JPH06307362A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the loss of the pipeline and improve the volumetric efficiency by forming end surfaces on the compression chamber side and the discharge valve side to be non-parallel to each other to reduce the length of the discharge hole forming pipe so as to reduce the volume of the discharge hole in a discharge hole forming pipe which is formed in a bearing of a compression mechanism part. CONSTITUTION:A motor part 1 are connected to a compression mechanism part 2 by a crankshaft 3, and they are stored in an enclosed container 13. In the compression mechanism part 2, a rolling piston 5 connected to the crankshaft 4 is stored in the cylinder 4, and the vanes 6 are reciprocated following this rotation, and at the same time, both ends of the cylinder 4 are enclosed at the main and sub bearings 7, 8, and the crankshaft 3 is supported thereby. In addition, a discharge chamber 14 and a discharge hole forming tube 18 are formed in the sub bearing 8. The discharge hole forming tube 18 forms the end surface 20 on the compression chamber side non-parallel to the end surface 19 on the discharge valve side. That means, the end surface 19 is inclined to the end surface 20. This constitution reduce the length of the discharge hole forming tube 18, and reduce the volume of the discharge hole 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor mainly used for air conditioning and refrigeration, and more particularly to a rotary compressor effective for improving the efficiency of the compressor.

[0002]

2. Description of the Related Art A conventional rotary compressor will be described with reference to FIGS.

FIG. 6 is a vertical sectional view of a conventional rotary compressor, and FIG. 7 is a sectional view of a main part of FIG. In this rotary compressor, an electric motor 1 including a rotor 1a and a stator 1b and a compression mechanism portion 2 are connected by a crankshaft 3 and housed in a hermetically sealed container 13.

The compression mechanism section 2 includes a cylinder 4 fixed to a closed container 13, a rolling piston 5 which is rotatably fitted to an eccentric portion 3a of a crankshaft 3 provided in the cylinder 4, and a rolling piston. 5, a reciprocating vane 6 and a main bearing 7 and a sub-bearing 8 that seal the both ends of the cylinder 4 and support the crankshaft 3, and the eccentric portion 3a of the crankshaft 3 has a rolling piston 5a. The rotary compressor has a pin portion 9 that abuts on the main bearing 7 and a thrust portion 10 that abuts on the auxiliary bearing 8.

The discharge chamber 14 is formed in the auxiliary bearing 8. A discharge chamber cover 15 is fastened to the auxiliary bearing 8. A discharge valve 16 and a discharge valve receiver 17 are installed in the discharge chamber 14 of the auxiliary bearing 8. Reference numeral 18 denotes a discharge hole forming pipe which is provided on the auxiliary bearing 8 and one of which is the discharge valve 16
Is formed in a circular shape toward, and the other communicates with the compression chamber 21.

In the conventional rotary compressor configured as described above, the pin portion 9 of the crankshaft 3 is eccentrically rotated by the driving force of the rotor 1a, and accordingly, the eccentric rotation of the rolling piston 5 is followed. The vane 6 makes a reciprocating motion, and the suction compression process is sequentially repeated to discharge the refrigerant gas into the discharge hole 2.
The discharge valve 16 is pushed open from 2 to discharge into the discharge chamber 14.

[0007]

In the above prior art, when the compressed refrigerant gas is discharged from the discharge hole 22, if the volume of the discharge hole increases, the compressed refrigerant gas remains without being discharged by the volume of the discharge hole. Losses increase because the residual refrigerant gas re-expands. If the volume of the discharge hole is reduced in order to reduce this re-expansion loss, there is a relation that the flow velocity of the compressed refrigerant gas flowing through the discharge hole is increased and the pipe line loss is increased. Is reduced,
There was a problem that the capacity of the compressor was reduced.

The object of the present invention is to reduce the above-mentioned problems of the prior art. The end face of the discharge hole forming pipe which is in contact with the discharge valve is the end face of the discharge hole forming pipe on the compression chamber side. By inclining, the length of the discharge hole forming pipe on the tip side of the discharge valve becomes shorter than before, and the volume of the discharge hole can be reduced accordingly, and further, when the compressed refrigerant gas is discharged from the discharge hole, An object of the present invention is to provide a rotary compressor in which the opening area of the end surface of the forming pipe which is in contact with the discharge valve is larger than in the conventional case, the pipe line loss can be reduced, and the volume efficiency is improved and the capacity of the compressor is improved. .

[0009]

In order to achieve the above object, a rotary compressor according to the present invention has a structure in which an electric motor and a compression mechanism are connected by a crankshaft and housed in a hermetic container. The compression mechanism section includes a cylinder fixed to a closed container, and a rolling piston that is rotatably fitted to an eccentric portion of a crankshaft provided in the cylinder.
Following the rotation of the rolling piston, a vane fitted into the cylinder vane slot portion and reciprocating, a main bearing for sealing the upper and lower ends of the cylinder and supporting the crankshaft, a sub-bearing, The eccentric part of the crankshaft has a pin part that comes into contact with the rolling piston,
The main bearing and the auxiliary bearing have a thrust portion, and a discharge hole forming pipe formed in the bearing, a discharge valve, and a discharge valve receiver are provided, and the main and auxiliary bearings are arranged in the cylinder for compression. In a rotary compressor having a chamber, the end face of the discharge hole forming pipe on the compression chamber side and the end face in contact with the discharge valve are provided so as not to be parallel to each other.

[0010]

The present invention comprises a main bearing and a sub bearing for sealing the upper and lower ends of the cylinder and supporting the crankshaft.
In a rotary compressor equipped with a discharge hole forming pipe formed in the bearing, a discharge valve, and a discharge valve receiver, the end face of the discharge hole forming pipe on the compression chamber side and the end face on the side in contact with the discharge valve are parallel to each other. This is done so that the volume of the discharge hole is reduced, and the pipe loss when the compressed refrigerant gas is discharged from the discharge hole is also reduced, improving the volumetric efficiency and the compressor performance. Can be improved.

[0011]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a plan view of an auxiliary bearing 8, and FIG. 3 is FIG.
Is a cross-sectional view taken along the line AA showing the main part, and FIGS. 4 and 5 are cross-sectional views showing the processed state of the main part.

The rotary compressor shown in FIG. 1 has a rotor 1a.
The electric motor 1 including the stator 1b and the compression mechanism portion 2 are connected by the crankshaft 3 and housed in the closed container 13. Refrigerating machine oil 12 is stored at the bottom of the compressor.

The compression mechanism section 2 includes a cylinder 4 fixed to a closed container 13, a rolling piston 5 rotatably fitted to an eccentric portion 3a of a crankshaft 3 provided in the cylinder 4, and a rolling piston. 5, a reciprocating vane 6 and a main bearing 7 and a sub-bearing 8 that seal the both ends of the cylinder 4 and support the crankshaft 3, and the eccentric portion 3a of the crankshaft 3 has a rolling piston 5a. The rotary compressor has a pin portion 9 that abuts on the main bearing 7 and a thrust portion 10 that abuts on the auxiliary bearing 8.

The discharge structure will be described with reference to FIGS.

The discharge chamber 14 is formed in the sub bearing 8. A discharge chamber cover 15 is fastened to the auxiliary bearing 8. A discharge valve 16 and a discharge valve receiver 17 are installed in the discharge chamber 14 of the auxiliary bearing 8. Reference numeral 18 denotes a discharge hole forming pipe which is provided on the auxiliary bearing 8 and one of which is the discharge valve 16
And the other communicates with the compression chamber 21. The discharge hole forming pipe 18 formed in the auxiliary bearing 8 is formed such that the end surface 20 on the compression chamber 21 side and the end surface 19 on the side in contact with the discharge valve 16 are not parallel.

The processing state will be described with reference to FIGS.

In FIG. 4, the end face 19 of the discharge hole forming pipe 18 which is in contact with the discharge valve 16 is inclined with respect to the end face 20 of the discharge hole forming pipe 18 on the compression chamber 21 side. The side of the discharge hole forming tube 18 has the shortest length dimension on the side 16a, and the discharge hole forming tube 18 is further sub-bearing so that its axial center is substantially perpendicular to the cylinder 4 contact surface of the sub bearing 8. 8, the discharge valve 16 of the discharge hole forming pipe 18
The end face 1 on the side in contact with is formed as an oval hole, and the end face 20 on the compression chamber side of the discharge hole forming tube is formed as a circular hole.

In FIG. 5, the discharge hole forming pipe 18 is attached to the auxiliary bearing 8 so that the axis of the discharge hole forming pipe 18 is inclined with respect to the contact surface of the cylinder 4 of the auxiliary bearing 8 and is discharged to the discharge valve tip side 16a. The end of the discharge hole forming tube 18 on the side in contact with the discharge valve 16 is a circular hole, and the end surface 20 of the discharge hole forming tube 18 on the compression chamber 21 side is long. It is formed to be a circular hole.

As described above, the discharge hole forming pipe 18 on the discharge valve tip side 16a is made shorter than the discharge hole forming pipe 18 on the discharge valve mounting side 16b, so that the discharge hole forming pipe 18 is discharged. The end surface 19 on the side in contact with the valve 16 has a shape inclined with respect to the end surface 20 of the discharge hole forming tube 18 on the compression chamber 21 side.

The rotary compressor having the above structure is
The pin portion 9 of the crankshaft 3 is eccentrically rotated by the driving force of the rotor 1a, and accordingly, the vane 6 reciprocates following the eccentric rotation of the rolling piston 5, and the suction compression process is sequentially continued. The refrigerant gas is repeatedly discharged into the discharge chamber 14 by pushing the discharge valve 16 open from the discharge hole 22.

According to this embodiment, the end surface 19 of the discharge hole forming tube 18 which is in contact with the discharge valve 16 is inclined with respect to the end surface 20 of the discharge hole forming tube 18 on the compression chamber 21 side.
By setting the length to 8, the length dimension of the discharge hole forming tube 18 on the discharge valve tip side 16a becomes shorter than in the conventional case, and the discharge hole 22 is correspondingly reduced.
When the compressed refrigerant gas is discharged from the discharge hole 22, the end surface 19 of the discharge hole forming tube 18 which is in contact with the discharge valve 16 has a compression chamber 21 side of the discharge hole forming tube 18. The discharge hole forming pipe 18 is inclined with respect to the end face 20.
The opening area on the side contacting the discharge valve 16 is larger than the opening area on the compression chamber side, and the line loss can be reduced.
The volumetric efficiency can be improved and the capacity of the compressor can be improved.

[0023]

According to the present invention, the discharge valve is formed by making the end surface of the discharge hole forming tube, which is in contact with the discharge valve, inclined with respect to the end surface of the discharge hole forming tube on the compression chamber side. The length of the discharge hole forming pipe on the tip side is shorter than in the past, and the volume of the discharge hole can be reduced by that amount. Further, when the compressed refrigerant gas is discharged from the discharge hole, it comes into contact with the discharge valve of the discharge hole forming pipe. Side end face is inclined with respect to the compression chamber side end face of the discharge hole forming pipe, the opening area of the discharge hole forming pipe on the side in contact with the discharge valve is larger than the opening area of the compression chamber side, and the pipeline loss is also reduced. Therefore, there is an effect that the volumetric efficiency is improved and the capacity of the compressor is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a plan view of a sub bearing of FIG.

3 is a cross-sectional view taken along the line AA showing the main part of FIG.

FIG. 4 is a cross-sectional view showing a processed state of a main part of FIG.

5 is a cross-sectional view showing a processed state of a main part of FIG.

FIG. 6 is a vertical sectional view of a conventional rotary compressor.

7 is a cross-sectional view showing a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric drive part, 2 ... Compression mechanism part, 3 ... Crank shaft, 4 ... Cylinder, 5 ... Rolling piston, 6 ... Vane, 7 ... Main bearing, 8 ... Sub bearing, 14 ... Discharge chamber, 15 ... Discharge chamber cover, 16 ... Discharge valve, 17 ... Discharge valve receiver, 18 ... Discharge hole forming pipe, 21 ... Compression chamber, 22 ... Discharge hole.

Claims (4)

[Claims] 1. An electric motor and a compression mechanism unit are connected by a crankshaft and housed in a closed container, wherein the compression mechanism unit is a cylinder and an eccentricity of the crankshaft provided in the cylinder. A rolling piston fitted to the
A vane that reciprocates following the rotation of the rolling piston, main and auxiliary bearings that seal both ends of the cylinder and support the crankshaft, a discharge hole forming pipe formed in the bearing, a discharge valve, A rotary compressor having a discharge valve receiver and having a main chamber and a sub-bearing inside the cylinder to form a compression chamber, in which the end face of the discharge hole forming tube on the compression chamber side contacts the discharge valve. A rotary compressor characterized in that the end faces are not parallel. 2. The discharge valve forming pipe on the discharge valve tip side is in contact with the discharge valve of the discharge hole forming pipe by making the discharge hole forming pipe length dimension shorter than the discharge valve mounting side discharge hole forming pipe length dimension. The end face on the side is inclined with respect to the end face on the compression chamber side of the discharge hole forming pipe, and the opening area of the discharge hole forming pipe on the side in contact with the discharge valve is larger than the opening area on the compression chamber side. Rotary compressor. 3. The discharge hole forming pipe according to claim 1, wherein an end face of the discharge hole forming pipe in contact with the discharge valve is inclined with respect to an end face of the discharge hole forming pipe on the compression chamber side. Make sure that the shortest length of the discharge hole forming pipe is on the valve tip side, and further install the discharge hole forming pipe on the bearing so that its axis is almost perpendicular to the cylinder contact surface of the bearing. A rotary compressor characterized in that an end surface of the forming tube on the side in contact with the discharge valve is formed into an oval hole, and an end surface of the discharge hole forming tube on the side of the compression chamber is formed into a circular hole. 4. The discharge hole forming pipe according to claim 1, wherein the discharge hole forming pipe is attached to the bearing such that an axis of the discharge hole forming pipe is inclined with respect to a cylinder contact surface of the bearing, and a discharge hole forming pipe is provided at a front end side of the discharge valve. The end face of the discharge hole forming pipe on the side in contact with the discharge valve is a circular hole, and the end face on the compression chamber side of the discharge hole forming pipe is an oval hole. Rotary compressor.