JPH08261165A - Scroll compressor - Google Patents

Abstract

(57) [Abstract] [Object] The present invention forms a tubular member integrally with a front housing that constitutes a compressor housing, and attaches a second counterweight to a drive shaft between the first counterweight and a main bearing. This aims to reduce the number of parts, the assembly process, the cost and the productivity. [Structure] The compressor housing 3 is replaced by the front housing 3
1 and the rear housing 35, the second counterweight 42 is attached to the drive shaft 9 between the main bearing 15 and the first counterweight 41, and the second counterweight 42 can be attached and removed from the orbiting scroll 2 side. And With this configuration, it is possible to reduce the number of parts, the assembly process, and the workability in assembly and service.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor assembly structure suitable for air-conditioning and refrigerating compressors.

[0002]

2. Description of the Related Art Generally, as a scroll compressor of this type, an automobile air-conditioning compressor disclosed in Japanese Patent Publication No. 61-15276 is taken as an example, and the basic structure thereof will be described with reference to FIGS. explain. FIG. 3 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 as both a method of supporting the thrust force applied to the orbiting end plate and a rotation restraint component. The configuration in which the driving force from the engine is transmitted to the compressor body via the belt and the electromagnetic clutch is simplified as a known fact.

The main parts that make up the compressor body are:
First, the compressor housing 3 forming the outer shell of the compressor body is divided into a cup-shaped case 37 and a front end plate 38, and one end opening 37 a of the cup-shaped case 37 is closed by the front end plate 38. Inside the compressor housing 3, a fixed scroll 1 formed by forming a spiral wrap 1b standing upright on a fixed end plate 1a,
Form a spiral wrap 2b upright on the swivel end plate 2a,
An orbiting scroll 2 formed by engaging the fixed scroll 1 with the wraps 1b and 2b inside and an orbiting end plate 2
2a between the front end plate 38 and the front end plate 38a.
A ring-shaped orbiting scroll side race 71 that also serves as a thrust bearing component and a rotation restraint component, arranged in parallel with
It comprises an orbiting scroll side ring 72, a ring-shaped plate side race 73, a plate side ring 74, a plurality of ball elements 76, and a drive mechanism for transmitting an orbiting motion to the orbiting scroll 2. Fixed scroll 1 is wrap 1b
Fastening leg 1d provided on the rear surface of the fixed end plate 1a opposite to
And the cup-shaped case 37 are fastened with bolts 19. The O-ring 18 inserted in the seal groove 1f of the outer peripheral portion 1e of the fixed end plate 1a is attached between the O-ring 18 and the cup-shaped case 37, and is divided into the high pressure chamber 11 on the fastening leg 1d side and the low pressure chamber 12 on the lap 1b side. ing. Swivel end plate 2
Between the a and the front end plate 38, the orbiting end plate 2 is covered with a ring-shaped orbiting scroll side race 71.
The orbiting scroll side ring 72 is attached to a, and the plate side ring 7 is attached to the front end plate 38 so as to cover the ring-shaped plate side race 73 and to form a slight gap with the orbiting scroll side ring 72.
4 is attached. Orbiting scroll side ring 72
The plate-side ring 74 is provided with holes 75 that form a plurality of pockets having the same diameter in the axial direction, and a plurality of ball elements 76 are always held in the holes 75, so that the fixed scroll 1 is restrained while rotating. It also has a function as a thrust bearing component of the orbiting scroll 2 while permitting its orbiting motion with respect to. The drive shaft 9 is rotatably supported via a main bearing 15 that is press-fitted and fitted to the front end plate 38, and is fitted into a tubular member 39 that is attached to the front end plate 38. The main shaft portion 9b extends to the outside of the compressor housing 3 through the shaft sealing device 17 and the auxiliary bearing 16.
The drive pin 9 at the end of the drive shaft 9 on the side of the orbiting scroll 2
b is connected to a swivel bush 8 having a function as a drive transmission mechanism, and the swivel bush 8 is a swivel bearing provided on a cylindrical boss portion 2c formed as a swivel mechanism portion on the back surface of the swivel end plate 2a. It is inserted in 7. With this configuration, the orbiting scroll 2 can include a drive mechanism that causes the fixed scroll 1 to orbit. A suction port 13 for sucking a refrigerant as a working fluid is provided on the low pressure chamber 12 side of the cup-shaped case 37, and a discharge port 14 for discharging the refrigerant is provided on the high pressure chamber 11 side.

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 low pressure chamber 12 in the compressor housing 3 through the suction port 13. Next, the fixed end plate 1a and its spiral wrap 1
b, and is sent into the fluid pocket 10 of the closed space formed by the swirl end plate 2a and its spiral wrap 2b, and is compressed from the outermost peripheral portions of both laps 1b, 2b toward the central portion. The compressed refrigerant gas is discharged into the high pressure 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.

At this time, a first counterweight 41 is attached to the orbiting bush 8 in order to cancel the centrifugal force generated by the orbiting movement of the orbiting scroll 2 and the rotating movement of the orbiting bush 8. A second counterweight 42 for generating a centrifugal force in the same direction as the first counterweight is provided on the side of the auxiliary bearing 16 opposite to the first counterweight 41 with respect to the main bearing 15 rotatably fitted to the drive shaft 9. It is provided. The armature plate 53 of the electromagnetic clutch 50 is attached to the outer end of the main shaft portion 9b of the drive shaft 9. The electromagnetic clutch 50 includes a pulley 51 and a coil 52.
And the armature plate 53, the coil 52 is energized from the outside by the armature plate 53 being attracted to the pulley 51, so that the rotational force of the pulley 51 is transmitted to the drive shaft 9 via the armature plate 53. There is. The third counterweight 43 is attached to the amateur plate 53 in the direction opposite to the first counterweight 41, and the moment generated by the centrifugal force between the third counterweight 43 and the second counterweight 42
The respective weights are distributed so as to cancel out the moment generated by the centrifugal force generated by the orbiting scroll 2 and the orbiting bush 8.

[0006]

In the conventional scroll compressor shown in FIG. 3, a second counterweight, a shaft seal device and a sub bearing are provided around the drive shaft between the main bearing and the armature plate. However, this configuration is the first to cancel the centrifugal force of the orbiting scroll and the orbiting bush,
Although there is an advantage that the bearing load on the main bearing and the auxiliary bearing due to the centrifugal force of the second and third counterweights can be kept low, when these assembled parts have to be removed, the main bearing will be Since it is supported by press-fitting to the plate, the tubular member attached to the front end plate is formed by another member. Especially when the second counterweight is removed, it becomes a necessary condition. Therefore, the structure of the compressor housing must be made up of three parts, the cup-shaped case, the front end plate, and the tubular member. The front end plate and the tubular member are integrated with the assembly member to reduce costs by reducing the number of assembly steps. However, there is a problem in assembling and servicing that the second counterweight cannot be taken out if it is molded.

The object of the present invention has been made in view of the problems in the conventional scroll compressor shown in FIG. 3, in which the compressor housing forming the outer structure of the compressor body is provided with the front end plate and the tubular member. Is divided into a front housing and a rear housing that are integrally molded, and the second counterweight is positioned between the main bearing and the first counterweight that are press-fitted into the front housing and attached to the drive shaft. An object of the present invention is to provide a scroll compressor that solves problems such as complexity and difficulty in assembling and servicing by adopting a structure that can be attached and detached from the orbiting scroll side.

[0008]

To achieve the above object, a scroll compressor according to the present invention comprises a fixed scroll having a fixed end plate and an upright spiral wrap inside a compressor housing; An orbiting scroll having upright spiral wraps, which are arranged in mesh with the fixed scroll with the wraps inside each other, and an orbit formed on the back end of the orbiting end plate opposite to the spiral wrap of the orbiting scroll. A mechanical portion, a flat plate-shaped thrust bearing that axially supports the thrust force applied to the orbiting scroll, and a compressor housing that is rotatably supported via a main bearing and passes through a shaft sealing device and a sub bearing to compress the compression. A drive shaft having a main shaft portion extending to the outside of the machine housing; a drive transmission component for transmitting a drive force from the drive shaft to the swing mechanism section; A rotation restraint part that restrains the rotation of the orbiting scroll and only makes a turn, and compresses from the outer circumference of both wraps toward the center while forming a fluid pocket closed between both wraps by the turning motion of the orbiting scroll. In the scroll compressor, the compressor housing is divided into two parts, a front housing and a rear housing, the main bearing is press-fitted and supported in the front housing, and the drive is provided between the orbiting scroll and the main bearing. The transmission component is provided with a first counterweight for canceling the dynamic imbalance due to the orbiting and rotational movements of the orbiting scroll and the drive transmission component, and the drive shaft is provided with a centrifugal force in the same direction as the first counterweight. A second counterweight is attached to cancel the dynamic imbalance on the outer end of the spindle. Further comprising a further counteract third counterweight the moment generated by centrifugal force for a scroll compressor according to claim.

[0009]

According to the present invention, by adopting the above-mentioned structure, the problems such as the complexity and difficulty in assembling or servicing the compressor body, the increase in the number of assembling parts and the number of assembling steps can be solved. .

[0010]

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

FIG. 1 shows the basic construction of an embodiment of the present invention. The compressor housing 3 is a front housing 3.
1 and the rear housing 35 are divided and configured,
A fixed scroll 1 having a fixed end plate 1a and a spiral wrap 1b standing upright on the fixed end plate 1a, a swivel end plate 2a and a spiral wrap 2b standing upright on the swivel end plate 2a, and both wraps 1b and 2b. The orbiting scrolls 2 meshing with the fixed scroll 1 are arranged with the insides of each other. As the orbiting mechanism, a cylindrical boss 2c is formed on the back surface of the orbiting end plate 2a on the side opposite to the spiral wrap 2b of the orbiting scroll 2, and the orbiting bearing 7 is provided on the boss 2c. The drive shaft 9 is rotatably supported via a main bearing 15 that is at least press-fitted and attached to the front housing 31, penetrates the shaft sealing device 17 and the auxiliary bearing 16, and extends the main shaft portion 9b to the outside of the front housing 31. I have put it out. The drive pin 9a at the end of the drive shaft 9 on the side of the orbiting scroll 2 is connected to the orbiting bush 8 as a drive transmission mechanism inserted in the orbiting bearing 7, and the drive pin 9a.
Orbiting scroll 2 by transmitting the driving force from
Giving a swirling motion to. Between the orbiting end plate 2a and the front housing 31, a flat plate-shaped thrust bearing 4 which axially supports the thrust force applied to the orbiting scroll 2 in parallel with the orbiting end plate 2a, and the orbiting scroll 2 is constrained to rotate to turn. The Oldham ring 5 having a function as a rotation restraint component for restricting the rotation and the rotation restraint component 6 for restraining the motion of the Oldham ring 5 in only one direction perpendicular to the drive shaft 9 are arranged in the vicinity of the Oldham ring 5. There is. The rotation restraining means will be described in detail. As the first engaging means that can move between the Oldham ring 5 and the orbiting scroll 2 only in the first radial direction, the orbiting end plate 2a is provided with a first radial direction. A pair of keyways 21, a first pair of keys 25 of an Oldham ring 5 inserted into the first pair of radial keyways 21 and sliding along the keyways 21 and the thrust bearing 4, and Oldham Between the ring 5 and the rotation restraint component 6, as the second engaging means that is movable only in the second radial direction that is at an angle to the first radial direction, the second member is attached to the rotation restraint component 6. Of the key groove 22 and the second pair of key grooves 22 in the second radial direction.
And Oldham ring 5 that slides along thrust bearing 4
And a second pair of keys 26.

Now, the orbiting scroll 2 and the orbiting bush 8
The first counterweight 41 for canceling the dynamic imbalance due to the turning and rotating motions of the main bearing 15 is attached to the turning bush 8 and the second counterweight for generating a centrifugal force in the same direction as the first counterweight 41 and the main bearing 15 are provided. It is attached to the drive shaft 9 between the counter weights 41. Further, an electromagnetic clutch 50 attached to the outer end of the main shaft portion 9b of the drive shaft 9 is attached to further cancel the moment generated by the centrifugal force for canceling the dynamic imbalance in the armature plate 53 constituting the electromagnetic clutch 50. Three counterweights 43 are attached.

By the orbiting motion of the orbiting scroll 2, the refrigerant is taken from the outside of the compressor housing 3 into the low pressure chamber 12 inside through the suction port 13 of the front housing 31, and the fixed scroll 1 and the orbiting scroll 2 both wraps 1b. 2b is guided near the outer circumference. Then, by the orbiting motion of the orbiting scroll 2, the fluid is sucked into the fluid pocket 10 closed between the wraps 1b and 2b,
It is compressed in the same manner as in the conventional case while being compressed from the outer circumference of 2b toward the center while being compressed and discharged through the discharge gas hole 1c of the fixed mirror plate 1a to the high pressure chamber 11.

With this configuration, the number of parts such as the thrust bearing parts and the rotation restraint parts can be reduced, while the drive shaft and the second counterweight attached to the drive shaft can be easily assembled and removed. It is possible to do so.

[0015]

Since the present invention has the above-described structure, the compressor body assembly, especially the drive shaft assembly,
The tubular member can be integrated with the front housing without forming a separate component, the number of components can be reduced and the assembly process can be reduced, and the cost and the productivity can be improved. Also, the second counterweight can be removed from the orbiting scroll side, so that it is possible to easily perform service work.

[Brief description of drawings]

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

[Fig. 2] Configuration development view of the main parts

FIG. 3 is a cross-sectional view of a scroll compressor having a ball joint as a conventional example.

FIG. 4 is a structural development view of main parts of the conventional machine.

[Explanation of symbols]

 1 Fixed scroll 1a Fixed end plate 1b 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 Swivel end plate 2b Orbital wrap of spiral scroll 2c Boss section 3 Compressor housing 4 Thrust Bearing 5 Oldham Ring 6 Rotation Restraint Part 7 Swing Bearing 8 Swing Bushing 9 Drive Shaft 9a Drive Pin 9b Main Shaft Part 10 Fluid Pocket 11 High Pressure Chamber 12 Low Pressure Chamber 13 Suction Port 14 Discharge Port 15 Main Bearing 16 Sub Bearing 17 Shaft Sealing Device 18 O-ring 19 Bolt 21 First radial key groove 22 Second radial key groove 25 First radial key 26 Second radial key 30 Front housing 35 Rear housing 37 Cup-shaped case 37a One end opening 38 Front end play 39 Cylindrical member 41 First counterweight 42 Second counterweight 43 Third counterweight 50 Electromagnetic clutch 51 Amateur plate 52 Pulley 53 Coil 71 Orbiting scroll side race 72 Orbiting scroll side ring 73 Plate side race 74 Plate side ring 75 Hole 76 Multiple ball elements

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Michio Yamamura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A compressor housing, wherein a fixed scroll having a fixed end plate and a spiral wrap standing upright on the fixed end plate, a swivel end plate and a spiral wrap standing upright on the swirl end plate are provided inside the compressor housing. The orbiting scrolls that are arranged so as to be inside each other and meshed with the fixed scroll, the orbiting mechanism portion formed on the back face of the orbiting end plate opposite to the spiral wrap of the orbiting scroll, and the thrust force applied to the orbiting scroll. A flat thrust bearing that supports in the axial direction, and a drive that extends rotatably in the compressor housing through a main bearing and extends through the shaft sealing device and the sub bearing to the outside of the compressor housing. A shaft, a drive transmission component for transmitting a driving force from the drive shaft to the orbiting mechanism portion, and a rotation restraint for restraining the rotation of the orbiting scroll so that only the rotation is performed. A scroll compressor that includes a component and that performs a compression action from the outer periphery of both wraps toward the center while forming a fluid pocket closed between the wraps by the orbiting motion of the orbiting scroll. The front housing and the rear housing, and the main bearing is press-fitted into and supported by the front housing, and the drive transmission component between the orbiting scroll and the main bearing has the orbiting scroll and the orbit of the drive transmission component. And a first counterweight for canceling the dynamic imbalance due to the rotational movement, a second counterweight for generating a centrifugal force in the same direction as the first counterweight is attached to the drive shaft, and the main shaft outer end portion is provided. Further cancel the moment generated by centrifugal force to cancel the dynamic imbalance. Scroll compressor comprising the counterweight.