JPH1122678A - 2-cylinder rotary compressor - Google Patents

Abstract

(57) [Problem] A two-cylinder rotary compression system capable of pressing a vane against a piston with a relatively simple structure with a relatively simple structure without using an elastic member for pressing the vane against the piston. Machine. SOLUTION: In a two-cylinder rotary compressor, one ends of vanes 9a, 9b of each compression mechanism 3a, 3b are rotatably connected by a connecting member 14, and the connecting member 1
4 is provided with a support point 15 at the center in the axial height. As a result, the vane 9a (9b) of one compression mechanism 3a (3b) is pushed up by the eccentric rotational movement of the piston 10a (10b), so that the operation is performed via the connecting member 14 and the other compression mechanism. 3b (3a)
Push down the vane 9b (9a) of the
b (9a) is pressed against the piston 10b (10a). Therefore, the vanes 9a, 9b are connected to the pistons 10a, 10b.
b can be reliably pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-cylinder rotary compressor used for an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Utility Model Application Laid-Open No. 62-18
A two-cylinder rotary compressor disclosed in Japanese Patent Publication No. 6 will be described as an example with reference to the drawings.

[0003] In FIG. 4, an electric motor unit 102 and two compression mechanism units 103 a and 103 b installed in an axial direction via an intermediate partition plate 106 driven by the electric motor unit 102 are provided in a closed container 101. Two eccentric shaft portions 105 opposed to each other by 180 degrees for transmitting the rotational force of the electric motor portion 102 to these compression mechanism portions 103a and 103b.
a and 105b are installed.

Each of the compression mechanisms 103a and 103b has a cylinder 107a and 107b,
07a, 107b provided in the vane grooves 108a, 10b.
8b slidably mounted on vanes 109a, 109b
And the eccentric shaft portions 105a and 105 of the crankshaft 104.
b, the pistons 110a rotatably fitted and installed.
110b.

The main bearings 111 of the crankshaft 104 are provided at both axial ends of each of the compression mechanisms 103a and 103b.
And an auxiliary bearing 112 are provided.

Further, elastic members 113a and 113b are provided at one ends of the vanes 109a and 109b, and the force is applied to the vanes 109a and 109b by the pistons 11a and 109b, respectively.
It acts so as to press against the outer periphery of 0a, 110b. The inside of the cylinders 107a and 107b is partitioned into a suction chamber side space and a discharge chamber side space.

With the above configuration, when the electric motor unit 102 is driven, the two eccentric shaft portions 105a, 105 whose rotational forces are opposed to each other by 180 degrees via the crankshaft 104.
05b, so that each of the pistons 110a, 1
10b performs eccentric rotational movement in the cylinders 107a and 107b.

As a result, the low-pressure refrigerant gas respectively sucked from the suction holes (not shown) is supplied to the pistons 110a and 110b.
Compressed with the eccentric rotational movement of the
And becomes a high-pressure refrigerant gas, which is once discharged into the closed vessel 101. This high-pressure refrigerant gas is supplied to the vane 109.
A force acting on one end of each of the pistons 110a and 110b acts on the outer periphery of each of the pistons 110a and 110b together with the force of the elastic members 113a and 113b.

Thereafter, the high-pressure refrigerant gas is discharged from the discharge pipe 114 to the outside of the closed vessel 101 through the gap of the electric motor 102.

[0010]

However, in the above conventional configuration, the vanes 109a and 109b are not
The forces pressed against 10a and 110b are vanes 1 respectively.
Elastic member 113 installed at one end of each of 09a and 109b
a, 113b and vanes 109a, 10
9b is the sum of the force due to the pressure of the high-pressure refrigerant gas acting on one end of the piston 9b, and the pressing force of the elastic members 113a and 113b causes the vanes 109a and 109b to reciprocate by the eccentric rotation of the pistons 110a and 110b. It moves and changes as the elastic members 113a and 113b themselves expand and contract.

The pistons 110a and 110b are cylinder 1
07a, 107b provided in the vane grooves 108a, 10b.
When the elastic members 113a and 113b are on the opposite side by 180 degrees from the angle in the direction 8b, the elastic members 113a and 113b are in the most extended state (hereinafter, this state is referred to as bottom dead center).
When the angles 0a and 110b become the angles in the direction of the vane grooves 108a and 108b, the elastic members 113a and 113b are in the most contracted state (hereinafter, this state is referred to as a top dead center).
Therefore, at the bottom dead center, the force with which the vanes 109a and 109b are pressed against the pistons 110a and 110b is the weakest, and conversely at the top dead center it is the strongest.

Note that the compression mechanism units 103a and 103b
Since the pistons 110a and 110b are rotatably fitted to the eccentric shaft portions 105a and 105b of the crankshaft 104 opposed to each other by 180 degrees, when one of the compression mechanisms is in the state of the top dead center, the other compression mechanism has Then, it is in the state of bottom dead center.

At one end of the vanes 109a and 109b, in addition to the force of the elastic members 113a and 113b, the force of the high-pressure refrigerant gas is applied to the pistons 110a and 11b.
It acts in the direction pressed against the outer periphery of Ob.

Due to the above-described structure, when the compressor is operated at an extremely high load, that is, when the difference between the pressure of the high-pressure refrigerant gas and the pressure of the low-pressure refrigerant gas is large, in the state of the top dead center, Vane 109a, 109b with very strong force
Is pressed against the pistons 110a and 110b. By continuing such an operation state, the vane 1
Abnormal wear of the tips of 09a and 109b proceeded abnormally, resulting in a decrease in reliability. In particular, in recent years, it has been known that in a compressor using an HFC-based refrigerant, which is being used in place of the conventional refrigerant, generally the sliding conditions are more severe, and the wear of the tips of the vanes 109a and 109b is reduced. It was one of the big issues.

Further, since the elastic members 113a and 113b are repeatedly expanded and contracted, there is a problem that if the elastic members 113a and 113b are not designed with a sufficient safety factor, they may be broken due to fatigue.

Further, when starting the compressor, a relatively large torque is required.
As disclosed in Japanese Patent No. 9788, the elastic member is installed only on the vane of one compression mechanism, not on the vane of the other compression mechanism, and the force due to the pressure of the high-pressure refrigerant gas inside the closed vessel is applied. There is a technique that reduces the starting torque by acting only on the starting torque. However, in such a method, when the pressure of the high-pressure refrigerant gas is small, the force with which the vane is pressed against the outer peripheral portion of the piston is too small, and as a result, the refrigerant gas leaks from between the vane and the piston, and is compressed. There was a risk that efficiency would be reduced.

The present invention has been made to solve the above-mentioned conventional problems, and has a relatively simple structure capable of pressing a vane against a piston with a certain and appropriate force.
An object of the present invention is to provide a cylinder rotary compressor.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, one end of each vane of each compression mechanism is rotatably connected by a connecting member, and the connecting member has an axial height center portion. Are provided with support points. By this connecting member, the vane of one compression mechanism is pushed up by the eccentric rotational movement of the piston rotatably fitted to the eccentric shaft of the crankshaft, so that the operation is performed via the connecting member by the other compression mechanism. Push down some vanes,
As a result, it is pressed against the piston. This not only eliminates the need for an elastic member for pressing the vane against the piston, but also allows the vane to be reliably and appropriately pressed against the piston.

[0019]

According to a first aspect of the present invention, there is provided a compression mechanism, wherein one end of a vane of each compression mechanism is rotatably connected by a connecting member, and the height of the connecting member in the axial direction is increased. A support point is provided at the center. And according to this structure, the vane of one compression mechanism part is
The piston is pushed up by the eccentric rotational movement of the piston rotatably fitted to the eccentric shaft portion of the crankshaft, and the operation is transmitted to a connecting member rotatably connected to one end of the vane. The connecting member is provided with a support point at the center in the axial height thereof, and the other end of the connecting member is rotatably connected to one end of the vane of the other compression mechanism. The operation of the member pushes down the vane of the other compression mechanism, so that the vane is pressed against the piston. Therefore, the vane can be reliably pressed against the piston.

According to a second aspect of the present invention, the connecting portion of the vane with the connecting member is formed as a spherical concave portion, and both ends of the connecting member are formed as spherical convex portions.

According to a third aspect of the present invention, one end of each of the vanes of each compression mechanism is connected to each other via an elastic member, and a support point is provided at a central portion in the axial height of the connecting member. . According to this configuration, in addition to the embodiment of the first aspect of the present invention, since one end of each vane and the connecting member are interposed by the elastic member, the rigidity of the elastic member is appropriately set. This allows the vane to be pressed against the piston with an optimal and constant force.

According to a fourth aspect of the present invention, the support point of the connecting member is provided on the intermediate partition plate.

According to a fifth aspect of the present invention, one end of each vane of each compression mechanism is rotatably connected by an arc-shaped connecting member, and a part of the connecting member is brought into contact with the inner wall of the sealed container. Things. According to this configuration, the vane of the one compression mechanism is pushed up by the eccentric rotational movement of the piston rotatably fitted to the eccentric shaft of the crankshaft, and the operation is rotatably connected to one end of the vane. To the arcuate connecting member. The other end of the arc-shaped connecting member is rotatably connected to one end of the vane of the other compression mechanism, and a part of the connecting member is in contact with the inner wall of the sealed container. The operation of the arcuate connecting member pushes down the vane of the other compression mechanism, so that the vane is pressed against the piston.

According to a sixth aspect of the present invention, the arc-shaped connecting member is an elastic member. According to this configuration, the vane is pressed against the piston with an optimal and constant force by appropriately setting the rigidity of the arc-shaped elastic member, as in the embodiment of the third aspect of the present invention. be able to.

[0025]

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

(Embodiment 1) In FIG. 1, two compression mechanism units installed in an axial direction via a motor unit 2 and an intermediate partition plate 6 driven by the motor unit 2 in a closed container 1. 3a, 3b and a crankshaft 4 having two eccentric shaft portions 5a, 5b opposed to each other by 180 degrees for transmitting the rotational force of the electric motor portion 2 to these compression mechanism portions 3a, 3b.
And is installed.

The compression mechanisms 3a and 3b are respectively provided with cylinders 7a and 7b and vanes 9 slidably mounted in vane grooves 8a and 8b provided in the cylinders 7a and 7b.
a, 9b, and pistons 10a, 10b rotatably fitted and installed on the eccentric shaft portions 5a, 5b of the crankshaft 4.
It is composed of

A main bearing 11 and a sub-bearing 12 of the crankshaft 4 are provided at both axial ends of each of the compression mechanisms 3a and 3b.

Further, concave portions 13a and 13b are provided at one end of the vanes 9a and 9b, and both ends 14a and 14b of the connecting member 14 are rotatably connected.
A support point 15 is provided at the center of the connecting member 14 in the axial height. The ends of the vanes 9a and 9b opposite to the ends where the recesses 13a and 13b are provided are respectively provided with pistons 10a and 9b.
a, 10b are in contact with the outer periphery of each cylinder 7a, 7b
The interior is partitioned into a suction chamber side space and a discharge chamber side space.

With the above configuration, when the electric motor unit 2 is driven, its rotational force is transmitted to the two eccentric shaft units 5a and 5b which are 180 degrees opposite to each other via the crankshaft 4,
As a result, each of the pistons 10a and 10b
An eccentric rotation is performed within a and 7b. As a result, the low-pressure refrigerant gas respectively sucked from the suction holes (not shown) is compressed by the eccentric rotation of the pistons 10a and 10b. Thereafter, the refrigerant gas compressed by the compression mechanism 3a is:
It becomes high-pressure refrigerant gas from a discharge hole (not shown),
It is discharged into the main shaft side discharge space 16. The compression mechanism 3
The refrigerant gas compressed in b is similarly turned into a high-pressure refrigerant gas from a discharge hole (not shown), and once becomes a sub-shaft side discharge section 17.
Is discharged to the main shaft side discharge space 16 through the communication hole 18. Thereafter, the gas is discharged from the annular gap 19 into the closed container 1, passes through the gap of the electric motor 2, and is discharged from the discharge pipe 20 to the outside of the closed container 1.

Further, as the pistons 10a, 10b make eccentric swiveling movements in the cylinders 7a, 7b, the vanes 9
a, 9b perform a reciprocating translational motion. One compression mechanism 3a
The vane 9a (9b) of (3b) is connected to the piston 10a (1
0b), the vane recess 13a
(13b), one end 14a of the connecting member 14 (14
The movement is transmitted to b). Since the supporting point 15 is provided at the center of the connecting member 14 in the axial height, the movement is performed via the other end 14b (14a) of the connecting member 14 and the vane of the other compression mechanism 3b (3a). The recess 13b (13
a) is transmitted to depress. As a result, the vane 9b (9a) is pushed down, and one end of the vane 9b (9a) is pressed against the piston 10b (10a). These operations are alternately repeated with the rotation of the crankshaft 4.

Accordingly, one of the pistons pushes up the vane, so that the other vane is reliably pushed to the piston via the connecting member. Therefore, an elastic member for pushing the vane against the piston as in the prior art is not required.
Also, there is no problem such as breakage of the elastic member.

The connecting portions 13a and 13b of the vanes 9a and 9b with the connecting member 14 are formed as spherical concave portions, and both ends 14a and 14b of the connecting member 14 are formed as spherical convex portions. It is possible to reduce the surface pressure at the connection portion of the connection member 14 and the connection member 14, and it is possible to suppress wear at this portion.

Further, by providing the support point 15 of the connecting member 14 at a part of the intermediate partition plate 6, it is not necessary to add a component for providing a separate support point.

(Embodiment 2) In the embodiment shown in FIG.
The same parts as those in the configuration shown in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In the figure, concave portions 13a, 13b are provided at one end of the vanes 9a, 9b.
a, 21b, both ends 14a, 1 of the connecting member 14
4b, and a fulcrum 15 is provided at the center of the connecting member 14 in the axial height.

With the above configuration, the pistons 10a, 10b
With the eccentric turning motion in the cylinders 7a and 7b,
The vanes 9a and 9b perform a reciprocating translation movement. The vane 9a (9b) of one compression mechanism 3a (3b)
When pushed up by Oa (10b), the movement is transmitted from the recess 13a (13b) of the vane to one end 14a (14b) of the connecting member 14 via the elastic member 21a (21b). Since the supporting point 15 is provided at the center in the axial height of the connecting member 14, the movement is
4 from the other end 14b (14a) of the elastic member 21b (21).
Via a), it is transmitted so as to push down the recess 13b (13a) of the vane of the other compression mechanism 3b (3a). As a result, the vane 9b (9a) is pushed down, and one end of the vane 9b (9a) is pressed against the piston 10b (10a). Also, with the rotation of the crankshaft 4,
These operations are repeated alternately.

Therefore, when one of the pistons pushes up the vane, the other vane is reliably pressed against the piston via the elastic member and the connecting member. In addition, since the displacement of the elastic member itself hardly changes and a constant force always acts, the vane is pressed against the piston with an optimal and constant force by appropriately setting the rigidity of the elastic member in advance. Can be.

Further, even if a gap between parts occurs due to a part tolerance, an assembly tolerance, or the like, the elastic member 2
Since they are absorbed by 1a and 21b, component processing or assembly becomes easy.

(Embodiment 3) In the embodiment shown in FIG.
The same parts as those in the configuration shown in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In the figure, concave portions 13a, 13b are provided at one end of the vanes 9a, 9b, and both ends of an arc-shaped connecting member 22 are rotatably connected.
A part of the connecting member 22 is in contact with the inner wall of the closed container 1.

With the above configuration, the pistons 10a, 10b
With the eccentric turning motion in the cylinders 7a and 7b,
The vanes 9a and 9b perform a reciprocating translation movement. The vane 9a (9b) of one compression mechanism 3a (3b)
When pushed up by 0a (10b), the movement is transmitted to one end of the arc-shaped connecting member 22 via the concave portion 13a (13b) of the vane. Since the vicinity of the center of the height of the connecting member 22 in the axial direction is in contact with the inner wall of the closed container 1, the movement is performed from the other end of the connecting member 22 to the concave portion 13b of the vane of the other compression mechanism 3b (3a). (13a) is transmitted so as to be depressed. As a result, the vane 9b (9
a) is pushed down, and one end of the vane 9b (9a) is pressed against the piston 10b (10a). These operations are alternately repeated with the rotation of the crankshaft 4.

Therefore, one of the pistons pushes the vane up, so that the other vane is securely pushed to the piston via the arcuate connecting member. Therefore, there is no need for an elastic member for pushing the vane against the piston as in the prior art. Becomes

Further, by making the arc-shaped connecting member 22 itself elastic, the vane can be pressed against the piston with an optimal and constant force. Further, even if gaps between components due to component tolerances or assembly tolerances are generated, they are absorbed by the elastic member 22, so that component processing or assembly becomes easy.

[0045]

As is apparent from the above embodiment, according to the first aspect of the present invention, one end of each of the vanes of each compression mechanism is rotatably connected by a connecting member, and the shaft of the connecting member is rotated. Since the support point is provided at the center of the height in the direction,
The vane of one compression mechanism is pushed up by the eccentric rotational movement of the piston, and the operation is transmitted to a connecting member rotatably connected to one end of the vane, and pushes down the vane of the other compression mechanism, as a result, The vane is pressed against the piston. Therefore, the vane can be reliably pressed against the piston.

According to the second aspect of the present invention, the connecting portion of the vane with the connecting member is formed as a spherical concave portion, and both ends of the connecting member are formed as spherical convex portions. Can be reduced at the connection portion, and wear at this portion can be suppressed.

According to the third aspect of the present invention, the ends of the vanes of each compression mechanism are connected to each other by a connecting member via an elastic member, and the connecting member is supported by a central portion of the connecting member in the axial height. Since the point is provided, the vane of one compression mechanism is pushed up by the eccentric rotational movement of the piston, and the operation is transmitted to the connecting member via the elastic member, and the vane of the other compression mechanism is pushed down. As a result, the vane is pressed against the piston. Therefore, the vane can be reliably pressed against the piston. Furthermore, by appropriately setting the rigidity of the elastic member in advance, the vane can be pressed against the piston with an optimal and constant force, and the wear of the vane tip can be reduced. Further, even if gaps between components due to component tolerances or assembly tolerances are generated, they are absorbed by the elastic members, and thus component processing or assembly becomes easy.

According to the fifth aspect of the present invention, the ends of the vanes of each compression mechanism are connected to each other by an arc-shaped connecting member, and a part of the connecting member is brought into contact with the inner wall of the sealed container. Therefore, the vane of one compression mechanism is pushed up by the eccentric rotational movement of the piston, and the operation is transmitted to an arc-shaped connecting member rotatably connected to one end of the vane, and the vane of the other compression mechanism is moved. Press down, so that the vane is pressed against the piston. Therefore, the vane can be reliably pressed against the piston.

According to the sixth aspect of the present invention, since the arcuate connecting member itself has elasticity, the arcuate connecting member has the same effect as that of the third aspect. By appropriately setting the rigidity of the vane, the vane can be pressed against the piston with an optimal and constant force, and the progress of wear of the vane tip can be reduced. Further, even if gaps between components due to component tolerances or assembly tolerances are generated, they are absorbed by the elastic members, and thus component processing or assembly becomes easy.

As described above, it is possible to press the vane against the piston with a relatively simple and secure constant force without using an elastic member for pressing the vane against the piston as in the conventional case. The effect that can be obtained can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a two-cylinder rotary compressor showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a two-cylinder rotary compressor showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a two-cylinder rotary compressor showing a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional two-cylinder rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 6 Intermediate partition plate 9a, 9b Vane 10a, 10b Piston 13a, 13b Vane recess 14 Connection member 14a, 14b Connection member convex part 15 Connection member support point 21a, 21b Elastic member 22 Arc-shaped connection member

Claims (6)

[Claims] 1. An electric motor unit, two compression mechanism units installed in an axial direction via an intermediate partition plate driven by the electric motor unit, and transmitting the rotational force of the electric motor unit to the compression mechanism unit. And a crankshaft having two eccentric shaft portions that are opposed to each other by 180 degrees.
The cylinder comprises a cylinder, a vane slidably installed in a groove provided in the cylinder, and a piston rotatably fitted to the eccentric shaft portion of the crankshaft. A main bearing and a sub-bearing of the crankshaft are installed at both ends in the axial direction of the mechanism, and one end of each of the vanes of each compression mechanism is rotatably connected to each other by a connecting member. A two-cylinder rotary compressor with a support point in the center. 2. The two-cylinder rotary compressor according to claim 1, wherein the connecting portion of the vane with the connecting member is a spherical concave portion, and both ends of the connecting member are spherical convex portions. 3. An electric motor unit, two compression mechanism units installed in an axial direction via an intermediate partition plate driven by the electric motor unit, and transmitting a rotational force of the electric motor unit to the compression mechanism unit. And a crankshaft having two eccentric shaft portions that are opposed to each other by 180 degrees.
The cylinder comprises a cylinder, a vane slidably installed in a groove provided in the cylinder, and a piston rotatably fitted to the eccentric shaft portion of the crankshaft. A main bearing and a sub-bearing of the crankshaft are installed at both ends in the axial direction of the mechanism, and one end of each of the vanes of each compression mechanism is connected to each other via an elastic member. A two-cylinder rotary compressor with a support point in the center. 4. The two-cylinder rotary compressor according to claim 1, wherein the support point is provided on the intermediate partition plate. 5. An electric motor unit, two compression mechanism units installed in an axial direction via an intermediate partition plate driven by the electric motor unit in the closed container, and a compression unit which applies a rotational force of the electric motor unit to the compression unit. A crankshaft having two eccentric shafts opposed to each other by 180 degrees for transmission to a mechanism is installed, and each compression mechanism is slidably installed in a cylinder and a groove provided in the cylinder. And a piston rotatably fitted to an eccentric shaft portion of the crankshaft. The main bearing and the auxiliary bearing of the crankshaft are provided at both axial ends of these two compression mechanism portions. A two-cylinder rotary type in which a bearing is installed, and one end of each of the vanes of each compression mechanism is rotatably connected to each other by an arcuate connecting member, and a part of this connecting member is brought into contact with the inner wall of the closed container. Compressor. 6. The two-cylinder rotary compressor according to claim 5, wherein the arc-shaped connecting member is an elastic member.