JP2013238178A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an Oldham ring and a main bearing member from contacting with each other near a key groove, vibrating, and increasing operation noise due to reception of a pressing force from an orbiting scroll.SOLUTION: In a scroll compressor, an orbiting scroll 12 is provided between a main bearing member 19 and a stationary scroll 11, the stationary scroll and the orbiting scroll are meshed to each other such that spiral wraps thereof inwardly face each other, an Oldham ring 26 is arranged between the main bearing member 19 and the orbiting scroll, and a key part 26a of the Oldham ring is inserted into a key groove 19a of the main bearing member. Recessed parts 26c are formed in a slidable surface part of the Oldham ring near the key part which faces a part near the key groove of the main bearing member 19. Thus, contact and vibration between the Oldham ring 26 and the main bearing member 19 which are caused near the key groove 19a can be prevented, and the scroll compressor with low noise is inexpensively provided.

Description

  The present invention relates to a scroll compressor applied to an air conditioner and a refrigeration apparatus.

  Conventionally, many applications of this type of scroll compressor have been filed, and are used in various ways as compressors for home room air conditioners and refrigerators. Recently, it has begun to be used as a compressor for automobile air conditioners.

  Such a scroll compressor performs compression by orbiting the orbiting scroll with respect to the fixed scroll, and an Oldham ring is used as a scroll rotation preventing mechanism for orbiting the orbiting scroll (for example, , See Patent Document 1).

  FIG. 10 shows a main part of the scroll compressor described in Patent Document 1, 101 is a fixed scroll, 102 is a turning scroll, 103 is an Oldham ring used for a rotation prevention mechanism of the turning scroll 102, and the turning scroll 102. And the main bearing member 104 that covers the back surface of the orbiting scroll 102. The main bearing member 104 serves as a main body frame. The Oldham ring 103 has a pair of parallel keys 105 as shown in FIG. 11, and the parallel keys 105 are slidably fitted in a key groove 106 provided in the orbiting scroll 103 so that the orbiting scroll 102 rotates. This prevents the turning scroll 102 from turning. A recess 107 is provided at the base of the parallel key 105 of the Oldham ring 103, and lubricating oil is supplied through the recess 107 to facilitate the sliding motion.

  Further, in a recent scroll compressor, as shown in FIG. 12, a pair of parallel keys 108 are provided on the surface of the Oldham ring 103 on the main bearing member 104 side, and a key groove 109 is formed on the main bearing member 104 side. By fitting a new parallel key 108 of the Oldham ring 103 to 109, a member such as a thrust bearing member disclosed in Patent Document 1 is eliminated to reduce costs.

Japanese Patent Publication No. 7-42943

  However, in the conventional scroll compressor, the orbiting scroll 102 is pressed against the main bearing member 104 side by the compression pressure fluctuation of the compression chamber formed between the orbiting scroll 102 and the fixed scroll 101 during the compression operation, and the above-described cost. In the down type scroll compressor, the Oldham ring 103 is also pressed against the main bearing member side by the movement of the orbiting scroll 102 toward the main bearing member 104, and this is instantaneously repeated as the pressure in the compression chamber changes. As a result, in the vicinity of the key groove 109 of the main bearing member 104, the vicinity of the parallel key 108 of the Oldham ring 103 and the vicinity of the key groove 109 of the main bearing 104 repeat contact / separation (vibration). There was a problem of worsening the operating noise.

The present invention solves the above-described conventional problems, and an object thereof is to provide an inexpensive and low-noise scroll compressor that suppresses contact and vibration with the Oldham ring in the vicinity of the keyway of the main bearing member. .

  In order to solve the above-described conventional problems, the scroll compressor according to the present invention is provided with a orbiting scroll between a main bearing member and a fixed scroll, and the fixed scroll and the orbiting scroll have spiral wraps inside each other. A scroll compressor in which an Oldham ring is disposed between the main bearing member and the orbiting scroll, and a key portion of the Oldham ring is inserted into a key groove of the main bearing member, A concave portion is formed in the sliding surface portion in the vicinity of the key portion of the Oldham ring opposite to the key groove vicinity portion of the main bearing member.

  As a result, even if the Oldham ring is pressed against the main bearing member, a clearance is secured between the key groove vicinity of the main bearing member and the key portion of the Oldham ring due to the presence of the recess, thereby suppressing contact and vibration between the two. It is possible to prevent the operating noise from deteriorating.

  The scroll compressor of the present invention provides an inexpensive and low-noise scroll compressor that can suppress the generation of sound due to vibration of the Oldham ring even when the Oldham ring is pressed against the main bearing member and causes vibration. it can.

1 is a cross-sectional view of a scroll compressor according to Embodiment 1 of the present invention. The exploded perspective view which looked at the main bearing member part of the scroll compressor in Embodiment 1 from the main bearing member side The exploded perspective view which looked at the main bearing member part of the scroll compressor in Embodiment 1 from the turning scroll side The perspective view of the Oldham ring of the scroll compressor in Embodiment 1 The front view when an Oldham ring is piled up on the main bearing member of the scroll compressor in Embodiment 1 AA sectional view of FIG. BB sectional view of FIG. The front view when an Oldham ring is piled up on the main bearing member of the scroll compressor in Embodiment 1 CC sectional view of FIG. A longitudinal sectional view showing the main part of a conventional scroll compressor A perspective view showing an Oldham ring of a conventional scroll compressor Exploded perspective view of a main bearing member showing an example of a cost reduction type of a conventional scroll compressor

  According to a first aspect of the present invention, a orbiting scroll is provided between a main bearing member and a fixed scroll, and the fixed scroll and the orbiting scroll mesh with each other with spiral wraps inside, and the main bearing member and the orbiting scroll. A scroll compressor in which an Oldham ring is arranged between the scroll and a key portion of the Oldham ring is inserted into a key groove of the main bearing member, and is opposed to the vicinity of the key groove of the main bearing member. Even if the Oldham ring vibrates in the vicinity of the key groove of the main bearing member due to the pressing force from the orbiting scroll, the sliding surface portion near the key portion of the Oldham ring is formed. Since the gap is secured by the recess between the portion near the key portion of the Oldham ring and the portion near the key portion of the main bearing member, the portion near the key portion of the Oldham ring Does not contact with the main bearing member, it is possible to suppress the generation of a result contact sound, it is possible to provide a scroll compressor of low noise.

  According to the second invention, the range of the concave portion of the sliding surface portion in the vicinity of the key portion of the Oldham ring of the first invention is symmetric with respect to the key portion, and the width within about 60% of the Oldham ring diameter. The Oldham's ring can be prevented from swinging and coming into contact with the main bearing member when it receives a pressing force from the orbiting scroll. A compressor can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In the present invention, a horizontally installed scroll compressor will be described as an example, but other forms may be used.

(Embodiment 1)
FIGS. 1-8 is an example of the scroll compressor of Embodiment 1, and shows an example of the horizontal scroll compressor installed sideways by the attachment leg 2 around the trunk | drum of the scroll compressor 1. FIG.

  The scroll compressor 1 includes a compression mechanism section 4 and a motor 5 for driving the compression mechanism section 4 in the main body casing 3, and a liquid storage section 6 for storing liquid for lubrication of each sliding section including the compression mechanism section 4. The motor 5 is driven by a motor drive circuit unit (not shown). The motor 5 includes a stator 5a fixed in the main body casing 3 and a rotor 5b that rotates integrally with the drive shaft 14.

  The refrigerant to be handled is a gas refrigerant, and a liquid such as a lubricating oil 7 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 7 is compatible with the refrigerant. However, in this invention, if it is lubricating oil, it will not be restricted to these.

  In the present embodiment, a compressor having a scroll will be described. Basically, a compressor mechanism 4 that sucks, compresses, and discharges refrigerant, a motor 5 that drives the compressor mechanism 4, and a compressor. Any scroll compressor may be used as long as it has a liquid storage section 6 for storing a liquid used for lubrication of each sliding section including the mechanism section 4 in the main body casing 3 and the motor 5 is driven by a motor drive circuit section.

  In the main casing 3, a main bearing member 19 having a pump 13, a secondary rolling bearing 21, a motor 5, and a main rolling bearing 22 is arranged from one end wall side in the axial direction of the main casing 3. is there. The pump 13 is housed from the outer surface of the end wall and is held between the lid body 16 and the pump body 17 that is fitted thereafter, and a pump chamber 17 that leads to the liquid storage section 6 is formed inside the lid body 16 to form a suction passage 18. Through the liquid reservoir 6. The auxiliary rolling bearing 21 is supported by an end wall, and the side connected to the pump 13 of the drive shaft 14 is supported. The motor 5 fixes the stator 5 a to the inner periphery of the main body casing 3, and the drive shaft 14 can be rotationally driven by a rotor 5 b fixed around the middle of the drive shaft 14.

  The main bearing member 19 is fixed to the inner periphery of the sub casing 28 with a bolt or the like, and the compression mechanism portion 4 side of the drive shaft 14 is supported by the main rolling bearing 22. The fixed scroll 11 is attached to the outer surface of the main bearing member 19 with a bolt or the like (not shown), the orbiting scroll 12 is sandwiched between the main bearing member 19 and the fixed scroll 11, and the fixed scroll 11 and the orbiting scroll 12 are Are scroll-compressed by meshing them with the spiral wraps facing each other. An Oldham ring 26 is provided between the main bearing member 19 and the orbiting scroll 12 to prevent the orbiting scroll 12 from rotating and to orbit.

  An eccentric shaft 14a is integrally formed at the end of the orbiting scroll of the drive shaft 14, and a bush 20 is fitted and supported on the eccentric shaft 14a. The orbiting scroll 12 is supported on the bush 20 via an eccentric rolling bearing 23 so that the orbiting scroll 12 faces the fixed scroll 11. An eccentric rolling bearing 23 is accommodated on the back surface of the orbiting scroll 12. The motor side exposed portion of the compression mechanism section 4 from the sub casing 28 is covered with the main casing 3 which is fixed to the sub casing 28 with a bolt (not shown).

  The compression mechanism unit 4 is located between the suction port 8 of the sub casing 28 and the discharge port 9 of the main casing 3, and its own suction port (not shown) is connected to the suction port 8 of the sub casing 28. Opens the compressed gas to the discharge chamber 25 via the reed valve 24a. The discharge chamber 25 is on the side of the motor 5 having the discharge port 9 between the compression mechanism 4 and the end wall through the fixed scroll 11 and the main bearing member 19 or a communication passage 27 formed between them and the main body casing 3. Leads to.

  Further, the Oldham ring 26 provided between the main bearing member 19 and the orbiting scroll 12 and constituting the rotation preventing mechanism of the orbiting scroll 12 is paired at a position where the both surfaces thereof are orthogonal to each other as shown in FIGS. The first key portion 26a and the second key portion 26b, the first key portion 26a in the key groove 19a provided in the main bearing member 19, and the second key portion 26b in the key groove 12a of the orbiting scroll 12, respectively. It is slidably fitted to prevent the orbiting scroll from rotating and to rotate.

  Here, the Oldham ring 26 is made by a manufacturing method such as sintering. For reasons of the manufacturing method, the flatness in the vicinity of the left and right sides of the key portions 26a and 26b shown in FIGS. The back side of the key part 26b tends to have good flatness. Accordingly, when the Oldham ring 26 slides on the main bearing member 19, the Oldham ring sliding surface of the main bearing member 19 is located near the left and right sides of the key portion 26a of the Oldham ring 26 in the vicinity of the key groove 19a on the main bearing member 19 side. It is easy to come into contact with 19x.

  Therefore, the sliding surface 26d of the Oldham ring 26 is formed with a concave portion 26c having a width of about 50 mm and a depth of 0.4 mm at a symmetrical portion with respect to the key portion 26a. In order to absorb the hit of the main bearing member 19 against the Oldham ring sliding surface 19x due to the poor flatness near the left and right of 26a, a gap is formed between them.

  About the scroll compressor 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated.

  First, the motor 5 is driven by the motor drive circuit unit, and the orbiting scroll 12 of the compression mechanism unit 4 is rotated through the drive shaft 14 and the pump 13 is driven. The compression mechanism section 4 of the scroll compressor 1 includes a compression space 10 formed by meshing the spiral wraps of the fixed scroll 11 and the orbiting scroll 12, and the fixed scroll 11 is driven by the motor 5 via the drive shaft 14. The suction port 8 provided in the sub-casing 28 and the main casing have the suction, compression, and discharge to the external cycle of the refrigerant returning from the external cycle by changing the volume with movement when the swivel motion is performed. This is performed through the discharge port 9 provided in FIG.

  At the same time, the lubricating oil 7 stored in the liquid storage section 6 of the main casing 3 drives the pump 13 or the like with the driving shaft 14 or uses the differential pressure in the main casing 3 to drive the driving shaft. 14 is supplied to the back surface of the orbiting scroll 12 as the orbiting scroll 12 is driven to rotate through the drive shaft oil supply path 15.

  At this time, the compression mechanism unit 4 is supplied with the lubricating oil 7 of the liquid storage unit 6 by the pump 13 and receives the lubrication and sealing action, while the suction port 8 of the subcasing 28 and the suction port provided in the fixed scroll 11 thereof. The return refrigerant from the refrigeration cycle is sucked and compressed, and discharged from its discharge port 24 to the discharge chamber 25. The refrigerant discharged into the discharge chamber 25 enters the motor 5 side through the communication passage 27 and is discharged from the discharge port 9 of the main casing 3 while cooling the motor 5. In this process, the refrigerant undergoes gas-liquid separation such as collision and throttling and the lubricating oil 7 is separated, while the auxiliary rolling bearing 21 is also lubricated by the accompanying partial lubricating oil 7.

  Here, in this scroll compressor, since the recess 26c is formed with a width of about 50 mm and a depth of 0.4 mm on the sliding surface 26d of the symmetrical part with respect to the key part 26a of the Oldham ring 26, the orbiting scroll. Even if the Oldham ring 26 vibrates in the vicinity of the key groove 19a of the main bearing member 19 by repeatedly receiving the pressing force from the main bearing member 19, the vicinity of the second key portion 26a of the Oldham ring 26 and the main shaft are difficult to produce. Since a gap is secured between the left and right portions of the keyway 19a of the receiving member 19 by the recess 26c of the Oldham ring 26, the Oldham ring 26 does not contact the main bearing member 19 and no contact noise is generated.

  The depth of the recess 26c of the Oldham ring 26 may be deep enough to absorb the vibration of the Oldham ring 26. In the experimental results, the generation of vibration noise is suppressed if the depth is about 0.2 mm to 0.5 mm. Was confirmed. Further, as a result of experiments, it was found that the width of the concave portion 26c may be within about 60%, preferably within 45% of the diameter of the Oldham ring 26. When the width of the recess 26c is 60% or more, the area of the sliding surface 26d other than the recess 26c of the Oldham ring 26 decreases, and when the Oldham ring 26 receives a pressing force from the orbiting scroll 12, the recess 26c. Oscillating vibration is generated with the sliding surface 26d other than the fulcrum as a fulcrum, and the Oldham ring sliding of the main bearing member 19 is in the vicinity of the second key portion 26a of the Oldham ring 26 despite the provision of the recess 26c. There is a risk of contact noise being generated in contact with the surface 19x, but if it is within 60%, a sufficient contact area with the Oldham ring sliding surface 19x is secured and the portion is used as a fulcrum. It is possible to suppress the generation of sound due to the rocking vibration of the Oldham ring 26 and reliably prevent contact noise.

  As described above, in the present embodiment, the left and right sliding surfaces 26d of the key portion 26a provided on the surface of the Oldham ring 26 on the side of the main bearing member 19 have a width of about 50 mm symmetrically with respect to the key portion 26a. Since the recess 26c is formed at a depth of 0.4 mm, the portion near the key portion 26a of the Oldham ring 26 does not contact the main bearing member 19, and no contact noise is generated. Therefore, the compressor can be reduced in noise, which is suitable for a compressor of an air conditioner for vehicles.

  In each of the above-described embodiments, the motor casing is incorporated in the main body casing. However, the motor may not be built in or may be driven by another driving source.

  As described above, the scroll compressor according to the present invention provides an inexpensive and low-noise scroll compressor that suppresses contact and vibration with the main bearing member of the Oldham ring in the vicinity of the key groove of the main bearing member. Therefore, the working fluid is not limited to the refrigerant, and can be widely applied to applications of scroll fluid machines such as an air scroll compressor, a vacuum pump, and a scroll type expander.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Mounting leg 3 Main body casing 4 Compression mechanism part 5 Motor 5a Stator 5b Rotor 6 Liquid storage part 7 Lubricating oil 8 Suction port 9 Discharge port 10 Compression space 11 Fixed scroll 12 Orbiting scroll 13 Pump 14 Drive shaft 14a Eccentric shaft DESCRIPTION OF SYMBOLS 15 Drive shaft oil supply path 16 Cover body 17 Pump chamber 18 Suction passage 19 Main bearing member 19a Key groove of main bearing member 19x Oldham ring sliding surface of main bearing member 20 Bush 21 Sub rolling bearing 22 Main rolling bearing 23 Eccentric rolling bearing 24 Fixed Scroll Discharge Port 24a Reed Valve 25 Discharge Chamber 26 Oldham Ring 26a, 26b Oldham Ring Key Part 26c Oldham Ring Sliding Surface Recess 26d Oldham Ring Sliding Surface 27 Communication Path 28 Subcasing

Claims (2)

A orbiting scroll is provided between the main bearing member and the fixed scroll, and the fixed scroll and the orbiting scroll mesh with each other with spiral wraps inside each other, and between the main bearing member and the orbiting scroll. A scroll compressor in which an Oldham ring is arranged and a key portion of the Oldham ring is inserted into a key groove of the main bearing member, and in the vicinity of the key portion of the Oldham ring facing the key groove vicinity portion of the main bearing member The scroll compressor which formed the recessed part in the sliding surface part. The scroll compression according to claim 1, wherein the range of the concave portion formed in the sliding surface portion in the vicinity of the key portion of the Oldham ring is formed with a width within about 60% of the diameter of the Oldham ring symmetrically with respect to the key portion. Machine.