JP2006200488A - Scroll type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll type compressor less in the number of components and capable of smooth movement of a fixed scroll. <P>SOLUTION: This compressor is provided with: a fixed scroll having a spiral body; a movable scroll having a spiral body which forms a plurality of operation spaces by engaging with the spiral body of the fixed scroll; a main shaft; a turning drive mechanism for converting the main-shaft rotation into a turning motion to transmit to the movable scroll; a rotation-preventive mechanism of the movable scroll; and a pair of partial housings which form the spaces housing the fixed and movable scrolls, turning drive mechanism and rotation-preventive mechanism inside thereof. The fixed scroll is unable to relatively rotate and engages with the housing slidably in the directions of approaching to and separating from the movable scroll. Single coil spring having a diameter nearly equal to that of the end face of the fixed scroll is arranged inside a discharge chamber, and energizes the fixed scroll toward the movable scroll. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scroll compressor.

A fixed scroll having a spiral body, a movable scroll having a spiral body that meshes with the spiral body of the fixed scroll to form a plurality of working spaces, a main shaft, and a swing that converts the rotation of the main shaft into a swing motion and transmits it to the movable scroll A pair of a drive mechanism, a movable scroll rotation prevention mechanism, and a pair that are integrally joined in a state in which the end surfaces are in contact with each other, and that internally form a space that accommodates the fixed scroll, the movable scroll, the turning drive mechanism, and the rotation prevention mechanism. A fixed scroll that divides the internal space of the housing into a suction chamber and a discharge chamber, and a movable scroll, a main shaft, a turning drive mechanism, and an anti-rotation mechanism are accommodated in the suction chamber, and the fixed scroll is relatively rotated. It engages with the housing so that it can slide in the direction of moving away from the movable scroll. Scroll compressor in which a plurality of coil springs are disposed in the discharge chamber for urging the Le it is disclosed in Patent Document 1.
The surface pressure generated at the contact portion between the members in the rotation prevention mechanism and the contact portion between the scroll body of one scroll and the end plate of the other scroll due to variations in the dimensions of the component main shaft extending direction is the compressor. There is a possibility that the rotational torque characteristics vary from compressor to compressor. Conventionally, shims are inserted in contact portions between the end faces of the partial housings, and the thickness of the shim is finely adjusted to absorb the dimensional variation between components, thereby suppressing the variation in rotational torque characteristics. In the scroll compressor of Patent Document 1, when the fixed scroll that receives the urging force of the coil spring is moved closer to and away from the movable scroll, variations in dimensions between components are absorbed, and variations in rotational torque characteristics among the compressors. It is suppressed. Therefore, the shim inserted in the abutting portion between the end faces of the partial housing becomes unnecessary, and the assembly efficiency of the scroll compressor is improved.
JP 2000-320476 A

Since the scroll compressor of Patent Document 1 has a plurality of coil springs, it has a large number of parts, and variation in the spring constant of each coil spring causes variations in the urging force applied by each coil spring to the fixed scroll. There is a problem that the fixed scroll may not move smoothly.
The present invention has been made in view of the above problems, and includes a fixed scroll having a spiral body, a movable scroll having a spiral body that meshes with the spiral body of the fixed scroll to form a plurality of working spaces, a main shaft, and a main shaft. A turning drive mechanism that converts rotation into a turning motion and transmits it to the movable scroll, a rotation prevention mechanism of the movable scroll, and a fixed scroll, a movable scroll, and a turning drive mechanism that are integrally joined with the end surfaces in contact with each other. And a pair of partial housings that form a space for accommodating the rotation prevention mechanism, and the internal space of the housing is partitioned into a suction chamber and a discharge chamber by a fixed scroll, and the movable scroll, the main shaft, the turning drive mechanism, and the rotation prevention The mechanism is housed in the suction chamber, and the fixed scroll is non-rotatable and slidable in a direction approaching and separating from the movable scroll. Is a scroll compressor in which a coil spring for biasing the fixed scroll toward the movable scroll is disposed in the discharge chamber, and the number of components is smaller than that of the scroll compressor disclosed in Patent Document 1. An object of the present invention is to provide a scroll compressor in which the fixed scroll can be moved smoothly.

In order to solve the above problems, in the present invention, a fixed scroll having a spiral body, a movable scroll having a spiral body that meshes with the spiral body of the fixed scroll to form a plurality of working spaces, a main shaft, and a rotation of the main shaft The revolving drive mechanism that converts the motion into a revolving motion and transmits it to the movable scroll, the self-rotation preventing mechanism of the movable scroll, and the end surfaces are in contact with each other, and are joined together, and the fixed scroll, the movable scroll, the revolving drive mechanism, and the rotation are rotated. And a pair of partial housings that form a space for housing the prevention mechanism, and the internal space of the housing is partitioned into a suction chamber and a discharge chamber by a fixed scroll, and the movable scroll, the main shaft, the turning drive mechanism, and the rotation prevention mechanism Is housed in the suction chamber, and the fixed scroll is relatively non-rotatable and slidable in a direction approaching and separating from the movable scroll. A scroll that has a single coil spring disposed in the discharge chamber and biases the fixed scroll toward the movable scroll. provide.
In the scroll compressor according to the present invention, the number of components is smaller than that of the single scroll compressor disclosed in the patent document since the coil spring that biases the fixed scroll toward the movable scroll is single.
By making the coil spring substantially the same diameter as the end surface of the fixed scroll in contact with the discharge chamber, it is possible to apply a substantially uniform urging force to the entire fixed scroll, and to move the fixed scroll smoothly.

In a preferred aspect of the present invention, a key is fixed to the housing, a key groove is formed in the fixed scroll, and the key is slidably fitted in the key groove to prevent relative rotation of the fixed scroll with respect to the housing. In addition, the fixed scroll is guided in a direction approaching and separating from the movable scroll.
By engaging the key fixed to the housing with the key groove formed on the fixed scroll so as to be relatively slidable, the fixed scroll cannot be rotated relative to the movable scroll and can be slid in the direction of moving away from the movable scroll. Can be made.

In the scroll compressor according to the present invention, the number of components is smaller than that of the single scroll compressor disclosed in the patent document since the coil spring that biases the fixed scroll toward the movable scroll is single.
By making the coil spring substantially the same diameter as the end surface of the fixed scroll in contact with the discharge chamber, it is possible to apply a substantially uniform urging force to the entire fixed scroll, and to move the fixed scroll smoothly.

  A scroll compressor according to an embodiment of the present invention will be described.

As shown in FIG. 1, the scroll compressor according to this embodiment includes a fixed scroll 1 having an end plate 1a and a spiral body 1b, and a movable scroll 2 having an end plate 2a and a spiral body 2b. Yes. The fixed scroll 1 and the movable scroll 2 mesh with each other to form a plurality of pairs of working spaces 3.
The scroll compressor includes a casing 4a and a front housing 4b. The casing 4a and the front housing 4b are integrally joined in a state where the end surfaces are in contact with each other, and form a housing 4 that accommodates the fixed scroll 1 and the movable scroll 2. The internal space of the housing 4 is partitioned into a suction chamber 5 and a discharge chamber 6 by an end plate 1a of a fixed scroll.
A suction port (not shown) formed in the casing 4 a communicates with the suction chamber 5. The suction port is connected to the low pressure side of the external refrigerant circuit.
A discharge port (not shown) formed in the casing 4 a communicates with the discharge chamber 6. The discharge port is connected to the high pressure side of the external refrigerant circuit.

A main shaft 7 is disposed in the suction chamber 5. The main shaft 7 is rotatably supported by the front housing 4b via radial bearings 8 and 9. One end of the main shaft 7 protrudes outside the front housing 4b.
An electromagnetic clutch 10 is rotatably supported by the front housing 4b via a radial bearing 11.
An eccentric pin 12 is fixed to the other end of the main shaft 7. A bush 13 is slidably fitted to the eccentric pin 12. The bush 13 is accommodated in a boss 2 c formed on the back surface of the end plate 2 a of the movable scroll 2 via a radial bearing 14.
A ball coupling 15 is disposed between the movable scroll 2 and the front housing 4b.

  A discharge hole 16 is formed in the center of the end plate 1a of the fixed scroll. The discharge hole 16 communicates with the discharge chamber 6 via a discharge valve 17 attached to the end plate 1a.

As shown in FIG. 2, the end surface on the discharge chamber 6 side of the end plate 1a of the fixed scroll is offset to the discharge chamber 6 side relative to the peripheral portion 1c offset to the suction chamber 5 side and the peripheral portion 1c. And the central portion 1d. A plurality of notches 1e penetrating the end plate 1a in the thickness direction are formed on the outer peripheral edge of the peripheral edge portion 1c.
An annular step 4c is formed on the inner peripheral surface of the casing 4a. The portion of the casing 4a closer to the discharge chamber 6 than the annular step 4c is formed thicker than the portion closer to the suction chamber 5 than the annular step 4c.
The peripheral edge 1c of the end face of the end plate 1a on the discharge chamber 6 side faces the annular step 4c with a gap S therebetween.
A key 18 is press-fitted and fixed in the same number of recesses 4d as the notches 1e formed on the inner surface of a portion of the casing 4a that is close to the annular stepped portion 4c, thereby forming a part of the casing 4a. The key 18 is fitted in the notch 1e of the fixed scroll 1 so as to be capable of relative sliding. As a result of the peripheral edge portion 1c of the end face of the end plate 1a facing the discharge chamber 6 facing the annular stepped portion 4c with a gap S therebetween, the plurality of keys 18 are fitted into the plurality of notches 1e so as to be relatively slidable. Is engaged with the casing 4a so as not to be relatively rotatable and to be slidable in a direction approaching and separating from the movable scroll 2.
The peripheral side surface 1f of the end plate 1a that forms the boundary between the peripheral portion 1c and the central portion 1d of the end plate 1a on the discharge chamber 6 side end surface, the peripheral portion 1c of the end plate 1a on the discharge chamber 6 side end surface, and the casing 4a An O-ring 19 is provided in contact with the thick portion inner peripheral surface 4d. The end plate 1a and the O-ring 19 cooperate to form an airtight partition between the suction chamber 5 and the discharge chamber 6. Therefore, only the central portion 1d of the end face of the end plate 1a on the discharge chamber 6 side is in contact with the discharge chamber 6.
A coil spring 20 having substantially the same diameter as the central portion 1 d of the end surface of the end plate 1 a on the discharge chamber 6 side is disposed in the discharge chamber 6. The coil spring 20 biases the fixed scroll 1 toward the movable scroll 2.

In the scroll compressor according to this embodiment, the power of a drive source (not shown) is transmitted to one end of the main shaft 7 via the electromagnetic clutch 10, and the main shaft 7 is rotationally driven. With the rotation of the main shaft 7, the movable scroll 2 rotates and the refrigerant gas sucked into the suction chamber 5 through the suction port is taken into the working space 3. The ball coupling 15 prevents the movable scroll 2 from rotating.
The working space 3 moves toward the center of the fixed scroll 1 while reducing the volume, and the refrigerant gas in the working space 3 is compressed. The compressed refrigerant gas is discharged to the discharge chamber 6 through the discharge hole 16 and the discharge valve 17 formed in the end plate 1a of the fixed scroll 1, and to the high pressure side of the external refrigerant circuit through the discharge port (not shown). leak.

Due to variations in the dimensions of the main shaft 7 extending in the component parts, the surface pressure of the contact portion between the ball and the race of the ball coupling 15 or the contact portion between the spiral bodies 1b, 2b and the end plates 2a, 1a. May vary from compressor to compressor, and rotational torque characteristics may vary from compressor to compressor. In the scroll compressor according to the present embodiment, the fixed scroll 1 that has received the urging force of the coil spring 20 approaches and moves away from the movable scroll 2, thereby absorbing the variation in the dimension of the main shaft 7 extending direction of the component parts, Variations in the surface pressure of the contact portion between the ball and the race of the ball coupling 15 and the contact pressure between the spiral bodies 1b, 2b and the end plates 2a, 1a are suppressed from one compressor to another, and the rotational torque characteristics. Variation of each compressor is suppressed. Therefore, it is not necessary to insert a shim at the contact portion between the end surface of the casing 4a and the end surface of the front housing 4b.
In the scroll compressor according to the present embodiment, since the coil spring 20 that urges the fixed scroll 1 toward the movable scroll 2 is single, the number of parts is smaller than that of the single scroll compressor disclosed in Patent Document.
By making the coil spring 20 substantially the same diameter as the end surface 1d of the fixed scroll 1 in contact with the discharge chamber 6, it is possible to apply a substantially uniform urging force to the entire fixed scroll 1 and make the fixed scroll move smoothly. it can.

  The present invention is widely applicable to scroll type compressors.

It is sectional drawing of the scroll compressor which concerns on the Example of this invention. It is a block diagram of the scroll compressor which concerns on the Example of this invention. (A) is the elements on larger scale of FIG. 1, (b) is the figure which looked at the fixed scroll from the spiral body side, (c) is the figure which looked at the casing from the front housing side.

Explanation of symbols

1 fixed scroll 1a end plate 1b spiral body 2 movable scroll 2a end plate 2b spiral body 3 working space 4 housing 5 suction chamber 6 discharge chamber 19 O-ring 20 coil spring

Claims (2)

A fixed scroll having a spiral body, a movable scroll having a spiral body that meshes with the spiral body of the fixed scroll to form a plurality of working spaces, a main shaft, and a swing that converts the rotation of the main shaft into a swing motion and transmits it to the movable scroll A pair of a drive mechanism, a movable scroll rotation prevention mechanism, and a pair that are integrally joined in a state in which the end surfaces are in contact with each other, and that internally form a space that accommodates the fixed scroll, the movable scroll, the turning drive mechanism, and the rotation prevention mechanism. A fixed scroll that divides the internal space of the housing into a suction chamber and a discharge chamber, and a movable scroll, a main shaft, a turning drive mechanism, and an anti-rotation mechanism are accommodated in the suction chamber, and the fixed scroll is relatively rotated. A fixed scroll that is in contact with the discharge chamber and is engaged with the housing so as to be slidable toward and away from the movable scroll. Scroll compressor end surface substantially single coil spring having the same diameter of which is characterized in that urges the fixed scroll is disposed in the discharge chamber to the movable scroll. A key is fixed to the housing, a key groove is formed in the fixed scroll, and the key is fitted in the key groove so as to be relatively slidable to prevent relative rotation of the fixed scroll with respect to the housing, and the fixed scroll becomes a movable scroll. The scroll compressor according to claim 1, wherein the scroll compressor is guided in a direction of approaching and separating.

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