JP2013213477A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-efficient rotary compressor that reduces a slide loss between vanes.SOLUTION: In a thin structure, notched grooves A24 and B25 are provided, respectively, in the vicinity of a low-pressure chamber 13a side cylinder 8 inner circumferential surface and a high-pressure chamber 13b side cylinder outer circumferential surface in a wall surface of a vane groove 9 provided in a cylinder. Accordingly, a slide loss generated by a rotation direction load transmitted from a roller 7 to a vane 10 due to rotation movement of a crankshaft 6 is alleviated, so that a compression mechanism part of a high-performance rotary compressor is obtained.

Description

  The present invention relates to the structure of a compression mechanism portion of a rotary compressor used in an air conditioner, a refrigerator, a hot water heater and the like.

  Conventionally, a compression mechanism of this type of rotary compressor is provided with a roller driven through a crankshaft in a cylinder, and a vane accommodated in a vane groove provided in the cylinder so as to be slidable back and forth against the roller. The structure is such that a compression mechanism is formed in contact (see, for example, Patent Document 1).

  FIG. 2 is a longitudinal sectional view of a conventional rotary compressor, and FIG. 3 is an enlarged transverse sectional view of a compression mechanism portion in FIG.

  As shown in FIGS. 2 and 3, in the compression mechanism portion of the conventional rotary compressor, the stator 4 of the electric motor unit 3 that drives the compression mechanism unit 2 is shrink-fitted and fixed inside the sealed container 1. 3 is fixed to the crankshaft 6 that drives the compression mechanism 2 by shrink fitting. The crankshaft 6 includes a main shaft 6a, a subshaft 6b, and an eccentric shaft 6c. The compression mechanism of the compression mechanism section 2 is a roller 7 that is driven via the eccentric shaft 6c of the crankshaft 6, and a cylinder that houses the roller 7. A cylinder 8 containing a cylindrical cylinder, a vane 10 that abuts against a roller 7 to partition a compression chamber and reciprocate a vane groove 9 provided in the cylinder 8, and both end faces of the cylinder 8 are fixedly sealed. The main bearing 11 and the sub-bearing 12 also have the bearing function of the crankshaft 6.

  The compression chamber 13 configured in the cylinder 8 is partitioned into a low-pressure chamber 13a and a high-pressure chamber 13b by the roller 7 and the vane 10 that is constantly pressed against the roller 7 by a spring 14. The cylinder 8 has a suction hole 15 and a discharge hole 16, and the suction hole 15 is connected to a refrigeration cycle via a suction connection pipe 17 and an accumulator 18 provided outside the sealed container 1, and the discharge hole 16 is a discharge valve. 19, a valve stop 20 and a valve fixing bolt 21 are attached to the inside of the sealed container 1 through these. In addition, a lubricating oil 23 for lubricating the inside of the compression mechanism 2 and performing an oil seal is sealed in the lower part of the sealed container 1.

  The compression process of the compression mechanism part 2 of the rotary compressor comprised as mentioned above is demonstrated. The low-temperature and low-pressure refrigerant gas is guided from the outside of the sealed container 1 to the suction hole 15 and reaches the compression chamber 13 in the cylinder 8. The refrigerant gas reaching the compression chamber 13 is continuously sent from the suction hole 15 to the discharge hole 16 while being gradually compressed through the roller 7 by the rotational motion of the crankshaft 6 accompanying the rotation of the rotor 5 of the motor unit 3. . The compressed refrigerant gas is discharged through the discharge hole 16 and the discharge valve 19. The discharged high-temperature and high-pressure refrigerant gas fills the inside of the sealed container 1 and is guided to the refrigeration cycle outside the sealed container 1 through the discharge pipe 22.

The following load acts on the vane 10 in this compression process. First, a load F1 due to a differential pressure between the high-pressure chamber 13b and the low-pressure chamber 13a acts as a side load, and in the sliding direction of the vane 10, the inside of the sealed container 1 filled with the spring 14 by the spring 14 and the discharged gas refrigerant The load F2 due to the pressure and the pressure difference between the low pressure chamber 13a and the high pressure chamber 13b acts. As a result, the vane 10 receives the reaction force F3 by the roller 7 and also receives the reaction forces F4 and F5 at the two contact points 9a and 9b of the vane 10 and the vane groove portion 9, respectively. Here, the reaction forces F4 and F5 are loads generated by the resultant force of the component force F3a perpendicular to the sliding direction of the vane 10 of the load F1 and the reaction force F3. Therefore, with the reciprocating sliding movement of the vane 10, the frictional forces F6 and F7 act on the application points of the loads F4 and F5. As a result, the component force F3b and the frictional forces F6 and F7 in the sliding direction of the loads F2 and F3 are balanced against the sliding direction of the vane 10.

JP-A-2-215986

  However, in the conventional configuration, the sliding contact between the vane 10 and the vane groove portion 9 provided in the cylinder 8 is a sliding slide between metals, so the friction coefficient increases, and the frictional forces F6 and F7 are large. As a result, there has been a problem that in the compression mechanism portion 2, mechanical efficiency is lowered due to an increase in sliding loss in the vane groove portion 9.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a rotary compressor having high mechanical efficiency by reducing the above-described sliding loss.

  In order to solve the above-described conventional problems, the rotary compressor according to the present invention includes a vane in the vicinity of the inner peripheral surface of the low pressure chamber and the outer peripheral surface of the high pressure chamber inside the wall surface of the vane groove provided in the cylinder. And a notch groove for absorbing the load generated at the contact point between the vane groove and the thin wall structure.

  As a result, when the vane reciprocally slides in the compression process and a load is applied to the vane groove, the portion in the vicinity of the contact point in the vane groove is elastically deformed, the contact sliding load is relaxed, and the compression mechanism section Mechanical efficiency can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary compressor which improved the mechanical efficiency can be provided.

1 is a cross-sectional view showing a compression mechanism portion of a rotary compressor in Embodiment 1 of the present invention Conventional and longitudinal sectional views of the rotary compressor of the present invention Cross section showing the compression mechanism of a conventional rotary compressor

  According to a first aspect of the present invention, a cylinder, a main bearing and a sub-bearing fixed to both end faces of the cylinder, a roller that rotates in the cylinder, an electric motor unit that rotates and rotates the roller, and a contact with the roller are provided. The vane groove part provided in the cylinder is reciprocated in contact with the rotation of the roller in contact with each other, thereby having a vane that partitions the inside of the cylinder into a low pressure chamber and a high pressure chamber, and inside the wall surface of the vane groove part, the low pressure A slit is provided in the vicinity of the inner peripheral surface of the cylinder on the chamber side and in the vicinity of the outer peripheral surface side of the cylinder on the high pressure chamber side, and the vane slides back and forth in the compression process to load the vane groove. When is added, the portion near the contact point in the vane groove is elastically deformed, and the contact sliding load is relaxed, and the mechanical efficiency of the compression mechanism portion can be improved.

According to a second invention, in the first invention, a notch groove provided in the vicinity of the inner peripheral surface of the cylinder is provided in the axial direction with respect to the cylindrical inner diameter of the cylinder, and a suction hole provided in the cylinder is provided in the cylinder shaft. It has a rectangular shape in the direction, and the suction start position can be closer to the vane and the vane groove as a suction hole having a cross-sectional area equal to or larger than that of the conventional circular suction hole, and the confining volume is increased to increase the capacity. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, in order to avoid duplication of description, about the same part as a prior art example, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a compression mechanism portion of a rotary compressor according to a first embodiment of the present invention.

  In FIG. 1, the cylinder 8 has a vane groove portion 9 as in the prior art, and a compression chamber 13 is partitioned by a roller 7 and a vane 10 into a low pressure chamber 13a and a high pressure chamber 13b. Further, in the wall surface of the vane groove portion 9, a thin-walled structure is provided in which cut grooves A24 and B25 are provided in the vicinity of the inner periphery of the cylinder 8 on the low pressure chamber 13a side and in the vicinity of the outer periphery of the cylinder 8 on the high pressure chamber 13b side. .

  The operation and effect of the compression mechanism portion of the rotary compressor configured as described above will be described below.

  First, as in the conventional case, the refrigerant sucked from the refrigeration cycle with the rotation of the crankshaft 6 reaches the compression chamber 13 through the suction hole 15 and is compressed as described above into the sealed container 1 through the discharge hole 16. After being discharged, the discharge pipe 22 leads to the external refrigeration cycle. By this compression step, reaction forces F4 and F5 are applied at contact points 9a and 9b between the vane 10 and the vane groove portion 9 of the cylinder 8 as in the prior art.

  However, since the slits A24 and B25 are elastically deformed with the reciprocating sliding movement of the vane 10 unlike the conventional case, the friction coefficient with the vane groove portion 9 is lower than that of the reciprocating sliding sliding between the metals, and the friction force F8, F9 can be made smaller than the conventional frictional forces F6 and F7. Accordingly, it is possible to reduce the frictional force generated at the contact points 9a and 9b of the vane groove portion 9 which has caused the sliding loss, and as a result, the compression mechanism portion having less sliding loss and excellent mechanical efficiency. Can provide.

  In the present embodiment, since the cut groove A24 provided in the vicinity of the inner diameter of the cylinder 8 is provided in the axial direction with respect to the cylindrical inner diameter of the cylinder 8, the suction hole 15 that has been mainly circular in cross section in the past is provided. A rectangular shape with an equivalent cross-sectional area or more can be formed. Therefore, in a compression chamber configured with the same aspect ratio, the position where the roller 7 starts closing and compressing can be closer to the vane 10 and the vane groove 9, so that the confining volume can be increased. Can expand and have high capacity.

  As described above, since the rotary compressor according to the present invention can reduce sliding loss due to the load applied from the vane to the vane groove during the compression process, in addition to the compressor, for example, a pump device such as a vacuum pump or an oil pump, It can also be applied to applications such as expanders and vane rotary type compressors.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Electric motor part 4 Stator 5 Rotor 6 Crankshaft 6a Main shaft 6b Subshaft 6c Eccentric shaft 7 Roller 8 Cylinder 9 Vane groove 9a Contact point 9b Contact point 10 Vane 11 Main bearing 12 Sub bearing 13 Compression Chamber 13a Low pressure chamber 13b High pressure chamber 14 Spring 15 Suction hole 16 Discharge hole 17 Suction connection pipe 18 Accumulator 19 Discharge valve 20 Valve stop 21 Valve fixing bolt 22 Discharge pipe 23 Lubricating oil 24 Cut groove A

Claims (2)

A cylinder, a main bearing and a sub-bearing fixed to both end faces of the cylinder, a roller that rotates in the cylinder, an electric motor unit that applies rotation to the roller, and a rotation of the roller in contact with the roller Reciprocating the vane groove portion provided in the cylinder according to the above, thereby having a vane that divides the inside of the cylinder into a low pressure chamber and a high pressure chamber, and inside the wall surface of the vane groove portion, the cylinder on the low pressure chamber side is provided. A rotary compressor provided with cut grooves in the vicinity of the inner peripheral surface and in the vicinity of the outer peripheral surface side of the cylinder on the high pressure chamber side. The rotary according to claim 1, wherein a notch groove provided in the vicinity of the inner peripheral surface of the cylinder is provided in an axial direction with respect to a cylindrical inner diameter of the cylinder, and a suction hole provided in the cylinder is formed in a rectangular shape in the cylinder axial direction. Compressor.