JP3290207B2 - Fluid compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid compressor used for, for example, a refrigeration cycle apparatus for compressing a refrigerant gas as a fluid.

[0002]

2. Description of the Related Art As a hermetic compressor for a refrigerant gas used in a refrigeration cycle apparatus, a relatively simple structure can improve the sealability and perform efficient compression, and also facilitates the production and assembly of parts. Fluid compressors.

[0003] In this method, a cylinder is accommodated in a sealed case, and both ends of the cylinder are rotatably pivotally supported via bearings provided in the sealed case. A rotor piston, which is a rotating body, is disposed in the cylinder, and the shafts at both ends thereof are rotatably supported by the bearings eccentrically with respect to the cylinder. A spiral groove is provided on the outer peripheral surface of the rotor piston, and a blade is wound around the spiral groove so as to be freely protruded and retracted.

[0004] The cylinder and the piston are connected by a rotational force transmitting mechanism, and they are relatively rotated to take refrigerant gas into a compression chamber, which is an operating space defined by the cylinder, the piston, and the blade.

[0005] The compression chamber is formed so that its capacity is gradually reduced in the axial direction. The refrigerant gas sequentially transferred to the compression chamber is compressed, and is discharged from the compression chamber into the closed case in a state of being raised to a predetermined pressure. Then, it is led from the discharge pipe to a condenser constituting a refrigeration cycle.

[0006]

As described above, in a compressor of the type in which a piston in which a blade is wound around a spiral groove is housed in a cylinder, the pressure applied to the suction portion and the discharge portion of the cylinder and the rotor piston is increased. A pressure difference is generated in the piston, or a friction between the blade and the groove causes a force to move the blade to the discharge portion side or the suction portion side with the relative movement between the piston and the blade.

[0007] Under the influence of this force, the blade moves along the spiral groove, and when the blade end face repeatedly contacts the discharge-side end or the suction-side end of the spiral groove, The end of the blade wears.

Conventionally, as shown in FIG. 5, a blade stopper groove a is provided at both ends of the rotor piston P on the discharge portion D side and the suction portion S side so as to communicate with both ends of the spiral groove M. , B, into which a blade stopper provided on a cylinder (not shown) is inserted. That is, the blade stoppers (not shown) are provided with the blade stopper grooves a and b.
Into the spiral groove M
Regulates contact with

However, this time, the blade stopper is inserted into the blade stopper grooves a and b.
For example, at startup, the suction portion S and the discharge portion D of the piston P
The pressure balance applied to both end faces of the
When the blade moves in the axial direction with respect to the cylinder, the ends of the blade stopper grooves a and b hit the blade stopper, and abnormal noise is generated.

Therefore, basically, with the blade stopper and the blade stopper grooves a and b left,
Even if the rotor piston P moves in the axial direction, the collision of the blade stopper grooves a and b with the blade stopper is prevented,
The problem of abnormal noise must be eliminated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to reliably restrict movement of a blade fitted into a spiral groove to a suction portion and a discharge portion, and to provide a blade stopper. It is an object of the present invention to provide a fluid compressor capable of preventing a collision between the blade and a blade stopper groove and generating abnormal noise, enabling a quiet operation, and improving reliability.

[0012]

In order to achieve the above object, the present invention provides an eccentric arrangement of a rotating body having a spiral groove into which a blade is inserted so as to be able to protrude and retract, in the cylinder. By relatively rotating, the fluid compressor which compresses while gradually transferring the fluid from the suction portion located at one end in the axial direction of the cylinder to the discharge portion located at the other end,

The suction portion and the discharge portion of the cylinder are provided with a blade stopper for restricting the movement of the blade toward the end of the spiral groove, and the suction portion and the discharge portion of the rotating body are provided with end portions of the blade stopper. Is provided, and a concave groove communicating with an end of the spiral groove is provided. At least one of the concave grooves is formed in a long hole shape in the axial direction.
The blade stopper in the axial direction
A fluid compressor characterized in that it is provided at a position where it does not come into contact with the concave groove even when it moves .

[0014]

At the time of startup, the suction pressure and the discharge pressure are likely to be different from the design values, the pressure balance applied to both ends of the piston is lost, and the rotating body moves in the axial direction with respect to the cylinder.

At this time, the blade stopper is inserted.
Recessed groove provided in the rotating body is moved in the axial direction, which
At least one of the concave grooves is long in the axial direction
It is shaped like a long hole and the blade stopper is turned
A position where the rolling element does not come into contact with the concave groove even if it moves in the axial direction.
, It does not collide with the blade stopper, so that no noise is generated.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the compressor body 1 has a hermetically sealed case 2 whose both ends are closed with its axial direction oriented in the horizontal direction.
And a motor unit 3 and a compressor unit 4 housed in the closed case 2.

The closed case 2 includes a cylindrical case body 2a having both ends opened, a closing plate 2b for closing one end opening by welding means, and an upper lid part 2c for closing the other end opening by welding means. Become.

The compressor section 4 has a cylinder 5 formed of a hollow cylinder, and a rotor 6 formed of a magnet constituting the motor section 3 is coaxially fitted on the outer peripheral surface of the cylinder 5. ing. A stator 7 is fitted on the inner peripheral surface of the closed case 2, and the motor unit 3 is configured together with the rotor 6.

A main bearing 8 is airtightly fitted and loosely fitted into one end opening of the cylinder 5. The main bearing 8 is provided integrally with the axial center of the closing plate 2b for closing one open end of the sealing case 2. A sub-bearing 9 as a bearing located on the other side of the sealing case 2 is airtightly and loosely fitted into the other end opening of the cylinder 5. That is, the opening at both ends of the cylinder 5 is hermetically closed by the main and sub bearings 8 and 9, and the cylinder 5 itself is rotatably supported. The auxiliary bearing 9 is provided at a predetermined distance from the other side surface of the sealed case 2, and is attached and fixed to a support plate 10 that partitions the inside of the sealed case 2.

On the other hand, in the hollow portion of the cylinder 5, a rotor piston 12 as a columnar rotating body is accommodated along the axial direction. The central axis of this rotor piston 12 is
The piston 12 is arranged eccentrically with respect to the central axis, and a part of the outer peripheral surface of the piston 12 is in contact with the inner peripheral surface of the cylinder 5 along the axial direction. A drive mechanism is provided on one end of the rotor piston 12 together with the electric motor unit 3.

A rotational force transmitting section 14 constituting 13 is provided. The rotational force transmitting unit 14 connects the cylinder 5 and the piston 12 and, when the cylinder 5 is rotationally driven, transmits the rotational force to the piston 12 to perform a relative rotational drive.

On the other hand, the outer peripheral surface of the rotor piston 12 has a spiral groove (not shown in the drawing) having a gradually smaller pitch from the pivot side of the auxiliary bearing 9 to the pivot side of the main bearing 8 of the piston 12. A spiral blade 16 (indicated by a dashed line) whose thickness is approximately equal to the width of the groove is fitted into the groove.

Each portion of the blade 16 can freely protrude and retract from the groove along the radial direction of the piston 12 and can slide with its outer peripheral surface in close contact with the inner peripheral surface of the cylinder 5.

The inner peripheral surface of the cylinder 5 and the rotor piston 1
The space between the two outer peripheral surfaces is partitioned by the blade 16 into a plurality of compression chambers 17 which are working spaces. The volume of the compression chamber 17 gradually decreases from the pivot side of the auxiliary bearing 9 to the pivot side of the main bearing 8 of the piston 12 due to the setting of the pitch of the groove.

An outlet 18 is provided in a portion of the cylinder 5 adjacent to the compression chamber 17 having the smallest pitch and having a small capacity, and communicates the compression chamber 17 with the inside of the closed case 2.

That is, the right end of the cylinder 5 and the rotor piston 12 in the drawing is a discharge portion D as described later, and the left end in the drawing is a suction portion S as described later. As shown in FIGS. 1A and 1C, a blade stopper groove 20 </ b> A which is a concave groove is provided on the discharge part D side of the rotor piston 12.

The blade stopper groove 20A is formed to have a concave cross section, and one side end thereof communicates with the end of the spiral groove 15 and substantially coincides with the side surface thereof, and extends along the axial direction. At the same time, the other side face is provided so as to penetrate the end face of the body portion 12a of the piston 12. FIG. 1 (A),
As shown in (B), a blade stopper groove 20B, which is a concave groove, is provided on the suction portion S side of the rotor piston 12.

The blade stopper groove 20B is also formed to have a concave cross section, and one side end thereof communicates with the end of the spiral groove 15 and substantially coincides with the side surface thereof, and extends along the axial direction. At the same time, the other side face is provided so as to penetrate the end face of the body portion 12a of the piston 12.

As shown in FIG. 2 again, the ends of the blade stoppers 21a and 21b provided on both ends of the cylinder 5 are inserted into the blade stopper grooves 20A and 20B. In terms of design, grooves 20A and 20B for blade stopper
Each of the blade stoppers 21
It is set so that the end portions a and 21b are located. And this
At least these blade stopper grooves 20A and 20B
One of them is to be formed in the shape of a long slot in the axial direction.
In addition, the blade stoppers 21a and 21b are
Even if the stone 12 moves in the axial direction, the blade stopper
Is provided at a position that does not abut against the grooves 20A and 20B.
You.

When the helical blade 16 that fits into the helical groove 15 so as to be able to protrude and retract moves in the direction of the discharge part D or the suction part S, the moving direction of the blade 16 End of blade stopper groove 2
0A or 20B, and when further movement occurs, this end face is moved to the blade stopper 21a or 21b.
And further helical movement is prevented.

On the other hand, a suction pipe 22 as a refrigeration cycle suction section is connected to the closing plate 2b, and the rotor piston 1
The second main bearing 8 communicates from the shaft end face to the suction passage 23 provided along the axial direction. The other end of the suction passage 23 opens into the compression chamber 17 on the suction part S side of the piston 12. A discharge pipe 24, which is a refrigeration cycle discharge part, is connected to the side surface of the closed case 2 near the auxiliary bearing 9.

An oil reservoir 25 for collecting lubricating oil is formed in the inner bottom of the closed case 2, and the end of an oil suction pipe 26 provided in the auxiliary bearing 9 is immersed in the lubricating oil. I do. An oil supply pump 27 is provided integrally with the piston 12 so as to face the upper end of the oil suction pipe 26,
Further, it communicates with an oil supply passage 28 provided along the axial direction. The auxiliary bearing 9 is provided on the support plate 10 by the centering mechanism 2.
9, the position of the auxiliary bearing 9 with respect to the main bearing 8 can be adjusted during assembly.

A terminal 30 is provided on the left end face of the sealed case 2 to be electrically connected to an external power source via a lead wire. Further, the lead wire 31 extending from the stator 7 of the motor unit 3 is connected to the terminal 3.
0 is connected to a cluster 32 provided integrally on the inside of the sealed case 2. The lead wire 31 that connects the electric motor unit 3 and the cluster 32 is extended halfway through a notch 33 provided in the support plate 10.

That is, the notch 33 and the closed case 2
A gas passage which also serves as an oil return passage is formed in the space between them, but the space is only the minimum necessary size.

Therefore, if the lead wire 31 is loosened even a little, it comes into contact with the inner peripheral surface of the sealed case 2. In this case, when the upper lid 2c is welded and fixed to the case main body 2a of the sealed case 2, heat is transmitted to the lead wire 31 via the sealed case 2, and this burning accident is likely to occur.

Therefore, a groove 34 as a wire fixing portion is provided on the end face of the notch 33 of the support plate 10, and the lead wire 3
1 is fitted and held. The lead wire 31 is
Since there is no looseness as a whole and there is no contact with the inner peripheral surface of the sealed case 2, there is no heat transfer to the lead wire 31 when welding the upper cover 2 c to the case body 2 a, and a burnout accident occurs. Nor.

FIG. 3 shows a supporting plate 1 deformed from the above embodiment.
0A, notches 33a and 33b are provided at the upper and lower ends, and a groove 34 for fitting and holding an intermediate portion of a lead wire (not shown) only on the lower side.
A is provided. In addition, 9 shown in the figure is an auxiliary bearing, and 2
Reference numeral 9a denotes an Oldham ring that constitutes the centering mechanism 29. FIG. 4 shows still another modification of the support plate 10B, in which a notch 33c is provided only on the lower side, and a groove for the same purpose as in the above embodiment is provided here. Next, the operation of the fluid compressor configured as described above will be described.

The motor 5 is energized to rotate the cylinder 5. This rotation is transmitted to the rotor piston 12 via the rotational force transmitting unit 14, and is driven to rotate while a part of the outer peripheral surface is in contact with the inner peripheral surface of the cylinder 5, and the blade 16 also rotates integrally.

The blade 16 has an outer peripheral surface of the cylinder 5
Since it rotates in contact with the inner peripheral surface, it is pushed into the spiral groove 15 as it approaches the contact portion between the outer peripheral surface of the piston 12 and the inner peripheral surface of the cylinder 5, and from the groove 15 as it moves away from the contact portion. Move in the popping direction.

On the other hand, a low-pressure refrigerant gas is guided from the suction pipe 22 to the suction passage 23, and is discharged from the opening end into the cylinder 5 on the suction portion S side. Further, the compression chamber 1 between the inner peripheral surface of the cylinder 5, the outer peripheral surface of the piston 12 and the winding of the blade 16.
7, the air is sequentially transferred in the direction of the discharge portion D with the rotation of the rotor piston 12, and compressed as the compression capacity decreases.

When the compressed refrigerant gas rises to a predetermined pressure, the compressed refrigerant gas is discharged from the compression chamber 17 on the discharge section D side to the outlet 1.
The liquid is discharged into the internal space of the sealed case 2 through the space 8 and is filled. Further, the high-pressure refrigerant gas is guided from the discharge pipe 24 to a refrigeration cycle device outside the closed case 2.

During such a compression operation, the blade 16 receives a force to move in the direction of the suction portion S or the discharge portion D due to pressure balance or the like. The blade stopper 21a or 21b provided in this way comes into contact with and is stopped, so that there is no movement in any direction. Therefore, only the protruding / retracting movement in the spiral groove 15 is performed smoothly, and high compression efficiency is maintained. For example, at the time of startup, the pressure balance applied to both ends of the rotor piston 12 is lost, and the piston 1
2 may move axially with respect to the cylinder 5.

At this time, the blade stopper grooves 20A and 20B provided integrally with the piston 12 and inserted by the blade stoppers 21a and 21b move at the same time. The piston stopper 12 is formed as large as possible in the axial direction and penetrates from both end faces.
a, 21b never contact the ends of the grooves 20A, 20B.

That is, even when the piston 12 moves in the axial direction such as at the time of starting, the blade stoppers 21a and 21b are closed.
At a position where it does not contact the groove for groove stopper 20A, 20B
Since the blade stoppers 21a, 21b and the blade stopper grooves 20A, 20B do not collide with each other, generation of abnormal noise can be prevented and comfortable driving can be obtained.

In the above embodiment, the blade stopper grooves 20A and 20B of the suction portion S and the discharge portion D are also provided so as to extend through the end surface of the body portion 12a of the piston 12, but the invention is not limited to this. is not.

For example, by setting the pressure balance between both ends of the piston 12 so that the piston always moves in only one direction from the time of design, the blade stopper groove in this moving direction is configured as described above. There is no problem even if the other groove is left in the same state as the conventional one.

Further, the blade stopper groove 2
Both 0A and 20B may be ordinary long holes extending to the end face of the body portion 12a. In short, even if the piston 12 moves in the axial direction, the blade stoppers 21a and 21b The blade stopper grooves 20A and 20B may have a position where they do not come into contact with each other and have a full length.

The compressor of the present invention is not limited to use in a refrigeration cycle apparatus, but can be applied to a compressor for other uses. Various modifications can be made without departing from the scope of the present invention.

[0050]

As described above, according to the present invention, the blade stopper is provided at the suction part and the discharge part of the cylinder,
An end of the blade stopper is inserted into the suction part and the discharge part of the rotating body, and a concave groove communicating with the end of the spiral groove is provided. At least one of these concave grooves is axially oriented.
And the blade strike
Even if the rotating body moves in the axial direction, the
Since it is provided at a position where the blade stopper is not provided, it is possible to prevent the collision of the blade stopper with the blade stopper groove and the generation of abnormal noise, thereby enabling a quiet operation and improving reliability.

[Brief description of the drawings]

FIG. 1A is a front view of a piston showing one embodiment of the present invention. (B) is a longitudinal sectional view of the piston on the suction portion side of the piston. (C) is a longitudinal cross-sectional view of the piston on the discharge section side of the piston.

FIG. 2 is a vertical sectional side view of the fluid compressor of the embodiment.

FIG. 3 is an exploded perspective view of a sub bearing, a centering mechanism, and a support plate, showing another embodiment.

FIG. 4 is a perspective view of a support plate showing still another embodiment.

FIG. 5 is a front view of a piston showing a conventional example.

[Explanation of symbols]

5: cylinder, 16: blade, 15: spiral groove, 12
... Rotating body (rotor piston), S ... Suction part, D ... Discharge part, 21a, 21b ... Blade stopper, 20A, 20
B: concave groove (blade stopper groove).

Continuation of the front page (56) References JP-A-3-233182 (JP, A) JP-A-2-176188 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18 / 344 311 F04C 18/107

Claims (1)

(57) [Claims] A rotator having a helical groove in which a blade is removably inserted into a cylinder is eccentrically arranged, and the rotator and the cylinder are rotated relative to each other, so that fluid is transferred to the shaft of the cylinder. In the fluid compressor, which compresses while gradually transferring from the suction part located at one end to the discharge part located at the other end, the suction part and the discharge part of the cylinder move toward the end of the spiral groove of the blade. A blade stopper is provided for regulating the position of the blade. An end of the blade stopper is inserted into the suction part and the discharge part of the rotating body, and a concave groove communicating with the end of the spiral groove is provided. At least one is in the axial direction
It is formed into a long slot and the blade stopper
Does not come into contact with the recess even if the rotating body moves in the axial direction
A fluid compressor characterized by being provided at a position .