A motor for a refrigerator compressor

Abstract

The application relates to a motor of a refrigerator compressor and relates to the technical field of compressor motors. The motor comprises a stator, a rotor used in cooperation with the stator and a framework connected with the stator; the stator comprises a plurality of iron core punching sheets stacked up and down, each of the iron core punching sheets is in a cylindrical shape; the framework comprises a supporting ring located at the bottom of the stator and at least one mounting foot connected with the supporting ring and located outside the outer ring of the stator. Compared with the prior art, the iron core punching sheet in the application file is short of a mounting angle, the material width of the iron core punching sheet is reduced, the consumption of silicon steel sheets is reduced, and the cost is reduced; meanwhile, the framework is connected with the crankcase.

Description

Technical Field

[0001] This application relates to the technical field of compressor motors, and more particularly to a motor for a refrigerator compressor. Background Technology

[0002] The refrigerator compressor is the core component of the refrigeration system. Its main function is to draw in low-temperature, low-pressure refrigerant gas, compress it into high-temperature, high-pressure gas, and then discharge it to the condenser, thereby driving the entire refrigeration cycle. Mid- to high-end refrigerators commonly use inverter compressors, which is the mainstream trend in the market.

[0003] The motor is a key component inside the compressor. The motor mainly consists of a stator, a rotor, and terminals. The stator is made of laminated silicon steel sheets with coils wound with copper or aluminum enameled wire embedded on it. The stator is connected to the crankcase inside the compressor. The rotor is also made of laminated silicon steel sheets and has copper bars and short-circuit rings cast on it, forming a squirrel-cage structure. The rotating magnetic field of the stator cuts the copper bars on the rotor, generating an induced current, which in turn generates a magnetic field. The terminals connect the internal motor windings to the external circuit.

[0004] In related technologies, see Figure 1 The silicon steel sheets of the stator include an integrally formed lamination body and mounting corners. The lamination body has holes for the rotor to pass through. There can be two, three or four mounting corners. Each mounting corner is punched with a fixing hole for a mounting screw. Several mounting corners are located around the lamination body and are arranged at intervals.

[0005] Regarding the aforementioned technologies, the increased installation angle of the stator increases the area of ​​the silicon steel sheets, making the overall weight of the stator heavier. Summary of the Invention

[0006] In order to reduce the consumption of silicon steel sheets and lighten the weight of the stator, this application provides a motor for a refrigerator compressor.

[0007] The motor for a refrigerator compressor provided in this application adopts the following technical solution:

[0008] A refrigerator compressor motor includes a stator, a rotor that cooperates with the stator, and a frame connected to the stator; the stator includes a plurality of stacked iron core laminations, each of the iron core laminations being cylindrical;

[0009] The frame includes a support ring located at the bottom of the stator and at least one mounting foot connected to the support ring and located outside the outer ring of the stator.

[0010] By adopting the above technical solution, the iron core lamination in this application has fewer installation angles and a smaller material width compared to the previous version, thereby reducing the consumption of silicon steel sheets and lowering costs; at the same time, it connects the frame to the crankcase.

[0011] Optionally, the height of the mounting foot is lower than the height of the stator.

[0012] By adopting the above technical solution, the crankcase of a fixed-frequency compressor and the crankcase of a variable-frequency compressor are generally two different specifications of materials. The main difference lies in the connecting column of the crankcase. The motor of the variable-frequency compressor in this application connects to the connecting column of the crankcase by mounting feet, breaking away from the conventional approach, so that the crankcase of a fixed-frequency compressor can also be used in the technical solution of this application, reducing material management.

[0013] Optionally, a winding aid is provided on the end face of the stator near the crankcase, and part of the winding aid enters the crankcase.

[0014] By adopting the above technical solution, since the height of the mounting feet is lower than the height of the stator, after the connecting column of the crankcase is connected to the mounting feet, the winding auxiliary parts of the stator can enter the crankcase to a certain extent, minimizing the gap between the stator and the crankcase, thereby reducing the overall height of the compressor. In addition, after the gap between the stator and the crankcase is reduced, the crankshaft of the crankcase also needs to be shortened to fit the stator, thereby reducing the overall weight of the compressor and reducing costs.

[0015] Optionally, two, three, or four mounting feet are provided, and a plurality of mounting feet are spaced apart around the stator.

[0016] By adopting the above technical solution, the crankcase of the variable frequency compressor generally has two, three or four connecting columns, and the number of mounting feet corresponds to this, so that the motor can be adapted to both variable frequency compressors and fixed frequency compressors.

[0017] Optionally, the frame has screw holes at the mounting feet, and the mounting feet are recessed at the screw holes to form a gasket mounting groove.

[0018] By adopting the above technical solution, the mounting foot is recessed at the screw hole to form a washer mounting groove, which facilitates the subsequent placement of washers for use with screws at the mounting foot.

[0019] Optionally, the rotor includes an iron core body with a stepped hole in the middle and a plurality of magnets wound around the iron core body, wherein the upper end face of the iron core body is lower than the upper end face of the magnets.

[0020] By adopting the above technical solution, the crankcase has a protrusion with a through hole through which the crankshaft passes. When the protrusion is coaxially inserted into the stepped hole, the crankshaft also passes into the through hole, allowing the crankshaft to be inserted into the rotor. In practice, the protrusion has a thicker bottom or is equipped with reinforcing ribs. As mentioned earlier, the gap between the stator and the crankcase is reduced. If it is still installed in the original way, after the protrusion extends into the rotor, the thicker part of the protrusion's bottom or the reinforcing ribs will abut against the iron core body, generating friction when the rotor rotates.

[0021] This application reduces the amount of silicon steel sheets in the core body while keeping the magnet sheet unchanged. Specifically, it lowers the height of the core body, making the upper surface of the core body lower than the upper surface of the magnet sheet, so that the protrusions will not rub against the core body. This reduces the consumption of silicon steel sheets and lightens the weight of the compressor.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The crankcases of fixed-frequency compressors and variable-frequency compressors are two different types of materials. The main difference lies in the connecting column of the crankcase. The motor of the variable-frequency compressor in this application connects to the connecting column of the crankcase by mounting feet, which breaks away from the conventional approach and allows the crankcase of the fixed-frequency compressor to be used in the technical solution of this application, reducing material management.

[0024] 2. Since the height of the mounting feet is lower than that of the stator, after the crankcase connecting column is connected to the mounting feet, the stator winding auxiliary parts can enter the crankcase to a certain extent, minimizing the gap between the stator and the crankcase, thereby reducing the overall height of the compressor. In addition, after the gap between the stator and the crankcase is reduced, the crankshaft of the crankcase also needs to be shortened to fit the stator, thereby reducing the overall weight of the compressor and reducing costs.

[0025] 3. This application reduces the amount of silicon steel sheets in the core body while keeping the magnet sheet unchanged. That is, it lowers the height of the core body and makes the upper surface of the core body lower than the upper surface of the magnet sheet, so that the protrusion will not rub against the core body. In this way, the consumption of silicon steel sheets is reduced and the weight of the compressor is reduced. Attached Figure Description

[0026] Figure 1 This is a top view of the lamination body in the background art of this application.

[0027] Figure 2 This is a schematic diagram of the structure of the crankcase after it is connected to the electronics in an embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the rotor inserted into the stator in an embodiment of this application.

[0029] Figure 4 This is a top view of the core lamination in the embodiments of this application.

[0030] Figure 5 This is a schematic diagram of the skeleton connected to the stator in an embodiment of this application.

[0031] Figure 6 This is a schematic diagram of the crankcase in an embodiment of this application.

[0032] Figure 7 This is a schematic diagram of the skeleton structure in the embodiments of this application.

[0033] Figure 8 This is a structural schematic diagram of the skeleton from another perspective in an embodiment of this application.

[0034] Figure 9 This is a schematic diagram of the rotor structure in an embodiment of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Crankcase; 11. Connecting column; 12. Protruding column; 13. Reinforcing rib; 2. Stator; 21. Iron core lamination; 22. Winding auxiliary component; 3. Rotor; 31. Iron core body; 32. Magnet sheet; 33. Stepped hole; 4. Frame; 41. Support ring; 42. Mounting foot; 43. Screw hole; 44. Mounting groove; 5. Lamination body; 6. Mounting angle; 7. Fixing hole. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] This application discloses a motor for a refrigerator compressor.

[0038] See Figure 2 In this embodiment, the refrigerator compressor is an inverter compressor. The compressor includes a motor and a crankcase 1. The crankcase 1 has a connecting column 11. The motor is connected to the connecting column 11 of the crankcase 1, and the crankshaft inside the crankcase 1 extends into the rotor 3 of the motor.

[0039] Reference Figures 3 to 5 The refrigerator compressor motor includes a stator 2, a rotor 3 and a frame 4. The stator 2 and rotor 3 work together, and the frame 4 is connected to the stator 2 and connected to the crankcase 1.

[0040] Specifically, the stator 2 includes multiple stacked core laminations 21 (not shown in the diagram due to their dense stacking). The core laminations 21 are made of silicon steel sheets, and each core lamination 21 is cylindrical. Compared to the previous core laminations 21, the mounting angle 6 is reduced, and the material width of the core laminations 21 is decreased, thereby reducing the consumption of silicon steel sheets and lowering costs.

[0041] A winding auxiliary component 22 is provided on the end face of the stator 2 near the crankcase 1. The winding auxiliary component 22 is coaxially arranged with the stator 2. The coil of the stator 2 is wound on the winding auxiliary component 22. The winding auxiliary component 22 is connected to the stator 2 through the wound coil, so that the coil is higher than the stator 2.

[0042] See Figures 5 to 8 The frame 4 includes a support ring 41 and mounting feet 42. The mounting feet 42 are fixed to or integrally connected to the outer ring of the support ring 41. The frame 4 is made of metal or plastic; if it is plastic, the material is polybutylene terephthalate. The mounting feet 42 are located outside the outer ring of the stator 2. The mounting feet 42 can abut against the outer ring of the stator 2 or have a certain gap with it. In this embodiment, the mounting feet 42 abut against the outer ring of the stator 2, making the connection between the frame 4 and the stator 2 more stable. When the frame 4 is installed, the support ring 41 is coaxial with the stator 2, and the support ring 41 is attached to the lower end face of the stator 2. The mounting feet 42 are located outside the outer ring of the stator 2 and abut against it. The coils of the stator 2 are also wound on the support ring 41.

[0043] The number of mounting feet 42 can be two, three, four or more. Generally, four mounting feet 42 are set, and the four mounting feet 42 are set around the stator 2 at equal intervals. If there are other numbers of mounting feet 42, the setting is similar.

[0044] The height of mounting foot 42 is lower than the height of stator 2, meaning the upper surface of mounting foot 42 is lower than the upper surface of stator 2. Mounting foot 42 has screw holes 43, and the mounting foot 42 is recessed at the screw holes 43 to form a washer mounting groove 44, facilitating the placement of washers for screws at mounting foot 42 later. When the motor is connected to crankcase 1, the connecting post 11 of crankcase 1 abuts against mounting foot 42, and then screws are inserted into screw holes 43 to connect the frame 4 and crankcase 1, thereby fixing the position of stator 2.

[0045] Generally, the crankcase 1 of a fixed-frequency compressor and the crankcase 1 of a variable-frequency compressor are made of two different specifications of materials. The main difference lies in the connecting column 11 of the crankcase 1. In this application, the motor of the variable-frequency compressor is connected to the connecting column 11 of the crankcase 1 via mounting foot 42, breaking away from conventional thinking. This allows the crankcase 1 of a fixed-frequency compressor to also be used in the technical solution of this application, reducing material management. At the same time, since the height of mounting foot 42 is lower than the height of stator 2, when the connecting column 11 of the crankcase 1 is connected to mounting foot 42, the winding auxiliary component 22 of stator 2 can enter the crankcase 1 to a certain extent, minimizing the gap between stator 2 and crankcase 1, thereby reducing the overall height of the compressor. In addition, after the gap between stator 2 and crankcase 1 is reduced, the crankshaft of crankcase 1 also needs to be shortened to fit stator 2, thereby reducing the overall weight of the compressor and reducing costs.

[0046] See Figure 9 The rotor 3 includes an iron core body 31 and magnet plates 32. The iron core body 31 is made of stacked silicon steel sheets, with a stepped hole 33 in the middle, through which the crankshaft of the crankcase 1 passes. Several magnet plates 32 are arranged around and attached to the outer ring of the iron core body 31 at intervals. The crankcase 1 has a protrusion 12 with a through hole through which the crankshaft passes. When the protrusion 12 is coaxially inserted into the stepped hole 33, the crankshaft also passes into the through hole, thus inserting the crankshaft into the rotor 3.

[0047] The actual protrusion 12 has a thicker bottom or is equipped with a reinforcing rib 13. As mentioned earlier, the gap between the stator 2 and the crankcase 1 has been reduced. If it is still installed in the original way, after the protrusion 12 extends into the rotor 3, the thicker part of the bottom of the protrusion 12 or the reinforcing rib 13 will abut against the iron core body 31 and generate friction when the rotor 3 rotates.

[0048] To solve this problem, this application reduces the silicon steel sheet of the core body 31 while keeping the magnet sheet 32 ​​unchanged. Specifically, it lowers the height of the core body 31 (by 10-20 mm), and the upper surface of the core body 31 is lower than the upper surface of the magnet sheet 32, so that the protrusion 12 will not rub against the core body 31. This reduces the consumption of silicon steel sheets and lightens the weight of the compressor.

[0049] The implementation principle of a refrigerator compressor motor according to an embodiment of this application is as follows: the stator 2 is pre-assembled, the auxiliary winding component and the frame 4 are installed on the stator 2, and the coil is wound; when the motor is connected to the crankcase 1, the rotor 3 is inserted into the stator 2, and the installation of the frame 4 corresponds to the connecting post 11 of the crankcase 1. At this time, the protrusion 12 of the crankcase 1 passes into the stator 2, and finally the screw is screwed into the screw hole 43, and the mounting foot 42 is connected to the crankcase 1 by the screw.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor for a refrigerator compressor, characterized in that: It includes a stator (2), a rotor (3) used in conjunction with the stator (2), and a frame (4) connected to the stator (2); the stator (2) includes a plurality of stacked iron core laminations (21), each of the iron core laminations (21) being cylindrical; The frame (4) includes a support ring (41) located at the bottom of the stator (2) and at least one mounting foot (42) connected to the support ring (41) and located outside the outer ring of the stator (2).

2. The motor of the refrigerator compressor according to claim 1, characterized in that: The height of the mounting foot (42) is lower than the height of the stator (2).

3. The motor of the refrigerator compressor according to claim 1, characterized in that: The stator (2) is provided with a winding auxiliary component (22) on the end face near the crankcase (1), and part of the winding auxiliary component (22) enters the crankcase (1).

4. The motor of the refrigerator compressor according to claim 1, characterized in that: The mounting feet (42) are provided in two, three or four, and a plurality of the mounting feet (42) are spaced apart around the stator (2).

5. The motor of the refrigerator compressor according to claim 1, characterized in that: The frame (4) has screw holes (43) at the mounting feet (42), and the mounting feet (42) sink down at the screw holes (43) to form a gasket mounting groove (44).

6. The motor of the refrigerator compressor according to claim 1, characterized in that: The rotor (3) includes an iron core body (31) with a stepped hole (33) in the middle and a plurality of magnet pieces (32) wound around the iron core body (31). The upper end face of the iron core body (31) is lower than the upper end face of the magnet pieces (32).

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