Impeller assembly and compressor with streamlined locking member

Abstract

The present invention discloses an impeller assembly and a compressor with a streamlined locking piece, the impeller assembly comprising: a main shaft; an impeller, the impeller being arranged on the main shaft; a locking piece, the locking piece being inserted through the impeller, the locking piece being threadedly connected to the main shaft, the locking piece fixing the impeller on the main shaft; the locking piece comprising a guide portion, the guide portion being located at the inlet position of the impeller, the guide portion being provided with a process hole, the process hole being used to apply an external force so that the locking piece can be assembled on the main shaft. The impeller assembly of the present invention, by providing a process hole on the guide portion, can apply an external force to the locking piece through the process hole when installing the locking piece, so that the locking piece and the main shaft are tightened, thereby ensuring the locking torque of the locking piece, improving the firmness between the impeller and the main shaft, improving the overall reliability of the impeller assembly, and facilitating operation and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to an impeller assembly and a compressor with a streamlined locking piece. Background Art

[0002] The centrifugal compressor uses the impeller to do work on the gas, so that the gas gains energy, thereby achieving the purpose of compressing the gas. Therefore, the impeller is the core moving part of the centrifugal compressor. Figure 1 As shown, the impeller 2 is mounted on the main shaft 3, and the front end is fixed with a locking nut 1. The locking nut can prevent the impeller and the main shaft from rotating relative to each other and avoid friction loss between parts, and is a very important component.

[0003] like Figure 1 As shown in the figure, the commonly used locking nut has a simple structure and is easy to install. When the centrifugal compressor is operated under non-rated conditions, the refrigerant flow rate decreases, flow separation occurs at the impeller inlet, and the uneven distribution of inlet velocity leads to increased flow loss, which in turn affects the performance of the impeller and the centrifugal compressor. However, due to the uneven distribution of the shape of the existing locking nut along the circumference, the flow separation of the refrigerant will be aggravated when rotating, further worsening the flow separation and uneven velocity distribution at the impeller inlet.

[0004] Although some existing locking nuts adopt a streamlined structure, the surface of the structure is smooth and there is no suitable tool for installation and locking, resulting in the locking nut being loosely assembled. Summary of the invention

[0005] The invention discloses an impeller assembly and a compressor with a streamlined locking piece, which solves the problem that the existing streamlined nut has a smooth surface, resulting in loose assembly of the locking nut.

[0006] According to one aspect of the present invention, an impeller assembly is disclosed, comprising: a main shaft; an impeller, the impeller being arranged on the main shaft; a locking piece, the locking piece being passed through the impeller, the locking piece being threadedly connected to the main shaft, the locking piece fixing the impeller on the main shaft; the locking piece comprising a guide portion, the guide portion being located at the inlet position of the impeller, the guide portion being provided with a process hole, the process hole being used to apply an external force so that the locking piece can be assembled on the main shaft.

[0007] Furthermore, the guide surface of the guide part is a streamlined structure, the first end of the guide part is a diversion end, the second end of the guide part abuts against the impeller, and the diameter of the guide part gradually decreases from the second end to the first end.

[0008] Furthermore, the process hole is arranged on the outer peripheral surface of the guide portion, and the axis of the process hole is perpendicular to the axis of the guide portion.

[0009] Furthermore, there are a plurality of process holes, and the plurality of process holes are arranged at intervals along the circumference of the guide portion.

[0010] Furthermore, the diameter of the second end of the guide portion is equal to the diameter of the impeller hub.

[0011] Furthermore, the locking member further comprises: a screw rod, the screw rod is passed through the impeller, one end of the screw rod is connected to the guide portion, and the screw rod is threadedly connected to the main shaft.

[0012] Furthermore, the thread direction of the screw is opposite to the rotation direction of the main shaft.

[0013] Furthermore, a sealant is provided at the connection between the screw and the main shaft.

[0014] Furthermore, the guide surface of the guide part is a streamlined structure, and the guide part includes a connected variable diameter section and a constant diameter section, the first end of the variable diameter section forms a diverter end, the second end of the variable diameter section is connected to the constant diameter section, and the constant diameter section abuts against the impeller; the diameter of the variable diameter section gradually increases from the diverter end to the constant diameter section, and the diameter of the constant diameter section is a constant diameter.

[0015] Furthermore, the maximum diameter of the guide portion is a, the axial length of the guide portion is b, and the ratio of b:a is in the range of 1 to 2.

[0016] Furthermore, the diameter-changing section comprises a first diameter-changing section and a second diameter-changing section which are connected to each other, the first diameter-changing section is the diversion end, and the second diameter-changing section is located between the first diameter-changing section and the equal-diameter section.

[0017] Furthermore, the axial length of the first diameter-changing section is b1, the axial length of the second diameter-changing section is b2, and the range of b1:b2 is 0.3-1.

[0018] Furthermore, the axial length of the equal-diameter section is b3, and the range of b3:b2 is 0.2 to 0.8.

[0019] Furthermore, the guide portion includes a first variable diameter section, a second variable diameter section and a third variable diameter section which are connected to each other, the first end of the first variable diameter section forms a diversion end, the second end of the first variable diameter section is connected to the second variable diameter section and the third variable diameter section in sequence, and the third variable diameter section abuts against the impeller; the ratio of the minimum diameter to the maximum diameter of the third variable diameter section is in the range of 0.8 to 1.

[0020] Furthermore, the axis of the process hole is perpendicular to the axis of the locking piece.

[0021] According to another aspect of the present invention, a compressor is disclosed, comprising the impeller assembly described above.

[0022] The impeller assembly of the present invention is provided with a process hole on the guide part. When installing the locking piece, an external force can be applied to the locking piece through the process hole to tighten the locking piece and the main shaft, thereby ensuring the locking torque of the locking piece, improving the firmness between the impeller and the main shaft, improving the overall reliability of the impeller assembly, and facilitating operation and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the prior art;

[0024] Figure 2 is a schematic structural diagram of an impeller assembly according to an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a locking member according to an embodiment of the present invention;

[0026] Legend: 10, main shaft; 20, impeller; 30, locking piece; 31, guide part; 311, process hole; 312, reducing section; 312a, first reducing section; 312b, second reducing section; 313, equal diameter section; 32, screw. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the embodiments, but is not limited to the contents of the specification.

[0028] like Figure 2 and 3 As shown, the present invention discloses an impeller assembly, comprising: a main shaft 10, an impeller 20 and a locking piece 30, wherein the impeller 20 is arranged on the main shaft 10; the locking piece 30 is penetrated through the impeller 20, the locking piece 30 is threadedly connected with the main shaft 10, and the locking piece 30 fixes the impeller 20 on the main shaft 10; the locking piece 30 comprises a guide portion 31, the guide portion 31 is located at the entrance position of the impeller 20, and a process hole 311 is arranged on the guide portion 31, and the process hole 311 is used to apply an external force so that the locking piece 30 is assembled on the main shaft 10. The impeller assembly of the present invention is provided with a process hole 311 on the guide portion 31. When installing the locking member 30, an external force can be applied to the locking member 30 through the process hole 311, so that the locking member 30 and the main shaft 10 are tightened, thereby ensuring the locking torque of the locking member 30, improving the firmness between the impeller 20 and the main shaft 10, improving the overall reliability of the impeller assembly, and facilitating operation and improving work efficiency.

[0029] In the above embodiment, the guide part 31 is a column, the guide surface of the guide part 31 is a streamlined structure, the first end of the guide part 31 is a split end, the second end of the guide part 31 abuts against the impeller 20, and the diameter of the guide part 31 gradually decreases from the second end to the first end. The impeller assembly of the present invention sets the guide surface of the guide part 31 on the locking member 30 as a streamlined structure, so that there is no geometric mutation on the outer periphery of the locking member 30. When the refrigerant flows through the locking member 30, the influence of the locking member 30 on the refrigerant can be reduced, and the generation of flow separation can be reduced. At low speeds, the refrigerant flow on the surface of the locking member 30 is more stable, so that the refrigerant velocity distribution at the impeller inlet is uniform.

[0030] In the above embodiment, the process hole 311 is arranged on the outer peripheral surface of the guide part 31, and the axis of the process hole 311 is perpendicular to the axis of the guide part 31. The impeller assembly of the present invention is provided with the process hole 311 on the outer peripheral surface of the guide part 31, and the axis of the process hole 311 is perpendicular to the axis of the guide part 31, so that the installation is convenient and the influence of the process hole 311 on the flow of the refrigerant is reduced.

[0031] In the above embodiment, there are multiple process holes 311, and the multiple process holes 311 are arranged at intervals along the circumference of the guide portion 31. The impeller assembly of the present invention can increase the force application points by arranging multiple process holes 311, making the locking process more convenient. Generally, 2 to 8 are selected. Too few will result in poor fixing effect, and too many will cause waste of processing cost. However, when used in a centrifugal compressor, the process holes can be reduced because the centrifugal compressor has a low speed and a small load.

[0032] In the above embodiment, the diameter of the second end of the guide portion 31 is equal to the diameter of the hub of the impeller 20. The impeller assembly of the present invention forms a smooth transition between the second end of the guide portion 31 and the impeller inlet by making the diameter of the second end of the guide portion 31 equal to the diameter of the hub of the impeller 20, without a geometrical mutation between the two, and the refrigerant flows directly into the inlet of the impeller 20 along the outer surface of the guide portion 31, thereby reducing the flow loss of the refrigerant.

[0033] In the above embodiment, the locking member 30 further includes: a screw 32, the screw 32 is passed through the impeller 20, one end of the screw 32 is connected to the guide portion 31, and the screw 32 is threadedly connected to the main shaft 10. The impeller assembly of the present invention can prevent the locking member 30 from loosening during operation by making the thread direction of the screw 32 opposite to the rotation direction of the main shaft 10, thereby improving the reliability of the impeller assembly.

[0034] In the above embodiment, sealant is provided at the connection between the screw 32 and the main shaft 10. The impeller assembly of the present invention can prevent loosening and improve the stability of operation by providing sealant at the connection between the screw 32 and the main shaft 10.

[0035] In the above embodiment, the guide portion 31 is a cylinder, and the guide surface of the guide portion 31 is a streamlined structure. The guide portion 31 includes a connected variable diameter section 312 and a constant diameter section 313. The first end of the variable diameter section 312 forms a diverter end, and the second end of the variable diameter section 312 is connected to the constant diameter section 313, and the constant diameter section 313 abuts against the impeller 20; the diameter of the variable diameter section 312 gradually increases from the diverter end to the constant diameter section 313, and the diameter of the constant diameter section 313 is a constant diameter.

[0036] Specifically, the guide surface of the guide part 31 is formed by the control line rotating around the axis, and the guide surface of the guide part 31 is symmetrical along the axis. The control line can be designed in multiple forms, for example: the control line has at least one straight line segment constituting a regular area of ​​the locking nut curved surface, and the regular area and the adjacent area on the locking nut curved surface have a smooth transition; or the control line has two straight line segments, and the straight line segments are connected by a curved segment, and the curve is an arc or a parabola; or the control line is a smooth curve, in the shape of an arc or a parabola; or the top of the control line is a smooth curved segment, in the shape of a circle or an ellipse.

[0037] In the above embodiment, the maximum diameter of the guide portion 31 is a, the axial length of the guide portion 31 is b, and the range of b:a is 1 to 2. The larger the value of b:a, the more stable the refrigerant flow, but the longer the length will lead to problems such as increased part weight and increased raw material costs. Therefore, it is advisable to control b:a within 1 to 2, which can make the refrigerant flow more stable and save material costs.

[0038] In the above embodiment, the reducing section 312 includes a first reducing section 312a and a second reducing section 312b connected to each other, wherein the first reducing section 312a is the diversion end, and the second reducing section 312b is located between the first reducing section 312a and the equal diameter section 313. The first reducing section 312a is formed by rotating a smooth curved section around an axis, and the curved section is circular or elliptical; the second reducing section 312b is formed by rotating a smooth curved section around an axis, and the curved section is arc-shaped or parabolic; the equal diameter section 313 is formed by rotating a straight section around an axis; the axial length of the first reducing section 312a is b1, and the axial length of the second reducing section 312b is b2, and the range of b1:b2 is 0.3 to 1. Too small or too large a ratio of b1:b2 will lead to unstable refrigerant flow, therefore, controlling the range of b1:b2 between 0.3 and 1 can make the refrigerant flow more stable.

[0039] In the above embodiment, the axial length of the equal diameter section 313 is b3, and the range of b3:b2 is 0.2 to 0.8. Too small or too large a ratio of b3:b2 will lead to unstable refrigerant flow. By controlling the value of b3:b2 within 0.2 to 0.8, the refrigerant flow can be made more stable.

[0040] In another embodiment not shown, the guide portion 31 includes a first diameter-reducing section 312a, a second diameter-reducing section 312b and a third diameter-reducing section connected to each other, the first end of the first diameter-reducing section 312 forms a diverter end, the second end of the first diameter-reducing section 312a is sequentially connected to the second diameter-reducing section 312b and the third diameter-reducing section, and the third diameter-reducing section abuts against the impeller 20; the ratio of the minimum diameter to the maximum diameter of the third diameter-reducing section is in the range of 0.8 to 1, which can improve the stability of the refrigerant flow. In addition, the second diameter-reducing section 312b can be formed by rotating a straight section around an axis, and the second diameter-reducing section 312b and the adjacent area have a smooth transition, so as to reduce the resistance of the refrigerant flow and improve the stability of the refrigerant flow.

[0041] In the above embodiment, the axis of the process hole 311 is perpendicular to the axis of the locking member 30. The impeller assembly of the present invention makes the axis of the process hole 311 perpendicular to the axis of the locking member 30, thereby facilitating installation and reducing the impact of the process hole 311 on the flow of refrigerant.

[0042] In the above embodiment, a gasket is installed between the locking member 30 and the impeller 20 to reduce wear and also to avoid interference of parts during assembly due to cumulative errors.

[0043] In the above embodiment, the locking member 30 is suitable for a rotating machine with an impeller, such as a centrifugal compressor, a turbocharger, etc.

[0044] According to another aspect of the present invention, a compressor is disclosed, comprising the impeller assembly described above.

[0045] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. An impeller assembly, characterized in that: include: spindle(10); An impeller (20), wherein the impeller (20) is arranged on the main shaft (10); a locking piece (30), the locking piece (30) being threadedly disposed on the impeller (20), the locking piece (30) being threadably connected to the main shaft (10), and the locking piece (30) fixing the impeller (20) on the main shaft (10); The locking member (30) comprises a flow guide portion (31), the flow guide portion (31) being located at the inlet of the impeller (20), and a process hole (311) being provided on the flow guide portion (31), the process hole (311) being used to apply an external force so that the locking member (30) is assembled on the main shaft (10); The guide surface of the guide portion (31) is a streamlined structure. The guide portion (31) comprises a connected variable diameter section (312) and a constant diameter section (313). The first end of the variable diameter section (312) forms a flow splitting end. The second end of the variable diameter section (312) is connected to the constant diameter section (313). The constant diameter section (313) abuts against the impeller (20). The diameter of the variable diameter section (312) gradually increases from the flow splitting end to the constant diameter section (313). The diameter of the constant diameter section (313) is a constant diameter. The maximum diameter of the flow guide portion (31) is a, the axial length of the flow guide portion (31) is b, and the ratio of b to a is in the range of 1 to 2; the diameter-reducing section (312) comprises a first diameter-reducing section (312a) and a second diameter-reducing section (312b) which are connected to each other, the first diameter-reducing section (312a) being the flow-dividing end, the second diameter-reducing section (312b) being located between the first diameter-reducing section (312a) and the equal diameter section (313), the axial length of the first diameter-reducing section (312a) being b1, the axial length of the second diameter-reducing section (312b) being b2, and the ratio of b1 to b2 is in the range of 0.3 to 1, and the axial length of the equal diameter section (313) being b3, and the ratio of b3 to b2 is in the range of 0.2 to 0.

8.

2. The impeller assembly according to claim 1, characterized in that: The guide surface of the guide portion (31) is a streamlined structure, the first end of the guide portion (31) is a flow splitting end, the second end of the guide portion (31) abuts against the impeller (20), and the diameter of the guide portion (31) gradually decreases from the second end to the first end.

3. The impeller assembly according to claim 2, characterized in that: The process hole (311) is arranged on the outer peripheral surface of the flow guide portion (31), and the axis of the process hole (311) is perpendicular to the axis of the flow guide portion (31).

4. The impeller assembly according to claim 2, characterized in that: There are a plurality of process holes (311), and the plurality of process holes (311) are arranged at intervals along the circumference of the guide portion (31).

5. The impeller assembly according to claim 2, characterized in that: The diameter of the second end of the guide portion (31) is equal to the diameter of the hub of the impeller (20).

6. The impeller assembly according to claim 1, characterized in that: The locking member (30) further comprises: A screw (32), wherein the screw (32) is inserted into the impeller (20), one end of the screw (32) is connected to the flow guide portion (31), and the screw (32) is threadedly connected to the main shaft (10).

7. The impeller assembly according to claim 6, characterized in that: The thread direction of the screw rod (32) is opposite to the rotation direction of the main shaft (10).

8. The impeller assembly according to claim 6, characterized in that: A sealant is provided at the connection between the screw rod (32) and the main shaft (10).

9. The impeller assembly according to claim 1, characterized in that: The axis of the process hole (311) is perpendicular to the axis of the locking member (30).

10. A compressor, characterized in that: Comprising an impeller assembly according to any one of claims 1 to 9.

Images