Fixed-frequency variable-rotating-speed compressor and refrigeration equipment

Abstract

The utility model discloses a fixed-frequency variable-rotating-speed compressor and refrigeration equipment, and belongs to the field of refrigeration. The fixed-frequency variable-rotating-speed compressor comprises a shell, a motor, an air cylinder and a lubricating assembly. A lubricating oil pool is arranged in the shell; the motor is arranged above the lubricating oil pool and comprises a stator, a rotor and a crankshaft; the air cylinder is connected with the stator, and the air cylinder is in dynamic coupling connection with the crankshaft; the lubricating assembly comprises an oil pipe and an oil core, the oil pipe and the oil core extend into the motor from the lubricating oil pool, the oil pipe is connected with the rotor or the crankshaft, the oil core and / or the oil pipe are / is provided with a spiral groove, and the oil core is arranged in the oil pipe in a sleeved mode. According to the fixed-frequency variable-rotation-speed compressor, the lubricating assembly in a spiral oil feeding mode is arranged, so that the conveying height of lubricating oil can be increased, and a stator stack thickness large structure can be effectively lubricated under the working condition that the fixed-frequency variable-rotation-speed compressor runs at a low speed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigeration, and particularly relates to a fixed-frequency variable-speed compressor and a refrigeration device. BACKGROUND

[0002] The compressor is a core component of the refrigeration system of a refrigerator, a freezer or the like, and provides power for the refrigeration cycle by compressing refrigerant to maintain a low-temperature environment of the refrigeration device. The working state of the compressor directly affects the refrigeration effect and energy consumption level of the refrigeration device.

[0003] At present, most refrigeration devices use a compressor running at a fixed frequency and speed, and the motor efficiency in the compressor is low, which is difficult to match different operating conditions of the refrigeration device. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a fixed-frequency variable-speed compressor and a refrigeration device, which can lubricate the friction parts under the low-speed and high-speed operating states of the fixed-frequency variable-speed compressor.

[0005] In a first aspect, the present application provides a fixed-frequency variable-speed compressor, comprising:

[0006] A housing, wherein a lubricating oil pool is arranged in the housing;

[0007] A motor, wherein the motor is arranged above the lubricating oil pool, and the motor comprises a stator, a rotor and a crankshaft;

[0008] A cylinder, wherein the cylinder is connected with the stator and is power-coupled with the crankshaft;

[0009] A lubricating assembly, comprising an oil pipe and an oil core, wherein the oil pipe and the oil core extend into the motor from the lubricating oil pool, the oil pipe is connected with the rotor or the crankshaft, the oil core and / or the oil pipe is provided with a spiral groove, and the oil core is sleeved on the oil pipe.

[0010] According to the fixed-frequency variable-speed compressor of the present application, the lubricating assembly in the spiral oil feeding mode can improve the height of lubricating oil delivery, and effectively lubricate the stator with a large thickness structure under the low-speed operating condition of the fixed-frequency variable-speed compressor.

[0011] According to an embodiment of the present application, the oil core and the oil pipe are gap-fitted, and the gap d between the outer wall of the oil core and the inner wall of the oil pipe satisfies: 0.05mm≤d≤0.25mm; and / or,

[0012] The spiral angle θ of the spiral groove satisfies: 10°≤θ≤60°.

[0013] According to one embodiment of the present application, the oil core and the oil pipe are in interference fit.

[0014] According to one embodiment of the present application, a rotor of the motor is arranged in the stator, the crankshaft is fixedly connected with the rotor, and the crankshaft is provided with an oil passage hole;

[0015] According to one embodiment of the present application, the oil pipe is connected with the crankshaft, one end of the oil pipe is located in the oil passage hole, and the other end of the oil pipe extends out of the oil passage hole and is immersed in the lubricating oil pool.

[0016] h / H=λ, 0.4≤λ≤1.6 is satisfied, wherein h is the length of the oil core, and H is the stack thickness of the stator core of the stator; and / or,

[0017] The distance L from the bottom of the oil core to the bottom end surface of the stator satisfies: L≥6mm.

[0018] According to one embodiment of the present application, the fixed-speed variable-speed compressor further comprises a limiting piece, the limiting piece is connected with the oil core, and is connected with the stator and / or the shell.

[0019] According to one embodiment of the present application, the fixed-speed variable-speed compressor further comprises a first assembly piece and a second assembly piece, the first assembly piece and the second assembly piece are connected with the stator, and the limiting piece is connected with the first assembly piece and the second assembly piece.

[0020] According to one embodiment of the present application, the first assembly piece and the second assembly piece are both provided with mounting holes, and the limiting piece is connected with the mounting holes;

[0021] The stator comprises a stator core and a stator connecting rod, and the first assembly piece and the second assembly piece are connected with the stator core and / or the stator connecting rod, respectively.

[0022] According to one embodiment of the present application, the stator comprises a stator core, the stator core comprises a plurality of stator laminations, a first connecting part and a second connecting part, the first connecting part and the second connecting part are arranged on a stator yoke part of at least one stator lamination, and the first connecting part and the second connecting part are symmetrically distributed; and two ends of the limiting piece are connected with the first connecting part and the second connecting part, respectively.

[0023] The first connecting part and the second connecting part are both mounting holes, and the stator yoke part is provided with the mounting holes.

[0024] In a second aspect, the present application provides a refrigeration equipment comprising the fixed-speed variable-speed compressor according to any one of the above.

[0025] According to the refrigeration equipment provided in the present application, by arranging the fixed-frequency variable-speed compressor of any one of the above, the fixed-frequency variable-speed compressor is provided with a lubricating assembly in a spiral oil feeding mode, the height of lubricating oil delivery can be improved, and the stator with a large thickness structure can be effectively lubricated under the low-speed operation condition of the fixed-frequency variable-speed compressor.

[0026] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0028] Figure 1 is one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0029] Figure 2 is another one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0030] Figure 3 is a third one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0031] Figure 4 is a fourth one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0032] Figure 5 is a fifth one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0033] Figure 6 is a sixth one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0034] Figure 7 is a seventh one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0035] Figure 8 is an eighth one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0036] Figure 9 is a ninth one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0037] Figure 10 is a tenth one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0038] Figure 11 is an eleventh one of the structural schematic diagrams of the fixed-frequency variable-speed compressor provided in the embodiments of the present application;

[0039] Figure 12 is one of the related parameter relationship diagrams of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0040] Figure 13 is the second related parameter relationship diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0041] Figure 14 is the third related parameter relationship diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0042] Figure 15 is the twelfth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0043] Figure 16 is the thirteenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0044] Figure 17 is the fourteenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0045] Figure 18 is the fifteenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0046] Figure 19 is the sixteenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0047] Figure 20 is the seventeenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0048] Figure 21 is the eighteenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application;

[0049] Figure 22 is the nineteenth structure schematic diagram of the fixed-frequency variable-speed compressor provided by the embodiment of the present application.

[0050] Reference signs:

[0051] The refrigeration equipment 1000;

[0052] The fixed-frequency variable-speed compressor 100;

[0053] The stator core 11, the stator lamination 111, the stator yoke 1111, the arc-shaped wall 11111, the connecting hole 11112, the stator tooth 1112, the stator slot 1113, the stator connecting rod 112, the inner tangent circle of the outer wall 113;

[0054] The first assembly 113, the first connecting part 1131, the second assembly 114, the second connecting part 1141, the first protruding part 115, the second protruding part 116, the third protruding part 117, and the mounting hole 118;

[0055] The stator winding 12;

[0056] The rotor core 13, the rotor lamination 131, the rotor slot 132, the arc segment 1321, and the straight segment 1322;

[0057] The crankshaft 14 and the oil passage 141;

[0058] The shell 15, the wiring board 151, the wiring end 1511, the mounting cavity 152, and the lubricating oil pool 1521;

[0059] The cylinder 16 and the input end 161;

[0060] The lubricating assembly 17, the oil pipe 171, the oil core 172, the helical groove 1721, the first limiting part 1722, and the limiting part 18. DETAILED DESCRIPTION

[0061] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0062] The following refers to Figures 1-22 The stator core 11, the stator, the motor, the variable-speed compressor 100, and the refrigeration device 1000 according to the embodiments of the present application are described.

[0063] It should be noted that the refrigeration device 1000 in the present embodiment can be understood as a general refrigeration storage device, including but not limited to a refrigerator, a freezer, a display cabinet, a beverage cabinet, a wine cabinet, a cold fresh cabinet, and a refrigeration vending machine, etc. The refrigeration device 1000 has various structural forms and a wide range of applications.

[0064] The refrigeration device 1000 includes a cabinet and a door body. The cabinet includes a shell, an inner container, and a thermal insulation layer between the shell and the inner container. The shell is arranged outside the inner container to provide protection. The thermal insulation layer can be a foaming layer to provide thermal insulation and buffering. A machine cabin is formed between the shell and the inner container, and is used to place machines such as a compressor and a circuit breaker.

[0065] At present, most of the compressors of the middle and low-end refrigeration equipment on the market are fixed frequency compressors, that is, the compressor is fixed at a speed of about 3000r / min when the input voltage is 220V and the frequency is 50Hz. Whether the refrigeration equipment is in a high load condition or a low load condition, the compressor works at this speed, resulting in high power consumption of the compressor, and the noise corresponding to this speed is also high (36-38dB), which needs to be improved.

[0066] Among them, the high load condition can be: the working temperature of the refrigerator is 30℃ or above, or the user puts a large amount of food, or the frequency of opening the door is high every day; the low load condition can be: the working temperature of the refrigerator is 25℃ or below, or a small amount of food is stored, or the frequency of opening the door is low every day.

[0067] The refrigeration equipment 1000 provided by the application can change the winding of the fixed frequency compressor to make the fixed frequency variable speed compressor 100 have two or more speeds of about 3000r / min (high speed) and about 1500r / min (low speed) under the condition that the input voltage is 220V and the frequency is 50Hz, and the size of the compressor does not change. The high speed and low speed of the fixed frequency variable speed compressor 100 correspond to the high load condition and low load condition of the refrigeration equipment 1000 respectively. When the refrigeration equipment 1000 is in the low load condition, the fixed frequency variable speed compressor 100 operates at low speed, the power consumption is greatly reduced, and the noise is also significantly reduced.

[0068] The fixed frequency variable speed compressor 100 provided by the application has multiple speeds, for example, the fixed frequency variable speed compressor 100 has a first target speed and a second target speed, and the first target speed is greater than the second target speed.

[0069] As shown in Figure 1 The fixed frequency variable speed compressor 100 provided by the application includes a shell 15, a motor, a cylinder 16 and a lubricating assembly 17. The motor, the cylinder 16 and the lubricating assembly 17 are all installed in the shell 15, and the lubricating assembly 17 is used for lubricating the friction parts in the motor and the cylinder 16.

[0070] The stator core 11 provided by the application includes multiple stator laminations 111 stacked in the axial direction.

[0071] As shown in Figure 2 The stator lamination 111 includes a stator yoke portion 1111 and multiple stator tooth portions 1112 with the same radial length. The multiple stator tooth portions 1112 are connected to the inner peripheral wall of the stator yoke portion 1111 and are arranged in a circumferential direction at intervals along the inner peripheral wall of the stator yoke portion 1111. The stator slots 1113 are formed between adjacent stator tooth portions 1112.

[0072] Several stator teeth 1112 are arranged circumferentially along the inner peripheral wall of the stator yoke 1111.

[0073] The stator teeth 1112 extend outward from the center of the stator laminations 111, forming a spoke-like structure. The stator teeth 1112 are used to support the stator windings 12 and provide a magnetic flux path.

[0074] The multiple stator slots 1113 have the same dimensions; in other words, the multiple stator teeth 1112 have the same radial length; that is, any two adjacent stator slots 1113 have the same radial dimension.

[0075] In related technologies, the stator core 11 of a fixed-frequency compressor is affected by the size and structure of the stator laminations, resulting in varying sizes of the stator slots 1113.

[0076] This application sets the stator slots 1113 to the same structure, which can increase the slot depth of the stator slots 1113, thereby increasing the wire diameter of the winding conductors, reducing copper losses, and improving motor efficiency.

[0077] The stator yoke 1111 is the annular part on the stator lamination 111 that connects the various stator teeth 1112.

[0078] Among them, such as Figure 2 As shown, the stator core 11 satisfies: 0.3≤W / (Rr)≤0.9, where W is the groove depth of the stator slot 1113, R is the radius of the inscribed circle 113 of the outer wall of the stator core 11, and r is the inner diameter of the stator.

[0079] For example, W / (Rr) can be 0.3, 0.5, 0.7, 0.8 or 0.9.

[0080] According to the stator core 11 provided in the embodiments of this application, by setting the ratio between the stator slot 1113 and the stator yoke 1111, the cross-sectional area for the flow of magnetic lines of force can be increased, the degree of magnetic field saturation can be reduced, thereby improving the efficiency of the motor.

[0081] In actual verification, the motor efficiency of this application can be increased from 60.9% to 65.7%.

[0082] In some embodiments, such as Figure 2 As shown, the outer peripheral wall of the stator yoke 1111 of the stator core 11 includes at least one set of oppositely arranged arc-shaped walls 11111. The arc-shaped walls 11111 on the outer peripheral wall of the stator yoke 1111 can optimize the distribution of magnetic flux and improve the electromagnetic performance of the motor.

[0083] The curved wall 11111 may include one or more pairs.

[0084] Exemplarily, the arc-shaped walls 11111 can be oppositely arranged on opposite sides of the stator core 11; or two pairs of arc-shaped walls 11111 are oppositely arranged on two opposite sides of the stator core 11.

[0085] The circumferential angle of the arc-shaped wall 11111 corresponds to at least two stator slots 1113, and the midpoint of the bottom of the at least two stator slots 1113 in the circumferential angle region of the arc-shaped wall 11111 is radially away from the outer wall of the stator yoke 1111 by the same distance.

[0086] In other words, the connection points of the plurality of stator tooth portions 1112 connected to the stator yoke 1111 in the circumferential angle region of the arc-shaped wall 11111 are radially away from the outer wall of the stator yoke 1111 by the same distance.

[0087] In this embodiment, the resistance encountered by the magnetic flux at any point on the region of the stator yoke 1111 corresponding to the arc-shaped wall 11111 is the same, which improves the uniformity of the magnetic flux distribution.

[0088] It can be understood that the outer diameter of the stator core 11 remains unchanged, and when the slot depth of the stator slot 1113 is increased, the effective cross-sectional area of the magnetic flux flowing through the outer wall of the stator yoke 1111 is reduced, and magnetic field saturation is prone to occur.

[0089] According to the stator core 11 provided in the embodiments of the present application, by including the oppositely arranged arc-shaped walls 11111 on the outer wall of the stator yoke 1111, and setting the proportional relationship between the stator slot 1113 and the stator yoke 1111, the cross-sectional area of the magnetic flux flow can be increased, and the degree of magnetic field saturation can be reduced, thereby improving the efficiency of the motor.

[0090] In some embodiments, as shown in FIG. 1B, the plurality of connection points of the plurality of stator tooth portions 1112 connected to the stator yoke 1111 form a circular array concentric with the arc-shaped wall 11111, which can improve the utilization rate of the stator core 11 and improve the efficiency of the motor. Figure 2

[0091] In other words, the plurality of stator slot bottoms 1113 away from the center of the stator yoke 1111 form a circular array concentric with the arc-shaped wall 11111.

[0092] In other words, the inner wall of the stator yoke 1111 is concentric with the arc-shaped wall 11111.

[0093] In other words, the midpoints of the bottoms of the plurality of stator slots 1113 are located on the same target circle concentric with the arc-shaped wall 11111.

[0094] ​In this embodiment, the symmetry and stability of the stator core 11 structure can be improved, and the uniformity of the stator teeth 1112 distributed on the stator yoke 1111 is enhanced, thereby optimizing the magnetic flux path and improving the electromagnetic performance of the motor. Simultaneously, this arrangement also helps to strengthen the mechanical strength of the stator core 11, enabling it to withstand greater electromagnetic forces and mechanical stresses.

[0095] In some embodiments, such as Figure 2 As shown, the groove depth W of the stator groove 1113 satisfies: 8mm≤W≤30mm. For example, the groove depth W of the stator groove 1113 can be 8mm, 10mm, 15mm, 16.5mm, 17.5mm, 19mm, or 20mm.

[0096] As shown in Table 1, with the same inner diameter of the stator core 11, increasing the slot depth of the stator slot 1113 from 11.53 mm to 17.5 mm can increase the wire diameter of the stator winding 12, reduce copper loss, and improve motor efficiency.

[0097] Table 1 Stator Data

[0098] Stator slot 1113 slot depth Stator core 11 inner diameter Stator winding 12 wire diameter Motor efficiency (finite element simulation data) 11.53 mm 52.05 mm 0.340 mm 60.9％ 17.5 mm 52.05 mm 0.455 mm 65.73％

[0099] In some embodiments, such as Figure 2 As shown, the radial distance D from the bottom of the stator slot 1113 to the outer peripheral wall of the stator yoke 1111 satisfies: 3mm≤D≤15mm.

[0100] For example, D can be 3mm, 5mm, 8.5mm, 10mm, 12mm or 15mm.

[0101] In this embodiment, by setting the radial distance from the bottom of the stator slot 1113 to the outer peripheral wall of the stator yoke 1111, the utilization rate of the stator core 11 can be improved and the motor efficiency can be increased.

[0102] For example, stator slot 1113 is a flat-bottomed slot or a pear-shaped slot.

[0103] In some embodiments, the stator slot 1113 is a flat-bottomed slot. When the number of stator slots 1113 is small and the stator width-to-depth ratio is large, using a flat-bottomed slot can effectively increase the slot area, improve the utilization rate of the stator core, and enhance the motor efficiency.

[0104] In some embodiments, such as Figure 2 As shown, the stator yoke 1111 is provided with a connecting hole 11112, and the multiple connecting holes 11112 of the multiple stator laminations 111 are aligned.

[0105] The stator core 11 further comprises a plurality of stator connecting rods 112, each of which is connected with the connecting hole 11112 at the same position on each stator sheet 111 in sequence to fix the plurality of stator sheets 111 in an axial stacking manner.

[0106] The stator connecting rod 112 can be a stator bolt, and the stator is connected with the cylinder 16 through the stator connecting rod 112.

[0107] The stator connecting rod 112 and the corresponding connecting hole 11112 can be connected through insertion, threaded connection or the like.

[0108] In some embodiments, as shown in Figure 2 Each stator yoke portion 1111 is provided with a plurality of connecting holes 11112, which are distributed in a circumferential direction of the stator sheet 111, and the plurality of connecting holes 11112 at the same position of the plurality of stator sheets 111 are aligned in an axial direction, so that the plurality of stator sheets 111 can be connected at multiple points, improving the stability of the connection.

[0109] In some embodiments, as shown in Figure 11 The stator yoke portion 1111 is provided with a mounting hole 118 for mounting the limiting piece 18.

[0110] The mounting hole 118 can be provided with a plurality of mounting holes, so that the limiting piece 18 and the stator yoke portion 1111 form a multi-point connection, increasing the stability of the connection.

[0111] The limiting piece 18 is used to limit the circumferential degree of freedom of the oil core 172 of the lubricating assembly 17, so as to limit the oil core 172 from moving during the rotation of the oil pipe 171 with the motor rotor, so that the oil core 172 moves relative to the oil pipe 171, and the lubricating oil in the oil pool 1521 rises along the oil path between the oil pipe 171 and the oil core 172 to the friction part.

[0112] The limiting piece 18 can be a suspension spring, a limiting frame or a limiting steel wire, etc.

[0113] The stator yoke portion 1111 of one or more of the plurality of stacked stator sheets 111 is provided with a mounting hole 118, or the stator yoke portion 1111 of one or more of the plurality of stacked stator sheets 111 is connected with an assembly part, and the assembly part is provided with a mounting hole 118.

[0114] The application further provides a stator, which comprises a stator winding 12 and the stator core 11 of any one of the above embodiments, and the stator core 11 is wound on the stator tooth portion 1112 of the stator core 11.

[0115] According to the stator provided in the embodiments of the present application, by arranging the stator core 11 of any one of the embodiments, the cross-sectional area of the magnetic flux circulation can be increased, the saturation degree of the magnetic field can be reduced, and thus the motor efficiency (60.9% to 65.7%) is improved. In some embodiments, the stator winding 12 includes a first coil portion and a second coil portion, and the number of pole pairs of the first coil portion and the second coil portion is different, so that the motor has a first target rotating speed and a second target rotating speed.

[0116] In the formula, the first target rotating speed and the second target rotating speed are different. For example, the first target rotating speed can be greater than the second target rotating speed, the first target rotating speed is high speed, and the second target rotating speed is low speed.

[0117] In the formula, the first coil portion can be designed to have a small number of pole pairs (for example, 2 poles or 4 poles) to achieve high speed. The second coil portion can be designed to have a large number of pole pairs (for example, 6 poles or 8 poles) to achieve low speed.

[0118] In specific use, when the motor needs to operate at the first target rotating speed, only the first coil portion is powered, and at this time, the motor will operate at the first target rotating speed. Because the number of pole pairs is small, the frequency of the rotating magnetic field is high, so that the rotor rotates at a fast speed.

[0119] When the motor needs to operate at the second target rotating speed, only the second coil portion is powered or both coil portions are powered but the current ratio is adjusted, and at this time, the motor will operate at the second target rotating speed. Because the number of pole pairs is large, the frequency of the rotating magnetic field is low, so that the rotor rotates at a slow speed.

[0120] According to the stator provided in the embodiments of the present application, by arranging the first coil portion and the second coil portion with different numbers of pole pairs, the motor can operate at the first target rotating speed or the second target rotating speed under the condition that the input voltage and frequency are unchanged. When the refrigeration capacity demand corresponds to a high load working condition, the refrigeration equipment 1000 can be controlled to operate at the first target rotating speed to meet the refrigeration demand and achieve rapid refrigeration. When the refrigeration capacity demand corresponds to a low load working condition, the refrigeration equipment 1000 can be controlled to operate at the second target rotating speed to achieve the refrigeration effect while effectively reducing the power consumption of the fixed-frequency variable-speed compressor 100 and significantly reducing the noise.

[0121] In some embodiments, the stator winding 12 is a double-layer winding design.

[0122] In the formula, each stator slot 1113 has upper and lower winding edges, and the upper edge and the lower edge in the stator slot 1113 are insulated.

[0123] In the embodiment, the stator winding 12 adopts a double-layer winding arrangement, has large unit volume output and good performance, can more fully utilize the space in the stator slot 1113 without changing the size of the compressor, thereby increasing the number of turns and the cross-sectional area of the wire of the winding, improving the electromagnetic performance of the motor, reducing energy loss, and improving the efficiency of the variable speed compressor 100.

[0124] In some embodiments, the end of the stator winding 12 does not protrude from the housing 15.

[0125] In the embodiment, the size of the end of the stator winding 12 is controlled during winding to be the same as or similar to that of the parent compressor before improvement, so that the size of the cylinder 16 does not change, the structure size of the cylinder 16 does not need to be redesigned and manufactured, the cylinder 16 can be universal, and the cost of the variable speed compressor 100 is not increased.

[0126] In some embodiments, the first coil part and the second coil part are connected in series, and the number of outgoing heads can be reduced.

[0127] In the embodiment, the start end and the end end of the first coil part and the second coil part are connected together in opposite order. When current passes through the coil parts, the magnetic fields generated by the coil parts will cancel each other out or enhance each other.

[0128] In a conventional commutation method connection, each coil part needs an independent outgoing head to be connected to an external circuit. After the stator winding 12 of the application is connected in reverse series, the first coil part and the second coil part are directly connected, and some outgoing taps can be omitted, thereby simplifying the wiring structure of the motor.

[0129] The person skilled in the art can select commutation series or reverse series according to actual needs.

[0130] The embodiment of the application also provides a motor, which comprises a rotor and the stator in any of the above embodiments, the rotor is arranged in the stator, and the sizes of the plurality of rotor slots 132 of the rotor core 13 of the rotor are the same.

[0131] According to the motor provided by the embodiment of the application, on the one hand, the stator in any of the above embodiments is arranged, and on the other hand, the first coil part and the second coil part with different pole pairs can be arranged, so that the motor can run at the first target speed or the second target speed under the condition that the input voltage and frequency are unchanged. In the embodiment, the plurality of rotor slots 132 of the rotor lamination 131 are of the same structure, the slot depth of the rotor slot 132 can be increased, and the efficiency of the motor can be improved.

[0132] In some embodiments, the rotor comprises a rotor core 13 and a rotor winding, the rotor core 13 comprises a plurality of rotor laminations 131 stacked in the axial direction. As Figure 3As shown, the rotor lamination 131 includes a plurality of rotor slots 132 arranged at intervals along the circumference, and the plurality of rotor slots 132 of the rotor lamination 131 have the same size.

[0133] In this embodiment, the multiple rotor slots 132 of the rotor lamination 131 have the same structure, which can increase the slot depth of the rotor slots 132 and improve the motor efficiency.

[0134] The rotor slot 132 includes two straight segments 1322 that are circumferentially distributed along the rotor lamination 131 and an arc segment 1321 that is radially arranged opposite each other. The radius of the arc segment 1321 closer to the center of the rotor lamination 131 is smaller than the radius of the arc segment 1321 farther from the center of the rotor lamination 131. The straight segments 1322 and the arc segments 1321 are arranged alternately.

[0135] The distance between the ends of any two adjacent straight segments 1322 of the rotor slot 132 that are close to the center of the rotor lamination 131 is less than the diameter of the arc segment 1321 with the smaller radius among the two arc segments 1321.

[0136] In other words, such as Figure 3 As shown, the distance between the ends of two adjacent straight segments 1322 of any two adjacent rotor slots 132 that are close to the center of the rotor lamination 131 is less than the diameter of the arc segment 1321 that is close to the center of the rotor lamination 131.

[0137] In this embodiment, by setting the distance between two adjacent straight segments 1322 of any two adjacent rotor slots 132, the shape of the rotor slots 132 can be optimized, the area ratio of the rotor slots 132 on the rotor laminations 131 can be increased, the electromagnetic performance of the motor can be improved, and noise reduction can be achieved.

[0138] In some embodiments, such as Figure 3 As shown, the radius of the arc segment 1321 near the center of the rotor lamination 131 is smaller than the radius of the arc segment 1321 away from the center of the rotor lamination 131, and the distance between two adjacent straight segments 1322 of any two adjacent rotor slots 132 increases monotonically from the direction near the center of the rotor lamination 131 to the direction away from the center of the rotor lamination 131.

[0139] In this embodiment, the ratio of the radius of the arc segment 1321 near the center of the rotor lamination 131 to the radius of the arc segment 1321 at the center of the rotor lamination 131 is close to 1, which further increases the area ratio of the rotor slot 132 on the rotor lamination 131, which can improve the electromagnetic performance of the motor and play a role in noise reduction.

[0140] In this embodiment, as Figure 3As shown, by optimizing the shape of the rotor slot 132, the total area of the rotor slot 132 can be increased, and the total area B of the rotor slot 132 is 1.1-2.1 times the total area A of the rotor slot in the related art.

[0141] In this embodiment, by optimizing the area ratio of the rotor slot 132 on the rotor lamination 131, the motor efficiency can be improved.

[0142] The rotor lamination 131 provided in the embodiments of the present application is applied to the fixed-frequency variable-speed compressor 100, and the rotor lamination 131 comprises: a rotor slot 132, the rotor slot 132 comprises a plurality of rotor slots 132 arranged at intervals along the circumferential direction of the rotor lamination 131, the rotor slot 132 comprises two arc segments 1321 distributed opposite to each other along the radial direction of the rotor lamination 131 and two straight line segments 1322 distributed opposite to each other along the circumferential direction of the rotor lamination 131, the central angle of the arc segment 1321 close to the center of the rotor lamination 131 is smaller than the central angle of the arc segment 1321 far from the center of the rotor lamination 131, and the average distance between the two straight line segments 1322 close to each other of any two adjacent rotor slots 132 is smaller than the diameter of the arc segment 1321 close to the center of the rotor lamination 131.

[0143] According to the rotor lamination 131 provided in the embodiments of the present application, the shape of the rotor slot 132 can be optimized, the area ratio of the rotor slot 132 on the rotor lamination 131 can be increased, and the electromagnetic performance of the motor can be improved to achieve the effect of noise reduction.

[0144] The fixed-frequency variable-speed compressor provided in the embodiments of the present application comprises the motor of any one of the above embodiments.

[0145] According to the fixed-frequency variable-speed compressor provided in the embodiments of the present application, by arranging the motor of any one of the above embodiments, the compressor can run at variable speed, and by optimizing the stator core 11 and the rotor core 13, the motor efficiency can be improved.

[0146] In the related art, an oil pipe is installed below the rotor of the fixed-frequency compressor, and a thin sheet is installed in the oil pipe. When the rotor is running (at this time, the speed is 300 r / min), the thin sheet disturbs the lubricating oil at the bottom of the compressor shell, and the lubricating oil is transmitted to the oil groove on the crankshaft under the action of centrifugal force, and then the lubricating oil lubricates the friction parts (cylinder and piston, crankshaft and connecting rod).

[0147] However, with the progress of science and technology, the speed of the fixed-frequency compressor is gradually increased, and the stator of the fixed-frequency compressor is thick. When the fixed-frequency compressor is running at low speed (about 1500 r / min), the centrifugal force is not enough to transport the lubricating oil to the friction part, and the friction part cannot be effectively lubricated, which needs to be improved.

[0148] Therefore, the application provides a lubricating assembly 17 in a spiral oiling mode.

[0149] In some embodiments, as shown in Figure 1 and Figure 4 , the shell 15 forms a mounting cavity 152, and a lubricating oil pool 1521 is arranged in the mounting cavity 152; the mounting cavity 152 has a sealing effect and can be used to accommodate the electrode, the cylinder 16 and the lubricating oil. The lubricating oil pool 1521 is located at the bottom end of the mounting cavity 152 in the height direction.

[0150] The motor is mounted in the mounting cavity 152, and the motor is located above the lubricating oil pool 1521 to avoid direct contact of the motor with the lubricating oil. The motor includes a stator, a rotor and the crankshaft 14.

[0151] The rotating part of the motor can include the rotor of the motor and the crankshaft 14.

[0152] The cylinder 16 is mounted in the mounting cavity 152, and the input end 161 of the cylinder 16 is power-coupled to the rotating part of the motor. For example, the cylinder 16 is power-coupled to the crankshaft 14, and the cylinder 16 and the stator can be bolted to achieve power transmission.

[0153] The lubricating assembly 17 includes an oil pipe 171 and an oil core 172, and the oil pipe 171 and the oil core 172 extend into the motor from the lubricating oil pool 1521, for example, can extend into the rotor core 13 or the crankshaft 14. The projection of the oil pipe 171 and the oil core 172 in the radial direction has an overlapping area with the projection of the rotor core 13 or the crank in the radial direction.

[0154] The oil pipe 171 is connected to the rotating part, and the oil pipe 171 is power-coupled to the rotor, or the oil pipe 171 is power-coupled to the crankshaft 14, or the oil pipe 171 is power-coupled to the rotor and the crankshaft 14, to achieve power transmission.

[0155] The oil core 172 and / or the oil pipe 171 are provided with a spiral groove 1721.

[0156] For example, the outer wall of the oil core 172 is provided with a spiral groove 1721, see Figure 1 and Figure 4 ; or the inner wall of the oil pipe 171 is provided with a spiral groove 1721, see Figure 16 and Figure 17 ; or the outer wall of the oil core 172 and the inner wall of the oil pipe 171 are both provided with a spiral groove 1721; or the oil core 172 is a hollow structure, and the inner wall of the oil core 172 is provided with a spiral groove 1721, see Figure 21 and Figure 22 ; or a threaded rod with an internal threaded groove is arranged between the oil core 172 and the oil pipe 171, and the oil core 172 is arranged in the inside of the threaded rod, see Figure 19 andFigure 20 .

[0157] In this embodiment, the outer wall of the oil core 172 is provided with a spiral groove 1721, and the oil path is formed between the inner wall of the oil pipe 171 and the spiral groove 1721 of the oil core 172; or the inner wall of the oil pipe 171 is provided with a spiral groove 1721, and the oil path is formed between the outer wall of the oil core 172 and the spiral groove 1721 of the oil pipe 171; or the outer wall of the oil core 172 and the inner wall of the oil pipe 171 are both provided with spiral grooves 1721, and in the case of corresponding arrangement of the spiral grooves 1721 of the oil core 172 and the oil pipe 171, one oil path is formed between the oil core 172 and the oil pipe 171, and in the case of staggered arrangement of the spiral grooves 1721 of the oil core 172 and the oil pipe 171, multiple oil paths are formed between the oil core 172 and the oil pipe 171; or the oil path is formed between the oil core 172 and the threaded rod.

[0158] When the motor rotates, the rotating part of the motor drives the oil pipe 171 to rotate through the power coupling connection. Because there is relative rotation between the oil pipe 171 and the oil core 172, and the oil path is formed between the inner wall of the oil pipe 171 and the spiral groove 1721 of the outer wall of the oil core 172, the lubricating oil can be driven by the spiral groove 1721 and rise along the oil path. The rising lubricating oil can lubricate the friction part of the motor, reduce friction and wear, and improve the operating efficiency and service life of the motor.

[0159] The friction part of the motor can be between the cylinder 16 and the piston, or between the crankshaft 14 and the connecting rod.

[0160] The shape and angle of the spiral groove 1721 can be adjusted according to the rotating speed, load and lubrication demand of the motor to achieve the best lubrication effect.

[0161] The oil core 172 is sleeved in the oil pipe 171, and the oil core 172 and the oil pipe 171 can at least include the following two cooperation modes:

[0162] First, the oil core 172 can be gap-fitted with the oil pipe 171.

[0163] In this embodiment, the oil pipe 171 is loosely sleeved on the oil core 172, and the outer wall of the oil core 172 and the inner wall of the oil pipe 171 are kept apart to improve the smoothness of the oil path and reduce the risk of blockage.

[0164] Referring to Figure 4 and Figure 17 , the outer wall of the oil core 172 or the inner wall of the oil pipe 171 is provided with a spiral rising spiral groove 1721, and the oil pipe 171 and the oil core 172 are relatively rotated and assembled to form an oil path between the inner wall of the oil pipe 171 and the oil core 172.

[0165] In some embodiments, as Figure 4As shown, the gap d between the inner wall of the oil pipe 171 and the outer wall of the oil core 172 satisfies: 0.05mm≤d≤0.25mm.

[0166] For example, d can be 0.05mm, 0.1mm, 0.15mm or 0.25mm.

[0167] The preferred gap d between the inner wall of the oil pipe 171 and the outer wall of the oil core 172 satisfies: 0.08mm≤d≤0.2mm.

[0168] For example, d can be 0.08mm, 0.1mm, 0.12mm or 0.2mm.

[0169] In this embodiment, by limiting the gap between the oil pipe 171 and the oil core 172, the stability of oiling the oil core 172 can be improved, and the impact of the actual production accuracy of the oil core 172 can be reduced.

[0170] Wherein, when a spiral groove is provided on the outer wall of the oil core 172, d is the gap between the top of the spiral groove of the oil core 172 and the inner wall of the oil pipe 171; when a spiral groove is provided on the inner wall of the oil pipe 171, d is the gap between the top of the spiral groove of the oil pipe 171 and the outer wall of the oil core 172.

[0171] like Figure 12 As shown, the amount of oil applied first increases and then decreases as the gap d between the oil pipe 171 and the oil core 172 increases. By taking the gap d between the oil pipe 171 and the oil core 172 to be between 0.08mm ≤ d ≤ 0.2mm, a good amount of oil can be maintained and the lubrication effect can be improved.

[0172] Secondly, the oil core 172 can be interference-fitted with the oil pipe 171.

[0173] Among them, the oil core 172 is dynamically coupled to the oil pipe 171, see [reference]. Figure 22 The oil core 172 has a hollow structure and an inner spiral groove 1721 is provided inside the oil core 172. The oil core 172 rotates with the rotation of the oil pipe 171, and the lubricating oil rises along the spiral groove 1721 as the oil core 172 rotates. The rising lubricating oil can lubricate the friction parts of the motor.

[0174] For example, the oil core 172 can be directly fixedly connected to the oil pipe 171, for example, the oil pipe 171 can be directly connected to the oil pipe 171 by any one or a combination of riveting, welding, and threaded connection; or, the oil core 172 can be indirectly fixedly connected to the oil pipe 171.

[0175] In this embodiment, since the oil core 172 is connected to the oil pipe 171, the oil core 172 does not need to be connected to the rotating part of the motor through the limiting member 18, thus simplifying the structure.

[0176] The cylinder 16 comprises a cylinder body, a piston and a connecting rod, two ends of the connecting rod are connected with the crankshaft 14 and the piston respectively, and the piston is designed to move in the cylinder body.

[0177] According to the fixed-frequency variable-speed compressor 100 provided in the application, the lubricating assembly 17 in the spiral oil feeding mode can improve the height of the lubricating oil delivery, and effectively lubricate the large structure of the stator stack under the low-speed operation condition of the fixed-frequency variable-speed compressor 100.

[0178] In some embodiments, as shown in Figure 4 The rising angle θ of the thread of the spiral groove 1721 satisfies: 10°≤θ≤60°,

[0179] For example, the rising angle θ of the thread of the spiral groove 1721 can be 10°, 20°, 35°, 40°, 55° or 60°.

[0180] Preferably, the rising angle θ of the thread of the spiral groove 1721 satisfies: 25°≤θ≤45°.

[0181] For example, the rising angle θ of the thread of the spiral groove 1721 can be 25°, 30° or 45°.

[0182] In the embodiment, by limiting the rising angle θ of the thread of the spiral groove 1721, the fixed-frequency variable-speed compressor 100 can achieve better lubrication at both the first target speed and the second target speed.

[0183] As shown in Figure 13 The solid line is the oil feeding amount at 1500 r / min, and the dashed line is the oil feeding amount at 3000 r / min. The oil feeding amount at 1500 r / min gradually decreases with the increase of the rising angle θ of the thread of the spiral groove 1721, and the oil feeding amount at 3000 r / min gradually increases with the increase of the rising angle θ of the thread of the spiral groove 1721. By setting the rising angle θ of the thread of the spiral groove 1721 to satisfy: 25°≤θ≤45°, better oil feeding amount can be provided at the motor speed of 1500 r / min and 3000 r / min.

[0184] In some embodiments, as shown in Figure 1 and Figure 4 The motor comprises a stator, a rotor and a crankshaft 14, the rotor is arranged in the stator, the rotor is installed on the crankshaft 14, the input end 161 of the cylinder 16 is power-coupled with the crankshaft 14, and the crankshaft 14 is provided with an oil passing hole 141.

[0185] The rotor is fixedly connected with the crankshaft 14.

[0186] The through hole 141 of the crankshaft 14 can extend in a direction away from the oil pool 1521, and the through hole 141 of the crankshaft 14 is connected to an oil passage of the lubricating assembly, so that the lubricating oil can lubricate the frictional parts such as the cylinder 16 and the piston, the crankshaft 14 and the connecting rod.

[0187] The crankshaft 14 serves as a power transmission part between the rotor and the cylinder 16, and the crankshaft 14 not only supports the rotor, but also transmits power to the cylinder 16 through the power coupling connection.

[0188] The oil pipe 171 is connected to the crankshaft 14 or the rotor, and one end of the oil pipe 171 is located in the through hole 141, and the other end of the oil pipe 171 extends out of the through hole 141 and is immersed in the oil pool 1521.

[0189] The input end 161 of the cylinder 16 is power-coupled to the crankshaft 14, and when the crankshaft 14 rotates, the cylinder 16 is driven to perform a corresponding working cycle (such as suction, compression, work, and exhaust).

[0190] In some embodiments, the oil pipe 171 is connected to the crankshaft 14, one end of the oil pipe 171 is located in the through hole 141, and the other end of the oil pipe 171 extends out of the through hole 141 and is immersed in the oil pool 1521. In this way, when the crankshaft 14 rotates, the oil pipe 171 rotates with it, and the oil wick 172 remains stationary. The oil wick 172 and the oil pipe 171 continuously draw lubricating oil through the end immersed in the oil pool 1521.

[0191] The lubricating oil drawn from the oil pool 1521 enters the inside of the crankshaft 14 through the oil pipe 171, and then enters the rotor or other parts that need to be lubricated through the through hole 141. With the rotation of the crankshaft 14, the lubricating oil is uniformly distributed on the surface that needs to be lubricated, achieving effective lubrication.

[0192] In some embodiments, as shown in Figure 1 , the bottom end of the oil wick 172 protrudes from the bottom end face of the stator winding 12 of the stator, and the bottom end of the oil wick 172 is immersed in the oil pool 1521.

[0193] In some embodiments, as shown in Figure 1 and Figure 4 , the fixed-frequency variable-speed compressor 100 satisfies h / H = λ, 0.4 ≤ λ ≤ 1.6; wherein h is the length of the oil wick 172, and H is the stack thickness of the stator core 11.

[0194] For example, λ can be 0.4, 0.6, 0.8, 1, 1.4 or 1.6.

[0195] Preferably, the fixed-frequency variable-speed compressor 100 satisfies h / H = λ, 0.8 ≤ λ ≤ 1.2, and for example, λ can be 0.8, 0.9, 1.1 or 1.2.

[0196] In the embodiment, by limiting the ratio of the length of the oil core 172 and the stack thickness of the stator core 11, the oiling of the lubricating oil can be improved at low rotation speed.

[0197] As shown in Figure 14 , the oiling amount is positively correlated with the ratio λ, by setting 0.8≤λ≤1.2, the oiling of the lubricating oil can be improved in the appropriate λ range.

[0198] In some embodiments, as shown in Figure 1 , the distance L from the bottom of the oil core 172 to the bottom end face of the stator winding 12 satisfies: L≥6mm, and the distance L can be 6mm, 10mm or more.

[0199] In the embodiment, by limiting the distance L from the bottom of the oil core 172 to the bottom end face of the stator winding 12, the oil suction port can be sufficiently lowered below the oil level, and the lubrication effect can be improved.

[0200] In some embodiments, as shown in Figure 1 , the fixed-speed variable-speed compressor 100 further comprises a limiting member 18, the limiting member 18 is connected with the oil core 172 and connected with the stator and / or the shell 15 to limit the circumferential freedom of the oil core 172, so that the oil pipe 171 and the oil core 172 rotate relative to each other.

[0201] The oil pipe 171 is connected to the rotating part of the motor to make the oil pipe 171 move synchronously with the rotating part, and the oil core 172 is connected with the stator or the shell 15 to keep the state unchanged, and under the condition that the motor is powered on, the oil pipe 171 and the oil core 172 rotate relative to each other.

[0202] The limiting member 18 can be connected with the stator or the shell 15, and the limiting member 18 can be connected with the stator, or the limiting member 18 can be connected with the shell 15, or the limiting member 18 can be connected with both the stator and the shell 15 to limit the circumferential freedom of the oil core 172, so that the oil pipe 171 and the oil core 172 rotate relative to each other, thereby drawing the lubricating oil from the lubricating oil pool 1521 to the friction part.

[0203] In the embodiment, as shown in Figure 4 and Figure 18 , the bottom end of the oil core 172 is provided with a first limiting part 1722, and the limiting member 18 is provided with a second limiting part, and the first limiting part 1722 and the second limiting part are limited and clamped to limit the circumferential freedom of the oil core 172 during the rotation of the oil pipe 171.

[0204] The first limiting part 1722 is a clamping groove, and the second limiting part is a clamping piece clamped with the clamping groove; or the first limiting part 1722 is a through hole, and the limiting member 18 is arranged in the through hole.

[0205] In some embodiments, as shown in Figure 1 The motor includes a stator core 11, which includes a plurality of stator sheets 111, a first connecting portion 1131 and a second connecting portion 1141, the first connecting portion 1131 and the second connecting portion 1141 are arranged on the stator yoke portion 1111 of at least one stator sheet 111, and the first connecting portion 1131 and the second connecting portion 1141 are distributed radially symmetrically; both ends of the limiting piece 18 are connected with the first connecting portion 1131 and the second connecting portion 1141 respectively.

[0206] Among them, the first connecting portion 1131 and the second connecting portion 1141 can be integrated with one or more stator sheets 111 in the stator core 11, or can be connected with the stator sheet 111 through other assembly parts.

[0207] The suspension spring of the variable frequency compressor in the related art is fixed on the insulating framework of the motor, and both ends of the limiting piece 18 are connected with the stator in the present application, so that the insulating framework structure of the motor can be omitted, the complexity of the structure is reduced, the production cost is reduced, and the effective volume in the shell 15 is increased.

[0208] For example, the first connecting portion 1131 and the second connecting portion 1141 can be mounting holes 118, clamping grooves or clamping portions and the like.

[0209] According to the fixed frequency variable speed compressor 100 provided by the present application, by arranging the first connecting portion 1131 and the second connecting portion 1141 to be radially symmetrically distributed along the stator sheet 111, the limiting piece 18 is also a symmetric structure, the center of the limiting piece 18 is connected with the oil core 172, and the end of the limiting piece 18 is connected with the first connecting portion 1131 and the second connecting portion 1141. In the case of motor starting, the limiting piece 18 is symmetrically stressed, the stress concentration phenomenon is reduced, and the service life of the limiting piece 18 is improved.

[0210] In some embodiments, as shown in Figure 1 The plurality of stator sheets 111 are stacked in the axial direction, and the first connecting portion 1131 and the second connecting portion 1141 are arranged on the stator sheet 111 located close to the bottom end in the height direction among the plurality of stator sheets 111, so as to facilitate the limiting piece 18 to be connected with the oil core 172 and the stator sheet 111 at the same time.

[0211] In some embodiments, the plurality of stator sheets 111 are stacked in the axial direction, and the first connecting portion 1131 and the second connecting portion 1141 are arranged on the stator sheet 111 located at the bottom end in the height direction among the plurality of stator sheets 111, which can reduce the assembly difficulty of the limiting piece 18 and the stator sheet 111.

[0212] Among them, the setting positions of the first connecting portion 1131 and the second connecting portion 1141 include at least the following three kinds:

[0213] One, as shown in Figure 5 , Figure 7 and Figure 9 , the first connecting part 1131 and the second connecting part 1141 are connected with the stator core 11 through the first fitting part 113 and the second fitting part 114.

[0214] In the present arrangement position, the fixed-speed variable-speed compressor 100 further comprises the first fitting part 113 and the second fitting part 114, which are respectively arranged on the at least one stator lamination 111 and connected with the at least one stator connecting rod 112, the first fitting part 113 is provided with the first connecting part 1131, and the second fitting part 114 is provided with the second connecting part 1141.

[0215] The first fitting part 113 can be connected with the stator lamination 111 through one or more stator connecting rods 112, and the second fitting part 114 can be connected with the stator lamination 111 through one or more stator connecting rods 112, and the connection mode can be threaded connection, plug-in or clamping.

[0216] In the present embodiment, by adopting the first fitting part 113 and the second fitting part 114, the plurality of stator laminations 111 with the same structure can be produced by the same film, without the need to separately arrange and open the mold for the structure of the plurality of stator laminations 111, thereby reducing the production difficulty and processing cost.

[0217] Among them, the first fitting part 113 and the second fitting part 114 have at least the following three structural forms.

[0218] First, as shown in Figure 5 and Figure 6 , the inner wall of the first fitting part 113 and the second fitting part 114 is arc-shaped, and in the central angle region of the first fitting part 113 and the second fitting part 114, a plurality of stator slots 1113 are correspondingly arranged, and the first fitting part 113 and the second fitting part 114 are respectively connected with the plurality of stator connecting rods 112.

[0219] The first fitting part 113 is connected with the plurality of stator connecting rods 112, and exemplarily, the first fitting part 113 is connected with 2 stator connecting rods 112; the second fitting part 114 is connected with the plurality of stator connecting rods 112, and exemplarily, the second fitting part 114 is connected with other 2 stator connecting rods 112.

[0220] The first assembly part 113 and the second assembly part 114 are both provided with a plurality of assembly holes, the plurality of assembly holes of the first assembly part 113 are coaxially arranged with a part of the connection holes 11112 of the stator yoke part 1111, the plurality of assembly holes of the second assembly part 114 are coaxially arranged with another part of the connection holes 11112 of the stator yoke part 1111, and the first assembly part 113 and the second assembly part 114 are connected with the stator lamination 111 through a plurality of stator connecting rods 112 respectively.

[0221] The first assembly part 113 and the second assembly part 114 are symmetrically distributed on the stator lamination 111.

[0222] The first assembly part 113 and the second assembly part 114 are connected with different stator connecting rods 112 respectively.

[0223] In the embodiment, by lengthening the circumferential length of the first assembly part 113 and the second assembly part 114, the first assembly part 113 and the second assembly part 114 can be connected with the corresponding stator lamination 111 in multiple points, and the stability of the connection is improved.

[0224] The first assembly part 113 and the second assembly part 114 are both provided with a first protruding part 115, the first protruding part 115 protrudes radially from the outer wall of the stator yoke part 1111, the first protruding part 115 of the first assembly part 113 is provided with a first connecting part 1131, and the first protruding part 115 of the second assembly part 114 is provided with a second connecting part 1141.

[0225] The first protruding part 115 of the first assembly part 113 and the first protruding part 115 of the second assembly part 114 are symmetrically distributed. By arranging the structure that the first assembly part 113 and the second assembly part 114 are both provided with the first protruding part 115, the first assembly part 113 and the second assembly part 114 can be clamped between two adjacent stator laminations 111, or can be located at the bottom end of the stator core 11 in the axial direction, and the flexibility of the setting position of the first assembly part 113 and the second assembly part 114 is increased.

[0226] The first assembly part 113 and the second assembly part 114 can be gaskets, the first assembly part 113 and the second assembly part 114 can be fixed on the stator core 11 through the stator connecting rods 112, and the limiting part 18 is fixed on the first connecting part 1131 and the second connecting part 1141 of the gasket.

[0227] The first assembly part 113 and the second assembly part 114 do not protrude radially from the inner wall of the stator yoke part 1111, so as to reduce the interference of the first assembly part 113 and the second assembly part 114 on the area of the stator slot 1113.

[0228] In the embodiment, the first assembly 113 and the second assembly 114 are distributed in radial symmetry of the stator yoke 1111, so that the mounting holes 118 are aligned in the radial direction, and the first connecting portion 1131 and the second connecting portion 1141 can be the mounting holes 118, and the axial direction of the mounting holes 118 is parallel to the axial direction of the connecting holes 11112.

[0229] The two ends of the limiting member 18 can be directly inserted into the mounting holes 118 in the height direction, which reduces the installation difficulty.

[0230] Secondly, as shown in Figure 7 and Figure 8 The first assembly 113 and the second assembly 114 are centrally symmetrically distributed on the stator sheet 111 and connected to different stator connecting rods 112, respectively.

[0231] The first assembly 113 and the second assembly 114 each have a second protruding portion 116, and the second protruding portion 116 of the first assembly 113 is centrally symmetrically distributed with the second protruding portion 116 of the second assembly 114.

[0232] The second protruding portion 116 of the first assembly 113 protrudes from the body of the first assembly 113, and the second protruding portion 116 of the second assembly 114 protrudes from the body of the second assembly 114.

[0233] The second protruding portion 116 of the first assembly 113 is provided with a first connecting portion 1131, and the second protruding portion 116 of the second assembly 114 is provided with a second connecting portion 1141.

[0234] The first assembly 113 can be connected to one of the stator connecting rods 112, and the second assembly 114 can be connected to the other stator connecting rod 112, and the first assembly 113 and the second assembly 114 can rotate around the connected stator connecting rod 112, improving the flexibility of the setting position.

[0235] In the case that the second protruding portion 116 protrudes from the outer diameter of the stator sheet 111, the first assembly 113 and the second assembly 114 can be clamped between two adjacent stator sheets 111 or located at the bottom end of the stator core 11 in the axial direction, increasing the flexibility of the setting position of the first assembly 113 and the second assembly 114.

[0236] In the case that the second protruding portion 116 does not protrude from the outer diameter of the stator sheet 111, the first assembly 113 and the second assembly 114 can be located at the bottom end of the stator core 11 in the axial direction, reducing the influence on the outer diameter of the stator core 11.

[0237] The first assembly part 113 and the second assembly part 114 can be gaskets, and the first connecting part 1131 and the second connecting part 1141 are fixed on the gaskets.

[0238] The first assembly part 113 and the second assembly part 114 are provided with an assembly hole, the assembly hole of the first assembly part 113 is coaxially arranged with one of the connecting holes 11112 of the stator yoke part 1111, and the assembly hole of the second assembly part 114 is coaxially arranged with one of the connecting holes 11112 of the stator yoke part 1111.

[0239] The first connecting part 1131 and the second connecting part 1141 are mounting holes 118, and the axial direction of the mounting hole 118 is perpendicular to the axial direction of the connecting hole 11112.

[0240] In the embodiment, the first connecting part 1131 and the second connecting part 1141 are centrally symmetrically arranged, so that the mounting holes 118 are radially aligned, and the two ends of the limiting part 18 are connected with the two mounting holes 118 along the radial direction.

[0241] Third, as shown in Figure 9 and Figure 10 The first assembly part 113 and the second assembly part 114 are both cover bodies, the cover bodies are arranged on the end portions of the two stator connecting rods 112 which are centrally symmetrically arranged, the cover bodies are provided with third protruding parts 117, the third protruding part 117 of the first assembly part 113 is provided with the first connecting part 1131, and the third protruding part 117 of the second assembly part 114 is provided with the second connecting part 1141.

[0242] In the structure, the first assembly part 113 and the second assembly part 114 can be the nuts of the stator connecting rods 112, and the first assembly part 113 and the second assembly part 114 provided with the third protruding parts 117 are arranged on the end portions of the stator connecting rods 112.

[0243] The first assembly part 113 and the second assembly part 114 are centrally symmetrically arranged on the stator lamination 111, so that the first connecting part 1131 and the second connecting part 1141 are radially arranged.

[0244] Second, as shown in Figure 11 The first connecting part 1131 and the second connecting part 1141 are directly arranged on the stator core 11.

[0245] In the embodiment, the first connecting part 1131 and the second connecting part 1141 are both mounting holes 118, and the stator yoke part 1111 is provided with the mounting hole 118.

[0246] In the embodiment, the plurality of stacked stator sheets 111 include at least two structures, one is a stator sheet 111 provided with only the connecting hole 11112, and the other is a stator sheet 111 provided with the first connecting part 1131 and the second connecting part 1141, the stator sheets 111 of the two structures are produced by different films, the first assembly part 113 and the second assembly part 114 and the like structures can be omitted, the complexity of the structure is reduced, and the assembly difficulty is reduced.

[0247] Among them, two fourth protruding parts are arranged on one of the plurality of stacked stator sheets 111, the fourth protruding parts are provided with mounting holes 118 for connecting with the limiting part 18, the stator sheet 111 with the fourth protruding parts is stacked with other stator sheets 111 without the fourth protruding parts to form the stator core 11, and the suspension spring is fixed on the two mounting holes 118 when the fixed-speed variable-speed compressor 100 is assembled.

[0248] Thirdly, the first connecting part 1131 and the second connecting part 1141 are connected with the shell 15, that is, the two ends of the limiting part 18 are connected with the shell 15.

[0249] In some embodiments, as shown in Figure 15 The fixed-speed variable-speed compressor 100 further includes a shell 15, the shell 15 is provided with a wiring board 151, the wiring board 151 has a plurality of wiring ends 1511, one end of the plurality of wiring ends 1511 is connected with the plurality of outgoing taps of the stator winding 12 respectively.

[0250] Among them, the number of the wiring ends 1511 is greater than or equal to the number of the outgoing taps of the stator winding 12, so as to meet the wiring requirement.

[0251] The embodiment of the application further provides a stator core 11 applied to the fixed-speed variable-speed compressor 100, the stator core 11 includes a plurality of stator sheets 111 stacked along the axial direction, and the stator sheet 111 includes:

[0252] A stator yoke part 1111, an outer peripheral wall of the stator yoke part 1111 includes oppositely arranged arc-shaped walls 11111;

[0253] A plurality of stator tooth parts 1112 with the same radial length, the plurality of stator tooth parts 1112 are connected with the inner peripheral wall of the stator yoke part 1111 and are arranged in a circumferential interval along the inner peripheral wall of the stator yoke part 1111, the stator slots 1113 are formed between adjacent stator tooth parts 1112, and a plurality of connection points, at which the plurality of stator tooth parts 1112 are connected with the stator yoke part 1111, are in a circular array concentric with the arc-shaped walls 11111.

[0254] According to the stator core 11 provided in the embodiment of the present application, the arc-shaped walls 11111 and the plurality of stator tooth portions 1112 with the same radial length are arranged on the outer peripheral wall of the stator yoke portion 1111, the cross-sectional area of the magnetic flux circulation is increased, the magnetic field saturation degree is reduced, and thus the motor efficiency is improved.

[0255] The embodiment of the present application further provides a rotor core 13 applied to the fixed-frequency variable-speed compressor 100, the rotor core 13 comprises a plurality of rotor laminations 131 stacked in the axial direction, and the rotor lamination 131 comprises a rotor slot 132.

[0256] The rotor slot 132 comprises a plurality of rotor slots 132 arranged in the circumferential direction of the rotor lamination 131, the rotor slot 132 comprises two arc-shaped segments 1321 arranged in the radial direction of the rotor lamination 131 and two straight line segments 1322 arranged in the circumferential direction of the rotor lamination 131, the radius of the arc-shaped segment 1321 close to the center of the rotor lamination 131 is smaller than the radius of the arc-shaped segment 1321 far from the center of the rotor lamination 131, and the distance between the two straight line segments 1322 close to the center of the rotor lamination 131 of any two adjacent rotor slots 132 is smaller than the diameter of the arc-shaped segment 1321 close to the center of the rotor lamination 131.

[0257] According to the rotor core 13 provided in the embodiment of the present application, by arranging the distance between the two straight line segments 1322 close to each other of any two adjacent rotor slots 132, the shape of the rotor slot 132 can be optimized, the area ratio of the rotor slot 132 on the rotor lamination 131 can be increased, the electromagnetic performance of the motor can be improved, and the noise reduction effect can be achieved.

[0258] The embodiment of the present application further provides a motor applied to the fixed-frequency variable-speed compressor 100, comprising a stator and a rotor.

[0259] The stator comprises a stator core 11 and a stator winding 12, the stator winding 12 is wound on the stator tooth portion 1112 of the stator core 11, the stator winding 12 comprises a first coil portion and a second coil portion, the pole pair numbers of the first coil portion and the second coil portion are different, the stator core 11 comprises a plurality of stator laminations 111, and the sizes of a plurality of stator slots 1113 of the stator lamination 111 are the same.

[0260] The rotor is arranged in the stator and comprises a plurality of rotor laminations 131, the sizes of a plurality of rotor slots 132 of the rotor lamination 131 are the same, the rotor slot 132 comprises two straight line segments 1322 arranged in the circumferential direction of the rotor lamination 131 and an arc-shaped segment 1321 arranged in the radial direction, the straight line segment 1322 and the arc-shaped segment 1321 are arranged alternately, and the distance between the two straight line segments 1322 close to the center of the rotor lamination 131 of any two adjacent rotor slots 132 is smaller than the diameter of the arc-shaped segment 1321 with a smaller radius of the two arc-shaped segments 1321.

[0261] The motor provided by the embodiment of the application can run at the first target rotating speed or the second target rotating speed under the condition that the input voltage and frequency are constant. When the refrigeration demand corresponds to a high load working condition, the refrigeration equipment 1000 can be controlled to run at the first target rotating speed to meet the refrigeration demand and quickly refrigerate. When the refrigeration demand corresponds to a low load working condition, the refrigeration equipment 1000 can be controlled to run at the second target rotating speed to realize the refrigeration effect, effectively reduce the power consumption of the fixed-frequency variable-speed compressor 100, and obviously reduce the noise. On the other hand, the electromagnetic performance of the motor can be improved by optimizing the structures of the stator lamination 111 and the rotor lamination 131, the noise can be reduced, and the efficiency of the motor can be improved.

[0262] The embodiment of the application further provides a fixed-frequency variable-speed compressor 100, which comprises a shell 15, a motor, a cylinder 16, and a lubricating assembly 17.

[0263] The shell 15 forms a mounting cavity 152, and the mounting cavity 152 is provided with a lubricating oil pool 1521;

[0264] The motor is mounted in the mounting cavity 152 and located above the lubricating oil pool 1521;

[0265] The cylinder 16 is mounted in the mounting cavity 152, and an input end 161 of the cylinder 16 is power-coupling connected with a rotating part of the motor;

[0266] The lubricating assembly 17 comprises an oil pipe 171 and an oil wick 172. The oil pipe 171 and the oil wick 172 extend into the motor from the lubricating oil pool 1521. The outer wall of the oil wick 172 is provided with an upward spiral groove 1721. The oil pipe 171 is connected with the rotating part and is sleeved on the outer wall of the oil wick 172 and rotationally assembled with the oil wick 172 to form an oil path between the inner wall of the oil pipe 171 and the spiral groove 1721. The radially outer end of the spiral groove 1721 is spaced apart from the inner wall of the oil pipe 171.

[0267] The fixed-frequency variable-speed compressor 100 provided by the embodiment of the application can improve the height of lubricating oil delivery by setting the lubricating assembly 17 in the spiral oil feeding mode, effectively lubricate the stator with a large thickness structure, and improve the application scenarios.

[0268] The embodiment of the present application further provides a fixed-frequency variable-speed compressor 100, comprising a shell 15, a motor, a cylinder 16 and a lubricating assembly 17; the shell 15 is provided with a lubricating oil pool 1521; the motor is installed in the shell 15 and is located above the lubricating oil pool 1521, and the motor comprises a stator core 11, the stator core 11 comprises a plurality of stator laminations 111, a first connecting part 1131 and a second connecting part 1141, the first connecting part 1131 and the second connecting part 1141 are arranged on a stator yoke part 1111 of at least one stator lamination 111, and the first connecting part 1131 and the second connecting part 1141 are distributed in a radial direction; the cylinder 16 is installed in the shell 15, and an input end 161 is power-coupled and connected with a rotating part of the motor; the lubricating assembly 17 comprises an oil pipe 171 and an oil core 172, the oil pipe 171 and the oil core 172 extend into the stator core 11 from the lubricating oil pool 1521, the oil pipe 171 is connected with the rotating part, the oil pipe 171 is arranged in a hollow manner on the outside of the oil core 172 and is rotatably assembled with the oil core 172 to form an oil path; a limiting piece 18 is connected with the oil core 172, and two ends thereof are connected with the first connecting part 1131 and the second connecting part 1141 respectively.

[0269] According to the fixed-frequency variable-speed compressor 100 provided by the embodiment of the present application, by connecting two ends of the limiting piece 18 with the stator, the insulating framework structure of the motor can be omitted, the complexity of the structure is reduced, the production cost is reduced, and the effective volume in the shell 15 is increased.

[0270] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and are not limited in number, for example, the first object can be one or multiple. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the front and rear associated objects are in an "or" relationship.

[0271] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0272] In the description of the application, "first feature", "second feature" can include one or more of the features.

[0273] In the description of the application, "a plurality of" means two or more.

[0274] In the description of the application, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0275] In the description of the application, "on", "above" and "over" the first feature of the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0276] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0277] Although the embodiments of the application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A fixed-speed variable- speed compressor characterized by, The compressor comprises: a shell, a lubricating oil pool being arranged in the shell; a motor, the motor being arranged above the lubricating oil pool, the motor comprising a stator, a rotor and a crankshaft; a cylinder, the cylinder being connected with the stator and being power-coupled with the crankshaft; a lubricating assembly, the lubricating assembly comprising an oil pipe and an oil core, the oil pipe and the oil core extending into the motor from the lubricating oil pool, the oil pipe being connected with the rotor or the crankshaft, the oil core and / or the oil pipe being provided with a helical groove, the oil core being sleeved on the oil pipe.

2. The compressor according to claim 1, wherein: the oil core and the oil pipe are clearance-fitted, a clearance d between an outer wall of the oil core and an inner wall of the oil pipe satisfies 0.05mm≤d≤0.25mm; and / or a helical pitch θ of the helical groove satisfies 10°≤θ≤60°.

3. The fixed-speed variable- torque compressor of claim 1, wherein, the oil core and the oil pipe are interference-fitted.

4. The fixed-speed variable- torque compressor of claim 1, wherein, the rotor of the motor is arranged in the stator, the crankshaft is fixedly connected with the rotor, and the crankshaft is provided with an oil passing hole; the oil pipe is connected with the crankshaft, one end of the oil pipe is located in the oil passing hole, and the other end of the oil pipe extends out of the oil passing hole and is immersed in the lubricating oil pool.

5. The compressor according to claim 1, wherein: h / H=λ, 0.4≤λ≤1.6 is satisfied, wherein h is a length of the oil core, and H is a stack thickness of a stator core of the stator; and / or a distance L from a bottom of the oil core to a bottom end surface of the stator satisfies L≥6mm.

6. The fixed-speed variable- speed compressor of any of claims 1-5, wherein, The compressor further comprises a limiting piece, the limiting piece being connected with the oil core and being connected with the stator and / or the shell.

7. The fixed-speed variable- torque compressor of claim 6, wherein, The compressor further comprises a first assembly piece and a second assembly piece, the first assembly piece and the second assembly piece being connected with the stator, and the limiting piece being connected with the first assembly piece and the second assembly piece.

8. The fixed-speed variable- torque compressor of claim 7, wherein, The first assembly piece and the second assembly piece are both provided with mounting holes, and the limiting piece is connected with the mounting holes. The stator comprises a stator core and a stator connecting rod, and the first assembly piece and the second assembly piece are respectively connected with the stator core and / or the stator connecting rod.

9. The fixed-speed variable- torque compressor of claim 6, wherein, The stator comprises a stator core, the stator core comprising a plurality of stator laminations, a first connecting part and a second connecting part, the first connecting part and the second connecting part being arranged on a stator yoke part of at least one stator lamination, and the first connecting part and the second connecting part being symmetrically distributed, and two ends of the limiting piece are respectively connected with the first connecting part and the second connecting part. The first connecting part and the second connecting part are both mounting holes, and the stator yoke part is provided with the mounting holes.

10. A refrigeration appliance characterized in that, The compressor comprises the compressor according to any one of claims 1-9.

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