JP3289331B2 - Scroll fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine equipped with a motor.

[0002]

2. Description of the Related Art Generally, one side of a casing in a longitudinal direction is
The size of the casing in a scroll fluid machine including two scrolls in which a spiral meshes with each other and a motor for rotating one scroll relative to the other scroll on the other side is determined by the size of the spiral in the scroll. It is determined by Also, the motor is
As the size increases, the cost increases and the weight increases. Therefore, conventionally, as shown in JP-A-63-90695, a motor employing a small motor with respect to the inner diameter of the casing has been proposed. ing. As shown in FIG. 2, in this conventional scroll fluid machine, spiral bodies B1 and C1 are provided on one side in the longitudinal direction of a casing A in which both longitudinal ends of a cylindrical body are closed by a first lid and a second lid. First and second scrolls B and C meshing with each other are housed, and a motor E having a drive shaft D for orbiting the second scroll C with respect to the first scroll B is housed in a lower part, and this motor E is housed inside. A frame G composed of a first housing G1 and a second housing G2 is fixed to the motor-side chamber F by press-fitting, the first scroll B is fixed to the first housing G1 of the frame G, and the drive shaft D The scroll-side end of the motor is supported by the first housing G1, and the motor E is sandwiched between the first housing G1 and the second housing G2 via fixing bolts H. And,
The second housing G2 supports the motor of the drive shaft D on the side opposite to the scroll with respect to the motor.

[0003]

When the motor E and the drive shaft D are supported in a cantilever manner with respect to the casing A when the motor is driven by the motor E, the motor E and the drive shaft D are driven during the operation. There is a problem that vibration is generated and a noise is generated due to the vibration.
While being held between the first and second housings G1 and G2, the casing A is assembled into the casing A from an open end on one end before the first lid on one end is mounted. When the other end of the lead wire whose one end is fixed to the coil end E1 of the motor E is connected to a terminal (not shown) provided on one radial side of the casing A, a frame is required. G, it is necessary to insert the second housing G2 and the motor E into the casing A, and to connect the first housing G1 to the outside of the casing A, so that the first housing G1 is connected to one end of the casing A. The first housing G covering the side opening portion
Since 1 is an obstacle, there is also a problem that the work of connecting the lead wires is very difficult and the efficiency of the assembling work is poor.

The motor E is connected to each housing G
Since the cantilever structure is supported between the housings G1 and G2, the supporting legs for the motor protrude from each of the housings G1 and G2 to increase the weight. There is also a problem that processing is required, the number of processing steps is increased, and the cost is increased as a whole.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the vibration during operation while simplifying the use of a small motor with respect to the inner diameter of the casing, and to facilitate the connection of the lead wires. And the structure for supporting the motor can be simplified.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a head plate 2 provided on one side of a casing 1 in the longitudinal direction.
a, 3a and a scroll 2b, 3b, two scrolls 2, 3 in which the scrolls 2b, 3b mesh with each other, and a motor for rotating one scroll relative to the other scroll on the other side. And a first bearing housing 6 having first bearings 6a on both sides of the motor 5 in the casing 1.
And a second bearing housing 7 having a second bearing 7a, and the motor 5 is mounted only on the second bearing housing 7.
, And the drive shaft 4 of the motor 5 is supported by the first bearing 6a and the second bearing 7a in a cantilever manner.

[0007]

The second bearing housing 7 mounted on the casing 1
Since the motor 5 is fixed to the housing 1, the drive shaft 4 can be connected to the first bearing 6a and the second bearing housing 7 of the first bearing housing 6 while reducing the cost by adopting a small motor with respect to the inner diameter of the casing 1. And the second bearing 7a is supported in a two-sided manner, so that vibrations during operation due to driving of the motor 5 can be reduced, and noise caused by this vibration can be reduced. To
Since the motor 5 can be incorporated in the casing 1 separately from the motor 5, when the motor 5 is incorporated in the casing 1 and the lead wires are connected, the connection can be easily performed without being obstructed by the first bearing housing 6. Therefore, the efficiency of the connection work can be improved, and the cost can be reduced.

Further, since the motor 5 is fixed to the second bearing housing 7, there is no need to provide a motor fixing structure in the first bearing housing 6, so that the structure of the first bearing housing 6 can be simplified and further improved. The cost can be reduced and the weight can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The scroll fluid machine shown in FIG. 1 is a refrigerant compressor mainly for compressing a refrigerant of a refrigeration system, and has a cylindrical body 1a and a first lid closing one longitudinal end of the body 1a. A first scroll having a head plate 2a and a spiral body 2b protruding outward from one side of the head plate 2a on one side in the longitudinal direction of the closed casing 1 comprising the first cover 1b and a second lid 1c closing the other end. 2 and a second scroll 3 having a head plate 3a facing the head plate 2a and a spiral body 3b protruding outward from one side of the head plate 3a. The end portions of the windings of the bodies 2b, 3b are overlapped so as to mesh with each other at a position deviated by approximately 180 °, and the discharge port 2c is provided at the center side of the end plate 2a of the first scroll 2.
In addition, a suction chamber 2d is provided on the outer peripheral side, and two working spaces formed between the spiral bodies 2b, 3b by the revolving motion of the second scroll 3 with respect to the first scroll 2 are provided at the center. The second scroll 3 is moved to the other side of the casing 1 by moving the second scroll 3 in the direction of the discharge port 2 c while reducing the volume while performing the compression action.
A motor 5 having a drive shaft 4 for orbiting the scroll 2 is provided.

The embodiment shown in FIG. 1 is a compressor constructed as described above, wherein a first bearing 6a is provided on one side of the motor 5 in the casing 1.
A bearing housing 6 is provided, and a second bearing housing 7 having a second bearing 7a is attached to the other side of the motor 5, and a stator 5a of the motor 5 is mounted on the second bearing housing 7.
Are fixed by fixing bolts 8, and both ends of the drive shaft 4 are supported by the first bearing 6a and the second bearing 7a in a freely rotatable manner in a cantilever manner.

The first bearing housing 6 includes a thrust bearing 6b which is in contact with the back surface of the end plate 3a of the second scroll 3.
And the first bearing 6 on the center side with respect to the thrust bearing 6b.
a, and a receiving recess 6c that is continuous with the first bearing 6a and that receives the eccentric portion 4a provided at the scroll-side end of the drive shaft 4.
And the thrust bearing 6 of the first bearing housing 6.
b supports the rear surface of the end plate 3a, and the first scroll 2 is fixed to the outer peripheral side of the first bearing housing 6 with mounting bolts 9.

The second bearing housing 7 is provided with the second bearing 7a on the center side and the receiving seat 7b on the outer peripheral side, and the stator 5a is provided between the second bearing 7a and the receiving seat 7b. Of the receiving seat 7b.
The lower end surface of the outer peripheral portion of the stator 5a is supported, and the fixing bolt 8 is inserted into a through hole 5b provided on the outer peripheral portion of the stator 5a, and the fixing bolt 8 is inserted into a screw hole provided in the receiving seat 7b. The motor 5 is fixed to the second bearing housing 7 by screwing.

A welding pin 10 is mounted on the outer peripheral portion of each of the bearing housings 6 and 7, and a welding hole is provided in a portion of the casing 1 facing the welding pin 10,
The welding pins 10 are welded to the welding holes from outside the casing 1 to fix the bearing housings 6 and 7 to the casing 1.

The drive shaft 4 is provided with the first bearing 6a.
The eccentric portion 4a having the eccentric hole 4b at the scroll side end portion with respect to the supporting portion is provided, and the eccentric portion 4a is inserted into the receiving recess 6c of the first bearing housing 6, and the eccentric hole 4b is A shaft 3c protruding from the rear surface of the end plate 3a of the second scroll 3 is rotatably fitted via a bearing metal 11, and a lubrication pump 12 is provided at an end of the motor 5 of the drive shaft 4 opposite to the scroll. Thus, the oil pumped from the bottom oil reservoir 13 of the casing 1 is supplied to an oil supply passage 14 provided at the center of the drive shaft 4. The oil supply passage 14 is opened at the bottom of the eccentric hole 4b, and a balance weight 15 is formed in the eccentric portion 4a.
And the eccentric hole 4b passing through the back surface of the bearing metal 11.
And an oil passage 16 that opens to the scroll side end surface of the eccentric portion 4a. The oil that has flowed out of the oil passage 16 is splashed off by the centrifugal force generated by the rotation of the eccentric portion 4a, and the oil flows to the thrust bearing 6b. They refuel by splashing.

The oil supply passage 14 is formed from one end to the other end of the drive shaft 4, and a branch path 14a opening on the inner peripheral surface of the first bearing 6a is provided on the scroll side of the oil supply passage 14. The oil supplied from the lubrication pump 12 is supplied to the first bearing 6a and the eccentric hole 4b.

A partition 18 having a communication passage 18a communicating with the discharge port 2c is provided on the back side of the first scroll 2 in the casing 1 to define a high-pressure chamber 19. A high-pressure pipe 20 is opened at the same time, and a low-pressure pipe 22 is opened at a low-pressure side space 21 on the side opposite to the high-pressure chamber with respect to the partition wall 18 to form a low-pressure dome.
Gas passages (not shown) open in the bearing housing 6 to the low pressure side space 21 and the low pressure sides of the scrolls 2 and 3.
Is provided.

In FIG. 1, reference numeral 23 denotes an Oldham coupling provided between the second scroll 3 and the first bearing housing 6 to prevent the second scroll 3 from rotating and to make a revolving motion. An oil drain hole provided in the bearing housing 6.

As described above, the second component attached to the casing 1
Since the motor 5 is fixed to the bearing housing 7 with the fixing bolts 8, a small motor can be adopted for the inner diameter of the casing 1, and the drive shaft 4 is connected to the first bearing of the first bearing housing 6. Since the bearing 6a and the second bearing 7a of the second bearing housing 7 support the bearing in a double-supported manner, vibration during operation due to driving of the motor 5 can be reduced, and noise caused by the vibration can be reduced.

The motor 5 is assembled with the second bearing housing 7 into the casing 1 from the open end on one end side of the casing 1 before the first lid 1b is mounted, with the motor 5 fixed to the second bearing housing 7. Thereafter, since the first bearing housing 6 can be assembled from one end side open portion of the casing 1, a lead wire (not shown) fixed to the coil end 5c of the motor 5 before the first bearing housing 6 is assembled. ) Can be easily connected to the terminal 24 provided on one side of the casing 1.

Further, by fixing the motor 5 to the second bearing housing 7, the first bearing housing 6 does not need to be provided with support legs for supporting the motor as in the conventional example shown in FIG. Therefore, the space between the first bearing housing 6 and the motor 5 can be widened, and the flow resistance of the suction gas fluid sucked into the low-pressure side space 21 from the low-pressure pipe 22 can be reduced accordingly, and the pressure of the suction gas fluid can be reduced. The loss can be reduced and the capacity can be increased. In addition, since the first bearing housing 6 does not need to be subjected to spigot processing, the first bearing housing 6 does not need to be provided with the first bearing housing.
The structure of the bearing housing 6 can be simplified, the cost can be reduced, and the weight can be reduced.

Although the embodiment described above is an example applied to a refrigerant compressor, it can be applied to other compressors and expanders.

Further, one of the scrolls 2 and 3 is a fixed scroll and the other scroll 3 is a movable scroll. However, both the scrolls 2 and 3 may be movable.

A high-pressure chamber 19 and a low-pressure side space 21 are provided in the casing 1 with a partition 18 interposed therebetween, and a high-pressure pipe 20 is opened in the high-pressure chamber 19 and a low-pressure pipe 22 is opened in the low-pressure side space 21. Although a low-pressure dome type is used, a high-pressure dome type may also be used.

In the above description, the casing 1 is of the vertical type in which the casing 1 is placed vertically, but may be of the horizontal type in which the casing 1 is placed horizontally.

[0025]

As described above, according to the present invention, since the motor 5 is fixed to the second bearing housing 7 attached to the casing 1, a small motor can be adopted for the inner diameter of the casing 1 and the cost can be reduced. The drive shaft 4 is connected to the first
Since the first bearing 6a of the bearing housing 6 and the second bearing 7a of the second bearing housing 7 are supported in a double-supporting manner, vibration during operation by driving the motor can be reduced, and noise caused by the vibration can be reduced. In addition, since the first bearing housing 6 can be incorporated in the casing 1 separately from the motor, when the motor 5 is incorporated in the casing 1 and the lead wires are connected, the first bearing housing 6 can be reduced. The connection can be easily performed without being disturbed by the bearing housing 6, the efficiency of the connection operation can be improved, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Scroll 3 Scroll 2a, 3a End plate 2b, 3b Spiral body 4 Drive shaft 5 Motor 6 First bearing housing 6a First bearing 7 Second bearing housing 7a Second bearing

Continuation of the front page (72) Inventor Jin Ozawa 3-12 Chikushinmachi, Sakai-shi, Osaka Daikin Industries Co., Ltd. Sakai Plant Rinkai Plant (56) References JP-A-2-136324 (JP, A) 1-105782 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311 F01C 1/02

Claims (1)

(57) [Claims] An end plate (2) is provided on one side in a longitudinal direction of a casing (1).
a, 3a and a scroll 2b, 3b, two scrolls 2, 3 in which the scrolls 2b, 3b mesh with each other, and a motor for rotating one scroll relative to the other scroll on the other side. And a first bearing housing 6 having first bearings 6a on both sides of the motor 5 in the casing 1.
And a second bearing housing 7 having a second bearing 7a, and the motor 5 is mounted only on the second bearing housing 7.
And a drive shaft 4 of the motor 5 is supported by the first bearing 6a and the second bearing 7a in a cantilever manner.