JPH09151884A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of an oil pump, to enhance processability accompanied by simplification of an assembly form, and to reduce a cost and weight. SOLUTION: A scroll compression element driven by the crank shaft of a motor-driven element is contained in the inner upper part of a closed container, the inner bottom of which forms the oil reservoir of oil for lubrication. Oil for lubrication raised from an oil reservoir by an oil mechanism 50 is fed to the compression chamber of the scroll compression element. The oil pump mechanism is formed in such a manner that a bearing plate 51, a cylinder chamber 52 formed in the bearing plate 51, a rotor 54 arranged in the cylinder chamber 53, a thrust plate 56 brought into slidable contact with the rotor 54, and a cover member 57 with which the cylinder chamber 53 is covered in cooperation with the thrust plate 56 are assembled together by means of bolts 59 for integral formation. The thrust plate 56 and the cover member 57 are respectively formed of a material produced by press-punching a steel sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor mounted on, for example, an air conditioner or a refrigerator.
In particular, by improving the structure of the displacement type oil pump mechanism that is integrated with the bearing plate, the passage resistance of the flow rate during variable speed operation from low speed to high speed due to the inverter specifications is reduced, and the oil pump efficiency is improved. In addition to improving the workability, the workability associated with the simplification of the assembling form is improved, and the cost and weight are reduced.

[0002]

2. Description of the Related Art Conventionally, in this type of scroll compressor, a scroll compression element housed in an upper part of a hermetically sealed container is driven by a crankshaft of an electric element, and at the same time, the crankshaft is driven by the crankshaft. There is a structure having a capacity type oil pump mechanism in which the lubricating oil stored in the bottom oil reservoir is supplied to the scroll compression element side.

As shown in FIG. 25, a conventional displacement type oil pump mechanism is a bearing plate a.
A cylinder chamber b is integrally formed in the cylinder chamber b, a rotor c is incorporated in the cylinder chamber b, and the cylinder chamber b in which the rotor c can swing is covered with a thrust plate d and a cover member e. Is fixed to the bearing plate a with bolts f and assembled, while the lubricating oil O sucked into the cylinder chamber b from the oil suction port g provided in the cover member e is supplied to the crankshaft h of the electric element (not shown). The rotor c, which is interlocked with the eccentric shaft portion, is lifted by the intake and discharge by the revolution of the rotor c, and oil is supplied to the scroll compression element (not shown) side through the oil passage i of the crankshaft h.

Further, in the oil pump mechanism, a relief valve j opened by the cover member e is closed by a relief valve k to reduce an input during high speed operation, and the reed valve k is closed by a spring holder l. A float-type relief mechanism that is urged by a retained spring m is provided to prevent oil compression by opening the relief valve k above a certain load and discharging the oil when the oil supply is excessive. It is supposed to do.

[0005]

However, in the oil pump mechanism in the scroll compressor having the above-mentioned conventional structure, the cover member e, which is a component of the oil pump, is made of an aluminum die-cast product, and therefore the number of processing steps is increased. However, the cost is high and the overall weight is increased.

Moreover, in the float type relief mechanism as described above, not only the number of components to be assembled is complicated and the structure is complicated, but also when only the reed valve is used,
If the relief groove is circular, the passage resistance of the flow rate increases.

Further, the bearing plate a has a plurality of (for example, three) fixed legs a2 extending from the central shaft portion a1.
In the case of the form having the above, when the cover member e is assembled with the bolt f, when the bolt hole is drilled, the bolt hole position can also be used for mounting the reed valve as the relief mechanism. If the position and the protruding direction of the fixed leg a2 are neglected, the length of the reed valve is restricted or the bearing plate a has a small amount of padding, resulting in an increase in weight.

Further, in the conventional oil pump mechanism, as shown in FIG.
6 and FIGS. 27 (A) (B) (C) (D),
The width of the vane c1 projected on the rotor c is made narrower than the width of the vane throat b1 provided on the inner peripheral side wall of the cylinder chamber b, so that the vane throat b1 has a straight shape extending straight toward the root c2 side. , The vane throat b1 side is also straight, and a sufficient gap is provided between the vane throat b1 side and the gap.
The vane c1 is prevented from collapsing when it is discharged from the inside.

However, in such a vane configuration, in the oil discharge process shown in FIG. 27D, as shown in FIG. 28, the corner edge portion c3 of the vane root portion c2 interferes with the cylinder chamber b, and the vane is formed. Not only the swing of c1 cannot be performed smoothly, but also the mutual interference portions are heavily worn. Therefore, a relief portion is cut out on the corner edge portion c3 side of the vane root portion c2, or the vane throat b1 side edge portion is formed. Must be chamfered, which reduces oil pump efficiency

An object of the present invention is to provide a scroll compressor which can improve the efficiency of the oil pump, improve the workability associated with the simplification of the mounting form, and reduce the cost and the weight. is there.

[0011]

In order to solve the above-mentioned problems, the present invention is driven by a crankshaft of an electric element in an upper portion of a closed container having an inner bottom surface as an oil reservoir for lubricating oil. A scroll compression element composed of a fixed scroll and an orbiting scroll is housed, the refrigerant gas sucked in the compression chamber of the scroll compression element is compressed, and the compression chamber rises from the oil reservoir by an oil pump mechanism. In a scroll compressor in which lubricating oil is supplied through an oil passage that penetrates along the axial direction in the crankshaft, the oil pump mechanism is fixed to an inner peripheral side surface on the inner bottom surface side in the closed container. A bearing plate in which the lower end of the crankshaft is rotatably supported in the bearing hole, a cylinder chamber formed in the bearing plate, A rotor housed in the cylinder chamber and revolving around the lower end of the crankshaft and swingably revolving, a thrust plate slidably opposed to the rotor, and a cover for covering the cylinder chamber together with the thrust plate. The thrust plate and the cover member are integrally formed by assembling with a member by a bolt, and the thrust plate and the cover member are respectively formed by press punching material of a steel plate. The thrust plate communicates with the oil passage of the crankshaft. The cover member has a hole and second and third holes that respectively communicate with the oil suction port cutout and the oil discharge port cutout formed on the inner peripheral side wall surface of the cylinder chamber. An oil suction hole communicating with the second oil suction hole of the thrust plate, and a third oil suction hole of the thrust plate.
And a relief groove in the form of a long groove that communicates with the oil passage of the crankshaft.

In this case, the relief groove provided in the cover member is opened to the oil reservoir in the closed container, and the open portion of the relief groove is closed by the reed valve.

Further, a plurality of fixed legs are formed on the bearing plate so as to project toward an inner peripheral side surface in the closed container, and the bearing plate is formed in the same direction as the projecting direction of one of the fixed legs. The notch for the oil discharge port and the bolt hole to be machined are arranged.

Further, the two bolt holes corresponding to the bolt holes of the bearing plate formed in the thrust plate and the cover member respectively, and the first hole or relief communicating with the oil discharge hole and the oil passage of the crankshaft. The grooves are arranged in a straight line.

Furthermore, the tip of the vane of the rotor engaging with the vane slot provided on the inner peripheral side wall surface of the cylinder chamber of the bearing plate is formed in a circular shape having a diameter substantially the same as the width dimension of the vane slot. In addition, the root side is narrower than the width dimension of the vane slot.

Further, the oil pump mechanism of the present invention includes a bearing plate fixed to the inner peripheral side surface on the inner bottom surface side in the closed container and having a bearing hole for supporting the lower end portion of the crankshaft. A cylinder chamber formed in the bearing plate, a rotor formed of a trochoid gear housed in the cylinder chamber and revolvably revolving around the lower end eccentric shaft of the crankshaft, and slidably opposed to the rotor. The thrust plate and the cover member that covers the cylinder chamber together with the thrust plate are assembled by bolts and integrated, and the thrust plate and the cover member are respectively formed by press punching material of a steel plate. The plate has a first hole communicating with the oil passage of the crankshaft and an oil hole formed on an inner peripheral side wall surface of the cylinder chamber. While a second and third holes respectively communicating with the inlet cut-out portion and the oil outlet notches, the cover member includes a first of said thrust plate 2
The oil suction hole communicating with the oil suction hole, the third oil discharging hole of the thrust plate, and the relief groove communicating with the oil passage of the crankshaft are provided.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 24.
FIG. 1 shows the overall structure of a scroll compressor according to the present invention. In the figure, reference numeral 1 denotes a hermetically sealed container, and the hermetically sealed container 1 includes a cylindrical body portion 2 and upper and lower end portions 2a and 2b of the body portion 2, respectively. It is formed of end caps 3 and 4 to be crowned.

At the bottom of the closed container 1, the electric element 1
0 is accommodated, the scroll compression element 20 is accommodated in the upper portion of the electric element 10, and the electric element 10 is rotatably attached to the stator 11 and the central shaft portion of the stator 11. The rotor 12 is inserted and fitted, and the crankshaft 13 for driving the scroll compression element 20 is fixed to the central shaft portion of the rotor 12 in a press-fit state.

The scroll compression element 20 is swingably supported by an upper fixed scroll 21 fixed in the closed container 1 and a main frame 5 fixed in the closed container 1 via an Oldham ring 6. And the fixed scroll 21.
Spiral wrap 23 formed on the lower surface of the end plate 22 of
Further, the compression chamber P is formed by meshing the spiral wraps 33 formed on the upper surface of the end plate 32 of the orbiting scroll 31 with each other.

Reference numeral 7 in the drawing denotes a suction pipe for the refrigerant gas G provided on the outer side of the closed container 1. The suction pipe 7 faces the low pressure space 1A side in the closed container 1 and the low pressure space 1A.
The refrigerant gas G supplied to the scroll compression element 2 is
0 is sucked into the initial compression chamber P1 side of the compression chamber P, and is compressed toward the latter compression chamber P2 side of the central axis portion of the scroll compression element 20. The refrigerant gas G compressed in is discharged from the discharge port 24 communicating with the latter compression chamber P2 opened in the end plate 22 of the fixed scroll 21 to the high pressure space 1B side in the upper part of the closed container 1, and the closed container The discharge pipe 8 provided in the upper end cap 3 of No. 1 discharges to an external refrigerant unit circuit (not shown).

Further, the inner bottom surface of the closed container 1 serves as an oil reservoir 9 for the lubricating oil O, and the lubricating oil O stored in the oil reservoir 9 is used as the electric element 1.
An eccentric shaft, which is the upper end of the crankshaft 13 through an oil passage 14 penetrating the inside of the crankshaft 13, is raised by an oil pump mechanism 50, which will be described later, provided in conjunction with the lower end 13a of the crankshaft 13. It is adapted to discharge to the portion 13b side.

As shown in FIGS. 2 and 3, a bush portion 34 is integrally formed on the lower surface central shaft portion of the end plate 32 of the orbiting scroll 31 which is the scroll compression element 20. Fitting hole 3 formed in 34
By fitting the upper end eccentric shaft portion 13b of the crank shaft 13 to the drive shaft 5, the orbiting scroll 31 is driven, and the fitting hole 35 and the upper end eccentric shaft portion of the crank shaft 13 are fitted. An oil introduction port is formed by forming a gap formed between the stepped space portion 13b and the stepped space portion 13b.

That is, in the oil inlet 36, the lubricating oil O stored in the oil reservoir 9 passes through the oil passage 14 in the oil pump mechanism 50, which will be described later, and is eccentric as the upper end of the crankshaft 13. The lubricating oil O is introduced by rising so as to be discharged to the shaft portion 13b side.
The refrigerant gas G is supplied from an oil groove (not shown) formed in the thrust surface of the end plate 32 of the orbiting scroll 31 and the main frame 5 to the initial compression chamber P1 in the compression chamber P of the scroll compression element 20 together with the refrigerant gas G. It is designed to work.

The end plate 32 of the orbiting scroll 31 is also provided.
Two oil injection communication passages 37, 38, which form an oil injection mechanism, are formed in the inside of the stepped space 36A of the oil introduction port 36 on the side of the central shaft to communicate with the side of the compression chamber P. The respective oil injection communication passages 37, 38 are the ends of the spiral wraps 23, 33 formed by forming the opening ends 37a, 38a on the compression chamber P side in the fixed scroll 21 and the orbiting scroll 31, respectively. The opening is made in the vicinity of the portions 23a and 33a to face the initial compression chamber P1 in the compression chamber P.

Further, a baffle plate 41 is provided on the upper back surface side of the scroll compression element 20 in the closed container 1, and the outer peripheral edge 41a of the baffle plate 41 is formed in a cylindrical upright shape, and , The upper fixed scroll 2 of the scroll compression element 20 at the center of the inner bottom surface portion 42 thereof.
1. Cylindrical fitting opening 4 fitted into the boss portion 25 provided in
3 is formed of a press-formed steel plate having a double-cylindrical shape, and the inner bottom surface portion 42 has a saucer-like shape serving as an oil reservoir curved downward in an arc shape, and a central portion thereof. A cylindrical fitting opening 43 is formed upright, and a flange 44 serving as a stopper is formed on the inner peripheral edge of the upper end of the fitting opening 43, while the center of the inner bottom surface 42 is formed. An oil return passage 45 that communicates with the low-pressure space 1A side in the closed container 1 is provided near the portion side.

The baffle plate 41 has an outer peripheral edge 4
1a is fixed by welding together with the outer peripheral edge 3a of the end cap 3 to be capped on the upper end 2a of the body 2 of the closed container 1, and as shown in FIG. Is fitted in a non-contact state via a radial seal ring 46 having a U-shaped cross section, which is assembled to the outer peripheral side surface of a boss portion 25 projectingly formed on the upper rear side central shaft portion of the end plate 22 of the fixed scroll 21 via a seal groove 26. The flange portion 44 serving as the stopper is engageable with the upper surface of the boss portion 25 formed to project on the end plate 22 of the fixed scroll 21.

That is, in the baffle plate 41, the space 47 above the fitting port portion 43 formed between the baffle plate 41 and the end cap 3 is compressed late by the high pressure side through the discharge port 24 provided in the fixed scroll 21. The airtight container 1 is partitioned so as to form a discharge muffler portion communicating with the chamber P2, and a high-pressure refrigerant gas compressed in the compression chamber P is passed through the muffler space 47 forming the high-pressure space 1B. G is discharged from the discharge pipe 8, and the inner bottom surface portion 42 thereof stores the lubricating oil O that is sprayed on the inner surface of the end cap 3 together with the refrigerant gas G and drops separately. The oil O for use from the oil return passage 45 in the low-pressure space 1A in the closed container 1
It has an oil separator function of returning to the oil reservoir 9 on the inner bottom surface of the closed container 1 by flowing out to the side.

The oil pump mechanism 50 is shown in FIG.
As shown in FIG. 12 as the first embodiment, a bearing plate 51 made of an aluminum die-cast product or the like fixed to the inner bottom surface side of the closed container 1 and a lower end surface side of the bearing plate 51 are formed. And a bearing hole 52 formed through the central shaft portion, and the bearing hole 52.
And a cylinder chamber 53 facing the eccentric shaft portion 15 on the lower end portion 13a side of the crankshaft 13 pivotally supported by the cylinder chamber 5
Vane slots 5 formed on the inner wall surface of No. 3 respectively
3A, a cutout portion 53B for an oil suction port, a cutout portion 53C for an oil discharge port, and a cylinder 53 which are incorporated in the cylinder 53 so as to swing by the rotation of the lower eccentric shaft portion 15 of the crankshaft 13 and which are formed on the outer peripheral surface thereof. A rotor 54 integrally formed with a vane 55 that engages with the vane slot 53A.
A thrust plate 56 that supports the rotor 54 in a thrustable manner, and a cover member 57 that covers the cylinder chamber 53 in which the rotor 54 is incorporated via the thrust plate 56.

The thrust plate 56 is formed on the inner wall surface of the cylinder chamber 53 and the first oil hole 56A communicating with the oil passage 14 opened on the side of the eccentric shaft portion 15 of the crankshaft 13. It is made of a stamped material such as carbon steel (valve steel) provided with a second oil suction hole 56B and a third oil discharge hole 56C which communicate with the oil suction port cutout 53B and the oil discharge port cutout 53C. The cover member 57 has a long groove-shaped relief groove 57A communicating with the third oil discharge hole 56C of the thrust plate 56 and the oil passage 14 of the crankshaft 13, and an inner wall surface of the cylinder chamber 53. The second oil suction hole 56 of the thrust plate 56 which communicates with the notch 53B for the oil suction port formed in
The relief groove 57A is opened to the oil reservoir 9 side and the open portion is closed by a reed valve 58, and each of these is formed of a pressed steel plate having an oil suction hole 57B communicating with B. Thrust plate 5
6, the cover member 57 and the reed valve 58 are bolt holes 51 formed on the lower end surface side of the bearing plate 51.
The bolts 59, 59 screwed onto the A, 51A are fastened and fixed to each other so as to be integrally assembled.

In the bearing plate 51, a plurality of (three in the illustrated embodiment) fixed legs 51B are formed so as to project toward the inner peripheral side surface of the closed container 1, and the direction in which the one fixed leg extends. The bearing plate 51 is formed in the thrust plate 56 and the cover member 57, respectively, while the oil discharge port cutout 53C and the bolt holes 51A, 51A are formed in the bearing plate 51 in the same direction as the above. Bolt holes 51A, 51
Two bolt holes 56D, 56D and 57 corresponding to A
C, 57C and the first hole 56A communicating with the oil passage 14 of the crankshaft 13 and the oil discharge hole 56C or the relief groove 57A are arranged in a straight line.

FIGS. 13 to 16 show a second embodiment of the oil pump mechanism 50 according to the present invention, in which the relief groove 57A of the cover member 57 is not opened to the oil sump 9 side. By forming the third oil discharge hole 56C of the thrust plate 56 and the oil passage 14 of the crankshaft 13 in a recessed groove shape so as to communicate with each other, a reed valve is not required.

The rotor 54 is made of a synthetic resin molded product, a sintered material, or the like. As shown in FIG. 17, the tip portion 55a of the vane 55 that engages with the vane slot 53A of the cylinder chamber 53 has the vane 55a. The vane slot 5 is formed in a circular shape having a diameter substantially the same as the width dimension of the slot 53A, and the root portion 55b side thereof is formed on the vane slot 5 side.
The width dimension of the base portion 55b is narrower than the width dimension of 3A, and the root portion 55b is formed in the R shape.
8 (A) (B) (C) (D), the so-called vane collapse (swing) is reduced in the oil suction / discharge stroke during the operation shown in FIG. The portion 55b is the vane slot 53.
By not interfering with A and smoothing the swing of the vane 55, it is possible to prevent the oil pump efficiency from decreasing.

20 to 24 show a third embodiment of an oil pump mechanism 50 according to the present invention, in which the rotor 54 is provided with a first external gear 54A and the first external gear 54A. 54A is composed of a trochoid gear which is a combination with a second internal gear 54B meshed with the gear 54A.

That is, according to the present invention, by adopting the above configuration, the compression chamber P of the scroll compression element 20 driven by the crankshaft 13 of the electric element 10 housed in the upper part of the closed container 1 is fixed. The scroll 21 and the orbiting scroll 31 are formed by meshing the spiral wraps 23 and 33 provided on the end plates 22 and 32 of each other,
In the central shaft portion of the lower surface of the end plate 32 of the orbiting scroll 31,
Fitting hole 35 into which the upper end portion 13b of the crankshaft 13 is fitted
And a fitting portion 35 of the bush portion 34 and the upper end portion 13a of the crankshaft 13 are provided.
A space formed between the oil and oil is used as an oil inlet port 36, and the lubricating oil O stored in the oil reservoir 9 on the inner bottom surface of the closed container 1 that rises from the oil inlet port 36 by the oil pump mechanism 50 is cranked. The oil is supplied into the compression chamber P via the oil passage 14 provided in the shaft 13, while the oil injection communication passages 37, 38 communicating with the compression chamber P from the oil introduction port 36 are provided in the end plate 32 of the orbiting scroll 31. In the vicinity of the end portions 23a, 33a of the spiral wraps 23, 33 of the initial compression chamber P1 formed in the fixed scroll 21 and the orbiting scroll 31, the opening ends 37a, 38a of the oil injection communication passages 37, 38 on the compression chamber side are formed. To open.

For this reason, the lubricating oil O rising in the oil pump mechanism 20 is forcibly supplied from the oil inlet 36 into the initial compression chamber P1 of the compression chamber P through the oil injection communication passages 37 and 38. And by this,
The sealing property of the compression chamber P is improved, and the leak amount of the refrigerant gas G during the compression is reduced.

Further, since the oil inlet 36 facing the opening ends 37a, 38a of the oil injection communication passages 37, 38 is formed in the stepped space 36A, the inside of the oil inlet 36 is operated at a high speed operation. Since the centrifugal force of the lubricating oil O introduced into the engine is increased and the passage resistance is increased, the amount of inflow into the oil injection communication passages 37 and 38 is reduced, and as a result, the frequency is 60 Hz or higher in the high speed rotation range. Even if the amount of oil injection in (1) is greatly reduced and the circulation amount of the refrigerant gas is increased, the oil level is prevented from lowering due to the sudden decrease in the lubricating oil stored in the oil reservoir (9).

Further, a baffle plate 41 is provided on the upper back side of the scroll compression element 20, and the baffle plate 41 is provided.
The space 47 formed between the upper surface of the closed container 1 and the inner surface of the end cap 3 is used as a discharge muffler portion that communicates with the late compression chamber P2 that is the high pressure side of the compression chamber P. Through which the high-pressure refrigerant gas G compressed in the compression chamber P is discharged to the outside of the closed container 1, and the baffle plate 41 forming the muffler space 47 of the discharge muffler portion is connected to the low-pressure space inside the closed container 1. An oil return passage 45 communicating with the 1A side is provided.

For this reason, the lubricating oil O, which is sprayed on the inner surface of the end cap 3 together with the refrigerant gas G and is separated and dropped, is stored in the inner bottom surface portion 42 of the baffle plate 41, and is sealed from the oil return passage 44. It becomes possible to flow out to the low-pressure space 1A side in 1 and return to the oil sump 9 at the inner bottom surface portion of the closed container 1, whereby the refrigerant gas G
Even if the circulation amount of the oil is increased, the oil level is prevented from lowering due to the sudden decrease of the lubricating oil O stored in the oil sump 9.

Furthermore, the outer peripheral edge 41a of the baffle plate 41 is fixed to the closed container 1 side, and is supported by the upper fixed scroll 21 of the scroll compression element 20 in a non-contact state via a radial seal ring 46. Therefore, the radial seal ring 46 is always pressed against the low-pressure space side, and it becomes possible to improve the sealing performance, and the radial seal ring 46 is prevented from sagging or getting settled.

The outer peripheral edge 41a of the baffle plate 41 is formed to stand up in a cylindrical shape, and the baffle plate 41 is fitted to the boss portion 25 provided on the upper fixed scroll 21 at the central portion thereof via a radial seal ring 46. The boss portion 25 is made of a press-formed steel plate having a double-cylindrical shape in which a cylindrical fitting opening 43 to be fitted is formed upright, and is provided on the upper fixed scroll 21 at the inner peripheral edge of the upper end of the fitting opening 43.
Since the flange portion 44 serving as a stopper that can be locked is formed on the upper surface, it is possible to reduce the weight, and moreover, it is possible to perform press drawing only, which makes machining unnecessary, and
Even if the inner bottom surface portion 42 of the baffle plate 41 bends due to the differential pressure, the cylindrical fitting port portion 43 moves slightly in the thrust direction, but there is almost no dimensional change, and this has little effect on the sealing performance.

Moreover, since the inner bottom surface portion 42 of the baffle plate 41 has a saucer-like shape which serves as an oil reservoir curved downward in an arc shape, the discharge volume of the muffler space 47 can be increased. Therefore, the pressure pulsation can be reduced.

On the other hand, in the oil pump mechanism 50, a cylinder chamber 53 is formed in a bearing plate 51 fixed to the inner peripheral side surface on the inner bottom surface side in the closed container 1, and the crankshaft of the electric element 10 is formed in the cylinder chamber 53. In particular, since the rotor 54 driven by 13 is assembled by bolts 59 through a thrust plate 56 and a cover member 57, which are respectively formed by press punching material of steel plate, the cover member 57 is manufactured. The cost can be reduced and the weight can be reduced.

Further, since the relief groove 57A provided in the cover member 57 is opened to the oil reservoir in the closed container 1 and the open portion of the relief groove 57A is closed by the reed valve 58, the structure of the relief mechanism is constituted. Since the parts can be simplified and the relief groove 57A has a long groove shape, oil can be smoothly reliefed by opening the reed valve 58, and the input can be sufficiently reduced with a small lift. .

Further, a plurality of fixed legs 51B are formed on the bearing plate 51 so as to project toward the inner peripheral side surface in the hermetically sealed container 1, and the bearing plate is formed in the same direction as the projecting direction of one of the fixed legs 51B. Since the bolt hole 51A machined into 51 and the oil discharge port notch 53C on the inner peripheral side wall surface of the cylinder chamber 53 are arranged, the degree of freedom in designing the length of the reed valve is increased.

Furthermore, two bolt holes 56D, 56D and 57C, 57C corresponding to the bolt holes 51A, 51A of the bearing plate 51 formed in the thrust plate 56 and the cover member 57, and the oil discharge hole 56C, respectively. Since the first hole 56A or the relief groove 57A communicating with the oil passage 14 of the crankshaft 13 is arranged in a straight line, the reed valve 58 can be easily covered.

Further, the tip portion 55a of the vane 55 of the rotor 54 which engages with the vane slot 53A provided on the inner peripheral side wall surface of the cylinder chamber 53 of the bearing plate 51 has the same diameter as the width dimension of the vane slot 53A. Since it has a shape of a circular shape and its root portion 55b side is narrower than the width dimension of the vane slot 53A, it does not interfere with each other as in the conventional case, and thereby,
It becomes possible to swing the vane 55 freely,
The wear resistance is improved, the oil pump efficiency is improved, and a synthetic resin molded product or a sintered material is used as the rotor 54 and the vane 55, so that a free shape can be selected.

Further, the rotor 5 of the oil pump mechanism 50
By adopting trochoid gears 54A and 54B as No. 4, oil can be sucked in and discharged more efficiently.

[0048]

As is apparent from the above description, according to the present invention, the scroll compression element driven by the crankshaft of the electric element is provided in the upper part of the closed container having the inner bottom surface as the oil reservoir of the lubricating oil. An oil pump mechanism, which is housed and supplied with the lubricating oil raised from the oil reservoir to the compression chamber of the scroll compression element, is provided with a bearing plate, a cylinder chamber formed in the bearing plate, and a rotor provided in the cylinder chamber. And a thrust plate slidably opposed to the rotor, and a cover member that covers the cylinder chamber together with the thrust plate, are integrally formed by bolts, and the thrust plate and the cover member are made of a steel plate. Since it is formed by each press stamping material, the manufacturing cost of the cover member is particularly low and the cost is low. It is possible to achieve a down, it is possible to reduce the weight.

In the second aspect, the relief groove provided in the cover member is opened to the oil reservoir in the closed container,
Since the open portion of the relief groove is closed by the reed valve, the components of the relief mechanism can be simplified, and the relief groove has a long groove shape, so that the reed valve can be opened. As a result, oil can be smoothly relieved and the input can be sufficiently reduced with a small lift.

Further, according to a third aspect of the present invention, a plurality of fixed legs are formed on the bearing plate so as to project toward the peripheral side surface in the hermetic container, and one of the fixed legs extends in the same direction as the projecting direction of the bearing plate. Since the bolt hole to be machined and the notch for the oil discharge port on the side wall surface of the cylinder chamber inner wall are arranged, the degree of freedom in designing the length of the reed valve can be increased.

Furthermore, in claim 4, two bolt holes corresponding to the bolt holes of the bearing plate formed in the thrust plate and the cover member respectively, and a hole communicating with the oil discharge hole and the oil passage of the crankshaft. Alternatively, since the relief groove and the relief groove are arranged in a straight line, the reed valve can be easily covered.

According to the present invention, the tip of the vane of the rotor, which engages with the vane slot provided on the inner peripheral wall surface of the cylinder chamber of the bearing plate, has a circular shape whose diameter is substantially the same as the width dimension of the vane slot. Since it has a shape in which the root side is narrower than the width dimension of the vane slot, it does not interfere with each other as in the past, which allows the vanes to freely swing and wear resistance. Performance is improved, the oil pump efficiency is improved, and the shape of the rotor and the vanes can be freely selected by using synthetic resin molded products or sintered materials.

Furthermore, in the sixth aspect, by adopting a trochoid gear as the rotor of the oil pump mechanism, it is possible to more efficiently suck and discharge the oil.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a scroll compressor according to the present invention.

FIG. 2 is a plan view of an orbiting scroll of the scroll compression element.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is an enlarged cross-sectional view of portion B of FIG.

FIG. 5 is a sectional view showing a first embodiment of the oil pump mechanism of the same.

FIG. 6 is a bottom view of the oil pump mechanism.

FIG. 7 is an exploded view of the oil pump mechanism.

FIG. 8 is a bottom view of a bearing plate that also forms the oil pump mechanism.

FIG. 9 is a bottom view of a rotor that also forms an oil pump mechanism.

FIG. 10 is a bottom view of a thrust plate that also forms an oil pump mechanism.

FIG. 11 is a bottom view of a cover member that also forms an oil pump mechanism.

FIG. 12 is a bottom view of a reed valve that also forms an oil pump mechanism.

FIG. 13 is an exploded view showing a second embodiment of the oil pump mechanism of the same.

FIG. 14 is a bottom view of a rotor which also forms the second embodiment of the oil pump mechanism.

FIG. 15 is a bottom view of a thrust plate that also forms the second embodiment of the oil pump mechanism.

FIG. 16 is a bottom view of the cover member that also forms the second embodiment of the oil pump mechanism.

FIG. 17 is an explanatory view showing a vane form of a rotor of the oil pump mechanism.

18 (A), (B), (C), and (D) of FIG. 18 are explanatory views showing the intake / exhaust stroke of the oil pump mechanism.

FIG. 19 is an explanatory view showing an enlarged operation of the rotor vanes with respect to the vane slots of the cylinder in the portion C of FIG. 18D.

FIG. 20 is an exploded view showing a third embodiment of the oil pump mechanism of the same.

FIG. 21 is a bottom view of the thrust plate that also forms the third embodiment of the oil pump mechanism.

FIG. 22 is a bottom view of the first trochoid gear of the rotor that also forms the third embodiment of the oil pump mechanism.

FIG. 23 is a bottom view of a second trochoid gear that meshes with the first trochoid gear of the rotor that also forms the third embodiment of the oil pump mechanism.

FIG. 24 is a bottom view of the cover member that also forms the third embodiment of the oil pump mechanism.

FIG. 25 is an enlarged sectional view showing an example of a conventional oil pump mechanism.

FIG. 26 is an explanatory view showing a vane form of the rotor of the conventional oil pump mechanism.

27 (A), (B), (C), and (D) of FIG. 27 are explanatory views showing the intake / exhaust stroke of the conventional oil pump mechanism.

FIG. 28 is an explanatory view showing an enlarged operation of the rotor vane with respect to the conventional vane slot of the cylinder in the portion D of FIG. 27 (D).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airtight container, 9 ... Oil sump, 10 ... Electric element, 13 ... Crank shaft, 14 ... Oil passage, 15 ... Bottom eccentric shaft part, 20 ... Scroll compression Elements: 50 ... Oil pump mechanism, 51 ... Bearing plate, 51A, 51A ... Bolt hole, 51B, 51B, 51B ... Fixed leg, 52 ... Bearing hole, 53 ... Cylinder chamber , 53A ... Vane slot, 53B ... Oil suction port cutout, 53C ... Oil discharge port cutout, 54 ... Rotor, 55 ... Vane, 55a ... Tip part, 55b ... Root portion, 56 ... Thrust plate, 56A ... First oil hole, 56B ... Second oil suction hole, 56C ... Third oil discharge hole, 57 ... Cover Material, 57A ... Relief groove, 57B ... Oil suction hole, 58 ... Reed valve, 59, 59 ... Bolt, P ... Compression chamber, O ... Lubricating oil.

Claims (6)

[Claims] 1. A scroll compression element composed of a fixed scroll and an orbiting scroll driven by a crankshaft of an electric element is housed in an upper portion of a closed container whose inner bottom surface is an oil reservoir for lubricating oil. The refrigerant gas sucked in the compression chamber of the scroll compression element is compressed, and the lubricating oil that rises from the oil reservoir by the oil pump mechanism is passed through the compression chamber along the axial direction in the crankshaft. In a scroll compressor supplied through an oil passage, the oil pump mechanism is fixed to an inner peripheral side surface on the inner bottom surface side in the closed container, and a lower end portion of the crankshaft is pivotally supported by a bearing hole thereof. A bearing plate, a cylinder chamber formed in the bearing plate, and an eccentric shaft portion of the lower end of the crankshaft housed in the cylinder chamber. A rotor that revolves freely, a thrust plate that slidably contacts the rotor, and a cover member that covers the cylinder chamber together with the thrust plate are integrated by bolts, and these thrust plates and The cover member and the thrust plate are formed by press punching of a steel plate, respectively, and the thrust plate has a first hole communicating with an oil passage of the crankshaft and an oil suction hole formed on an inner peripheral wall surface of the cylinder chamber. The cover member includes second and third holes that communicate with the mouth cutout and the oil discharge cutout, respectively, while the cover member communicates with the second oil suction hole of the thrust plate. A hole, a third oil discharge hole of the thrust plate, and an elongated groove-shaped relief groove communicating with the oil passage of the crankshaft. And a scroll compressor. 2. A relief groove provided in the cover member is opened to an oil reservoir in a closed container, and an open portion of the relief groove is closed by a reed valve.
Scroll compressor described in. 3. A bearing plate, wherein a plurality of fixed legs are formed so as to project toward an inner peripheral side surface in a hermetic container, and one of the fixed legs is processed in the bearing plate in the same direction as the projecting direction. The scroll compressor according to claim 1, wherein a notch for an oil discharge port and a bolt hole are arranged. 4. The two bolt holes corresponding to the bolt holes of the bearing plate formed in the thrust plate and the cover member respectively, and the first hole or the relief groove communicating with the oil discharge hole and the oil passage of the crankshaft. 4. The scroll compressor according to claim 1, wherein the scroll compressors are arranged in a straight line. 5. A tip portion of a vane of a rotor that engages with a vane slot provided on an inner peripheral side wall surface of a cylinder chamber of a bearing plate is formed in a circular shape having a diameter substantially the same as a width dimension of the vane slot, The scroll compressor according to claim 1, 2, 3, or 4, wherein the root side is narrower than the width dimension of the vane slot. 6. A scroll compression element composed of a fixed scroll and an orbiting scroll driven by a crankshaft of an electric element is housed in an upper portion of a closed container having an inner bottom surface as an oil reservoir for lubricating oil, and The refrigerant gas sucked in the compression chamber of the scroll compression element is compressed, and the lubricating oil that rises from the oil reservoir by the oil pump mechanism is passed through the compression chamber along the axial direction in the crankshaft. In a scroll compressor supplied through an oil passage, the oil pump mechanism is fixed to an inner peripheral side surface on the inner bottom surface side in the closed container, and a lower end portion of the crankshaft is pivotally supported by a bearing hole thereof. A bearing plate, a cylinder chamber formed in the bearing plate, and an eccentric shaft portion of the lower end of the crankshaft housed in the cylinder chamber. A rotor comprising a trochoid gear revolves swingably,
A thrust plate slidably opposed to the rotor and a cover member that covers the cylinder chamber together with the thrust plate are integrated by bolts, and the thrust plate and the cover member are stamped from a steel plate. The thrust plate includes a first hole communicating with an oil passage of the crankshaft, a notch for an oil suction port and an oil discharge port formed on an inner peripheral side wall surface of the cylinder chamber. While having a second hole and a third hole that communicate with the cutout portion, the cover member has an oil suction hole that communicates with the second oil suction hole of the thrust plate and a third hole of the thrust plate. And a relief groove communicating with the oil passage of the crankshaft are provided in the scroll compressor.