JPH05149281A - Two cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To form cylinders into thin wall while insuring rigidity of respective cylinders and make the pressing force of respective blade against rollers nearly constant. CONSTITUTION:A torsion spring 6 having a pair of leg parts 61, 62 is supported on a middle plate 5 so as to be oscillatable in the sliding direction of respective blades 37, 38, the end parts of the leg parts 61, 62 of the torsion spring 6 are respectively brought in contact with the back surfaces of the respective blades 37, 38, and the blades 37, 38 are energized to the roller 35, 36 sides through both leg parts 61, 62.

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 mounted on a refrigerator or the like.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 5, a compressor of this type has a pair of eccentrics formed integrally with the drive shaft A by inserting the drive shaft A of the motor into an insertion hole B1 formed in a middle plate B. Rollers D1 of cylinders C1 and C2 arranged so that parts A1 and A2 are opposed to each other with the middle plate B interposed therebetween.
The front head and the rear head are assembled above and below each of the cylinders C1 and C2 while being fitted into D2.

In such a compressor, however, as shown in, for example, Japanese Utility Model Laid-Open No. 1-118183, and as shown in FIG. 5, the cylinders C1 and C2 are constantly slid on the rollers D1 and D2. While providing the blades E1 and E2 which come into contact with and retreat by the revolution of the rollers D1 and D2, the blades E1 and E2 in the cylinders C1 and C2 are provided.
Back pressure chambers F1 and F2 and spring holes G extending in the radial direction on the back side of
1 and G2 are formed, and coil springs H1 and H2 for pressing the blades E1 and E2 toward the rollers D1 and D2 are installed in the spring holes G1 and G2.

[0004]

By the way, in the compressor having the above structure, the spring holes G1 are formed in the cylinders C1 and C2.
Since G2 is formed and the coil springs H1 and H2 are provided in the spring holes G1 and G2, respectively, it goes without saying that the machining process of the cylinders C1 and C2 and the number of parts are increased. Since the spring holes G1 and G2 extending in the radial direction must be formed in each of the cylinders C1 and C2, the rigidity of the cylinders C1 and C2 is reduced accordingly.
In some cases, there is a problem that the cylinders C1 and C2 are distorted. For such a problem, it is necessary to lengthen the axial dimensions L1 and L2 of the cylinders C1 and C2. However, if the axial dimensions L1 and L2 of the cylinders C1 and C2 are lengthened as described above, the weight increases accordingly. Of course, there is a problem that the compressor becomes large.

On the other hand, to press the blades E1 and E2 toward the rollers D1 and D2,
When the coil springs H1 and H2 are used for each two, as the blades E1 and E2 move from the most advanced positions to the most retracted positions with respect to the cylinder chambers C1 and C2, the coil springs H1 and H2 H2 is sequentially compressed, and the spring reaction force generated in the coil springs H1 and H2 increases proportionally, so that the blades E1 and E1
The pressure contact force of No. 2 against the rollers D1 and D2 becomes weakest at the positions where the blades E1 and E2 are most advanced with respect to the cylinder chambers C1 and C2, while the cylinder chambers C1 and C2 are
The position to leave most is also strongest. Therefore, when the compressor is driven, in some cases, the blades E1 and E
2 causes a gap between the rollers D1 and D2, a so-called blade jump phenomenon occurs, and the blade E1
Since the frictional force between E2 and the rollers D1 and D2 also changes with the revolution of the rollers D1 and D2, the torque of the motor also fluctuates.

The present invention was developed in view of the above circumstances, and it is an object of the present invention to secure the rigidity of each of the cylinders so that the cylinders can be made thin and yet the rollers of each of the blades. It is to provide a two-cylinder rotary compressor that can keep the pressure contact force against the two cylinders almost constant.

[0007]

According to the present invention, however, the front head 33, the rear head 34, and the rollers 35.3 are provided.
6 and a pair of cylinders 31.3 in which the tips of the rollers 35 and 36 come into contact and slide, and blades 37 and 38
In the two-cylinder rotary compressor in which the compression elements 3 are formed by stacking 2 through the middle plate 5 and the eccentric portions 41 and 42 formed in the axial direction of the drive shaft 4 are inserted into the respective rollers 35 and 36. , The torsion spring 6 having a pair of leg portions 61 and 62 is provided near the rear surface of the middle plate 5 when the blades 37 and 38 are retracted.
62 swingably supports the blades 37 and 38 in the sliding direction, and the leg portion 6 of the torsion spring 6 is supported.
It is characterized in that the ends of 1.62 are brought into contact with the back surfaces of the blades 37 and 38, respectively, by constantly pressing them.

[0008]

In the compressor according to the present invention, when the blades 37 and 38 are reciprocally reciprocally moved due to the driving of the compressor, the torsion spring 6 swings to move the leg portions 61 and 62. The blades 37 and 38 through the torsion spring 6
With the spring reaction force set at the time of assembly, it is possible to press the outer peripheral surfaces of the rollers 35 and 36 with a substantially constant pressing force. Therefore, when the torsion spring 6 is assembled, the pressing force acting on each of the blades 35 and 36 through the torsion bar 6 is applied to the blades 35 and 3.
If the strength is adjusted in advance so that the jump phenomenon does not occur in 6, the blade may move the roller 35 when the compressor is driven.
It is possible to always make sliding contact with the outer peripheral surface of 36, and it is also possible to keep the frictional force between the blades E1 and E2 and the rollers D1 and D2 almost always constant.

Further, in the compressor of the present invention, since both the blades 37 and 38 can be operated by only one torsion spring 6, it is possible to reduce the number of parts and the assembling labor. Since it is not necessary to form a spring hole extending in the radial direction in each cylinder as in the conventional case, the rigidity of each cylinder can be increased and the cylinder can be formed thin.

[0010]

1 is a vertical cross-sectional view of an essential part of a vertical two-cylinder rotary compressor. An oil reservoir 1a is formed at the bottom of a vertically long closed casing 1 and the inside of the closed casing 1 is formed. A motor 2 is arranged on the upper part and a compression element 3 is arranged on the lower part, and the compression element 3 and the motor 2 are interlockingly connected via a drive shaft 4.

As is known, the motor 2 comprises a stator 21 fixed to the inner wall of the closed casing 1 and a rotor 22 rotating in the stator 21, and the drive shaft 4 is connected to the rotor 22. ing.

The compression element 3 is provided with a first cylinder 31 and a second cylinder 32 which are vertically stacked with a middle plate 5 interposed therebetween, and a front head 33 and a rear head 34 which sandwich these cylinders 31 and 32. The first roller 35 is placed in the cylinder chamber 31a of the first cylinder 31, and the second roller 3 is placed in the cylinder chamber 32a of the second cylinder 32.
6 are respectively installed in the interior of the drive shaft 4, and the
The eccentric part 41 and the second eccentric part 42 are integrally formed, and the first and second eccentric parts 41 and 42 are arranged vertically with the middle plate 5 interposed therebetween, and the first eccentric part 41 and the second eccentric part are arranged. The part 42 to the roller 35 of each of the cylinders 31 and 32.
・ They are fitted to 36 respectively.

The eccentric direction of the first eccentric portion 41 is the second direction.
The eccentric portion 42 is displaced by 180 ° with respect to the eccentric direction.

The first and second cylinders 31 and 32 have blade sliding grooves 31b and 32b, one end of which opens into the cylinder chambers 31a and 32a, and a back pressure chamber extending in the axial direction of the cylinders 31 and 32. 31c and 32c are provided, and the plate-like first and second blades 37 and 38 are slidably inserted into and supported by the blade sliding grooves 31b and 32b, respectively, by the blades 37 and 38. The cylinder chambers 31a and 32a are divided into a low pressure chamber and a high pressure chamber.

In the above-described compressor, however, in the embodiment shown in the drawings, it is on the outer peripheral surface of the middle plate 5 and near the back surface when the blades 37, 38 are retracted, that is, the back pressure chambers 31c, 32c. A pair of support pieces 51 and 52 are integrally formed at opposite positions to form a constant gap S between the support pieces 51 and 52, while the lengthwise intermediate portion of the metal wire is bent into a coil to form a coil portion. 60 and the first and second leg portions 61 and 62 extending in a divergent manner from both ends of the coil portion 60 are separately formed, and the torsion spring 6 is formed.
The coil portion 60 of the gap S between the support pieces 51 and 52
By loosely inserting the pin 53 into the coil portion 60, the torsion spring 6 is swingably supported by the pin 53, and the leg portion 61.
2 is swingable in the sliding direction of the blades 37 and 38.

The first of the torsion springs 6,
The second leg portions 61, 62 are opened in the direction in which they move away from each other against the spring reaction force of the torsion spring 6, and these leg portions 6
The opening θ of 2 is made wider than the opening of both legs 61, 62 in the natural state of the torsion spring 6, and a predetermined spring reaction force is generated in the torsion spring 6, so that both legs 61
The ends of 62 are pressed against the back surfaces of the blades 37 and 38 in the back pressure chambers 31c and 32c, respectively.

In the illustrated embodiment, the blade 37.
On the back surface of 38, concave grooves 37a and 38a extending in the axial direction of the cylinders 31 and 32 are formed, while the leg portions 61 are formed.
-The free end portion of 62 is curved in an arc shape, and the curved portion 61a
-By contacting the outer peripheral surface of 62a with the groove bottoms of the concave grooves 37a and 38a, the leg portions 61 and 62 are moved to the blade 3
The removal of the leg portions 61 and 62 from the back surface of the blades 7 and 38 is prevented, and the sliding of the leg portions 61 and 62 with respect to the blades 37 and 38 can be performed smoothly.

In the compressor having the above structure, the first blade 37 and the second blade 3 are rotated along with the revolution of the first eccentric part 41 and the second eccentric part 42 whose eccentric directions are different by 180 °.
8 reciprocally reciprocates in the blade sliding grooves 31b and 32b.

That is, when the first blade 37 moves to the most advanced position (the position shown by the solid line in FIG. 4) with respect to the first cylinder chamber 31a, the second blade 38 moves the second cylinder chamber 32a. To the most retreat position (position shown by the solid line in FIG. 4) with respect to the first cylinder chamber 31a and the most retreat position (position shown by the two-dot chain line in FIG. 4) with respect to the first cylinder chamber 31a. ), The second blade 37 moves to a position (the position indicated by a chain double-dashed line in FIG. 4) most advanced with respect to the second cylinder chamber 32a.

On the other hand, the torsion spring 6 is swingably supported by the middle plate 5 via the pin 53, and the free end portion of the first leg portion 61 is attached to the back surface of the first blade 37. Since the free end portions of the second leg portions 62 are in contact with the back surfaces of the second blades 38, respectively, the torsion spring 6 causes the pin 53 to move with the reversible reciprocating movement of the blades 37, 38. 4 and swings between the position shown by the solid line in FIG. 4 and the position shown by the chain double-dashed line, and the opening degrees θ of both legs 61 and 62 hardly change.

Therefore, when the compressor is driven, the both blades 3 are
The springs 7 and 38 always come into pressure contact with the outer peripheral surfaces of the rollers 35 and 36 with a substantially constant pressing force by the spring reaction force set when the torsion spring 6 is assembled. In other words, the torsion When assembling the spring 6,
If the pressing force acting on each of the blades 35 and 36 through the twisting ridge 6 is adjusted in advance to such a strength that the jump phenomenon does not occur in the blades 35 and 36, the blades are driven when the compressor is driven. Can always be in sliding contact with the outer peripheral surfaces of the rollers 35 and 36, and the blade E
The frictional force between the rollers 1 and E2 and the rollers D1 and D2 can be kept substantially constant, and the fluctuation of the motor torque can be prevented.

In the above embodiments, the vertical two-cylinder rotary compressor is applied, but the horizontal two-cylinder rotary compressor can also be applied.

[0023]

As described above, according to the present invention, the torsion spring 6 having the pair of leg portions 61 and 62 is provided near the rear surface when the blades 37 and 38 of the middle plate 5 are retracted. Supports the blades 37, 38 so as to be swingable in the sliding direction, and contacts the ends of the leg portions 61, 62 of the torsion spring 6 against the back surfaces of the blades 37, 38, respectively, so as to constantly press them. As a result, the blades 37 and 38 are driven by the compressor.
During reversible reciprocal movement of the roller 35, the torsion spring 6 swings to cause the blades 37 and 38 to be constantly pressed by the spring reaction force set when the torsion spring 6 is assembled with a substantially constant pressing force. The outer peripheral surface of the blade 36 can be pressed against the outer peripheral surface of the blade 36. Therefore, when the torsion spring 6 is assembled, the blade 35.
By preliminarily adjusting the pressing force acting on 6 to such a strength that the jump phenomenon does not occur in the blades 35 and 36, the blade is always attached to the outer peripheral surfaces of the rollers 35 and 36 when the compressor is driven. It is possible to make sliding contact, and moreover, the frictional force between the blades E1 and E2 and the rollers D1 and D2 can be made almost constant at all times, and it is possible to reliably prevent the torque of the motor from varying. You can do it.

According to the invention, both blades 37
Since 38 can be operated by only one torsion spring 6, it is possible to reduce the number of parts and assembling work, and it is necessary to form a spring hole extending in the radial direction in each cylinder as in the conventional case. Therefore, the rigidity of each cylinder can be increased, the cylinder can be formed thin, and the compressor can be downsized and its weight can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a compressor according to the present invention.

FIG. 2 is a cross-sectional view showing an enlarged main part of the compressor according to the present invention.

FIG. 3 is a plan view of a main part of a middle plate to which a torsion spring is attached.

FIG. 4 is an operation explanatory view of the compressor according to the present invention.

FIG. 5 is a vertical cross-sectional view of a main part of a conventional compressor.

[Explanation of symbols]

 3 Compressor element 31/32 Cylinder 33 Front head 34 Rear head 35/36 Roller 37/38 Blade 4 Drive shaft 41/42 Eccentric part 5 Middle plate 6 Torsion spring 61/62 Leg part

Claims (1)

[Claims] 1. A front head 33, a rear head 34,
Also, a pair of cylinders 31 and 32, in which the rollers 35 and 36 and the blades 37 and 38 whose tip ends come into contact with the rollers 35 and 36 and slide, are laminated via the middle plate 5 to form the compression element 3. The rollers 35 and 36,
In the two-cylinder rotary compressor in which the eccentric parts 41, 42 formed in the axial direction of the drive shaft 4 are inserted and fitted, a pair of leg parts 61 are provided near the back surface when the blades 37, 38 of the middle plate 5 are retracted. .Torsion spring 6 having 62
The leg portions 61 and 62 so as to be swingable in the sliding direction of the blades 37 and 38, and the torsion spring 6
2. The two-cylinder rotary compressor, wherein the end portions of the leg portions 61 and 62 in are contacted with the back surfaces of the blades 37 and 38, respectively, by constantly pressing them.