JPH11141469A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the contact by off-centering between laps of fixed and rotating scrolls and improve the transport strength resistance in a scroll compressor having a frame for engagingly locking a rotating scroll in such a manner as to be slidable locked to a sealed vessel by directly fixing the fixed scroll and the frame to the sealed vessel. SOLUTION: This scroll compressor comprises a compression mechanism part 2 having a fixed scroll 3 and a rotating scroll 4 housed in a sealed vessel 1. The fixed scroll 3 is fixed to a frame 5 by inserting a bolt 8 to the through- hole 3f of a flange part 3e and fastening it to the screw hole 5c of the flange part 5b of the frame 5. The rotating scroll 4 is regulated by an Oldham's ring 7 so as to be rotated to the fixed scroll 3. The butt surfaces 11 of the fixed scroll 3 and the frame 5 are spot-welded in a plurality of positions to form a weld nugget 12. Thus, the frame 5 and the fixed scroll 3 can be surely held by the sealed vessel, and the off-centering by a horizontal impact force can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric scroll compressor, and more particularly to a scroll compressor suitable for preventing a misalignment by welding and fixing a compression mechanism and an airtight container.

[0002]

2. Description of the Related Art As shown in FIG. 1 of Japanese Patent Application Laid-Open No. 64-32092, a scroll compressor of this type having low vibration and low noise characteristics is provided with a disk-shaped head plate and an integrated head plate. And a fixed scroll having a configuration similar to that of the spiral scroll and having a discharge port at the center of the end plate so that the side walls of the wrap are in contact with each other. , And these are accommodated in a cylindrical closed container having a suction port, the fixed scroll is fixed to the closed container, and the eccentric fitted to the orbiting scroll while preventing the orbiting scroll from rotating by a rotation preventing mechanism. By rotating a crankshaft having a portion with a motor, the orbital swirl around the center of the spiral of the fixed scroll wrap while maintaining the contact state of the side walls of the wraps of both scrolls. As the center of the spiral roll of wrap turns and drives the orbiting scroll.

In this conventionally known scroll compressor, a method of fixing a compression mechanism and a closed container is described in Japanese Patent Application Laid-Open No. 64-320.
Since it is not clear in Japanese Patent Publication No. 92, it will be described in detail with schematic structures shown in FIGS. In these figures, reference numeral 20 denotes a compression mechanism, reference numeral 21 denotes an orbiting scroll, 21a
Is a wrap of a revolving scroll, 21b is a boss, 21c is a bearing, 21d is a keyway, 22 is a fixed scroll, 22a is a fixed scroll wrap, 22b is a flange, 22c is a through hole, 23 is a frame, and 23a is a flange. Part, 23b is a screw hole, 23c is a main bearing, 23
d is a key groove, 23e is an outer periphery of a flange portion, 24 is a bolt, 25 is a crankshaft, 25a is an eccentric portion, 26 is an Oldham ring, 26a is a key of an Oldham ring, 27
Is an electric motor, 27a is a rotor, 27b is a stator, 27c is an air gap, 28 is an airtight container, 28a is an inner wall of the airtight container, 29 is a gap between the airtight container and the compression mechanism, and 30 is a spot welding nugget.

FIG. 3 is a side view of a conventional scroll compressor. As described above, the compression mechanism 20 includes a frame 23.
Crankshaft 25 inserted in main bearing 23c
Of the orbiting scroll 21 in which the bearing portion 21c provided on the boss portion 21b is fitted to the eccentric portion 25a of
and the fixed scroll 22 in which the wrap portion 22a is brought into contact with the fixed scroll 22 is arranged as shown in FIG.
The key 26a is engaged with the key groove 21d of the orbiting scroll 21 and the key groove 23d of the frame 23 to prevent the orbiting scroll 21 from rotating, and then a through hole formed in the flange portion 22b of the fixed scroll 22 is formed. 22c
Through a plurality of bolts 24 and screwed into a screw hole 23b provided in a flange portion 23a of the frame 23 to
The compression mechanism 20 is assembled by tightening 1a and 22a while centering and adjusting.

The rotor 27a of the electric motor 27 is attached to a crankshaft 25 extending below the compression mechanism 20. On the other hand, the stator 27b of the electric motor 27 is joined to an arbitrary position in the lower part of the sealed container 28. The above-described compression mechanism unit 20 and the sealed container 28 match the relative positions of the stator 27b and the rotor 27a in the height direction, and the radial direction is appropriately set between the inner periphery of the stator 27b and the outer periphery of the rotor 27a. The air gap 27c is maintained and arranged. The closed container 28 and the compression mechanism 20 are connected to the air gap 27c described above.
In order to be able to adjust the inner wall 28a of the closed container 28,
An appropriate gap 29 is provided between the compression mechanism 20 and the flange outer periphery 23e of the frame 23 constituting the compression mechanism 20, and the frame 23 is brought close to the compression mechanism 20. In this state, as shown in FIG.
A plurality of points are welded at a plurality of points from a direction perpendicular to the axis 0, and the nugget 30 is engaged between the closed container 28 and the frame 23.

[0006]

In the above prior art, the side surface of the frame of the compression mechanism is locked to the closed container by spot welding, and the air conditioner for home use such as the above-mentioned scroll compressor is used. The size of the product to be mounted on the fixed scroll is not sufficient because the size of the product is required to be smaller. For this reason, the size of the bolts that fasten the fixed scroll to the frame is restricted, and the use of small-diameter bolts is high.In a high-pressure container-type scroll compressor in which the pressure in the closed container becomes high, a high-rigidity, heavy-weight fixed scroll is used. Therefore, due to the impact from the direction perpendicular to the bolt tightening direction (hereinafter referred to as lateral impact), the inertia force due to the high weight causes the fixed scroll to move horizontally between the inner wall of the sealed container and the outer wall of the fixed scroll, or the bolt. There is a drawback that the displacement occurs within the range of the gap between the bolt and the fixed scroll. As a result, the wrap of the fixed scroll and the orbiting scroll forming the compression chamber in the compression mechanism collide with each other, resulting in a drawback that operation becomes impossible.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is excellent in impact resistance and suppresses contact due to misalignment between fixed and orbiting scroll wraps.
An object of the present invention is to provide a scroll compressor having improved transport resistance and high operating reliability.

[0008]

The above-mentioned object is attained as follows. The invention according to claim 1, wherein the fixed scroll and the orbiting scroll are engaged with each other in a spiral shape, and a frame that slidably locks the orbiting scroll is fixed to an airtight container. And both the frame and the frame are directly fixed to the closed container. Therefore, the impact resistance is improved as compared with the conventional example, and the misalignment between the fixed and orbiting scroll wraps is suppressed. According to a second aspect of the present invention, the fixed scroll and the orbiting scroll each comprising a head plate and a spiral wrap provided upright on the end plate are meshed with the wrap inside, and the fixed scroll and the frame are engaged with each other. The orbiting scroll is slidably locked inside the frame in a state where the end faces thereof are in contact with each other, and a compression mechanism portion having a compression chamber formed by fastening the fixed scroll to the frame with bolts is hermetically sealed. In a scroll compressor fixed to a container by spot welding,
Both the fixed scroll and the frame are simultaneously welded to the closed container from a direction perpendicular to the axis of the compression mechanism. According to such a configuration, since the fixed scroll and the frame, each of which is bolted, are welded and fixed to the sealed container, the respective positional relations do not shift even when subjected to an impact. As a result, a scroll compressor with improved impact resistance and high operation reliability can be obtained. According to a third aspect of the present invention, the position of the spot welding to the closed container is set as a contact portion between the horizontal end faces of the fixed scroll and the frame. Since the fixed scroll and the frame are fixed to the closed container by one point welding, the workability is improved. According to a fourth aspect of the present invention, each of the fixed scroll and the frame is provided with a position to be spot-welded to the closed container at a flange portion of the fixed scroll and the frame.
Since the fixed scroll, the frame, and the closed container are fixed to each other, since the fixed container is fixed to the closed container, impact resistance is improved. According to a fifth aspect of the present invention, the fixed scroll and the frame are fixed with bolts, and both the fixed scroll and the frame are fixed to the closed container. It is characterized by being locked. Therefore, the compression mechanism having the compression chamber formed by the fixed and the orbiting scroll is securely fixed to the closed container, the misalignment due to a lateral impact such as a drop is prevented, and the operation reliability is secured.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing one embodiment of a scroll compressor according to the present invention. In FIG. 1, reference numeral 1 denotes a closed container, 2 denotes a compression mechanism, 3 denotes a fixed scroll, 3a denotes a head plate, 3b denotes a wrap, 3c denotes a discharge port, 3d denotes a suction port, 3e denotes a flange, and 3f denotes a bolt through hole. , 4 is an orbiting scroll, 4a is a head plate, 4b is a wrap, 4c is a boss, 4d is a bearing, 5 is a frame, 5a is a main bearing, 5b is a flange portion, 5c is a screw hole, 6 is a crankshaft, and 6a is an eccentric portion. , 7 is an Oldham ring, 7a is an Oldham key, 8 is a bolt, 9 is an electric motor, 9a is a stator, 9b is a rotor, 9c is an air gap, 10 is a suction pipe, 11 is a contact surface between a fixed scroll and a frame, 12 Is a welding nugget.

As shown in FIG. 1, a compression mechanism 2 having a fixed scroll 3 and an orbiting scroll 4 is housed in an upper portion of a sealed container 1. The fixed scroll 3 and the orbiting scroll 4 are engaged with each other to form a compression chamber (closed space). The fixed scroll 3 is composed of a disk-shaped end plate 3a and a spiral wrap 3b standing upright, and has a discharge port 3c at the center and a suction port 3d at the outer periphery. The orbiting scroll 4 includes a disk-shaped end plate 4a, a wrap 4b formed upright on the end plate 4a and having the same shape as the wrap 3b of the fixed scroll 3, and a boss 4c formed on an opposite lap surface of the end plate 4a. . The frame 5 has a main bearing 5a at the center.
The main bearing 5a supports the crankshaft 6, and the eccentric portion 6a at the tip of the crankshaft 6 is rotatably inserted into the bearing 4d in the boss 4c.

The fixed scroll 3 is screwed into a screw hole 5c provided in a flange portion 5b of the frame 5 by passing a bolt 8 through a through hole 3f provided in a flange portion 3e. The orbiting scroll 4 is regulated by an Oldham ring 7 having an Oldham key 7 a so as to orbit without rotating on the fixed scroll 3. A suction pipe 10 is connected to a suction port 3 d of the fixed scroll 3, and a rotor 9 b of an electric motor 9 is connected to a lower end of the crankshaft 6.
Are attached by press fitting or the like, and the assembly of the compression mechanism 2 is completed. On the other hand, a stator 9a of the electric motor 9 is accommodated in a lower portion of the closed container 1 by shrink fitting or the like.

In the embodiment shown in FIG. 1, the closed casing 1 and the compression mechanism 2 have an appropriate air gap 9c between the stator 9a and the rotor 9b of the electric motor 9, and have a height direction. It is arranged so that the relative positions are coincident with each other, and a plurality of spot weldings are performed in the circumferential direction in such a manner that the fixed scroll 3 and the abutment surface 11 (hereinafter, referred to as an abutment surface) of the frame 5 coincide with each other.
The welding nugget 12 is formed in the compression mechanism 2 in a wedge shape. Thereby, both the fixed scroll 3 and the frame 5 are simultaneously fixed to the closed container 1 by one welding nugget 12.

FIG. 2 is a diagram showing another embodiment. A closed container 1 arranged in the same manner as that of FIG.
Each side of the frame 5 and the fixed scroll 3 of
This is also welded to a plurality of points in the same manner as in the conventional compressor, so as to surround the axis of the compression mechanism 2 vertically from outside of the closed vessel 1,
A welding nugget 12 is formed in each of them in a wedge shape, and the closed container 1 and the compression mechanism 2 are locked. In this example, the fixed scroll 3
And the frame 5 are fastened with bolts 8, and the fixed scroll 3 and the frame 5 are separately fixed to the closed container 1 by welding nuggets 12.

As described above, according to these embodiments, the misalignment of the conventionally known scroll compressor due to the lateral impact force due to the inertia of the high-rigidity and heavy-weight fixed scroll is achieved by sealing the two members of the frame 5 and the fixed scroll. By spot welding so as to surround the axis from the outside of the container and biting the nugget into a wedge shape, the frame and fixed scroll in the tightened state with bolts relatively weak against lateral slip are securely gripped in the closed container, The misalignment due to the lateral impact is greatly improved. That is, the contact due to the misalignment between the fixed and orbiting scroll wraps, which becomes incompressible, is achieved by fixing both the fixed scroll and the frame to the integrally formed airtight container, so that the fixed scroll and the fixed scroll seen in the prior art are fixed. It does not occur regardless of the gap on the inner wall of the closed container or the gap between the bolt outer diameter and the through hole. Therefore, the transport resistance of such a hermetic scroll compressor can be improved, and a product with high operation reliability can be supplied.

[0015]

According to the present invention, there is provided a scroll compressor which is excellent in impact resistance, suppresses contact due to misalignment between fixed and orbiting scroll wraps, improves transport strength, and has high operation reliability. can do.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view showing another embodiment of the scroll compressor according to the present invention.

FIG. 3 is a side sectional view showing an example of the structure of a conventionally known scroll compressor.

FIG. 4 is an A view of a conventionally known scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism part 3 Fixed scroll 3a End plate 3b Wrap 3c Discharge port 3d Inlet port 3e Flange part 3f Bolt through hole 4 Orbiting scroll 4a End plate 4b Lapping 4c Boss 4d Bearing 5 Frame 5a Main bearing 5b Flange part 5c Screw hole Crankshaft 6a Eccentric part 7 Oldham ring 7a Oldham key 8 Bolt 9 Electric motor 9a Stator 9b Rotor 9c Air gap 10 Suction pipe 11 Contact surface of both scrolls 12 Welding nugget

Claims (5)

[Claims] 1. A scroll compressor in which a spiral wrap of a fixed scroll and an orbiting scroll is engaged with each other and a frame for slidably locking the orbiting scroll is fixed to a closed container. A scroll compressor, wherein each of the frames is directly fixed to the closed container. 2. A fixed scroll and an orbiting scroll each comprising a head plate and a spiral wrap provided upright on the end plate are engaged with each other with the wrap inside, and the fixed scroll and an end face of a frame are engaged with each other. In the abutted state, the orbiting scroll is slidably locked inside the frame, and the compression mechanism portion, in which a compression chamber is formed by fastening the fixed scroll to the frame with a bolt, is spot-welded to the closed container. Wherein both the fixed scroll and the frame are simultaneously welded to the closed container from a direction perpendicular to the axis of the compression mechanism. . 3. The spot welding to the closed container is performed at a contact portion between horizontal ends of the fixed scroll and the frame, so that both the fixed scroll and the frame are simultaneously attached to the closed container. The scroll compressor according to claim 1, wherein the scroll compressor is fixed. 4. The fixed scroll and the frame are each fixed to the closed container by making the position of the spot welding to the closed container a flange portion of each of the fixed scroll and the frame. The scroll compressor according to claim 1 or 2, wherein: 5. The compression mechanism is locked in the closed container by fixing the fixed scroll and the frame with bolts and fixing both the fixed scroll and the frame to the closed container. The scroll compressor according to claim 1, wherein