JPH10274184A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor to correct an oblique attitude to a correct attitude during initial operation, even when oblique assembly is effected, without changing the spring constant of a coil spring and ensure assembly precision and improve reliability. SOLUTION: A rotary compressor is formed such that one end part of a coil spring 15 is contained in the lateral hole 16 of a cylinder 2, the other end part is fitted in a blade 14, the blade 14 is elastically energized and pressed against the outer peripheral wall of a roller 13 to effect eccentric rotation in the cylinder 2, and the blade 14 is brought into reciprocating slide contact with a roller 13. The coil spring 15 winds the end part on the side, contained in the lateral hole 16, in an adhesion state and the adhesion length of the adhesion winding part is increased to a value higher than the containing length of the lateral hole 16. A size difference between the overall length Lb in a maximum shrinkage state, of a coil spring 15 at a top dead center position where the blade 14 effects most backward movement and the overall length Lc in a state that the whole of the coil spring 15 is completely adhered is set to approximately 1 mm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor constituting a refrigeration cycle of an air conditioner, for example.
The present invention relates to an improvement in a coil spring that elastically presses a blade against a roller that rotates eccentrically.

[0002]

2. Description of the Related Art In a rotary compressor used in an air conditioner, for example, a roller is driven eccentrically in a cylinder, while a blade projects into the cylinder and slides on the roller peripheral surface.

The blade reciprocates with the eccentric rotation of the roller, since the blade is elastically pressed and urged by the coil spring. Therefore, the blade always bisects the inside of the cylinder, and separates the suction part formed on one side from the discharge part formed on the other side.

[0004] With the eccentric rotation of the roller, gas is sucked into the cylinder from the suction part, and is guided to the discharge part side, and compression is performed by gradually reducing the cylinder internal volume. .

[0005]

Conventionally, as shown in FIG. 5, the above-described coil spring P is constituted. FIG. 3 shows a free length state of the coil spring P. A cylinder 2 is fitted to the inner peripheral wall of the closed case 1, and a lateral hole 3 as a storage portion is provided from the inner peripheral wall to the outer peripheral wall of the cylinder 2. Accordingly, the open end of the outer peripheral wall of the cylinder 2 of the lateral hole 3 is closed by the closed case 1.

[0006] One end of the coil spring P is housed in the side hole 3, and most of the other end protrudes from the cylinder side hole. The end of the coil spring P that is housed in the lateral hole 3 is wound in a tight state for one to two turns from the end face.

The diameter of the tightly wound portion Pa is larger than that of the other portion, and is slightly larger than the diameter of the lateral hole 3. For this reason, the tightly wound portion Pa is inserted into the lateral hole 3 in a light press-fit state.

Except for the tightly wound portion Pa, it is wound at a predetermined interval, and the other end abuts against a blade (not shown) for reciprocating the blade with the eccentric rotation of the roller. It forms the operating part Pb. A part of the operating part Pb is always located in the lateral hole 3.

The coil spring P constructed as described above has the following problems. That is, when assembling the compression mechanism, there is a work of incorporating the end of the coil spring P into the lateral hole 3. As described above, the tightly wound portion Pa, which is the end of the coil spring P, is press-fitted into the horizontal hole 3. At this time, the tightly wound portion Pa may be pushed in a state inclined with respect to the central axis of the horizontal hole 3.

When the blade is pressed and biased in such a state that the center axis of the coil spring P is inclined and inclined, the biased elastic force is applied to the blade, and the smooth operation of the blade is hindered. This leads to a reduction in compression efficiency.

Further, since a part of the operating portion Pb is located in the lateral hole 3, the operating portion Pb in the lateral hole 3 easily comes into contact with the peripheral wall of the lateral hole 3 as the coil spring P expands and contracts. Wear occurs and eventually leads to breakage.

In order to solve this kind of problem, the spring constant of the coil spring P is increased, and a pressing force is applied to the coil spring P using the moving force of the blade at the time of the initial operation. It is conceivable to correct the built-in condition.

That is, when the roller pushes the blade in the first rotation of the initial operation and the blade comes to the position where it is pushed most, the coil spring contracts most at the so-called top dead center position.

At this time, if the spring constant of the coil spring P is increased, the coil spring P is deformed by its own elastic force so that the inclination is eliminated, and should be changed to a normal posture. However, if the spring constant of the coil spring P is set to be large, there are disadvantages such as an increase in the load of the blade in sliding contact with the roller, an increase in loss, and an accelerated wear of the blade.

The present invention has been made based on the above circumstances, and an object of the present invention is to assume that the spring constant of a coil spring for elastically pressing and energizing a blade is not changed, and that the present invention is not limited to a case in which a cylinder housing is provided. It is an object of the present invention to provide a rotary compressor which can correct the posture at the time of initial operation even if it is installed diagonally, and can assure assembly accuracy and improve reliability.

[0016]

In order to satisfy the above object, a rotary compressor according to the present invention is characterized in that one end of the rotary compressor is housed in a housing provided in a cylinder, and the other end is housed in a blade. In a rotary compressor having a coil spring that is fitted and elastically presses and biases the blade to slidably contact the outer peripheral wall of a roller that rotates eccentrically in the cylinder, the coil spring includes: A tightly wound portion is formed by tightly winding an end of the side to be stored in the storage portion, and the entire length of the closely wound portion is set to be larger than the storage length of the storage portion, and the blade is most retracted. The dimensional difference between the maximum contracted full length Lb of the coil spring at the top dead center position and the total length Lc of the coil spring in a state where the entire coil spring is completely adhered is set to approximately 1 mm or less. To.

According to a second aspect, in the rotary compressor according to the first aspect, the tightly wound portion of the coil spring is formed in a tapered shape. Claim 3
According to a first aspect of the present invention, in the rotary compressor according to the first aspect, the storage portion provided in the cylinder has a surface accuracy of a peripheral surface of Rz25 or less.

By adopting the means for solving the above-mentioned problems, in the rotary compressor according to any one of claims 1 to 3, even if the coil spring is obliquely installed in the cylinder housing portion, the blade during the initial operation can be used. The coil spring is corrected to the correct posture by itself at the top dead center position where is pressed most. In addition, the coil spring does not come into contact with the storage portion, thereby preventing the coil spring from being damaged.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 shows a part of a rotary compressor. In the figure, reference numeral 1 denotes a closed case. Sealed case 1
A rotary compression mechanism 4 is provided in a lower part of the inside, and a motor part 5 is provided in the upper part. These compression mechanisms 4
The motor unit 5 is connected to the motor unit 5 via a rotating shaft 6, and the electric compressor main body 7 is constituted by these components.

The motor unit 5 is provided with a stator 8 fitted and fixed to the inner peripheral wall of the sealed case 1, a predetermined gap is provided inside the stator 8, and is fitted to the rotary shaft 6. And a rotor 9.

The compression mechanism 4 includes the cylinder 2 below the rotating shaft 6. A main bearing 10 is attached and fixed to an upper surface of the cylinder 2, and a sub bearing 11 is attached and fixed to a lower surface thereof. A cylinder chamber 12 is formed in a space surrounded by the cylinder 2, the main bearing 10 and the sub-bearing 11.

An eccentric portion 6a provided integrally with the rotary shaft 6 and a roller 13 fitted on the peripheral surface of the eccentric portion 6a are arranged in the cylinder chamber 12. The thickness of the roller 13 along the circumferential direction is all the same, and the roller 13 rotates eccentrically with the eccentric portion 6 a with the rotation of the rotating shaft 6.

A part of the outer peripheral wall along the axial direction of the roller 13 is always in line contact with the inner peripheral wall of the cylinder 2. Displaces gradually along the direction.

A blade 14 contacts the outer peripheral wall of the roller 13 along the axial direction. That is, one end of the blade 14 is elastically pressed and urged by the coil spring 15 described later, and the other end of the blade 14 is in elastic contact with the peripheral surface of the roller 13.

The blade 14 protrudes into the cylinder chamber 12 and partitions the cylinder chamber 12 into a discharge section 17 provided in the main bearing 10 and a suction section (not shown here) connected to the cylinder 2. I have.

Next, the coil spring 15 will be described in detail. The coil spring 15 is configured as shown in FIG. FIG. 3 shows a free length state of the coil spring 15.

The cylinder 2 is fitted to the inner peripheral wall of the closed case 1, and a lateral hole 16 as a storage portion is provided from the inner peripheral wall to the outer peripheral wall of the cylinder 2. The surface accuracy of the peripheral surface of the lateral hole 16 is finished to an extremely smooth state of Rz 25 or less (surface roughness by a 10-point averaging method according to JIS standard).

The open end of the lateral hole 16 on the outer peripheral wall side of the cylinder 2 is closed by the closed case 1, and only the open end on the inner peripheral wall side is open. One end of the coil spring 15 is housed in the lateral hole 16, and most of the other end projects from the cylinder 2.

The end on the side accommodated in the lateral hole 16 is a tightly wound portion, and a tightly wound portion 15a is formed. The entire length La of the tightly wound portion 15a is equal to or greater than the thickness of the cylinder 2, and a part of the tightly wound portion 15a protrudes from the lateral hole 16.

The end of the tightly wound portion 15a is in close contact with the inner peripheral wall of the closed case 1, and the outer diameter is formed larger than the diameter of the side hole 16 for about two turns from the end face. Is inserted with a light press fit.

The tightly wound portion 15a is formed in a tapered shape in which the diameter gradually decreases from the end face to the protruding portion of the lateral hole 16. Therefore, the tightly wound portion 1
5a is hardly deviated in the radial direction, and even if it is deviated, it is formed in a tapered shape, so that it does not contact the peripheral surface of the lateral hole 16.

The portion other than the tightly wound portion 15a is wound at a predetermined interval. This other end is the blade 1
An operating section 15b which contacts the roller 4 and reciprocates the blade 14 with the eccentric rotation of the roller 13.

FIG. 2 shows a state of the coil spring 15 when the blade 14 moves to a so-called top dead center position where the blade 14 reciprocates and retreats most. That is, while the springs are always in close contact with each other in the tightly wound portion 15a, there is a very small gap between the springs in the operating portion 15b.

The maximum total contraction length of the coil spring 15 when the blade 14 is at the top dead center position is defined as Lb. On the other hand, as shown in FIG. 3, regardless of the movement of the blade 14, the entire coil spring 15 is brought into close contact. The total length of the coil spring 15 in this state is L
c.

In the present invention, the maximum contraction full length Lb of the coil spring 15 at the position of the top dead center of the blade 14 is represented by:
The dimensional difference from the total length Lc of the coil spring in a state where the entire coil spring 15 is in close contact is set to be about 1 mm or less.

Then, the electric power is supplied to the motor unit 5 so that the rotating shaft 6
, The roller 13 rotates eccentrically together with the eccentric portion 6 a in the cylinder chamber 12. Blade 14
Is pressed and urged by the coil spring 15, and the cylinder chamber 1
2 and reciprocate while sliding on the peripheral surface of the roller 13.

Low pressure refrigerant gas is sucked into the cylinder chamber 12 from the suction portion, and the volume of the cylinder chamber 12 gradually decreases with the eccentric rotation of the roller 13 to perform compression. The gas rises to a predetermined pressure in a state where the volume of the cylinder chamber 12 is reduced most, and is discharged from the discharge unit 17.

The operating portion 15b of the coil spring 15, which substantially presses and biases the blade 14 elastically, protrudes from the lateral hole 16 so that it does not come into contact with the peripheral surface of the lateral hole 16. Therefore, wear and breakage of the coil spring 15 can be prevented.

Further, since the contact winding portion 15a is formed in a tapered shape, the contact winding portion 15a does not come into contact with the peripheral surface of the lateral hole 16, so that the coil spring 15 is prevented from being worn or damaged. Can be prevented.

At the time of assembling the compression mechanism 4,
There is an operation of incorporating the coil spring 15 into the lateral hole 16 of the cylinder 2. At this time, the coil spring 15 is inserted into the lateral hole 16 with the tightly wound portion 15a of the coil spring 15 first.

The outer diameter of the end of the coil spring contact winding portion 15a is formed to be larger than the diameter of the horizontal hole 16 by about 0.2 to 0.5 mm.
6 will be assembled in a light press-fit state.

Since the installation state of the coil spring 15 cannot be checked from the outside, the coil spring 15 may be installed obliquely with respect to the center axis of the lateral hole 16 as in the prior art.

However, since the dimensional difference between the maximum contracted full length Lb of the coil spring 15 at the top dead center position of the blade 14 and the total length Lc of the coil spring 15 in a state where the coil spring 15 is completely adhered is set to 1 mm or less, the initial operation is not performed. If the blade 14 reaches the top dead center position in the first rotation, the blade 14
As a result, the coil spring 15 is compressed so as to be in a state close to almost full contact.

That is, not only the operating portion 15b is simply compressed and deformed, but also the tightly wound portion 15b receives a pressing force. If the coil spring 15 is installed in a normal posture, the operating portion 15b is simply compressed and deformed, and the end surface of the tightly wound portion 15b is received by the inner peripheral wall of the closed case 1.

However, because of the oblique assembly, there is an oblique gap between the end face of the tightly wound portion 15a and the inner peripheral wall of the closed case 1. Therefore, the operating unit 15b
The tightly wound portion 15a which receives the pressing force via the protrudes into the gap with the inner peripheral wall of the closed case 1, and its end face moves so as to be completely in contact with the inner wall of the closed case.

Further, as described above, the peripheral surface of the horizontal hole 16 is smooth finished with Rz of 25 or less (surface roughness by a 10-point average method according to JIS standard).
The movement of a in the lateral hole 16 is performed smoothly, and its end face is completely in close contact with the inner peripheral wall of the sealed case.

In this way, even if the coil spring 15 is installed obliquely to the lateral hole 16, the installation posture of the coil spring 15 is automatically corrected by the blade 14 at the first rotation of the initial operation, and the normal operation is immediately performed. In the state of.

[0048]

As described above, according to the present invention, even if the coil spring is installed obliquely in the cylinder housing without changing the spring constant of the coil spring that elastically presses and biases the blade, It is possible to correct the posture to the correct posture in the first rotation of the operation, to solve the problems such as breakage of the coil spring, to obtain the assembling accuracy, and to improve the reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a part of a rotary compressor, showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a maximum contraction state of a coil spring at a top dead center position of a blade according to the embodiment.

FIG. 3 is an explanatory view of the coil spring in the same embodiment in a state of full contact.

FIG. 4 is an explanatory diagram of a free length state of the coil spring according to the embodiment.

FIG. 5 is an explanatory view of a conventional free length state of a coil spring.

[Explanation of symbols]

 2. Cylinder, 16: Storage part (lateral hole), 14: Blade, 13: Roller, 15: Coil spring, 15a: Closely wound part, 15b: Working part.

Claims (3)

[Claims] An end of the roller is housed in a housing portion provided in a cylinder, and the other end is fitted to a blade. The blade is elastically pressed and urged to rotate eccentrically in the cylinder. In a rotary compressor provided with a coil spring that slides reciprocally on a wall, the coil spring has a tightly wound portion in which an end on a side to be housed in the housing is tightly wound. The total length of the tightly wound portion is set to be larger than the storage length of the storage portion, and the maximum contraction full length Lb of the coil spring at the top dead center position when the blade is most retracted is completely adhered to the entire coil spring. Wherein the dimensional difference from the total length Lc in the closed state is set to approximately 1 mm or less. 2. A rotary compressor according to claim 1, wherein said coil spring has a tightly wound portion formed in a tapered shape. 3. The rotary compressor according to claim 1, wherein said storage portion provided on said cylinder has a surface accuracy of a peripheral surface of Rz 25 or less.