JPH0893667A - Scroll compressor - Google Patents

Abstract

PURPOSE: To provide such a stable turning motion mechanism superior in compression efficiency that prevents gas leakage, seizure of a sliding part, and abnormal abrasion caused by swelling rotation of a turning scroll due to unbalance of pressure, just after starting operation of the scroll compressor. CONSTITUTION: A penetration part for inserting a bolt into a fixed scroll and an insertion hole for a fixed pin are formed and a screw hole for a bolt and a fixed pin are formed in a bearing in such a scroll compressor that a compression part 2 and an electric motor 3 are arranged in the upper and lower parts of a sealed container 1 respectively, and the compression part 2 comprises a spiral fixed scroll 4, a tuning scroll 5 for forming the fixed scroll 4 and a plurality of compression chambers 9, a shaft 10 pivotally supporting a turning drive shaft 5c and forming a crankshaft on its upper end so as to rotationally drive, and a bearing 7 for journalling the crankshaft 11. And a leaf spring 6 having transparent holes for bolts 8 in its both ends is provided and the fixed scroll is elastically supported between the leaf spring and the bearing by the bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a structure for preventing unstable motion of an orbiting scroll.

[0002]

2. Description of the Related Art A conventional scroll compressor will be described with reference to FIG. 7 which is a vertical sectional view thereof and FIG. 8 which is an enlarged sectional view of an essential part thereof. Scroll compressor, sealed container 1
The compression unit 2 and the electric motor 3 are incorporated therein. The compression unit 2 is mainly composed of a fixed scroll 4, an orbiting scroll 5, an Oldham ring 12, a crankshaft 11, an eccentric bearing 13, a bearing 7, and a shaft 10. In this configuration,
A fixed scroll wrap 4b having a spiral shape is integrally formed on the fixed end plate 4a, a fixed scroll fixed to a bearing, a fixed scroll wrap 5b having a spiral shape on the orbiting end plate 5a, and an orbiting drive shaft 5c are integrally formed on the back surface. A plurality of compression chambers 9 are formed by meshing the orbiting scroll with the scroll wrap inside. When the electric motor rotates, the orbiting drive shaft makes an orbiting scroll through the eccentric bearing fitted to the crankshaft formed on the upper part of the shaft attached to the bearing,
The Oldham ring makes a turning motion while preventing rotation. The low-pressure refrigerant sucked from the suction pipe 15 into the compression section by the orbiting motion of the orbiting scroll is compressed while moving sequentially from the outer peripheral portion of the compression chamber to the central portion, and becomes high-pressure refrigerant, and from the discharge port 14 to the discharge chamber 16, the communication passage 18, And, it is sent out of the machine from the discharge pipe 19 through the space 17 between the compression unit and the electric motor. In addition, the refrigerant pressure that has risen in the center of the compression chamber exerts a separating force that pushes down the orbiting scroll 5, causing a gap between the fixed end plate 4a and the orbiting scroll wrap 5b and between the orbiting end plate 5a and the fixed scroll wrap 4b to prevent gas leakage. In order to prevent the compression efficiency from lowering, a high-pressure refrigerant is introduced between the central portion of the rear surface of the swivel end plate 5a and the upper surface of the crankshaft to provide the high-pressure portion 20, and the pushing force by the high-pressure refrigerant is used to counter the detaching force. The airtightness of the compression chamber is maintained. However, at the start of the operation when the refrigerant pressures on the suction side and the discharge side are almost equal, the pressure in the compression chamber rises first, and then the pressure in the sealed container rises from the discharge chamber, so the pressure balance inside the fuselage is not balanced. . At this time, as shown in FIG. 8, the orbiting force transmitted from the crankshaft acting on the orbiting drive shaft is divided into a force rotating in a direction orthogonal to the force pressing the orbiting scroll lap in the orbiting radial direction, and this pressing force is applied. The reaction point of the force becomes the orbiting scroll wrap that constitutes the compression chamber, and the action point (rightward arrow) and the reaction point (leftward arrow) are separated in the axial direction of the orbiting drive shaft, so a twisting moment acts on the orbiting end plate and causes tilting. It will be. For this reason, there is a problem that waviness rotation occurs in the swivel end plate, gas leakage occurs in the compression chamber, and compression efficiency decreases, and at the same time, abnormal sliding occurs in each sliding part, causing seizure and abnormal wear. It was

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. A scroll which improves the stable operation performance and reliability by a mechanism for stabilizing the orbiting motion of the orbiting scroll. To provide a compressor.

[0004]

In order to achieve the above object, a compression part and an electric motor are arranged vertically in a hermetically sealed container, and the compression part meshes with a spiral fixed scroll and the fixed scroll. An orbiting scroll that collectively forms a plurality of compression chambers, and a shaft that supports the orbiting drive shaft of the orbiting scroll and forms a crankshaft at the upper end to orbitally drive the orbiting scroll,
In a scroll compressor configured with a bearing that axially supports the crankshaft, a penetrating portion that inserts a bolt in an outer peripheral portion of the fixed scroll, and an insertion hole that inserts a fixing pin are formed, and the bearing, A screw spring of a bolt corresponding to a through portion of the fixed scroll and a fixing pin penetrating the insertion hole are formed, and a plate spring having a through hole of the bolt corresponding to the screw hole of the bolt is provided. By inserting the fixing pin of the bearing into the through hole of, the bolt is inserted into the through hole of the leaf spring and the penetrating portion of the fixed scroll, and the bolt is fixed to the screw hole of the bearing, The fixed scroll is elastically supported between a leaf spring and the bearing. Also,
As the penetrating portion, four concave portions are formed at equal intervals. Alternatively, it is characterized in that four through holes are formed at equal intervals as the through portions. The fixing pin is provided at a substantially central position of the adjacent penetrating portions. Further, the leaf spring is substantially plate-shaped, and through holes are formed at both ends. A pair of the leaf springs are arranged in parallel along the outer peripheral portion of the fixed scroll. Alternatively, it is characterized in that two pairs of the leaf springs are used and are arranged in a substantially square shape along the outer peripheral portion of the fixed scroll. Alternatively, the shape of the leaf spring is annular.

[0005]

According to the above construction, the compression part and the electric motor are arranged vertically in the sealed container, and the compression part is engaged with the spiral scroll and the fixed scroll to form a plurality of compression chambers. In the scroll compressor, the orbiting scroll to be formed, a shaft for orbiting and driving the orbiting drive shaft of the orbiting scroll and forming a crankshaft at the upper end, and a bearing for pivotally supporting the crankshaft, A through portion for inserting a bolt into the outer peripheral portion of the fixed scroll and an insertion hole for inserting a fixing pin are formed, and the bearing has a screw hole for a bolt corresponding to the through portion of the fixed scroll.
A fixing pin penetrating the insertion hole is formed, and a leaf spring having a bolt through hole corresponding to the screw hole of the bolt is provided, and the fixing pin of the bearing is inserted into the insertion hole of the fixed scroll. The fixed scroll is elastically supported between the leaf spring and the bearing by inserting the bolt into the through hole of the leaf spring and the penetrating portion of the fixed scroll and fixing the bolt in the screw hole of the bearing. Further, as the penetrating portion, four concave portions are formed at equal intervals,
Alternatively, as the penetrating portions, four through holes are formed at equal intervals, and the fixing pins are respectively provided at substantially central positions of the adjacent penetrating portions, and the shape of the leaf spring is substantially plate-like. , Through holes at both ends, and the leaf spring,
A pair are arranged in parallel along the outer peripheral portion of the fixed scroll, or two pairs of the leaf springs are used to be arranged in a substantially square shape along the outer peripheral portion of the fixed scroll,
Alternatively, since the leaf spring is configured to have an annular shape, the leaf spring exerts a pressing force for pressing the bearing to the fixed scroll, thereby stabilizing the orbiting movement of the orbiting scroll.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same parts as those in the conventional example are denoted by the same reference numerals. FIG. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention, which corresponds to CC ′ in FIG. 3, and FIG.
It is a principal part expanded sectional view. Compressed part 2 vertically inside the sealed container 1
And the electric motor 3, the fixed part 4 having a spiral shape, the orbiting scroll 5 meshing with the fixed scroll to form a plurality of compression chambers 9, and the orbiting drive shaft 5c of the orbiting scroll. A scroll compressor is constituted by a shaft 10 which is formed by forming a crankshaft 11 at the upper end thereof and is driven to orbit, and a bearing 7 which pivotally supports the crankshaft. In this structure, a fixed scroll wrap 4b having a spiral shape is integrally formed on the fixed end plate 4a, the fixed scroll pressed against the bearing, the fixed scroll wrap 5b having a spiral shape on the orbiting end plate 5a, and the orbiting drive shaft 5c on the back surface. A plurality of compression chambers 9 are formed by meshing the orbiting scroll integrally formed with the scroll wrap inside.

Now, description will be made with reference to FIG. 3 which is a sectional view taken along the line AA 'in FIG. 2 and FIG. 4 which is a sectional view taken along the line BB' in FIG. A bolt 8 is attached to the outer periphery of the fixed scroll.
Through part 4e for inserting the fixing pin and the through hole 4e for inserting the fixing pin
and d. Further, a screw hole 7b of a bolt corresponding to a through portion of the fixed scroll and a fixing pin 7c penetrating the insertion hole are formed in the bearing. Then, a leaf spring 6 having a through hole 6a for the bolt is provided corresponding to the screw hole of the bolt. Here, the fixing pin of the bearing is inserted into the insertion hole of the fixed scroll, and the bolt is inserted into the through hole of the leaf spring and the penetrating portion of the fixed scroll, and the bolt is fixed to the screw hole of the bearing. By doing so, the fixed scroll is elastically supported between the leaf spring and the bearing.

As a result, the leaf spring exerts a pressing force that presses the pressure contact surface 4c of the fixed scroll against the pressure contact surface 7a of the bearing. Therefore, the pressing force acts to press the orbiting scroll against the fixed scroll, and the orbiting scroll is overturned. It is possible to counter the moment that acts and prevent the force from becoming excessive. In addition, in one embodiment of the present invention shown in FIG. 3, four through-holes are formed at equal intervals, the leaf spring is formed into a substantially plate-like shape, and through holes are formed at both ends. A pair is arranged in parallel along the section. Then, as shown in FIG. 4, the fixing pins are provided at substantially central positions of the leaf springs. Alternatively, as shown in FIG. 5, two pairs of the leaf springs may be used and arranged so as to form a substantially square shape along the outer peripheral portion of the fixed scroll.
Alternatively, as shown in FIG. 6, an annular leaf spring may be used. Further, although not shown in the drawing, the through portion may be formed as a through hole corresponding to the bolt.

[0009]

As described above, in the present invention, the compression section and the electric motor are arranged vertically in the sealed container, and the compression section is
A spiral fixed scroll, an orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers, and a shaft that supports the orbital drive shaft of the orbiting scroll and forms a crankshaft at the upper end for orbital drive. In a scroll compressor configured with a bearing that pivotally supports the crankshaft, a through portion through which a bolt is inserted and an insertion hole through which a fixing pin is inserted are formed on an outer peripheral portion of the fixed scroll,
In the bearing, a screw hole of a bolt corresponding to a penetrating portion of the fixed scroll and a fixing pin penetrating the insertion hole are formed, and a leaf spring having a through hole of the bolt corresponding to the screw hole of the bolt is provided. , Inserting the fixing pin of the bearing into the insertion hole of the fixed scroll, inserting the bolt into the through hole of the leaf spring and the penetrating portion of the fixed scroll, and fixing the bolt to the screw hole of the bearing. As a result, the fixed scroll is elastically supported between the leaf spring and the bearing, and four recesses are formed at equal intervals as the penetrating portions, or four recesses are formed at equal intervals as the penetrating portions. Individual through holes are formed, and the fixing pins are respectively provided at substantially central positions of the adjacent through portions, and the leaf spring is formed into a substantially plate shape, and through holes are formed at both ends, and The leaf spring A pair is arranged in parallel along the outer peripheral portion of the fixed scroll, or two pairs of the leaf springs are used so as to be arranged in a substantially square shape along the outer peripheral portion of the fixed scroll, or the shape of the leaf spring. Since it has a ring shape, the orbiting motion of the orbiting scroll can be stabilized, and as a result, the performance and efficiency of the scroll compressor can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention and corresponds to CC ′ in FIG.

FIG. 2 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

3 is an enlarged cross-sectional view of a main part taken along the line AA ′ in FIG.

FIG. 4 is an enlarged cross-sectional view of a main part taken along BB ′ of FIG.

FIG. 5 is an enlarged sectional view of a main part of a bearing showing a second embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a bearing showing a third embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of a scroll compressor showing an outline of a conventional example.

FIG. 8 is an enlarged cross-sectional view of a main part showing a state of stress at the start of operation of the orbiting scroll of the conventional example.

[Explanation of symbols]

 1 Sealed Container 2 Compressing Part 3 Electric Motor 4 Fixed Scroll 4a Fixed End Plate 4b Fixed Scroll Wrap 4c Pressing Surface 4d Insertion Hole 4e Penetration Part 5 Orbiting Scroll 5a Orbiting End Plate 5b Orbiting Scroll Wrap 5c Orbiting Drive Shaft 6 Leaf Spring 6a Through Hole 7 Bearing 7a Pressure contact surface 7b Screw hole 7c Fixing pin 8 Bolt 9 Compression chamber 10 Shaft 11 Crankshaft

Claims (8)

[Claims] 1. A compression unit and an electric motor are arranged above and below in a sealed container, and the compression unit is a spiral scroll and a orbiting scroll which meshes with the fixed scroll to form a plurality of compression chambers. A scroll compressor comprising a shaft for supporting the orbiting drive shaft of the orbiting scroll and forming a crankshaft at the upper end for orbiting, and a bearing for axially supporting the crankshaft, wherein an outer peripheral portion of the fixed scroll A through hole through which a bolt is inserted and an through hole through which a fixing pin is inserted, and a threaded hole of a bolt corresponding to the through hole of the fixed scroll and a fixing pin through the through hole are formed in the bearing. Then, a plate spring having a through hole of the bolt corresponding to the screw hole of the bolt is provided, and the fixing pin of the bearing is inserted into the insertion hole of the fixed scroll, and the plate bar is inserted. The bolt is inserted into the through hole of the fixed scroll and the through portion of the fixed scroll, and the bolt is fixed to the screw hole of the bearing, thereby elastically supporting the fixed scroll between the leaf spring and the bearing. A scroll compressor that is characterized by: 2. The scroll compressor according to claim 1, wherein four recesses are formed at equal intervals as the penetrating portions. 3. The scroll compressor according to claim 1, wherein the penetrating portion is formed with four penetrating holes at equal intervals. 4. The scroll compressor according to claim 1, wherein the fixing pins are respectively provided at substantially central positions of the adjacent penetrating portions. 5. The scroll compressor according to claim 2, wherein the leaf spring has a substantially plate shape, and through holes are formed at both ends. 6. The scroll compressor according to claim 5, wherein a pair of the leaf springs are arranged in parallel along an outer peripheral portion of the fixed scroll. 7. The scroll compressor according to claim 5, wherein two pairs of the leaf springs are arranged so as to form a substantially square shape along the outer peripheral portion of the fixed scroll. 8. The scroll compressor according to claim 1, wherein the leaf spring has an annular shape.