JPH08261188A - Horizontal scroll compressor - Google Patents

Abstract

PURPOSE: To relatively reduce a cost while enhancing reliability in a function as an overcompression avoiding mechanism. CONSTITUTION: In a horizontal scroll compressor of performing compression action toward the center from the periphery while forming a fluid pocket closed between both laps 1b, 2b by turning motion of a turn scroll 2, from a volute lap side end plate 2a of the turn scroll 2 of forming the fluid pocket of the compressor, one or a plurality of almost L-shaped through holes 4 are provided in a peripheral wall of a boss part 2c in an opposite side, and an overpressure release valve 5 is provided so as to close an outlet of the through hole 4 opened in the peripheral wall of the boss part 2c. This overpressure release valve 5 is formed by an almost C-shaped spring unit or by cylindrical elastic unit or by superposing the elastic unit on the spring unit, and when a pressure of the fluid pocket exceeds a preset value, by opening the overpressure release valve 5, a refrigerant is released before an abnormal pressure is generated by overcompression.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor suitable for air conditioning and refrigeration compressors, air compressors, etc.
In particular, it relates to an overcompression avoidance mechanism.

[0002]

2. Description of the Related Art In general, as a scroll compressor of this type, an automobile air conditioning compressor disclosed in Japanese Patent Publication No. 58-19875 is taken as an example, and its basic configuration and the like will be described with reference to FIGS. explain. FIG. 7 shows the structure of the main body of the open type scroll compressor. The structure for transmitting the driving force from the engine to the compressor body via the belt and the electromagnetic clutch has been omitted as a known fact.

The main parts that make up the compressor body are:
A fixed scroll 1 formed by forming an upright spiral wrap 1b on an end plate 1a, and an orbiting scroll formed by forming an upright spiral wrap 2b on an end plate 2a and engaging the wraps 1b and 2b inside each other. 2, a compressor housing 3 that forms the outer shell of the compressor body, a thrust bearing component arranged between the orbiting scroll end plate 2a and the compressor housing 3 in parallel with the orbiting scroll end plate 2a, and a ring as a rotation restraint component. Circular scroll side race 1
8, a orbiting scroll side ring 19, a ring-shaped housing side race 20, a housing side ring 21, a plurality of ball elements 23, and a drive mechanism for transmitting the orbiting motion to the orbiting scroll 2. The fixed scroll 1 has a projection 1c provided on the end plate 1a opposite to the wrap 1b.
And the compressor housing 3 are fastened together by bolts 6. An O-ring 10 is attached to the outer periphery of the end plate 1a between the end plate 1a and the compressor housing 3 and divides it into a high pressure chamber 11 on the side of the protrusion 1c and a low pressure chamber 12 on the side of the lap 1a.
Between the orbiting scroll end plate 2a and the compressor housing 3, the orbiting scroll end plate 2a covers the orbiting scroll end plate 2a so as to cover a ring-shaped orbiting scroll side race 18.
9 is attached to the ring-shaped race 20 on the housing side
Ring 21 on the housing side so that a slight gap is formed between the ring 21 and the ring 19 on the orbiting scroll side.
Is attached. The orbiting scroll side ring 19 and the housing side ring 21 are respectively provided with holes 22 that form a plurality of pockets having the same diameter in the axial direction, and a plurality of ball elements 23 are constantly held in the holes 22 to restrain rotation. However, the orbiting movement of the fixed scroll 1 is permitted, and the orbiting scroll 2 has a function as a thrust bearing component. The drive shaft 9 is a main ball bearing 15 and a sub ball bearing 1 mounted on the compressor housing 3.
It is rotatably supported via 7. The drive pin 9a at the end of the drive shaft 9 on the side of the orbiting scroll 2 is connected to the orbiting bush 8, and the orbiting bush 8 is provided on a cylindrical boss portion 2c formed on the rear surface of the orbiting scroll end plate 2a. It is inserted in the swivel bearing 7. With this configuration, the orbiting scroll 2 can include a drive mechanism that causes the fixed scroll 1 to orbit. A suction port 13 for sucking a refrigerant as a working fluid is provided on the low pressure chamber 12 side of the compressor housing 3, and a discharge port 14 for discharging the refrigerant is provided on the high pressure chamber 11 side.

The orbiting scroll 2 is a fixed scroll 1.
On the other hand, when the swirling motion is started and the compression stroke is started, the refrigerant is taken into the low pressure chamber 12 in the compressor housing 3 through the suction port 13. Next, the fluid pocket 16 of the closed space formed by the fixed scroll end plate 1a and its spiral wrap 1b, and the orbiting scroll end plate 2a and its spiral wrap 2b.
And is compressed from the outermost peripheral portions of both laps 1b, 2b toward the central portion. The compressed refrigerant gas is discharged into the high pressure chamber 11 through the discharge gas hole 1d at the center of the fixed scroll end plate 1a, and further discharged from the discharge port 14 to the outside.

[0005]

In the conventional scroll compressor shown in FIG. 7, the closed space in which the refrigerant is blocked between the fixed scroll 1 and the orbiting scroll 2 by the orbiting motion of the orbiting scroll 2 is eliminated. It is sent to the fluid pocket 16, compressed from the outermost peripheral portions of both wraps toward the central portion, passes through the high pressure chamber 11, and is discharged to the outside from the discharge port 14. During this compression stroke, the refrigerant taken into the fluid pocket 16 is not always in a uniform gas state. The refrigerant remaining in the compressor housing is sometimes in a liquid state. Similarly, the refrigerant sucked into the low-pressure chamber 12 through the suction port 13 is not always in a gas state, but is often sucked in a liquid state and taken into the fluid pocket 16 as it is. When the liquid refrigerant is taken into the fluid pocket 16 and the compression action is started in this way, the liquid refrigerant in the fluid pocket 16 rapidly changes into a gas state and tries to expand the volume greatly, thereby causing the fluid pocket 16 to expand. The pressure inside rises significantly. However once fluid pocket 1
As long as the orbital movement of the orbiting scroll 2 is not stopped, the refrigerant clogged in 6 is generated by the centrifugal force generated by the orbiting movement of the orbiting scroll 2 and the action force of the compressed refrigerant, etc.
The function of enhancing the degree of sealing of 6 acts and cannot leak out of the fluid pocket 16. The higher the pressure in the fluid pocket 16, the stronger this tendency. Therefore, when the compression stroke of the liquid refrigerant starts in the fluid pocket 16, an abnormal pressure far exceeding the set pressure occurs, and the wrap 1 of at least one of the fixed scroll 1 and the orbiting scroll 2 is generated.
There is a problem that b and 2b are damaged, and the sliding portion of the orbiting scroll 2 is abnormally worn and damaged.

The object of the present invention has been made in view of the problem in the conventional scroll compressor shown in FIG. 7, in which the end plate on the opposite side from the end plate on the spiral wrap side of the orbiting scroll forming the fluid pocket is provided. In the outer peripheral wall of the cylindrical boss portion, one or a plurality of substantially L-shaped through holes are provided,
By providing the overpressure release valve to close the outlet of the through hole opened on the outer peripheral wall of the boss, the lap and the orbiting scroll are damaged or the sliding part is caused by the abnormal pressure due to the compression of the liquid refrigerant in the fluid pocket. An object of the present invention is to provide a horizontal scroll compressor that solves the problem of causing abnormal wear and the like.

[0007]

To achieve the above object, a scroll compressor according to the present invention comprises a fixed scroll having an end plate and an upright spiral wrap inside the compressor housing, and the end plate and the upright scroll. Orbiting scroll having wrapping spiral wraps, which are arranged in mesh with the fixed scroll with the wraps inside each other, and a cylindrical boss portion formed on the end surface of the end plate opposite to the spiral wrap of the orbiting scroll. And a drive shaft rotatably supported by the compressor housing, and a swivel bush inserted into the swivel bearing that gives a swivel motion to the orbiting scroll by a driving force from the drive shaft.
A rotation restraint component that restrains only the rotation of the orbiting scroll by rotating it and forms a fluid pocket closed between the both wraps by the orbiting motion of the orbiting scroll, while exerting a compression action from the outer circumference of the both wraps to the center. In the horizontal scroll compressor to be performed, one or a plurality of substantially L-shaped through holes are formed in the outer peripheral wall of the boss portion on the opposite side from the end plate on the spiral wrap side of the orbiting scroll forming the fluid pocket. And an overpressure release valve for closing the outlet of the through hole opened in the outer peripheral wall of the boss portion,
The overpressure release valve is substantially C along the outer circumference of the cylindrical boss portion.
Formed of a spring body having the shape of, or formed of an elastic body having the shape of a cylinder, or formed by covering a spring body having the shape of approximately C with a cylindrical elastic body. When the pressure in the fluid pocket exceeds a set value, the overpressure release valve opens.

[0008]

According to the present invention, one or a plurality of substantially L-shaped through holes are provided in the outer peripheral wall of the boss portion on the opposite side from the end plate on the spiral wrap side of the orbiting scroll forming the fluid pocket, and the boss is formed. Is provided with an overpressure release valve so as to close the outlet of a through hole opened in the outer peripheral wall of the portion, and the overpressure release valve is formed of a spring body having a substantially C shape along the outer periphery of the cylindrical boss portion, Alternatively, when the pressure of the fluid pocket exceeds the set value, the overpressure release valve is formed by overlapping the cylindrical elastic body or the spring body having a substantially C shape with the cylindrical elastic body. By opening it, the problem that the refrigerant with abnormal pressure generated in the fluid pocket is discharged to the low pressure chamber and the pressure in the fluid pocket is lowered, causing damage to the lap and orbiting scroll and abnormal wear of sliding parts, etc. is solved. It

[0009]

Embodiments of the present invention will be described in detail below with reference to FIGS.

1 to 4 show an embodiment of the present invention, in which a compressor housing 3, a fixed scroll 1, an orbiting scroll 2 and a compressor main body such as a drive shaft, a thrust bearing part and a rotation restraint part are shown. The positional relationship of the main parts constituting the same is the same as that shown in FIG. 7 of the conventional example. That is, a fixed scroll 1 having an end plate 1a and a spiral wrap 1b standing upright on the end plate 1a inside the compressor housing 3, and an end plate 2
a and a scroll-like wrap 2b that is upright on the end plate 2a, and the wraps 1b and 2b are inside each other and the fixed scroll 1
The orbiting scroll 2 is arranged so as to mesh with. End plate 2 on the side opposite to the spiral wrap 2a of the orbiting scroll 2
A cylindrical boss portion 2c is formed on the back surface of b, and a swivel bearing 7 is provided on the boss portion 2c. The drive shaft 9 is rotatably supported by a main ball bearing 15 and a sub ball bearing 17 attached to the compressor housing 3. The drive pin 9a at the end of the drive shaft 9 on the side of the orbiting scroll 2 is connected to the orbiting bush 8 inserted in the orbiting bearing 7, and the drive force from the drive shaft 9 imparts orbiting motion to the orbiting scroll 2. ing. A ring-shaped orbiting scroll side race 18 is provided between the orbiting scroll end plate 2a and the compressor housing 3.
The orbiting scroll side ring 19 is attached to the orbiting scroll end plate 2a so as to cover the ring-shaped housing side race 20, and a small gap is formed between the orbiting scroll side ring 19 and the orbiting scroll side ring 19. The side ring 21 is attached. The orbiting scroll side ring 19 and the housing side ring 21 are respectively provided with holes 22 that form a plurality of pockets having the same diameter in the axial direction, and a plurality of ball elements 23 are constantly held in the holes 22 to restrain rotation. However, the orbiting movement of the fixed scroll 1 is permitted, and the orbiting scroll 2 has a function as a thrust bearing component.

The fluid pocket 1 closed between the wraps 1b, 2b by the orbiting motion of the orbiting scroll 2.
Reference numeral 6 compresses the refrigerant gas while reducing the volume from the outer periphery of the both wraps 1b, 2b toward the center. From the end plate 2a on the spiral wrap 2b side of the orbiting scroll 2 forming the fluid pocket 16 to the cylindrical boss portion 2c on the opposite side.
The outer peripheral wall 2d is provided with one or a plurality of substantially L-shaped through holes 4. Then, the overpressure release valve 5 of the substantially C-shaped spring body 5a along the outer periphery of the cylindrical boss portion 2c is provided so as to close the outlet 4a of the through hole 4 formed in the outer peripheral wall 2d of the boss portion 2c. It is installed. An example in which a stopper 5b is attached to prevent the spring body 5a from coming off is shown in FIG.
It is shown in (c). The pressure of the refrigerant gas in the fluid pocket 16 is set by the pressing force of the spring body 5a. When the pressure exceeds the set value, the spring body 5a opens and the fluid pocket 16
The refrigerant can be discharged to the low pressure chamber 12 from the outlet 4a through the through hole 4.

In the second and third embodiments shown in FIGS. 5 to 6, the mechanism of the overpressure prevention valve 5 is a cylindrical boss portion 2c instead of the substantially C-shaped spring body 5a. The elastic body 5c is made of rubber and has a cylindrical shape along the outer circumference, and the elastic body 5c having a substantially C shape is covered with the cylindrical elastic body 5c. In either case, when the pressure in the fluid pocket 16 rises and exceeds the set value, the spring body 5a or the elastic body 5c opens and the fluid pocket 1
The refrigerant 6 can pass through the through hole 4 and be discharged to the low pressure chamber 12 through the outlet 4a.

[0013]

Since the present invention is configured as described above, if the pressure of the refrigerant in the fluid pocket closed between the laps rises abnormally and exceeds the set value of the overpressure release valve, the overpressure is generated. The discharge valve opens, the refrigerant in the fluid pocket passes through the through hole,
By discharging the refrigerant from the outlet to the low pressure chamber, the pressure of the refrigerant in the fluid pocket can be reduced. Moreover, the position of the through hole can be relatively freely provided on the circumference of the orbiting scroll end plate occupied by the cylindrical boss portion, and the through hole is almost the same as the two fluid pockets are symmetrical. It is also possible to provide in symmetrical positions. With this configuration, problems such as lap damage due to overcompression and orbiting scroll damage can be solved without incurring processing costs, and stable operation is possible.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor as an embodiment of the present invention.

FIG. 2 is a sectional view of the orbiting scroll.

FIG. 3 is a plan view of the orbiting scroll.

FIG. 4 (a) is an exploded view of an overpressure release valve comprising a spring body having a substantially C-shape as an embodiment of the present invention (b) is an assembly view thereof (c) is a stopper and the spring body is shown. Illustration of fixed overpressure release valve

FIG. 5A is an assembly diagram of an overpressure release valve made of an elastic body having a cylindrical shape as a second embodiment, and FIG.

FIG. 6 is an assembly diagram of an overpressure release valve in which an elastic body is superposed on a spring body as a third embodiment.

FIG. 7 is a sectional view of a scroll compressor as a conventional example.

FIG. 8 is a structural development view of main parts of a conventional machine

FIG. 9 (a) is a compression stroke diagram according to the orbiting angle of each wrap of a fixed scroll and an orbiting scroll (b) is a compression stroke diagram according to the orbiting angle of each wrap of a fixed scroll and an orbiting scroll (c) is a fixed scroll And the orbiting scroll's compression stroke diagrams depending on the orbiting angle of each wrap (d) is the compression stroke diagram according to the orbiting angle of each wrap of the fixed scroll and the orbiting scroll (e) is the orbiting angle of each wrap of the fixed scroll and the orbiting scroll Compression stroke diagram by (f) is the compression stroke diagram by the wrapping angle of each wrap of the fixed scroll and orbiting scroll (g) is the compression stroke diagram by the wrapping angle of each wrap of the fixed scroll and the orbiting scroll (h) is the fixed scroll Stroke depending on the turning angle of each lap of the scroll and orbiting scroll Figure

[Explanation of symbols]

 1 Fixed Scroll 1a Fixed Scroll End Plate 1b Fixed Scroll Wrap 1c Protrusion 1d Discharge Gas Hole 2 Orbiting Scroll 2a Orbiting Scroll End Plate 2b Orbiting Scroll Wrap 2c Boss 2d Boss Outer Wall 3 Compressor Housing 4 Through Hole 4a Through Hole Outlet 5 Overpressure prevention valve 5a Spring body 5b Stopper 5c Elastic body 6 Bolt 7 Slewing bearing 8 Slewing bush 9 Drive shaft 9a Drive pin 10 O-ring 11 High pressure chamber 12 Low pressure chamber 13 Suction port 14 Discharge port 15 Main ball bearing 16 Fluid Pocket 17 Secondary ball bearing 18 Orbiting scroll side race 19 Orbiting scroll side ring 20 Housing side race 21 Housing side ring 22 Hole 23 Multiple ball elements

Front page continuation (72) Inventor Masahiko Makino 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A compressor housing has a fixed scroll having an end plate and a spiral wrap standing upright on the end plate, and a end plate and a spiral wrap standing upright on the end plate, wherein the wraps are inside each other. An orbiting scroll arranged so as to mesh with the fixed scroll, an orbiting bearing provided on a cylindrical boss portion formed on the back face of the end plate opposite to the spiral wrap of the orbiting scroll, and rotatable on the compressor housing. A supported drive shaft, a orbiting bush inserted into the orbiting bearing for giving an orbiting motion to the orbiting scroll by a driving force from the driving shaft, and a rotation restraint component for restraining the rotation of the orbiting scroll to only turn. And compressing from the outer circumference of both wraps to the center while forming a fluid pocket closed between both wraps by the orbiting motion of the orbiting scroll. In the horizontal scroll compressor for use in the application, one or a plurality of substantially L shapes are formed on the outer peripheral wall of the boss portion on the opposite side from the end plate on the spiral wrap side of the orbiting scroll forming the fluid pocket. A through hole is provided, and an overpressure release valve is provided so as to close the outlet of the through hole opened in the outer peripheral wall of the boss portion. The overpressure release valve has a substantially C shape along the outer periphery of the cylindrical boss portion. A horizontal scroll compressor, characterized in that it is formed of a shaped spring body, and the overpressure release valve opens when the pressure in the fluid pocket exceeds a set value. 2. The horizontal scroll compressor according to claim 1, wherein the overpressure release valve comprises an elastic body having a cylindrical shape along the outer periphery of the cylindrical boss portion of the orbiting scroll end plate. 3. The overpressure release valve is formed of a spring body having a substantially C shape along the outer circumference of a cylindrical boss portion of the orbiting scroll end plate, and a cylindrical elastic body is covered thereon. The horizontal scroll compressor according to claim 1, wherein the scroll compressors are stacked.