidably connected to the second guide blade, and the third guide blade is slidably connected to the mounting hole; the first guide blade, the second guide blade and the third guide blade are nested in layers from small to large according to the cross-sectional area.

[0016] Further, the guide vane assembly includes: a first drive base, the first drive base is fixedly connected to the first guide vane; a second drive base, the second drive base is fixedly connected to the second guide vane, the second drive base includes a first connection portion and a second connection portion arranged at intervals, and the first drive base is located between the first connection portion and the second connection portion; a third drive base, the third drive base is fixedly connected to the third guide vane, the third drive base includes a third connection portion and a fourth connection portion arranged at intervals, and the first drive base and the second drive base are located between the third connection portion and the fourth connection portion.

[0017] Further, the driving mechanism includes: a first driving component, the first driving component abuts against the first driving base, and the driving connecting rod includes a first driving rod connected to the first driving component; a second driving component, the second driving component includes a first driving ring and a second driving ring abutting against the first connecting portion and the second connecting portion respectively, the driving connecting rod includes a second driving rod and a third driving rod arranged at intervals, and one end of the second driving rod and the third driving rod are respectively connected to the first driving ring and the second driving ring; a third driving component, the third driving component includes a third driving ring and a fourth driving ring abutting against the third connecting portion and the fourth connecting portion respectively, the driving connecting rod includes a fourth driving rod and a fifth driving rod arranged at intervals, and one end of the fourth driving rod and the fifth driving rod are respectively connected to the third driving ring and the fourth driving ring; the first driving component, the second driving component and the third driving component are nested in sequence, the first driving rod is located between the second driving rod and the third driving rod, and the second driving rod and the third driving rod are located between the fourth driving rod and the fifth driving rod.

[0018] Furthermore, the first driving component includes a first connecting bracket connected to the first driving rod, the second driving component includes a second connecting bracket connected to the second driving rod, and the third driving component includes a third connecting bracket connected to the fourth driving rod; wherein the heights of the first connecting bracket, the second connecting bracket and the third connecting bracket increase sequentially.

[0019] Furthermore, the guide vane assemblies include a plurality of guide vane assemblies, which are arranged in one-to-one correspondence with the main blades; the mounting holes include a plurality of mounting holes, which are arranged in one-to-one correspondence with the guide vane assemblies.

[0020] A centrifugal compressor comprises the impeller structure mentioned above.

[0021] Beneficial effects:

[0022] 1. By setting the guide vanes, the guide vanes are movable along the axial direction of the impeller. When the guide vanes reach the extended position, the guide vanes divert the fluid in the fluid channel, so that the flow in each channel is evenly distributed, avoiding problems such as rotational stall and surge. When the guide vanes reach the retracted position, the impeller and the main blades form a conventional impeller structure, which can complete the operation under normal load conditions. By setting the impeller structure mode that can automatically adjust the guide vanes, when the impeller is under different loads, the guide vanes can choose different working positions to ensure that the compressor can also operate stably under low load conditions, thereby improving the compression efficiency and operating range of the compressor, and solving the technical problems in the related art that the centrifugal compressor has poor operating stability under low load conditions and is prone to rotational stall and surge.

[0023] 2. When the guide vane reaches the extended position, the guide vane forces the fluid in the fluid channel to be diverted, dividing the fluid channel into two diversion channels, which can effectively distribute the gas flow in the fluid channel; the guide vane occupies a certain space in the fluid channel, thereby increasing the average fluid flow in the remaining space, further evenly distributing the flow in each channel, improving the fluidity of the fluid, and helping to improve the flow condition and the flow uniformity at the impeller outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the impeller structure adopted in the embodiment of the utility model;

[0025] Figure 2 It is a side view of the impeller structure adopted in the embodiment of the utility model;

[0026] Figure 3 It is a structural schematic diagram of a wheel disc of an impeller structure adopted in an embodiment of the utility model;

[0027] Figure 4 It is a structural schematic diagram of the impeller disc of the impeller structure adopted in the embodiment of the utility model from another perspective;

[0028] Figure 5 It is a structural schematic diagram of the impeller structure adopted in the embodiment of the utility model from another perspective;

[0029] Figure 6 It is an exploded view of the impeller structure adopted in the embodiment of the utility model;

[0030] Figure 7 It is an exploded view of the impeller structure adopted in the embodiment of the utility model from another perspective;

[0031] Figure 8 It is a structural schematic diagram of the first guide vane of the impeller structure adopted in the embodiment of the utility model;

[0032] Fig. 9 It is a top view of the first guide vane of the impeller structure adopted in the embodiment of the utility model;

[0033] Fig.10 It is a structural schematic diagram of the second guide vane of the impeller structure adopted in the embodiment of the utility model;

[0034] Fig.11 It is a top view of the second guide vane of the impeller structure adopted in the embodiment of the utility model;

[0035] Fig.12 It is a structural schematic diagram of the third guide vane of the impeller structure adopted in the embodiment of the utility model;

[0036] Fig.13It is a top view of the third guide vane of the impeller structure adopted in the embodiment of the utility model;

[0037] Fig.14 It is a structural schematic diagram of the first driving component of the impeller structure adopted in the embodiment of the utility model;

[0038] Fig.15 It is a structural schematic diagram of the second driving component of the impeller structure adopted in the embodiment of the utility model;

[0039] Fig.16 It is a structural schematic diagram of the third driving component of the impeller structure adopted in the embodiment of the utility model.

[0040] The above drawings include the following reference numerals:

[0041] 10. wheel disc; 20. main blade; 101. mounting hole; 102. guide hole; 1. guide blade assembly; 11. guide rod; 12. driving base; 121. first driving base; 122. second driving base; 1221. first connecting part; 1222. second connecting part; 123. third driving base; 1231. third connecting part; 1232. fourth connecting part; 2. guide blade; 21. first guide blade; 22. second guide blade; 221. first slide groove; 23 , third guide vane; 231, second slide groove; 3, driving mechanism; 31, driving component; 311, first driving component; 3111, first connecting bracket; 312, second driving component; 3121, first driving ring; 3122, second driving ring; 3123, second connecting bracket; 313, third driving component; 3131, third driving ring; 3132, fourth driving ring; 3133, third connecting bracket; 32, driving connecting rod; 4, first abutting surface; 5, second abutting surface. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0043] According to an embodiment of the present utility model, an impeller structure is provided. Figures 1 to 16, comprising: a wheel disc 10, on which a plurality of main blades 20 arranged at intervals are arranged, and a fluid channel is formed between two adjacent main blades 20; a guide blade assembly 1, the guide blade assembly 1 comprising a guide blade 2 movably connected to the wheel disc 10, the guide blade 2 being arranged in the fluid channel; a driving mechanism 3, the driving mechanism 3 being used to drive the guide blade 2 to move along the axial direction of the wheel disc 10, so that the guide blade 2 moves between a retracted position and an extended position, and when the guide blade 2 reaches the extended position, the guide blade 2 diverts the fluid in the fluid channel.

[0044] Specifically, when the guide vane 2 reaches the extended position, the guide vane 2 diverts the fluid in the fluid channel, dividing the fluid channel into two diversion channels, which can effectively distribute the gas flow in the fluid channel; in addition, the guide vane 2 occupies a certain space in the fluid channel, thereby increasing the average fluid flow in the remaining space, further making the flow in each channel evenly distributed, improving the fluidity of the fluid, and being beneficial to improving the flow condition and the flow uniformity at the impeller outlet, and improving the operating stability and boosting capacity of the impeller structure, thereby achieving the improvement of the efficiency of the impeller when the centrifugal compressor is running at low load, and avoiding problems such as rotational stall and surge.

[0045] By setting the guide vane 2, the guide vane 2 is movable along the axial direction of the impeller 10. When the guide vane 2 reaches the extended position, the guide vane 2 forces the fluid in the fluid channel to be diverted, so that the flow in each channel is evenly distributed, avoiding problems such as rotational stall and surge. When the guide vane 2 reaches the retracted position, the impeller 10 and the main blade 20 form a conventional impeller structure, which can complete the operation under normal load conditions. By setting the impeller structure mode that can automatically adjust the guide vane, when the impeller is under different loads, the guide vane 2 can select different working positions to ensure that the compressor can operate stably under low load conditions, thereby improving the compression efficiency and operating range of the compressor, and solving the technical problems in the related technology that the centrifugal compressor has poor operating stability under low load conditions and is prone to rotational stall and surge.

[0046] In the impeller structure of this embodiment, see Figure 3 The wheel disc 10 includes a mounting hole 101 disposed between two adjacent main blades 20, the mounting hole 101 is disposed through the wheel disc 10, and the guide blade 2 is movably connected to the mounting hole 101. Through the above arrangement, the guide blade 2 passes through the mounting hole 101 to achieve reciprocating movement, and the mounting hole 101 is close to the suction surface of the main blade 20.

[0047] Specifically, when the guide vane 2 reaches the retracted position, the end of the guide vane 2 is hidden in the mounting hole 101 , so that the end is lower than the surface of the wheel disc 10 , so that the wheel disc 10 and the main blades 20 form a conventional impeller structure.

[0048] In the impeller structure of this embodiment, see Figure 4 A guide hole 102 is provided on the side of the wheel disc 10 away from the main blade 20, and the guide hole 102 is arranged corresponding to the mounting hole 101; the guide vane assembly 1 includes a guide rod 11, which is fixedly connected to the guide vane 2, and the extension direction of the guide rod 11 is parallel to the axial direction of the wheel disc 10, and the guide rod 11 is movably connected to the guide hole 102. Through the above arrangement, the installation and positioning of the guide vane assembly 1 can be achieved, and at the same time, when the guide vane 2 moves between the retracted position and the extended position, it is guided by the guide rod 11 and the guide hole 102.

[0049] Specifically, a guide pin is provided on the back side of the wheel disc 10 , and a guide hole 102 is opened in the guide pin to reduce the overall thickness of the main body of the wheel disc 10 .

[0050] In the impeller structure of this embodiment, an elastic member is installed in the guide hole 102, and the two ends of the elastic member are respectively in contact with the guide hole 102 and the guide rod 11. When the guide vane 2 reaches the extended position, the elastic member is in a compressed state. Specifically, when the driving mechanism 3 no longer drives the guide vane 2, the guide vane 2 is released by the elastic member to reset to the retracted position.

[0051] In the impeller structure of this embodiment, see Figure 6 , Figure 8 , Fig.14 The guide vane assembly 1 includes a driving base 12, on which the guide vane 2 and the guide rod 11 are fixedly arranged; the driving mechanism 3 includes a movable driving component 31, and the driving component 31 abuts against an end of the driving base 12 away from the guide vane 2 to drive the guide vane 2 to move. Through the above arrangement, the driving base 12 is pushed by the driving component 31, so that the guide vane 2 reaches the extended position. When the guide vane 2 is in the retracted position, the driving component 31 is spaced apart from the wheel disc 10.

[0052] In the impeller structure of this embodiment, see Figure 6 , Figure 8 , Fig.14 The driving mechanism 3 includes a driving connecting rod 32, one end of which is fixedly connected to the driving component 31, and the other end of which protrudes from the driving component 31, and the driving connecting rod 32 is movably arranged. Through the above arrangement, when external power is applied to the driving connecting rod 32, the driving connecting rod 32 can drive the driving component 31 to move back and forth. In addition, by setting the driving connecting rod 32, the driving connecting rod 32 and the driving ring stop each other, so that the first driving component 311, the second driving component 312 and the third driving component 313 can maintain a relatively stable structural relationship, thereby achieving the role of limiting.

[0053] Specifically, any driving method such as a cylinder, a guide rail slider, etc. can be used as an external power source.

[0054] In the impeller structure of this embodiment, see FIG. Figure 6 , Figure 8 , Fig.14 , the driving component 31 is an annular structure, and the driving base 12 is an arc-shaped structure that matches the shape of the driving component 31. By setting the driving component 31 as an annular structure, when the impeller rotates to any angle, the guide vane 2 can be driven by the driving component 31, thereby improving the driving efficiency of the driving component 31; the shape of the driving base 12 matches the shape of the driving component 31, thereby increasing the contact area between the driving base 12 and the driving component 31.

[0055] Specifically, the end surface of each driving ring and the bottom surface of each driving base are both arc-shaped surfaces.

[0056] It can be understood that during the operation of the centrifugal compressor, the guide vane assembly 1 rotates together with the impeller, while the drive mechanism 3 and the impeller are two independent structures. The drive mechanism 3 does not rotate with the impeller, but whether in the extended position or the retracted position, the drive component 31 always remains in contact with the drive base 12.

[0057] In the impeller structure of this embodiment, see Figure 8 , Fig.14 The driving component 31 includes a first abutting surface 4 abutting against the driving base 12, and the first abutting surface 4 is an arcuate surface; the driving base 12 includes a second abutting surface 5 abutting against the driving component 31, and the second abutting surface 5 is an arcuate surface. Through the above arrangement, the driving base 12 maintains linear contact with the driving component 31, which can reduce the friction between the impeller and the driving component 31 during the rotation process.

[0058] In the impeller structure of this embodiment, see Figure 1 The guide blade 2 is wing-shaped; the guide blade 2 is close to the suction surface of the main blade 20.

[0059] Specifically, when the fluid passes through the guide vane 2, the fluid is separated into two streams, and when leaving the guide vane 2, the two streams are reunited, thus playing a guiding role, so that the flow in each channel is evenly distributed.

[0060] It can be understood that the guide vane 2 includes but is not limited to a wing shape, a rectangular shape, etc., and can also be a curved structure or a structure that imitates the main blade, all of which can achieve the diversion effect on the fluid.

[0061] In the impeller structure of this embodiment, see Figure 6The guide vane assembly 1 includes a plurality of guide vanes 2, which are all connected to the driving mechanism 3, and the plurality of guide vanes 2 are nested and slidably matched in layers according to the cross-sectional area from small to large. By setting a plurality of guide vanes 2, the plurality of guide vanes 2 are nested and slidably matched in layers according to the cross-sectional area from small to large, and under different operating conditions, suitable guide vanes 2 can be selected to achieve different guiding effects, and the plurality of guide vanes 2 can reach the extended position simultaneously or individually.

[0062] Specifically, the larger the cross-sectional area of ​​the guide vane 2 is, the larger the space of the fluid channel it occupies is. Therefore, under a lower load, the guide vane 2 with the largest cross-sectional area can be selected to improve the balance of flow distribution.

[0063] In the impeller structure of this embodiment, see Figure 8-13 The plurality of guide blades 2 include: a first guide blade 21; a second guide blade 22, the second guide blade 22 is hollow and provided with a first slide groove 221 that is slidably connected to the first guide blade 21; a third guide blade 23, the third guide blade 23 is hollow and provided with a second slide groove 231 that is slidably connected to the second guide blade 22, and the third guide blade 23 is slidably connected to the mounting hole 101; the first guide blade 21, the second guide blade 22 and the third guide blade 23 are nested in layers from small to large according to the cross-sectional area. By adopting a layered nested blade structure, the space occupied by the plurality of guide blades 2 can be reduced, and the overall volume of the impeller can be reduced.

[0064] Specifically, the contact surfaces of the first guide vane 21 , the second guide vane 22 and the third guide vane 23 are in contact with each other and are processed with high finish to avoid an increase in friction loss.

[0065] Specifically, a signal is fed back to the driving mechanism 3 through an external flow monitoring signal. According to the size of the flow, when the flow gradually decreases, the first guide blade 21, the second guide blade 22 and the third guide blade 23 gradually start the guidance function. When the flow is relatively high, the first guide blade 21 can be opened alone. When the flow is further reduced, the second guide blade 22 can be opened to guide the flow at the same time as the first guide blade 21. When the flow drops to the lowest, the third guide blade 23 is opened to guide the flow at the same time as the first guide blade 21 and the second guide blade 22. At this time, the guidance effect of the guide blade is the strongest.

[0066] In the impeller structure of this embodiment, see Figure 8-13The guide vane assembly 1 includes: a first driving base 121, the first driving base 121 is fixedly connected to the first guide vane 21; a second driving base 122, the second driving base 122 is fixedly connected to the second guide vane 22, the second driving base 122 includes a first connecting portion 1221 and a second connecting portion 1222 arranged at intervals, the first driving base 121 is located between the first connecting portion 1221 and the second connecting portion 1222; a third driving base 123, the third driving base 123 is fixedly connected to the third guide vane 23, the third driving base 123 includes a third connecting portion 1231 and a fourth connecting portion 1232 arranged at intervals, the first driving base 121 and the second driving base 122 are located between the third connecting portion 1231 and the fourth connecting portion 1232. Through the above arrangement, the first guide vane 21, the second guide vane 22 and the third guide vane 23 can be nested layer by layer.

[0067] Specifically, two guide rods 11 are provided on the first driving base 121 , two guide rods are provided on each connecting portion of the second driving base 122 and the third driving base 123 , and a plurality of guide holes 102 are provided accordingly.

[0068] In the impeller structure of this embodiment, see Figure 14-16 The driving mechanism 3 includes: a first driving component 311, the first driving component 311 is abutted against the first driving base 121, the driving connecting rod 32 includes a first driving rod connected to the first driving component 311, and the first driving component 311 only includes one driving ring; a second driving component 312, the second driving component 312 includes a first driving ring 3121 and a second driving ring 3122 respectively abutting against the first connecting portion 1221 and the second connecting portion 1222, the driving connecting rod 32 includes a second driving rod and a third driving rod arranged at intervals, and one end of the second driving rod and the third driving rod are respectively connected to the first driving ring 3121 and the second driving ring 3122 The third driving component 313 includes a third driving ring 3131 and a fourth driving ring 3132 respectively abutting against the third connecting portion 1231 and the fourth connecting portion 1232, and the driving connecting rod 32 includes a fourth driving rod and a fifth driving rod arranged at intervals, and one end of the fourth driving rod and the fifth driving rod are respectively connected to the third driving ring 3131 and the fourth driving ring 3132; the first driving component 311, the second driving component 312 and the third driving component 313 are nested in sequence, the first driving rod is located between the second driving rod and the third driving rod, and the second driving rod and the third driving rod are located between the fourth driving rod and the fifth driving rod. Specifically, the first driving component 311, the second driving component 312 and the third driving component 313 are arranged one by one with each guide vane, and the first driving component 311, the second driving component 312 and the third driving component 313 are nested in sequence, thereby reducing the space occupied by the driving components.

[0069] Specifically, each driving ring is relatively thin and has a thin-wall structure, so as to reduce the space occupied by the driving components.

[0070] In the impeller structure of this embodiment, see Figure 14-16 , the first driving component 311 includes a first connecting bracket 3111 connected to the first driving rod, the second driving component 312 includes a second connecting bracket 3123 connected to the second driving rod, and the third driving component 313 includes a third connecting bracket 3133 connected to the fourth driving rod; wherein the heights of the first connecting bracket 3111, the second connecting bracket 3123 and the third connecting bracket 3133 are increased in sequence. Through the above configuration, the heights of the first driving component 311, the second driving component 312 and the third driving component 313 are decreased in sequence to avoid the first driving component 311 or the second driving component 312, thereby realizing the nesting of the first driving component 311, the second driving component 312 and the third driving component 313.

[0071] In the impeller structure of this embodiment, see Figure 1 The guide vane assembly 1 includes a plurality of guide vane assemblies 1, which are arranged one-to-one with the main vanes 20; the mounting holes 101 include a plurality of mounting holes 101, which are arranged one-to-one with the guide vane assemblies 1. Specifically, the number of mounting holes 101 is consistent with the main vanes 20, and they are evenly distributed between the main vanes 20. At the same time, the guide vane assemblies 1 corresponding to the mounting holes 101 are evenly distributed like the mounting holes 101. By adopting a driving ring with an annular structure, all guide vane assemblies 1 evenly distributed around the circumference can be driven simultaneously.

[0072] In the centrifugal compressor of this embodiment, the centrifugal compressor includes the impeller structure mentioned above.

[0073] The impeller structure in this embodiment is applied to a centrifugal compressor. Under different operating conditions, by adopting an impeller structure with automatically adjustable guide vanes, the size of the splitter blades can be automatically adjusted, thereby effectively improving the flow loss of the impeller, improving the efficiency of the impeller, and preventing problems such as rotational stall and surge. The operating range of the compressor is widened, and the operating stability of the centrifugal compressor under low load conditions is effectively improved, thereby avoiding problems such as rotational stall and surge.

[0074] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0075] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0076] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0077] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0078] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An impeller structure, characterized in that: include: A wheel disc (10), wherein a plurality of main blades (20) arranged at intervals are provided on the wheel disc (10), and a fluid channel is formed between two adjacent main blades (20); A guide vane assembly (1), the guide vane assembly (1) comprising a guide vane (2) movably connected to the wheel disc (10), the guide vane (2) being arranged in the fluid channel; A driving mechanism (3) is used to drive the guide blade (2) to move along the axial direction of the wheel disc (10) so that the guide blade (2) moves between a retracted position and an extended position; when the guide blade (2) reaches the extended position, the guide blade (2) diverts the fluid in the fluid channel.

2. The impeller structure according to claim 1, characterized in that: The wheel disc (10) comprises a mounting hole (101) arranged between two adjacent main blades (20), the mounting hole (101) being arranged through the wheel disc (10), and the guide blade (2) being movably connected to the mounting hole (101).

3. The impeller structure according to claim 2, characterized in that: A guide hole (102) is provided on a side of the wheel disc (10) facing away from the main blade (20), and the guide hole (102) is arranged corresponding to the mounting hole (101); The guide vane assembly (1) comprises a guide rod (11), the guide rod (11) is fixedly connected to the guide vane (2), the extension direction of the guide rod (11) is parallel to the axial direction of the wheel disc (10), and the guide rod (11) is movably connected to the guide hole (102).

4. The impeller structure according to claim 3, characterized in that: An elastic member is installed in the guide hole (102), and two ends of the elastic member are respectively in contact with the guide hole (102) and the guide rod (11). When the guide blade (2) reaches the extended position, the elastic member is in a compressed state.

5. The impeller structure according to claim 3, characterized in that: The guide vane assembly (1) comprises a driving base (12), on which the guide vane (2) and the guide rod (11) are fixedly arranged; The driving mechanism (3) comprises a movable driving component (31), wherein the driving component (31) abuts against an end of the driving base (12) away from the guide blade (2) to drive the guide blade (2) to move.

6. The impeller structure according to claim 5, characterized in that: The driving mechanism (3) comprises a driving connecting rod (32), one end of which is fixedly connected to the driving component (31), the other end of which protrudes from the driving component (31), and the driving connecting rod (32) is movably arranged.

7. The impeller structure according to claim 5, characterized in that: The driving component (31) is an annular structure, and the driving base (12) is an arc-shaped structure that matches the shape of the driving component (31).

8. The impeller structure according to claim 5, characterized in that: The driving component (31) comprises a first abutting surface (4) abutting against the driving base (12), and the first abutting surface (4) is an arc-shaped surface; and / or, The driving base (12) comprises a second abutting surface (5) abutting against the driving component (31), and the second abutting surface (5) is an arc-shaped surface.

9. The impeller structure according to claim 1, characterized in that: The guide blade (2) is wing-shaped; and / or the guide blade (2) is close to the suction surface of the main blade (20).

10. The impeller structure according to claim 6, characterized in that: The guide vane assembly (1) comprises a plurality of guide vanes (2), each of which is drivingly connected to the drive mechanism (3), and the plurality of guide vanes (2) are nested in layers from small to large in cross-sectional area and are slidably matched.

11. The impeller structure according to claim 10, characterized in that: The plurality of guide vanes (2) include: A first guide vane (21); A second guide blade (22), wherein the second guide blade (22) is hollow and has a first sliding groove (221) slidably connected to the first guide blade (21); A third guide blade (23), wherein the third guide blade (23) is hollow and provided with a second slide groove (231) slidably connected to the second guide blade (22), and the third guide blade (23) is slidably connected to the mounting hole (101); The first guide blade (21), the second guide blade (22), and the third guide blade (23) are nested in layers from small to large cross-sectional areas.

12. The impeller structure according to claim 11, characterized in that: The guide vane assembly (1) comprises: A first driving base (121), wherein the first driving base (121) is fixedly connected to the first guide blade (21); a second driving base (122), the second driving base (122) being fixedly connected to the second guide blade (22), the second driving base (122) comprising a first connecting portion (1221) and a second connecting portion (1222) which are arranged at intervals, and the first driving base (121) being located between the first connecting portion (1221) and the second connecting portion (1222); A third driving base (123), the third driving base (123) being fixedly connected to the third guide blade (23), the third driving base (123) comprising a third connecting portion (1231) and a fourth connecting portion (1232) arranged at intervals, the first driving base (121) and the second driving base (122) being located between the third connecting portion (1231) and the fourth connecting portion (1232).

13. The impeller structure according to claim 12, characterized in that: The driving mechanism (3) comprises: A first driving component (311), the first driving component (311) abuts against the first driving base (121), and the driving connecting rod (32) comprises a first driving rod connected to the first driving component (311); a second driving component (312), the second driving component (312) comprising a first driving ring (3121) and a second driving ring (3122) respectively abutting against the first connecting portion (1221) and the second connecting portion (1222), the driving connecting rod (32) comprising a second driving rod and a third driving rod arranged at intervals, one end of the second driving rod and one end of the third driving rod being respectively connected to the first driving ring (3121) and the second driving ring (3122); A third driving component (313), the third driving component (313) comprising a third driving ring (3131) and a fourth driving ring (3132) respectively abutting against the third connecting portion (1231) and the fourth connecting portion (1232), the driving connecting rod (32) comprising a fourth driving rod and a fifth driving rod arranged at intervals, one end of the fourth driving rod and one end of the fifth driving rod being respectively connected to the third driving ring (3131) and the fourth driving ring (3132); The first driving component (311), the second driving component (312) and the third driving component (313) are nested in sequence, the first driving rod is located between the second driving rod and the third driving rod, and the second driving rod and the third driving rod are located between the fourth driving rod and the fifth driving rod.

14. The impeller structure according to claim 13, characterized in that: The first driving component (311) includes a first connecting bracket (3111) connected to the first driving rod, the second driving component (312) includes a second connecting bracket (3123) connected to the second driving rod, and the third driving component (313) includes a third connecting bracket (3133) connected to the fourth driving rod; wherein the heights of the first connecting bracket (3111), the second connecting bracket (3123) and the third connecting bracket (3133) increase successively.

15. The impeller structure according to claim 2, characterized in that: The guide vane assembly (1) comprises a plurality of guide vane assemblies (1), and the plurality of guide vane assemblies (1) are arranged in one-to-one correspondence with the main vanes (20); The mounting holes (101) include a plurality of mounting holes (101), and the plurality of mounting holes (101) are arranged in a one-to-one correspondence with the plurality of guide vane assemblies (1).

16. A centrifugal compressor, characterized in that: The centrifugal compressor comprises the impeller structure according to any one of claims 1 to 15.

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