CN213185662U - Rotor for variable frequency motor and compressor using variable frequency motor - Google Patents

Abstract

The utility model discloses a rotor for inverter motor, including rotor and bent axle, the rotor is the integrated into one piece casting structure with the bent axle, makes as a part, has saved the technology that the bent axle was impressed to electric motor rotor: the integral structure of the crankshaft and the rotor is adopted, so that the working procedures of the compressor can be reduced, the manufacturing cost of the compressor can be reduced, the waste of the working procedure of pressing the motor rotor into the crankshaft can be reduced, the problems of the increase of the air gap lower rate of the compressor caused by the coaxiality variation after the rotor is pressed into the crankshaft by force and the like can be solved, the structure is simple, the cost can be reduced by about 10%, and the integral structure can be widely popularized in the motor manufacturing industry of the compressor. The utility model discloses still disclose an use this inverter motor's compressor.

Description

Rotor for variable frequency motor and compressor using variable frequency motor

Technical Field

The utility model relates to a compressor technical field especially relates to an inverter motor rotor structure for compressor, specifically is a compressor that is used for inverter motor's rotor and uses this inverter motor.

Background

In recent years, the application ratio of the variable frequency motor in the compressor industry is higher and higher. The variable frequency motor of the electric appliance such as a refrigerator, an air conditioner and the like has a rapidly growing potential, but the cost requirement of the motor is higher and higher, wherein the rotor of the variable frequency motor is a core part of the variable frequency motor, and the cost of the rotor of the variable frequency motor generally exceeds more than 40% of the total cost of the motor, so that the reduction of the cost of the rotor of the variable frequency motor becomes a research focus.

At present, a general compressor structure is provided with a crankshaft, a stator and a rotor are specially manufactured for a motor, and then the rotor is sleeved on the crankshaft. In the prior art, a motor rotor needs to be pressed into a crankshaft, and the process scheme of pressing the rotor into the crankshaft is that the motor rotor is cold-pressed or hot-sleeved on the crankshaft, so that the work waste is large; in addition, the existing technical scheme also has the problems of high air gap lower rate of the compressor caused by coaxiality variation after the rotor is forcibly pressed into the crankshaft and the like. In addition to the foregoing problems, the stator and the rotor used in the prior art are both made of silicon steel sheets, which results in a large amount of silicon steel sheets for the motor, and the cost of the inverter motor is difficult to reduce.

Chinese special for 2012, 12 th and 26 th, publication No. CN202628530U discloses a rotary compressor, which comprises a crankshaft and a motor rotor, wherein the crankshaft comprises an eccentric portion, and a short shaft and a long shaft respectively located at two ends of the eccentric portion, the motor rotor is cooperatively arranged on the long shaft, the long shaft is a stepped shaft and has a first shaft section engaged with an inner hole of the motor rotor, a first end of the first shaft section has a stepped surface engaged with an end of the motor rotor, and a second end of the first shaft section has a threaded portion; and the first shaft section is also provided with a circumferential fixing piece for circumferentially fixing the motor rotor. This patent has realized motor rotor's connection of dismantling through nut and circumference mounting, and motor rotor and the bent axle connection of having solved the connection of heat jacket mode can lead to the problem that the part warp after dismantling, have reduced the worker and have abandoned, but still have because of the rotor powerful impresses the compressor air gap rate of inserting that the axiality variation leads to behind the bent axle increases the scheduling problem to and the great higher problem of motor cost that leads to of silicon steel sheet quantity.

Chinese special benefit of publication No. CN208461566U, 2019, 2 month 1, discloses a rotary electric machine rotor, comprising: the rotor core comprises a first punching sheet and a second punching sheet, the first punching sheet and the second punching sheet are superposed in the axial direction of the rotor core, the rotor core is provided with a rotating shaft hole which is through along the axial direction of the rotor core, the rotor core is provided with a plurality of magnet grooves which are arranged at intervals along the circumferential direction of the rotor core, and magnetic parts are arranged in the magnet grooves; one of the first punching sheet and the second punching sheet is provided with an opening, and the opening is positioned between the rotating shaft hole and the magnet groove in the radial direction of the rotor core. This patent is through being equipped with the opening on one of them in first punching sheet and the second punching sheet, reduces the deformation problem of axle heat sleeve in-process rotor core, but still exists because of the powerful compressor air gap rate that leads to of the variation of axiality increases scheduling problem behind the bent axle of impressing of rotor to and the great motor cost's that leads to of silicon steel sheet quantity problem higher.

Therefore, in order to reduce the manufacturing cost of compressor, improve the competitiveness of compressor, the utility model provides an electric motor rotor does not adopt the current technological scheme that the bent axle was impressed to the rotor to reduce the silicon steel sheet quantity.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a rotor for a variable frequency motor and a compressor using the variable frequency motor, wherein the rotor and a crankshaft adopt an integrated structure, and the process of pressing the motor rotor into the crankshaft is omitted; meanwhile, the rotor is made of non-silicon steel sheets, so that the using amount of the silicon steel sheets is reduced, and the cost of the compressor motor is further reduced.

The utility model discloses a realize through following technical scheme:

a rotor for a variable frequency motor comprises a rotor and a crankshaft, wherein the rotor and the crankshaft are integrally formed into a cast structural part; the rotor comprises a central shaft hole which can accommodate a crankshaft to pass through, a boss is arranged at one end of the central shaft hole, which is far away from the variable frequency motor, the boss is of a convex structure which protrudes from the inner peripheral surface of the rotor in the radial direction in the opposite direction, and the inner wall of the boss is abutted against the outer wall of the crankshaft and is integrally formed;

the crankshaft comprises a long shaft, a shaft shoulder and a short shaft, the short shaft is fixed on the shaft shoulder, and one end of the shaft shoulder, which is far away from the short shaft, is fixedly connected with the long shaft; the outer wall of the shaft body of the long shaft close to the shaft shoulder can be integrally formed with the inner wall of the rotor inner boss.

Among the above-mentioned technical scheme, rotor and bent axle integrated into one piece make as a part, have saved the technology that motor rotor impresses the bent axle: the integral structure of the crankshaft and the rotor is adopted, so that the working procedures of the compressor can be reduced, the manufacturing cost of the compressor can be reduced, the waste of the working procedure of pressing the motor rotor into the crankshaft can be reduced, the problems of the increase of the air gap lower rate of the compressor caused by the coaxiality variation after the rotor is pressed into the crankshaft by force and the like can be solved, the structure is simple, the cost can be reduced by about 10%, and the integral structure can be widely popularized in the motor manufacturing industry of the compressor.

As a further technical scheme, a first oil hole and a second oil hole are formed in the inner wall of the cavity of the long shaft, a spiral oil groove is formed in the outer surface of the long shaft, and the spiral oil groove starts from the first oil hole and ends at the second oil hole in the outer wall of the long shaft.

As a further technical scheme, a third oil hole is formed in the side wall of the short shaft, and an oil duct is formed between the third oil hole and the second oil hole.

According to a further technical scheme, a fourth oil hole is formed in the end portion of the short shaft, and an oil duct is formed between the fourth oil hole and the third oil hole.

As a further technical scheme, a linear oil groove is formed in the side wall of the short shaft, starts from the third oil hole and ends at the end of the short shaft.

As a further technical scheme, a clamping groove is formed in the end part, far away from the shaft shoulder, of the long shaft and used for clamping the oil suction pipe.

As a further technical scheme, the rotor is made of non-silicon steel sheets. The rotor and the crankshaft can be made of cast iron or common steel and are integrally formed by a die-casting process.

As a further technical scheme, a plurality of convex ribs are arranged on the outer side wall of the rotor and are matched with grooves in the magnetic blocks. The positions, corresponding to the convex ribs, of the magnetic blocks are provided with grooves, and when the magnetic blocks are fixed to the outer side wall of the rotor, the magnetic blocks are fixed in an inserting or sticking mode. Set up the recess on the fixed surface of magnetic path body, can guarantee the magnetic path and the bonding back of rotor lateral wall, because the cooperation of recess and bead, consequently make and to remain a certain amount of glue between magnetic path and the rotor lateral wall, and then improve the retentivity of magnetic path, promoted the cohesion of magnetic path and rotor lateral wall.

As a further technical scheme, a balance weight is arranged on one side of the shaft shoulder. The balance block is arranged, so that energy conservation and noise reduction can be realized, and the running power of the compressor is reduced.

The utility model also provides a technical scheme specifically does: a compressor uses an inverter motor having the rotor.

Compared with the prior art, the beneficial effects of the utility model reside in that:

(1) the utility model discloses rotor and bent axle integrated into one piece make as a part, have saved the technology that electric motor rotor impresses bent axle: the integral structure of the crankshaft and the rotor is adopted, so that the working procedures of the compressor can be reduced, the manufacturing cost of the compressor can be reduced, the waste of the working procedure of pressing the motor rotor into the crankshaft can be reduced, the problems of the increase of the air gap lower rate of the compressor caused by the coaxiality variation after the rotor is pressed into the crankshaft by force and the like can be solved, the structure is simple, the cost can be reduced by about 10%, and the integral structure can be widely popularized in the motor manufacturing industry of the compressor.

(2) The utility model discloses a non-silicon steel sheet preparation rotor for example adopts cast iron or ordinary steel to make rotor and bent axle to adopt die-casting technology integrated into one piece with rotor and bent axle. On the premise of not influencing the performance of the compressor, the manufacturing cost is reduced.

(3) The utility model is provided with a convex edge on the outer side wall of the rotor, a groove is arranged on the magnetic block corresponding to the convex edge, and the magnetic block is fixed on the outer side wall of the rotor by means of splicing or pasting; set up the recess on the fixed surface of magnetic path body, can guarantee the magnetic path and the bonding back of rotor lateral wall, because the cooperation of recess and bead, consequently make and to remain a certain amount of glue between magnetic path and the rotor lateral wall, and then improve the retentivity of magnetic path, promoted the cohesion of magnetic path and rotor lateral wall.

Drawings

Fig. 1 is a schematic structural view of a rotor and a crankshaft integrally formed according to an embodiment of the present invention;

fig. 2 is a schematic view of a rotor structure according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a long shaft of a crankshaft according to an embodiment of the present invention;

fig. 4 is a schematic view of a crankshaft short shaft according to an embodiment of the present invention.

In the figure: 1. a rotor; 101. a rib; 102. a boss; 2. a long axis; 201. a card slot; 202. a first oil hole; 203. A second oil hole; 204. a helical oil groove; 3. a minor axis; 301. a third oil hole; 302. a fourth oil hole; 303. a linear oil groove; 4. a shaft shoulder; 401. a balance weight.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

Referring to fig. 1 to 4, the present embodiment provides a rotor for a variable frequency motor, including a rotor 1 and a crankshaft, where the rotor 1 and the crankshaft are an integrally formed cast structural member; the rotor 1 comprises a central shaft hole capable of accommodating a crankshaft to pass through, a boss 102 is arranged at one end of the central shaft hole, which is far away from the variable frequency motor, the boss 102 is a protruding structure protruding from the inner peripheral surface of the rotor 1 in the radial direction, and the inner wall of the boss 102 is abutted against the outer wall of the crankshaft and is integrally formed; the crankshaft comprises a long shaft 2, a shaft shoulder 4 and a short shaft 3, the short shaft 3 is fixed on the shaft shoulder 4, and one end, far away from the short shaft 3, of the shaft shoulder 4 is fixedly connected with the long shaft 2; the outer wall of the long shaft 2 close to the shaft shoulder 4 can be integrally formed with the inner wall of the boss 102 in the rotor 1.

The rotor 1 and the crankshaft assembly are formed in one step by a die casting process, a metal mold is designed according to the requirements of a product drawing, and molten metal fills a cavity at high pressure and high speed, is formed and solidified at high pressure. Rotor 1 and bent axle integrated into one piece make as a part, have saved the technology that motor rotor 1 impresses the bent axle: the integral structure of the crankshaft and the rotor 1 is adopted, so that the working procedures of the compressor can be reduced, the manufacturing cost of the compressor can be reduced, the waste of the working procedure of pressing the motor rotor 1 into the crankshaft can be reduced, the problems that the air gap lower line rate of the compressor is increased due to the coaxiality variation after the rotor 1 is pressed into the crankshaft by force and the like can be solved, the structure is simple, the cost can be reduced by about 10%, and the integral structure can be widely popularized in the motor manufacturing industry of the compressor.

In this embodiment, the inner wall of the cavity of the long shaft 2 is provided with a first oil hole 202 and a second oil hole 203, the outer surface of the long shaft 2 is provided with a spiral oil groove 204, and the spiral oil groove 204 extends from the first oil hole 202 to the second oil hole 203 on the outer wall of the long shaft 2.

A third oil hole 301 is formed in the side wall of the stub shaft 3, and an oil passage is formed between the third oil hole 301 and the second oil hole 203. A fourth oil hole 302 is formed at the end of the stub shaft 3, and an oil passage is formed between the fourth oil hole 302 and the third oil hole 301. The side wall of the short shaft 3 is provided with a linear oil groove 303, and the linear oil groove 303 starts from the third oil hole 301 and ends at the end of the short shaft 3.

The end part of the long shaft 2, which is far away from the shaft shoulder 4, is provided with a clamping groove 201 for clamping an oil suction pipe, and the other end of the oil suction pipe is fixed at the center of the rotor 1.

One side of the shaft shoulder 4 is provided with a balance weight 401. The balance block 401 is arranged to save energy and reduce noise, and the running power of the compressor is reduced.

The outer side wall of the rotor 1 is provided with a plurality of ribs 101, and the ribs 101 are matched with grooves in the magnetic blocks. The magnetic block is provided with a groove at a position corresponding to the convex rib 101, and when the magnetic block is fixed on the outer side wall of the rotor 1, the magnetic block is fixed in an inserting or sticking mode. Set up the recess on the fixed surface of magnetic path body, can guarantee the magnetic path and the bonding back of rotor 1 lateral wall, because the cooperation of recess and bead 101, consequently make and to remain a certain amount of glue between magnetic path and the rotor 1 lateral wall, and then improve the retentivity of magnetic path, promoted the cohesion of magnetic path and rotor 1 lateral wall.

Example 2

Unlike embodiment 1, the present embodiment provides a rotor 1, in which the rotor 1 and the crankshaft assembly are made of cast iron, and the rotor 1 and the crankshaft assembly are integrally formed by a die-casting process. The performance of the inverter compressor using the cast iron rotor 1 was tested and the results are shown in table 1:

as can be seen from table 1, under the same condition, the material of the inverter motor rotor 1 is replaced by cast iron, which has less influence on the performance of the compressor, and cast iron can be used to replace silicon steel sheets to manufacture the motor rotor 1, thereby reducing the cost of the compressor.

Example 3

The present embodiment provides a compressor using an inverter motor having a rotor 1. The rotor 1 comprises a rotor 1 and a crankshaft, and the rotor 1 and the crankshaft are integrally formed. The compressor adopting the rotor 1 can be used without specially manufacturing a crankshaft, so that the process of pressing the motor rotor 1 into the crankshaft is omitted, the working procedures of the compressor are reduced, the labor waste of the working procedure of pressing the motor rotor 1 into the crankshaft is reduced, and the problems of high air gap lower rate of the compressor caused by coaxiality variation after the rotor 1 is pressed into the crankshaft by force are solved.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The rotor for the variable frequency motor is characterized by comprising a rotor and a crankshaft, wherein the rotor and the crankshaft are integrally formed casting structural parts; the rotor comprises a central shaft hole which can accommodate a crankshaft to pass through, a boss is arranged at one end of the central shaft hole, which is far away from the variable frequency motor, the boss is of a convex structure which protrudes from the inner peripheral surface of the rotor in the radial direction in the opposite direction, and the inner wall of the boss is abutted against the outer wall of the crankshaft and is integrally formed;

the crankshaft comprises a long shaft, a shaft shoulder and a short shaft, the short shaft is fixed on the shaft shoulder, and one end of the shaft shoulder, which is far away from the short shaft, is fixedly connected with the long shaft; the outer wall of the shaft body of the long shaft close to the shaft shoulder can be integrally formed with the inner wall of the rotor inner boss.

2. The rotor for an inverter motor according to claim 1, wherein a first oil hole and a second oil hole are formed in an inner wall of the cavity of the long shaft, and a spiral oil groove is formed in an outer surface of the long shaft, and the spiral oil groove starts from the first oil hole and ends at the second oil hole in an outer wall of the long shaft.

3. The rotor for an inverter motor according to claim 2, wherein a third oil hole is opened in a side wall of the stub shaft, and an oil passage is opened between the third oil hole and the second oil hole.

4. The rotor for an inverter motor according to claim 3, wherein a fourth oil hole is opened at an end of the stub shaft, and an oil passage is opened between the fourth oil hole and the third oil hole.

5. The rotor for an inverter motor according to claim 4, wherein the side wall of the stub shaft is opened with a linear oil groove, and the linear oil groove starts from the third oil hole and ends at the end of the stub shaft.

6. The rotor for the variable frequency motor according to claim 1, wherein a clamping groove is formed in an end portion, away from the shaft shoulder, of the long shaft and used for clamping the oil suction pipe.

7. The rotor for the variable frequency motor according to claim 1, wherein the rotor is made of a non-silicon steel sheet.

8. The rotor for the variable frequency motor according to claim 1, wherein the outer side wall of the rotor is provided with a plurality of ribs, and the ribs are matched with the grooves on the magnetic blocks.

9. The rotor for a variable frequency motor according to claim 1, wherein a balance weight is provided at one side of the shoulder.

10. A compressor, characterized in that it uses an inverter motor having a rotor according to any one of claims 1-9.

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