JPH08159051A - Scroll compressor - Google Patents

Abstract

PURPOSE: To keep the sealing performance favorable while preventing seizure due to the contact of the tip of a scroll. CONSTITUTION: High pressure is applied to the back sides of mirror plates 41, 51 of a first scroll 4 and a second scroll 5 to press the respective scrolls 4, 5 in the axial direction. The first scroll 4 is connected to a driving shaft 2 of a motor M and supported on a first fixed member 3. The second scroll 5 can be displaced in the axial direction to a second fixed member 6. A thrust plate 9 which is fixed to the first fixed member 3 and brought into contact with the outer peripheral part of the mirror plate 41 of the first scroll 4 is disposed between the outer peripheral part of the mirror plate 41 in the first scroll 4 and the outer peripheral part of the mirror plate 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor used in refrigerators and the like.

[0002]

2. Description of the Related Art Conventionally, a compression element is composed of a fixed scroll fixed to a fixed member and a movable scroll connected to a drive shaft of a motor, and the spiral bodies projecting from the respective end plates are engaged with each other and compressed. A scroll type compressor that forms a chamber and supports the movable scroll by the fixed scroll and a fixed member is disclosed in, for example, Japanese Patent Publication No. 2-247.
It is also described in JP-A-7.

In this conventional scroll type compressor, as shown in FIG. 7, a fixed scroll A having a scroll A2 projecting from a mirror plate A1 has the same height as the scroll A2 on the peripheral edge of the mirror plate A1. A built-up portion A3 is formed, the built-up portion A3 is fixed to a fixing member C, and a discharge port A4 is provided at the center of the end plate A1 and a suction port A5 to which a suction pipe is connected is provided at the outer peripheral portion. There is.

A boss portion B3 into which an eccentric shaft portion D1 of a drive shaft D connected to a motor is fitted is formed in a movable scroll B having a scroll B2 projecting from an end plate B1 and the movable scroll B is driven by the boss portion B3. The shaft D is eccentrically rotated in conjunction with the rotational driving of the shaft D.

The fixed scroll A and the movable scroll B are combined in such a manner that the scrolls A2 and B2 are meshed with each other, and the scrolls A2 and B2 form a compression chamber E.

Further, the end plate A1 of the fixed scroll A is
A support portion F for sandwiching and supporting the end plate B1 of the movable scroll B is formed between the built-up portion A3 formed on the outer peripheral portion and the fixed member C, and the drive shaft D is fixed by the fixed member C. Bearings are supported, and an Oldham ring G is disposed on the rear side of the end plate B1 of the movable scroll B,
The movable scroll B is revolved around the center of the fixed scroll A without rotating with the eccentric rotation of the eccentric shaft portion D1 of the drive shaft D.

Then, the gas sucked from the suction port A5 is introduced between the spiral bodies A2 and B2, and the compression chamber E
After being compressed with, the gas is discharged from the discharge port A4 formed at the center of the fixed scroll A, and a gas hole B4 is formed in the end plate B2 of the movable scroll B during the compression in the compression chamber E. The intermediate pressure gas is introduced into the back pressure chamber H formed by the end plate B1 of the movable scroll B and the fixed member C from the hole B4.

From the suction port A5, the spiral bodies A2,
When the gas introduced between B2 becomes a high pressure state due to the compression action, the fixed scroll A and the movable scroll B are placed in the compression chamber E.
A force is generated to separate the fixed scroll A from the fixed scroll A.
Is fixed to the fixed member C, and the movable scroll B is restricted from moving in the axial direction at a support portion F formed by the fixed member C. Therefore, the fixed scroll A and the movable scroll B have their end plates A1. , B1 the center portion of the fixed scroll A swells and bends, and in order to prevent this bending, the pressure of the discharge gas acts on the fixed scroll A on the rear side of the end plate A1 of the fixed scroll A so that the end plate A
1 is prevented from bending, and with respect to the movable scroll B, by applying a back pressure to the end plate B1 of the movable scroll B by the intermediate pressure gas in the back pressure chamber H, the end plate B1 Bending is prevented and each spiral body A2, B2
A seal is provided between the end portions of the and the end plates B1 and A1 facing each other.

[0009]

By the way, in the conventional scroll type compressor, the pressure is highest at the spiral centers of the spiral bodies A2 and B2. Therefore, the high pressure gas causes the central portions of the spiral bodies A2 and B2 to move. When heated and extended, each end plate A
Since the back pressure presses 1 and B1, the spiral body A
2 and B2, the tooth tip on the center side is the end plate B1, A before the outer peripheral side.
It comes into contact with 1.

Furthermore, the separation gas between the fixed scroll A and the movable scroll B due to the high pressure gas in the compression chamber E acts on the suction gas only at the central portions of the end plates A1 and B1 in the high pressure state. The separation force does not act on the outer peripheral side of the low pressure state, whereas the back pressure acting on each end plate A1, B1 acts on almost the entire end face of each end plate A1, B1. In some cases, the pressing force due to this back pressure may be greater, and even if the fixed scroll A is fixed to the fixed member C and the movable scroll B is provided on the outer peripheral portion of the end plate A1 of the fixed scroll A, a built-up portion A3. Even if the axial movement is restricted by, the center side of each end plate A1, B1 is bent inward in the axial direction, so that the tip of the tip of each spiral body A2, B2 is an end plate. B1 It should be able to strongly pressed against the A1, a problem with the reliability of the compressor has occurred baking, such as occurred.

In order to prevent the spiral bodies A2, B2 from coming into contact with each other at the central portion, the length of each spiral body A2, B2 is made lower than the height of the built-up portion A3 of the fixed scroll A.
It is conceivable to prevent them from coming into contact with each other by the regulation by the padding portion A3, but in this case, the spiral bodies A2, B
Therefore, there is a problem in that the overall sealing property of No. 2 is deteriorated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a scroll type compressor which can prevent seizure due to contact of tooth tips of a spiral body and can maintain good sealing property. It is in.

[0013]

According to the first aspect of the present invention,
In the casing 1, the end plate 41 is provided with the spiral body 42 so as to project.
Scroll 4 and second scroll 52 with scroll 52 protruding from end plate 51
A compression element CF, which is composed of a scroll 5 and which forms a compression chamber 10 by meshing the scroll body 42 of the first scroll 4 and the scroll body 52 of the second scroll 5 with each other, is installed inside the first scroll 4 and the first scroll 4. In a scroll type compressor in which high pressure is applied to the rear side of the end plates 41 and 51 of the two scrolls 5 to press the scrolls 4 and 5 in the axial direction, the first scroll 4 is connected to the drive shaft 2 of the motor M. , The first scroll 4 is supported by the first fixing member 3, and the second scroll 5 is axially displaced with respect to the second fixing member 6 while the second fixing member 6 restricts radial movement. On the other hand, between the outer peripheral portion of the end plate 41 of the first scroll 4 and the outer peripheral portion of the end plate 51 of the second scroll 5, the first scroll member is fixed to the first fixing member 3. The end plate 41 the outer peripheral portion of 4 than the thrust plate 9 abuts is disposed.

According to the second aspect of the present invention, a detent member 94 for restricting the rotation of the second scroll 5 is interposed between the outer peripheral portion of the end plate 51 of the second scroll 5 and the thrust plate 9. Of.

According to a third aspect of the invention, the thrust plate 9 is formed of a ring member.

According to a fourth aspect of the present invention, the thrust plate 9 is formed with a key groove 91 for engaging the Oldham key 82 of the Oldham ring 8 for preventing the rotation of the first scroll 4.

The invention according to claim 5 is the casing 1
A first fixing member 3 for supporting the first scroll 4,
A low-pressure chamber in which the second scroll 5 is axially displaceable, and a suction pipe 14 for introducing a fluid into a compression element CF, which is arranged between the second scroll 5 and a second fixing member 6 that restricts radial movement, is opened. 71, a first high pressure chamber 72 in which the discharge port 53 of the compression element CF is opened, and high pressure gas in the first high pressure chamber 72 is introduced,
The external discharge pipe 15 is partitioned into the second high pressure chamber 73 which is open.

[0018]

According to the invention described in claim 1, when the first scroll 4 is revolved along with the drive shaft 2 of the motor M to compress the gas in the compression chamber 10, the compressed gas in the compression chamber 10 is compressed. To each scroll 4, 5, each scroll 4,
Even if the force of separating 5 is applied, high pressure is applied to the rear surface side of each end plate 41, 51 to axially press each scroll 4, 5 to counter the separating force, and thus each scroll 42, The sealability of the tooth tip of 52 is secured.

Moreover, even if the central portions of the spiral bodies 42, 52 are heated by the compressed gas and extend, and the pressing force acting on the back surface of the first scroll 4 becomes too large, this pressing force may be increased. The pressure is not received by the fixed scroll as in the conventional case, but is received by the thrust plate 9 fixed to the first fixing member 3,
The axial movement of the scroll 4 is blocked by the thrust plate 9 and the second scroll 5 is axially displaceable with respect to the second fixing member 6, so that the spiral bodies 42, 52 are heated. Even if the center part of the end plate 41 of the first scroll 4 bends inward in the axial direction, the second scroll 5 can be displaced in the separating direction. Each end plate 5
It is possible to properly set the pressing force against the blades 1 and 41 in a wide operating range, and prevent the spiral bodies 42 and 52 from being damaged due to baking.

According to the second aspect of the present invention, a detent member 94 for restricting the rotation of the second scroll 5 is interposed between the outer peripheral portion of the end plate 51 of the second scroll 5 and the thrust plate 9. Therefore, the second scroll 5 can be axially displaceably supported by using the thrust plate 9 while also preventing rotation.

According to the third aspect of the invention, since the thrust plate 9 is formed of a ring member, a large supporting area for the first scroll 4 can be obtained, so that the first scroll 4 can be favorably supported.

According to the fourth aspect of the present invention, the thrust plate 9 is engaged with the Oldham key 82 of the Oldham ring 8 for preventing the rotation of the first scroll 4 from being engaged with the key groove 91.
Since the groove is formed, the groove can be formed more easily than in the conventional case where the groove is formed in the fixing member.

According to the fifth aspect of the invention, the first fixing member 3 for supporting the first scroll 4 in the casing 1 is provided.
And the second scroll 5 is axially displaceable and a suction pipe 14 for introducing a fluid into the compression element CF disposed between the second fixing member 6 that restricts radial movement is opened. The low pressure chamber 71, the first high pressure chamber 72 in which the discharge port 53 of the compression element CF is opened, and the second high pressure chamber 73 in which the high pressure gas of the first high pressure chamber 72 is introduced and the external discharge pipe 15 is opened are defined. Therefore, it is possible to prevent the compression element CF and the suction gas from being heated by the high pressure gas.

[0024]

1 shows a scroll compressor according to a first embodiment of the present invention, in which a hermetic casing 1 is provided with a drive shaft 2 for a motor M.
The first fixing member 3 for supporting the first fixing member 3 is fixed, and the compression element CF driven by the motor M is disposed above the first fixing member 3 to support the first fixing member 3 and The motor M is arranged below the first fixing member 3.

In the compression element CF, the scroll 42 is provided on the end plate 41 so as to project, and the first scroll 4 which is a movable scroll connected to the drive shaft 2 of the motor M and the end plate 51.
And a second scroll 5 serving as a fixed scroll.
Are arranged in such a manner that the respective spiral bodies 42 and 52 are engaged with each other, and the compression chamber 10 is formed by the spiral bodies 42 and 52.
Is formed.

The second scroll 5 has a projection 54 having a discharge port 53 for discharging the compressed gas compressed in the compression chamber 10 into the casing 1 at the center of the rear surface of the end plate 51 of the second scroll 5. are doing.

Further, the end plate 51 of the second scroll 5 is provided.
On the back side, a plate-shaped second fixing member 6 fixed to the casing 1 is disposed with a predetermined gap with the end plate 51, and a support hole 61 formed in the central portion of the second fixing member 6 The protrusion 54 is supported so as to be movable in the axial direction and regulate the movement in the radial direction.

A first seal member 11 is provided in the support hole 61 for sealing the gap with the protrusion 54.
The second scroll 5 has an annular second seal member 12 for sealing between the end plate 51 and the second fixing member 6 at an intermediate position in the radial direction on the back surface of the end plate 51 of the second scroll 5. End plate 51 so that it can be displaced in the axial direction
An intermediate pressure chamber 62, which is disposed in an annular groove formed on the back side of the end plate 51 and is hermetically closed by the first seal member 11 and the second seal member 12. The intermediate pressure gas in the compression chamber 10 is introduced into the intermediate pressure chamber 62 via the gas introduction hole 55 formed in the end plate 51. The intermediate pressure gas seals the second seal member 12 by pressing the second seal member 12 radially outward and toward the second fixing member 6.

The high pressure gas discharged from the discharge port 53 acts as a back pressure on the end surface of the protrusion 54, and the intermediate pressure of the intermediate pressure chamber 62 acts on the end plate 51 as a back pressure. The second scroll 5 is pressed in the axial direction.

Further, the first fixing member 3 and the second fixing member 3
The casing 1 is partitioned by the fixing member 6, and the compression element CF is disposed between the first fixing member 3 and the second fixing member 6 to introduce a fluid into the compression element CF. Of the low pressure chamber 71 in which the suction pipe 14 of the first fixing member 3 is opened, the first high pressure chamber 72 in which the discharge port 53 of the compression element CF is opened, and the lower side of the first fixing member 3 are opened. In addition, the motor M is arranged to form a second high pressure chamber 73 in which the external discharge pipe 15 is opened.

Then, on the outer peripheral portion of the second fixing member 6,
By connecting one end of the internal discharge pipe 16 to the internal discharge pipe 16
Is passed through the low pressure chamber 71, the other end is connected to the through hole 31 provided in the first fixing member 3, and the second high pressure chamber 73 is opened so that the first high pressure chamber 72 is opened. The discharged high pressure gas is introduced into the second high pressure chamber 73.

Further, as shown in FIGS. 1 and 3, the first scroll 4 is a boss in which the eccentric shaft portion 21 of the drive shaft 2 is fitted to the rear side of the end plate 41 via a slide bush 22. 2, the end plate 41 has a circular shape as shown in FIG.
6, the end plate 41 of the first scroll 4
Is formed with a notch 44 having a depth that does not interfere with the internal discharge pipe 16 when the swirling motion is performed.

Reference numeral 45 is an end plate 41 of the first scroll 4.
A pair of Oldham key grooves for slidably engaging the Oldham key 81 of the Oldham ring 8 arranged between the first scroll 4 and the first fixing member 3, and the first scroll 4 rotates about its own axis. I am trying to be able to revolve around.

On the other hand, as shown in FIGS. 1 to 3, the Oldham ring 8 disposed between the rear surface of the end plate 41 of the first scroll 4 and the first fixing member 3 is, as shown in FIG. The Oldham key 81, 8 has an oval shape and engages with the keyway 45, 45 of the first scroll 4 in a straight line portion.
1, and Oldham keys 82, 82 slidably engaged with Oldham key grooves 91, 91 formed in a thrust plate 9 (described later) are formed on the arc portion. The keys 81 and 82 are projected in the same direction.

Further, the end plate 41 of the first scroll 4 is provided.
Is supported by an annular thrust receiving portion 32 formed on the first fixing member 3, and the thrust receiving portion 32 is located inward of the Oldham ring 8 and the thrust receiving portion 32 is The eccentric shaft portion 21 of the drive shaft 2 is provided on the inner peripheral side.
Also, the boss portion 43 of the first scroll 4 forms a space in which it can turn.

Further, a seal ring 33 that abuts the end plate 41 of the first scroll 4 is provided on the inner peripheral portion of the thrust receiving portion 32. With the seal ring 33,
The space in which the eccentric shaft portion 21 swirls is defined as the low pressure chamber 71.
And a back pressure chamber 34 defined by Reference numeral 13 is a third seal member arranged between the seal ring 33 and the first fixing member 3 so that the third seal member 13 seals between the back pressure chamber 34 and the low pressure chamber 71. I have to.

In the back pressure chamber 34, an oil supply passage (not shown) for forming the oil accumulated at the bottom of the casing 1 on the drive shaft 2 is provided.
The first scroll 4 is back-pressed by the high-pressure oil accumulated in the back pressure chamber 34 to press the first scroll 4 in the axial direction.

Then, by the orbital drive of the first scroll 4 with respect to the second scroll 5, the respective spiral bodies 4 are
The volume of the compression chamber 10 formed between 2, 52 is changed,
The low pressure gas sucked from the suction pipe 14 penetrating the casing 1 and opening to the low pressure chamber 71 is supplied to each of the swirl members 4
The high pressure gas that is introduced between the second and the second compression chambers 52, is compressed in the compression chamber 10, and is discharged from the discharge port 53 formed in the protrusion 54 of the second scroll 5 to the first high pressure chamber 72. After being discharged to the second high pressure chamber 73 via 16, the external high pressure chamber 73 is discharged to the outside of the casing via the external discharge pipe 15.

In the above-described structure, in the first embodiment, the first fixing member 3 is fixed between the outer peripheral portion of the end plate 41 of the first scroll 4 and the outer peripheral portion of the end plate 51 of the second scroll 5. The thrust plate 9 is arranged so as to come into contact with the outer peripheral portion of the end plate 41 of the first scroll 4.

The thrust plate 9 is formed of a ring member having an inner peripheral surface on which the scrolls 42, 52 of the scrolls 4, 5 can revolve.
6, a through hole 92, and an intake gas introducing portion 93 notched in the upper surface in accordance with the shape of the opening of the intake pipe 14,
The Oldham keys 82, 82 of the Oldham ring 8 on the lower surface
And a pair of the Oldham key grooves 91, 91 for engaging the second scroll 5 are formed on the upper surface of the Oldham key grooves 91, 91 facing the Oldham key grooves 91, 91.
Bolt disposing portions 95, 95 are formed so as to dispose the bolt J used for fixing to the thrust plate 9 via the bolt disposing portion 95.

Then, the thrust plate 9 is fixed to the fixing portion 35 protruding from the first fixing member 3 by bolting.

The end plate 51 of the second scroll 5 is also provided.
4, is formed in a disk shape having a diameter substantially the same as the inner diameter of the thrust plate 9, and further, a part of the outer peripheral portion thereof is formed by the bolt disposing portion 9 of the thrust plate 9.
The pair of mounting portions 56, 56 are formed so as to extend outward in the radial direction so as to oppose to each other.

The plate-shaped detent member 94, which draws an arc having a diameter larger than the inner diameter of the thrust plate 9, is fixed to the mounting portions 56, 56 with a bolt J. , Is formed of a leaf spring having a curved cross section, and as shown in FIG. 5, after fixing the detent member 94 to the mounting portions 56, 56 of the second scroll 5, both ends of the detent member 94 are Thrust plate 9
It is fixed on the upper surface of. Furthermore, since the second scroll 5 is fixed to the thrust plate 9 via the whirl-stop member 94 composed of a leaf spring, the second scroll 5 is prevented from rotating and the spring effect of the leaf spring causes It is displaceable in the axial direction.

As described above, in the first embodiment, the first
When the scroll 4 is revolved along with the rotational drive of the drive shaft 2 of the motor M to compress the gas in the compression chamber 10,
Even if a force for separating the scrolls 4 and 5 is generated by the compressed gas in the compression chamber 10, the second scroll 5 is pressed by the discharge gas acting on the protrusion 54 and the intermediate pressure gas in the intermediate pressure chamber 62. Then, by pressing the first scroll 4 with the high-pressure oil in the back pressure chamber 34, the scrolls 4 and 5 are pressed in the axial direction to oppose the separating force, and thus the scrolls 42 and 52. It is possible to secure the sealability of the tooth tip of the.

Even if the central portions of the spiral bodies 42 and 52 are heated by the compressed gas and expand, and the pressing force acting on the back surface of the first scroll 4 becomes too large, This pressing force is received by the thrust plate 9 fixed to the first fixing member 3 without being received by the fixed scroll as in the conventional case, so that the axial movement of the first scroll 4 is prevented by the thrust plate 9. Since the second scroll 5 is supported by the second fixing member 6 so as to be displaceable in the axial direction, the spiral bodies 42 and 52 are expanded by heating, and Even if the central portion of the end plate 41 of the first scroll 4 bends inward in the axial direction, the second scroll 5 can be displaced in the direction in which it separates. The pressing force to the end plates 41 and 51 can be properly set in a wide operating range, can prevent damage from baking of the spiral 42 and 52.

Moreover, the end plate 51 of the second scroll 5 is used.
The outer periphery is attached to the thrust plate 9 by the rotation stopping member 9
Since it is supported so as to be displaceable in the axial direction via 4,
Using the thrust plate 9, the scroll 5 can be supported so as to be displaceable in the axial direction, while also preventing rotation. Further, since the detent member 94 is formed of an arcuate leaf spring, an initial load is also applied.

Further, since the thrust plate 9 is formed of the ring member, the supporting area of the first scroll 4 can be made large, so that the first scroll 4 can be supported well.

Further, the thrust plate 9 has a first
Since the key groove 91 for engaging the Oldham key 82 of the Oldham ring 8 for preventing the rotation of the scroll 4 is formed,
The groove can be formed more easily than in the conventional case where the groove is formed in the fixing member.

Further, the inside of the casing 1 is divided into the first fixing member 3 and the second fixing member 6, and the compression element CF is arranged between the respective fixing members 3 and 6, and the compression element CF is compressed. The low pressure chamber 71 in which the suction pipe 14 for introducing the fluid into the element CF is opened, the first high pressure chamber 72 in which the discharge port 53 of the compression element CF is opened above the second fixing member 6, and the first high pressure chamber 72 is formed. Since the high-pressure gas in the first high-pressure chamber 72 is introduced below the fixing member 3 and the second high-pressure chamber 73 in which the external discharge pipe 15 is opened is defined, the compression element CF and the suction gas are heated by the high-pressure gas. Can be prevented.

Further, in order to support the second scroll 5 on the thrust plate 9 so as not to rotate, as in the second embodiment shown in FIG. 6, the end plate 51 of the second scroll 5 has the first embodiment. Similarly to the example, the mounting portions 56, 56 extending outward in the radial direction are formed, and the thrust plate 9 is formed.
Fitting portions 96, 96 for fitting the fitting portions 56, 56 are formed on the fitting portion 56, 56, and the fitting portions 56, 56 are fitted to the fitting portions 96, 9.
6, the pins 94a, 94a having a length that allows the second scroll 5 to move in the axial direction are passed through the mounting portions 56, 56, and then screwed to the thrust plate 9. You may

By doing so, while the second scroll 5 is prevented from rotating by the fitting portions 96, 96 of the thrust plate 9 and the pins 94a, 94a,
The pins 97, 97 also allow axial displacement. The rotation of the second scroll 5 is prevented by the fitting portion 9
You may make it perform only 6,96.

Although the thrust plate 9 is formed in a ring shape, it may be formed by two arc-shaped members.

Furthermore, in each of the above-described embodiments, the second scroll 5 is a fixed scroll, but it may be a co-rotating scroll that rotates with the rotation of the first scroll 4. In this case, the detent member is unnecessary.

[0054]

According to the invention described in claim 1, the compression chamber 1
By applying a pressing force that axially presses the rear surface of each end plate 41, 51 against the force acting on each scroll 4, 5 by the high pressure gas of 0, each spiral member 42, 52
While ensuring the sealability of the tooth tips of each spiral body 42, 5
When the central part of 2 is heated by the compressed gas and expands, and the pressing force acting on the back surface of the first scroll 4 becomes too large, this pressing force is not received by the fixed scroll as in the conventional case. Since it is received by the thrust plate 9 fixed to the first fixing member 3, the axial movement of the first scroll 4 can be prevented by the thrust plate 9, and the second scroll 5 is Since it is displaceable in the axial direction with respect to the second fixing member 6, each of the scrolls 42 and 52 is elongated by heating, and even if the central portion of the end plate 41 of the first scroll 4 bends inward in the axial direction. Since the second scroll 5 can be displaced in the separating direction, the spiral bodies 42, 52
It is possible to properly set the pressing force of the tooth tips to the end plates 41 and 51 in a wide operating range, and prevent damage due to burning of the spiral bodies 42 and 52.

According to the second aspect of the invention, between the outer peripheral portion of the end plate 51 of the second scroll 5 and the thrust plate 9, there is provided a detent member 94 for restricting the rotation of the second scroll 5. Since it is equipped, the second scroll 5
Using the thrust plate 9, it can be supported so as to be displaceable in the axial direction while also preventing rotation.

According to the third aspect of the invention, since the thrust plate 9 is formed of a ring member, the first plate is formed.
Since the supporting area of the scroll 4 can be made large, the first scroll 4 can be favorably supported.

According to the fourth aspect of the present invention, the thrust plate 9 is formed with the key groove 91 for engaging the Oldham key 82 of the Oldham ring 8 for preventing the rotation of the first scroll 4. The groove can be formed more easily than the fixing member.

According to the fifth aspect of the present invention, the first fixing member 3 supporting the first scroll 4 and the second scroll 5 can be displaced in the casing 1 in the axial direction, and can move in the radial direction. A low pressure chamber 71 in which a suction pipe 14 for introducing a fluid into the compression element CF, which is arranged between the second fixing member 6 for restricting the pressure, is opened, and a first high pressure in which a discharge port 53 of the compression element CF is opened. Since the chamber 72 and the high-pressure gas in the first high-pressure chamber 72 are introduced and partitioned into the second high-pressure chamber 73 in which the external discharge pipe 15 is opened, the compression element CF and the suction gas are prevented from being heated by the high-pressure gas. You can do it.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing a first embodiment of a scroll compressor according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 seen from the upper side of the casing excluding the second scroll.

FIG. 3 is an upper sectional view of the compressor taken along the line BB in FIG.

FIG. 4 is a cross-sectional view of the casing taken along the line C-C of FIG. 1 as seen from the upper side.

FIG. 5 is an explanatory view showing the assembling of the second scroll to the thrust plate and the assembling of the thrust plate to the fixing member.

FIG. 6 is an explanatory diagram showing the assembly of the second scroll to the thrust plate in the second embodiment.

FIG. 7 is a cross-sectional view of a compression element of a conventional scroll compressor.

[Explanation of reference numerals] 1 casing 6 second fixing member 14 suction pipe 71 low pressure chamber 15 external discharge pipe 72 first high pressure chamber 2 drive shaft 73 second high pressure chamber 3 first fixing member 8 Oldham ring 4 first scroll (movable scroll ) 81,8
2 Oldham key 41 End plate 9 Thrust plate 42 Swirl body 91 Oldham key groove 5 Second scroll (fixed scroll) 94 Whirl stop member 51 End plate M motor 52 Swirl body CF Compression element 53 Discharge port

Claims (5)

[Claims] 1. A casing (1) comprising a first scroll (4) having a scroll (42) projecting from a mirror plate (41) and a second scroll having a scroll (52) projecting from a mirror plate (51). (5) and the scroll element (42) of the first scroll (4) and the scroll body (52) of the second scroll (5) are meshed with each other to form a compression chamber (10) ( CF) is internally provided, and high pressure is applied to the back side of the end plates (41) (51) of the first scroll (4) and the second scroll (5) to axially move each scroll (4) (5). In the pressed scroll type compressor, the first scroll (4) is connected to the drive shaft (2) of the motor (M), and the first scroll (4) is supported by the first fixing member (3). The second scroll (5) is moved in the radial direction by the second fixing member (6). While restricting the movement, the second fixing member (6) can be displaced in the axial direction, while the end plate (4) of the first scroll (4) is provided.
1) The outer circumference of the end plate (41) of the first scroll (4) fixed to the first fixing member (3) between the outer circumference of the end plate (51) of the second scroll (5). A scroll type compressor characterized in that a thrust plate (9) that abuts on the section is arranged. 2. The second scroll is provided between the outer peripheral portion of the end plate (51) of the second scroll (5) and the thrust plate (9).
Anti-rotation member (9 for restricting rotation of the scroll (5)
4. The scroll compressor according to claim 1, wherein 4) is interposed. 3. The scroll compressor according to claim 1, wherein the thrust plate (9) is a ring member. 4. The thrust plate (9) is formed with a key groove (91) for engaging an Oldham key (82) of an Oldham ring (8) for preventing rotation of the first scroll (4). The scroll compressor according to any one of claims 1 to 3. 5. A first fixing member (3) for supporting a first scroll (4) and a second scroll (5) are displaceable in an axial direction in a casing (1) for radial movement. A low pressure chamber (71) having an opening of a suction pipe (14) for introducing a fluid into the compression element (CF) arranged between the compression element (CF) and the second fixing member (6) that regulates the compression element (CF). Of the first high pressure chamber (72) in which the discharge port (53) is opened and the high pressure gas of the first high pressure chamber (72) is introduced into the second high pressure chamber (73) in which the external discharge pipe (15) is opened. The scroll compressor according to any one of claims 1 to 4, which is partitioned.