JP2006097517A - Compressor and electric motor for compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor of good assemblability capable of always securing an oil drainage pipe at a fixed position. <P>SOLUTION: Pipe support portions 55a, 55b for supporting a part of the oil drainage pipe 8 are formed on insulators 53a, 53b integrally attached to a stator 50 of an electric motor 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor used in a refrigeration cycle or the like, and more specifically to a technique for improving the assembly and reliability of a compressor.

  In most of the compressors used in the refrigeration cycle, the inside of the hermetic shell is partitioned into a refrigerant compression unit and an electric motor chamber, and the refrigerant compression unit includes a main frame, a turning scroll, and a fixed scroll. An electric motor (motor) is provided in the electric motor chamber.

  One end of a rotary drive shaft is connected to the refrigerant compression section through a main frame, and the rotary drive shaft orbits the orbiting scroll so that the crescent-shaped space formed by the wraps is in the sealed working chamber. It moves while reducing its volume from the outside to the inside, and compresses the low-pressure refrigerant guided to the inside into a high-pressure refrigerant.

  By the way, lubricating oil is stored at the bottom of the electric motor chamber, and the lubricating oil is lifted up to the refrigerant compression chamber through an oil feeding pipe provided inside the rotary drive shaft, and the bearing portion and the refrigerant compression portion of the rotary drive shaft. After the sliding surface is lubricated, it returns to the bottom of the motor chamber again through the main frame.

  At this time, if the lubricating oil is dropped directly from the main frame into the motor chamber, the lubricating oil may be sent to the refrigeration cycle together with the refrigerant. Therefore, a part of the compressor is provided with an oil drain pipe that returns the lubricating oil to the reservoir. There is something that has been.

  As an example of the oil drain pipe, Patent Document 1 shows an oil drain pipe connected to an oil drain passage of a main frame. According to this, since the lubricating oil can be reliably returned to the bottom of the motor chamber without being affected by the flow of the refrigerant, a certain amount of lubricating oil can be always stored in the bottom, and the supply reliability of the lubricating oil is high. .

  Patent Document 2 discloses that a U-shaped frame is attached to the inner surface of the hermetic shell and the internal space is used as an oil drain guide. According to this, the lubricating oil discharged from the main frame can be returned to the lower part through the side surface of the hermetic shell.

  However, the oil drain pipe (guide) structure described above has the following problems. That is, in the invention described in Patent Document 1, since the drainage pipe is not fixed, the tip of the drainage pipe may move due to vibration of the electric motor or the like. As a result, the cause of abnormal noise and the insulation distance from the motor conductive portion may be shortened, resulting in a reduction in insulation performance.

  Further, the invention described in Patent Document 2 has poor assemblability because the oil drain guide constituting the oil drain pipe is fixed to the hermetic shell by welding after the stator of the electric motor is baked.

JP-A-8-121366 JP-A-9-287579

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compressor with good assemblability that can always fix an oil drain pipe at a fixed position.

  In order to achieve the above-described object, the present invention has several features described below. According to the first aspect of the present invention, the upper side of the inside of the sealed shell is divided into a refrigerant compression section and the lower side is divided into an electric motor chamber, and the lubricating oil stored in the bottom of the sealed shell is contained in the rotary drive shaft of the electric motor. In the compressor in which the lubricating oil is sucked up to the refrigerant compression part side through the oil guide hole and the lubricating oil is returned to the bottom part of the electric motor chamber through the oil discharge passage of the refrigerant compression part. A pipe support portion for supporting a part of the oil drain pipe for returning the lubricating oil from the passage to the bottom of the motor chamber is provided.

  According to a second aspect of the present invention, in the first aspect, the pipe support portions are provided in a pair of upper and lower sides on both end sides of the stator of the electric motor.

  According to a third aspect of the present invention, in the second aspect of the invention, any one of the pipe support portions is attached to the stator as a separate member.

  According to a fourth aspect of the present invention, in the above second or third aspect, the stator includes a stator core and insulators that are integrally attached to both ends of the stator core in the axial direction. It is provided in the said insulator.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the insulator is made of super engineering plastic.

  According to a sixth aspect of the present invention, in the fourth or fifth aspect, the outer peripheral surface of the stator core is provided with a plurality of communication grooves that connect the upper space and the lower space of the motor. At least one of the grooves is characterized by having a width in the motor radial direction larger than that of the other communication grooves as a drawing groove for drawing the oil drain pipe into the lower space.

  A seventh aspect of the invention is characterized in that, in the sixth aspect, the communication grooves are arranged so as to face the teeth of the stator core.

  The invention according to claim 8 is an inner rotor type electric motor having a stator having a plurality of teeth and a rotor arranged coaxially in the center of the stator, and the upper side inside the hermetic shell is a refrigerant compression section. In the compressor motor disposed in the motor chamber of the compressor whose lower side is partitioned into the motor chamber, the stator is integrally attached to the stator core having the teeth and both ends of the stator core. The insulator is provided with a pipe support portion for supporting an oil drain pipe for returning the lubricating oil from the refrigerant compression portion to the electric motor chamber.

  According to a ninth aspect of the present invention, in the eighth aspect, the insulator is further provided with a film holding means for holding an insulating film disposed in a slot formed between the teeth in a predetermined position. The electric motor for a compressor according to claim 8, wherein the electric motor is used.

  According to the first aspect of the present invention, the oil drainage pipe is fixed by the pipe support portions provided at both ends of the stator of the electric motor, so that abnormal noise is generated and the insulation performance from the electric motor conductive portion is reduced. In addition, the assembly operation can be easily performed even if the assembly accuracy of the oil drain pipe varies.

  According to the second and third aspects of the invention, by making one of the pipe support portions a fixed type and the other as a separate member, the assemblability can be further improved. In particular, the upper pipe support (fixed type) can correct the assembly variation of the oil drain pipe, and the position accuracy of the lower pipe support is improved. Further, the pipe support portion (separate member) on the lower side can be easily assembled because the fixing operation can be completed before the subframe is assembled. Furthermore, by using a pair of upper and lower parts, it is possible to further enhance the assemblability and reliability by these synergistic effects.

  According to the fourth aspect of the present invention, by providing the insulator made of resin, the pipe support portion can be incorporated at the same time when the insulator is manufactured, and the assembly is easy at low cost.

  According to the invention described in claim 5, by using super engineering plastic for the insulator, the resin is deteriorated by the refrigerant inside the compressor, or the refrigeration cycle is clogged (particularly capillary tube) due to the extraction of the resin component. Can be prevented.

  According to the sixth aspect of the present invention, among the communication grooves formed on the outer peripheral surface of the stator, the communication groove through which the oil drain pipe is passed has a larger width in the motor radial direction, so that the assemblability can be improved. it can. According to the seventh aspect of the present invention, the communication groove can be formed without attenuating the magnetic characteristics by forming the communication groove so as to face the teeth surface.

  According to invention of Claim 8, it can apply to various types of compressors by using the electric motor provided with the pipe holding part for various compressors. According to the ninth aspect of the present invention, by providing the film support portion, the insulation film can be prevented from being displaced when the coil is wound around the teeth, and a more reliable electric motor can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing the internal structure of a compressor according to an embodiment of the present invention. In the following description, a scroll compressor that forms a working chamber by meshing spiral scroll wraps will be described as an example.

  The scroll compressor 1 is composed of a cylindrical sealed shell 2 placed vertically, and the interior is partitioned into a refrigerant compression chamber 21 and an electric motor chamber 22 with the main frame 3 interposed therebetween.

  The refrigerant compression chamber 21 is provided with a refrigerant compression unit 4 including a fixed scroll 41 and a revolving scroll 42. In the electric motor chamber 22, a motor (electric motor) 5 for driving the refrigerant compression unit 4 and its output shaft are provided. As a rotational drive shaft 6.

  The fixed scroll 41 is integrally provided with a spiral scroll wrap 412 on the lower surface of a disk-shaped end plate 411, and a discharge port for discharging a high-pressure refrigerant generated therein is provided at the approximate center. 413 is provided.

  In the orbiting scroll 42, a spiral scroll wrap 422 is integrally formed on the upper surface of a disk-shaped end plate 421, and a boss 423 into which the crankshaft 62 of the rotary drive shaft 6 is inserted at the center of the rear surface of the end plate 421. Is formed.

  When the scroll wraps 412 and 422 of the fixed scroll 41 and the orbiting scroll 42 are engaged with each other, a sealed working chamber 43 for compressing the refrigerant is formed inside.

  In this example, the scroll compressor 10 is an internal high-pressure type, and a refrigerant for drawing low-pressure refrigerant that has finished work in a refrigeration cycle (not shown) into the sealed working chamber 43 in the upper part (compression chamber 21) of the sealed shell 2. A suction pipe 23 is provided.

  The refrigerant suction pipe 23 is connected to the side of the sealed working chamber 43, and the refrigerant suction pipe 23 of the sealed working chamber 43 is discharged into the sealed shell 2 when the scroll compressor is stopped. A backflow prevention valve 44 is provided for preventing high pressure refrigerant from flowing back through the refrigerant suction pipe 23 in the refrigeration cycle.

  A refrigerant discharge pipe 24 for sending the high-pressure refrigerant compressed by the refrigerant compressor 4 from the electric motor chamber 22 to the refrigeration cycle is connected to the side portion of the motor chamber 22 of the sealed shell 2. A certain amount of lubricating oil O is stored at the bottom of the sealed shell 2.

  Next, the main frame 3 has a disk shape whose outer periphery is fixed along the inner wall surface of the hermetic shell 2, and a main bearing 31 that supports the main shaft 61 of the rotary drive shaft 6 is formed at the center thereof. . On the upper surface side of the main frame 3, a storage recess 32 in which the end plate 421 of the orbiting scroll 42 is stored is formed.

  The storage recess 32 is formed so that its upper end surface is annularly lowered toward the lower side, and the Oldham ring 7 for preventing rotation of the orbiting scroll 42 is placed in the storage recess 32. The center of the storage recess 32 is formed to be one step lower, and the crankshaft 62 of the rotary drive shaft 6 and the boss 423 of the orbiting scroll 42 are stored in a state in which the orbiting motion is possible.

  The main frame 3 is supplied with the oil discharge passage 33 for returning the lubricating oil O, which has been fed by the rotary drive shaft 6 and finished work, into the electric motor chamber 22 again, and the high-pressure refrigerant generated in the sealed working chamber 43 is supplied to the electric motor chamber. Further, a refrigerant passage 34 for leading to 22 is provided.

  The oil discharge passage 33 has an inlet port at one end opened toward the peripheral wall surface of the housing recess 32, and a discharge port at the other end opened from the lower end surface of the main frame 3 into the electric motor chamber 22. An oil discharge pipe 8 is provided at the discharge port of the oil discharge passage 33 to guide the finished lubricating oil O to the bottom of the motor chamber 22.

  One end of the oil discharge pipe 8 is connected to the oil discharge passage 33, passes through the side of the electric motor 5 of the electric motor chamber 22, and the other end extends to the lower space (storage part) of the electric motor chamber 22, in this example. A straight tube made of synthetic resin. The oil drain pipe 8 may be made of metal.

  According to this, the lubricating oil O is always supplied to the oil supply passage 33, and when a certain amount of the lubricating oil O accumulates at the bottom of the storage recess 32, the unnecessary lubricating oil O flows into the oil discharge passage 33 through the suction port. It returns to the bottom of the motor chamber 22 through the oil drain pipe 8.

  A subframe 35 that supports the other end of the rotary drive shaft 6 is provided at the bottom of the hermetic shell 2. The subframe 35 has a disk shape that is fixed along the inner wall surface of the hermetic shell 2, and a bearing portion 36 that supports the rotary drive shaft 6 is provided at the center.

  The electric motor 5 is an inner rotor type electric motor including a stator 50 disposed along the inner peripheral surface of the hermetic shell 2 and a rotor 60 disposed coaxially in the center of the stator 50. As shown in FIG. 2, the stator 50 includes a stator core 51 having a plurality of teeth 52 arranged concentrically, and insulators 53 a and 53 b that are integrally attached to both ends of the stator core 51 in the axial direction. ing.

  The stator core 51 is formed by stacking a number of punched disk-shaped electromagnetic steel sheets along the rotation axis direction, and is formed so that the outer diameter thereof is substantially the same as the inner diameter of the sealed shell 2. . A plurality of the teeth 52 described above are provided on the inner diameter side of the stator core 51, and slots 52a for winding a coil (not shown) are formed between the teeth 52.

  A communication groove 54 is provided on the outer peripheral surface of the stator core 51 to connect the upper space (main frame 3 side) and the lower space (subframe 35 side) of the electric motor 5. As shown in FIG. 6, the communication groove 54 is a concave groove formed at both ends in the axial direction of the stator core 51, and is disposed to face each tooth 52.

  Of the communication grooves 54, one communication groove 54 a is formed as a pipe support groove 54 a for supporting the oil drainage pipe 8 described above, and has a larger width in the motor radial direction than the other communication grooves 54. preferable. According to this, since the gap of the pipe support groove 54a for supporting the oil discharge pipe 8 is formed large, assembly can be easily performed.

  The insulators 53 a and 53 b are made of a synthetic resin ring body and are fitted to both ends of the stator core 51. In this example, it is particularly preferable that the insulators 53a and 53b are made of a synthetic resin or a super engineering plastic.

  Examples of super engineering plastics include polyethylene sulfide (PPS) and liquid crystal polymer (LCP). According to this, it is possible to prevent a resin component from being deteriorated by the refrigerant or a failure due to clogging of the refrigeration cycle due to the resin component being melted into the refrigerant.

  The insulators 53a and 53b are provided with pipe support portions 55a and 55b for supporting the oil drain pipe 8. The pipe support portions 55 a and 55 b are formed at both ends on the extension line of the pipe support groove 54 a of the stator core 51.

  That is, one pipe support part 55a is formed in a tongue-like shape extending horizontally from the end of the insulator 53a in the radial direction, and a pipe insertion hole 551a through which the oil drainage pipe 8 is inserted is formed at the center. Has been. The pipe insertion hole 551a is preferably formed to have a diameter substantially the same as or slightly larger than the outer diameter of the oil discharge pipe 8. In addition to this, a slit may be formed in a part of the pipe insertion hole 551a, and a mechanism capable of elastic dimension adjustment may be used.

  The other pipe support portion 55b includes a pipe support portion member 56 that is detachably attached to the end portion of the insulator 53b, and a locking portion 551b that locks the pipe support portion member 56 to the insulator 53b.

  As shown in FIGS. 3A to 3C, the pipe support member 56 is made of a single rectangular plate, and includes a locking hole 561 locked by the locking portion 551b, and the oil discharge pipe 8. A supporting pipe support hole 562 is provided.

  The locking hole 561 is a rectangular hole formed at the center of the pipe support member 56, and both ends thereof are bent toward one surface (in this example, the upper surface) as shown in FIG. This “return” prevents the pipe support member 56 from falling off the locking portion 551b.

  The pipe support hole 562 is formed to have a size capable of supporting the drain oil pipe 8, and the diameter thereof is preferably substantially the same as or slightly larger than the outer diameter of the drain oil pipe 8. The locking part 551b is a cutout part formed by cutting out a part of the insulator 53b, and the pipe support part member 56 is held by the insulator 53b by inserting the locking hole 561 of the pipe support part member 56 therein.

  The insulators 53a and 53b are further provided with locking projections 57a and 57b as film holding means for holding the insulating film F disposed in a slot 52a formed between the teeth 52 at a predetermined position. .

  As shown in FIG. 4, the locking projections 57a and 57a are projected toward the inner wall surface of the slot 52a. One locking projection 57 a is provided on the inner peripheral surface side of the slot 52 a, and the other locking projection 57 b is integrally formed on the tip side of the tooth 52.

  According to this, when the coil is wound along the teeth 52 by hooking the latching convex portions 57a and 57a into a concave groove (not shown) formed on the insulating film F side, insulation is achieved by the winding force. Not only can the film F be prevented from shifting, but also the insulating film F can be securely held, so that the assemblability is improved.

  Referring to FIG. 1 again, the rotor 60 of the electric motor 5 is coaxially disposed at the center of the stator 50, and the rotary drive shaft 6 is integrally attached to the center. The configuration of the rotor 6 only needs to have a general configuration, and the description thereof is not necessary in this embodiment.

  The rotational drive shaft 6 of the electric motor 5 includes a main shaft 61 that is coaxially disposed with respect to the motor 5, and a crank shaft 62 that is integrally formed on the upper end side of the main shaft 61 and that is eccentrically disposed with respect to the main shaft 61. I have.

  The main shaft 61 is coaxially arranged in the electric motor chamber 22 as an output shaft of the electric motor 5, and the lower end side is inserted toward the lubricating oil O stored in the bottom of the hermetic shell 2. Inside the main shaft 61, a lubricating oil supply pipe 63 (oil guiding hole) for supplying the lubricating oil O stored in the electric motor chamber 22 to the sliding portions and the bearing portions of the compression chamber 21 is formed.

  A part of the lubricating oil supply pipe 63 is branched toward the bearing portion 31 of the main frame 3, and a part of the lubricating oil O that has gone up the lubricating oil supply pipe 63 is sent to the bearing portion 31 to be lubricated. It is like that.

  Next, an example of the assembly procedure of the scroll compressor 1 will be described with reference to FIGS. As shown in FIG. 5A, first, the stator 50 of the electric motor 5 is integrally attached to the inner peripheral surface of the hermetic shell 2 by shrink fitting.

  Next, as shown in FIG. 5B, the compression unit 4, the rotary drive shaft 6, and the compression unit incorporated in advance are inserted into the main frame 4 from the upper side of the hermetic shell 2. At this time, the tip of the drainage pipe 8 integrally attached to the main frame 3 is inserted along the pipe support hole 551a of the pipe support portion 55a provided in the insulator 53a.

  While moving the oil drain pipe 8 inserted into the pipe support hole 551a along the pipe support groove 54a, the compression unit is moved to a predetermined position, and the main frame 3 is integrally fixed to the sealed shell 2 by spot welding or the like. Let

  Next, as shown in FIG. 4 (c), the pipe support hole 562 of the pipe support member 56 is inserted from the lower end side of the oil discharge pipe 8, and the pipe support member 56 is attached to the locking portion 551b of the insulator 53b. Install. Thereby, the oil drain pipe 8 is reliably supported by the electric motor 5.

  After the oil drain pipe 8 is fixed, as shown in FIG. 4D, the subframe 34 is inserted from below the sealed shell 2 and is similarly fixed to the sealed shell 2 by spot welding or the like. Finally, the upper and lower lids of the hermetic shell 2 are covered and the inside is completely sealed to complete the scroll compressor 1.

  When the scroll compressor 1 is operated, the high-pressure refrigerant discharged into the compression chamber 21 passes through the fixed scroll 31 and the refrigerant passage 34 provided in a part of the main frame 4 into the motor upper space of the motor chamber 22. Carried. The high-pressure refrigerant carried into the electric motor chamber 22 is sent out from the refrigerant discharge pipe 24 to the refrigeration cycle.

  At this time, a part of the refrigerant in the motor upper space is carried to the motor lower space through the communication groove 54 of the stator 50 and cools the motor 5. The rotor 60 may be provided with forced circulation means such as a centrifugal fan to forcibly send the high-pressure refrigerant to the lower space of the motor 5.

  The lubricating oil O stored at the bottom of the hermetic container 2 is sucked up through the lubricating oil supply pipe 63 provided in the rotary drive shaft 6, and a part of the oil is branched in the middle, and the bearing portion 31 of the main frame 3. Lubricate. The remaining lubricating oil O is supplied to the refrigerant compression unit 4 and lubricates each sliding contact surface such as a scroll wrap of the refrigerant compression unit 4, and then passes through the oil discharge passage 33 from the storage recess 32 of the main frame 3, It can return to the bottom of the closed container 2 again through the oil drain pipe 8.

  According to this, since the oil drainage pipe is supported on the motor side, the oil drainage pipe can be easily fixed simply by being inserted into the pipe support portion of the motor, so that the product is not only easy to assemble. The finished product is less likely to vary.

  In the embodiment described above, the compressor 1 has been described by taking a scroll compressor as an example. However, the compressor of the present invention may be provided with a compression mechanism such as a rotary compressor, and holds the oil drain pipe 8 by the electric motor 5. As long as the basic configuration is provided, the configuration of the compressor itself is not particularly limited.

The sectional view showing roughly the internal structure of the compressor concerning one embodiment of the present invention. The disassembled perspective view of the stator of the electric motor of the said compressor. The front view of a pipe support part member, AA sectional view, and BB sectional drawing. The expansion perspective view which expanded a part of insulator. Explanatory drawing explaining an example of the assembly procedure of this compressor. The top view which looked at the stator core from the axial direction.

Explanation of symbols

1 Compressor (Scroll compressor)
2 Sealed Shell 3 Main Frame 33 Oil Drainage Path 4 Refrigerant Compressor 41 Fixed Scroll 42 Orbiting Scroll 5 Electric Motor (Motor)
DESCRIPTION OF SYMBOLS 50 Stator 51 Stator iron core 52 Teeth 53a, 53b Insulator 54 Communication groove 54a Pipe holding groove 55a, 55b Pipe support part 56 Pipe support part member 60 Rotor 6 Rotation drive shaft 7 Oldham ring 8 Oil drain pipe O Lubricating oil

Claims (9)

The upper side of the sealed shell is divided into a refrigerant compression section and the lower side is partitioned into an electric motor chamber. In the compressor, the lubricating oil is sucked up by the part, and the lubricating oil is returned to the bottom of the electric motor chamber through the oil discharge passage of the refrigerant compression part.
The compressor according to claim 1, wherein the electric motor is provided with a pipe support portion that supports a part of an oil drain pipe that returns the lubricating oil from the oil drain passage to the bottom of the motor chamber.   The compressor according to claim 1, wherein the pipe support portions are provided in a pair of upper and lower sides on both end sides of the stator of the electric motor.   The compressor according to claim 2, wherein any one of the pipe support portions is attached to the stator as a separate member.   4. The stator according to claim 2, wherein the stator includes a stator core and insulators that are integrally attached to both ends of the stator core in the axial direction, and the pipe support portion is provided in the insulator. The compressor described in 1.   The compressor according to claim 4, wherein the insulator is made of super engineering plastic.   A plurality of communication grooves that communicate the upper space and the lower space of the electric motor are provided on the outer peripheral surface of the stator core, and at least one of the communication grooves is for pulling out the drainage pipe into the lower space. 6. The compressor according to claim 4, wherein the lead-out groove has a width in the motor radial direction larger than that of the other communication groove.   The compressor according to claim 6, wherein each of the communication grooves is disposed so as to face a teeth portion of the stator core. An inner rotor type electric motor having a stator having a plurality of teeth and a rotor arranged coaxially in the center of the stator, wherein the upper side of the inside of the sealed shell is partitioned into a refrigerant compression section and the lower side is divided into an electric motor chamber. In the compressor motor disposed in the motor chamber of the compressor being
The stator includes a stator core having the teeth and insulators attached integrally to both ends of the stator core, and the insulator discharges the lubricating oil from the refrigerant compressor to the motor chamber. An electric motor for a compressor, wherein a pipe support portion for supporting an oil pipe is provided.   9. The compressor according to claim 8, wherein the insulator is further provided with film holding means for holding an insulating film disposed in a slot formed between the teeth in a predetermined position. For motors.

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