Motor, rotary compressor, and refrigeration device

Abstract

To prevent an end of an insulating sheet from protruding toward the inner diameter side of a slot.SOLUTION: An insulating sheet (40) includes a base (45), a first folded portion (41), and a second folded portion (42). The length S1 of the side of the first end face (33a) of the first folded portion (41) located on the first downstream side (36b), the length L1 of the side of the first end face (33a) of the second folded portion (42) located on the first upstream side (36a), the length S2 of the side of the second end face (33b) of the second folded portion (42) located on the second upstream side (37a), and the length L2 of the side of the second end face (33b) of the first folded portion (41) located on the second downstream side (37b) satisfy the conditions of S1<L1, S1<L2, S2<L1, and S2<L2.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a motor, a rotary compressor, and a refrigeration device. [Background technology]

[0002] Patent document 1 discloses a hermetic electric compressor equipped with a stator having a stator core with multiple teeth, insulating sheets (slot insulating paper) inserted into slots between each of the teeth, and stator windings wound around the teeth via the insulating sheets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4470168 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when winding the windings around the teeth, gaps may occur at the corners of the teeth downstream in the winding direction, which may prevent the windings from adequately pressing down the insulating sheet. In this case, there is a risk that the ends of the insulating sheet may protrude into the inner diameter side of the slots through the gaps between the teeth and the windings.

[0005] An object of the present disclosure is to prevent the end of the insulating sheet from protruding toward the inner diameter side of the slot portion. [Means for solving the problem]

[0006] A first aspect of the present disclosure is a motor including a stator (31) having an annular back yoke (32), a plurality of teeth (33) extending radially inward from the back yoke (32), and a coil (35) wound around the teeth (33), the stator (31) being provided with an insulating sheet (40) disposed in a slot portion (34) of the stator (31) for insulating the teeth (33) and the coil (35), the insulating sheet (40) having, when viewed from the axial direction of the stator (31), a base portion (45) extending along the back yoke (32) in the slot portion (34), and a first bent portion (41) and a second bent portion (42) respectively extending along the shape of portions from both circumferential ends of the base portion (45) to the tips of the teeth (33), with the upstream side in the winding direction of the coil (35) extending along a first end face (33a) on one axial end side of the teeth (33) being defined as a first upstream side (36a) and the downstream side being defined as a first downstream side (36b), and the upstream side in the winding direction of the coil (35) extending along a second end face (33b) on the other axial end side of the teeth (33) being defined as a second upstream side (37a) and the downstream side being defined as a second downstream side (37b), and lengths S1 of sides on the first end face (33a) side of the first bent portion (41) located on the first downstream side (36b), lengths L1 of sides on the first end face (33a) side of the second bent portion (42) located on the first upstream side (36a), lengths S2 of sides on the second end face (33b) side of the second bent portion (42) located on the second upstream side (37a), and lengths L2 of sides on the second end face (33b) side of the first bent portion (41) located on the second downstream side (37b) satisfying the conditions S1 < L1, S1 < L2, S2 < L1, and S2 < L2.

[0007] In the first aspect, by setting the lengths of the sides of the first bent portion (41) and the second bent portion (42) so as to satisfy the above-described conditions, it is possible to suppress the end portions of the insulating sheet (40) from protruding to the inner diameter side of the slot portion (34).

[0008] A second aspect of the present disclosure is the motor according to the first aspect, satisfying the conditions S1 = S2 and L1 = L2.

[0009] In the second aspect, by setting the lengths of the sides of the first folded portion (41) and the second folded portion (42) to satisfy the above-mentioned conditions, the insulating sheet (40) becomes a parallelogram, making it easier to manufacture insulating sheets (40) of the same shape.

[0010] A third aspect of the present disclosure is a rotary compressor including a motor (30) of the first or second aspect, a drive shaft (11) connected to a rotor (39) of the motor (30), and a compression mechanism (55) that is rotationally driven in association with rotation of the drive shaft (11).

[0011] In a third aspect, a rotary compressor can be provided, including a motor (30), a drive shaft (11), and a compression mechanism (55).

[0012] A fourth aspect of the present disclosure is a refrigeration system including the rotary compressor (10) of the third aspect and a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows.

[0013] In a fourth aspect, a refrigeration system including a rotary compressor (10) and a refrigerant circuit (1a) can be provided. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a refrigerant circuit diagram showing the configuration of a refrigeration device according to this embodiment. [Diagram 2] FIG. 2 is a vertical sectional view showing the configuration of the scroll compressor. [Diagram 3] FIG. 3 is a cross-sectional view of the motor as viewed from the axial direction. [Figure 4] FIG. 4 is a cross-sectional view of the stator as viewed from the radial inside. [Diagram 5] FIG. 5 is a cross-sectional view showing a state in which an insulating sheet is disposed in a slot portion when the motor according to the comparative example is viewed from the axial direction. [Figure 6] FIG. 6 is a cross-sectional view showing a state in which an end portion of the insulating sheet extends toward the rotor. [Figure 7]FIG. 7 is a development view showing the configuration of the insulating sheet. [Figure 8] FIG. 8 is a cross-sectional view showing a state in which the insulating sheet is disposed in the slot portion when the motor is viewed from the axial direction. [Figure 9] FIG. 9 is a cross-sectional view showing a state in which an end portion of the insulating sheet extends toward the rotor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] As shown in Fig. 1, a rotary compressor (10) is provided in a refrigeration system (1). The refrigeration system (1) has a refrigerant circuit (1a) filled with a refrigerant. The refrigerant circuit (1a) has a rotary compressor (10), a radiator (3), a pressure reduction mechanism (4), and an evaporator (5). The pressure reduction mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0016] The refrigeration system (1) is an air conditioner. The air conditioner may be a cooling only machine, a heating only machine, or an air conditioner that switches between cooling and heating. In this case, the air conditioner has a switching mechanism (e.g., a four-way switching valve) that switches the circulation direction of the refrigerant. The refrigeration system (1) may be a water heater, a chiller unit, a cooling device that cools the air inside a storage unit, or the like. The cooling device cools the air inside a refrigerator, a freezer, a container, or the like.

[0017] As shown in Fig. 2, the rotary compressor (10) is, for example, a scroll compressor. The rotary compressor (10) includes a casing (20), a motor (30), and a compression mechanism (55). The casing (20) is formed in a vertically elongated cylindrical shape and is configured as a sealed dome type. The casing (20) accommodates the motor (30) and the compression mechanism (55).

[0018] The motor (30) has a stator (31) and a rotor (39). The stator (31) is fixed to an inner circumferential surface of the casing (20). The rotor (39) is disposed inside the stator (31). The drive shaft (11) passes through the rotor (39). The rotor (39) is fixed to the drive shaft (11). Details of the motor (30) will be described later.

[0019] An oil reservoir (21) is provided at the bottom of the casing (20). Oil is stored in the oil reservoir (21). A suction pipe (12) is connected to the top of the casing (20). A discharge pipe (13) is connected to the body of the casing (20).

[0020] A housing (50) is fixed to the casing (20). The housing (50) is disposed above the motor (30). A compression mechanism (55) is disposed above the housing (50). The inlet end of the discharge pipe (13) is located between the motor (30) and the housing (50).

[0021] A recess (53) is formed in the housing (50). The recess (53) is formed by depressing a portion of the upper surface of the housing (50). An upper bearing (51) is provided below the recess (53).

[0022] The drive shaft (11) extends in the vertical direction along the central axis of the casing (20). The drive shaft (11) has a main shaft portion (14) and an eccentric portion (15).

[0023] The eccentric portion (15) is provided at the upper end of the main shaft portion (14). A lower portion of the main shaft portion (14) is rotatably supported by a lower bearing (22). The lower bearing (22) is fixed to the inner circumferential surface of the casing (20). For example, a positive displacement pump (25) is provided in the lower bearing (22). An upper portion of the main shaft portion (14) passes through the housing (50) and is rotatably supported by an upper bearing (51) of the housing (50).

[0024] The compression mechanism (55) includes a fixed scroll (60) and a movable scroll (70). The fixed scroll (60) is fixed to an upper surface of the housing (50). The movable scroll (70) is disposed between the fixed scroll (60) and the housing (50).

[0025] The fixed scroll (60) has a fixed end plate (61), a fixed side wrap (62), and an outer circumferential wall (63). The outer circumferential wall (63) is formed in a substantially cylindrical shape. The outer circumferential wall (63) stands on the outer edge of the front surface (the lower surface in FIG. 2) of the fixed end plate (61).

[0026] The fixed-side wrap (62) is formed in a spiral shape and is provided upright inside the outer circumferential wall (63) of the fixed-side end plate (61).

[0027] The fixed side end plate (61) is located on the outer periphery side and is formed continuously with the fixed side wrap (62). The tip surface of the fixed side wrap (62) and the tip surface of the outer periphery wall (63) are formed to be substantially flush with each other. The fixed scroll (60) is fixed to the housing (50).

[0028] The movable scroll (70) has a movable end plate (71), a movable wrap (72), and a boss portion (73). The movable wrap (72) is formed in a spiral shape. The movable wrap (72) is formed on the upper surface of the movable end plate (71). The movable wrap (72) meshes with the fixed wrap (62).

[0029] The boss portion (73) is formed at the center of the lower surface of the movable end plate (71). The eccentric portion (15) of the drive shaft (11) is inserted into the boss portion (73) to couple the drive shaft (11).

[0030] The compression mechanism (55) has a fluid chamber (S) into which the refrigerant flows. The fluid chamber (S) is formed between a fixed scroll (60) and a movable scroll (70). The movable scroll (70) is disposed such that a movable side wrap (72) meshes with a fixed side wrap (62) of the fixed scroll (60).

[0031] A suction port (64) is formed in the outer peripheral wall (63) of the fixed scroll (60). The suction port (64) opens near the end of the fixed side wrap (62). The downstream end of the suction pipe (12) is connected to the suction port (64).

[0032] A discharge port (65) is formed in the center of the fixed end plate (61) of the fixed scroll (60). The discharge port (65) opens in an upper surface of the fixed end plate (61) of the fixed scroll (60). High-pressure gas refrigerant discharged from the discharge port (65) flows into the lower space (24) through a passage (not shown) formed in the housing (50).

[0033] An oil supply passage (16) is formed inside the drive shaft (11). The oil supply passage (16) extends vertically from the lower end to the upper end of the drive shaft (11). The lower end of the drive shaft (11) is connected to a pump (25). The lower end of the pump (25) is immersed in an oil reservoir (21). The pump (25) draws up oil from the oil reservoir (21) as the drive shaft (11) rotates, and transports the oil to the oil supply passage (16). The oil supply passage (16) supplies oil from the oil reservoir (21) to the sliding surfaces between the lower bearing (22) and the drive shaft (11) and between the upper bearing (51) and the drive shaft (11), and also to the sliding surface between the boss portion (73) and the drive shaft (11). The oil supply passage (16) opens into the upper end surface of the drive shaft (11) and supplies oil to the upper portion of the drive shaft (11).

[0034] <About the motor> As shown in Fig. 3, the motor (30) includes a stator (31) and a rotor (39). The stator (31) includes a back yoke (32), teeth (33), a coil (35), and an insulating sheet (40).

[0035] The back yoke (32) forms an annular portion on the outer circumferential side of the stator (31) when viewed in the axial direction of the stator (31).

[0036] The teeth (33) extend radially inward from the back yoke (32). A plurality of teeth (33) are provided at intervals in the circumferential direction. A slot portion (34) is provided between adjacent teeth (33). An insulating sheet (40) and a coil (35) are arranged in the slot portion (34). The coil (35) is wound around the teeth (33), for example, by a concentrated winding method. A predetermined gap (air gap) is provided between the tip end of the teeth (33) and the outer circumferential surface of the rotor (39).

[0037] The insulating sheet (40) is disposed in the slot portion (34). The insulating sheet (40) insulates the teeth (33) from the coil (35). The insulating sheet (40) has a base portion (45), a first bent portion (41), and a second bent portion (42).

[0038] The base portion (45) extends along the back yoke (32) in the slot portion (34) when viewed in the axial direction of the stator (31). The first bent portion (41) extends along the shape of the portion from one circumferential end (left end in FIG. 3) of the base portion (45) to the tips of the teeth (33). The second bent portion (42) extends along the shape of the portion from the other circumferential end (right end in FIG. 3) of the base portion (45) to the tips of the teeth (33).

[0039] 4, the upstream side in the winding direction of the coil (35) extending along a first end face (33a) at one axial end side (upper end side in FIG. 4) of the tooth (33) is referred to as a first upstream side (36a), and the downstream side is referred to as a first downstream side (36b). Also, the upstream side in the winding direction of the coil (35) extending along a second end face (33b) at the other axial end side (lower end side in FIG. 4) of the tooth (33) is referred to as a second upstream side (37a), and the downstream side is referred to as a second downstream side (37b).

[0040] An insulator (38) is provided on each of the first end surface (33a) and the second end surface of the tooth (33). The insulator (38) has insulating properties. The insulator (38) insulates the tooth (33) from the coil (35).

[0041] <About the insulation sheet> Incidentally, in the manufacturing process of the motor (30), the motor (30) is immersed in a tank containing varnish, which is an insulating material, and a heating and drying process is performed in which the varnish is impregnated into the coil (35) and then the varnish is dried. If stress relaxation occurs in the folded portion of the insulating sheet (40) in the heating and drying process, there is a risk that the end of the insulating sheet (40) will deform so as to extend toward the inner diameter side of the slot portion (34).

[0042] Furthermore, heat generated by the motor (30) during operation of the rotary compressor (10) may also cause stress relaxation at the bent portions of the insulating sheet (40).

[0043] Here, when the insulating sheet (40) is pressed against the teeth (33) by the coil (35) wound around the teeth (33), even if the end of the insulating sheet (40) extends, it will not protrude radially inward beyond the tip of the tooth (33).

[0044] However, when the coil (35) is wound around the teeth (33), gaps are generated at the corners of the teeth (33) on the first downstream side (36b) and the second downstream side (37b) in the winding direction, and the insulating sheet (40) may not be sufficiently pressed down by the coil (35). In this case, there is a risk that the end of the insulating sheet (40) may protrude into the inner diameter side of the slot portion (34) from the gap between the teeth (33) and the coil (35).

[0045] Specifically, a comparative example will be described in which the first folded portion (41) and the second folded portion (42) of the insulating sheet (40) have the same length as shown in Fig. 5. In the example shown in Fig. 5, the side to the left of the teeth (33) is the first upstream side (36a) in the winding direction of the coil (35), and the side to the right of the teeth (33) is the first downstream side (36b) in the winding direction of the coil (35).

[0046] Here, the second bent portion (42) located on the first upstream side (36a) is pressed toward the teeth (33) by the coil (35) wound around the teeth (33). The same is true for the second upstream side (37a).

[0047] On the other hand, on the first downstream side (36b), a gap is generated between the teeth (33) and the coil (35) at the tip portion of the teeth (33). Therefore, the first bent portion (41) located on the first downstream side (36b) is not sufficiently pressed against the teeth (33) by the coil (35) wound around the teeth (33). The same is true for the second downstream side (37b).

[0048] Here, as shown in FIG. 6, when stress relaxation occurs in the folded portion of the insulating sheet (40), the second folded portion (42) located on the first upstream side (36a) does not interfere with the rotor (39) even if the end of the second folded portion (42) extends.

[0049] On the other hand, the first bent portion (41) located on the first downstream side (36b) may deform and extend to trace the shortest distance through the gap between the teeth (33) and the coil (35), which may cause interference with the rotor (39).

[0050] Therefore, in the present embodiment, it is possible to prevent the end portion of the insulating sheet (40) from protruding toward the inner diameter side of the slot portion (34).

[0051] Specifically, as shown in Fig. 7, the insulating sheet (40) has a base portion (45), a first folded portion (41), and a second folded portion (42). In Fig. 7, the folded portions of the insulating sheet (40) are indicated by dashed lines.

[0052] In the example shown in FIG. 7, in the insulating sheet (40), the side on the first end face (33a) side of the teeth (33) is defined as the upper side, and the side on the second end face (33b) side of the teeth (33) is defined as the lower side. Also, the first upstream side (36a), the first downstream side (36b), the second upstream side (37a), and the second downstream side (37b) in the winding direction of the coil (35) are the same as those in the example shown in FIG. 4.

[0053] Here, let the length of the side on the first end face (33a) side of the first bending portion (41) located on the first downstream side (36b) be S1. Let the length of the side on the first end face (33a) side of the second bending portion (42) located on the first upstream side (36a) be L1. Let the length of the side on the second end face (33b) side of the second bending portion (42) located on the second upstream side (37a) be S2. Let the length of the side on the second end face (33b) side of the first bending portion (41) located on the second downstream side (37b) be L2.

[0054] Then, set the lengths of the sides of the first bending portion (41) and the second bending portion (42) of the insulating sheet (40) so as to satisfy the conditions S1 < L1, S1 < L2, S2 < L1, and S2 < L2.

[0055] Also, it is preferable to set the lengths of the sides of the first bending portion (41) and the second bending portion (42) of the insulating sheet (40) so as to satisfy the conditions S1 = S2 and L1 = L2. In this case, the angles A1 at the upper left corner, B1 at the upper right corner, A2 at the lower right corner, and B2 at the lower left corner in FIG. 7 of the insulating sheet (40) satisfy the condition B1 = B2 < A1 = A2.

[0056] In this way, since the insulating sheet (40) becomes a parallelogram, it becomes easier to manufacture the insulating sheet (40) of the same shape.

[0057] In this manner, by making the lengths of the sides of the first bending portion (41) and the second bending portion (42) located on the downstream side in the winding direction of the coil (35) shorter than the lengths of the sides located on the upstream side, it is possible to suppress the end portion of the insulating sheet (40) that is not sufficiently pressed against the teeth (33) side from protruding to the inner diameter side of the slot portion (34).

[0058] Specifically, as shown in FIG. 8, the second bent portion (42) located on the first upstream side (36a) is pressed against the teeth (33) side by the coil (35) wound around the teeth (33). The same applies to the second upstream side (37a).

[0059] On the other hand, on the first downstream side (36b), a gap is generated between the teeth (33) and the coil (35) at the tip of the teeth (33). Therefore, the first bent portion (41) located on the first downstream side (36b) is not sufficiently pressed against the teeth (33) side by the coil (35) wound around the teeth (33). The same applies to the second downstream side (37b).

[0060] Here, as shown in FIG. 9, when stress relaxation occurs at the bent portion of the insulating sheet (40), the second bent portion (42) located on the first upstream side (36a) will not interfere with the rotor (39) even if the end of the second bent portion (42) extends.

[0061] On the other hand, the first bent portion (41) located on the first downstream side (36b) is set so that the side length is shortened. Therefore, even if the gap between the teeth (33) and the coil (35) is deformed and extended so as to draw the shortest distance, it will not interfere with the rotor (39).

[0062] - Effects of the Embodiment - In this embodiment, by setting the side lengths of the first bent portion (41) and the second bent portion (42) to satisfy the conditions S1 < L1, S1 < L2, S2 < L1, and S2 < L2, it is possible to suppress the end of the insulating sheet (40) from protruding to the inner diameter side of the slot portion (34).

[0063] In this embodiment, the lengths of the sides of the first folded portion (41) and the second folded portion (42) are set to satisfy the conditions S1 = S2 and L1 = L2, so that the insulating sheet (40) becomes a parallelogram, making it easier to manufacture insulating sheets (40) of the same shape.

[0064] In this embodiment, a rotary compressor including a motor (30), a drive shaft (11), and a compression mechanism (55) can be provided.

[0065] In this embodiment, a refrigeration system including a rotary compressor (10) and a refrigerant circuit (1a) can be provided.

[0066] Other Embodiments Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. In addition, the elements of the above embodiments, modifications, and other embodiments may be appropriately combined or substituted. In addition, the descriptions "first," "second," "third," etc. in the specification and claims are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0067] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for motors, rotary compressors, and refrigeration devices. [Explanation of symbols]

[0068] 1 Refrigeration equipment 1a Refrigerant circuit 10 Rotary Compressor 11 Drive shaft 30 Motor 31 Stator 32 Back Yoke 33 Teeth 33a 1st end surface 33b 2nd end face 34 Slot section 35 Coil 36a 1st upstream side 36b 1st downstream side 37a 2nd upstream side 37b 2nd downstream side 39 Rotor 40 Insulation sheet 41 First bending part 42 Second bending part 45 Base 55 Compression Mechanism

Claims

1. A motor including a stator (31) having an annular back yoke (32), a plurality of teeth (33) extending radially inward from the back yoke (32), and a coil (35) wound around the teeth (33), an insulating sheet (40) disposed in a slot portion (34) of the stator (31) and insulating the teeth (33) from the coil (35); The insulating sheet (40) has a base portion (45) extending along the back yoke (32) in the slot portion (34) when viewed in the axial direction of the stator (31), and a first bent portion (41) and a second bent portion (42) each extending along the shape of a portion from each end of the base portion (45) in the circumferential direction to a tip of the tooth (33), an upstream side in a winding direction of the coil (35) extending along a first end face (33a) on one end side in the axial direction of the tooth (33) is defined as a first upstream side (36a), and a downstream side in the winding direction of the coil (35) is defined as a first downstream side (36b), the upstream side in the winding direction of the coil (35) extending along a second end face (33b) on the other end side of the tooth (33) in the axial direction is defined as a second upstream side (37a), and the downstream side is defined as a second downstream side (37b), a length S1 of a side of the first bent portion (41) located on the first downstream side (36b) on the first end face (33a) side, a length L1 of a side of the second bent portion (42) located on the first upstream side (36a) on the first end face (33a) side, a length S2 of a side of the second bent portion (42) located on the second upstream side (37a) on the second end face (33b) side, and a length L2 of a side of the first bent portion (41) located on the second downstream side (37b) on the second end face (33b) side, S1<L1, S1<L2, S2<L1, and S2<L2 Satisfy the condition Motor.

2. 2. The motor of claim 1, S1=S2, and L1=L2 Satisfy the condition Motor.

3. A motor (30) according to claim 1 or 2; a drive shaft (11) connected to a rotor (39) of the motor (30); a compression mechanism (55) that is rotationally driven in association with rotation of the drive shaft (11). Rotary compressor.

4. A rotary compressor (10) according to claim 3; a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows. Refrigeration equipment.

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