Motor structure

Abstract

The utility model provides a motor structure, which comprises a cylinder body, a rotor, a rotor and a motor, wherein the cylinder body is internally provided with a mounting cavity; the stator component is arranged in the mounting cavity, and the stator component is connected with the cylinder body; a connecting cavity is formed in the stator component; the rotor part is arranged in the connecting cavity in a penetrating manner; the bearing support is connected with the stator component; the thrust bearing is connected with the bearing support; and the positioning component is provided with a first positioning part fixedly connected with the bearing support and a second positioning part abutted against the rotor component so as to limit relative movement of the rotor component and the stator component, and the motor structure solves the technical problem that a motor in the related technology is easy to damage due to structural stress during installation.

Description

Technical Field

[0001] The utility model relates to the technical field of motor installation, in particular to a motor structure. Background Art

[0002] At present, permanent magnet motors are increasingly used in centrifugal compressors. The permanent magnets of the motor rotor components have uneven distribution of magnetic attraction. Regardless of whether they are inserted into the shaft horizontally or vertically, they will be sucked to one side by the stator, which has an adverse effect on the assembly efficiency and operating reliability of the compressor.

[0003] On the one hand, before the other bearing support is assembled in place, the rotor component is supported by only one radial bearing. When the shaft is inserted horizontally, the effects of gravity and magnetic attraction will cause the rotor component to tilt and stick to the stator. When the shaft is inserted vertically, although there is no gravity, the uneven magnetic attraction will also cause the rotor component to tilt and stick to the stator. At this time, the thrust plate will be tilted and pressed against one side of the bearing due to the magnetic attraction, which is likely to cause excessive pressure on the outer ring of the thrust plate, causing deformation of the main and auxiliary thrust surfaces of the thrust plate, and worsening its verticality relative to the main shaft. This is especially true when the compressor bearings use dynamic pressure foil bearings and static pressure bearings, the bearing capacity of such bearings is relatively sensitive to clearance. It is sensitive and has high requirements for the verticality of the thrust plate, usually within one thread. Even if the processing accuracy is qualified, assembly problems will cause the accuracy to deteriorate. At the same time, during the assembly process, the dynamic pressure foil may have its elasticity deteriorated due to excessive magnetic attraction. These will affect the reliability during actual operation. At present, the failure rate of this type of compressor in the industry is higher than that of oil-bearing compressors, and this reason cannot be ruled out. On the other hand, if the rotor components collide severely with the stator during assembly, the main shaft may bend, affecting the consistency of the direction of the permanent magnet's magnetic field, and also reducing the dynamic balancing accuracy level, causing the vibration of the rotor components to increase, reducing the assembly efficiency and the reliability of the compressor operation.

[0004] However, there is no effective solution in the industry except vertical shaft entry, but vertical shaft entry cannot eliminate the problem of uneven magnetic attraction, and cannot eliminate the problem of thrust plate force caused by flipping the compressor.

[0005] Therefore, the prior art needs to be further developed. Utility Model Content

[0006] The purpose of the utility model is to overcome the above technical deficiencies and provide a motor structure to solve the technical problem in the related art that the motor structure is easily damaged when being installed.

[0007] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: a motor structure is provided, including: a cylinder, which has an installation cavity; a stator component, which is arranged in the installation cavity and is connected to the cylinder; a connecting cavity is arranged in the stator component; a rotor component, which is passed through the connecting cavity; a bearing support, which is connected to the stator component; a thrust bearing, which is connected to the bearing support; a positioning component, which has a first positioning portion fixedly connected to the bearing support and a second positioning portion abutting against the rotor component, so as to limit the relative movement of the rotor component and the stator component.

[0008] Furthermore, the positioning component comprises: a mounting groove, in which the rotor component is inserted; a second positioning portion is arranged on a side wall of the mounting groove; and a first positioning portion is arranged around the mounting groove.

[0009] Furthermore, a first mounting hole is provided on the second positioning portion, a second mounting hole is provided on the bearing support, and the motor structure further comprises a fastener, which is inserted into the first mounting hole and the second mounting hole.

[0010] Furthermore, there are a plurality of first mounting holes, and the plurality of first mounting holes are arranged around the mounting groove; there are a plurality of second mounting holes, and the plurality of second mounting holes are arranged in one-to-one correspondence with the plurality of first mounting holes.

[0011] Furthermore, the rotor component includes a thrust plate, the thrust bearing includes a main thrust bearing and an auxiliary thrust bearing, the main thrust bearing is connected to the auxiliary thrust bearing; there is an installation gap between the main thrust bearing and the auxiliary thrust bearing, and the thrust plate is inserted in the installation gap.

[0012] Furthermore, the rotor component includes a first shaft segment and a second shaft segment connected to each other, the outer diameter of the first shaft segment is larger than the outer diameter of the second shaft segment; the thrust plate is arranged on the first shaft segment; the mounting groove includes a first mounting groove for accommodating the first shaft segment and a second mounting groove for accommodating the second shaft segment, the first mounting groove is connected to the second mounting groove, and a limit platform is provided between the first mounting groove and the second mounting groove; the second positioning portion is located on the inner wall of the second mounting groove.

[0013] Furthermore, the second mounting groove is located on a side of the first mounting groove away from the thrust plate; there is an installation space between the bottom of the second mounting groove and the rotor component, and a lifting hole is provided on the positioning component, one end of the lifting hole is connected to the bottom of the second mounting groove, and the other end of the lifting hole is connected to the outside of the second mounting groove.

[0014] Furthermore, a bearing installation cavity is provided between the bearing support and the rotor component, and the motor structure also includes a radial bearing, the inner ring of the radial bearing is connected to the rotor component, and the outer ring of the radial bearing is connected to the bearing support.

[0015] Furthermore, the thrust bearing is located inside the installation cavity; the positioning component has a connecting flange, the connecting flange is penetrated into the bearing installation cavity, and the connecting flange abuts against the radial bearing.

[0016] Furthermore, the motor structure also includes a guide block, which is connected to an end of the rotor component away from the positioning component, and the guide block has a protective groove for inserting the end of the rotor component.

[0017] Beneficial effects:

[0018] The motor structure of the utility model avoids rotor damage and thrust plate deformation, and ensures to the greatest extent that the size, shape and position tolerance and surface roughness of the assembled rotor are consistent with those after machining, thereby improving the assembly efficiency and operation reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the motor structure adopted in the embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of another embodiment of the motor structure adopted in the embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the positioning component of the motor structure adopted in the embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of the internal structure of the positioning component of the motor structure adopted in the embodiment of the utility model;

[0023] Figure 5 It is a structural schematic diagram of a guide block of a motor structure provided by an embodiment of the utility model;

[0024] Figure 6 It is a schematic diagram of the internal structure of the guide block of the motor structure provided by an embodiment of the utility model.

[0025] The above drawings include the following reference numerals:

[0026] 1. Cylinder; 11. Mounting cavity; 2. Stator component; 3. Rotor component; 31. Thrust plate; 301. First shaft section; 302. Second shaft section; 4. Bearing support; 41. Second mounting hole; 5. Thrust bearing; 51. Main thrust bearing; 52. Auxiliary thrust bearing; 6. Positioning component; 61. First positioning portion; 62. Second positioning portion; 621. First mounting hole; 63. Mounting groove; 631. First mounting groove; 632. Second mounting groove; 6321. Groove bottom; 633. Lifting hole; 634. Mounting space; 65. Limiting platform; 66. Connecting flange; 7. Mounting gap; 8. Radial bearing; 9. Guide block; 91. Protective groove. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figures 1 to 6 According to an embodiment of the utility model, a motor structure is provided, including: a cylinder 1, wherein the cylinder 1 has an installation cavity 11; a stator component 2, which is arranged in the installation cavity 11 and connected to the cylinder 1; a connection cavity is arranged in the stator component 2; a rotor component 3, wherein the rotor component 3 is inserted into the connection cavity; a bearing support 4, which is connected to the stator component 2; a thrust bearing 5, which is connected to the bearing support 4; and a positioning component 6, wherein the positioning component 6 has a first positioning portion 61 fixedly connected to the bearing support 4 and a second positioning portion 62 abutting against the rotor component 3, so as to limit the relative movement of the rotor component 3 and the stator component 2. With the above arrangement, the relative movement of the rotor component 3 and the stator component 2 is limited by the positioning component 6. When the motor structure is installed, the positioning component 6 bears the magnetic attraction between the stator component 2 and the rotor component 3 and the gravity of each component, thereby avoiding the damage and deformation of the rotor component 2, and solving the technical problem in the related art that the structure of the motor is easily damaged when it is installed.

[0029] In the motor structure of this embodiment, see Figure 4 The positioning component 6 includes: a mounting groove 63, in which the rotor component 3 is inserted; a second positioning portion 62 is arranged on the side wall of the mounting groove 63; and a first positioning portion 61 is arranged around the mounting groove 63. In this way, the rotor component 3 can be prevented from moving in the axial direction, thereby avoiding collision with the rotor component 3.

[0030] See also Figure 4 In the motor structure of this embodiment, a first mounting hole 621 is provided on the second positioning portion 62, a second mounting hole 41 is provided on the bearing support 4, and the motor structure also includes a fastener, which is inserted into the first mounting hole 621 and the second mounting hole 41.

[0031] In order to make the installation of the positioning component 6 more secure, in the motor structure of this embodiment, see Figure 4 There are multiple first mounting holes 621 , and the multiple first mounting holes 621 are arranged around the mounting groove 63 . There are multiple second mounting holes 41 , and the multiple second mounting holes 41 are arranged one-to-one correspondingly to the multiple first mounting holes 621 .

[0032] In the motor structure of this embodiment, the rotor component 3 includes a thrust plate 31, and the thrust bearing 5 includes a main thrust bearing 51 and an auxiliary thrust bearing 52, and the main thrust bearing 51 is connected to the auxiliary thrust bearing 52; there is an installation gap 7 between the main thrust bearing 51 and the auxiliary thrust bearing 52, and the thrust plate 31 is inserted in the installation gap 7.

[0033] Specifically, the bearing support 4 abuts against the thrust bearing 5 , so that the thrust plate 31 and the bearing support 4 tighten the bearing, thereby making the motor structure more solid.

[0034] In the motor structure of this embodiment, see Figure 1 The rotor component 3 includes a first shaft segment 301 and a second shaft segment 302 that are connected to each other, and the outer diameter of the first shaft segment 301 is larger than the outer diameter of the second shaft segment 302; the thrust plate 31 is arranged on the first shaft segment 301; the mounting groove 63 includes a first mounting groove 631 for accommodating the first shaft segment 301 and a second mounting groove 632 for accommodating the second shaft segment 302, the first mounting groove 631 is connected to the second mounting groove 632, and a limiting platform 65 is provided between the first mounting groove 631 and the second mounting groove 632; the second positioning portion 62 is located on the inner wall of the second mounting groove 632.

[0035] Specifically, the matching section of the rotor component 3 and the positioning component 6 (i.e., the second positioning portion 62) is close to the end face side of the rotor component 3, where the inclination is the largest. The positioning component 6 is clamped here, which is equivalent to having a bearing here. This minimizes the inclination of the rotor component 3 and avoids the thrust surface of the thrust plate 31 being subjected to force.

[0036] In the motor structure of this embodiment, see Figure 4 The second mounting groove 632 is located on the side of the first mounting groove 631 away from the thrust plate 31; there is a mounting space 634 between the groove bottom 6321 of the second mounting groove 632 and the rotor component 3, and a lifting hole 633 is provided on the positioning component 6, one end of the lifting hole 633 is connected to the groove bottom 6321 of the second mounting groove 632, and the other end of the lifting hole 633 is connected to the outside of the second mounting groove 632. In this way, the installation of the rotor component 3 is facilitated.

[0037] See also Figure 1 In the motor structure of this embodiment, a bearing installation cavity 11 is provided between the bearing support 4 and the rotor component 3, and the motor structure further comprises a radial bearing 8, the inner ring of the radial bearing 8 is connected to the rotor component 3, and the outer ring of the radial bearing 8 is connected to the bearing support 4. In this way, the rotor component 3 and the bearing support 4 can rotate relative to each other.

[0038] In the motor structure of this embodiment, the thrust bearing 5 is located inside the mounting cavity 11; the positioning component 6 has a connecting flange 66, which is inserted into the bearing mounting cavity 11 and abuts against the radial bearing 8. In this way, the bearing installation is more stable.

[0039] In the motor structure of this embodiment, the motor structure further includes a guide block 9 , which is connected to one end of the rotor component 3 away from the positioning component 6 , and has a protective groove 91 for inserting the end of the rotor component 3 .

[0040] Specifically, the guide block 9 is made of polytetrafluoroethylene, which cooperates with the other end surface of the rotor component 3. The outer diameter of the guide block 9 is more than 1 mm smaller than the inner diameter of the motor stator. It is locked on the rotor component 3 through a threaded hole and cooperates with the positioning component 6 to avoid collision when the shaft is inserted.

[0041] Specifically, see Figure 1 When the thrust bearing 5 is located inside the installation cavity 11, when it is assembled into the shaft, the first step is to assemble the positioning component 6 and the bearing support 4 together and lock them; the second step is to install the main thrust bearing 5 on the support; the third step is to install the rotor component 3 with the thrust plate 31 into the bearing support 4 and the positioning component 6; the fourth step is to install the auxiliary thrust bearing 5; the fifth step is to lock the polytetrafluoroethylene guide block with the other end of the rotor component 3; the sixth step is to start vertically inserting the shaft through the lifting hole on the end face of the positioning component 6. At this time, there will be a magnetic attraction to make the rotor component 3 deviate to one side, but the polytetrafluoroethylene guide block acts as a guide. Effect: After the shaft is inserted, the bearing support 4 is locked with the cylinder. At this time, whether it is assembled vertically or horizontally, when the magnetic attraction and gravity cause the rotor component 3 to tilt, the force is on the positioning component 6. In addition, the lifting hole must be on the positioning component 6, not on the rotor component 3. If the lifting hole is on the positioning component 6, when the shaft is inserted vertically, the bearing force is the dead weight of the rotor component 3 and the thrust plate 31. However, if the lifting hole is on the rotor component 3, the bearing force is the weight of the rotor component 3, the thrust plate 31, the bearing support 4 and the positioning component 6 together, which may be too large and exceed the maximum load of the foil bearing.

[0042] Specifically, see Figure 2 If the thrust plate 31 is outside the installation cavity 11, the first step is to install the auxiliary thrust bearing 5 on the bearing support 4, the second step is to install the rotor component 3 with the thrust plate 31 into the bearing support 4, the third step is to install the main thrust bearing 5, and the fourth step is to lock the positioning component 6 with the support. The fifth step is to lock the polytetrafluoroethylene guide block with the other end of the rotor component 3; the sixth step is to start vertically inserting the shaft through the lifting hole on the end face of the positioning component 6.

[0043] During disassembly and assembly, first install the positioning component 6 into the support with the thrust bearing 5, then remove the bearing support 4 on the other side, and then pull out the rotor component 3 vertically, and then disassemble it in the reverse order of the previous steps.

[0044] Embodiment 1:

[0045] The positioning component 6 of the motor structure of this embodiment is as follows Figure 3 , Figure 4 As shown, it consists of three parts: an outer ring, an inner ring and a lifting hole 633. The outer ring and the bearing support 4 are positioned by a stopper and locked by a screw hole. The inner ring cooperates with the rotor component 3 to play a supporting and limiting role when the rotor component 3 tilts due to gravity or magnetic attraction. The lifting hole 633 is a through hole with a size of M10 or above and a thread depth of 15 mm or above. It is used for lifting during vertical assembly and disassembly. If the hole is too small or the thread depth is too shallow, the safety of the lifting assembly cannot be guaranteed.

[0046] Embodiment 2:

[0047] The motor structure of this embodiment has requirements on the matching accuracy between the positioning component 6, the bearing support 4 and the rotor component 3, involving dimensional tolerance and shape and position tolerance;

[0048] Requirements for the bearing support 4: The perpendicularity T1 between the stop of the bearing support 4 and the surface on which the thrust bearing 5 is mounted should be less than 1 thread;

[0049] Requirements for the positioning component 6: The coaxiality between the second mounting groove 632 and the connecting flange 66 is within 1 thread;

[0050] Requirements for clearance fit: See Figure 1 , the gap between the connecting flange 66 and the bearing support 4 is a2, the gap between the second mounting groove 632 and the rotor component 3 is a1, the gap between the main thrust bearing 51 and the auxiliary thrust bearing 52 of the thrust bearing 5 is z1, and the relationship between a1, a2 and z1 is a1=a2<0.3z1. If a1 and a2 are greater than 0.3z1, the cumulative error may be too large, causing the thrust plate 31 to be attached to the bearing and subjected to force, but there is still a gap between the second mounting groove 632 of the positioning component 6 and the rotor component 3, and the limiting effect cannot be achieved;

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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. A motor structure, characterized in that: include: A cylinder (1), wherein the cylinder (1) has a mounting cavity (11); A stator component (2) is arranged in the installation cavity (11), and the stator component (2) is connected to the cylinder (1); a connecting cavity is arranged in the stator component (2); A rotor component (3), wherein the rotor component (3) is disposed in the connecting cavity; A bearing support (4) connected to the stator component (2); A thrust bearing (5) connected to the bearing support (4); A positioning component (6), the positioning component (6) comprising a first positioning portion (61) fixedly connected to the bearing support (4) and a second positioning portion (62) abutting against the rotor component (3) to limit relative movement between the rotor component (3) and the stator component (2).

2. The motor structure according to claim 1, characterized in that: The positioning component (6) comprises: A mounting groove (63), wherein the rotor component (3) is inserted into the mounting groove (63); the second positioning portion (62) is arranged on a side wall of the mounting groove (63); and the first positioning portion (61) is arranged around the mounting groove (63).

3. The motor structure according to claim 2, characterized in that: The second positioning portion (62) is provided with a first mounting hole (621), the bearing support (4) is provided with a second mounting hole (41), and the motor structure further comprises a fastener, which is inserted into the first mounting hole (621) and the second mounting hole (41).

4. The motor structure according to claim 3, characterized in that: There are a plurality of first mounting holes (621), and the plurality of first mounting holes (621) are arranged around the mounting groove (63); there are a plurality of second mounting holes (41), and the plurality of second mounting holes (41) are arranged in a one-to-one correspondence with the plurality of first mounting holes (621).

5. The motor structure according to claim 2, characterized in that: The rotor component (3) includes a thrust plate (31), and the thrust bearing (5) includes a main thrust bearing (51) and an auxiliary thrust bearing (52), wherein the main thrust bearing (51) is connected to the auxiliary thrust bearing (52); an installation gap (7) is provided between the main thrust bearing (51) and the auxiliary thrust bearing (52), and the thrust plate (31) is inserted into the installation gap (7).

6. The motor structure according to claim 5, characterized in that: The rotor component (3) comprises a first shaft segment (301) and a second shaft segment (302) which are connected to each other, and the outer diameter of the first shaft segment (301) is larger than the outer diameter of the second shaft segment (302); the thrust plate (31) is arranged on the first shaft segment (301); the mounting groove (63) comprises a first mounting groove (631) for accommodating the first shaft segment (301) and a second mounting groove (632) for accommodating the second shaft segment (302), the first mounting groove (631) is connected to the second mounting groove (632), and a limiting platform (65) is provided between the first mounting groove (631) and the second mounting groove (632); the second positioning portion (62) is located on the inner wall of the second mounting groove (632).

7. The motor structure according to claim 6, characterized in that: The second mounting groove (632) is located on a side of the first mounting groove (631) away from the thrust plate (31); an installation space (634) is provided between the groove bottom (6321) of the second mounting groove (632) and the rotor component (3); a lifting hole (633) is provided on the positioning component (6), one end of the lifting hole (633) is connected to the groove bottom (6321) of the second mounting groove (632), and the other end of the lifting hole (633) is connected to the outside of the second mounting groove (632).

8. The motor structure according to claim 1, characterized in that: A bearing mounting cavity (11) is provided between the bearing support (4) and the rotor component (3), and the motor structure further comprises a radial bearing (8), an inner ring of the radial bearing (8) being connected to the rotor component (3), and an outer ring of the radial bearing (8) being connected to the bearing support (4).

9. The motor structure according to claim 8, characterized in that: The thrust bearing (5) is located inside the mounting cavity (11); the positioning component (6) has a connecting flange (66), the connecting flange (66) is inserted into the bearing mounting cavity (11), and the connecting flange (66) abuts against the radial bearing (8).

10. The motor structure according to any one of claims 1 to 9, characterized in that: The motor structure further comprises a guide block (9), the guide block (9) being connected to an end of the rotor component (3) away from the positioning component (6), and the guide block (9) having a protective groove (91) for inserting an end of the rotor component (3).

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