JP2010223061A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor capable of preventing deterioration of oil return characteristics. <P>SOLUTION: Grooved core cuts 24a, 24b extending in a vertical direction are formed on the outer peripheral surface of a stator 23 of a motor 21. Two bolts 43a, 43b for fixing a muffler member 40 of a compression mechanism 30 to a front head 50 are arranged in the circumferentially same position as the core cuts 24a, 24b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary compressor including a motor and a compression mechanism disposed below the motor.

  As a so-called high-pressure dome type rotary compressor, a compressor having a motor housed in a casing and a compression mechanism disposed below the motor is known (for example, see Patent Document 1). The compression mechanism compresses and discharges the refrigerant by the driving force of the motor, so that a muffler space is formed between the head member disposed on the end surface of the cylinder in which the compression chamber is formed and the head member. The muffler member is disposed on the surface. The muffler member and the head member are fixed by a plurality of fastening members such as bolts. An oil reservoir for storing lubricating oil is formed in the lower part of the casing, and the lubricating oil discharged together with the refrigerant from the compression mechanism is separated from the refrigerant and then guided downward to be returned to the oil reservoir again. .

  In the rotary compressor as described above, a groove-shaped core cut extending in the vertical direction is formed on the outer peripheral surface of the stator of the motor. The compression mechanism is formed with an oil return passage penetrating in the vertical direction. The lubricating oil blown up to the space above the motor is a gap formed between the portion where the core cut is formed on the outer peripheral surface of the stator and the inner surface of the casing, and the oil return formed in the compression mechanism. The oil is guided to the lower oil sump through the passage.

JP 2008-180141 A

  However, in the compression mechanism as described above, the compressed refrigerant may leak from a portion that is not fixed by the fastening member between the muffler member and the head member, that is, a portion between adjacent fastening members. In such a case, the lubricating oil dripping from the core cut of the stator is blown up by the leaked refrigerant. As a result, the flow of the lubricating oil returning to the oil reservoir is hindered, and the oil return characteristic is deteriorated.

  Then, this invention is made | formed in order to solve the above subjects, and it aims at providing the rotary compressor which can prevent the fall of an oil return characteristic.

  A rotary compressor according to a first aspect of the present invention is a rotary compressor including a motor and a compression mechanism that is disposed below the motor and that compresses and discharges the refrigerant by the driving force of the motor. Has a stator having a core cut formed by a vertically extending notch on an outer peripheral surface, and the compression mechanism includes a head member disposed on an end surface of a cylinder in which a compression chamber is formed, and the head member And a plurality of fastening members that fix the muffler member to the head member, and at least one of the fastening members has a circumferential direction. Is arranged at the same position as the core cut.

  “At least one of the fastening members is disposed at the same position as the core cut in the circumferential direction” means that “the fastening member is located from the center position of the head member in each of the top views of the motor and the compression mechanism. "The core cut is at a position corresponding to a straight line extending so as to pass through at least one portion of".

  In the above-described rotary compressor, the oil dripping from the core cut can be prevented from being blown up by the refrigerant leaking from the portion not fixed by the fastening member between the muffler member and the head member. Accordingly, it is possible to prevent the oil return characteristics from being deteriorated.

  A rotary compressor according to a second invention is the rotary compressor according to the first invention, wherein all of the fastening members are arranged at the same position as the core cut in the circumferential direction.

  In this rotary compressor, it is possible to more reliably prevent the oil dripping from the core cut from being blown up.

  A rotary compressor according to a third aspect of the invention is the rotary compressor according to the first or second aspect of the invention, further comprising a cylindrical casing that houses the motor and the compression mechanism. At least one of them has a circular shape in plan view and is fitted in the cylindrical casing.

  In the case of a configuration in which a circular cylinder and / or head member is fitted into the cylindrical casing, no oil return passage is formed between the outer peripheral surface of the cylinder and / or head member and the inner peripheral surface of the cylindrical casing. In addition, the reduction in oil return characteristics is remarkable. Therefore, in the above-described rotary compressor, it is particularly effective to apply the present invention that can suppress a decrease in oil return characteristics.

  A rotary compressor according to a fourth invention is the rotary compressor according to any one of the first to third inventions, wherein at least one of the cylinder and the head member is one or a plurality of oils penetrating vertically. A return passage is provided, and at least one of the oil return passages is disposed at the same position as the core cut in the circumferential direction.

  Note that “at least one of the oil return passages is disposed at the same position as the core cut in the circumferential direction” means that “from the center position of the head member in each top view of the motor and the compression mechanism” This means that there is a core cut at a corresponding position on a straight line extending through at least one portion of the return passage.

  In this rotary compressor, the oil dripping from the core cut can be reliably guided to the oil return passage. Therefore, it is possible to reliably prevent the oil return characteristics from being deteriorated.

  A rotary compressor according to a fifth invention is the rotary compressor according to any one of the first to fourth inventions, wherein the muffler member has one or a plurality of discharge ports for discharging the refrigerant supplied from the compression chamber. And at least one of the discharge ports is disposed at a position different from the core cut in the circumferential direction.

  Note that “at least one of the discharge ports is disposed at a position different from the core cut in the circumferential direction” means that “from the center position of the head member in each top view of the motor and the compression mechanism, This means that there is no core cut at a position corresponding to a straight line extending so as to pass through at least one portion of the above.

  In this rotary compressor, oil dripping from the core cut can be prevented from being blown up by the refrigerant discharged from the discharge port. Therefore, it is possible to more reliably prevent the oil return characteristics from being deteriorated.

  A rotary compressor according to a sixth aspect of the present invention is the rotary compressor according to any one of the first to fifth aspects, wherein the muffler member is formed over the entire circumference of the outer peripheral edge and on the upper surface of the head member. The muffler member is fixed to the head member in a state where the seal portion faces the upper surface of the head member.

  The configuration for sealing between the seal portion and the upper surface of the head member has a relatively low sealing performance and the refrigerant is likely to leak out. Therefore, it is particularly effective to apply the present invention to the rotary compressor described above.

  A rotary compressor according to a seventh aspect of the present invention is the rotary compressor according to any one of the first to fifth aspects, wherein the muffler member is formed over the entire circumference of the outer peripheral edge and on the side surface of the head member. A seal portion that can be arranged to face each other is provided, and the muffler member is fixed to the head member in a state where the seal portion faces a side surface of the head member.

  A rotary compressor according to an eighth invention is the rotary compressor according to any one of the first to seventh inventions, wherein a CO2 refrigerant is used as the refrigerant.

  In the case of using a CO2 refrigerant, it is necessary to use oil having a relatively high viscosity, so that the oil return characteristics are remarkably lowered. Therefore, in the above-described rotary compressor, it is particularly effective to apply the present invention that can suppress a decrease in oil return characteristics.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the oil dripping from the core cut can be prevented from being blown up by the refrigerant leaking from a portion not fixed by the fastening member between the muffler member and the head member. Accordingly, it is possible to prevent the oil return characteristics from being deteriorated.

  Moreover, in 2nd invention, it can prevent more reliably that the oil which drips from a core cut is blown up.

  In the third aspect of the invention, it is particularly effective to apply the present invention that can prevent a reduction in oil return characteristics.

  In addition, in the fourth invention, oil dripping from the core cut can be reliably guided to the oil return passage. Therefore, it is possible to reliably prevent the oil return characteristics from being deteriorated.

  Furthermore, in the fifth aspect, oil dripping from the core cut can be prevented from being blown up by the refrigerant discharged from the discharge port. Therefore, it is possible to more reliably prevent the oil return characteristics from being deteriorated.

  In the sixth invention, it is particularly effective to apply the present invention.

  Furthermore, in the eighth aspect of the invention, it is particularly effective to apply the present invention that can suppress a decrease in oil return characteristics.

It is sectional drawing of the rotary compressor concerning embodiment of this invention. FIG. 2 is a plan view of each part of the rotary compressor shown in FIG. 1, (a) is a plan view of the motor, and (b) is a plan view of the compression mechanism. FIG. 2 is an enlarged view of a muffler member and a front head shown in FIG. 1. Sectional drawing of the muffler member and front head of the rotary compressor concerning the 1st modification of embodiment is shown. The top view of each part of the rotary compressor concerning the 2nd modification of embodiment is shown, (a) is a top view of a motor, (b) is a top view of a compression mechanism. The top view of each part of the rotary compressor concerning the 3rd modification of embodiment is shown, (a) is a top view of a motor, (b) is a top view of a compression mechanism. The top view of each part of the rotary compressor concerning the 4th modification of an embodiment is shown, (a) is a top view of a motor and (b) is a top view of a compression mechanism.

  Hereinafter, a rotary compressor according to an embodiment of the present invention will be described based on the drawings.

  FIG. 1 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention. More specifically, FIG. 1 is a cross-sectional view taken along the line II of FIG. 2A is a plan view of the motor of the rotary compressor shown in FIG. 1, and FIG. 2B is a plan view of the compression mechanism. FIG. 3 is an enlarged view of the muffler member and the front head shown in FIG. Hereinafter, with reference to FIGS. 1-3, the rotary compressor 1 concerning one Embodiment of this invention is demonstrated in detail.

  As shown in FIG. 1, the rotary compressor 1 of the present embodiment is a one-cylinder rotary compressor, and includes a sealed casing 10, a drive mechanism 20 and a compression mechanism 30 disposed in the sealed casing 10. ing. The rotary compressor 1 is a so-called high pressure dome type compressor, and a compression mechanism 30 is disposed below the drive mechanism 20 in the hermetic casing 10. In addition, the lubricating oil 2 supplied to each sliding portion of the compression mechanism 30 is stored in the lower portion of the hermetic casing 10.

  As shown in FIG. 1, the hermetic casing 10 includes a cylindrical casing main body 11 extending in the vertical direction, and lid portions 12 attached to upper and lower opening ends of the casing main body 11. The lid 12 is welded to the casing body 11 and closes the opening of the casing body 11 in an airtight manner.

  The drive mechanism 20 is provided to drive the compression mechanism 30 and includes a motor 21 serving as a drive source and a shaft 25 attached to the motor 21. The motor 21 includes a rotor 22 and a stator 23 that is disposed outside the rotor 22 in the radial direction via an air gap.

  The rotor 22 is made of laminated electromagnetic steel plates and has a cylindrical shape. A magnet is embedded in the rotor 22. At the center of the rotor 22, a hole 22a to which the shaft 25 is attached is formed. The shaft 25 attached to the hole 22 a rotates with the rotation of the rotor 22.

  The stator 23 is composed of a plurality of laminated steel plates, and includes an annular portion 23a and teeth 23b protruding radially inward from the inner peripheral surface of the annular portion 23a, as shown in FIG. In the present embodiment, the stator 23 has 24 slots in which 24 teeth 23b are provided at equal intervals in the circumferential direction. A coil wire is wound around the plurality of teeth 23b (not shown). That is, the motor 21 of the present embodiment is a so-called distributed winding motor. The motor 21 rotates the rotor 22 together with the shaft 25 by electromagnetic force generated in the stator 23 by passing an electric current through the coil.

  On the outer peripheral surface of the annular portion 23a, two groove-shaped core cuts 24a and 24b are formed by notches extending in the vertical direction. Here, as shown in FIG. 1, the stator 23 is fitted into the casing body 11 in a state where the outer circumferential surface of the annular portion 23 a and the inner circumferential surface of the cylindrical casing body 11 are in contact with each other. At this time, the gap formed between the inner peripheral surface of the casing body 11 and the portion where the core cuts 24 a and 24 b are formed on the outer peripheral surface of the annular portion 23 a is lubricated by blowing up to a space above the motor 21. This is a passage for returning the oil 2 downward. As shown in FIG. 2A, the two core cuts 24 a and 24 b are disposed at positions symmetrical to the shaft 25 in the plan view of the motor 21.

  The shaft 25 has a function of transmitting the driving force of the motor 21 to the compression mechanism 30. The shaft 25 is provided with an eccentric portion 25 a so as to be positioned in a compression chamber B of a cylinder 60 described later in the compression mechanism 30. A roller 70 is attached to the eccentric portion 25a. Thereby, as the shaft 25 rotates together with the rotor 22, the roller 70 attached to the eccentric portion 25 a rotates in the compression chamber B.

  The compression mechanism 30 compresses the refrigerant sucked from the accumulator (not shown) by the driving force of the motor 21. The refrigerant compressed by the compression mechanism 30 passes through the air gap between the rotor 22 and the stator 23 of the drive mechanism 20 and cools the drive mechanism 20, and then the outside of the closed casing 10 is removed from the upper part of the closed casing 10. It discharges from the discharge pipe 13 extended to. In the present embodiment, CO2 refrigerant is used as the refrigerant. The compression mechanism 30 includes a muffler member 40, a front head 50, a cylinder 60 and a roller 70, and a rear head 80 from top to bottom along the rotational axis direction of the shaft 25 of the drive mechanism 20. Yes.

  The muffler member 40 is attached to the upper surface of a main body 51 to be described later of the front head 50, and forms a muffler space A together with the upper surface of the front head 50 so as to reduce noise accompanying the discharge of the refrigerant. As shown in FIGS. 2B and 3, the muffler member 40 faces a protrusion 41 that forms a muffler space A together with the upper surface of the front head 50, and an upper surface of a main body 51 that will be described later of the front head 50. And a seal portion 42 that can be arranged in this manner. The seal portion 42 extends from the lower end of the protrusion 41 and is formed over the entire periphery of the lower end of the protrusion 41.

  An opening 41 a into which the shaft 25 and the boss 52 of the front head 50 are inserted is formed in the central portion of the protruding portion 41. Further, the projecting portion 41 is formed with throttle portions 41b and 41c projecting toward the inside of the muffler space A. A seal portion 42 extending from a portion of the protruding portion 41 where the throttle portions 41b and 41c are formed serves as bolt receiving surfaces 42c and 42d on which bolts 43a and 43b for fixing the muffler member 40 and the front head 50 are disposed. . As shown in FIG. 3, the bolt receiving surfaces 42c and 42d are formed with bolt holes 42b into which the bolts 43a and 43b are inserted.

  Bolts 43a and 43b respectively arranged on the bolt receiving surfaces 42c and 42d are arranged at the same positions as the core cuts 24a and 24b in the circumferential direction. Specifically, as shown in FIGS. 2A and 2B, on a straight line L21 extending from the center O2 of the front head 50 (center of the shaft 25) so as to pass through the centers of the bolts 43a and 43b. There are core cuts 24a and 24b at corresponding positions. More specifically, the straight line L11 and the straight line L21 passing through the center O1 of the motor 21 (center of the shaft 25) and the centers of the two core cuts 24a and 24b in the plan view of the motor 21 are at the same position in the vertical direction. . That is, the center positions of the bolts 43a and 43b coincide with the center positions of the core cuts 24a and 24b in the circumferential direction. In addition, all the parts of the bolts 43a and 43b shown by broken lines in FIG. 2A are a straight line L12 connecting the center O1 of the motor 21 and one end d1 of the core cuts 24a and 24b, and the center O1 and the core. It arrange | positions in the position corresponding to the inner side between the straight line L13 which connects the other edge part d2 of cut 24a, 24b.

  Further, the discharge portion 41 is formed with two discharge ports 41d and 41e for discharging the refrigerant supplied from the compression chamber B to the muffler space A from the muffler space A. As shown in FIGS. 2A and 2B, core cuts 24a and 24b are provided at positions corresponding to a straight line L22 extending from the center O2 of the front head 50 so as to pass through the centers of the discharge ports 41d and 41e. Absent. In addition, all portions of the discharge ports 41d and 41e indicated by broken lines in FIG. 2A are not located at positions corresponding to the inside between the two straight lines L12 and L13. More specifically, the straight line L22 is orthogonal to the straight line L21 located at the same position in the vertical direction as the straight line L11. That is, the two discharge ports 41d and 41e are disposed at positions that are 90 ° different from the two core cuts 24a and 24b in the circumferential direction.

  The front head 50 is disposed on the upper end surface of the cylinder 60, and includes a disc-shaped main body portion 51 that closes an opening above the compression chamber B in the cylinder 60, and an annular boss portion 52 that protrudes upward from the main body portion 51. And an extending portion 53 extending from the outer peripheral edge of the main body portion 51. A bearing hole 51 a into which the shaft 25 is inserted is formed at the center of the main body 51. The boss portion 52 is formed so as to surround the bearing hole 51a. Further, the front head 50 has a circular shape in plan view, and as shown in FIG. 1, the outer peripheral surface of the extending portion 53 is in contact with the inner peripheral surface of the cylindrical casing body 11 over the entire circumference. In the state, it is fitted in the casing body 11.

  The main body 51 has a concave valve housing chamber (not shown) that opens upward, and a discharge port (not shown) through which refrigerant compressed by the rotational drive of the roller 70 in the compression chamber B of the cylinder 60 is discharged. And are provided. The refrigerant discharged from the discharge port is discharged from the discharge ports 41d and 41e formed in the muffler member 40 through the muffler space A described above. The valve storage chamber is provided with a discharge valve (not shown) that opens and closes the outlet of the discharge port, and a pressing member (not shown) that restricts the opening of the discharge valve.

  In order to fit the bolts 43a and 43b into the outer edge portions of the main body 51 at positions corresponding to the bolt holes 42b formed in the two bolt receiving surfaces 42c and 42d formed in the muffler member 40, respectively. Two bolt holes 51d are formed. The front head 50 is provided with through bolt holes (not shown) for fitting through bolts (not shown) for assembling the members of the compression mechanism 30.

  In the extending portion 53, two oil return passages 53a and 53b penetrating in the vertical direction are formed. As shown in FIG. 2B, the centers of the two oil return passages 53 a and 53 b are located on the above-described straight line L <b> 21 and symmetrical with respect to the shaft 25. That is, the centers of the two oil return passages 53a and 53b are arranged at the same positions as the centers of the core cuts 24a and 24b in the circumferential direction.

  As shown in FIG. 1, the cylinder 60 is provided with a compression chamber B in which a roller 70 that moves eccentrically with the rotation of the shaft 25 is disposed. The compression chamber B and the muffler space A are communicated via the above-described discharge port (not shown). Therefore, the refrigerant compressed by the eccentric movement of the roller 70 attached to the eccentric portion 25a of the shaft 25 is guided from the compression chamber B to the muffler space A through the discharge port.

  The cylinder 60 is formed with two oil return passages 61 penetrating in the vertical direction. The two oil return passages 61 are formed at positions corresponding to the lower portions of the two oil return passages 53a and 53b formed in the front head 50, respectively. That is, the centers of the two oil return passages 61 are disposed at the same positions as the centers of the core cuts 24a and 24b in the circumferential direction. As shown in FIG. 1, a slight gap is formed between the outer peripheral surface of the cylinder 60 and the inner peripheral surface of the casing body 11.

  The rear head 80 is disposed on the lower end surface of the cylinder 60 and closes the opening below the compression chamber B in the cylinder 60. The rear head 80 includes a disc-shaped main body 81 having a bearing hole 81a into which the shaft 25 is inserted, and an annular boss 82 that projects downward from the main body 81 so as to surround the bearing hole 81a. ing.

  As described above, in the rotary compressor 1 of the present embodiment, the groove-shaped core cuts 24 a and 24 b extending in the vertical direction are formed on the outer peripheral surface of the stator 23 in the motor 21. And the bolts 43a and 43b which fix the muffler member 40 and the front head 50 of the compression mechanism 30 are arrange | positioned in the same position as the core cuts 24a and 24b about the circumferential direction. Since the portions fixed by the bolts 43a and 43b between the muffler member 40 and the front head 50 are in close contact with each other compared to the other portions, there is almost no leakage of the refrigerant. Therefore, in the present embodiment, there is almost no refrigerant leakage from below the core cuts 24a, 24b. That is, the lubricating oil 2 that hangs down from the core cuts 24a and 24b is caused by the refrigerant leaked from the portions that are not fixed by the bolts 43a and 43b between the muffler member 40 and the front head 50, as indicated by broken lines in FIG. It can prevent being blown up. Therefore, it is possible to prevent a decrease in oil return characteristics.

  Moreover, in the rotary compressor 1 of this embodiment, all the bolts 43a and 43b which fix the muffler member 40 and the front head 50 are arrange | positioned in the same position as the core cuts 24a and 24b about the circumferential direction. Therefore, it can prevent more reliably that the lubricating oil 2 dripping from the core cuts 24a and 24b is blown up.

  Furthermore, the rotary compressor 1 of this embodiment includes a cylindrical casing body 11 that houses the motor 21 and the compression mechanism 30. The front head 50 has a circular shape in a plan view and is fitted into the casing body 11. Usually, in the case where the circular front head 50 is fitted into the cylindrical casing body 11 as described above, an oil return passage is not formed between the outer peripheral surface of the front head 50 and the casing body 11. The deterioration of the return characteristic is remarkable. Therefore, it is particularly effective to apply the present invention capable of suppressing the deterioration of the oil return characteristics to the rotary compressor having such a configuration.

  In addition, in the rotary compressor 1 of the present embodiment, two oil return passages 53 a and 53 b are formed in the front head 50, and two oil return passages 61 are formed in the cylinder 60. The oil return passages 53a and 53b and the oil return passage 61 are disposed at the same positions as the core cuts 24a and 24b in the circumferential direction. Therefore, the lubricating oil 2 dripping from the core cuts 24a and 24b can be reliably guided to the oil return passages 53a and 53b and the oil return passage 61. Therefore, it is possible to reliably prevent the oil return characteristics from being deteriorated.

  Further, in the rotary compressor 1 of the present embodiment, the muffler member 40 is formed with two discharge ports 41d and 41e for discharging the refrigerant supplied from the compression chamber B. The two discharge ports 41d and 41e are arranged at positions different from the core cuts 24a and 24b in the circumferential direction. Therefore, it is possible to prevent the lubricating oil 2 dripping from the core cuts 24a and 24b from being blown up by the refrigerant discharged from the discharge ports 41d and 41e. Therefore, it is possible to more reliably prevent the oil return characteristics from being deteriorated.

  Further, in the rotary compressor 1 of the present embodiment, the muffler member 40 has a seal portion 42 that is formed over the entire circumference of the outer peripheral edge and can be disposed so as to face the upper surface of the front head 50. . The muffler member 40 is fixed to the front head 50 with the seal portion 42 in contact with the upper surface of the front head 50. As described above, the sealing between the seal portion 42 and the upper surface of the front head 50 has a relatively low sealing performance, and the refrigerant is likely to leak out. Therefore, it is particularly effective to apply the present invention to the rotary compressor having such a configuration.

  Furthermore, in the rotary compressor 1 of the present embodiment, CO2 refrigerant is used as the refrigerant. When a CO2 refrigerant is used, it is necessary to use a lubricating oil having a relatively high viscosity, so that the oil return characteristics are significantly reduced. Therefore, in the rotary compressor having such a configuration, it is particularly effective to apply the present invention that can suppress a decrease in oil return characteristics.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, in the above-described embodiment, the case where a configuration in which sealing is performed between the seal portion 42 of the muffler member 40 and the upper surface of the front head 50 has been described, but the present invention is not limited thereto. Here, FIG. 4 shows a cross-sectional view of the muffler member 140 and the front head 150 of the rotary compressor according to the first modification of the above-described embodiment. As shown in FIG. 4, the muffler member 140 according to this modification includes a projecting portion 141 that forms a muffler space A together with the upper surface of the front head 150, and a seal portion 142 that can be disposed to face the side surface of the front head 150. And have. The seal portion 142 extends from the lower end of the protruding portion 141 and is formed over the entire circumference of the lower end of the protruding portion 141. The muffler member 140 is fixed to the front head 150 with the seal portion 142 facing the side surface of the front head 150. Note that the seal portion 142 and the side surface of the front head 150 may be in contact with each other, or a minute gap may be formed between them. Thus, by adopting a configuration in which sealing is performed between the seal portion 142 of the muffler member 140 and the side surface of the front head 150, sealing performance can be improved as compared with the configuration of the above-described embodiment.

  In the above-described embodiment, the core cuts 24 a and 24 b formed on the outer peripheral surface of the stator 23 in the motor 21, the bolts 43 a and 43 b that fix the muffler member 40 and the front head 50, and the oil formed on the front head 50. Although the case where each of the return passages 53a and 53b and the oil return passages 61 formed in the cylinder 60 is provided two by two has been described, the number of these is not limited to two.

  Here, a plan view of the motor 221 of the rotary compressor according to the second modification of the above-described embodiment is shown in FIG. 5A, and a plan view of the compression mechanism 230 is shown in FIG. As shown in FIG. 5A, four core cuts 224a, 224b, 224c, and 224d are formed on the outer peripheral surface of the stator 223 of the motor 221 according to this modification.

  As shown in FIG. 5B, the muffler member 240 and the front head 250 are fixed by four bolts 243a, 243b, 243c, and 243d. There are core cuts 224a and 224b at positions corresponding to a straight line L41 extending from the center O4 of the front head 250 so as to pass through the centers of the bolts 243a and 243b. Further, there are core cuts 224c and 224d at positions corresponding to the straight line L42 extending from the center O4 so as to pass through the centers of the bolts 243c and 243d. More specifically, the straight line L41 is at the same position in the vertical direction as a straight line L31 passing through the center O3 of the motor 221 and the centers of the two core cuts 224a and 224b. The straight line L42 is at the same position in the vertical direction as the straight line L32 passing through the center O3 of the motor 221 and the centers of the two core cuts 224c and 224d. Moreover, all the bolts 243a and 243b have a straight line L33 connecting the center O3 of the motor 221 and one end d3 of the core cuts 224a and 224b, and the other end of the center O3 and the core cuts 224a and 224b. It arrange | positions in the position corresponding to the inner side between the straight lines L34 which connect d4. Also, all the bolts 243c and 243d have a straight line L35 connecting the center O3 of the motor 221 and one end d5 of the core cuts 224c and 224d, and the other end d6 of the center O3 and the core cuts 224c and 224d. Is arranged at a position corresponding to the inside between the straight line L36 connecting the two.

  The muffler member 240 has two discharge ports 241d and 241e. There are no core cuts 224a, 224b, 224c, 224d at positions corresponding to the straight line L43 extending from the center O4 of the front head 250 so as to pass through the centers of the discharge ports 241d, 241e. In addition, as described above, all the portions of the discharge ports 241d and 241e are located at the position corresponding to the inside between the two straight lines L33 and L34 shown in FIG. 5A and between the two straight lines L35 and L36. It is not located in any of the positions corresponding to the inside. That is, the two discharge ports 241d and 241e are disposed at positions different from the core cuts 224a, 224b, 224c, and 224d in the circumferential direction.

  The front head 250 is formed with oil return passages 253a and 253b whose centers are located on the straight line L41 and oil return passages 253c and 253d located on the straight line L42. That is, also in this modified example, as with the above-described embodiment, all of the bolts 243a, 243b, 243c, 243d and the oil return passages 253a, 253b, 253c, 253d are core cuts 224a, 224b in the circumferential direction. 224c and 224d are arranged at the same position.

  Further, in the above-described embodiment, the motor 21 includes the 24-slot stator 23 and the distributed winding method has been described. However, the method of the motor 21 is not limited thereto. Here, a plan view of the motor 321 of the rotary compressor according to the third modification of the above-described embodiment is shown in FIG. 6A, and a plan view of the compression mechanism 330 is shown in FIG. 6B. As shown in FIG. 6A, the motor 321 of this modification includes a six-slot stator 323 provided with six teeth 323b, and a coil wire is directly wound around each tooth 323b via an insulator. This is a so-called concentrated winding method. Two core cuts 324 a and 324 b are formed on the outer peripheral surface of the stator 323. As shown in FIG. 6B, the two bolts 343a and 343b for fixing the muffler member 340 and the front head 350 of the compression mechanism 330 are core cut 324a, It is arranged at the same position as 324b. Further, the two discharge ports 341d and 341e formed in the muffler member 340 are arranged at positions different from the core cuts 324a and 324b in the circumferential direction. Furthermore, the oil return passages 353a and 353b formed in the extending portion 353 of the front head 350 are disposed at the same positions as the core cuts 324a and 324b in the circumferential direction.

  A plan view of the motor 421 of the rotary compressor according to the fourth modification of the above-described embodiment is shown in FIG. 7A, and a plan view of the compression mechanism 430 is shown in FIG. 7B. As shown in FIG. 7 (a), the motor 421 of the present modified example has a concentrated winding including a six-slot stator 423 provided with six teeth 423b, similarly to the motor 321 according to the third modified example described above. It is a method. Four core cuts 424a, 424b, 424c, and 424d are formed on the outer peripheral surface of the stator 423. As shown in FIG. 7B, the muffler member 440 and the front head 450 of the compression mechanism 430 have four bolts 443a disposed at the same positions as the core cuts 424a, 424b, 424c, 424d, respectively. It is fixed with 443b, 443c, 443d. Further, the two discharge ports 441d and 441e formed in the muffler member 440 are arranged at positions different from the core cuts 424a, 424b, 424c, and 424d in the circumferential direction. Furthermore, four oil return passages 453a, 453b, 453c, and 453d are formed in the extending portion 453 of the front head 450 in the same positions as the core cuts 424a, 424b, 424c, and 424d in the direction.

  In addition, in the above-described embodiment, the center positions of the bolts 43a and 43b coincide with the center positions of the core cuts 24a and 24b in the circumferential direction, and all the parts of the bolts 43a and 43b are Arranged at a position corresponding to the inside of a straight line L12 passing through the center O1 and one end d1 of the core cuts 24a and 24b and a straight line L13 passing through the center O1 and the other end d2 of the core cuts 24a and 24b. However, the present invention is not limited to this. That is, the core cuts 24a and 24b may be located at positions corresponding to a straight line passing through the center O2 of the front head 50 and at least one part of the bolts 43a and 43b.

  Moreover, although the above-mentioned embodiment demonstrated the case where all the volt | bolts 43a and 43b are arrange | positioned in the same position as the core cuts 24a and 24b about the circumferential direction, at least one of the volt | bolts 43a and 43b is the circumferential direction. About the core cuts 24a and 24b.

  Furthermore, in the above-described embodiment, the front head 50 has a circular shape in a plan view, and the casing has the outer peripheral surface thereof in contact with the inner peripheral surface of the cylindrical casing body 11 over the entire circumference. Although the case where it was inserted in the main body 11 was demonstrated, it is not restricted to this. That is, at least one of the front head 50 and the cylinder 60 may contact the outer peripheral surface with the inner peripheral surface of the cylindrical casing body 11 over the entire periphery. Further, at least one of the front head 50 and the cylinder 60 may be fitted into the casing main body 11 in a state where only a part of the outer peripheral surface thereof is in contact with the inner peripheral surface of the casing main body 11. In this case, the clearance between the portion of the outer peripheral surface of the front head 50 and / or the cylinder 60 that is not in contact with the inner peripheral surface of the casing main body 11 and the inner peripheral surface of the casing main body 11 causes the lubricating oil 2 to move downward. It becomes a passage for returning.

  In addition, in the above-described embodiment, the two oil return passages 53a and 53b are formed in the front head 50, and the two oil return passages 61 are disposed at positions corresponding to the lower portions of the oil return passages 53a and 53b in the cylinder 60. Are described, and the center of the oil return passages 53a and 53b is disposed at the same position as the center of the core cuts 24a and 24b in the circumferential direction. However, the present invention is not limited to this. The core cuts 24a and 24b are preferably located at positions corresponding to a straight line passing through the center O2 of the front head 50 and at least a part of the oil return passages 53a and 53b, but the oil return passages 53a, 53b and 61 are The core cuts 24a and 24b may not be disposed at the same position.

  Moreover, although the above-mentioned embodiment demonstrated the case where the oil return channel | paths 53a, 53b, 61 were formed in both the front head 50 and the cylinder 60, it is not limited to this. The oil return passages 53a, 53b, and 61 are fitted into the casing body 11 so that at least the outer peripheral surface of the front head 50 and the cylinder 60 is in contact with the inner peripheral surface of the cylindrical casing body 11 over the entire circumference. What is necessary is just to be formed in what is. That is, since the outer peripheral surface of the cylinder 60 of this embodiment is not in contact with the inner peripheral surface of the casing body 11, the oil return passage 61 formed in the cylinder 60 may be omitted.

  Further, in the above-described embodiment, the muffler member 40 is formed with two discharge ports 41d and 41e for discharging the refrigerant, and the discharge ports 41d and 41e are 90 ° with the core cuts 24a and 24b in the circumferential direction. Although the case where it arrange | positions in a different position was demonstrated, the arrangement position of the discharge outlets 41d and 41e is not limited to this. The core cuts 24a and 24b may not be provided at positions corresponding to the straight line passing through the center O2 of the front head 50 and at least a part of the discharge ports 41d and 41e. However, the discharge ports 41d and 41e are provided with the core cuts 24a and 24b in the circumferential direction. May be arranged at the same position.

  Furthermore, in the above-described embodiment, the case where the CO2 refrigerant is used as the refrigerant has been described. However, the refrigerant is not limited to CO2, and for example, chlorofluorocarbon may be used.

  If this invention is utilized, the fall of an oil return characteristic can be prevented.

1 Rotary compressor 11 Casing body (tubular casing)
30, 230 Compression mechanism 21, 221, 321, 421 Motor 23, 223, 323, 423 Stator 24a, 24b, 224a to 224d, 324a, 324b, 424a to 424d Core cut 40, 140, 240, 340, 440 Muffler member 41d , 41e, 241d, 241e, 341d, 341e, 441d, 441e Discharge port 42, 142 Sealing part 43a, 43b, 143a, 243a-243d, 343a, 343b, 443a-443d Bolt (fastening member)
50, 150, 250, 350, 450 Front head (head member)
53a, 53b, 253a to 253d, 353a, 353b, 453a to 453d Oil return passage 60 Cylinder 61 Oil return passage

Claims (8)

A rotary compressor including a motor and a compression mechanism that is disposed below the motor and compresses and discharges the refrigerant by the driving force of the motor;
The motor is
On the outer peripheral surface, it has a stator in which a core cut is formed by a notch extending in the vertical direction,
The compression mechanism is
A head member disposed on an end face of the cylinder in which the compression chamber is formed;
A muffler member arranged so that a muffler space is formed between the head member,
A plurality of fastening members for fixing the muffler member to the head member;
At least one of the fastening members is disposed at the same position as the core cut in the circumferential direction.   The rotary compressor according to claim 1, wherein all of the fastening members are arranged at the same position as the core cut in the circumferential direction. A cylindrical casing that houses the motor and the compression mechanism;
3. The rotary compressor according to claim 1, wherein at least one of the cylinder and the head member has a circular shape in a plan view and is fitted in the cylindrical casing. At least one of the cylinder and the head member has one or a plurality of oil return passages penetrating vertically.
The rotary compressor according to any one of claims 1 to 3, wherein at least one of the oil return passages is disposed at the same position as the core cut in the circumferential direction. The muffler member has one or a plurality of discharge ports for discharging the refrigerant supplied from the compression chamber,
5. The rotary compressor according to claim 1, wherein at least one of the discharge ports is disposed at a position different from the core cut in a circumferential direction. The muffler member has a seal portion that is formed over the entire periphery of the outer peripheral edge and can be disposed so as to face the upper surface of the head member;
The rotary compressor according to claim 1, wherein the muffler member is fixed to the head member in a state where the seal portion faces an upper surface of the head member. The muffler member has a seal portion that is formed over the entire outer periphery of the muffler member and can be arranged to face the side surface of the head member.
The rotary compressor according to claim 1, wherein the muffler member is fixed to the head member in a state where the seal portion faces a side surface of the head member. The rotary compressor according to any one of claims 1 to 7, wherein a CO2 refrigerant is used as the refrigerant.

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