Compressor rotor and manufacturing method of rotor end ring

Abstract

The invention relates to the technical field of compressors, and particularly discloses a compressor rotor and a manufacturing method of a rotor end ring, the compressor rotor comprises a rotor iron core and the rotor end ring, the rotor iron core comprises a plurality of electromagnet plates, and the plurality of electromagnet plates are sequentially laminated into a cylindrical shape; the two rotor end rings are respectively laminated at the two end parts of the rotor iron core, each rotor end ring comprises a ring body and a balance block, an accommodating cavity is formed in the ring body, the balance block is arranged in the accommodating cavity, the outer wall of the balance block is attached to the inner wall of the accommodating cavity, and the density of the balance block is different from that of the rotor end rings. According to the compressor rotor, the balance blocks are arranged in the ring body, on one hand, the stability of relative fixation of the balance blocks and the ring body is improved, on the other hand, in the high-speed operation process of the compressor rotor, the balance blocks are arranged in the ring body, then wind resistance caused by the balance blocks is avoided, and the energy efficiency of a compressor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a method for manufacturing a compressor rotor and a rotor end ring. Background Art

[0002] During the operation of the compressor, due to the imbalance of the compressor pump structure, a balancing block needs to be added to the compressor motor rotor to balance the imbalance, so as to solve the vibration caused by the imbalance during the operation of the compressor and maintain stable operation. However, the current method of adding a balancing block is to rivet the balancing block on the end of the cast aluminum after the rotor is cast aluminum.

[0003] The balance block is riveted to the cast aluminum end of the rotor, and the riveting reliability is poor, especially for rotors that require secondary heat treatment. After the secondary heat treatment, the loosening rate of the balance block riveting can reach 10%, which poses a great quality risk. In addition, the balance block is a boss structure, and there will be wind resistance during the high-speed operation of the compressor rotor, which reduces the energy efficiency of the compressor.

[0004] Therefore, there is an urgent need for a compressor rotor to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method for manufacturing a compressor rotor and a rotor end ring, so as to solve the problem in the related art that when the balancing block is riveted to the cast aluminum end of the rotor, the rivet reliability is poor, and during the high-speed operation of the compressor rotor, the balancing block will have wind resistance, thereby reducing the energy efficiency of the compressor.

[0006] In one aspect, the present invention provides a compressor rotor, the compressor rotor comprising:

[0007] The rotor core comprises a plurality of electromagnet plates, wherein the plurality of electromagnet plates are sequentially stacked into a cylindrical shape;

[0008] Two rotor end rings are provided and are respectively overlapped on the two ends of the rotor core. The rotor end rings include a ring body and a balancing block. A receiving cavity is provided inside the ring body. The balancing block is arranged in the receiving cavity. The outer wall of the balancing block is in contact with the inner wall of the receiving cavity. The density of the balancing block is different from that of the rotor end ring.

[0009] As a preferred technical solution for the compressor rotor, along the axial direction of the rotor end ring, both end surfaces of the ring body are planes.

[0010] As a preferred technical solution for the compressor rotor, the ring body is formed in one piece.

[0011] As a preferred technical solution for the compressor rotor, the melting point of the balancing block is greater than the melting point of the ring body.

[0012] As a preferred technical solution for the compressor rotor, the accommodating cavity is a sealed structure.

[0013] As a preferred technical solution for the compressor rotor, along the axial direction of the rotor end ring (2), the distance between the end face of the ring body (21) and the balancing block (22) inside the ring body (21) is a, 2mm≤a≤2.5mm.

[0014] On the other hand, the present invention provides a method for manufacturing a rotor end ring, which is used to manufacture a rotor end ring for the compressor rotor of any of the above schemes, comprising a mold and a support protrusion, wherein the mold is provided with an annular groove, and the support protrusion is provided on the bottom wall of the annular groove. The method for manufacturing the rotor end ring comprises:

[0015] S10: arranging the supporting protrusion on the bottom wall of the annular groove;

[0016] S20: The balancing weight is arranged on the supporting protrusion;

[0017] S30: pouring molten metal into the annular groove;

[0018] S40: waiting for a preset time a, the melt solidifies and forms the ring body;

[0019] S50: removing the rotor end ring from the annular groove.

[0020] As a preferred technical solution of the method for manufacturing the rotor end ring, S20 further includes: the supporting protrusion is fixedly arranged on the mold; S50 further includes: using a sealing plug to seal the through hole left by the supporting protrusion on the ring body.

[0021] As a preferred technical solution of the method for manufacturing the rotor end ring, it also includes S60: S60: grinding the two end faces of the ring body along the axial direction.

[0022] As a preferred technical solution of the method for manufacturing the rotor end ring, S30 also includes: the molten liquid is molten aluminum.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a method for manufacturing a compressor rotor and a rotor end ring. The compressor rotor includes a rotor core and a rotor end ring. The rotor core includes a plurality of electromagnet plates, which are sequentially stacked into a cylindrical shape. Two rotor end rings are provided and are respectively stacked on the two ends of the rotor core. The rotor end ring includes a ring body and a balancing block. A receiving cavity is provided inside the ring body. The balancing block is provided in the receiving cavity. The outer wall of the balancing block is fitted with the inner wall of the receiving cavity. The density of the balancing block is different from that of the rotor end ring. The compressor rotor sets the balancing block inside the ring body. On the one hand, it can solve the problem of poor riveting reliability when the balancing block is riveted on the ring body. On the other hand, during the high-speed operation of the compressor rotor, the balancing block is set inside the ring body, thereby avoiding the wind resistance caused by the balancing block and improving the energy efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the rotor end ring in an embodiment of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a mold in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a compressor rotor and a mold in an embodiment of the present invention;

[0028] Figure 4 Flow chart of a method for manufacturing a rotor end ring in an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Rotor core;

[0031] 2. rotor end ring; 21. ring body; 22. balance block;

[0032] 3. Mold; 31. Annular groove; 32. Support protrusion. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] like Figure 1-Figure 3As shown, this embodiment provides a compressor rotor, which includes a rotor core 1 and a rotor end ring 2. The rotor core 1 includes a plurality of electromagnet plates, which are sequentially stacked into a cylindrical shape. Two rotor end rings 2 are provided and are respectively stacked on the two ends of the rotor core 1. The rotor end ring 2 includes a ring body 21 and a balancing block 22. The ring body 21 is provided with a receiving cavity inside, and the balancing block 22 is arranged in the receiving cavity. The outer wall of the balancing block 22 is in contact with the inner wall of the receiving cavity, and the density of the balancing block 22 is different from that of the rotor end ring 2. The compressor rotor sets the balancing block 22 inside the ring body 21. On the one hand, it can solve the problem of poor riveting reliability when the balancing block 22 is riveted to the ring body 21. On the other hand, during the high-speed operation of the compressor rotor, the balancing block 22 is set inside the ring body 21, thereby avoiding the wind resistance caused by the balancing block 22 and improving the energy efficiency of the compressor.

[0038] Optionally, along the axial direction of the rotor end ring 2, both end surfaces of the ring body 21 are planes. In this embodiment, this arrangement can reduce the wind resistance generated by the ring body 21 during the rotation of the compressor rotor.

[0039] Optionally, along the axial direction of the rotor end ring 2, the distance between the end face of the ring body 21 and the balance block 22 inside it is a, 2mm≤a≤2.5mm. In this embodiment, the above arrangement can ensure that the ring body 21 completely covers the balance block 22 to prevent the balance block 22 from oxidation and rust.

[0040] Optionally, the ring body 21 is made in one piece. In this embodiment, this arrangement can improve the strength of the ring body 21 and reduce the manufacturing cost of the ring body 21. Specifically, the ring body 21 can be made by additive manufacturing or casting process.

[0041] Optionally, the melting point of the balancing weight 22 is greater than the melting point of the ring body 21. In this embodiment, when the ring body 21 is made by a casting process, the balancing weight 22 needs to be in direct contact with the molten solution. To prevent the balancing weight 22 from being melted, it is necessary to ensure that the melting point of the balancing weight 22 is greater than the melting point of the ring body 21.

[0042] Optionally, the accommodating cavity is a sealed structure. In this embodiment, this arrangement can reduce the wind resistance of the ring body 21, improve the structural strength of the ring body 21, and prevent the balancing block 22 in the accommodating cavity from rusting, thereby affecting the dynamic balance of the compressor rotor.

[0043] Optionally, the balancing block 22 is made of cast iron. In this embodiment, the thermal expansion coefficient of cast iron is small, so during temperature changes, the volume of cast iron changes slightly. Therefore, the above arrangement can ensure that the balancing block 22 always fits the inner wall of the accommodating cavity.

[0044] like Figure 2-Figure 4As shown, this embodiment also provides a method for manufacturing a rotor end ring, which is used to manufacture a rotor end ring 2 for the compressor rotor in the above scheme, including a mold 3 and a support protrusion 32, the mold 3 is provided with an annular groove 31, and the support protrusion 32 is provided on the bottom wall of the annular groove 31. The method for manufacturing the rotor end ring includes:

[0045] S10 : disposing the supporting protrusion 32 on the bottom wall of the annular groove 31 .

[0046] In this step, the supporting protrusion 32 is placed on the bottom wall of the corresponding annular groove 31 in the annular groove 31 according to the dynamic balancing test data of the compressor rotor.

[0047] S20 : ​​The balancing weight 22 is disposed on the supporting protrusion 32 .

[0048] In this step, the balancing block 22 is disposed on the supporting protrusion 32 , so that the balancing block 22 is spaced apart from the bottom wall of the annular groove 31 .

[0049] S30 : pouring molten metal into the annular groove 31 .

[0050] In this step, the molten metal is poured into the annular groove 31, so that the annular molten metal covers the balancing block 22, and the balancing block 22 is located in the molten metal. Specifically, a fixing hole is provided in the middle of the balancing block 22, and the cast molten metal enters the fixing hole, thereby improving the stability of the fixing between the balancing block 22 and the ring body 21.

[0051] S40: Waiting for a preset time a, the melt solidifies and forms a ring body 21;

[0052] In this step, the molten metal solidifies into a ring body 21 after waiting for a preset time, and the balancing block 22 is arranged inside the ring body 21. Specifically, the molten metal is molten aluminum. Aluminum has a small thermal expansion coefficient, and thus the molten aluminum is not easily deformed during the cooling process.

[0053] S50 : taking the rotor end ring 2 out of the annular groove 31 .

[0054] In this step, the rotor end ring 2 is taken out from the annular groove 31 , thereby completing the manufacture of the rotor end ring 2 .

[0055] Optionally, S20 further includes: the support protrusion 32 is fixedly arranged on the mold 3; S50 further includes: using a sealing plug to seal the through hole left by the support protrusion 32 on the ring body 21. In this embodiment, the support protrusion 32 is integrally formed with the mold. When the ring body 21 is taken out from the annular groove 31, the ring body 21 is separated from the support protrusion 32. At this time, the support protrusion 32 leaves a through hole on the ring body 21 that is connected to the balance block 22. In order to close the through hole and prevent the balance block 22 from rusting, the sealing plug seals the through hole. Specifically, the sealing plug is interference fit with the ring body 21 and is flush with the end face of the ring body 21.

[0056] Optionally, the manufacturing method of the rotor end ring further includes S60, S60: grinding the two end faces of the ring body 21 along its axial direction. In this embodiment, the surface of the ring body 21 taken out from the annular groove 31 is rough and uneven. When the rotor end ring 2 is directly set on the compressor rotor, the rotor end ring 2 will generate a large wind resistance. In order to reduce the wind resistance of the rotor end ring 2, the surface of the rotor end ring 2 is further ground to make the surface of the rotor end ring 2 smooth.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating 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 not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A compressor rotor, characterized in that: include: The rotor core (1) comprises a plurality of electromagnet plates, wherein the plurality of electromagnet plates are stacked in sequence into a cylindrical shape; Two rotor end rings (2) are provided and are respectively overlapped on the two ends of the rotor core (1). The rotor end rings (2) include a ring body (21) and a balancing block (22). A receiving cavity is provided inside the ring body (21). The balancing block (22) is arranged in the receiving cavity. The outer wall of the balancing block (22) is in contact with the inner wall of the receiving cavity. The density of the balancing block (22) is different from that of the rotor end ring (2).

2. The compressor rotor according to claim 1, characterized in that: Along the axial direction of the rotor end ring (2), both end surfaces of the ring body (21) are planes.

3. The compressor rotor according to claim 1, characterized in that: The ring body (21) is integrally formed.

4. The compressor rotor according to claim 3, characterized in that: The melting point of the balancing weight (22) is greater than the melting point of the ring body (21).

5. The compressor rotor according to claim 1, characterized in that: The accommodating cavity is a sealed structure.

6. The compressor rotor according to claim 1, characterized in that Along the axial direction of the rotor end ring (2), the distance between the end surface of the ring body (21) and the balancing block (22) inside the ring body (21) is a, 2mm≤a≤2.5mm.

7. A method for manufacturing a rotor end ring, used for manufacturing a rotor end ring (2) for a compressor rotor according to any one of claims 1 to 6, characterized in that: The invention comprises a mold (3) and a supporting protrusion (32), wherein the mold (3) is provided with an annular groove (31), and the supporting protrusion (32) is arranged on the bottom wall of the annular groove (31). The manufacturing method of the rotor end ring comprises: S10: arranging the supporting protrusion (32) on the bottom wall of the annular groove (31); S20: The balancing weight (22) is arranged on the supporting protrusion (32); S30: pouring molten metal into the annular groove (31); S40: waiting for a preset time a, the melt solidifies and forms the ring body (21); S50: removing the rotor end ring (2) from the annular groove (31).

8. The method for manufacturing a rotor end ring according to claim 7, characterized in that: S20 also includes: the supporting protrusion (32) is fixedly arranged on the mold (3); S50 also includes: using a sealing plug to seal the through hole left by the supporting protrusion (32) on the ring body (21).

9. The method for manufacturing a rotor end ring according to claim 7, characterized in that: The method further comprises S60, wherein S60: grinding the two end faces of the ring body (21) along the axial direction thereof.

10. The method for manufacturing a rotor end ring according to claim 7, characterized in that: S30 also includes: the molten liquid is molten aluminum.

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