JPH0932745A - Open scroll compressor - Google Patents

Abstract

(57) [Abstract] [Object] The present invention provides an intermediate partition plate in a compressor housing to form a suction chamber, which facilitates separation of a refrigerant shunt and lubricating oil to reduce suction resistance and pressure loss. It is intended to improve the performance by reducing the friction coefficient and improve the reliability and the assembling property by reducing the frictional resistance of the sliding parts. [Structure] An intermediate partition plate 54 having a plurality of suction passages 23 and a main bearing 15 and also having a rotation restraining function is provided inside a compressor housing 3 together with main components such as a fixed scroll 1, an orbiting scroll 2 and a drive shaft 9. , Discharge chamber 1
By forming 1, the working chamber 12 and the suction chamber 22, it is possible to promptly separate the lubricating oil, smoothly divide the refrigerant, and improve the assembling property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open type scroll compressor suitable for air-conditioning and refrigerating compressors and the like, and more particularly to improving the lubrication mechanism of sliding parts, improving the efficiency of refrigerant passages and assembling. This is related to facilitation of workability.

[0002]

2. Description of the Related Art Generally, as an open type scroll compressor of this type, a scroll type compressor for an automobile air conditioner disclosed in Japanese Patent Publication No. 58-19875 is taken as an example, and the basic structure thereof will be described with reference to FIGS. The physical configuration and the like will be described. FIG. 5 shows the structure of the main body of the open type scroll compressor, and discloses an example in which a so-called ball joint is used, which serves both as a method of supporting the thrust force applied to the orbiting end plate and as a rotation restraint component. The configuration in which the driving force from the engine is transmitted to the compressor body 30 via the belt and the electromagnetic clutch 35 is simplified as a known fact.

As a main component of the compressor body 30, the compressor housing 3 forming the outer shell of the compressor body 30 is divided into a cup-shaped case 31 and a front end plate 32. The one end opening 33 is closed by the front end plate 32.
Inside the compressor housing 3, a fixed scroll 1 formed by forming a spiral first wrap 1b standing upright on a fixed mirror plate 1a and a spiral second wrap 2b standing upright on a revolving mirror plate 2a are formed. , Orbiting scroll 2 in which both laps 1b and 2b are inwardly meshed with fixed scroll 1, orbiting end plate 2a and front end plate 32
A ring-shaped orbiting scroll side race 41 which is disposed in parallel with the orbiting end plate 2a and which also serves as a thrust bearing component and a rotation restraint component, and an orbiting scroll side ring 42,
It is composed of a ring-shaped plate-side race 43, a plate-side ring 44, a plurality of ball elements 46, and a drive mechanism for transmitting the orbiting motion to the orbiting scroll 2. The fixed scroll 1 is fastened with a bolt 19 between a fastening leg 1d provided on the rear surface of the fixed end plate 1a opposite to the first wrap 1b and a cup-shaped case 31. Fixed end plate 1a
O-ring 1 inserted in the seal groove 1f of the outer peripheral portion 1e of
8 is attached between the cup-shaped case 31 and the discharge chamber 11 on the fastening leg 1d side and the working chamber 12 on the first lap 1b side.
It is divided into Between the orbiting end plate 2a and the front end plate 32, the orbiting scroll side ring 42 is attached to the orbiting end plate 2a so as to cover the ring-shaped orbiting scroll side race 41, and covers the ring-shaped plate side race 43. And the orbiting scroll side ring 42
A plate-side ring 44 is attached to the front end plate 32 so that a small gap is formed between the ring and the front-end plate 32. Orbiting scroll side ring 42 and plate side ring 4
4 is provided with holes 45 each forming a plurality of pockets having the same diameter in the axial direction, and a plurality of ball elements 46 are provided in the holes 45.
Is always sandwiched between the fixed scroll 1 and the fixed scroll 1 while restraining its rotation, and has a function as a thrust bearing component of the orbiting scroll 2. The drive shaft 9 is rotatably supported via a main bearing 15 that is press-fitted and attached to the front end plate 32, and is rotatably supported via the main bearing 15 that is attached to the front end plate 32. The main shaft portion 9a extends to the outside of the compressor housing 3 through the shaft sealing device 17 and the sub bearing 16 fitted in the tubular member 34 attached to the front end plate 32. . The drive pin 9b at the end of the drive shaft 9 on the side of the orbiting scroll 2 is connected to the orbiting bush 8 having a function as a drive transmission mechanism. Slewing bearing 7 provided on the formed cylindrical boss portion 2c
Has been inserted. With this configuration, the orbiting scroll 2
Can be provided with a drive mechanism for orbiting the fixed scroll 1. Working chamber 12 of cup-shaped case 31
A suction port 13 for sucking the refrigerant as a working fluid is provided on the side of the first wrap 1b or the second wrap 2b, and a discharge port 14 for discharging the refrigerant is provided on the discharge chamber 11 side. .

Further, the orbiting bush 8 between the orbiting scroll 2 and the main bearing 15 has a first counterweight 8a for canceling the dynamic imbalance of the orbiting scroll 2 and the orbiting bush 8 due to the orbital and rotational movements of the drive transmission components. Attach the main bearing 15 and front end plate 32
A second counterweight 9c for generating a centrifugal force in the same direction as the first counterweight 8a is provided on the drive shaft 9 between them.

The orbiting scroll 2 is a fixed scroll 1.
On the other hand, when the swirling motion is started and the compression stroke is started, the refrigerant is taken into the working chamber 12 in the compressor housing 3 through the suction port 13. Then, the fixed end plate 1a and its spiral first wrap 1b, and the swivel end plate 2a and its spiral second wrap 2b are fed into a fluid pocket 10 in a closed space, and the wraps 1b and 2b It is compressed from the outer periphery toward the center. The compressed refrigerant gas is discharged into the discharge chamber 11 through the discharge gas hole 1c at the center of the fixed mirror plate 1a, and further discharged from the discharge port 14 to the outside. A discharge valve 36 and a discharge valve retainer 37 are supported by a discharge valve fixing bolt 38 on the discharge chamber 11 side of the discharge gas hole 1c to prevent the reverse flow of the refrigerant.

[0006]

In the conventional open type scroll compressor shown in FIGS. 5 to 6, due to the orbiting motion of the orbiting scroll, the refrigerant together with the lubricating oil flows from the suction port of the cup-shaped case into the compressor housing. And is sent to the fluid pocket in the closed space that is closed between the fixed scroll and the orbiting scroll wraps, compressed from the outermost periphery of both wraps toward the center, and passes through the discharge chamber through the discharge gas holes. , Is discharged from the discharge port to the outside. During this compression stroke, first, when the refrigerant is taken into the compressor housing through the suction port together with the lubricating oil,
Since the suction port is provided in the vicinity of the first wrap of the fixed scroll or the second wrap of the orbiting scroll, there is no choice but to pass through a very narrow suction passage. As a result, the pressure loss at the time of suction increases and the refrigerant taken into the two fluid pockets is not always in a uniform pressure state.As a result, torque fluctuation is large, compression efficiency is reduced, and performance is greatly affected. Will be affected. In addition, since the lubricating oil does not have a suction space that is large enough to separate it from the refrigerant, most of it is immediately trapped in the compressor, and most of it is immediately trapped in the fluid pocket closed by both wraps. It becomes difficult to supply sufficient lubricating oil to sliding parts such as. As a result, the sliding friction increases, the mechanical efficiency decreases, the performance deteriorates, and abnormal wear of the sliding portion may occur, resulting in the problem of breakage.

Looking at the structure around the drive shaft from the viewpoint of assembly work, when the main bearing is press-fitted and fixed to the front end plate, at the same time, the drive shaft having the second counterweight attached is also inserted into the main bearing. Since it must be attached, the drive shaft is likely to be misaligned or tilted.
And once the misalignment or inclination occurs, the structure cannot be corrected. Further, it is structurally impossible to remove the second counterweight once assembled.

The object of the present invention was made in view of the problems in the conventional open type scroll compressor shown in FIG. 5, and it is rotatably supported by an intermediate partition plate having a suction port via a main bearing. Attached drive shaft, the discharge chamber is formed by the rear housing equipped with the fixed end plate and discharge port,
By forming the working chamber by the rear housing, the fixed end plate and the intermediate partition plate, and by forming the suction chamber by the front housing equipped with the suction port and the intermediate partition plate, performance deterioration due to suction pressure loss and sliding friction of sliding parts An object of the present invention is to provide an open-type scroll compressor that solves problems such as increase and abnormal wear, and work problems such as assembly in which mounting errors are not allowed.

[0009]

To achieve the object, an open type scroll compressor according to the present invention includes a fixed end plate and a fixed end plate inside a compressor housing composed of a front housing and a rear housing to which an intermediate partition plate is attached. A fixed scroll having a spiral first wrap standing upright on this end plate, a swivel end plate and a spiral second wrap standing upright on this end plate, and meshed with the fixed scroll with both wraps inside. And the orbiting scroll, the orbiting mechanism part formed on the backside of the orbiting end plate opposite to the spiral second wrap of the orbiting scroll, and restraining the rotation of the orbiting scroll to cause only the orbiting motion. A drive shaft, which is rotatably supported by a main bearing on the intermediate partition plate having a rotation restraint component and a plurality of suction passages, and the drive shaft. A drive transmission component for transmitting the drive force from the wrapping mechanism to the orbiting mechanism portion, and while forming a fluid pocket closed between the laps by the orbiting motion of the orbiting scroll, from the outer periphery of the both wraps toward the center. In an open-type scroll compressor that performs a compression action, a discharge chamber is formed by the fixed end plate and the rear housing having a discharge port, and a working chamber is formed by the rear housing, the fixed end plate and the intermediate partition plate, and suction is performed. The suction chamber is formed by the front housing having a mouth and the intermediate partition plate, and the intermediate partition plate has the function of the rotation restraint component.

Further, as a basic structure of the compressor housing, the present invention includes a cup-shaped rear housing similar to the cup-shaped front housing, and annular projections fitted in respective openings of the front housing and the rear housing. The intermediate partition plates formed on both sides can be tightened together to form a hermetically sealed structure.

It is also possible to provide a rib on the intermediate partition plate in the vicinity of the suction port so as to face the suction port.

As a method of mounting the compressor housing, positioning means is provided in at least one of fitting of the cup-shaped front housing and the intermediate partition plate and fitting of the rear housing and the intermediate partition plate. It is characterized by being provided.

[0013]

In the present invention, by adopting the configuration described above, when the refrigerant is taken into the compressor housing from the suction port together with the lubricating oil, the suction resistance is increased by passing through a very narrow suction passage. In addition, the narrow suction passage eliminates such a problem that the pressure of the refrigerant taken into the two fluid pockets becomes unbalanced, which causes the performance to deteriorate. In addition, the problem of increased frictional resistance or abnormal wear caused by insufficient lubrication oil being supplied to sliding parts such as rotation restraint parts, swivel mechanism parts, or drive transmission parts due to the poor separation of lubricating oil Will be resolved.

Further, in the construction around the drive shaft from the viewpoint of assembly work, when the main bearing is press-fitted and fixed to the front plate, at the same time, the drive shaft to which the second counterweight is attached must also be inserted and attached to the main bearing. Therefore, the structure of the present invention can eliminate the structural problem that the drive shaft is likely to be misaligned or tilted and the second counterweight once assembled thereon cannot be removed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS.

As a component constituting the outer shell of the scroll compressor body 30 of the present invention, the compressor housing 3 comprises a cup-shaped rear housing 51 and a front housing 53 to which an intermediate partition plate 54 is attached. The part 52 is closed by a front housing 53. The basic structure inside the compressor housing 3 will be described. First, a fixed scroll 1 having a fixed end plate 1a and a spiral first wrap 1b standing upright on the fixed end plate 1a, a swirl end plate 2a, and a swirl standing upright on the swivel end plate 2a. It is the same as the conventional one that has a second wrap 2b in the shape of a circle, and the orbiting scroll 2 meshing with the fixed scroll 1 is arranged with both wraps 1b, 2b inside. A swivel bearing 7 is provided as a swivel mechanism portion on a cylindrical boss portion 2c formed on the rear surface of the swirl end plate 1a opposite to the spiral second wrap 2b of the swirl scroll 2. As the rotation restraint parts, a ring-shaped orbiting scroll side race 41 and a orbiting scroll side ring 42 are attached to the orbiting end plate 2a, and a partition plate side race 56 and a partition plate side ring 57 are attached to the intermediate partition plate 54. . A small gap is formed between the orbiting scroll side ring 42 and the partition plate side ring 57, and a plurality of holes 4 in each plate are arranged.
A plurality of ball elements 46 are sandwiched by 5 and restrain the rotation and have a function as a thrust bearing.

Next, the main bearing 15 is attached to the intermediate partition plate 54.
A drive shaft 9 rotatably supported via is attached, and a drive pin 9b at the end of the drive shaft 9 on the side of the orbiting scroll 2 is connected to a orbiting bush 8 having a function as a drive transmission mechanism. The other end is the shaft sealing device 1 mounted in the tubular member 55 of the front housing 53.
7 and the auxiliary bearing 16 to extend to the outside of the compressor housing 3. Further, the swivel bush 8 is inserted into the swivel bearing 7 provided on the cylindrical boss portion 2c on the rear surface of the swivel end plate 2a. With this configuration, the orbiting scroll 2 can include a drive mechanism that causes the fixed scroll 1 to orbit.

Further, the discharge chamber 11 is formed by the rear housing 51 having the fixed end plate 1a and the discharge port 14, and the intermediate partition plate 54 is provided between the front housing 53 inside the compressor housing 3 and the swivel end plate 2a. Thus, the rear housing 51, the fixed end plate 1a, and the intermediate partition plate 54 form the working chamber 12, and the suction port 13
Front housing 53 and intermediate partition plate 5
4, the suction chamber 22 is formed. A rib 54 a is provided in the vicinity of the suction port 13 on the intermediate partition plate 54 so as to face the suction port 13.

Now, when the orbiting scroll 2 starts its orbiting motion with respect to the fixed scroll 1 and the compressor process is started, the refrigerant flows from the suction port 13 into the suction chamber 2 in the compressor housing 3.
Taken in 2. Since the intermediate partition plate 54 is provided with the suction passage 23, the refrigerant flows from the suction chamber 22 into the working chamber 12 through the suction passage 23 in the direction of the arrow shown in FIG. Further, lubricating oil together with the refrigerant passes through the suction passage 23 and enters the working chamber 12 from the suction chamber 22. At this time, the lubricating oil slides on the main bearing 15, the drive shaft 9, the drive pin 9a, the swivel bush 8, the swivel bearing 7, and the like. Pass the moving part. The fluid pocket 10 closed between the wraps 1b and 2b by the orbiting movement of the orbiting scroll 2 performs a compression action while reducing the volume from the outermost peripheral portion of the wraps 1b and 2b toward the center as in the conventional case. Be done. The compressed refrigerant gas is discharged into the discharge chamber 11 through the discharge gas hole 1c at the center of the fixed mirror plate 1a, and further discharged from the discharge chamber 11 to the outside.

With this structure, the refrigerant taken into the suction chamber 22 collides with the rib 54a formed on the intermediate partition plate 54, is split by the impact, and is separated from the lubricating oil. A certain amount of the lubricating oil passes through the plurality of suction passages 23, enters the working chamber 12 together with the refrigerant, and the remaining lubricating oil collects at the bottom of the suction chamber 22. Therefore, the number and shape of the suction passages 23 should be selected in order to supply the lubricating oil to the sliding parts such as the main bearing 15, the drive shaft 9, the drive pin 9a, the swivel bush 8 and the swivel bearing 7 without interruption. Is possible. Further, the refrigerant that has been separated from the lubricating oil quite well and has entered the working chamber 12 is taken into the two fluid pockets 10 and compressed, but similarly, the number and shape of the plurality of suction passages 23 are sufficient. It is also possible to take in the pressure difference in the pocket 10 in a substantially uniform manner. Here, the rib 54a provided on the intermediate partition plate 54 is not particularly required if the refrigerant and the lubricating oil are sufficiently separated, but by forming various shapes on one surface, the refrigerant is divided and the lubricating oil is separated. Can bring great effects.

Regarding the workability of attaching and detaching the second counterweight 9c, first, the intermediate partition plate 5
After attaching the main bearing 15, the drive shaft 9, the second counterweight 9c, etc. to 4, and subassembling them,
By attaching to the front housing 53, it is possible to facilitate the assembling.

In FIGS. 1 and 2, a so-called ball joint mechanism is shown as a rotation restraint component, but as another embodiment, FIG. 3 shows an Oldham joint mechanism. Here, instead of supporting the partition plate side ring 57 and the partition plate side race 56 on the intermediate partition plate 54, the intermediate partition plate 54 has a key groove 27 for fitting the key 26 of the Oldham ring 25, and the thrust is applied. An example in which the bearing 28 is supported is shown. As described above, in any of the forms, the intermediate partition plate 54 can have the function of a rotation restraint component together with other components.

As a further embodiment, the structure of the compressor housing 3 shown in FIGS. 1 and 2 is changed to a cup-shaped front housing 53, a cup-shaped rear housing 51, and a front housing as shown in FIG. The intermediate partition plate 5 having annular projections fitted on the openings 58 and 52 of the rear housing 51 and the rear housing 51 on both sides.
In the example in which 4 and 4 are hermetically sealed together, and by further providing a projection-like claw portion 61 or a pin 62 as a positioning means at the fitting portions thereof, the assembly can be performed with high precision.

[0024]

Since the present invention is constructed as described above, the increase in suction resistance of the refrigerant taken into the compressor housing through the suction port is alleviated, and the pressure loss is minimized. And since it enters the working chamber through a plurality of suction passages formed in the intermediate partition plate, the pressure of the refrigerant when taken into the two fluid pockets closed by both wraps is equalized, Well separated.
Therefore, the performance of the compressor is reduced due to the imbalance of pressure in the two fluid pockets, and the problem of increased frictional resistance of sliding parts or abnormal wear due to the poor separation of lubricating oil is solved to operate the compressor stably. can do.

Further, from the viewpoint of assembly work, the main bearing is first attached to the intermediate partition plate,
The second counterweight can also be retrofitted and reassembled,
It is possible to eliminate the misalignment of the drive shaft and reduce the cost. Next, regarding the assembling of the compressor housing, by providing the positioning means at the fitting portions of the front housing, the rear housing and the intermediate partition plate, the assembling can be performed with high accuracy, and the failure can be remarkably reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor having a ball joint as an embodiment of the present invention.

FIG. 2 is a development view showing the parts and assembly structure of the compressor.

FIG. 3 is a sectional view of a scroll compressor having an Oldham coupling as another embodiment of the present invention.

FIG. 4 is a sectional view of a scroll compressor as another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a scroll compressor having a ball joint as a conventional example.

FIG. 6 is a development view showing the parts and assembly configuration of the conventional machine.

[Explanation of symbols]

 1 Fixed scroll 1a Fixed end plate 1b First spiral wrap of fixed scroll 1c Discharge gas hole 1d Fastening leg 1e Fixed end plate outer peripheral portion 1f Seal groove 2 Orbiting scroll 2a Orbiting end plate 2b Second swirl wrap of orbiting scroll 2c Boss portion 3 Compressor housing 7 Swivel bearing 8 Swiveling bush 8a First counterweight 9 Drive shaft 9a Main shaft portion 9b Drive pin 9c Second counterweight 10 Fluid pocket 11 Discharge chamber 12 Working chamber 13 Suction port 14 Discharge port 15 Main bearing 16 Secondary bearing 17 Shaft sealing device 18 O-ring 19 Bolt 22 Suction chamber 23 Suction passage 25 Oldham ring 26 Key 27 Key groove 28 Thrust bearing 30 Compressor body 31 Cup-shaped case 32 Front end plate 33 One end opening 34 Cylindrical member 35 Electromagnetic clutch 36 Discharge valve 37 Discharge valve retainer fitting 38 Discharge valve fixing bolt 41 Orbiting scroll side race 42 Orbiting scroll side ring 43 Plate side race 44 Plate side ring 45 hole 46 Multiple ball elements 51 Rear housing 52 Rear housing opening 53 Front housing 54 Intermediate Partition Plate 54a Rib 55 Cylindrical Member 56 Partition Plate Side Race 57 Partition Plate Side Ring 58 Front Housing Opening 61 Projecting Claw 62 Projecting Pin

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F04C 29/02 351 F04C 29/02 351D

Claims (4)

[Claims] 1. A fixed scroll having a fixed end plate and a spiral first wrap standing upright on the end plate inside a compressor housing composed of a front housing and a rear housing to which an intermediate partition plate is attached, and an orbiting end plate. And an orbiting scroll having a spiral second wrap standing upright on the end plate, the orbiting scroll being disposed in mesh with the fixed scroll with the both wraps inside each other, and the spiral second scroll of the orbiting scroll. A revolving mechanism formed on the rear surface of the revolving end plate on the side opposite to the wrap, a self-rotating restraint part that constrains the revolving scroll to rotate and only revolve, and a main bearing on the intermediate partition plate having a plurality of suction passages. The rotary shaft is rotatably supported via a drive shaft, and a drive transmission component for transmitting the drive force from the drive shaft to the rotary mechanism section. An open scroll compressor that performs a compression action from the outer circumference of both wraps toward the center while forming a fluid pocket closed between the wraps by the swirling motion of a roll, wherein the fixed end plate and the discharge port are provided. The rear housing forms a discharge chamber, the rear housing, the fixed end plate, and the intermediate partition plate form a working chamber, and the front housing having a suction port and the intermediate partition plate form a suction chamber. An open type scroll compressor, wherein the intermediate partition plate has the function of the rotation restraint component. 2. A cup-shaped front housing as well as a cup-shaped rear housing, and an intermediate partition plate having ring-shaped projections formed on both sides of this front housing and annular projections fitted in the respective openings of the rear housing. In the interior of the compressor housing which is configured to be hermetically closed, a fixed scroll having a fixed end plate and a first spiral wrap standing upright on the end plate, and a revolving end plate and a second spiral wrap standing upright on the end plate are provided. An orbiting scroll disposed so as to mesh with the fixed scroll with the both wraps inside each other, and an orbiting mechanism portion formed on the back surface of the orbiting end plate opposite to the second wrap spiral of the orbiting scroll. A rotation restraint part for restraining the rotation of the orbiting scroll so that only the orbiting movement is performed, and the intermediate partition play including a plurality of suction passages. A drive shaft rotatably supported via a main bearing, and a drive transmission component for transmitting a drive force from the drive shaft to the orbiting mechanism section, and between the laps by the orbiting movement of the orbiting scroll. In an open type scroll compressor that performs a compression action from the outer circumferences of the both wraps toward the center while forming a closed fluid pocket, a discharge chamber is formed by the rear housing having the fixed end plate and a discharge port, The rear housing, the fixed end plate, and the intermediate partition plate form a working chamber, the front housing provided with a suction port and the intermediate partition plate form a suction chamber, and the intermediate partition plate functions as the rotation restraint component. An open type scroll compressor characterized by having. 3. The open type scroll compressor according to claim 1, wherein a rib is provided in the vicinity of the suction port in the vicinity of the suction passage of the intermediate partition plate so as to face the suction port. 4. The open type according to claim 1, wherein a positioning means is provided in at least one of fitting between the cup-shaped front housing and the intermediate partition plate and fitting between the rear housing and the intermediate partition plate. Scroll compressor.