JPH0874756A - Scroll compressor - Google Patents

Abstract

PURPOSE: To prevent a gas leakage, a seizure of a sliding part, and an abnormal abrasion, by a wavy rotation of a rotary scroll owing to the unbalance of the pressure, immediately after the starting of the operation of a scroll compressor. CONSTITUTION: In this scroll compressor, a compression member 2 and an electric motor 3 are provided vertically in a sealed container 1, and the compression member 2 is composed of a spiral form of fixed scroll 4; a rotary scroll 5 to form plural compression chambers 9 together with the fixed scroll 4; a shaft 10 to drive the rotation by supporting a rotary driving shaft 5c and forming a crankshaft at the upper end; and a bearing 7 to journal the crankshaft 11. And a penetrating member to insert a bolt, and a through hole for a fixing pin, are formed to the bearing, a screw hole for a bolt, and a fixing pin are formed to the fixed scroll 4, a leaf spring 6 having permeation holes of bolts 8 at both ends is provided, and a bearing is held elastically between the leaf spring 6 and the fixed scroll 4 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 from the outer peripheral portion to the central portion of the compression chamber to become a high-pressure refrigerant, from the discharge port 14 to the discharge chamber 16 and the communication passage 18. , And between the compression section and the electric motor 17, and is discharged from the discharge pipe 19 to the outside of the machine.
Further, due to the refrigerant pressure that has risen in the center of the compression chamber, a separating force that pushes down the orbiting scroll 5 acts, and the fixed end plate 4a
In order to prevent a gap from being formed between the orbiting scroll wrap 5b and the orbiting end plate 5a and the fixed scroll wrap 4b, gas leakage may occur and compression efficiency may be deteriorated. The high-pressure refrigerant is introduced to provide the high-pressure portion 20, and the pushing force of the high-pressure refrigerant opposes the separating force to maintain the airtightness of the compression chamber. 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 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 bearing,
The fixed scroll is provided with a screw hole of a bolt corresponding to a penetrating portion of the bearing and a fixing pin penetrating the insertion hole, and a plate spring having a through hole of the bolt corresponding to the screw hole of the bolt is provided. , The fixing pin of the fixed scroll is inserted into the insertion hole of the bearing, the bolt is inserted into the through hole of the leaf spring and the through portion of the bearing, and the bolt is fixed to the screw hole of the fixed scroll. Thus, the bearing is elastically supported between the leaf spring and the fixed scroll. Further, 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. The pair of leaf springs are arranged in parallel along the outer peripheral portion of the bearing. 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 bearing. 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 fixed 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 the orbiting drive shaft of the orbiting scroll and driving the orbit by forming a crankshaft at the upper end, and a bearing for pivotally supporting the crankshaft, A penetrating portion for inserting a bolt and an insertion hole for inserting a fixing pin are formed in the outer peripheral portion of the bearing, and a screw hole of a bolt corresponding to the penetrating portion of the bearing and the insertion hole are formed in the fixed scroll. A fixing spring is formed, and a plate spring having a bolt through hole corresponding to the screw hole of the bolt is provided, and the fixing pin of the fixed scroll is inserted into the insertion hole of the bearing, and the plate is formed. The bolt is inserted into the through hole of the shaft and the penetrating portion of the bearing, and the bolt is fixed to the screw hole of the fixed scroll to elastically support the bearing between the leaf spring and the fixed scroll. Further, as the penetrating portion, four concave portions are formed at equal intervals, or as the penetrating portion, four through holes are formed at equal intervals, and the fixing pin is formed on the adjacent penetrating portion. The leaf springs are provided at substantially central positions, and the leaf springs are formed into a substantially plate shape, through holes are formed at both ends, and a pair of leaf springs are arranged in parallel along the outer peripheral portion of the bearing, or , Two pairs of the leaf springs are arranged along the outer periphery of the bearing so as to have a substantially square shape, or the leaf springs are configured to have an annular shape. Push-up force that presses the bearing against the scroll Work, it is possible to stabilize the turning motion 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. Penetration part 7c which inserts bolt 8 in the peripheral part of the above-mentioned bearing, and insertion hole 7 which inserts a fixed pin for positioning.
and b. Further, the fixed scroll is formed with a screw hole 4d of a bolt corresponding to a penetrating portion of the bearing and a fixing pin 4e penetrating the insertion hole. Then, a leaf spring 6 having a through hole 6a for the bolt is provided corresponding to the screw hole of the bolt. Here, by inserting the fixing pin into the insertion hole of the bearing, inserting the bolt into the through hole of the leaf spring and the penetrating portion of the bearing, and fixing the bolt to the screw hole of the fixed scroll. The bearing is elastically supported between the leaf spring and the fixed scroll.

As a result, the leaf spring exerts a push-up force that presses the pressure contact surface 7a of the bearing against the pressure contact surface 4c of the fixed scroll, and as a result, it acts as a force to press the orbiting scroll against the fixed scroll, thereby overturning the orbiting scroll. 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 plate spring is formed into a substantially plate shape, and through holes are formed at both ends. A pair is arranged in parallel along with. Then, as shown in FIG. 4, the fixing pins are provided at substantially central positions of the leaf springs. Alternatively, as shown in FIG.
You may arrange | position so that it may become substantially square along the outer peripheral part of the said bearing using two said leaf springs. 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. A scroll compressor configured to include a bearing that pivotally supports the crankshaft, wherein a penetrating portion that inserts a bolt and an insertion hole that inserts a fixing pin are formed in an outer peripheral portion of the bearing, and , A screw hole of a bolt corresponding to a through portion of the bearing and a fixing pin penetrating the insertion hole, and a leaf spring having a through hole of the bolt corresponding to the screw hole of the bolt is provided, The fixing pin of the fixed scroll is inserted into the insertion hole, and the bolt is inserted into the through hole of the leaf spring and the penetrating portion of the bearing. By fixing in a hole, the bearing is elastically supported between the leaf spring and the fixed scroll, and as the penetrating portion, four concave portions are formed at equal intervals, or as the penetrating portion, Four through-holes are formed at equal intervals, and the fixing pins are respectively provided at substantially central positions of the adjacent through-holes. Further, the leaf spring is formed into a substantially plate-like shape, and through holes are formed at both ends. Then, a pair of the leaf springs are arranged in parallel along the outer peripheral portion of the bearing, or two pairs of the leaf springs are used so as to be formed in a substantially square shape along the outer peripheral portion of the bearing. Alternatively, since the leaf spring is configured to have an annular 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 Compressor 3 Electric Motor 4 Fixed Scroll 4a Fixed End Plate 4b Fixed Scroll Wrap 4c Pressure Contact Surface 4d Screw Hole 4e Fixing Pin 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 Insertion hole 7c Penetration part 8 Bolt 9 Compression chamber 10 Shaft 11 Crankshaft

Claims (8)

[Claims] 1. A compression unit and an electric motor are arranged vertically in a sealed container, and the compression unit includes a spiral scroll and a orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers. A scroll compressor which is configured to include a shaft that supports the orbiting drive shaft of the orbiting scroll and forms a crankshaft at the upper end to drive the orbit, and a bearing that axially supports the crankshaft. A through-hole for inserting the bolt and an insertion hole for inserting the fixing pin are formed, and a screw hole for the bolt corresponding to the through-hole of the bearing and a fixing pin for penetrating the inserting hole are formed on the fixed scroll. A plate spring having a bolt through hole corresponding to the screw hole of the bolt is provided, and the fixing pin of the fixed scroll is inserted into the through hole of the bearing, and the through hole of the plate spring is formed. The bearing is elastically supported between the leaf spring and the fixed scroll by inserting the bolt into the penetrating portion of the bearing and fixing the bolt in the screw hole of the fixed scroll. And scroll compressor. 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 bearing. 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 bearing. 8. The scroll compressor according to claim 1, wherein the leaf spring has an annular shape.