JP2007224798A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a scroll compressor at low cost while maintaining the reliability and accuracy of a thrust bearing member. <P>SOLUTION: The scroll compressor 1 is provided with a compression mechanism 2 including a fixed scroll and a turning scroll 5, a crank shaft 8 driving a compression mechanism 2, the thrust bearing member 90 supporting an axial direction load of a crank shaft 8, and a frame 7 supporting a radial direction load of a crankshaft 8. The thrust bearing member 90 is manufactured of a part joining a plurality of press formed steel plates. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor, and is particularly suitable for a scroll compressor provided with a thrust receiving member that supports a thrust load acting on a crankshaft.

  A conventional scroll compressor includes a compression mechanism including a fixed scroll and a turning scroll, a crankshaft that drives the compression mechanism, a frame that supports a radial load of the crankshaft, and a thrust that supports an axial load of the crankshaft. A receiving member and a thrust bearing provided between the crankshaft and the thrust receiving member are provided. The thrust receiving member is formed of a cast product, and is fixed to the frame.

  A specific structure of a conventional thrust receiving member will be described with reference to FIG. FIG. 3 is a front view and a cross-sectional view of a thrust receiving member used in a conventional scroll compressor.

  The conventional thrust receiving member 87 is manufactured by cutting a member formed of a casting, and since the dimensional tolerance of the casting background is large, the surfaces 87a to 87e are processed to obtain dimensional accuracy. The surface 87a is a surface constituting a hole into which the crankshaft is inserted, the surfaces 87b and 87c are contact surfaces with the frame, and the surfaces 87e and 87f are contact surfaces with the thrust bearing 86. In particular, the surface 87c serves as a guide when fitting into the inner diameter of the frame 7, whereby the thrust receiving member 87 can be easily positioned with respect to the frame 7. Further, the surface 87e plays a role of positioning the thrust bearing. The thrust receiving member 87 is provided with a detent 88 for the thrust bearing 86.

  In addition, as patent document relevant to a prior art, Unexamined-Japanese-Patent No. 2004-293530 (patent document 1) is mentioned, for example.

JP 2004-293530 A

  However, the conventional scroll compressor described above is expensive because the thrust receiving member is formed of a cast product. That is, the thrust receiving member is a component that requires high precision in consideration of fitting with the inner diameter of the frame and prevention of contact with the crankshaft, and therefore, it is necessary to cut the cast member with high precision. Processing was cumbersome and expensive.

  Although it is conceivable to produce a thrust receiving member by pressing a single steel plate, the shape becomes complicated to satisfy the required function of the thrust receiving member in the scroll compressor, and the reliability of the thrust receiving member In addition, it is difficult to manufacture while maintaining accuracy.

  An object of the present invention is to obtain a scroll compressor that can be manufactured at low cost while maintaining the reliability and accuracy of a thrust receiving member.

  In order to achieve the above object, a first aspect of the present invention includes a compression mechanism having a fixed scroll and a turning scroll, a crankshaft that drives the compression mechanism, and a thrust receiver that supports a load in the thrust direction of the crankshaft. In the scroll compressor including a member and a frame that supports the thrust receiving member, the thrust receiving member is formed by joining a plurality of steel plates.

A more preferable specific configuration example in the first aspect of the present invention is as follows.
(1) A thrust bearing is provided between the crankshaft and the thrust receiving member.
(2) The plurality of steel plates constituting the thrust receiving member are joined by projection or spot welding.
(3) In the above (1), the thrust receiving member includes a load support plate that supports an axial load, and a positioning plate that is disposed on one side of the load support plate and has a central hole for fitting a thrust bearing. Must be constructed.
(4) In (3), the positioning plate is disposed so as to be inserted into the frame, and the outer peripheral edge of the positioning plate is formed so as to match the shape of the thrust receiving member insertion portion of the frame. .
(5) In the above (3), the load supporting plate and the positioning are formed by fitting a protrusion provided on the load supporting plate or the positioning plate into a notch or a hole provided on the positioning plate or the load supporting plate. The board is positioned.

Moreover, the 2nd aspect of this invention is a compression mechanism which has a fixed scroll and a turning scroll,
A crankshaft that drives the compression mechanism, a main bearing that supports a radial load of the crankshaft, a thrust bearing that supports a thrust load of the crankshaft, a thrust receiving member that supports the thrust bearing, In a scroll compressor including a frame for supporting a thrust receiving member, the thrust receiving member includes a load supporting plate made of a press-formed steel plate having a surface that receives the thrust bearing in an axial direction and a contact surface to the frame. And a positioning plate made of a press-formed steel plate having a radial positioning inner circumferential surface of the thrust bearing.

  According to the scroll compressor of the present invention, the thrust receiving member can be manufactured at low cost while maintaining the reliability and accuracy.

  Hereinafter, a scroll compressor according to an embodiment of the present invention will be described with reference to the drawings.

  First, the entire scroll compressor of this embodiment will be described with reference to FIG. FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.

  The scroll compressor 1 is configured by housing a compression mechanism 2, an electric motor 3, a sub-bearing portion 4, and an oil supply mechanism in an airtight container 100. The scroll compressor 1 of the present embodiment is a vertical scroll compressor in which a compression mechanism 2 and an electric motor 3 are arranged up and down.

  The compression mechanism 2 includes a turning scroll 5, a fixed scroll 6, a frame 7, a crankshaft 8, a turning bearing 13, and a turning mechanism 9. The compression mechanism 2 forms a compression chamber 81 by combining the fixed scroll 6 and the orbiting scroll 5.

  The orbiting scroll 5 includes a spiral wrap 11, an end plate 10, and a shaft support portion (boss portion) 5a. The wrap 11 is erected vertically on one side of the end plate 10, and the shaft support portion 5 a is erected vertically on the other side of the end plate 10. On the back side of the end plate 10 of the orbiting scroll 5, an orbiting mechanism 9 and an orbiting bearing 13 into which the crank portion 12 of the crankshaft 8 is inserted are provided.

  The fixed scroll 6 includes a spiral wrap 15, an end plate 14, a suction port 16, and a discharge port 17, and is fixed to the frame 7 via bolts. Thus, the orbiting scroll 5 is sandwiched between the fixed scroll 6 and the frame 7 so as to be capable of orbiting. The wrap 15 is erected vertically on one side of the end plate 14. A suction pipe 85 provided in the sealed container 100 is connected to the suction port 16 of the fixed scroll 6. Further, the sealed container 100 is provided with a discharge pipe 22 that communicates with the space between the frame 7 and the electric motor 3.

  The outer periphery of the frame 7 is fixed to the sealed container 100, and the inner bearing supports the main bearing 63. The inner diameter portion of the frame 7 that supports the main bearing 63 covers the frame 7 on the outer periphery and the upper surface of the main bearing 63, and the lower surface is opened so that the main bearing 63 can be fitted. The lower surface of the main bearing 63 is covered with a thrust receiving member 84.

  The thrust receiving member 84 is detachably attached to the frame 7 using bolts 94 so as to hold the main bearing 63 from below. A thrust bearing 86 is provided between the thrust receiving member 84 and the crankshaft 8 (between the thrust receiving member 84 and the main bearing 63), and the axial load of the crankshaft 8 is applied to the thrust bearing 86 and the thrust receiving member. 84. A radial position of the thrust bearing 86 is positioned by a thrust receiving member 84.

  The main bearing 63 is composed of a rolling bearing and is provided on one side of the electric motor, specifically, to support the crankshaft 8 between the electric motor 3 and the orbiting scroll 5. The main bearing 63 is provided by fitting into the inner diameter of the frame 7 from below.

  The crankshaft 8 has a crank portion 12 at the upper portion of the main shaft portion, and drives the orbiting scroll 5 by connecting the crank portion 12 to the orbiting scroll 5. The crank portion 12 is inserted into and supported by the swivel bearing 13.

  The electric motor 3 constitutes a rotational drive means for driving the compression mechanism 2 via the crankshaft 8 and has a stator 18 and a rotor 19 as basic elements. The stator 18 is attached to the sealed container 100. The outer peripheral surface of the stator 18 is formed in close contact with the inner peripheral surface of the sealed container 100.

  The auxiliary bearing portion 4 is provided so as to support the crankshaft 8 on the other side of the electric motor 3. The auxiliary bearing portion 4 includes an auxiliary bearing 51, an auxiliary bearing housing 52 into which the auxiliary bearing 51 is inserted, and a lower frame 53 fastened to the auxiliary bearing housing 52. The lower frame 53 is fixed to the sealed container 100. Thus, the crankshaft 8 is pivotally supported on both sides of the electric motor 3 by the main bearing 63 and the auxiliary bearing 51, and the crank portion 12 at the upper end is pivotally supported by the swing bearing 13.

  When the crankshaft 8 is rotated by the rotation of the electric motor 3, the orbiting scroll 5 performs the orbiting motion with respect to the fixed scroll 6 while maintaining the posture by the function of the orbiting mechanism 9. A balance weight 20 is attached between the rotor 19 and the orbiting scroll 5 and a rotor balance weight 21 is attached to the rotor 19 in order to cancel out the unbalanced force generated by the orbiting motion.

  The compression chamber 81 configured by meshing the fixed scroll 6 and the orbiting scroll 5 is subjected to a compression operation in which the volume thereof is reduced by the orbiting movement of the orbiting scroll 5. In this compression operation, the working fluid is sucked into the compression chamber 81 from the suction port 16 along with the turning motion of the orbiting scroll 5, and the sucked working fluid passes through the compression process from the discharge port 17 of the fixed scroll 6 to the sealed container 100. It is discharged into the inner discharge space and further discharged from the sealed container 100 via the discharge pipe 22. As a result, the space in the sealed container 100 is maintained at the discharge pressure.

  The oil supply mechanism includes an oil supply pump 83, an oil supply hole 61, and an oil discharge pipe 60. The oil supply pump 83 is provided to forcibly supply the lubricating oil stored in the oil sump 82 through the oil supply hole 61 to the auxiliary bearing 51, the slewing bearing 13 and the main bearing 63 for lubrication. The oil supplied to the oil supply hole 61 is also supplied to the sliding portion between the orbiting scroll 5 and the fixed scroll 6. The oil supply hole 61 is provided with a lateral oil supply hole that communicates with the auxiliary bearing 51.

  The oil drain pipe 60 is provided so as to guide the oil lubricated to the main bearing 63 to the oil sump 82 of the hermetic container 100 through the recess 18 a on the outer periphery of the stator of the electric motor 3.

  The end of the horizontal portion 60 a of the oil drain pipe 60 is attached to a portion of the frame 7 that covers the main bearing 63. The mounting portion of the oil drain pipe 60 is formed in a cylindrical shape and is mounted by being press-fitted into a circular hole formed in the frame 7. With this mounting structure, the oil drain pipe 60 can be easily and securely mounted to the frame 7. The mounting portion of the oil drain pipe 60 is opened in the frame 7, and oil that has lubricated the main bearing 63 is introduced into the oil drain pipe 60 through the opening.

  The vertical portion 60 b of the oil draining pipe 60 extends vertically along the inner wall surface of the sealed container 100, passes between the end coil portion 18 c of the stator 18 and the sealed container 100, and further, the recess 18 a on the outer periphery of the stator of the electric motor 3. It extends to the lower part of the electric motor 3 through. Further, the lower end portion of the oil drain pipe 60 is fixed by a pipe presser 65 attached to the lower frame 53.

  Next, the details of the thrust receiving member 90 will be described with reference to FIG. FIG. 2 is a front view and a sectional view of a thrust member used in the scroll compressor of FIG.

  The thrust receiving member 90 is manufactured by joining two press-formed steel plates. The thrust receiving member 90 includes a load support plate 91 and a positioning plate 92. The load support plate 91 is formed by press drawing and press punching with a member thicker than the positioning member 92 in order to ensure the strength for supporting the axial load. The positioning plate 92 is configured by press punching into a flat plate shape with a member thinner than the load support plate 91 in order to ensure the fitting accuracy with the thrust bearing 86 and the frame 7.

  The load support plate 91 includes an upper surface, a stepped side surface, and a flange surface, and includes a contact surface 91b that is a contact surface with the frame 7 and a contact surface 91c that is a contact surface with the thrust bearing 86. Yes. Since the two contact surfaces 91b and 91c are formed by the flange surface and the upper surface of the draw-supported load support plate 91, the surface accuracy can be increased. Since the contact surface 91c is a receiving surface of the thrust bearing 86, the step surface is slightly stepped to form an extruded surface.

  The surface 91a constitutes the outer peripheral edge of the load support plate 91 and is formed by press punching. The surface 91d constitutes a central hole (thrust bearing interior portion) of the load support plate 91, and is formed by press punching.

  The positioning plate 92 has a contact surface 92 a that is a fitting surface with the frame 7 and a contact surface 92 c that is a positioning surface with the thrust bearing 86. The contact surface 92 a is formed at the outer peripheral edge of the positioning plate 92 and serves as a guide when the positioning plate 92 is fitted into the inner diameter of the frame 7. Accordingly, the thrust receiving member 90 can be easily and accurately positioned with respect to the frame 7. The contact surface 92c serves to prevent the thrust bearing 86 from moving in the horizontal direction. The contact surface 92c is formed at the inner periphery of the positioning plate 92, and the thrust bearing 86 can be easily and accurately positioned with respect to the thrust receiving member 90.

  On the upper surface of the load support plate 91, a plurality of protrusions 91e are formed by press half punching. A plurality of notches 92 d corresponding to the protrusions 91 e are formed on the inner peripheral edge of the positioning plate 92. By fitting the protrusion 91 e of the load support plate 91 into the notch 92 d of the positioning plate 92, the load support plate 91 and the positioning plate 92 are positioned. In addition, it is good also as a hole instead of the notch 92d.

  The load support plate 91 and the positioning plate 92 are joined by projection welding 93. Note that spot welding may be used instead of projection welding 93. Reference numeral 88 denotes a rotation stopper for the thrust bearing 86.

  The scroll compressor 1 according to this embodiment described above includes a compression mechanism 2 including a fixed scroll 6 and a turning scroll 5, a crankshaft 8 that drives the compression mechanism 2, and a frame 7 that supports a radial load on the crankshaft 8. , And a thrust receiving member 90 that supports the axial load of the crankshaft 8, and the thrust receiving member 90 can be made of a joined product of a plurality of press-formed steel sheets, so that it can be made a part that does not require cutting. High-reliability and high-accuracy thrust receiving members that satisfy the same functions as products can be manufactured at low cost.

It is a longitudinal cross-sectional view of the scroll compressor of one Embodiment of this invention. It is the front view and sectional drawing of a thrust member used for the scroll compressor of FIG. It is the front view and sectional drawing of a thrust receiving member used for the conventional scroll compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Scroll compressor, 2 ... Compression mechanism, 3 ... Electric motor, 4 ... Sub bearing part, 5 ... Revolving scroll, 5a ... Shaft support part, 6 ... Fixed scroll, 7 ... Frame, 8 ... Crankshaft, 9 ... Revolving mechanism DESCRIPTION OF SYMBOLS 10 ... End plate, 11 ... Lap, 12 ... Crank part, 13 ... Slewing bearing, 14 ... End plate, 15 ... Lap, 16 ... Inlet, 17 ... Discharge port, 18 ... Stator, 18a ... Notch, 19 ... Rotor, DESCRIPTION OF SYMBOLS 20 ... Balance weight, 21 ... Rotor balance weight, 22 ... Discharge pipe, 51 ... Bearing, 52 ... Sub bearing housing, 53 ... Lower frame, 60 ... Oil drain pipe, 61 ... Oil supply hole 63 ... Main bearing, 65 ... Pipe presser , 81 ... Compression chamber, 82 ... Oil sump, 83 ... Oil pump, 84 ... Thrust receiving member, 85 ... Suction pipe, 86 ... Thrust bearing, 87 ... Thrust receiving member, 88 ... Non-rotating, 90 ... Thrust Only member, 100 ... sealed container.

Claims (7)

A compression mechanism having a fixed scroll and an orbiting scroll;
A crankshaft for driving the compression mechanism;
A thrust receiving member that supports a load in the thrust direction of the crankshaft;
In a scroll compressor comprising a frame that supports the thrust receiving member,
The scroll compressor, wherein the thrust receiving member is constituted by joining a plurality of press-formed steel plates.   2. The scroll compressor according to claim 1, wherein a thrust bearing is provided between the crankshaft and the thrust receiving member.   2. The scroll compressor according to claim 1, wherein the plurality of steel plates constituting the thrust receiving member are joined by projection or spot welding.   3. The thrust receiving member according to claim 2, wherein the thrust receiving member is joined to a load supporting plate that supports an axial load and a positioning plate that is disposed on one side of the load supporting plate and has a central hole for fitting the thrust bearing. A scroll compressor characterized by being configured.   5. The positioning plate according to claim 4, wherein the positioning plate is disposed so as to be inserted into the frame, and an outer peripheral edge of the positioning plate is formed to match a shape of a thrust receiving member insertion portion of the frame. Scroll compressor.   The positioning of the load support plate and the positioning plate according to claim 4 by fitting a protrusion provided on the load support plate or the positioning plate into a notch or a hole provided in the positioning plate or the load support plate. Scroll compressor characterized by being made. A compression mechanism having a fixed scroll and an orbiting scroll;
A crankshaft for driving the compression mechanism;
A main bearing that supports a radial load of the crankshaft;
A thrust bearing for supporting a load in the thrust direction of the crankshaft;
A thrust receiving member for supporting the thrust bearing;
In a scroll compressor comprising a frame that supports the thrust receiving member,
The thrust receiving member has a surface that receives the thrust bearing in the axial direction and a load supporting plate made of a press-formed steel plate having a contact surface with the frame, and a press-forming that has a radial positioning inner peripheral surface of the thrust bearing. A scroll compressor comprising a steel plate and a positioning plate joined thereto.

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