JP3066171B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor in which both scrolls are turned with each other to perform compression.

[0002]

2. Description of the Related Art A conventional scroll compressor is configured such that a fixed scroll is fixed to an airtight container, and the orbiting scroll is orbited around the center of the fixed scroll.

[0003] However, in the conventional apparatus, since the drive shaft of the orbiting scroll has a cantilever structure, vibration is increased in the apparatus for high-speed rotation. Further, in the case of a large-size one, the centrifugal force of the orbiting scroll becomes extremely large, and the load acting on the bearing provided on the back of the orbiting scroll increases, which may lead to a decrease in efficiency and a decrease in reliability.

On the other hand, as a scroll compressor for high-speed rotation, Japanese Patent Publication No. 57-49721 discloses a type in which both scrolls rotate and one scroll rotates the other scroll. .

[0005]

However, this type has the following problems. That is, since the orbiting scroll is made to swing with respect to the drive shaft, the orbiting scroll may vibrate violently during high-speed rotation, and since both scrolls rotate, centrifugal force acts on the wrap, The strength of the wrap had to be compensated for, and it was not always satisfactory as a scroll compressor for high-speed rotation.

The present invention solves the above problems,
It is an object of the present invention to provide a scroll compressor that is large without compensating for the strength of the scroll wrap and that is suitable for high-speed rotation.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a scroll compression element and an electric element for driving the scroll compression element. The scroll compression element comprises a head plate and a spiral wrap provided on the head plate. A first scroll having a head plate, a second scroll having a head plate and a spiral wrap erected on the head plate, a drive shaft fitted to the head plate of these scrolls and transmitting the torque of the electric element,
A connecting member for revolving the first and second scrolls so that the first and second scrolls do not rotate. The laps of the first and second scrolls are engaged with each other via the connecting member, and the drive shaft is attached to each of the head plates. An eccentric piece that is fitted and has a phase shifted by 180 ° and that controls the rotation of the one scroll, and an Oldham that revolves without rotating the other scroll with respect to the one scroll. It consists of a joint.

Further, in the present invention, the drive shaft is provided with cranks fitted to the respective head plates and shifted by 180 ° in phase, and the connecting member is provided with eccentric portions fitted to the respective head plates. .

[0009]

According to the present invention, as described above,
Rotating the first and second scrolls with a connecting member that changes the driving force of a drive shaft that drives the first and second scrolls with a phase shift of 180 ° to revolve so as not to rotate,
While reducing the orbital radius of each scroll,
The centrifugal force acting on each other is canceled to eliminate the need for a balancer.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the scroll compression element.

Reference numeral 1 denotes a closed container, in which a frame 2, a scroll compression element 3, and an electric element 4 for driving the scroll compression element are housed.

The frame 2 includes a main frame 5 for partitioning the inside of the closed container 1, an auxiliary frame 8 fixed to the main frame with bolts 6 to form a hollow space 7 therein, and a closed frame 1 on the main frame 5. Electric element 4 attached to the inner wall and inside
And a cylindrical frame 9 for disposing. The main frame 5 has a main bearing 1 that supports a drive shaft 10 of the electric element 4.
1 is provided at the center, and an auxiliary bearing 12 that supports the drive shaft 10 is provided at the center of the auxiliary frame 6.

The scroll compression element 3 includes a first scroll 15 having a head plate 13 and a spiral wrap 14 standing on the head plate, a head plate 16 and a spiral wrap 17 standing on the head plate. And a second scroll 18 having these wraps 14, 14
180 degrees of drive shaft 10 in the center part
The cranks 19 and 20 whose phases are shifted are fitted to each other, and the annular projecting walls 2 projecting inward of the main frame 5.
1 and an annular projecting wall 22 projecting inward from the auxiliary frame 8
And it is assembled between.

Reference numeral 23 denotes first and second scrolls 15 and 18.
Is a connecting member that revolves without rotating, and this connecting member is composed of an eccentric top 24 and an Oldham coupling 25.
The eccentric piece 24 is formed of a cylindrical main body 26 that is supported by the main frame 5 in parallel with the drive shaft 10, and an eccentric portion 27 that is fitted to the end plate 13 of the first scroll 15. This eccentric portion has the same eccentric amount as the crank 19 of the drive shaft 10. The Oldham coupling 25 is a ring 2 disposed between the end plates 13 and 16 of the first and second scrolls 15 and 18.
8 and the first scroll 15 attached to this ring.
A first key 30 sliding in the groove 29 of the end plate 13 of the second scroll 18 and a second key 32 similarly mounted on the ring 28 and sliding in the groove 31 of the end plate 16 of the second scroll 18. Have been.

The first and second scrolls 15 and 18 are configured such that a plurality of compression spaces 33 formed by the wraps 10 and 13 are gradually reduced from outside to inside by a connecting member 23.

The drive shaft 10 is provided with a discharge hole 34 communicating with the central compression space 33, and this discharge hole is
Is communicated with the space 35 in the closed container 1 on the upper side. This space forms a high-pressure chamber.

Reference numeral 36 denotes an oil hole for supplying oil stored on the main frame to a sliding surface between the main bearing 11 and the drive shaft 10 of the main frame 5.

Reference numeral 37 denotes a suction pipe attached to the closed container, and this suction pipe communicates with the hollow chamber 7. Reference numeral 38 denotes a discharge pipe attached to the upper wall of the closed container.

In the thus constructed scroll compressor, when the electric element 4 is rotated, the rotating force is applied to the first scroll 15 and the second scroll 18 via the cranks 19 and 20 of the drive shaft 10. Reportedly. And
The first scroll 15 and the second scroll 18 are revolved by the connecting member 23 so as not to rotate. Further, the first scroll 15 and the second scroll 18 revolve on the same circular orbit with a phase difference of 180 ° on the connecting member 23. And lap 1 by this revolution
The compression space 33 formed by 4, 17 gradually decreases from the outside to the inside, compresses the gas flowing into the hollow chamber 7 from the suction pipe 37, and compresses the gas from the discharge hole 34 of the drive shaft 10 to the closed container 1 It is discharged to the space 35 in the inside. The discharged gas is discharged from the discharge pipe 38 to the outside through the electric element 4.

The eccentric piece 24 of the connecting member 23 has a cylindrical main body 26 fitted to the main frame 5 and the first scroll 1.
5 and the eccentric part 27 fitted to the end plate 13
Scroll 1 driven by crank 19
5 is revolving so that it does not rotate. Further, since the eccentric piece 24 has the cylindrical body 26 facing the space 35 where the high pressure chamber is formed, the first scroll 13
It is pushed to the side and is prevented from coming off during driving.

The Oldham's joint 25 of the connecting member 23 slides the first key 30 in the groove 29 of the end plate 13 and the second key 32 in the groove 31 of the end plate 16 in the cross direction, thereby forming the drive shaft. The second driven by the ten cranks 20
Of the scroll 18 does not rotate with respect to the first scroll 15 and revolves.

The first scroll 15 and the second scroll 18 are connected to the cranks 19 and 20 of the drive shaft 10 by the eccentric piece 24 of the connecting member 23 and the Oldham coupling 25.
Is converted into orbital motion, and both scrolls 15, 18
Has a smaller orbital radius, thereby reducing vibrations caused by the orbital motion.

When the first scroll 11 and the second scroll 14 revolve at a shift of 180 °, the unbalance forces due to the centrifugal force at the time of the revolution cancel each other, and the vibration due to the unbalance force is suppressed to a small value. Eliminates the need for a balancer.

The orbital spacers of the first scroll 11 and the second scroll 14 are reduced by reducing the orbital radius, so that the scroll compressor can be downsized.

FIG. 3 shows another embodiment of the present invention, in which eccentric pieces 39, 39, 39 for revolving the first scroll 15 without rotating themselves are shifted by 120.degree. The pressing force acting on the back surface of the eccentric pieces 39, 39, 39 for changing the driving force by the revolving motion 19 into the revolving motion acts on the end plate 13 evenly, so that the overturning moment does not act on the first scroll 13.

FIG. 4 shows another embodiment of the present invention, in which an eccentric portion in which the eccentric piece 40 is shifted by 180 ° from the outer periphery of the end plates 13 and 16 of the first scroll 15 and the second scroll 18. Even if 41 and 42 are fitted together, the driving force of the drive shaft 10 can be converted into revolving motion in the same manner, and the parts can be shared.

FIGS. 5 and 6 show another embodiment of the present invention, in which cranks 44, 45 of a drive shaft 43 are provided.
To the end plates 13, 16 of the first and second scrolls 15, 18.
The same effect can be obtained by fitting the outer peripheral portion of the scroll compressor, and the drive source can be arbitrarily changed, and is suitable for an oilless scroll compressor.

FIGS. 7 and 8 show another embodiment of the present invention, in which the drive shaft 43 is disposed on the outer periphery of the end plates 13 and 16, and the connecting member 23 is connected to the eccentric piece 46 and the Oldham as in FIG. The same effect can be obtained by using the joint 25.

[0030]

As described above, according to the present invention, there is provided a scroll compression element and an electric element for driving the scroll compression element, and the scroll compression element is provided with a head plate and a spiral-shaped upright standing on the head plate. A first scroll having a wrap, a second scroll having a head plate and a spiral wrap erected on the head plate, and a drive shaft fitted to the head plate of these scrolls and transmitting the torque of the electric element. And a connecting member that revolves so that the first and second scrolls do not rotate. The wraps of the first and second scrolls are engaged with each other via the connecting member, and each of the wraps is connected to the drive shaft. A crank fitted to the head plate and shifted in phase by 180 ° is provided, and the connecting member is
An eccentric top that restricts the rotation of one scroll and an Oldham coupling that revolves without rotating the other scroll with respect to the one scroll, so that the first scroll and the second scroll are rotated by the crank of the drive shaft. Scroll and 1
When driven by being shifted by 80 °, these scrolls can be turned by being shifted by 180 ° on the same orbit by the connecting member, thereby canceling the unbalanced force due to the centrifugal force of the two scrolls, making it possible to eliminate the need for a balancer and revolving radius. , The turning speed is reduced, and vibration during high-speed rotation can be reduced.

Further, in the present invention, the drive shaft is provided with cranks fitted to the respective head plates and shifted by 180 ° in phase, and the connecting members are provided with eccentric portions fitted to the respective head plates. The members can be shared.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll compressor showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the scroll compression element of the present invention.

FIG. 3 is a cross-sectional view of a scroll compression element showing another embodiment of the present invention.

FIG. 4 is a sectional view of a scroll compressor showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a scroll compressor showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a scroll compression element showing another embodiment of the present invention.

FIG. 7 is a sectional view of a scroll compressor showing another embodiment of the present invention.

FIG. 8 is a cross-sectional view of a scroll compression element showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 scroll compression element 4 electric element 10, 43 drive shaft 13, 16 end plate 14, 17 wrap 15 first scroll 18 second scroll 19, 20, 44, 45 crank 23 connecting member 24, 46 eccentric piece 25 Oldham coupling

Claims (2)

(57) [Claims] 1. A scroll comprising a scroll compression element and an electric element for driving the scroll compression element, wherein the scroll compression element includes a first scroll having a head plate and a spiral wrap provided on the head plate, and a head plate. A second scroll having a spiral wrap erected on the end plate, a drive shaft fitted to the end plate of these scrolls to transmit the rotational force of the electric element, and the first and second scrolls. A connecting member that revolves without rotating, and a scroll compressor in which the first and second scroll wraps are engaged with each other via the connecting member;
The drive shaft is provided with a crank which is fitted to each of the end plates and is shifted in phase by 180 °, and the connecting member has an eccentric piece that regulates the rotation of one scroll, and the other eccentric piece for one scroll. A scroll compressor comprising an Oldham coupling that revolves without rotating the scroll. 2. A scroll comprising a scroll compression element and an electric element for driving the scroll compression element, wherein the scroll compression element has a first scroll having a head plate and a spiral wrap provided on the head plate, and a head plate. A second scroll having a spiral wrap erected on the end plate, a drive shaft fitted to the end plate of these scrolls to transmit the rotational force of the electric element, and the first and second scrolls. A connecting member that revolves without rotating, and a scroll compressor in which the first and second scroll wraps are engaged with each other via the connecting member;
The drive shaft is provided with a crank which is fitted to each of the head plates and is 180 ° out of phase, and the connecting member is provided with an eccentric portion which is fitted to each of the head plates. Scroll compressor.